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Comparing gvpe/src/connection.C (file contents):
Revision 1.58 by pcg, Sat Jul 9 02:35:42 2005 UTC vs.
Revision 1.112 by root, Fri Sep 12 10:40:43 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		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>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) require (exp)
		49	#endif
30		50
31	#include "conf.h"	51	#include "conf.h"
32	#include "slog.h"	52	#include "slog.h"
33	#include "device.h"	53	#include "device.h"
34	#include "vpn.h"	54	#include "vpn.h"
35	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
36		57
37	#include "netcompat.h"	58	#include "netcompat.h"
38		59
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		61
45	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
46	#define HLOG 15	63	#define HLOG 15
47	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
50		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
51	struct crypto_ctx	112	struct crypto_ctx
52	{	113	{
53	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	115	HMAC_CTX hctx;
55		116
56	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);
57	~crypto_ctx ();	118	~crypto_ctx ();
58	};	119	};
59		120
60	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)
61	{	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
62	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
63	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));
64	HMAC_CTX_init (&hctx);	153	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	154	}
67		155
68	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
69	{	157	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
72	}	160	}
73		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
74	static void	189	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	191	{
77	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	196	}
86		197
87	struct rsa_entry {	198	void
88	tstamp expire;	199	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	200	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	202	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	203	// request data
102	{	204	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		206
105	erase (i);	207	// eventual response data
106	return true;	208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	209	}
109		210
110	if (cleaner.at < NOW)	211	// every use prolongs the expiry
111	cleaner.start (NOW + RSA_TTL);	212	auth_expire = ev_now () + AUTH_TTL;
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = NOW + RSA_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (cleaner.at < NOW)
130	cleaner.start (NOW + RSA_TTL);
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{ }
136
137	} rsa_cache;
138
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{
143	w.start (NOW + RSA_TTL);
144
145	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)
147	i = erase (i);
148	else
149	++i;
150	}
151	}	213	}
152		214
153	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
154		216
155	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)
156	{	219	{
157	if (queue[i])	220	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		221
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	222	i = 0;
185	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	226	}
187		227
188	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
189	{	229	{
190	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
191	delete queue[i];	233	delete [] queue;
192	}	234	}
193		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
194	struct net_rateinfo {	292	struct net_rateinfo
		293	{
195	u32 host;	294	u32 host;
196	double pcnt, diff;	295	double pcnt, diff;
197	tstamp last;	296	tstamp last;
198	};	297	};
199		298
…		…
209		308
210	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	310	bool can (u32 host);
212	};	311	};
213		312
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		314
		315	bool
216	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
217	{	317	{
218	iterator i;	318	iterator i;
219		319
220	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
221	if (i->host == host)	321	if (i->host == host)
222	break;	322	break;
223	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	324	i = erase (i);
225	else	325	else
226	i++;	326	i++;
227		327
228	if (i == end ())	328	if (i == end ())
…		…
230	net_rateinfo ri;	330	net_rateinfo ri;
231		331
232	ri.host = host;	332	ri.host = host;
233	ri.pcnt = 1.;	333	ri.pcnt = 1.;
234	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	335	ri.last = ev_now ();
236		336
237	push_front (ri);	337	push_front (ri);
238		338
239	return true;	339	return true;
240	}	340	}
…		…
242	{	342	{
243	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
244	erase (i);	344	erase (i);
245		345
246	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		348
249	ri.last = NOW;	349	ri.last = ev_now ();
250		350
251	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
252		352
253	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
254		354
…		…
266	}	366	}
267	}	367	}
268		368
269	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
270		370
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	373	{
275	unsigned int xlen;
276
277	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
278		375
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
281	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	379	}
284		380
285	void	381	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	383	{
288	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		385	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	387	}
292		388
293	bool	389	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	391	{
296	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		393	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
299	}	395	}
300		396
		397	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	399	{
303	type = type_;	400	type = type_;
304		401
305	int src = THISNODE->id;	402	int src = THISNODE->id;
306		403
…		…
311		408
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		411
315	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
316	{	421	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	423	}
		424	};
328		425
329	void	426	void
330	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)
331	{	428	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
334	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
335		432
336	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
338		435
339	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
340	{	437	{
341	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
342		439
343	if (cl)	440	if (cl)
344	{	441	{
…		…
350	d[1] = cl;	447	d[1] = cl;
351	}	448	}
352	}	449	}
353	#endif	450	#endif
354		451
355	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
356		453
357	struct {	454	struct {
358	#if RAND_SIZE	455	#if RAND_SIZE
359	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
360	#endif	457	#endif
361	u32 seqno;	458	u32 seqno;
362	} datahdr;	459	} datahdr;
363		460
364	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
365	#if RAND_SIZE	462	#if RAND_SIZE
366	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);
367	#endif	466	#endif
368		467
369	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
370	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
371	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
393	int outl = 0, outl2;	492	int outl = 0, outl2;
394	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
395	u8 *d;	494	u8 *d;
396	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
397		496
398	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
399		498
400	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
401	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
402		501
403	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
404	d = cdata;	503	d = cdata;
405	else	504	else
406	#endif	505	#endif
407	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
408		507
409	/* 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
410	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
411	d, &outl2,	516	d, &outl2,
412	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
413	outl += outl2;	518	outl += outl2;
414		519
…		…
445	}	550	}
446	};	551	};
447		552
448	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
449	{	554	{
450	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
451	// field comes before this data, so peers with other
452	// hmacs simply will not work.
453	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
454	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
455	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
456		559
457	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
458	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
459		562
460	static u8 get_features ()	563	static u8 get_features ()
461	{	564	{
462	u8 f = 0;	565	u8 f = 0;
463	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
464	f |= FEATURE_COMPRESSION;	567	f |= FEATURE_COMPRESSION;
465	#endif	568	#endif
466	#if ENABLE_ROHC	569	#if ENABLE_ROHC
467	f |= FEATURE_ROHC;	570	f |= FEATURE_ROHC;
468	#endif	571	#endif
		572	#if ENABLE_BRIDGING
		573	f |= FEATURE_BRIDGING;
		574	#endif
469	return f;	575	return f;
470	}	576	}
471	};	577	};
472		578
		579	void
473	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
474	{	581	{
475	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
476	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
477	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
478	hmaclen = HMACLENGTH;
479	flags = 0;	585	flags = 0;
480	challengelen = sizeof (rsachallenge);
481	features = get_features ();	586	features = get_features ();
482		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
483	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
484	digest_nid = htonl (EVP_MD_type (RSA_HASH));
485	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 ()));
486		593
487	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
488	set_hdr (type, dst);	595	set_hdr (type, dst);
489	}	596	}
490		597
491	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
492	{	600	{
493	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
494	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);
495	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
496	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)"),
497	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
498	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
499	else if (challengelen != sizeof (rsachallenge))
500	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
501	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
502	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)"),
503	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
504	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
505	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
506	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 ()));
507	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)
508	return true;	624	return true;
		625	}
509		626
510	return false;	627	return false;
511	}	628	}
512		629
513	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
514	{	631	{
515	char magic[8];	632	char magic[8];
516	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
517	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
518	u8 pad2, pad3;	635	u8 pad2, pad3;
519	rsaid id;	636	auth_encr encr;
520	rsaencrdata encr;
521		637
522	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
523	{	639	{
524	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
525	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
526	initiate = !!initiate_;	642	initiate = !!initiate_;
527	protocols = protocols_;	643	protocols = protocols_;
528		644
529	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
530	}	646	}
531	};	647	};
532		648
533	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
534	{	650	{
535	rsaid id;
536	u8 pad1, pad2, pad3;
537	u8 response_len; // encrypted length
538	rsaresponse response;	651	auth_response response;
539		652
540	auth_res_packet (int dst)	653	auth_res_packet (int dst)
541	{	654	{
542	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
543		656
544	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
545	}	658	}
546	};	659	};
547		660
…		…
577	};	690	};
578		691
579	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
580		693
581	void	694	void
582	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
583	{	696	{
584	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."));
585	{	713	}
586	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);
587		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
588	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
589	rekey.start (NOW + ::conf.rekey	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
590	+ (conf->id > THISNODE->id ? 10 : 0));	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
591	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
592		730
593	// send queued packets	731	// send queued packets
594	if (ictx && octx)
595	{
596	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
597	{	733	{
598	send_data_packet (p);	734	if (p->len) send_data_packet (p);
599	delete p;	735	delete p;
600	}	736	}
601		737
602	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
603	{	739	{
604	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
605	delete p;	741	delete p;
606	}
607	}
608	}	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 ());
609	else	752	else
610	{	753	{
611	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	establish_connection.start (NOW + 5);	755	protocol = 0;
613	keepalive.stop ();
614	rekey.stop ();
615	}	756	}
616	}
617
618	void
619	connection::reset_si ()
620	{
621	protocol = best_protocol (THISNODE->protocols & conf->protocols);
622
623	// mask out protocols we cannot establish
624	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
625	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
626	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
627		757
628	si.set (conf, protocol);	758	si.set (conf, protocol);
629	}	759	}
630		760
631	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
632	const sockinfo &	762	const sockinfo &
633	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
634	{	764	{
635	if (!si.valid ())	765	if (!si.valid ())
636	{	766	{
637	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
638		768
639	if (r)	769	if (r)
640	{	770	{
641	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
642	conf->nodename, r->conf->nodename, (const char *)r->si);	772	conf->nodename, r->conf->nodename);
643	return r->si;	773	return r->si;
644	}	774	}
645	else	775	else
646	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
647	conf->nodename);	777	conf->nodename);
648	}	778	}
649		779
650	return si;	780	return si;
651	}	781	}
652		782
653	void	783	void
654	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)
655	{	785	{
656	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
657	reset_connection ();	787	reset_connection ("packet send error");
658	}	788	}
659		789
660	void	790	void
661	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
662	{	792	{
663	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
664		794
665	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);
666	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
667		799
668	delete pkt;	800	delete pkt;
669	}	801	}
670		802
…		…
685	void	817	void
686	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
687	{	819	{
688	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);
689		821
690	rsachallenge chg;	822	generate_auth_data ();
691	rsa_cache.gen (pkt->id, chg);
692	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
693		824
694	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);
695
696	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
697		827
698	delete pkt;	828	delete pkt;
699	}	829	}
700		830
701	void	831	void
702	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
703	{	833	{
704	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
705		835
706	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);
707		838
708	rsa_hash (id, chg, pkt->response);
709
710	pkt->hmac_set (octx);
711
712	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);
713
714	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
715		841
716	delete pkt;	842	delete pkt;
717	}	843	}
718		844
719	void	845	void
720	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
721	{	847	{
722	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
723	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
724		851
725	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);
726		853
727	r->hmac_set (octx);	854	r->hmac_set (octx);
728	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
729		856
730	delete r;	857	delete r;
731	}	858	}
732		859
733	void	860	inline void
734	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
735	{	862	{
736	if (!ictx	863	if (!(ictx && octx)
737	&& conf != THISNODE	864	&& conf != THISNODE
738	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
739	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
740	&& NOW > w.at)	867	&& !w.is_active ())
741	{	868	{
742	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		870	// and stop trying. should probably be handled by a per-connection expire handler.
		871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
		874	return;
		875	}
743		876
744	double retry_int = double (retry_cnt & 3	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
745	? (retry_cnt & 3) + 1	880	? (retry_cnt & 3) + 1
746	: 1 << (retry_cnt >> 2));	881	: 1 << (retry_cnt >> 2));
747		882
748	reset_si ();	883	reset_si ();
749		884
750	bool slow = si.prot & PROT_SLOW;	885	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
751		886
752	if (si.prot && !si.host)	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);
753	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
754	else	893	else
755	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
756	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
757		900
758	slow = slow || (dsi.prot & PROT_SLOW);	901	slow = slow || (dsi.prot & PROT_SLOW);
759		902
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	904	{
762	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))
763	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
764	else	910	else
765	send_ping (dsi, 0);	911	send_ping (dsi, 0);
766	}	912	}
767	}	913	}
768		914
769	retry_int *= slow ? 8. : 0.7;	915	retry_int *= slow ? 4. : 0.9;
770		916
771	if (retry_int < conf->max_retry)	917	if (retry_int < conf->max_retry)
772	retry_cnt++;	918	retry_cnt++;
773	else	919	else
774	retry_int = conf->max_retry;	920	retry_int = conf->max_retry;
775		921
776	w.start (NOW + retry_int);	922	w.start (retry_int);
777	}	923	}
778	}	924	}
779		925
780	void	926	void
781	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
782	{	928	{
783	if (ictx && octx)	929	if (ictx && octx)
784	{	930	{
785	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
786	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
787		933
788	if (::conf.script_node_down)	934	if (::conf.script_node_down)
789	if (!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);
790	slog (L_WARN, _("node-down command execution failed, continuing."));	938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
791	}	940	}
792		941
793	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
794	delete octx; octx = 0;	943	delete octx; octx = 0;
795	#if ENABLE_DNS
796	dnsv4_reset_connection ();
797	#endif
798		944
799	si.host = 0;	945	si.host = 0;
800		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
801	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
802	retry_cnt = 0;	953	retry_cnt = 0;
803		954
804	rekey.stop ();	955	rekey.stop ();
805	keepalive.stop ();	956	keepalive.stop ();
806	establish_connection.stop ();	957	establish_connection.stop ();
…		…
810	connection::shutdown ()	961	connection::shutdown ()
811	{	962	{
812	if (ictx && octx)	963	if (ictx && octx)
813	send_reset (si);	964	send_reset (si);
814		965
815	reset_connection ();	966	reset_connection ("shutdown");
816	}	967	}
817		968
818	void	969	// poor-man's rekeying
819	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
820	{	972	{
821	reset_connection ();	973	reset_connection ("rekeying");
822	establish_connection ();	974	establish_connection ();
823	}	975	}
824		976
825	void	977	void
826	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
840	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
841	rekey ();	993	rekey ();
842	}	994	}
843		995
844	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
845	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
846	{	1008	{
847	if (ictx && octx)	1009	if (ictx && octx)
848	send_data_packet (pkt);	1010	send_data_packet (pkt);
849	else	1011	else
850	{	1012	{
851	if (!broadcast)
852	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
853		1014	post_inject_queue ();
854	establish_connection ();
855	}	1015	}
856	}	1016	}
857		1017
		1018	void
858	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
859	{	1020	{
860	if (ictx && octx)	1021	if (ictx && octx)
861	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
862	else	1023	else
863	{	1024	{
864	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
865		1026	post_inject_queue ();
866	establish_connection ();
867	}	1027	}
868	}	1028	}
869		1029
870	void	1030	void
871	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
872	{	1032	{
873	last_activity = NOW;	1033	last_activity = ev_now ();
874		1034
875	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.",
876	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;
877		1040
878	switch (pkt->typ ())	1041	switch (pkt->typ ())
879	{	1042	{
880	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
881	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
882	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
883	// when we receive a ping.	1048	// when we receive a ping.
884	if (!ictx)	1049	if (!ictx)
885	{	1050	{
886	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
887	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
888	}	1053	}
889	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.
890	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
891		1058
892	break;	1059	break;
893		1060
894	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 ();
895	break;	1067	break;
896		1068
897	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)
898	{	1073	{
899	reset_connection ();	1074	reset_connection ("remote reset");
900		1075
901	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
902		1077
903	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
904	{
905	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
906	conf->nodename, (const char *)rsi);
907	connectmode = conf_node::C_DISABLED;
908	}
909	else if (connectmode == conf_node::C_ALWAYS)
910	establish_connection ();	1079	establish_connection ();
911	}	1080	}
		1081
912	break;	1082	break;
913		1083
914	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
915	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
916	{	1086	{
917	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
918		1088
919	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);
920		1092
921	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))
922	{	1099	{
923	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
924	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."),
925	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
926	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
927		1104
928	if (p->initiate)	1105	if (p->initiate)
		1106	{
929	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
930		1108
931	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
932		1112
		1113	auth_data auth;
		1114
933	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
934	{	1116	{
935	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?"),
936	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));
937	break;
938	}	1119	}
939	else	1120	else
940	{	1121	{
941	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
942		1123
943	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
944	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
945		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
946	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
948		1133
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1134	connection_established (rsi);
952
953	break;	1135	}
954	}	1136	}
		1137
		1138	break;
955	}	1139	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1140
960	send_reset (rsi);	1141	send_reset (rsi);
961	}	1142	}
962		1143
963	break;	1144	break;
964		1145
965	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
966	{	1147	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
968		1149
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1151
971	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))
972	{	1156	{
973	if (p->prot_minor != PROTOCOL_MINOR)
974	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
975	conf->nodename, (const char *)rsi,
976	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
977
978	rsachallenge chg;
979
980	if (!rsa_cache.find (p->id, chg))
981	{
982	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
984	break;
985	}	1159	}
986	else	1160	else if (!have_snd_auth)
987	{	1161	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
989		1163
990	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
991	{
992	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
993	"could be an attack, or just corruption or a synchronization error"),
994	conf->nodename, (const char *)rsi);
995	break;
996	}
997	else
998	{
999	rsaresponse h;
1000
1001	rsa_hash (p->id, chg, h);
1002
1003	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1004	{
1005	prot_minor = p->prot_minor;
1006
1007	delete ictx; ictx = cctx;
1008
1009	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1010
1011	si = rsi;
1012	protocol = rsi.prot;
1013
1014	connection_established ();	1165	connection_established (rsi);
1015
1016	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1017	conf->nodename, (const char *)rsi,
1018	p->prot_major, p->prot_minor);
1019
1020	if (::conf.script_node_up)
1021	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1022	slog (L_WARN, _("node-up command execution failed, continuing."));
1023
1024	break;
1025	}
1026	else
1027	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1028	conf->nodename, (const char *)rsi);
1029	}
1030
1031	delete cctx;
1032	}
1033	}	1166	}
1034	}	1167	}
1035
1036	send_reset (rsi);
1037	break;	1168	break;
1038		1169
1039	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1040	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1041	send_reset (rsi);	1172	send_reset (rsi);
…		…
1047	if (ictx && octx)	1178	if (ictx && octx)
1048	{	1179	{
1049	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1050		1181
1051	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	{
1052	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"
1053	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1054	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1055	else	1203	else
1056	{	1204	{
1057	u32 seqno;	1205	u32 seqno;
1058	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1059		1208
1060	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1061	{	1212	{
1062	vpn->tap->send (d);	1213	vpn->tap->send (d);
1063		1214
1064	if (si != rsi)	1215	if (si != rsi)
1065	{	1216	{
1066	// fast re-sync on source address 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.)
1067	si = rsi;	1219	// {
1068
1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1070	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);
1071	}	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);
1072	}	1249	}
1073		1250
1074	delete d;	1251	delete d;
1075	break;	1252	break;
1076	}	1253	}
…		…
1080	break;	1257	break;
1081		1258
1082	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1084	{	1261	{
1085	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1086		1263
1087	if (p->id > 0 && p->id <= vpn->conns.size ())	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1088	{	1265	{
1089	connection *c = vpn->conns[p->id - 1];	1266	connection *c = vpn->conns[p->id - 1];
1090	conf->protocols = p->protocols;	1267	conf->protocols = p->protocols;
1091		1268
1092	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	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,
1093	conf->id, p->id, c->ictx && c->octx);	1272	c->ictx && c->octx);
1094		1273
1095	if (c->ictx && c->octx)	1274	if (c->ictx && c->octx)
1096	{	1275	{
1097	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1098	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
…		…
1121		1300
1122	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1123	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));
1124	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1125		1304
1126	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]",
1127	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);
1128		1313
1129	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1130		1315
1131	if (dsi.valid ())	1316	if (dsi.valid ())
1132	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);
1133	}	1322	}
1134	else	1323	else
1135	slog (L_WARN,	1324	slog (L_WARN,
1136	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137	p->id);	1326	p->id);
…		…
1143	send_reset (rsi);	1332	send_reset (rsi);
1144	break;	1333	break;
1145	}	1334	}
1146	}	1335	}
1147		1336
1148	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1149	{	1339	{
1150	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)
1151	{	1345	{
1152	reset_connection ();	1346	reset_connection ("keepalive overdue");
1153	establish_connection ();	1347	establish_connection ();
1154	}	1348	}
1155	else if (NOW < last_activity + ::conf.keepalive)
1156	w.start (last_activity + ::conf.keepalive);
1157	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1158	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1159	{	1351	{
		1352	w.start (3);
1160	send_ping (si);	1353	send_ping (si);
1161	w.start (NOW + 5);
1162	}	1354	}
1163	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1164	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1165	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1166	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1167	else	1359	else
1168	reset_connection ();	1360	reset_connection ("keepalive timeout");
1169	}	1361	}
1170		1362
		1363	void
1171	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1172	{	1365	{
1173	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);
1174		1367
1175	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);
1176	p->hmac_set (octx);	1371	p->hmac_set (octx);
1177	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1178		1373
1179	delete p;	1374	delete p;
1180	}	1375	}
1181		1376
		1377	void
1182	void connection::script_init_env (const char *ext)	1378	connection::script_init_env (const char *ext)
1183	{	1379	{
1184	char *env;	1380	char *env;
1185	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1186	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189	conf->id & 0xff); putenv (env);	1385	conf->id & 0xff); putenv (env);
1190	}	1386	}
1191		1387
		1388	void
1192	void connection::script_init_connect_env ()	1389	connection::script_init_connect_env ()
1193	{	1390	{
1194	vpn->script_init_env ();	1391	vpn->script_init_env ();
1195		1392
1196	char *env;	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_init_connect_env ();	1404	script_init_connect_env ();
1206		1405
1207	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1208		1407
1209	char *filename;	1408	char *filename;
1210	asprintf (&filename,	1409	asprintf (&filename,
1211	"%s/%s",	1410	"%s/%s",
1212	confbase,	1411	confbase,
1213	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1214		1413
1215	return filename;	1414	return filename;
1216	}	1415	}
1217		1416
1218	const char *connection::script_node_down ()	1417	inline const char *
		1418	connection::script_node_change ()
1219	{	1419	{
1220	script_init_connect_env ();	1420	script_init_connect_env ();
1221		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 *
		1434	connection::script_node_down ()
		1435	{
		1436	script_init_connect_env ();
		1437
1222	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1223		1439
1224	char *filename;	1440	char *filename;
1225	asprintf (&filename,	1441	asprintf (&filename,
1226	"%s/%s",	1442	"%s/%s",
1227	confbase,	1443	confbase,
…		…
1229		1445
1230	return filename;	1446	return filename;
1231	}	1447	}
1232		1448
1233	connection::connection (struct vpn *vpn, conf_node *conf)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1234	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1235	, rekey (this, &connection::rekey_cb)
1236	, keepalive (this, &connection::keepalive_cb)
1237	, establish_connection (this, &connection::establish_connection_cb)
1238	#if ENABLE_DNS	1451	#if ENABLE_DNS
1239	, dns (0)	1452	dns (0),
1240	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1241	{	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.;
1242	octx = ictx = 0;	1462	octx = ictx = 0;
1243	retry_cnt = 0;
1244		1463
1245	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1246	conf->protocols = PROT_UDPv4;
1247		1465
1248	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
1249	reset_connection ();	1470	reset_connection ("startup");
1250	}	1471	}
1251		1472
1252	connection::~connection ()	1473	connection::~connection ()
1253	{	1474	{
1254	shutdown ();	1475	shutdown ();
1255	}	1476	}
1256		1477
		1478	void
1257	void connection_init ()	1479	connection_init ()
1258	{	1480	{
1259	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1260	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1261	}	1483	}
1262		1484

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