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

Comparing gvpe/src/connection.C (file contents):
Revision 1.61 by pcg, Sat Nov 10 19:43:37 2007 UTC vs.
Revision 1.82 by pcg, Fri Aug 15 18:35:24 2008 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	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
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	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
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	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
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
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>
45	#define ULTRA_FAST 1	57	#define ULTRA_FAST 1
46	#define HLOG 15	58	#define HLOG 15
47	#include "lzf/lzf.h"	59	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	60	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	61	#include "lzf/lzf_d.c"
		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88
		89	// despite the fancy name, this is quite a hack
		90	static void
		91	run_script_queued (run_script_cb cb, const char warnmsg)
		92	{
		93	rs_queue.push (std::make_pair (cb, warnmsg));
		94
		95	if (!rs_child_ev.is_active ())
		96	{
		97	rs_child_ev.set<rs_child_cb> ();
		98	rs_child_ev ();
		99	}
		100	}
		101
		102	//////////////////////////////////////////////////////////////////////////////
50		103
51	struct crypto_ctx	104	struct crypto_ctx
52	{	105	{
53	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	107	HMAC_CTX hctx;
…		…
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));	135	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	136	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);	137	EVP_MD_CTX_cleanup (&ctx);
85	}	138	}
86		139
87	struct rsa_entry {	140	struct rsa_entry
		141	{
88	tstamp expire;	142	tstamp expire;
89	rsaid id;	143	rsaid id;
90	rsachallenge chg;	144	rsachallenge chg;
91	};	145	};
92		146
93	struct rsa_cache : list<rsa_entry>	147	struct rsa_cache : list<rsa_entry>
94	{	148	{
95	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;	149	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
96		150
97	bool find (const rsaid &id, rsachallenge &chg)	151	bool find (const rsaid &id, rsachallenge &chg)
98	{	152	{
99	for (iterator i = begin (); i != end (); ++i)	153	for (iterator i = begin (); i != end (); ++i)
100	{	154	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev::ev_now ())	155	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
102	{	156	{
103	memcpy (&chg, &i->chg, sizeof chg);	157	memcpy (&chg, &i->chg, sizeof chg);
104		158
105	erase (i);	159	erase (i);
106	return true;	160	return true;
…		…
118	rsa_entry e;	172	rsa_entry e;
119		173
120	RAND_bytes ((unsigned char *)&id, sizeof id);	174	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);	175	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122		176
123	e.expire = ev::ev_now () + RSA_TTL;	177	e.expire = ev_now () + RSA_TTL;
124	e.id = id;	178	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);	179	memcpy (&e.chg, &chg, sizeof chg);
126		180
127	push_back (e);	181	push_back (e);
128		182
129	if (!cleaner.is_active ())	183	if (!cleaner.is_active ())
130	cleaner.again ();	184	cleaner.again ();
131	}	185	}
132		186
133	rsa_cache ()	187	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{	188	{
		189	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
136	cleaner.set (RSA_TTL, RSA_TTL);	190	cleaner.set (RSA_TTL, RSA_TTL);
137	}	191	}
138		192
139	} rsa_cache;	193	} rsa_cache;
140		194
…		…
143	if (empty ())	197	if (empty ())
144	w.stop ();	198	w.stop ();
145	else	199	else
146	{	200	{
147	for (iterator i = begin (); i != end (); )	201	for (iterator i = begin (); i != end (); )
148	if (i->expire <= ev::ev_now ())	202	if (i->expire <= ev_now ())
149	i = erase (i);	203	i = erase (i);
150	else	204	else
151	++i;	205	++i;
152	}	206	}
153	}	207	}
154		208
155	//////////////////////////////////////////////////////////////////////////////	209	//////////////////////////////////////////////////////////////////////////////
156		210
157	void pkt_queue::put (net_packet *p)	211	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		212	: max_ttl (max_ttl), max_queue (max_queue)
158	{	213	{
159	if (queue[i])	214	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		215
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;	216	i = 0;
187	j = 0;	217	j = 0;
		218
		219	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	220	}
189		221
190	pkt_queue::~pkt_queue ()	222	pkt_queue::~pkt_queue ()
191	{	223	{
192	for (i = QUEUEDEPTH; --i > 0; )	224	while (net_packet *p = get ())
		225	delete p;
		226
193	delete queue[i];	227	delete [] queue;
194	}	228	}
195		229
		230	void pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void pkt_queue::put (net_packet *p)
		252	{
		253	ev_tstamp now = ev_now ();
		254
		255	// start expiry timer
		256	if (empty ())
		257	expire.start (max_ttl);
		258
		259	int ni = i + 1 == max_queue ? 0 : i + 1;
		260
		261	if (ni == j)
		262	delete get ();
		263
		264	queue[i].pkt = p;
		265	queue[i].tstamp = now;
		266
		267	i = ni;
		268	}
		269
		270	net_packet *pkt_queue::get ()
		271	{
		272	if (empty ())
		273	return 0;
		274
		275	net_packet *p = queue[j].pkt;
		276	queue[j].pkt = 0;
		277
		278	j = j + 1 == max_queue ? 0 : j + 1;
		279
		280	return p;
		281	}
		282
196	struct net_rateinfo {	283	struct net_rateinfo
		284	{
197	u32 host;	285	u32 host;
198	double pcnt, diff;	286	double pcnt, diff;
199	tstamp last;	287	tstamp last;
200	};	288	};
201		289
…		…
220	iterator i;	308	iterator i;
221		309
222	for (i = begin (); i != end (); )	310	for (i = begin (); i != end (); )
223	if (i->host == host)	311	if (i->host == host)
224	break;	312	break;
225	else if (i->last < ev::ev_now () - NRL_EXPIRE)	313	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	314	i = erase (i);
227	else	315	else
228	i++;	316	i++;
229		317
230	if (i == end ())	318	if (i == end ())
…		…
232	net_rateinfo ri;	320	net_rateinfo ri;
233		321
234	ri.host = host;	322	ri.host = host;
235	ri.pcnt = 1.;	323	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	324	ri.diff = NRL_MAXDIF;
237	ri.last = ev::ev_now ();	325	ri.last = ev_now ();
238		326
239	push_front (ri);	327	push_front (ri);
240		328
241	return true;	329	return true;
242	}	330	}
…		…
244	{	332	{
245	net_rateinfo ri (*i);	333	net_rateinfo ri (*i);
246	erase (i);	334	erase (i);
247		335
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	336	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (ev::ev_now () - ri.last);	337	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		338
251	ri.last = ev::ev_now ();	339	ri.last = ev_now ();
252		340
253	double dif = ri.diff / ri.pcnt;	341	double dif = ri.diff / ri.pcnt;
254		342
255	bool send = dif > NRL_CUTOFF;	343	bool send = dif > NRL_CUTOFF;
256		344
…		…
584	/////////////////////////////////////////////////////////////////////////////	672	/////////////////////////////////////////////////////////////////////////////
585		673
586	void	674	void
587	connection::connection_established ()	675	connection::connection_established ()
588	{	676	{
589	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	677	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
590		678
591	if (ictx && octx)	679	if (ictx && octx)
592	{	680	{
593	connectmode = conf->connectmode;
594
595	// make sure rekeying timeouts are slightly asymmetric	681	// make sure rekeying timeouts are slightly asymmetric
596	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	682	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
597	rekey.start (rekey_interval, rekey_interval);	683	rekey.start (rekey_interval, rekey_interval);
598	keepalive.start (::conf.keepalive);	684	keepalive.start (::conf.keepalive);
599		685
600	// send queued packets	686	// send queued packets
601	if (ictx && octx)	687	if (ictx && octx)
602	{	688	{
603	while (tap_packet p = (tap_packet )data_queue.get ())	689	while (tap_packet p = (tap_packet )data_queue.get ())
604	{	690	{
605	send_data_packet (p);	691	if (p->len) send_data_packet (p);
606	delete p;	692	delete p;
607	}	693	}
608		694
609	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	695	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
610	{	696	{
611	send_vpn_packet (p, si, IPTOS_RELIABILITY);	697	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
612	delete p;	698	delete p;
613	}	699	}
614	}	700	}
		701
		702	vpn->connection_established (this);
615	}	703	}
616	else	704	else
617	{	705	{
618	retry_cnt = 0;	706	retry_cnt = 0;
619	establish_connection.start (5);	707	establish_connection.start (5);
…		…
623	}	711	}
624		712
625	void	713	void
626	connection::reset_si ()	714	connection::reset_si ()
627	{	715	{
		716	if (vpn->can_direct (THISNODE, conf))
628	protocol = best_protocol (THISNODE->protocols & conf->protocols);	717	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
629		718	else
630	// mask out protocols we cannot establish
631	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
632	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
633	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
634
635	if (protocol
636	&& (!conf->can_direct (THISNODE)
637	\|\| !THISNODE->can_direct (conf)))
638	{	719	{
639	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	720	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
640	protocol = 0;	721	protocol = 0;
641	}	722	}
642		723
643	si.set (conf, protocol);	724	si.set (conf, protocol);
		725
		726	is_direct = si.valid ();
644	}	727	}
645		728
646	// ensure sockinfo is valid, forward if necessary	729	// ensure sockinfo is valid, forward if necessary
647	const sockinfo &	730	const sockinfo &
648	connection::forward_si (const sockinfo &si) const	731	connection::forward_si (const sockinfo &si) const
649	{	732	{
650	if (!si.valid ())	733	if (!si.valid ())
651	{	734	{
652	connection *r = vpn->find_router ();	735	connection *r = vpn->find_router_for (this);
653		736
654	if (r)	737	if (r)
655	{	738	{
656	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	739	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
657	conf->nodename, r->conf->nodename, (const char *)r->si);	740	conf->nodename, r->conf->nodename);
658	return r->si;	741	return r->si;
659	}	742	}
660	else	743	else
661	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	744	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
662	conf->nodename);	745	conf->nodename);
663	}	746	}
664		747
665	return si;	748	return si;
666	}	749	}
…		…
676	connection::send_ping (const sockinfo &si, u8 pong)	759	connection::send_ping (const sockinfo &si, u8 pong)
677	{	760	{
678	ping_packet *pkt = new ping_packet;	761	ping_packet *pkt = new ping_packet;
679		762
680	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	763	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		764
		765	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		766
681	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	767	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
682		768
683	delete pkt;	769	delete pkt;
684	}	770	}
685		771
…		…
704		790
705	rsachallenge chg;	791	rsachallenge chg;
706	rsa_cache.gen (pkt->id, chg);	792	rsa_cache.gen (pkt->id, chg);
707	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	793	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
708		794
709	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	795	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
710		796
711	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	797	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
712		798
713	delete pkt;	799	delete pkt;
714	}	800	}
…		…
722		808
723	rsa_hash (id, chg, pkt->response);	809	rsa_hash (id, chg, pkt->response);
724		810
725	pkt->hmac_set (octx);	811	pkt->hmac_set (octx);
726		812
727	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	813	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
728		814
729	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
730		816
731	delete pkt;	817	delete pkt;
732	}	818	}
733		819
734	void	820	void
735	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	821	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
736	{	822	{
737	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	823	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
738	conf->id, rid, (const char *)rsi);	824	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
739		825
740	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	826	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
741		827
742	r->hmac_set (octx);	828	r->hmac_set (octx);
743	send_vpn_packet (r, si);	829	send_vpn_packet (r, si);
744		830
745	delete r;	831	delete r;
746	}	832	}
747		833
748	void	834	inline void
749	connection::establish_connection_cb (ev::timer &w, int revents)	835	connection::establish_connection_cb (ev::timer &w, int revents)
750	{	836	{
751	if (!ictx	837	if (!ictx
752	&& conf != THISNODE	838	&& conf != THISNODE
753	&& connectmode != conf_node::C_NEVER	839	&& connectmode != conf_node::C_NEVER
754	&& connectmode != conf_node::C_DISABLED	840	&& connectmode != conf_node::C_DISABLED
755	&& !w.is_active ())	841	&& !w.is_active ())
756	{	842	{
		843	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		844	// and stop trying. should probably be handled by a per-connection expire handler.
		845	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		846	{
		847	reset_connection ();
		848	return;
		849	}
		850
		851	last_establish_attempt = ev_now ();
		852
757	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	853	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
758	? (retry_cnt & 3) + 1	854	? (retry_cnt & 3) + 1
759	: 1 << (retry_cnt >> 2));	855	: 1 << (retry_cnt >> 2));
760		856
761	reset_si ();	857	reset_si ();
762		858
763	bool slow = si.prot & PROT_SLOW;	859	bool slow = si.prot & PROT_SLOW;
764		860
765	if (si.prot && !si.host)	861	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
766	{	862	{
767	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
768	/TODO/ /* start the timer so we don't recurse endlessly */	863	/TODO/ /* start the timer so we don't recurse endlessly */
769	w.start (1);	864	w.start (1);
770	vpn->send_connect_request (conf->id);	865	vpn->send_connect_request (this);
771	}	866	}
772	else	867	else
773	{	868	{
774	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	869	if (si.valid ())
		870	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		871	conf->nodename, (const char *)si);
775		872
776	const sockinfo &dsi = forward_si (si);	873	const sockinfo &dsi = forward_si (si);
777		874
778	slow = slow \|\| (dsi.prot & PROT_SLOW);	875	slow = slow \|\| (dsi.prot & PROT_SLOW);
779		876
…		…
784	else	881	else
785	send_ping (dsi, 0);	882	send_ping (dsi, 0);
786	}	883	}
787	}	884	}
788		885
789	retry_int *= slow ? 8. : 0.7;	886	retry_int *= slow ? 8. : 0.9;
790		887
791	if (retry_int < conf->max_retry)	888	if (retry_int < conf->max_retry)
792	retry_cnt++;	889	retry_cnt++;
793	else	890	else
794	retry_int = conf->max_retry;	891	retry_int = conf->max_retry;
…		…
804	{	901	{
805	slog (L_INFO, _("%s(%s): connection lost"),	902	slog (L_INFO, _("%s(%s): connection lost"),
806	conf->nodename, (const char *)si);	903	conf->nodename, (const char *)si);
807		904
808	if (::conf.script_node_down)	905	if (::conf.script_node_down)
809	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	906	{
		907	run_script_cb *cb = new run_script_cb;
		908	cb->set<connection, &connection::script_node_down> (this);
810	slog (L_WARN, _("node-down command execution failed, continuing."));	909	run_script_queued (cb, _("node-down command execution failed, continuing."));
		910	}
811	}	911	}
812		912
813	delete ictx; ictx = 0;	913	delete ictx; ictx = 0;
814	delete octx; octx = 0;	914	delete octx; octx = 0;
815	#if ENABLE_DNS	915	#if ENABLE_DNS
816	dnsv4_reset_connection ();	916	dnsv4_reset_connection ();
817	#endif	917	#endif
818		918
819	si.host = 0;	919	si.host = 0;
820		920
821	last_activity = 0;	921	last_activity = 0.;
		922	//last_si_change = 0.;
822	retry_cnt = 0;	923	retry_cnt = 0;
823		924
824	rekey.stop ();	925	rekey.stop ();
825	keepalive.stop ();	926	keepalive.stop ();
826	establish_connection.stop ();	927	establish_connection.stop ();
…		…
833	send_reset (si);	934	send_reset (si);
834		935
835	reset_connection ();	936	reset_connection ();
836	}	937	}
837		938
838	void	939	// poor-man's rekeying
		940	inline void
839	connection::rekey_cb (ev::timer &w, int revents)	941	connection::rekey_cb (ev::timer &w, int revents)
840	{	942	{
841	reset_connection ();	943	reset_connection ();
842	establish_connection ();	944	establish_connection ();
843	}	945	}
…		…
860	if (oseqno > MAX_SEQNO)	962	if (oseqno > MAX_SEQNO)
861	rekey ();	963	rekey ();
862	}	964	}
863		965
864	void	966	void
		967	connection::post_inject_queue ()
		968	{
		969	// force a connection every now and when when packets are sent (max 1/s)
		970	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		971	establish_connection.stop ();
		972
		973	establish_connection ();
		974	}
		975
		976	void
865	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	977	connection::inject_data_packet (tap_packet *pkt)
866	{	978	{
867	if (ictx && octx)	979	if (ictx && octx)
868	send_data_packet (pkt);	980	send_data_packet (pkt);
869	else	981	else
870	{	982	{
871	if (!broadcast)
872	data_queue.put (new tap_packet (*pkt));	983	data_queue.put (new tap_packet (*pkt));
873		984	post_inject_queue ();
874	establish_connection ();
875	}	985	}
876	}	986	}
877		987
878	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	988	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
879	{	989	{
880	if (ictx && octx)	990	if (ictx && octx)
881	send_vpn_packet (pkt, si, tos);	991	send_vpn_packet (pkt, si, tos);
882	else	992	else
883	{	993	{
884	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	994	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
885		995	post_inject_queue ();
886	establish_connection ();
887	}	996	}
888	}	997	}
889		998
890	void	999	void
891	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1000	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
892	{	1001	{
893	last_activity = ev::ev_now ();	1002	last_activity = ev_now ();
894		1003
895	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1004	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
896	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1005	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
897		1006
898	if (connectmode == conf_node::C_DISABLED)	1007	if (connectmode == conf_node::C_DISABLED)
899	return;	1008	return;
900		1009
901	switch (pkt->typ ())	1010	switch (pkt->typ ())
902	{	1011	{
903	case vpn_packet::PT_PING:	1012	case vpn_packet::PT_PING:
		1013	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1014
904	// we send pings instead of auth packets after some retries,	1015	// we send pings instead of auth packets after some retries,
905	// so reset the retry counter and establish a connection	1016	// so reset the retry counter and establish a connection
906	// when we receive a ping.	1017	// when we receive a ping.
907	if (!ictx)	1018	if (!ictx)
908	{	1019	{
909	if (auth_rate_limiter.can (rsi))	1020	if (auth_rate_limiter.can (rsi))
910	send_auth_request (rsi, true);	1021	send_auth_request (rsi, true);
911	}	1022	}
912	else	1023	else
		1024	// we would love to change thre socket address here, but ping's aren't
		1025	// authenticated, so we best ignore it.
913	send_ping (rsi, 1); // pong	1026	send_ping (rsi, 1); // pong
914		1027
915	break;	1028	break;
916		1029
917	case vpn_packet::PT_PONG:	1030	case vpn_packet::PT_PONG:
		1031	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
918	break;	1032	break;
919		1033
920	case vpn_packet::PT_RESET:	1034	case vpn_packet::PT_RESET:
921	{	1035	{
922	reset_connection ();	1036	reset_connection ();
923		1037
924	config_packet p = (config_packet ) pkt;	1038	config_packet p = (config_packet ) pkt;
925		1039
926	if (!p->chk_config ())	1040	if (!p->chk_config ())
927	{	1041	{
928	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1042	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
929	conf->nodename, (const char *)rsi);	1043	conf->nodename, (const char *)rsi);
930	connectmode = conf_node::C_DISABLED;	1044	connectmode = conf_node::C_DISABLED;
931	}	1045	}
932	else if (connectmode == conf_node::C_ALWAYS)	1046	else if (connectmode == conf_node::C_ALWAYS)
933	establish_connection ();	1047	establish_connection ();
…		…
937	case vpn_packet::PT_AUTH_REQ:	1051	case vpn_packet::PT_AUTH_REQ:
938	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
939	{	1053	{
940	auth_req_packet p = (auth_req_packet ) pkt;	1054	auth_req_packet p = (auth_req_packet ) pkt;
941		1055
942	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1056	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
943		1057
944	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1058	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
945	{	1059	{
946	if (p->prot_minor != PROTOCOL_MINOR)	1060	if (p->prot_minor != PROTOCOL_MINOR)
947	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1061	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
975		1089
976	break;	1090	break;
977	}	1091	}
978	}	1092	}
979	else	1093	else
980	slog (L_WARN, _("%s(%s): protocol mismatch"),	1094	slog (L_WARN, _("%s(%s): protocol mismatch."),
981	conf->nodename, (const char *)rsi);	1095	conf->nodename, (const char *)rsi);
982		1096
983	send_reset (rsi);	1097	send_reset (rsi);
984	}	1098	}
985		1099
986	break;	1100	break;
987		1101
988	case vpn_packet::PT_AUTH_RES:	1102	case vpn_packet::PT_AUTH_RES:
989	{	1103	{
990	auth_res_packet p = (auth_res_packet ) pkt;	1104	auth_res_packet p = (auth_res_packet )pkt;
991		1105
992	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1106	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
993		1107
994	if (p->chk_config ())	1108	if (p->chk_config ())
995	{	1109	{
996	if (p->prot_minor != PROTOCOL_MINOR)	1110	if (p->prot_minor != PROTOCOL_MINOR)
997	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1111	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
1000		1114
1001	rsachallenge chg;	1115	rsachallenge chg;
1002		1116
1003	if (!rsa_cache.find (p->id, chg))	1117	if (!rsa_cache.find (p->id, chg))
1004	{	1118	{
1005	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1119	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
1006	conf->nodename, (const char *)rsi);	1120	conf->nodename, (const char *)rsi);
1007	break;	1121	break;
1008	}	1122	}
1009	else	1123	else
1010	{	1124	{
1011	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1125	crypto_ctx *cctx = new crypto_ctx (chg, 0);
1012		1126
1013	if (!p->hmac_chk (cctx))	1127	if (!p->hmac_chk (cctx))
1014	{	1128	{
1015	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1129	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1016	"could be an attack, or just corruption or a synchronization error"),	1130	"could be an attack, or just corruption or a synchronization error."),
1017	conf->nodename, (const char *)rsi);	1131	conf->nodename, (const char *)rsi);
1018	break;	1132	break;
1019	}	1133	}
1020	else	1134	else
1021	{	1135	{
…		…
1032	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1146	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1033		1147
1034	si = rsi;	1148	si = rsi;
1035	protocol = rsi.prot;	1149	protocol = rsi.prot;
1036		1150
		1151	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1152	conf->nodename, (const char *)rsi,
		1153	is_direct ? "direct" : "forwarded",
		1154	p->prot_major, p->prot_minor);
		1155
1037	connection_established ();	1156	connection_established ();
1038		1157
1039	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1040	conf->nodename, (const char *)rsi,
1041	p->prot_major, p->prot_minor);
1042
1043	if (::conf.script_node_up)	1158	if (::conf.script_node_up)
1044	if (!run_script (run_script_cb (this, &connection::script_node_up), false))	1159	{
		1160	run_script_cb *cb = new run_script_cb;
		1161	cb->set<connection, &connection::script_node_up> (this);
1045	slog (L_WARN, _("node-up command execution failed, continuing."));	1162	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1163	}
1046		1164
1047	break;	1165	break;
1048	}	1166	}
1049	else	1167	else
1050	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1168	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1051	conf->nodename, (const char *)rsi);	1169	conf->nodename, (const char *)rsi);
1052	}	1170	}
1053		1171
1054	delete cctx;	1172	delete cctx;
1055	}	1173	}
…		…
1071	{	1189	{
1072	vpndata_packet p = (vpndata_packet )pkt;	1190	vpndata_packet p = (vpndata_packet )pkt;
1073		1191
1074	if (!p->hmac_chk (ictx))	1192	if (!p->hmac_chk (ictx))
1075	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1193	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1076	"could be an attack, or just corruption or a synchronization error"),	1194	"could be an attack, or just corruption or a synchronization error."),
1077	conf->nodename, (const char *)rsi);	1195	conf->nodename, (const char *)rsi);
1078	else	1196	else
1079	{	1197	{
1080	u32 seqno;	1198	u32 seqno;
1081	tap_packet *d = p->unpack (this, seqno);	1199	tap_packet *d = p->unpack (this, seqno);
		1200	int seqclass = iseqno.seqno_classify (seqno);
1082		1201
1083	if (iseqno.recv_ok (seqno))	1202	if (seqclass == 0) // ok
1084	{	1203	{
1085	vpn->tap->send (d);	1204	vpn->tap->send (d);
1086		1205
1087	if (si != rsi)	1206	if (si != rsi)
1088	{	1207	{
1089	// fast re-sync on source address changes, useful especially for tcp/ip	1208	// fast re-sync on source address changes, useful especially for tcp/ip
		1209	//if (last_si_change < ev_now () + 5.)
1090	si = rsi;	1210	// {
1091
1092	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1211	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1093	conf->nodename, (const char )si, (const char )rsi);	1212	conf->nodename, (const char )si, (const char )rsi);
		1213
		1214	si = rsi;
		1215	// }
		1216	//else
		1217	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1218	// conf->nodename, (const char )si, (const char )rsi);
1094	}	1219	}
		1220	}
		1221	else if (seqclass == 1) // far history
		1222	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1223	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1224	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1225	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1226	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1227	else if (seqclass == 3) // reset
		1228	{
		1229	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1230	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1231	send_reset (rsi);
1095	}	1232	}
1096		1233
1097	delete d;	1234	delete d;
1098	break;	1235	break;
1099	}	1236	}
…		…
1110	if (p->id > 0 && p->id <= vpn->conns.size ())	1247	if (p->id > 0 && p->id <= vpn->conns.size ())
1111	{	1248	{
1112	connection *c = vpn->conns[p->id - 1];	1249	connection *c = vpn->conns[p->id - 1];
1113	conf->protocols = p->protocols;	1250	conf->protocols = p->protocols;
1114		1251
1115	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1252	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
1116	conf->id, p->id, c->ictx && c->octx);	1253	conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
1117		1254
1118	if (c->ictx && c->octx)	1255	if (c->ictx && c->octx)
1119	{	1256	{
1120	// send connect_info packets to both sides, in case one is	1257	// send connect_info packets to both sides, in case one is
1121	// behind a nat firewall (or both ;)	1258	// behind a nat firewall (or both ;)
…		…
1144		1281
1145	c->conf->protocols = p->protocols;	1282	c->conf->protocols = p->protocols;
1146	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1283	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1147	p->si.upgrade_protocol (protocol, c->conf);	1284	p->si.upgrade_protocol (protocol, c->conf);
1148		1285
1149	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1286	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
		1287	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1150	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1288	(const char *)p->si, !c->ictx && !c->octx);
1151		1289
1152	const sockinfo &dsi = forward_si (p->si);	1290	const sockinfo &dsi = forward_si (p->si);
1153		1291
1154	if (dsi.valid ())	1292	if (dsi.valid ())
1155	c->send_auth_request (dsi, true);	1293	c->send_auth_request (dsi, true);
…		…
1166	send_reset (rsi);	1304	send_reset (rsi);
1167	break;	1305	break;
1168	}	1306	}
1169	}	1307	}
1170		1308
		1309	inline void
1171	void connection::keepalive_cb (ev::timer &w, int revents)	1310	connection::keepalive_cb (ev::timer &w, int revents)
1172	{	1311	{
1173	if (ev::ev_now () >= last_activity + ::conf.keepalive + 30)	1312	if (ev_now () >= last_activity + ::conf.keepalive + 30)
1174	{	1313	{
1175	reset_connection ();	1314	reset_connection ();
1176	establish_connection ();	1315	establish_connection ();
1177	}	1316	}
1178	else if (ev::ev_now () < last_activity + ::conf.keepalive)	1317	else if (ev_now () < last_activity + ::conf.keepalive)
1179	w.start (last_activity + ::conf.keepalive - ev::now ());	1318	w.start (last_activity + ::conf.keepalive - ev::now ());
1180	else if (conf->connectmode != conf_node::C_ONDEMAND	1319	else if (conf->connectmode != conf_node::C_ONDEMAND
1181	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1320	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1182	{	1321	{
1183	send_ping (si);	1322	send_ping (si);
1184	w.start (5);	1323	w.start (5);
1185	}	1324	}
1186	else if (ev::ev_now () < last_activity + ::conf.keepalive + 10)	1325	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1187	// hold ondemand connections implicitly a few seconds longer	1326	// hold ondemand connections implicitly a few seconds longer
1188	// should delete octx, though, or something like that ;)	1327	// should delete octx, though, or something like that ;)
1189	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1328	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1190	else	1329	else
1191	reset_connection ();	1330	reset_connection ();
…		…
1193		1332
1194	void connection::send_connect_request (int id)	1333	void connection::send_connect_request (int id)
1195	{	1334	{
1196	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1197		1336
1198	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename);
1199	p->hmac_set (octx);	1339	p->hmac_set (octx);
1200	send_vpn_packet (p, si);	1340	send_vpn_packet (p, si);
1201		1341
1202	delete p;	1342	delete p;
1203	}	1343	}
…		…
1221	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1222	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1223	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1224	}	1364	}
1225		1365
		1366	inline const char *
1226	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1227	{	1368	{
1228	script_init_connect_env ();	1369	script_init_connect_env ();
1229		1370
1230	putenv ((char *)"STATE=up");	1371	putenv ((char *)"STATE=up");
1231		1372
…		…
1236	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1237		1378
1238	return filename;	1379	return filename;
1239	}	1380	}
1240		1381
		1382	inline const char *
1241	const char *connection::script_node_down ()	1383	connection::script_node_down ()
1242	{	1384	{
1243	script_init_connect_env ();	1385	script_init_connect_env ();
1244		1386
1245	putenv ((char *)"STATE=down");	1387	putenv ((char *)"STATE=down");
1246		1388
…		…
1252		1394
1253	return filename;	1395	return filename;
1254	}	1396	}
1255		1397
1256	connection::connection (struct vpn vpn, conf_node conf)	1398	connection::connection (struct vpn vpn, conf_node conf)
1257	: vpn(vpn), conf(conf)	1399	: vpn(vpn), conf(conf),
1258	, rekey (this, &connection::rekey_cb)
1259	, keepalive (this, &connection::keepalive_cb)
1260	, establish_connection (this, &connection::establish_connection_cb)
1261	#if ENABLE_DNS	1400	#if ENABLE_DNS
1262	, dns (0)	1401	dns (0),
1263	#endif	1402	#endif
		1403	data_queue(conf->max_ttl, conf->max_queue + 1),
		1404	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1264	{	1405	{
		1406	rekey .set<connection, &connection::rekey_cb > (this);
		1407	keepalive .set<connection, &connection::keepalive_cb > (this);
		1408	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1409
		1410	last_establish_attempt = 0.;
1265	octx = ictx = 0;	1411	octx = ictx = 0;
1266	retry_cnt = 0;
1267		1412
1268	if (!conf->protocols) // make sure some protocol is enabled	1413	if (!conf->protocols) // make sure some protocol is enabled
1269	conf->protocols = PROT_UDPv4;	1414	conf->protocols = PROT_UDPv4;
1270		1415
1271	connectmode = conf_node::C_ALWAYS; // initial setting	1416	connectmode = conf->connectmode;
		1417
		1418	// queue a dummy packet to force an initial connection attempt
		1419	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1420	vpn_queue.put (new net_packet);
		1421
1272	reset_connection ();	1422	reset_connection ();
1273	}	1423	}
1274		1424
1275	connection::~connection ()	1425	connection::~connection ()
1276	{	1426	{

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Comparing gvpe/src/connection.C (file contents): Revision 1.61 by pcg, Sat Nov 10 19:43:37 2007 UTC vs. Revision 1.82 by pcg, Fri Aug 15 18:35:24 2008 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.61 by pcg, Sat Nov 10 19:43:37 2007 UTC vs.
Revision 1.82 by pcg, Fri Aug 15 18:35:24 2008 UTC