Config.cpp@ 79524

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1	/* $Id: Config.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* Configuration for DHCP.
4	*/
5
6	/*
7	* Copyright (C) 2013-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/**
20	* XXX: license.
21	*/
22
23	#include <iprt/asm.h>
24	#include <iprt/getopt.h>
25	#include <iprt/net.h>
26	#include <iprt/time.h>
27
28	#include <VBox/sup.h>
29	#include <VBox/intnet.h>
30	#include <VBox/intnetinline.h>
31	#include <VBox/vmm/vmm.h>
32	#include <VBox/version.h>
33
34	#include <VBox/com/array.h>
35	#include <VBox/com/string.h>
36
37	#include <iprt/cpp/xml.h>
38
39	#define BASE_SERVICES_ONLY
40	#include "../NetLib/VBoxNetBaseService.h"
41	#include "../NetLib/VBoxNetLib.h"
42	#include "../NetLib/shared_ptr.h"
43
44	#include <list>
45	#include <vector>
46	#include <map>
47	#include <string>
48
49	#include "Config.h"
50	#include "ClientDataInt.h"
51
52	bool operator== (const Lease& lhs, const Lease& rhs)
53	{
54	return (lhs.m.get() == rhs.m.get());
55	}
56
57
58	bool operator!= (const Lease& lhs, const Lease& rhs)
59	{
60	return !(lhs == rhs);
61	}
62
63
64	bool operator< (const Lease& lhs, const Lease& rhs)
65	{
66	return ( (lhs.getAddress() < rhs.getAddress())
67	\|\| (lhs.issued() < rhs.issued()));
68	}
69	/* consts */
70
71	const NullConfigEntity *g_NullConfig = new NullConfigEntity();
72	RootConfigEntity g_RootConfig = new RootConfigEntity(std::string("ROOT"), 1200 / 20 min. */);
73	const ClientMatchCriteria *g_AnyClient = new AnyClientMatchCriteria();
74
75	static ConfigurationManager *g_ConfigurationManager = ConfigurationManager::getConfigurationManager();
76
77	NetworkManager *NetworkManager::g_NetworkManager;
78
79	bool MACClientMatchCriteria::check(const Client& client) const
80	{
81	return (client == m_mac);
82	}
83
84
85	int BaseConfigEntity::match(Client& client, BaseConfigEntity **cfg)
86	{
87	int iMatch = (m_criteria && m_criteria->check(client) ? m_MatchLevel : 0);
88	if (m_children.empty())
89	{
90	if (iMatch > 0)
91	{
92	*cfg = this;
93	return iMatch;
94	}
95	}
96	else
97	{
98	*cfg = this;
99	/* XXX: hack */
100	BaseConfigEntity *matching = this;
101	int matchingLevel = m_MatchLevel;
102
103	for (std::vector<BaseConfigEntity *>::iterator it = m_children.begin();
104	it != m_children.end();
105	++it)
106	{
107	iMatch = (*it)->match(client, &matching);
108	if (iMatch > matchingLevel)
109	{
110	*cfg = matching;
111	matchingLevel = iMatch;
112	}
113	}
114	return matchingLevel;
115	}
116	return iMatch;
117	}
118
119	/* Client */
120	/* Configs
121	NetworkConfigEntity(std::string name,
122	ConfigEntity* pCfg,
123	ClientMatchCriteria* criteria,
124	RTNETADDRIPV4& networkID,
125	RTNETADDRIPV4& networkMask)
126	*/
127	static const RTNETADDRIPV4 g_AnyIpv4 = {0};
128	static const RTNETADDRIPV4 g_AllIpv4 = {0xffffffff};
129	RootConfigEntity::RootConfigEntity(std::string name, uint32_t expPeriod):
130	NetworkConfigEntity(name, g_NullConfig, g_AnyClient, g_AnyIpv4, g_AllIpv4)
131	{
132	m_MatchLevel = 2;
133	m_u32ExpirationPeriod = expPeriod;
134	}
135
136	/* Configuration Manager */
137	struct ConfigurationManager::Data
138	{
139	Data():fFileExists(false){}
140
141	MapLease2Ip4Address m_allocations;
142	Ipv4AddressContainer m_nameservers;
143	Ipv4AddressContainer m_routers;
144
145	std::string m_domainName;
146	VecClient m_clients;
147	com::Utf8Str m_leaseStorageFilename;
148	bool fFileExists;
149	};
150
151	ConfigurationManager *ConfigurationManager::getConfigurationManager()
152	{
153	if (!g_ConfigurationManager)
154
155
156	{
157	g_ConfigurationManager = new ConfigurationManager();
158	g_ConfigurationManager->init();
159	}
160
161	return g_ConfigurationManager;
162	}
163
164
165	const std::string tagXMLLeases = "Leases";
166	const std::string tagXMLLeasesAttributeVersion = "version";
167	const std::string tagXMLLeasesVersion_1_0 = "1.0";
168	const std::string tagXMLLease = "Lease";
169	const std::string tagXMLLeaseAttributeMac = "mac";
170	const std::string tagXMLLeaseAttributeNetwork = "network";
171	const std::string tagXMLLeaseAddress = "Address";
172	const std::string tagXMLAddressAttributeValue = "value";
173	const std::string tagXMLLeaseTime = "Time";
174	const std::string tagXMLTimeAttributeIssued = "issued";
175	const std::string tagXMLTimeAttributeExpiration = "expiration";
176	const std::string tagXMLLeaseOptions = "Options";
177
178	/**
179	* @verbatim
180	<Leases version="1.0">
181	<Lease mac="" network=""/>
182	<Address value=""/>
183	<Time issued="" expiration=""/>
184	<options>
185	<option name="" type=""/>
186	</option>
187	</options>
188	</Lease>
189	</Leases>
190	@endverbatim
191	*/
192	int ConfigurationManager::loadFromFile(const com::Utf8Str& leaseStorageFileName)
193	{
194	m->m_leaseStorageFilename = leaseStorageFileName;
195
196	xml::XmlFileParser parser;
197	xml::Document doc;
198
199	try {
200	parser.read(m->m_leaseStorageFilename.c_str(), doc);
201	}
202	catch (...)
203	{
204	return VINF_SUCCESS;
205	}
206
207	/* XML parsing */
208	xml::ElementNode *root = doc.getRootElement();
209
210	if (!root \|\| !root->nameEquals(tagXMLLeases.c_str()))
211	{
212	m->fFileExists = false;
213	return VERR_NOT_FOUND;
214	}
215
216	com::Utf8Str version;
217	if (root)
218	root->getAttributeValue(tagXMLLeasesAttributeVersion.c_str(), version);
219
220	/* XXX: version check */
221	xml::NodesLoop leases(*root);
222
223	const xml::ElementNode *lease;
224	while ((lease = leases.forAllNodes()))
225	{
226	if (!lease->nameEquals(tagXMLLease.c_str()))
227	continue;
228
229	ClientData *data = new ClientData();
230	Lease l(data);
231	if (l.fromXML(lease))
232	{
233
234	m->m_allocations.insert(MapLease2Ip4AddressPair(l, l.getAddress()));
235
236
237	NetworkConfigEntity *pNetCfg = NULL;
238	Client c(data);
239	int rc = g_RootConfig->match(c, (BaseConfigEntity **)&pNetCfg);
240	Assert(rc >= 0 && pNetCfg); RT_NOREF(rc);
241
242	l.setConfig(pNetCfg);
243
244	m->m_clients.push_back(c);
245	}
246	}
247
248	return VINF_SUCCESS;
249	}
250
251
252	int ConfigurationManager::saveToFile()
253	{
254	if (m->m_leaseStorageFilename.isEmpty())
255	return VINF_SUCCESS;
256
257	xml::Document doc;
258
259	xml::ElementNode *root = doc.createRootElement(tagXMLLeases.c_str());
260	if (!root)
261	return VERR_INTERNAL_ERROR;
262
263	root->setAttribute(tagXMLLeasesAttributeVersion.c_str(), tagXMLLeasesVersion_1_0.c_str());
264
265	for(MapLease2Ip4AddressConstIterator it = m->m_allocations.begin();
266	it != m->m_allocations.end(); ++it)
267	{
268	xml::ElementNode *lease = root->createChild(tagXMLLease.c_str());
269	if (!it->first.toXML(lease))
270	{
271	/* XXX: todo logging + error handling */
272	}
273	}
274
275	try {
276	xml::XmlFileWriter writer(doc);
277	writer.write(m->m_leaseStorageFilename.c_str(), true);
278	} catch(...){}
279
280	return VINF_SUCCESS;
281	}
282
283
284	int ConfigurationManager::extractRequestList(PCRTNETBOOTP pDhcpMsg, size_t cbDhcpMsg, RawOption& rawOpt)
285	{
286	return ConfigurationManager::findOption(RTNET_DHCP_OPT_PARAM_REQ_LIST, pDhcpMsg, cbDhcpMsg, rawOpt);
287	}
288
289
290	Client ConfigurationManager::getClientByDhcpPacket(const RTNETBOOTP *pDhcpMsg, size_t cbDhcpMsg)
291	{
292
293	VecClientIterator it;
294	bool fDhcpValid = false;
295	uint8_t uMsgType = 0;
296
297	fDhcpValid = RTNetIPv4IsDHCPValid(NULL, pDhcpMsg, cbDhcpMsg, &uMsgType);
298	AssertReturn(fDhcpValid, Client::NullClient);
299
300	LogFlowFunc(("dhcp:mac:%RTmac\n", &pDhcpMsg->bp_chaddr.Mac));
301	/* 1st. client IDs */
302	for ( it = m->m_clients.begin();
303	it != m->m_clients.end();
304	++it)
305	{
306	if ((*it) == pDhcpMsg->bp_chaddr.Mac)
307	{
308	LogFlowFunc(("client:mac:%RTmac\n", it->getMacAddress()));
309	/* check timestamp that request wasn't expired. */
310	return (*it);
311	}
312	}
313
314	if (it == m->m_clients.end())
315	{
316	/* We hasn't got any session for this client */
317	Client c;
318	c.initWithMac(pDhcpMsg->bp_chaddr.Mac);
319	m->m_clients.push_back(c);
320	return m->m_clients.back();
321	}
322
323	return Client::NullClient;
324	}
325
326	/**
327	* Finds an option.
328	*
329	* @returns On success, a pointer to the first byte in the option data (no none
330	* then it'll be the byte following the 0 size field) and *pcbOpt set
331	* to the option length.
332	* On failure, NULL is returned and *pcbOpt unchanged.
333	*
334	* @param uOption The option to search for.
335	* @param pDhcpMsg The DHCP message.
336	* that this is adjusted if the option length is larger
337	* than the message buffer.
338	* @param cbDhcpMsg Size of the DHCP message.
339	* @param opt The actual option we found.
340	*/
341	int
342	ConfigurationManager::findOption(uint8_t uOption, PCRTNETBOOTP pDhcpMsg, size_t cbDhcpMsg, RawOption& opt)
343	{
344	Assert(uOption != RTNET_DHCP_OPT_PAD);
345	Assert(uOption != RTNET_DHCP_OPT_END);
346
347	/*
348	* Validate the DHCP bits and figure the max size of the options in the vendor field.
349	*/
350	if (cbDhcpMsg <= RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts))
351	return VERR_INVALID_PARAMETER;
352
353	if (pDhcpMsg->bp_vend.Dhcp.dhcp_cookie != RT_H2N_U32_C(RTNET_DHCP_COOKIE))
354	return VERR_INVALID_PARAMETER;
355
356	size_t cbLeft = cbDhcpMsg - RT_UOFFSETOF(RTNETBOOTP, bp_vend.Dhcp.dhcp_opts);
357	if (cbLeft > RTNET_DHCP_OPT_SIZE)
358	cbLeft = RTNET_DHCP_OPT_SIZE;
359
360	/*
361	* Search the vendor field.
362	*/
363	uint8_t const *pb = &pDhcpMsg->bp_vend.Dhcp.dhcp_opts[0];
364	while (pb && cbLeft > 0)
365	{
366	uint8_t uCur = *pb;
367	if (uCur == RTNET_DHCP_OPT_PAD)
368	{
369	cbLeft--;
370	pb++;
371	}
372	else if (uCur == RTNET_DHCP_OPT_END)
373	break;
374	else if (cbLeft <= 1)
375	break;
376	else
377	{
378	uint8_t cbCur = pb[1];
379	if (cbCur > cbLeft - 2)
380	cbCur = (uint8_t)(cbLeft - 2);
381	if (uCur == uOption)
382	{
383	opt.u8OptId = uCur;
384	memcpy(opt.au8RawOpt, pb+2, cbCur);
385	opt.cbRawOpt = cbCur;
386	return VINF_SUCCESS;
387	}
388	pb += cbCur + 2;
389	cbLeft -= cbCur + 2;
390	}
391	}
392
393	/** @todo search extended dhcp option field(s) when present */
394
395	return VERR_NOT_FOUND;
396	}
397
398
399	/**
400	* We bind lease for client till it continue with it on DHCPREQUEST.
401	*/
402	Lease ConfigurationManager::allocateLease4Client(const Client& client, PCRTNETBOOTP pDhcpMsg, size_t cbDhcpMsg)
403	{
404	{
405	/**
406	* This mean that client has already bound or commited lease.
407	* If we've it happens it means that we received DHCPDISCOVER twice.
408	*/
409	const Lease l = client.lease();
410	if (l != Lease::NullLease)
411	{
412	/* Here we should take lease from the m_allocation which was feed with leases
413	* on start
414	*/
415	if (l.isExpired())
416	{
417	expireLease4Client(const_cast<Client&>(client));
418	if (!l.isExpired())
419	return l;
420	}
421	else
422	{
423	AssertReturn(l.getAddress().u != 0, Lease::NullLease);
424	return l;
425	}
426	}
427	}
428
429	RTNETADDRIPV4 hintAddress;
430	RawOption opt;
431	NetworkConfigEntity *pNetCfg;
432
433	Client cl(client);
434	AssertReturn(g_RootConfig->match(cl, (BaseConfigEntity **)&pNetCfg) > 0, Lease::NullLease);
435
436	/* DHCPDISCOVER MAY contain request address */
437	hintAddress.u = 0;
438	int rc = findOption(RTNET_DHCP_OPT_REQ_ADDR, pDhcpMsg, cbDhcpMsg, opt);
439	if (RT_SUCCESS(rc))
440	{
441	hintAddress.u = (uint32_t )opt.au8RawOpt;
442	if ( RT_H2N_U32(hintAddress.u) < RT_H2N_U32(pNetCfg->lowerIp().u)
443	\|\| RT_H2N_U32(hintAddress.u) > RT_H2N_U32(pNetCfg->upperIp().u))
444	hintAddress.u = 0; /* clear hint */
445	}
446
447	if ( hintAddress.u
448	&& !isAddressTaken(hintAddress))
449	{
450	Lease l(cl);
451	l.setConfig(pNetCfg);
452	l.setAddress(hintAddress);
453	m->m_allocations.insert(MapLease2Ip4AddressPair(l, hintAddress));
454	return l;
455	}
456
457	uint32_t u32 = 0;
458	for(u32 = RT_H2N_U32(pNetCfg->lowerIp().u);
459	u32 <= RT_H2N_U32(pNetCfg->upperIp().u);
460	++u32)
461	{
462	RTNETADDRIPV4 address;
463	address.u = RT_H2N_U32(u32);
464	if (!isAddressTaken(address))
465	{
466	Lease l(cl);
467	l.setConfig(pNetCfg);
468	l.setAddress(address);
469	m->m_allocations.insert(MapLease2Ip4AddressPair(l, address));
470	return l;
471	}
472	}
473
474	return Lease::NullLease;
475	}
476
477
478	int ConfigurationManager::commitLease4Client(Client& client)
479	{
480	Lease l = client.lease();
481	AssertReturn(l != Lease::NullLease, VERR_INTERNAL_ERROR);
482
483	l.bindingPhase(false);
484	const NetworkConfigEntity *pCfg = l.getConfig();
485
486	AssertPtr(pCfg);
487	l.setExpiration(pCfg->expirationPeriod());
488	l.phaseStart(RTTimeMilliTS());
489
490	saveToFile();
491
492	return VINF_SUCCESS;
493	}
494
495
496	int ConfigurationManager::expireLease4Client(Client& client)
497	{
498	Lease l = client.lease();
499	AssertReturn(l != Lease::NullLease, VERR_INTERNAL_ERROR);
500
501	if (l.isInBindingPhase())
502	{
503
504	MapLease2Ip4AddressIterator it = m->m_allocations.find(l);
505	AssertReturn(it != m->m_allocations.end(), VERR_NOT_FOUND);
506
507	/*
508	* XXX: perhaps it better to keep this allocation ????
509	*/
510	m->m_allocations.erase(it);
511
512	l.expire();
513	return VINF_SUCCESS;
514	}
515
516	l = Lease(client); /* re-new */
517	return VINF_SUCCESS;
518	}
519
520
521	bool ConfigurationManager::isAddressTaken(const RTNETADDRIPV4& addr, Lease& lease)
522	{
523	MapLease2Ip4AddressIterator it;
524
525	for (it = m->m_allocations.begin();
526	it != m->m_allocations.end();
527	++it)
528	{
529	if (it->second.u == addr.u)
530	{
531	if (lease != Lease::NullLease)
532	lease = it->first;
533
534	return true;
535	}
536	}
537	lease = Lease::NullLease;
538	return false;
539	}
540
541
542	bool ConfigurationManager::isAddressTaken(const RTNETADDRIPV4& addr)
543	{
544	Lease ignore;
545	return isAddressTaken(addr, ignore);
546	}
547
548
549	NetworkConfigEntity ConfigurationManager::addNetwork(NetworkConfigEntity ,
550	const RTNETADDRIPV4& networkId,
551	const RTNETADDRIPV4& netmask,
552	RTNETADDRIPV4& LowerAddress,
553	RTNETADDRIPV4& UpperAddress)
554	{
555	static int id;
556	char name[64];
557
558	RTStrPrintf(name, RT_ELEMENTS(name), "network-%d", id);
559	std::string strname(name);
560	id++;
561
562
563	if (!LowerAddress.u)
564	LowerAddress = networkId;
565
566	if (!UpperAddress.u)
567	UpperAddress.u = networkId.u \| (~netmask.u);
568
569	return new NetworkConfigEntity(strname,
570	g_RootConfig,
571	g_AnyClient,
572	5,
573	networkId,
574	netmask,
575	LowerAddress,
576	UpperAddress);
577	}
578
579	HostConfigEntity ConfigurationManager::addHost(NetworkConfigEntity pCfg,
580	const RTNETADDRIPV4& address,
581	ClientMatchCriteria *criteria)
582	{
583	static int id;
584	char name[64];
585
586	RTStrPrintf(name, RT_ELEMENTS(name), "host-%d", id);
587	std::string strname(name);
588	id++;
589
590	return new HostConfigEntity(address, strname, pCfg, criteria);
591	}
592
593	int ConfigurationManager::addToAddressList(uint8_t u8OptId, RTNETADDRIPV4& address)
594	{
595	switch(u8OptId)
596	{
597	case RTNET_DHCP_OPT_DNS:
598	m->m_nameservers.push_back(address);
599	break;
600	case RTNET_DHCP_OPT_ROUTERS:
601	m->m_routers.push_back(address);
602	break;
603	default:
604	Log(("dhcp-opt: list (%d) unsupported\n", u8OptId));
605	}
606	return VINF_SUCCESS;
607	}
608
609
610	int ConfigurationManager::flushAddressList(uint8_t u8OptId)
611	{
612	switch(u8OptId)
613	{
614	case RTNET_DHCP_OPT_DNS:
615	m->m_nameservers.clear();
616	break;
617	case RTNET_DHCP_OPT_ROUTERS:
618	m->m_routers.clear();
619	break;
620	default:
621	Log(("dhcp-opt: list (%d) unsupported\n", u8OptId));
622	}
623	return VINF_SUCCESS;
624	}
625
626
627	const Ipv4AddressContainer& ConfigurationManager::getAddressList(uint8_t u8OptId)
628	{
629	switch(u8OptId)
630	{
631	case RTNET_DHCP_OPT_DNS:
632	return m->m_nameservers;
633
634	case RTNET_DHCP_OPT_ROUTERS:
635	return m->m_routers;
636
637	}
638	/* XXX: Grrr !!! */
639	return m_empty;
640	}
641
642
643	int ConfigurationManager::setString(uint8_t u8OptId, const std::string& str)
644	{
645	switch (u8OptId)
646	{
647	case RTNET_DHCP_OPT_DOMAIN_NAME:
648	m->m_domainName = str;
649	break;
650	default:
651	break;
652	}
653
654	return VINF_SUCCESS;
655	}
656
657
658	const std::string &ConfigurationManager::getString(uint8_t u8OptId)
659	{
660	switch (u8OptId)
661	{
662	case RTNET_DHCP_OPT_DOMAIN_NAME:
663	if (m->m_domainName.length())
664	return m->m_domainName;
665	return m_noString;
666	default:
667	break;
668	}
669
670	return m_noString;
671	}
672
673
674	void ConfigurationManager::init()
675	{
676	m = new ConfigurationManager::Data();
677	}
678
679
680	ConfigurationManager::~ConfigurationManager() { if (m) delete m; }
681
682	/**
683	* Network manager
684	*/
685	struct NetworkManager::Data
686	{
687	Data()
688	{
689	RT_ZERO(BootPReplyMsg);
690	cbBooPReplyMsg = 0;
691
692	m_OurAddress.u = 0;
693	m_OurNetmask.u = 0;
694	RT_ZERO(m_OurMac);
695	}
696
697	union {
698	RTNETBOOTP BootPHeader;
699	uint8_t au8Storage[1024];
700	} BootPReplyMsg;
701	int cbBooPReplyMsg;
702
703	RTNETADDRIPV4 m_OurAddress;
704	RTNETADDRIPV4 m_OurNetmask;
705	RTMAC m_OurMac;
706
707	ComPtr<IDHCPServer> m_DhcpServer;
708	const VBoxNetHlpUDPService *m_service;
709	};
710
711
712	NetworkManager::NetworkManager():m(NULL)
713	{
714	m = new NetworkManager::Data();
715	}
716
717
718	NetworkManager::~NetworkManager()
719	{
720	delete m;
721	m = NULL;
722	}
723
724
725	NetworkManager *NetworkManager::getNetworkManager(ComPtr<IDHCPServer> aDhcpServer)
726	{
727	if (!g_NetworkManager)
728	{
729	g_NetworkManager = new NetworkManager();
730	g_NetworkManager->m->m_DhcpServer = aDhcpServer;
731	}
732
733	return g_NetworkManager;
734	}
735
736
737	const RTNETADDRIPV4& NetworkManager::getOurAddress() const
738	{
739	return m->m_OurAddress;
740	}
741
742
743	const RTNETADDRIPV4& NetworkManager::getOurNetmask() const
744	{
745	return m->m_OurNetmask;
746	}
747
748
749	const RTMAC& NetworkManager::getOurMac() const
750	{
751	return m->m_OurMac;
752	}
753
754
755	void NetworkManager::setOurAddress(const RTNETADDRIPV4& aAddress)
756	{
757	m->m_OurAddress = aAddress;
758	}
759
760
761	void NetworkManager::setOurNetmask(const RTNETADDRIPV4& aNetmask)
762	{
763	m->m_OurNetmask = aNetmask;
764	}
765
766
767	void NetworkManager::setOurMac(const RTMAC& aMac)
768	{
769	m->m_OurMac = aMac;
770	}
771
772
773	void NetworkManager::setService(const VBoxNetHlpUDPService *srv)
774	{
775	m->m_service = srv;
776	}
777
778	/**
779	* Network manager creates DHCPOFFER datagramm
780	*/
781	int NetworkManager::offer4Client(const Client& client, uint32_t u32Xid,
782	uint8_t *pu8ReqList, int cReqList)
783	{
784	Lease l(client); /* XXX: oh, it looks badly, but now we have lease */
785	prepareReplyPacket4Client(client, u32Xid);
786
787	RTNETADDRIPV4 address = l.getAddress();
788	m->BootPReplyMsg.BootPHeader.bp_yiaddr = address;
789
790	/* Ubuntu ???*/
791	m->BootPReplyMsg.BootPHeader.bp_ciaddr = address;
792
793	/* options:
794	* - IP lease time
795	* - message type
796	* - server identifier
797	*/
798	RawOption opt;
799	RT_ZERO(opt);
800
801	std::vector<RawOption> extra;
802	opt.u8OptId = RTNET_DHCP_OPT_MSG_TYPE;
803	opt.au8RawOpt[0] = RTNET_DHCP_MT_OFFER;
804	opt.cbRawOpt = 1;
805	extra.push_back(opt);
806
807	opt.u8OptId = RTNET_DHCP_OPT_LEASE_TIME;
808
809	const NetworkConfigEntity *pCfg = l.getConfig();
810	AssertPtr(pCfg);
811
812	(uint32_t )opt.au8RawOpt = RT_H2N_U32(pCfg->expirationPeriod());
813	opt.cbRawOpt = sizeof(RTNETADDRIPV4);
814
815	extra.push_back(opt);
816
817	processParameterReqList(client, pu8ReqList, cReqList, extra);
818
819	return doReply(client, extra);
820	}
821
822	/**
823	* Network manager creates DHCPACK
824	*/
825	int NetworkManager::ack(const Client& client, uint32_t u32Xid,
826	uint8_t *pu8ReqList, int cReqList)
827	{
828	RTNETADDRIPV4 address;
829
830	prepareReplyPacket4Client(client, u32Xid);
831
832	Lease l = client.lease();
833	address = l.getAddress();
834	m->BootPReplyMsg.BootPHeader.bp_ciaddr = address;
835
836
837	/* rfc2131 4.3.1 is about DHCPDISCOVER and this value is equal to ciaddr from
838	* DHCPREQUEST or 0 ...
839	* XXX: Using addressHint is not correct way to initialize [cy]iaddress...
840	*/
841	m->BootPReplyMsg.BootPHeader.bp_ciaddr = address;
842	m->BootPReplyMsg.BootPHeader.bp_yiaddr = address;
843
844	Assert(m->BootPReplyMsg.BootPHeader.bp_yiaddr.u);
845
846	/* options:
847	* - IP address lease time (if DHCPREQUEST)
848	* - message type
849	* - server identifier
850	*/
851	RawOption opt;
852	RT_ZERO(opt);
853
854	std::vector<RawOption> extra;
855	opt.u8OptId = RTNET_DHCP_OPT_MSG_TYPE;
856	opt.au8RawOpt[0] = RTNET_DHCP_MT_ACK;
857	opt.cbRawOpt = 1;
858	extra.push_back(opt);
859
860	/*
861	* XXX: lease time should be conditional. If on dhcprequest then tim should be provided,
862	* else on dhcpinform it mustn't.
863	*/
864	opt.u8OptId = RTNET_DHCP_OPT_LEASE_TIME;
865	(uint32_t )opt.au8RawOpt = RT_H2N_U32(l.getExpiration());
866	opt.cbRawOpt = sizeof(RTNETADDRIPV4);
867	extra.push_back(opt);
868
869	processParameterReqList(client, pu8ReqList, cReqList, extra);
870
871	return doReply(client, extra);
872	}
873
874	/**
875	* Network manager creates DHCPNAK
876	*/
877	int NetworkManager::nak(const Client& client, uint32_t u32Xid)
878	{
879
880	Lease l = client.lease();
881	if (l == Lease::NullLease)
882	return VERR_INTERNAL_ERROR;
883
884	prepareReplyPacket4Client(client, u32Xid);
885
886	/* this field filed in prepareReplyPacket4Session, and
887	* RFC 2131 require to have it zero fo NAK.
888	*/
889	m->BootPReplyMsg.BootPHeader.bp_yiaddr.u = 0;
890
891	/* options:
892	* - message type (if DHCPREQUEST)
893	* - server identifier
894	*/
895	RawOption opt;
896	std::vector<RawOption> extra;
897
898	opt.u8OptId = RTNET_DHCP_OPT_MSG_TYPE;
899	opt.au8RawOpt[0] = RTNET_DHCP_MT_NAC;
900	opt.cbRawOpt = 1;
901	extra.push_back(opt);
902
903	return doReply(client, extra);
904	}
905
906	/**
907	*
908	*/
909	int NetworkManager::prepareReplyPacket4Client(const Client& client, uint32_t u32Xid)
910	{
911	RT_ZERO(m->BootPReplyMsg);
912
913	m->BootPReplyMsg.BootPHeader.bp_op = RTNETBOOTP_OP_REPLY;
914	m->BootPReplyMsg.BootPHeader.bp_htype = RTNET_ARP_ETHER;
915	m->BootPReplyMsg.BootPHeader.bp_hlen = sizeof(RTMAC);
916	m->BootPReplyMsg.BootPHeader.bp_hops = 0;
917	m->BootPReplyMsg.BootPHeader.bp_xid = u32Xid;
918	m->BootPReplyMsg.BootPHeader.bp_secs = 0;
919	/* XXX: bp_flags should be processed specially */
920	m->BootPReplyMsg.BootPHeader.bp_flags = 0;
921	m->BootPReplyMsg.BootPHeader.bp_ciaddr.u = 0;
922	m->BootPReplyMsg.BootPHeader.bp_giaddr.u = 0;
923
924	m->BootPReplyMsg.BootPHeader.bp_chaddr.Mac = client.getMacAddress();
925
926	const Lease l = client.lease();
927	m->BootPReplyMsg.BootPHeader.bp_yiaddr = l.getAddress();
928	m->BootPReplyMsg.BootPHeader.bp_siaddr.u = 0;
929
930
931	m->BootPReplyMsg.BootPHeader.bp_vend.Dhcp.dhcp_cookie = RT_H2N_U32_C(RTNET_DHCP_COOKIE);
932
933	memset(&m->BootPReplyMsg.BootPHeader.bp_vend.Dhcp.dhcp_opts[0],
934	'\0',
935	RTNET_DHCP_OPT_SIZE);
936
937	return VINF_SUCCESS;
938	}
939
940
941	int NetworkManager::doReply(const Client& client, const std::vector<RawOption>& extra)
942	{
943	int rc;
944
945	/*
946	Options....
947	*/
948	VBoxNetDhcpWriteCursor Cursor(&m->BootPReplyMsg.BootPHeader, RTNET_DHCP_NORMAL_SIZE);
949
950	/* The basics */
951
952	Cursor.optIPv4Addr(RTNET_DHCP_OPT_SERVER_ID, m->m_OurAddress);
953
954	const Lease l = client.lease();
955	const std::map<uint8_t, RawOption>& options = l.options();
956
957	for(std::vector<RawOption>::const_iterator it = extra.begin();
958	it != extra.end(); ++it)
959	{
960	if (!Cursor.begin(it->u8OptId, it->cbRawOpt))
961	break;
962	Cursor.put(it->au8RawOpt, it->cbRawOpt);
963
964	}
965
966	for(std::map<uint8_t, RawOption>::const_iterator it = options.begin();
967	it != options.end(); ++it)
968	{
969	if (!Cursor.begin(it->second.u8OptId, it->second.cbRawOpt))
970	break;
971	Cursor.put(it->second.au8RawOpt, it->second.cbRawOpt);
972
973	}
974
975	Cursor.optEnd();
976
977	/*
978	*/
979	#if 0
980	/** @todo need to see someone set this flag to check that it's correct. */
981	if (!(pDhcpMsg->bp_flags & RTNET_DHCP_FLAGS_NO_BROADCAST))
982	{
983	rc = VBoxNetUDPUnicast(m_pSession,
984	m_hIf,
985	m_pIfBuf,
986	m_OurAddress,
987	&m_OurMac,
988	RTNETIPV4_PORT_BOOTPS, /* sender */
989	IPv4AddrBrdCast,
990	&BootPReplyMsg.BootPHeader->bp_chaddr.Mac,
991	RTNETIPV4_PORT_BOOTPC, /* receiver */
992	&BootPReplyMsg, cbBooPReplyMsg);
993	}
994	else
995	#endif
996	rc = m->m_service->hlpUDPBroadcast(RTNETIPV4_PORT_BOOTPS, /* sender */
997	RTNETIPV4_PORT_BOOTPC,
998	&m->BootPReplyMsg,
999	RTNET_DHCP_NORMAL_SIZE);
1000
1001	AssertRCReturn(rc,rc);
1002
1003	return VINF_SUCCESS;
1004	}
1005
1006
1007	/*
1008	* XXX: TODO: Share decoding code with DHCPServer::addOption.
1009	*/
1010	static int parseDhcpOptionText(const char *pszText,
1011	int pOptCode, char ppszOptText, int pOptEncoding)
1012	{
1013	uint8_t u8Code;
1014	uint32_t u32Enc;
1015	char *pszNext;
1016	int rc;
1017
1018	rc = RTStrToUInt8Ex(pszText, &pszNext, 10, &u8Code);
1019	if (!RT_SUCCESS(rc))
1020	return VERR_PARSE_ERROR;
1021
1022	switch (*pszNext)
1023	{
1024	case ':': /* support legacy format too */
1025	{
1026	u32Enc = 0;
1027	break;
1028	}
1029
1030	case '=':
1031	{
1032	u32Enc = 1;
1033	break;
1034	}
1035
1036	case '@':
1037	{
1038	rc = RTStrToUInt32Ex(pszNext + 1, &pszNext, 10, &u32Enc);
1039	if (!RT_SUCCESS(rc))
1040	return VERR_PARSE_ERROR;
1041	if (*pszNext != '=')
1042	return VERR_PARSE_ERROR;
1043	break;
1044	}
1045
1046	default:
1047	return VERR_PARSE_ERROR;
1048	}
1049
1050	*pOptCode = u8Code;
1051	*ppszOptText = pszNext + 1;
1052	*pOptEncoding = (int)u32Enc;
1053
1054	return VINF_SUCCESS;
1055	}
1056
1057
1058	static int fillDhcpOption(RawOption &opt, const std::string &OptText, int OptEncoding)
1059	{
1060	int rc;
1061
1062	if (OptEncoding == DhcpOptEncoding_Hex)
1063	{
1064	if (OptText.empty())
1065	return VERR_INVALID_PARAMETER;
1066
1067	size_t cbRawOpt = 0;
1068	char pszNext = const_cast<char >(OptText.c_str());
1069	while (*pszNext != '\0')
1070	{
1071	if (cbRawOpt >= RT_ELEMENTS(opt.au8RawOpt))
1072	return VERR_INVALID_PARAMETER;
1073
1074	uint8_t u8Byte;
1075	rc = RTStrToUInt8Ex(pszNext, &pszNext, 16, &u8Byte);
1076	if (!RT_SUCCESS(rc))
1077	return rc;
1078
1079	if (*pszNext == ':')
1080	++pszNext;
1081	else if (*pszNext != '\0')
1082	return VERR_PARSE_ERROR;
1083
1084	opt.au8RawOpt[cbRawOpt] = u8Byte;
1085	++cbRawOpt;
1086	}
1087	opt.cbRawOpt = (uint8_t)cbRawOpt;
1088	}
1089	else if (OptEncoding == DhcpOptEncoding_Legacy)
1090	{
1091	/*
1092	* XXX: TODO: encode "known" option opt.u8OptId
1093	*/
1094	return VERR_INVALID_PARAMETER;
1095	}
1096
1097	return VINF_SUCCESS;
1098	}
1099
1100
1101	int NetworkManager::processParameterReqList(const Client& client, const uint8_t *pu8ReqList,
1102	int cReqList, std::vector<RawOption>& extra)
1103	{
1104	int rc;
1105
1106	const Lease l = client.lease();
1107
1108	const NetworkConfigEntity *pNetCfg = l.getConfig();
1109
1110	/*
1111	* XXX: Brute-force. Unfortunately, there's no notification event
1112	* for changes. Should at least cache the options for a short
1113	* time, enough to last discover/offer/request/ack cycle.
1114	*/
1115	typedef std::map< int, std::pair<std::string, int> > DhcpOptionMap;
1116	DhcpOptionMap OptMap;
1117
1118	if (!m->m_DhcpServer.isNull())
1119	{
1120	com::SafeArray<BSTR> strings;
1121	com::Bstr str;
1122	HRESULT hrc;
1123	int OptCode, OptEncoding;
1124	char *pszOptText;
1125
1126	strings.setNull();
1127	hrc = m->m_DhcpServer->COMGETTER(GlobalOptions)(ComSafeArrayAsOutParam(strings));
1128	AssertComRC(hrc);
1129	for (size_t i = 0; i < strings.size(); ++i)
1130	{
1131	com::Utf8Str encoded(strings[i]);
1132	rc = parseDhcpOptionText(encoded.c_str(),
1133	&OptCode, &pszOptText, &OptEncoding);
1134	if (!RT_SUCCESS(rc))
1135	continue;
1136
1137	OptMap[OptCode] = std::make_pair(pszOptText, OptEncoding);
1138	}
1139
1140	const RTMAC &mac = client.getMacAddress();
1141	char strMac[6*2+1] = "";
1142	RTStrPrintf(strMac, sizeof(strMac), "%02x%02x%02x%02x%02x%02x",
1143	mac.au8[0], mac.au8[1], mac.au8[2],
1144	mac.au8[3], mac.au8[4], mac.au8[5]);
1145
1146	strings.setNull();
1147	hrc = m->m_DhcpServer->GetMacOptions(com::Bstr(strMac).raw(),
1148	ComSafeArrayAsOutParam(strings));
1149	AssertComRC(hrc);
1150	for (size_t i = 0; i < strings.size(); ++i)
1151	{
1152	com::Utf8Str text(strings[i]);
1153	rc = parseDhcpOptionText(text.c_str(),
1154	&OptCode, &pszOptText, &OptEncoding);
1155	if (!RT_SUCCESS(rc))
1156	continue;
1157
1158	OptMap[OptCode] = std::make_pair(pszOptText, OptEncoding);
1159	}
1160	}
1161
1162	/* request parameter list */
1163	RawOption opt;
1164	bool fIgnore;
1165	uint8_t u8Req;
1166	for (int idxParam = 0; idxParam < cReqList; ++idxParam)
1167	{
1168	fIgnore = false;
1169	RT_ZERO(opt);
1170	u8Req = opt.u8OptId = pu8ReqList[idxParam];
1171
1172	switch(u8Req)
1173	{
1174	case RTNET_DHCP_OPT_SUBNET_MASK:
1175	((PRTNETADDRIPV4)opt.au8RawOpt)->u = pNetCfg->netmask().u;
1176	opt.cbRawOpt = sizeof(RTNETADDRIPV4);
1177
1178	break;
1179
1180	case RTNET_DHCP_OPT_ROUTERS:
1181	case RTNET_DHCP_OPT_DNS:
1182	{
1183	const Ipv4AddressContainer lst =
1184	g_ConfigurationManager->getAddressList(u8Req);
1185	PRTNETADDRIPV4 pAddresses = (PRTNETADDRIPV4)&opt.au8RawOpt[0];
1186
1187	for (Ipv4AddressConstIterator it = lst.begin();
1188	it != lst.end();
1189	++it)
1190	{
1191	pAddresses = (it);
1192	pAddresses++;
1193	opt.cbRawOpt += sizeof(RTNETADDRIPV4);
1194	}
1195
1196	if (lst.empty())
1197	fIgnore = true;
1198	}
1199	break;
1200	case RTNET_DHCP_OPT_DOMAIN_NAME:
1201	{
1202	std::string domainName = g_ConfigurationManager->getString(u8Req);
1203	if (domainName == g_ConfigurationManager->m_noString)
1204	{
1205	fIgnore = true;
1206	break;
1207	}
1208
1209	size_t cchLength = domainName.length();
1210	if (cchLength >= sizeof(opt.au8RawOpt))
1211	cchLength = sizeof(opt.au8RawOpt) - 1;
1212	memcpy(&opt.au8RawOpt[0], domainName.c_str(), cchLength);
1213	opt.au8RawOpt[cchLength] = '\0';
1214	opt.cbRawOpt = (uint8_t)cchLength;
1215	}
1216	break;
1217	default:
1218	{
1219	DhcpOptionMap::const_iterator it = OptMap.find((int)u8Req);
1220	if (it == OptMap.end())
1221	{
1222	Log(("opt: %d is ignored\n", u8Req));
1223	fIgnore = true;
1224	}
1225	else
1226	{
1227	std::string OptText((*it).second.first);
1228	int OptEncoding((*it).second.second);
1229
1230	rc = fillDhcpOption(opt, OptText, OptEncoding);
1231	if (!RT_SUCCESS(rc))
1232	{
1233	fIgnore = true;
1234	break;
1235	}
1236	}
1237	}
1238	break;
1239	}
1240
1241	if (!fIgnore)
1242	extra.push_back(opt);
1243
1244	}
1245
1246	return VINF_SUCCESS;
1247	}
1248
1249	/* Client */
1250	Client::Client()
1251	{
1252	m = SharedPtr<ClientData>();
1253	}
1254
1255
1256	void Client::initWithMac(const RTMAC& mac)
1257	{
1258	m = SharedPtr<ClientData>(new ClientData());
1259	m->m_mac = mac;
1260	}
1261
1262
1263	bool Client::operator== (const RTMAC& mac) const
1264	{
1265	return (m.get() && m->m_mac == mac);
1266	}
1267
1268
1269	const RTMAC& Client::getMacAddress() const
1270	{
1271	return m->m_mac;
1272	}
1273
1274
1275	Lease Client::lease()
1276	{
1277	if (!m.get()) return Lease::NullLease;
1278
1279	if (m->fHasLease)
1280	return Lease(*this);
1281	else
1282	return Lease::NullLease;
1283	}
1284
1285
1286	const Lease Client::lease() const
1287	{
1288	return const_cast<Client *>(this)->lease();
1289	}
1290
1291
1292	Client::Client(ClientData *data):m(SharedPtr<ClientData>(data)){}
1293
1294	/* Lease */
1295	Lease::Lease()
1296	{
1297	m = SharedPtr<ClientData>();
1298	}
1299
1300
1301	Lease::Lease (const Client& c)
1302	{
1303	m = SharedPtr<ClientData>(c.m);
1304	if ( !m->fHasLease
1305	\|\| ( isExpired()
1306	&& !isInBindingPhase()))
1307	{
1308	m->fHasLease = true;
1309	m->fBinding = true;
1310	phaseStart(RTTimeMilliTS());
1311	}
1312	}
1313
1314
1315	bool Lease::isExpired() const
1316	{
1317	AssertPtrReturn(m.get(), false);
1318
1319	if (!m->fBinding)
1320	return (ASMDivU64ByU32RetU32(RTTimeMilliTS() - m->u64TimestampLeasingStarted, 1000)
1321	> m->u32LeaseExpirationPeriod);
1322	else
1323	return (ASMDivU64ByU32RetU32(RTTimeMilliTS() - m->u64TimestampBindingStarted, 1000)
1324	> m->u32BindExpirationPeriod);
1325	}
1326
1327
1328	void Lease::expire()
1329	{
1330	/* XXX: TODO */
1331	}
1332
1333
1334	void Lease::phaseStart(uint64_t u64Start)
1335	{
1336	if (m->fBinding)
1337	m->u64TimestampBindingStarted = u64Start;
1338	else
1339	m->u64TimestampLeasingStarted = u64Start;
1340	}
1341
1342
1343	void Lease::bindingPhase(bool fOnOff)
1344	{
1345	m->fBinding = fOnOff;
1346	}
1347
1348
1349	bool Lease::isInBindingPhase() const
1350	{
1351	return m->fBinding;
1352	}
1353
1354
1355	uint64_t Lease::issued() const
1356	{
1357	return m->u64TimestampLeasingStarted;
1358	}
1359
1360
1361	void Lease::setExpiration(uint32_t exp)
1362	{
1363	if (m->fBinding)
1364	m->u32BindExpirationPeriod = exp;
1365	else
1366	m->u32LeaseExpirationPeriod = exp;
1367	}
1368
1369
1370	uint32_t Lease::getExpiration() const
1371	{
1372	if (m->fBinding)
1373	return m->u32BindExpirationPeriod;
1374	else
1375	return m->u32LeaseExpirationPeriod;
1376	}
1377
1378
1379	RTNETADDRIPV4 Lease::getAddress() const
1380	{
1381	return m->m_address;
1382	}
1383
1384
1385	void Lease::setAddress(RTNETADDRIPV4 address)
1386	{
1387	m->m_address = address;
1388	}
1389
1390
1391	const NetworkConfigEntity *Lease::getConfig() const
1392	{
1393	return m->pCfg;
1394	}
1395
1396
1397	void Lease::setConfig(NetworkConfigEntity *pCfg)
1398	{
1399	m->pCfg = pCfg;
1400	}
1401
1402
1403	const MapOptionId2RawOption& Lease::options() const
1404	{
1405	return m->options;
1406	}
1407
1408
1409	Lease::Lease(ClientData *pd):m(SharedPtr<ClientData>(pd)){}
1410
1411
1412	bool Lease::toXML(xml::ElementNode *node) const
1413	{
1414	xml::AttributeNode *pAttribNode = node->setAttribute(tagXMLLeaseAttributeMac.c_str(),
1415	com::Utf8StrFmt("%RTmac", &m->m_mac));
1416	if (!pAttribNode)
1417	return false;
1418
1419	pAttribNode = node->setAttribute(tagXMLLeaseAttributeNetwork.c_str(),
1420	com::Utf8StrFmt("%RTnaipv4", m->m_network));
1421	if (!pAttribNode)
1422	return false;
1423
1424	xml::ElementNode *pLeaseAddress = node->createChild(tagXMLLeaseAddress.c_str());
1425	if (!pLeaseAddress)
1426	return false;
1427
1428	pAttribNode = pLeaseAddress->setAttribute(tagXMLAddressAttributeValue.c_str(),
1429	com::Utf8StrFmt("%RTnaipv4", m->m_address));
1430	if (!pAttribNode)
1431	return false;
1432
1433	xml::ElementNode *pLeaseTime = node->createChild(tagXMLLeaseTime.c_str());
1434	if (!pLeaseTime)
1435	return false;
1436
1437	pAttribNode = pLeaseTime->setAttribute(tagXMLTimeAttributeIssued.c_str(),
1438	m->u64TimestampLeasingStarted);
1439	if (!pAttribNode)
1440	return false;
1441
1442	pAttribNode = pLeaseTime->setAttribute(tagXMLTimeAttributeExpiration.c_str(),
1443	m->u32LeaseExpirationPeriod);
1444	if (!pAttribNode)
1445	return false;
1446
1447	return true;
1448	}
1449
1450
1451	bool Lease::fromXML(const xml::ElementNode *node)
1452	{
1453	com::Utf8Str mac;
1454	bool valueExists = node->getAttributeValue(tagXMLLeaseAttributeMac.c_str(), mac);
1455	if (!valueExists) return false;
1456	int rc = RTNetStrToMacAddr(mac.c_str(), &m->m_mac);
1457	if (RT_FAILURE(rc)) return false;
1458
1459	com::Utf8Str network;
1460	valueExists = node->getAttributeValue(tagXMLLeaseAttributeNetwork.c_str(), network);
1461	if (!valueExists) return false;
1462	rc = RTNetStrToIPv4Addr(network.c_str(), &m->m_network);
1463	if (RT_FAILURE(rc)) return false;
1464
1465	/* Address */
1466	const xml::ElementNode *address = node->findChildElement(tagXMLLeaseAddress.c_str());
1467	if (!address) return false;
1468	com::Utf8Str addressValue;
1469	valueExists = address->getAttributeValue(tagXMLAddressAttributeValue.c_str(), addressValue);
1470	if (!valueExists) return false;
1471	rc = RTNetStrToIPv4Addr(addressValue.c_str(), &m->m_address);
1472
1473	/* Time */
1474	const xml::ElementNode *time = node->findChildElement(tagXMLLeaseTime.c_str());
1475	if (!time) return false;
1476
1477	valueExists = time->getAttributeValue(tagXMLTimeAttributeIssued.c_str(),
1478	&m->u64TimestampLeasingStarted);
1479	if (!valueExists) return false;
1480	m->fBinding = false;
1481
1482	valueExists = time->getAttributeValue(tagXMLTimeAttributeExpiration.c_str(),
1483	&m->u32LeaseExpirationPeriod);
1484	if (!valueExists) return false;
1485
1486	m->fHasLease = true;
1487	return true;
1488	}
1489
1490
1491	const Lease Lease::NullLease;
1492
1493	const Client Client::NullClient;

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source: vbox/trunk/src/VBox/NetworkServices/DHCP/Config.cpp@ 79524

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