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

Comparing gvpe/src/connection.C (file contents):
Revision 1.39 by pcg, Tue Oct 12 12:06:06 2004 UTC vs.
Revision 1.96 by root, Thu Mar 24 21:52:48 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"
52		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	//////////////////////////////////////////////////////////////////////////////
		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;
57		112
…		…
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	132	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
78	{	133	{
79	EVP_MD_CTX ctx;	134	EVP_MD_CTX ctx;
80		135
81	EVP_MD_CTX_init (&ctx);	136	EVP_MD_CTX_init (&ctx);
82	require (EVP_DigestInit (&ctx, RSA_HASH));	137	require (EVP_DigestInit (&ctx, RSA_HASH));
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));	138	require (EVP_DigestUpdate (&ctx, &chg, sizeof chg));
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;
789		929
790	si.host = 0;	930	si.host = 0;
791		931
792	last_activity = 0;	932	last_activity = 0.;
		933	//last_si_change = 0.;
793	retry_cnt = 0;	934	retry_cnt = 0;
794		935
795	rekey.stop ();	936	rekey.stop ();
796	keepalive.stop ();	937	keepalive.stop ();
797	establish_connection.stop ();	938	establish_connection.stop ();
…		…
804	send_reset (si);	945	send_reset (si);
805		946
806	reset_connection ();	947	reset_connection ();
807	}	948	}
808		949
809	void	950	// poor-man's rekeying
810	connection::rekey_cb (time_watcher &w)	951	inline void
		952	connection::rekey_cb (ev::timer &w, int revents)
811	{	953	{
812	reset_connection ();	954	reset_connection ();
813	establish_connection ();	955	establish_connection ();
814	}	956	}
815		957
…		…
831	if (oseqno > MAX_SEQNO)	973	if (oseqno > MAX_SEQNO)
832	rekey ();	974	rekey ();
833	}	975	}
834		976
835	void	977	void
		978	connection::post_inject_queue ()
		979	{
		980	// force a connection every now and when when packets are sent (max 1/s)
		981	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		982	establish_connection.stop ();
		983
		984	establish_connection ();
		985	}
		986
		987	void
836	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	988	connection::inject_data_packet (tap_packet *pkt)
837	{	989	{
838	if (ictx && octx)	990	if (ictx && octx)
839	send_data_packet (pkt);	991	send_data_packet (pkt);
840	else	992	else
841	{	993	{
842	if (!broadcast)//DDDD
843	data_queue.put (new tap_packet (*pkt));	994	data_queue.put (new tap_packet (*pkt));
844		995	post_inject_queue ();
845	establish_connection ();
846	}	996	}
847	}	997	}
848		998
		999	void
849	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1000	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
850	{	1001	{
851	if (ictx && octx)	1002	if (ictx && octx)
852	send_vpn_packet (pkt, si, tos);	1003	send_vpn_packet (pkt, si, tos);
853	else	1004	else
854	{	1005	{
855	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1006	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
856		1007	post_inject_queue ();
857	establish_connection ();
858	}	1008	}
859	}	1009	}
860		1010
861	void	1011	void
862	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1012	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
863	{	1013	{
864	last_activity = NOW;	1014	last_activity = ev_now ();
865		1015
866	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1016	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
867	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1017	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1018
		1019	if (connectmode == conf_node::C_DISABLED)
		1020	return;
868		1021
869	switch (pkt->typ ())	1022	switch (pkt->typ ())
870	{	1023	{
871	case vpn_packet::PT_PING:	1024	case vpn_packet::PT_PING:
		1025	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1026
872	// we send pings instead of auth packets after some retries,	1027	// we send pings instead of auth packets after some retries,
873	// so reset the retry counter and establish a connection	1028	// so reset the retry counter and establish a connection
874	// when we receive a ping.	1029	// when we receive a ping.
875	if (!ictx)	1030	if (!ictx)
876	{	1031	{
877	if (auth_rate_limiter.can (rsi))	1032	if (auth_rate_limiter.can (rsi))
878	send_auth_request (rsi, true);	1033	send_auth_request (rsi, true);
879	}	1034	}
880	else	1035	else
		1036	// we would love to change the socket address here, but ping's aren't
		1037	// authenticated, so we best ignore it.
881	send_ping (rsi, 1); // pong	1038	send_ping (rsi, 1); // pong
882		1039
883	break;	1040	break;
884		1041
885	case vpn_packet::PT_PONG:	1042	case vpn_packet::PT_PONG:
		1043	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1044
		1045	// a PONG might mean that the other side doesn't really know
		1046	// about our desire for communication.
		1047	establish_connection ();
886	break;	1048	break;
887		1049
888	case vpn_packet::PT_RESET:	1050	case vpn_packet::PT_RESET:
889	{	1051	{
890	reset_connection ();	1052	reset_connection ();
891		1053
892	config_packet p = (config_packet ) pkt;	1054	config_packet p = (config_packet ) pkt;
893		1055
894	if (!p->chk_config ())	1056	if (!p->chk_config ())
895	{	1057	{
896	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1058	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
897	conf->nodename, (const char *)rsi);	1059	conf->nodename, (const char *)rsi);
898	connectmode = conf_node::C_DISABLED;	1060	connectmode = conf_node::C_DISABLED;
899	}	1061	}
900	else if (connectmode == conf_node::C_ALWAYS)	1062	else if (connectmode == conf_node::C_ALWAYS)
901	establish_connection ();	1063	establish_connection ();
…		…
903	break;	1065	break;
904		1066
905	case vpn_packet::PT_AUTH_REQ:	1067	case vpn_packet::PT_AUTH_REQ:
906	if (auth_rate_limiter.can (rsi))	1068	if (auth_rate_limiter.can (rsi))
907	{	1069	{
908	auth_req_packet p = (auth_req_packet ) pkt;	1070	auth_req_packet p = (auth_req_packet )pkt;
909		1071
910	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1072	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1073	conf->nodename, p->initiate ? "initiate" : "reply",
		1074	p->protocols, p->features);
911		1075
912	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1076	if (p->chk_config ()
		1077	&& (!memcmp (p->magic, MAGIC_OLD, 8) \|\| !memcmp (p->magic, MAGIC, 8)))
913	{	1078	{
914	if (p->prot_minor != PROTOCOL_MINOR)	1079	if (p->prot_minor != PROTOCOL_MINOR)
915	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."),
916	conf->nodename, (const char *)rsi,	1081	conf->nodename, (const char *)rsi,
917	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1082	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
932	delete octx;	1097	delete octx;
933		1098
934	octx = new crypto_ctx (k, 1);	1099	octx = new crypto_ctx (k, 1);
935	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1100	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
936		1101
937	// compatibility code, remove when no longer required
938	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
939
940	conf->protocols = p->protocols;	1102	conf->protocols = p->protocols;
941	features = p->features & config_packet::get_features ();	1103	features = p->features & config_packet::get_features ();
942		1104
943	send_auth_response (rsi, p->id, k);	1105	send_auth_response (rsi, p->id, k);
944		1106
…		…
946		1108
947	break;	1109	break;
948	}	1110	}
949	}	1111	}
950	else	1112	else
951	slog (L_WARN, _("%s(%s): protocol mismatch"),	1113	slog (L_WARN, _("%s(%s): protocol mismatch."),
952	conf->nodename, (const char *)rsi);	1114	conf->nodename, (const char *)rsi);
953		1115
954	send_reset (rsi);	1116	send_reset (rsi);
955	}	1117	}
956		1118
957	break;	1119	break;
958		1120
959	case vpn_packet::PT_AUTH_RES:	1121	case vpn_packet::PT_AUTH_RES:
960	{	1122	{
961	auth_res_packet p = (auth_res_packet ) pkt;	1123	auth_res_packet p = (auth_res_packet )pkt;
962		1124
963	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1125	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
964		1126
965	if (p->chk_config ())	1127	if (p->chk_config ())
966	{	1128	{
967	if (p->prot_minor != PROTOCOL_MINOR)	1129	if (p->prot_minor != PROTOCOL_MINOR)
968	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."),
…		…
971		1133
972	rsachallenge chg;	1134	rsachallenge chg;
973		1135
974	if (!rsa_cache.find (p->id, chg))	1136	if (!rsa_cache.find (p->id, chg))
975	{	1137	{
976	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1138	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
977	conf->nodename, (const char *)rsi);	1139	conf->nodename, (const char *)rsi);
978	break;	1140	break;
979	}	1141	}
980	else	1142	else
981	{	1143	{
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1144	crypto_ctx *cctx = new crypto_ctx (chg, 0);
983		1145
984	if (!p->hmac_chk (cctx))	1146	if (!p->hmac_chk (cctx))
985	{	1147	{
986	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"
987	"could be an attack, or just corruption or a synchronization error"),	1149	"could be an attack, or just corruption or a synchronization error."),
988	conf->nodename, (const char *)rsi);	1150	conf->nodename, (const char *)rsi);
989	break;	1151	break;
990	}	1152	}
991	else	1153	else
992	{	1154	{
…		…
1003	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
1004		1166
1005	si = rsi;	1167	si = rsi;
1006	protocol = rsi.prot;	1168	protocol = rsi.prot;
1007		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
1008	connection_established ();	1175	connection_established ();
1009		1176
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)	1177	if (::conf.script_node_up)
1015	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	}
1016		1183
1017	break;	1184	break;
1018	}	1185	}
1019	else	1186	else
1020	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."),
1021	conf->nodename, (const char *)rsi);	1188	conf->nodename, (const char *)rsi);
1022	}	1189	}
1023		1190
1024	delete cctx;	1191	delete cctx;
1025	}	1192	}
…		…
1041	{	1208	{
1042	vpndata_packet p = (vpndata_packet )pkt;	1209	vpndata_packet p = (vpndata_packet )pkt;
1043		1210
1044	if (!p->hmac_chk (ictx))	1211	if (!p->hmac_chk (ictx))
1045	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"
1046	"could be an attack, or just corruption or a synchronization error"),	1213	"could be an attack, or just corruption or a synchronization error."),
1047	conf->nodename, (const char *)rsi);	1214	conf->nodename, (const char *)rsi);
1048	else	1215	else
1049	{	1216	{
1050	u32 seqno;	1217	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1218	tap_packet *d = p->unpack (this, seqno);
		1219	int seqclass = iseqno.seqno_classify (seqno);
1052		1220
1053	if (iseqno.recv_ok (seqno))	1221	if (seqclass == 0) // ok
1054	{	1222	{
1055	vpn->tap->send (d);	1223	vpn->tap->send (d);
1056		1224
1057	if (si != rsi)	1225	if (si != rsi)
1058	{	1226	{
1059	// 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.)
1060	si = rsi;	1229	// {
1061
1062	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1230	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1063	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);
1064	}	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);
1065	}	1259	}
1066		1260
1067	delete d;	1261	delete d;
1068	break;	1262	break;
1069	}	1263	}
…		…
1073	break;	1267	break;
1074		1268
1075	case vpn_packet::PT_CONNECT_REQ:	1269	case vpn_packet::PT_CONNECT_REQ:
1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1270	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1077	{	1271	{
1078	connect_req_packet p = (connect_req_packet ) pkt;	1272	connect_req_packet p = (connect_req_packet )pkt;
1079		1273
1080	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 ())
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	{	1275	{
		1276	connection *c = vpn->conns[p->id - 1];
		1277	conf->protocols = p->protocols;
		1278
		1279	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1280	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1281	p->protocols,
		1282	c->ictx && c->octx);
		1283
		1284	if (c->ictx && c->octx)
		1285	{
1089	// send connect_info packets to both sides, in case one is	1286	// send connect_info packets to both sides, in case one is
1090	// behind a nat firewall (or both ;)	1287	// behind a nat firewall (or both ;)
1091	c->send_connect_info (conf->id, si, conf->protocols);	1288	c->send_connect_info (conf->id, si, conf->protocols);
1092	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1289	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1290	}
		1291	else
		1292	c->establish_connection ();
1093	}	1293	}
1094	else	1294	else
1095	c->establish_connection ();	1295	slog (L_WARN,
		1296	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1297	p->id);
1096	}	1298	}
1097		1299
1098	break;	1300	break;
1099		1301
1100	case vpn_packet::PT_CONNECT_INFO:	1302	case vpn_packet::PT_CONNECT_INFO:
1101	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1303	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1102	{	1304	{
1103	connect_info_packet p = (connect_info_packet )pkt;	1305	connect_info_packet p = (connect_info_packet )pkt;
1104		1306
1105	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1307	if (p->id > 0 && p->id <= vpn->conns.size ())
1106	{	1308	{
1107	connection *c = vpn->conns[p->id - 1];	1309	connection *c = vpn->conns[p->id - 1];
1108		1310
1109	c->conf->protocols = p->protocols;	1311	c->conf->protocols = p->protocols;
1110	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1312	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1111	p->si.upgrade_protocol (protocol, c->conf);	1313	p->si.upgrade_protocol (protocol, c->conf);
1112		1314
1113	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1315	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1114	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1316	conf->nodename,
		1317	vpn->conns[p->id - 1]->conf->nodename,
		1318	(const char *)p->si,
		1319	p->protocols,
		1320	protocol,
		1321	p->si.supported_protocols (c->conf),
		1322	!c->ictx && !c->octx);
1115		1323
1116	const sockinfo &dsi = forward_si (p->si);	1324	const sockinfo &dsi = forward_si (p->si);
1117		1325
1118	if (dsi.valid ())	1326	if (dsi.valid ())
1119	c->send_auth_request (dsi, true);	1327	c->send_auth_request (dsi, true);
		1328	else
		1329	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1330	vpn->conns[p->id - 1]->conf->nodename,
		1331	(const char *)p->si);
1120	}	1332	}
		1333	else
		1334	slog (L_WARN,
		1335	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1336	p->id);
1121	}	1337	}
1122		1338
1123	break;	1339	break;
1124		1340
1125	default:	1341	default:
1126	send_reset (rsi);	1342	send_reset (rsi);
1127	break;	1343	break;
1128	}	1344	}
1129	}	1345	}
1130		1346
1131	void connection::keepalive_cb (time_watcher &w)	1347	inline void
		1348	connection::keepalive_cb (ev::timer &w, int revents)
1132	{	1349	{
1133	if (NOW >= last_activity + ::conf.keepalive + 30)	1350	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1134	{	1351	{
1135	reset_connection ();	1352	reset_connection ();
1136	establish_connection ();	1353	establish_connection ();
1137	}	1354	}
1138	else if (NOW < last_activity + ::conf.keepalive)	1355	else if (ev_now () < last_activity + ::conf.keepalive)
1139	w.start (last_activity + ::conf.keepalive);	1356	w.start (last_activity + ::conf.keepalive - ev::now ());
1140	else if (conf->connectmode != conf_node::C_ONDEMAND	1357	else if (conf->connectmode != conf_node::C_ONDEMAND
1141	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1358	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1142	{	1359	{
1143	send_ping (si);	1360	send_ping (si);
1144	w.start (NOW + 5);	1361	w.start (3);
1145	}	1362	}
1146	else if (NOW < last_activity + ::conf.keepalive + 10)	1363	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1147	// hold ondemand connections implicitly a few seconds longer	1364	// hold ondemand connections implicitly a few seconds longer
1148	// should delete octx, though, or something like that ;)	1365	// should delete octx, though, or something like that ;)
1149	w.start (last_activity + ::conf.keepalive + 10);	1366	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1150	else	1367	else
1151	reset_connection ();	1368	reset_connection ();
1152	}	1369	}
1153		1370
		1371	void
1154	void connection::send_connect_request (int id)	1372	connection::send_connect_request (int id)
1155	{	1373	{
1156	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1374	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1157		1375
1158	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1376	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1377	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1378	THISNODE->protocols);
1159	p->hmac_set (octx);	1379	p->hmac_set (octx);
1160	send_vpn_packet (p, si);	1380	send_vpn_packet (p, si);
1161		1381
1162	delete p;	1382	delete p;
1163	}	1383	}
1164		1384
1165	void connection::script_node ()	1385	void
		1386	connection::script_init_env (const char *ext)
1166	{	1387	{
1167	vpn->script_if_up ();
1168
1169	char *env;	1388	char *env;
		1389	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1390	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1391	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1392	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1393	conf->id & 0xff); putenv (env);
		1394	}
		1395
		1396	void
		1397	connection::script_init_connect_env ()
		1398	{
		1399	vpn->script_init_env ();
		1400
		1401	char *env;
1170	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1402	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1403	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1171	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1404	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1172	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1405	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1173	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1406	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1174	}	1407	}
1175		1408
		1409	inline const char *
1176	const char *connection::script_node_up ()	1410	connection::script_node_up ()
1177	{	1411	{
1178	script_node ();	1412	script_init_connect_env ();
1179		1413
1180	putenv ("STATE=up");	1414	putenv ((char *)"STATE=up");
1181		1415
		1416	char *filename;
		1417	asprintf (&filename,
		1418	"%s/%s",
		1419	confbase,
1182	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1420	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1183	}
1184		1421
		1422	return filename;
		1423	}
		1424
		1425	inline const char *
		1426	connection::script_node_change ()
		1427	{
		1428	script_init_connect_env ();
		1429
		1430	putenv ((char *)"STATE=change");
		1431
		1432	char *filename;
		1433	asprintf (&filename,
		1434	"%s/%s",
		1435	confbase,
		1436	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1437
		1438	return filename;
		1439	}
		1440
		1441	inline const char *
1185	const char *connection::script_node_down ()	1442	connection::script_node_down ()
1186	{	1443	{
1187	script_node ();	1444	script_init_connect_env ();
1188		1445
1189	putenv ("STATE=down");	1446	putenv ((char *)"STATE=down");
1190		1447
1191	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1448	char *filename;
1192	}	1449	asprintf (&filename,
		1450	"%s/%s",
		1451	confbase,
		1452	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1193		1453
		1454	return filename;
		1455	}
		1456
1194	connection::connection(struct vpn *vpn_)	1457	connection::connection (struct vpn vpn, conf_node conf)
1195	: vpn(vpn_)	1458	: vpn(vpn), conf(conf),
1196	, rekey (this, &connection::rekey_cb)	1459	#if ENABLE_DNS
1197	, keepalive (this, &connection::keepalive_cb)	1460	dns (0),
		1461	#endif
		1462	data_queue(conf->max_ttl, conf->max_queue + 1),
		1463	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1464	{
		1465	rekey .set<connection, &connection::rekey_cb > (this);
		1466	keepalive .set<connection, &connection::keepalive_cb > (this);
1198	, establish_connection (this, &connection::establish_connection_cb)	1467	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1199	{	1468
		1469	last_establish_attempt = 0.;
1200	octx = ictx = 0;	1470	octx = ictx = 0;
1201	retry_cnt = 0;
1202		1471
1203	connectmode = conf_node::C_ALWAYS; // initial setting	1472	connectmode = conf->connectmode;
		1473
		1474	// queue a dummy packet to force an initial connection attempt
		1475	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1476	vpn_queue.put (new net_packet);
		1477
1204	reset_connection ();	1478	reset_connection ();
1205	}	1479	}
1206		1480
1207	connection::~connection ()	1481	connection::~connection ()
1208	{	1482	{
1209	shutdown ();	1483	shutdown ();
1210	}	1484	}
1211		1485
		1486	void
1212	void connection_init ()	1487	connection_init ()
1213	{	1488	{
1214	auth_rate_limiter.clear ();	1489	auth_rate_limiter.clear ();
1215	reset_rate_limiter.clear ();	1490	reset_rate_limiter.clear ();
1216	}	1491	}
1217		1492

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Comparing gvpe/src/connection.C (file contents): Revision 1.39 by pcg, Tue Oct 12 12:06:06 2004 UTC vs. Revision 1.96 by root, Thu Mar 24 21:52:48 2011 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.39 by pcg, Tue Oct 12 12:06:06 2004 UTC vs.
Revision 1.96 by root, Thu Mar 24 21:52:48 2011 UTC