[ViewVC] Diff of: cvs/gvpe/src/connection.C

Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.43 by pcg, Fri Mar 4 04:52:38 2005 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	extern "C" {	24	#include <cassert>
22	# include "lzf/lzf.h"
23	}
24		25
25	#include <list>	26	#include <list>
		27
		28	#include <openssl/rand.h>
		29	#include <openssl/evp.h>
		30	#include <openssl/rsa.h>
		31	#include <openssl/err.h>
26		32
27	#include "gettext.h"	33	#include "gettext.h"
28		34
29	#include "conf.h"	35	#include "conf.h"
30	#include "slog.h"	36	#include "slog.h"
31	#include "device.h"	37	#include "device.h"
32	#include "protocol.h"	38	#include "vpn.h"
33	#include "connection.h"	39	#include "connection.h"
		40
		41	#include "netcompat.h"
34		42
35	#if !HAVE_RAND_PSEUDO_BYTES	43	#if !HAVE_RAND_PSEUDO_BYTES
36	# define RAND_pseudo_bytes RAND_bytes	44	# define RAND_pseudo_bytes RAND_bytes
37	#endif	45	#endif
38		46
39	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
		48
		49	#define ULTRA_FAST 1
		50	#define HLOG 15
		51	#include "lzf/lzf.h"
		52	#include "lzf/lzf_c.c"
		53	#include "lzf/lzf_d.c"
40		54
41	struct crypto_ctx	55	struct crypto_ctx
42	{	56	{
43	EVP_CIPHER_CTX cctx;	57	EVP_CIPHER_CTX cctx;
44	HMAC_CTX hctx;	58	HMAC_CTX hctx;
48	};	62	};
49		63
50	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	64	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
51	{	65	{
52	EVP_CIPHER_CTX_init (&cctx);	66	EVP_CIPHER_CTX_init (&cctx);
53	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	67	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
54	HMAC_CTX_init (&hctx);	68	HMAC_CTX_init (&hctx);
55	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
56	}	70	}
57		71
58	crypto_ctx::~crypto_ctx ()	72	crypto_ctx::~crypto_ctx ()
59	{	73	{
60	EVP_CIPHER_CTX_cleanup (&cctx);	74	require (EVP_CIPHER_CTX_cleanup (&cctx));
61	HMAC_CTX_cleanup (&hctx);	75	HMAC_CTX_cleanup (&hctx);
62	}	76	}
63		77
64	static void	78	static void
65	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
66	{	80	{
67	EVP_MD_CTX ctx;	81	EVP_MD_CTX ctx;
68		82
69	EVP_MD_CTX_init (&ctx);	83	EVP_MD_CTX_init (&ctx);
70	EVP_DigestInit (&ctx, RSA_HASH);	84	require (EVP_DigestInit (&ctx, RSA_HASH));
71	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
72	EVP_DigestUpdate(&ctx, &id, sizeof id);	86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
73	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
74	EVP_MD_CTX_cleanup (&ctx);	88	EVP_MD_CTX_cleanup (&ctx);
75	}	89	}
76		90
77	struct rsa_entry {	91	struct rsa_entry {
78	tstamp expire;	92	tstamp expire;
…		…
80	rsachallenge chg;	94	rsachallenge chg;
81	};	95	};
82		96
83	struct rsa_cache : list<rsa_entry>	97	struct rsa_cache : list<rsa_entry>
84	{	98	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	99	void cleaner_cb (time_watcher &w); time_watcher cleaner;
86		100
87	bool find (const rsaid &id, rsachallenge &chg)	101	bool find (const rsaid &id, rsachallenge &chg)
88	{	102	{
89	for (iterator i = begin (); i != end (); ++i)	103	for (iterator i = begin (); i != end (); ++i)
90	{	104	{
…		…
124	: cleaner (this, &rsa_cache::cleaner_cb)	138	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	139	{ }
126		140
127	} rsa_cache;	141	} rsa_cache;
128		142
129	void rsa_cache::cleaner_cb (tstamp &ts)	143	void rsa_cache::cleaner_cb (time_watcher &w)
130	{	144	{
131	if (empty ())	145	if (!empty ())
132	ts = TSTAMP_CANCEL;
133	else
134	{	146	{
135	ts = NOW + RSA_TTL;	147	w.start (NOW + RSA_TTL);
136		148
137	for (iterator i = begin (); i != end (); )	149	for (iterator i = begin (); i != end (); )
138	if (i->expire <= NOW)	150	if (i->expire <= NOW)
139	i = erase (i);	151	i = erase (i);
140	else	152	else
…		…
142	}	154	}
143	}	155	}
144		156
145	//////////////////////////////////////////////////////////////////////////////	157	//////////////////////////////////////////////////////////////////////////////
146		158
147	void pkt_queue::put (tap_packet *p)	159	void pkt_queue::put (net_packet *p)
148	{	160	{
149	if (queue[i])	161	if (queue[i])
150	{	162	{
151	delete queue[i];	163	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;	164	j = (j + 1) % QUEUEDEPTH;
…		…
155	queue[i] = p;	167	queue[i] = p;
156		168
157	i = (i + 1) % QUEUEDEPTH;	169	i = (i + 1) % QUEUEDEPTH;
158	}	170	}
159		171
160	tap_packet *pkt_queue::get ()	172	net_packet *pkt_queue::get ()
161	{	173	{
162	tap_packet *p = queue[j];	174	net_packet *p = queue[j];
163		175
164	if (p)	176	if (p)
165	{	177	{
166	queue[j] = 0;	178	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;	179	j = (j + 1) % QUEUEDEPTH;
…		…
192	// only do action once every x seconds per host whole allowing bursts.	204	// only do action once every x seconds per host whole allowing bursts.
193	// this implementation ("splay list" ;) is inefficient,	205	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	206	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	207	struct net_rate_limiter : list<net_rateinfo>
196	{	208	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	209	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	210	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
199	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	211	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		212	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
200		213
201	bool can (const sockinfo &si) { return can((u32)si.host); }	214	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	215	bool can (u32 host);
203	};	216	};
204		217
205	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206		219
…		…
209	iterator i;	222	iterator i;
210		223
211	for (i = begin (); i != end (); )	224	for (i = begin (); i != end (); )
212	if (i->host == host)	225	if (i->host == host)
213	break;	226	break;
214	else if (i->last < NOW - EXPIRE)	227	else if (i->last < NOW - NRL_EXPIRE)
215	i = erase (i);	228	i = erase (i);
216	else	229	else
217	i++;	230	i++;
218		231
219	if (i == end ())	232	if (i == end ())
220	{	233	{
221	net_rateinfo ri;	234	net_rateinfo ri;
222		235
223	ri.host = host;	236	ri.host = host;
224	ri.pcnt = 1.;	237	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	238	ri.diff = NRL_MAXDIF;
226	ri.last = NOW;	239	ri.last = NOW;
227		240
228	push_front (ri);	241	push_front (ri);
229		242
230	return true;	243	return true;
…		…
232	else	245	else
233	{	246	{
234	net_rateinfo ri (*i);	247	net_rateinfo ri (*i);
235	erase (i);	248	erase (i);
236		249
237	ri.pcnt = ri.pcnt * ALPHA;	250	ri.pcnt = ri.pcnt * NRL_ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
239		252
240	ri.last = NOW;	253	ri.last = NOW;
241		254
		255	double dif = ri.diff / ri.pcnt;
		256
242	bool send = ri.diff / ri.pcnt > CUTOFF;	257	bool send = dif > NRL_CUTOFF;
243		258
		259	if (dif > NRL_MAXDIF)
		260	{
		261	ri.pcnt = 1.;
		262	ri.diff = NRL_MAXDIF;
		263	}
244	if (send)	264	else if (send)
245	ri.pcnt++;	265	ri.pcnt++;
246		266
247	push_front (ri);	267	push_front (ri);
248		268
249	return send;	269	return send;
…		…
280	hmac_gen (ctx);	300	hmac_gen (ctx);
281		301
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	302	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	303	}
284		304
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	306	{
287	this->type = type;	307	type = type_;
288		308
289	int src = THISNODE->id;	309	int src = THISNODE->id;
290		310
291	src1 = src;	311	src1 = src;
292	srcdst = ((src >> 8) << 4) \| (dst >> 8);	312	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
294	}	314	}
295		315
296	#define MAXVPNDATA (MAX_MTU - 6 - 6)	316	#define MAXVPNDATA (MAX_MTU - 6 - 6)
297	#define DATAHDR (sizeof (u32) + RAND_SIZE)	317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
298		318
299	struct vpndata_packet:vpn_packet	319	struct vpndata_packet : vpn_packet
300	{	320	{
301	u8 data[MAXVPNDATA + DATAHDR]; // seqno	321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
302		322
303	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	323	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
304	tap_packet unpack (connection conn, u32 &seqno);	324	tap_packet unpack (connection conn, u32 &seqno);
…		…
317	int outl = 0, outl2;	337	int outl = 0, outl2;
318	ptype type = PT_DATA_UNCOMPRESSED;	338	ptype type = PT_DATA_UNCOMPRESSED;
319		339
320	#if ENABLE_COMPRESSION	340	#if ENABLE_COMPRESSION
321	u8 cdata[MAX_MTU];	341	u8 cdata[MAX_MTU];
322	u32 cl;
323		342
		343	if (conn->features & ENABLE_COMPRESSION)
		344	{
324	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		346
325	if (cl)	347	if (cl)
326	{	348	{
327	type = PT_DATA_COMPRESSED;	349	type = PT_DATA_COMPRESSED;
328	d = cdata;	350	d = cdata;
329	l = cl + 2;	351	l = cl + 2;
330		352
331	d[0] = cl >> 8;	353	d[0] = cl >> 8;
332	d[1] = cl;	354	d[1] = cl;
		355	}
333	}	356	}
334	#endif	357	#endif
335		358
336	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
337		360
338	struct {	361	struct {
339	#if RAND_SIZE	362	#if RAND_SIZE
340	u8 rnd[RAND_SIZE];	363	u8 rnd[RAND_SIZE];
341	#endif	364	#endif
…		…
345	datahdr.seqno = ntohl (seqno);	368	datahdr.seqno = ntohl (seqno);
346	#if RAND_SIZE	369	#if RAND_SIZE
347	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
348	#endif	371	#endif
349		372
350	EVP_EncryptUpdate (cctx,	373	require (EVP_EncryptUpdate (cctx,
351	(unsigned char *) data + outl, &outl2,	374	(unsigned char *) data + outl, &outl2,
352	(unsigned char *) &datahdr, DATAHDR);	375	(unsigned char *) &datahdr, DATAHDR));
353	outl += outl2;	376	outl += outl2;
354		377
355	EVP_EncryptUpdate (cctx,	378	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	379	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) d, l);	380	(unsigned char *) d, l));
358	outl += outl2;	381	outl += outl2;
359		382
360	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
361	outl += outl2;	384	outl += outl2;
362		385
363	len = outl + data_hdr_size ();	386	len = outl + data_hdr_size ();
364		387
365	set_hdr (type, dst);	388	set_hdr (type, dst);
…		…
374	int outl = 0, outl2;	397	int outl = 0, outl2;
375	tap_packet *p = new tap_packet;	398	tap_packet *p = new tap_packet;
376	u8 *d;	399	u8 *d;
377	u32 l = len - data_hdr_size ();	400	u32 l = len - data_hdr_size ();
378		401
379	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
380		403
381	#if ENABLE_COMPRESSION	404	#if ENABLE_COMPRESSION
382	u8 cdata[MAX_MTU];	405	u8 cdata[MAX_MTU];
383		406
384	if (type == PT_DATA_COMPRESSED)	407	if (type == PT_DATA_COMPRESSED)
…		…
386	else	409	else
387	#endif	410	#endif
388	d = &(*p)[6 + 6 - DATAHDR];	411	d = &(*p)[6 + 6 - DATAHDR];
389		412
390	/* this overwrites part of the src mac, but we fix that later */	413	/* this overwrites part of the src mac, but we fix that later */
391	EVP_DecryptUpdate (cctx,	414	require (EVP_DecryptUpdate (cctx,
392	d, &outl2,	415	d, &outl2,
393	(unsigned char *)&data, len - data_hdr_size ());	416	(unsigned char *)&data, len - data_hdr_size ()));
394	outl += outl2;	417	outl += outl2;
395		418
396	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
397	outl += outl2;	420	outl += outl2;
398		421
399	seqno = ntohl ((u32 )(d + RAND_SIZE));	422	seqno = ntohl ((u32 )(d + RAND_SIZE));
400		423
401	id2mac (dst () ? dst() : THISNODE->id, p->dst);	424	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
430	{	453	{
431	// actually, hmaclen cannot be checked because the hmac	454	// actually, hmaclen cannot be checked because the hmac
432	// field comes before this data, so peers with other	455	// field comes before this data, so peers with other
433	// hmacs simply will not work.	456	// hmacs simply will not work.
434	u8 prot_major, prot_minor, randsize, hmaclen;	457	u8 prot_major, prot_minor, randsize, hmaclen;
435	u8 flags, challengelen, pad2, pad3;	458	u8 flags, challengelen, features, pad3;
436	u32 cipher_nid, digest_nid, hmac_nid;	459	u32 cipher_nid, digest_nid, hmac_nid;
437
438	const u8 curflags () const
439	{
440	return 0x80
441	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
442	}
443		460
444	void setup (ptype type, int dst);	461	void setup (ptype type, int dst);
445	bool chk_config () const;	462	bool chk_config () const;
		463
		464	static u8 get_features ()
		465	{
		466	u8 f = 0;
		467	#if ENABLE_COMPRESSION
		468	f \|= FEATURE_COMPRESSION;
		469	#endif
		470	#if ENABLE_ROHC
		471	f \|= FEATURE_ROHC;
		472	#endif
		473	return f;
		474	}
446	};	475	};
447		476
448	void config_packet::setup (ptype type, int dst)	477	void config_packet::setup (ptype type, int dst)
449	{	478	{
450	prot_major = PROTOCOL_MAJOR;	479	prot_major = PROTOCOL_MAJOR;
451	prot_minor = PROTOCOL_MINOR;	480	prot_minor = PROTOCOL_MINOR;
452	randsize = RAND_SIZE;	481	randsize = RAND_SIZE;
453	hmaclen = HMACLENGTH;	482	hmaclen = HMACLENGTH;
454	flags = curflags ();	483	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
455	challengelen = sizeof (rsachallenge);	484	challengelen = sizeof (rsachallenge);
		485	features = get_features ();
456		486
457	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
458	digest_nid = htonl (EVP_MD_type (RSA_HASH));	488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
459	hmac_nid = htonl (EVP_MD_type (DIGEST));	489	hmac_nid = htonl (EVP_MD_type (DIGEST));
460		490
…		…
462	set_hdr (type, dst);	492	set_hdr (type, dst);
463	}	493	}
464		494
465	bool config_packet::chk_config () const	495	bool config_packet::chk_config () const
466	{	496	{
467	return prot_major == PROTOCOL_MAJOR	497	if (prot_major != PROTOCOL_MAJOR)
468	&& randsize == RAND_SIZE	498	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
469	&& hmaclen == HMACLENGTH	499	else if (randsize != RAND_SIZE)
470	&& flags == curflags ()	500	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		501	else if (hmaclen != HMACLENGTH)
		502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
		503	#if 0 // this implementation should handle all flag settings
		504	else if (flags != curflags ())
		505	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
		506	#endif
471	&& challengelen == sizeof (rsachallenge)	507	else if (challengelen != sizeof (rsachallenge))
		508	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
472	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	509	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		510	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
473	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	511	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		512	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
474	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	513	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		514	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		515	else
		516	return true;
		517
		518	return false;
475	}	519	}
476		520
477	struct auth_req_packet : config_packet	521	struct auth_req_packet : config_packet
478	{	522	{
479	char magic[8];	523	char magic[8];
480	u8 initiate; // false if this is just an automatic reply	524	u8 initiate; // false if this is just an automatic reply
481	u8 protocols; // supported protocols (will get patches on forward)	525	u8 protocols; // supported protocols (will be patched on forward)
482	u8 pad2, pad3;	526	u8 pad2, pad3;
483	rsaid id;	527	rsaid id;
484	rsaencrdata encr;	528	rsaencrdata encr;
485		529
486	auth_req_packet (int dst, bool initiate_, u8 protocols_)	530	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
541	};	585	};
542		586
543	/////////////////////////////////////////////////////////////////////////////	587	/////////////////////////////////////////////////////////////////////////////
544		588
545	void	589	void
		590	connection::connection_established ()
		591	{
		592	if (ictx && octx)
		593	{
		594	connectmode = conf->connectmode;
		595
		596	// make sure rekeying timeouts are slightly asymmetric
		597	rekey.start (NOW + ::conf.rekey
		598	+ (conf->id > THISNODE->id ? 10 : 0));
		599	keepalive.start (NOW + ::conf.keepalive);
		600
		601	// send queued packets
		602	if (ictx && octx)
		603	{
		604	while (tap_packet p = (tap_packet )data_queue.get ())
		605	{
		606	send_data_packet (p);
		607	delete p;
		608	}
		609
		610	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		611	{
		612	send_vpn_packet (p, si, IPTOS_RELIABILITY);
		613	delete p;
		614	}
		615	}
		616	}
		617	else
		618	{
		619	retry_cnt = 0;
		620	establish_connection.start (NOW + 5);
		621	keepalive.stop ();
		622	rekey.stop ();
		623	}
		624	}
		625
		626	void
546	connection::reset_dstaddr ()	627	connection::reset_si ()
547	{	628	{
		629	protocol = best_protocol (THISNODE->protocols & conf->protocols);
		630
		631	// mask out protocols we cannot establish
		632	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
		633	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		634	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
		635
548	si.set (conf);	636	si.set (conf, protocol);
		637	}
		638
		639	// ensure sockinfo is valid, forward if necessary
		640	const sockinfo &
		641	connection::forward_si (const sockinfo &si) const
		642	{
		643	if (!si.valid ())
		644	{
		645	connection *r = vpn->find_router ();
		646
		647	if (r)
		648	{
		649	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),
		650	conf->nodename, r->conf->nodename);
		651	return r->si;
		652	}
		653	else
		654	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
		655	conf->nodename);
		656	}
		657
		658	return si;
		659	}
		660
		661	void
		662	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		663	{
		664	bool ok;
		665
		666	switch (si.prot)
		667	{
		668	case PROT_IPv4:
		669	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
		670	case PROT_UDPv4:
		671	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
		672	#if ENABLE_TCP
		673	case PROT_TCPv4:
		674	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
		675	#endif
		676	#if ENABLE_ICMP
		677	case PROT_ICMPv4:
		678	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
		679	#endif
		680	#if ENABLE_DNS
		681	case PROT_DNSv4:
		682	ok = send_dnsv4_packet (pkt, si, tos); break;
		683	#endif
		684
		685	default:
		686	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		687	ok = false;
		688	}
		689
		690	if (!ok)
		691	reset_connection ();
549	}	692	}
550		693
551	void	694	void
552	connection::send_ping (const sockinfo &si, u8 pong)	695	connection::send_ping (const sockinfo &si, u8 pong)
553	{	696	{
…		…
576	void	719	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	720	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	721	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	722	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580		723
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);
582
583	rsachallenge chg;	724	rsachallenge chg;
584
585	rsa_cache.gen (pkt->id, chg);	725	rsa_cache.gen (pkt->id, chg);
586		726	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
587	if (0 > RSA_public_encrypt (sizeof chg,
588	(unsigned char )&chg, (unsigned char )&pkt->encr,
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");
591		727
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	728	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
593		729
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	730	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
595		731
596	delete pkt;	732	delete pkt;
597	}	733	}
598		734
599	void	735	void
…		…
627		763
628	delete r;	764	delete r;
629	}	765	}
630		766
631	void	767	void
632	connection::establish_connection_cb (tstamp &ts)	768	connection::establish_connection_cb (time_watcher &w)
633	{	769	{
634	if (ictx \|\| conf == THISNODE	770	if (!ictx
		771	&& conf != THISNODE
635	\|\| connectmode == conf_node::C_NEVER	772	&& connectmode != conf_node::C_NEVER
636	\|\| connectmode == conf_node::C_DISABLED)	773	&& connectmode != conf_node::C_DISABLED
637	ts = TSTAMP_CANCEL;	774	&& NOW > w.at)
638	else if (ts <= NOW)
639	{	775	{
640	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	776	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
641		777
642	if (retry_int < 3600 * 8)	778	if (retry_int < conf->max_retry)
643	retry_cnt++;	779	retry_cnt++;
		780	else
		781	retry_int = conf->max_retry;
644		782
645	ts = NOW + retry_int;	783	w.start (NOW + retry_int);
646		784
647	if (conf->hostname)	785	reset_si ();
		786
		787	if (si.prot && !si.host)
		788	vpn->send_connect_request (conf->id);
		789	else
648	{	790	{
649	reset_dstaddr ();	791	const sockinfo &dsi = forward_si (si);
		792
650	if (si.host && auth_rate_limiter.can (si))	793	if (dsi.valid () && auth_rate_limiter.can (dsi))
651	{	794	{
652	if (retry_cnt < 4)	795	if (retry_cnt < 4)
653	send_auth_request (si, true);	796	send_auth_request (dsi, true);
654	else	797	else
655	send_ping (si, 0);	798	send_ping (dsi, 0);
656	}	799	}
657	}	800	}
658	else
659	vpn->connect_request (conf->id);
660	}	801	}
661	}	802	}
662		803
663	void	804	void
664	connection::reset_connection ()	805	connection::reset_connection ()
…		…
673	}	814	}
674		815
675	delete ictx; ictx = 0;	816	delete ictx; ictx = 0;
676	delete octx; octx = 0;	817	delete octx; octx = 0;
677		818
678	si.host= 0;	819	si.host = 0;
679		820
680	last_activity = 0;	821	last_activity = 0;
681	retry_cnt = 0;	822	retry_cnt = 0;
682		823
683	rekey.reset ();	824	rekey.stop ();
684	keepalive.reset ();	825	keepalive.stop ();
685	establish_connection.reset ();	826	establish_connection.stop ();
686	}	827	}
687		828
688	void	829	void
689	connection::shutdown ()	830	connection::shutdown ()
690	{	831	{
…		…
693		834
694	reset_connection ();	835	reset_connection ();
695	}	836	}
696		837
697	void	838	void
698	connection::rekey_cb (tstamp &ts)	839	connection::rekey_cb (time_watcher &w)
699	{	840	{
700	ts = TSTAMP_CANCEL;
701
702	reset_connection ();	841	reset_connection ();
703	establish_connection ();	842	establish_connection ();
704	}	843	}
705		844
706	void	845	void
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	846	connection::send_data_packet (tap_packet *pkt)
708	{	847	{
709	vpndata_packet *p = new vpndata_packet;	848	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	849	int tos = 0;
711		850
712	if (conf->inherit_tos	851	// I am not hilarious about peeking into packets, but so be it.
713	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	852	if (conf->inherit_tos && pkt->is_ipv4 ())
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	853	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		854
717	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	855	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
718	send_vpn_packet (p, si, tos);	856	send_vpn_packet (p, si, tos);
719		857
720	delete p;	858	delete p;
721		859
722	if (oseqno > MAX_SEQNO)	860	if (oseqno > MAX_SEQNO)
723	rekey ();	861	rekey ();
724	}	862	}
725		863
726	void	864	void
727	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	865	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
728	{	866	{
729	if (ictx && octx)	867	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	868	send_data_packet (pkt);
731	else	869	else
732	{	870	{
733	if (!broadcast)//DDDD	871	if (!broadcast)//DDDD
734	queue.put (new tap_packet (*pkt));	872	data_queue.put (new tap_packet (*pkt));
		873
		874	establish_connection ();
		875	}
		876	}
		877
		878	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		879	{
		880	if (ictx && octx)
		881	send_vpn_packet (pkt, si, tos);
		882	else
		883	{
		884	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
735		885
736	establish_connection ();	886	establish_connection ();
737	}	887	}
738	}	888	}
739		889
…		…
745	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	895	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	896	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
747		897
748	switch (pkt->typ ())	898	switch (pkt->typ ())
749	{	899	{
750	case vpn_packet::PT_PING:	900	case vpn_packet::PT_PING:
751	// we send pings instead of auth packets after some retries,	901	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	902	// so reset the retry counter and establish a connection
753	// when we receive a ping.	903	// when we receive a ping.
754	if (!ictx)	904	if (!ictx)
		905	{
		906	if (auth_rate_limiter.can (rsi))
		907	send_auth_request (rsi, true);
		908	}
		909	else
		910	send_ping (rsi, 1); // pong
		911
		912	break;
		913
		914	case vpn_packet::PT_PONG:
		915	break;
		916
		917	case vpn_packet::PT_RESET:
755	{	918	{
756	if (auth_rate_limiter.can (rsi))	919	reset_connection ();
757	send_auth_request (rsi, true);	920
		921	config_packet p = (config_packet ) pkt;
		922
		923	if (!p->chk_config ())
		924	{
		925	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		926	conf->nodename, (const char *)rsi);
		927	connectmode = conf_node::C_DISABLED;
		928	}
		929	else if (connectmode == conf_node::C_ALWAYS)
		930	establish_connection ();
758	}	931	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	932	break;
763		933
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	934	case vpn_packet::PT_AUTH_REQ:
768	{	935	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet p = (config_packet ) pkt;
772
773	if (!p->chk_config ())
774	{	936	{
		937	auth_req_packet p = (auth_req_packet ) pkt;
		938
		939	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		940
		941	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		942	{
		943	if (p->prot_minor != PROTOCOL_MINOR)
		944	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		945	conf->nodename, (const char *)rsi,
		946	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		947
		948	if (p->initiate)
		949	send_auth_request (rsi, false);
		950
		951	rsachallenge k;
		952
		953	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
		954	{
		955	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		956	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		957	break;
		958	}
		959	else
		960	{
		961	delete octx;
		962
		963	octx = new crypto_ctx (k, 1);
		964	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
		965
		966	// compatibility code, remove when no longer required
		967	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
		968
		969	conf->protocols = p->protocols;
		970	features = p->features & config_packet::get_features ();
		971
		972	send_auth_response (rsi, p->id, k);
		973
		974	connection_established ();
		975
		976	break;
		977	}
		978	}
		979	else
775	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	980	slog (L_WARN, _("%s(%s): protocol mismatch"),
776	conf->nodename, (const char *)rsi);	981	conf->nodename, (const char *)rsi);
777	connectmode = conf_node::C_DISABLED;	982
		983	send_reset (rsi);
778	}	984	}
779	else if (connectmode == conf_node::C_ALWAYS)	985
780	establish_connection ();
781	}
782	break;	986	break;
783		987
784	case vpn_packet::PT_AUTH_REQ:	988	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	989	{
787	auth_req_packet p = (auth_req_packet ) pkt;	990	auth_res_packet p = (auth_res_packet ) pkt;
788		991
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	992	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
790		993
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	994	if (p->chk_config ())
792	{	995	{
793	if (p->prot_minor != PROTOCOL_MINOR)	996	if (p->prot_minor != PROTOCOL_MINOR)
794	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	997	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
795	conf->nodename, (const char *)rsi,	998	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	999	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797		1000
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;	1001	rsachallenge chg;
802		1002
803	if (0 > RSA_private_decrypt (sizeof (p->encr),	1003	if (!rsa_cache.find (p->id, chg))
804	(unsigned char )&p->encr, (unsigned char )&k,	1004	{
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1005	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);	1006	conf->nodename, (const char *)rsi);
		1007	break;
		1008	}
808	else	1009	else
809	{	1010	{
810	retry_cnt = 0;	1011	crypto_ctx *cctx = new crypto_ctx (chg, 0);
811	establish_connection.set (NOW + 8); //? ;)	1012
812	keepalive.reset ();	1013	if (!p->hmac_chk (cctx))
		1014	{
		1015	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		1016	"could be an attack, or just corruption or a synchronization error"),
		1017	conf->nodename, (const char *)rsi);
		1018	break;
		1019	}
813	rekey.reset ();	1020	else
		1021	{
		1022	rsaresponse h;
814		1023
		1024	rsa_hash (p->id, chg, h);
		1025
		1026	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
		1027	{
		1028	prot_minor = p->prot_minor;
		1029
		1030	delete ictx; ictx = cctx;
		1031
		1032	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		1033
		1034	si = rsi;
		1035	protocol = rsi.prot;
		1036
		1037	connection_established ();
		1038
		1039	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
		1040	conf->nodename, (const char *)rsi,
		1041	p->prot_major, p->prot_minor);
		1042
		1043	if (::conf.script_node_up)
		1044	run_script (run_script_cb (this, &connection::script_node_up), false);
		1045
		1046	break;
		1047	}
		1048	else
		1049	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
		1050	conf->nodename, (const char *)rsi);
		1051	}
		1052
815	delete ictx;	1053	delete cctx;
816	ictx = 0;
817
818	delete octx;
819
820	octx = new crypto_ctx (k, 1);
821	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
822
823	conf->protocols = p->protocols;
824	send_auth_response (rsi, p->id, k);
825
826	break;
827	}	1054	}
828	}	1055	}
829
830	send_reset (rsi);
831	}	1056	}
832		1057
		1058	send_reset (rsi);
833	break;	1059	break;
834		1060
835	case vpn_packet::PT_AUTH_RES:	1061	case vpn_packet::PT_DATA_COMPRESSED:
836	{	1062	#if !ENABLE_COMPRESSION
837	auth_res_packet p = (auth_res_packet ) pkt;	1063	send_reset (rsi);
		1064	break;
		1065	#endif
838		1066
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1067	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1068
841	if (p->chk_config ())	1069	if (ictx && octx)
842	{	1070	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1071	vpndata_packet p = (vpndata_packet )pkt;
844	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
845	conf->nodename, (const char *)rsi,
846	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
847		1072
848	rsachallenge chg;	1073	if (!p->hmac_chk (ictx))
849		1074	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1075	"could be an attack, or just corruption or a synchronization error"),
851	slog (L_ERR, _("%s(%s): unrequested auth response"),
852	conf->nodename, (const char *)rsi);	1076	conf->nodename, (const char *)rsi);
853	else	1077	else
854	{	1078	{
855	crypto_ctx *cctx = new crypto_ctx (chg, 0);
856
857	if (!p->hmac_chk (cctx))
858	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
859	"could be an attack, or just corruption or an synchronization error"),
860	conf->nodename, (const char *)rsi);
861	else	1079	u32 seqno;
		1080	tap_packet *d = p->unpack (this, seqno);
		1081
		1082	if (iseqno.recv_ok (seqno))
862	{	1083	{
863	rsaresponse h;	1084	vpn->tap->send (d);
864		1085
865	rsa_hash (p->id, chg, h);	1086	if (si != rsi)
866
867	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
868	{	1087	{
869	prot_minor = p->prot_minor;	1088	// fast re-sync on connection changes, useful especially for tcp/ip
870
871	delete ictx; ictx = cctx;
872
873	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875	si = rsi;	1089	si = rsi;
876		1090
877	rekey.set (NOW + ::conf.rekey);	1091	slog (L_INFO, _("%s(%s): socket address changed to %s"),
878	keepalive.set (NOW + ::conf.keepalive);
879
880	// send queued packets
881	while (tap_packet *p = queue.get ())
882	{
883	send_data_packet (p);
884	delete p;
885	}
886
887	connectmode = conf->connectmode;
888
889	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
890	conf->nodename, (const char *)rsi,	1092	conf->nodename, (const char )si, (const char )rsi);
891	strprotocol (protocol),
892	p->prot_major, p->prot_minor);
893
894	if (::conf.script_node_up)
895	run_script (run_script_cb (this, &connection::script_node_up), false);
896
897	break;
898	}	1093	}
899	else
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
901	conf->nodename, (const char *)rsi);
902	}	1094	}
903		1095
904	delete cctx;	1096	delete d;
		1097	break;
905	}	1098	}
906	}	1099	}
907	}
908		1100
909	send_reset (rsi);	1101	send_reset (rsi);
910	break;	1102	break;
911		1103
912	case vpn_packet::PT_DATA_COMPRESSED:
913	#if !ENABLE_COMPRESSION
914	send_reset (rsi);
915	break;
916	#endif
917
918	case vpn_packet::PT_DATA_UNCOMPRESSED:
919
920	if (ictx && octx)
921	{
922	vpndata_packet p = (vpndata_packet )pkt;
923
924	if (rsi == si)
925	{
926	if (!p->hmac_chk (ictx))
927	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
928	"could be an attack, or just corruption or an synchronization error"),
929	conf->nodename, (const char *)rsi);
930	else
931	{
932	u32 seqno;
933	tap_packet *d = p->unpack (this, seqno);
934
935	if (iseqno.recv_ok (seqno))
936	{
937	vpn->tap->send (d);
938
939	if (p->dst () == 0) // re-broadcast
940	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
941	{
942	connection c = i;
943
944	if (c->conf != THISNODE && c->conf != conf)
945	c->inject_data_packet (d);
946	}
947
948	delete d;
949
950	break;
951	}
952	}
953	}
954	else
955	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
956	}
957
958	send_reset (rsi);
959	break;
960
961	case vpn_packet::PT_CONNECT_REQ:	1104	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1105	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1106	{
964	connect_req_packet p = (connect_req_packet ) pkt;	1107	connect_req_packet p = (connect_req_packet ) pkt;
965		1108
966	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1109	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
967	conf->protocols = p->protocols;
968	connection *c = vpn->conns[p->id - 1];	1110	connection *c = vpn->conns[p->id - 1];
		1111	conf->protocols = p->protocols;
969		1112
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1113	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
971	conf->id, p->id, c->ictx && c->octx);	1114	conf->id, p->id, c->ictx && c->octx);
972		1115
973	if (c->ictx && c->octx)	1116	if (c->ictx && c->octx)
974	{	1117	{
975	// send connect_info packets to both sides, in case one is	1118	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1119	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1120	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1121	send_connect_info (c->conf->id, c->si, c->conf->protocols);
979	}	1122	}
		1123	else
		1124	c->establish_connection ();
980	}	1125	}
981		1126
982	break;	1127	break;
983		1128
984	case vpn_packet::PT_CONNECT_INFO:	1129	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1130	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1131	{
987	connect_info_packet p = (connect_info_packet ) pkt;	1132	connect_info_packet p = (connect_info_packet )pkt;
988		1133
989	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1134	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything
990	conf->protocols = p->protocols;	1135	{
991	connection *c = vpn->conns[p->id - 1];	1136	connection *c = vpn->conns[p->id - 1];
992		1137
		1138	c->conf->protocols = p->protocols;
		1139	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1140	p->si.upgrade_protocol (protocol, c->conf);
		1141
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1142	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
994	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1143	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
995		1144
		1145	const sockinfo &dsi = forward_si (p->si);
		1146
		1147	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1148	c->send_auth_request (dsi, true);
		1149	}
997	}	1150	}
998		1151
999	break;	1152	break;
1000		1153
1001	default:	1154	default:
1002	send_reset (rsi);	1155	send_reset (rsi);
1003	break;	1156	break;
1004
1005	}	1157	}
1006	}	1158	}
1007		1159
1008	void connection::keepalive_cb (tstamp &ts)	1160	void connection::keepalive_cb (time_watcher &w)
1009	{	1161	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1162	if (NOW >= last_activity + ::conf.keepalive + 30)
1011	{	1163	{
1012	reset_connection ();	1164	reset_connection ();
1013	establish_connection ();	1165	establish_connection ();
1014	}	1166	}
1015	else if (NOW < last_activity + ::conf.keepalive)	1167	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;	1168	w.start (last_activity + ::conf.keepalive);
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1169	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1170	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1171	{
1020	send_ping (si);	1172	send_ping (si);
1021	ts = NOW + 5;	1173	w.start (NOW + 5);
1022	}	1174	}
		1175	else if (NOW < last_activity + ::conf.keepalive + 10)
		1176	// hold ondemand connections implicitly a few seconds longer
		1177	// should delete octx, though, or something like that ;)
		1178	w.start (last_activity + ::conf.keepalive + 10);
1023	else	1179	else
1024	reset_connection ();	1180	reset_connection ();
1025	}	1181	}
1026		1182
1027	void connection::connect_request (int id)	1183	void connection::send_connect_request (int id)
1028	{	1184	{
1029	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1185	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1030		1186
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1187	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1032	p->hmac_set (octx);	1188	p->hmac_set (octx);
…		…
1035	delete p;	1191	delete p;
1036	}	1192	}
1037		1193
1038	void connection::script_node ()	1194	void connection::script_node ()
1039	{	1195	{
1040	vpn->script_if_up (0);	1196	vpn->script_if_up ();
1041		1197
1042	char *env;	1198	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1199	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1200	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1201	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1202	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1203	}
1048		1204
1049	const char *connection::script_node_up (int)	1205	const char *connection::script_node_up ()
1050	{	1206	{
1051	script_node ();	1207	script_node ();
1052		1208
1053	putenv ("STATE=up");	1209	putenv ("STATE=up");
1054		1210
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1211	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1056	}	1212	}
1057		1213
1058	const char *connection::script_node_down (int)	1214	const char *connection::script_node_down ()
1059	{	1215	{
1060	script_node ();	1216	script_node ();
1061		1217
1062	putenv ("STATE=down");	1218	putenv ("STATE=down");
1063		1219
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1220	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1065	}	1221	}
1066		1222
1067	// send a vpn packet out to other hosts
1068	void
1069	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1070	{
1071	if (protocol & PROT_IPv4)
1072	vpn->send_ipv4_packet (pkt, si, tos);
1073	else
1074	vpn->send_udpv4_packet (pkt, si, tos);
1075	}
1076
1077	connection::connection(struct vpn *vpn_)	1223	connection::connection (struct vpn vpn, conf_node conf)
1078	: vpn(vpn_)	1224	: vpn(vpn), conf(conf)
1079	, rekey (this, &connection::rekey_cb)	1225	, rekey (this, &connection::rekey_cb)
1080	, keepalive (this, &connection::keepalive_cb)	1226	, keepalive (this, &connection::keepalive_cb)
1081	, establish_connection (this, &connection::establish_connection_cb)	1227	, establish_connection (this, &connection::establish_connection_cb)
		1228	#if ENABLE_DNS
		1229	, dns (0)
		1230	#endif
1082	{	1231	{
1083	octx = ictx = 0;	1232	octx = ictx = 0;
1084	retry_cnt = 0;	1233	retry_cnt = 0;
1085		1234
		1235	if (!conf->protocols) // make sure some protocol is enabled
		1236	conf->protocols = PROT_UDPv4;
		1237
1086	connectmode = conf_node::C_ALWAYS; // initial setting	1238	connectmode = conf_node::C_ALWAYS; // initial setting
1087	reset_connection ();	1239	reset_connection ();
1088	}	1240	}
1089		1241
1090	connection::~connection ()	1242	connection::~connection ()

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Comparing gvpe/src/connection.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs. Revision 1.43 by pcg, Fri Mar 4 04:52:38 2005 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.43 by pcg, Fri Mar 4 04:52:38 2005 UTC