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

Comparing gvpe/src/connection.C (file contents):
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 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) 2003-2008,2010,2011,2013 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
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
32		50
33	#include "conf.h"	51	#include "conf.h"
34	#include "slog.h"	52	#include "slog.h"
35	#include "device.h"	53	#include "device.h"
36	#include "vpn.h"	54	#include "vpn.h"
37	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
38		57
39	#include "netcompat.h"	58	#include "netcompat.h"
40		59
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
46		61
47	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
48	#define HLOG 15	63	#define HLOG 15
49	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
52		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb cb, const char warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
53	struct crypto_ctx	112	struct crypto_ctx
54	{	113	{
55	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	115	HMAC_CTX hctx;
57		116
58	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	118	~crypto_ctx ();
60	};	119	};
61		120
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
64	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	153	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	154	}
69		155
70	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
71	{	157	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
74	}	160	}
75		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
76	static void	189	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	191	{
79	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	196	}
88		197
89	struct rsa_entry {	198	void
90	tstamp expire;	199	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	200	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		206
139	} rsa_cache;	207	// eventual response data
140		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	209	}
145	w.start (NOW + RSA_TTL);
146		210
147	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
148	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	213	}
154		214
155	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
156		216
157	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
158	{	219	{
159	if (queue[i])	220	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		221
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;	222	i = 0;
187	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	226	}
189		227
190	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
191	{	229	{
192	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
193	delete queue[i];	233	delete [] queue;
194	}	234	}
195		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
196	struct net_rateinfo {	292	struct net_rateinfo
		293	{
197	u32 host;	294	u32 host;
198	double pcnt, diff;	295	double pcnt, diff;
199	tstamp last;	296	tstamp last;
200	};	297	};
201		298
211		308
212	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	310	bool can (u32 host);
214	};	311	};
215		312
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		314
		315	bool
218	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
219	{	317	{
220	iterator i;	318	iterator i;
221		319
222	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
223	if (i->host == host)	321	if (i->host == host)
224	break;	322	break;
225	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	324	i = erase (i);
227	else	325	else
228	i++;	326	i++;
229		327
230	if (i == end ())	328	if (i == end ())
…		…
232	net_rateinfo ri;	330	net_rateinfo ri;
233		331
234	ri.host = host;	332	ri.host = host;
235	ri.pcnt = 1.;	333	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	335	ri.last = ev_now ();
238		336
239	push_front (ri);	337	push_front (ri);
240		338
241	return true;	339	return true;
242	}	340	}
…		…
244	{	342	{
245	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
246	erase (i);	344	erase (i);
247		345
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		348
251	ri.last = NOW;	349	ri.last = ev_now ();
252		350
253	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
254		352
255	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
256		354
…		…
268	}	366	}
269	}	367	}
270		368
271	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
272		370
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
276	{	373	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
280		375
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	379	}
286		380
287	void	381	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	383	{
290	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		385	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	387	}
294		388
295	bool	389	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	391	{
298	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		393	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	395	}
302		396
		397	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	399	{
305	type = type_;	400	type = type_;
306		401
307	int src = THISNODE->id;	402	int src = THISNODE->id;
308		403
…		…
313		408
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		411
317	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
318	{	421	{
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;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	423	}
		424	};
330		425
331	void	426	void
332	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)
333	{	428	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
337		432
338	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
340		435
341	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
342	{	437	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		439
345	if (cl)	440	if (cl)
346	{	441	{
…		…
352	d[1] = cl;	447	d[1] = cl;
353	}	448	}
354	}	449	}
355	#endif	450	#endif
356		451
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		453
359	struct {	454	struct {
360	#if RAND_SIZE	455	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
362	#endif	457	#endif
363	u32 seqno;	458	u32 seqno;
364	} datahdr;	459	} datahdr;
365		460
366	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	462	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	// NB: a constant (per session) random prefix
		464	// is likely enough, but we don't take any chances.
		465	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	466	#endif
370		467
371	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	492	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
397	u8 *d;	494	u8 *d;
398	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
399		496
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		498
402	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
404		501
405	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	503	d = cdata;
407	else	504	else
408	#endif	505	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
410		507
411	/* this overwrites part of the src mac, but we fix that later */	508	// we play do evil games with the struct layout atm.
		509	// pending better solutions, we at least do some verification.
		510	// this is fine, as we left ISO territory long ago.
		511	require (DATAHDR <= 16);
		512	require ((u8 )(&p->len + 1) == &(p)[0]);
		513
		514	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	516	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	518	outl += outl2;
416		519
…		…
447	}	550	}
448	};	551	};
449		552
450	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
451	{	554	{
452	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
458		559
459	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
460	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		562
462	static u8 get_features ()	563	static u8 get_features ()
463	{	564	{
464	u8 f = 0;	565	u8 f = 0;
465	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
466	f \|= FEATURE_COMPRESSION;	567	f \|= FEATURE_COMPRESSION;
467	#endif	568	#endif
468	#if ENABLE_ROHC	569	#if ENABLE_ROHC
469	f \|= FEATURE_ROHC;	570	f \|= FEATURE_ROHC;
470	#endif	571	#endif
		572	#if ENABLE_BRIDGING
		573	f \|= FEATURE_BRIDGING;
		574	#endif
471	return f;	575	return f;
472	}	576	}
473	};	577	};
474		578
		579	void
475	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
476	{	581	{
477	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	585	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	586	features = get_features ();
484		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		593
489	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	595	set_hdr (type, dst);
491	}	596	}
492		597
493	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	600	{
495	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	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))
506	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, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	611	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		613	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		614	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		615	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		619
		620	if (cmp > 0)
		621	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		622	conf->nodename, (const char *)rsi);
		623	else if (cmp == 0)
514	return true;	624	return true;
		625	}
515		626
516	return false;	627	return false;
517	}	628	}
518		629
519	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
520	{	631	{
521	char magic[8];	632	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	635	u8 pad2, pad3;
525	rsaid id;	636	auth_encr encr;
526	rsaencrdata encr;
527		637
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	639	{
530	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	642	initiate = !!initiate_;
533	protocols = protocols_;	643	protocols = protocols_;
534		644
535	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
536	}	646	}
537	};	647	};
538		648
539	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	650	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	651	auth_response response;
545		652
546	auth_res_packet (int dst)	653	auth_res_packet (int dst)
547	{	654	{
548	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
549		656
550	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
551	}	658	}
552	};	659	};
553		660
…		…
583	};	690	};
584		691
585	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
586		693
587	void	694	void
588	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
589	{	696	{
590	if (ictx && octx)	697	if (!have_snd_auth \|\| !have_rcv_auth)
		698	return;
		699
		700	si = rsi;
		701	protocol = rsi.prot;
		702
		703	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		704	conf->nodename, (const char *)rsi,
		705	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		706	PROTOCOL_MAJOR, prot_minor);
		707
		708	if (::conf.script_node_up)
		709	{
		710	run_script_cb *cb = new run_script_cb;
		711	cb->set<connection, &connection::script_node_up> (this);
		712	run_script_queued (cb, _("node-up command execution failed, continuing."));
591	{	713	}
592	connectmode = conf->connectmode;	714
		715	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		716	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
593		717
		718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
594	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
596	+ (conf->id > THISNODE->id ? 10 : 0));	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
597	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
598		730
599	// send queued packets	731	// send queued packets
600	if (ictx && octx)
601	{
602	while (tap_packet p = (tap_packet )data_queue.get ())	732	while (tap_packet p = (tap_packet )data_queue.get ())
603	{	733	{
604	send_data_packet (p);	734	if (p->len) send_data_packet (p);
605	delete p;	735	delete p;
606	}	736	}
607		737
608	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	738	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
609	{	739	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;	741	delete p;
612	}
613	}
614	}	742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
		748	connection::reset_si ()
		749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
615	else	752	else
616	{	753	{
617	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
618	establish_connection.start (NOW + 5);	755	protocol = 0;
619	keepalive.stop ();
620	rekey.stop ();
621	}	756	}
622	}
623
624	void
625	connection::reset_si ()
626	{
627	protocol = best_protocol (THISNODE->protocols & conf->protocols);
628
629	// mask out protocols we cannot establish
630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
632	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
633		757
634	si.set (conf, protocol);	758	si.set (conf, protocol);
635	}	759	}
636		760
637	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
638	const sockinfo &	762	const sockinfo &
639	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
640	{	764	{
641	if (!si.valid ())	765	if (!si.valid ())
642	{	766	{
643	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
644		768
645	if (r)	769	if (r)
646	{	770	{
647	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
648	conf->nodename, r->conf->nodename);	772	conf->nodename, r->conf->nodename);
649	return r->si;	773	return r->si;
650	}	774	}
651	else	775	else
652	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
653	conf->nodename);	777	conf->nodename);
654	}	778	}
655		779
656	return si;	780	return si;
657	}	781	}
658		782
659	void	783	void
660	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
661	{	785	{
662	bool ok;	786	if (!vpn->send_vpn_packet (pkt, si, tos))
663		787	reset_connection ("packet send error");
664	switch (si.prot)
665	{
666	case PROT_IPv4:
667	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
668	case PROT_UDPv4:
669	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
670	#if ENABLE_TCP
671	case PROT_TCPv4:
672	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
673	#endif
674	#if ENABLE_ICMP
675	case PROT_ICMPv4:
676	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
677	#endif
678	#if ENABLE_DNS
679	case PROT_DNSv4:
680	ok = send_dnsv4_packet (pkt, si, tos); break;
681	#endif
682
683	default:
684	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
685	ok = false;
686	}
687
688	if (!ok)
689	reset_connection ();
690	}	788	}
691		789
692	void	790	void
693	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
694	{	792	{
695	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
696		794
697	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	795	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		796
		797	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
698	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
699		799
700	delete pkt;	800	delete pkt;
701	}	801	}
702		802
…		…
717	void	817	void
718	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
719	{	819	{
720	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	820	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
721		821
722	rsachallenge chg;	822	generate_auth_data ();
723	rsa_cache.gen (pkt->id, chg);
724	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
725		824
726	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	825	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
727
728	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
729		827
730	delete pkt;	828	delete pkt;
731	}	829	}
732		830
733	void	831	void
734	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
735	{	833	{
736	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
737		835
738	pkt->id = id;	836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		837	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
739		838
740	rsa_hash (id, chg, pkt->response);
741
742	pkt->hmac_set (octx);
743
744	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
745
746	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
747		841
748	delete pkt;	842	delete pkt;
749	}	843	}
750		844
751	void	845	void
752	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
753	{	847	{
754	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
755	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
756		851
757	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	852	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
758		853
759	r->hmac_set (octx);	854	r->hmac_set (octx);
760	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
761		856
762	delete r;	857	delete r;
763	}	858	}
764		859
765	void	860	inline void
766	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
767	{	862	{
768	if (!ictx	863	if (!(ictx && octx)
769	&& conf != THISNODE	864	&& conf != THISNODE
770	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
771	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
772	&& NOW > w.at)	867	&& !w.is_active ())
773	{	868	{
774	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
775		870	// and stop trying. should probably be handled by a per-connection expire handler.
776	if (retry_int < conf->max_retry)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
777	retry_cnt++;	874	return;
778	else	875	}
779	retry_int = conf->max_retry;
780		876
781	w.start (NOW + retry_int);	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		880	? (retry_cnt & 3) + 1
		881	: 1 << (retry_cnt >> 2));
782		882
783	reset_si ();	883	reset_si ();
784		884
785	if (si.prot && !si.host)	885	bool slow = (si.prot & PROT_SLOW) \|\| (conf->low_power \|\| THISNODE->low_power);
		886
		887	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		888	{
		889	/TODO/ /* start the timer so we don't recurse endlessly */
		890	w.start (1);
786	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
787	else	893	else
788	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
789	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow \|\| (dsi.prot & PROT_SLOW);
790		902
791	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
792	{	904	{
793	if (retry_cnt < 4)	905	// use ping after the first few retries
		906	// TODO: on rekeys, the other node might not interpret ping correctly,
		907	// TODO: as it will still have a valid connection
		908	if (retry_cnt < 4 && (!conf->low_power \|\| THISNODE->low_power))
794	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
795	else	910	else
796	send_ping (dsi, 0);	911	send_ping (dsi, 0);
797	}	912	}
798	}	913	}
799	}
800	}
801		914
		915	retry_int *= slow ? 4. : 0.9;
		916
		917	if (retry_int < conf->max_retry)
		918	retry_cnt++;
		919	else
		920	retry_int = conf->max_retry;
		921
		922	w.start (retry_int);
		923	}
		924	}
		925
802	void	926	void
803	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
804	{	928	{
805	if (ictx && octx)	929	if (ictx && octx)
806	{	930	{
807	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
809		933
810	if (::conf.script_node_down)	934	if (::conf.script_node_down)
811	run_script (run_script_cb (this, &connection::script_node_down), false);	935	{
		936	run_script_cb *cb = new run_script_cb;
		937	cb->set<connection, &connection::script_node_down> (this);
		938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
812	}	940	}
813		941
814	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
815	delete octx; octx = 0;	943	delete octx; octx = 0;
816		944
817	si.host = 0;	945	si.host = 0;
818		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
819	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
820	retry_cnt = 0;	953	retry_cnt = 0;
821		954
822	rekey.stop ();	955	rekey.stop ();
823	keepalive.stop ();	956	keepalive.stop ();
824	establish_connection.stop ();	957	establish_connection.stop ();
…		…
828	connection::shutdown ()	961	connection::shutdown ()
829	{	962	{
830	if (ictx && octx)	963	if (ictx && octx)
831	send_reset (si);	964	send_reset (si);
832		965
833	reset_connection ();	966	reset_connection ("shutdown");
834	}	967	}
835		968
836	void	969	// poor-man's rekeying
837	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
838	{	972	{
839	reset_connection ();	973	reset_connection ("rekeying");
840	establish_connection ();	974	establish_connection ();
841	}	975	}
842		976
843	void	977	void
844	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
858	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
859	rekey ();	993	rekey ();
860	}	994	}
861		995
862	void	996	void
		997	connection::post_inject_queue ()
		998	{
		999	// force a connection every now and when when packets are sent (max 1/s)
		1000	if (ev_now () - last_establish_attempt >= (conf->low_power \|\| THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1001	establish_connection.stop ();
		1002
		1003	establish_connection ();
		1004	}
		1005
		1006	void
863	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
864	{	1008	{
865	if (ictx && octx)	1009	if (ictx && octx)
866	send_data_packet (pkt);	1010	send_data_packet (pkt);
867	else	1011	else
868	{	1012	{
869	if (!broadcast)//DDDD
870	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
871		1014	post_inject_queue ();
872	establish_connection ();
873	}	1015	}
874	}	1016	}
875		1017
		1018	void
876	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
877	{	1020	{
878	if (ictx && octx)	1021	if (ictx && octx)
879	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
880	else	1023	else
881	{	1024	{
882	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
883		1026	post_inject_queue ();
884	establish_connection ();
885	}	1027	}
886	}	1028	}
887		1029
888	void	1030	void
889	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
890	{	1032	{
891	last_activity = NOW;	1033	last_activity = ev_now ();
892		1034
893	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1035	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
894	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1036	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1037
		1038	if (connectmode == conf_node::C_DISABLED)
		1039	return;
895		1040
896	switch (pkt->typ ())	1041	switch (pkt->typ ())
897	{	1042	{
898	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
899	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
900	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
901	// when we receive a ping.	1048	// when we receive a ping.
902	if (!ictx)	1049	if (!ictx)
903	{	1050	{
904	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
905	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
906	}	1053	}
907	else	1054	else
		1055	// we would love to change the socket address here, but ping's aren't
		1056	// authenticated, so we best ignore it.
908	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
909		1058
910	break;	1059	break;
911		1060
912	case vpn_packet::PT_PONG:	1061	case vpn_packet::PT_PONG:
		1062	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1063
		1064	// a PONG might mean that the other side doesn't really know
		1065	// about our desire for communication.
		1066	establish_connection ();
913	break;	1067	break;
914		1068
915	case vpn_packet::PT_RESET:	1069	case vpn_packet::PT_RESET:
		1070	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1071
		1072	if (ictx && octx)
916	{	1073	{
917	reset_connection ();	1074	reset_connection ("remote reset");
918		1075
919	config_packet p = (config_packet ) pkt;	1076	config_packet p = (config_packet ) pkt;
920		1077
921	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
922	{
923	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
924	conf->nodename, (const char *)rsi);
925	connectmode = conf_node::C_DISABLED;
926	}
927	else if (connectmode == conf_node::C_ALWAYS)
928	establish_connection ();	1079	establish_connection ();
929	}	1080	}
		1081
930	break;	1082	break;
931		1083
932	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
933	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
934	{	1086	{
935	auth_req_packet p = (auth_req_packet ) pkt;	1087	auth_req_packet p = (auth_req_packet )pkt;
936		1088
937	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1089	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1090	conf->nodename, p->initiate ? "initiate" : "reply",
		1091	p->protocols, p->features);
938		1092
939	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1093	if (memcmp (p->magic, MAGIC, 8))
		1094	{
		1095	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1096	conf->nodename, (const char *)rsi);
		1097	}
		1098	else if (p->chk_config (conf, rsi))
940	{	1099	{
941	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
942	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1101	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
943	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
944	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
945		1104
946	if (p->initiate)	1105	if (p->initiate)
		1106	{
947	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
948		1108
949	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
950		1112
		1113	auth_data auth;
		1114
951	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
952	{	1116	{
953	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
954	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
955	break;
956	}	1119	}
957	else	1120	else
958	{	1121	{
959	delete octx;	1122	bool chg = !have_rcv_auth \|\| !slow_memeq (&rcv_auth, &auth, sizeof auth);
960		1123
961	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
962	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
963		1126
964	// compatibility code, remove when no longer required	1127	send_auth_response (rsi);
965	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
966		1128
		1129	if (chg)
		1130	{
967	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
968	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
969		1133
970	send_auth_response (rsi, p->id, k);
971
972	connection_established ();	1134	connection_established (rsi);
973
974	break;	1135	}
975	}	1136	}
		1137
		1138	break;
976	}	1139	}
977	else
978	slog (L_WARN, _("%s(%s): protocol mismatch"),
979	conf->nodename, (const char *)rsi);
980		1140
981	send_reset (rsi);	1141	send_reset (rsi);
982	}	1142	}
983		1143
984	break;	1144	break;
985		1145
986	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
987	{	1147	{
988	auth_res_packet p = (auth_res_packet ) pkt;	1148	auth_res_packet p = (auth_res_packet )pkt;
989		1149
990	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
991		1151
992	if (p->chk_config ())	1152	auth_mac local_mac;
		1153	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1154
		1155	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
993	{	1156	{
994	if (p->prot_minor != PROTOCOL_MINOR)
995	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
996	conf->nodename, (const char *)rsi,
997	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
998
999	rsachallenge chg;
1000
1001	if (!rsa_cache.find (p->id, chg))
1002	{
1003	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1004	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
1005	break;
1006	}	1159	}
1007	else	1160	else if (!have_snd_auth)
1008	{	1161	{
1009	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1010		1163
1011	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
1012	{
1013	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1014	"could be an attack, or just corruption or a synchronization error"),
1015	conf->nodename, (const char *)rsi);
1016	break;
1017	}
1018	else
1019	{
1020	rsaresponse h;
1021
1022	rsa_hash (p->id, chg, h);
1023
1024	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1025	{
1026	prot_minor = p->prot_minor;
1027
1028	delete ictx; ictx = cctx;
1029
1030	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1031
1032	si = rsi;
1033	protocol = rsi.prot;
1034
1035	connection_established ();	1165	connection_established (rsi);
1036
1037	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1038	conf->nodename, (const char *)rsi,
1039	p->prot_major, p->prot_minor);
1040
1041	if (::conf.script_node_up)
1042	run_script (run_script_cb (this, &connection::script_node_up), false);
1043
1044	break;
1045	}
1046	else
1047	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1048	conf->nodename, (const char *)rsi);
1049	}
1050
1051	delete cctx;
1052	}
1053	}	1166	}
1054	}	1167	}
1055
1056	send_reset (rsi);
1057	break;	1168	break;
1058		1169
1059	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1060	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1061	send_reset (rsi);	1172	send_reset (rsi);
…		…
1067	if (ictx && octx)	1178	if (ictx && octx)
1068	{	1179	{
1069	vpndata_packet p = (vpndata_packet )pkt;	1180	vpndata_packet p = (vpndata_packet )pkt;
1070		1181
1071	if (!p->hmac_chk (ictx))	1182	if (!p->hmac_chk (ictx))
		1183	{
		1184	// rekeying often creates temporary hmac auth floods
		1185	// we assume they don't take longer than a few seconds normally,
		1186	// and suppress messages and resets during that time.
		1187	//TODO: should be done per source address
		1188	if (!hmac_error)
		1189	{
		1190	hmac_error = ev_now () + 3;
		1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
		1195	else
		1196	{
1072	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1073	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1074	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1075	else	1203	else
1076	{	1204	{
1077	u32 seqno;	1205	u32 seqno;
1078	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1079		1208
1080	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1081	{	1212	{
1082	vpn->tap->send (d);	1213	vpn->tap->send (d);
1083		1214
1084	if (si != rsi)	1215	if (si != rsi)
1085	{	1216	{
1086	// fast re-sync on connection changes, useful especially for tcp/ip	1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
1087	si = rsi;	1219	// {
1088
1089	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1090	conf->nodename, (const char )si, (const char )rsi);	1221	conf->nodename, (const char )si, (const char )rsi);
		1222
		1223	si = rsi;
		1224
		1225	if (::conf.script_node_change)
		1226	{
		1227	run_script_cb *cb = new run_script_cb;
		1228	cb->set<connection, &connection::script_node_change> (this);
		1229	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1230	}
		1231
		1232	// }
		1233	//else
		1234	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1235	// conf->nodename, (const char )si, (const char )rsi);
1091	}	1236	}
		1237	}
		1238	else if (seqclass == 1) // far history
		1239	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1240	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1241	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1242	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1243	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1244	else if (seqclass == 3) // reset
		1245	{
		1246	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1247	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1248	send_reset (rsi);
1092	}	1249	}
1093		1250
1094	delete d;	1251	delete d;
1095	break;	1252	break;
1096	}	1253	}
…		…
1100	break;	1257	break;
1101		1258
1102	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1103	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1104	{	1261	{
1105	connect_req_packet p = (connect_req_packet ) pkt;	1262	connect_req_packet p = (connect_req_packet )pkt;
1106		1263
1107	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1108	connection *c = vpn->conns[p->id - 1];
1109	conf->protocols = p->protocols;
1110
1111	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1112	conf->id, p->id, c->ictx && c->octx);
1113
1114	if (c->ictx && c->octx)
1115	{	1265	{
		1266	connection *c = vpn->conns[p->id - 1];
		1267	conf->protocols = p->protocols;
		1268
		1269	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1270	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1271	p->protocols,
		1272	c->ictx && c->octx);
		1273
		1274	if (c->ictx && c->octx)
		1275	{
1116	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1117	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1118	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1119	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1279	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1280	}
		1281	else
		1282	c->establish_connection ();
1120	}	1283	}
1121	else	1284	else
1122	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1123	}	1288	}
1124		1289
1125	break;	1290	break;
1126		1291
1127	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1128	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1129	{	1294	{
1130	connect_info_packet p = (connect_info_packet )pkt;	1295	connect_info_packet p = (connect_info_packet )pkt;
1131		1296
1132	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1297	if (p->id > 0 && p->id <= vpn->conns.size ())
1133	{	1298	{
1134	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1135		1300
1136	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1137	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1138	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1139		1304
1140	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1141	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1306	conf->nodename,
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si,
		1309	p->protocols,
		1310	protocol,
		1311	p->si.supported_protocols (c->conf),
		1312	!c->ictx && !c->octx);
1142		1313
1143	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1144		1315
1145	if (dsi.valid ())	1316	if (dsi.valid ())
1146	c->send_auth_request (dsi, true);	1317	c->send_auth_request (dsi, true);
		1318	else
		1319	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si);
1147	}	1322	}
		1323	else
		1324	slog (L_WARN,
		1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1326	p->id);
1148	}	1327	}
1149		1328
1150	break;	1329	break;
1151		1330
1152	default:	1331	default:
1153	send_reset (rsi);	1332	send_reset (rsi);
1154	break;	1333	break;
1155	}	1334	}
1156	}	1335	}
1157		1336
1158	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1159	{	1339	{
1160	if (NOW >= last_activity + ::conf.keepalive + 30)	1340	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1341
		1342	if (when >= 0)
		1343	w.start (when);
		1344	else if (when < -15)
1161	{	1345	{
1162	reset_connection ();	1346	reset_connection ("keepalive overdue");
1163	establish_connection ();	1347	establish_connection ();
1164	}	1348	}
1165	else if (NOW < last_activity + ::conf.keepalive)
1166	w.start (last_activity + ::conf.keepalive);
1167	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1168	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1169	{	1351	{
		1352	w.start (3);
1170	send_ping (si);	1353	send_ping (si);
1171	w.start (NOW + 5);
1172	}	1354	}
1173	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1174	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1175	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1176	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1177	else	1359	else
1178	reset_connection ();	1360	reset_connection ("keepalive timeout");
1179	}	1361	}
1180		1362
		1363	void
1181	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1182	{	1365	{
1183	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1366	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1184		1367
1185	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1368	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1369	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1370	THISNODE->protocols);
1186	p->hmac_set (octx);	1371	p->hmac_set (octx);
1187	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1188		1373
1189	delete p;	1374	delete p;
1190	}	1375	}
1191		1376
1192	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1193	{	1379	{
1194	vpn->script_if_up ();
1195
1196	char *env;	1380	char *env;
		1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1385	conf->id & 0xff); putenv (env);
		1386	}
		1387
		1388	void
		1389	connection::script_init_connect_env ()
		1390	{
		1391	vpn->script_init_env ();
		1392
		1393	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1394	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1395	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1399	}
1202		1400
		1401	inline const char *
1203	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1204	{	1403	{
1205	script_node ();	1404	script_init_connect_env ();
1206		1405
1207	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1208		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1209	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1210	}
1211		1413
		1414	return filename;
		1415	}
		1416
		1417	inline const char *
		1418	connection::script_node_change ()
		1419	{
		1420	script_init_connect_env ();
		1421
		1422	putenv ((char *)"STATE=change");
		1423
		1424	char *filename;
		1425	asprintf (&filename,
		1426	"%s/%s",
		1427	confbase,
		1428	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1429
		1430	return filename;
		1431	}
		1432
		1433	inline const char *
1212	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1213	{	1435	{
1214	script_node ();	1436	script_init_connect_env ();
1215		1437
1216	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1217		1439
1218	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
		1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1445
		1446	return filename;
1219	}	1447	}
1220		1448
1221	connection::connection (struct vpn vpn, conf_node conf)	1449	connection::connection (struct vpn vpn, conf_node conf)
1222	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1223	, rekey (this, &connection::rekey_cb)
1224	, keepalive (this, &connection::keepalive_cb)
1225	, establish_connection (this, &connection::establish_connection_cb)
1226	#if ENABLE_DNS	1451	#if ENABLE_DNS
1227	, dnsv4_tw (this, &connection::dnsv4_cb)	1452	dns (0),
1228	, dns_rcvdq (0), dns_snddq (0)
1229	, dns_rcvseq (0), dns_sndseq (0)
1230	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1231	{	1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
		1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1460
		1461	last_establish_attempt = 0.;
1232	octx = ictx = 0;	1462	octx = ictx = 0;
1233	retry_cnt = 0;
1234		1463
1235	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1236	conf->protocols = PROT_UDPv4;
1237		1465
1238	connectmode = conf_node::C_ALWAYS; // initial setting	1466	// queue a dummy packet to force an initial connection attempt
		1467	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1468	vpn_queue.put (new net_packet);
		1469
1239	reset_connection ();	1470	reset_connection ("startup");
1240	}	1471	}
1241		1472
1242	connection::~connection ()	1473	connection::~connection ()
1243	{	1474	{
1244	shutdown ();	1475	shutdown ();
1245	}	1476	}
1246		1477
		1478	void
1247	void connection_init ()	1479	connection_init ()
1248	{	1480	{
1249	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1250	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1251	}	1483	}
1252		1484

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Comparing gvpe/src/connection.C (file contents): Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs. Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC