VBoxNetDhcpd.cpp@ 82968

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1	/* $Id: VBoxNetDhcpd.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* VBoxNetDhcpd - DHCP server for host-only and NAT networks.
4	*/
5
6	/*
7	* Copyright (C) 2009-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/** @page pg_net_dhcp VBoxNetDHCP
20	*
21	* Write a few words...
22	*
23	*/
24
25
26	/*********************************************************************************************************************************
27	* Header Files *
28	*********************************************************************************************************************************/
29	#include <iprt/cdefs.h>
30
31	/*
32	* Need to get host/network order conversion stuff from Windows headers,
33	* so we do not define them in LWIP and then try to re-define them in
34	* Windows headers.
35	*/
36	#ifdef RT_OS_WINDOWS
37	# include <iprt/win/winsock2.h>
38	#endif
39
40	#include "DhcpdInternal.h"
41	#include <iprt/param.h>
42	#include <iprt/errcore.h>
43
44	#include <iprt/initterm.h>
45	#include <iprt/message.h>
46
47	#include <iprt/net.h>
48	#include <iprt/path.h>
49	#include <iprt/stream.h>
50
51	#include <VBox/sup.h>
52	#include <VBox/vmm/vmm.h>
53	#include <VBox/vmm/pdmnetinline.h>
54	#include <VBox/intnet.h>
55	#include <VBox/intnetinline.h>
56
57	#include "VBoxLwipCore.h"
58	#include "Config.h"
59	#include "DHCPD.h"
60	#include "DhcpMessage.h"
61
62	extern "C"
63	{
64	#include "lwip/sys.h"
65	#include "lwip/pbuf.h"
66	#include "lwip/netif.h"
67	#include "lwip/tcpip.h"
68	#include "lwip/udp.h"
69	#include "netif/etharp.h"
70	}
71
72	#include <string>
73	#include <vector>
74	#include <memory>
75
76	#ifdef RT_OS_WINDOWS
77	# include <iprt/win/windows.h>
78	#endif
79
80	struct delete_pbuf
81	{
82	delete_pbuf() {}
83	void operator()(struct pbuf *p) const { pbuf_free(p); }
84	};
85
86	typedef std::unique_ptr<pbuf, delete_pbuf> unique_ptr_pbuf;
87
88
89	#define CALL_VMMR0(op, req) \
90	(SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, (op), 0, &(req).Hdr))
91
92
93	class VBoxNetDhcpd
94	{
95	DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(VBoxNetDhcpd);
96
97	private:
98	PRTLOGGER m_pStderrReleaseLogger;
99
100	/* intnet plumbing */
101	PSUPDRVSESSION m_pSession;
102	INTNETIFHANDLE m_hIf;
103	PINTNETBUF m_pIfBuf;
104
105	/* lwip stack connected to the intnet */
106	struct netif m_LwipNetif;
107
108	Config *m_Config;
109
110	/* listening pcb */
111	struct udp_pcb *m_Dhcp4Pcb;
112
113	DHCPD m_server;
114
115	public:
116	VBoxNetDhcpd();
117	~VBoxNetDhcpd();
118
119	int main(int argc, char **argv);
120
121	private:
122	int logInitStderr();
123
124	/*
125	* Boilerplate code.
126	*/
127	int r3Init();
128	void r3Fini();
129
130	int vmmInit();
131
132	int ifInit(const RTCString &strNetwork,
133	const RTCString &strTrunk = RTCString(),
134	INTNETTRUNKTYPE enmTrunkType = kIntNetTrunkType_WhateverNone);
135	int ifOpen(const RTCString &strNetwork,
136	const RTCString &strTrunk,
137	INTNETTRUNKTYPE enmTrunkType);
138	int ifGetBuf();
139	int ifActivate();
140
141	int ifWait(uint32_t cMillies = RT_INDEFINITE_WAIT);
142	int ifProcessInput();
143	int ifFlush();
144
145	int ifClose();
146
147	void ifPump();
148	int ifInput(void *pvSegFrame, uint32_t cbSegFrame);
149
150	int ifOutput(PCINTNETSEG paSegs, size_t cSegs, size_t cbFrame);
151
152
153	/*
154	* lwIP callbacks
155	*/
156	static DECLCALLBACK(void) lwipInitCB(void *pvArg);
157	void lwipInit();
158
159	static err_t netifInitCB(netif *pNetif);
160	err_t netifInit(netif *pNetif);
161
162	static err_t netifLinkOutputCB(netif pNetif, pbuf pPBuf);
163	err_t netifLinkOutput(pbuf *pPBuf);
164
165	static void dhcp4RecvCB(void arg, struct udp_pcb pcb, struct pbuf *p,
166	ip_addr_t *addr, u16_t port);
167	void dhcp4Recv(struct udp_pcb pcb, struct pbuf p, ip_addr_t *addr, u16_t port);
168	};
169
170
171	VBoxNetDhcpd::VBoxNetDhcpd()
172	: m_pStderrReleaseLogger(NULL),
173	m_pSession(NIL_RTR0PTR),
174	m_hIf(INTNET_HANDLE_INVALID),
175	m_pIfBuf(NULL),
176	m_LwipNetif(),
177	m_Config(NULL),
178	m_Dhcp4Pcb(NULL)
179	{
180	int rc;
181
182	logInitStderr();
183
184	rc = r3Init();
185	if (RT_FAILURE(rc))
186	return;
187
188	vmmInit();
189	}
190
191
192	VBoxNetDhcpd::~VBoxNetDhcpd()
193	{
194	ifClose();
195	r3Fini();
196	}
197
198
199	/*
200	* We don't know the name of the release log file until we parse our
201	* configuration because we use network name as basename. To get
202	* early logging to work, start with stderr-only release logger.
203	*
204	* We disable "sup" for this logger to avoid spam from SUPR3Init().
205	*/
206	int VBoxNetDhcpd::logInitStderr()
207	{
208	static const char * const s_apszGroups[] = VBOX_LOGGROUP_NAMES;
209
210	PRTLOGGER pLogger;
211	int rc;
212
213	uint32_t fFlags = 0;
214	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
215	fFlags \|= RTLOGFLAGS_USECRLF;
216	#endif
217
218	rc = RTLogCreate(&pLogger, fFlags,
219	"all -sup all.restrict -default.restrict",
220	NULL, /* environment base */
221	RT_ELEMENTS(s_apszGroups), s_apszGroups,
222	RTLOGDEST_STDERR, NULL);
223	if (RT_FAILURE(rc))
224	{
225	RTPrintf("Failed to init stderr logger: %Rrs\n", rc);
226	return rc;
227	}
228
229	m_pStderrReleaseLogger = pLogger;
230	RTLogRelSetDefaultInstance(m_pStderrReleaseLogger);
231
232	return VINF_SUCCESS;
233	}
234
235
236	int VBoxNetDhcpd::r3Init()
237	{
238	AssertReturn(m_pSession == NIL_RTR0PTR, VERR_GENERAL_FAILURE);
239
240	int rc = SUPR3Init(&m_pSession);
241	return rc;
242	}
243
244
245	void VBoxNetDhcpd::r3Fini()
246	{
247	if (m_pSession == NIL_RTR0PTR)
248	return;
249
250	SUPR3Term();
251	m_pSession = NIL_RTR0PTR;
252	}
253
254
255	int VBoxNetDhcpd::vmmInit()
256	{
257	char szPathVMMR0[RTPATH_MAX];
258	int rc = RTPathExecDir(szPathVMMR0, sizeof(szPathVMMR0));
259	if (RT_SUCCESS(rc))
260	rc = RTPathAppend(szPathVMMR0, sizeof(szPathVMMR0), "VMMR0.r0");
261	if (RT_SUCCESS(rc))
262	rc = SUPR3LoadVMM(szPathVMMR0);
263	return rc;
264	}
265
266
267	int VBoxNetDhcpd::ifInit(const RTCString &strNetwork,
268	const RTCString &strTrunk,
269	INTNETTRUNKTYPE enmTrunkType)
270	{
271	int rc;
272
273	rc = ifOpen(strNetwork, strTrunk, enmTrunkType);
274	if (RT_FAILURE(rc))
275	return rc;
276
277	rc = ifGetBuf();
278	if (RT_FAILURE(rc))
279	return rc;
280
281	rc = ifActivate();
282	if (RT_FAILURE(rc))
283	return rc;
284
285	return VINF_SUCCESS;
286	}
287
288
289	int VBoxNetDhcpd::ifOpen(const RTCString &strNetwork,
290	const RTCString &strTrunk,
291	INTNETTRUNKTYPE enmTrunkType)
292	{
293	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
294	AssertReturn(m_hIf == INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
295
296	INTNETOPENREQ OpenReq;
297	RT_ZERO(OpenReq);
298
299	OpenReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
300	OpenReq.Hdr.cbReq = sizeof(OpenReq);
301	OpenReq.pSession = m_pSession;
302
303	int rc = RTStrCopy(OpenReq.szNetwork, sizeof(OpenReq.szNetwork), strNetwork.c_str());
304	AssertRCReturn(rc, rc);
305
306	rc = RTStrCopy(OpenReq.szTrunk, sizeof(OpenReq.szTrunk), strTrunk.c_str());
307	AssertRCReturn(rc, rc);
308
309	if (enmTrunkType != kIntNetTrunkType_Invalid)
310	OpenReq.enmTrunkType = enmTrunkType;
311	else
312	OpenReq.enmTrunkType = kIntNetTrunkType_WhateverNone;
313
314	OpenReq.fFlags = 0;
315	OpenReq.cbSend = _128K;
316	OpenReq.cbRecv = _256K;
317
318	OpenReq.hIf = INTNET_HANDLE_INVALID;
319
320	rc = CALL_VMMR0(VMMR0_DO_INTNET_OPEN, OpenReq);
321	if (RT_FAILURE(rc))
322	return rc;
323
324	m_hIf = OpenReq.hIf;
325	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
326
327	return VINF_SUCCESS;
328	}
329
330
331	int VBoxNetDhcpd::ifGetBuf()
332	{
333	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
334	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
335	AssertReturn(m_pIfBuf == NULL, VERR_GENERAL_FAILURE);
336
337	INTNETIFGETBUFFERPTRSREQ GetBufferPtrsReq;
338	int rc;
339
340	GetBufferPtrsReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
341	GetBufferPtrsReq.Hdr.cbReq = sizeof(GetBufferPtrsReq);
342	GetBufferPtrsReq.pSession = m_pSession;
343	GetBufferPtrsReq.hIf = m_hIf;
344
345	GetBufferPtrsReq.pRing0Buf = NIL_RTR0PTR;
346	GetBufferPtrsReq.pRing3Buf = NULL;
347
348	rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_GET_BUFFER_PTRS, GetBufferPtrsReq);
349	if (RT_FAILURE(rc))
350	return rc;
351
352	m_pIfBuf = GetBufferPtrsReq.pRing3Buf;
353	AssertReturn(m_pIfBuf != NULL, VERR_GENERAL_FAILURE);
354
355	return VINF_SUCCESS;
356	}
357
358
359	int VBoxNetDhcpd::ifActivate()
360	{
361	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
362	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
363	AssertReturn(m_pIfBuf != NULL, VERR_GENERAL_FAILURE);
364
365	INTNETIFSETACTIVEREQ ActiveReq;
366	int rc;
367
368	ActiveReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
369	ActiveReq.Hdr.cbReq = sizeof(ActiveReq);
370	ActiveReq.pSession = m_pSession;
371	ActiveReq.hIf = m_hIf;
372
373	ActiveReq.fActive = 1;
374
375	rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_SET_ACTIVE, ActiveReq);
376	return rc;
377	}
378
379
380	void VBoxNetDhcpd::ifPump()
381	{
382	for (;;)
383	{
384	int rc = ifWait();
385	if ( rc != VERR_INTERRUPTED
386	#if 0 /* we wait indefinitely */
387	&& rc != VERR_TIMEOUT
388	#endif
389	)
390	ifProcessInput();
391	else
392	{
393	DHCP_LOG_MSG_ERROR(("ifWait failed: %Rrc\n", rc));
394	return;
395	}
396	}
397	}
398
399
400	int VBoxNetDhcpd::ifWait(uint32_t cMillies)
401	{
402	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
403	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
404
405	INTNETIFWAITREQ WaitReq;
406	int rc;
407
408	WaitReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
409	WaitReq.Hdr.cbReq = sizeof(WaitReq);
410	WaitReq.pSession = m_pSession;
411	WaitReq.hIf = m_hIf;
412
413	WaitReq.cMillies = cMillies;
414
415	rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_WAIT, WaitReq);
416	return rc;
417	}
418
419
420	int VBoxNetDhcpd::ifProcessInput()
421	{
422	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
423	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
424	AssertReturn(m_pIfBuf != NULL, VERR_GENERAL_FAILURE);
425
426	for (PCINTNETHDR pHdr;
427	(pHdr = IntNetRingGetNextFrameToRead(&m_pIfBuf->Recv)) != NULL;
428	IntNetRingSkipFrame(&m_pIfBuf->Recv))
429	{
430	const uint8_t u8Type = pHdr->u8Type;
431	void *pvSegFrame;
432	uint32_t cbSegFrame;
433
434	if (u8Type == INTNETHDR_TYPE_FRAME)
435	{
436	pvSegFrame = IntNetHdrGetFramePtr(pHdr, m_pIfBuf);
437	cbSegFrame = pHdr->cbFrame;
438
439	ifInput(pvSegFrame, cbSegFrame);
440	}
441	else if (u8Type == INTNETHDR_TYPE_GSO)
442	{
443	PCPDMNETWORKGSO pGso;
444	size_t cbGso = pHdr->cbFrame;
445	size_t cbFrame = cbGso - sizeof(PDMNETWORKGSO);
446
447	pGso = IntNetHdrGetGsoContext(pHdr, m_pIfBuf);
448	if (!PDMNetGsoIsValid(pGso, cbGso, cbFrame))
449	continue;
450
451	const uint32_t cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
452	for (uint32_t i = 0; i < cSegs; ++i)
453	{
454	uint8_t abHdrScratch[256];
455	pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t *)(pGso + 1), cbFrame,
456	abHdrScratch,
457	i, cSegs,
458	&cbSegFrame);
459	ifInput(pvSegFrame, (uint32_t)cbFrame);
460	}
461	}
462	}
463
464	return VINF_SUCCESS;
465	}
466
467
468	/**
469	* Got a frame from the internal network, feed it to the lwIP stack.
470	*/
471	int VBoxNetDhcpd::ifInput(void *pvFrame, uint32_t cbFrame)
472	{
473	if (pvFrame == NULL)
474	return VERR_INVALID_PARAMETER;
475
476	if ( cbFrame <= sizeof(RTNETETHERHDR)
477	\|\| cbFrame > UINT16_MAX - ETH_PAD_SIZE)
478	return VERR_INVALID_PARAMETER;
479
480	struct pbuf *p = pbuf_alloc(PBUF_RAW, (u16_t)cbFrame + ETH_PAD_SIZE, PBUF_POOL);
481	if (RT_UNLIKELY(p == NULL))
482	return VERR_NO_MEMORY;
483
484	/*
485	* The code below is inlined version of:
486	*
487	* pbuf_header(p, -ETH_PAD_SIZE); // hide padding
488	* pbuf_take(p, pvFrame, cbFrame);
489	* pbuf_header(p, ETH_PAD_SIZE); // reveal padding
490	*/
491	struct pbuf *q = p;
492	uint8_t pbChunk = (uint8_t )pvFrame;
493	do {
494	uint8_t payload = (uint8_t )q->payload;
495	size_t len = q->len;
496
497	#if ETH_PAD_SIZE
498	if (RT_LIKELY(q == p)) /* single pbuf is large enough */
499	{
500	payload += ETH_PAD_SIZE;
501	len -= ETH_PAD_SIZE;
502	}
503	#endif
504	memcpy(payload, pbChunk, len);
505	pbChunk += len;
506	q = q->next;
507	} while (RT_UNLIKELY(q != NULL));
508
509	m_LwipNetif.input(p, &m_LwipNetif);
510	return VINF_SUCCESS;
511	}
512
513
514	/**
515	* Got a frame from the lwIP stack, feed it to the internal network.
516	*/
517	err_t VBoxNetDhcpd::netifLinkOutput(pbuf *pPBuf)
518	{
519	PINTNETHDR pHdr;
520	void *pvFrame;
521	u16_t cbFrame;
522	int rc;
523
524	if (pPBuf->tot_len < sizeof(struct eth_hdr)) /* includes ETH_PAD_SIZE */
525	return ERR_ARG;
526
527	cbFrame = pPBuf->tot_len - ETH_PAD_SIZE;
528	rc = IntNetRingAllocateFrame(&m_pIfBuf->Send, cbFrame, &pHdr, &pvFrame);
529	if (RT_FAILURE(rc))
530	return ERR_MEM;
531
532	pbuf_copy_partial(pPBuf, pvFrame, cbFrame, ETH_PAD_SIZE);
533	IntNetRingCommitFrameEx(&m_pIfBuf->Send, pHdr, cbFrame);
534
535	ifFlush();
536	return ERR_OK;
537	}
538
539
540	int VBoxNetDhcpd::ifFlush()
541	{
542	INTNETIFSENDREQ SendReq;
543	int rc;
544
545	SendReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
546	SendReq.Hdr.cbReq = sizeof(SendReq);
547	SendReq.pSession = m_pSession;
548
549	SendReq.hIf = m_hIf;
550
551	rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_SEND, SendReq);
552	return rc;
553	}
554
555
556	int VBoxNetDhcpd::ifClose()
557	{
558	if (m_hIf == INTNET_HANDLE_INVALID)
559	return VINF_SUCCESS;
560
561	INTNETIFCLOSEREQ CloseReq;
562
563	CloseReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
564	CloseReq.Hdr.cbReq = sizeof(CloseReq);
565	CloseReq.pSession = m_pSession;
566
567	CloseReq.hIf = m_hIf;
568
569	m_hIf = INTNET_HANDLE_INVALID;
570	m_pIfBuf = NULL;
571
572	CALL_VMMR0(VMMR0_DO_INTNET_IF_CLOSE, CloseReq);
573	return VINF_SUCCESS;
574	}
575
576
577	/* static / DECLCALLBACK(void) VBoxNetDhcpd::lwipInitCB(void pvArg)
578	{
579	AssertPtrReturnVoid(pvArg);
580
581	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(pvArg);
582	self->lwipInit();
583	}
584
585
586	/* static / err_t VBoxNetDhcpd::netifInitCB(netif pNetif)
587	{
588	AssertPtrReturn(pNetif, ERR_ARG);
589
590	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(pNetif->state);
591	return self->netifInit(pNetif);
592	}
593
594
595	/* static / err_t VBoxNetDhcpd::netifLinkOutputCB(netif pNetif, pbuf *pPBuf)
596	{
597	AssertPtrReturn(pNetif, ERR_ARG);
598	AssertPtrReturn(pPBuf, ERR_ARG);
599
600	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(pNetif->state);
601	AssertPtrReturn(self, ERR_IF);
602
603	return self->netifLinkOutput(pPBuf);
604	}
605
606
607	/* static / void VBoxNetDhcpd::dhcp4RecvCB(void arg, struct udp_pcb *pcb,
608	struct pbuf *p,
609	ip_addr_t *addr, u16_t port)
610	{
611	AssertPtrReturnVoid(arg);
612
613	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(arg);
614	self->dhcp4Recv(pcb, p, addr, port);
615	pbuf_free(p);
616	}
617
618
619
620
621
622	int VBoxNetDhcpd::main(int argc, char **argv)
623	{
624	/*
625	* Register string format types.
626	*/
627	ClientId::registerFormat();
628	Binding::registerFormat();
629
630	/*
631	* Parse the command line into a configuration object.
632	*/
633	m_Config = Config::create(argc, argv);
634	if (m_Config == NULL)
635	return VERR_GENERAL_FAILURE;
636
637	/*
638	* Initialize the server.
639	*/
640	int rc = m_server.init(m_Config);
641	if (RT_SUCCESS(rc))
642	{
643	/* connect to the intnet */
644	rc = ifInit(m_Config->getNetwork(), m_Config->getTrunk(), m_Config->getTrunkType());
645	if (RT_SUCCESS(rc))
646	{
647	/* setup lwip */
648	rc = vboxLwipCoreInitialize(lwipInitCB, this);
649	if (RT_SUCCESS(rc))
650	{
651	/*
652	* Pump packets more or less for ever.
653	*/
654	ifPump();
655	}
656	else
657	DHCP_LOG_MSG_ERROR(("Terminating - vboxLwipCoreInitialize failed: %Rrc\n", rc));
658	}
659	else
660	DHCP_LOG_MSG_ERROR(("Terminating - ifInit failed: %Rrc\n", rc));
661	}
662	else
663	DHCP_LOG_MSG_ERROR(("Terminating - Dhcpd::init failed: %Rrc\n", rc));
664	return rc;
665	}
666
667
668	void VBoxNetDhcpd::lwipInit()
669	{
670	err_t error;
671
672	ip_addr_t addr, mask;
673	ip4_addr_set_u32(&addr, m_Config->getIPv4Address().u);
674	ip4_addr_set_u32(&mask, m_Config->getIPv4Netmask().u);
675
676	netif *pNetif = netif_add(&m_LwipNetif,
677	&addr, &mask,
678	IP_ADDR_ANY, /* gateway */
679	this, /* state */
680	VBoxNetDhcpd::netifInitCB, /* netif_init_fn */
681	tcpip_input); /* netif_input_fn */
682	if (pNetif == NULL)
683	return;
684
685	netif_set_up(pNetif);
686	netif_set_link_up(pNetif);
687
688	m_Dhcp4Pcb = udp_new();
689	if (RT_UNLIKELY(m_Dhcp4Pcb == NULL))
690	return; /* XXX? */
691
692	ip_set_option(m_Dhcp4Pcb, SOF_BROADCAST);
693	udp_recv(m_Dhcp4Pcb, dhcp4RecvCB, this);
694
695	error = udp_bind(m_Dhcp4Pcb, IP_ADDR_ANY, RTNETIPV4_PORT_BOOTPS);
696	if (error != ERR_OK)
697	{
698	udp_remove(m_Dhcp4Pcb);
699	m_Dhcp4Pcb = NULL;
700	return; /* XXX? */
701	}
702	}
703
704
705	err_t VBoxNetDhcpd::netifInit(netif *pNetif)
706	{
707	pNetif->hwaddr_len = sizeof(RTMAC);
708	memcpy(pNetif->hwaddr, &m_Config->getMacAddress(), sizeof(RTMAC));
709
710	pNetif->mtu = 1500;
711
712	pNetif->flags = NETIF_FLAG_BROADCAST
713	\| NETIF_FLAG_ETHARP
714	\| NETIF_FLAG_ETHERNET;
715
716	pNetif->linkoutput = netifLinkOutputCB;
717	pNetif->output = etharp_output;
718
719	netif_set_default(pNetif);
720	return ERR_OK;
721	}
722
723
724	void VBoxNetDhcpd::dhcp4Recv(struct udp_pcb pcb, struct pbuf p,
725	ip_addr_t *addr, u16_t port)
726	{
727	RT_NOREF(pcb, addr, port);
728
729	if (RT_UNLIKELY(p->next != NULL))
730	return; /* XXX: we want it in one chunk */
731
732	bool broadcasted = ip_addr_cmp(ip_current_dest_addr(), &ip_addr_broadcast)
733	\|\| ip_addr_cmp(ip_current_dest_addr(), &ip_addr_any);
734
735	try
736	{
737	DhcpClientMessage *msgIn = DhcpClientMessage::parse(broadcasted, p->payload, p->len);
738	if (msgIn == NULL)
739	return;
740
741	std::unique_ptr<DhcpClientMessage> autoFreeMsgIn(msgIn);
742
743	DhcpServerMessage msgOut = m_server.process(msgIn);
744	if (msgOut == NULL)
745	return;
746
747	std::unique_ptr<DhcpServerMessage> autoFreeMsgOut(msgOut);
748
749	ip_addr_t dst = { msgOut->dst().u };
750	if (ip_addr_cmp(&dst, &ip_addr_any))
751	ip_addr_copy(dst, ip_addr_broadcast);
752
753	octets_t data;
754	int rc = msgOut->encode(data);
755	if (RT_FAILURE(rc))
756	return;
757
758	unique_ptr_pbuf q ( pbuf_alloc(PBUF_RAW, (u16_t)data.size(), PBUF_RAM) );
759	if (!q)
760	return;
761
762	err_t error = pbuf_take(q.get(), &data.front(), (u16_t)data.size());
763	if (error != ERR_OK)
764	return;
765
766	error = udp_sendto(pcb, q.get(), &dst, RTNETIPV4_PORT_BOOTPC);
767	if (error != ERR_OK)
768	return;
769	}
770	catch (std::bad_alloc &)
771	{
772	LogRel(("VBoxNetDhcpd::dhcp4Recv: Caught std::bad_alloc!\n"));
773	}
774	}
775
776
777
778
779	/*
780	* Entry point.
781	*/
782	extern "C" DECLEXPORT(int) TrustedMain(int argc, char **argv)
783	{
784	VBoxNetDhcpd Dhcpd;
785	int rc = Dhcpd.main(argc, argv);
786
787	return RT_SUCCESS(rc) ? RTEXITCODE_SUCCESS : RTEXITCODE_FAILURE;
788	}
789
790
791	#ifndef VBOX_WITH_HARDENING
792
793	int main(int argc, char **argv)
794	{
795	int rc = RTR3InitExe(argc, &argv, RTR3INIT_FLAGS_SUPLIB);
796	if (RT_FAILURE(rc))
797	return RTMsgInitFailure(rc);
798
799	return TrustedMain(argc, argv);
800	}
801
802
803	# ifdef RT_OS_WINDOWS
804	/** (We don't want a console usually.) */
805	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
806	{
807	RT_NOREF(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
808
809	return main(__argc, __argv);
810	}
811	# endif /* RT_OS_WINDOWS */
812
813	#endif /* !VBOX_WITH_HARDENING */

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source: vbox/trunk/src/VBox/NetworkServices/Dhcpd/VBoxNetDhcpd.cpp@ 82968

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