VBoxNetDHCP.cpp@ 26517

Last change on this file since 26517 was 26517, checked in by vboxsync, 15 years ago
*: RTGetOpt cleanup related to --help and --version (now standard option). Use RTGetOptPrintError.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 66.0 KB

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1	/* $Id: VBoxNetDHCP.cpp 26517 2010-02-14 21:39:00Z vboxsync $ */
2	/** @file
3	* VBoxNetDHCP - DHCP Service for connecting to IntNet.
4	*/
5
6	/*
7	* Copyright (C) 2009 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	/** @page pg_net_dhcp VBoxNetDHCP
23	*
24	* Write a few words...
25	*
26	*/
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#include <iprt/alloca.h>
32	#include <iprt/buildconfig.h>
33	#include <iprt/err.h>
34	#include <iprt/net.h> /* must come before getopt */
35	#include <iprt/getopt.h>
36	#include <iprt/initterm.h>
37	#include <iprt/param.h>
38	#include <iprt/path.h>
39	#include <iprt/stream.h>
40	#include <iprt/time.h>
41	#include <iprt/string.h>
42
43	#include <VBox/sup.h>
44	#include <VBox/intnet.h>
45	#include <VBox/vmm.h>
46
47	#include "../NetLib/VBoxNetLib.h"
48
49	#include <vector>
50	#include <string>
51
52	#ifdef RT_OS_WINDOWS /* WinMain */
53	# include <Windows.h>
54	# include <stdlib.h>
55	#endif
56
57
58	/*******************************************************************************
59	* Structures and Typedefs *
60	*******************************************************************************/
61
62	/**
63	* DHCP configuration item.
64	*
65	* This is all public data because I'm too lazy to do it propertly right now.
66	*/
67	class VBoxNetDhcpCfg
68	{
69	public:
70	/** The etheret addresses this matches config applies to.
71	* An empty vector means 'ANY'. */
72	std::vector<RTMAC> m_MacAddresses;
73	/** The upper address in the range. */
74	RTNETADDRIPV4 m_UpperAddr;
75	/** The lower address in the range. */
76	RTNETADDRIPV4 m_LowerAddr;
77
78	/** Option 1: The net mask. */
79	RTNETADDRIPV4 m_SubnetMask;
80	/* * Option 2: The time offset. */
81	/** Option 3: Routers for the subnet. */
82	std::vector<RTNETADDRIPV4> m_Routers;
83	/* * Option 4: Time server. */
84	/* * Option 5: Name server. */
85	/** Option 6: Domain Name Server (DNS) */
86	std::vector<RTNETADDRIPV4> m_DNSes;
87	/* * Option 7: Log server. */
88	/* * Option 8: Cookie server. */
89	/* * Option 9: LPR server. */
90	/* * Option 10: Impress server. */
91	/* * Option 11: Resource location server. */
92	/* * Option 12: Host name. */
93	std::string m_HostName;
94	/* * Option 13: Boot file size option. */
95	/* * Option 14: Merit dump file. */
96	/** Option 15: Domain name. */
97	std::string m_DomainName;
98	/* * Option 16: Swap server. */
99	/* * Option 17: Root path. */
100	/* * Option 18: Extension path. */
101	/* * Option 19: IP forwarding enable/disable. */
102	/* * Option 20: Non-local routing enable/disable. */
103	/* * Option 21: Policy filter. */
104	/* * Option 22: Maximum datagram reassembly size (MRS). */
105	/* * Option 23: Default IP time-to-live. */
106	/* * Option 24: Path MTU aging timeout. */
107	/* * Option 25: Path MTU plateau table. */
108	/* * Option 26: Interface MTU. */
109	/* * Option 27: All subnets are local. */
110	/* * Option 28: Broadcast address. */
111	/* * Option 29: Perform maximum discovery. */
112	/* * Option 30: Mask supplier. */
113	/* * Option 31: Perform route discovery. */
114	/* * Option 32: Router solicitation address. */
115	/* * Option 33: Static route. */
116	/* * Option 34: Trailer encapsulation. */
117	/* * Option 35: ARP cache timeout. */
118	/* * Option 36: Ethernet encapsulation. */
119	/* * Option 37: TCP Default TTL. */
120	/* * Option 38: TCP Keepalive Interval. */
121	/* * Option 39: TCP Keepalive Garbage. */
122	/* * Option 40: Network Information Service (NIS) Domain. */
123	/* * Option 41: Network Information Servers. */
124	/* * Option 42: Network Time Protocol Servers. */
125	/* * Option 43: Vendor Specific Information. */
126	/* * Option 44: NetBIOS over TCP/IP Name Server (NBNS). */
127	/* * Option 45: NetBIOS over TCP/IP Datagram distribution Server (NBDD). */
128	/* * Option 46: NetBIOS over TCP/IP Node Type. */
129	/* * Option 47: NetBIOS over TCP/IP Scope. */
130	/* * Option 48: X Window System Font Server. */
131	/* * Option 49: X Window System Display Manager. */
132
133	/** Option 51: IP Address Lease Time. */
134	uint32_t m_cSecLease;
135
136	/* * Option 64: Network Information Service+ Domain. */
137	/* * Option 65: Network Information Service+ Servers. */
138	/** Option 66: TFTP server name. */
139	std::string m_TftpServer;
140	/** Address for the bp_siaddr field corresponding to m_TftpServer. */
141	RTNETADDRIPV4 m_TftpServerAddr;
142	/** Option 67: Bootfile name. */
143	std::string m_BootfileName;
144
145	/* * Option 68: Mobile IP Home Agent. */
146	/* * Option 69: Simple Mail Transport Protocol (SMPT) Server. */
147	/* * Option 70: Post Office Protocol (POP3) Server. */
148	/* * Option 71: Network News Transport Protocol (NNTP) Server. */
149	/* * Option 72: Default World Wide Web (WWW) Server. */
150	/* * Option 73: Default Finger Server. */
151	/* * Option 74: Default Internet Relay Chat (IRC) Server. */
152	/* * Option 75: StreetTalk Server. */
153
154	/* * Option 119: Domain Search. */
155
156
157	VBoxNetDhcpCfg()
158	{
159	m_UpperAddr.u = UINT32_MAX;
160	m_LowerAddr.u = UINT32_MAX;
161	m_SubnetMask.u = UINT32_MAX;
162	m_cSecLease = 6060; / 1 hour */
163	}
164
165	/** Validates the configuration.
166	* @returns 0 on success, exit code + error message to stderr on failure. */
167	int validate(void)
168	{
169	if ( m_UpperAddr.u == UINT32_MAX
170	\|\| m_LowerAddr.u == UINT32_MAX
171	\|\| m_SubnetMask.u == UINT32_MAX)
172	{
173	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: Config is missing:");
174	if (m_UpperAddr.u == UINT32_MAX)
175	RTStrmPrintf(g_pStdErr, " --upper-ip");
176	if (m_LowerAddr.u == UINT32_MAX)
177	RTStrmPrintf(g_pStdErr, " --lower-ip");
178	if (m_SubnetMask.u == UINT32_MAX)
179	RTStrmPrintf(g_pStdErr, " --netmask");
180	return 2;
181	}
182
183	if (RT_N2H_U32(m_UpperAddr.u) < RT_N2H_U32(m_LowerAddr.u))
184	{
185	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: The --upper-ip value is lower than the --lower-ip one!\n"
186	" %d.%d.%d.%d < %d.%d.%d.%d\n",
187	m_UpperAddr.au8[0], m_UpperAddr.au8[1], m_UpperAddr.au8[2], m_UpperAddr.au8[3],
188	m_LowerAddr.au8[0], m_LowerAddr.au8[1], m_LowerAddr.au8[2], m_LowerAddr.au8[3]);
189	return 3;
190	}
191
192	/* the code goes insane if we have too many atm. lazy bird */
193	uint32_t cIPs = RT_N2H_U32(m_UpperAddr.u) - RT_N2H_U32(m_LowerAddr.u);
194	if (cIPs > 1024)
195	{
196	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: Too many IPs between --upper-ip and --lower-ip! %d (max 1024)\n"
197	" %d.%d.%d.%d < %d.%d.%d.%d\n",
198	cIPs,
199	m_UpperAddr.au8[0], m_UpperAddr.au8[1], m_UpperAddr.au8[2], m_UpperAddr.au8[3],
200	m_LowerAddr.au8[0], m_LowerAddr.au8[1], m_LowerAddr.au8[2], m_LowerAddr.au8[3]);
201	return 3;
202	}
203	return 0;
204	}
205
206	/**
207	* Is this config for one specific client?
208	*
209	* @return true / false.
210	*/
211	bool isOneSpecificClient(void) const
212	{
213	return m_LowerAddr.u == m_UpperAddr.u
214	&& m_MacAddresses.size() > 0;
215	}
216
217	/**
218	* Checks if this config matches the specified MAC address.
219	*
220	* @returns true / false.
221	*
222	* @param pMac The MAC address to match.
223	*/
224	bool matchesMacAddress(PCRTMAC pMac) const
225	{
226	size_t i = m_MacAddresses.size();
227	if (RT_LIKELY(i < 1))
228	return true; /* no entries == ALL wildcard match */
229
230	while (i--)
231	{
232	PCRTMAC pCur = &m_MacAddresses[i];
233	if ( pCur->au16[0] == pMac->au16[0]
234	&& pCur->au16[1] == pMac->au16[1]
235	&& pCur->au16[2] == pMac->au16[2])
236	return true;
237	}
238	return false;
239	}
240
241	};
242
243	/**
244	* DHCP lease.
245	*/
246	class VBoxNetDhcpLease
247	{
248	public:
249	typedef enum State
250	{
251	/** Invalid. */
252	kState_Invalid = 0,
253	/** The lease is free / released. */
254	kState_Free,
255	/** An offer has been made.
256	* Expire time indicates when the offer expires. */
257	kState_Offer,
258	/** The lease is active.
259	* Expire time indicates when the lease expires. */
260	kState_Active
261	} State;
262
263	/** The client MAC address. */
264	RTMAC m_MacAddress;
265	/** The IPv4 address. */
266	RTNETADDRIPV4 m_IPv4Address;
267
268	/** The current lease state. */
269	State m_enmState;
270	/** The lease expiration time. */
271	RTTIMESPEC m_ExpireTime;
272	/** Transaction ID. */
273	uint32_t m_xid;
274	/** The configuration for this lease. */
275	VBoxNetDhcpCfg *m_pCfg;
276
277	public:
278	/** Constructor taking an IPv4 address and a Config. */
279	VBoxNetDhcpLease(RTNETADDRIPV4 IPv4Addr, VBoxNetDhcpCfg *pCfg)
280	{
281	m_pCfg = pCfg;
282	m_IPv4Address = IPv4Addr;
283
284	m_MacAddress.au16[0] = m_MacAddress.au16[1] = m_MacAddress.au16[2] = 0xff;
285	m_enmState = kState_Free;
286	RTTimeSpecSetSeconds(&m_ExpireTime, 0);
287	m_xid = UINT32_MAX;
288	}
289
290	/** Destructor. */
291	~VBoxNetDhcpLease()
292	{
293	m_IPv4Address.u = UINT32_MAX;
294	m_pCfg = NULL;
295	m_MacAddress.au16[0] = m_MacAddress.au16[1] = m_MacAddress.au16[2] = 0xff;
296	m_enmState = kState_Free;
297	m_xid = UINT32_MAX;
298	}
299
300	void offer(uint32_t xid);
301	void activate(void);
302	void activate(uint32_t xid);
303	void release(void);
304	bool hasExpired(void) const;
305
306	/**
307	* Checks if the lease is in use or not.
308	*
309	* @returns true if active, false if free or expired.
310	*
311	* @param pNow The current time to use. Optional.
312	*/
313	bool isInUse(PCRTTIMESPEC pNow = NULL) const
314	{
315	if ( m_enmState == kState_Offer
316	\|\| m_enmState == kState_Active)
317	{
318	RTTIMESPEC Now;
319	if (!pNow)
320	pNow = RTTimeNow(&Now);
321	return RTTimeSpecGetSeconds(&m_ExpireTime) > RTTimeSpecGetSeconds(pNow);
322	}
323	return false;
324	}
325
326	/**
327	* Is this lease for one specific client?
328	*
329	* @return true/false.
330	*/
331	bool isOneSpecificClient(void) const
332	{
333	return m_pCfg
334	&& m_pCfg->isOneSpecificClient();
335	}
336
337	/**
338	* Is this lease currently being offered to a client.
339	*
340	* @returns true / false.
341	*/
342	bool isBeingOffered(void) const
343	{
344	return m_enmState == kState_Offer
345	&& isInUse();
346	}
347
348	/**
349	* Is the lease in the current config or not.
350	*
351	* When updating the config we might leave active leases behind which aren't
352	* included in the new config. These will have m_pCfg set to NULL and should be
353	* freed up when they expired.
354	*
355	* @returns true / false.
356	*/
357	bool isInCurrentConfig(void) const
358	{
359	return m_pCfg != NULL;
360	}
361	};
362
363	/**
364	* DHCP server instance.
365	*/
366	class VBoxNetDhcp
367	{
368	public:
369	VBoxNetDhcp();
370	virtual ~VBoxNetDhcp();
371
372	int parseArgs(int argc, char **argv);
373	int tryGoOnline(void);
374	int run(void);
375
376	protected:
377	int addConfig(VBoxNetDhcpCfg *pCfg);
378	void explodeConfig(void);
379
380	bool handleDhcpMsg(uint8_t uMsgType, PCRTNETBOOTP pDhcpMsg, size_t cb);
381	bool handleDhcpReqDiscover(PCRTNETBOOTP pDhcpMsg, size_t cb);
382	bool handleDhcpReqRequest(PCRTNETBOOTP pDhcpMsg, size_t cb);
383	bool handleDhcpReqDecline(PCRTNETBOOTP pDhcpMsg, size_t cb);
384	bool handleDhcpReqRelease(PCRTNETBOOTP pDhcpMsg, size_t cb);
385	void makeDhcpReply(uint8_t uMsgType, VBoxNetDhcpLease *pLease, PCRTNETBOOTP pDhcpMsg, size_t cb);
386
387	VBoxNetDhcpLease *findLeaseByMacAddress(PCRTMAC pMacAddress, bool fAnyState);
388	VBoxNetDhcpLease *findLeaseByIpv4AndMacAddresses(RTNETADDRIPV4 IPv4Addr, PCRTMAC pMacAddress, bool fAnyState);
389	VBoxNetDhcpLease *newLease(PCRTNETBOOTP pDhcpMsg, size_t cb);
390
391	static uint8_t const findOption(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, size_t pcbMaxOpt);
392	static bool findOptionIPv4Addr(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, PRTNETADDRIPV4 pIPv4Addr);
393
394	inline void debugPrint( int32_t iMinLevel, bool fMsg, const char *pszFmt, ...) const;
395	void debugPrintV(int32_t iMinLevel, bool fMsg, const char *pszFmt, va_list va) const;
396	static const char *debugDhcpName(uint8_t uMsgType);
397
398	protected:
399	/** @name The server configuration data members.
400	* @{ */
401	std::string m_Name;
402	std::string m_Network;
403	std::string m_TrunkName;
404	INTNETTRUNKTYPE m_enmTrunkType;
405	RTMAC m_MacAddress;
406	RTNETADDRIPV4 m_Ipv4Address;
407	std::string m_LeaseDBName;
408	/** @} */
409
410	/** The current configs. */
411	std::vector<VBoxNetDhcpCfg *> m_Cfgs;
412
413	/** The current leases. */
414	std::vector<VBoxNetDhcpLease> m_Leases;
415
416	/** @name The network interface
417	* @{ */
418	PSUPDRVSESSION m_pSession;
419	uint32_t m_cbSendBuf;
420	uint32_t m_cbRecvBuf;
421	INTNETIFHANDLE m_hIf; /*< The handle to the network interface. /
422	PINTNETBUF m_pIfBuf; /*< Interface buffer. /
423	/** @} */
424
425	/** @name Debug stuff
426	* @{ */
427	int32_t m_cVerbosity;
428	uint8_t m_uCurMsgType;
429	size_t m_cbCurMsg;
430	PCRTNETBOOTP m_pCurMsg;
431	VBOXNETUDPHDRS m_CurHdrs;
432	/** @} */
433	};
434
435
436	/*******************************************************************************
437	* Global Variables *
438	*******************************************************************************/
439	/** Pointer to the DHCP server. */
440	static VBoxNetDhcp *g_pDhcp;
441
442
443	/**
444	* Offer this lease to a client.
445	*
446	* @param xid The transaction ID.
447	*/
448	void VBoxNetDhcpLease::offer(uint32_t xid)
449	{
450	m_enmState = kState_Offer;
451	m_xid = xid;
452	RTTimeNow(&m_ExpireTime);
453	RTTimeSpecAddSeconds(&m_ExpireTime, 60);
454	}
455
456
457	/**
458	* Activate this lease (i.e. a client is now using it).
459	*/
460	void VBoxNetDhcpLease::activate(void)
461	{
462	m_enmState = kState_Active;
463	RTTimeNow(&m_ExpireTime);
464	RTTimeSpecAddSeconds(&m_ExpireTime, m_pCfg ? m_pCfg->m_cSecLease : 60); /* m_pCfg can be NULL right now... */
465	}
466
467
468	/**
469	* Activate this lease with a new transaction ID.
470	*
471	* @param xid The transaction ID.
472	* @todo check if this is really necessary.
473	*/
474	void VBoxNetDhcpLease::activate(uint32_t xid)
475	{
476	activate();
477	m_xid = xid;
478	}
479
480
481	/**
482	* Release a lease either upon client request or because it didn't quite match a
483	* DHCP_REQUEST.
484	*/
485	void VBoxNetDhcpLease::release(void)
486	{
487	m_enmState = kState_Free;
488	RTTimeNow(&m_ExpireTime);
489	RTTimeSpecAddSeconds(&m_ExpireTime, 5);
490	}
491
492
493	/**
494	* Checks if the lease has expired or not.
495	*
496	* This just checks the expiration time not the state. This is so that this
497	* method will work for reusing RELEASEd leases when the client comes back after
498	* a reboot or ipconfig /renew. Callers not interested in info on released
499	* leases should check the state first.
500	*
501	* @returns true if expired, false if not.
502	*/
503	bool VBoxNetDhcpLease::hasExpired() const
504	{
505	RTTIMESPEC Now;
506	return RTTimeSpecGetSeconds(&m_ExpireTime) > RTTimeSpecGetSeconds(RTTimeNow(&Now));
507	}
508
509
510
511
512	/**
513	* Construct a DHCP server with a default configuration.
514	*/
515	VBoxNetDhcp::VBoxNetDhcp()
516	{
517	m_Name = "VBoxNetDhcp";
518	m_Network = "VBoxNetDhcp";
519	m_TrunkName = "";
520	m_enmTrunkType = kIntNetTrunkType_WhateverNone;
521	m_MacAddress.au8[0] = 0x08;
522	m_MacAddress.au8[1] = 0x00;
523	m_MacAddress.au8[2] = 0x27;
524	m_MacAddress.au8[3] = 0x40;
525	m_MacAddress.au8[4] = 0x41;
526	m_MacAddress.au8[5] = 0x42;
527	m_Ipv4Address.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2, 5)));
528
529	m_pSession = NIL_RTR0PTR;
530	m_cbSendBuf = 8192;
531	m_cbRecvBuf = 51200; /** @todo tune to 64 KB with help from SrvIntR0 */
532	m_hIf = INTNET_HANDLE_INVALID;
533	m_pIfBuf = NULL;
534
535	m_cVerbosity = 0;
536	m_uCurMsgType = UINT8_MAX;
537	m_cbCurMsg = 0;
538	m_pCurMsg = NULL;
539	memset(&m_CurHdrs, '\0', sizeof(m_CurHdrs));
540
541	#if 0 /* enable to hack the code without a mile long argument list. */
542	VBoxNetDhcpCfg *pDefCfg = new VBoxNetDhcpCfg();
543	pDefCfg->m_LowerAddr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2,100)));
544	pDefCfg->m_UpperAddr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2,250)));
545	pDefCfg->m_SubnetMask.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8(255,255,255, 0)));
546	RTNETADDRIPV4 Addr;
547	Addr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2, 1)));
548	pDefCfg->m_Routers.push_back(Addr);
549	Addr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2, 2)));
550	pDefCfg->m_DNSes.push_back(Addr);
551	pDefCfg->m_DomainName = "vboxnetdhcp.org";
552	#if 0
553	pDefCfg->m_cSecLease = 6060; / 1 hour */
554	#else
555	pDefCfg->m_cSecLease = 30; /* sec */
556	#endif
557	pDefCfg->m_TftpServer = "10.0.2.3"; //??
558	this->addConfig(pDefCfg);
559	#endif
560	}
561
562
563	/**
564	* Destruct a DHCP server.
565	*/
566	VBoxNetDhcp::~VBoxNetDhcp()
567	{
568	/*
569	* Close the interface connection.
570	*/
571	if (m_hIf != INTNET_HANDLE_INVALID)
572	{
573	INTNETIFCLOSEREQ CloseReq;
574	CloseReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
575	CloseReq.Hdr.cbReq = sizeof(CloseReq);
576	CloseReq.pSession = m_pSession;
577	CloseReq.hIf = m_hIf;
578	m_hIf = INTNET_HANDLE_INVALID;
579	int rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_CLOSE, 0, &CloseReq.Hdr);
580	AssertRC(rc);
581	}
582
583	if (m_pSession)
584	{
585	SUPR3Term(false /fForced/);
586	m_pSession = NIL_RTR0PTR;
587	}
588	}
589
590
591	/**
592	* Adds a config to the tail.
593	*
594	* @returns See VBoxNetDHCP::validate().
595	* @param pCfg The config too add.
596	* This object will be consumed by this call!
597	*/
598	int VBoxNetDhcp::addConfig(VBoxNetDhcpCfg *pCfg)
599	{
600	int rc = 0;
601	if (pCfg)
602	{
603	rc = pCfg->validate();
604	if (!rc)
605	m_Cfgs.push_back(pCfg);
606	else
607	delete pCfg;
608	}
609	return rc;
610	}
611
612
613	/**
614	* Explodes the config into leases.
615	*
616	* @remarks This code is brute force and not very fast nor memory efficient.
617	* We will have to revisit this later.
618	*
619	* @remarks If an IP has been reconfigured for a fixed mac address and it's
620	* already leased to a client, we it won't be available until the
621	* client releases its lease or it expires.
622	*/
623	void VBoxNetDhcp::explodeConfig(void)
624	{
625	RTTIMESPEC Now;
626	RTTimeNow(&Now);
627
628	/*
629	* Remove all non-active leases from the vector and zapping the
630	* config pointers of the once left behind.
631	*/
632	std::vector<VBoxNetDhcpLease>::iterator Itr = m_Leases.begin();
633	while (Itr != m_Leases.end())
634	{
635	if (!Itr->isInUse(&Now))
636	Itr = m_Leases.erase(Itr);
637	else
638	{
639	Itr->m_pCfg = NULL;
640	Itr++;
641	}
642	}
643
644	/*
645	* Loop thru the configurations in reverse order, giving the last
646	* configs priority of the newer ones.
647	*/
648	size_t iCfg = m_Cfgs.size();
649	while (iCfg-- > 0)
650	{
651	VBoxNetDhcpCfg *pCfg = m_Cfgs[iCfg];
652
653	/* Expand the IP lease range. */
654	uint32_t const uLast = RT_N2H_U32(pCfg->m_UpperAddr.u);
655	for (uint32_t i = RT_N2H_U32(pCfg->m_LowerAddr.u); i <= uLast; i++)
656	{
657	RTNETADDRIPV4 IPv4Addr;
658	IPv4Addr.u = RT_H2N_U32(i);
659
660	/* Check if it exists and is configured. */
661	VBoxNetDhcpLease *pLease = NULL;
662	for (size_t j = 0; j < m_Leases.size(); j++)
663	if (m_Leases[j].m_IPv4Address.u == IPv4Addr.u)
664	{
665	pLease = &m_Leases[j];
666	break;
667	}
668	if (pLease)
669	{
670	if (!pLease->m_pCfg)
671	pLease->m_pCfg = pCfg;
672	}
673	else
674	{
675	/* add it. */
676	VBoxNetDhcpLease NewLease(IPv4Addr, pCfg);
677	m_Leases.push_back(NewLease);
678	debugPrint(10, false, "exploseConfig: new lease %d.%d.%d.%d",
679	IPv4Addr.au8[0], IPv4Addr.au8[1], IPv4Addr.au8[2], IPv4Addr.au8[3]);
680	}
681	}
682	}
683	}
684
685
686	/**
687	* Parse the arguments.
688	*
689	* @returns 0 on success, fully bitched exit code on failure.
690	*
691	* @param argc Argument count.
692	* @param argv Argument vector.
693	*/
694	int VBoxNetDhcp::parseArgs(int argc, char **argv)
695	{
696	static const RTGETOPTDEF s_aOptionDefs[] =
697	{
698	{ "--name", 'N', RTGETOPT_REQ_STRING },
699	{ "--network", 'n', RTGETOPT_REQ_STRING },
700	{ "--trunk-name", 't', RTGETOPT_REQ_STRING },
701	{ "--trunk-type", 'T', RTGETOPT_REQ_STRING },
702	{ "--mac-address", 'a', RTGETOPT_REQ_MACADDR },
703	{ "--ip-address", 'i', RTGETOPT_REQ_IPV4ADDR },
704	{ "--lease-db", 'D', RTGETOPT_REQ_STRING },
705	{ "--verbose", 'v', RTGETOPT_REQ_NOTHING },
706
707	{ "--begin-config", 'b', RTGETOPT_REQ_NOTHING },
708	{ "--gateway", 'g', RTGETOPT_REQ_IPV4ADDR },
709	{ "--lower-ip", 'l', RTGETOPT_REQ_IPV4ADDR },
710	{ "--upper-ip", 'u', RTGETOPT_REQ_IPV4ADDR },
711	{ "--netmask", 'm', RTGETOPT_REQ_IPV4ADDR },
712	};
713
714	RTGETOPTSTATE State;
715	int rc = RTGetOptInit(&State, argc, argv, &s_aOptionDefs[0], RT_ELEMENTS(s_aOptionDefs), 0, 0 /fFlags/);
716	AssertRCReturn(rc, 49);
717
718	VBoxNetDhcpCfg *pCurCfg = NULL;
719	for (;;)
720	{
721	RTGETOPTUNION Val;
722	rc = RTGetOpt(&State, &Val);
723	if (!rc)
724	break;
725	switch (rc)
726	{
727	case 'N':
728	m_Name = Val.psz;
729	break;
730	case 'n':
731	m_Network = Val.psz;
732	break;
733	case 't':
734	m_TrunkName = Val.psz;
735	break;
736	case 'T':
737	if (!strcmp(Val.psz, "none"))
738	m_enmTrunkType = kIntNetTrunkType_None;
739	else if (!strcmp(Val.psz, "whatever"))
740	m_enmTrunkType = kIntNetTrunkType_WhateverNone;
741	else if (!strcmp(Val.psz, "netflt"))
742	m_enmTrunkType = kIntNetTrunkType_NetFlt;
743	else if (!strcmp(Val.psz, "netadp"))
744	m_enmTrunkType = kIntNetTrunkType_NetAdp;
745	else if (!strcmp(Val.psz, "srvnat"))
746	m_enmTrunkType = kIntNetTrunkType_SrvNat;
747	else
748	{
749	RTStrmPrintf(g_pStdErr, "Invalid trunk type '%s'\n", Val.psz);
750	return 1;
751	}
752	break;
753	case 'a':
754	m_MacAddress = Val.MacAddr;
755	break;
756	case 'i':
757	m_Ipv4Address = Val.IPv4Addr;
758	break;
759	case 'd':
760	m_LeaseDBName = Val.psz;
761	break;
762
763	case 'v':
764	m_cVerbosity++;
765	break;
766
767	/* Begin config. */
768	case 'b':
769	rc = addConfig(pCurCfg);
770	if (rc)
771	break;
772	pCurCfg = NULL;
773	/* fall thru */
774
775	/* config specific ones. */
776	case 'g':
777	case 'l':
778	case 'u':
779	case 'm':
780	if (!pCurCfg)
781	{
782	pCurCfg = new VBoxNetDhcpCfg();
783	if (!pCurCfg)
784	{
785	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: new VBoxDhcpCfg failed\n");
786	return 1;
787	}
788	}
789
790	switch (rc)
791	{
792	case 'g':
793	pCurCfg->m_Routers.push_back(Val.IPv4Addr);
794	break;
795
796	case 'l':
797	pCurCfg->m_LowerAddr = Val.IPv4Addr;
798	break;
799
800	case 'u':
801	pCurCfg->m_UpperAddr = Val.IPv4Addr;
802	break;
803
804	case 'm':
805	pCurCfg->m_SubnetMask = Val.IPv4Addr;
806	break;
807
808	case 0: /* ignore */ break;
809	default:
810	AssertMsgFailed(("%d", rc));
811	return 1;
812	}
813	break;
814
815	case 'V':
816	RTPrintf("%sr%u\n", RTBldCfgVersion(), RTBldCfgRevision());
817	return 0;
818
819	case 'h':
820	RTPrintf("VBoxNetDHCP Version %s\n"
821	"(C) 2009 Sun Microsystems, Inc.\n"
822	"All rights reserved\n"
823	"\n"
824	"Usage: VBoxNetDHCP <options>\n"
825	"\n"
826	"Options:\n",
827	RTBldCfgVersion());
828	for (size_t i = 0; i < RT_ELEMENTS(s_aOptionDefs); i++)
829	RTPrintf(" -%c, %s\n", s_aOptionDefs[i].iShort, s_aOptionDefs[i].pszLong);
830	return 1;
831
832	default:
833	rc = RTGetOptPrintError(rc, &Val);
834	RTPrintf("Use --help for more information.\n");
835	return rc;
836	}
837	}
838
839	/*
840	* Do the reconfig. (move this later)
841	*/
842	if (!rc)
843	explodeConfig();
844
845	return rc;
846	}
847
848
849	/**
850	* Tries to connect to the internal network.
851	*
852	* @returns 0 on success, exit code + error message to stderr on failure.
853	*/
854	int VBoxNetDhcp::tryGoOnline(void)
855	{
856	/*
857	* Open the session, load ring-0 and issue the request.
858	*/
859	int rc = SUPR3Init(&m_pSession);
860	if (RT_FAILURE(rc))
861	{
862	m_pSession = NIL_RTR0PTR;
863	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3Init -> %Rrc", rc);
864	return 1;
865	}
866
867	char szPath[RTPATH_MAX];
868	rc = RTPathExecDir(szPath, sizeof(szPath) - sizeof("/VMMR0.r0"));
869	if (RT_FAILURE(rc))
870	{
871	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: RTPathProgram -> %Rrc", rc);
872	return 1;
873	}
874
875	rc = SUPR3LoadVMM(strcat(szPath, "/VMMR0.r0"));
876	if (RT_FAILURE(rc))
877	{
878	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3LoadVMM(\"%s\") -> %Rrc", szPath, rc);
879	return 1;
880	}
881
882	/*
883	* Create the open request.
884	*/
885	INTNETOPENREQ OpenReq;
886	OpenReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
887	OpenReq.Hdr.cbReq = sizeof(OpenReq);
888	OpenReq.pSession = m_pSession;
889	strncpy(OpenReq.szNetwork, m_Network.c_str(), sizeof(OpenReq.szNetwork));
890	OpenReq.szNetwork[sizeof(OpenReq.szNetwork) - 1] = '\0';
891	strncpy(OpenReq.szTrunk, m_TrunkName.c_str(), sizeof(OpenReq.szTrunk));
892	OpenReq.szTrunk[sizeof(OpenReq.szTrunk) - 1] = '\0';
893	OpenReq.enmTrunkType = m_enmTrunkType;
894	OpenReq.fFlags = 0; /** @todo check this */
895	OpenReq.cbSend = m_cbSendBuf;
896	OpenReq.cbRecv = m_cbRecvBuf;
897	OpenReq.hIf = INTNET_HANDLE_INVALID;
898
899	/*
900	* Issue the request.
901	*/
902	debugPrint(2, false, "attempting to open/create network \"%s\"...", OpenReq.szNetwork);
903	rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_OPEN, 0, &OpenReq.Hdr);
904	if (RT_SUCCESS(rc))
905	{
906	m_hIf = OpenReq.hIf;
907	debugPrint(1, false, "successfully opened/created \"%s\" - hIf=%#x", OpenReq.szNetwork, m_hIf);
908
909	/*
910	* Get the ring-3 address of the shared interface buffer.
911	*/
912	INTNETIFGETRING3BUFFERREQ GetRing3BufferReq;
913	GetRing3BufferReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
914	GetRing3BufferReq.Hdr.cbReq = sizeof(GetRing3BufferReq);
915	GetRing3BufferReq.pSession = m_pSession;
916	GetRing3BufferReq.hIf = m_hIf;
917	GetRing3BufferReq.pRing3Buf = NULL;
918	rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_GET_RING3_BUFFER, 0, &GetRing3BufferReq.Hdr);
919	if (RT_SUCCESS(rc))
920	{
921	PINTNETBUF pBuf = GetRing3BufferReq.pRing3Buf;
922	debugPrint(1, false, "pBuf=%p cbBuf=%d cbSend=%d cbRecv=%d",
923	pBuf, pBuf->cbBuf, pBuf->cbSend, pBuf->cbRecv);
924	m_pIfBuf = pBuf;
925
926	/*
927	* Activate the interface.
928	*/
929	INTNETIFSETACTIVEREQ ActiveReq;
930	ActiveReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
931	ActiveReq.Hdr.cbReq = sizeof(ActiveReq);
932	ActiveReq.pSession = m_pSession;
933	ActiveReq.hIf = m_hIf;
934	ActiveReq.fActive = true;
935	rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_SET_ACTIVE, 0, &ActiveReq.Hdr);
936	if (RT_SUCCESS(rc))
937	return 0;
938
939	/* bail out */
940	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3CallVMMR0Ex(,VMMR0_DO_INTNET_IF_SET_PROMISCUOUS_MODE,) failed, rc=%Rrc\n", rc);
941	}
942	else
943	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3CallVMMR0Ex(,VMMR0_DO_INTNET_IF_GET_RING3_BUFFER,) failed, rc=%Rrc\n", rc);
944	}
945	else
946	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3CallVMMR0Ex(,VMMR0_DO_INTNET_OPEN,) failed, rc=%Rrc\n", rc);
947
948	return RT_SUCCESS(rc) ? 0 : 1;
949	}
950
951
952	/**
953	* Runs the DHCP server.
954	*
955	* @returns exit code + error message to stderr on failure, won't return on
956	* success (you must kill this process).
957	*/
958	int VBoxNetDhcp::run(void)
959	{
960	/*
961	* The loop.
962	*/
963	PINTNETRINGBUF pRingBuf = &m_pIfBuf->Recv;
964	for (;;)
965	{
966	/*
967	* Wait for a packet to become available.
968	*/
969	INTNETIFWAITREQ WaitReq;
970	WaitReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
971	WaitReq.Hdr.cbReq = sizeof(WaitReq);
972	WaitReq.pSession = m_pSession;
973	WaitReq.hIf = m_hIf;
974	WaitReq.cMillies = 2000; /* 2 secs - the sleep is for some reason uninterruptible... / /* @todo fix interruptability in SrvIntNet! */
975	int rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_WAIT, 0, &WaitReq.Hdr);
976	if (RT_FAILURE(rc))
977	{
978	if (rc == VERR_TIMEOUT)
979	continue;
980	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: VMMR0_DO_INTNET_IF_WAIT returned %Rrc\n", rc);
981	return 1;
982	}
983
984	/*
985	* Process the receive buffer.
986	*/
987	while (INTNETRingGetReadable(pRingBuf) > 0)
988	{
989	size_t cb;
990	void *pv = VBoxNetUDPMatch(m_pIfBuf, RTNETIPV4_PORT_BOOTPS, &m_MacAddress,
991	VBOXNETUDP_MATCH_UNICAST \| VBOXNETUDP_MATCH_BROADCAST \| VBOXNETUDP_MATCH_CHECKSUM
992	\| (m_cVerbosity > 2 ? VBOXNETUDP_MATCH_PRINT_STDERR : 0),
993	&m_CurHdrs, &cb);
994	if (pv && cb)
995	{
996	PCRTNETBOOTP pDhcpMsg = (PCRTNETBOOTP)pv;
997	m_pCurMsg = pDhcpMsg;
998	m_cbCurMsg = cb;
999
1000	uint8_t uMsgType;
1001	if (RTNetIPv4IsDHCPValid(NULL /* why is this here? */, pDhcpMsg, cb, &uMsgType))
1002	{
1003	m_uCurMsgType = uMsgType;
1004	handleDhcpMsg(uMsgType, pDhcpMsg, cb);
1005	m_uCurMsgType = UINT8_MAX;
1006	}
1007	else
1008	debugPrint(1, true, "VBoxNetDHCP: Skipping invalid DHCP packet.\n"); /** @todo handle pure bootp clients too? */
1009
1010	m_pCurMsg = NULL;
1011	m_cbCurMsg = 0;
1012	}
1013	else if (VBoxNetArpHandleIt(m_pSession, m_hIf, m_pIfBuf, &m_MacAddress, m_Ipv4Address))
1014	{
1015	/* nothing */
1016	}
1017
1018	/* Advance to the next frame. */
1019	INTNETRingSkipFrame(m_pIfBuf, pRingBuf);
1020	}
1021	}
1022
1023	return 0;
1024	}
1025
1026
1027	/**
1028	* Handles a DHCP message.
1029	*
1030	* @returns true if handled, false if not.
1031	* @param uMsgType The message type.
1032	* @param pDhcpMsg The DHCP message.
1033	* @param cb The size of the DHCP message.
1034	*/
1035	bool VBoxNetDhcp::handleDhcpMsg(uint8_t uMsgType, PCRTNETBOOTP pDhcpMsg, size_t cb)
1036	{
1037	if (pDhcpMsg->bp_op == RTNETBOOTP_OP_REQUEST)
1038	{
1039	switch (uMsgType)
1040	{
1041	case RTNET_DHCP_MT_DISCOVER:
1042	return handleDhcpReqDiscover(pDhcpMsg, cb);
1043
1044	case RTNET_DHCP_MT_REQUEST:
1045	return handleDhcpReqRequest(pDhcpMsg, cb);
1046
1047	case RTNET_DHCP_MT_DECLINE:
1048	return handleDhcpReqDecline(pDhcpMsg, cb);
1049
1050	case RTNET_DHCP_MT_RELEASE:
1051	return handleDhcpReqRelease(pDhcpMsg, cb);
1052
1053	case RTNET_DHCP_MT_INFORM:
1054	debugPrint(0, true, "Should we handle this?");
1055	break;
1056
1057	default:
1058	debugPrint(0, true, "Unexpected.");
1059	break;
1060	}
1061	}
1062	return false;
1063	}
1064
1065
1066	/**
1067	* The client is requesting an offer.
1068	*
1069	* @returns true.
1070	*
1071	* @param pDhcpMsg The message.
1072	* @param cb The message size.
1073	*/
1074	bool VBoxNetDhcp::handleDhcpReqDiscover(PCRTNETBOOTP pDhcpMsg, size_t cb)
1075	{
1076	/*
1077	* The newLease() method contains logic for finding current leases
1078	* and reusing them in case the client is forgetful.
1079	*/
1080	VBoxNetDhcpLease *pLease = newLease(pDhcpMsg, cb);
1081	if (!pLease)
1082	return false;
1083	debugPrint(1, true, "Offering %d.%d.%d.%d to %.6Rhxs xid=%#x",
1084	pLease->m_IPv4Address.au8[0],
1085	pLease->m_IPv4Address.au8[1],
1086	pLease->m_IPv4Address.au8[2],
1087	pLease->m_IPv4Address.au8[3],
1088	&pDhcpMsg->bp_chaddr.Mac,
1089	pDhcpMsg->bp_xid);
1090	pLease->offer(pDhcpMsg->bp_xid);
1091
1092	makeDhcpReply(RTNET_DHCP_MT_OFFER, pLease, pDhcpMsg, cb);
1093	return true;
1094	}
1095
1096
1097	/**
1098	* The client is requesting an offer.
1099	*
1100	* @returns true.
1101	*
1102	* @param pDhcpMsg The message.
1103	* @param cb The message size.
1104	*/
1105	bool VBoxNetDhcp::handleDhcpReqRequest(PCRTNETBOOTP pDhcpMsg, size_t cb)
1106	{
1107	/** @todo Probably need to match the server IP here to work correctly with
1108	* other servers. */
1109	/** @todo This code isn't entirely correct and quite a bit of a hack, but it
1110	* will have to do for now as the right thing (tm) is very complex.
1111	* Part of the fun is verifying that the request is something we can
1112	* and should handle. */
1113
1114	/*
1115	* Try find the lease by the requested address + client MAC address.
1116	*/
1117	VBoxNetDhcpLease *pLease = NULL;
1118	RTNETADDRIPV4 IPv4Addr;
1119	bool fReqAddr = findOptionIPv4Addr(RTNET_DHCP_OPT_REQ_ADDR, pDhcpMsg, cb, &IPv4Addr);
1120	if (fReqAddr)
1121	{
1122	fReqAddr = true;
1123	pLease = findLeaseByIpv4AndMacAddresses(IPv4Addr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1124	}
1125
1126	/*
1127	* Try find the lease by the client IP address + client MAC address.
1128	*/
1129	if ( !pLease
1130	&& pDhcpMsg->bp_ciaddr.u)
1131	pLease = findLeaseByIpv4AndMacAddresses(pDhcpMsg->bp_ciaddr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1132
1133	#if 0 /** @todo client id stuff - it doesn't make sense here imho, we need IP + MAC. What would make sense
1134	though is to compare the client id with what we've got in the lease and use it to root out
1135	bad requests. */
1136	/*
1137	* Try find the lease by using the client id.
1138	*/
1139	if (!pLease)
1140	{
1141	size_t cbClientID = 0;
1142	uint8_t const *pbClientID = findOption(RTNET_DHCP_OPT_CLIENT_ID, pDhcpMsg, cb, &cbClientID);
1143	if ( pbClientID
1144	&& cbClientID == sizeof(RTMAC) + 1
1145	&& pbClientID[0] == RTNET_ARP_ETHER
1146	&&
1147	)
1148	{
1149	pLease = findLeaseByIpv4AndMacAddresses(pDhcpMsg->bp_ciaddr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1150	}
1151	}
1152	#endif
1153
1154	/*
1155	* Validate the lease that's requested.
1156	* We've already check the MAC and IP addresses.
1157	*/
1158	bool fAckIt = false;
1159	if (pLease)
1160	{
1161	if (pLease->isBeingOffered())
1162	{
1163	if (pLease->m_xid == pDhcpMsg->bp_xid)
1164	debugPrint(2, true, "REQUEST for offered lease.");
1165	else
1166	debugPrint(2, true, "REQUEST for offered lease, xid mismatch. Expected %#x, got %#x.",
1167	pLease->m_xid, pDhcpMsg->bp_xid);
1168	pLease->activate(pDhcpMsg->bp_xid);
1169	fAckIt = true;
1170	}
1171	else if (!pLease->isInCurrentConfig())
1172	debugPrint(1, true, "REQUEST for obsolete lease -> NAK");
1173	else if (fReqAddr != (pDhcpMsg->bp_ciaddr.u != 0)) // ???
1174	{
1175	/** @todo this ain't safe. */
1176	debugPrint(1, true, "REQUEST for lease not on offer, assuming renewal. lease_xid=%#x bp_xid=%#x",
1177	pLease->m_xid, pDhcpMsg->bp_xid);
1178	fAckIt = true;
1179	pLease->activate(pDhcpMsg->bp_xid);
1180	}
1181	else
1182	debugPrint(1, true, "REQUEST for lease not on offer, NAK it.");
1183	}
1184
1185	/*
1186	* NAK if if no lease was found.
1187	*/
1188	if (fAckIt)
1189	{
1190	debugPrint(1, false, "ACK'ing DHCP_REQUEST");
1191	makeDhcpReply(RTNET_DHCP_MT_ACK, pLease, pDhcpMsg, cb);
1192	}
1193	else
1194	{
1195	debugPrint(1, false, "NAK'ing DHCP_REQUEST");
1196	makeDhcpReply(RTNET_DHCP_MT_NAC, NULL, pDhcpMsg, cb);
1197	}
1198
1199	return true;
1200	}
1201
1202
1203	/**
1204	* The client is declining an offer we've made.
1205	*
1206	* @returns true.
1207	*
1208	* @param pDhcpMsg The message.
1209	* @param cb The message size.
1210	*/
1211	bool VBoxNetDhcp::handleDhcpReqDecline(PCRTNETBOOTP pDhcpMsg, size_t cb)
1212	{
1213	/** @todo Probably need to match the server IP here to work correctly with
1214	* other servers. */
1215
1216	/*
1217	* The client is supposed to pass us option 50, requested address,
1218	* from the offer. We also match the lease state. Apparently the
1219	* MAC address is not supposed to be checked here.
1220	*/
1221
1222	/** @todo this is not required in the initial implementation, do it later. */
1223	debugPrint(1, true, "DECLINE is not implemented");
1224	return true;
1225	}
1226
1227
1228	/**
1229	* The client is releasing its lease - good boy.
1230	*
1231	* @returns true.
1232	*
1233	* @param pDhcpMsg The message.
1234	* @param cb The message size.
1235	*/
1236	bool VBoxNetDhcp::handleDhcpReqRelease(PCRTNETBOOTP pDhcpMsg, size_t cb)
1237	{
1238	/** @todo Probably need to match the server IP here to work correctly with
1239	* other servers. */
1240
1241	/*
1242	* The client may pass us option 61, client identifier, which we should
1243	* use to find the lease by.
1244	*
1245	* We're matching MAC address and lease state as well.
1246	*/
1247
1248	/*
1249	* If no client identifier or if we couldn't find a lease by using it,
1250	* we will try look it up by the client IP address.
1251	*/
1252
1253
1254	/*
1255	* If found, release it.
1256	*/
1257
1258
1259	/** @todo this is not required in the initial implementation, do it later. */
1260	debugPrint(1, true, "RELEASE is not implemented");
1261	return true;
1262	}
1263
1264
1265	/**
1266	* Helper class for stuffing DHCP options into a reply packet.
1267	*/
1268	class VBoxNetDhcpWriteCursor
1269	{
1270	private:
1271	uint8_t m_pbCur; /< The current cursor position. /
1272	uint8_t m_pbEnd; /< The end the current option space. /
1273	uint8_t m_pfOverload; /< Pointer to the flags of the overload option. /
1274	uint8_t m_fUsed; /*< Overload fields that have been used. /
1275	PRTNETDHCPOPT m_pOpt; /*< The current option. /
1276	PRTNETBOOTP m_pDhcp; /*< The DHCP packet. /
1277	bool m_fOverflowed; /*< Set if we've overflowed, otherwise false. /
1278
1279	public:
1280	/** Instantiate an option cursor for the specified DHCP message. */
1281	VBoxNetDhcpWriteCursor(PRTNETBOOTP pDhcp, size_t cbDhcp) :
1282	m_pbCur(&pDhcp->bp_vend.Dhcp.dhcp_opts[0]),
1283	m_pbEnd((uint8_t *)pDhcp + cbDhcp),
1284	m_pfOverload(NULL),
1285	m_fUsed(0),
1286	m_pOpt(NULL),
1287	m_pDhcp(pDhcp),
1288	m_fOverflowed(false)
1289	{
1290	AssertPtr(pDhcp);
1291	Assert(cbDhcp > RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts[10]));
1292	}
1293
1294	/** Destructor. */
1295	~VBoxNetDhcpWriteCursor()
1296	{
1297	m_pbCur = m_pbEnd = m_pfOverload = NULL;
1298	m_pOpt = NULL;
1299	m_pDhcp = NULL;
1300	}
1301
1302	/**
1303	* Try use the bp_file field.
1304	* @returns true if not overloaded, false otherwise.
1305	*/
1306	bool useBpFile(void)
1307	{
1308	if ( m_pfOverload
1309	&& (*m_pfOverload & 1))
1310	return false;
1311	m_fUsed \|= 1 /* bp_file flag*/;
1312	return true;
1313	}
1314
1315
1316	/**
1317	* Try overload more BOOTP fields
1318	*/
1319	bool overloadMore(void)
1320	{
1321	/* switch option area. */
1322	uint8_t *pbNew;
1323	uint8_t *pbNewEnd;
1324	uint8_t fField;
1325	if (!(m_fUsed & 1))
1326	{
1327	fField = 1;
1328	pbNew = &m_pDhcp->bp_file[0];
1329	pbNewEnd = &m_pDhcp->bp_file[sizeof(m_pDhcp->bp_file)];
1330	}
1331	else if (!(m_fUsed & 2))
1332	{
1333	fField = 2;
1334	pbNew = &m_pDhcp->bp_sname[0];
1335	pbNewEnd = &m_pDhcp->bp_sname[sizeof(m_pDhcp->bp_sname)];
1336	}
1337	else
1338	return false;
1339
1340	if (!m_pfOverload)
1341	{
1342	/* Add an overload option. */
1343	*m_pbCur++ = RTNET_DHCP_OPT_OPTION_OVERLOAD;
1344	*m_pbCur++ = fField;
1345	m_pfOverload = m_pbCur;
1346	m_pbCur++ = 1; / bp_file flag */
1347	}
1348	else
1349	*m_pfOverload \|= fField;
1350
1351	/* pad current option field */
1352	while (m_pbCur != m_pbEnd)
1353	m_pbCur++ = RTNET_DHCP_OPT_PAD; /* @todo not sure if this stuff is at all correct... */
1354
1355	/* switch */
1356	m_pbCur = pbNew;
1357	m_pbEnd = pbNewEnd;
1358	return true;
1359	}
1360
1361	/**
1362	* Begin an option.
1363	*
1364	* @returns true on succes, false if we're out of space.
1365	*
1366	* @param uOption The option number.
1367	* @param cb The amount of data.
1368	*/
1369	bool begin(uint8_t uOption, size_t cb)
1370	{
1371	/* Check that the data of the previous option has all been written. */
1372	Assert( !m_pOpt
1373	\|\| (m_pbCur - m_pOpt->dhcp_len == (uint8_t *)(m_pOpt + 1)));
1374	AssertMsg(cb <= 255, ("%#x\n", cb));
1375
1376	/* Check if we need to overload more stuff. */
1377	if ((uintptr_t)(m_pbEnd - m_pbCur) < cb + 2 + (m_pfOverload ? 1 : 3))
1378	{
1379	m_pOpt = NULL;
1380	if (!overloadMore())
1381	{
1382	m_fOverflowed = true;
1383	AssertMsgFailedReturn(("%u %#x\n", uOption, cb), false);
1384	}
1385	if ((uintptr_t)(m_pbEnd - m_pbCur) < cb + 2 + 1)
1386	{
1387	m_fOverflowed = true;
1388	AssertMsgFailedReturn(("%u %#x\n", uOption, cb), false);
1389	}
1390	}
1391
1392	/* Emit the option header. */
1393	m_pOpt = (PRTNETDHCPOPT)m_pbCur;
1394	m_pOpt->dhcp_opt = uOption;
1395	m_pOpt->dhcp_len = (uint8_t)cb;
1396	m_pbCur += 2;
1397	return true;
1398	}
1399
1400	/**
1401	* Puts option data.
1402	*
1403	* @param pvData The data.
1404	* @param cb The amount to put.
1405	*/
1406	void put(void const *pvData, size_t cb)
1407	{
1408	Assert(m_pOpt \|\| m_fOverflowed);
1409	if (RT_LIKELY(m_pOpt))
1410	{
1411	Assert((uintptr_t)m_pbCur - (uintptr_t)(m_pOpt + 1) + cb <= (size_t)m_pOpt->dhcp_len);
1412	memcpy(m_pbCur, pvData, cb);
1413	m_pbCur += cb;
1414	}
1415	}
1416
1417	/**
1418	* Puts an IPv4 Address.
1419	*
1420	* @param IPv4Addr The address.
1421	*/
1422	void putIPv4Addr(RTNETADDRIPV4 IPv4Addr)
1423	{
1424	put(&IPv4Addr, 4);
1425	}
1426
1427	/**
1428	* Adds an IPv4 address option.
1429	*
1430	* @returns true/false just like begin().
1431	*
1432	* @param uOption The option number.
1433	* @param IPv4Addr The address.
1434	*/
1435	bool optIPv4Addr(uint8_t uOption, RTNETADDRIPV4 IPv4Addr)
1436	{
1437	if (!begin(uOption, 4))
1438	return false;
1439	putIPv4Addr(IPv4Addr);
1440	return true;
1441	}
1442
1443	/**
1444	* Adds an option taking 1 or more IPv4 address.
1445	*
1446	* If the vector contains no addresses, the option will not be added.
1447	*
1448	* @returns true/false just like begin().
1449	*
1450	* @param uOption The option number.
1451	* @param rIPv4Addrs Reference to the address vector.
1452	*/
1453	bool optIPv4Addrs(uint8_t uOption, std::vector<RTNETADDRIPV4> const &rIPv4Addrs)
1454	{
1455	size_t const c = rIPv4Addrs.size();
1456	if (!c)
1457	return true;
1458
1459	if (!begin(uOption, 4*c))
1460	return false;
1461	for (size_t i = 0; i < c; i++)
1462	putIPv4Addr(rIPv4Addrs[i]);
1463	return true;
1464	}
1465
1466	/**
1467	* Puts an 8-bit integer.
1468	*
1469	* @param u8 The integer.
1470	*/
1471	void putU8(uint8_t u8)
1472	{
1473	put(&u8, 1);
1474	}
1475
1476	/**
1477	* Adds an 8-bit integer option.
1478	*
1479	* @returns true/false just like begin().
1480	*
1481	* @param uOption The option number.
1482	* @param u8 The integer
1483	*/
1484	bool optU8(uint8_t uOption, uint8_t u8)
1485	{
1486	if (!begin(uOption, 1))
1487	return false;
1488	putU8(u8);
1489	return true;
1490	}
1491
1492	/**
1493	* Puts an 32-bit integer (network endian).
1494	*
1495	* @param u32Network The integer.
1496	*/
1497	void putU32(uint32_t u32)
1498	{
1499	put(&u32, 4);
1500	}
1501
1502	/**
1503	* Adds an 32-bit integer (network endian) option.
1504	*
1505	* @returns true/false just like begin().
1506	*
1507	* @param uOption The option number.
1508	* @param u32Network The integer.
1509	*/
1510	bool optU32(uint8_t uOption, uint32_t u32)
1511	{
1512	if (!begin(uOption, 4))
1513	return false;
1514	putU32(u32);
1515	return true;
1516	}
1517
1518	/**
1519	* Puts a std::string.
1520	*
1521	* @param rStr Reference to the string.
1522	*/
1523	void putStr(std::string const &rStr)
1524	{
1525	put(rStr.c_str(), rStr.size());
1526	}
1527
1528	/**
1529	* Adds an std::string option if the string isn't empty.
1530	*
1531	* @returns true/false just like begin().
1532	*
1533	* @param uOption The option number.
1534	* @param rStr Reference to the string.
1535	*/
1536	bool optStr(uint8_t uOption, std::string const &rStr)
1537	{
1538	const size_t cch = rStr.size();
1539	if (!cch)
1540	return true;
1541
1542	if (!begin(uOption, cch))
1543	return false;
1544	put(rStr.c_str(), cch);
1545	return true;
1546	}
1547
1548	/**
1549	* Whether we've overflowed.
1550	*
1551	* @returns true on overflow, false otherwise.
1552	*/
1553	bool hasOverflowed(void) const
1554	{
1555	return m_fOverflowed;
1556	}
1557
1558	/**
1559	* Adds the terminating END option.
1560	*
1561	* The END will always be added as we're reserving room for it, however, we
1562	* might've dropped previous options due to overflows and that is what the
1563	* return status indicates.
1564	*
1565	* @returns true on success, false on a (previous) overflow.
1566	*/
1567	bool optEnd(void)
1568	{
1569	Assert((uintptr_t)(m_pbEnd - m_pbCur) < 4096);
1570	*m_pbCur++ = RTNET_DHCP_OPT_END;
1571	return !hasOverflowed();
1572	}
1573	};
1574
1575
1576	/**
1577	* Constructs and sends a reply to a client.
1578	*
1579	* @returns
1580	* @param uMsgType The DHCP message type.
1581	* @param pLease The lease. This can be NULL for some replies.
1582	* @param pDhcpMsg The client message. We will dig out the MAC address,
1583	* transaction ID, and requested options from this.
1584	* @param cb The size of the client message.
1585	*/
1586	void VBoxNetDhcp::makeDhcpReply(uint8_t uMsgType, VBoxNetDhcpLease *pLease, PCRTNETBOOTP pDhcpMsg, size_t cb)
1587	{
1588	size_t cbReply = RTNET_DHCP_NORMAL_SIZE; /** @todo respect the RTNET_DHCP_OPT_MAX_DHCP_MSG_SIZE option */
1589	PRTNETBOOTP pReply = (PRTNETBOOTP)alloca(cbReply);
1590
1591	/*
1592	* The fixed bits stuff.
1593	*/
1594	pReply->bp_op = RTNETBOOTP_OP_REPLY;
1595	pReply->bp_htype = RTNET_ARP_ETHER;
1596	pReply->bp_hlen = sizeof(RTMAC);
1597	pReply->bp_hops = 0;
1598	pReply->bp_xid = pDhcpMsg->bp_xid;
1599	pReply->bp_secs = 0;
1600	pReply->bp_flags = 0; // (pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST); ??
1601	pReply->bp_ciaddr.u = 0;
1602	pReply->bp_yiaddr.u = pLease ? pLease->m_IPv4Address.u : 0xffffffff;
1603	pReply->bp_siaddr.u = pLease && pLease->m_pCfg ? pLease->m_pCfg->m_TftpServerAddr.u : 0; /* (next server == TFTP)*/
1604	pReply->bp_giaddr.u = 0;
1605	memset(&pReply->bp_chaddr, '\0', sizeof(pReply->bp_chaddr));
1606	pReply->bp_chaddr.Mac = pDhcpMsg->bp_chaddr.Mac;
1607	memset(&pReply->bp_sname[0], '\0', sizeof(pReply->bp_sname));
1608	memset(&pReply->bp_file[0], '\0', sizeof(pReply->bp_file));
1609	pReply->bp_vend.Dhcp.dhcp_cookie = RT_H2N_U32_C(RTNET_DHCP_COOKIE);
1610	memset(&pReply->bp_vend.Dhcp.dhcp_opts[0], '\0', RTNET_DHCP_OPT_SIZE);
1611
1612	/*
1613	* The options - use a cursor class for dealing with the ugly stuff.
1614	*/
1615	VBoxNetDhcpWriteCursor Cursor(pReply, cbReply);
1616
1617	/* The basics */
1618	Cursor.optU8(RTNET_DHCP_OPT_MSG_TYPE, uMsgType);
1619	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SERVER_ID, m_Ipv4Address);
1620
1621	if (uMsgType != RTNET_DHCP_MT_NAC)
1622	{
1623	AssertReturnVoid(pLease && pLease->m_pCfg);
1624	const VBoxNetDhcpCfg pCfg = pLease->m_pCfg; / no need to retain it. */
1625
1626	/* The IP config. */
1627	Cursor.optU32(RTNET_DHCP_OPT_LEASE_TIME, RT_H2N_U32(pCfg->m_cSecLease));
1628	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SUBNET_MASK, pCfg->m_SubnetMask);
1629	Cursor.optIPv4Addrs(RTNET_DHCP_OPT_ROUTERS, pCfg->m_Routers);
1630	Cursor.optIPv4Addrs(RTNET_DHCP_OPT_ROUTERS, pCfg->m_DNSes);
1631	Cursor.optStr(RTNET_DHCP_OPT_HOST_NAME, pCfg->m_HostName);
1632	Cursor.optStr(RTNET_DHCP_OPT_DOMAIN_NAME, pCfg->m_DomainName);
1633
1634	/* The PXE config. */
1635	if (pCfg->m_BootfileName.size())
1636	{
1637	if (Cursor.useBpFile())
1638	RTStrPrintf((char *)&pReply->bp_file[0], sizeof(pReply->bp_file), "%s", pCfg->m_BootfileName.c_str());
1639	else
1640	Cursor.optStr(RTNET_DHCP_OPT_BOOTFILE_NAME, pCfg->m_BootfileName);
1641	}
1642	}
1643
1644	/* Terminate the options. */
1645	if (!Cursor.optEnd())
1646	debugPrint(0, true, "option overflow\n");
1647
1648	/*
1649	* Send it.
1650	*/
1651	int rc;
1652	#if 0
1653	if (!(pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST)) /** @todo need to see someone set this flag to check that it's correct. */
1654	{
1655	RTNETADDRIPV4 IPv4AddrBrdCast;
1656	IPv4AddrBrdCast.u = UINT32_C(0xffffffff); /* broadcast IP */
1657	rc = VBoxNetUDPUnicast(m_pSession, m_hIf, m_pIfBuf,
1658	m_Ipv4Address, &m_MacAddress, RTNETIPV4_PORT_BOOTPS, /* sender */
1659	IPv4AddrBrdCast, &pDhcpMsg->bp_chaddr.Mac, RTNETIPV4_PORT_BOOTPC, /* receiver */
1660	pReply, cbReply);
1661	}
1662	else
1663	#endif
1664	rc = VBoxNetUDPBroadcast(m_pSession, m_hIf, m_pIfBuf,
1665	m_Ipv4Address, &m_MacAddress, RTNETIPV4_PORT_BOOTPS, /* sender */
1666	RTNETIPV4_PORT_BOOTPC, /* receiver port */
1667	pReply, cbReply);
1668	if (RT_FAILURE(rc))
1669	debugPrint(0, true, "error %Rrc when sending the reply", rc);
1670	}
1671
1672
1673	/**
1674	* Look up a lease by MAC address.
1675	*
1676	* @returns Pointer to the lease if found, NULL if not found.
1677	* @param pMacAddress The mac address.
1678	* @param fAnyState Any state.
1679	*/
1680	VBoxNetDhcpLease *VBoxNetDhcp::findLeaseByMacAddress(PCRTMAC pMacAddress, bool fAnyState)
1681	{
1682	size_t iLease = m_Leases.size();
1683	while (iLease-- > 0)
1684	{
1685	VBoxNetDhcpLease *pLease = &m_Leases[iLease];
1686	if ( pLease
1687	&& pLease->m_MacAddress.au16[0] == pMacAddress->au16[0]
1688	&& pLease->m_MacAddress.au16[1] == pMacAddress->au16[1]
1689	&& pLease->m_MacAddress.au16[2] == pMacAddress->au16[2]
1690	&& ( fAnyState
1691	\|\| (pLease->m_enmState != VBoxNetDhcpLease::kState_Free)) )
1692	return pLease;
1693	}
1694
1695	return NULL;
1696	}
1697
1698
1699	/**
1700	* Look up a lease by IPv4 and MAC addresses.
1701	*
1702	* @returns Pointer to the lease if found, NULL if not found.
1703	* @param IPv4Addr The IPv4 address.
1704	* @param pMacAddress The mac address.
1705	* @param fAnyState Any state.
1706	*/
1707	VBoxNetDhcpLease *VBoxNetDhcp::findLeaseByIpv4AndMacAddresses(RTNETADDRIPV4 IPv4Addr, PCRTMAC pMacAddress, bool fAnyState)
1708	{
1709	size_t iLease = m_Leases.size();
1710	while (iLease-- > 0)
1711	{
1712	VBoxNetDhcpLease *pLease = &m_Leases[iLease];
1713	if ( pLease
1714	&& pLease->m_IPv4Address.u == IPv4Addr.u
1715	&& pLease->m_MacAddress.au16[0] == pMacAddress->au16[0]
1716	&& pLease->m_MacAddress.au16[1] == pMacAddress->au16[1]
1717	&& pLease->m_MacAddress.au16[2] == pMacAddress->au16[2]
1718	&& ( fAnyState
1719	\|\| (pLease->m_enmState != VBoxNetDhcpLease::kState_Free)) )
1720	return pLease;
1721	}
1722
1723	return NULL;
1724	}
1725
1726
1727	/**
1728	* Creates a new lease for the client specified in the DHCP message.
1729	*
1730	* The caller has already made sure it doesn't already have a lease.
1731	*
1732	* @returns Pointer to the lease if found, NULL+log if not found.
1733	* @param IPv4Addr The IPv4 address.
1734	* @param pMacAddress The MAC address.
1735	*/
1736	VBoxNetDhcpLease *VBoxNetDhcp::newLease(PCRTNETBOOTP pDhcpMsg, size_t cb)
1737	{
1738	RTMAC const MacAddr = pDhcpMsg->bp_chaddr.Mac;
1739	RTTIMESPEC Now;
1740	RTTimeNow(&Now);
1741
1742	/*
1743	* Search the possible leases.
1744	*
1745	* We'll try do all the searches in one pass, that is to say, perfect
1746	* match, old lease, and next free/expired lease.
1747	*/
1748	VBoxNetDhcpLease *pBest = NULL;
1749	VBoxNetDhcpLease *pOld = NULL;
1750	VBoxNetDhcpLease *pFree = NULL;
1751
1752	size_t cLeases = m_Leases.size();
1753	for (size_t i = 0; i < cLeases; i++)
1754	{
1755	VBoxNetDhcpLease *pCur = &m_Leases[i];
1756
1757	/* Skip it if no configuration, that means its not in the current config. */
1758	if (!pCur->m_pCfg)
1759	continue;
1760
1761	/* best */
1762	if ( pCur->isOneSpecificClient()
1763	&& pCur->m_pCfg->matchesMacAddress(&MacAddr))
1764	{
1765	if ( !pBest
1766	\|\| pBest->m_pCfg->m_MacAddresses.size() < pCur->m_pCfg->m_MacAddresses.size())
1767	pBest = pCur;
1768	}
1769
1770	/* old lease */
1771	if ( pCur->m_MacAddress.au16[0] == MacAddr.au16[0]
1772	&& pCur->m_MacAddress.au16[1] == MacAddr.au16[1]
1773	&& pCur->m_MacAddress.au16[2] == MacAddr.au16[2])
1774	{
1775	if ( !pOld
1776	\|\| RTTimeSpecGetSeconds(&pCur->m_ExpireTime) > RTTimeSpecGetSeconds(&pFree->m_ExpireTime))
1777	pOld = pCur;
1778	}
1779
1780	/* expired lease */
1781	if (!pCur->isInUse(&Now))
1782	{
1783	if ( !pFree
1784	\|\| RTTimeSpecGetSeconds(&pCur->m_ExpireTime) < RTTimeSpecGetSeconds(&pFree->m_ExpireTime))
1785	pFree = pCur;
1786	}
1787	}
1788
1789	VBoxNetDhcpLease *pNew = pBest;
1790	if (!pNew)
1791	pNew = pOld;
1792	if (!pNew)
1793	pNew = pFree;
1794	if (!pNew)
1795	{
1796	debugPrint(0, true, "No more leases.");
1797	return NULL;
1798	}
1799
1800	/*
1801	* Init the lease.
1802	*/
1803	pNew->m_MacAddress = MacAddr;
1804	pNew->m_xid = pDhcpMsg->bp_xid;
1805	/** @todo extract the client id. */
1806
1807	return pNew;
1808	}
1809
1810
1811	/**
1812	* Finds an option.
1813	*
1814	* @returns On success, a pointer to the first byte in the option data (no none
1815	* then it'll be the byte following the 0 size field) and *pcbOpt set
1816	* to the option length.
1817	* On failure, NULL is returned and *pcbOpt unchanged.
1818	*
1819	* @param uOption The option to search for.
1820	* @param pDhcpMsg The DHCP message.
1821	* @param cb The size of the message.
1822	* @param pcbOpt Where to store the option size size. Optional. Note
1823	* that this is adjusted if the option length is larger
1824	* than the message buffer.
1825	*/
1826	/* static / const uint8_t
1827	VBoxNetDhcp::findOption(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, size_t *pcbOpt)
1828	{
1829	Assert(uOption != RTNET_DHCP_OPT_PAD);
1830
1831	/*
1832	* Validate the DHCP bits and figure the max size of the options in the vendor field.
1833	*/
1834	if (cb <= RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts))
1835	return NULL;
1836	if (pDhcpMsg->bp_vend.Dhcp.dhcp_cookie != RT_H2N_U32_C(RTNET_DHCP_COOKIE))
1837	return NULL;
1838	size_t cbLeft = cb - RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts);
1839	if (cbLeft > RTNET_DHCP_OPT_SIZE)
1840	cbLeft = RTNET_DHCP_OPT_SIZE;
1841
1842	/*
1843	* Search the vendor field.
1844	*/
1845	bool fExtended = false;
1846	uint8_t const *pb = &pDhcpMsg->bp_vend.Dhcp.dhcp_opts[0];
1847	while (pb && cbLeft > 0)
1848	{
1849	uint8_t uCur = *pb;
1850	if (uCur == RTNET_DHCP_OPT_PAD)
1851	{
1852	cbLeft--;
1853	pb++;
1854	}
1855	else if (cbLeft <= 1)
1856	break;
1857	else
1858	{
1859	size_t cbCur = pb[1];
1860	if (cbCur > cbLeft - 2)
1861	cbCur = cbLeft - 2;
1862	if (uCur == uOption)
1863	{
1864	if (pcbOpt)
1865	*pcbOpt = cbCur;
1866	return pb+2;
1867	}
1868	pb += cbCur + 2;
1869	cbLeft -= cbCur - 2;
1870	}
1871	}
1872
1873	/** @todo search extended dhcp option field(s) when present */
1874
1875	return NULL;
1876	}
1877
1878
1879	/**
1880	* Locates an option with an IPv4 address in the DHCP message.
1881	*
1882	* @returns true and *pIpv4Addr if found, false if not.
1883	*
1884	* @param uOption The option to find.
1885	* @param pDhcpMsg The DHCP message.
1886	* @param cb The size of the message.
1887	* @param pIPv4Addr Where to put the address.
1888	*/
1889	/* static */ bool
1890	VBoxNetDhcp::findOptionIPv4Addr(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, PRTNETADDRIPV4 pIPv4Addr)
1891	{
1892	size_t cbOpt;
1893	uint8_t const *pbOpt = findOption(uOption, pDhcpMsg, cb, &cbOpt);
1894	if (pbOpt)
1895	{
1896	if (cbOpt >= sizeof(RTNETADDRIPV4))
1897	{
1898	pIPv4Addr = (PCRTNETADDRIPV4)pbOpt;
1899	return true;
1900	}
1901	}
1902	return false;
1903	}
1904
1905
1906	/**
1907	* Print debug message depending on the m_cVerbosity level.
1908	*
1909	* @param iMinLevel The minimum m_cVerbosity level for this message.
1910	* @param fMsg Whether to dump parts for the current DHCP message.
1911	* @param pszFmt The message format string.
1912	* @param ... Optional arguments.
1913	*/
1914	inline void VBoxNetDhcp::debugPrint(int32_t iMinLevel, bool fMsg, const char *pszFmt, ...) const
1915	{
1916	if (iMinLevel <= m_cVerbosity)
1917	{
1918	va_list va;
1919	va_start(va, pszFmt);
1920	debugPrintV(iMinLevel, fMsg, pszFmt, va);
1921	va_end(va);
1922	}
1923	}
1924
1925
1926	/**
1927	* Print debug message depending on the m_cVerbosity level.
1928	*
1929	* @param iMinLevel The minimum m_cVerbosity level for this message.
1930	* @param fMsg Whether to dump parts for the current DHCP message.
1931	* @param pszFmt The message format string.
1932	* @param va Optional arguments.
1933	*/
1934	void VBoxNetDhcp::debugPrintV(int iMinLevel, bool fMsg, const char *pszFmt, va_list va) const
1935	{
1936	if (iMinLevel <= m_cVerbosity)
1937	{
1938	va_list vaCopy; /* This dude is very special, thus the copy. */
1939	va_copy(vaCopy, va);
1940	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: %s: %N\n", iMinLevel >= 2 ? "debug" : "info", pszFmt, &vaCopy);
1941	va_end(vaCopy);
1942
1943	if ( fMsg
1944	&& m_cVerbosity >= 2
1945	&& m_pCurMsg)
1946	{
1947	const char *pszMsg = m_uCurMsgType != UINT8_MAX ? debugDhcpName(m_uCurMsgType) : "";
1948	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: debug: %8s chaddr=%.6Rhxs ciaddr=%d.%d.%d.%d yiaddr=%d.%d.%d.%d siaddr=%d.%d.%d.%d xid=%#x\n",
1949	pszMsg,
1950	&m_pCurMsg->bp_chaddr,
1951	m_pCurMsg->bp_ciaddr.au8[0], m_pCurMsg->bp_ciaddr.au8[1], m_pCurMsg->bp_ciaddr.au8[2], m_pCurMsg->bp_ciaddr.au8[3],
1952	m_pCurMsg->bp_yiaddr.au8[0], m_pCurMsg->bp_yiaddr.au8[1], m_pCurMsg->bp_yiaddr.au8[2], m_pCurMsg->bp_yiaddr.au8[3],
1953	m_pCurMsg->bp_siaddr.au8[0], m_pCurMsg->bp_siaddr.au8[1], m_pCurMsg->bp_siaddr.au8[2], m_pCurMsg->bp_siaddr.au8[3],
1954	m_pCurMsg->bp_xid);
1955	}
1956	}
1957	}
1958
1959
1960	/**
1961	* Gets the name of given DHCP message type.
1962	*
1963	* @returns Readonly name.
1964	* @param uMsgType The message number.
1965	*/
1966	/* static / const char VBoxNetDhcp::debugDhcpName(uint8_t uMsgType)
1967	{
1968	switch (uMsgType)
1969	{
1970	case 0: return "MT_00";
1971	case RTNET_DHCP_MT_DISCOVER: return "DISCOVER";
1972	case RTNET_DHCP_MT_OFFER: return "OFFER";
1973	case RTNET_DHCP_MT_REQUEST: return "REQUEST";
1974	case RTNET_DHCP_MT_DECLINE: return "DECLINE";
1975	case RTNET_DHCP_MT_ACK: return "ACK";
1976	case RTNET_DHCP_MT_NAC: return "NAC";
1977	case RTNET_DHCP_MT_RELEASE: return "RELEASE";
1978	case RTNET_DHCP_MT_INFORM: return "INFORM";
1979	case 9: return "MT_09";
1980	case 10: return "MT_0a";
1981	case 11: return "MT_0b";
1982	case 12: return "MT_0c";
1983	case 13: return "MT_0d";
1984	case 14: return "MT_0e";
1985	case 15: return "MT_0f";
1986	case 16: return "MT_10";
1987	case 17: return "MT_11";
1988	case 18: return "MT_12";
1989	case 19: return "MT_13";
1990	case UINT8_MAX: return "MT_ff";
1991	default: return "UNKNOWN";
1992	}
1993	}
1994
1995
1996
1997	/**
1998	* Entry point.
1999	*/
2000	extern "C" DECLEXPORT(int) TrustedMain(int argc, char argv, char envp)
2001	{
2002	/*
2003	* Instantiate the DHCP server and hand it the options.
2004	*/
2005	VBoxNetDhcp *pDhcp = new VBoxNetDhcp();
2006	if (!pDhcp)
2007	{
2008	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: new VBoxNetDhcp failed!\n");
2009	return 1;
2010	}
2011	int rc = pDhcp->parseArgs(argc - 1, argv + 1);
2012	if (rc)
2013	return rc;
2014
2015	/*
2016	* Try connect the server to the network.
2017	*/
2018	rc = pDhcp->tryGoOnline();
2019	if (rc)
2020	{
2021	delete pDhcp;
2022	return rc;
2023	}
2024
2025	/*
2026	* Process requests.
2027	*/
2028	g_pDhcp = pDhcp;
2029	rc = pDhcp->run();
2030	g_pDhcp = NULL;
2031	delete pDhcp;
2032
2033	return rc;
2034	}
2035
2036
2037	#ifndef VBOX_WITH_HARDENING
2038
2039	int main(int argc, char argv, char envp)
2040	{
2041	int rc = RTR3InitAndSUPLib();
2042	if (RT_FAILURE(rc))
2043	{
2044	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: RTR3InitAndSupLib failed, rc=%Rrc\n", rc);
2045	return 1;
2046	}
2047
2048	return TrustedMain(argc, argv, envp);
2049	}
2050
2051	# ifdef RT_OS_WINDOWS
2052
2053	static LRESULT CALLBACK WindowProc(HWND hwnd,
2054	UINT uMsg,
2055	WPARAM wParam,
2056	LPARAM lParam
2057	)
2058	{
2059	if(uMsg == WM_DESTROY)
2060	{
2061	PostQuitMessage(0);
2062	return 0;
2063	}
2064	return DefWindowProc (hwnd, uMsg, wParam, lParam);
2065	}
2066
2067	static LPCSTR g_WndClassName = "VBoxNetDHCPClass";
2068
2069	static DWORD WINAPI MsgThreadProc(__in LPVOID lpParameter)
2070	{
2071	HWND hwnd = 0;
2072	HINSTANCE hInstance = (HINSTANCE)GetModuleHandle (NULL);
2073	bool bExit = false;
2074
2075	/* Register the Window Class. */
2076	WNDCLASS wc;
2077	wc.style = 0;
2078	wc.lpfnWndProc = WindowProc;
2079	wc.cbClsExtra = 0;
2080	wc.cbWndExtra = sizeof(void *);
2081	wc.hInstance = hInstance;
2082	wc.hIcon = NULL;
2083	wc.hCursor = NULL;
2084	wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
2085	wc.lpszMenuName = NULL;
2086	wc.lpszClassName = g_WndClassName;
2087
2088	ATOM atomWindowClass = RegisterClass(&wc);
2089
2090	if (atomWindowClass != 0)
2091	{
2092	/* Create the window. */
2093	hwnd = CreateWindowEx (WS_EX_TOOLWINDOW \| WS_EX_TRANSPARENT \| WS_EX_TOPMOST,
2094	g_WndClassName, g_WndClassName,
2095	WS_POPUPWINDOW,
2096	-200, -200, 100, 100, NULL, NULL, hInstance, NULL);
2097
2098	if (hwnd)
2099	{
2100	SetWindowPos(hwnd, HWND_TOPMOST, -200, -200, 0, 0,
2101	SWP_NOACTIVATE \| SWP_HIDEWINDOW \| SWP_NOCOPYBITS \| SWP_NOREDRAW \| SWP_NOSIZE);
2102
2103	MSG msg;
2104	while (GetMessage(&msg, NULL, 0, 0))
2105	{
2106	TranslateMessage(&msg);
2107	DispatchMessage(&msg);
2108	}
2109
2110	DestroyWindow (hwnd);
2111
2112	bExit = true;
2113	}
2114
2115	UnregisterClass (g_WndClassName, hInstance);
2116	}
2117
2118	if(bExit)
2119	{
2120	/* no need any accuracy here, in anyway the DHCP server usually gets terminated with TerminateProcess */
2121	exit(0);
2122	}
2123
2124	return 0;
2125	}
2126
2127
2128	/** (We don't want a console usually.) */
2129	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
2130	{
2131	NOREF(hInstance); NOREF(hPrevInstance); NOREF(lpCmdLine); NOREF(nCmdShow);
2132
2133	HANDLE hThread = CreateThread(
2134	NULL, /__in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes, /
2135	0, /__in SIZE_T dwStackSize, /
2136	MsgThreadProc, /__in LPTHREAD_START_ROUTINE lpStartAddress,/
2137	NULL, /__in_opt LPVOID lpParameter,/
2138	0, /__in DWORD dwCreationFlags,/
2139	NULL /__out_opt LPDWORD lpThreadId/
2140	);
2141
2142	if(hThread != NULL)
2143	CloseHandle(hThread);
2144
2145	return main(__argc, __argv, environ);
2146	}
2147	# endif /* RT_OS_WINDOWS */
2148
2149	#endif /* !VBOX_WITH_HARDENING */
2150

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source: vbox/trunk/src/VBox/NetworkServices/DHCP/VBoxNetDHCP.cpp@ 26517

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