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

Comparing gvpe/src/connection.C (file contents):
Revision 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.98 by root, Tue Jul 16 16:44:36 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#include <sys/socket.h>	50	#include "netcompat.h"
41	#ifdef HAVE_NETINET_IN_H
42	# include <netinet/in.h>
43	#endif
44	#include <arpa/inet.h>
45	#include <net/if.h>
46	#ifdef HAVE_NETINET_IN_SYSTM_H
47	# include <netinet/in_systm.h>
48	#endif
49	#ifdef HAVE_NETINET_IP_H
50	# include <netinet/ip.h>
51	#endif
52		51
53	#ifndef IPTOS_TOS_MASK
54	# define IPTOS_TOS_MASK (IPTOS_LOWDELAY \| IPTOS_THROUGHPUT \| IPTOS_RELIABILITY \| IPTOS_MINCOST)
55	#endif
56
57	#if !HAVE_RAND_PSEUDO_BYTES
58	# define RAND_pseudo_bytes RAND_bytes
59	#endif
60
61	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53
		54	#define ULTRA_FAST 1
		55	#define HLOG 15
		56	#include "lzf/lzf.h"
		57	#include "lzf/lzf_c.c"
		58	#include "lzf/lzf_d.c"
		59
		60	//////////////////////////////////////////////////////////////////////////////
		61
		62	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		63	static ev::child rs_child_ev;
		64
		65	namespace
		66	{
		67	void // c++ requires external linkage here, apparently :(
		68	rs_child_cb (ev::child &w, int revents)
		69	{
		70	w.stop ();
		71
		72	if (rs_queue.empty ())
		73	return;
		74
		75	pid_t pid = run_script (*rs_queue.front ().first, false);
		76	if (pid)
		77	{
		78	w.set (pid);
		79	w.start ();
		80	}
		81	else
		82	slog (L_WARN, rs_queue.front ().second);
		83
		84	delete rs_queue.front ().first;
		85	rs_queue.pop ();
		86	}
		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	//////////////////////////////////////////////////////////////////////////////
62		103
63	struct crypto_ctx	104	struct crypto_ctx
64	{	105	{
65	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
66	HMAC_CTX hctx;	107	HMAC_CTX hctx;
67		108
68	crypto_ctx (const rsachallenge &challenge, int enc);	109	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
69	~crypto_ctx ();	110	~crypto_ctx ();
70	};	111	};
71		112
72	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	113	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
73	{	114	{
		115	ecdh_key s;
		116
		117	curve25519_combine (a, b, s);
		118
		119	{
		120	u8 mac_key[MAC_KEYSIZE];
		121	static const unsigned char mac_info[] = "gvpe mac key";
		122
		123	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt));
		124	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done ();
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt));
		139	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done ();
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
74	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
75	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
76	HMAC_CTX_init (&hctx);	147	}
77	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
78	}	148	}
79		149
80	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
81	{	151	{
82	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
83	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
84	}	154	}
85		155
		156	static inline void
		157	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		158	{
		159	if (RSA_public_encrypt (sizeof (auth.rsa),
		160	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		161	key, RSA_PKCS1_OAEP_PADDING) < 0)
		162	fatal ("RSA_public_encrypt error");
		163	}
		164
		165	static inline bool
		166	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		167	{
		168	u8 rsa_decrypt[RSA_KEYLEN];
		169
		170	if (RSA_private_decrypt (sizeof (encr.rsa),
		171	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		172	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		173	return 0;
		174
		175	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		176
		177	return 1;
		178	}
		179
86	static void	180	static void
87	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	181	auth_hash (const auth_data &auth, auth_mac &mac)
88	{	182	{
89	EVP_MD_CTX ctx;	183	HMAC_CTX ctx;
90		184
91	EVP_MD_CTX_init (&ctx);	185	HMAC_CTX_init (&ctx);
92	EVP_DigestInit (&ctx, RSA_HASH);	186	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
93	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	187	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
94	EVP_DigestUpdate(&ctx, &id, sizeof id);	188	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
95	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
96	EVP_MD_CTX_cleanup (&ctx);	189	HMAC_CTX_cleanup (&ctx);
97	}	190	}
98		191
99	struct rsa_entry {	192	void
100	tstamp expire;	193	connection::generate_auth_data ()
101	rsaid id;
102	rsachallenge chg;
103	};
104
105	struct rsa_cache : list<rsa_entry>
106	{	194	{
107	void cleaner_cb (time_watcher &w); time_watcher cleaner;	195	if (auth_expire < ev_now ())
108
109	bool find (const rsaid &id, rsachallenge &chg)
110	{
111	for (iterator i = begin (); i != end (); ++i)
112	{
113	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
114	{
115	memcpy (&chg, &i->chg, sizeof chg);
116
117	erase (i);
118	return true;
119	}
120	}
121
122	if (cleaner.at < NOW)
123	cleaner.start (NOW + RSA_TTL);
124
125	return false;
126	}
127
128	void gen (rsaid &id, rsachallenge &chg)
129	{
130	rsa_entry e;
131
132	RAND_bytes ((unsigned char *)&id, sizeof id);
133	RAND_bytes ((unsigned char *)&chg, sizeof chg);
134
135	e.expire = NOW + RSA_TTL;
136	e.id = id;
137	memcpy (&e.chg, &chg, sizeof chg);
138
139	push_back (e);
140
141	if (cleaner.at < NOW)
142	cleaner.start (NOW + RSA_TTL);
143	}
144
145	rsa_cache ()
146	: cleaner (this, &rsa_cache::cleaner_cb)
147	{ }	196	{
		197	// request data
		198	RAND_pseudo_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		199	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		200	auth_hash (snd_auth, snd_auth_mac);
148		201
149	} rsa_cache;	202	// eventual response data
150		203	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
151	void rsa_cache::cleaner_cb (time_watcher &w)
152	{
153	if (empty ())
154	w.at = TSTAMP_CANCEL;
155	else
156	{	204	}
157	w.at = NOW + RSA_TTL;
158		205
159	for (iterator i = begin (); i != end (); )	206	// every use prolongs the expiry
160	if (i->expire <= NOW)	207	auth_expire = ev_now () + AUTH_TTL;
161	i = erase (i);
162	else
163	++i;
164	}
165	}	208	}
166		209
167	//////////////////////////////////////////////////////////////////////////////	210	//////////////////////////////////////////////////////////////////////////////
168		211
169	void pkt_queue::put (net_packet *p)	212	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		213	: max_ttl (max_ttl), max_queue (max_queue)
170	{	214	{
171	if (queue[i])	215	queue = new pkt [max_queue];
172	{
173	delete queue[i];
174	j = (j + 1) % QUEUEDEPTH;
175	}
176		216
177	queue[i] = p;
178
179	i = (i + 1) % QUEUEDEPTH;
180	}
181
182	net_packet *pkt_queue::get ()
183	{
184	net_packet *p = queue[j];
185
186	if (p)
187	{
188	queue[j] = 0;
189	j = (j + 1) % QUEUEDEPTH;
190	}
191
192	return p;
193	}
194
195	pkt_queue::pkt_queue ()
196	{
197	memset (queue, 0, sizeof (queue));
198	i = 0;	217	i = 0;
199	j = 0;	218	j = 0;
		219
		220	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
200	}	221	}
201		222
202	pkt_queue::~pkt_queue ()	223	pkt_queue::~pkt_queue ()
203	{	224	{
204	for (i = QUEUEDEPTH; --i > 0; )	225	while (net_packet *p = get ())
		226	delete p;
		227
205	delete queue[i];	228	delete [] queue;
206	}	229	}
207		230
		231	void
		232	pkt_queue::expire_cb (ev::timer &w, int revents)
		233	{
		234	ev_tstamp expire = ev_now () - max_ttl;
		235
		236	for (;;)
		237	{
		238	if (empty ())
		239	break;
		240
		241	double diff = queue[j].tstamp - expire;
		242
		243	if (diff >= 0.)
		244	{
		245	w.start (diff > 0.5 ? diff : 0.5);
		246	break;
		247	}
		248
		249	delete get ();
		250	}
		251	}
		252
		253	void
		254	pkt_queue::put (net_packet *p)
		255	{
		256	ev_tstamp now = ev_now ();
		257
		258	// start expiry timer
		259	if (empty ())
		260	expire.start (max_ttl);
		261
		262	int ni = i + 1 == max_queue ? 0 : i + 1;
		263
		264	if (ni == j)
		265	delete get ();
		266
		267	queue[i].pkt = p;
		268	queue[i].tstamp = now;
		269
		270	i = ni;
		271	}
		272
		273	net_packet *
		274	pkt_queue::get ()
		275	{
		276	if (empty ())
		277	return 0;
		278
		279	net_packet *p = queue[j].pkt;
		280	queue[j].pkt = 0;
		281
		282	j = j + 1 == max_queue ? 0 : j + 1;
		283
		284	return p;
		285	}
		286
208	struct net_rateinfo {	287	struct net_rateinfo
		288	{
209	u32 host;	289	u32 host;
210	double pcnt, diff;	290	double pcnt, diff;
211	tstamp last;	291	tstamp last;
212	};	292	};
213		293
214	// only do action once every x seconds per host whole allowing bursts.	294	// only do action once every x seconds per host whole allowing bursts.
215	// this implementation ("splay list" ;) is inefficient,	295	// this implementation ("splay list" ;) is inefficient,
216	// but low on resources.	296	// but low on resources.
217	struct net_rate_limiter : list<net_rateinfo>	297	struct net_rate_limiter : list<net_rateinfo>
218	{	298	{
219	static const double ALPHA = 1. - 1. / 600.; // allow bursts	299	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
220	static const double CUTOFF = 10.; // one event every CUTOFF seconds	300	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
221	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	301	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
222	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	302	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
223		303
224	bool can (const sockinfo &si) { return can((u32)si.host); }	304	bool can (const sockinfo &si) { return can((u32)si.host); }
225	bool can (u32 host);	305	bool can (u32 host);
226	};	306	};
227		307
228	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	308	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
229		309
		310	bool
230	bool net_rate_limiter::can (u32 host)	311	net_rate_limiter::can (u32 host)
231	{	312	{
232	iterator i;	313	iterator i;
233		314
234	for (i = begin (); i != end (); )	315	for (i = begin (); i != end (); )
235	if (i->host == host)	316	if (i->host == host)
236	break;	317	break;
237	else if (i->last < NOW - EXPIRE)	318	else if (i->last < ev_now () - NRL_EXPIRE)
238	i = erase (i);	319	i = erase (i);
239	else	320	else
240	i++;	321	i++;
241		322
242	if (i == end ())	323	if (i == end ())
243	{	324	{
244	net_rateinfo ri;	325	net_rateinfo ri;
245		326
246	ri.host = host;	327	ri.host = host;
247	ri.pcnt = 1.;	328	ri.pcnt = 1.;
248	ri.diff = MAXDIF;	329	ri.diff = NRL_MAXDIF;
249	ri.last = NOW;	330	ri.last = ev_now ();
250		331
251	push_front (ri);	332	push_front (ri);
252		333
253	return true;	334	return true;
254	}	335	}
255	else	336	else
256	{	337	{
257	net_rateinfo ri (*i);	338	net_rateinfo ri (*i);
258	erase (i);	339	erase (i);
259		340
260	ri.pcnt = ri.pcnt * ALPHA;	341	ri.pcnt = ri.pcnt * NRL_ALPHA;
261	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	342	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
262		343
263	ri.last = NOW;	344	ri.last = ev_now ();
264		345
265	double dif = ri.diff / ri.pcnt;	346	double dif = ri.diff / ri.pcnt;
266		347
267	bool send = dif > CUTOFF;	348	bool send = dif > NRL_CUTOFF;
268		349
269	if (dif > MAXDIF)	350	if (dif > NRL_MAXDIF)
270	{	351	{
271	ri.pcnt = 1.;	352	ri.pcnt = 1.;
272	ri.diff = MAXDIF;	353	ri.diff = NRL_MAXDIF;
273	}	354	}
274	else if (send)	355	else if (send)
275	ri.pcnt++;	356	ri.pcnt++;
276		357
277	push_front (ri);	358	push_front (ri);
282		363
283	/////////////////////////////////////////////////////////////////////////////	364	/////////////////////////////////////////////////////////////////////////////
284		365
285	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	366	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
286		367
		368	void
287	void hmac_packet::hmac_gen (crypto_ctx *ctx)	369	hmac_packet::hmac_gen (crypto_ctx *ctx)
288	{	370	{
289	unsigned int xlen;	371	unsigned int xlen;
290		372
291	HMAC_CTX *hctx = &ctx->hctx;	373	HMAC_CTX *hctx = &ctx->hctx;
292		374
293	HMAC_Init_ex (hctx, 0, 0, 0, 0);	375	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
294	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	376	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
295	len - sizeof (hmac_packet));	377	len - sizeof (hmac_packet)));
296	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	378	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
297	}	379	}
298		380
299	void	381	void
300	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
301	{	383	{
…		…
310	hmac_gen (ctx);	392	hmac_gen (ctx);
311		393
312	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return !memcmp (hmac, hmac_digest, HMACLENGTH);
313	}	395	}
314		396
		397	void
315	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
316	{	399	{
317	type = type_;	400	type = type_;
318		401
319	int src = THISNODE->id;	402	int src = THISNODE->id;
320		403
…		…
324	}	407	}
325		408
326	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
327	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
328		411
329	struct vpndata_packet:vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		417	tap_packet unpack (connection conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
330	{	421	{
331	u8 data[MAXVPNDATA + DATAHDR]; // seqno
332
333	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
334	tap_packet unpack (connection conn, u32 &seqno);
335	private:
336
337	const u32 data_hdr_size () const
338	{
339	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
340	}
341	};	423	}
		424	};
342		425
343	void	426	void
344	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
345	{	428	{
346	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
347	int outl = 0, outl2;	430	int outl = 0, outl2;
348	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
349		432
350	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
351	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
352	u32 cl;
353		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
354	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
355	if (cl)	440	if (cl)
356	{	441	{
357	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
358	d = cdata;	443	d = cdata;
359	l = cl + 2;	444	l = cl + 2;
360		445
361	d[0] = cl >> 8;	446	d[0] = cl >> 8;
362	d[1] = cl;	447	d[1] = cl;
		448	}
363	}	449	}
364	#endif	450	#endif
365		451
366	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
367		453
368	struct {	454	struct {
369	#if RAND_SIZE	455	#if RAND_SIZE
370	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
371	#endif	457	#endif
…		…
375	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
376	#if RAND_SIZE	462	#if RAND_SIZE
377	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
378	#endif	464	#endif
379		465
380	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
381	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
382	(unsigned char *) &datahdr, DATAHDR);	468	(unsigned char *) &datahdr, DATAHDR));
383	outl += outl2;	469	outl += outl2;
384		470
385	EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
386	(unsigned char *) data + outl, &outl2,	472	(unsigned char *) data + outl, &outl2,
387	(unsigned char *) d, l);	473	(unsigned char *) d, l));
388	outl += outl2;	474	outl += outl2;
389		475
390	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	476	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
391	outl += outl2;	477	outl += outl2;
392		478
393	len = outl + data_hdr_size ();	479	len = outl + data_hdr_size ();
394		480
395	set_hdr (type, dst);	481	set_hdr (type, dst);
…		…
404	int outl = 0, outl2;	490	int outl = 0, outl2;
405	tap_packet *p = new tap_packet;	491	tap_packet *p = new tap_packet;
406	u8 *d;	492	u8 *d;
407	u32 l = len - data_hdr_size ();	493	u32 l = len - data_hdr_size ();
408		494
409	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	495	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
410		496
411	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
412	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
413		499
414	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
…		…
416	else	502	else
417	#endif	503	#endif
418	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6 - DATAHDR];
419		505
420	/* this overwrites part of the src mac, but we fix that later */	506	/* this overwrites part of the src mac, but we fix that later */
421	EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
422	d, &outl2,	508	d, &outl2,
423	(unsigned char *)&data, len - data_hdr_size ());	509	(unsigned char *)&data, len - data_hdr_size ()));
424	outl += outl2;	510	outl += outl2;
425		511
426	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	512	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
427	outl += outl2;	513	outl += outl2;
428		514
429	seqno = ntohl ((u32 )(d + RAND_SIZE));	515	seqno = ntohl ((u32 )(d + RAND_SIZE));
430		516
431	id2mac (dst () ? dst() : THISNODE->id, p->dst);	517	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
456	}	542	}
457	};	543	};
458		544
459	struct config_packet : vpn_packet	545	struct config_packet : vpn_packet
460	{	546	{
461	// actually, hmaclen cannot be checked because the hmac
462	// field comes before this data, so peers with other
463	// hmacs simply will not work.
464	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
465	u8 flags, challengelen, pad2, pad3;	548	u8 flags, features, pad6, pad7, pad8;
466	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
467
468	const u8 curflags () const
469	{
470	return 0x80
471	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
472	}
473		550
474	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
475	bool chk_config () const;	552	bool chk_config () const;
		553
		554	static u8 get_features ()
		555	{
		556	u8 f = 0;
		557	#if ENABLE_COMPRESSION
		558	f \|= FEATURE_COMPRESSION;
		559	#endif
		560	#if ENABLE_ROHC
		561	f \|= FEATURE_ROHC;
		562	#endif
		563	#if ENABLE_BRIDGING
		564	f \|= FEATURE_BRIDGING;
		565	#endif
		566	return f;
		567	}
476	};	568	};
477		569
		570	void
478	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
479	{	572	{
480	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;	575	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;	576	flags = 0;
484	flags = curflags ();	577	features = get_features ();
485	challengelen = sizeof (rsachallenge);
486		578
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	579	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	hmac_nid = htonl (EVP_MD_type (DIGEST));	580	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		581	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
490		582
491	len = sizeof (*this) - sizeof (net_packet);	583	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	584	set_hdr (type, dst);
493	}	585	}
494		586
		587	bool
495	bool config_packet::chk_config () const	588	config_packet::chk_config () const
496	{	589	{
497	if (prot_major != PROTOCOL_MAJOR)	590	if (prot_major != PROTOCOL_MAJOR)
498	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	591	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
499	else if (randsize != RAND_SIZE)	592	else if (randsize != RAND_SIZE)
500	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	593	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501	else if (hmaclen != HMACLENGTH)
502	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
503	else if (flags != curflags ())
504	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	595	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
510	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	596	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	597	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		598	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		599	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	600	else
514	return true;	601	return true;
515		602
516	return false;	603	return false;
517	}	604	}
518		605
519	struct auth_req_packet : config_packet	606	struct auth_req_packet : config_packet // UNPROTECTED
520	{	607	{
521	char magic[8];	608	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	609	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will get patches on forward)	610	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	611	u8 pad2, pad3;
525	rsaid id;	612	auth_encr encr;
526	rsaencrdata encr;
527		613
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	614	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	615	{
530	config_packet::setup (PT_AUTH_REQ, dst);	616	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	617	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	618	initiate = !!initiate_;
533	protocols = protocols_;	619	protocols = protocols_;
534		620
535	len = sizeof (*this) - sizeof (net_packet);	621	len = sizeof (*this) - sizeof (net_packet);
536	}	622	}
537	};	623	};
538		624
539	struct auth_res_packet : config_packet	625	struct auth_res_packet : config_packet // UNPROTECTED
540	{	626	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	627	auth_response response;
545		628
546	auth_res_packet (int dst)	629	auth_res_packet (int dst)
547	{	630	{
548	config_packet::setup (PT_AUTH_RES, dst);	631	config_packet::setup (PT_AUTH_RES, dst);
549		632
…		…
583	};	666	};
584		667
585	/////////////////////////////////////////////////////////////////////////////	668	/////////////////////////////////////////////////////////////////////////////
586		669
587	void	670	void
588	connection::connection_established ()	671	connection::connection_established (const sockinfo &rsi)
589	{	672	{
		673	if (!have_snd_auth \|\| !have_rcv_auth)
		674	return;
		675
		676	si = rsi;
		677	protocol = rsi.prot;
		678
		679	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		680	conf->nodename, (const char *)rsi,
		681	is_direct ? "direct" : "forwarded",
		682	PROTOCOL_MAJOR, prot_minor);
		683
		684	if (::conf.script_node_up)
		685	{
		686	run_script_cb *cb = new run_script_cb;
		687	cb->set<connection, &connection::script_node_up> (this);
		688	run_script_queued (cb, _("node-up command execution failed, continuing."));
		689	}
		690
		691	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		692	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		693
		694	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		695	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		696
590	if (ictx && octx)	697	if (ictx && octx)
591	{	698	{
592	connectmode = conf->connectmode;	699	// make sure rekeying timeouts are slightly asymmetric
		700	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		701	rekey.start (rekey_interval, rekey_interval);
593		702
594	rekey.start (NOW + ::conf.rekey);
595	keepalive.start (NOW + ::conf.keepalive);	703	keepalive.start (::conf.keepalive);
596		704
597	// send queued packets	705	// send queued packets
598	if (ictx && octx)	706	if (ictx && octx)
599	{	707	{
600	while (tap_packet p = (tap_packet )data_queue.get ())	708	while (tap_packet p = (tap_packet )data_queue.get ())
601	{	709	{
602	send_data_packet (p);	710	if (p->len) send_data_packet (p);
603	delete p;	711	delete p;
604	}	712	}
605		713
606	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	714	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
607	{	715	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);	716	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;	717	delete p;
610	}	718	}
611	}	719	}
		720
		721	vpn->connection_established (this);
612	}	722	}
		723	#if 0
613	else	724	else
614	{	725	{
615	retry_cnt = 0;	726	retry_cnt = 0;
616	establish_connection.start (NOW + 5);	727	establish_connection.start (5);
617	keepalive.reset ();	728	keepalive.stop ();
618	rekey.reset ();	729	rekey.stop ();
619	}	730	}
		731	#endif
620	}	732	}
621		733
622	void	734	void
623	connection::reset_si ()	735	connection::reset_si ()
624	{	736	{
		737	if (vpn->can_direct (THISNODE, conf))
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);	738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
626		739	else
627	// mask out protocols we cannot establish	740	{
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	742	protocol = 0;
		743	}
630		744
631	si.set (conf, protocol);	745	si.set (conf, protocol);
		746
		747	is_direct = si.valid ();
632	}	748	}
633		749
634	// ensure sockinfo is valid, forward if necessary	750	// ensure sockinfo is valid, forward if necessary
635	const sockinfo &	751	const sockinfo &
636	connection::forward_si (const sockinfo &si) const	752	connection::forward_si (const sockinfo &si) const
637	{	753	{
638	if (!si.valid ())	754	if (!si.valid ())
639	{	755	{
640	connection *r = vpn->find_router ();	756	connection *r = vpn->find_router_for (this);
641		757
642	if (r)	758	if (r)
643	{	759	{
644	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	760	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
645	conf->nodename, r->conf->nodename);	761	conf->nodename, r->conf->nodename);
646	return r->si;	762	return r->si;
647	}	763	}
648	else	764	else
649	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	765	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
650	conf->nodename);	766	conf->nodename);
651	}	767	}
652		768
653	return si;	769	return si;
654	}	770	}
…		…
664	connection::send_ping (const sockinfo &si, u8 pong)	780	connection::send_ping (const sockinfo &si, u8 pong)
665	{	781	{
666	ping_packet *pkt = new ping_packet;	782	ping_packet *pkt = new ping_packet;
667		783
668	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	784	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		785
		786	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
669	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	787	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		788
671	delete pkt;	789	delete pkt;
672	}	790	}
673		791
…		…
688	void	806	void
689	connection::send_auth_request (const sockinfo &si, bool initiate)	807	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	808	{
691	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	809	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
692		810
693	rsachallenge chg;	811	generate_auth_data ();
		812	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
694		813
695	rsa_cache.gen (pkt->id, chg);
696
697	if (0 > RSA_public_encrypt (sizeof chg,
698	(unsigned char )&chg, (unsigned char )&pkt->encr,
699	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
700	fatal ("RSA_public_encrypt error");
701
702	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
703
704	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
705		816
706	delete pkt;	817	delete pkt;
707	}	818	}
708		819
709	void	820	void
710	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	821	connection::send_auth_response (const sockinfo &si)
711	{	822	{
712	auth_res_packet *pkt = new auth_res_packet (conf->id);	823	auth_res_packet *pkt = new auth_res_packet (conf->id);
713		824
714	pkt->id = id;	825	auth_hash (rcv_auth, pkt->response.mac);
		826	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
715		827
716	rsa_hash (id, chg, pkt->response);
717
718	pkt->hmac_set (octx);
719
720	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	828	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
721
722	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
723		830
724	delete pkt;	831	delete pkt;
725	}	832	}
726		833
727	void	834	void
728	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
729	{	836	{
730	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
731	conf->id, rid, (const char *)rsi);	838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
732		840
733	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
734		842
735	r->hmac_set (octx);	843	r->hmac_set (octx);
736	send_vpn_packet (r, si);	844	send_vpn_packet (r, si);
737		845
738	delete r;	846	delete r;
739	}	847	}
740		848
741	void	849	inline void
742	connection::establish_connection_cb (time_watcher &w)	850	connection::establish_connection_cb (ev::timer &w, int revents)
743	{	851	{
744	if (ictx \|\| conf == THISNODE	852	if (!(ictx && octx)
		853	&& conf != THISNODE
745	\|\| connectmode == conf_node::C_NEVER	854	&& connectmode != conf_node::C_NEVER
746	\|\| connectmode == conf_node::C_DISABLED)	855	&& connectmode != conf_node::C_DISABLED
747	w.at = TSTAMP_CANCEL;	856	&& !w.is_active ())
748	else if (w.at <= NOW)
749	{	857	{
750	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
751		859	// and stop trying. should probably be handled by a per-connection expire handler.
752	if (retry_int < 3600 * 8)	860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		861	{
		862	reset_connection ();
753	retry_cnt++;	863	return;
		864	}
754		865
755	w.at = NOW + retry_int;	866	last_establish_attempt = ev_now ();
		867
		868	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		869	? (retry_cnt & 3) + 1
		870	: 1 << (retry_cnt >> 2));
756		871
757	reset_si ();	872	reset_si ();
758		873
759	if (si.prot && !si.host)	874	bool slow = si.prot & PROT_SLOW;
		875
		876	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		877	{
		878	/TODO/ /* start the timer so we don't recurse endlessly */
		879	w.start (1);
760	vpn->send_connect_request (conf->id);	880	vpn->send_connect_request (this);
		881	}
761	else	882	else
762	{	883	{
		884	if (si.valid ())
		885	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		886	conf->nodename, (const char *)si);
		887
763	const sockinfo &dsi = forward_si (si);	888	const sockinfo &dsi = forward_si (si);
		889
		890	slow = slow \|\| (dsi.prot & PROT_SLOW);
764		891
765	if (dsi.valid () && auth_rate_limiter.can (dsi))	892	if (dsi.valid () && auth_rate_limiter.can (dsi))
766	{	893	{
767	if (retry_cnt < 4)	894	if (retry_cnt < 4)
768	send_auth_request (dsi, true);	895	send_auth_request (dsi, true);
769	else	896	else
770	send_ping (dsi, 0);	897	send_ping (dsi, 0);
771	}	898	}
772	}	899	}
		900
		901	retry_int *= slow ? 8. : 0.9;
		902
		903	if (retry_int < conf->max_retry)
		904	retry_cnt++;
		905	else
		906	retry_int = conf->max_retry;
		907
		908	w.start (retry_int);
773	}	909	}
774	}	910	}
775		911
776	void	912	void
777	connection::reset_connection ()	913	connection::reset_connection ()
…		…
780	{	916	{
781	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
782	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
783		919
784	if (::conf.script_node_down)	920	if (::conf.script_node_down)
785	run_script (run_script_cb (this, &connection::script_node_down), false);	921	{
		922	run_script_cb *cb = new run_script_cb;
		923	cb->set<connection, &connection::script_node_down> (this);
		924	run_script_queued (cb, _("node-down command execution failed, continuing."));
		925	}
786	}	926	}
787		927
788	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
789	delete octx; octx = 0;	929	delete octx; octx = 0;
790		930
791	si.host= 0;	931	si.host = 0;
792		932
		933	have_snd_auth = false;
		934	have_rcv_auth = false;
		935	auth_expire = 0.;
		936
793	last_activity = 0;	937	last_activity = 0.;
		938	//last_si_change = 0.;
794	retry_cnt = 0;	939	retry_cnt = 0;
795		940
796	rekey.reset ();	941	rekey.stop ();
797	keepalive.reset ();	942	keepalive.stop ();
798	establish_connection.reset ();	943	establish_connection.stop ();
799	}	944	}
800		945
801	void	946	void
802	connection::shutdown ()	947	connection::shutdown ()
803	{	948	{
…		…
805	send_reset (si);	950	send_reset (si);
806		951
807	reset_connection ();	952	reset_connection ();
808	}	953	}
809		954
810	void	955	// poor-man's rekeying
811	connection::rekey_cb (time_watcher &w)	956	inline void
		957	connection::rekey_cb (ev::timer &w, int revents)
812	{	958	{
813	w.at = TSTAMP_CANCEL;
814
815	reset_connection ();	959	reset_connection ();
816	establish_connection ();	960	establish_connection ();
817	}	961	}
818		962
819	void	963	void
820	connection::send_data_packet (tap_packet *pkt, bool broadcast)	964	connection::send_data_packet (tap_packet *pkt)
821	{	965	{
822	vpndata_packet *p = new vpndata_packet;	966	vpndata_packet *p = new vpndata_packet;
823	int tos = 0;	967	int tos = 0;
824		968
825	// I am not hilarious about peeking into packets, but so be it.	969	// I am not hilarious about peeking into packets, but so be it.
826	if (conf->inherit_tos	970	if (conf->inherit_tos && pkt->is_ipv4 ())
827	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
828	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
829	tos = (*pkt)[15] & IPTOS_TOS_MASK;	971	tos = (*pkt)[15] & IPTOS_TOS_MASK;
830		972
831	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	973	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
832	send_vpn_packet (p, si, tos);	974	send_vpn_packet (p, si, tos);
833		975
834	delete p;	976	delete p;
835		977
836	if (oseqno > MAX_SEQNO)	978	if (oseqno > MAX_SEQNO)
837	rekey ();	979	rekey ();
838	}	980	}
839		981
840	void	982	void
		983	connection::post_inject_queue ()
		984	{
		985	// force a connection every now and when when packets are sent (max 1/s)
		986	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		987	establish_connection.stop ();
		988
		989	establish_connection ();
		990	}
		991
		992	void
841	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	993	connection::inject_data_packet (tap_packet *pkt)
842	{	994	{
843	if (ictx && octx)	995	if (ictx && octx)
844	send_data_packet (pkt, broadcast);	996	send_data_packet (pkt);
845	else	997	else
846	{	998	{
847	if (!broadcast)//DDDD
848	data_queue.put (new tap_packet (*pkt));	999	data_queue.put (new tap_packet (*pkt));
849		1000	post_inject_queue ();
850	establish_connection ();
851	}	1001	}
852	}	1002	}
853		1003
		1004	void
854	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1005	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
855	{	1006	{
856	if (ictx && octx)	1007	if (ictx && octx)
857	send_vpn_packet (pkt, si, tos);	1008	send_vpn_packet (pkt, si, tos);
858	else	1009	else
859	{	1010	{
860	vpn_queue.put (new vpn_packet (*pkt));	1011	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
861		1012	post_inject_queue ();
862	establish_connection ();
863	}	1013	}
864	}	1014	}
865		1015
866	void	1016	void
867	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1017	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
868	{	1018	{
869	last_activity = NOW;	1019	last_activity = ev_now ();
870		1020
871	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1021	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
872	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1022	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1023
		1024	if (connectmode == conf_node::C_DISABLED)
		1025	return;
873		1026
874	switch (pkt->typ ())	1027	switch (pkt->typ ())
875	{	1028	{
876	case vpn_packet::PT_PING:	1029	case vpn_packet::PT_PING:
		1030	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1031
877	// we send pings instead of auth packets after some retries,	1032	// we send pings instead of auth packets after some retries,
878	// so reset the retry counter and establish a connection	1033	// so reset the retry counter and establish a connection
879	// when we receive a ping.	1034	// when we receive a ping.
880	if (!ictx)	1035	if (!ictx)
881	{	1036	{
882	if (auth_rate_limiter.can (rsi))	1037	if (auth_rate_limiter.can (rsi))
883	send_auth_request (rsi, true);	1038	send_auth_request (rsi, true);
884	}	1039	}
885	else	1040	else
		1041	// we would love to change the socket address here, but ping's aren't
		1042	// authenticated, so we best ignore it.
886	send_ping (rsi, 1); // pong	1043	send_ping (rsi, 1); // pong
887		1044
888	break;	1045	break;
889		1046
890	case vpn_packet::PT_PONG:	1047	case vpn_packet::PT_PONG:
		1048	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1049
		1050	// a PONG might mean that the other side doesn't really know
		1051	// about our desire for communication.
		1052	establish_connection ();
891	break;	1053	break;
892		1054
893	case vpn_packet::PT_RESET:	1055	case vpn_packet::PT_RESET:
894	{	1056	{
895	reset_connection ();	1057	reset_connection ();
896		1058
897	config_packet p = (config_packet ) pkt;	1059	config_packet p = (config_packet ) pkt;
898		1060
899	if (!p->chk_config ())	1061	if (!p->chk_config ())
900	{	1062	{
901	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1063	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
902	conf->nodename, (const char *)rsi);	1064	conf->nodename, (const char *)rsi);
903	connectmode = conf_node::C_DISABLED;	1065	connectmode = conf_node::C_DISABLED;
904	}	1066	}
905	else if (connectmode == conf_node::C_ALWAYS)	1067	else if (connectmode == conf_node::C_ALWAYS)
906	establish_connection ();	1068	establish_connection ();
…		…
908	break;	1070	break;
909		1071
910	case vpn_packet::PT_AUTH_REQ:	1072	case vpn_packet::PT_AUTH_REQ:
911	if (auth_rate_limiter.can (rsi))	1073	if (auth_rate_limiter.can (rsi))
912	{	1074	{
913	auth_req_packet p = (auth_req_packet ) pkt;	1075	auth_req_packet p = (auth_req_packet )pkt;
914		1076
915	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1077	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1078	conf->nodename, p->initiate ? "initiate" : "reply",
		1079	p->protocols, p->features);
916		1080
917	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1081	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
918	{	1082	{
919	if (p->prot_minor != PROTOCOL_MINOR)	1083	if (p->prot_minor != PROTOCOL_MINOR)
920	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1084	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
921	conf->nodename, (const char *)rsi,	1085	conf->nodename, (const char *)rsi,
922	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1086	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
923		1087
924	if (p->initiate)	1088	if (p->initiate)
925	send_auth_request (rsi, false);	1089	send_auth_request (rsi, false);
926		1090
927	rsachallenge k;	1091	auth_data auth;
928		1092
929	if (0 > RSA_private_decrypt (sizeof (p->encr),	1093	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
930	(unsigned char )&p->encr, (unsigned char )&k,	1094	{
931	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
932	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1095	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
933	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1096	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1097	}
934	else	1098	else
935	{	1099	{
936	delete octx;	1100	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
937		1101
938	octx = new crypto_ctx (k, 1);	1102	rcv_auth = auth;
939	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1103	have_rcv_auth = true;
940		1104
		1105	send_auth_response (rsi);
		1106
		1107	if (chg)
		1108	{
941	conf->protocols = p->protocols;	1109	conf->protocols = p->protocols;
		1110	features = p->features & config_packet::get_features ();
942		1111
943	send_auth_response (rsi, p->id, k);
944
945	connection_established ();	1112	connection_established (rsi);
946
947	break;	1113	}
948	}	1114	}
		1115
		1116	break;
949	}	1117	}
950	else	1118	else
951	slog (L_WARN, _("%s(%s): protocol mismatch"),	1119	slog (L_WARN, _("%s(%s): protocol mismatch."),
952	conf->nodename, (const char *)rsi);	1120	conf->nodename, (const char *)rsi);
953		1121
954	send_reset (rsi);	1122	send_reset (rsi);
955	}	1123	}
956		1124
957	break;	1125	break;
958		1126
959	case vpn_packet::PT_AUTH_RES:	1127	case vpn_packet::PT_AUTH_RES:
960	{	1128	{
961	auth_res_packet p = (auth_res_packet ) pkt;	1129	auth_res_packet p = (auth_res_packet )pkt;
962		1130
963	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1131	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
964		1132
965	if (p->chk_config ())	1133	if (p->chk_config ())
966	{	1134	{
967	if (p->prot_minor != PROTOCOL_MINOR)	1135	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
968	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
969	conf->nodename, (const char *)rsi,
970	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
971
972	rsachallenge chg;
973
974	if (!rsa_cache.find (p->id, chg))
975	{	1136	{
976	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1137	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
977	conf->nodename, (const char *)rsi);	1138	conf->nodename, (const char *)rsi);
978	break;
979	}	1139	}
980	else	1140	else if (!have_snd_auth)
981	{	1141	{
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1142	if (p->prot_minor != PROTOCOL_MINOR)
983		1143	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
984	if (!p->hmac_chk (cctx))
985	{
986	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
987	"could be an attack, or just corruption or an synchronization error"),
988	conf->nodename, (const char *)rsi);	1144	conf->nodename, (const char *)rsi,
989	break;	1145	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
990	}
991	else
992	{
993	rsaresponse h;
994		1146
995	rsa_hash (p->id, chg, h);
996
997	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
998	{
999	prot_minor = p->prot_minor;	1147	prot_minor = p->prot_minor;
		1148	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
1000		1149
1001	delete ictx; ictx = cctx;	1150	have_snd_auth = true;
1002
1003	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1004
1005	si = rsi;
1006	protocol = rsi.prot;
1007
1008	connection_established ();	1151	connection_established (rsi);
1009
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)
1015	run_script (run_script_cb (this, &connection::script_node_up), false);
1016
1017	break;
1018	}
1019	else
1020	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1021	conf->nodename, (const char *)rsi);
1022	}
1023
1024	delete cctx;
1025	}	1152	}
		1153
		1154	break;
1026	}	1155	}
1027	}	1156	}
1028		1157
1029	send_reset (rsi);	1158	send_reset (rsi);
1030	break;	1159	break;
…		…
1041	{	1170	{
1042	vpndata_packet p = (vpndata_packet )pkt;	1171	vpndata_packet p = (vpndata_packet )pkt;
1043		1172
1044	if (!p->hmac_chk (ictx))	1173	if (!p->hmac_chk (ictx))
1045	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1174	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1046	"could be an attack, or just corruption or an synchronization error"),	1175	"could be an attack, or just corruption or a synchronization error."),
1047	conf->nodename, (const char *)rsi);	1176	conf->nodename, (const char *)rsi);
1048	else	1177	else
1049	{	1178	{
1050	u32 seqno;	1179	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1180	tap_packet *d = p->unpack (this, seqno);
		1181	int seqclass = iseqno.seqno_classify (seqno);
1052		1182
1053	if (iseqno.recv_ok (seqno))	1183	if (seqclass == 0) // ok
1054	{	1184	{
1055	vpn->tap->send (d);	1185	vpn->tap->send (d);
1056		1186
1057	if (p->dst () == 0) // re-broadcast
1058	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1059	{
1060	connection c = i;
1061
1062	if (c->conf != THISNODE && c->conf != conf)
1063	c->inject_data_packet (d);
1064	}
1065
1066	if (si != rsi)	1187	if (si != rsi)
1067	{	1188	{
1068	// fast re-sync on connection changes, useful especially for tcp/ip	1189	// fast re-sync on source address changes, useful especially for tcp/ip
		1190	//if (last_si_change < ev_now () + 5.)
1069	si = rsi;	1191	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1192	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	conf->nodename, (const char )si, (const char )rsi);	1193	conf->nodename, (const char )si, (const char )rsi);
		1194
		1195	si = rsi;
		1196
		1197	if (::conf.script_node_change)
		1198	{
		1199	run_script_cb *cb = new run_script_cb;
		1200	cb->set<connection, &connection::script_node_change> (this);
		1201	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1202	}
		1203
		1204	// }
		1205	//else
		1206	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1207	// conf->nodename, (const char )si, (const char )rsi);
1073	}	1208	}
1074
1075	delete d;
1076
1077	break;
1078	}	1209	}
		1210	else if (seqclass == 1) // far history
		1211	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1214	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 3) // reset
		1217	{
		1218	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1219	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1220	send_reset (rsi);
		1221	}
		1222
		1223	delete d;
		1224	break;
1079	}	1225	}
1080	}	1226	}
1081		1227
1082	send_reset (rsi);	1228	send_reset (rsi);
1083	break;	1229	break;
1084		1230
1085	case vpn_packet::PT_CONNECT_REQ:	1231	case vpn_packet::PT_CONNECT_REQ:
1086	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1232	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1087	{	1233	{
1088	connect_req_packet p = (connect_req_packet ) pkt;	1234	connect_req_packet p = (connect_req_packet )pkt;
1089		1235
1090	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1236	if (p->id > 0 && p->id <= vpn->conns.size ())
1091	connection *c = vpn->conns[p->id - 1];
1092	conf->protocols = p->protocols;
1093
1094	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1095	conf->id, p->id, c->ictx && c->octx);
1096
1097	if (c->ictx && c->octx)
1098	{	1237	{
		1238	connection *c = vpn->conns[p->id - 1];
		1239	conf->protocols = p->protocols;
		1240
		1241	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1242	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1243	p->protocols,
		1244	c->ictx && c->octx);
		1245
		1246	if (c->ictx && c->octx)
		1247	{
1099	// send connect_info packets to both sides, in case one is	1248	// send connect_info packets to both sides, in case one is
1100	// behind a nat firewall (or both ;)	1249	// behind a nat firewall (or both ;)
1101	c->send_connect_info (conf->id, si, conf->protocols);	1250	c->send_connect_info (conf->id, si, conf->protocols);
1102	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1251	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1252	}
		1253	else
		1254	c->establish_connection ();
1103	}	1255	}
1104	else	1256	else
1105	c->establish_connection ();	1257	slog (L_WARN,
		1258	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1259	p->id);
1106	}	1260	}
1107		1261
1108	break;	1262	break;
1109		1263
1110	case vpn_packet::PT_CONNECT_INFO:	1264	case vpn_packet::PT_CONNECT_INFO:
1111	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1265	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1112	{	1266	{
1113	connect_info_packet p = (connect_info_packet ) pkt;	1267	connect_info_packet p = (connect_info_packet )pkt;
1114		1268
1115	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1269	if (p->id > 0 && p->id <= vpn->conns.size ())
1116		1270	{
1117	connection *c = vpn->conns[p->id - 1];	1271	connection *c = vpn->conns[p->id - 1];
1118		1272
1119	c->conf->protocols = p->protocols;	1273	c->conf->protocols = p->protocols;
1120	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1274	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1121	p->si.upgrade_protocol (protocol, c->conf);	1275	p->si.upgrade_protocol (protocol, c->conf);
1122		1276
1123	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1277	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1124	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1278	conf->nodename,
		1279	vpn->conns[p->id - 1]->conf->nodename,
		1280	(const char *)p->si,
		1281	p->protocols,
		1282	protocol,
		1283	p->si.supported_protocols (c->conf),
		1284	!c->ictx && !c->octx);
1125		1285
1126	const sockinfo &dsi = forward_si (p->si);	1286	const sockinfo &dsi = forward_si (p->si);
1127		1287
1128	if (dsi.valid ())	1288	if (dsi.valid ())
1129	c->send_auth_request (dsi, true);	1289	c->send_auth_request (dsi, true);
		1290	else
		1291	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si);
		1294	}
		1295	else
		1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
1130	}	1299	}
1131		1300
1132	break;	1301	break;
1133		1302
1134	default:	1303	default:
1135	send_reset (rsi);	1304	send_reset (rsi);
1136	break;	1305	break;
1137	}	1306	}
1138	}	1307	}
1139		1308
1140	void connection::keepalive_cb (time_watcher &w)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1311	{
1142	if (NOW >= last_activity + ::conf.keepalive + 30)	1312	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1313
		1314	if (when >= 0)
		1315	w.start (when);
		1316	else if (when < -15)
1143	{	1317	{
1144	reset_connection ();	1318	reset_connection ();
1145	establish_connection ();	1319	establish_connection ();
1146	}	1320	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.at = last_activity + ::conf.keepalive;
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1321	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1322	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1323	{
		1324	w.start (3);
1152	send_ping (si);	1325	send_ping (si);
1153	w.at = NOW + 5;
1154	}	1326	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1327	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1328	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1329	// should delete octx, though, or something like that ;)
1158	w.at = last_activity + ::conf.keepalive + 10;	1330	w.start (when + 10);
1159	else	1331	else
1160	reset_connection ();	1332	reset_connection ();
1161	}	1333	}
1162		1334
		1335	void
1163	void connection::send_connect_request (int id)	1336	connection::send_connect_request (int id)
1164	{	1337	{
1165	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1338	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1166		1339
1167	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1340	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1341	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1342	THISNODE->protocols);
1168	p->hmac_set (octx);	1343	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1344	send_vpn_packet (p, si);
1170		1345
1171	delete p;	1346	delete p;
1172	}	1347	}
1173		1348
1174	void connection::script_node ()	1349	void
		1350	connection::script_init_env (const char *ext)
1175	{	1351	{
1176	vpn->script_if_up ();
1177
1178	char *env;	1352	char *env;
		1353	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1354	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1355	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1356	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1357	conf->id & 0xff); putenv (env);
		1358	}
		1359
		1360	void
		1361	connection::script_init_connect_env ()
		1362	{
		1363	vpn->script_init_env ();
		1364
		1365	char *env;
1179	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1366	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1367	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1180	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1368	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1181	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1369	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1182	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1370	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1183	}	1371	}
1184		1372
		1373	inline const char *
1185	const char *connection::script_node_up ()	1374	connection::script_node_up ()
1186	{	1375	{
1187	script_node ();	1376	script_init_connect_env ();
1188		1377
1189	putenv ("STATE=up");	1378	putenv ((char *)"STATE=up");
1190		1379
		1380	char *filename;
		1381	asprintf (&filename,
		1382	"%s/%s",
		1383	confbase,
1191	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1384	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1192	}
1193		1385
		1386	return filename;
		1387	}
		1388
		1389	inline const char *
		1390	connection::script_node_change ()
		1391	{
		1392	script_init_connect_env ();
		1393
		1394	putenv ((char *)"STATE=change");
		1395
		1396	char *filename;
		1397	asprintf (&filename,
		1398	"%s/%s",
		1399	confbase,
		1400	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1401
		1402	return filename;
		1403	}
		1404
		1405	inline const char *
1194	const char *connection::script_node_down ()	1406	connection::script_node_down ()
1195	{	1407	{
1196	script_node ();	1408	script_init_connect_env ();
1197		1409
1198	putenv ("STATE=down");	1410	putenv ((char *)"STATE=down");
1199		1411
1200	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1412	char *filename;
1201	}	1413	asprintf (&filename,
		1414	"%s/%s",
		1415	confbase,
		1416	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1202		1417
		1418	return filename;
		1419	}
		1420
1203	connection::connection(struct vpn *vpn_)	1421	connection::connection (struct vpn vpn, conf_node conf)
1204	: vpn(vpn_)	1422	: vpn(vpn), conf(conf),
1205	, rekey (this, &connection::rekey_cb)	1423	#if ENABLE_DNS
1206	, keepalive (this, &connection::keepalive_cb)	1424	dns (0),
		1425	#endif
		1426	data_queue(conf->max_ttl, conf->max_queue + 1),
		1427	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1428	{
		1429	rekey .set<connection, &connection::rekey_cb > (this);
		1430	keepalive .set<connection, &connection::keepalive_cb > (this);
1207	, establish_connection (this, &connection::establish_connection_cb)	1431	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1208	{	1432
		1433	last_establish_attempt = 0.;
1209	octx = ictx = 0;	1434	octx = ictx = 0;
1210	retry_cnt = 0;
1211		1435
1212	connectmode = conf_node::C_ALWAYS; // initial setting	1436	connectmode = conf->connectmode;
		1437
		1438	// queue a dummy packet to force an initial connection attempt
		1439	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1440	vpn_queue.put (new net_packet);
		1441
1213	reset_connection ();	1442	reset_connection ();
1214	}	1443	}
1215		1444
1216	connection::~connection ()	1445	connection::~connection ()
1217	{	1446	{
1218	shutdown ();	1447	shutdown ();
1219	}	1448	}
1220		1449
		1450	void
1221	void connection_init ()	1451	connection_init ()
1222	{	1452	{
1223	auth_rate_limiter.clear ();	1453	auth_rate_limiter.clear ();
1224	reset_rate_limiter.clear ();	1454	reset_rate_limiter.clear ();
1225	}	1455	}
1226		1456

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Comparing gvpe/src/connection.C (file contents): Revision 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs. Revision 1.98 by root, Tue Jul 16 16:44:36 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.98 by root, Tue Jul 16 16:44:36 2013 UTC