ISCSI.cpp@ 97271

Last change on this file since 97271 was 96407, checked in by vboxsync, 2 years ago
scm copyright and license note update
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 199.7 KB

Line
1	/* $Id: ISCSI.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* iSCSI initiator driver, VD backend.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_VD_ISCSI
33	#include <VBox/vd-plugin.h>
34	#include <VBox/err.h>
35
36	#include <VBox/log.h>
37	#include <iprt/alloc.h>
38	#include <iprt/assert.h>
39	#include <iprt/uuid.h>
40	#include <iprt/string.h>
41	#include <iprt/asm.h>
42	#include <iprt/thread.h>
43	#include <iprt/semaphore.h>
44	#include <iprt/md5.h>
45	#include <iprt/tcp.h>
46	#include <iprt/time.h>
47	#include <VBox/scsi.h>
48
49	#include "VDBackends.h"
50	#include "VDBackendsInline.h"
51
52
53	/*********************************************************************************************************************************
54	* Defined Constants And Macros *
55	*********************************************************************************************************************************/
56
57	/** The maximum number of release log entries per image. */
58	#define MAX_LOG_REL_ERRORS 1024
59
60	/** Default port number to use for iSCSI. */
61	#define ISCSI_DEFAULT_PORT 3260
62
63
64	/** Converts a number in the range of 0 - 15 into the corresponding hex char. */
65	#define NUM_2_HEX(b) ('0' + (b) + (((b) > 9) ? 39 : 0))
66	/** Converts a hex char into the corresponding number in the range 0-15. */
67	#define HEX_2_NUM(c) (((c) <= '9') ? ((c) - '0') : (((c - 'A' + 10) & 0xf)))
68	/* Converts a base64 char into the corresponding number in the range 0-63. */
69	#define B64_2_NUM(c) ((c >= 'A' && c <= 'Z') ? (c - 'A') : (c >= 'a' && c <= 'z') ? (c - 'a' + 26) : (c >= '0' && c <= '9') ? (c - '0' + 52) : (c == '+') ? 62 : (c == '/') ? 63 : -1)
70
71
72	/** Minimum CHAP_MD5 challenge length in bytes. */
73	#define CHAP_MD5_CHALLENGE_MIN 16
74	/** Maximum CHAP_MD5 challenge length in bytes. */
75	#define CHAP_MD5_CHALLENGE_MAX 24
76
77
78	/**
79	* SCSI peripheral device type. */
80	typedef enum SCSIDEVTYPE
81	{
82	/** direct-access device. */
83	SCSI_DEVTYPE_DISK = 0,
84	/** sequential-access device. */
85	SCSI_DEVTYPE_TAPE,
86	/** printer device. */
87	SCSI_DEVTYPE_PRINTER,
88	/** processor device. */
89	SCSI_DEVTYPE_PROCESSOR,
90	/** write-once device. */
91	SCSI_DEVTYPE_WORM,
92	/** CD/DVD device. */
93	SCSI_DEVTYPE_CDROM,
94	/** scanner device. */
95	SCSI_DEVTYPE_SCANNER,
96	/** optical memory device. */
97	SCSI_DEVTYPE_OPTICAL,
98	/** medium changer. */
99	SCSI_DEVTYPE_CHANGER,
100	/** communications device. */
101	SCSI_DEVTYPE_COMMUNICATION,
102	/** storage array controller device. */
103	SCSI_DEVTYPE_RAIDCTL = 0x0c,
104	/** enclosure services device. */
105	SCSI_DEVTYPE_ENCLOSURE,
106	/** simplified direct-access device. */
107	SCSI_DEVTYPE_SIMPLEDISK,
108	/** optical card reader/writer device. */
109	SCSI_DEVTYPE_OCRW,
110	/** bridge controller device. */
111	SCSI_DEVTYPE_BRIDGE,
112	/** object-based storage device. */
113	SCSI_DEVTYPE_OSD
114	} SCSIDEVTYPE;
115
116	/** Mask for extracting the SCSI device type out of the first byte of the INQUIRY response. */
117	#define SCSI_DEVTYPE_MASK 0x1f
118
119	/** Mask to extract the CmdQue bit out of the seventh byte of the INQUIRY response. */
120	#define SCSI_INQUIRY_CMDQUE_MASK 0x02
121
122	/** Maximum PDU payload size we can handle in one piece. Greater or equal than
123	* s_iscsiConfigDefaultWriteSplit. */
124	#define ISCSI_DATA_LENGTH_MAX _256K
125
126	/** Maximum PDU size we can handle in one piece. */
127	#define ISCSI_RECV_PDU_BUFFER_SIZE (ISCSI_DATA_LENGTH_MAX + ISCSI_BHS_SIZE)
128
129
130	/** Version of the iSCSI standard which this initiator driver can handle. */
131	#define ISCSI_MY_VERSION 0
132
133
134	/** Length of ISCSI basic header segment. */
135	#define ISCSI_BHS_SIZE 48
136
137
138	/** Reserved task tag value. */
139	#define ISCSI_TASK_TAG_RSVD 0xffffffff
140
141
142	/**
143	* iSCSI opcodes. */
144	typedef enum ISCSIOPCODE
145	{
146	/** NOP-Out. */
147	ISCSIOP_NOP_OUT = 0x00000000,
148	/** SCSI command. */
149	ISCSIOP_SCSI_CMD = 0x01000000,
150	/** SCSI task management request. */
151	ISCSIOP_SCSI_TASKMGMT_REQ = 0x02000000,
152	/** Login request. */
153	ISCSIOP_LOGIN_REQ = 0x03000000,
154	/** Text request. */
155	ISCSIOP_TEXT_REQ = 0x04000000,
156	/** SCSI Data-Out. */
157	ISCSIOP_SCSI_DATA_OUT = 0x05000000,
158	/** Logout request. */
159	ISCSIOP_LOGOUT_REQ = 0x06000000,
160	/** SNACK request. */
161	ISCSIOP_SNACK_REQ = 0x10000000,
162
163	/** NOP-In. */
164	ISCSIOP_NOP_IN = 0x20000000,
165	/** SCSI response. */
166	ISCSIOP_SCSI_RES = 0x21000000,
167	/** SCSI Task Management response. */
168	ISCSIOP_SCSI_TASKMGMT_RES = 0x22000000,
169	/** Login response. */
170	ISCSIOP_LOGIN_RES = 0x23000000,
171	/** Text response. */
172	ISCSIOP_TEXT_RES = 0x24000000,
173	/** SCSI Data-In. */
174	ISCSIOP_SCSI_DATA_IN = 0x25000000,
175	/** Logout response. */
176	ISCSIOP_LOGOUT_RES = 0x26000000,
177	/** Ready To Transfer (R2T). */
178	ISCSIOP_R2T = 0x31000000,
179	/** Asynchronous message. */
180	ISCSIOP_ASYN_MSG = 0x32000000,
181	/** Reject. */
182	ISCSIOP_REJECT = 0x3f000000
183	} ISCSIOPCODE;
184
185	/** Mask for extracting the iSCSI opcode out of the first header word. */
186	#define ISCSIOP_MASK 0x3f000000
187
188
189	/** ISCSI BHS word 0: Request should be processed immediately. */
190	#define ISCSI_IMMEDIATE_DELIVERY_BIT 0x40000000
191
192	/** ISCSI BHS word 0: This is the final PDU for this request/response. */
193	#define ISCSI_FINAL_BIT 0x00800000
194	/** ISCSI BHS word 0: Mask for extracting the CSG. */
195	#define ISCSI_CSG_MASK 0x000c0000
196	/** ISCSI BHS word 0: Shift offset for extracting the CSG. */
197	#define ISCSI_CSG_SHIFT 18
198	/** ISCSI BHS word 0: Mask for extracting the NSG. */
199	#define ISCSI_NSG_MASK 0x00030000
200	/** ISCSI BHS word 0: Shift offset for extracting the NSG. */
201	#define ISCSI_NSG_SHIFT 16
202
203	/** ISCSI BHS word 0: task attribute untagged */
204	#define ISCSI_TASK_ATTR_UNTAGGED 0x00000000
205	/** ISCSI BHS word 0: task attribute simple */
206	#define ISCSI_TASK_ATTR_SIMPLE 0x00010000
207	/** ISCSI BHS word 0: task attribute ordered */
208	#define ISCSI_TASK_ATTR_ORDERED 0x00020000
209	/** ISCSI BHS word 0: task attribute head of queue */
210	#define ISCSI_TASK_ATTR_HOQ 0x00030000
211	/** ISCSI BHS word 0: task attribute ACA */
212	#define ISCSI_TASK_ATTR_ACA 0x00040000
213
214	/** ISCSI BHS word 0: transit to next login phase. */
215	#define ISCSI_TRANSIT_BIT 0x00800000
216	/** ISCSI BHS word 0: continue with login negotiation. */
217	#define ISCSI_CONTINUE_BIT 0x00400000
218
219	/** ISCSI BHS word 0: residual underflow. */
220	#define ISCSI_RESIDUAL_UNFL_BIT 0x00020000
221	/** ISCSI BHS word 0: residual overflow. */
222	#define ISCSI_RESIDUAL_OVFL_BIT 0x00040000
223	/** ISCSI BHS word 0: Bidirectional read residual underflow. */
224	#define ISCSI_BI_READ_RESIDUAL_UNFL_BIT 0x00080000
225	/** ISCSI BHS word 0: Bidirectional read residual overflow. */
226	#define ISCSI_BI_READ_RESIDUAL_OVFL_BIT 0x00100000
227
228	/** ISCSI BHS word 0: SCSI response mask. */
229	#define ISCSI_SCSI_RESPONSE_MASK 0x0000ff00
230	/** ISCSI BHS word 0: SCSI status mask. */
231	#define ISCSI_SCSI_STATUS_MASK 0x000000ff
232
233	/** ISCSI BHS word 0: response includes status. */
234	#define ISCSI_STATUS_BIT 0x00010000
235
236	/** Maximum number of scatter/gather segments needed to send a PDU. */
237	#define ISCSI_SG_SEGMENTS_MAX 4
238
239	/** Number of entries in the command table. */
240	#define ISCSI_CMD_WAITING_ENTRIES 32
241
242	/**
243	* iSCSI login status class. */
244	typedef enum ISCSILOGINSTATUSCLASS
245	{
246	/** Success. */
247	ISCSI_LOGIN_STATUS_CLASS_SUCCESS = 0,
248	/** Redirection. */
249	ISCSI_LOGIN_STATUS_CLASS_REDIRECTION,
250	/** Initiator error. */
251	ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR,
252	/** Target error. */
253	ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR
254	} ISCSILOGINSTATUSCLASS;
255
256
257	/**
258	* iSCSI connection state. */
259	typedef enum ISCSISTATE
260	{
261	/** Not having a connection/session at all. */
262	ISCSISTATE_FREE,
263	/** Currently trying to login. */
264	ISCSISTATE_IN_LOGIN,
265	/** Normal operation, corresponds roughly to the Full Feature Phase. */
266	ISCSISTATE_NORMAL,
267	/** Currently trying to logout. */
268	ISCSISTATE_IN_LOGOUT
269	} ISCSISTATE;
270
271	/**
272	* iSCSI PDU send/receive flags (and maybe more in the future). */
273	typedef enum ISCSIPDUFLAGS
274	{
275	/** No special flags */
276	ISCSIPDU_DEFAULT = 0,
277	/** Do not attempt to re-attach to the target if the connection is lost */
278	ISCSIPDU_NO_REATTACH = RT_BIT(1)
279	} ISCSIPDUFLAGS;
280
281
282	/*********************************************************************************************************************************
283	* Structures and Typedefs *
284	*********************************************************************************************************************************/
285
286	/**
287	* iSCSI login negotiation parameter
288	*/
289	typedef struct ISCSIPARAMETER
290	{
291	/** Name of the parameter. */
292	const char *pszParamName;
293	/** Value of the parameter. */
294	const char *pszParamValue;
295	/** Length of the binary parameter. 0=zero-terminated string. */
296	size_t cbParamValue;
297	} ISCSIPARAMETER;
298
299
300	/**
301	* iSCSI Response PDU buffer (scatter).
302	*/
303	typedef struct ISCSIRES
304	{
305	/** Length of PDU segment. */
306	size_t cbSeg;
307	/** Pointer to PDU segment. */
308	void *pvSeg;
309	} ISCSIRES;
310	/** Pointer to an iSCSI Response PDU buffer. */
311	typedef ISCSIRES *PISCSIRES;
312	/** Pointer to a const iSCSI Response PDU buffer. */
313	typedef ISCSIRES const *PCISCSIRES;
314
315
316	/**
317	* iSCSI Request PDU buffer (gather).
318	*/
319	typedef struct ISCSIREQ
320	{
321	/** Length of PDU segment in bytes. */
322	size_t cbSeg;
323	/** Pointer to PDU segment. */
324	const void *pcvSeg;
325	} ISCSIREQ;
326	/** Pointer to an iSCSI Request PDU buffer. */
327	typedef ISCSIREQ *PISCSIREQ;
328	/** Pointer to a const iSCSI Request PDU buffer. */
329	typedef ISCSIREQ const *PCISCSIREQ;
330
331
332	/**
333	* SCSI transfer directions.
334	*/
335	typedef enum SCSIXFER
336	{
337	SCSIXFER_NONE = 0,
338	SCSIXFER_TO_TARGET,
339	SCSIXFER_FROM_TARGET,
340	SCSIXFER_TO_FROM_TARGET
341	} SCSIXFER, *PSCSIXFER;
342
343	/** Forward declaration. */
344	typedef struct ISCSIIMAGE *PISCSIIMAGE;
345
346	/**
347	* SCSI request structure.
348	*/
349	typedef struct SCSIREQ
350	{
351	/** I/O context associated with this request. */
352	PVDIOCTX pIoCtx;
353	/** Transfer direction. */
354	SCSIXFER enmXfer;
355	/** Length of command block. */
356	size_t cbCDB;
357	/** Length of Initiator2Target data buffer. */
358	size_t cbI2TData;
359	/** Length of Target2Initiator data buffer. */
360	size_t cbT2IData;
361	/** Length of sense buffer
362	* This contains the number of sense bytes received upon completion. */
363	size_t cbSense;
364	/** Completion status of the command. */
365	uint8_t status;
366	/** The CDB. */
367	uint8_t abCDB[16];
368	/** The sense buffer. */
369	uint8_t abSense[96];
370	/** Status code to return if we got sense data. */
371	int rcSense;
372	/** Pointer to the Initiator2Target S/G list. */
373	PRTSGSEG paI2TSegs;
374	/** Number of entries in the I2T S/G list. */
375	unsigned cI2TSegs;
376	/** Pointer to the Target2Initiator S/G list. */
377	PRTSGSEG paT2ISegs;
378	/** Number of entries in the T2I S/G list. */
379	unsigned cT2ISegs;
380	/** S/G buffer for the target to initiator bits. */
381	RTSGBUF SgBufT2I;
382	/** Number of retries if the command completes with sense
383	* data before we return with an error.
384	*/
385	unsigned cSenseRetries;
386	/** The S/G list - variable in size.
387	* This array holds both the I2T and T2I segments.
388	* The I2T segments are first and the T2I are second.
389	*/
390	RTSGSEG aSegs[1];
391	} SCSIREQ, *PSCSIREQ;
392
393	typedef enum ISCSICMDTYPE
394	{
395	/** Process a SCSI request. */
396	ISCSICMDTYPE_REQ = 0,
397	/** Call a function in the I/O thread. */
398	ISCSICMDTYPE_EXEC,
399	/** Usual 32bit hack. */
400	ISCSICMDTYPE_32BIT_HACK = 0x7fffffff
401	} ISCSICMDTYPE;
402
403
404	/** The command completion function. */
405	typedef DECLCALLBACKTYPE(void, FNISCSICMDCOMPLETED,(PISCSIIMAGE pImage, int rcReq, void *pvUser));
406	/** Pointer to a command completion function. */
407	typedef FNISCSICMDCOMPLETED *PFNISCSICMDCOMPLETED;
408
409	/** The command execution function. */
410	typedef DECLCALLBACKTYPE(int, FNISCSIEXEC,(void *pvUser));
411	/** Pointer to a command execution function. */
412	typedef FNISCSIEXEC *PFNISCSIEXEC;
413
414	/**
415	* Structure used to complete a synchronous request.
416	*/
417	typedef struct ISCSICMDSYNC
418	{
419	/** Event semaphore to wakeup the waiting thread. */
420	RTSEMEVENT EventSem;
421	/** Status code of the command. */
422	int rcCmd;
423	} ISCSICMDSYNC, *PISCSICMDSYNC;
424
425	/**
426	* iSCSI command.
427	* Used to forward requests to the I/O thread
428	* if existing.
429	*/
430	typedef struct ISCSICMD
431	{
432	/** Next one in the list. */
433	struct ISCSICMD *pNext;
434	/** Assigned ITT. */
435	uint32_t Itt;
436	/** Completion callback. */
437	PFNISCSICMDCOMPLETED pfnComplete;
438	/** Opaque user data. */
439	void *pvUser;
440	/** Command to execute. */
441	ISCSICMDTYPE enmCmdType;
442	/** Command type dependent data. */
443	union
444	{
445	/** Process a SCSI request. */
446	struct
447	{
448	/** The SCSI request to process. */
449	PSCSIREQ pScsiReq;
450	} ScsiReq;
451	/** Call a function in the I/O thread. */
452	struct
453	{
454	/** The method to execute. */
455	PFNISCSIEXEC pfnExec;
456	/** User data. */
457	void *pvUser;
458	} Exec;
459	} CmdType;
460	} ISCSICMD, *PISCSICMD;
461
462	/**
463	* Send iSCSI PDU.
464	* Contains all necessary data to send a PDU.
465	*/
466	typedef struct ISCSIPDUTX
467	{
468	/** Pointer to the next PDu to send. */
469	struct ISCSIPDUTX *pNext;
470	/** The BHS. */
471	uint32_t aBHS[12];
472	/** Assigned CmdSN for this PDU. */
473	uint32_t CmdSN;
474	/** The S/G buffer used for sending. */
475	RTSGBUF SgBuf;
476	/** Number of bytes to send until the PDU completed. */
477	size_t cbSgLeft;
478	/** The iSCSI command this PDU belongs to. */
479	PISCSICMD pIScsiCmd;
480	/** Number of segments in the request segments array. */
481	unsigned cISCSIReq;
482	/** The request segments - variable in size. */
483	RTSGSEG aISCSIReq[1];
484	} ISCSIPDUTX, *PISCSIPDUTX;
485
486	/**
487	* Block driver instance data.
488	*/
489	typedef struct ISCSIIMAGE
490	{
491	/** Pointer to the filename (location). Not really used. */
492	const char *pszFilename;
493	/** Pointer to the initiator name. */
494	char *pszInitiatorName;
495	/** Pointer to the target name. */
496	char *pszTargetName;
497	/** Pointer to the target address. */
498	char *pszTargetAddress;
499	/** Pointer to the user name for authenticating the Initiator. */
500	char *pszInitiatorUsername;
501	/** Pointer to the secret for authenticating the Initiator. */
502	uint8_t *pbInitiatorSecret;
503	/** Length of the secret for authenticating the Initiator. */
504	size_t cbInitiatorSecret;
505	/** Pointer to the user name for authenticating the Target. */
506	char *pszTargetUsername;
507	/** Pointer to the secret for authenticating the Initiator. */
508	uint8_t *pbTargetSecret;
509	/** Length of the secret for authenticating the Initiator. */
510	size_t cbTargetSecret;
511	/** Limit for iSCSI writes, essentially limiting the amount of data
512	* written in a single write. This is negotiated with the target, so
513	* the actual size might be smaller. */
514	uint32_t cbWriteSplit;
515	/** Initiator session identifier. */
516	uint64_t ISID;
517	/** SCSI Logical Unit Number. */
518	uint64_t LUN;
519	/** Pointer to the per-disk VD interface list. */
520	PVDINTERFACE pVDIfsDisk;
521	/** Pointer to the per-image VD interface list. */
522	PVDINTERFACE pVDIfsImage;
523	/** Error interface. */
524	PVDINTERFACEERROR pIfError;
525	/** Config interface. */
526	PVDINTERFACECONFIG pIfConfig;
527	/** I/O interface. */
528	PVDINTERFACEIOINT pIfIo;
529	/** TCP network stack interface. */
530	PVDINTERFACETCPNET pIfNet;
531	/** Image open flags. */
532	unsigned uOpenFlags;
533	/** Number of re-login retries when a connection fails. */
534	uint32_t cISCSIRetries;
535	/** Sector size on volume. */
536	uint32_t cbSector;
537	/** Size of volume in sectors. */
538	uint64_t cVolume;
539	/** Total volume size in bytes. Easier than multiplying the above values all the time. */
540	uint64_t cbSize;
541
542	/** Negotiated maximum data length when sending to target. */
543	uint32_t cbSendDataLength;
544	/** Negotiated maximum data length when receiving from target. */
545	uint32_t cbRecvDataLength;
546
547	/** Current state of the connection/session. */
548	ISCSISTATE state;
549	/** Flag whether the first Login Response PDU has been seen. */
550	bool FirstRecvPDU;
551	/** Initiator Task Tag of the last iSCSI request PDU. */
552	uint32_t ITT;
553	/** Sequence number of the last command. */
554	uint32_t CmdSN;
555	/** Sequence number of the next command expected by the target. */
556	uint32_t ExpCmdSN;
557	/** Maximum sequence number accepted by the target (determines size of window). */
558	uint32_t MaxCmdSN;
559	/** Expected sequence number of next status. */
560	uint32_t ExpStatSN;
561	/** Currently active request. */
562	PISCSIREQ paCurrReq;
563	/** Segment number of currently active request. */
564	uint32_t cnCurrReq;
565	/** Pointer to receive PDU buffer. (Freed by RT) */
566	void *pvRecvPDUBuf;
567	/** Length of receive PDU buffer. */
568	size_t cbRecvPDUBuf;
569	/** Mutex protecting against concurrent use from several threads. */
570	RTSEMMUTEX Mutex;
571
572	/** Pointer to the target hostname. */
573	char *pszHostname;
574	/** Port to use on the target host. */
575	uint32_t uPort;
576	/** Socket handle of the TCP connection. */
577	VDSOCKET Socket;
578	/** Timeout for read operations on the TCP connection (in milliseconds). */
579	uint32_t uReadTimeout;
580	/** Flag whether to automatically generate the initiator name. */
581	bool fAutomaticInitiatorName;
582	/** Flag whether to automatically determine the LUN. */
583	bool fAutomaticLUN;
584	/** Flag whether to use the host IP stack or DevINIP. */
585	bool fHostIP;
586	/** Flag whether to dump malformed packets in the release log. */
587	bool fDumpMalformedPackets;
588	/** Flag whtether the target is readonly. */
589	bool fTargetReadOnly;
590	/** Flag whether to retry the connection before processing new requests. */
591	bool fTryReconnect;
592
593	/** Head of request queue */
594	PISCSICMD pScsiReqQueue;
595	/** Mutex protecting the request queue from concurrent access. */
596	RTSEMMUTEX MutexReqQueue;
597	/** I/O thread. */
598	RTTHREAD hThreadIo;
599	/** Flag whether the thread should be still running. */
600	volatile bool fRunning;
601	/* Flag whether the target supports command queuing. */
602	bool fCmdQueuingSupported;
603	/** Flag whether extended select is supported. */
604	bool fExtendedSelectSupported;
605	/** Padding used for aligning the PDUs. */
606	uint8_t aPadding[4];
607	/** Socket events to poll for. */
608	uint32_t fPollEvents;
609	/** Number of bytes to read to complete the current PDU. */
610	size_t cbRecvPDUResidual;
611	/** Current position in the PDU buffer. */
612	uint8_t *pbRecvPDUBufCur;
613	/** Flag whether we are currently reading the BHS. */
614	bool fRecvPDUBHS;
615	/** List of PDUs waiting to get transmitted. */
616	PISCSIPDUTX pIScsiPDUTxHead;
617	/** Tail of PDUs waiting to get transmitted. */
618	PISCSIPDUTX pIScsiPDUTxTail;
619	/** PDU we are currently transmitting. */
620	PISCSIPDUTX pIScsiPDUTxCur;
621	/** Number of commands waiting for an answer from the target.
622	* Used for timeout handling for poll.
623	*/
624	unsigned cCmdsWaiting;
625	/** Table of commands waiting for a response from the target. */
626	PISCSICMD aCmdsWaiting[ISCSI_CMD_WAITING_ENTRIES];
627	/** Number of logins since last successful I/O.
628	* Used to catch the case where logging succeeds but
629	* processing read/write/flushes cause a disconnect.
630	*/
631	volatile uint32_t cLoginsSinceIo;
632
633	/** Release log counter. */
634	unsigned cLogRelErrors;
635	/** The static region list. */
636	VDREGIONLIST RegionList;
637	} ISCSIIMAGE;
638
639
640	/*********************************************************************************************************************************
641	* Static Variables *
642	*********************************************************************************************************************************/
643
644	/** Default initiator basename. */
645	static const char *s_iscsiDefaultInitiatorBasename = "iqn.2009-08.com.sun.virtualbox.initiator";
646
647	/** Default LUN. */
648	static const char *s_iscsiConfigDefaultLUN = "0";
649
650	/** Default timeout, 10 seconds. */
651	static const char *s_iscsiConfigDefaultTimeout = "10000";
652
653	/** Default write split value, less or equal to ISCSI_DATA_LENGTH_MAX. */
654	static const char *s_iscsiConfigDefaultWriteSplit = "262144";
655
656	/** Default host IP stack. */
657	static const char *s_iscsiConfigDefaultHostIPStack = "1";
658
659	/** Default dump malformed packet configuration value. */
660	static const char *s_iscsiConfigDefaultDumpMalformedPackets = "0";
661
662	/** Description of all accepted config parameters. */
663	static const VDCONFIGINFO s_iscsiConfigInfo[] =
664	{
665	{ "TargetName", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
666	/* LUN is defined of string type to handle the "enc" prefix. */
667	{ "LUN", s_iscsiConfigDefaultLUN, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
668	{ "TargetAddress", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
669	{ "InitiatorName", NULL, VDCFGVALUETYPE_STRING, 0 },
670	{ "InitiatorUsername", NULL, VDCFGVALUETYPE_STRING, 0 },
671	{ "InitiatorSecret", NULL, VDCFGVALUETYPE_BYTES, 0 },
672	{ "TargetUsername", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_EXPERT },
673	{ "TargetSecret", NULL, VDCFGVALUETYPE_BYTES, VD_CFGKEY_EXPERT },
674	{ "WriteSplit", s_iscsiConfigDefaultWriteSplit, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
675	{ "Timeout", s_iscsiConfigDefaultTimeout, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
676	{ "HostIPStack", s_iscsiConfigDefaultHostIPStack, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
677	{ "DumpMalformedPackets", s_iscsiConfigDefaultDumpMalformedPackets, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
678	{ NULL, NULL, VDCFGVALUETYPE_INTEGER, 0 }
679	};
680
681
682	/*********************************************************************************************************************************
683	* Internal Functions *
684	*********************************************************************************************************************************/
685
686	/* iSCSI low-level functions (only to be used from the iSCSI high-level functions). */
687	static uint32_t iscsiNewITT(PISCSIIMAGE pImage);
688	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq, uint32_t uFlags);
689	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes, uint32_t fFlags);
690	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage);
691	static int iscsiSendPDUAsync(PISCSIIMAGE pImage);
692	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes);
693	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
694	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd);
695	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
696	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd);
697	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char pcszKey, const char pcszValue, size_t cbValue);
698	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue);
699	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue);
700	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf);
701
702	/* Serial number arithmetic comparison. */
703	static bool serial_number_less(uint32_t sn1, uint32_t sn2);
704	static bool serial_number_greater(uint32_t sn1, uint32_t sn2);
705
706	/* CHAP-MD5 functions. */
707	#ifdef IMPLEMENT_TARGET_AUTH
708	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge);
709	#endif
710	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
711	const uint8_t *pbSecret, size_t cbSecret);
712
713	/**
714	* Internal: release log wrapper limiting the number of entries.
715	*/
716	DECLINLINE(void) iscsiLogRel(PISCSIIMAGE pImage, const char *pcszFormat, ...)
717	{
718	if (pImage->cLogRelErrors++ < MAX_LOG_REL_ERRORS)
719	{
720	va_list va;
721
722	va_start(va, pcszFormat);
723	LogRel(("%N\n", pcszFormat, &va));
724	va_end(va);
725	}
726	}
727
728	DECLINLINE(bool) iscsiIsClientConnected(PISCSIIMAGE pImage)
729	{
730	return pImage->Socket != NIL_VDSOCKET
731	&& pImage->pIfNet->pfnIsClientConnected(pImage->Socket);
732	}
733
734	/**
735	* Calculates the hash for the given ITT used
736	* to look up the command in the table.
737	*/
738	DECLINLINE(uint32_t) iscsiIttHash(uint32_t Itt)
739	{
740	return Itt % ISCSI_CMD_WAITING_ENTRIES;
741	}
742
743	static PISCSICMD iscsiCmdGetFromItt(PISCSIIMAGE pImage, uint32_t Itt)
744	{
745	PISCSICMD pIScsiCmd = NULL;
746
747	pIScsiCmd = pImage->aCmdsWaiting[iscsiIttHash(Itt)];
748
749	while ( pIScsiCmd
750	&& pIScsiCmd->Itt != Itt)
751	pIScsiCmd = pIScsiCmd->pNext;
752
753	return pIScsiCmd;
754	}
755
756	static void iscsiCmdInsert(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
757	{
758	PISCSICMD pIScsiCmdOld;
759	uint32_t idx = iscsiIttHash(pIScsiCmd->Itt);
760
761	Assert(!pIScsiCmd->pNext);
762
763	pIScsiCmdOld = pImage->aCmdsWaiting[idx];
764	pIScsiCmd->pNext = pIScsiCmdOld;
765	pImage->aCmdsWaiting[idx] = pIScsiCmd;
766	pImage->cCmdsWaiting++;
767	}
768
769	static PISCSICMD iscsiCmdRemove(PISCSIIMAGE pImage, uint32_t Itt)
770	{
771	PISCSICMD pIScsiCmd = NULL;
772	PISCSICMD pIScsiCmdPrev = NULL;
773	uint32_t idx = iscsiIttHash(Itt);
774
775	pIScsiCmd = pImage->aCmdsWaiting[idx];
776
777	while ( pIScsiCmd
778	&& pIScsiCmd->Itt != Itt)
779	{
780	pIScsiCmdPrev = pIScsiCmd;
781	pIScsiCmd = pIScsiCmd->pNext;
782	}
783
784	if (pIScsiCmd)
785	{
786	if (pIScsiCmdPrev)
787	{
788	AssertPtrNull(pIScsiCmd->pNext);
789	pIScsiCmdPrev->pNext = pIScsiCmd->pNext;
790	}
791	else
792	{
793	pImage->aCmdsWaiting[idx] = pIScsiCmd->pNext;
794	AssertPtrNull(pImage->aCmdsWaiting[idx]);
795	}
796	pImage->cCmdsWaiting--;
797	}
798
799	return pIScsiCmd;
800	}
801
802	/**
803	* Removes all commands from the table and returns the
804	* list head
805	*
806	* @returns Pointer to the head of the command list.
807	* @param pImage iSCSI connection to use.
808	*/
809	static PISCSICMD iscsiCmdRemoveAll(PISCSIIMAGE pImage)
810	{
811	PISCSICMD pIScsiCmdHead = NULL;
812
813	for (unsigned idx = 0; idx < RT_ELEMENTS(pImage->aCmdsWaiting); idx++)
814	{
815	PISCSICMD pHead;
816	PISCSICMD pTail;
817
818	pHead = pImage->aCmdsWaiting[idx];
819	pImage->aCmdsWaiting[idx] = NULL;
820
821	if (pHead)
822	{
823	/* Get the tail. */
824	pTail = pHead;
825	while (pTail->pNext)
826	pTail = pTail->pNext;
827
828	/* Concatenate. */
829	pTail->pNext = pIScsiCmdHead;
830	pIScsiCmdHead = pHead;
831	}
832	}
833	pImage->cCmdsWaiting = 0;
834
835	return pIScsiCmdHead;
836	}
837
838	/**
839	* Dumps an iSCSI packet if enabled.
840	*
841	* @returns nothing.
842	* @param pImage The iSCSI image instance data.
843	* @param paISCSISegs Pointer to the segments array.
844	* @param cnISCSISegs Number of segments in the array.
845	* @param rc Status code for this packet.
846	* @param fRequest Flag whether this is request or response packet.
847	*/
848	static void iscsiDumpPacket(PISCSIIMAGE pImage, PISCSIREQ paISCSISegs, unsigned cnISCSISegs, int rc, bool fRequest)
849	{
850	if (pImage->fDumpMalformedPackets)
851	{
852	LogRel(("iSCSI{%s}: Dumping %s packet completed with status code %Rrc\n", pImage->pszTargetName, fRequest ? "request" : "response", rc));
853	for (unsigned i = 0; i < cnISCSISegs; i++)
854	{
855	if (paISCSISegs[i].cbSeg)
856	{
857	LogRel(("iSCSI{%s}: Segment %u, size %zu\n"
858	"%.*Rhxd\n",
859	pImage->pszTargetName, i, paISCSISegs[i].cbSeg,
860	paISCSISegs[i].cbSeg, paISCSISegs[i].pcvSeg));
861	}
862	}
863	}
864	}
865
866	static int iscsiTransportConnect(PISCSIIMAGE pImage)
867	{
868	int rc;
869	if (!pImage->pszHostname)
870	return VERR_NET_DEST_ADDRESS_REQUIRED;
871
872	rc = pImage->pIfNet->pfnClientConnect(pImage->Socket, pImage->pszHostname, pImage->uPort, pImage->uReadTimeout);
873	if (RT_FAILURE(rc))
874	{
875	if ( rc == VERR_NET_CONNECTION_REFUSED
876	\|\| rc == VERR_NET_CONNECTION_RESET
877	\|\| rc == VERR_NET_UNREACHABLE
878	\|\| rc == VERR_NET_HOST_UNREACHABLE
879	\|\| rc == VERR_NET_CONNECTION_TIMED_OUT)
880	{
881	/* Standardize return value for no connection. */
882	rc = VERR_NET_CONNECTION_REFUSED;
883	}
884	return rc;
885	}
886
887	/* Disable Nagle algorithm, we want things to be sent immediately. */
888	pImage->pIfNet->pfnSetSendCoalescing(pImage->Socket, false);
889
890	/* Make initiator name and ISID unique on this host. */
891	RTNETADDR LocalAddr;
892	rc = pImage->pIfNet->pfnGetLocalAddress(pImage->Socket, &LocalAddr);
893	if (RT_FAILURE(rc))
894	return rc;
895	if ( LocalAddr.uPort == RTNETADDR_PORT_NA
896	\|\| LocalAddr.uPort > 65535)
897	return VERR_NET_ADDRESS_FAMILY_NOT_SUPPORTED;
898	pImage->ISID &= ~65535ULL;
899	pImage->ISID \|= LocalAddr.uPort;
900	/* Eliminate the port so that it isn't included below. */
901	LocalAddr.uPort = RTNETADDR_PORT_NA;
902	if (pImage->fAutomaticInitiatorName)
903	{
904	if (pImage->pszInitiatorName)
905	RTStrFree(pImage->pszInitiatorName);
906	RTStrAPrintf(&pImage->pszInitiatorName, "%s:01:%RTnaddr",
907	s_iscsiDefaultInitiatorBasename, &LocalAddr);
908	if (!pImage->pszInitiatorName)
909	return VERR_NO_MEMORY;
910	}
911	LogRel(("iSCSI: connect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
912	return VINF_SUCCESS;
913	}
914
915
916	static int iscsiTransportClose(PISCSIIMAGE pImage)
917	{
918	int rc;
919
920	LogFlowFunc(("(%s:%d)\n", pImage->pszHostname, pImage->uPort));
921	if (iscsiIsClientConnected(pImage))
922	{
923	LogRel(("iSCSI: disconnect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
924	rc = pImage->pIfNet->pfnClientClose(pImage->Socket);
925	}
926	else
927	rc = VINF_SUCCESS;
928	LogFlowFunc(("returns %Rrc\n", rc));
929	return rc;
930	}
931
932
933	static int iscsiTransportRead(PISCSIIMAGE pImage, PISCSIRES paResponse, unsigned int cnResponse)
934	{
935	int rc = VINF_SUCCESS;
936	unsigned int i = 0;
937	size_t cbToRead, cbActuallyRead, residual, cbSegActual = 0, cbAHSLength, cbDataLength;
938	char *pDst;
939
940	LogFlowFunc(("cnResponse=%d (%s:%d)\n", cnResponse, pImage->pszHostname, pImage->uPort));
941	if (!iscsiIsClientConnected(pImage))
942	{
943	/* Reconnecting makes no sense in this case, as there will be nothing
944	* to receive. We would just run into a timeout. */
945	rc = VERR_BROKEN_PIPE;
946	}
947
948	if (RT_SUCCESS(rc) && paResponse[0].cbSeg >= ISCSI_BHS_SIZE)
949	{
950	cbToRead = 0;
951	residual = ISCSI_BHS_SIZE; /* Do not read more than the BHS length before the true PDU length is known. */
952	cbSegActual = residual;
953	pDst = (char *)paResponse[i].pvSeg;
954	uint64_t u64Timeout = RTTimeMilliTS() + pImage->uReadTimeout;
955	do
956	{
957	int64_t cMilliesRemaining = u64Timeout - RTTimeMilliTS();
958	if (cMilliesRemaining <= 0)
959	{
960	rc = VERR_TIMEOUT;
961	break;
962	}
963	Assert(cMilliesRemaining < 1000000);
964	rc = pImage->pIfNet->pfnSelectOne(pImage->Socket, cMilliesRemaining);
965	if (RT_FAILURE(rc))
966	break;
967	rc = pImage->pIfNet->pfnRead(pImage->Socket, pDst, residual, &cbActuallyRead);
968	if (RT_FAILURE(rc))
969	break;
970	if (cbActuallyRead == 0)
971	{
972	/* The other end has closed the connection. */
973	iscsiTransportClose(pImage);
974	pImage->state = ISCSISTATE_FREE;
975	rc = VERR_NET_CONNECTION_RESET;
976	break;
977	}
978	if (cbToRead == 0)
979	{
980	/* Currently reading the BHS. */
981	residual -= cbActuallyRead;
982	pDst += cbActuallyRead;
983	if (residual <= 40)
984	{
985	/* Enough data read to figure out the actual PDU size. */
986	uint32_t word1 = RT_N2H_U32(((uint32_t *)(paResponse[0].pvSeg))[1]);
987	cbAHSLength = (word1 & 0xff000000) >> 24;
988	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
989	cbDataLength = word1 & 0x00ffffff;
990	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
991	cbToRead = residual + cbAHSLength + cbDataLength;
992	residual += paResponse[0].cbSeg - ISCSI_BHS_SIZE;
993	if (residual > cbToRead)
994	residual = cbToRead;
995	cbSegActual = ISCSI_BHS_SIZE + cbAHSLength + cbDataLength;
996	/* Check whether we are already done with this PDU (no payload). */
997	if (cbToRead == 0)
998	break;
999	}
1000	}
1001	else
1002	{
1003	cbToRead -= cbActuallyRead;
1004	if (cbToRead == 0)
1005	break;
1006	pDst += cbActuallyRead;
1007	residual -= cbActuallyRead;
1008	}
1009	if (residual == 0)
1010	{
1011	i++;
1012	if (i >= cnResponse)
1013	{
1014	/* No space left in receive buffers. */
1015	rc = VERR_BUFFER_OVERFLOW;
1016	break;
1017	}
1018	pDst = (char *)paResponse[i].pvSeg;
1019	residual = paResponse[i].cbSeg;
1020	if (residual > cbToRead)
1021	residual = cbToRead;
1022	cbSegActual = residual;
1023	}
1024	LogFlowFunc(("cbToRead=%u residual=%u cbSegActual=%u cbActuallRead=%u\n",
1025	cbToRead, residual, cbSegActual, cbActuallyRead));
1026	} while (true);
1027	}
1028	else
1029	{
1030	if (RT_SUCCESS(rc))
1031	rc = VERR_BUFFER_OVERFLOW;
1032	}
1033	if (RT_SUCCESS(rc))
1034	{
1035	paResponse[i].cbSeg = cbSegActual;
1036	for (i++; i < cnResponse; i++)
1037	paResponse[i].cbSeg = 0;
1038	}
1039
1040	if (RT_UNLIKELY( RT_FAILURE(rc)
1041	&& ( rc == VERR_NET_CONNECTION_RESET
1042	\|\| rc == VERR_NET_CONNECTION_ABORTED
1043	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1044	\|\| rc == VERR_NET_CONNECTION_REFUSED
1045	\|\| rc == VERR_BROKEN_PIPE)))
1046	{
1047	/* Standardize return value for broken connection. */
1048	rc = VERR_BROKEN_PIPE;
1049	}
1050
1051	LogFlowFunc(("returns %Rrc\n", rc));
1052	return rc;
1053	}
1054
1055
1056	static int iscsiTransportWrite(PISCSIIMAGE pImage, PISCSIREQ paRequest, unsigned int cnRequest)
1057	{
1058	int rc = VINF_SUCCESS;
1059	unsigned int i;
1060
1061	LogFlowFunc(("cnRequest=%d (%s:%d)\n", cnRequest, pImage->pszHostname, pImage->uPort));
1062	if (!iscsiIsClientConnected(pImage))
1063	{
1064	/* Attempt to reconnect if the connection was previously broken. */
1065	rc = iscsiTransportConnect(pImage);
1066	}
1067
1068	if (RT_SUCCESS(rc))
1069	{
1070	/* Construct scatter/gather buffer for entire request, worst case
1071	* needs twice as many entries to allow for padding. */
1072	unsigned cBuf = 0;
1073	for (i = 0; i < cnRequest; i++)
1074	{
1075	cBuf++;
1076	if (paRequest[i].cbSeg & 3)
1077	cBuf++;
1078	}
1079	Assert(cBuf < ISCSI_SG_SEGMENTS_MAX);
1080	RTSGBUF buf;
1081	RTSGSEG aSeg[ISCSI_SG_SEGMENTS_MAX];
1082	static char aPad[4] = { 0, 0, 0, 0 };
1083	RTSgBufInit(&buf, &aSeg[0], cBuf);
1084	unsigned iBuf = 0;
1085	for (i = 0; i < cnRequest; i++)
1086	{
1087	/* Actual data chunk. */
1088	aSeg[iBuf].pvSeg = (void *)paRequest[i].pcvSeg;
1089	aSeg[iBuf].cbSeg = paRequest[i].cbSeg;
1090	iBuf++;
1091	/* Insert proper padding before the next chunk. */
1092	if (paRequest[i].cbSeg & 3)
1093	{
1094	aSeg[iBuf].pvSeg = &aPad[0];
1095	aSeg[iBuf].cbSeg = 4 - (paRequest[i].cbSeg & 3);
1096	iBuf++;
1097	}
1098	}
1099	/* Send out the request, the socket is set to send data immediately,
1100	* avoiding unnecessary delays. */
1101	rc = pImage->pIfNet->pfnSgWrite(pImage->Socket, &buf);
1102
1103	}
1104
1105	if (RT_UNLIKELY( RT_FAILURE(rc)
1106	&& ( rc == VERR_NET_CONNECTION_RESET
1107	\|\| rc == VERR_NET_CONNECTION_ABORTED
1108	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1109	\|\| rc == VERR_NET_CONNECTION_REFUSED
1110	\|\| rc == VERR_BROKEN_PIPE)))
1111	{
1112	/* Standardize return value for broken connection. */
1113	rc = VERR_BROKEN_PIPE;
1114	}
1115
1116	LogFlowFunc(("returns %Rrc\n", rc));
1117	return rc;
1118	}
1119
1120
1121	static int iscsiTransportOpen(PISCSIIMAGE pImage)
1122	{
1123	int rc = VINF_SUCCESS;
1124	size_t cbHostname = 0; /* shut up gcc */
1125	const char pcszPort = NULL; / shut up gcc */
1126	char *pszPortEnd;
1127	uint16_t uPort;
1128
1129	/* Clean up previous connection data. */
1130	iscsiTransportClose(pImage);
1131	if (pImage->pszHostname)
1132	{
1133	RTMemFree(pImage->pszHostname);
1134	pImage->pszHostname = NULL;
1135	pImage->uPort = 0;
1136	}
1137
1138	/* Locate the port number via the colon separating the hostname from the port. */
1139	if (*pImage->pszTargetAddress)
1140	{
1141	if (*pImage->pszTargetAddress != '[')
1142	{
1143	/* Normal hostname or IPv4 dotted decimal. */
1144	pcszPort = strchr(pImage->pszTargetAddress, ':');
1145	if (pcszPort != NULL)
1146	{
1147	cbHostname = pcszPort - pImage->pszTargetAddress;
1148	pcszPort++;
1149	}
1150	else
1151	cbHostname = strlen(pImage->pszTargetAddress);
1152	}
1153	else
1154	{
1155	/* IPv6 literal address. Contains colons, so skip to closing square bracket. */
1156	pcszPort = strchr(pImage->pszTargetAddress, ']');
1157	if (pcszPort != NULL)
1158	{
1159	pcszPort++;
1160	cbHostname = pcszPort - pImage->pszTargetAddress;
1161	if (*pcszPort == '\0')
1162	pcszPort = NULL;
1163	else if (*pcszPort != ':')
1164	rc = VERR_PARSE_ERROR;
1165	else
1166	pcszPort++;
1167	}
1168	else
1169	rc = VERR_PARSE_ERROR;
1170	}
1171	}
1172	else
1173	rc = VERR_PARSE_ERROR;
1174
1175	/* Now split address into hostname and port. */
1176	if (RT_SUCCESS(rc))
1177	{
1178	pImage->pszHostname = (char *)RTMemAlloc(cbHostname + 1);
1179	if (!pImage->pszHostname)
1180	rc = VERR_NO_MEMORY;
1181	else
1182	{
1183	if (pImage->pszTargetAddress[0] == '[')
1184	memcpy(pImage->pszHostname, pImage->pszTargetAddress + 1, cbHostname);
1185	else
1186	memcpy(pImage->pszHostname, pImage->pszTargetAddress, cbHostname);
1187	pImage->pszHostname[cbHostname] = '\0';
1188	if (pcszPort != NULL)
1189	{
1190	rc = RTStrToUInt16Ex(pcszPort, &pszPortEnd, 0, &uPort);
1191	/* Note that RT_SUCCESS() macro to check the rc value is not strict enough in this case. */
1192	if (rc == VINF_SUCCESS && *pszPortEnd == '\0' && uPort != 0)
1193	{
1194	pImage->uPort = uPort;
1195	}
1196	else
1197	{
1198	rc = VERR_PARSE_ERROR;
1199	}
1200	}
1201	else
1202	pImage->uPort = ISCSI_DEFAULT_PORT;
1203	}
1204	}
1205
1206	if (RT_SUCCESS(rc))
1207	{
1208	if (!iscsiIsClientConnected(pImage))
1209	rc = iscsiTransportConnect(pImage);
1210	}
1211	else
1212	{
1213	if (pImage->pszHostname)
1214	{
1215	RTMemFree(pImage->pszHostname);
1216	pImage->pszHostname = NULL;
1217	}
1218	pImage->uPort = 0;
1219	}
1220
1221	LogFlowFunc(("returns %Rrc\n", rc));
1222	return rc;
1223	}
1224
1225	/**
1226	* Returns a human readable version of the given initiator login error detail.
1227	*
1228	* @returns String with the error detail.
1229	* @param u8Detail The detail indicator from the response.
1230	*/
1231	static const char *iscsiGetLoginErrorDetail(uint8_t u8Detail)
1232	{
1233	const char *pszDetail = NULL;
1234
1235	switch (u8Detail)
1236	{
1237	case 0x00:
1238	pszDetail = "Miscelleanous iSCSI intiaitor error";
1239	break;
1240	case 0x01:
1241	pszDetail = "Authentication failure";
1242	break;
1243	case 0x02:
1244	pszDetail = "Authorization failure";
1245	break;
1246	case 0x03:
1247	pszDetail = "Not found";
1248	break;
1249	case 0x04:
1250	pszDetail = "Target removed";
1251	break;
1252	case 0x05:
1253	pszDetail = "Unsupported version";
1254	break;
1255	case 0x06:
1256	pszDetail = "Too many connections";
1257	break;
1258	case 0x07:
1259	pszDetail = "Missing parameter";
1260	break;
1261	case 0x08:
1262	pszDetail = "Can't include in session";
1263	break;
1264	case 0x09:
1265	pszDetail = "Session type not supported";
1266	break;
1267	case 0x0a:
1268	pszDetail = "Session does not exist";
1269	break;
1270	case 0x0b:
1271	pszDetail = "Invalid request type during login";
1272	break;
1273	default:
1274	pszDetail = "Unknown status detail";
1275	}
1276
1277	return pszDetail;
1278	}
1279
1280	/**
1281	* Attempts one login attempt to the given target.
1282	*
1283	* @returns VBox status code.
1284	* @retval VINF_TRY_AGAIN when getting redirected and having to start over.
1285	* @retval VERR_TRY_AGAIN in case the connection was lost while receiving a reply
1286	* from the target and the login attempt can be repeated.
1287	* @param pImage The iSCSI connection state to be used.
1288	*/
1289	static int iscsiLogin(PISCSIIMAGE pImage)
1290	{
1291	int rc = VINF_SUCCESS;
1292	uint32_t itt;
1293	uint32_t csg, nsg, substate;
1294	uint64_t isid_tsih;
1295	uint8_t bBuf[4096]; /* Should be large enough even for large authentication values. */
1296	size_t cbBuf;
1297	bool transit;
1298	uint8_t pbChallenge[1024]; /* RFC3720 specifies this as maximum. */
1299	size_t cbChallenge = 0; /* shut up gcc */
1300	uint8_t bChapIdx = 0; /* (MSC is used uninitialized) */
1301	uint8_t aResponse[RTMD5HASHSIZE];
1302	uint32_t cnISCSIReq = 0;
1303	ISCSIREQ aISCSIReq[4];
1304	uint32_t aReqBHS[12];
1305	uint32_t cnISCSIRes = 0;
1306	ISCSIRES aISCSIRes[2];
1307	uint32_t aResBHS[12];
1308	char *pszNext;
1309	bool fParameterNeg = true;
1310	pImage->cbRecvDataLength = ISCSI_DATA_LENGTH_MAX;
1311	pImage->cbSendDataLength = RT_MIN(ISCSI_DATA_LENGTH_MAX, pImage->cbWriteSplit);
1312	char szMaxDataLength[16];
1313	RTStrPrintf(szMaxDataLength, sizeof(szMaxDataLength), "%u", ISCSI_DATA_LENGTH_MAX);
1314	ISCSIPARAMETER aParameterNeg[] =
1315	{
1316	{ "HeaderDigest", "None", 0 },
1317	{ "DataDigest", "None", 0 },
1318	{ "MaxConnections", "1", 0 },
1319	{ "InitialR2T", "No", 0 },
1320	{ "ImmediateData", "Yes", 0 },
1321	{ "MaxRecvDataSegmentLength", szMaxDataLength, 0 },
1322	{ "MaxBurstLength", szMaxDataLength, 0 },
1323	{ "FirstBurstLength", szMaxDataLength, 0 },
1324	{ "DefaultTime2Wait", "0", 0 },
1325	{ "DefaultTime2Retain", "60", 0 },
1326	{ "DataPDUInOrder", "Yes", 0 },
1327	{ "DataSequenceInOrder", "Yes", 0 },
1328	{ "ErrorRecoveryLevel", "0", 0 },
1329	{ "MaxOutstandingR2T", "1", 0 }
1330	};
1331
1332	if (!iscsiIsClientConnected(pImage))
1333	{
1334	rc = iscsiTransportOpen(pImage);
1335	if (RT_FAILURE(rc))
1336	return rc;
1337	}
1338
1339	pImage->state = ISCSISTATE_IN_LOGIN;
1340	pImage->ITT = 1;
1341	pImage->FirstRecvPDU = true;
1342	pImage->CmdSN = 1;
1343	pImage->ExpCmdSN = 0;
1344	pImage->MaxCmdSN = 1;
1345	pImage->ExpStatSN = 0;
1346
1347	/*
1348	* Send login request to target.
1349	*/
1350	itt = iscsiNewITT(pImage);
1351	csg = 0;
1352	nsg = 0;
1353	substate = 0;
1354	isid_tsih = pImage->ISID << 16; /* TSIH field currently always 0 */
1355
1356	do
1357	{
1358	transit = false;
1359	cbBuf = 0;
1360	/* Handle all cases with a single switch statement. */
1361	switch (csg << 8 \| substate)
1362	{
1363	case 0x0000: /* security negotiation, step 0: propose authentication. */
1364	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "SessionType", "Normal", 0);
1365	if (RT_FAILURE(rc))
1366	break;
1367	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "InitiatorName", pImage->pszInitiatorName, 0);
1368	if (RT_FAILURE(rc))
1369	break;
1370	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "TargetName", pImage->pszTargetName, 0);
1371	if (RT_FAILURE(rc))
1372	break;
1373	if (pImage->pszInitiatorUsername == NULL)
1374	{
1375	/* No authentication. Immediately switch to next phase. */
1376	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "None", 0);
1377	if (RT_FAILURE(rc))
1378	break;
1379	nsg = 1;
1380	transit = true;
1381	}
1382	else
1383	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "CHAP,None", 0);
1384	break;
1385	case 0x0001: /* security negotiation, step 1: propose CHAP_MD5 variant. */
1386	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_A", "5", 0);
1387	break;
1388	case 0x0002: /* security negotiation, step 2: send authentication info. */
1389	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_N", pImage->pszInitiatorUsername, 0);
1390	if (RT_FAILURE(rc))
1391	break;
1392	chap_md5_compute_response(aResponse, bChapIdx, pbChallenge, cbChallenge,
1393	pImage->pbInitiatorSecret, pImage->cbInitiatorSecret);
1394	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_R", (const char *)aResponse, RTMD5HASHSIZE);
1395	if (RT_FAILURE(rc))
1396	break;
1397	nsg = 1;
1398	transit = true;
1399	break;
1400	case 0x0100: /* login operational negotiation, step 0: set parameters. */
1401	if (fParameterNeg)
1402	{
1403	for (unsigned i = 0; i < RT_ELEMENTS(aParameterNeg); i++)
1404	{
1405	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf,
1406	aParameterNeg[i].pszParamName,
1407	aParameterNeg[i].pszParamValue,
1408	aParameterNeg[i].cbParamValue);
1409	if (RT_FAILURE(rc))
1410	break;
1411	}
1412	fParameterNeg = false;
1413	}
1414
1415	nsg = 3;
1416	transit = true;
1417	break;
1418	case 0x0300: /* full feature phase. */
1419	default:
1420	/* Should never come here. */
1421	AssertMsgFailed(("send: Undefined login state %d substate %d\n", csg, substate));
1422	break;
1423	}
1424
1425	if (RT_FAILURE(rc))
1426	break;
1427
1428	aReqBHS[0] = RT_H2N_U32( ISCSI_IMMEDIATE_DELIVERY_BIT
1429	\| (csg << ISCSI_CSG_SHIFT)
1430	\| (transit ? (nsg << ISCSI_NSG_SHIFT \| ISCSI_TRANSIT_BIT) : 0)
1431	\| ISCSI_MY_VERSION /* Minimum version. */
1432	\| (ISCSI_MY_VERSION << 8) /* Maximum version. */
1433	\| ISCSIOP_LOGIN_REQ); /* C=0 */
1434	aReqBHS[1] = RT_H2N_U32((uint32_t)cbBuf); /* TotalAHSLength=0 */
1435	aReqBHS[2] = RT_H2N_U32(isid_tsih >> 32);
1436	aReqBHS[3] = RT_H2N_U32(isid_tsih & 0xffffffff);
1437	aReqBHS[4] = itt;
1438	aReqBHS[5] = RT_H2N_U32(1 << 16); /* CID=1,reserved */
1439	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1440	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1441	aReqBHS[8] = 0; /* reserved */
1442	aReqBHS[9] = 0; /* reserved */
1443	aReqBHS[10] = 0; /* reserved */
1444	aReqBHS[11] = 0; /* reserved */
1445
1446	cnISCSIReq = 0;
1447	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1448	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1449	cnISCSIReq++;
1450
1451	aISCSIReq[cnISCSIReq].pcvSeg = bBuf;
1452	aISCSIReq[cnISCSIReq].cbSeg = cbBuf;
1453	cnISCSIReq++;
1454
1455	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1456	if (RT_SUCCESS(rc))
1457	{
1458	ISCSIOPCODE cmd;
1459	ISCSILOGINSTATUSCLASS loginStatusClass;
1460
1461	cnISCSIRes = 0;
1462	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1463	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1464	cnISCSIRes++;
1465	aISCSIRes[cnISCSIRes].pvSeg = bBuf;
1466	aISCSIRes[cnISCSIRes].cbSeg = sizeof(bBuf);
1467	cnISCSIRes++;
1468
1469	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes, ISCSIPDU_NO_REATTACH);
1470	if (RT_FAILURE(rc))
1471	{
1472	/*
1473	* We lost connection to the target while receiving the answer,
1474	* start from the beginning.
1475	*/
1476	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
1477	rc = VERR_TRY_AGAIN;
1478	break;
1479	}
1480
1481	/** @todo collect partial login responses with Continue bit set. */
1482	Assert(aISCSIRes[0].pvSeg == aResBHS);
1483	Assert(aISCSIRes[0].cbSeg >= ISCSI_BHS_SIZE);
1484	Assert((RT_N2H_U32(aResBHS[0]) & ISCSI_CONTINUE_BIT) == 0);
1485
1486	cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1487	if (cmd == ISCSIOP_LOGIN_RES)
1488	{
1489	if ((RT_N2H_U32(aResBHS[0]) & 0xff) != ISCSI_MY_VERSION)
1490	{
1491	iscsiTransportClose(pImage);
1492	rc = VERR_PARSE_ERROR;
1493	break; /* Give up immediately, as a RFC violation in version fields is very serious. */
1494	}
1495
1496	loginStatusClass = (ISCSILOGINSTATUSCLASS)(RT_N2H_U32(aResBHS[9]) >> 24);
1497	switch (loginStatusClass)
1498	{
1499	case ISCSI_LOGIN_STATUS_CLASS_SUCCESS:
1500	uint32_t targetCSG;
1501	uint32_t targetNSG;
1502	bool targetTransit;
1503
1504	if (pImage->FirstRecvPDU)
1505	{
1506	pImage->FirstRecvPDU = false;
1507	pImage->ExpStatSN = RT_N2H_U32(aResBHS[6]) + 1;
1508	}
1509
1510	targetCSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_CSG_MASK) >> ISCSI_CSG_SHIFT;
1511	targetNSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_NSG_MASK) >> ISCSI_NSG_SHIFT;
1512	targetTransit = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_TRANSIT_BIT);
1513
1514	/* Handle all cases with a single switch statement. */
1515	switch (csg << 8 \| substate)
1516	{
1517	case 0x0000: /* security negotiation, step 0: receive final authentication. */
1518	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1519	if (RT_FAILURE(rc))
1520	break;
1521
1522	const char *pcszAuthMethod;
1523
1524	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "AuthMethod", &pcszAuthMethod);
1525	if (RT_FAILURE(rc))
1526	{
1527	rc = VERR_PARSE_ERROR;
1528	break;
1529	}
1530	if (strcmp(pcszAuthMethod, "None") == 0)
1531	{
1532	/* Authentication offered, but none required. Skip to operational parameters. */
1533	csg = 1;
1534	nsg = 1;
1535	transit = true;
1536	substate = 0;
1537	break;
1538	}
1539	else if (strcmp(pcszAuthMethod, "CHAP") == 0 && targetNSG == 0 && !targetTransit)
1540	{
1541	/* CHAP authentication required, continue with next substate. */
1542	substate++;
1543	break;
1544	}
1545
1546	/* Unknown auth method or login response PDU headers incorrect. */
1547	rc = VERR_PARSE_ERROR;
1548	break;
1549	case 0x0001: /* security negotiation, step 1: receive final CHAP variant and challenge. */
1550	{
1551	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1552	if (RT_FAILURE(rc))
1553	break;
1554
1555	const char *pcszChapAuthMethod;
1556	const char *pcszChapIdxTarget;
1557	const char *pcszChapChallengeStr;
1558
1559	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_A", &pcszChapAuthMethod);
1560	if (RT_FAILURE(rc))
1561	{
1562	rc = VERR_PARSE_ERROR;
1563	break;
1564	}
1565	if (strcmp(pcszChapAuthMethod, "5") != 0)
1566	{
1567	rc = VERR_PARSE_ERROR;
1568	break;
1569	}
1570	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_I", &pcszChapIdxTarget);
1571	if (RT_FAILURE(rc))
1572	{
1573	rc = VERR_PARSE_ERROR;
1574	break;
1575	}
1576	rc = RTStrToUInt8Ex(pcszChapIdxTarget, &pszNext, 0, &bChapIdx);
1577	/** @todo r=bird: Unsafe use of pszNext on failure. The code should probably
1578	* use RTStrToUInt8Full and check for rc != VINF_SUCCESS. */
1579	if (rc > VINF_SUCCESS \|\| *pszNext != '\0')
1580	{
1581	rc = VERR_PARSE_ERROR;
1582	break;
1583	}
1584	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_C", &pcszChapChallengeStr);
1585	if (RT_FAILURE(rc))
1586	{
1587	rc = VERR_PARSE_ERROR;
1588	break;
1589	}
1590	cbChallenge = sizeof(pbChallenge);
1591	rc = iscsiStrToBinary(pcszChapChallengeStr, pbChallenge, &cbChallenge);
1592	if (RT_FAILURE(rc))
1593	break;
1594	substate++;
1595	transit = true;
1596	break;
1597	}
1598	case 0x0002: /* security negotiation, step 2: check authentication success. */
1599	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1600	if (RT_FAILURE(rc))
1601	break;
1602
1603	if (targetCSG == 0 && targetNSG == 1 && targetTransit)
1604	{
1605	/* Target wants to continue in login operational state, authentication success. */
1606	csg = 1;
1607	nsg = 3;
1608	substate = 0;
1609	break;
1610	}
1611	rc = VERR_PARSE_ERROR;
1612	break;
1613	case 0x0100: /* login operational negotiation, step 0: check results. */
1614	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1615	if (RT_FAILURE(rc))
1616	break;
1617
1618	if (targetCSG == 1 && targetNSG == 3 && targetTransit)
1619	{
1620	/* Target wants to continue in full feature phase, login finished. */
1621	csg = 3;
1622	nsg = 3;
1623	substate = 0;
1624	break;
1625	}
1626	else if (targetCSG == 1 && (targetNSG == 1 \|\| !targetTransit))
1627	{
1628	/* Target wants to negotiate certain parameters and
1629	* stay in login operational negotiation. */
1630	csg = 1;
1631	nsg = 3;
1632	substate = 0;
1633	break;
1634	}
1635	rc = VERR_PARSE_ERROR;
1636	break;
1637	case 0x0300: /* full feature phase. */
1638	default:
1639	AssertMsgFailed(("recv: Undefined login state %d substate %d\n", csg, substate));
1640	rc = VERR_PARSE_ERROR;
1641	break;
1642	}
1643	break;
1644	case ISCSI_LOGIN_STATUS_CLASS_REDIRECTION:
1645	const char *pcszTargetRedir;
1646
1647	/* Target has moved to some other location, as indicated in the TargetAddress key. */
1648	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "TargetAddress", &pcszTargetRedir);
1649	if (RT_FAILURE(rc))
1650	{
1651	rc = VERR_PARSE_ERROR;
1652	break;
1653	}
1654	if (pImage->pszTargetAddress)
1655	RTMemFree(pImage->pszTargetAddress);
1656	{
1657	size_t cb = strlen(pcszTargetRedir) + 1;
1658	pImage->pszTargetAddress = (char *)RTMemAlloc(cb);
1659	if (!pImage->pszTargetAddress)
1660	{
1661	rc = VERR_NO_MEMORY;
1662	break;
1663	}
1664	memcpy(pImage->pszTargetAddress, pcszTargetRedir, cb);
1665	}
1666	rc = VINF_TRY_AGAIN;
1667	break;
1668	case ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR:
1669	{
1670	LogRel(("iSCSI: login to target failed with: %s\n",
1671	iscsiGetLoginErrorDetail((RT_N2H_U32(aResBHS[9]) >> 16) & 0xff)));
1672	iscsiTransportClose(pImage);
1673	rc = VERR_IO_GEN_FAILURE;
1674	break;
1675	}
1676	case ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR:
1677	iscsiTransportClose(pImage);
1678	rc = VINF_EOF;
1679	break;
1680	default:
1681	rc = VERR_PARSE_ERROR;
1682	}
1683
1684	if (RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN)
1685	break;
1686
1687	if (csg == 3)
1688	{
1689	/*
1690	* Finished login, continuing with Full Feature Phase.
1691	*/
1692	rc = VINF_SUCCESS;
1693	break;
1694	}
1695	}
1696	else
1697	AssertMsgFailed(("%s: ignoring unexpected PDU with first word = %#08x\n", __FUNCTION__, RT_N2H_U32(aResBHS[0])));
1698	}
1699	else
1700	break;
1701	} while (true);
1702
1703	if ( RT_FAILURE(rc)
1704	&& rc != VERR_TRY_AGAIN)
1705	{
1706	/*
1707	* Dump the last request and response of we are supposed to do so and there is a request
1708	* or response.
1709	*/
1710	if (cnISCSIReq)
1711	iscsiDumpPacket(pImage, aISCSIReq, cnISCSIReq, VINF_SUCCESS, true /* fRequest */);
1712
1713	if (cnISCSIRes)
1714	iscsiDumpPacket(pImage, (PISCSIREQ)aISCSIRes, cnISCSIRes, rc, false /* fRequest */);
1715
1716	/*
1717	* Close connection to target.
1718	*/
1719	iscsiTransportClose(pImage);
1720	pImage->state = ISCSISTATE_FREE;
1721	}
1722	else if (rc == VINF_SUCCESS)
1723	pImage->state = ISCSISTATE_NORMAL;
1724
1725	return rc;
1726	}
1727
1728	/**
1729	* Attach to an iSCSI target. Performs all operations necessary to enter
1730	* Full Feature Phase.
1731	*
1732	* @returns VBox status code.
1733	* @param pvUser The iSCSI connection state to be used as opaque user data.
1734	*/
1735	static DECLCALLBACK(int) iscsiAttach(void *pvUser)
1736	{
1737	int rc = VINF_SUCCESS;
1738	unsigned cRetries = 5;
1739	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1740
1741	LogFlowFunc(("entering\n"));
1742
1743	Assert(pImage->state == ISCSISTATE_FREE);
1744
1745	/*
1746	* If there were too many logins without any successful I/O just fail
1747	* and assume the target is not working properly.
1748	*/
1749	if (ASMAtomicReadU32(&pImage->cLoginsSinceIo) == 3)
1750	return VERR_BROKEN_PIPE;
1751
1752	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1753
1754	/* Make 100% sure the connection isn't reused for a new login. */
1755	iscsiTransportClose(pImage);
1756
1757	/* Try to log in a few number of times. */
1758	while (cRetries > 0)
1759	{
1760	rc = iscsiLogin(pImage);
1761	if (rc == VINF_SUCCESS) /* Login succeeded, continue with full feature phase. */
1762	break;
1763	else if (rc == VERR_TRY_AGAIN) /* Lost connection during receive. */
1764	cRetries--;
1765	else if (RT_FAILURE(rc))
1766	break;
1767	else /* For redirects try again. */
1768	AssertMsg(rc == VINF_TRY_AGAIN, ("Unexpected status code %Rrc\n", rc));
1769	}
1770
1771	if (RT_SUCCESS(rc))
1772	ASMAtomicIncU32(&pImage->cLoginsSinceIo);
1773
1774	RTSemMutexRelease(pImage->Mutex);
1775
1776	LogFlowFunc(("returning %Rrc\n", rc));
1777	LogRel(("iSCSI: login to target %s %s (%Rrc)\n", pImage->pszTargetName, RT_SUCCESS(rc) ? "successful" : "failed", rc));
1778	return rc;
1779	}
1780
1781
1782	/**
1783	* Detach from an iSCSI target.
1784	*
1785	* @returns VBox status code.
1786	* @param pvUser The iSCSI connection state to be used as opaque user data.
1787	*/
1788	static DECLCALLBACK(int) iscsiDetach(void *pvUser)
1789	{
1790	int rc;
1791	uint32_t itt;
1792	uint32_t cnISCSIReq = 0;
1793	ISCSIREQ aISCSIReq[4];
1794	uint32_t aReqBHS[12];
1795	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1796
1797	LogFlowFunc(("entering\n"));
1798
1799	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1800
1801	if (pImage->state != ISCSISTATE_FREE && pImage->state != ISCSISTATE_IN_LOGOUT)
1802	{
1803	pImage->state = ISCSISTATE_IN_LOGOUT;
1804
1805	/*
1806	* Send logout request to target.
1807	*/
1808	itt = iscsiNewITT(pImage);
1809	aReqBHS[0] = RT_H2N_U32(ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_REQ); /* I=0,F=1,Reason=close session */
1810	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
1811	aReqBHS[2] = 0; /* reserved */
1812	aReqBHS[3] = 0; /* reserved */
1813	aReqBHS[4] = itt;
1814	aReqBHS[5] = 0; /* reserved */
1815	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1816	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1817	aReqBHS[8] = 0; /* reserved */
1818	aReqBHS[9] = 0; /* reserved */
1819	aReqBHS[10] = 0; /* reserved */
1820	aReqBHS[11] = 0; /* reserved */
1821	pImage->CmdSN++;
1822
1823	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1824	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1825	cnISCSIReq++;
1826
1827	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1828	if (RT_SUCCESS(rc))
1829	{
1830	/*
1831	* Read logout response from target.
1832	*/
1833	ISCSIRES aISCSIRes;
1834	uint32_t aResBHS[12];
1835
1836	aISCSIRes.pvSeg = aResBHS;
1837	aISCSIRes.cbSeg = sizeof(aResBHS);
1838	rc = iscsiRecvPDU(pImage, itt, &aISCSIRes, 1, ISCSIPDU_NO_REATTACH);
1839	if (RT_SUCCESS(rc))
1840	{
1841	if (RT_N2H_U32(aResBHS[0]) != (ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_RES))
1842	AssertMsgFailed(("iSCSI Logout response invalid\n"));
1843	}
1844	else
1845	AssertMsgFailed(("iSCSI Logout response error, rc=%Rrc\n", rc));
1846	}
1847	else
1848	AssertMsgFailed(("Could not send iSCSI Logout request, rc=%Rrc\n", rc));
1849	}
1850
1851	if (pImage->state != ISCSISTATE_FREE)
1852	{
1853	/*
1854	* Close connection to target.
1855	*/
1856	rc = iscsiTransportClose(pImage);
1857	if (RT_FAILURE(rc))
1858	AssertMsgFailed(("Could not close connection to target, rc=%Rrc\n", rc));
1859	}
1860
1861	pImage->state = ISCSISTATE_FREE;
1862
1863	RTSemMutexRelease(pImage->Mutex);
1864
1865	LogFlowFunc(("leaving\n"));
1866	LogRel(("iSCSI: logout to target %s\n", pImage->pszTargetName));
1867	return VINF_SUCCESS;
1868	}
1869
1870
1871	/**
1872	* Perform a command on an iSCSI target. Target must be already in
1873	* Full Feature Phase.
1874	*
1875	* @returns VBox status code.
1876	* @param pImage The iSCSI connection state to be used.
1877	* @param pRequest Command descriptor. Contains all information about
1878	* the command, its transfer directions and pointers
1879	* to the buffer(s) used for transferring data and
1880	* status information.
1881	*/
1882	static int iscsiCommand(PISCSIIMAGE pImage, PSCSIREQ pRequest)
1883	{
1884	int rc;
1885	uint32_t itt;
1886	uint32_t cbData;
1887	uint32_t cnISCSIReq = 0;
1888	ISCSIREQ aISCSIReq[4];
1889	uint32_t aReqBHS[12];
1890
1891	uint32_t *pDst = NULL;
1892	size_t cbBufLength;
1893	uint32_t aStatus[256]; /*< Plenty of buffer for status information. /
1894	uint32_t ExpDataSN = 0;
1895	bool final = false;
1896
1897
1898	LogFlowFunc(("entering, CmdSN=%d\n", pImage->CmdSN));
1899
1900	Assert(pRequest->enmXfer != SCSIXFER_TO_FROM_TARGET); /*< @todo not yet supported, would require AHS. /
1901	Assert(pRequest->cbI2TData <= 0xffffff); /* larger transfers would require R2T support. */
1902	Assert(pRequest->cbCDB <= 16); /* would cause buffer overrun below. */
1903
1904	/* If not in normal state, then the transport connection was dropped. Try
1905	* to reestablish by logging in, the target might be responsive again. */
1906	if (pImage->state == ISCSISTATE_FREE)
1907	rc = iscsiAttach(pImage);
1908
1909	/* If still not in normal state, then the underlying transport connection
1910	* cannot be established. Get out before bad things happen (and make
1911	* sure the caller suspends the VM again). */
1912	if (pImage->state == ISCSISTATE_NORMAL)
1913	{
1914	/*
1915	* Send SCSI command to target with all I2T data included.
1916	*/
1917	cbData = 0;
1918	if (pRequest->enmXfer == SCSIXFER_FROM_TARGET)
1919	cbData = (uint32_t)pRequest->cbT2IData;
1920	else
1921	cbData = (uint32_t)pRequest->cbI2TData;
1922
1923	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1924
1925	itt = iscsiNewITT(pImage);
1926	memset(aReqBHS, 0, sizeof(aReqBHS));
1927	aReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_SIMPLE \| ISCSIOP_SCSI_CMD
1928	\| (pRequest->enmXfer << 21)); /* I=0,F=1,Attr=Simple */
1929	aReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pRequest->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
1930	aReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
1931	aReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
1932	aReqBHS[4] = itt;
1933	aReqBHS[5] = RT_H2N_U32(cbData);
1934	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1935	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1936	memcpy(aReqBHS + 8, pRequest->abCDB, pRequest->cbCDB);
1937	pImage->CmdSN++;
1938
1939	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1940	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1941	cnISCSIReq++;
1942
1943	if ( pRequest->enmXfer == SCSIXFER_TO_TARGET
1944	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1945	{
1946	Assert(pRequest->cI2TSegs == 1);
1947	aISCSIReq[cnISCSIReq].pcvSeg = pRequest->paI2TSegs[0].pvSeg;
1948	aISCSIReq[cnISCSIReq].cbSeg = pRequest->paI2TSegs[0].cbSeg; /* Padding done by transport. */
1949	cnISCSIReq++;
1950	}
1951
1952	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_DEFAULT);
1953	if (RT_SUCCESS(rc))
1954	{
1955	/* Place SCSI request in queue. */
1956	pImage->paCurrReq = aISCSIReq;
1957	pImage->cnCurrReq = cnISCSIReq;
1958
1959	/*
1960	* Read SCSI response/data in PDUs from target.
1961	*/
1962	if ( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1963	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1964	{
1965	Assert(pRequest->cT2ISegs == 1);
1966	pDst = (uint32_t *)pRequest->paT2ISegs[0].pvSeg;
1967	cbBufLength = pRequest->paT2ISegs[0].cbSeg;
1968	}
1969	else
1970	cbBufLength = 0;
1971
1972	do
1973	{
1974	uint32_t cnISCSIRes = 0;
1975	ISCSIRES aISCSIRes[4];
1976	uint32_t aResBHS[12];
1977
1978	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1979	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1980	cnISCSIRes++;
1981	if (cbBufLength != 0 &&
1982	( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1983	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET))
1984	{
1985	aISCSIRes[cnISCSIRes].pvSeg = pDst;
1986	aISCSIRes[cnISCSIRes].cbSeg = cbBufLength;
1987	cnISCSIRes++;
1988	}
1989	/* Always reserve space for the status - it's impossible to tell
1990	* beforehand whether this will be the final PDU or not. */
1991	aISCSIRes[cnISCSIRes].pvSeg = aStatus;
1992	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aStatus);
1993	cnISCSIRes++;
1994
1995	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes, ISCSIPDU_DEFAULT);
1996	if (RT_FAILURE(rc))
1997	break;
1998
1999	final = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_FINAL_BIT);
2000	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
2001	if (cmd == ISCSIOP_SCSI_RES)
2002	{
2003	/* This is the final PDU which delivers the status (and may be omitted if
2004	* the last Data-In PDU included successful completion status). Note
2005	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
2006	if (!final \|\| ((RT_N2H_U32(aResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(aResBHS[6]) != pImage->ExpStatSN - 1))
2007	{
2008	/* SCSI Response in the wrong place or with a (target) failure. */
2009	rc = VERR_PARSE_ERROR;
2010	break;
2011	}
2012	/* The following is a bit tricky, as in error situations we may
2013	* get the status only instead of the result data plus optional
2014	* status. Thus the status may have ended up partially in the
2015	* data area. */
2016	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
2017	cbData = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
2018	if (cbData >= 2)
2019	{
2020	uint32_t cbStat = RT_N2H_U32(((uint32_t *)aISCSIRes[1].pvSeg)[0]) >> 16;
2021	if (cbStat + 2 > cbData)
2022	{
2023	rc = VERR_BUFFER_OVERFLOW;
2024	break;
2025	}
2026	/* Truncate sense data if it doesn't fit into the buffer. */
2027	pRequest->cbSense = RT_MIN(cbStat, pRequest->cbSense);
2028	memcpy(pRequest->abSense,
2029	((const char *)aISCSIRes[1].pvSeg) + 2,
2030	RT_MIN(aISCSIRes[1].cbSeg - 2, pRequest->cbSense));
2031	if ( cnISCSIRes > 2 && aISCSIRes[2].cbSeg
2032	&& (ssize_t)pRequest->cbSense - aISCSIRes[1].cbSeg + 2 > 0)
2033	{
2034	memcpy((char *)pRequest->abSense + aISCSIRes[1].cbSeg - 2,
2035	aISCSIRes[2].pvSeg,
2036	pRequest->cbSense - aISCSIRes[1].cbSeg + 2);
2037	}
2038	}
2039	else if (cbData == 1)
2040	{
2041	rc = VERR_PARSE_ERROR;
2042	break;
2043	}
2044	else
2045	pRequest->cbSense = 0;
2046	break;
2047	}
2048	else if (cmd == ISCSIOP_SCSI_DATA_IN)
2049	{
2050	/* A Data-In PDU carries some data that needs to be added to the received
2051	* data in response to the command. There may be both partial and complete
2052	* Data-In PDUs, so collect data until the status is included or the status
2053	* is sent in a separate SCSI Result frame (see above). */
2054	if (final && aISCSIRes[2].cbSeg != 0)
2055	{
2056	/* The received PDU is partially stored in the buffer for status.
2057	* Must not happen under normal circumstances and is a target error. */
2058	rc = VERR_BUFFER_OVERFLOW;
2059	break;
2060	}
2061	uint32_t len = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
2062	pDst = (uint32_t )((char )pDst + len);
2063	cbBufLength -= len;
2064	ExpDataSN++;
2065	if (final && (RT_N2H_U32(aResBHS[0]) & ISCSI_STATUS_BIT) != 0)
2066	{
2067	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
2068	pRequest->cbSense = 0;
2069	break;
2070	}
2071	}
2072	else
2073	{
2074	rc = VERR_PARSE_ERROR;
2075	break;
2076	}
2077	} while (true);
2078
2079	/* Remove SCSI request from queue. */
2080	pImage->paCurrReq = NULL;
2081	pImage->cnCurrReq = 0;
2082	}
2083
2084	if (rc == VERR_TIMEOUT)
2085	{
2086	/* Drop connection in case the target plays dead. Much better than
2087	* delaying the next requests until the timed out command actually
2088	* finishes. Also keep in mind that command shouldn't take longer than
2089	* about 30-40 seconds, or the guest will lose its patience. */
2090	iscsiTransportClose(pImage);
2091	pImage->state = ISCSISTATE_FREE;
2092	rc = VERR_BROKEN_PIPE;
2093	}
2094	RTSemMutexRelease(pImage->Mutex);
2095	}
2096	else
2097	rc = VERR_NET_CONNECTION_REFUSED;
2098
2099	if (RT_SUCCESS(rc))
2100	ASMAtomicWriteU32(&pImage->cLoginsSinceIo, 0);
2101	LogFlowFunc(("returns %Rrc\n", rc));
2102	return rc;
2103	}
2104
2105
2106	/**
2107	* Generate a new Initiator Task Tag.
2108	*
2109	* @returns Initiator Task Tag.
2110	* @param pImage The iSCSI connection state to be used.
2111	*/
2112	static uint32_t iscsiNewITT(PISCSIIMAGE pImage)
2113	{
2114	uint32_t next_itt;
2115
2116	next_itt = pImage->ITT++;
2117	if (pImage->ITT == ISCSI_TASK_TAG_RSVD)
2118	pImage->ITT = 0;
2119	return RT_H2N_U32(next_itt);
2120	}
2121
2122
2123	/**
2124	* Send an iSCSI request. The request can consist of several segments, which
2125	* are padded to 4 byte boundaries and concatenated.
2126	*
2127	* @returns VBOX status
2128	* @param pImage The iSCSI connection state to be used.
2129	* @param paReq Pointer to array of iSCSI request sections.
2130	* @param cnReq Number of valid iSCSI request sections in the array.
2131	* @param uFlags Flags controlling the exact send semantics.
2132	*/
2133	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq,
2134	uint32_t uFlags)
2135	{
2136	int rc = VINF_SUCCESS;
2137	/** @todo return VERR_VD_ISCSI_INVALID_STATE in the appropriate situations,
2138	* needs cleaning up of timeout/disconnect handling a bit, as otherwise
2139	* too many incorrect errors are signalled. */
2140	Assert(cnReq >= 1);
2141	Assert(paReq[0].cbSeg >= ISCSI_BHS_SIZE);
2142
2143	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
2144	{
2145	rc = iscsiTransportWrite(pImage, paReq, cnReq);
2146	if (RT_SUCCESS(rc))
2147	break;
2148	if ( (uFlags & ISCSIPDU_NO_REATTACH)
2149	\|\| (rc != VERR_BROKEN_PIPE && rc != VERR_NET_CONNECTION_REFUSED))
2150	break;
2151	/* No point in reestablishing the connection for a logout */
2152	if (pImage->state == ISCSISTATE_IN_LOGOUT)
2153	break;
2154	RTThreadSleep(500);
2155	if (pImage->state != ISCSISTATE_IN_LOGIN)
2156	{
2157	/* Attempt to re-login when a connection fails, but only when not
2158	* currently logging in. */
2159	rc = iscsiAttach(pImage);
2160	if (RT_FAILURE(rc))
2161	break;
2162	}
2163	}
2164	return rc;
2165	}
2166
2167
2168	/**
2169	* Wait for an iSCSI response with a matching Initiator Target Tag. The response is
2170	* split into several segments, as requested by the caller-provided buffer specification.
2171	* Remember that the response can be split into several PDUs by the sender, so make
2172	* sure that all parts are collected and processed appropriately by the caller.
2173	*
2174	* @returns VBOX status
2175	* @param pImage The iSCSI connection state to be used.
2176	* @param itt The initiator task tag.
2177	* @param paRes Pointer to array of iSCSI response sections.
2178	* @param cnRes Number of valid iSCSI response sections in the array.
2179	* @param fRecvFlags PDU receive flags.
2180	*/
2181	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes,
2182	uint32_t fRecvFlags)
2183	{
2184	int rc = VINF_SUCCESS;
2185	ISCSIRES aResBuf;
2186
2187	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
2188	{
2189	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2190	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2191	rc = iscsiTransportRead(pImage, &aResBuf, 1);
2192	if (RT_FAILURE(rc))
2193	{
2194	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
2195	{
2196	/* No point in reestablishing the connection for a logout */
2197	if (pImage->state == ISCSISTATE_IN_LOGOUT)
2198	break;
2199	/* Connection broken while waiting for a response - wait a while and
2200	* try to restart by re-sending the original request (if any).
2201	* This also handles the connection reestablishment (login etc.). */
2202	RTThreadSleep(500);
2203	if ( pImage->state != ISCSISTATE_IN_LOGIN
2204	&& !(fRecvFlags & ISCSIPDU_NO_REATTACH))
2205	{
2206	/* Attempt to re-login when a connection fails, but only when not
2207	* currently logging in. */
2208	rc = iscsiAttach(pImage);
2209	if (RT_FAILURE(rc))
2210	break;
2211
2212	if (pImage->paCurrReq != NULL)
2213	{
2214	rc = iscsiSendPDU(pImage, pImage->paCurrReq, pImage->cnCurrReq, ISCSIPDU_DEFAULT);
2215	if (RT_FAILURE(rc))
2216	break;
2217	}
2218	}
2219	}
2220	else
2221	{
2222	/* Signal other errors (VERR_BUFFER_OVERFLOW etc.) to the caller. */
2223	break;
2224	}
2225	}
2226	else
2227	{
2228	ISCSIOPCODE cmd;
2229	const uint32_t pcvResSeg = (const uint32_t )aResBuf.pvSeg;
2230
2231	/* Check whether the received PDU is valid, and update the internal state of
2232	* the iSCSI connection/session. */
2233	rc = iscsiValidatePDU(&aResBuf, 1);
2234	if (RT_FAILURE(rc))
2235	{
2236	iscsiDumpPacket(pImage, (PISCSIREQ)&aResBuf, 1, rc, false /* fRequest */);
2237	continue;
2238	}
2239	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2240	switch (cmd)
2241	{
2242	case ISCSIOP_SCSI_RES:
2243	case ISCSIOP_SCSI_TASKMGMT_RES:
2244	case ISCSIOP_SCSI_DATA_IN:
2245	case ISCSIOP_R2T:
2246	case ISCSIOP_ASYN_MSG:
2247	case ISCSIOP_TEXT_RES:
2248	case ISCSIOP_LOGIN_RES:
2249	case ISCSIOP_LOGOUT_RES:
2250	case ISCSIOP_REJECT:
2251	case ISCSIOP_NOP_IN:
2252	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2253	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2254	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2255	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2256	break;
2257	default:
2258	rc = VERR_PARSE_ERROR;
2259	iscsiDumpPacket(pImage, (PISCSIREQ)&aResBuf, 1, rc, false /* fRequest */);
2260	}
2261	if (RT_FAILURE(rc))
2262	continue;
2263	if ( !pImage->FirstRecvPDU
2264	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT))
2265	&& ( cmd != ISCSIOP_LOGIN_RES
2266	\|\| (ISCSILOGINSTATUSCLASS)((RT_N2H_U32(pcvResSeg[9]) >> 24) == ISCSI_LOGIN_STATUS_CLASS_SUCCESS)))
2267	{
2268	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2269	{
2270	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2271	if ( (cmd != ISCSIOP_R2T)
2272	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2273	pImage->ExpStatSN++;
2274	}
2275	else
2276	{
2277	rc = VERR_PARSE_ERROR;
2278	iscsiDumpPacket(pImage, (PISCSIREQ)&aResBuf, 1, rc, false /* fRequest */);
2279	continue;
2280	}
2281	}
2282	/* Finally check whether the received PDU matches what the caller wants. */
2283	if ( itt == pcvResSeg[4]
2284	&& itt != ISCSI_TASK_TAG_RSVD)
2285	{
2286	/* Copy received PDU (one segment) to caller-provided buffers. */
2287	uint32_t j;
2288	size_t cbSeg;
2289	const uint8_t *pSrc;
2290
2291	pSrc = (const uint8_t *)aResBuf.pvSeg;
2292	cbSeg = aResBuf.cbSeg;
2293	for (j = 0; j < cnRes; j++)
2294	{
2295	if (cbSeg > paRes[j].cbSeg)
2296	{
2297	memcpy(paRes[j].pvSeg, pSrc, paRes[j].cbSeg);
2298	pSrc += paRes[j].cbSeg;
2299	cbSeg -= paRes[j].cbSeg;
2300	}
2301	else
2302	{
2303	memcpy(paRes[j].pvSeg, pSrc, cbSeg);
2304	paRes[j].cbSeg = cbSeg;
2305	cbSeg = 0;
2306	break;
2307	}
2308	}
2309	if (cbSeg != 0)
2310	{
2311	rc = VERR_BUFFER_OVERFLOW;
2312	break;
2313	}
2314	for (j++; j < cnRes; j++)
2315	paRes[j].cbSeg = 0;
2316	break;
2317	}
2318	else if ( cmd == ISCSIOP_NOP_IN
2319	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2320	{
2321	uint32_t cnISCSIReq;
2322	ISCSIREQ aISCSIReq[4];
2323	uint32_t aReqBHS[12];
2324
2325	aReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2326	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2327	aReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2328	aReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2329	aReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2330	aReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2331	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2332	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2333	aReqBHS[8] = 0; /* reserved */
2334	aReqBHS[9] = 0; /* reserved */
2335	aReqBHS[10] = 0; /* reserved */
2336	aReqBHS[11] = 0; /* reserved */
2337
2338	cnISCSIReq = 0;
2339	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
2340	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
2341	cnISCSIReq++;
2342
2343	iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
2344	/* Break if the caller wanted to process the NOP-in only. */
2345	if (itt == ISCSI_TASK_TAG_RSVD)
2346	break;
2347	}
2348	}
2349	}
2350
2351	LogFlowFunc(("returns rc=%Rrc\n", rc));
2352	return rc;
2353	}
2354
2355
2356	/**
2357	* Reset the PDU buffer
2358	*
2359	* @param pImage The iSCSI connection state to be used.
2360	*/
2361	static void iscsiRecvPDUReset(PISCSIIMAGE pImage)
2362	{
2363	pImage->cbRecvPDUResidual = ISCSI_BHS_SIZE;
2364	pImage->fRecvPDUBHS = true;
2365	pImage->pbRecvPDUBufCur = (uint8_t *)pImage->pvRecvPDUBuf;
2366	}
2367
2368	static void iscsiPDUTxAdd(PISCSIIMAGE pImage, PISCSIPDUTX pIScsiPDUTx, bool fFront)
2369	{
2370	if (!fFront)
2371	{
2372	/* Insert PDU at the tail of the list. */
2373	if (!pImage->pIScsiPDUTxHead)
2374	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2375	else
2376	pImage->pIScsiPDUTxTail->pNext = pIScsiPDUTx;
2377	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2378	}
2379	else
2380	{
2381	/* Insert PDU at the beginning of the list. */
2382	pIScsiPDUTx->pNext = pImage->pIScsiPDUTxHead;
2383	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2384	if (!pImage->pIScsiPDUTxTail)
2385	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2386	}
2387	}
2388
2389	/**
2390	* Receives a PDU in a non blocking way.
2391	*
2392	* @returns VBOX status code.
2393	* @param pImage The iSCSI connection state to be used.
2394	*/
2395	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage)
2396	{
2397	size_t cbActuallyRead = 0;
2398	int rc = VINF_SUCCESS;
2399
2400	LogFlowFunc(("pImage=%#p\n", pImage));
2401
2402	/* Check if we are in the middle of a PDU receive. */
2403	if (pImage->cbRecvPDUResidual == 0)
2404	{
2405	/*
2406	* We are receiving a new PDU, don't read more than the BHS initially
2407	* until we know the real size of the PDU.
2408	*/
2409	iscsiRecvPDUReset(pImage);
2410	LogFlow(("Receiving new PDU\n"));
2411	}
2412
2413	rc = pImage->pIfNet->pfnReadNB(pImage->Socket, pImage->pbRecvPDUBufCur,
2414	pImage->cbRecvPDUResidual, &cbActuallyRead);
2415	if (RT_SUCCESS(rc) && cbActuallyRead == 0)
2416	rc = VERR_BROKEN_PIPE;
2417
2418	if (RT_SUCCESS(rc))
2419	{
2420	LogFlow(("Received %zu bytes\n", cbActuallyRead));
2421	pImage->cbRecvPDUResidual -= cbActuallyRead;
2422	pImage->pbRecvPDUBufCur += cbActuallyRead;
2423
2424	/* Check if we received everything we wanted. */
2425	if ( !pImage->cbRecvPDUResidual
2426	&& pImage->fRecvPDUBHS)
2427	{
2428	size_t cbAHSLength, cbDataLength;
2429
2430	/* If we were reading the BHS first get the actual PDU size now. */
2431	uint32_t word1 = RT_N2H_U32(((uint32_t *)(pImage->pvRecvPDUBuf))[1]);
2432	cbAHSLength = (word1 & 0xff000000) >> 24;
2433	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
2434	cbDataLength = word1 & 0x00ffffff;
2435	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
2436	pImage->cbRecvPDUResidual = cbAHSLength + cbDataLength;
2437	pImage->fRecvPDUBHS = false; /* Start receiving the rest of the PDU. */
2438	}
2439
2440	if (!pImage->cbRecvPDUResidual)
2441	{
2442	/* We received the complete PDU with or without any payload now. */
2443	LogFlow(("Received complete PDU\n"));
2444	ISCSIRES aResBuf;
2445	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2446	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2447	rc = iscsiRecvPDUProcess(pImage, &aResBuf, 1);
2448	}
2449	}
2450	else
2451	LogFlowFunc(("Reading from the socket returned with rc=%Rrc\n", rc));
2452
2453	return rc;
2454	}
2455
2456	static int iscsiSendPDUAsync(PISCSIIMAGE pImage)
2457	{
2458	size_t cbSent = 0;
2459	int rc = VINF_SUCCESS;
2460
2461	LogFlowFunc(("pImage=%#p\n", pImage));
2462
2463	do
2464	{
2465	/*
2466	* If there is no PDU active, get the first one from the list.
2467	* Check that we are allowed to transfer the PDU by comparing the
2468	* command sequence number and the maximum sequence number allowed by the target.
2469	*/
2470	if (!pImage->pIScsiPDUTxCur)
2471	{
2472	if ( !pImage->pIScsiPDUTxHead
2473	\|\| serial_number_greater(pImage->pIScsiPDUTxHead->CmdSN, pImage->MaxCmdSN))
2474	break;
2475
2476	pImage->pIScsiPDUTxCur = pImage->pIScsiPDUTxHead;
2477	pImage->pIScsiPDUTxHead = pImage->pIScsiPDUTxCur->pNext;
2478	if (!pImage->pIScsiPDUTxHead)
2479	pImage->pIScsiPDUTxTail = NULL;
2480	}
2481
2482	/* Send as much as we can. */
2483	rc = pImage->pIfNet->pfnSgWriteNB(pImage->Socket, &pImage->pIScsiPDUTxCur->SgBuf, &cbSent);
2484	LogFlow(("SgWriteNB returned rc=%Rrc cbSent=%zu\n", rc, cbSent));
2485	if (RT_SUCCESS(rc))
2486	{
2487	LogFlow(("Sent %zu bytes for PDU %#p\n", cbSent, pImage->pIScsiPDUTxCur));
2488	pImage->pIScsiPDUTxCur->cbSgLeft -= cbSent;
2489	RTSgBufAdvance(&pImage->pIScsiPDUTxCur->SgBuf, cbSent);
2490	if (!pImage->pIScsiPDUTxCur->cbSgLeft)
2491	{
2492	/* PDU completed, free it and place the command on the waiting for response list. */
2493	if (pImage->pIScsiPDUTxCur->pIScsiCmd)
2494	{
2495	LogFlow(("Sent complete PDU, placing on waiting list\n"));
2496	iscsiCmdInsert(pImage, pImage->pIScsiPDUTxCur->pIScsiCmd);
2497	}
2498	RTMemFree(pImage->pIScsiPDUTxCur);
2499	pImage->pIScsiPDUTxCur = NULL;
2500	}
2501	}
2502	} while ( RT_SUCCESS(rc)
2503	&& !pImage->pIScsiPDUTxCur);
2504
2505	if (rc == VERR_TRY_AGAIN)
2506	rc = VINF_SUCCESS;
2507
2508	/* Add the write poll flag if we still have something to send, clear it otherwise. */
2509	if (pImage->pIScsiPDUTxCur)
2510	pImage->fPollEvents \|= VD_INTERFACETCPNET_EVT_WRITE;
2511	else
2512	pImage->fPollEvents &= ~VD_INTERFACETCPNET_EVT_WRITE;
2513
2514	LogFlowFunc(("rc=%Rrc pIScsiPDUTxCur=%#p\n", rc, pImage->pIScsiPDUTxCur));
2515	return rc;
2516	}
2517
2518	/**
2519	* Process a received PDU.
2520	*
2521	* @return VBOX status code.
2522	* @param pImage The iSCSI connection state to be used.
2523	* @param paRes Pointer to the array of iSCSI response sections.
2524	* @param cnRes Number of valid iSCSI response sections in the array.
2525	*/
2526	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2527	{
2528	int rc = VINF_SUCCESS;
2529
2530	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2531
2532	/* Validate the PDU first. */
2533	rc = iscsiValidatePDU(paRes, cnRes);
2534	if (RT_SUCCESS(rc))
2535	{
2536	ISCSIOPCODE cmd;
2537	const uint32_t pcvResSeg = (const uint32_t )paRes[0].pvSeg;
2538
2539	Assert(paRes[0].cbSeg > 9 * sizeof(uint32_t));
2540
2541	do
2542	{
2543	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2544	switch (cmd)
2545	{
2546	case ISCSIOP_SCSI_RES:
2547	case ISCSIOP_SCSI_TASKMGMT_RES:
2548	case ISCSIOP_SCSI_DATA_IN:
2549	case ISCSIOP_R2T:
2550	case ISCSIOP_ASYN_MSG:
2551	case ISCSIOP_TEXT_RES:
2552	case ISCSIOP_LOGIN_RES:
2553	case ISCSIOP_LOGOUT_RES:
2554	case ISCSIOP_REJECT:
2555	case ISCSIOP_NOP_IN:
2556	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2557	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2558	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2559	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2560	break;
2561	default:
2562	rc = VERR_PARSE_ERROR;
2563	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2564	}
2565
2566	if (RT_FAILURE(rc))
2567	break;
2568
2569	if ( !pImage->FirstRecvPDU
2570	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT)))
2571	{
2572	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2573	{
2574	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2575	if ( (cmd != ISCSIOP_R2T)
2576	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2577	pImage->ExpStatSN++;
2578	}
2579	else
2580	{
2581	rc = VERR_PARSE_ERROR;
2582	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2583	break;
2584	}
2585	}
2586
2587	if (pcvResSeg[4] != ISCSI_TASK_TAG_RSVD)
2588	{
2589	/*
2590	* This is a response from the target for a request from the initiator.
2591	* Get the request and update its state.
2592	*/
2593	rc = iscsiRecvPDUUpdateRequest(pImage, paRes, cnRes);
2594	/* Try to send more PDUs now that we updated the MaxCmdSN field */
2595	if ( RT_SUCCESS(rc)
2596	&& !pImage->pIScsiPDUTxCur)
2597	rc = iscsiSendPDUAsync(pImage);
2598	}
2599	else
2600	{
2601	/* This is a target initiated request (we handle only NOP-In request at the moment). */
2602	if ( cmd == ISCSIOP_NOP_IN
2603	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2604	{
2605	PISCSIPDUTX pIScsiPDUTx;
2606	uint32_t cnISCSIReq;
2607	uint32_t *paReqBHS;
2608
2609	LogFlowFunc(("Sending NOP-Out\n"));
2610
2611	/* Allocate a new PDU initialize it and put onto the waiting list. */
2612	pIScsiPDUTx = (PISCSIPDUTX)RTMemAllocZ(sizeof(ISCSIPDUTX));
2613	if (!pIScsiPDUTx)
2614	{
2615	rc = VERR_NO_MEMORY;
2616	break;
2617	}
2618	paReqBHS = &pIScsiPDUTx->aBHS[0];
2619	paReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2620	paReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2621	paReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2622	paReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2623	paReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2624	paReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2625	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2626	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2627	paReqBHS[8] = 0; /* reserved */
2628	paReqBHS[9] = 0; /* reserved */
2629	paReqBHS[10] = 0; /* reserved */
2630	paReqBHS[11] = 0; /* reserved */
2631
2632	cnISCSIReq = 0;
2633	pIScsiPDUTx->aISCSIReq[cnISCSIReq].pvSeg = paReqBHS;
2634	pIScsiPDUTx->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDUTx->aBHS);
2635	cnISCSIReq++;
2636	pIScsiPDUTx->cbSgLeft = sizeof(pIScsiPDUTx->aBHS);
2637	RTSgBufInit(&pIScsiPDUTx->SgBuf, pIScsiPDUTx->aISCSIReq, cnISCSIReq);
2638
2639	/*
2640	* Link the PDU to the list.
2641	* Insert at the front of the list to send the response as soon as possible
2642	* to avoid frequent reconnects for a slow connection when there are many PDUs
2643	* waiting.
2644	*/
2645	iscsiPDUTxAdd(pImage, pIScsiPDUTx, true /* fFront */);
2646
2647	/* Start transfer of a PDU if there is no one active at the moment. */
2648	if (!pImage->pIScsiPDUTxCur)
2649	rc = iscsiSendPDUAsync(pImage);
2650	}
2651	}
2652	} while (0);
2653	}
2654	else
2655	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2656
2657	return rc;
2658	}
2659
2660	/**
2661	* Check the static (not dependent on the connection/session state) validity of an iSCSI response PDU.
2662	*
2663	* @returns VBOX status
2664	* @param paRes Pointer to array of iSCSI response sections.
2665	* @param cnRes Number of valid iSCSI response sections in the array.
2666	*/
2667	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes)
2668	{
2669	RT_NOREF1(cnRes);
2670	const uint32_t *pcrgResBHS;
2671	uint32_t hw0;
2672	Assert(cnRes >= 1);
2673	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2674
2675	LogFlowFunc(("paRes=%#p cnRes=%u\n", paRes, cnRes));
2676
2677	pcrgResBHS = (const uint32_t *)(paRes[0].pvSeg);
2678	hw0 = RT_N2H_U32(pcrgResBHS[0]);
2679	switch (hw0 & ISCSIOP_MASK)
2680	{
2681	case ISCSIOP_NOP_IN:
2682	/* NOP-In responses must not be split into several PDUs nor it may contain
2683	* ping data for target-initiated pings nor may both task tags be valid task tags. */
2684	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2685	\|\| ( RT_N2H_U32(pcrgResBHS[4]) == ISCSI_TASK_TAG_RSVD
2686	&& RT_N2H_U32(pcrgResBHS[1]) != 0)
2687	\|\| ( RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD
2688	&& RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD))
2689	return VERR_PARSE_ERROR;
2690	break;
2691	case ISCSIOP_SCSI_RES:
2692	/* SCSI responses must not be split into several PDUs nor must the residual
2693	* bits be contradicting each other nor may the residual bits be set for PDUs
2694	* containing anything else but a completed command response. Underflow
2695	* is no reason for declaring a PDU as invalid, as the target may choose
2696	* to return less data than we assume to get. */
2697	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2698	\|\| ((hw0 & ISCSI_BI_READ_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_BI_READ_RESIDUAL_UNFL_BIT))
2699	\|\| ((hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2700	\|\| ( ((hw0 & ISCSI_SCSI_RESPONSE_MASK) == 0)
2701	&& ((hw0 & ISCSI_SCSI_STATUS_MASK) == SCSI_STATUS_OK)
2702	&& (hw0 & ( ISCSI_BI_READ_RESIDUAL_OVFL_BIT \| ISCSI_BI_READ_RESIDUAL_UNFL_BIT
2703	\| ISCSI_RESIDUAL_OVFL_BIT))))
2704	return VERR_PARSE_ERROR;
2705	else
2706	LogFlowFunc(("good SCSI response, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
2707	break;
2708	case ISCSIOP_LOGIN_RES:
2709	/* Login responses must not contain contradicting transit and continue bits. */
2710	if ((hw0 & ISCSI_CONTINUE_BIT) && ((hw0 & ISCSI_TRANSIT_BIT) != 0))
2711	return VERR_PARSE_ERROR;
2712	break;
2713	case ISCSIOP_TEXT_RES:
2714	/* Text responses must not contain contradicting final and continue bits nor
2715	* may the final bit be set for PDUs containing a target transfer tag other than
2716	* the reserved transfer tag (and vice versa). */
2717	if ( (((hw0 & ISCSI_CONTINUE_BIT) && (hw0 & ISCSI_FINAL_BIT) != 0))
2718	\|\| (((hw0 & ISCSI_FINAL_BIT) && (RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD)))
2719	\|\| (((hw0 & ISCSI_FINAL_BIT) == 0) && (RT_N2H_U32(pcrgResBHS[5]) == ISCSI_TASK_TAG_RSVD)))
2720	return VERR_PARSE_ERROR;
2721	break;
2722	case ISCSIOP_SCSI_DATA_IN:
2723	/* SCSI Data-in responses must not contain contradicting residual bits when
2724	* status bit is set. */
2725	if ((hw0 & ISCSI_STATUS_BIT) && (hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2726	return VERR_PARSE_ERROR;
2727	break;
2728	case ISCSIOP_LOGOUT_RES:
2729	/* Logout responses must not have the final bit unset and may not contain any
2730	* data or additional header segments. */
2731	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2732	\|\| (RT_N2H_U32(pcrgResBHS[1]) != 0))
2733	return VERR_PARSE_ERROR;
2734	break;
2735	case ISCSIOP_ASYN_MSG:
2736	/* Asynchronous Messages must not have the final bit unset and may not contain
2737	* an initiator task tag. */
2738	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2739	\|\| (RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD))
2740	return VERR_PARSE_ERROR;
2741	break;
2742	case ISCSIOP_SCSI_TASKMGMT_RES:
2743	case ISCSIOP_R2T:
2744	case ISCSIOP_REJECT:
2745	default:
2746	/* Do some logging, ignore PDU. */
2747	LogFlowFunc(("ignore unhandled PDU, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
2748	return VERR_PARSE_ERROR;
2749	}
2750	/* A target must not send PDUs with MaxCmdSN less than ExpCmdSN-1. */
2751
2752	if (serial_number_less(RT_N2H_U32(pcrgResBHS[8]), RT_N2H_U32(pcrgResBHS[7])-1))
2753	return VERR_PARSE_ERROR;
2754
2755	return VINF_SUCCESS;
2756	}
2757
2758
2759	/**
2760	* Prepares a PDU to transfer for the given command and adds it to the list.
2761	*/
2762	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
2763	{
2764	int rc = VINF_SUCCESS;
2765	uint32_t *paReqBHS;
2766	size_t cbData = 0;
2767	size_t cbSegs = 0;
2768	PSCSIREQ pScsiReq;
2769	PISCSIPDUTX pIScsiPDU = NULL;
2770
2771	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p\n", pImage, pIScsiCmd));
2772
2773	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2774
2775	pIScsiCmd->Itt = iscsiNewITT(pImage);
2776	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2777
2778	if (pScsiReq->cT2ISegs)
2779	RTSgBufInit(&pScsiReq->SgBufT2I, pScsiReq->paT2ISegs, pScsiReq->cT2ISegs);
2780
2781	/*
2782	* Allocate twice as much entries as required for padding (worst case).
2783	* The additional segment is for the BHS.
2784	*/
2785	size_t cI2TSegs = 2*(pScsiReq->cI2TSegs + 1);
2786	pIScsiPDU = (PISCSIPDUTX)RTMemAllocZ(RT_UOFFSETOF_DYN(ISCSIPDUTX, aISCSIReq[cI2TSegs]));
2787	if (!pIScsiPDU)
2788	return VERR_NO_MEMORY;
2789
2790	pIScsiPDU->pIScsiCmd = pIScsiCmd;
2791
2792	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
2793	cbData = (uint32_t)pScsiReq->cbT2IData;
2794	else
2795	cbData = (uint32_t)pScsiReq->cbI2TData;
2796
2797	paReqBHS = pIScsiPDU->aBHS;
2798
2799	/* Setup the BHS. */
2800	paReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_SIMPLE \| ISCSIOP_SCSI_CMD
2801	\| (pScsiReq->enmXfer << 21)); /* I=0,F=1,Attr=Simple */
2802	paReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pScsiReq->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
2803	paReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
2804	paReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
2805	paReqBHS[4] = pIScsiCmd->Itt;
2806	paReqBHS[5] = RT_H2N_U32((uint32_t)cbData); Assert((uint32_t)cbData == cbData);
2807	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2808	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2809	memcpy(paReqBHS + 8, pScsiReq->abCDB, pScsiReq->cbCDB);
2810
2811	pIScsiPDU->CmdSN = pImage->CmdSN;
2812	pImage->CmdSN++;
2813
2814	/* Setup the S/G buffers. */
2815	uint32_t cnISCSIReq = 0;
2816	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDU->aBHS);
2817	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pIScsiPDU->aBHS;
2818	cnISCSIReq++;
2819	cbSegs = sizeof(pIScsiPDU->aBHS);
2820	/* Padding is not necessary for the BHS. */
2821
2822	if (pScsiReq->cbI2TData)
2823	{
2824	for (unsigned cSeg = 0; cSeg < pScsiReq->cI2TSegs; cSeg++)
2825	{
2826	Assert(cnISCSIReq < cI2TSegs);
2827	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = pScsiReq->paI2TSegs[cSeg].cbSeg;
2828	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pScsiReq->paI2TSegs[cSeg].pvSeg;
2829	cbSegs += pScsiReq->paI2TSegs[cSeg].cbSeg;
2830	cnISCSIReq++;
2831
2832	/* Add padding if necessary. */
2833	if (pScsiReq->paI2TSegs[cSeg].cbSeg & 3)
2834	{
2835	Assert(cnISCSIReq < cI2TSegs);
2836	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = &pImage->aPadding[0];
2837	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = 4 - (pScsiReq->paI2TSegs[cSeg].cbSeg & 3);
2838	cbSegs += pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg;
2839	cnISCSIReq++;
2840	}
2841	}
2842	}
2843
2844	pIScsiPDU->cISCSIReq = cnISCSIReq;
2845	pIScsiPDU->cbSgLeft = cbSegs;
2846	RTSgBufInit(&pIScsiPDU->SgBuf, pIScsiPDU->aISCSIReq, cnISCSIReq);
2847
2848	/* Link the PDU to the list. */
2849	iscsiPDUTxAdd(pImage, pIScsiPDU, false /* fFront */);
2850
2851	/* Start transfer of a PDU if there is no one active at the moment. */
2852	if (!pImage->pIScsiPDUTxCur)
2853	rc = iscsiSendPDUAsync(pImage);
2854
2855	return rc;
2856	}
2857
2858
2859	/**
2860	* Updates the state of a request from the PDU we received.
2861	*
2862	* @return VBox status code.
2863	* @param pImage iSCSI connection state to use.
2864	* @param paRes Pointer to array of iSCSI response sections.
2865	* @param cnRes Number of valid iSCSI response sections in the array.
2866	*/
2867	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2868	{
2869	int rc = VINF_SUCCESS;
2870	PISCSICMD pIScsiCmd;
2871	uint32_t *paResBHS;
2872
2873	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2874
2875	Assert(cnRes == 1);
2876	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2877
2878	paResBHS = (uint32_t *)paRes[0].pvSeg;
2879
2880	pIScsiCmd = iscsiCmdGetFromItt(pImage, paResBHS[4]);
2881
2882	if (pIScsiCmd)
2883	{
2884	bool final = false;
2885	PSCSIREQ pScsiReq;
2886
2887	LogFlow(("Found SCSI command %#p for Itt=%#u\n", pIScsiCmd, paResBHS[4]));
2888
2889	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2890	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2891
2892	final = !!(RT_N2H_U32(paResBHS[0]) & ISCSI_FINAL_BIT);
2893	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(paResBHS[0]) & ISCSIOP_MASK);
2894	if (cmd == ISCSIOP_SCSI_RES)
2895	{
2896	/* This is the final PDU which delivers the status (and may be omitted if
2897	* the last Data-In PDU included successful completion status). Note
2898	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
2899	if (!final \|\| ((RT_N2H_U32(paResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(paResBHS[6]) != pImage->ExpStatSN - 1))
2900	{
2901	/* SCSI Response in the wrong place or with a (target) failure. */
2902	LogFlow(("Wrong ExpStatSN value in PDU\n"));
2903	rc = VERR_PARSE_ERROR;
2904	}
2905	else
2906	{
2907	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2908	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2909	void pvSense = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2910
2911	if (cbData >= 2)
2912	{
2913	uint32_t cbStat = RT_N2H_U32(((uint32_t *)pvSense)[0]) >> 16;
2914	if (cbStat + 2 > cbData)
2915	{
2916	rc = VERR_BUFFER_OVERFLOW;
2917	}
2918	else
2919	{
2920	/* Truncate sense data if it doesn't fit into the buffer. */
2921	pScsiReq->cbSense = RT_MIN(cbStat, pScsiReq->cbSense);
2922	memcpy(pScsiReq->abSense, (uint8_t *)pvSense + 2,
2923	RT_MIN(paRes[0].cbSeg - ISCSI_BHS_SIZE - 2, pScsiReq->cbSense));
2924	}
2925	}
2926	else if (cbData == 1)
2927	rc = VERR_PARSE_ERROR;
2928	else
2929	pScsiReq->cbSense = 0;
2930	}
2931	iscsiCmdComplete(pImage, pIScsiCmd, rc);
2932	}
2933	else if (cmd == ISCSIOP_SCSI_DATA_IN)
2934	{
2935	/* A Data-In PDU carries some data that needs to be added to the received
2936	* data in response to the command. There may be both partial and complete
2937	* Data-In PDUs, so collect data until the status is included or the status
2938	* is sent in a separate SCSI Result frame (see above). */
2939	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2940	void pvData = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2941
2942	if (final && cbData > pScsiReq->cbT2IData)
2943	{
2944	/* The received PDU is bigger than what we requested.
2945	* Must not happen under normal circumstances and is a target error. */
2946	rc = VERR_BUFFER_OVERFLOW;
2947	}
2948	else
2949	{
2950	/* Copy data from the received PDU into the T2I segments. */
2951	size_t cbCopied = RTSgBufCopyFromBuf(&pScsiReq->SgBufT2I, pvData, cbData);
2952	Assert(cbCopied == cbData); NOREF(cbCopied);
2953
2954	if (final && (RT_N2H_U32(paResBHS[0]) & ISCSI_STATUS_BIT) != 0)
2955	{
2956	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2957	pScsiReq->cbSense = 0;
2958	iscsiCmdComplete(pImage, pIScsiCmd, VINF_SUCCESS);
2959	}
2960	}
2961	}
2962	else
2963	rc = VERR_PARSE_ERROR;
2964	}
2965
2966	/* Log any errors here but ignore the PDU. */
2967	if (RT_FAILURE(rc))
2968	{
2969	LogRel(("iSCSI: Received malformed PDU from target %s (rc=%Rrc), ignoring\n", pImage->pszTargetName, rc));
2970	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2971	rc = VINF_SUCCESS;
2972	}
2973
2974	return rc;
2975	}
2976
2977	/**
2978	* Appends a key-value pair to the buffer. Normal ASCII strings (cbValue == 0) and large binary values
2979	* of a given length (cbValue > 0) are directly supported. Other value types must be converted to ASCII
2980	* by the caller. Strings must be in UTF-8 encoding.
2981	*
2982	* @returns VBOX status
2983	* @param pbBuf Pointer to the key-value buffer.
2984	* @param cbBuf Length of the key-value buffer.
2985	* @param pcbBufCurr Currently used portion of the key-value buffer.
2986	* @param pcszKey Pointer to a string containing the key.
2987	* @param pcszValue Pointer to either a string containing the value or to a large binary value.
2988	* @param cbValue Length of the binary value if applicable.
2989	*/
2990	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char *pcszKey,
2991	const char *pcszValue, size_t cbValue)
2992	{
2993	size_t cbBufTmp = *pcbBufCurr;
2994	size_t cbKey = strlen(pcszKey);
2995	size_t cbValueEnc;
2996	uint8_t *pbCurr;
2997
2998	if (cbValue == 0)
2999	cbValueEnc = strlen(pcszValue);
3000	else
3001	cbValueEnc = cbValue * 2 + 2; /* 2 hex bytes per byte, 2 bytes prefix */
3002
3003	if (cbBuf < cbBufTmp + cbKey + 1 + cbValueEnc + 1)
3004	{
3005	/* Buffer would overflow, signal error. */
3006	return VERR_BUFFER_OVERFLOW;
3007	}
3008
3009	/*
3010	* Append a key=value pair (zero terminated string) to the end of the buffer.
3011	*/
3012	pbCurr = pbBuf + cbBufTmp;
3013	memcpy(pbCurr, pcszKey, cbKey);
3014	pbCurr += cbKey;
3015	*pbCurr++ = '=';
3016	if (cbValue == 0)
3017	{
3018	memcpy(pbCurr, pcszValue, cbValueEnc);
3019	pbCurr += cbValueEnc;
3020	}
3021	else
3022	{
3023	*pbCurr++ = '0';
3024	*pbCurr++ = 'x';
3025	for (uint32_t i = 0; i < cbValue; i++)
3026	{
3027	uint8_t b;
3028	b = pcszValue[i];
3029	*pbCurr++ = NUM_2_HEX(b >> 4);
3030	*pbCurr++ = NUM_2_HEX(b & 0xf);
3031	}
3032	}
3033	*pbCurr = '\0';
3034	*pcbBufCurr = cbBufTmp + cbKey + 1 + cbValueEnc + 1;
3035
3036	return VINF_SUCCESS;
3037	}
3038
3039
3040	/**
3041	* Retrieve the value for a given key from the key=value buffer.
3042	*
3043	* @returns VBox status code.
3044	* @param pbBuf Buffer containing key=value pairs.
3045	* @param cbBuf Length of buffer with key=value pairs.
3046	* @param pcszKey Pointer to key for which to retrieve the value.
3047	* @param ppcszValue Pointer to value string pointer.
3048	*/
3049	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue)
3050	{
3051	size_t cbKey = strlen(pcszKey);
3052
3053	while (cbBuf != 0)
3054	{
3055	size_t cbKeyValNull = strlen((const char *)pbBuf) + 1;
3056
3057	if (strncmp(pcszKey, (const char *)pbBuf, cbKey) == 0 && pbBuf[cbKey] == '=')
3058	{
3059	ppcszValue = (const char )(pbBuf + cbKey + 1);
3060	return VINF_SUCCESS;
3061	}
3062	pbBuf += cbKeyValNull;
3063	cbBuf -= cbKeyValNull;
3064	}
3065	return VERR_INVALID_NAME;
3066	}
3067
3068
3069	/**
3070	* Convert a long-binary value from a value string to the binary representation.
3071	*
3072	* @returns VBOX status
3073	* @param pcszValue Pointer to a string containing the textual value representation.
3074	* @param pbValue Pointer to the value buffer for the binary value.
3075	* @param pcbValue In: length of value buffer, out: actual length of binary value.
3076	*/
3077	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue)
3078	{
3079	size_t cbValue = *pcbValue;
3080	char c1, c2, c3, c4;
3081	Assert(cbValue >= 1);
3082
3083	if (strlen(pcszValue) < 3)
3084	return VERR_PARSE_ERROR;
3085	if (*pcszValue++ != '0')
3086	return VERR_PARSE_ERROR;
3087	switch (*pcszValue++)
3088	{
3089	case 'x':
3090	case 'X':
3091	if (strlen(pcszValue) & 1)
3092	{
3093	c1 = *pcszValue++;
3094	*pbValue++ = HEX_2_NUM(c1);
3095	cbValue--;
3096	}
3097	while (*pcszValue != '\0')
3098	{
3099	if (cbValue == 0)
3100	return VERR_BUFFER_OVERFLOW;
3101	c1 = *pcszValue++;
3102	if ((c1 < '0' \|\| c1 > '9') && (c1 < 'a' \|\| c1 > 'f') && (c1 < 'A' \|\| c1 > 'F'))
3103	return VERR_PARSE_ERROR;
3104	c2 = *pcszValue++;
3105	if ((c2 < '0' \|\| c2 > '9') && (c2 < 'a' \|\| c2 > 'f') && (c2 < 'A' \|\| c2 > 'F'))
3106	return VERR_PARSE_ERROR;
3107	*pbValue++ = (HEX_2_NUM(c1) << 4) \| HEX_2_NUM(c2);
3108	cbValue--;
3109	}
3110	*pcbValue -= cbValue;
3111	break;
3112	case 'b':
3113	case 'B':
3114	if ((strlen(pcszValue) & 3) != 0)
3115	return VERR_PARSE_ERROR;
3116	while (*pcszValue != '\0')
3117	{
3118	uint32_t temp;
3119	if (cbValue == 0)
3120	return VERR_BUFFER_OVERFLOW;
3121	c1 = *pcszValue++;
3122	if ((c1 < 'A' \|\| c1 > 'Z') && (c1 < 'a' \|\| c1 >'z') && (c1 < '0' \|\| c1 > '9') && (c1 != '+') && (c1 != '/'))
3123	return VERR_PARSE_ERROR;
3124	c2 = *pcszValue++;
3125	if ((c2 < 'A' \|\| c2 > 'Z') && (c2 < 'a' \|\| c2 >'z') && (c2 < '0' \|\| c2 > '9') && (c2 != '+') && (c2 != '/'))
3126	return VERR_PARSE_ERROR;
3127	c3 = *pcszValue++;
3128	if ((c3 < 'A' \|\| c3 > 'Z') && (c3 < 'a' \|\| c3 >'z') && (c3 < '0' \|\| c3 > '9') && (c3 != '+') && (c3 != '/') && (c3 != '='))
3129	return VERR_PARSE_ERROR;
3130	c4 = *pcszValue++;
3131	if ( (c3 == '=' && c4 != '=')
3132	\|\| ((c4 < 'A' \|\| c4 > 'Z') && (c4 < 'a' \|\| c4 >'z') && (c4 < '0' \|\| c4 > '9') && (c4 != '+') && (c4 != '/') && (c4 != '=')))
3133	return VERR_PARSE_ERROR;
3134	temp = (B64_2_NUM(c1) << 18) \| (B64_2_NUM(c2) << 12);
3135	if (c3 == '=') {
3136	if (*pcszValue != '\0')
3137	return VERR_PARSE_ERROR;
3138	*pbValue++ = temp >> 16;
3139	cbValue--;
3140	} else {
3141	temp \|= B64_2_NUM(c3) << 6;
3142	if (c4 == '=') {
3143	if (*pcszValue != '\0')
3144	return VERR_PARSE_ERROR;
3145	if (cbValue < 2)
3146	return VERR_BUFFER_OVERFLOW;
3147	*pbValue++ = temp >> 16;
3148	*pbValue++ = (temp >> 8) & 0xff;
3149	cbValue -= 2;
3150	}
3151	else
3152	{
3153	temp \|= B64_2_NUM(c4);
3154	if (cbValue < 3)
3155	return VERR_BUFFER_OVERFLOW;
3156	*pbValue++ = temp >> 16;
3157	*pbValue++ = (temp >> 8) & 0xff;
3158	*pbValue++ = temp & 0xff;
3159	cbValue -= 3;
3160	}
3161	}
3162	}
3163	*pcbValue -= cbValue;
3164	break;
3165	default:
3166	return VERR_PARSE_ERROR;
3167	}
3168	return VINF_SUCCESS;
3169	}
3170
3171
3172	/**
3173	* Retrieve the relevant parameter values and update the initiator state.
3174	*
3175	* @returns VBox status code.
3176	* @param pImage Current iSCSI initiator state.
3177	* @param pbBuf Buffer containing key=value pairs.
3178	* @param cbBuf Length of buffer with key=value pairs.
3179	*/
3180	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf)
3181	{
3182	int rc;
3183	const char *pcszMaxRecvDataSegmentLength = NULL;
3184	const char *pcszMaxBurstLength = NULL;
3185	const char *pcszFirstBurstLength = NULL;
3186	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxRecvDataSegmentLength", &pcszMaxRecvDataSegmentLength);
3187	if (rc == VERR_INVALID_NAME)
3188	rc = VINF_SUCCESS;
3189	if (RT_FAILURE(rc))
3190	return VERR_PARSE_ERROR;
3191	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxBurstLength", &pcszMaxBurstLength);
3192	if (rc == VERR_INVALID_NAME)
3193	rc = VINF_SUCCESS;
3194	if (RT_FAILURE(rc))
3195	return VERR_PARSE_ERROR;
3196	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "FirstBurstLength", &pcszFirstBurstLength);
3197	if (rc == VERR_INVALID_NAME)
3198	rc = VINF_SUCCESS;
3199	if (RT_FAILURE(rc))
3200	return VERR_PARSE_ERROR;
3201	if (pcszMaxRecvDataSegmentLength)
3202	{
3203	uint32_t cb = pImage->cbSendDataLength;
3204	rc = RTStrToUInt32Full(pcszMaxRecvDataSegmentLength, 0, &cb);
3205	AssertRC(rc);
3206	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3207	}
3208	if (pcszMaxBurstLength)
3209	{
3210	uint32_t cb = pImage->cbSendDataLength;
3211	rc = RTStrToUInt32Full(pcszMaxBurstLength, 0, &cb);
3212	AssertRC(rc);
3213	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3214	}
3215	if (pcszFirstBurstLength)
3216	{
3217	uint32_t cb = pImage->cbSendDataLength;
3218	rc = RTStrToUInt32Full(pcszFirstBurstLength, 0, &cb);
3219	AssertRC(rc);
3220	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3221	}
3222	return VINF_SUCCESS;
3223	}
3224
3225
3226	static bool serial_number_less(uint32_t s1, uint32_t s2)
3227	{
3228	return (s1 < s2 && s2 - s1 < 0x80000000) \|\| (s1 > s2 && s1 - s2 > 0x80000000);
3229	}
3230
3231	static bool serial_number_greater(uint32_t s1, uint32_t s2)
3232	{
3233	return (s1 < s2 && s2 - s1 > 0x80000000) \|\| (s1 > s2 && s1 - s2 < 0x80000000);
3234	}
3235
3236
3237	#ifdef IMPLEMENT_TARGET_AUTH
3238	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge)
3239	{
3240	uint8_t cbChallenge;
3241
3242	cbChallenge = RTrand_U8(CHAP_MD5_CHALLENGE_MIN, CHAP_MD5_CHALLENGE_MAX);
3243	RTrand_bytes(pbChallenge, cbChallenge);
3244	*pcbChallenge = cbChallenge;
3245	}
3246	#endif
3247
3248
3249	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
3250	const uint8_t *pbSecret, size_t cbSecret)
3251	{
3252	RTMD5CONTEXT ctx;
3253	uint8_t bId;
3254
3255	bId = id;
3256	RTMd5Init(&ctx);
3257	RTMd5Update(&ctx, &bId, 1);
3258	RTMd5Update(&ctx, pbSecret, cbSecret);
3259	RTMd5Update(&ctx, pbChallenge, cbChallenge);
3260	RTMd5Final(pbResponse, &ctx);
3261	}
3262
3263	/**
3264	* Internal. - Wrapper around the extended select callback of the net interface.
3265	*/
3266	DECLINLINE(int) iscsiIoThreadWait(PISCSIIMAGE pImage, RTMSINTERVAL cMillies, uint32_t fEvents, uint32_t *pfEvents)
3267	{
3268	return pImage->pIfNet->pfnSelectOneEx(pImage->Socket, fEvents, pfEvents, cMillies);
3269	}
3270
3271	/**
3272	* Internal. - Pokes a thread waiting for I/O.
3273	*/
3274	DECLINLINE(int) iscsiIoThreadPoke(PISCSIIMAGE pImage)
3275	{
3276	return pImage->pIfNet->pfnPoke(pImage->Socket);
3277	}
3278
3279	/**
3280	* Internal. - Get the next request from the queue.
3281	*/
3282	DECLINLINE(PISCSICMD) iscsiCmdGet(PISCSIIMAGE pImage)
3283	{
3284	int rc;
3285	PISCSICMD pIScsiCmd = NULL;
3286
3287	rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3288	AssertRC(rc);
3289
3290	pIScsiCmd = pImage->pScsiReqQueue;
3291	if (pIScsiCmd)
3292	{
3293	pImage->pScsiReqQueue = pIScsiCmd->pNext;
3294	pIScsiCmd->pNext = NULL;
3295	}
3296
3297	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3298	AssertRC(rc);
3299
3300	return pIScsiCmd;
3301	}
3302
3303
3304	/**
3305	* Internal. - Adds the given command to the queue.
3306	*/
3307	DECLINLINE(int) iscsiCmdPut(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
3308	{
3309	int rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3310	AssertRC(rc);
3311
3312	pIScsiCmd->pNext = pImage->pScsiReqQueue;
3313	pImage->pScsiReqQueue = pIScsiCmd;
3314
3315	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3316	AssertRC(rc);
3317
3318	iscsiIoThreadPoke(pImage);
3319
3320	return rc;
3321	}
3322
3323	/**
3324	* Internal. - Completes the request with the appropriate action.
3325	* Synchronous requests are completed with waking up the thread
3326	* and asynchronous ones by continuing the associated I/O context.
3327	*/
3328	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd)
3329	{
3330	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p rcCmd=%Rrc\n", pImage, pIScsiCmd, rcCmd));
3331
3332	/* Remove from the table first. */
3333	iscsiCmdRemove(pImage, pIScsiCmd->Itt);
3334
3335	/* Call completion callback. */
3336	pIScsiCmd->pfnComplete(pImage, rcCmd, pIScsiCmd->pvUser);
3337
3338	/* Free command structure. */
3339	#ifdef DEBUG
3340	memset(pIScsiCmd, 0xff, sizeof(ISCSICMD));
3341	#endif
3342	RTMemFree(pIScsiCmd);
3343	}
3344
3345	/**
3346	* Clears all RX/TX PDU states and returns the command for the current
3347	* pending TX PDU if existing.
3348	*
3349	* @returns Pointer to the iSCSI command for the current PDU transmitted or NULL
3350	* if none is waiting.
3351	* @param pImage iSCSI connection state.
3352	*/
3353	static PISCSICMD iscsiPDURxTxClear(PISCSIIMAGE pImage)
3354	{
3355	PISCSICMD pIScsiCmdHead = NULL;
3356	PISCSIPDUTX pIScsiPDUTx = NULL;
3357
3358	/* Reset PDU we are receiving. */
3359	iscsiRecvPDUReset(pImage);
3360
3361	/*
3362	* Abort all PDUs we are about to transmit,
3363	* the command need a new Itt if the relogin is successful.
3364	*/
3365	while (pImage->pIScsiPDUTxHead)
3366	{
3367	pIScsiPDUTx = pImage->pIScsiPDUTxHead;
3368	pImage->pIScsiPDUTxHead = pIScsiPDUTx->pNext;
3369
3370	PISCSICMD pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3371	if (pIScsiCmd)
3372	{
3373	/* Place on command list. */
3374	pIScsiCmd->pNext = pIScsiCmdHead;
3375	pIScsiCmdHead = pIScsiCmd;
3376	}
3377	RTMemFree(pIScsiPDUTx);
3378	}
3379
3380	/* Clear the tail pointer (safety precaution). */
3381	pImage->pIScsiPDUTxTail = NULL;
3382
3383	/* Clear the current PDU too. */
3384	if (pImage->pIScsiPDUTxCur)
3385	{
3386	pIScsiPDUTx = pImage->pIScsiPDUTxCur;
3387
3388	pImage->pIScsiPDUTxCur = NULL;
3389	PISCSICMD pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3390	if (pIScsiCmd)
3391	{
3392	pIScsiCmd->pNext = pIScsiCmdHead;
3393	pIScsiCmdHead = pIScsiCmd;
3394	}
3395	RTMemFree(pIScsiPDUTx);
3396	}
3397
3398	return pIScsiCmdHead;
3399	}
3400
3401	/**
3402	* Rests the iSCSI connection state and returns a list of iSCSI commands pending
3403	* when this was called.
3404	*
3405	* @returns Pointer to the head of the pending iSCSI command list.
3406	* @param pImage iSCSI connection state.
3407	*/
3408	static PISCSICMD iscsiReset(PISCSIIMAGE pImage)
3409	{
3410	PISCSICMD pIScsiCmdHead = NULL;
3411	PISCSICMD pIScsiCmdCur = NULL;
3412
3413	/* Clear all in flight PDUs. */
3414	pIScsiCmdHead = iscsiPDURxTxClear(pImage);
3415
3416	/*
3417	* Get all commands which are waiting for a response
3418	* They need to be resend too after a successful reconnect.
3419	*/
3420	PISCSICMD pIScsiCmd = iscsiCmdRemoveAll(pImage);
3421	if (pIScsiCmd)
3422	{
3423	pIScsiCmdCur = pIScsiCmd;
3424	while (pIScsiCmdCur->pNext)
3425	pIScsiCmdCur = pIScsiCmdCur->pNext;
3426
3427	/*
3428	* Place them in front of the list because they are the oldest requests
3429	* and need to be processed first to minimize the risk to time out.
3430	*/
3431	pIScsiCmdCur->pNext = pIScsiCmdHead;
3432	pIScsiCmdHead = pIScsiCmd;
3433	}
3434
3435	return pIScsiCmdHead;
3436	}
3437
3438	/**
3439	* Reattaches the to the target after an error aborting
3440	* pending commands and resending them.
3441	*
3442	* @param pImage iSCSI connection state.
3443	*/
3444	static void iscsiReattach(PISCSIIMAGE pImage)
3445	{
3446	/* Close connection. */
3447	iscsiTransportClose(pImage);
3448	pImage->state = ISCSISTATE_FREE;
3449
3450	/* Reset the state and get the currently pending commands. */
3451	PISCSICMD pIScsiCmdHead = iscsiReset(pImage);
3452
3453	/* Try to attach. */
3454	int rc = iscsiAttach(pImage);
3455	if (RT_SUCCESS(rc))
3456	{
3457	/* Phew, we have a connection again.
3458	* Prepare new PDUs for the aborted commands.
3459	*/
3460	while (pIScsiCmdHead)
3461	{
3462	PISCSICMD pIScsiCmd = pIScsiCmdHead;
3463	pIScsiCmdHead = pIScsiCmdHead->pNext;
3464
3465	pIScsiCmd->pNext = NULL;
3466
3467	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3468	if (RT_FAILURE(rc))
3469	break;
3470	}
3471
3472	if (RT_FAILURE(rc))
3473	{
3474	/* Another error, just give up and report an error. */
3475	PISCSICMD pIScsiCmd = iscsiReset(pImage);
3476
3477	/* Concatenate both lists together so we can abort all requests below. */
3478	if (pIScsiCmd)
3479	{
3480	PISCSICMD pIScsiCmdCur = pIScsiCmd;
3481	while (pIScsiCmdCur->pNext)
3482	pIScsiCmdCur = pIScsiCmdCur->pNext;
3483
3484	pIScsiCmdCur->pNext = pIScsiCmdHead;
3485	pIScsiCmdHead = pIScsiCmd;
3486	}
3487	}
3488	}
3489
3490	if (RT_FAILURE(rc))
3491	{
3492	/*
3493	* Still no luck, complete commands with error so the caller
3494	* has a chance to inform the user and maybe resend the command.
3495	*/
3496	while (pIScsiCmdHead)
3497	{
3498	PISCSICMD pIScsiCmd = pIScsiCmdHead;
3499	pIScsiCmdHead = pIScsiCmdHead->pNext;
3500
3501	iscsiCmdComplete(pImage, pIScsiCmd, VERR_BROKEN_PIPE);
3502	}
3503	}
3504	}
3505
3506	/**
3507	* Internal. Main iSCSI I/O worker.
3508	*/
3509	static DECLCALLBACK(int) iscsiIoThreadWorker(RTTHREAD hThreadSelf, void *pvUser)
3510	{
3511	RT_NOREF1(hThreadSelf);
3512	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
3513
3514	/* Initialize the initial event mask. */
3515	pImage->fPollEvents = VD_INTERFACETCPNET_EVT_READ \| VD_INTERFACETCPNET_EVT_ERROR;
3516
3517	while (pImage->fRunning)
3518	{
3519	uint32_t fEvents;
3520	int rc;
3521
3522	fEvents = 0;
3523
3524	/* Wait for work or for data from the target. */
3525	RTMSINTERVAL msWait;
3526
3527	if (pImage->cCmdsWaiting)
3528	{
3529	pImage->fPollEvents &= ~VD_INTERFACETCPNET_HINT_INTERRUPT;
3530	msWait = pImage->uReadTimeout;
3531	}
3532	else
3533	{
3534	pImage->fPollEvents \|= VD_INTERFACETCPNET_HINT_INTERRUPT;
3535	msWait = RT_INDEFINITE_WAIT;
3536	}
3537
3538	LogFlow(("Waiting for events fPollEvents=%#x\n", pImage->fPollEvents));
3539	rc = iscsiIoThreadWait(pImage, msWait, pImage->fPollEvents, &fEvents);
3540	if (rc == VERR_INTERRUPTED)
3541	{
3542	/* Check the queue. */
3543	PISCSICMD pIScsiCmd = iscsiCmdGet(pImage);
3544
3545	while (pIScsiCmd)
3546	{
3547	switch (pIScsiCmd->enmCmdType)
3548	{
3549	case ISCSICMDTYPE_REQ:
3550	{
3551	if ( !iscsiIsClientConnected(pImage)
3552	&& pImage->fTryReconnect)
3553	{
3554	pImage->fTryReconnect = false;
3555	iscsiReattach(pImage);
3556	}
3557
3558	/* If there is no connection complete the command with an error. */
3559	if (RT_LIKELY(iscsiIsClientConnected(pImage)))
3560	{
3561	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3562	if (RT_FAILURE(rc))
3563	iscsiReattach(pImage);
3564	}
3565	else
3566	iscsiCmdComplete(pImage, pIScsiCmd, VERR_NET_CONNECTION_REFUSED);
3567	break;
3568	}
3569	case ISCSICMDTYPE_EXEC:
3570	{
3571	rc = pIScsiCmd->CmdType.Exec.pfnExec(pIScsiCmd->CmdType.Exec.pvUser);
3572	iscsiCmdComplete(pImage, pIScsiCmd, rc);
3573	break;
3574	}
3575	default:
3576	AssertMsgFailed(("Invalid command type %d\n", pIScsiCmd->enmCmdType));
3577	}
3578
3579	pIScsiCmd = iscsiCmdGet(pImage);
3580	}
3581	}
3582	else if (rc == VERR_TIMEOUT && pImage->cCmdsWaiting)
3583	{
3584	/*
3585	* We are waiting for a response from the target but
3586	* it didn't answered yet.
3587	* We assume the connection is broken and try to reconnect.
3588	*/
3589	LogFlow(("Timed out while waiting for an answer from the target, reconnecting\n"));
3590	iscsiReattach(pImage);
3591	}
3592	else if (RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT)
3593	{
3594	Assert(pImage->state == ISCSISTATE_NORMAL);
3595	LogFlow(("Got socket events %#x\n", fEvents));
3596
3597	if (fEvents & VD_INTERFACETCPNET_EVT_READ)
3598	{
3599	/* Continue or start a new PDU receive task */
3600	LogFlow(("There is data on the socket\n"));
3601	rc = iscsiRecvPDUAsync(pImage);
3602	if (rc == VERR_BROKEN_PIPE)
3603	iscsiReattach(pImage);
3604	else if (RT_FAILURE(rc))
3605	iscsiLogRel(pImage, "iSCSI: Handling incoming request failed %Rrc\n", rc);
3606	}
3607
3608	if (fEvents & VD_INTERFACETCPNET_EVT_WRITE)
3609	{
3610	LogFlow(("The socket is writable\n"));
3611	rc = iscsiSendPDUAsync(pImage);
3612	if (RT_FAILURE(rc))
3613	{
3614	/*
3615	* Something unexpected happened, log the error and try to reset everything
3616	* by reattaching to the target.
3617	*/
3618	iscsiLogRel(pImage, "iSCSI: Sending PDU failed %Rrc\n", rc);
3619	iscsiReattach(pImage);
3620	}
3621	}
3622
3623	if (fEvents & VD_INTERFACETCPNET_EVT_ERROR)
3624	{
3625	LogFlow(("An error ocurred\n"));
3626	iscsiReattach(pImage);
3627	}
3628	}
3629	else
3630	iscsiLogRel(pImage, "iSCSI: Waiting for I/O failed rc=%Rrc\n", rc);
3631	}
3632
3633	return VINF_SUCCESS;
3634	}
3635
3636	/**
3637	* Internal. - Enqueues a request asynchronously.
3638	*/
3639	static int iscsiCommandAsync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq,
3640	PFNISCSICMDCOMPLETED pfnComplete, void *pvUser)
3641	{
3642	int rc;
3643
3644	if (pImage->fExtendedSelectSupported)
3645	{
3646	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3647	if (!pIScsiCmd)
3648	return VERR_NO_MEMORY;
3649
3650	/* Init the command structure. */
3651	pIScsiCmd->pNext = NULL;
3652	pIScsiCmd->enmCmdType = ISCSICMDTYPE_REQ;
3653	pIScsiCmd->pfnComplete = pfnComplete;
3654	pIScsiCmd->pvUser = pvUser;
3655	pIScsiCmd->CmdType.ScsiReq.pScsiReq = pScsiReq;
3656
3657	rc = iscsiCmdPut(pImage, pIScsiCmd);
3658	if (RT_FAILURE(rc))
3659	RTMemFree(pIScsiCmd);
3660	}
3661	else
3662	rc = VERR_NOT_SUPPORTED;
3663
3664	return rc;
3665	}
3666
3667	static DECLCALLBACK(void) iscsiCommandCompleteSync(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3668	{
3669	RT_NOREF1(pImage);
3670	PISCSICMDSYNC pIScsiCmdSync = (PISCSICMDSYNC)pvUser;
3671
3672	pIScsiCmdSync->rcCmd = rcReq;
3673	int rc = RTSemEventSignal(pIScsiCmdSync->EventSem);
3674	AssertRC(rc);
3675	}
3676
3677	/**
3678	* Internal. - Enqueues a request in a synchronous fashion
3679	* i.e. returns when the request completed.
3680	*/
3681	static int iscsiCommandSync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq, bool fRetry, int rcSense)
3682	{
3683	int rc;
3684
3685	if (pImage->fExtendedSelectSupported)
3686	{
3687	ISCSICMDSYNC IScsiCmdSync;
3688
3689	/* Create event semaphore. */
3690	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3691	if (RT_FAILURE(rc))
3692	return rc;
3693
3694	if (fRetry)
3695	{
3696	for (unsigned i = 0; i < 10; i++)
3697	{
3698	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3699	if (RT_FAILURE(rc))
3700	break;
3701
3702	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3703	AssertRC(rc);
3704	rc = IScsiCmdSync.rcCmd;
3705
3706	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3707	\|\| RT_FAILURE(rc))
3708	break;
3709	rc = rcSense;
3710	}
3711	}
3712	else
3713	{
3714	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3715	if (RT_SUCCESS(rc))
3716	{
3717	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3718	AssertRC(rc);
3719	rc = IScsiCmdSync.rcCmd;
3720
3721	if (RT_FAILURE(rc) \|\| pScsiReq->cbSense > 0)
3722	rc = rcSense;
3723	}
3724	}
3725
3726	RTSemEventDestroy(IScsiCmdSync.EventSem);
3727	}
3728	else
3729	{
3730	if (fRetry)
3731	{
3732	rc = VINF_SUCCESS; /* (MSC incorrectly thinks it can be uninitialized) */
3733	for (unsigned i = 0; i < 10; i++)
3734	{
3735	rc = iscsiCommand(pImage, pScsiReq);
3736	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3737	\|\| RT_FAILURE(rc))
3738	break;
3739	rc = rcSense;
3740	}
3741	}
3742	else
3743	{
3744	rc = iscsiCommand(pImage, pScsiReq);
3745	if (RT_FAILURE(rc) \|\| pScsiReq->cbSense > 0)
3746	rc = rcSense;
3747	}
3748	}
3749
3750	return rc;
3751	}
3752
3753
3754	/**
3755	* Internal. - Executes a given function in a synchronous fashion
3756	* on the I/O thread if available.
3757	*/
3758	static int iscsiExecSync(PISCSIIMAGE pImage, PFNISCSIEXEC pfnExec, void *pvUser)
3759	{
3760	int rc;
3761
3762	if (pImage->fExtendedSelectSupported)
3763	{
3764	ISCSICMDSYNC IScsiCmdSync;
3765	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3766	if (!pIScsiCmd)
3767	return VERR_NO_MEMORY;
3768
3769	/* Create event semaphore. */
3770	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3771	if (RT_FAILURE(rc))
3772	{
3773	RTMemFree(pIScsiCmd);
3774	return rc;
3775	}
3776
3777	/* Init the command structure. */
3778	pIScsiCmd->pNext = NULL;
3779	pIScsiCmd->enmCmdType = ISCSICMDTYPE_EXEC;
3780	pIScsiCmd->pfnComplete = iscsiCommandCompleteSync;
3781	pIScsiCmd->pvUser = &IScsiCmdSync;
3782	pIScsiCmd->CmdType.Exec.pfnExec = pfnExec;
3783	pIScsiCmd->CmdType.Exec.pvUser = pvUser;
3784
3785	rc = iscsiCmdPut(pImage, pIScsiCmd);
3786	if (RT_FAILURE(rc))
3787	RTMemFree(pIScsiCmd);
3788	else
3789	{
3790	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3791	AssertRC(rc);
3792	rc = IScsiCmdSync.rcCmd;
3793	}
3794
3795	RTSemEventDestroy(IScsiCmdSync.EventSem);
3796	}
3797	else
3798	{
3799	/* No I/O thread, execute in the current thread. */
3800	rc = pfnExec(pvUser);
3801	}
3802
3803	return rc;
3804	}
3805
3806
3807	static DECLCALLBACK(void) iscsiCommandAsyncComplete(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3808	{
3809	bool fComplete = true;
3810	size_t cbTransfered = 0;
3811	PSCSIREQ pScsiReq = (PSCSIREQ)pvUser;
3812
3813	if (RT_SUCCESS(rcReq))
3814	ASMAtomicWriteU32(&pImage->cLoginsSinceIo, 0);
3815
3816	if ( RT_SUCCESS(rcReq)
3817	&& pScsiReq->cbSense > 0)
3818	{
3819	/* Try again if possible. */
3820	if (pScsiReq->cSenseRetries > 0)
3821	{
3822	pScsiReq->cSenseRetries--;
3823	pScsiReq->cbSense = sizeof(pScsiReq->abSense);
3824	int rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandAsyncComplete, pScsiReq);
3825	if (RT_SUCCESS(rc))
3826	fComplete = false;
3827	else
3828	rcReq = pScsiReq->rcSense;
3829	}
3830	else
3831	rcReq = pScsiReq->rcSense;
3832	}
3833
3834	if (fComplete)
3835	{
3836	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
3837	cbTransfered = pScsiReq->cbT2IData;
3838	else if (pScsiReq->enmXfer == SCSIXFER_TO_TARGET)
3839	cbTransfered = pScsiReq->cbI2TData;
3840	else
3841	AssertMsg(pScsiReq->enmXfer == SCSIXFER_NONE, ("To/From transfers are not supported yet\n"));
3842
3843	/* Continue I/O context. */
3844	pImage->pIfIo->pfnIoCtxCompleted(pImage->pIfIo->Core.pvUser,
3845	pScsiReq->pIoCtx, rcReq,
3846	cbTransfered);
3847
3848	RTMemFree(pScsiReq);
3849	}
3850	}
3851
3852
3853	/**
3854	* Internal. Free all allocated space for representing an image, and optionally
3855	* delete the image from disk.
3856	*/
3857	static int iscsiFreeImage(PISCSIIMAGE pImage, bool fDelete)
3858	{
3859	int rc = VINF_SUCCESS;
3860	Assert(!fDelete); NOREF(fDelete); /* This MUST be false, the flag isn't supported. */
3861
3862	/* Freeing a never allocated image (e.g. because the open failed) is
3863	* not signalled as an error. After all nothing bad happens. */
3864	if (pImage)
3865	{
3866	if (pImage->Mutex != NIL_RTSEMMUTEX)
3867	{
3868	/* Detaching only makes sense when the mutex is there. Otherwise the
3869	* failure happened long before we could attach to the target. */
3870	iscsiExecSync(pImage, iscsiDetach, pImage);
3871	RTSemMutexDestroy(pImage->Mutex);
3872	pImage->Mutex = NIL_RTSEMMUTEX;
3873	}
3874	if (pImage->hThreadIo != NIL_RTTHREAD)
3875	{
3876	ASMAtomicXchgBool(&pImage->fRunning, false);
3877	rc = iscsiIoThreadPoke(pImage);
3878	AssertRC(rc);
3879
3880	/* Wait for the thread to terminate. */
3881	rc = RTThreadWait(pImage->hThreadIo, RT_INDEFINITE_WAIT, NULL);
3882	AssertRC(rc);
3883	}
3884	/* Destroy the socket. */
3885	if (pImage->Socket != NIL_VDSOCKET)
3886	{
3887	pImage->pIfNet->pfnSocketDestroy(pImage->Socket);
3888	}
3889	if (pImage->MutexReqQueue != NIL_RTSEMMUTEX)
3890	{
3891	RTSemMutexDestroy(pImage->MutexReqQueue);
3892	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3893	}
3894	if (pImage->pszTargetName)
3895	{
3896	RTMemFree(pImage->pszTargetName);
3897	pImage->pszTargetName = NULL;
3898	}
3899	if (pImage->pszTargetAddress)
3900	{
3901	RTMemFree(pImage->pszTargetAddress);
3902	pImage->pszTargetAddress = NULL;
3903	}
3904	if (pImage->pszInitiatorName)
3905	{
3906	if (pImage->fAutomaticInitiatorName)
3907	RTStrFree(pImage->pszInitiatorName);
3908	else
3909	RTMemFree(pImage->pszInitiatorName);
3910	pImage->pszInitiatorName = NULL;
3911	}
3912	if (pImage->pszInitiatorUsername)
3913	{
3914	RTMemFree(pImage->pszInitiatorUsername);
3915	pImage->pszInitiatorUsername = NULL;
3916	}
3917	if (pImage->pbInitiatorSecret)
3918	{
3919	RTMemFree(pImage->pbInitiatorSecret);
3920	pImage->pbInitiatorSecret = NULL;
3921	}
3922	if (pImage->pszTargetUsername)
3923	{
3924	RTMemFree(pImage->pszTargetUsername);
3925	pImage->pszTargetUsername = NULL;
3926	}
3927	if (pImage->pbTargetSecret)
3928	{
3929	RTMemFree(pImage->pbTargetSecret);
3930	pImage->pbTargetSecret = NULL;
3931	}
3932	if (pImage->pvRecvPDUBuf)
3933	{
3934	RTMemFree(pImage->pvRecvPDUBuf);
3935	pImage->pvRecvPDUBuf = NULL;
3936	}
3937	if (pImage->pszHostname)
3938	{
3939	RTMemFree(pImage->pszHostname);
3940	pImage->pszHostname = NULL;
3941	}
3942
3943	pImage->cbRecvPDUResidual = 0;
3944	}
3945
3946	LogFlowFunc(("returns %Rrc\n", rc));
3947	return rc;
3948	}
3949
3950	/**
3951	* Inits the basic iSCSI image state, allocating vital resources.
3952	*
3953	* @returns VBox status code.
3954	* @param pImage The iSCSI image instance.
3955	*/
3956	static int iscsiOpenImageInit(PISCSIIMAGE pImage)
3957	{
3958	int rc = VINF_SUCCESS;
3959
3960	/* Get error signalling interface. */
3961	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
3962
3963	/* Get TCP network stack interface. */
3964	pImage->pIfNet = VDIfTcpNetGet(pImage->pVDIfsImage);
3965	if (pImage->pIfNet)
3966	{
3967	/* Get configuration interface. */
3968	pImage->pIfConfig = VDIfConfigGet(pImage->pVDIfsImage);
3969	if (pImage->pIfConfig)
3970	{
3971	/* Get I/O interface. */
3972	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
3973	if (pImage->pIfIo)
3974	{
3975	/* This ISID will be adjusted later to make it unique on this host. */
3976	pImage->pszHostname = NULL;
3977	pImage->uPort = 0;
3978	pImage->Socket = NIL_VDSOCKET;
3979	pImage->ISID = 0x800000000000ULL \| 0x001234560000ULL;
3980	pImage->cISCSIRetries = 10;
3981	pImage->state = ISCSISTATE_FREE;
3982	pImage->cLoginsSinceIo = 0;
3983	pImage->Mutex = NIL_RTSEMMUTEX;
3984	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3985	pImage->pszInitiatorUsername = NULL;
3986	pImage->pbInitiatorSecret = NULL;
3987	pImage->cbInitiatorSecret = 0;
3988	pImage->pszTargetUsername = NULL;
3989	pImage->pbTargetSecret = NULL;
3990	pImage->cbTargetSecret = 0;
3991
3992	memset(pImage->aCmdsWaiting, 0, sizeof(pImage->aCmdsWaiting));
3993	pImage->cbRecvPDUResidual = 0;
3994
3995	pImage->pvRecvPDUBuf = RTMemAlloc(ISCSI_RECV_PDU_BUFFER_SIZE);
3996	pImage->cbRecvPDUBuf = ISCSI_RECV_PDU_BUFFER_SIZE;
3997	if (!pImage->pvRecvPDUBuf)
3998	rc = VERR_NO_MEMORY;
3999
4000	if (RT_SUCCESS(rc))
4001	rc = RTSemMutexCreate(&pImage->Mutex);
4002	if (RT_SUCCESS(rc))
4003	rc = RTSemMutexCreate(&pImage->MutexReqQueue);
4004	}
4005	else
4006	rc = vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_INTERFACE,
4007	RT_SRC_POS, N_("iSCSI: I/O interface missing"));
4008	}
4009	else
4010	rc = vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_INTERFACE,
4011	RT_SRC_POS, N_("iSCSI: configuration interface missing"));
4012	}
4013	else
4014	rc = vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_INTERFACE,
4015	RT_SRC_POS, N_("iSCSI: TCP network stack interface missing"));
4016
4017	return rc;
4018	}
4019
4020	/**
4021	* Parses the user supplied config before opening the connection to the target.
4022	*
4023	* @returns VBox status code.
4024	* @param pImage The iSCSI image instance.
4025	*/
4026	static int iscsiOpenImageParseCfg(PISCSIIMAGE pImage)
4027	{
4028	char pszLUN = NULL, pszLUNInitial = NULL;
4029	bool fLunEncoded = false;
4030	uint32_t uWriteSplitDef = 0;
4031	uint32_t uTimeoutDef = 0;
4032	uint64_t uCfgTmp = 0;
4033	bool fHostIPDef = false;
4034	bool fDumpMalformedPacketsDef = false;
4035
4036	int rc = RTStrToUInt32Full(s_iscsiConfigDefaultWriteSplit, 0, &uWriteSplitDef);
4037	AssertRC(rc);
4038	rc = RTStrToUInt32Full(s_iscsiConfigDefaultTimeout, 0, &uTimeoutDef);
4039	AssertRC(rc);
4040	rc = RTStrToUInt64Full(s_iscsiConfigDefaultHostIPStack, 0, &uCfgTmp);
4041	AssertRC(rc);
4042	fHostIPDef = RT_BOOL(uCfgTmp);
4043	rc = RTStrToUInt64Full(s_iscsiConfigDefaultDumpMalformedPackets, 0, &uCfgTmp);
4044	AssertRC(rc);
4045	fDumpMalformedPacketsDef = RT_BOOL(uCfgTmp);
4046
4047	/* Validate configuration, detect unknown keys. */
4048	if (!VDCFGAreKeysValid(pImage->pIfConfig,
4049	"TargetName\0"
4050	"InitiatorName\0"
4051	"LUN\0"
4052	"TargetAddress\0"
4053	"InitiatorUsername\0"
4054	"InitiatorSecret\0"
4055	"InitiatorSecretEncrypted\0"
4056	"TargetUsername\0"
4057	"TargetSecret\0"
4058	"WriteSplit\0"
4059	"Timeout\0"
4060	"HostIPStack\0"
4061	"DumpMalformedPackets\0"))
4062	return vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_CFG_VALUES, RT_SRC_POS, N_("iSCSI: configuration error: unknown configuration keys present"));
4063
4064	/* Query the iSCSI upper level configuration. */
4065	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "TargetName", &pImage->pszTargetName);
4066	if (RT_FAILURE(rc))
4067	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetName as string"));
4068
4069	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "InitiatorName", &pImage->pszInitiatorName);
4070	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
4071	pImage->fAutomaticInitiatorName = true;
4072	else if (RT_FAILURE(rc))
4073	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorName as string"));
4074
4075	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "LUN", &pszLUN);
4076	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
4077	{
4078	rc = VINF_SUCCESS;
4079	pImage->fAutomaticLUN = true;
4080	}
4081	else if (RT_FAILURE(rc))
4082	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read LUN as string"));
4083
4084	if (pImage->fAutomaticLUN)
4085	pImage->LUN = 0; /* Default to LUN 0. */
4086	else
4087	{
4088	pszLUNInitial = pszLUN;
4089	if (!strncmp(pszLUN, "enc", 3))
4090	{
4091	fLunEncoded = true;
4092	pszLUN += 3;
4093	}
4094	rc = RTStrToUInt64Full(pszLUN, 0, &pImage->LUN);
4095	if (RT_FAILURE(rc))
4096	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to convert LUN to integer"));
4097
4098	RTMemFree(pszLUNInitial);
4099	}
4100	if (RT_SUCCESS(rc) && !fLunEncoded)
4101	{
4102	if (pImage->LUN <= 255)
4103	pImage->LUN = pImage->LUN << 48; /* uses peripheral device addressing method */
4104	else if (pImage->LUN <= 16383)
4105	pImage->LUN = (pImage->LUN << 48) \| RT_BIT_64(62); /* uses flat space addressing method */
4106	else
4107	rc = vdIfError(pImage->pIfError, VERR_OUT_OF_RANGE, RT_SRC_POS, N_("iSCSI: configuration error: LUN number out of range (0-16383)"));
4108	}
4109
4110	if (RT_FAILURE(rc))
4111	return rc;
4112
4113	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "TargetAddress", &pImage->pszTargetAddress);
4114	if (RT_FAILURE(rc))
4115	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetAddress as string"));
4116
4117	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "InitiatorUsername", &pImage->pszInitiatorUsername);
4118	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4119	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorUsername as string"));
4120
4121	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig, "InitiatorSecret",
4122	(void **)&pImage->pbInitiatorSecret, &pImage->cbInitiatorSecret);
4123	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4124	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorSecret as byte string"));
4125
4126	void *pvInitiatorSecretEncrypted;
4127	size_t cbInitiatorSecretEncrypted;
4128	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig, "InitiatorSecretEncrypted",
4129	&pvInitiatorSecretEncrypted, &cbInitiatorSecretEncrypted);
4130	if (RT_SUCCESS(rc))
4131	{
4132	RTMemFree(pvInitiatorSecretEncrypted);
4133	if (!pImage->pbInitiatorSecret)
4134	{
4135	/* we have an encrypted initiator secret but not an unencrypted one */
4136	return vdIfError(pImage->pIfError, VERR_VD_ISCSI_SECRET_ENCRYPTED, RT_SRC_POS, N_("iSCSI: initiator secret not decrypted"));
4137	}
4138	}
4139
4140	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "TargetUsername", &pImage->pszTargetUsername);
4141	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4142	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetUsername as string"));
4143
4144	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig, "TargetSecret",
4145	(void **)&pImage->pbTargetSecret, &pImage->cbTargetSecret);
4146	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4147	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetSecret as byte string"));
4148
4149	rc = VDCFGQueryU32Def(pImage->pIfConfig, "WriteSplit", &pImage->cbWriteSplit, uWriteSplitDef);
4150	if (RT_FAILURE(rc))
4151	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read WriteSplit as U32"));
4152
4153	/* Query the iSCSI lower level configuration. */
4154	rc = VDCFGQueryU32Def(pImage->pIfConfig, "Timeout", &pImage->uReadTimeout, uTimeoutDef);
4155	if (RT_FAILURE(rc))
4156	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read Timeout as U32"));
4157
4158	rc = VDCFGQueryBoolDef(pImage->pIfConfig, "HostIPStack", &pImage->fHostIP, fHostIPDef);
4159	if (RT_FAILURE(rc))
4160	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read HostIPStack as boolean"));
4161
4162	rc = VDCFGQueryBoolDef(pImage->pIfConfig, "DumpMalformedPackets",
4163	&pImage->fDumpMalformedPackets, fDumpMalformedPacketsDef);
4164	if (RT_FAILURE(rc))
4165	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read DumpMalformedPackets as boolean"));
4166
4167	return VINF_SUCCESS;
4168	}
4169
4170	/**
4171	* Creates the necessary socket structure.
4172	*
4173	* @returns VBox status code.
4174	* @param pImage The iSCSI image instance.
4175	*/
4176	static int iscsiOpenImageSocketCreate(PISCSIIMAGE pImage)
4177	{
4178	/* Create the socket structure. */
4179	int rc = pImage->pIfNet->pfnSocketCreate(VD_INTERFACETCPNET_CONNECT_EXTENDED_SELECT,
4180	&pImage->Socket);
4181	if (RT_SUCCESS(rc))
4182	{
4183	pImage->fExtendedSelectSupported = true;
4184	pImage->fRunning = true;
4185	rc = RTThreadCreate(&pImage->hThreadIo, iscsiIoThreadWorker, pImage, 0,
4186	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "iSCSI-Io");
4187	if (RT_FAILURE(rc))
4188	LogFunc(("Creating iSCSI I/O thread failed rc=%Rrc\n", rc));
4189	}
4190	else if (rc == VERR_NOT_SUPPORTED)
4191	{
4192	/* Async I/O is not supported without extended select. */
4193	if ((pImage->uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO))
4194	LogFunc(("Extended select is not supported by the interface but async I/O is requested -> %Rrc\n", rc));
4195	else
4196	{
4197	pImage->fExtendedSelectSupported = false;
4198	rc = pImage->pIfNet->pfnSocketCreate(0, &pImage->Socket);
4199	}
4200	}
4201
4202	if (RT_FAILURE(rc))
4203	LogFunc(("Creating socket failed -> %Rrc\n", rc));
4204
4205	return rc;
4206	}
4207
4208	/**
4209	* Issues a REPORT LUNS to the target.
4210	*
4211	* @returns VBox status code.
4212	* @param pImage The iSCSI image instance.
4213	*/
4214	static int iscsiOpenImageReportLuns(PISCSIIMAGE pImage)
4215	{
4216	SCSIREQ sr;
4217	RTSGSEG DataSeg;
4218	uint8_t rlundata[16];
4219
4220	/*
4221	* Inquire available LUNs.
4222	*/
4223	RT_ZERO(sr.abCDB);
4224	sr.abCDB[0] = SCSI_REPORT_LUNS;
4225	sr.abCDB[1] = 0; /* reserved */
4226	sr.abCDB[2] = 0; /* reserved */
4227	sr.abCDB[3] = 0; /* reserved */
4228	sr.abCDB[4] = 0; /* reserved */
4229	sr.abCDB[5] = 0; /* reserved */
4230	sr.abCDB[6] = sizeof(rlundata) >> 24;
4231	sr.abCDB[7] = (sizeof(rlundata) >> 16) & 0xff;
4232	sr.abCDB[8] = (sizeof(rlundata) >> 8) & 0xff;
4233	sr.abCDB[9] = sizeof(rlundata) & 0xff;
4234	sr.abCDB[10] = 0; /* reserved */
4235	sr.abCDB[11] = 0; /* control */
4236
4237	DataSeg.pvSeg = rlundata;
4238	DataSeg.cbSeg = sizeof(rlundata);
4239
4240	sr.enmXfer = SCSIXFER_FROM_TARGET;
4241	sr.cbCDB = 12;
4242	sr.cbI2TData = 0;
4243	sr.paI2TSegs = NULL;
4244	sr.cI2TSegs = 0;
4245	sr.cbT2IData = DataSeg.cbSeg;
4246	sr.paT2ISegs = &DataSeg;
4247	sr.cT2ISegs = 1;
4248	sr.cbSense = sizeof(sr.abSense);
4249	int rc = iscsiCommandSync(pImage, &sr, false, VERR_INVALID_STATE);
4250	if (RT_FAILURE(rc))
4251	LogRel(("iSCSI: Could not get LUN info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4252
4253	/* If there is a single LUN on the target, then either verify that it matches the explicitly
4254	* configured LUN, or just use it if a LUN was not configured (defaulted to 0). For multi-LUN targets,
4255	* require a correctly configured LUN.
4256	*/
4257	uint32_t cbLuns = (rlundata[0] << 24) \| (rlundata[1] << 16) \| (rlundata[2] << 8) \| rlundata[3];
4258	unsigned cLuns = cbLuns / 8;
4259
4260	/* Dig out the first LUN. */
4261	uint64_t uTgtLun = 0;
4262	if ((rlundata[8] & 0xc0) == 0)
4263	{
4264	/* Single-byte LUN in 0-255 range. */
4265	uTgtLun = rlundata[9];
4266	}
4267	else if ((rlundata[8] & 0xc0) == 0x40)
4268	{
4269	/* Two-byte LUN in 256-16383 range. */
4270	uTgtLun = rlundata[9] \| ((rlundata[8] & 0x3f) << 8);
4271	uTgtLun = (uTgtLun << 48) \| RT_BIT_64(62);
4272	}
4273	else
4274	rc = vdIfError(pImage->pIfError, VERR_OUT_OF_RANGE, RT_SRC_POS, N_("iSCSI: Reported LUN number out of range (0-16383)"));
4275	if (RT_FAILURE(rc))
4276	return rc;
4277
4278	LogRel(("iSCSI: %u LUN(s), first LUN %RX64\n", cLuns, uTgtLun));
4279
4280	/* Convert the LUN back into the 64-bit format. */
4281	if (uTgtLun <= 255)
4282	uTgtLun = uTgtLun << 48;
4283	else
4284	{
4285	Assert(uTgtLun <= 16383);
4286	uTgtLun = (uTgtLun << 48) \| RT_BIT_64(62);
4287	}
4288
4289	if (cLuns == 1)
4290	{
4291	/* NB: It is valid to have a single LUN other than zero, at least in SPC-3. */
4292	if (pImage->fAutomaticLUN)
4293	pImage->LUN = uTgtLun;
4294	else if (pImage->LUN != uTgtLun)
4295	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE, RT_SRC_POS, N_("iSCSI: configuration error: Configured LUN does not match what target provides"));
4296	}
4297
4298	return rc;
4299	}
4300
4301	/**
4302	* Issues the INQUIRY command to the target and checks for the correct device type.
4303	*
4304	* @returns VBox status code.
4305	* @param pImage The iSCSI image instance.
4306	*/
4307	static int iscsiOpenImageInquiry(PISCSIIMAGE pImage)
4308	{
4309	SCSIREQ sr;
4310	RTSGSEG DataSeg;
4311	uint8_t data8[8];
4312
4313	/*
4314	* Inquire device characteristics - no tapes, scanners etc., please.
4315	*/
4316	RT_ZERO(sr.abCDB);
4317	sr.abCDB[0] = SCSI_INQUIRY;
4318	sr.abCDB[1] = 0; /* reserved */
4319	sr.abCDB[2] = 0; /* reserved */
4320	sr.abCDB[3] = 0; /* reserved */
4321	sr.abCDB[4] = sizeof(data8);
4322	sr.abCDB[5] = 0; /* control */
4323
4324	DataSeg.pvSeg = data8;
4325	DataSeg.cbSeg = sizeof(data8);
4326
4327	sr.enmXfer = SCSIXFER_FROM_TARGET;
4328	sr.cbCDB = 6;
4329	sr.cbI2TData = 0;
4330	sr.paI2TSegs = NULL;
4331	sr.cI2TSegs = 0;
4332	sr.cbT2IData = DataSeg.cbSeg;
4333	sr.paT2ISegs = &DataSeg;
4334	sr.cT2ISegs = 1;
4335	sr.cbSense = sizeof(sr.abSense);
4336	int rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4337	if (RT_SUCCESS(rc))
4338	{
4339	uint8_t devType = (sr.cbT2IData > 0) ? data8[0] & SCSI_DEVTYPE_MASK : 255;
4340	if (devType == SCSI_DEVTYPE_DISK)
4341	{
4342	uint8_t uCmdQueue = (sr.cbT2IData >= 8) ? data8[7] & SCSI_INQUIRY_CMDQUE_MASK : 0;
4343	if (uCmdQueue > 0)
4344	pImage->fCmdQueuingSupported = true;
4345	else if (pImage->uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO)
4346	rc = VERR_NOT_SUPPORTED;
4347	else
4348	LogRel(("iSCSI: target address %s, target name %s, %s command queuing\n",
4349	pImage->pszTargetAddress, pImage->pszTargetName,
4350	pImage->fCmdQueuingSupported ? "supports" : "doesn't support"));
4351	}
4352	else
4353	{
4354	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4355	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports device type=%u"),
4356	pImage->pszTargetAddress, pImage->pszTargetName,
4357	pImage->LUN, devType);
4358	LogRel(("iSCSI: Unsupported SCSI peripheral device type %d for target %s\n", devType & SCSI_DEVTYPE_MASK, pImage->pszTargetName));
4359	}
4360	}
4361	else
4362	LogRel(("iSCSI: Could not get INQUIRY info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4363
4364	return rc;
4365	}
4366
4367	/**
4368	* Checks that the target allows write access if the caller requested it.
4369	*
4370	* @returns VBox status code.
4371	* @param pImage The iSCSI image instance.
4372	*/
4373	static int iscsiOpenImageCheckWriteAccess(PISCSIIMAGE pImage)
4374	{
4375	SCSIREQ sr;
4376	RTSGSEG DataSeg;
4377	uint8_t data4[4];
4378
4379	/*
4380	* Query write disable bit in the device specific parameter entry in the
4381	* mode parameter header. Refuse read/write opening of read only disks.
4382	*/
4383	RT_ZERO(sr.abCDB);
4384	sr.abCDB[0] = SCSI_MODE_SENSE_6;
4385	sr.abCDB[1] = 0; /* dbd=0/reserved */
4386	sr.abCDB[2] = 0x3f; /* pc=0/page code=0x3f, ask for all pages */
4387	sr.abCDB[3] = 0; /* subpage code=0, return everything in page_0 format */
4388	sr.abCDB[4] = sizeof(data4); /* allocation length=4 */
4389	sr.abCDB[5] = 0; /* control */
4390
4391	DataSeg.pvSeg = data4;
4392	DataSeg.cbSeg = sizeof(data4);
4393
4394	sr.enmXfer = SCSIXFER_FROM_TARGET;
4395	sr.cbCDB = 6;
4396	sr.cbI2TData = 0;
4397	sr.paI2TSegs = NULL;
4398	sr.cI2TSegs = 0;
4399	sr.cbT2IData = DataSeg.cbSeg;
4400	sr.paT2ISegs = &DataSeg;
4401	sr.cT2ISegs = 1;
4402	sr.cbSense = sizeof(sr.abSense);
4403	int rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4404	if (RT_SUCCESS(rc))
4405	{
4406	pImage->fTargetReadOnly = !!(data4[2] & 0x80);
4407	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) && pImage->fTargetReadOnly)
4408	rc = VERR_VD_IMAGE_READ_ONLY;
4409	}
4410	else
4411	LogRel(("iSCSI: Could not get MODE SENSE info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4412
4413	return rc;
4414	}
4415
4416	/**
4417	* Queries the media and sector size of the target.
4418	*
4419	* @returns VBox status code.
4420	* @param pImage The iSCSI image instance.
4421	*/
4422	static int iscsiOpenImageQueryTargetSizes(PISCSIIMAGE pImage)
4423	{
4424	SCSIREQ sr;
4425	RTSGSEG DataSeg;
4426	uint8_t data12[12];
4427
4428	/*
4429	* Determine sector size and capacity of the volume immediately.
4430	*/
4431	RT_ZERO(data12);
4432	RT_ZERO(sr.abCDB);
4433	sr.abCDB[0] = SCSI_SERVICE_ACTION_IN_16;
4434	sr.abCDB[1] = SCSI_SVC_ACTION_IN_READ_CAPACITY_16; /* subcommand */
4435	sr.abCDB[10+3] = sizeof(data12); /* allocation length (dword) */
4436
4437	DataSeg.pvSeg = data12;
4438	DataSeg.cbSeg = sizeof(data12);
4439
4440	sr.enmXfer = SCSIXFER_FROM_TARGET;
4441	sr.cbCDB = 16;
4442	sr.cbI2TData = 0;
4443	sr.paI2TSegs = NULL;
4444	sr.cI2TSegs = 0;
4445	sr.cbT2IData = DataSeg.cbSeg;
4446	sr.paT2ISegs = &DataSeg;
4447	sr.cT2ISegs = 1;
4448	sr.cbSense = sizeof(sr.abSense);
4449
4450	int rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4451	if (RT_SUCCESS(rc))
4452	{
4453	bool fEnd = false;
4454	uint8_t cMaxRetries = 10;
4455	do
4456	{
4457	switch (sr.status)
4458	{
4459	case SCSI_STATUS_OK:
4460	{
4461	pImage->cVolume = RT_BE2H_U64((uint64_t )&data12[0]);
4462	pImage->cVolume++;
4463	pImage->cbSector = RT_BE2H_U32((uint32_t )&data12[8]);
4464	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4465	if (pImage->cVolume == 0 \|\| pImage->cbSize < pImage->cVolume)
4466	{
4467	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4468	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4469	pImage->pszTargetAddress, pImage->pszTargetName,
4470	pImage->LUN, pImage->cVolume, pImage->cbSector);
4471	}
4472	fEnd = true;
4473	break;
4474	}
4475	case SCSI_STATUS_CHECK_CONDITION:
4476	{
4477	if((sr.abSense[2] & 0x0f) == SCSI_SENSE_UNIT_ATTENTION)
4478	{
4479	if( sr.abSense[12] == SCSI_ASC_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED
4480	&& sr.abSense[13] == SCSI_ASCQ_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED)
4481	{
4482	/** @todo for future: prepare and send command "REQUEST SENSE" which will
4483	* return the status of target and will clear any unit attention
4484	* condition that it reports */
4485	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4486	if (RT_FAILURE(rc))
4487	fEnd = true;
4488	cMaxRetries--;
4489	break;
4490	}
4491	}
4492	break;
4493	}
4494	default:
4495	{
4496	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4497	if (RT_FAILURE(rc))
4498	fEnd = true;
4499	cMaxRetries--;
4500	break;
4501	}
4502	}
4503	if (!cMaxRetries)
4504	fEnd = true;
4505	} while(!fEnd);
4506	}
4507	else
4508	{
4509	uint8_t data8[8];
4510
4511	RT_ZERO(data8);
4512	sr.abCDB[0] = SCSI_READ_CAPACITY;
4513	sr.abCDB[1] = 0; /* reserved */
4514	sr.abCDB[2] = 0; /* reserved */
4515	sr.abCDB[3] = 0; /* reserved */
4516	sr.abCDB[4] = 0; /* reserved */
4517	sr.abCDB[5] = 0; /* reserved */
4518	sr.abCDB[6] = 0; /* reserved */
4519	sr.abCDB[7] = 0; /* reserved */
4520	sr.abCDB[8] = 0; /* reserved */
4521	sr.abCDB[9] = 0; /* control */
4522
4523	DataSeg.pvSeg = data8;
4524	DataSeg.cbSeg = sizeof(data8);
4525
4526	sr.enmXfer = SCSIXFER_FROM_TARGET;
4527	sr.cbCDB = 10;
4528	sr.cbI2TData = 0;
4529	sr.paI2TSegs = NULL;
4530	sr.cI2TSegs = 0;
4531	sr.cbT2IData = DataSeg.cbSeg;
4532	sr.paT2ISegs = &DataSeg;
4533	sr.cT2ISegs = 1;
4534	sr.cbSense = sizeof(sr.abSense);
4535	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4536	if (RT_SUCCESS(rc))
4537	{
4538	bool fEnd = false;
4539	uint8_t cMaxRetries = 10;
4540	do
4541	{
4542	switch (sr.status)
4543	{
4544	case SCSI_STATUS_OK:
4545	{
4546	pImage->cVolume = (data8[0] << 24) \| (data8[1] << 16) \| (data8[2] << 8) \| data8[3];
4547	pImage->cVolume++;
4548	pImage->cbSector = (data8[4] << 24) \| (data8[5] << 16) \| (data8[6] << 8) \| data8[7];
4549	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4550	if (pImage->cVolume == 0)
4551	{
4552	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4553	RT_SRC_POS, N_("iSCSI: fallback capacity detection for target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4554	pImage->pszTargetAddress, pImage->pszTargetName,
4555	pImage->LUN, pImage->cVolume, pImage->cbSector);
4556	}
4557
4558	fEnd = true;
4559	break;
4560	}
4561	case SCSI_STATUS_CHECK_CONDITION:
4562	{
4563	if((sr.abSense[2] & 0x0f) == SCSI_SENSE_UNIT_ATTENTION)
4564	{
4565	if( sr.abSense[12] == SCSI_ASC_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED
4566	&& sr.abSense[13] == SCSI_ASCQ_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED)
4567	{
4568	/** @todo for future: prepare and send command "REQUEST SENSE" which will
4569	* return the status of target and will clear any unit attention
4570	* condition that it reports */
4571	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4572	if (RT_FAILURE(rc))
4573	fEnd = true;
4574	cMaxRetries--;
4575	break;
4576
4577	}
4578	}
4579	break;
4580	}
4581	default:
4582	{
4583	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4584	if (RT_FAILURE(rc))
4585	fEnd = true;
4586	cMaxRetries--;
4587	break;
4588	}
4589	}
4590	if (!cMaxRetries)
4591	fEnd = true;
4592	} while(!fEnd);
4593	}
4594	else
4595	LogRel(("iSCSI: Could not determine capacity of target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4596	}
4597
4598	return rc;
4599	}
4600
4601	/**
4602	* Queries the state of the read/write caches and tries to enable them if disabled.
4603	*
4604	* @returns VBox status code.
4605	* @param pImage The iSCSI image instance.
4606	*/
4607	static int iscsiOpenImageEnableReadWriteCache(PISCSIIMAGE pImage)
4608	{
4609	/*
4610	* Check the read and write cache bits.
4611	* Try to enable the cache if it is disabled.
4612	*
4613	* We already checked that this is a block access device. No need
4614	* to do it again.
4615	*/
4616	SCSIREQ sr;
4617	RTSGSEG DataSeg;
4618	uint8_t aCachingModePage[32];
4619
4620	memset(aCachingModePage, '\0', sizeof(aCachingModePage));
4621	sr.abCDB[0] = SCSI_MODE_SENSE_6;
4622	sr.abCDB[1] = 0;
4623	sr.abCDB[2] = (0x00 << 6) \| (0x08 & 0x3f); /* Current values and caching mode page */
4624	sr.abCDB[3] = 0; /* Sub page code. */
4625	sr.abCDB[4] = sizeof(aCachingModePage) & 0xff;
4626	sr.abCDB[5] = 0;
4627
4628	DataSeg.pvSeg = aCachingModePage;
4629	DataSeg.cbSeg = sizeof(aCachingModePage);
4630
4631	sr.enmXfer = SCSIXFER_FROM_TARGET;
4632	sr.cbCDB = 6;
4633	sr.cbI2TData = 0;
4634	sr.paI2TSegs = NULL;
4635	sr.cI2TSegs = 0;
4636	sr.cbT2IData = DataSeg.cbSeg;
4637	sr.paT2ISegs = &DataSeg;
4638	sr.cT2ISegs = 1;
4639	sr.cbSense = sizeof(sr.abSense);
4640	int rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4641	if ( RT_SUCCESS(rc)
4642	&& (sr.status == SCSI_STATUS_OK)
4643	&& (aCachingModePage[0] >= 15)
4644	&& (aCachingModePage[4 + aCachingModePage[3]] & 0x3f) == 0x08
4645	&& (aCachingModePage[4 + aCachingModePage[3] + 1] > 3))
4646	{
4647	uint32_t Offset = 4 + aCachingModePage[3];
4648	/*
4649	* Check if the read and/or the write cache is disabled.
4650	* The write cache is disabled if bit 2 (WCE) is zero and
4651	* the read cache is disabled if bit 0 (RCD) is set.
4652	*/
4653	if (!ASMBitTest(&aCachingModePage[Offset + 2], 2) \|\| ASMBitTest(&aCachingModePage[Offset + 2], 0))
4654	{
4655	/*
4656	* Write Cache Enable (WCE) bit is zero or the Read Cache Disable (RCD) is one
4657	* So one of the caches is disabled. Enable both caches.
4658	* The rest is unchanged.
4659	*/
4660	ASMBitSet(&aCachingModePage[Offset + 2], 2);
4661	ASMBitClear(&aCachingModePage[Offset + 2], 0);
4662
4663	sr.abCDB[0] = SCSI_MODE_SELECT_6;
4664	sr.abCDB[1] = 0; /* Don't write the page into NV RAM. */
4665	sr.abCDB[2] = 0;
4666	sr.abCDB[3] = 0;
4667	sr.abCDB[4] = sizeof(aCachingModePage) & 0xff;
4668	sr.abCDB[5] = 0;
4669
4670	DataSeg.pvSeg = aCachingModePage;
4671	DataSeg.cbSeg = sizeof(aCachingModePage);
4672
4673	sr.enmXfer = SCSIXFER_TO_TARGET;
4674	sr.cbCDB = 6;
4675	sr.cbI2TData = DataSeg.cbSeg;
4676	sr.paI2TSegs = &DataSeg;
4677	sr.cI2TSegs = 1;
4678	sr.cbT2IData = 0;
4679	sr.paT2ISegs = NULL;
4680	sr.cT2ISegs = 0;
4681	sr.cbSense = sizeof(sr.abSense);
4682	sr.status = 0;
4683	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4684	if ( RT_SUCCESS(rc)
4685	&& (sr.status == SCSI_STATUS_OK))
4686	LogRel(("iSCSI: Enabled read and write cache of target %s\n", pImage->pszTargetName));
4687	else
4688	{
4689	/* Log failures but continue. */
4690	LogRel(("iSCSI: Could not enable read and write cache of target %s, rc=%Rrc status=%#x\n",
4691	pImage->pszTargetName, rc, sr.status));
4692	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sr.abSense));
4693	rc = VINF_SUCCESS;
4694	}
4695	}
4696	}
4697	else
4698	{
4699	/* Log errors but continue. */
4700	LogRel(("iSCSI: Could not check write cache of target %s, rc=%Rrc, got mode page %#x\n", pImage->pszTargetName, rc, aCachingModePage[0] & 0x3f));
4701	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sr.abSense));
4702	rc = VINF_SUCCESS;
4703	}
4704
4705	return rc;
4706	}
4707
4708	/**
4709	* Internal: Open an image, constructing all necessary data structures.
4710	*/
4711	static int iscsiOpenImage(PISCSIIMAGE pImage, unsigned uOpenFlags)
4712	{
4713	pImage->uOpenFlags = uOpenFlags;
4714
4715	int rc = iscsiOpenImageInit(pImage);
4716	if (RT_SUCCESS(rc))
4717	rc = iscsiOpenImageParseCfg(pImage);
4718
4719	if (RT_SUCCESS(rc))
4720	{
4721	/* Don't actually establish iSCSI transport connection if this is just an
4722	* open to query the image information and the host IP stack isn't used.
4723	* Even trying is rather useless, as in this context the InTnet IP stack
4724	* isn't present. Returning dummies is the best possible result anyway. */
4725	if ((uOpenFlags & VD_OPEN_FLAGS_INFO) && !pImage->fHostIP)
4726	LogFunc(("Not opening the transport connection as IntNet IP stack is not available. Will return dummies\n"));
4727	else
4728	{
4729	rc = iscsiOpenImageSocketCreate(pImage);
4730	if (RT_SUCCESS(rc))
4731	{
4732	/*
4733	* Attach to the iSCSI target. This implicitly establishes the iSCSI
4734	* transport connection.
4735	*/
4736	rc = iscsiExecSync(pImage, iscsiAttach, pImage);
4737	if (RT_SUCCESS(rc))
4738	{
4739	LogFlowFunc(("target '%s' opened successfully\n", pImage->pszTargetName));
4740
4741	rc = iscsiOpenImageReportLuns(pImage);
4742	if (RT_SUCCESS(rc))
4743	rc = iscsiOpenImageInquiry(pImage);
4744	if (RT_SUCCESS(rc))
4745	rc = iscsiOpenImageCheckWriteAccess(pImage);
4746	if (RT_SUCCESS(rc))
4747	rc = iscsiOpenImageQueryTargetSizes(pImage);
4748	if (RT_SUCCESS(rc))
4749	rc = iscsiOpenImageEnableReadWriteCache(pImage);
4750	}
4751	else
4752	LogRel(("iSCSI: could not open target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4753	}
4754	}
4755	}
4756
4757	if (RT_SUCCESS(rc))
4758	{
4759	PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
4760	pImage->RegionList.fFlags = 0;
4761	pImage->RegionList.cRegions = 1;
4762
4763	pRegion->offRegion = 0; /* Disk start. */
4764	pRegion->cbBlock = pImage->cbSector;
4765	pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
4766	pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
4767	pRegion->cbData = pImage->cbSector;
4768	pRegion->cbMetadata = 0;
4769	pRegion->cRegionBlocksOrBytes = pImage->cbSize;
4770	}
4771	else
4772	iscsiFreeImage(pImage, false);
4773	return rc;
4774	}
4775
4776
4777	/** @copydoc VDIMAGEBACKEND::pfnProbe */
4778	static DECLCALLBACK(int) iscsiProbe(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
4779	PVDINTERFACE pVDIfsImage, VDTYPE enmDesiredType, VDTYPE *penmType)
4780	{
4781	RT_NOREF(pszFilename, pVDIfsDisk, pVDIfsImage, enmDesiredType, penmType);
4782	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
4783
4784	/* iSCSI images can't be checked for validity this way, as the filename
4785	* just can't supply enough configuration information. */
4786	int rc = VERR_VD_ISCSI_INVALID_HEADER;
4787
4788	LogFlowFunc(("returns %Rrc\n", rc));
4789	return rc;
4790	}
4791
4792	/** @copydoc VDIMAGEBACKEND::pfnOpen */
4793	static DECLCALLBACK(int) iscsiOpen(const char *pszFilename, unsigned uOpenFlags,
4794	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4795	VDTYPE enmType, void **ppBackendData)
4796	{
4797	RT_NOREF1(enmType); /*< @todo r=klaus make use of the type info. /
4798
4799	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n",
4800	pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
4801	int rc;
4802
4803	/* Check open flags. All valid flags are supported. */
4804	AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
4805	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
4806	AssertReturn(*pszFilename != '\0', VERR_INVALID_PARAMETER);
4807
4808	PISCSIIMAGE pImage = (PISCSIIMAGE)RTMemAllocZ(RT_UOFFSETOF(ISCSIIMAGE, RegionList.aRegions[1]));
4809	if (RT_LIKELY(pImage))
4810	{
4811	pImage->pszFilename = pszFilename;
4812	pImage->pszInitiatorName = NULL;
4813	pImage->pszTargetName = NULL;
4814	pImage->pszTargetAddress = NULL;
4815	pImage->pszInitiatorUsername = NULL;
4816	pImage->pbInitiatorSecret = NULL;
4817	pImage->pszTargetUsername = NULL;
4818	pImage->pbTargetSecret = NULL;
4819	pImage->paCurrReq = NULL;
4820	pImage->pvRecvPDUBuf = NULL;
4821	pImage->pszHostname = NULL;
4822	pImage->pVDIfsDisk = pVDIfsDisk;
4823	pImage->pVDIfsImage = pVDIfsImage;
4824	pImage->cLogRelErrors = 0;
4825
4826	rc = iscsiOpenImage(pImage, uOpenFlags);
4827	if (RT_SUCCESS(rc))
4828	{
4829	LogFlowFunc(("target %s cVolume %d, cbSector %d\n", pImage->pszTargetName, pImage->cVolume, pImage->cbSector));
4830	LogRel(("iSCSI: target address %s, target name %s, SCSI LUN %lld\n", pImage->pszTargetAddress, pImage->pszTargetName, pImage->LUN));
4831	*ppBackendData = pImage;
4832	}
4833	else
4834	RTMemFree(pImage);
4835	}
4836	else
4837	rc = VERR_NO_MEMORY;
4838
4839	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4840	return rc;
4841	}
4842
4843	/** @copydoc VDIMAGEBACKEND::pfnCreate */
4844	static DECLCALLBACK(int) iscsiCreate(const char *pszFilename, uint64_t cbSize,
4845	unsigned uImageFlags, const char *pszComment,
4846	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
4847	PCRTUUID pUuid, unsigned uOpenFlags,
4848	unsigned uPercentStart, unsigned uPercentSpan,
4849	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4850	PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
4851	void **ppBackendData)
4852	{
4853	RT_NOREF8(pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags);
4854	RT_NOREF7(uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData);
4855	LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p enmType=%u ppBackendData=%#p",
4856	pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
4857	int rc = VERR_NOT_SUPPORTED;
4858
4859	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4860	return rc;
4861	}
4862
4863	/** @copydoc VDIMAGEBACKEND::pfnClose */
4864	static DECLCALLBACK(int) iscsiClose(void *pBackendData, bool fDelete)
4865	{
4866	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
4867	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4868	int rc;
4869
4870	Assert(!fDelete); /* This flag is unsupported. */
4871
4872	rc = iscsiFreeImage(pImage, fDelete);
4873	RTMemFree(pImage);
4874
4875	LogFlowFunc(("returns %Rrc\n", rc));
4876	return rc;
4877	}
4878
4879	/** @copydoc VDIMAGEBACKEND::pfnRead */
4880	static DECLCALLBACK(int) iscsiRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
4881	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
4882	{
4883	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4884	int rc = VINF_SUCCESS;
4885
4886	LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbToRead=%u pcbActuallyRead=%p\n",
4887	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
4888
4889	if ( uOffset + cbToRead > pImage->cbSize
4890	\|\| cbToRead == 0)
4891	return VERR_INVALID_PARAMETER;
4892
4893	/*
4894	* Clip read size to a value which is supported by the target.
4895	*/
4896	cbToRead = RT_MIN(cbToRead, pImage->cbRecvDataLength);
4897
4898	unsigned cT2ISegs = 0;
4899	size_t cbSegs = 0;
4900
4901	/* Get the number of segments. */
4902	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
4903	NULL, &cT2ISegs, cbToRead);
4904	Assert(cbSegs == cbToRead);
4905
4906	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(RT_UOFFSETOF_DYN(SCSIREQ, aSegs[cT2ISegs]));
4907	if (RT_LIKELY(pReq))
4908	{
4909	uint64_t lba;
4910	uint16_t tls;
4911	uint8_t *pbCDB = &pReq->abCDB[0];
4912	size_t cbCDB;
4913
4914	lba = uOffset / pImage->cbSector;
4915	tls = (uint16_t)(cbToRead / pImage->cbSector);
4916
4917	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
4918	&pReq->aSegs[0],
4919	&cT2ISegs, cbToRead);
4920	Assert(cbSegs == cbToRead);
4921
4922	if (pImage->cVolume < _4G)
4923	{
4924	cbCDB = 10;
4925	pbCDB[0] = SCSI_READ_10;
4926	pbCDB[1] = 0; /* reserved */
4927	pbCDB[2] = (lba >> 24) & 0xff;
4928	pbCDB[3] = (lba >> 16) & 0xff;
4929	pbCDB[4] = (lba >> 8) & 0xff;
4930	pbCDB[5] = lba & 0xff;
4931	pbCDB[6] = 0; /* reserved */
4932	pbCDB[7] = (tls >> 8) & 0xff;
4933	pbCDB[8] = tls & 0xff;
4934	pbCDB[9] = 0; /* control */
4935	}
4936	else
4937	{
4938	cbCDB = 16;
4939	pbCDB[0] = SCSI_READ_16;
4940	pbCDB[1] = 0; /* reserved */
4941	pbCDB[2] = (lba >> 56) & 0xff;
4942	pbCDB[3] = (lba >> 48) & 0xff;
4943	pbCDB[4] = (lba >> 40) & 0xff;
4944	pbCDB[5] = (lba >> 32) & 0xff;
4945	pbCDB[6] = (lba >> 24) & 0xff;
4946	pbCDB[7] = (lba >> 16) & 0xff;
4947	pbCDB[8] = (lba >> 8) & 0xff;
4948	pbCDB[9] = lba & 0xff;
4949	pbCDB[10] = 0; /* tls unused */
4950	pbCDB[11] = 0; /* tls unused */
4951	pbCDB[12] = (tls >> 8) & 0xff;
4952	pbCDB[13] = tls & 0xff;
4953	pbCDB[14] = 0; /* reserved */
4954	pbCDB[15] = 0; /* reserved */
4955	}
4956
4957	pReq->enmXfer = SCSIXFER_FROM_TARGET;
4958	pReq->cbCDB = cbCDB;
4959	pReq->cbI2TData = 0;
4960	pReq->paI2TSegs = NULL;
4961	pReq->cI2TSegs = 0;
4962	pReq->cbT2IData = cbToRead;
4963	pReq->paT2ISegs = &pReq->aSegs[pReq->cI2TSegs];
4964	pReq->cbSense = sizeof(pReq->abSense);
4965	pReq->cT2ISegs = cT2ISegs;
4966	pReq->pIoCtx = pIoCtx;
4967	pReq->cSenseRetries = 10;
4968	pReq->rcSense = VERR_READ_ERROR;
4969
4970	if (vdIfIoIntIoCtxIsSynchronous(pImage->pIfIo, pIoCtx))
4971	{
4972	rc = iscsiCommandSync(pImage, pReq, true, VERR_READ_ERROR);
4973	if (RT_FAILURE(rc))
4974	{
4975	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4976	*pcbActuallyRead = 0;
4977	}
4978	else
4979	*pcbActuallyRead = pReq->cbT2IData;
4980	}
4981	else
4982	{
4983	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReq);
4984	if (RT_FAILURE(rc))
4985	AssertMsgFailed(("iscsiCommandAsync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4986	else
4987	{
4988	*pcbActuallyRead = cbToRead;
4989	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
4990	}
4991	}
4992
4993	RTMemFree(pReq);
4994	}
4995	else
4996	rc = VERR_NO_MEMORY;
4997
4998	LogFlowFunc(("returns rc=%Rrc\n", rc));
4999	return rc;
5000	}
5001
5002	/** @copydoc VDIMAGEBACKEND::pfnWrite */
5003	static DECLCALLBACK(int) iscsiWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
5004	PVDIOCTX pIoCtx, size_t pcbWriteProcess, size_t pcbPreRead,
5005	size_t *pcbPostRead, unsigned fWrite)
5006	{
5007	RT_NOREF3(pcbPreRead, pcbPostRead, fWrite);
5008	LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbToWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
5009	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
5010	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5011	int rc = VINF_SUCCESS;
5012
5013	AssertPtr(pImage);
5014	Assert(uOffset % 512 == 0);
5015	Assert(cbToWrite % 512 == 0);
5016
5017	if (uOffset + cbToWrite > pImage->cbSize)
5018	return VERR_INVALID_PARAMETER;
5019
5020	/*
5021	* Clip read size to a value which is supported by the target.
5022	*/
5023	cbToWrite = RT_MIN(cbToWrite, pImage->cbSendDataLength);
5024
5025	unsigned cI2TSegs = 0;
5026	size_t cbSegs = 0;
5027
5028	/* Get the number of segments. */
5029	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5030	NULL, &cI2TSegs, cbToWrite);
5031	Assert(cbSegs == cbToWrite);
5032
5033	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(RT_UOFFSETOF_DYN(SCSIREQ, aSegs[cI2TSegs]));
5034	if (RT_LIKELY(pReq))
5035	{
5036	uint64_t lba;
5037	uint16_t tls;
5038	uint8_t *pbCDB = &pReq->abCDB[0];
5039	size_t cbCDB;
5040
5041	lba = uOffset / pImage->cbSector;
5042	tls = (uint16_t)(cbToWrite / pImage->cbSector);
5043
5044	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5045	&pReq->aSegs[0],
5046	&cI2TSegs, cbToWrite);
5047	Assert(cbSegs == cbToWrite);
5048
5049	if (pImage->cVolume < _4G)
5050	{
5051	cbCDB = 10;
5052	pbCDB[0] = SCSI_WRITE_10;
5053	pbCDB[1] = 0; /* reserved */
5054	pbCDB[2] = (lba >> 24) & 0xff;
5055	pbCDB[3] = (lba >> 16) & 0xff;
5056	pbCDB[4] = (lba >> 8) & 0xff;
5057	pbCDB[5] = lba & 0xff;
5058	pbCDB[6] = 0; /* reserved */
5059	pbCDB[7] = (tls >> 8) & 0xff;
5060	pbCDB[8] = tls & 0xff;
5061	pbCDB[9] = 0; /* control */
5062	}
5063	else
5064	{
5065	cbCDB = 16;
5066	pbCDB[0] = SCSI_WRITE_16;
5067	pbCDB[1] = 0; /* reserved */
5068	pbCDB[2] = (lba >> 56) & 0xff;
5069	pbCDB[3] = (lba >> 48) & 0xff;
5070	pbCDB[4] = (lba >> 40) & 0xff;
5071	pbCDB[5] = (lba >> 32) & 0xff;
5072	pbCDB[6] = (lba >> 24) & 0xff;
5073	pbCDB[7] = (lba >> 16) & 0xff;
5074	pbCDB[8] = (lba >> 8) & 0xff;
5075	pbCDB[9] = lba & 0xff;
5076	pbCDB[10] = 0; /* tls unused */
5077	pbCDB[11] = 0; /* tls unused */
5078	pbCDB[12] = (tls >> 8) & 0xff;
5079	pbCDB[13] = tls & 0xff;
5080	pbCDB[14] = 0; /* reserved */
5081	pbCDB[15] = 0; /* reserved */
5082	}
5083
5084	pReq->enmXfer = SCSIXFER_TO_TARGET;
5085	pReq->cbCDB = cbCDB;
5086	pReq->cbI2TData = cbToWrite;
5087	pReq->paI2TSegs = &pReq->aSegs[0];
5088	pReq->cI2TSegs = cI2TSegs;
5089	pReq->cbT2IData = 0;
5090	pReq->paT2ISegs = NULL;
5091	pReq->cT2ISegs = 0;
5092	pReq->cbSense = sizeof(pReq->abSense);
5093	pReq->pIoCtx = pIoCtx;
5094	pReq->cSenseRetries = 10;
5095	pReq->rcSense = VERR_WRITE_ERROR;
5096
5097	if (vdIfIoIntIoCtxIsSynchronous(pImage->pIfIo, pIoCtx))
5098	{
5099	rc = iscsiCommandSync(pImage, pReq, true, VERR_WRITE_ERROR);
5100	if (RT_FAILURE(rc))
5101	{
5102	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5103	*pcbWriteProcess = 0;
5104	}
5105	else
5106	*pcbWriteProcess = cbToWrite;
5107	}
5108	else
5109	{
5110	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReq);
5111	if (RT_FAILURE(rc))
5112	AssertMsgFailed(("iscsiCommandAsync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5113	else
5114	{
5115	*pcbWriteProcess = cbToWrite;
5116	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5117	}
5118	}
5119
5120	RTMemFree(pReq);
5121	}
5122	else
5123	rc = VERR_NO_MEMORY;
5124
5125	LogFlowFunc(("returns rc=%Rrc\n", rc));
5126	return rc;
5127	}
5128
5129	/** @copydoc VDIMAGEBACKEND::pfnFlush */
5130	static DECLCALLBACK(int) iscsiFlush(void *pBackendData, PVDIOCTX pIoCtx)
5131	{
5132	LogFlowFunc(("pBackendData=%p pIoCtx=%#p\n", pBackendData, pIoCtx));
5133	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5134	int rc = VINF_SUCCESS;
5135
5136	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5137	if (RT_LIKELY(pReq))
5138	{
5139	uint8_t *pbCDB = &pReq->abCDB[0];
5140
5141	pbCDB[0] = SCSI_SYNCHRONIZE_CACHE;
5142	pbCDB[1] = 0; /* reserved */
5143	pbCDB[2] = 0; /* reserved */
5144	pbCDB[3] = 0; /* reserved */
5145	pbCDB[4] = 0; /* reserved */
5146	pbCDB[5] = 0; /* reserved */
5147	pbCDB[6] = 0; /* reserved */
5148	pbCDB[7] = 0; /* reserved */
5149	pbCDB[8] = 0; /* reserved */
5150	pbCDB[9] = 0; /* control */
5151
5152	pReq->enmXfer = SCSIXFER_NONE;
5153	pReq->cbCDB = 10;
5154	pReq->cbI2TData = 0;
5155	pReq->paI2TSegs = NULL;
5156	pReq->cI2TSegs = 0;
5157	pReq->cbT2IData = 0;
5158	pReq->paT2ISegs = NULL;
5159	pReq->cT2ISegs = 0;
5160	pReq->cbSense = sizeof(pReq->abSense);
5161	pReq->pIoCtx = pIoCtx;
5162	pReq->cSenseRetries = 0;
5163	pReq->rcSense = VINF_SUCCESS;
5164
5165	if (vdIfIoIntIoCtxIsSynchronous(pImage->pIfIo, pIoCtx))
5166	{
5167	rc = iscsiCommandSync(pImage, pReq, false, VINF_SUCCESS);
5168	if (RT_FAILURE(rc))
5169	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
5170	}
5171	else
5172	{
5173	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReq);
5174	if (RT_FAILURE(rc))
5175	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
5176	else
5177	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5178	}
5179
5180	RTMemFree(pReq);
5181	}
5182	else
5183	rc = VERR_NO_MEMORY;
5184
5185	LogFlowFunc(("returns rc=%Rrc\n", rc));
5186	return rc;
5187	}
5188
5189	/** @copydoc VDIMAGEBACKEND::pfnGetVersion */
5190	static DECLCALLBACK(unsigned) iscsiGetVersion(void *pBackendData)
5191	{
5192	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5193	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5194
5195	AssertPtr(pImage);
5196	RT_NOREF1(pImage);
5197
5198	return 0;
5199	}
5200
5201	/** @copydoc VDIMAGEBACKEND::pfnGetFileSize */
5202	static DECLCALLBACK(uint64_t) iscsiGetFileSize(void *pBackendData)
5203	{
5204	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5205	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5206
5207	AssertPtrReturn(pImage, 0);
5208
5209	return pImage->cbSize;
5210	}
5211
5212	/** @copydoc VDIMAGEBACKEND::pfnGetPCHSGeometry */
5213	static DECLCALLBACK(int) iscsiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
5214	{
5215	RT_NOREF1(pPCHSGeometry);
5216	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
5217	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5218
5219	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5220
5221	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", VERR_VD_GEOMETRY_NOT_SET,
5222	pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
5223	return VERR_VD_GEOMETRY_NOT_SET;
5224	}
5225
5226	/** @copydoc VDIMAGEBACKEND::pfnSetPCHSGeometry */
5227	static DECLCALLBACK(int) iscsiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
5228	{
5229	RT_NOREF1(pPCHSGeometry);
5230	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
5231	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5232
5233	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5234
5235	int rc;
5236	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
5237	rc = VERR_VD_IMAGE_READ_ONLY;
5238	else
5239	rc = VERR_VD_GEOMETRY_NOT_SET;
5240
5241	LogFlowFunc(("returns %Rrc\n", rc));
5242	return rc;
5243	}
5244
5245	/** @copydoc VDIMAGEBACKEND::pfnGetLCHSGeometry */
5246	static DECLCALLBACK(int) iscsiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
5247	{
5248	RT_NOREF1(pLCHSGeometry);
5249	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
5250	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5251
5252	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5253
5254	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", VERR_VD_GEOMETRY_NOT_SET,
5255	pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
5256	return VERR_VD_GEOMETRY_NOT_SET;
5257	}
5258
5259	/** @copydoc VDIMAGEBACKEND::pfnSetLCHSGeometry */
5260	static DECLCALLBACK(int) iscsiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
5261	{
5262	RT_NOREF1(pLCHSGeometry);
5263	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
5264	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5265
5266	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5267
5268	int rc;
5269	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
5270	rc = VERR_VD_IMAGE_READ_ONLY;
5271	else
5272	rc = VERR_VD_GEOMETRY_NOT_SET;
5273
5274	LogFlowFunc(("returns %Rrc\n", rc));
5275	return rc;
5276	}
5277
5278	/** @copydoc VDIMAGEBACKEND::pfnQueryRegions */
5279	static DECLCALLBACK(int) iscsiQueryRegions(void pBackendData, PCVDREGIONLIST ppRegionList)
5280	{
5281	LogFlowFunc(("pBackendData=%#p ppRegionList=%#p\n", pBackendData, ppRegionList));
5282	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5283
5284	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5285
5286	*ppRegionList = &pImage->RegionList;
5287	LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
5288	return VINF_SUCCESS;
5289	}
5290
5291	/** @copydoc VDIMAGEBACKEND::pfnRegionListRelease */
5292	static DECLCALLBACK(void) iscsiRegionListRelease(void *pBackendData, PCVDREGIONLIST pRegionList)
5293	{
5294	RT_NOREF1(pRegionList);
5295	LogFlowFunc(("pBackendData=%#p pRegionList=%#p\n", pBackendData, pRegionList));
5296	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5297	AssertPtr(pImage); RT_NOREF(pImage);
5298
5299	/* Nothing to do here. */
5300	}
5301
5302	/** @copydoc VDIMAGEBACKEND::pfnGetImageFlags */
5303	static DECLCALLBACK(unsigned) iscsiGetImageFlags(void *pBackendData)
5304	{
5305	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5306	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5307
5308	AssertPtrReturn(pImage, 0);
5309
5310	LogFlowFunc(("returns %#x\n", VD_IMAGE_FLAGS_FIXED));
5311	return VD_IMAGE_FLAGS_FIXED;
5312	}
5313
5314	/** @copydoc VDIMAGEBACKEND::pfnGetOpenFlags */
5315	static DECLCALLBACK(unsigned) iscsiGetOpenFlags(void *pBackendData)
5316	{
5317	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5318	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5319
5320	AssertPtrReturn(pImage, 0);
5321
5322	LogFlowFunc(("returns %#x\n", pImage->uOpenFlags));
5323	return pImage->uOpenFlags;
5324	}
5325
5326	/** @copydoc VDIMAGEBACKEND::pfnSetOpenFlags */
5327	static DECLCALLBACK(int) iscsiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
5328	{
5329	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
5330	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5331	int rc = VINF_SUCCESS;
5332
5333	/* Image must be opened and the new flags must be valid. */
5334	AssertReturn(pImage && !(uOpenFlags & ~( VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO
5335	\| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE
5336	\| VD_OPEN_FLAGS_SEQUENTIAL \| VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)),
5337	VERR_INVALID_PARAMETER);
5338
5339	/*
5340	* A read/write -> readonly transition is always possible,
5341	* for the reverse direction check that the target didn't present itself
5342	* as readonly during the first attach.
5343	*/
5344	if ( !(uOpenFlags & VD_OPEN_FLAGS_READONLY)
5345	&& (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
5346	&& pImage->fTargetReadOnly)
5347	rc = VERR_VD_IMAGE_READ_ONLY;
5348	else
5349	{
5350	pImage->uOpenFlags = uOpenFlags;
5351	pImage->fTryReconnect = true;
5352	}
5353
5354	LogFlowFunc(("returns %Rrc\n", rc));
5355	return rc;
5356	}
5357
5358	/** @copydoc VDIMAGEBACKEND::pfnGetComment */
5359	VD_BACKEND_CALLBACK_GET_COMMENT_DEF_NOT_SUPPORTED(iscsiGetComment);
5360
5361	/** @copydoc VDIMAGEBACKEND::pfnSetComment */
5362	VD_BACKEND_CALLBACK_SET_COMMENT_DEF_NOT_SUPPORTED(iscsiSetComment, PISCSIIMAGE);
5363
5364	/** @copydoc VDIMAGEBACKEND::pfnGetUuid */
5365	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetUuid);
5366
5367	/** @copydoc VDIMAGEBACKEND::pfnSetUuid */
5368	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetUuid, PISCSIIMAGE);
5369
5370	/** @copydoc VDIMAGEBACKEND::pfnGetModificationUuid */
5371	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetModificationUuid);
5372
5373	/** @copydoc VDIMAGEBACKEND::pfnSetModificationUuid */
5374	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetModificationUuid, PISCSIIMAGE);
5375
5376	/** @copydoc VDIMAGEBACKEND::pfnGetParentUuid */
5377	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetParentUuid);
5378
5379	/** @copydoc VDIMAGEBACKEND::pfnSetParentUuid */
5380	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetParentUuid, PISCSIIMAGE);
5381
5382	/** @copydoc VDIMAGEBACKEND::pfnGetParentModificationUuid */
5383	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetParentModificationUuid);
5384
5385	/** @copydoc VDIMAGEBACKEND::pfnSetParentModificationUuid */
5386	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetParentModificationUuid, PISCSIIMAGE);
5387
5388	/** @copydoc VDIMAGEBACKEND::pfnDump */
5389	static DECLCALLBACK(void) iscsiDump(void *pBackendData)
5390	{
5391	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5392
5393	AssertPtrReturnVoid(pImage);
5394	/** @todo put something useful here */
5395	vdIfErrorMessage(pImage->pIfError, "Header: cVolume=%u\n", pImage->cVolume);
5396	}
5397
5398	/** @copydoc VDIMAGEBACKEND::pfnComposeLocation */
5399	static DECLCALLBACK(int) iscsiComposeLocation(PVDINTERFACE pConfig, char **pszLocation)
5400	{
5401	char *pszTarget = NULL;
5402	char *pszLUN = NULL;
5403	char *pszAddress = NULL;
5404	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5405	if (RT_SUCCESS(rc))
5406	{
5407	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5408	if (RT_SUCCESS(rc))
5409	{
5410	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5411	if (RT_SUCCESS(rc))
5412	{
5413	if (RTStrAPrintf(pszLocation, "iscsi://%s/%s/%s",
5414	pszAddress, pszTarget, pszLUN) < 0)
5415	rc = VERR_NO_MEMORY;
5416	}
5417	}
5418	}
5419	RTMemFree(pszTarget);
5420	RTMemFree(pszLUN);
5421	RTMemFree(pszAddress);
5422	return rc;
5423	}
5424
5425	/** @copydoc VDIMAGEBACKEND::pfnComposeName */
5426	static DECLCALLBACK(int) iscsiComposeName(PVDINTERFACE pConfig, char **pszName)
5427	{
5428	char *pszTarget = NULL;
5429	char *pszLUN = NULL;
5430	char *pszAddress = NULL;
5431	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5432	if (RT_SUCCESS(rc))
5433	{
5434	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5435	if (RT_SUCCESS(rc))
5436	{
5437	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5438	if (RT_SUCCESS(rc))
5439	{
5440	/** @todo think about a nicer looking location scheme for iSCSI */
5441	if (RTStrAPrintf(pszName, "%s/%s/%s",
5442	pszAddress, pszTarget, pszLUN) < 0)
5443	rc = VERR_NO_MEMORY;
5444	}
5445	}
5446	}
5447	RTMemFree(pszTarget);
5448	RTMemFree(pszLUN);
5449	RTMemFree(pszAddress);
5450
5451	return rc;
5452	}
5453
5454
5455	const VDIMAGEBACKEND g_ISCSIBackend =
5456	{
5457	/* u32Version */
5458	VD_IMGBACKEND_VERSION,
5459	/* pszBackendName */
5460	"iSCSI",
5461	/* uBackendCaps */
5462	VD_CAP_CONFIG \| VD_CAP_TCPNET \| VD_CAP_ASYNC,
5463	/* papszFileExtensions */
5464	NULL,
5465	/* paConfigInfo */
5466	s_iscsiConfigInfo,
5467	/* prnProbe */
5468	iscsiProbe,
5469	/* pfnOpen */
5470	iscsiOpen,
5471	/* pfnCreate */
5472	iscsiCreate,
5473	/* pfnRename */
5474	NULL,
5475	/* pfnClose */
5476	iscsiClose,
5477	/* pfnRead */
5478	iscsiRead,
5479	/* pfnWrite */
5480	iscsiWrite,
5481	/* pfnFlush */
5482	iscsiFlush,
5483	/* pfnDiscard */
5484	NULL,
5485	/* pfnGetVersion */
5486	iscsiGetVersion,
5487	/* pfnGetFileSize */
5488	iscsiGetFileSize,
5489	/* pfnGetPCHSGeometry */
5490	iscsiGetPCHSGeometry,
5491	/* pfnSetPCHSGeometry */
5492	iscsiSetPCHSGeometry,
5493	/* pfnGetLCHSGeometry */
5494	iscsiGetLCHSGeometry,
5495	/* pfnSetLCHSGeometry */
5496	iscsiSetLCHSGeometry,
5497	/* pfnQueryRegions */
5498	iscsiQueryRegions,
5499	/* pfnRegionListRelease */
5500	iscsiRegionListRelease,
5501	/* pfnGetImageFlags */
5502	iscsiGetImageFlags,
5503	/* pfnGetOpenFlags */
5504	iscsiGetOpenFlags,
5505	/* pfnSetOpenFlags */
5506	iscsiSetOpenFlags,
5507	/* pfnGetComment */
5508	iscsiGetComment,
5509	/* pfnSetComment */
5510	iscsiSetComment,
5511	/* pfnGetUuid */
5512	iscsiGetUuid,
5513	/* pfnSetUuid */
5514	iscsiSetUuid,
5515	/* pfnGetModificationUuid */
5516	iscsiGetModificationUuid,
5517	/* pfnSetModificationUuid */
5518	iscsiSetModificationUuid,
5519	/* pfnGetParentUuid */
5520	iscsiGetParentUuid,
5521	/* pfnSetParentUuid */
5522	iscsiSetParentUuid,
5523	/* pfnGetParentModificationUuid */
5524	iscsiGetParentModificationUuid,
5525	/* pfnSetParentModificationUuid */
5526	iscsiSetParentModificationUuid,
5527	/* pfnDump */
5528	iscsiDump,
5529	/* pfnGetTimestamp */
5530	NULL,
5531	/* pfnGetParentTimestamp */
5532	NULL,
5533	/* pfnSetParentTimestamp */
5534	NULL,
5535	/* pfnGetParentFilename */
5536	NULL,
5537	/* pfnSetParentFilename */
5538	NULL,
5539	/* pfnComposeLocation */
5540	iscsiComposeLocation,
5541	/* pfnComposeName */
5542	iscsiComposeName,
5543	/* pfnCompact */
5544	NULL,
5545	/* pfnResize */
5546	NULL,
5547	/* pfnRepair */
5548	NULL,
5549	/* pfnTraverseMetadata */
5550	NULL,
5551	/* u32VersionEnd */
5552	VD_IMGBACKEND_VERSION
5553	};

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Storage/ISCSI.cpp@ 97271

Download in other formats: