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

Comparing gvpe/src/connection.C (file contents):
Revision 1.36 by pcg, Sun May 30 17:36:00 2004 UTC vs.
Revision 1.92 by root, Thu Feb 10 03:59:51 2011 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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 along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
30
31	#include "gettext.h"
32		42
33	#include "conf.h"	43	#include "conf.h"
34	#include "slog.h"	44	#include "slog.h"
35	#include "device.h"	45	#include "device.h"
36	#include "vpn.h"	46	#include "vpn.h"
40		50
41	#if !HAVE_RAND_PSEUDO_BYTES	51	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes	52	# define RAND_pseudo_bytes RAND_bytes
43	#endif	53	#endif
44		54
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	55	#define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol)
		56	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated)
46		57
47	#define ULTRA_FAST 1	58	#define ULTRA_FAST 1
48	#define HLOG 15	59	#define HLOG 15
49	#include "lzf/lzf.h"	60	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	61	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	62	#include "lzf/lzf_d.c"
		63
		64	//////////////////////////////////////////////////////////////////////////////
		65
		66	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		67	static ev::child rs_child_ev;
		68
		69	namespace
		70	{
		71	void // c++ requires external linkage here, apparently :(
		72	rs_child_cb (ev::child &w, int revents)
		73	{
		74	w.stop ();
		75
		76	if (rs_queue.empty ())
		77	return;
		78
		79	pid_t pid = run_script (*rs_queue.front ().first, false);
		80	if (pid)
		81	{
		82	w.set (pid);
		83	w.start ();
		84	}
		85	else
		86	slog (L_WARN, rs_queue.front ().second);
		87
		88	delete rs_queue.front ().first;
		89	rs_queue.pop ();
		90	}
		91	};
		92
		93	// despite the fancy name, this is quite a hack
		94	static void
		95	run_script_queued (run_script_cb cb, const char warnmsg)
		96	{
		97	rs_queue.push (std::make_pair (cb, warnmsg));
		98
		99	if (!rs_child_ev.is_active ())
		100	{
		101	rs_child_ev.set<rs_child_cb> ();
		102	rs_child_ev ();
		103	}
		104	}
		105
		106	//////////////////////////////////////////////////////////////////////////////
52		107
53	struct crypto_ctx	108	struct crypto_ctx
54	{	109	{
55	EVP_CIPHER_CTX cctx;	110	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	111	HMAC_CTX hctx;
…		…
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));	139	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	140	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);	141	EVP_MD_CTX_cleanup (&ctx);
87	}	142	}
88		143
89	struct rsa_entry {	144	struct rsa_entry
		145	{
90	tstamp expire;	146	tstamp expire;
91	rsaid id;	147	rsaid id;
92	rsachallenge chg;	148	rsachallenge chg;
93	};	149	};
94		150
95	struct rsa_cache : list<rsa_entry>	151	struct rsa_cache : list<rsa_entry>
96	{	152	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	153	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
98		154
99	bool find (const rsaid &id, rsachallenge &chg)	155	bool find (const rsaid &id, rsachallenge &chg)
100	{	156	{
101	for (iterator i = begin (); i != end (); ++i)	157	for (iterator i = begin (); i != end (); ++i)
102	{	158	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	159	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
104	{	160	{
105	memcpy (&chg, &i->chg, sizeof chg);	161	memcpy (&chg, &i->chg, sizeof chg);
106		162
107	erase (i);	163	erase (i);
108	return true;	164	return true;
109	}	165	}
110	}	166	}
111		167
112	if (cleaner.at < NOW)	168	if (!cleaner.is_active ())
113	cleaner.start (NOW + RSA_TTL);	169	cleaner.again ();
114		170
115	return false;	171	return false;
116	}	172	}
117		173
118	void gen (rsaid &id, rsachallenge &chg)	174	void gen (rsaid &id, rsachallenge &chg)
119	{	175	{
120	rsa_entry e;	176	rsa_entry e;
121		177
122	RAND_bytes ((unsigned char *)&id, sizeof id);	178	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);	179	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124		180
125	e.expire = NOW + RSA_TTL;	181	e.expire = ev_now () + RSA_TTL;
126	e.id = id;	182	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);	183	memcpy (&e.chg, &chg, sizeof chg);
128		184
129	push_back (e);	185	push_back (e);
130		186
131	if (cleaner.at < NOW)	187	if (!cleaner.is_active ())
132	cleaner.start (NOW + RSA_TTL);	188	cleaner.again ();
133	}	189	}
134		190
135	rsa_cache ()	191	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)	192	{
137	{ }	193	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		194	cleaner.set (RSA_TTL, RSA_TTL);
		195	}
138		196
139	} rsa_cache;	197	} rsa_cache;
140		198
141	void rsa_cache::cleaner_cb (time_watcher &w)	199	void
		200	rsa_cache::cleaner_cb (ev::timer &w, int revents)
142	{	201	{
143	if (!empty ())	202	if (empty ())
		203	w.stop ();
		204	else
144	{	205	{
145	w.start (NOW + RSA_TTL);
146
147	for (iterator i = begin (); i != end (); )	206	for (iterator i = begin (); i != end (); )
148	if (i->expire <= NOW)	207	if (i->expire <= ev_now ())
149	i = erase (i);	208	i = erase (i);
150	else	209	else
151	++i;	210	++i;
152	}	211	}
153	}	212	}
154		213
155	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
156		215
157	void pkt_queue::put (net_packet *p)	216	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		217	: max_ttl (max_ttl), max_queue (max_queue)
158	{	218	{
159	if (queue[i])	219	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		220
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	221	i = 0;
187	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	225	}
189		226
190	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
191	{	228	{
192	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
193	delete queue[i];	232	delete [] queue;
194	}	233	}
195		234
		235	void
		236	pkt_queue::expire_cb (ev::timer &w, int revents)
		237	{
		238	ev_tstamp expire = ev_now () - max_ttl;
		239
		240	for (;;)
		241	{
		242	if (empty ())
		243	break;
		244
		245	double diff = queue[j].tstamp - expire;
		246
		247	if (diff >= 0.)
		248	{
		249	w.start (diff > 0.5 ? diff : 0.5);
		250	break;
		251	}
		252
		253	delete get ();
		254	}
		255	}
		256
		257	void
		258	pkt_queue::put (net_packet *p)
		259	{
		260	ev_tstamp now = ev_now ();
		261
		262	// start expiry timer
		263	if (empty ())
		264	expire.start (max_ttl);
		265
		266	int ni = i + 1 == max_queue ? 0 : i + 1;
		267
		268	if (ni == j)
		269	delete get ();
		270
		271	queue[i].pkt = p;
		272	queue[i].tstamp = now;
		273
		274	i = ni;
		275	}
		276
		277	net_packet *
		278	pkt_queue::get ()
		279	{
		280	if (empty ())
		281	return 0;
		282
		283	net_packet *p = queue[j].pkt;
		284	queue[j].pkt = 0;
		285
		286	j = j + 1 == max_queue ? 0 : j + 1;
		287
		288	return p;
		289	}
		290
196	struct net_rateinfo {	291	struct net_rateinfo
		292	{
197	u32 host;	293	u32 host;
198	double pcnt, diff;	294	double pcnt, diff;
199	tstamp last;	295	tstamp last;
200	};	296	};
201		297
…		…
211		307
212	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	309	bool can (u32 host);
214	};	310	};
215		311
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		313
		314	bool
218	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
219	{	316	{
220	iterator i;	317	iterator i;
221		318
222	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
223	if (i->host == host)	320	if (i->host == host)
224	break;	321	break;
225	else if (i->last < NOW - NRL_EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	323	i = erase (i);
227	else	324	else
228	i++;	325	i++;
229		326
230	if (i == end ())	327	if (i == end ())
…		…
232	net_rateinfo ri;	329	net_rateinfo ri;
233		330
234	ri.host = host;	331	ri.host = host;
235	ri.pcnt = 1.;	332	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	333	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	334	ri.last = ev_now ();
238		335
239	push_front (ri);	336	push_front (ri);
240		337
241	return true;	338	return true;
242	}	339	}
…		…
244	{	341	{
245	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
246	erase (i);	343	erase (i);
247		344
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		347
251	ri.last = NOW;	348	ri.last = ev_now ();
252		349
253	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
254		351
255	bool send = dif > NRL_CUTOFF;	352	bool send = dif > NRL_CUTOFF;
256		353
…		…
270		367
271	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
272		369
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
274		371
		372	void
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
276	{	374	{
277	unsigned int xlen;	375	unsigned int xlen;
278		376
279	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
280		378
…		…
298	hmac_gen (ctx);	396	hmac_gen (ctx);
299		397
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	399	}
302		400
		401	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	403	{
305	type = type_;	404	type = type_;
306		405
307	int src = THISNODE->id;	406	int src = THISNODE->id;
308		407
…		…
313		412
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		415
317	struct vpndata_packet : vpn_packet	416	struct vpndata_packet : vpn_packet
		417	{
		418	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		419
		420	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		421	tap_packet unpack (connection conn, u32 &seqno);
		422
		423	private:
		424	const u32 data_hdr_size () const
318	{	425	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
322	tap_packet unpack (connection conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	427	}
		428	};
330		429
331	void	430	void
332	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	431	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
333	{	432	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
337		436
338	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
340		439
341	if (conn->features & ENABLE_COMPRESSION)	440	if (conn->features & FEATURE_COMPRESSION)
342	{	441	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		443
345	if (cl)	444	if (cl)
346	{	445	{
…		…
466	f \|= FEATURE_COMPRESSION;	565	f \|= FEATURE_COMPRESSION;
467	#endif	566	#endif
468	#if ENABLE_ROHC	567	#if ENABLE_ROHC
469	f \|= FEATURE_ROHC;	568	f \|= FEATURE_ROHC;
470	#endif	569	#endif
		570	#if ENABLE_BRIDGING
		571	f \|= FEATURE_BRIDGING;
		572	#endif
471	return f;	573	return f;
472	}	574	}
473	};	575	};
474		576
		577	void
475	void config_packet::setup (ptype type, int dst)	578	config_packet::setup (ptype type, int dst)
476	{	579	{
477	prot_major = PROTOCOL_MAJOR;	580	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	581	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	582	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	583	hmaclen = HMACLENGTH;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;	584	flags = 0;
482	challengelen = sizeof (rsachallenge);	585	challengelen = sizeof (rsachallenge);
483	features = get_features ();	586	features = get_features ();
484		587
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	588	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));	589	digest_nid = htonl (EVP_MD_type (RSA_HASH));
…		…
488		591
489	len = sizeof (*this) - sizeof (net_packet);	592	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	593	set_hdr (type, dst);
491	}	594	}
492		595
		596	bool
493	bool config_packet::chk_config () const	597	config_packet::chk_config () const
494	{	598	{
495	if (prot_major != PROTOCOL_MAJOR)	599	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	600	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	601	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	602	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499	else if (hmaclen != HMACLENGTH)	603	else if (hmaclen != HMACLENGTH)
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);	604	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))	605	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));	606	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
508	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
…		…
526	rsaencrdata encr;	626	rsaencrdata encr;
527		627
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	628	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	629	{
530	config_packet::setup (PT_AUTH_REQ, dst);	630	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	631	strncpy (magic, MAGIC_OLD, 8);
532	initiate = !!initiate_;	632	initiate = !!initiate_;
533	protocols = protocols_;	633	protocols = protocols_;
534		634
535	len = sizeof (*this) - sizeof (net_packet);	635	len = sizeof (*this) - sizeof (net_packet);
536	}	636	}
…		…
585	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
586		686
587	void	687	void
588	connection::connection_established ()	688	connection::connection_established ()
589	{	689	{
		690	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		691
590	if (ictx && octx)	692	if (ictx && octx)
591	{	693	{
592	connectmode = conf->connectmode;
593
594	// make sure rekeying timeouts are slightly asymmetric	694	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey	695	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
596	+ (conf->id > THISNODE->id ? 10 : 0));	696	rekey.start (rekey_interval, rekey_interval);
597	keepalive.start (NOW + ::conf.keepalive);	697	keepalive.start (::conf.keepalive);
598		698
599	// send queued packets	699	// send queued packets
600	if (ictx && octx)	700	if (ictx && octx)
601	{	701	{
602	while (tap_packet p = (tap_packet )data_queue.get ())	702	while (tap_packet p = (tap_packet )data_queue.get ())
603	{	703	{
604	send_data_packet (p);	704	if (p->len) send_data_packet (p);
605	delete p;	705	delete p;
606	}	706	}
607		707
608	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	708	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
609	{	709	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);	710	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;	711	delete p;
612	}	712	}
613	}	713	}
		714
		715	vpn->connection_established (this);
614	}	716	}
615	else	717	else
616	{	718	{
617	retry_cnt = 0;	719	retry_cnt = 0;
618	establish_connection.start (NOW + 5);	720	establish_connection.start (5);
619	keepalive.stop ();	721	keepalive.stop ();
620	rekey.stop ();	722	rekey.stop ();
621	}	723	}
622	}	724	}
623		725
624	void	726	void
625	connection::reset_si ()	727	connection::reset_si ()
626	{	728	{
		729	if (vpn->can_direct (THISNODE, conf))
627	protocol = best_protocol (THISNODE->protocols & conf->protocols);	730	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
628		731	else
629	// mask out protocols we cannot establish	732	{
630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	733	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	734	protocol = 0;
		735	}
632		736
633	si.set (conf, protocol);	737	si.set (conf, protocol);
		738
		739	is_direct = si.valid ();
634	}	740	}
635		741
636	// ensure sockinfo is valid, forward if necessary	742	// ensure sockinfo is valid, forward if necessary
637	const sockinfo &	743	const sockinfo &
638	connection::forward_si (const sockinfo &si) const	744	connection::forward_si (const sockinfo &si) const
639	{	745	{
640	if (!si.valid ())	746	if (!si.valid ())
641	{	747	{
642	connection *r = vpn->find_router ();	748	connection *r = vpn->find_router_for (this);
643		749
644	if (r)	750	if (r)
645	{	751	{
646	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	752	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
647	conf->nodename, r->conf->nodename);	753	conf->nodename, r->conf->nodename);
648	return r->si;	754	return r->si;
649	}	755	}
650	else	756	else
651	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	757	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
652	conf->nodename);	758	conf->nodename);
653	}	759	}
654		760
655	return si;	761	return si;
656	}	762	}
…		…
666	connection::send_ping (const sockinfo &si, u8 pong)	772	connection::send_ping (const sockinfo &si, u8 pong)
667	{	773	{
668	ping_packet *pkt = new ping_packet;	774	ping_packet *pkt = new ping_packet;
669		775
670	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	776	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		777
		778	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		779
671	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	780	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
672		781
673	delete pkt;	782	delete pkt;
674	}	783	}
675		784
…		…
694		803
695	rsachallenge chg;	804	rsachallenge chg;
696	rsa_cache.gen (pkt->id, chg);	805	rsa_cache.gen (pkt->id, chg);
697	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	806	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
698		807
699	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	808	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
700		809
701	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	810	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
702		811
703	delete pkt;	812	delete pkt;
704	}	813	}
…		…
712		821
713	rsa_hash (id, chg, pkt->response);	822	rsa_hash (id, chg, pkt->response);
714		823
715	pkt->hmac_set (octx);	824	pkt->hmac_set (octx);
716		825
717	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
718		827
719	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	828	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
720		829
721	delete pkt;	830	delete pkt;
722	}	831	}
723		832
724	void	833	void
725	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	834	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
726	{	835	{
727	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	836	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
728	conf->id, rid, (const char *)rsi);	837	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
729		838
730	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	839	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
731		840
732	r->hmac_set (octx);	841	r->hmac_set (octx);
733	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
734		843
735	delete r;	844	delete r;
736	}	845	}
737		846
738	void	847	inline void
739	connection::establish_connection_cb (time_watcher &w)	848	connection::establish_connection_cb (ev::timer &w, int revents)
740	{	849	{
741	if (!ictx	850	if (!(ictx && octx)
742	&& conf != THISNODE	851	&& conf != THISNODE
743	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
744	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
745	&& NOW > w.at)	854	&& !w.is_active ())
746	{	855	{
747	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
748		857	// and stop trying. should probably be handled by a per-connection expire handler.
749	if (retry_int < 3600 * 8)	858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ();
750	retry_cnt++;	861	return;
		862	}
751		863
752	w.start (NOW + retry_int);	864	last_establish_attempt = ev_now ();
		865
		866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		867	? (retry_cnt & 3) + 1
		868	: 1 << (retry_cnt >> 2));
753		869
754	reset_si ();	870	reset_si ();
755		871
756	if (si.prot && !si.host)	872	bool slow = si.prot & PROT_SLOW;
		873
		874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		875	{
		876	/TODO/ /* start the timer so we don't recurse endlessly */
		877	w.start (1);
757	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
		879	}
758	else	880	else
759	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
760	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
		887
		888	slow = slow \|\| (dsi.prot & PROT_SLOW);
761		889
762	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
763	{	891	{
764	if (retry_cnt < 4)	892	if (retry_cnt < 4)
765	send_auth_request (dsi, true);	893	send_auth_request (dsi, true);
766	else	894	else
767	send_ping (dsi, 0);	895	send_ping (dsi, 0);
768	}	896	}
769	}	897	}
		898
		899	retry_int *= slow ? 8. : 0.9;
		900
		901	if (retry_int < conf->max_retry)
		902	retry_cnt++;
		903	else
		904	retry_int = conf->max_retry;
		905
		906	w.start (retry_int);
770	}	907	}
771	}	908	}
772		909
773	void	910	void
774	connection::reset_connection ()	911	connection::reset_connection ()
…		…
777	{	914	{
778	slog (L_INFO, _("%s(%s): connection lost"),	915	slog (L_INFO, _("%s(%s): connection lost"),
779	conf->nodename, (const char *)si);	916	conf->nodename, (const char *)si);
780		917
781	if (::conf.script_node_down)	918	if (::conf.script_node_down)
782	run_script (run_script_cb (this, &connection::script_node_down), false);	919	{
		920	run_script_cb *cb = new run_script_cb;
		921	cb->set<connection, &connection::script_node_down> (this);
		922	run_script_queued (cb, _("node-down command execution failed, continuing."));
		923	}
783	}	924	}
784		925
785	delete ictx; ictx = 0;	926	delete ictx; ictx = 0;
786	delete octx; octx = 0;	927	delete octx; octx = 0;
		928	#if ENABLE_DNS
		929	dnsv4_reset_connection ();
		930	#endif
787		931
788	si.host= 0;	932	si.host = 0;
789		933
790	last_activity = 0;	934	last_activity = 0.;
		935	//last_si_change = 0.;
791	retry_cnt = 0;	936	retry_cnt = 0;
792		937
793	rekey.stop ();	938	rekey.stop ();
794	keepalive.stop ();	939	keepalive.stop ();
795	establish_connection.stop ();	940	establish_connection.stop ();
…		…
802	send_reset (si);	947	send_reset (si);
803		948
804	reset_connection ();	949	reset_connection ();
805	}	950	}
806		951
807	void	952	// poor-man's rekeying
808	connection::rekey_cb (time_watcher &w)	953	inline void
		954	connection::rekey_cb (ev::timer &w, int revents)
809	{	955	{
810	reset_connection ();	956	reset_connection ();
811	establish_connection ();	957	establish_connection ();
812	}	958	}
813		959
…		…
829	if (oseqno > MAX_SEQNO)	975	if (oseqno > MAX_SEQNO)
830	rekey ();	976	rekey ();
831	}	977	}
832		978
833	void	979	void
		980	connection::post_inject_queue ()
		981	{
		982	// force a connection every now and when when packets are sent (max 1/s)
		983	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		984	establish_connection.stop ();
		985
		986	establish_connection ();
		987	}
		988
		989	void
834	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	990	connection::inject_data_packet (tap_packet *pkt)
835	{	991	{
836	if (ictx && octx)	992	if (ictx && octx)
837	send_data_packet (pkt);	993	send_data_packet (pkt);
838	else	994	else
839	{	995	{
840	if (!broadcast)//DDDD
841	data_queue.put (new tap_packet (*pkt));	996	data_queue.put (new tap_packet (*pkt));
842		997	post_inject_queue ();
843	establish_connection ();
844	}	998	}
845	}	999	}
846		1000
		1001	void
847	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1002	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
848	{	1003	{
849	if (ictx && octx)	1004	if (ictx && octx)
850	send_vpn_packet (pkt, si, tos);	1005	send_vpn_packet (pkt, si, tos);
851	else	1006	else
852	{	1007	{
853	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1008	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
854		1009	post_inject_queue ();
855	establish_connection ();
856	}	1010	}
857	}	1011	}
858		1012
859	void	1013	void
860	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1014	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
861	{	1015	{
862	last_activity = NOW;	1016	last_activity = ev_now ();
863		1017
864	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1018	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
865	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1019	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1020
		1021	if (connectmode == conf_node::C_DISABLED)
		1022	return;
866		1023
867	switch (pkt->typ ())	1024	switch (pkt->typ ())
868	{	1025	{
869	case vpn_packet::PT_PING:	1026	case vpn_packet::PT_PING:
		1027	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1028
870	// we send pings instead of auth packets after some retries,	1029	// we send pings instead of auth packets after some retries,
871	// so reset the retry counter and establish a connection	1030	// so reset the retry counter and establish a connection
872	// when we receive a ping.	1031	// when we receive a ping.
873	if (!ictx)	1032	if (!ictx)
874	{	1033	{
875	if (auth_rate_limiter.can (rsi))	1034	if (auth_rate_limiter.can (rsi))
876	send_auth_request (rsi, true);	1035	send_auth_request (rsi, true);
877	}	1036	}
878	else	1037	else
		1038	// we would love to change the socket address here, but ping's aren't
		1039	// authenticated, so we best ignore it.
879	send_ping (rsi, 1); // pong	1040	send_ping (rsi, 1); // pong
880		1041
881	break;	1042	break;
882		1043
883	case vpn_packet::PT_PONG:	1044	case vpn_packet::PT_PONG:
		1045	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1046
		1047	// a PONG might mean that the other side doesn't really know
		1048	// about our desire for communication.
		1049	establish_connection ();
884	break;	1050	break;
885		1051
886	case vpn_packet::PT_RESET:	1052	case vpn_packet::PT_RESET:
887	{	1053	{
888	reset_connection ();	1054	reset_connection ();
889		1055
890	config_packet p = (config_packet ) pkt;	1056	config_packet p = (config_packet ) pkt;
891		1057
892	if (!p->chk_config ())	1058	if (!p->chk_config ())
893	{	1059	{
894	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1060	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
895	conf->nodename, (const char *)rsi);	1061	conf->nodename, (const char *)rsi);
896	connectmode = conf_node::C_DISABLED;	1062	connectmode = conf_node::C_DISABLED;
897	}	1063	}
898	else if (connectmode == conf_node::C_ALWAYS)	1064	else if (connectmode == conf_node::C_ALWAYS)
899	establish_connection ();	1065	establish_connection ();
…		…
903	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
904	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
905	{	1071	{
906	auth_req_packet p = (auth_req_packet ) pkt;	1072	auth_req_packet p = (auth_req_packet ) pkt;
907		1073
908	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1074	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
909		1075
910	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1076	if (p->chk_config ()
		1077	&& (!strncmp (p->magic, MAGIC_OLD, 8) \|\| !strncmp (p->magic, MAGIC, 8)))
911	{	1078	{
912	if (p->prot_minor != PROTOCOL_MINOR)	1079	if (p->prot_minor != PROTOCOL_MINOR)
913	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1080	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
914	conf->nodename, (const char *)rsi,	1081	conf->nodename, (const char *)rsi,
915	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1082	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
930	delete octx;	1097	delete octx;
931		1098
932	octx = new crypto_ctx (k, 1);	1099	octx = new crypto_ctx (k, 1);
933	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1100	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
934		1101
935	// compatibility code, remove when no longer required
936	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
937
938	conf->protocols = p->protocols;	1102	conf->protocols = p->protocols;
939	features = p->features & config_packet::get_features ();	1103	features = p->features & config_packet::get_features ();
940		1104
941	send_auth_response (rsi, p->id, k);	1105	send_auth_response (rsi, p->id, k);
942		1106
…		…
944		1108
945	break;	1109	break;
946	}	1110	}
947	}	1111	}
948	else	1112	else
949	slog (L_WARN, _("%s(%s): protocol mismatch"),	1113	slog (L_WARN, _("%s(%s): protocol mismatch."),
950	conf->nodename, (const char *)rsi);	1114	conf->nodename, (const char *)rsi);
951		1115
952	send_reset (rsi);	1116	send_reset (rsi);
953	}	1117	}
954		1118
955	break;	1119	break;
956		1120
957	case vpn_packet::PT_AUTH_RES:	1121	case vpn_packet::PT_AUTH_RES:
958	{	1122	{
959	auth_res_packet p = (auth_res_packet ) pkt;	1123	auth_res_packet p = (auth_res_packet )pkt;
960		1124
961	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1125	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
962		1126
963	if (p->chk_config ())	1127	if (p->chk_config ())
964	{	1128	{
965	if (p->prot_minor != PROTOCOL_MINOR)	1129	if (p->prot_minor != PROTOCOL_MINOR)
966	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1130	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
969		1133
970	rsachallenge chg;	1134	rsachallenge chg;
971		1135
972	if (!rsa_cache.find (p->id, chg))	1136	if (!rsa_cache.find (p->id, chg))
973	{	1137	{
974	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1138	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
975	conf->nodename, (const char *)rsi);	1139	conf->nodename, (const char *)rsi);
976	break;	1140	break;
977	}	1141	}
978	else	1142	else
979	{	1143	{
980	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1144	crypto_ctx *cctx = new crypto_ctx (chg, 0);
981		1145
982	if (!p->hmac_chk (cctx))	1146	if (!p->hmac_chk (cctx))
983	{	1147	{
984	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1148	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
985	"could be an attack, or just corruption or a synchronization error"),	1149	"could be an attack, or just corruption or a synchronization error."),
986	conf->nodename, (const char *)rsi);	1150	conf->nodename, (const char *)rsi);
987	break;	1151	break;
988	}	1152	}
989	else	1153	else
990	{	1154	{
…		…
1001	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1165	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1002		1166
1003	si = rsi;	1167	si = rsi;
1004	protocol = rsi.prot;	1168	protocol = rsi.prot;
1005		1169
		1170	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1171	conf->nodename, (const char *)rsi,
		1172	is_direct ? "direct" : "forwarded",
		1173	p->prot_major, p->prot_minor);
		1174
1006	connection_established ();	1175	connection_established ();
1007		1176
1008	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1009	conf->nodename, (const char *)rsi,
1010	p->prot_major, p->prot_minor);
1011
1012	if (::conf.script_node_up)	1177	if (::conf.script_node_up)
1013	run_script (run_script_cb (this, &connection::script_node_up), false);	1178	{
		1179	run_script_cb *cb = new run_script_cb;
		1180	cb->set<connection, &connection::script_node_up> (this);
		1181	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1182	}
1014		1183
1015	break;	1184	break;
1016	}	1185	}
1017	else	1186	else
1018	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1187	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1019	conf->nodename, (const char *)rsi);	1188	conf->nodename, (const char *)rsi);
1020	}	1189	}
1021		1190
1022	delete cctx;	1191	delete cctx;
1023	}	1192	}
…		…
1039	{	1208	{
1040	vpndata_packet p = (vpndata_packet )pkt;	1209	vpndata_packet p = (vpndata_packet )pkt;
1041		1210
1042	if (!p->hmac_chk (ictx))	1211	if (!p->hmac_chk (ictx))
1043	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1212	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1044	"could be an attack, or just corruption or a synchronization error"),	1213	"could be an attack, or just corruption or a synchronization error."),
1045	conf->nodename, (const char *)rsi);	1214	conf->nodename, (const char *)rsi);
1046	else	1215	else
1047	{	1216	{
1048	u32 seqno;	1217	u32 seqno;
1049	tap_packet *d = p->unpack (this, seqno);	1218	tap_packet *d = p->unpack (this, seqno);
		1219	int seqclass = iseqno.seqno_classify (seqno);
1050		1220
1051	if (iseqno.recv_ok (seqno))	1221	if (seqclass == 0) // ok
1052	{	1222	{
1053	vpn->tap->send (d);	1223	vpn->tap->send (d);
1054		1224
1055	if (si != rsi)	1225	if (si != rsi)
1056	{	1226	{
1057	// fast re-sync on connection changes, useful especially for tcp/ip	1227	// fast re-sync on source address changes, useful especially for tcp/ip
		1228	//if (last_si_change < ev_now () + 5.)
1058	si = rsi;	1229	// {
1059
1060	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1230	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1061	conf->nodename, (const char )si, (const char )rsi);	1231	conf->nodename, (const char )si, (const char )rsi);
		1232
		1233	si = rsi;
		1234
		1235	if (::conf.script_node_change)
		1236	{
		1237	run_script_cb *cb = new run_script_cb;
		1238	cb->set<connection, &connection::script_node_change> (this);
		1239	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1240	}
		1241
		1242	// }
		1243	//else
		1244	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1245	// conf->nodename, (const char )si, (const char )rsi);
1062	}	1246	}
		1247	}
		1248	else if (seqclass == 1) // far history
		1249	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1250	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1251	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1252	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1253	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1254	else if (seqclass == 3) // reset
		1255	{
		1256	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1257	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1258	send_reset (rsi);
1063	}	1259	}
1064		1260
1065	delete d;	1261	delete d;
1066	break;	1262	break;
1067	}	1263	}
…		…
1071	break;	1267	break;
1072		1268
1073	case vpn_packet::PT_CONNECT_REQ:	1269	case vpn_packet::PT_CONNECT_REQ:
1074	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1270	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1075	{	1271	{
1076	connect_req_packet p = (connect_req_packet ) pkt;	1272	connect_req_packet p = (connect_req_packet )pkt;
1077		1273
1078	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1274	if (p->id > 0 && p->id <= vpn->conns.size ())
1079	connection *c = vpn->conns[p->id - 1];
1080	conf->protocols = p->protocols;
1081
1082	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1083	conf->id, p->id, c->ictx && c->octx);
1084
1085	if (c->ictx && c->octx)
1086	{	1275	{
		1276	connection *c = vpn->conns[p->id - 1];
		1277	conf->protocols = p->protocols;
		1278
		1279	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
		1280	conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
		1281
		1282	if (c->ictx && c->octx)
		1283	{
1087	// send connect_info packets to both sides, in case one is	1284	// send connect_info packets to both sides, in case one is
1088	// behind a nat firewall (or both ;)	1285	// behind a nat firewall (or both ;)
1089	c->send_connect_info (conf->id, si, conf->protocols);	1286	c->send_connect_info (conf->id, si, conf->protocols);
1090	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1287	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1288	}
		1289	else
		1290	c->establish_connection ();
1091	}	1291	}
1092	else	1292	else
1093	c->establish_connection ();	1293	slog (L_WARN,
		1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1295	p->id);
1094	}	1296	}
1095		1297
1096	break;	1298	break;
1097		1299
1098	case vpn_packet::PT_CONNECT_INFO:	1300	case vpn_packet::PT_CONNECT_INFO:
1099	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1301	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1100	{	1302	{
1101	connect_info_packet p = (connect_info_packet ) pkt;	1303	connect_info_packet p = (connect_info_packet )pkt;
1102		1304
1103	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1305	if (p->id > 0 && p->id <= vpn->conns.size ())
1104		1306	{
1105	connection *c = vpn->conns[p->id - 1];	1307	connection *c = vpn->conns[p->id - 1];
1106		1308
1107	c->conf->protocols = p->protocols;	1309	c->conf->protocols = p->protocols;
1108	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1310	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1109	p->si.upgrade_protocol (protocol, c->conf);	1311	p->si.upgrade_protocol (protocol, c->conf);
1110		1312
1111	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1313	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
		1314	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1112	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1315	(const char *)p->si, !c->ictx && !c->octx);
1113		1316
1114	const sockinfo &dsi = forward_si (p->si);	1317	const sockinfo &dsi = forward_si (p->si);
1115		1318
1116	if (dsi.valid ())	1319	if (dsi.valid ())
1117	c->send_auth_request (dsi, true);	1320	c->send_auth_request (dsi, true);
		1321	}
		1322	else
		1323	slog (L_WARN,
		1324	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1325	p->id);
1118	}	1326	}
1119		1327
1120	break;	1328	break;
1121		1329
1122	default:	1330	default:
1123	send_reset (rsi);	1331	send_reset (rsi);
1124	break;	1332	break;
1125	}	1333	}
1126	}	1334	}
1127		1335
1128	void connection::keepalive_cb (time_watcher &w)	1336	inline void
		1337	connection::keepalive_cb (ev::timer &w, int revents)
1129	{	1338	{
1130	if (NOW >= last_activity + ::conf.keepalive + 30)	1339	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1131	{	1340	{
1132	reset_connection ();	1341	reset_connection ();
1133	establish_connection ();	1342	establish_connection ();
1134	}	1343	}
1135	else if (NOW < last_activity + ::conf.keepalive)	1344	else if (ev_now () < last_activity + ::conf.keepalive)
1136	w.start (last_activity + ::conf.keepalive);	1345	w.start (last_activity + ::conf.keepalive - ev::now ());
1137	else if (conf->connectmode != conf_node::C_ONDEMAND	1346	else if (conf->connectmode != conf_node::C_ONDEMAND
1138	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1347	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1139	{	1348	{
1140	send_ping (si);	1349	send_ping (si);
1141	w.start (NOW + 5);	1350	w.start (3);
1142	}	1351	}
1143	else if (NOW < last_activity + ::conf.keepalive + 10)	1352	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1144	// hold ondemand connections implicitly a few seconds longer	1353	// hold ondemand connections implicitly a few seconds longer
1145	// should delete octx, though, or something like that ;)	1354	// should delete octx, though, or something like that ;)
1146	w.start (last_activity + ::conf.keepalive + 10);	1355	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1147	else	1356	else
1148	reset_connection ();	1357	reset_connection ();
1149	}	1358	}
1150		1359
		1360	void
1151	void connection::send_connect_request (int id)	1361	connection::send_connect_request (int id)
1152	{	1362	{
1153	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1363	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1154		1364
1155	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1365	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
		1366	conf->nodename, vpn->conns[id - 1]->conf->nodename);
1156	p->hmac_set (octx);	1367	p->hmac_set (octx);
1157	send_vpn_packet (p, si);	1368	send_vpn_packet (p, si);
1158		1369
1159	delete p;	1370	delete p;
1160	}	1371	}
1161		1372
1162	void connection::script_node ()	1373	void
		1374	connection::script_init_env (const char *ext)
1163	{	1375	{
1164	vpn->script_if_up ();
1165
1166	char *env;	1376	char *env;
		1377	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1378	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1379	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1380	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1381	conf->id & 0xff); putenv (env);
		1382	}
		1383
		1384	void
		1385	connection::script_init_connect_env ()
		1386	{
		1387	vpn->script_init_env ();
		1388
		1389	char *env;
1167	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1390	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1391	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1168	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1392	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1169	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1393	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1170	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1394	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1171	}	1395	}
1172		1396
		1397	inline const char *
1173	const char *connection::script_node_up ()	1398	connection::script_node_up ()
1174	{	1399	{
1175	script_node ();	1400	script_init_connect_env ();
1176		1401
1177	putenv ("STATE=up");	1402	putenv ((char *)"STATE=up");
1178		1403
		1404	char *filename;
		1405	asprintf (&filename,
		1406	"%s/%s",
		1407	confbase,
1179	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1408	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1180	}
1181		1409
		1410	return filename;
		1411	}
		1412
		1413	inline const char *
		1414	connection::script_node_change ()
		1415	{
		1416	script_init_connect_env ();
		1417
		1418	putenv ((char *)"STATE=change");
		1419
		1420	char *filename;
		1421	asprintf (&filename,
		1422	"%s/%s",
		1423	confbase,
		1424	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1425
		1426	return filename;
		1427	}
		1428
		1429	inline const char *
1182	const char *connection::script_node_down ()	1430	connection::script_node_down ()
1183	{	1431	{
1184	script_node ();	1432	script_init_connect_env ();
1185		1433
1186	putenv ("STATE=down");	1434	putenv ((char *)"STATE=down");
1187		1435
1188	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1436	char *filename;
1189	}	1437	asprintf (&filename,
		1438	"%s/%s",
		1439	confbase,
		1440	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1190		1441
		1442	return filename;
		1443	}
		1444
1191	connection::connection(struct vpn *vpn_)	1445	connection::connection (struct vpn vpn, conf_node conf)
1192	: vpn(vpn_)	1446	: vpn(vpn), conf(conf),
1193	, rekey (this, &connection::rekey_cb)	1447	#if ENABLE_DNS
1194	, keepalive (this, &connection::keepalive_cb)	1448	dns (0),
		1449	#endif
		1450	data_queue(conf->max_ttl, conf->max_queue + 1),
		1451	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1452	{
		1453	rekey .set<connection, &connection::rekey_cb > (this);
		1454	keepalive .set<connection, &connection::keepalive_cb > (this);
1195	, establish_connection (this, &connection::establish_connection_cb)	1455	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1196	{	1456
		1457	last_establish_attempt = 0.;
1197	octx = ictx = 0;	1458	octx = ictx = 0;
1198	retry_cnt = 0;
1199		1459
1200	connectmode = conf_node::C_ALWAYS; // initial setting	1460	if (!conf->protocols) // make sure some protocol is enabled
		1461	conf->protocols = PROT_UDPv4;
		1462
		1463	connectmode = conf->connectmode;
		1464
		1465	// queue a dummy packet to force an initial connection attempt
		1466	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1467	vpn_queue.put (new net_packet);
		1468
1201	reset_connection ();	1469	reset_connection ();
1202	}	1470	}
1203		1471
1204	connection::~connection ()	1472	connection::~connection ()
1205	{	1473	{
1206	shutdown ();	1474	shutdown ();
1207	}	1475	}
1208		1476
		1477	void
1209	void connection_init ()	1478	connection_init ()
1210	{	1479	{
1211	auth_rate_limiter.clear ();	1480	auth_rate_limiter.clear ();
1212	reset_rate_limiter.clear ();	1481	reset_rate_limiter.clear ();
1213	}	1482	}
1214		1483

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Comparing gvpe/src/connection.C (file contents): Revision 1.36 by pcg, Sun May 30 17:36:00 2004 UTC vs. Revision 1.92 by root, Thu Feb 10 03:59:51 2011 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.36 by pcg, Sun May 30 17:36:00 2004 UTC vs.
Revision 1.92 by root, Thu Feb 10 03:59:51 2011 UTC