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

Comparing gvpe/src/connection.C (file contents):
Revision 1.37 by pcg, Fri Jun 11 15:56:34 2004 UTC vs.
Revision 1.93 by root, Tue Feb 15 13:31:23 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) 2003-2008,2010,2011 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,p%02x)", conf->nodename,
728	conf->id, rid, (const char *)rsi);	837	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		838	conf->protocols);
729		839
730	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	840	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
731		841
732	r->hmac_set (octx);	842	r->hmac_set (octx);
733	send_vpn_packet (r, si);	843	send_vpn_packet (r, si);
734		844
735	delete r;	845	delete r;
736	}	846	}
737		847
738	void	848	inline void
739	connection::establish_connection_cb (time_watcher &w)	849	connection::establish_connection_cb (ev::timer &w, int revents)
740	{	850	{
741	if (!ictx	851	if (!(ictx && octx)
742	&& conf != THISNODE	852	&& conf != THISNODE
743	&& connectmode != conf_node::C_NEVER	853	&& connectmode != conf_node::C_NEVER
744	&& connectmode != conf_node::C_DISABLED	854	&& connectmode != conf_node::C_DISABLED
745	&& NOW > w.at)	855	&& !w.is_active ())
746	{	856	{
747	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	857	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
748		858	// and stop trying. should probably be handled by a per-connection expire handler.
749	if (retry_int < conf->max_retry)	859	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		860	{
		861	reset_connection ();
750	retry_cnt++;	862	return;
751	else	863	}
752	retry_int = conf->max_retry;
753		864
754	w.start (NOW + retry_int);	865	last_establish_attempt = ev_now ();
		866
		867	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		868	? (retry_cnt & 3) + 1
		869	: 1 << (retry_cnt >> 2));
755		870
756	reset_si ();	871	reset_si ();
757		872
758	if (si.prot && !si.host)	873	bool slow = si.prot & PROT_SLOW;
		874
		875	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		876	{
		877	/TODO/ /* start the timer so we don't recurse endlessly */
		878	w.start (1);
759	vpn->send_connect_request (conf->id);	879	vpn->send_connect_request (this);
		880	}
760	else	881	else
761	{	882	{
		883	if (si.valid ())
		884	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		885	conf->nodename, (const char *)si);
		886
762	const sockinfo &dsi = forward_si (si);	887	const sockinfo &dsi = forward_si (si);
		888
		889	slow = slow \|\| (dsi.prot & PROT_SLOW);
763		890
764	if (dsi.valid () && auth_rate_limiter.can (dsi))	891	if (dsi.valid () && auth_rate_limiter.can (dsi))
765	{	892	{
766	if (retry_cnt < 4)	893	if (retry_cnt < 4)
767	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
768	else	895	else
769	send_ping (dsi, 0);	896	send_ping (dsi, 0);
770	}	897	}
771	}	898	}
		899
		900	retry_int *= slow ? 8. : 0.9;
		901
		902	if (retry_int < conf->max_retry)
		903	retry_cnt++;
		904	else
		905	retry_int = conf->max_retry;
		906
		907	w.start (retry_int);
772	}	908	}
773	}	909	}
774		910
775	void	911	void
776	connection::reset_connection ()	912	connection::reset_connection ()
…		…
779	{	915	{
780	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost"),
781	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si);
782		918
783	if (::conf.script_node_down)	919	if (::conf.script_node_down)
784	run_script (run_script_cb (this, &connection::script_node_down), false);	920	{
		921	run_script_cb *cb = new run_script_cb;
		922	cb->set<connection, &connection::script_node_down> (this);
		923	run_script_queued (cb, _("node-down command execution failed, continuing."));
		924	}
785	}	925	}
786		926
787	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
788	delete octx; octx = 0;	928	delete octx; octx = 0;
		929	#if ENABLE_DNS
		930	dnsv4_reset_connection ();
		931	#endif
789		932
790	si.host= 0;	933	si.host = 0;
791		934
792	last_activity = 0;	935	last_activity = 0.;
		936	//last_si_change = 0.;
793	retry_cnt = 0;	937	retry_cnt = 0;
794		938
795	rekey.stop ();	939	rekey.stop ();
796	keepalive.stop ();	940	keepalive.stop ();
797	establish_connection.stop ();	941	establish_connection.stop ();
…		…
804	send_reset (si);	948	send_reset (si);
805		949
806	reset_connection ();	950	reset_connection ();
807	}	951	}
808		952
809	void	953	// poor-man's rekeying
810	connection::rekey_cb (time_watcher &w)	954	inline void
		955	connection::rekey_cb (ev::timer &w, int revents)
811	{	956	{
812	reset_connection ();	957	reset_connection ();
813	establish_connection ();	958	establish_connection ();
814	}	959	}
815		960
…		…
831	if (oseqno > MAX_SEQNO)	976	if (oseqno > MAX_SEQNO)
832	rekey ();	977	rekey ();
833	}	978	}
834		979
835	void	980	void
		981	connection::post_inject_queue ()
		982	{
		983	// force a connection every now and when when packets are sent (max 1/s)
		984	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		985	establish_connection.stop ();
		986
		987	establish_connection ();
		988	}
		989
		990	void
836	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	991	connection::inject_data_packet (tap_packet *pkt)
837	{	992	{
838	if (ictx && octx)	993	if (ictx && octx)
839	send_data_packet (pkt);	994	send_data_packet (pkt);
840	else	995	else
841	{	996	{
842	if (!broadcast)//DDDD
843	data_queue.put (new tap_packet (*pkt));	997	data_queue.put (new tap_packet (*pkt));
844		998	post_inject_queue ();
845	establish_connection ();
846	}	999	}
847	}	1000	}
848		1001
		1002	void
849	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1003	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
850	{	1004	{
851	if (ictx && octx)	1005	if (ictx && octx)
852	send_vpn_packet (pkt, si, tos);	1006	send_vpn_packet (pkt, si, tos);
853	else	1007	else
854	{	1008	{
855	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1009	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
856		1010	post_inject_queue ();
857	establish_connection ();
858	}	1011	}
859	}	1012	}
860		1013
861	void	1014	void
862	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1015	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
863	{	1016	{
864	last_activity = NOW;	1017	last_activity = ev_now ();
865		1018
866	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1019	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
867	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1020	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1021
		1022	if (connectmode == conf_node::C_DISABLED)
		1023	return;
868		1024
869	switch (pkt->typ ())	1025	switch (pkt->typ ())
870	{	1026	{
871	case vpn_packet::PT_PING:	1027	case vpn_packet::PT_PING:
		1028	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1029
872	// we send pings instead of auth packets after some retries,	1030	// we send pings instead of auth packets after some retries,
873	// so reset the retry counter and establish a connection	1031	// so reset the retry counter and establish a connection
874	// when we receive a ping.	1032	// when we receive a ping.
875	if (!ictx)	1033	if (!ictx)
876	{	1034	{
877	if (auth_rate_limiter.can (rsi))	1035	if (auth_rate_limiter.can (rsi))
878	send_auth_request (rsi, true);	1036	send_auth_request (rsi, true);
879	}	1037	}
880	else	1038	else
		1039	// we would love to change the socket address here, but ping's aren't
		1040	// authenticated, so we best ignore it.
881	send_ping (rsi, 1); // pong	1041	send_ping (rsi, 1); // pong
882		1042
883	break;	1043	break;
884		1044
885	case vpn_packet::PT_PONG:	1045	case vpn_packet::PT_PONG:
		1046	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1047
		1048	// a PONG might mean that the other side doesn't really know
		1049	// about our desire for communication.
		1050	establish_connection ();
886	break;	1051	break;
887		1052
888	case vpn_packet::PT_RESET:	1053	case vpn_packet::PT_RESET:
889	{	1054	{
890	reset_connection ();	1055	reset_connection ();
891		1056
892	config_packet p = (config_packet ) pkt;	1057	config_packet p = (config_packet ) pkt;
893		1058
894	if (!p->chk_config ())	1059	if (!p->chk_config ())
895	{	1060	{
896	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1061	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
897	conf->nodename, (const char *)rsi);	1062	conf->nodename, (const char *)rsi);
898	connectmode = conf_node::C_DISABLED;	1063	connectmode = conf_node::C_DISABLED;
899	}	1064	}
900	else if (connectmode == conf_node::C_ALWAYS)	1065	else if (connectmode == conf_node::C_ALWAYS)
901	establish_connection ();	1066	establish_connection ();
…		…
903	break;	1068	break;
904		1069
905	case vpn_packet::PT_AUTH_REQ:	1070	case vpn_packet::PT_AUTH_REQ:
906	if (auth_rate_limiter.can (rsi))	1071	if (auth_rate_limiter.can (rsi))
907	{	1072	{
908	auth_req_packet p = (auth_req_packet ) pkt;	1073	auth_req_packet p = (auth_req_packet )pkt;
909		1074
910	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1075	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1076	conf->nodename, p->initiate ? "initiate" : "reply",
		1077	p->protocols, p->features);
911		1078
912	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1079	if (p->chk_config ()
		1080	&& (!memcmp (p->magic, MAGIC_OLD, 8) \|\| !memcmp (p->magic, MAGIC, 8)))
913	{	1081	{
914	if (p->prot_minor != PROTOCOL_MINOR)	1082	if (p->prot_minor != PROTOCOL_MINOR)
915	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1083	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
916	conf->nodename, (const char *)rsi,	1084	conf->nodename, (const char *)rsi,
917	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1085	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
932	delete octx;	1100	delete octx;
933		1101
934	octx = new crypto_ctx (k, 1);	1102	octx = new crypto_ctx (k, 1);
935	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1103	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
936		1104
937	// compatibility code, remove when no longer required
938	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
939
940	conf->protocols = p->protocols;	1105	conf->protocols = p->protocols;
941	features = p->features & config_packet::get_features ();	1106	features = p->features & config_packet::get_features ();
942		1107
943	send_auth_response (rsi, p->id, k);	1108	send_auth_response (rsi, p->id, k);
944		1109
…		…
946		1111
947	break;	1112	break;
948	}	1113	}
949	}	1114	}
950	else	1115	else
951	slog (L_WARN, _("%s(%s): protocol mismatch"),	1116	slog (L_WARN, _("%s(%s): protocol mismatch."),
952	conf->nodename, (const char *)rsi);	1117	conf->nodename, (const char *)rsi);
953		1118
954	send_reset (rsi);	1119	send_reset (rsi);
955	}	1120	}
956		1121
957	break;	1122	break;
958		1123
959	case vpn_packet::PT_AUTH_RES:	1124	case vpn_packet::PT_AUTH_RES:
960	{	1125	{
961	auth_res_packet p = (auth_res_packet ) pkt;	1126	auth_res_packet p = (auth_res_packet )pkt;
962		1127
963	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1128	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
964		1129
965	if (p->chk_config ())	1130	if (p->chk_config ())
966	{	1131	{
967	if (p->prot_minor != PROTOCOL_MINOR)	1132	if (p->prot_minor != PROTOCOL_MINOR)
968	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1133	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
971		1136
972	rsachallenge chg;	1137	rsachallenge chg;
973		1138
974	if (!rsa_cache.find (p->id, chg))	1139	if (!rsa_cache.find (p->id, chg))
975	{	1140	{
976	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
977	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
978	break;	1143	break;
979	}	1144	}
980	else	1145	else
981	{	1146	{
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	crypto_ctx *cctx = new crypto_ctx (chg, 0);
983		1148
984	if (!p->hmac_chk (cctx))	1149	if (!p->hmac_chk (cctx))
985	{	1150	{
986	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1151	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
987	"could be an attack, or just corruption or a synchronization error"),	1152	"could be an attack, or just corruption or a synchronization error."),
988	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
989	break;	1154	break;
990	}	1155	}
991	else	1156	else
992	{	1157	{
…		…
1003	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1168	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1004		1169
1005	si = rsi;	1170	si = rsi;
1006	protocol = rsi.prot;	1171	protocol = rsi.prot;
1007		1172
		1173	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1174	conf->nodename, (const char *)rsi,
		1175	is_direct ? "direct" : "forwarded",
		1176	p->prot_major, p->prot_minor);
		1177
1008	connection_established ();	1178	connection_established ();
1009		1179
1010	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1011	conf->nodename, (const char *)rsi,
1012	p->prot_major, p->prot_minor);
1013
1014	if (::conf.script_node_up)	1180	if (::conf.script_node_up)
1015	run_script (run_script_cb (this, &connection::script_node_up), false);	1181	{
		1182	run_script_cb *cb = new run_script_cb;
		1183	cb->set<connection, &connection::script_node_up> (this);
		1184	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1185	}
1016		1186
1017	break;	1187	break;
1018	}	1188	}
1019	else	1189	else
1020	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1190	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1021	conf->nodename, (const char *)rsi);	1191	conf->nodename, (const char *)rsi);
1022	}	1192	}
1023		1193
1024	delete cctx;	1194	delete cctx;
1025	}	1195	}
…		…
1041	{	1211	{
1042	vpndata_packet p = (vpndata_packet )pkt;	1212	vpndata_packet p = (vpndata_packet )pkt;
1043		1213
1044	if (!p->hmac_chk (ictx))	1214	if (!p->hmac_chk (ictx))
1045	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1215	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1046	"could be an attack, or just corruption or a synchronization error"),	1216	"could be an attack, or just corruption or a synchronization error."),
1047	conf->nodename, (const char *)rsi);	1217	conf->nodename, (const char *)rsi);
1048	else	1218	else
1049	{	1219	{
1050	u32 seqno;	1220	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1221	tap_packet *d = p->unpack (this, seqno);
		1222	int seqclass = iseqno.seqno_classify (seqno);
1052		1223
1053	if (iseqno.recv_ok (seqno))	1224	if (seqclass == 0) // ok
1054	{	1225	{
1055	vpn->tap->send (d);	1226	vpn->tap->send (d);
1056		1227
1057	if (si != rsi)	1228	if (si != rsi)
1058	{	1229	{
1059	// fast re-sync on connection changes, useful especially for tcp/ip	1230	// fast re-sync on source address changes, useful especially for tcp/ip
		1231	//if (last_si_change < ev_now () + 5.)
1060	si = rsi;	1232	// {
1061
1062	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1233	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1063	conf->nodename, (const char )si, (const char )rsi);	1234	conf->nodename, (const char )si, (const char )rsi);
		1235
		1236	si = rsi;
		1237
		1238	if (::conf.script_node_change)
		1239	{
		1240	run_script_cb *cb = new run_script_cb;
		1241	cb->set<connection, &connection::script_node_change> (this);
		1242	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1243	}
		1244
		1245	// }
		1246	//else
		1247	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1248	// conf->nodename, (const char )si, (const char )rsi);
1064	}	1249	}
		1250	}
		1251	else if (seqclass == 1) // far history
		1252	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1253	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1254	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1255	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1256	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1257	else if (seqclass == 3) // reset
		1258	{
		1259	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1260	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1261	send_reset (rsi);
1065	}	1262	}
1066		1263
1067	delete d;	1264	delete d;
1068	break;	1265	break;
1069	}	1266	}
…		…
1073	break;	1270	break;
1074		1271
1075	case vpn_packet::PT_CONNECT_REQ:	1272	case vpn_packet::PT_CONNECT_REQ:
1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1273	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1077	{	1274	{
1078	connect_req_packet p = (connect_req_packet ) pkt;	1275	connect_req_packet p = (connect_req_packet )pkt;
1079		1276
1080	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1277	if (p->id > 0 && p->id <= vpn->conns.size ())
1081	connection *c = vpn->conns[p->id - 1];
1082	conf->protocols = p->protocols;
1083
1084	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1085	conf->id, p->id, c->ictx && c->octx);
1086
1087	if (c->ictx && c->octx)
1088	{	1278	{
		1279	connection *c = vpn->conns[p->id - 1];
		1280	conf->protocols = p->protocols;
		1281
		1282	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1283	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1284	p->protocols,
		1285	c->ictx && c->octx);
		1286
		1287	if (c->ictx && c->octx)
		1288	{
1089	// send connect_info packets to both sides, in case one is	1289	// send connect_info packets to both sides, in case one is
1090	// behind a nat firewall (or both ;)	1290	// behind a nat firewall (or both ;)
1091	c->send_connect_info (conf->id, si, conf->protocols);	1291	c->send_connect_info (conf->id, si, conf->protocols);
1092	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1292	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1293	}
		1294	else
		1295	c->establish_connection ();
1093	}	1296	}
1094	else	1297	else
1095	c->establish_connection ();	1298	slog (L_WARN,
		1299	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1300	p->id);
1096	}	1301	}
1097		1302
1098	break;	1303	break;
1099		1304
1100	case vpn_packet::PT_CONNECT_INFO:	1305	case vpn_packet::PT_CONNECT_INFO:
1101	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1306	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1102	{	1307	{
1103	connect_info_packet p = (connect_info_packet ) pkt;	1308	connect_info_packet p = (connect_info_packet )pkt;
1104		1309
1105	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1310	if (p->id > 0 && p->id <= vpn->conns.size ())
1106		1311	{
1107	connection *c = vpn->conns[p->id - 1];	1312	connection *c = vpn->conns[p->id - 1];
1108		1313
1109	c->conf->protocols = p->protocols;	1314	c->conf->protocols = p->protocols;
1110	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1315	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1111	p->si.upgrade_protocol (protocol, c->conf);	1316	p->si.upgrade_protocol (protocol, c->conf);
1112		1317
1113	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1318	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,p%02x) [%d]",
1114	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1319	conf->nodename,
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si,
		1322	p->protocols,
		1323	!c->ictx && !c->octx);
1115		1324
1116	const sockinfo &dsi = forward_si (p->si);	1325	const sockinfo &dsi = forward_si (p->si);
1117		1326
1118	if (dsi.valid ())	1327	if (dsi.valid ())
1119	c->send_auth_request (dsi, true);	1328	c->send_auth_request (dsi, true);
		1329	}
		1330	else
		1331	slog (L_WARN,
		1332	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1333	p->id);
1120	}	1334	}
1121		1335
1122	break;	1336	break;
1123		1337
1124	default:	1338	default:
1125	send_reset (rsi);	1339	send_reset (rsi);
1126	break;	1340	break;
1127	}	1341	}
1128	}	1342	}
1129		1343
1130	void connection::keepalive_cb (time_watcher &w)	1344	inline void
		1345	connection::keepalive_cb (ev::timer &w, int revents)
1131	{	1346	{
1132	if (NOW >= last_activity + ::conf.keepalive + 30)	1347	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1133	{	1348	{
1134	reset_connection ();	1349	reset_connection ();
1135	establish_connection ();	1350	establish_connection ();
1136	}	1351	}
1137	else if (NOW < last_activity + ::conf.keepalive)	1352	else if (ev_now () < last_activity + ::conf.keepalive)
1138	w.start (last_activity + ::conf.keepalive);	1353	w.start (last_activity + ::conf.keepalive - ev::now ());
1139	else if (conf->connectmode != conf_node::C_ONDEMAND	1354	else if (conf->connectmode != conf_node::C_ONDEMAND
1140	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1355	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1141	{	1356	{
1142	send_ping (si);	1357	send_ping (si);
1143	w.start (NOW + 5);	1358	w.start (3);
1144	}	1359	}
1145	else if (NOW < last_activity + ::conf.keepalive + 10)	1360	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1146	// hold ondemand connections implicitly a few seconds longer	1361	// hold ondemand connections implicitly a few seconds longer
1147	// should delete octx, though, or something like that ;)	1362	// should delete octx, though, or something like that ;)
1148	w.start (last_activity + ::conf.keepalive + 10);	1363	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1149	else	1364	else
1150	reset_connection ();	1365	reset_connection ();
1151	}	1366	}
1152		1367
		1368	void
1153	void connection::send_connect_request (int id)	1369	connection::send_connect_request (int id)
1154	{	1370	{
1155	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1371	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1156		1372
1157	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1373	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1374	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1375	THISNODE->protocols);
1158	p->hmac_set (octx);	1376	p->hmac_set (octx);
1159	send_vpn_packet (p, si);	1377	send_vpn_packet (p, si);
1160		1378
1161	delete p;	1379	delete p;
1162	}	1380	}
1163		1381
1164	void connection::script_node ()	1382	void
		1383	connection::script_init_env (const char *ext)
1165	{	1384	{
1166	vpn->script_if_up ();
1167
1168	char *env;	1385	char *env;
		1386	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1387	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1388	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1389	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1390	conf->id & 0xff); putenv (env);
		1391	}
		1392
		1393	void
		1394	connection::script_init_connect_env ()
		1395	{
		1396	vpn->script_init_env ();
		1397
		1398	char *env;
1169	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1399	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1400	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1170	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1401	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1171	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1402	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1172	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1403	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1173	}	1404	}
1174		1405
		1406	inline const char *
1175	const char *connection::script_node_up ()	1407	connection::script_node_up ()
1176	{	1408	{
1177	script_node ();	1409	script_init_connect_env ();
1178		1410
1179	putenv ("STATE=up");	1411	putenv ((char *)"STATE=up");
1180		1412
		1413	char *filename;
		1414	asprintf (&filename,
		1415	"%s/%s",
		1416	confbase,
1181	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1417	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1182	}
1183		1418
		1419	return filename;
		1420	}
		1421
		1422	inline const char *
		1423	connection::script_node_change ()
		1424	{
		1425	script_init_connect_env ();
		1426
		1427	putenv ((char *)"STATE=change");
		1428
		1429	char *filename;
		1430	asprintf (&filename,
		1431	"%s/%s",
		1432	confbase,
		1433	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1434
		1435	return filename;
		1436	}
		1437
		1438	inline const char *
1184	const char *connection::script_node_down ()	1439	connection::script_node_down ()
1185	{	1440	{
1186	script_node ();	1441	script_init_connect_env ();
1187		1442
1188	putenv ("STATE=down");	1443	putenv ((char *)"STATE=down");
1189		1444
1190	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1445	char *filename;
1191	}	1446	asprintf (&filename,
		1447	"%s/%s",
		1448	confbase,
		1449	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1192		1450
		1451	return filename;
		1452	}
		1453
1193	connection::connection(struct vpn *vpn_)	1454	connection::connection (struct vpn vpn, conf_node conf)
1194	: vpn(vpn_)	1455	: vpn(vpn), conf(conf),
1195	, rekey (this, &connection::rekey_cb)	1456	#if ENABLE_DNS
1196	, keepalive (this, &connection::keepalive_cb)	1457	dns (0),
		1458	#endif
		1459	data_queue(conf->max_ttl, conf->max_queue + 1),
		1460	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1461	{
		1462	rekey .set<connection, &connection::rekey_cb > (this);
		1463	keepalive .set<connection, &connection::keepalive_cb > (this);
1197	, establish_connection (this, &connection::establish_connection_cb)	1464	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1198	{	1465
		1466	last_establish_attempt = 0.;
1199	octx = ictx = 0;	1467	octx = ictx = 0;
1200	retry_cnt = 0;
1201		1468
1202	connectmode = conf_node::C_ALWAYS; // initial setting	1469	connectmode = conf->connectmode;
		1470
		1471	// queue a dummy packet to force an initial connection attempt
		1472	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1473	vpn_queue.put (new net_packet);
		1474
1203	reset_connection ();	1475	reset_connection ();
1204	}	1476	}
1205		1477
1206	connection::~connection ()	1478	connection::~connection ()
1207	{	1479	{
1208	shutdown ();	1480	shutdown ();
1209	}	1481	}
1210		1482
		1483	void
1211	void connection_init ()	1484	connection_init ()
1212	{	1485	{
1213	auth_rate_limiter.clear ();	1486	auth_rate_limiter.clear ();
1214	reset_rate_limiter.clear ();	1487	reset_rate_limiter.clear ();
1215	}	1488	}
1216		1489

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Comparing gvpe/src/connection.C (file contents): Revision 1.37 by pcg, Fri Jun 11 15:56:34 2004 UTC vs. Revision 1.93 by root, Tue Feb 15 13:31:23 2011 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.37 by pcg, Fri Jun 11 15:56:34 2004 UTC vs.
Revision 1.93 by root, Tue Feb 15 13:31:23 2011 UTC