VBoxNetDHCP.cpp@ 19255

Last change on this file since 19255 was 19255, checked in by vboxsync, 16 years ago
Backed out 46655-57 for now
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1	/* $Id: VBoxNetDHCP.cpp 19255 2009-04-29 10:14:59Z 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/net.h>
32	#include <iprt/initterm.h>
33	#include <iprt/alloca.h>
34	#include <iprt/err.h>
35	#include <iprt/time.h>
36	#include <iprt/stream.h>
37	#include <iprt/path.h>
38	#include <iprt/param.h>
39	#include <iprt/getopt.h>
40	#include <iprt/string.h>
41
42	#include <VBox/sup.h>
43	#include <VBox/intnet.h>
44	#include <VBox/vmm.h>
45	#include <VBox/version.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 = SUPCallVMMR0Ex(NIL_RTR0PTR, VMMR0_DO_INTNET_IF_CLOSE, 0, &CloseReq.Hdr);
580	AssertRC(rc);
581	}
582
583	if (m_pSession)
584	{
585	SUPTerm(false /* not forced */);
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 uEnd = RT_N2H_U32(pCfg->m_UpperAddr.u);
655	for (uint32_t i = RT_N2H_U32(pCfg->m_LowerAddr.u); i < uEnd; 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 i = 0; i < m_Leases.size(); i++)
663	if (m_Leases[i].m_IPv4Address.u == IPv4Addr.u)
664	{
665	pLease = &m_Leases[i];
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	{ "--help", 'h', RTGETOPT_REQ_NOTHING },
714	{ "--version ", 'V', RTGETOPT_REQ_NOTHING },
715	};
716
717	RTGETOPTSTATE State;
718	int rc = RTGetOptInit(&State, argc, argv, &s_aOptionDefs[0], RT_ELEMENTS(s_aOptionDefs), 0, 0);
719	AssertRCReturn(rc, 49);
720
721	VBoxNetDhcpCfg *pCurCfg = NULL;
722	for (;;)
723	{
724	RTGETOPTUNION Val;
725	rc = RTGetOpt(&State, &Val);
726	if (!rc)
727	break;
728	switch (rc)
729	{
730	case 'N':
731	m_Name = Val.psz;
732	break;
733	case 'n':
734	m_Network = Val.psz;
735	break;
736	case 't':
737	m_TrunkName = Val.psz;
738	break;
739	case 'T':
740	if (!strcmp(Val.psz, "none"))
741	m_enmTrunkType = kIntNetTrunkType_None;
742	else if (!strcmp(Val.psz, "whatever"))
743	m_enmTrunkType = kIntNetTrunkType_WhateverNone;
744	else if (!strcmp(Val.psz, "netflt"))
745	m_enmTrunkType = kIntNetTrunkType_NetFlt;
746	else if (!strcmp(Val.psz, "netadp"))
747	m_enmTrunkType = kIntNetTrunkType_NetAdp;
748	else if (!strcmp(Val.psz, "srvnat"))
749	m_enmTrunkType = kIntNetTrunkType_SrvNat;
750	else
751	{
752	RTStrmPrintf(g_pStdErr, "Invalid trunk type '%s'\n", Val.psz);
753	return 1;
754	}
755	break;
756	case 'a':
757	m_MacAddress = Val.MacAddr;
758	break;
759	case 'i':
760	m_Ipv4Address = Val.IPv4Addr;
761	break;
762	case 'd':
763	m_LeaseDBName = Val.psz;
764	break;
765
766	case 'v':
767	m_cVerbosity++;
768	break;
769
770	/* Begin config. */
771	case 'b':
772	rc = addConfig(pCurCfg);
773	if (rc)
774	break;
775	pCurCfg = NULL;
776	/* fall thru */
777
778	/* config specific ones. */
779	case 'g':
780	case 'l':
781	case 'u':
782	case 'm':
783	if (!pCurCfg)
784	{
785	pCurCfg = new VBoxNetDhcpCfg();
786	if (!pCurCfg)
787	{
788	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: new VBoxDhcpCfg failed\n");
789	return 1;
790	}
791	}
792
793	switch (rc)
794	{
795	case 'g':
796	pCurCfg->m_Routers.push_back(Val.IPv4Addr);
797	break;
798
799	case 'l':
800	pCurCfg->m_LowerAddr = Val.IPv4Addr;
801	break;
802
803	case 'u':
804	pCurCfg->m_UpperAddr = Val.IPv4Addr;
805	break;
806
807	case 'm':
808	pCurCfg->m_SubnetMask = Val.IPv4Addr;
809	break;
810
811	case 0: /* ignore */ break;
812	default:
813	AssertMsgFailed(("%d", rc));
814	return 1;
815	}
816	break;
817
818	case 'V':
819	RTPrintf("%sr%d\n", VBOX_VERSION_STRING, VBOX_SVN_REV);
820	return 0;
821
822	case 'h':
823	RTPrintf("VBoxNetDHCP Version %s\n"
824	"(C) 2009 Sun Microsystems, Inc.\n"
825	"All rights reserved\n"
826	"\n"
827	"Usage: VBoxNetDHCP <options>\n"
828	"\n"
829	"Options:\n",
830	VBOX_VERSION_STRING);
831	for (size_t i = 0; i < RT_ELEMENTS(s_aOptionDefs); i++)
832	RTPrintf(" -%c, %s\n", s_aOptionDefs[i].iShort, s_aOptionDefs[i].pszLong);
833	return 1;
834
835	case VERR_GETOPT_UNKNOWN_OPTION:
836	case VINF_GETOPT_NOT_OPTION:
837	RTPrintf("Unknown option '%s'. Use --help for more information.\n", Val.psz);
838	return 1;
839
840	default:
841	break;
842	}
843	}
844
845	/*
846	* Do the reconfig. (move this later)
847	*/
848	if (!rc)
849	explodeConfig();
850
851	return rc;
852	}
853
854
855	/**
856	* Tries to connect to the internal network.
857	*
858	* @returns 0 on success, exit code + error message to stderr on failure.
859	*/
860	int VBoxNetDhcp::tryGoOnline(void)
861	{
862	/*
863	* Open the session, load ring-0 and issue the request.
864	*/
865	int rc = SUPR3Init(&m_pSession);
866	if (RT_FAILURE(rc))
867	{
868	m_pSession = NIL_RTR0PTR;
869	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPR3Init -> %Rrc", rc);
870	return 1;
871	}
872
873	char szPath[RTPATH_MAX];
874	rc = RTPathProgram(szPath, sizeof(szPath) - sizeof("/VMMR0.r0"));
875	if (RT_FAILURE(rc))
876	{
877	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: RTPathProgram -> %Rrc", rc);
878	return 1;
879	}
880
881	rc = SUPLoadVMM(strcat(szPath, "/VMMR0.r0"));
882	if (RT_FAILURE(rc))
883	{
884	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPLoadVMM(\"%s\") -> %Rrc", szPath, rc);
885	return 1;
886	}
887
888	/*
889	* Create the open request.
890	*/
891	INTNETOPENREQ OpenReq;
892	OpenReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
893	OpenReq.Hdr.cbReq = sizeof(OpenReq);
894	OpenReq.pSession = m_pSession;
895	strncpy(OpenReq.szNetwork, m_Network.c_str(), sizeof(OpenReq.szNetwork));
896	OpenReq.szNetwork[sizeof(OpenReq.szNetwork) - 1] = '\0';
897	strncpy(OpenReq.szTrunk, m_TrunkName.c_str(), sizeof(OpenReq.szTrunk));
898	OpenReq.szTrunk[sizeof(OpenReq.szTrunk) - 1] = '\0';
899	OpenReq.enmTrunkType = m_enmTrunkType;
900	OpenReq.fFlags = 0; /** @todo check this */
901	OpenReq.cbSend = m_cbSendBuf;
902	OpenReq.cbRecv = m_cbRecvBuf;
903	OpenReq.hIf = INTNET_HANDLE_INVALID;
904
905	/*
906	* Issue the request.
907	*/
908	debugPrint(2, false, "attempting to open/create network \"%s\"...", OpenReq.szNetwork);
909	rc = SUPCallVMMR0Ex(NIL_RTR0PTR, VMMR0_DO_INTNET_OPEN, 0, &OpenReq.Hdr);
910	if (RT_SUCCESS(rc))
911	{
912	m_hIf = OpenReq.hIf;
913	debugPrint(1, false, "successfully opened/created \"%s\" - hIf=%#x", OpenReq.szNetwork, m_hIf);
914
915	/*
916	* Get the ring-3 address of the shared interface buffer.
917	*/
918	INTNETIFGETRING3BUFFERREQ GetRing3BufferReq;
919	GetRing3BufferReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
920	GetRing3BufferReq.Hdr.cbReq = sizeof(GetRing3BufferReq);
921	GetRing3BufferReq.pSession = m_pSession;
922	GetRing3BufferReq.hIf = m_hIf;
923	GetRing3BufferReq.pRing3Buf = NULL;
924	rc = SUPCallVMMR0Ex(NIL_RTR0PTR, VMMR0_DO_INTNET_IF_GET_RING3_BUFFER, 0, &GetRing3BufferReq.Hdr);
925	if (RT_SUCCESS(rc))
926	{
927	PINTNETBUF pBuf = GetRing3BufferReq.pRing3Buf;
928	debugPrint(1, false, "pBuf=%p cbBuf=%d cbSend=%d cbRecv=%d",
929	pBuf, pBuf->cbBuf, pBuf->cbSend, pBuf->cbRecv);
930	m_pIfBuf = pBuf;
931
932	/*
933	* Activate the interface.
934	*/
935	INTNETIFSETACTIVEREQ ActiveReq;
936	ActiveReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
937	ActiveReq.Hdr.cbReq = sizeof(ActiveReq);
938	ActiveReq.pSession = m_pSession;
939	ActiveReq.hIf = m_hIf;
940	ActiveReq.fActive = true;
941	rc = SUPCallVMMR0Ex(NIL_RTR0PTR, VMMR0_DO_INTNET_IF_SET_ACTIVE, 0, &ActiveReq.Hdr);
942	if (RT_SUCCESS(rc))
943	return 0;
944
945	/* bail out */
946	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPCallVMMR0Ex(,VMMR0_DO_INTNET_IF_SET_PROMISCUOUS_MODE,) failed, rc=%Rrc\n", rc);
947	}
948	else
949	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPCallVMMR0Ex(,VMMR0_DO_INTNET_IF_GET_RING3_BUFFER,) failed, rc=%Rrc\n", rc);
950	}
951	else
952	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: SUPCallVMMR0Ex(,VMMR0_DO_INTNET_OPEN,) failed, rc=%Rrc\n", rc);
953
954	return RT_SUCCESS(rc) ? 0 : 1;
955	}
956
957
958	/**
959	* Runs the DHCP server.
960	*
961	* @returns exit code + error message to stderr on failure, won't return on
962	* success (you must kill this process).
963	*/
964	int VBoxNetDhcp::run(void)
965	{
966	/*
967	* The loop.
968	*/
969	PINTNETRINGBUF pRingBuf = &m_pIfBuf->Recv;
970	for (;;)
971	{
972	/*
973	* Wait for a packet to become available.
974	*/
975	INTNETIFWAITREQ WaitReq;
976	WaitReq.Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
977	WaitReq.Hdr.cbReq = sizeof(WaitReq);
978	WaitReq.pSession = m_pSession;
979	WaitReq.hIf = m_hIf;
980	WaitReq.cMillies = 2000; /* 2 secs - the sleep is for some reason uninterruptible... / /* @todo fix interruptability in SrvIntNet! */
981	int rc = SUPCallVMMR0Ex(NIL_RTR0PTR, VMMR0_DO_INTNET_IF_WAIT, 0, &WaitReq.Hdr);
982	if (RT_FAILURE(rc))
983	{
984	if (rc == VERR_TIMEOUT)
985	continue;
986	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: VMMR0_DO_INTNET_IF_WAIT returned %Rrc\n", rc);
987	return 1;
988	}
989
990	/*
991	* Process the receive buffer.
992	*/
993	while (INTNETRingGetReadable(pRingBuf) > 0)
994	{
995	size_t cb;
996	void *pv = VBoxNetUDPMatch(m_pIfBuf, RTNETIPV4_PORT_BOOTPS, &m_MacAddress,
997	VBOXNETUDP_MATCH_UNICAST \| VBOXNETUDP_MATCH_BROADCAST \| VBOXNETUDP_MATCH_CHECKSUM
998	\| (m_cVerbosity > 2 ? VBOXNETUDP_MATCH_PRINT_STDERR : 0),
999	&m_CurHdrs, &cb);
1000	if (pv && cb)
1001	{
1002	PCRTNETBOOTP pDhcpMsg = (PCRTNETBOOTP)pv;
1003	m_pCurMsg = pDhcpMsg;
1004	m_cbCurMsg = cb;
1005
1006	uint8_t uMsgType;
1007	if (RTNetIPv4IsDHCPValid(NULL /* why is this here? */, pDhcpMsg, cb, &uMsgType))
1008	{
1009	m_uCurMsgType = uMsgType;
1010	handleDhcpMsg(uMsgType, pDhcpMsg, cb);
1011	m_uCurMsgType = UINT8_MAX;
1012	}
1013	else
1014	debugPrint(1, true, "VBoxNetDHCP: Skipping invalid DHCP packet.\n"); /** @todo handle pure bootp clients too? */
1015
1016	m_pCurMsg = NULL;
1017	m_cbCurMsg = 0;
1018	}
1019	else if (VBoxNetArpHandleIt(m_pSession, m_hIf, m_pIfBuf, &m_MacAddress, m_Ipv4Address))
1020	{
1021	/* nothing */
1022	}
1023
1024	/* Advance to the next frame. */
1025	INTNETRingSkipFrame(m_pIfBuf, pRingBuf);
1026	}
1027	}
1028
1029	return 0;
1030	}
1031
1032
1033	/**
1034	* Handles a DHCP message.
1035	*
1036	* @returns true if handled, false if not.
1037	* @param uMsgType The message type.
1038	* @param pDhcpMsg The DHCP message.
1039	* @param cb The size of the DHCP message.
1040	*/
1041	bool VBoxNetDhcp::handleDhcpMsg(uint8_t uMsgType, PCRTNETBOOTP pDhcpMsg, size_t cb)
1042	{
1043	if (pDhcpMsg->bp_op == RTNETBOOTP_OP_REQUEST)
1044	{
1045	switch (uMsgType)
1046	{
1047	case RTNET_DHCP_MT_DISCOVER:
1048	return handleDhcpReqDiscover(pDhcpMsg, cb);
1049
1050	case RTNET_DHCP_MT_REQUEST:
1051	return handleDhcpReqRequest(pDhcpMsg, cb);
1052
1053	case RTNET_DHCP_MT_DECLINE:
1054	return handleDhcpReqDecline(pDhcpMsg, cb);
1055
1056	case RTNET_DHCP_MT_RELEASE:
1057	return handleDhcpReqRelease(pDhcpMsg, cb);
1058
1059	case RTNET_DHCP_MT_INFORM:
1060	debugPrint(0, true, "Should we handle this?");
1061	break;
1062
1063	default:
1064	debugPrint(0, true, "Unexpected.");
1065	break;
1066	}
1067	}
1068	return false;
1069	}
1070
1071
1072	/**
1073	* The client is requesting an offer.
1074	*
1075	* @returns true.
1076	*
1077	* @param pDhcpMsg The message.
1078	* @param cb The message size.
1079	*/
1080	bool VBoxNetDhcp::handleDhcpReqDiscover(PCRTNETBOOTP pDhcpMsg, size_t cb)
1081	{
1082	/*
1083	* The newLease() method contains logic for finding current leases
1084	* and reusing them in case the client is forgetful.
1085	*/
1086	VBoxNetDhcpLease *pLease = newLease(pDhcpMsg, cb);
1087	if (!pLease)
1088	return false;
1089	debugPrint(1, true, "Offering %d.%d.%d.%d to %.6Rhxs xid=%#x",
1090	pLease->m_IPv4Address.au8[0],
1091	pLease->m_IPv4Address.au8[1],
1092	pLease->m_IPv4Address.au8[2],
1093	pLease->m_IPv4Address.au8[3],
1094	&pDhcpMsg->bp_chaddr.Mac,
1095	pDhcpMsg->bp_xid);
1096	pLease->offer(pDhcpMsg->bp_xid);
1097
1098	makeDhcpReply(RTNET_DHCP_MT_OFFER, pLease, pDhcpMsg, cb);
1099	return true;
1100	}
1101
1102
1103	/**
1104	* The client is requesting an offer.
1105	*
1106	* @returns true.
1107	*
1108	* @param pDhcpMsg The message.
1109	* @param cb The message size.
1110	*/
1111	bool VBoxNetDhcp::handleDhcpReqRequest(PCRTNETBOOTP pDhcpMsg, size_t cb)
1112	{
1113	/** @todo Probably need to match the server IP here to work correctly with
1114	* other servers. */
1115	/** @todo This code isn't entirely correct and quite a bit of a hack, but it
1116	* will have to do for now as the right thing (tm) is very complex.
1117	* Part of the fun is verifying that the request is something we can
1118	* and should handle. */
1119
1120	/*
1121	* Try find the lease by the requested address + client MAC address.
1122	*/
1123	VBoxNetDhcpLease *pLease = NULL;
1124	RTNETADDRIPV4 IPv4Addr;
1125	bool fReqAddr = findOptionIPv4Addr(RTNET_DHCP_OPT_REQ_ADDR, pDhcpMsg, cb, &IPv4Addr);
1126	if (fReqAddr)
1127	{
1128	fReqAddr = true;
1129	pLease = findLeaseByIpv4AndMacAddresses(IPv4Addr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1130	}
1131
1132	/*
1133	* Try find the lease by the client IP address + client MAC address.
1134	*/
1135	if ( !pLease
1136	&& pDhcpMsg->bp_ciaddr.u)
1137	pLease = findLeaseByIpv4AndMacAddresses(pDhcpMsg->bp_ciaddr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1138
1139	#if 0 /** @todo client id stuff - it doesn't make sense here imho, we need IP + MAC. What would make sense
1140	though is to compare the client id with what we've got in the lease and use it to root out
1141	bad requests. */
1142	/*
1143	* Try find the lease by using the client id.
1144	*/
1145	if (!pLease)
1146	{
1147	size_t cbClientID = 0;
1148	uint8_t const *pbClientID = findOption(RTNET_DHCP_OPT_CLIENT_ID, pDhcpMsg, cb, &cbClientID);
1149	if ( pbClientID
1150	&& cbClientID == sizeof(RTMAC) + 1
1151	&& pbClientID[0] == RTNET_ARP_ETHER
1152	&&
1153	)
1154	{
1155	pLease = findLeaseByIpv4AndMacAddresses(pDhcpMsg->bp_ciaddr, &pDhcpMsg->bp_chaddr.Mac, true /* fAnyState */);
1156	}
1157	}
1158	#endif
1159
1160	/*
1161	* Validate the lease that's requested.
1162	* We've already check the MAC and IP addresses.
1163	*/
1164	bool fAckIt = false;
1165	if (pLease)
1166	{
1167	if (pLease->isBeingOffered())
1168	{
1169	fAckIt = true;
1170	if (pLease->m_xid == pDhcpMsg->bp_xid)
1171	debugPrint(2, true, "REQUEST for offered lease.");
1172	else
1173	debugPrint(2, true, "REQUEST for offered lease, xid mismatch. Expected %#x, got %#x.",
1174	pLease->m_xid, pDhcpMsg->bp_xid);
1175	pLease->m_xid = pDhcpMsg->bp_xid; /* update xid */
1176	pLease->activate();
1177	}
1178	else if (!pLease->isInCurrentConfig())
1179	debugPrint(1, true, "REQUEST for obsolete lease -> NAK");
1180	else if (fReqAddr != (pDhcpMsg->bp_ciaddr.u != 0)) // ???
1181	{
1182	/** @todo this ain't safe. */
1183	debugPrint(1, true, "REQUEST for lease not on offer, assuming renewal. lease_xid=%#x bp_xid=%#x",
1184	pLease->m_xid, pDhcpMsg->bp_xid);
1185	fAckIt = true;
1186	pLease->activate(pDhcpMsg->bp_xid);
1187	}
1188	else
1189	debugPrint(1, true, "REQUEST for lease not on offer, NAK it.");
1190	}
1191
1192	/*
1193	* NAK if if no lease was found.
1194	*/
1195	if (fAckIt)
1196	{
1197	debugPrint(1, false, "ACK'ing DHCP_REQUEST");
1198	makeDhcpReply(RTNET_DHCP_MT_ACK, pLease, pDhcpMsg, cb);
1199	}
1200	else
1201	{
1202	debugPrint(1, false, "NAK'ing DHCP_REQUEST");
1203	makeDhcpReply(RTNET_DHCP_MT_NAC, NULL, pDhcpMsg, cb);
1204	}
1205
1206	return true;
1207	}
1208
1209
1210	/**
1211	* The client is declining an offer we've made.
1212	*
1213	* @returns true.
1214	*
1215	* @param pDhcpMsg The message.
1216	* @param cb The message size.
1217	*/
1218	bool VBoxNetDhcp::handleDhcpReqDecline(PCRTNETBOOTP pDhcpMsg, size_t cb)
1219	{
1220	/** @todo Probably need to match the server IP here to work correctly with
1221	* other servers. */
1222
1223	/*
1224	* The client is supposed to pass us option 50, requested address,
1225	* from the offer. We also match the lease state. Apparently the
1226	* MAC address is not supposed to be checked here.
1227	*/
1228
1229	/** @todo this is not required in the initial implementation, do it later. */
1230	debugPrint(1, true, "DECLINE is not implemented");
1231	return true;
1232	}
1233
1234
1235	/**
1236	* The client is releasing its lease - good boy.
1237	*
1238	* @returns true.
1239	*
1240	* @param pDhcpMsg The message.
1241	* @param cb The message size.
1242	*/
1243	bool VBoxNetDhcp::handleDhcpReqRelease(PCRTNETBOOTP pDhcpMsg, size_t cb)
1244	{
1245	/** @todo Probably need to match the server IP here to work correctly with
1246	* other servers. */
1247
1248	/*
1249	* The client may pass us option 61, client identifier, which we should
1250	* use to find the lease by.
1251	*
1252	* We're matching MAC address and lease state as well.
1253	*/
1254
1255	/*
1256	* If no client identifier or if we couldn't find a lease by using it,
1257	* we will try look it up by the client IP address.
1258	*/
1259
1260
1261	/*
1262	* If found, release it.
1263	*/
1264
1265
1266	/** @todo this is not required in the initial implementation, do it later. */
1267	debugPrint(1, true, "RELEASE is not implemented");
1268	return true;
1269	}
1270
1271
1272	/**
1273	* Helper class for stuffing DHCP options into a reply packet.
1274	*/
1275	class VBoxNetDhcpWriteCursor
1276	{
1277	private:
1278	uint8_t m_pbCur; /< The current cursor position. /
1279	uint8_t m_pbEnd; /< The end the current option space. /
1280	uint8_t m_pfOverload; /< Pointer to the flags of the overload option. /
1281	uint8_t m_fUsed; /*< Overload fields that have been used. /
1282	PRTNETDHCPOPT m_pOpt; /*< The current option. /
1283	PRTNETBOOTP m_pDhcp; /*< The DHCP packet. /
1284	bool m_fOverflowed; /*< Set if we've overflowed, otherwise false. /
1285
1286	public:
1287	/** Instantiate an option cursor for the specified DHCP message. */
1288	VBoxNetDhcpWriteCursor(PRTNETBOOTP pDhcp, size_t cbDhcp) :
1289	m_pbCur(&pDhcp->bp_vend.Dhcp.dhcp_opts[0]),
1290	m_pbEnd((uint8_t *)pDhcp + cbDhcp),
1291	m_pfOverload(NULL),
1292	m_fUsed(0),
1293	m_pOpt(NULL),
1294	m_pDhcp(pDhcp),
1295	m_fOverflowed(false)
1296	{
1297	AssertPtr(pDhcp);
1298	Assert(cbDhcp > RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts[10]));
1299	}
1300
1301	/** Destructor. */
1302	~VBoxNetDhcpWriteCursor()
1303	{
1304	m_pbCur = m_pbEnd = m_pfOverload = NULL;
1305	m_pOpt = NULL;
1306	m_pDhcp = NULL;
1307	}
1308
1309	/**
1310	* Try use the bp_file field.
1311	* @returns true if not overloaded, false otherwise.
1312	*/
1313	bool useBpFile(void)
1314	{
1315	if ( m_pfOverload
1316	&& (*m_pfOverload & 1))
1317	return false;
1318	m_fUsed \|= 1 /* bp_file flag*/;
1319	return true;
1320	}
1321
1322
1323	/**
1324	* Try overload more BOOTP fields
1325	*/
1326	bool overloadMore(void)
1327	{
1328	/* switch option area. */
1329	uint8_t *pbNew;
1330	uint8_t *pbNewEnd;
1331	uint8_t fField;
1332	if (!(m_fUsed & 1))
1333	{
1334	fField = 1;
1335	pbNew = &m_pDhcp->bp_file[0];
1336	pbNewEnd = &m_pDhcp->bp_file[sizeof(m_pDhcp->bp_file)];
1337	}
1338	else if (!(m_fUsed & 2))
1339	{
1340	fField = 2;
1341	pbNew = &m_pDhcp->bp_sname[0];
1342	pbNewEnd = &m_pDhcp->bp_sname[sizeof(m_pDhcp->bp_sname)];
1343	}
1344	else
1345	return false;
1346
1347	if (!m_pfOverload)
1348	{
1349	/* Add an overload option. */
1350	*m_pbCur++ = RTNET_DHCP_OPT_OPTION_OVERLOAD;
1351	*m_pbCur++ = fField;
1352	m_pfOverload = m_pbCur;
1353	m_pbCur++ = 1; / bp_file flag */
1354	}
1355	else
1356	*m_pfOverload \|= fField;
1357
1358	/* pad current option field */
1359	while (m_pbCur != m_pbEnd)
1360	m_pbCur++ = RTNET_DHCP_OPT_PAD; /* @todo not sure if this stuff is at all correct... */
1361
1362	/* switch */
1363	m_pbCur = pbNew;
1364	m_pbEnd = pbNewEnd;
1365	return true;
1366	}
1367
1368	/**
1369	* Begin an option.
1370	*
1371	* @returns true on succes, false if we're out of space.
1372	*
1373	* @param uOption The option number.
1374	* @param cb The amount of data.
1375	*/
1376	bool begin(uint8_t uOption, size_t cb)
1377	{
1378	/* Check that the data of the previous option has all been written. */
1379	Assert( !m_pOpt
1380	\|\| (m_pbCur - m_pOpt->dhcp_len == (uint8_t *)(m_pOpt + 1)));
1381	AssertMsg(cb <= 255, ("%#x\n", cb));
1382
1383	/* Check if we need to overload more stuff. */
1384	if ((uintptr_t)(m_pbEnd - m_pbCur) < cb + 2 + (m_pfOverload ? 1 : 3))
1385	{
1386	m_pOpt = NULL;
1387	if (!overloadMore())
1388	{
1389	m_fOverflowed = true;
1390	AssertMsgFailedReturn(("%u %#x\n", uOption, cb), false);
1391	}
1392	if ((uintptr_t)(m_pbEnd - m_pbCur) < cb + 2 + 1)
1393	{
1394	m_fOverflowed = true;
1395	AssertMsgFailedReturn(("%u %#x\n", uOption, cb), false);
1396	}
1397	}
1398
1399	/* Emit the option header. */
1400	m_pOpt = (PRTNETDHCPOPT)m_pbCur;
1401	m_pOpt->dhcp_opt = uOption;
1402	m_pOpt->dhcp_len = (uint8_t)cb;
1403	m_pbCur += 2;
1404	return true;
1405	}
1406
1407	/**
1408	* Puts option data.
1409	*
1410	* @param pvData The data.
1411	* @param cb The amount to put.
1412	*/
1413	void put(void const *pvData, size_t cb)
1414	{
1415	Assert(m_pOpt \|\| m_fOverflowed);
1416	if (RT_LIKELY(m_pOpt))
1417	{
1418	Assert((uintptr_t)m_pbCur - (uintptr_t)(m_pOpt + 1) + cb <= (size_t)m_pOpt->dhcp_len);
1419	memcpy(m_pbCur, pvData, cb);
1420	m_pbCur += cb;
1421	}
1422	}
1423
1424	/**
1425	* Puts an IPv4 Address.
1426	*
1427	* @param IPv4Addr The address.
1428	*/
1429	void putIPv4Addr(RTNETADDRIPV4 IPv4Addr)
1430	{
1431	put(&IPv4Addr, 4);
1432	}
1433
1434	/**
1435	* Adds an IPv4 address option.
1436	*
1437	* @returns true/false just like begin().
1438	*
1439	* @param uOption The option number.
1440	* @param IPv4Addr The address.
1441	*/
1442	bool optIPv4Addr(uint8_t uOption, RTNETADDRIPV4 IPv4Addr)
1443	{
1444	if (!begin(uOption, 4))
1445	return false;
1446	putIPv4Addr(IPv4Addr);
1447	return true;
1448	}
1449
1450	/**
1451	* Adds an option taking 1 or more IPv4 address.
1452	*
1453	* If the vector contains no addresses, the option will not be added.
1454	*
1455	* @returns true/false just like begin().
1456	*
1457	* @param uOption The option number.
1458	* @param rIPv4Addrs Reference to the address vector.
1459	*/
1460	bool optIPv4Addrs(uint8_t uOption, std::vector<RTNETADDRIPV4> const &rIPv4Addrs)
1461	{
1462	size_t const c = rIPv4Addrs.size();
1463	if (!c)
1464	return true;
1465
1466	if (!begin(uOption, 4*c))
1467	return false;
1468	for (size_t i = 0; i < c; i++)
1469	putIPv4Addr(rIPv4Addrs[i]);
1470	return true;
1471	}
1472
1473	/**
1474	* Puts an 8-bit integer.
1475	*
1476	* @param u8 The integer.
1477	*/
1478	void putU8(uint8_t u8)
1479	{
1480	put(&u8, 1);
1481	}
1482
1483	/**
1484	* Adds an 8-bit integer option.
1485	*
1486	* @returns true/false just like begin().
1487	*
1488	* @param uOption The option number.
1489	* @param u8 The integer
1490	*/
1491	bool optU8(uint8_t uOption, uint8_t u8)
1492	{
1493	if (!begin(uOption, 1))
1494	return false;
1495	putU8(u8);
1496	return true;
1497	}
1498
1499	/**
1500	* Puts an 32-bit integer (network endian).
1501	*
1502	* @param u32Network The integer.
1503	*/
1504	void putU32(uint32_t u32)
1505	{
1506	put(&u32, 4);
1507	}
1508
1509	/**
1510	* Adds an 32-bit integer (network endian) option.
1511	*
1512	* @returns true/false just like begin().
1513	*
1514	* @param uOption The option number.
1515	* @param u32Network The integer.
1516	*/
1517	bool optU32(uint8_t uOption, uint32_t u32)
1518	{
1519	if (!begin(uOption, 4))
1520	return false;
1521	putU32(u32);
1522	return true;
1523	}
1524
1525	/**
1526	* Puts a std::string.
1527	*
1528	* @param rStr Reference to the string.
1529	*/
1530	void putStr(std::string const &rStr)
1531	{
1532	put(rStr.c_str(), rStr.size());
1533	}
1534
1535	/**
1536	* Adds an std::string option if the string isn't empty.
1537	*
1538	* @returns true/false just like begin().
1539	*
1540	* @param uOption The option number.
1541	* @param rStr Reference to the string.
1542	*/
1543	bool optStr(uint8_t uOption, std::string const &rStr)
1544	{
1545	const size_t cch = rStr.size();
1546	if (!cch)
1547	return true;
1548
1549	if (!begin(uOption, cch))
1550	return false;
1551	put(rStr.c_str(), cch);
1552	return true;
1553	}
1554
1555	/**
1556	* Whether we've overflowed.
1557	*
1558	* @returns true on overflow, false otherwise.
1559	*/
1560	bool hasOverflowed(void) const
1561	{
1562	return m_fOverflowed;
1563	}
1564
1565	/**
1566	* Adds the terminating END option.
1567	*
1568	* The END will always be added as we're reserving room for it, however, we
1569	* might've dropped previous options due to overflows and that is what the
1570	* return status indicates.
1571	*
1572	* @returns true on success, false on a (previous) overflow.
1573	*/
1574	bool optEnd(void)
1575	{
1576	Assert((uintptr_t)(m_pbEnd - m_pbCur) < 4096);
1577	*m_pbCur++ = RTNET_DHCP_OPT_END;
1578	return !hasOverflowed();
1579	}
1580	};
1581
1582
1583	/**
1584	* Constructs and sends a reply to a client.
1585	*
1586	* @returns
1587	* @param uMsgType The DHCP message type.
1588	* @param pLease The lease. This can be NULL for some replies.
1589	* @param pDhcpMsg The client message. We will dig out the MAC address,
1590	* transaction ID, and requested options from this.
1591	* @param cb The size of the client message.
1592	*/
1593	void VBoxNetDhcp::makeDhcpReply(uint8_t uMsgType, VBoxNetDhcpLease *pLease, PCRTNETBOOTP pDhcpMsg, size_t cb)
1594	{
1595	size_t cbReply = RTNET_DHCP_NORMAL_SIZE; /** @todo respect the RTNET_DHCP_OPT_MAX_DHCP_MSG_SIZE option */
1596	PRTNETBOOTP pReply = (PRTNETBOOTP)alloca(cbReply);
1597
1598	/*
1599	* The fixed bits stuff.
1600	*/
1601	pReply->bp_op = RTNETBOOTP_OP_REPLY;
1602	pReply->bp_htype = RTNET_ARP_ETHER;
1603	pReply->bp_hlen = sizeof(RTMAC);
1604	pReply->bp_hops = 0;
1605	pReply->bp_xid = pDhcpMsg->bp_xid;
1606	pReply->bp_secs = 0;
1607	pReply->bp_flags = 0; // (pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST); ??
1608	pReply->bp_ciaddr.u = 0;
1609	pReply->bp_yiaddr.u = pLease ? pLease->m_IPv4Address.u : 0xffffffff;
1610	pReply->bp_siaddr.u = pLease && pLease->m_pCfg ? pLease->m_pCfg->m_TftpServerAddr.u : 0; /* (next server == TFTP)*/
1611	pReply->bp_giaddr.u = 0;
1612	memset(&pReply->bp_chaddr, '\0', sizeof(pReply->bp_chaddr));
1613	pReply->bp_chaddr.Mac = pDhcpMsg->bp_chaddr.Mac;
1614	memset(&pReply->bp_sname[0], '\0', sizeof(pReply->bp_sname));
1615	memset(&pReply->bp_file[0], '\0', sizeof(pReply->bp_file));
1616	pReply->bp_vend.Dhcp.dhcp_cookie = RT_H2N_U32_C(RTNET_DHCP_COOKIE);
1617	memset(&pReply->bp_vend.Dhcp.dhcp_opts[0], '\0', RTNET_DHCP_OPT_SIZE);
1618
1619	/*
1620	* The options - use a cursor class for dealing with the ugly stuff.
1621	*/
1622	VBoxNetDhcpWriteCursor Cursor(pReply, cbReply);
1623
1624	/* The basics */
1625	Cursor.optU8(RTNET_DHCP_OPT_MSG_TYPE, uMsgType);
1626	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SERVER_ID, m_Ipv4Address);
1627
1628	if (uMsgType != RTNET_DHCP_MT_NAC)
1629	{
1630	AssertReturnVoid(pLease && pLease->m_pCfg);
1631	const VBoxNetDhcpCfg pCfg = pLease->m_pCfg; / no need to retain it. */
1632
1633	/* The IP config. */
1634	Cursor.optU32(RTNET_DHCP_OPT_LEASE_TIME, RT_H2N_U32(pCfg->m_cSecLease));
1635	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SUBNET_MASK, pCfg->m_SubnetMask);
1636	Cursor.optIPv4Addrs(RTNET_DHCP_OPT_ROUTERS, pCfg->m_Routers);
1637	Cursor.optIPv4Addrs(RTNET_DHCP_OPT_ROUTERS, pCfg->m_DNSes);
1638	Cursor.optStr(RTNET_DHCP_OPT_HOST_NAME, pCfg->m_HostName);
1639	Cursor.optStr(RTNET_DHCP_OPT_DOMAIN_NAME, pCfg->m_DomainName);
1640
1641	/* The PXE config. */
1642	if (pCfg->m_BootfileName.size())
1643	{
1644	if (Cursor.useBpFile())
1645	RTStrPrintf((char *)&pReply->bp_file[0], sizeof(pReply->bp_file), "%s", pCfg->m_BootfileName.c_str());
1646	else
1647	Cursor.optStr(RTNET_DHCP_OPT_BOOTFILE_NAME, pCfg->m_BootfileName);
1648	}
1649	}
1650
1651	/* Terminate the options. */
1652	if (!Cursor.optEnd())
1653	debugPrint(0, true, "option overflow\n");
1654
1655	/*
1656	* Send it.
1657	*/
1658	int rc;
1659	#if 0
1660	if (!(pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST)) /** @todo need to see someone set this flag to check that it's correct. */
1661	{
1662	RTNETADDRIPV4 IPv4AddrBrdCast;
1663	IPv4AddrBrdCast.u = UINT32_C(0xffffffff); /* broadcast IP */
1664	rc = VBoxNetUDPUnicast(m_pSession, m_hIf, m_pIfBuf,
1665	m_Ipv4Address, &m_MacAddress, RTNETIPV4_PORT_BOOTPS, /* sender */
1666	IPv4AddrBrdCast, &pDhcpMsg->bp_chaddr.Mac, RTNETIPV4_PORT_BOOTPC, /* receiver */
1667	pReply, cbReply);
1668	}
1669	else
1670	#endif
1671	rc = VBoxNetUDPBroadcast(m_pSession, m_hIf, m_pIfBuf,
1672	m_Ipv4Address, &m_MacAddress, RTNETIPV4_PORT_BOOTPS, /* sender */
1673	RTNETIPV4_PORT_BOOTPC, /* receiver port */
1674	pReply, cbReply);
1675	if (RT_FAILURE(rc))
1676	debugPrint(0, true, "error %Rrc when sending the reply", rc);
1677	}
1678
1679
1680	/**
1681	* Look up a lease by MAC address.
1682	*
1683	* @returns Pointer to the lease if found, NULL if not found.
1684	* @param pMacAddress The mac address.
1685	* @param fAnyState Any state.
1686	*/
1687	VBoxNetDhcpLease *VBoxNetDhcp::findLeaseByMacAddress(PCRTMAC pMacAddress, bool fAnyState)
1688	{
1689	size_t iLease = m_Leases.size();
1690	while (iLease-- > 0)
1691	{
1692	VBoxNetDhcpLease *pLease = &m_Leases[iLease];
1693	if ( pLease
1694	&& pLease->m_MacAddress.au16[0] == pMacAddress->au16[0]
1695	&& pLease->m_MacAddress.au16[1] == pMacAddress->au16[1]
1696	&& pLease->m_MacAddress.au16[2] == pMacAddress->au16[2]
1697	&& ( fAnyState
1698	\|\| (pLease->m_enmState != VBoxNetDhcpLease::kState_Free)) )
1699	return pLease;
1700	}
1701
1702	return NULL;
1703	}
1704
1705
1706	/**
1707	* Look up a lease by IPv4 and MAC addresses.
1708	*
1709	* @returns Pointer to the lease if found, NULL if not found.
1710	* @param IPv4Addr The IPv4 address.
1711	* @param pMacAddress The mac address.
1712	* @param fAnyState Any state.
1713	*/
1714	VBoxNetDhcpLease *VBoxNetDhcp::findLeaseByIpv4AndMacAddresses(RTNETADDRIPV4 IPv4Addr, PCRTMAC pMacAddress, bool fAnyState)
1715	{
1716	size_t iLease = m_Leases.size();
1717	while (iLease-- > 0)
1718	{
1719	VBoxNetDhcpLease *pLease = &m_Leases[iLease];
1720	if ( pLease
1721	&& pLease->m_IPv4Address.u == IPv4Addr.u
1722	&& pLease->m_MacAddress.au16[0] == pMacAddress->au16[0]
1723	&& pLease->m_MacAddress.au16[1] == pMacAddress->au16[1]
1724	&& pLease->m_MacAddress.au16[2] == pMacAddress->au16[2]
1725	&& ( fAnyState
1726	\|\| (pLease->m_enmState != VBoxNetDhcpLease::kState_Free)) )
1727	return pLease;
1728	}
1729
1730	return NULL;
1731	}
1732
1733
1734	/**
1735	* Creates a new lease for the client specified in the DHCP message.
1736	*
1737	* The caller has already made sure it doesn't already have a lease.
1738	*
1739	* @returns Pointer to the lease if found, NULL+log if not found.
1740	* @param IPv4Addr The IPv4 address.
1741	* @param pMacAddress The MAC address.
1742	*/
1743	VBoxNetDhcpLease *VBoxNetDhcp::newLease(PCRTNETBOOTP pDhcpMsg, size_t cb)
1744	{
1745	RTMAC const MacAddr = pDhcpMsg->bp_chaddr.Mac;
1746	RTTIMESPEC Now;
1747	RTTimeNow(&Now);
1748
1749	/*
1750	* Search the possible leases.
1751	*
1752	* We'll try do all the searches in one pass, that is to say, perfect
1753	* match, old lease, and next free/expired lease.
1754	*/
1755	VBoxNetDhcpLease *pBest = NULL;
1756	VBoxNetDhcpLease *pOld = NULL;
1757	VBoxNetDhcpLease *pFree = NULL;
1758
1759	size_t cLeases = m_Leases.size();
1760	for (size_t i = 0; i < cLeases; i++)
1761	{
1762	VBoxNetDhcpLease *pCur = &m_Leases[i];
1763
1764	/* Skip it if no configuration, that means its not in the current config. */
1765	if (!pCur->m_pCfg)
1766	continue;
1767
1768	/* best */
1769	if ( pCur->isOneSpecificClient()
1770	&& pCur->m_pCfg->matchesMacAddress(&MacAddr))
1771	{
1772	if ( !pBest
1773	\|\| pBest->m_pCfg->m_MacAddresses.size() < pCur->m_pCfg->m_MacAddresses.size())
1774	pBest = pCur;
1775	}
1776
1777	/* old lease */
1778	if ( pCur->m_MacAddress.au16[0] == MacAddr.au16[0]
1779	&& pCur->m_MacAddress.au16[1] == MacAddr.au16[1]
1780	&& pCur->m_MacAddress.au16[2] == MacAddr.au16[2])
1781	{
1782	if ( !pOld
1783	\|\| RTTimeSpecGetSeconds(&pCur->m_ExpireTime) > RTTimeSpecGetSeconds(&pFree->m_ExpireTime))
1784	pOld = pCur;
1785	}
1786
1787	/* expired lease */
1788	if (!pCur->isInUse(&Now))
1789	{
1790	if ( !pFree
1791	\|\| RTTimeSpecGetSeconds(&pCur->m_ExpireTime) < RTTimeSpecGetSeconds(&pFree->m_ExpireTime))
1792	pFree = pCur;
1793	}
1794	}
1795
1796	VBoxNetDhcpLease *pNew = pBest;
1797	if (!pNew)
1798	pNew = pOld;
1799	if (!pNew)
1800	pNew = pFree;
1801	if (!pNew)
1802	{
1803	debugPrint(0, true, "No more leases.");
1804	return NULL;
1805	}
1806
1807	/*
1808	* Init the lease.
1809	*/
1810	pNew->m_MacAddress = MacAddr;
1811	pNew->m_xid = pDhcpMsg->bp_xid;
1812	/** @todo extract the client id. */
1813
1814	return pNew;
1815	}
1816
1817
1818	/**
1819	* Finds an option.
1820	*
1821	* @returns On success, a pointer to the first byte in the option data (no none
1822	* then it'll be the byte following the 0 size field) and *pcbOpt set
1823	* to the option length.
1824	* On failure, NULL is returned and *pcbOpt unchanged.
1825	*
1826	* @param uOption The option to search for.
1827	* @param pDhcpMsg The DHCP message.
1828	* @param cb The size of the message.
1829	* @param pcbOpt Where to store the option size size. Optional. Note
1830	* that this is adjusted if the option length is larger
1831	* than the message buffer.
1832	*/
1833	/* static / const uint8_t
1834	VBoxNetDhcp::findOption(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, size_t *pcbOpt)
1835	{
1836	Assert(uOption != RTNET_DHCP_OPT_PAD);
1837
1838	/*
1839	* Validate the DHCP bits and figure the max size of the options in the vendor field.
1840	*/
1841	if (cb <= RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts))
1842	return NULL;
1843	if (pDhcpMsg->bp_vend.Dhcp.dhcp_cookie != RT_H2N_U32_C(RTNET_DHCP_COOKIE))
1844	return NULL;
1845	size_t cbLeft = cb - RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts);
1846	if (cbLeft > RTNET_DHCP_OPT_SIZE)
1847	cbLeft = RTNET_DHCP_OPT_SIZE;
1848
1849	/*
1850	* Search the vendor field.
1851	*/
1852	bool fExtended = false;
1853	uint8_t const *pb = &pDhcpMsg->bp_vend.Dhcp.dhcp_opts[0];
1854	while (pb && cbLeft > 0)
1855	{
1856	uint8_t uCur = *pb;
1857	if (uCur == RTNET_DHCP_OPT_PAD)
1858	{
1859	cbLeft--;
1860	pb++;
1861	}
1862	else if (cbLeft <= 1)
1863	break;
1864	else
1865	{
1866	size_t cbCur = pb[1];
1867	if (cbCur > cbLeft - 2)
1868	cbCur = cbLeft - 2;
1869	if (uCur == uOption)
1870	{
1871	if (pcbOpt)
1872	*pcbOpt = cbCur;
1873	return pb+2;
1874	}
1875	pb += cbCur + 2;
1876	cbLeft -= cbCur - 2;
1877	}
1878	}
1879
1880	/** @todo search extended dhcp option field(s) when present */
1881
1882	return NULL;
1883	}
1884
1885
1886	/**
1887	* Locates an option with an IPv4 address in the DHCP message.
1888	*
1889	* @returns true and *pIpv4Addr if found, false if not.
1890	*
1891	* @param uOption The option to find.
1892	* @param pDhcpMsg The DHCP message.
1893	* @param cb The size of the message.
1894	* @param pIPv4Addr Where to put the address.
1895	*/
1896	/* static */ bool
1897	VBoxNetDhcp::findOptionIPv4Addr(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cb, PRTNETADDRIPV4 pIPv4Addr)
1898	{
1899	size_t cbOpt;
1900	uint8_t const *pbOpt = findOption(uOption, pDhcpMsg, cb, &cbOpt);
1901	if (pbOpt)
1902	{
1903	if (cbOpt >= sizeof(RTNETADDRIPV4))
1904	{
1905	pIPv4Addr = (PCRTNETADDRIPV4)pbOpt;
1906	return true;
1907	}
1908	}
1909	return false;
1910	}
1911
1912
1913	/**
1914	* Print debug message depending on the m_cVerbosity level.
1915	*
1916	* @param iMinLevel The minimum m_cVerbosity level for this message.
1917	* @param fMsg Whether to dump parts for the current DHCP message.
1918	* @param pszFmt The message format string.
1919	* @param ... Optional arguments.
1920	*/
1921	inline void VBoxNetDhcp::debugPrint(int32_t iMinLevel, bool fMsg, const char *pszFmt, ...) const
1922	{
1923	if (iMinLevel <= m_cVerbosity)
1924	{
1925	va_list va;
1926	va_start(va, pszFmt);
1927	debugPrintV(iMinLevel, fMsg, pszFmt, va);
1928	va_end(va);
1929	}
1930	}
1931
1932
1933	/**
1934	* Print debug message depending on the m_cVerbosity level.
1935	*
1936	* @param iMinLevel The minimum m_cVerbosity level for this message.
1937	* @param fMsg Whether to dump parts for the current DHCP message.
1938	* @param pszFmt The message format string.
1939	* @param va Optional arguments.
1940	*/
1941	void VBoxNetDhcp::debugPrintV(int iMinLevel, bool fMsg, const char *pszFmt, va_list va) const
1942	{
1943	if (iMinLevel <= m_cVerbosity)
1944	{
1945	va_list vaCopy; /* This dude is very special, thus the copy. */
1946	va_copy(vaCopy, va);
1947	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: %s: %N\n", iMinLevel >= 2 ? "debug" : "info", pszFmt, &vaCopy);
1948	va_end(vaCopy);
1949
1950	if ( fMsg
1951	&& m_cVerbosity >= 2
1952	&& m_pCurMsg)
1953	{
1954	const char *pszMsg = m_uCurMsgType != UINT8_MAX ? debugDhcpName(m_uCurMsgType) : "";
1955	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",
1956	pszMsg,
1957	&m_pCurMsg->bp_chaddr,
1958	m_pCurMsg->bp_ciaddr.au8[0], m_pCurMsg->bp_ciaddr.au8[1], m_pCurMsg->bp_ciaddr.au8[2], m_pCurMsg->bp_ciaddr.au8[3],
1959	m_pCurMsg->bp_yiaddr.au8[0], m_pCurMsg->bp_yiaddr.au8[1], m_pCurMsg->bp_yiaddr.au8[2], m_pCurMsg->bp_yiaddr.au8[3],
1960	m_pCurMsg->bp_siaddr.au8[0], m_pCurMsg->bp_siaddr.au8[1], m_pCurMsg->bp_siaddr.au8[2], m_pCurMsg->bp_siaddr.au8[3],
1961	m_pCurMsg->bp_xid);
1962	}
1963	}
1964	}
1965
1966
1967	/**
1968	* Gets the name of given DHCP message type.
1969	*
1970	* @returns Readonly name.
1971	* @param uMsgType The message number.
1972	*/
1973	/* static / const char VBoxNetDhcp::debugDhcpName(uint8_t uMsgType)
1974	{
1975	switch (uMsgType)
1976	{
1977	case 0: return "MT_00";
1978	case RTNET_DHCP_MT_DISCOVER: return "DISCOVER";
1979	case RTNET_DHCP_MT_OFFER: return "OFFER";
1980	case RTNET_DHCP_MT_REQUEST: return "REQUEST";
1981	case RTNET_DHCP_MT_DECLINE: return "DECLINE";
1982	case RTNET_DHCP_MT_ACK: return "ACK";
1983	case RTNET_DHCP_MT_NAC: return "NAC";
1984	case RTNET_DHCP_MT_RELEASE: return "RELEASE";
1985	case RTNET_DHCP_MT_INFORM: return "INFORM";
1986	case 9: return "MT_09";
1987	case 10: return "MT_0a";
1988	case 11: return "MT_0b";
1989	case 12: return "MT_0c";
1990	case 13: return "MT_0d";
1991	case 14: return "MT_0e";
1992	case 15: return "MT_0f";
1993	case 16: return "MT_10";
1994	case 17: return "MT_11";
1995	case 18: return "MT_12";
1996	case 19: return "MT_13";
1997	case UINT8_MAX: return "MT_ff";
1998	default: return "UNKNOWN";
1999	}
2000	}
2001
2002
2003
2004	/**
2005	* Entry point.
2006	*/
2007	extern "C" DECLEXPORT(int) TrustedMain(int argc, char argv, char envp)
2008	{
2009	/*
2010	* Instantiate the DHCP server and hand it the options.
2011	*/
2012	VBoxNetDhcp *pDhcp = new VBoxNetDhcp();
2013	if (!pDhcp)
2014	{
2015	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: new VBoxNetDhcp failed!\n");
2016	return 1;
2017	}
2018	int rc = pDhcp->parseArgs(argc - 1, argv + 1);
2019	if (rc)
2020	return rc;
2021
2022	/*
2023	* Try connect the server to the network.
2024	*/
2025	rc = pDhcp->tryGoOnline();
2026	if (rc)
2027	{
2028	delete pDhcp;
2029	return rc;
2030	}
2031
2032	/*
2033	* Process requests.
2034	*/
2035	g_pDhcp = pDhcp;
2036	rc = pDhcp->run();
2037	g_pDhcp = NULL;
2038	delete pDhcp;
2039
2040	return rc;
2041	}
2042
2043
2044	#ifndef VBOX_WITH_HARDENING
2045
2046	int main(int argc, char argv, char envp)
2047	{
2048	int rc = RTR3InitAndSUPLib();
2049	if (RT_FAILURE(rc))
2050	{
2051	RTStrmPrintf(g_pStdErr, "VBoxNetDHCP: RTR3InitAndSupLib failed, rc=%Rrc\n", rc);
2052	return 1;
2053	}
2054
2055	return TrustedMain(argc, argv, envp);
2056	}
2057
2058	# ifdef RT_OS_WINDOWS
2059
2060	static LRESULT CALLBACK WindowProc(HWND hwnd,
2061	UINT uMsg,
2062	WPARAM wParam,
2063	LPARAM lParam
2064	)
2065	{
2066	if(uMsg == WM_DESTROY)
2067	{
2068	PostQuitMessage(0);
2069	return 0;
2070	}
2071	return DefWindowProc (hwnd, uMsg, wParam, lParam);
2072	}
2073
2074	static LPCSTR g_WndClassName = "VBoxNetDHCPClass";
2075
2076	static DWORD WINAPI MsgThreadProc(__in LPVOID lpParameter)
2077	{
2078	HWND hwnd = 0;
2079	HINSTANCE hInstance = (HINSTANCE)GetModuleHandle (NULL);
2080	bool bExit = false;
2081
2082	/* Register the Window Class. */
2083	WNDCLASS wc;
2084	wc.style = 0;
2085	wc.lpfnWndProc = WindowProc;
2086	wc.cbClsExtra = 0;
2087	wc.cbWndExtra = sizeof(void *);
2088	wc.hInstance = hInstance;
2089	wc.hIcon = NULL;
2090	wc.hCursor = NULL;
2091	wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
2092	wc.lpszMenuName = NULL;
2093	wc.lpszClassName = g_WndClassName;
2094
2095	ATOM atomWindowClass = RegisterClass(&wc);
2096
2097	if (atomWindowClass != 0)
2098	{
2099	/* Create the window. */
2100	hwnd = CreateWindowEx (WS_EX_TOOLWINDOW \| WS_EX_TRANSPARENT \| WS_EX_TOPMOST,
2101	g_WndClassName, g_WndClassName,
2102	WS_POPUPWINDOW,
2103	-200, -200, 100, 100, NULL, NULL, hInstance, NULL);
2104
2105	if (hwnd)
2106	{
2107	SetWindowPos(hwnd, HWND_TOPMOST, -200, -200, 0, 0,
2108	SWP_NOACTIVATE \| SWP_HIDEWINDOW \| SWP_NOCOPYBITS \| SWP_NOREDRAW \| SWP_NOSIZE);
2109
2110	MSG msg;
2111	while (GetMessage(&msg, NULL, 0, 0))
2112	{
2113	TranslateMessage(&msg);
2114	DispatchMessage(&msg);
2115	}
2116
2117	DestroyWindow (hwnd);
2118
2119	bExit = true;
2120	}
2121
2122	UnregisterClass (g_WndClassName, hInstance);
2123	}
2124
2125	if(bExit)
2126	{
2127	/* no need any accuracy here, in anyway the DHCP server usually gets terminated with TerminateProcess */
2128	exit(0);
2129	}
2130
2131	return 0;
2132	}
2133
2134
2135	/** (We don't want a console usually.) */
2136	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
2137	{
2138	NOREF(hInstance); NOREF(hPrevInstance); NOREF(lpCmdLine); NOREF(nCmdShow);
2139
2140	HANDLE hThread = CreateThread(
2141	NULL, /__in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes, /
2142	0, /__in SIZE_T dwStackSize, /
2143	MsgThreadProc, /__in LPTHREAD_START_ROUTINE lpStartAddress,/
2144	NULL, /__in_opt LPVOID lpParameter,/
2145	0, /__in DWORD dwCreationFlags,/
2146	NULL /__out_opt LPDWORD lpThreadId/
2147	);
2148
2149	if(hThread != NULL)
2150	CloseHandle(hThread);
2151
2152	return main(__argc, __argv, environ);
2153	}
2154	# endif /* RT_OS_WINDOWS */
2155
2156	#endif /* !VBOX_WITH_HARDENING */
2157

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source: vbox/trunk/src/VBox/NetworkServices/DHCP/VBoxNetDHCP.cpp@ 19255

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