VBoxNetDHCP.cpp@ 29132

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1	/* $Id: VBoxNetDHCP.cpp 28845 2010-04-27 16:41:56Z vboxsync $ */
2	/** @file
3	* VBoxNetDHCP - DHCP Service for connecting to IntNet.
4	*/
5
6	/*
7	* Copyright (C) 2009 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	/** @page pg_net_dhcp VBoxNetDHCP
19	*
20	* Write a few words...
21	*
22	*/
23
24	/*******************************************************************************
25	* Header Files *
26	*******************************************************************************/
27	#include <iprt/alloca.h>
28	#include <iprt/buildconfig.h>
29	#include <iprt/err.h>
30	#include <iprt/net.h> /* must come before getopt */
31	#include <iprt/getopt.h>
32	#include <iprt/initterm.h>
33	#include <iprt/param.h>
34	#include <iprt/path.h>
35	#include <iprt/stream.h>
36	#include <iprt/time.h>
37	#include <iprt/string.h>
38
39	#include <VBox/sup.h>
40	#include <VBox/intnet.h>
41	#include <VBox/intnetinline.h>
42	#include <VBox/vmm.h>
43	#include <VBox/version.h>
44
45	#include "../NetLib/VBoxNetLib.h"
46
47	#include <vector>
48	#include <string>
49
50	#ifdef RT_OS_WINDOWS /* WinMain */
51	# include <Windows.h>
52	# include <stdlib.h>
53	#endif
54
55
56	/*******************************************************************************
57	* Structures and Typedefs *
58	*******************************************************************************/
59
60	/**
61	* DHCP configuration item.
62	*
63	* This is all public data because I'm too lazy to do it propertly right now.
64	*/
65	class VBoxNetDhcpCfg
66	{
67	public:
68	/** The etheret addresses this matches config applies to.
69	* An empty vector means 'ANY'. */
70	std::vector<RTMAC> m_MacAddresses;
71	/** The upper address in the range. */
72	RTNETADDRIPV4 m_UpperAddr;
73	/** The lower address in the range. */
74	RTNETADDRIPV4 m_LowerAddr;
75
76	/** Option 1: The net mask. */
77	RTNETADDRIPV4 m_SubnetMask;
78	/* * Option 2: The time offset. */
79	/** Option 3: Routers for the subnet. */
80	std::vector<RTNETADDRIPV4> m_Routers;
81	/* * Option 4: Time server. */
82	/* * Option 5: Name server. */
83	/** Option 6: Domain Name Server (DNS) */
84	std::vector<RTNETADDRIPV4> m_DNSes;
85	/* * Option 7: Log server. */
86	/* * Option 8: Cookie server. */
87	/* * Option 9: LPR server. */
88	/* * Option 10: Impress server. */
89	/* * Option 11: Resource location server. */
90	/* * Option 12: Host name. */
91	std::string m_HostName;
92	/* * Option 13: Boot file size option. */
93	/* * Option 14: Merit dump file. */
94	/** Option 15: Domain name. */
95	std::string m_DomainName;
96	/* * Option 16: Swap server. */
97	/* * Option 17: Root path. */
98	/* * Option 18: Extension path. */
99	/* * Option 19: IP forwarding enable/disable. */
100	/* * Option 20: Non-local routing enable/disable. */
101	/* * Option 21: Policy filter. */
102	/* * Option 22: Maximum datagram reassembly size (MRS). */
103	/* * Option 23: Default IP time-to-live. */
104	/* * Option 24: Path MTU aging timeout. */
105	/* * Option 25: Path MTU plateau table. */
106	/* * Option 26: Interface MTU. */
107	/* * Option 27: All subnets are local. */
108	/* * Option 28: Broadcast address. */
109	/* * Option 29: Perform maximum discovery. */
110	/* * Option 30: Mask supplier. */
111	/* * Option 31: Perform route discovery. */
112	/* * Option 32: Router solicitation address. */
113	/* * Option 33: Static route. */
114	/* * Option 34: Trailer encapsulation. */
115	/* * Option 35: ARP cache timeout. */
116	/* * Option 36: Ethernet encapsulation. */
117	/* * Option 37: TCP Default TTL. */
118	/* * Option 38: TCP Keepalive Interval. */
119	/* * Option 39: TCP Keepalive Garbage. */
120	/* * Option 40: Network Information Service (NIS) Domain. */
121	/* * Option 41: Network Information Servers. */
122	/* * Option 42: Network Time Protocol Servers. */
123	/* * Option 43: Vendor Specific Information. */
124	/* * Option 44: NetBIOS over TCP/IP Name Server (NBNS). */
125	/* * Option 45: NetBIOS over TCP/IP Datagram distribution Server (NBDD). */
126	/* * Option 46: NetBIOS over TCP/IP Node Type. */
127	/* * Option 47: NetBIOS over TCP/IP Scope. */
128	/* * Option 48: X Window System Font Server. */
129	/* * Option 49: X Window System Display Manager. */
130
131	/** Option 51: IP Address Lease Time. */
132	uint32_t m_cSecLease;
133
134	/* * Option 64: Network Information Service+ Domain. */
135	/* * Option 65: Network Information Service+ Servers. */
136	/** Option 66: TFTP server name. */
137	std::string m_TftpServer;
138	/** Address for the bp_siaddr field corresponding to m_TftpServer. */
139	RTNETADDRIPV4 m_TftpServerAddr;
140	/** Option 67: Bootfile name. */
141	std::string m_BootfileName;
142
143	/* * Option 68: Mobile IP Home Agent. */
144	/* * Option 69: Simple Mail Transport Protocol (SMPT) Server. */
145	/* * Option 70: Post Office Protocol (POP3) Server. */
146	/* * Option 71: Network News Transport Protocol (NNTP) Server. */
147	/* * Option 72: Default World Wide Web (WWW) Server. */
148	/* * Option 73: Default Finger Server. */
149	/* * Option 74: Default Internet Relay Chat (IRC) Server. */
150	/* * Option 75: StreetTalk Server. */
151
152	/* * Option 119: Domain Search. */
153
154
155	VBoxNetDhcpCfg()
156	{
157	m_UpperAddr.u = UINT32_MAX;
158	m_LowerAddr.u = UINT32_MAX;
159	m_SubnetMask.u = UINT32_MAX;
160	m_cSecLease = 6060; / 1 hour */
161	}
162
163	/** Validates the configuration.
164	* @returns 0 on success, exit code + error message to stderr on failure. */
165	int validate(void)
166	{
167	if ( m_UpperAddr.u == UINT32_MAX
168	\|\| m_LowerAddr.u == UINT32_MAX
169	\|\| m_SubnetMask.u == UINT32_MAX)
170	{
171	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: Config is missing:");
172	if (m_UpperAddr.u == UINT32_MAX)
173	RTStrmPrintf(g_pStdErr, " --upper-ip");
174	if (m_LowerAddr.u == UINT32_MAX)
175	RTStrmPrintf(g_pStdErr, " --lower-ip");
176	if (m_SubnetMask.u == UINT32_MAX)
177	RTStrmPrintf(g_pStdErr, " --netmask");
178	return 2;
179	}
180
181	if (RT_N2H_U32(m_UpperAddr.u) < RT_N2H_U32(m_LowerAddr.u))
182	{
183	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: The --upper-ip value is lower than the --lower-ip one!\n"
184	" %d.%d.%d.%d < %d.%d.%d.%d\n",
185	m_UpperAddr.au8[0], m_UpperAddr.au8[1], m_UpperAddr.au8[2], m_UpperAddr.au8[3],
186	m_LowerAddr.au8[0], m_LowerAddr.au8[1], m_LowerAddr.au8[2], m_LowerAddr.au8[3]);
187	return 3;
188	}
189
190	/* the code goes insane if we have too many atm. lazy bird */
191	uint32_t cIPs = RT_N2H_U32(m_UpperAddr.u) - RT_N2H_U32(m_LowerAddr.u);
192	if (cIPs > 1024)
193	{
194	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: Too many IPs between --upper-ip and --lower-ip! %d (max 1024)\n"
195	" %d.%d.%d.%d < %d.%d.%d.%d\n",
196	cIPs,
197	m_UpperAddr.au8[0], m_UpperAddr.au8[1], m_UpperAddr.au8[2], m_UpperAddr.au8[3],
198	m_LowerAddr.au8[0], m_LowerAddr.au8[1], m_LowerAddr.au8[2], m_LowerAddr.au8[3]);
199	return 3;
200	}
201	return 0;
202	}
203
204	/**
205	* Is this config for one specific client?
206	*
207	* @return true / false.
208	*/
209	bool isOneSpecificClient(void) const
210	{
211	return m_LowerAddr.u == m_UpperAddr.u
212	&& m_MacAddresses.size() > 0;
213	}
214
215	/**
216	* Checks if this config matches the specified MAC address.
217	*
218	* @returns true / false.
219	*
220	* @param pMac The MAC address to match.
221	*/
222	bool matchesMacAddress(PCRTMAC pMac) const
223	{
224	size_t i = m_MacAddresses.size();
225	if (RT_LIKELY(i < 1))
226	return true; /* no entries == ALL wildcard match */
227
228	while (i--)
229	{
230	PCRTMAC pCur = &m_MacAddresses[i];
231	if ( pCur->au16[0] == pMac->au16[0]
232	&& pCur->au16[1] == pMac->au16[1]
233	&& pCur->au16[2] == pMac->au16[2])
234	return true;
235	}
236	return false;
237	}
238
239	};
240
241	/**
242	* DHCP lease.
243	*/
244	class VBoxNetDhcpLease
245	{
246	public:
247	typedef enum State
248	{
249	/** Invalid. */
250	kState_Invalid = 0,
251	/** The lease is free / released. */
252	kState_Free,
253	/** An offer has been made.
254	* Expire time indicates when the offer expires. */
255	kState_Offer,
256	/** The lease is active.
257	* Expire time indicates when the lease expires. */
258	kState_Active
259	} State;
260
261	/** The client MAC address. */
262	RTMAC m_MacAddress;
263	/** The IPv4 address. */
264	RTNETADDRIPV4 m_IPv4Address;
265
266	/** The current lease state. */
267	State m_enmState;
268	/** The lease expiration time. */
269	RTTIMESPEC m_ExpireTime;
270	/** Transaction ID. */
271	uint32_t m_xid;
272	/** The configuration for this lease. */
273	VBoxNetDhcpCfg *m_pCfg;
274
275	public:
276	/** Constructor taking an IPv4 address and a Config. */
277	VBoxNetDhcpLease(RTNETADDRIPV4 IPv4Addr, VBoxNetDhcpCfg *pCfg)
278	{
279	m_pCfg = pCfg;
280	m_IPv4Address = IPv4Addr;
281
282	m_MacAddress.au16[0] = m_MacAddress.au16[1] = m_MacAddress.au16[2] = 0xff;
283	m_enmState = kState_Free;
284	RTTimeSpecSetSeconds(&m_ExpireTime, 0);
285	m_xid = UINT32_MAX;
286	}
287
288	/** Destructor. */
289	~VBoxNetDhcpLease()
290	{
291	m_IPv4Address.u = UINT32_MAX;
292	m_pCfg = NULL;
293	m_MacAddress.au16[0] = m_MacAddress.au16[1] = m_MacAddress.au16[2] = 0xff;
294	m_enmState = kState_Free;
295	m_xid = UINT32_MAX;
296	}
297
298	void offer(uint32_t xid);
299	void activate(void);
300	void activate(uint32_t xid);
301	void release(void);
302	bool hasExpired(void) const;
303
304	/**
305	* Checks if the lease is in use or not.
306	*
307	* @returns true if active, false if free or expired.
308	*
309	* @param pNow The current time to use. Optional.
310	*/
311	bool isInUse(PCRTTIMESPEC pNow = NULL) const
312	{
313	if ( m_enmState == kState_Offer
314	\|\| m_enmState == kState_Active)
315	{
316	RTTIMESPEC Now;
317	if (!pNow)
318	pNow = RTTimeNow(&Now);
319	return RTTimeSpecGetSeconds(&m_ExpireTime) > RTTimeSpecGetSeconds(pNow);
320	}
321	return false;
322	}
323
324	/**
325	* Is this lease for one specific client?
326	*
327	* @return true/false.
328	*/
329	bool isOneSpecificClient(void) const
330	{
331	return m_pCfg
332	&& m_pCfg->isOneSpecificClient();
333	}
334
335	/**
336	* Is this lease currently being offered to a client.
337	*
338	* @returns true / false.
339	*/
340	bool isBeingOffered(void) const
341	{
342	return m_enmState == kState_Offer
343	&& isInUse();
344	}
345
346	/**
347	* Is the lease in the current config or not.
348	*
349	* When updating the config we might leave active leases behind which aren't
350	* included in the new config. These will have m_pCfg set to NULL and should be
351	* freed up when they expired.
352	*
353	* @returns true / false.
354	*/
355	bool isInCurrentConfig(void) const
356	{
357	return m_pCfg != NULL;
358	}
359	};
360
361	/**
362	* DHCP server instance.
363	*/
364	class VBoxNetDhcp
365	{
366	public:
367	VBoxNetDhcp();
368	virtual ~VBoxNetDhcp();
369
370	int parseArgs(int argc, char **argv);
371	int tryGoOnline(void);
372	int run(void);
373
374	protected:
375	int addConfig(VBoxNetDhcpCfg *pCfg);
376	void explodeConfig(void);
377
378	bool handleDhcpMsg(uint8_t uMsgType, PCRTNETBOOTP pDhcpMsg, size_t cb);
379	bool handleDhcpReqDiscover(PCRTNETBOOTP pDhcpMsg, size_t cb);
380	bool handleDhcpReqRequest(PCRTNETBOOTP pDhcpMsg, size_t cb);
381	bool handleDhcpReqDecline(PCRTNETBOOTP pDhcpMsg, size_t cb);
382	bool handleDhcpReqRelease(PCRTNETBOOTP pDhcpMsg, size_t cb);
383	void makeDhcpReply(uint8_t uMsgType, VBoxNetDhcpLease *pLease, PCRTNETBOOTP pDhcpMsg, size_t cb);
384
385	VBoxNetDhcpLease *findLeaseByMacAddress(PCRTMAC pMacAddress, bool fAnyState);
386	VBoxNetDhcpLease *findLeaseByIpv4AndMacAddresses(RTNETADDRIPV4 IPv4Addr, PCRTMAC pMacAddress, bool fAnyState);
387	VBoxNetDhcpLease *newLease(PCRTNETBOOTP pDhcpMsg, size_t cb);
388
389	static uint8_t const findOption(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, size_t pcbMaxOpt);
390	static bool findOptionIPv4Addr(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, PRTNETADDRIPV4 pIPv4Addr);
391
392	inline void debugPrint( int32_t iMinLevel, bool fMsg, const char *pszFmt, ...) const;
393	void debugPrintV(int32_t iMinLevel, bool fMsg, const char *pszFmt, va_list va) const;
394	static const char *debugDhcpName(uint8_t uMsgType);
395
396	protected:
397	/** @name The server configuration data members.
398	* @{ */
399	std::string m_Name;
400	std::string m_Network;
401	std::string m_TrunkName;
402	INTNETTRUNKTYPE m_enmTrunkType;
403	RTMAC m_MacAddress;
404	RTNETADDRIPV4 m_Ipv4Address;
405	std::string m_LeaseDBName;
406	/** @} */
407
408	/** The current configs. */
409	std::vector<VBoxNetDhcpCfg *> m_Cfgs;
410
411	/** The current leases. */
412	std::vector<VBoxNetDhcpLease> m_Leases;
413
414	/** @name The network interface
415	* @{ */
416	PSUPDRVSESSION m_pSession;
417	uint32_t m_cbSendBuf;
418	uint32_t m_cbRecvBuf;
419	INTNETIFHANDLE m_hIf; /*< The handle to the network interface. /
420	PINTNETBUF m_pIfBuf; /*< Interface buffer. /
421	/** @} */
422
423	/** @name Debug stuff
424	* @{ */
425	int32_t m_cVerbosity;
426	uint8_t m_uCurMsgType;
427	size_t m_cbCurMsg;
428	PCRTNETBOOTP m_pCurMsg;
429	VBOXNETUDPHDRS m_CurHdrs;
430	/** @} */
431	};
432
433
434	/*******************************************************************************
435	* Global Variables *
436	*******************************************************************************/
437	/** Pointer to the DHCP server. */
438	static VBoxNetDhcp *g_pDhcp;
439
440
441	/**
442	* Offer this lease to a client.
443	*
444	* @param xid The transaction ID.
445	*/
446	void VBoxNetDhcpLease::offer(uint32_t xid)
447	{
448	m_enmState = kState_Offer;
449	m_xid = xid;
450	RTTimeNow(&m_ExpireTime);
451	RTTimeSpecAddSeconds(&m_ExpireTime, 60);
452	}
453
454
455	/**
456	* Activate this lease (i.e. a client is now using it).
457	*/
458	void VBoxNetDhcpLease::activate(void)
459	{
460	m_enmState = kState_Active;
461	RTTimeNow(&m_ExpireTime);
462	RTTimeSpecAddSeconds(&m_ExpireTime, m_pCfg ? m_pCfg->m_cSecLease : 60); /* m_pCfg can be NULL right now... */
463	}
464
465
466	/**
467	* Activate this lease with a new transaction ID.
468	*
469	* @param xid The transaction ID.
470	* @todo check if this is really necessary.
471	*/
472	void VBoxNetDhcpLease::activate(uint32_t xid)
473	{
474	activate();
475	m_xid = xid;
476	}
477
478
479	/**
480	* Release a lease either upon client request or because it didn't quite match a
481	* DHCP_REQUEST.
482	*/
483	void VBoxNetDhcpLease::release(void)
484	{
485	m_enmState = kState_Free;
486	RTTimeNow(&m_ExpireTime);
487	RTTimeSpecAddSeconds(&m_ExpireTime, 5);
488	}
489
490
491	/**
492	* Checks if the lease has expired or not.
493	*
494	* This just checks the expiration time not the state. This is so that this
495	* method will work for reusing RELEASEd leases when the client comes back after
496	* a reboot or ipconfig /renew. Callers not interested in info on released
497	* leases should check the state first.
498	*
499	* @returns true if expired, false if not.
500	*/
501	bool VBoxNetDhcpLease::hasExpired() const
502	{
503	RTTIMESPEC Now;
504	return RTTimeSpecGetSeconds(&m_ExpireTime) > RTTimeSpecGetSeconds(RTTimeNow(&Now));
505	}
506
507
508
509
510	/**
511	* Construct a DHCP server with a default configuration.
512	*/
513	VBoxNetDhcp::VBoxNetDhcp()
514	{
515	m_Name = "VBoxNetDhcp";
516	m_Network = "VBoxNetDhcp";
517	m_TrunkName = "";
518	m_enmTrunkType = kIntNetTrunkType_WhateverNone;
519	m_MacAddress.au8[0] = 0x08;
520	m_MacAddress.au8[1] = 0x00;
521	m_MacAddress.au8[2] = 0x27;
522	m_MacAddress.au8[3] = 0x40;
523	m_MacAddress.au8[4] = 0x41;
524	m_MacAddress.au8[5] = 0x42;
525	m_Ipv4Address.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2, 5)));
526
527	m_pSession = NIL_RTR0PTR;
528	m_cbSendBuf = 8192;
529	m_cbRecvBuf = 51200; /** @todo tune to 64 KB with help from SrvIntR0 */
530	m_hIf = INTNET_HANDLE_INVALID;
531	m_pIfBuf = NULL;
532
533	m_cVerbosity = 0;
534	m_uCurMsgType = UINT8_MAX;
535	m_cbCurMsg = 0;
536	m_pCurMsg = NULL;
537	memset(&m_CurHdrs, '\0', sizeof(m_CurHdrs));
538
539	#if 0 /* enable to hack the code without a mile long argument list. */
540	VBoxNetDhcpCfg *pDefCfg = new VBoxNetDhcpCfg();
541	pDefCfg->m_LowerAddr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2,100)));
542	pDefCfg->m_UpperAddr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2,250)));
543	pDefCfg->m_SubnetMask.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8(255,255,255, 0)));
544	RTNETADDRIPV4 Addr;
545	Addr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2, 1)));
546	pDefCfg->m_Routers.push_back(Addr);
547	Addr.u = RT_H2N_U32_C(RT_BSWAP_U32_C(RT_MAKE_U32_FROM_U8( 10, 0, 2, 2)));
548	pDefCfg->m_DNSes.push_back(Addr);
549	pDefCfg->m_DomainName = "vboxnetdhcp.org";
550	#if 0
551	pDefCfg->m_cSecLease = 6060; / 1 hour */
552	#else
553	pDefCfg->m_cSecLease = 30; /* sec */
554	#endif
555	pDefCfg->m_TftpServer = "10.0.2.3"; //??
556	this->addConfig(pDefCfg);
557	#endif
558	}
559
560
561	/**
562	* Destruct a DHCP server.
563	*/
564	VBoxNetDhcp::~VBoxNetDhcp()
565	{
566	/*
567	* Close the interface connection.
568	*/
569	if (m_hIf != INTNET_HANDLE_INVALID)
570	{
571	INTNETIFCLOSEREQ CloseReq;
572	CloseReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
573	CloseReq.Hdr.cbReq = sizeof(CloseReq);
574	CloseReq.pSession = m_pSession;
575	CloseReq.hIf = m_hIf;
576	m_hIf = INTNET_HANDLE_INVALID;
577	int rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_CLOSE, 0, &CloseReq.Hdr);
578	AssertRC(rc);
579	}
580
581	if (m_pSession)
582	{
583	SUPR3Term(false /fForced/);
584	m_pSession = NIL_RTR0PTR;
585	}
586	}
587
588
589	/**
590	* Adds a config to the tail.
591	*
592	* @returns See VBoxNetDHCP::validate().
593	* @param pCfg The config too add.
594	* This object will be consumed by this call!
595	*/
596	int VBoxNetDhcp::addConfig(VBoxNetDhcpCfg *pCfg)
597	{
598	int rc = 0;
599	if (pCfg)
600	{
601	rc = pCfg->validate();
602	if (!rc)
603	m_Cfgs.push_back(pCfg);
604	else
605	delete pCfg;
606	}
607	return rc;
608	}
609
610
611	/**
612	* Explodes the config into leases.
613	*
614	* @remarks This code is brute force and not very fast nor memory efficient.
615	* We will have to revisit this later.
616	*
617	* @remarks If an IP has been reconfigured for a fixed mac address and it's
618	* already leased to a client, we it won't be available until the
619	* client releases its lease or it expires.
620	*/
621	void VBoxNetDhcp::explodeConfig(void)
622	{
623	RTTIMESPEC Now;
624	RTTimeNow(&Now);
625
626	/*
627	* Remove all non-active leases from the vector and zapping the
628	* config pointers of the once left behind.
629	*/
630	std::vector<VBoxNetDhcpLease>::iterator Itr = m_Leases.begin();
631	while (Itr != m_Leases.end())
632	{
633	if (!Itr->isInUse(&Now))
634	Itr = m_Leases.erase(Itr);
635	else
636	{
637	Itr->m_pCfg = NULL;
638	Itr++;
639	}
640	}
641
642	/*
643	* Loop thru the configurations in reverse order, giving the last
644	* configs priority of the newer ones.
645	*/
646	size_t iCfg = m_Cfgs.size();
647	while (iCfg-- > 0)
648	{
649	VBoxNetDhcpCfg *pCfg = m_Cfgs[iCfg];
650
651	/* Expand the IP lease range. */
652	uint32_t const uLast = RT_N2H_U32(pCfg->m_UpperAddr.u);
653	for (uint32_t i = RT_N2H_U32(pCfg->m_LowerAddr.u); i <= uLast; i++)
654	{
655	RTNETADDRIPV4 IPv4Addr;
656	IPv4Addr.u = RT_H2N_U32(i);
657
658	/* Check if it exists and is configured. */
659	VBoxNetDhcpLease *pLease = NULL;
660	for (size_t j = 0; j < m_Leases.size(); j++)
661	if (m_Leases[j].m_IPv4Address.u == IPv4Addr.u)
662	{
663	pLease = &m_Leases[j];
664	break;
665	}
666	if (pLease)
667	{
668	if (!pLease->m_pCfg)
669	pLease->m_pCfg = pCfg;
670	}
671	else
672	{
673	/* add it. */
674	VBoxNetDhcpLease NewLease(IPv4Addr, pCfg);
675	m_Leases.push_back(NewLease);
676	debugPrint(10, false, "exploseConfig: new lease %d.%d.%d.%d",
677	IPv4Addr.au8[0], IPv4Addr.au8[1], IPv4Addr.au8[2], IPv4Addr.au8[3]);
678	}
679	}
680	}
681	}
682
683
684	/**
685	* Parse the arguments.
686	*
687	* @returns 0 on success, fully bitched exit code on failure.
688	*
689	* @param argc Argument count.
690	* @param argv Argument vector.
691	*/
692	int VBoxNetDhcp::parseArgs(int argc, char **argv)
693	{
694	static const RTGETOPTDEF s_aOptionDefs[] =
695	{
696	{ "--name", 'N', RTGETOPT_REQ_STRING },
697	{ "--network", 'n', RTGETOPT_REQ_STRING },
698	{ "--trunk-name", 't', RTGETOPT_REQ_STRING },
699	{ "--trunk-type", 'T', RTGETOPT_REQ_STRING },
700	{ "--mac-address", 'a', RTGETOPT_REQ_MACADDR },
701	{ "--ip-address", 'i', RTGETOPT_REQ_IPV4ADDR },
702	{ "--lease-db", 'D', RTGETOPT_REQ_STRING },
703	{ "--verbose", 'v', RTGETOPT_REQ_NOTHING },
704
705	{ "--begin-config", 'b', RTGETOPT_REQ_NOTHING },
706	{ "--gateway", 'g', RTGETOPT_REQ_IPV4ADDR },
707	{ "--lower-ip", 'l', RTGETOPT_REQ_IPV4ADDR },
708	{ "--upper-ip", 'u', RTGETOPT_REQ_IPV4ADDR },
709	{ "--netmask", 'm', RTGETOPT_REQ_IPV4ADDR },
710	};
711
712	RTGETOPTSTATE State;
713	int rc = RTGetOptInit(&State, argc, argv, &s_aOptionDefs[0], RT_ELEMENTS(s_aOptionDefs), 0, 0 /fFlags/);
714	AssertRCReturn(rc, 49);
715
716	VBoxNetDhcpCfg *pCurCfg = NULL;
717	for (;;)
718	{
719	RTGETOPTUNION Val;
720	rc = RTGetOpt(&State, &Val);
721	if (!rc)
722	break;
723	switch (rc)
724	{
725	case 'N':
726	m_Name = Val.psz;
727	break;
728	case 'n':
729	m_Network = Val.psz;
730	break;
731	case 't':
732	m_TrunkName = Val.psz;
733	break;
734	case 'T':
735	if (!strcmp(Val.psz, "none"))
736	m_enmTrunkType = kIntNetTrunkType_None;
737	else if (!strcmp(Val.psz, "whatever"))
738	m_enmTrunkType = kIntNetTrunkType_WhateverNone;
739	else if (!strcmp(Val.psz, "netflt"))
740	m_enmTrunkType = kIntNetTrunkType_NetFlt;
741	else if (!strcmp(Val.psz, "netadp"))
742	m_enmTrunkType = kIntNetTrunkType_NetAdp;
743	else if (!strcmp(Val.psz, "srvnat"))
744	m_enmTrunkType = kIntNetTrunkType_SrvNat;
745	else
746	{
747	RTStrmPrintf(g_pStdErr, "Invalid trunk type '%s'\n", Val.psz);
748	return 1;
749	}
750	break;
751	case 'a':
752	m_MacAddress = Val.MacAddr;
753	break;
754	case 'i':
755	m_Ipv4Address = Val.IPv4Addr;
756	break;
757	case 'd':
758	m_LeaseDBName = Val.psz;
759	break;
760
761	case 'v':
762	m_cVerbosity++;
763	break;
764
765	/* Begin config. */
766	case 'b':
767	rc = addConfig(pCurCfg);
768	if (rc)
769	break;
770	pCurCfg = NULL;
771	/* fall thru */
772
773	/* config specific ones. */
774	case 'g':
775	case 'l':
776	case 'u':
777	case 'm':
778	if (!pCurCfg)
779	{
780	pCurCfg = new VBoxNetDhcpCfg();
781	if (!pCurCfg)
782	{
783	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: new VBoxDhcpCfg failed\n");
784	return 1;
785	}
786	}
787
788	switch (rc)
789	{
790	case 'g':
791	pCurCfg->m_Routers.push_back(Val.IPv4Addr);
792	break;
793
794	case 'l':
795	pCurCfg->m_LowerAddr = Val.IPv4Addr;
796	break;
797
798	case 'u':
799	pCurCfg->m_UpperAddr = Val.IPv4Addr;
800	break;
801
802	case 'm':
803	pCurCfg->m_SubnetMask = Val.IPv4Addr;
804	break;
805
806	case 0: /* ignore */ break;
807	default:
808	AssertMsgFailed(("%d", rc));
809	return 1;
810	}
811	break;
812
813	case 'V':
814	RTPrintf("%sr%u\n", RTBldCfgVersion(), RTBldCfgRevision());
815	return 1;
816
817	case 'h':
818	RTPrintf("VBoxNetDHCP Version %s\n"
819	"(C) 2009-" VBOX_C_YEAR " " VBOX_VENDOR "\n"
820	"All rights reserved.\n"
821	"\n"
822	"Usage: VBoxNetDHCP <options>\n"
823	"\n"
824	"Options:\n",
825	RTBldCfgVersion());
826	for (size_t i = 0; i < RT_ELEMENTS(s_aOptionDefs); i++)
827	RTPrintf(" -%c, %s\n", s_aOptionDefs[i].iShort, s_aOptionDefs[i].pszLong);
828	return 1;
829
830	default:
831	rc = RTGetOptPrintError(rc, &Val);
832	RTPrintf("Use --help for more information.\n");
833	return rc;
834	}
835	}
836
837	/*
838	* Do the reconfig. (move this later)
839	*/
840	if (!rc)
841	explodeConfig();
842
843	return rc;
844	}
845
846
847	/**
848	* Tries to connect to the internal network.
849	*
850	* @returns 0 on success, exit code + error message to stderr on failure.
851	*/
852	int VBoxNetDhcp::tryGoOnline(void)
853	{
854	/*
855	* Open the session, load ring-0 and issue the request.
856	*/
857	int rc = SUPR3Init(&m_pSession);
858	if (RT_FAILURE(rc))
859	{
860	m_pSession = NIL_RTR0PTR;
861	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3Init -> %Rrc", rc);
862	return 1;
863	}
864
865	char szPath[RTPATH_MAX];
866	rc = RTPathExecDir(szPath, sizeof(szPath) - sizeof("/VMMR0.r0"));
867	if (RT_FAILURE(rc))
868	{
869	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: RTPathProgram -> %Rrc", rc);
870	return 1;
871	}
872
873	rc = SUPR3LoadVMM(strcat(szPath, "/VMMR0.r0"));
874	if (RT_FAILURE(rc))
875	{
876	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3LoadVMM(\"%s\") -> %Rrc", szPath, rc);
877	return 1;
878	}
879
880	/*
881	* Create the open request.
882	*/
883	INTNETOPENREQ OpenReq;
884	OpenReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
885	OpenReq.Hdr.cbReq = sizeof(OpenReq);
886	OpenReq.pSession = m_pSession;
887	strncpy(OpenReq.szNetwork, m_Network.c_str(), sizeof(OpenReq.szNetwork));
888	OpenReq.szNetwork[sizeof(OpenReq.szNetwork) - 1] = '\0';
889	strncpy(OpenReq.szTrunk, m_TrunkName.c_str(), sizeof(OpenReq.szTrunk));
890	OpenReq.szTrunk[sizeof(OpenReq.szTrunk) - 1] = '\0';
891	OpenReq.enmTrunkType = m_enmTrunkType;
892	OpenReq.fFlags = 0; /** @todo check this */
893	OpenReq.cbSend = m_cbSendBuf;
894	OpenReq.cbRecv = m_cbRecvBuf;
895	OpenReq.hIf = INTNET_HANDLE_INVALID;
896
897	/*
898	* Issue the request.
899	*/
900	debugPrint(2, false, "attempting to open/create network \"%s\"...", OpenReq.szNetwork);
901	rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_OPEN, 0, &OpenReq.Hdr);
902	if (RT_SUCCESS(rc))
903	{
904	m_hIf = OpenReq.hIf;
905	debugPrint(1, false, "successfully opened/created \"%s\" - hIf=%#x", OpenReq.szNetwork, m_hIf);
906
907	/*
908	* Get the ring-3 address of the shared interface buffer.
909	*/
910	INTNETIFGETBUFFERPTRSREQ GetBufferPtrsReq;
911	GetBufferPtrsReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
912	GetBufferPtrsReq.Hdr.cbReq = sizeof(GetBufferPtrsReq);
913	GetBufferPtrsReq.pSession = m_pSession;
914	GetBufferPtrsReq.hIf = m_hIf;
915	GetBufferPtrsReq.pRing3Buf = NULL;
916	GetBufferPtrsReq.pRing0Buf = NIL_RTR0PTR;
917	rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_GET_BUFFER_PTRS, 0, &GetBufferPtrsReq.Hdr);
918	if (RT_SUCCESS(rc))
919	{
920	PINTNETBUF pBuf = GetBufferPtrsReq.pRing3Buf;
921	debugPrint(1, false, "pBuf=%p cbBuf=%d cbSend=%d cbRecv=%d",
922	pBuf, pBuf->cbBuf, pBuf->cbSend, pBuf->cbRecv);
923	m_pIfBuf = pBuf;
924
925	/*
926	* Activate the interface.
927	*/
928	INTNETIFSETACTIVEREQ ActiveReq;
929	ActiveReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
930	ActiveReq.Hdr.cbReq = sizeof(ActiveReq);
931	ActiveReq.pSession = m_pSession;
932	ActiveReq.hIf = m_hIf;
933	ActiveReq.fActive = true;
934	rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_SET_ACTIVE, 0, &ActiveReq.Hdr);
935	if (RT_SUCCESS(rc))
936	return 0;
937
938	/* bail out */
939	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3CallVMMR0Ex(,VMMR0_DO_INTNET_IF_SET_PROMISCUOUS_MODE,) failed, rc=%Rrc\n", rc);
940	}
941	else
942	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3CallVMMR0Ex(,VMMR0_DO_INTNET_IF_GET_BUFFER_PTRS,) failed, rc=%Rrc\n", rc);
943	}
944	else
945	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3CallVMMR0Ex(,VMMR0_DO_INTNET_OPEN,) failed, rc=%Rrc\n", rc);
946
947	return RT_SUCCESS(rc) ? 0 : 1;
948	}
949
950
951	/**
952	* Runs the DHCP server.
953	*
954	* @returns exit code + error message to stderr on failure, won't return on
955	* success (you must kill this process).
956	*/
957	int VBoxNetDhcp::run(void)
958	{
959	/*
960	* The loop.
961	*/
962	PINTNETRINGBUF pRingBuf = &m_pIfBuf->Recv;
963	for (;;)
964	{
965	/*
966	* Wait for a packet to become available.
967	*/
968	INTNETIFWAITREQ WaitReq;
969	WaitReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
970	WaitReq.Hdr.cbReq = sizeof(WaitReq);
971	WaitReq.pSession = m_pSession;
972	WaitReq.hIf = m_hIf;
973	WaitReq.cMillies = 2000; /* 2 secs - the sleep is for some reason uninterruptible... / /* @todo fix interruptability in SrvIntNet! */
974	int rc = SUPR3CallVMMR0Ex(NIL_RTR0PTR, NIL_VMCPUID, VMMR0_DO_INTNET_IF_WAIT, 0, &WaitReq.Hdr);
975	if (RT_FAILURE(rc))
976	{
977	if (rc == VERR_TIMEOUT)
978	continue;
979	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: VMMR0_DO_INTNET_IF_WAIT returned %Rrc\n", rc);
980	return 1;
981	}
982
983	/*
984	* Process the receive buffer.
985	*/
986	while (IntNetRingHasMoreToRead(pRingBuf))
987	{
988	size_t cb;
989	void *pv = VBoxNetUDPMatch(m_pIfBuf, RTNETIPV4_PORT_BOOTPS, &m_MacAddress,
990	VBOXNETUDP_MATCH_UNICAST \| VBOXNETUDP_MATCH_BROADCAST \| VBOXNETUDP_MATCH_CHECKSUM
991	\| (m_cVerbosity > 2 ? VBOXNETUDP_MATCH_PRINT_STDERR : 0),
992	&m_CurHdrs, &cb);
993	if (pv && cb)
994	{
995	PCRTNETBOOTP pDhcpMsg = (PCRTNETBOOTP)pv;
996	m_pCurMsg = pDhcpMsg;
997	m_cbCurMsg = cb;
998
999	uint8_t uMsgType;
1000	if (RTNetIPv4IsDHCPValid(NULL /* why is this here? */, pDhcpMsg, cb, &uMsgType))
1001	{
1002	m_uCurMsgType = uMsgType;
1003	handleDhcpMsg(uMsgType, pDhcpMsg, cb);
1004	m_uCurMsgType = UINT8_MAX;
1005	}
1006	else
1007	debugPrint(1, true, "VBoxNetDHCP: Skipping invalid DHCP packet.\n"); /** @todo handle pure bootp clients too? */
1008
1009	m_pCurMsg = NULL;
1010	m_cbCurMsg = 0;
1011	}
1012	else if (VBoxNetArpHandleIt(m_pSession, m_hIf, m_pIfBuf, &m_MacAddress, m_Ipv4Address))
1013	{
1014	/* nothing */
1015	}
1016
1017	/* Advance to the next frame. */
1018	IntNetRingSkipFrame(pRingBuf);
1019	}
1020	}
1021
1022	return 0;
1023	}
1024
1025
1026	/**
1027	* Handles a DHCP message.
1028	*
1029	* @returns true if handled, false if not.
1030	* @param uMsgType The message type.
1031	* @param pDhcpMsg The DHCP message.
1032	* @param cb The size of the DHCP message.
1033	*/
1034	bool VBoxNetDhcp::handleDhcpMsg(uint8_t uMsgType, PCRTNETBOOTP pDhcpMsg, size_t cb)
1035	{
1036	if (pDhcpMsg->bp_op == RTNETBOOTP_OP_REQUEST)
1037	{
1038	switch (uMsgType)
1039	{
1040	case RTNET_DHCP_MT_DISCOVER:
1041	return handleDhcpReqDiscover(pDhcpMsg, cb);
1042
1043	case RTNET_DHCP_MT_REQUEST:
1044	return handleDhcpReqRequest(pDhcpMsg, cb);
1045
1046	case RTNET_DHCP_MT_DECLINE:
1047	return handleDhcpReqDecline(pDhcpMsg, cb);
1048
1049	case RTNET_DHCP_MT_RELEASE:
1050	return handleDhcpReqRelease(pDhcpMsg, cb);
1051
1052	case RTNET_DHCP_MT_INFORM:
1053	debugPrint(0, true, "Should we handle this?");
1054	break;
1055
1056	default:
1057	debugPrint(0, true, "Unexpected.");
1058	break;
1059	}
1060	}
1061	return false;
1062	}
1063
1064
1065	/**
1066	* The client is requesting an offer.
1067	*
1068	* @returns true.
1069	*
1070	* @param pDhcpMsg The message.
1071	* @param cb The message size.
1072	*/
1073	bool VBoxNetDhcp::handleDhcpReqDiscover(PCRTNETBOOTP pDhcpMsg, size_t cb)
1074	{
1075	/*
1076	* The newLease() method contains logic for finding current leases
1077	* and reusing them in case the client is forgetful.
1078	*/
1079	VBoxNetDhcpLease *pLease = newLease(pDhcpMsg, cb);
1080	if (!pLease)
1081	return false;
1082	debugPrint(1, true, "Offering %d.%d.%d.%d to %.6Rhxs xid=%#x",
1083	pLease->m_IPv4Address.au8[0],
1084	pLease->m_IPv4Address.au8[1],
1085	pLease->m_IPv4Address.au8[2],
1086	pLease->m_IPv4Address.au8[3],
1087	&pDhcpMsg->bp_chaddr.Mac,
1088	pDhcpMsg->bp_xid);
1089	pLease->offer(pDhcpMsg->bp_xid);
1090
1091	makeDhcpReply(RTNET_DHCP_MT_OFFER, pLease, pDhcpMsg, cb);
1092	return true;
1093	}
1094
1095
1096	/**
1097	* The client is requesting an offer.
1098	*
1099	* @returns true.
1100	*
1101	* @param pDhcpMsg The message.
1102	* @param cb The message size.
1103	*/
1104	bool VBoxNetDhcp::handleDhcpReqRequest(PCRTNETBOOTP pDhcpMsg, size_t cb)
1105	{
1106	/** @todo Probably need to match the server IP here to work correctly with
1107	* other servers. */
1108	/** @todo This code isn't entirely correct and quite a bit of a hack, but it
1109	* will have to do for now as the right thing (tm) is very complex.
1110	* Part of the fun is verifying that the request is something we can
1111	* and should handle. */
1112
1113	/*
1114	* Try find the lease by the requested address + client MAC address.
1115	*/
1116	VBoxNetDhcpLease *pLease = NULL;
1117	RTNETADDRIPV4 IPv4Addr;
1118	bool fReqAddr = findOptionIPv4Addr(RTNET_DHCP_OPT_REQ_ADDR, pDhcpMsg, cb, &IPv4Addr);
1119	if (fReqAddr)
1120	{
1121	fReqAddr = true;
1122	pLease = findLeaseByIpv4AndMacAddresses(IPv4Addr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1123	}
1124
1125	/*
1126	* Try find the lease by the client IP address + client MAC address.
1127	*/
1128	if ( !pLease
1129	&& pDhcpMsg->bp_ciaddr.u)
1130	pLease = findLeaseByIpv4AndMacAddresses(pDhcpMsg->bp_ciaddr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1131
1132	#if 0 /** @todo client id stuff - it doesn't make sense here imho, we need IP + MAC. What would make sense
1133	though is to compare the client id with what we've got in the lease and use it to root out
1134	bad requests. */
1135	/*
1136	* Try find the lease by using the client id.
1137	*/
1138	if (!pLease)
1139	{
1140	size_t cbClientID = 0;
1141	uint8_t const *pbClientID = findOption(RTNET_DHCP_OPT_CLIENT_ID, pDhcpMsg, cb, &cbClientID);
1142	if ( pbClientID
1143	&& cbClientID == sizeof(RTMAC) + 1
1144	&& pbClientID[0] == RTNET_ARP_ETHER
1145	&&
1146	)
1147	{
1148	pLease = findLeaseByIpv4AndMacAddresses(pDhcpMsg->bp_ciaddr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1149	}
1150	}
1151	#endif
1152
1153	/*
1154	* Validate the lease that's requested.
1155	* We've already check the MAC and IP addresses.
1156	*/
1157	bool fAckIt = false;
1158	if (pLease)
1159	{
1160	if (pLease->isBeingOffered())
1161	{
1162	if (pLease->m_xid == pDhcpMsg->bp_xid)
1163	debugPrint(2, true, "REQUEST for offered lease.");
1164	else
1165	debugPrint(2, true, "REQUEST for offered lease, xid mismatch. Expected %#x, got %#x.",
1166	pLease->m_xid, pDhcpMsg->bp_xid);
1167	pLease->activate(pDhcpMsg->bp_xid);
1168	fAckIt = true;
1169	}
1170	else if (!pLease->isInCurrentConfig())
1171	debugPrint(1, true, "REQUEST for obsolete lease -> NAK");
1172	else if (fReqAddr != (pDhcpMsg->bp_ciaddr.u != 0)) // ???
1173	{
1174	/** @todo this ain't safe. */
1175	debugPrint(1, true, "REQUEST for lease not on offer, assuming renewal. lease_xid=%#x bp_xid=%#x",
1176	pLease->m_xid, pDhcpMsg->bp_xid);
1177	fAckIt = true;
1178	pLease->activate(pDhcpMsg->bp_xid);
1179	}
1180	else
1181	debugPrint(1, true, "REQUEST for lease not on offer, NAK it.");
1182	}
1183
1184	/*
1185	* NAK if if no lease was found.
1186	*/
1187	if (fAckIt)
1188	{
1189	debugPrint(1, false, "ACK'ing DHCP_REQUEST");
1190	makeDhcpReply(RTNET_DHCP_MT_ACK, pLease, pDhcpMsg, cb);
1191	}
1192	else
1193	{
1194	debugPrint(1, false, "NAK'ing DHCP_REQUEST");
1195	makeDhcpReply(RTNET_DHCP_MT_NAC, NULL, pDhcpMsg, cb);
1196	}
1197
1198	return true;
1199	}
1200
1201
1202	/**
1203	* The client is declining an offer we've made.
1204	*
1205	* @returns true.
1206	*
1207	* @param pDhcpMsg The message.
1208	* @param cb The message size.
1209	*/
1210	bool VBoxNetDhcp::handleDhcpReqDecline(PCRTNETBOOTP pDhcpMsg, size_t cb)
1211	{
1212	/** @todo Probably need to match the server IP here to work correctly with
1213	* other servers. */
1214
1215	/*
1216	* The client is supposed to pass us option 50, requested address,
1217	* from the offer. We also match the lease state. Apparently the
1218	* MAC address is not supposed to be checked here.
1219	*/
1220
1221	/** @todo this is not required in the initial implementation, do it later. */
1222	debugPrint(1, true, "DECLINE is not implemented");
1223	return true;
1224	}
1225
1226
1227	/**
1228	* The client is releasing its lease - good boy.
1229	*
1230	* @returns true.
1231	*
1232	* @param pDhcpMsg The message.
1233	* @param cb The message size.
1234	*/
1235	bool VBoxNetDhcp::handleDhcpReqRelease(PCRTNETBOOTP pDhcpMsg, size_t cb)
1236	{
1237	/** @todo Probably need to match the server IP here to work correctly with
1238	* other servers. */
1239
1240	/*
1241	* The client may pass us option 61, client identifier, which we should
1242	* use to find the lease by.
1243	*
1244	* We're matching MAC address and lease state as well.
1245	*/
1246
1247	/*
1248	* If no client identifier or if we couldn't find a lease by using it,
1249	* we will try look it up by the client IP address.
1250	*/
1251
1252
1253	/*
1254	* If found, release it.
1255	*/
1256
1257
1258	/** @todo this is not required in the initial implementation, do it later. */
1259	debugPrint(1, true, "RELEASE is not implemented");
1260	return true;
1261	}
1262
1263
1264	/**
1265	* Helper class for stuffing DHCP options into a reply packet.
1266	*/
1267	class VBoxNetDhcpWriteCursor
1268	{
1269	private:
1270	uint8_t m_pbCur; /< The current cursor position. /
1271	uint8_t m_pbEnd; /< The end the current option space. /
1272	uint8_t m_pfOverload; /< Pointer to the flags of the overload option. /
1273	uint8_t m_fUsed; /*< Overload fields that have been used. /
1274	PRTNETDHCPOPT m_pOpt; /*< The current option. /
1275	PRTNETBOOTP m_pDhcp; /*< The DHCP packet. /
1276	bool m_fOverflowed; /*< Set if we've overflowed, otherwise false. /
1277
1278	public:
1279	/** Instantiate an option cursor for the specified DHCP message. */
1280	VBoxNetDhcpWriteCursor(PRTNETBOOTP pDhcp, size_t cbDhcp) :
1281	m_pbCur(&pDhcp->bp_vend.Dhcp.dhcp_opts[0]),
1282	m_pbEnd((uint8_t *)pDhcp + cbDhcp),
1283	m_pfOverload(NULL),
1284	m_fUsed(0),
1285	m_pOpt(NULL),
1286	m_pDhcp(pDhcp),
1287	m_fOverflowed(false)
1288	{
1289	AssertPtr(pDhcp);
1290	Assert(cbDhcp > RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts[10]));
1291	}
1292
1293	/** Destructor. */
1294	~VBoxNetDhcpWriteCursor()
1295	{
1296	m_pbCur = m_pbEnd = m_pfOverload = NULL;
1297	m_pOpt = NULL;
1298	m_pDhcp = NULL;
1299	}
1300
1301	/**
1302	* Try use the bp_file field.
1303	* @returns true if not overloaded, false otherwise.
1304	*/
1305	bool useBpFile(void)
1306	{
1307	if ( m_pfOverload
1308	&& (*m_pfOverload & 1))
1309	return false;
1310	m_fUsed \|= 1 /* bp_file flag*/;
1311	return true;
1312	}
1313
1314
1315	/**
1316	* Try overload more BOOTP fields
1317	*/
1318	bool overloadMore(void)
1319	{
1320	/* switch option area. */
1321	uint8_t *pbNew;
1322	uint8_t *pbNewEnd;
1323	uint8_t fField;
1324	if (!(m_fUsed & 1))
1325	{
1326	fField = 1;
1327	pbNew = &m_pDhcp->bp_file[0];
1328	pbNewEnd = &m_pDhcp->bp_file[sizeof(m_pDhcp->bp_file)];
1329	}
1330	else if (!(m_fUsed & 2))
1331	{
1332	fField = 2;
1333	pbNew = &m_pDhcp->bp_sname[0];
1334	pbNewEnd = &m_pDhcp->bp_sname[sizeof(m_pDhcp->bp_sname)];
1335	}
1336	else
1337	return false;
1338
1339	if (!m_pfOverload)
1340	{
1341	/* Add an overload option. */
1342	*m_pbCur++ = RTNET_DHCP_OPT_OPTION_OVERLOAD;
1343	*m_pbCur++ = fField;
1344	m_pfOverload = m_pbCur;
1345	m_pbCur++ = 1; / bp_file flag */
1346	}
1347	else
1348	*m_pfOverload \|= fField;
1349
1350	/* pad current option field */
1351	while (m_pbCur != m_pbEnd)
1352	m_pbCur++ = RTNET_DHCP_OPT_PAD; /* @todo not sure if this stuff is at all correct... */
1353
1354	/* switch */
1355	m_pbCur = pbNew;
1356	m_pbEnd = pbNewEnd;
1357	return true;
1358	}
1359
1360	/**
1361	* Begin an option.
1362	*
1363	* @returns true on succes, false if we're out of space.
1364	*
1365	* @param uOption The option number.
1366	* @param cb The amount of data.
1367	*/
1368	bool begin(uint8_t uOption, size_t cb)
1369	{
1370	/* Check that the data of the previous option has all been written. */
1371	Assert( !m_pOpt
1372	\|\| (m_pbCur - m_pOpt->dhcp_len == (uint8_t *)(m_pOpt + 1)));
1373	AssertMsg(cb <= 255, ("%#x\n", cb));
1374
1375	/* Check if we need to overload more stuff. */
1376	if ((uintptr_t)(m_pbEnd - m_pbCur) < cb + 2 + (m_pfOverload ? 1 : 3))
1377	{
1378	m_pOpt = NULL;
1379	if (!overloadMore())
1380	{
1381	m_fOverflowed = true;
1382	AssertMsgFailedReturn(("%u %#x\n", uOption, cb), false);
1383	}
1384	if ((uintptr_t)(m_pbEnd - m_pbCur) < cb + 2 + 1)
1385	{
1386	m_fOverflowed = true;
1387	AssertMsgFailedReturn(("%u %#x\n", uOption, cb), false);
1388	}
1389	}
1390
1391	/* Emit the option header. */
1392	m_pOpt = (PRTNETDHCPOPT)m_pbCur;
1393	m_pOpt->dhcp_opt = uOption;
1394	m_pOpt->dhcp_len = (uint8_t)cb;
1395	m_pbCur += 2;
1396	return true;
1397	}
1398
1399	/**
1400	* Puts option data.
1401	*
1402	* @param pvData The data.
1403	* @param cb The amount to put.
1404	*/
1405	void put(void const *pvData, size_t cb)
1406	{
1407	Assert(m_pOpt \|\| m_fOverflowed);
1408	if (RT_LIKELY(m_pOpt))
1409	{
1410	Assert((uintptr_t)m_pbCur - (uintptr_t)(m_pOpt + 1) + cb <= (size_t)m_pOpt->dhcp_len);
1411	memcpy(m_pbCur, pvData, cb);
1412	m_pbCur += cb;
1413	}
1414	}
1415
1416	/**
1417	* Puts an IPv4 Address.
1418	*
1419	* @param IPv4Addr The address.
1420	*/
1421	void putIPv4Addr(RTNETADDRIPV4 IPv4Addr)
1422	{
1423	put(&IPv4Addr, 4);
1424	}
1425
1426	/**
1427	* Adds an IPv4 address option.
1428	*
1429	* @returns true/false just like begin().
1430	*
1431	* @param uOption The option number.
1432	* @param IPv4Addr The address.
1433	*/
1434	bool optIPv4Addr(uint8_t uOption, RTNETADDRIPV4 IPv4Addr)
1435	{
1436	if (!begin(uOption, 4))
1437	return false;
1438	putIPv4Addr(IPv4Addr);
1439	return true;
1440	}
1441
1442	/**
1443	* Adds an option taking 1 or more IPv4 address.
1444	*
1445	* If the vector contains no addresses, the option will not be added.
1446	*
1447	* @returns true/false just like begin().
1448	*
1449	* @param uOption The option number.
1450	* @param rIPv4Addrs Reference to the address vector.
1451	*/
1452	bool optIPv4Addrs(uint8_t uOption, std::vector<RTNETADDRIPV4> const &rIPv4Addrs)
1453	{
1454	size_t const c = rIPv4Addrs.size();
1455	if (!c)
1456	return true;
1457
1458	if (!begin(uOption, 4*c))
1459	return false;
1460	for (size_t i = 0; i < c; i++)
1461	putIPv4Addr(rIPv4Addrs[i]);
1462	return true;
1463	}
1464
1465	/**
1466	* Puts an 8-bit integer.
1467	*
1468	* @param u8 The integer.
1469	*/
1470	void putU8(uint8_t u8)
1471	{
1472	put(&u8, 1);
1473	}
1474
1475	/**
1476	* Adds an 8-bit integer option.
1477	*
1478	* @returns true/false just like begin().
1479	*
1480	* @param uOption The option number.
1481	* @param u8 The integer
1482	*/
1483	bool optU8(uint8_t uOption, uint8_t u8)
1484	{
1485	if (!begin(uOption, 1))
1486	return false;
1487	putU8(u8);
1488	return true;
1489	}
1490
1491	/**
1492	* Puts an 32-bit integer (network endian).
1493	*
1494	* @param u32Network The integer.
1495	*/
1496	void putU32(uint32_t u32)
1497	{
1498	put(&u32, 4);
1499	}
1500
1501	/**
1502	* Adds an 32-bit integer (network endian) option.
1503	*
1504	* @returns true/false just like begin().
1505	*
1506	* @param uOption The option number.
1507	* @param u32Network The integer.
1508	*/
1509	bool optU32(uint8_t uOption, uint32_t u32)
1510	{
1511	if (!begin(uOption, 4))
1512	return false;
1513	putU32(u32);
1514	return true;
1515	}
1516
1517	/**
1518	* Puts a std::string.
1519	*
1520	* @param rStr Reference to the string.
1521	*/
1522	void putStr(std::string const &rStr)
1523	{
1524	put(rStr.c_str(), rStr.size());
1525	}
1526
1527	/**
1528	* Adds an std::string option if the string isn't empty.
1529	*
1530	* @returns true/false just like begin().
1531	*
1532	* @param uOption The option number.
1533	* @param rStr Reference to the string.
1534	*/
1535	bool optStr(uint8_t uOption, std::string const &rStr)
1536	{
1537	const size_t cch = rStr.size();
1538	if (!cch)
1539	return true;
1540
1541	if (!begin(uOption, cch))
1542	return false;
1543	put(rStr.c_str(), cch);
1544	return true;
1545	}
1546
1547	/**
1548	* Whether we've overflowed.
1549	*
1550	* @returns true on overflow, false otherwise.
1551	*/
1552	bool hasOverflowed(void) const
1553	{
1554	return m_fOverflowed;
1555	}
1556
1557	/**
1558	* Adds the terminating END option.
1559	*
1560	* The END will always be added as we're reserving room for it, however, we
1561	* might've dropped previous options due to overflows and that is what the
1562	* return status indicates.
1563	*
1564	* @returns true on success, false on a (previous) overflow.
1565	*/
1566	bool optEnd(void)
1567	{
1568	Assert((uintptr_t)(m_pbEnd - m_pbCur) < 4096);
1569	*m_pbCur++ = RTNET_DHCP_OPT_END;
1570	return !hasOverflowed();
1571	}
1572	};
1573
1574
1575	/**
1576	* Constructs and sends a reply to a client.
1577	*
1578	* @returns
1579	* @param uMsgType The DHCP message type.
1580	* @param pLease The lease. This can be NULL for some replies.
1581	* @param pDhcpMsg The client message. We will dig out the MAC address,
1582	* transaction ID, and requested options from this.
1583	* @param cb The size of the client message.
1584	*/
1585	void VBoxNetDhcp::makeDhcpReply(uint8_t uMsgType, VBoxNetDhcpLease *pLease, PCRTNETBOOTP pDhcpMsg, size_t cb)
1586	{
1587	size_t cbReply = RTNET_DHCP_NORMAL_SIZE; /** @todo respect the RTNET_DHCP_OPT_MAX_DHCP_MSG_SIZE option */
1588	PRTNETBOOTP pReply = (PRTNETBOOTP)alloca(cbReply);
1589
1590	/*
1591	* The fixed bits stuff.
1592	*/
1593	pReply->bp_op = RTNETBOOTP_OP_REPLY;
1594	pReply->bp_htype = RTNET_ARP_ETHER;
1595	pReply->bp_hlen = sizeof(RTMAC);
1596	pReply->bp_hops = 0;
1597	pReply->bp_xid = pDhcpMsg->bp_xid;
1598	pReply->bp_secs = 0;
1599	pReply->bp_flags = 0; // (pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST); ??
1600	pReply->bp_ciaddr.u = 0;
1601	pReply->bp_yiaddr.u = pLease ? pLease->m_IPv4Address.u : 0xffffffff;
1602	pReply->bp_siaddr.u = pLease && pLease->m_pCfg ? pLease->m_pCfg->m_TftpServerAddr.u : 0; /* (next server == TFTP)*/
1603	pReply->bp_giaddr.u = 0;
1604	memset(&pReply->bp_chaddr, '\0', sizeof(pReply->bp_chaddr));
1605	pReply->bp_chaddr.Mac = pDhcpMsg->bp_chaddr.Mac;
1606	memset(&pReply->bp_sname[0], '\0', sizeof(pReply->bp_sname));
1607	memset(&pReply->bp_file[0], '\0', sizeof(pReply->bp_file));
1608	pReply->bp_vend.Dhcp.dhcp_cookie = RT_H2N_U32_C(RTNET_DHCP_COOKIE);
1609	memset(&pReply->bp_vend.Dhcp.dhcp_opts[0], '\0', RTNET_DHCP_OPT_SIZE);
1610
1611	/*
1612	* The options - use a cursor class for dealing with the ugly stuff.
1613	*/
1614	VBoxNetDhcpWriteCursor Cursor(pReply, cbReply);
1615
1616	/* The basics */
1617	Cursor.optU8(RTNET_DHCP_OPT_MSG_TYPE, uMsgType);
1618	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SERVER_ID, m_Ipv4Address);
1619
1620	if (uMsgType != RTNET_DHCP_MT_NAC)
1621	{
1622	AssertReturnVoid(pLease && pLease->m_pCfg);
1623	const VBoxNetDhcpCfg pCfg = pLease->m_pCfg; / no need to retain it. */
1624
1625	/* The IP config. */
1626	Cursor.optU32(RTNET_DHCP_OPT_LEASE_TIME, RT_H2N_U32(pCfg->m_cSecLease));
1627	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SUBNET_MASK, pCfg->m_SubnetMask);
1628	Cursor.optIPv4Addrs(RTNET_DHCP_OPT_ROUTERS, pCfg->m_Routers);
1629	Cursor.optIPv4Addrs(RTNET_DHCP_OPT_ROUTERS, pCfg->m_DNSes);
1630	Cursor.optStr(RTNET_DHCP_OPT_HOST_NAME, pCfg->m_HostName);
1631	Cursor.optStr(RTNET_DHCP_OPT_DOMAIN_NAME, pCfg->m_DomainName);
1632
1633	/* The PXE config. */
1634	if (pCfg->m_BootfileName.size())
1635	{
1636	if (Cursor.useBpFile())
1637	RTStrPrintf((char *)&pReply->bp_file[0], sizeof(pReply->bp_file), "%s", pCfg->m_BootfileName.c_str());
1638	else
1639	Cursor.optStr(RTNET_DHCP_OPT_BOOTFILE_NAME, pCfg->m_BootfileName);
1640	}
1641	}
1642
1643	/* Terminate the options. */
1644	if (!Cursor.optEnd())
1645	debugPrint(0, true, "option overflow\n");
1646
1647	/*
1648	* Send it.
1649	*/
1650	int rc;
1651	#if 0
1652	if (!(pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST)) /** @todo need to see someone set this flag to check that it's correct. */
1653	{
1654	RTNETADDRIPV4 IPv4AddrBrdCast;
1655	IPv4AddrBrdCast.u = UINT32_C(0xffffffff); /* broadcast IP */
1656	rc = VBoxNetUDPUnicast(m_pSession, m_hIf, m_pIfBuf,
1657	m_Ipv4Address, &m_MacAddress, RTNETIPV4_PORT_BOOTPS, /* sender */
1658	IPv4AddrBrdCast, &pDhcpMsg->bp_chaddr.Mac, RTNETIPV4_PORT_BOOTPC, /* receiver */
1659	pReply, cbReply);
1660	}
1661	else
1662	#endif
1663	rc = VBoxNetUDPBroadcast(m_pSession, m_hIf, m_pIfBuf,
1664	m_Ipv4Address, &m_MacAddress, RTNETIPV4_PORT_BOOTPS, /* sender */
1665	RTNETIPV4_PORT_BOOTPC, /* receiver port */
1666	pReply, cbReply);
1667	if (RT_FAILURE(rc))
1668	debugPrint(0, true, "error %Rrc when sending the reply", rc);
1669	}
1670
1671
1672	/**
1673	* Look up a lease by MAC address.
1674	*
1675	* @returns Pointer to the lease if found, NULL if not found.
1676	* @param pMacAddress The mac address.
1677	* @param fAnyState Any state.
1678	*/
1679	VBoxNetDhcpLease *VBoxNetDhcp::findLeaseByMacAddress(PCRTMAC pMacAddress, bool fAnyState)
1680	{
1681	size_t iLease = m_Leases.size();
1682	while (iLease-- > 0)
1683	{
1684	VBoxNetDhcpLease *pLease = &m_Leases[iLease];
1685	if ( pLease
1686	&& pLease->m_MacAddress.au16[0] == pMacAddress->au16[0]
1687	&& pLease->m_MacAddress.au16[1] == pMacAddress->au16[1]
1688	&& pLease->m_MacAddress.au16[2] == pMacAddress->au16[2]
1689	&& ( fAnyState
1690	\|\| (pLease->m_enmState != VBoxNetDhcpLease::kState_Free)) )
1691	return pLease;
1692	}
1693
1694	return NULL;
1695	}
1696
1697
1698	/**
1699	* Look up a lease by IPv4 and MAC addresses.
1700	*
1701	* @returns Pointer to the lease if found, NULL if not found.
1702	* @param IPv4Addr The IPv4 address.
1703	* @param pMacAddress The mac address.
1704	* @param fAnyState Any state.
1705	*/
1706	VBoxNetDhcpLease *VBoxNetDhcp::findLeaseByIpv4AndMacAddresses(RTNETADDRIPV4 IPv4Addr, PCRTMAC pMacAddress, bool fAnyState)
1707	{
1708	size_t iLease = m_Leases.size();
1709	while (iLease-- > 0)
1710	{
1711	VBoxNetDhcpLease *pLease = &m_Leases[iLease];
1712	if ( pLease
1713	&& pLease->m_IPv4Address.u == IPv4Addr.u
1714	&& pLease->m_MacAddress.au16[0] == pMacAddress->au16[0]
1715	&& pLease->m_MacAddress.au16[1] == pMacAddress->au16[1]
1716	&& pLease->m_MacAddress.au16[2] == pMacAddress->au16[2]
1717	&& ( fAnyState
1718	\|\| (pLease->m_enmState != VBoxNetDhcpLease::kState_Free)) )
1719	return pLease;
1720	}
1721
1722	return NULL;
1723	}
1724
1725
1726	/**
1727	* Creates a new lease for the client specified in the DHCP message.
1728	*
1729	* The caller has already made sure it doesn't already have a lease.
1730	*
1731	* @returns Pointer to the lease if found, NULL+log if not found.
1732	* @param IPv4Addr The IPv4 address.
1733	* @param pMacAddress The MAC address.
1734	*/
1735	VBoxNetDhcpLease *VBoxNetDhcp::newLease(PCRTNETBOOTP pDhcpMsg, size_t cb)
1736	{
1737	RTMAC const MacAddr = pDhcpMsg->bp_chaddr.Mac;
1738	RTTIMESPEC Now;
1739	RTTimeNow(&Now);
1740
1741	/*
1742	* Search the possible leases.
1743	*
1744	* We'll try do all the searches in one pass, that is to say, perfect
1745	* match, old lease, and next free/expired lease.
1746	*/
1747	VBoxNetDhcpLease *pBest = NULL;
1748	VBoxNetDhcpLease *pOld = NULL;
1749	VBoxNetDhcpLease *pFree = NULL;
1750
1751	size_t cLeases = m_Leases.size();
1752	for (size_t i = 0; i < cLeases; i++)
1753	{
1754	VBoxNetDhcpLease *pCur = &m_Leases[i];
1755
1756	/* Skip it if no configuration, that means its not in the current config. */
1757	if (!pCur->m_pCfg)
1758	continue;
1759
1760	/* best */
1761	if ( pCur->isOneSpecificClient()
1762	&& pCur->m_pCfg->matchesMacAddress(&MacAddr))
1763	{
1764	if ( !pBest
1765	\|\| pBest->m_pCfg->m_MacAddresses.size() < pCur->m_pCfg->m_MacAddresses.size())
1766	pBest = pCur;
1767	}
1768
1769	/* old lease */
1770	if ( pCur->m_MacAddress.au16[0] == MacAddr.au16[0]
1771	&& pCur->m_MacAddress.au16[1] == MacAddr.au16[1]
1772	&& pCur->m_MacAddress.au16[2] == MacAddr.au16[2])
1773	{
1774	if ( !pOld
1775	\|\| RTTimeSpecGetSeconds(&pCur->m_ExpireTime) > RTTimeSpecGetSeconds(&pFree->m_ExpireTime))
1776	pOld = pCur;
1777	}
1778
1779	/* expired lease */
1780	if (!pCur->isInUse(&Now))
1781	{
1782	if ( !pFree
1783	\|\| RTTimeSpecGetSeconds(&pCur->m_ExpireTime) < RTTimeSpecGetSeconds(&pFree->m_ExpireTime))
1784	pFree = pCur;
1785	}
1786	}
1787
1788	VBoxNetDhcpLease *pNew = pBest;
1789	if (!pNew)
1790	pNew = pOld;
1791	if (!pNew)
1792	pNew = pFree;
1793	if (!pNew)
1794	{
1795	debugPrint(0, true, "No more leases.");
1796	return NULL;
1797	}
1798
1799	/*
1800	* Init the lease.
1801	*/
1802	pNew->m_MacAddress = MacAddr;
1803	pNew->m_xid = pDhcpMsg->bp_xid;
1804	/** @todo extract the client id. */
1805
1806	return pNew;
1807	}
1808
1809
1810	/**
1811	* Finds an option.
1812	*
1813	* @returns On success, a pointer to the first byte in the option data (no none
1814	* then it'll be the byte following the 0 size field) and *pcbOpt set
1815	* to the option length.
1816	* On failure, NULL is returned and *pcbOpt unchanged.
1817	*
1818	* @param uOption The option to search for.
1819	* @param pDhcpMsg The DHCP message.
1820	* @param cb The size of the message.
1821	* @param pcbOpt Where to store the option size size. Optional. Note
1822	* that this is adjusted if the option length is larger
1823	* than the message buffer.
1824	*/
1825	/* static / const uint8_t
1826	VBoxNetDhcp::findOption(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, size_t *pcbOpt)
1827	{
1828	Assert(uOption != RTNET_DHCP_OPT_PAD);
1829
1830	/*
1831	* Validate the DHCP bits and figure the max size of the options in the vendor field.
1832	*/
1833	if (cb <= RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts))
1834	return NULL;
1835	if (pDhcpMsg->bp_vend.Dhcp.dhcp_cookie != RT_H2N_U32_C(RTNET_DHCP_COOKIE))
1836	return NULL;
1837	size_t cbLeft = cb - RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts);
1838	if (cbLeft > RTNET_DHCP_OPT_SIZE)
1839	cbLeft = RTNET_DHCP_OPT_SIZE;
1840
1841	/*
1842	* Search the vendor field.
1843	*/
1844	bool fExtended = false;
1845	uint8_t const *pb = &pDhcpMsg->bp_vend.Dhcp.dhcp_opts[0];
1846	while (pb && cbLeft > 0)
1847	{
1848	uint8_t uCur = *pb;
1849	if (uCur == RTNET_DHCP_OPT_PAD)
1850	{
1851	cbLeft--;
1852	pb++;
1853	}
1854	else if (cbLeft <= 1)
1855	break;
1856	else
1857	{
1858	size_t cbCur = pb[1];
1859	if (cbCur > cbLeft - 2)
1860	cbCur = cbLeft - 2;
1861	if (uCur == uOption)
1862	{
1863	if (pcbOpt)
1864	*pcbOpt = cbCur;
1865	return pb+2;
1866	}
1867	pb += cbCur + 2;
1868	cbLeft -= cbCur - 2;
1869	}
1870	}
1871
1872	/** @todo search extended dhcp option field(s) when present */
1873
1874	return NULL;
1875	}
1876
1877
1878	/**
1879	* Locates an option with an IPv4 address in the DHCP message.
1880	*
1881	* @returns true and *pIpv4Addr if found, false if not.
1882	*
1883	* @param uOption The option to find.
1884	* @param pDhcpMsg The DHCP message.
1885	* @param cb The size of the message.
1886	* @param pIPv4Addr Where to put the address.
1887	*/
1888	/* static */ bool
1889	VBoxNetDhcp::findOptionIPv4Addr(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, PRTNETADDRIPV4 pIPv4Addr)
1890	{
1891	size_t cbOpt;
1892	uint8_t const *pbOpt = findOption(uOption, pDhcpMsg, cb, &cbOpt);
1893	if (pbOpt)
1894	{
1895	if (cbOpt >= sizeof(RTNETADDRIPV4))
1896	{
1897	pIPv4Addr = (PCRTNETADDRIPV4)pbOpt;
1898	return true;
1899	}
1900	}
1901	return false;
1902	}
1903
1904
1905	/**
1906	* Print debug message depending on the m_cVerbosity level.
1907	*
1908	* @param iMinLevel The minimum m_cVerbosity level for this message.
1909	* @param fMsg Whether to dump parts for the current DHCP message.
1910	* @param pszFmt The message format string.
1911	* @param ... Optional arguments.
1912	*/
1913	inline void VBoxNetDhcp::debugPrint(int32_t iMinLevel, bool fMsg, const char *pszFmt, ...) const
1914	{
1915	if (iMinLevel <= m_cVerbosity)
1916	{
1917	va_list va;
1918	va_start(va, pszFmt);
1919	debugPrintV(iMinLevel, fMsg, pszFmt, va);
1920	va_end(va);
1921	}
1922	}
1923
1924
1925	/**
1926	* Print debug message depending on the m_cVerbosity level.
1927	*
1928	* @param iMinLevel The minimum m_cVerbosity level for this message.
1929	* @param fMsg Whether to dump parts for the current DHCP message.
1930	* @param pszFmt The message format string.
1931	* @param va Optional arguments.
1932	*/
1933	void VBoxNetDhcp::debugPrintV(int iMinLevel, bool fMsg, const char *pszFmt, va_list va) const
1934	{
1935	if (iMinLevel <= m_cVerbosity)
1936	{
1937	va_list vaCopy; /* This dude is very special, thus the copy. */
1938	va_copy(vaCopy, va);
1939	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: %s: %N\n", iMinLevel >= 2 ? "debug" : "info", pszFmt, &vaCopy);
1940	va_end(vaCopy);
1941
1942	if ( fMsg
1943	&& m_cVerbosity >= 2
1944	&& m_pCurMsg)
1945	{
1946	const char *pszMsg = m_uCurMsgType != UINT8_MAX ? debugDhcpName(m_uCurMsgType) : "";
1947	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",
1948	pszMsg,
1949	&m_pCurMsg->bp_chaddr,
1950	m_pCurMsg->bp_ciaddr.au8[0], m_pCurMsg->bp_ciaddr.au8[1], m_pCurMsg->bp_ciaddr.au8[2], m_pCurMsg->bp_ciaddr.au8[3],
1951	m_pCurMsg->bp_yiaddr.au8[0], m_pCurMsg->bp_yiaddr.au8[1], m_pCurMsg->bp_yiaddr.au8[2], m_pCurMsg->bp_yiaddr.au8[3],
1952	m_pCurMsg->bp_siaddr.au8[0], m_pCurMsg->bp_siaddr.au8[1], m_pCurMsg->bp_siaddr.au8[2], m_pCurMsg->bp_siaddr.au8[3],
1953	m_pCurMsg->bp_xid);
1954	}
1955	}
1956	}
1957
1958
1959	/**
1960	* Gets the name of given DHCP message type.
1961	*
1962	* @returns Readonly name.
1963	* @param uMsgType The message number.
1964	*/
1965	/* static / const char VBoxNetDhcp::debugDhcpName(uint8_t uMsgType)
1966	{
1967	switch (uMsgType)
1968	{
1969	case 0: return "MT_00";
1970	case RTNET_DHCP_MT_DISCOVER: return "DISCOVER";
1971	case RTNET_DHCP_MT_OFFER: return "OFFER";
1972	case RTNET_DHCP_MT_REQUEST: return "REQUEST";
1973	case RTNET_DHCP_MT_DECLINE: return "DECLINE";
1974	case RTNET_DHCP_MT_ACK: return "ACK";
1975	case RTNET_DHCP_MT_NAC: return "NAC";
1976	case RTNET_DHCP_MT_RELEASE: return "RELEASE";
1977	case RTNET_DHCP_MT_INFORM: return "INFORM";
1978	case 9: return "MT_09";
1979	case 10: return "MT_0a";
1980	case 11: return "MT_0b";
1981	case 12: return "MT_0c";
1982	case 13: return "MT_0d";
1983	case 14: return "MT_0e";
1984	case 15: return "MT_0f";
1985	case 16: return "MT_10";
1986	case 17: return "MT_11";
1987	case 18: return "MT_12";
1988	case 19: return "MT_13";
1989	case UINT8_MAX: return "MT_ff";
1990	default: return "UNKNOWN";
1991	}
1992	}
1993
1994
1995
1996	/**
1997	* Entry point.
1998	*/
1999	extern "C" DECLEXPORT(int) TrustedMain(int argc, char argv, char envp)
2000	{
2001	/*
2002	* Instantiate the DHCP server and hand it the options.
2003	*/
2004	VBoxNetDhcp *pDhcp = new VBoxNetDhcp();
2005	if (!pDhcp)
2006	{
2007	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: new VBoxNetDhcp failed!\n");
2008	return 1;
2009	}
2010	int rc = pDhcp->parseArgs(argc - 1, argv + 1);
2011	if (rc)
2012	return rc;
2013
2014	/*
2015	* Try connect the server to the network.
2016	*/
2017	rc = pDhcp->tryGoOnline();
2018	if (rc)
2019	{
2020	delete pDhcp;
2021	return rc;
2022	}
2023
2024	/*
2025	* Process requests.
2026	*/
2027	g_pDhcp = pDhcp;
2028	rc = pDhcp->run();
2029	g_pDhcp = NULL;
2030	delete pDhcp;
2031
2032	return rc;
2033	}
2034
2035
2036	#ifndef VBOX_WITH_HARDENING
2037
2038	int main(int argc, char argv, char envp)
2039	{
2040	int rc = RTR3InitAndSUPLib();
2041	if (RT_FAILURE(rc))
2042	{
2043	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: RTR3InitAndSupLib failed, rc=%Rrc\n", rc);
2044	return 1;
2045	}
2046
2047	return TrustedMain(argc, argv, envp);
2048	}
2049
2050	# ifdef RT_OS_WINDOWS
2051
2052	static LRESULT CALLBACK WindowProc(HWND hwnd,
2053	UINT uMsg,
2054	WPARAM wParam,
2055	LPARAM lParam
2056	)
2057	{
2058	if(uMsg == WM_DESTROY)
2059	{
2060	PostQuitMessage(0);
2061	return 0;
2062	}
2063	return DefWindowProc (hwnd, uMsg, wParam, lParam);
2064	}
2065
2066	static LPCSTR g_WndClassName = "VBoxNetDHCPClass";
2067
2068	static DWORD WINAPI MsgThreadProc(__in LPVOID lpParameter)
2069	{
2070	HWND hwnd = 0;
2071	HINSTANCE hInstance = (HINSTANCE)GetModuleHandle (NULL);
2072	bool bExit = false;
2073
2074	/* Register the Window Class. */
2075	WNDCLASS wc;
2076	wc.style = 0;
2077	wc.lpfnWndProc = WindowProc;
2078	wc.cbClsExtra = 0;
2079	wc.cbWndExtra = sizeof(void *);
2080	wc.hInstance = hInstance;
2081	wc.hIcon = NULL;
2082	wc.hCursor = NULL;
2083	wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
2084	wc.lpszMenuName = NULL;
2085	wc.lpszClassName = g_WndClassName;
2086
2087	ATOM atomWindowClass = RegisterClass(&wc);
2088
2089	if (atomWindowClass != 0)
2090	{
2091	/* Create the window. */
2092	hwnd = CreateWindowEx (WS_EX_TOOLWINDOW \| WS_EX_TRANSPARENT \| WS_EX_TOPMOST,
2093	g_WndClassName, g_WndClassName,
2094	WS_POPUPWINDOW,
2095	-200, -200, 100, 100, NULL, NULL, hInstance, NULL);
2096
2097	if (hwnd)
2098	{
2099	SetWindowPos(hwnd, HWND_TOPMOST, -200, -200, 0, 0,
2100	SWP_NOACTIVATE \| SWP_HIDEWINDOW \| SWP_NOCOPYBITS \| SWP_NOREDRAW \| SWP_NOSIZE);
2101
2102	MSG msg;
2103	while (GetMessage(&msg, NULL, 0, 0))
2104	{
2105	TranslateMessage(&msg);
2106	DispatchMessage(&msg);
2107	}
2108
2109	DestroyWindow (hwnd);
2110
2111	bExit = true;
2112	}
2113
2114	UnregisterClass (g_WndClassName, hInstance);
2115	}
2116
2117	if(bExit)
2118	{
2119	/* no need any accuracy here, in anyway the DHCP server usually gets terminated with TerminateProcess */
2120	exit(0);
2121	}
2122
2123	return 0;
2124	}
2125
2126
2127	/** (We don't want a console usually.) */
2128	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
2129	{
2130	NOREF(hInstance); NOREF(hPrevInstance); NOREF(lpCmdLine); NOREF(nCmdShow);
2131
2132	HANDLE hThread = CreateThread(
2133	NULL, /__in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes, /
2134	0, /__in SIZE_T dwStackSize, /
2135	MsgThreadProc, /__in LPTHREAD_START_ROUTINE lpStartAddress,/
2136	NULL, /__in_opt LPVOID lpParameter,/
2137	0, /__in DWORD dwCreationFlags,/
2138	NULL /__out_opt LPDWORD lpThreadId/
2139	);
2140
2141	if(hThread != NULL)
2142	CloseHandle(hThread);
2143
2144	return main(__argc, __argv, environ);
2145	}
2146	# endif /* RT_OS_WINDOWS */
2147
2148	#endif /* !VBOX_WITH_HARDENING */
2149

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source: vbox/trunk/src/VBox/NetworkServices/DHCP/VBoxNetDHCP.cpp@ 29132

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