VBoxNetDhcpd.cpp@ 95851

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1	/* $Id: VBoxNetDhcpd.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* VBoxNetDhcpd - DHCP server for host-only and NAT networks.
4	*/
5
6	/*
7	* Copyright (C) 2009-2022 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 <iprt/sanitized/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 ifProcessInput();
142	int ifFlush();
143
144	int ifClose();
145
146	void ifPump();
147	int ifInput(void *pvSegFrame, uint32_t cbSegFrame);
148
149
150	/*
151	* lwIP callbacks
152	*/
153	static DECLCALLBACK(void) lwipInitCB(void *pvArg);
154	void lwipInit();
155
156	static err_t netifInitCB(netif *pNetif) RT_NOTHROW_PROTO;
157	err_t netifInit(netif *pNetif);
158
159	static err_t netifLinkOutputCB(netif pNetif, pbuf pPBuf) RT_NOTHROW_PROTO;
160	err_t netifLinkOutput(pbuf *pPBuf);
161
162	static void dhcp4RecvCB(void arg, struct udp_pcb pcb, struct pbuf *p,
163	ip_addr_t *addr, u16_t port) RT_NOTHROW_PROTO;
164	void dhcp4Recv(struct udp_pcb pcb, struct pbuf p, ip_addr_t *addr, u16_t port);
165	};
166
167
168	VBoxNetDhcpd::VBoxNetDhcpd()
169	: m_pStderrReleaseLogger(NULL),
170	m_pSession(NIL_RTR0PTR),
171	m_hIf(INTNET_HANDLE_INVALID),
172	m_pIfBuf(NULL),
173	m_LwipNetif(),
174	m_Config(NULL),
175	m_Dhcp4Pcb(NULL)
176	{
177	int rc;
178
179	logInitStderr();
180
181	rc = r3Init();
182	if (RT_FAILURE(rc))
183	return;
184
185	vmmInit();
186	}
187
188
189	VBoxNetDhcpd::~VBoxNetDhcpd()
190	{
191	ifClose();
192	r3Fini();
193	}
194
195
196	/*
197	* We don't know the name of the release log file until we parse our
198	* configuration because we use network name as basename. To get
199	* early logging to work, start with stderr-only release logger.
200	*
201	* We disable "sup" for this logger to avoid spam from SUPR3Init().
202	*/
203	int VBoxNetDhcpd::logInitStderr()
204	{
205	static const char * const s_apszGroups[] = VBOX_LOGGROUP_NAMES;
206
207	PRTLOGGER pLogger;
208	int rc;
209
210	uint32_t fFlags = 0;
211	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
212	fFlags \|= RTLOGFLAGS_USECRLF;
213	#endif
214
215	rc = RTLogCreate(&pLogger, fFlags,
216	"all -sup all.restrict -default.restrict",
217	NULL, /* environment base */
218	RT_ELEMENTS(s_apszGroups), s_apszGroups,
219	RTLOGDEST_STDERR, NULL);
220	if (RT_FAILURE(rc))
221	{
222	RTPrintf("Failed to init stderr logger: %Rrs\n", rc);
223	return rc;
224	}
225
226	m_pStderrReleaseLogger = pLogger;
227	RTLogRelSetDefaultInstance(m_pStderrReleaseLogger);
228
229	return VINF_SUCCESS;
230	}
231
232
233	int VBoxNetDhcpd::r3Init()
234	{
235	AssertReturn(m_pSession == NIL_RTR0PTR, VERR_GENERAL_FAILURE);
236
237	int rc = SUPR3Init(&m_pSession);
238	return rc;
239	}
240
241
242	void VBoxNetDhcpd::r3Fini()
243	{
244	if (m_pSession == NIL_RTR0PTR)
245	return;
246
247	SUPR3Term();
248	m_pSession = NIL_RTR0PTR;
249	}
250
251
252	int VBoxNetDhcpd::vmmInit()
253	{
254	char szPathVMMR0[RTPATH_MAX];
255	int rc = RTPathExecDir(szPathVMMR0, sizeof(szPathVMMR0));
256	if (RT_SUCCESS(rc))
257	rc = RTPathAppend(szPathVMMR0, sizeof(szPathVMMR0), "VMMR0.r0");
258	if (RT_SUCCESS(rc))
259	rc = SUPR3LoadVMM(szPathVMMR0, NULL /pErrInfo/);
260	return rc;
261	}
262
263
264	int VBoxNetDhcpd::ifInit(const RTCString &strNetwork,
265	const RTCString &strTrunk,
266	INTNETTRUNKTYPE enmTrunkType)
267	{
268	int rc;
269
270	rc = ifOpen(strNetwork, strTrunk, enmTrunkType);
271	if (RT_FAILURE(rc))
272	return rc;
273
274	rc = ifGetBuf();
275	if (RT_FAILURE(rc))
276	return rc;
277
278	rc = ifActivate();
279	if (RT_FAILURE(rc))
280	return rc;
281
282	return VINF_SUCCESS;
283	}
284
285
286	int VBoxNetDhcpd::ifOpen(const RTCString &strNetwork,
287	const RTCString &strTrunk,
288	INTNETTRUNKTYPE enmTrunkType)
289	{
290	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
291	AssertReturn(m_hIf == INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
292
293	INTNETOPENREQ OpenReq;
294	RT_ZERO(OpenReq);
295
296	OpenReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
297	OpenReq.Hdr.cbReq = sizeof(OpenReq);
298	OpenReq.pSession = m_pSession;
299
300	int rc = RTStrCopy(OpenReq.szNetwork, sizeof(OpenReq.szNetwork), strNetwork.c_str());
301	AssertRCReturn(rc, rc);
302
303	rc = RTStrCopy(OpenReq.szTrunk, sizeof(OpenReq.szTrunk), strTrunk.c_str());
304	AssertRCReturn(rc, rc);
305
306	if (enmTrunkType != kIntNetTrunkType_Invalid)
307	OpenReq.enmTrunkType = enmTrunkType;
308	else
309	OpenReq.enmTrunkType = kIntNetTrunkType_WhateverNone;
310
311	OpenReq.fFlags = 0;
312	OpenReq.cbSend = _128K;
313	OpenReq.cbRecv = _256K;
314
315	OpenReq.hIf = INTNET_HANDLE_INVALID;
316
317	rc = CALL_VMMR0(VMMR0_DO_INTNET_OPEN, OpenReq);
318	if (RT_FAILURE(rc))
319	return rc;
320
321	m_hIf = OpenReq.hIf;
322	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
323
324	return VINF_SUCCESS;
325	}
326
327
328	int VBoxNetDhcpd::ifGetBuf()
329	{
330	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
331	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
332	AssertReturn(m_pIfBuf == NULL, VERR_GENERAL_FAILURE);
333
334	INTNETIFGETBUFFERPTRSREQ GetBufferPtrsReq;
335	int rc;
336
337	GetBufferPtrsReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
338	GetBufferPtrsReq.Hdr.cbReq = sizeof(GetBufferPtrsReq);
339	GetBufferPtrsReq.pSession = m_pSession;
340	GetBufferPtrsReq.hIf = m_hIf;
341
342	GetBufferPtrsReq.pRing0Buf = NIL_RTR0PTR;
343	GetBufferPtrsReq.pRing3Buf = NULL;
344
345	rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_GET_BUFFER_PTRS, GetBufferPtrsReq);
346	if (RT_FAILURE(rc))
347	return rc;
348
349	m_pIfBuf = GetBufferPtrsReq.pRing3Buf;
350	AssertReturn(m_pIfBuf != NULL, VERR_GENERAL_FAILURE);
351
352	return VINF_SUCCESS;
353	}
354
355
356	int VBoxNetDhcpd::ifActivate()
357	{
358	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
359	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
360	AssertReturn(m_pIfBuf != NULL, VERR_GENERAL_FAILURE);
361
362	INTNETIFSETACTIVEREQ ActiveReq;
363	int rc;
364
365	ActiveReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
366	ActiveReq.Hdr.cbReq = sizeof(ActiveReq);
367	ActiveReq.pSession = m_pSession;
368	ActiveReq.hIf = m_hIf;
369
370	ActiveReq.fActive = 1;
371
372	rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_SET_ACTIVE, ActiveReq);
373	return rc;
374	}
375
376
377	/**
378	* Process incoming packages forever.
379	*
380	* @note This function normally never returns, given that the process is
381	* typically just killed when shutting down a network.
382	*/
383	void VBoxNetDhcpd::ifPump()
384	{
385	for (;;)
386	{
387	/*
388	* Wait for input:
389	*/
390	INTNETIFWAITREQ WaitReq;
391	WaitReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
392	WaitReq.Hdr.cbReq = sizeof(WaitReq);
393	WaitReq.pSession = m_pSession;
394	WaitReq.hIf = m_hIf;
395	WaitReq.cMillies = RT_INDEFINITE_WAIT;
396	int rc = CALL_VMMR0(VMMR0_DO_INTNET_IF_WAIT, WaitReq);
397
398	/*
399	* Process any pending input before we wait again:
400	*/
401	if ( RT_SUCCESS(rc)
402	\|\| rc == VERR_INTERRUPTED
403	\|\| rc == VERR_TIMEOUT /* paranoia */)
404	ifProcessInput();
405	else
406	{
407	DHCP_LOG_MSG_ERROR(("ifWait failed: %Rrc\n", rc));
408	return;
409	}
410	}
411	}
412
413
414	int VBoxNetDhcpd::ifProcessInput()
415	{
416	AssertReturn(m_pSession != NIL_RTR0PTR, VERR_GENERAL_FAILURE);
417	AssertReturn(m_hIf != INTNET_HANDLE_INVALID, VERR_GENERAL_FAILURE);
418	AssertReturn(m_pIfBuf != NULL, VERR_GENERAL_FAILURE);
419
420	PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&m_pIfBuf->Recv);
421	while (pHdr)
422	{
423	const uint8_t u8Type = pHdr->u8Type;
424	void *pvSegFrame;
425	uint32_t cbSegFrame;
426
427	if (u8Type == INTNETHDR_TYPE_FRAME)
428	{
429	pvSegFrame = IntNetHdrGetFramePtr(pHdr, m_pIfBuf);
430	cbSegFrame = pHdr->cbFrame;
431
432	ifInput(pvSegFrame, cbSegFrame);
433	}
434	else if (u8Type == INTNETHDR_TYPE_GSO)
435	{
436	size_t cbGso = pHdr->cbFrame;
437	size_t cbFrame = cbGso - sizeof(PDMNETWORKGSO);
438
439	PCPDMNETWORKGSO pGso = IntNetHdrGetGsoContext(pHdr, m_pIfBuf);
440	if (PDMNetGsoIsValid(pGso, cbGso, cbFrame))
441	{
442	const uint32_t cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
443	for (uint32_t i = 0; i < cSegs; ++i)
444	{
445	uint8_t abHdrScratch[256];
446	pvSegFrame = PDMNetGsoCarveSegmentQD(pGso, (uint8_t *)(pGso + 1), cbFrame,
447	abHdrScratch,
448	i, cSegs,
449	&cbSegFrame);
450	ifInput(pvSegFrame, (uint32_t)cbFrame);
451	}
452	}
453	}
454
455	/* Advance: */
456	IntNetRingSkipFrame(&m_pIfBuf->Recv);
457	pHdr = IntNetRingGetNextFrameToRead(&m_pIfBuf->Recv);
458	}
459
460	return VINF_SUCCESS;
461	}
462
463
464	/**
465	* Got a frame from the internal network, feed it to the lwIP stack.
466	*/
467	int VBoxNetDhcpd::ifInput(void *pvFrame, uint32_t cbFrame)
468	{
469	if (pvFrame == NULL)
470	return VERR_INVALID_PARAMETER;
471
472	if ( cbFrame <= sizeof(RTNETETHERHDR)
473	\|\| cbFrame > UINT16_MAX - ETH_PAD_SIZE)
474	return VERR_INVALID_PARAMETER;
475
476	struct pbuf *p = pbuf_alloc(PBUF_RAW, (u16_t)cbFrame + ETH_PAD_SIZE, PBUF_POOL);
477	if (RT_UNLIKELY(p == NULL))
478	return VERR_NO_MEMORY;
479
480	/*
481	* The code below is inlined version of:
482	*
483	* pbuf_header(p, -ETH_PAD_SIZE); // hide padding
484	* pbuf_take(p, pvFrame, cbFrame);
485	* pbuf_header(p, ETH_PAD_SIZE); // reveal padding
486	*/
487	struct pbuf *q = p;
488	uint8_t pbChunk = (uint8_t )pvFrame;
489	do
490	{
491	uint8_t payload = (uint8_t )q->payload;
492	size_t len = q->len;
493
494	#if ETH_PAD_SIZE
495	if (RT_LIKELY(q == p)) /* single pbuf is large enough */
496	{
497	payload += ETH_PAD_SIZE;
498	len -= ETH_PAD_SIZE;
499	}
500	#endif
501	memcpy(payload, pbChunk, len);
502	pbChunk += len;
503	q = q->next;
504	} while (RT_UNLIKELY(q != NULL));
505
506	m_LwipNetif.input(p, &m_LwipNetif);
507	return VINF_SUCCESS;
508	}
509
510
511	/**
512	* Got a frame from the lwIP stack, feed it to the internal network.
513	*/
514	err_t VBoxNetDhcpd::netifLinkOutput(pbuf *pPBuf)
515	{
516	if (pPBuf->tot_len < sizeof(struct eth_hdr)) /* includes ETH_PAD_SIZE */
517	return ERR_ARG;
518
519	PINTNETHDR pHdr;
520	void *pvFrame;
521	u16_t cbFrame = pPBuf->tot_len - ETH_PAD_SIZE;
522	int rc = IntNetRingAllocateFrame(&m_pIfBuf->Send, cbFrame, &pHdr, &pvFrame);
523	if (RT_FAILURE(rc))
524	return ERR_MEM;
525
526	pbuf_copy_partial(pPBuf, pvFrame, cbFrame, ETH_PAD_SIZE);
527	IntNetRingCommitFrameEx(&m_pIfBuf->Send, pHdr, cbFrame);
528
529	ifFlush();
530	return ERR_OK;
531	}
532
533
534	int VBoxNetDhcpd::ifFlush()
535	{
536	INTNETIFSENDREQ SendReq;
537
538	SendReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
539	SendReq.Hdr.cbReq = sizeof(SendReq);
540	SendReq.pSession = m_pSession;
541
542	SendReq.hIf = m_hIf;
543
544	return CALL_VMMR0(VMMR0_DO_INTNET_IF_SEND, SendReq);
545	}
546
547
548	int VBoxNetDhcpd::ifClose()
549	{
550	if (m_hIf == INTNET_HANDLE_INVALID)
551	return VINF_SUCCESS;
552
553	INTNETIFCLOSEREQ CloseReq;
554
555	CloseReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
556	CloseReq.Hdr.cbReq = sizeof(CloseReq);
557	CloseReq.pSession = m_pSession;
558
559	CloseReq.hIf = m_hIf;
560
561	m_hIf = INTNET_HANDLE_INVALID;
562	m_pIfBuf = NULL;
563
564	CALL_VMMR0(VMMR0_DO_INTNET_IF_CLOSE, CloseReq);
565	return VINF_SUCCESS;
566	}
567
568
569	/* static / DECLCALLBACK(void) VBoxNetDhcpd::lwipInitCB(void pvArg)
570	{
571	AssertPtrReturnVoid(pvArg);
572
573	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(pvArg);
574	self->lwipInit();
575	}
576
577
578	/* static / err_t VBoxNetDhcpd::netifInitCB(netif pNetif) RT_NOTHROW_DEF
579	{
580	AssertPtrReturn(pNetif, ERR_ARG);
581
582	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(pNetif->state);
583	return self->netifInit(pNetif);
584	}
585
586
587	/* static / err_t VBoxNetDhcpd::netifLinkOutputCB(netif pNetif, pbuf *pPBuf) RT_NOTHROW_DEF
588	{
589	AssertPtrReturn(pNetif, ERR_ARG);
590	AssertPtrReturn(pPBuf, ERR_ARG);
591
592	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(pNetif->state);
593	AssertPtrReturn(self, ERR_IF);
594
595	return self->netifLinkOutput(pPBuf);
596	}
597
598
599	/* static / void VBoxNetDhcpd::dhcp4RecvCB(void arg, struct udp_pcb *pcb,
600	struct pbuf *p,
601	ip_addr_t *addr, u16_t port) RT_NOTHROW_DEF
602	{
603	AssertPtrReturnVoid(arg);
604
605	VBoxNetDhcpd self = static_cast<VBoxNetDhcpd >(arg);
606	self->dhcp4Recv(pcb, p, addr, port);
607	pbuf_free(p);
608	}
609
610
611
612
613
614	int VBoxNetDhcpd::main(int argc, char **argv)
615	{
616	/*
617	* Register string format types.
618	*/
619	ClientId::registerFormat();
620	Binding::registerFormat();
621
622	/*
623	* Parse the command line into a configuration object.
624	*/
625	m_Config = Config::create(argc, argv);
626	if (m_Config == NULL)
627	return VERR_GENERAL_FAILURE;
628
629	/*
630	* Initialize the server.
631	*/
632	int rc = m_server.init(m_Config);
633	if (RT_SUCCESS(rc))
634	{
635	/* connect to the intnet */
636	rc = ifInit(m_Config->getNetwork(), m_Config->getTrunk(), m_Config->getTrunkType());
637	if (RT_SUCCESS(rc))
638	{
639	/* setup lwip */
640	rc = vboxLwipCoreInitialize(lwipInitCB, this);
641	if (RT_SUCCESS(rc))
642	{
643	/*
644	* Pump packets more or less for ever.
645	*/
646	ifPump();
647	}
648	else
649	DHCP_LOG_MSG_ERROR(("Terminating - vboxLwipCoreInitialize failed: %Rrc\n", rc));
650	}
651	else
652	DHCP_LOG_MSG_ERROR(("Terminating - ifInit failed: %Rrc\n", rc));
653	}
654	else
655	DHCP_LOG_MSG_ERROR(("Terminating - Dhcpd::init failed: %Rrc\n", rc));
656	return rc;
657	}
658
659
660	void VBoxNetDhcpd::lwipInit()
661	{
662	err_t error;
663
664	ip_addr_t addr, mask;
665	ip4_addr_set_u32(&addr, m_Config->getIPv4Address().u);
666	ip4_addr_set_u32(&mask, m_Config->getIPv4Netmask().u);
667
668	netif *pNetif = netif_add(&m_LwipNetif,
669	&addr, &mask,
670	IP_ADDR_ANY, /* gateway */
671	this, /* state */
672	VBoxNetDhcpd::netifInitCB, /* netif_init_fn */
673	tcpip_input); /* netif_input_fn */
674	if (pNetif == NULL)
675	return;
676
677	netif_set_up(pNetif);
678	netif_set_link_up(pNetif);
679
680	m_Dhcp4Pcb = udp_new();
681	if (RT_UNLIKELY(m_Dhcp4Pcb == NULL))
682	return; /* XXX? */
683
684	ip_set_option(m_Dhcp4Pcb, SOF_BROADCAST);
685	udp_recv(m_Dhcp4Pcb, dhcp4RecvCB, this);
686
687	error = udp_bind(m_Dhcp4Pcb, IP_ADDR_ANY, RTNETIPV4_PORT_BOOTPS);
688	if (error != ERR_OK)
689	{
690	udp_remove(m_Dhcp4Pcb);
691	m_Dhcp4Pcb = NULL;
692	return; /* XXX? */
693	}
694	}
695
696
697	err_t VBoxNetDhcpd::netifInit(netif *pNetif)
698	{
699	pNetif->hwaddr_len = sizeof(RTMAC);
700	memcpy(pNetif->hwaddr, &m_Config->getMacAddress(), sizeof(RTMAC));
701
702	pNetif->mtu = 1500;
703
704	pNetif->flags = NETIF_FLAG_BROADCAST
705	\| NETIF_FLAG_ETHARP
706	\| NETIF_FLAG_ETHERNET;
707
708	pNetif->linkoutput = netifLinkOutputCB;
709	pNetif->output = etharp_output;
710
711	netif_set_default(pNetif);
712	return ERR_OK;
713	}
714
715
716	void VBoxNetDhcpd::dhcp4Recv(struct udp_pcb pcb, struct pbuf p,
717	ip_addr_t *addr, u16_t port)
718	{
719	RT_NOREF(pcb, addr, port);
720
721	if (RT_UNLIKELY(p->next != NULL))
722	return; /* XXX: we want it in one chunk */
723
724	bool broadcasted = ip_addr_cmp(ip_current_dest_addr(), &ip_addr_broadcast)
725	\|\| ip_addr_cmp(ip_current_dest_addr(), &ip_addr_any);
726
727	try
728	{
729	DhcpClientMessage *msgIn = DhcpClientMessage::parse(broadcasted, p->payload, p->len);
730	if (msgIn == NULL)
731	return;
732
733	std::unique_ptr<DhcpClientMessage> autoFreeMsgIn(msgIn);
734
735	DhcpServerMessage msgOut = m_server.process(msgIn);
736	if (msgOut == NULL)
737	return;
738
739	std::unique_ptr<DhcpServerMessage> autoFreeMsgOut(msgOut);
740
741	ip_addr_t dst = { msgOut->dst().u };
742	if (ip_addr_cmp(&dst, &ip_addr_any))
743	ip_addr_copy(dst, ip_addr_broadcast);
744
745	octets_t data;
746	int rc = msgOut->encode(data);
747	if (RT_FAILURE(rc))
748	return;
749
750	unique_ptr_pbuf q ( pbuf_alloc(PBUF_RAW, (u16_t)data.size(), PBUF_RAM) );
751	if (!q)
752	return;
753
754	err_t error = pbuf_take(q.get(), &data.front(), (u16_t)data.size());
755	if (error != ERR_OK)
756	return;
757
758	error = udp_sendto(pcb, q.get(), &dst, RTNETIPV4_PORT_BOOTPC);
759	if (error != ERR_OK)
760	return;
761	}
762	catch (std::bad_alloc &)
763	{
764	LogRel(("VBoxNetDhcpd::dhcp4Recv: Caught std::bad_alloc!\n"));
765	}
766	}
767
768
769
770
771	/*
772	* Entry point.
773	*/
774	extern "C" DECLEXPORT(int) TrustedMain(int argc, char **argv)
775	{
776	VBoxNetDhcpd Dhcpd;
777	int rc = Dhcpd.main(argc, argv);
778	return RT_SUCCESS(rc) ? RTEXITCODE_SUCCESS : RTEXITCODE_FAILURE;
779	}
780
781
782	#ifndef VBOX_WITH_HARDENING
783
784	int main(int argc, char **argv)
785	{
786	int rc = RTR3InitExe(argc, &argv, RTR3INIT_FLAGS_SUPLIB);
787	if (RT_SUCCESS(rc))
788	return TrustedMain(argc, argv);
789	return RTMsgInitFailure(rc);
790	}
791
792
793	# ifdef RT_OS_WINDOWS
794	/** (We don't want a console usually.) */
795	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
796	{
797	RT_NOREF(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
798
799	return main(__argc, __argv);
800	}
801	# endif /* RT_OS_WINDOWS */
802
803	#endif /* !VBOX_WITH_HARDENING */

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source: vbox/trunk/src/VBox/NetworkServices/Dhcpd/VBoxNetDhcpd.cpp@ 95851

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