DBGCIo.cpp@ 103464

Last change on this file since 103464 was 99739, checked in by vboxsync, 18 months ago
*: doxygen corrections (mostly about removing @returns from functions returning void).
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1	/* $Id: DBGCIo.cpp 99739 2023-05-11 01:01:08Z vboxsync $ */
2	/** @file
3	* DBGC - Debugger Console, I/O provider handling.
4	*/
5
6	/*
7	* Copyright (C) 2020-2023 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	#include <VBox/dbg.h>
33	#include <VBox/vmm/cfgm.h>
34	#include <VBox/err.h>
35
36	#include <iprt/mem.h>
37	#include <iprt/thread.h>
38	#include <VBox/log.h>
39	#include <iprt/assert.h>
40
41	#include <iprt/string.h>
42
43	#include "DBGCIoProvInternal.h"
44	#include "DBGCInternal.h"
45
46
47	/*********************************************************************************************************************************
48	* Structures and Typedefs *
49	*********************************************************************************************************************************/
50
51	/**
52	* Stub descriptor.
53	*/
54	typedef struct DBGCSTUB
55	{
56	/** Name of the stub. */
57	const char *pszName;
58	/** Flag whether this is an ASCII based protocol which requires some newline handling. */
59	bool fAscii;
60	/**
61	* The runloop callback.
62	*
63	* @returns VBox status code.
64	* @param pUVM The user mode VM handle.
65	* @param pIo Pointer to the I/O callback table.
66	* @param fFlags Flags for the runloop, MBZ for now.
67	*/
68	DECLCALLBACKMEMBER(int, pfnRunloop, (PUVM pUVM, PCDBGCIO pIo, unsigned fFlags));
69	} DBGCSTUB;
70	/** Pointer to a stub descriptor. */
71	typedef DBGCSTUB *PDBGCSTUB;
72	/** Pointer to a const stub descriptor. */
73	typedef const DBGCSTUB *PCDBGCSTUB;
74
75
76	/** Pointer to the instance data of the debug console I/O. */
77	typedef struct DBGCIOINT *PDBGCIOINT;
78
79
80	/**
81	* A single debug console I/O service.
82	*/
83	typedef struct DBGCIOSVC
84	{
85	/** Pointer to the owning structure. */
86	PDBGCIOINT pDbgcIo;
87	/** The user mode VM handle this service belongs to. */
88	PUVM pUVM;
89	/** The I/O provider registration record for this service. */
90	PCDBGCIOPROVREG pIoProvReg;
91	/** The I/O provider instance. */
92	DBGCIOPROV hDbgcIoProv;
93	/** The stub type. */
94	PCDBGCSTUB pStub;
95	/** The thread managing the service. */
96	RTTHREAD hThreadSvc;
97	/** Pointer to the I/O callback table currently being served. */
98	PCDBGCIO pIo;
99	/** The wrapping DBGC I/O callback table for ASCII based protocols. */
100	DBGCIO IoAscii;
101	} DBGCIOSVC;
102	/** Pointer to a single debug console I/O service. */
103	typedef DBGCIOSVC *PDBGCIOSVC;
104	/** Poitner to a const single debug console I/O service. */
105	typedef const DBGCIOSVC *PCDBGCIOSVC;
106
107
108	/**
109	* Debug console I/O instance data.
110	*/
111	typedef struct DBGCIOINT
112	{
113	/** Number of configured I/O service instances. */
114	volatile uint32_t cSvcsCfg;
115	/** Number of running I/O service instances. */
116	volatile uint32_t cSvcsRunning;
117	/** Flag whether the services were asked to shut down. */
118	volatile bool fShutdown;
119	/** Array of active I/O service instances. */
120	RT_FLEXIBLE_ARRAY_EXTENSION
121	DBGCIOSVC aSvc[RT_FLEXIBLE_ARRAY];
122	} DBGCIOINT;
123
124
125	/*********************************************************************************************************************************
126	* Global Variables *
127	*********************************************************************************************************************************/
128
129	/**
130	* Array of supported I/O providers.
131	*/
132	static PCDBGCIOPROVREG g_aIoProv[] =
133	{
134	&g_DbgcIoProvTcp,
135	&g_DbgcIoProvUdp,
136	&g_DbgcIoProvIpc
137	};
138
139
140	static DECLCALLBACK(int) dbgcIoNativeStubRunloop(PUVM pUVM, PCDBGCIO pIo, unsigned fFlags);
141
142	/**
143	* Array of supported stubs.
144	*/
145	static const DBGCSTUB g_aStubs[] =
146	{
147	/** pszName fAscii pfnRunloop */
148	{ "Native", true, dbgcIoNativeStubRunloop },
149	{ "Gdb", false, dbgcGdbStubRunloop },
150	{ "Kd", false, dbgcKdStubRunloop }
151	};
152
153
154	/*********************************************************************************************************************************
155	* Internal Functions *
156	*********************************************************************************************************************************/
157
158
159	/**
160	* Destroys all allocated data for the given dbeugger console I/O instance.
161	*
162	* @param pDbgcIo Pointer to the dbeugger console I/O instance data.
163	*/
164	static void dbgcIoDestroy(PDBGCIOINT pDbgcIo)
165	{
166	for (uint32_t i = 0; i < pDbgcIo->cSvcsCfg; i++)
167	{
168	PDBGCIOSVC pIoSvc = &pDbgcIo->aSvc[i];
169
170	if (pIoSvc->hThreadSvc != NIL_RTTHREAD)
171	{
172	int rc = RTThreadWait(pIoSvc->hThreadSvc, RT_MS_10SEC, NULL /prc/);
173	AssertRC(rc);
174
175	pIoSvc->hThreadSvc = NIL_RTTHREAD;
176	pIoSvc->pIoProvReg->pfnDestroy(pIoSvc->hDbgcIoProv);
177	}
178	}
179
180	RTMemFree(pDbgcIo);
181	}
182
183
184	/**
185	* Returns the number of I/O services configured.
186	*
187	* @returns I/O service count.
188	* @param pCfgRoot The root of the config.
189	*/
190	static uint32_t dbgcIoGetSvcCount(PCFGMNODE pCfgRoot)
191	{
192	uint32_t cSvcs = 0;
193	PCFGMNODE pNd = CFGMR3GetFirstChild(pCfgRoot);
194	while (pNd)
195	{
196	cSvcs++;
197	pNd = CFGMR3GetNextChild(pNd);
198	}
199
200	return cSvcs;
201	}
202
203
204	/**
205	* Returns a pointer to the I/O provider registration record matching the given name.
206	*
207	* @returns Pointer to the registration record or NULL if not found.
208	* @param pszName The name to look for (case insensitive matching).
209	*/
210	static PCDBGCIOPROVREG dbgcIoProvFindRegByName(const char *pszName)
211	{
212	for (uint32_t i = 0; i < RT_ELEMENTS(g_aIoProv); i++)
213	{
214	if (!RTStrICmp(g_aIoProv[i]->pszName, pszName))
215	return g_aIoProv[i];
216	}
217	return NULL;
218	}
219
220
221	/**
222	* Returns a pointer to the stub record matching the given name.
223	*
224	* @returns Pointer to the stub record or NULL if not found.
225	* @param pszName The name to look for (case insensitive matching).
226	*/
227	static PCDBGCSTUB dbgcIoFindStubByName(const char *pszName)
228	{
229	for (uint32_t i = 0; i < RT_ELEMENTS(g_aStubs); i++)
230	{
231	if (!RTStrICmp(g_aStubs[i].pszName, pszName))
232	return &g_aStubs[i];
233	}
234	return NULL;
235	}
236
237
238	/**
239	* Wrapper around DBGCCreate() to get it working as a callback.
240	*/
241	static DECLCALLBACK(int) dbgcIoNativeStubRunloop(PUVM pUVM, PCDBGCIO pIo, unsigned fFlags)
242	{
243	return DBGCCreate(pUVM, pIo, fFlags);
244	}
245
246
247	/**
248	* @interface_method_impl{DBGCIO,pfnDestroy}
249	*/
250	static DECLCALLBACK(void) dbgcIoAsciiDestroy(PCDBGCIO pIo)
251	{
252	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
253	pIoSvc->pIo->pfnDestroy(pIoSvc->pIo);
254	}
255
256
257	/**
258	* @interface_method_impl{DBGCIO,pfnInput}
259	*/
260	static DECLCALLBACK(bool) dbgcIoAsciiInput(PCDBGCIO pIo, uint32_t cMillies)
261	{
262	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
263	return pIoSvc->pIo->pfnInput(pIoSvc->pIo, cMillies);
264	}
265
266
267	/**
268	* @interface_method_impl{DBGCIO,pfnRead}
269	*/
270	static DECLCALLBACK(int) dbgcIoAsciiRead(PCDBGCIO pIo, void pvBuf, size_t cbBuf, size_t pcbRead)
271	{
272	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
273	return pIoSvc->pIo->pfnRead(pIoSvc->pIo, pvBuf, cbBuf, pcbRead);
274	}
275
276
277	/**
278	* @interface_method_impl{DBGCIO,pfnWrite}
279	*/
280	static DECLCALLBACK(int) dbgcIoAsciiWrite(PCDBGCIO pIo, const void pvBuf, size_t cbBuf, size_t pcbWritten)
281	{
282	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
283
284	/*
285	* convert '\n' to '\r\n' while writing.
286	*/
287	int rc = 0;
288	size_t cbLeft = cbBuf;
289	while (cbLeft)
290	{
291	size_t cb = cbLeft;
292	/* write newlines */
293	if ((const char )pvBuf == '\n')
294	{
295	rc = pIoSvc->pIo->pfnWrite(pIoSvc->pIo, "\r\n", 2, NULL);
296	cb = 1;
297	}
298	/* write till next newline */
299	else
300	{
301	const char pszNL = (const char )memchr(pvBuf, '\n', cbLeft);
302	if (pszNL)
303	cb = (uintptr_t)pszNL - (uintptr_t)pvBuf;
304	rc = pIoSvc->pIo->pfnWrite(pIoSvc->pIo, pvBuf, cb, NULL);
305	}
306	if (RT_FAILURE(rc))
307	break;
308
309	/* advance */
310	cbLeft -= cb;
311	pvBuf = (const char *)pvBuf + cb;
312	}
313
314	/*
315	* Set returned value and return.
316	*/
317	if (pcbWritten)
318	*pcbWritten = cbBuf - cbLeft;
319	return rc;
320	}
321
322
323	/**
324	* @interface_method_impl{DBGCIO,pfnSetReady}
325	*/
326	static DECLCALLBACK(void) dbgcIoAsciiSetReady(PCDBGCIO pIo, bool fReady)
327	{
328	PDBGCIOSVC pIoSvc = RT_FROM_MEMBER(pIo, DBGCIOSVC, IoAscii);
329	return pIoSvc->pIo->pfnSetReady(pIoSvc->pIo, fReady);
330	}
331
332
333	/**
334	* The I/O thread handling the service.
335	*/
336	static DECLCALLBACK(int) dbgcIoSvcThread(RTTHREAD hThreadSelf, void *pvUser)
337	{
338	RT_NOREF(hThreadSelf);
339
340	int rc = VINF_SUCCESS;
341	PDBGCIOSVC pIoSvc = (PDBGCIOSVC)pvUser;
342	PDBGCIOINT pDbgcIo = pIoSvc->pDbgcIo;
343	PCDBGCIOPROVREG pIoProvReg = pIoSvc->pIoProvReg;
344
345	while (!ASMAtomicReadBool(&pDbgcIo->fShutdown))
346	{
347	/* Wait until someone connects. */
348	rc = pIoProvReg->pfnWaitForConnect(pIoSvc->hDbgcIoProv, RT_INDEFINITE_WAIT, &pIoSvc->pIo);
349	if (RT_SUCCESS(rc))
350	{
351	PCDBGCIO pIo = pIoSvc->pIo;
352
353	if (pIoSvc->pStub->fAscii)
354	{
355	pIoSvc->IoAscii.pfnDestroy = dbgcIoAsciiDestroy;
356	pIoSvc->IoAscii.pfnInput = dbgcIoAsciiInput;
357	pIoSvc->IoAscii.pfnRead = dbgcIoAsciiRead;
358	pIoSvc->IoAscii.pfnWrite = dbgcIoAsciiWrite;
359	pIoSvc->IoAscii.pfnSetReady = dbgcIoAsciiSetReady;
360	pIo = &pIoSvc->IoAscii;
361	}
362
363	/* call the runloop for the connection. */
364	pIoSvc->pStub->pfnRunloop(pIoSvc->pUVM, pIo, 0 /fFlags/);
365
366	pIo->pfnDestroy(pIo);
367	}
368	else if ( rc != VERR_TIMEOUT
369	&& rc != VERR_INTERRUPTED)
370	break;
371	}
372
373	if (!ASMAtomicDecU32(&pDbgcIo->cSvcsRunning))
374	dbgcIoDestroy(pDbgcIo);
375
376	return rc;
377	}
378
379
380	static int dbgcIoSvcInitWorker(PUVM pUVM, PDBGCIOSVC pIoSvc, PCDBGCIOPROVREG pIoProvReg,
381	PCDBGCSTUB pStub, PCFGMNODE pCfg, const char *pszName,
382	bool fIgnoreNetAddrInUse)
383	{
384	pIoSvc->pUVM = pUVM;
385	pIoSvc->pIoProvReg = pIoProvReg;
386	pIoSvc->pStub = pStub;
387
388	/* Create the provider instance and spawn the dedicated thread handling that service. */
389	int rc = pIoProvReg->pfnCreate(&pIoSvc->hDbgcIoProv, pCfg);
390	if (RT_SUCCESS(rc))
391	{
392	rc = RTThreadCreateF(&pIoSvc->hThreadSvc, dbgcIoSvcThread, pIoSvc, 0 /cbStack/,
393	RTTHREADTYPE_DEBUGGER, RTTHREADFLAGS_WAITABLE, "DbgcThrd-%s", pszName);
394	if (RT_SUCCESS(rc))
395	{
396	ASMAtomicIncU32(&pIoSvc->pDbgcIo->cSvcsRunning);
397	return VINF_SUCCESS;
398	}
399	else
400	rc = VMR3SetError(pUVM, rc, RT_SRC_POS,
401	"Configuration error: Creating an instance of the service \"%s\" failed",
402	pszName);
403
404	pIoProvReg->pfnDestroy(pIoSvc->hDbgcIoProv);
405	}
406	else if ( rc != VERR_NET_ADDRESS_IN_USE
407	\|\| !fIgnoreNetAddrInUse)
408	rc = VMR3SetError(pUVM, rc, RT_SRC_POS,
409	"Configuration error: Creating an instance of the I/O provider \"%s\" failed",
410	pIoProvReg->pszName);
411
412	return rc;
413	}
414
415
416	/**
417	* Tries to initialize the given I/O service from the given config.
418	*
419	* @returns VBox status code.
420	* @param pUVM The user mode VM handle.
421	* @param pIoSvc The I/O service instance to initialize.
422	* @param pCfg The config for the instance.
423	*/
424	static int dbgcIoSvcInit(PUVM pUVM, PDBGCIOSVC pIoSvc, PCFGMNODE pCfg)
425	{
426	char szName[32 + 1]; RT_ZERO(szName);
427	int rc = CFGMR3GetName(pCfg, &szName[0], sizeof(szName));
428	if (RT_SUCCESS(rc))
429	{
430	char szIoProvName[32 + 1]; RT_ZERO(szIoProvName);
431	rc = CFGMR3QueryString(pCfg, "Provider", &szIoProvName[0], sizeof(szIoProvName));
432	if (RT_SUCCESS(rc))
433	{
434	char szStub[32 + 1]; RT_ZERO(szStub);
435	rc = CFGMR3QueryString(pCfg, "StubType", &szStub[0], sizeof(szStub));
436	if (RT_SUCCESS(rc))
437	{
438	PCDBGCIOPROVREG pIoProvReg = dbgcIoProvFindRegByName(szIoProvName);
439	if (pIoProvReg)
440	{
441	PCDBGCSTUB pStub = dbgcIoFindStubByName(szStub);
442	if (pStub)
443	rc = dbgcIoSvcInitWorker(pUVM, pIoSvc, pIoProvReg, pStub, pCfg, szName,
444	false /fIgnoreNetAddrInUse/);
445	else
446	rc = VMR3SetError(pUVM, VERR_NOT_FOUND, RT_SRC_POS, "Configuration error: The stub type \"%s\" could not be found",
447	szStub);
448	}
449	else
450	rc = VMR3SetError(pUVM, VERR_NOT_FOUND, RT_SRC_POS, "Configuration error: The provider \"%s\" could not be found",
451	szIoProvName);
452	}
453	else
454	rc = VM_SET_ERROR_U(pUVM, rc, "Configuration error: Querying \"StubType\" failed");
455	}
456	else
457	rc = VM_SET_ERROR_U(pUVM, rc, "Configuration error: Querying \"Provider\" failed");
458	}
459	else
460	rc = VM_SET_ERROR_U(pUVM, rc, "Configuration error: Querying service identifier failed (maybe too long)");
461
462	return rc;
463	}
464
465
466	/**
467	* Creates the DBGC I/O services from the legacy TCP config.
468	*
469	* @returns VBox status code.
470	* @param pUVM The user mode VM handle.
471	* @param pKey The config key.
472	* @param ppvData Where to store the I/o instance data on success.
473	*/
474	static int dbgcIoCreateLegacyTcp(PUVM pUVM, PCFGMNODE pKey, void **ppvData)
475	{
476	bool fEnabled;
477	int rc = CFGMR3QueryBoolDef(pKey, "Enabled", &fEnabled,
478	#if defined(VBOX_WITH_DEBUGGER) && defined(VBOX_WITH_DEBUGGER_TCP_BY_DEFAULT)
479	true
480	#else
481	false
482	#endif
483	);
484	if (RT_FAILURE(rc))
485	return VM_SET_ERROR_U(pUVM, rc, "Configuration error: Failed querying \"DBGC/Enabled\"");
486
487	if (!fEnabled)
488	{
489	LogFlow(("DBGCTcpCreate: returns VINF_SUCCESS (Disabled)\n"));
490	return VINF_SUCCESS;
491	}
492
493	PDBGCIOINT pDbgcIo = (PDBGCIOINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGCIOINT, aSvc[1]));
494	if (RT_LIKELY(pDbgcIo))
495	{
496	pDbgcIo->aSvc[0].pDbgcIo = pDbgcIo;
497	pDbgcIo->cSvcsCfg = 1;
498	pDbgcIo->cSvcsRunning = 1;
499	rc = dbgcIoSvcInitWorker(pUVM, &pDbgcIo->aSvc[0], &g_DbgcIoProvTcp, &g_aStubs[0], pKey, "TCP",
500	true /fIgnoreNetAddrInUse/);
501	if (RT_SUCCESS(rc))
502	{
503	*ppvData = pDbgcIo;
504	return VINF_SUCCESS;
505	}
506
507	RTMemFree(pDbgcIo);
508	if (rc == VERR_NET_ADDRESS_IN_USE)
509	rc = VINF_SUCCESS;
510	}
511	else
512	rc = VERR_NO_MEMORY;
513
514	if (RT_FAILURE(rc))
515	rc = VM_SET_ERROR_U(pUVM, rc, "Cannot start TCP-based debugging console service");
516	return rc;
517	}
518
519
520	/**
521	* Sets up debugger I/O based on the VM config.
522	*
523	* @returns VBox status code.
524	* @param pUVM The user mode VM handle.
525	* @param ppvData Where to store a pointer to the instance data.
526	*/
527	DBGDECL(int) DBGCIoCreate(PUVM pUVM, void **ppvData)
528	{
529	/*
530	* Check what the configuration says.
531	*/
532	PCFGMNODE pKey = CFGMR3GetChild(CFGMR3GetRootU(pUVM), "DBGC");
533	uint32_t cSvcs = dbgcIoGetSvcCount(pKey);
534	int rc = VINF_SUCCESS;
535
536	/* If no services are configured try the legacy config supporting TCP only. */
537	if (cSvcs)
538	{
539	PDBGCIOINT pDbgcIo = (PDBGCIOINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGCIOINT, aSvc[cSvcs]));
540	if (RT_LIKELY(pDbgcIo))
541	{
542	pDbgcIo->cSvcsCfg = 0;
543	pDbgcIo->cSvcsRunning = 1;
544	pDbgcIo->fShutdown = false;
545
546	for (uint32_t i = 0; i < cSvcs; i++)
547	pDbgcIo->aSvc[i].hThreadSvc = NIL_RTTHREAD;
548
549	PCFGMNODE pSvcCfg = CFGMR3GetFirstChild(pKey);
550	for (uint32_t i = 0; i < cSvcs && RT_SUCCESS(rc); i++)
551	{
552	pDbgcIo->aSvc[i].pDbgcIo = pDbgcIo;
553
554	rc = dbgcIoSvcInit(pUVM, &pDbgcIo->aSvc[i], pSvcCfg);
555	if (RT_SUCCESS(rc))
556	pDbgcIo->cSvcsCfg++;
557	else
558	rc = VM_SET_ERROR_U(pUVM, rc, "Failed to initialize the debugger I/O service");
559
560	pSvcCfg = CFGMR3GetNextChild(pSvcCfg);
561	}
562
563	if (RT_SUCCESS(rc))
564	*ppvData = pDbgcIo;
565	else
566	{
567	if (!ASMAtomicDecU32(&pDbgcIo->cSvcsRunning))
568	dbgcIoDestroy(pDbgcIo);
569	}
570	}
571	else
572	rc = VM_SET_ERROR_U(pUVM, VERR_NO_MEMORY, "Failed to allocate memory for the debugger I/O service");
573	}
574	else
575	rc = dbgcIoCreateLegacyTcp(pUVM, pKey, ppvData);
576
577	return rc;
578	}
579
580
581	/**
582	* Terminates any running debugger services.
583	*
584	* @returns VBox status code.
585	* @param pUVM The user mode VM handle.
586	* @param pvData The data returned by DBGCIoCreate.
587	*/
588	DBGDECL(int) DBGCIoTerminate(PUVM pUVM, void *pvData)
589	{
590	RT_NOREF(pUVM);
591	PDBGCIOINT pDbgcIo = (PDBGCIOINT)pvData;
592
593	if (pDbgcIo)
594	{
595	ASMAtomicXchgBool(&pDbgcIo->fShutdown, true);
596
597	for (uint32_t i = 0; i < pDbgcIo->cSvcsCfg; i++)
598	{
599	PDBGCIOSVC pIoSvc = &pDbgcIo->aSvc[i];
600
601	if (pIoSvc->hThreadSvc != NIL_RTTHREAD)
602	pIoSvc->pIoProvReg->pfnWaitInterrupt(pIoSvc->hDbgcIoProv);
603	}
604
605	if (!ASMAtomicDecU32(&pDbgcIo->cSvcsRunning))
606	dbgcIoDestroy(pDbgcIo);
607	}
608
609	return VINF_SUCCESS;
610	}
611

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source: vbox/trunk/src/VBox/Debugger/DBGCIo.cpp@ 103464

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