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Comparing gvpe/src/connection.C (file contents):
Revision 1.59 by pcg, Mon Dec 5 12:58:09 2005 UTC vs.
Revision 1.104 by root, Fri Jul 19 18:18:27 2013 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
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
…		…
31	#include "conf.h"	43	#include "conf.h"
32	#include "slog.h"	44	#include "slog.h"
33	#include "device.h"	45	#include "device.h"
34	#include "vpn.h"	46	#include "vpn.h"
35	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
36		49
37	#include "netcompat.h"	50	#include "netcompat.h"
38		51
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	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
44		54
45	#define ULTRA_FAST 1	55	#define ULTRA_FAST 1
46	#define HLOG 15	56	#define HLOG 15
47	#include "lzf/lzf.h"	57	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	58	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	59	#include "lzf/lzf_d.c"
50		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb *cb, const char *warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
		104
51	struct crypto_ctx	105	struct crypto_ctx
52	{	106	{
53	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	108	HMAC_CTX hctx;
55		109
56	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	111	~crypto_ctx ();
58	};	112	};
59		113
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
62	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	146	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	147	}
67		148
68	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
69	{	150	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
72	}	153	}
73		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
74	static void	182	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	184	{
77	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
78		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response 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	}	189	}
86		190
87	struct rsa_entry {	191	void
88	tstamp expire;	192	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	193	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	195	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	196	// request data
102	{	197	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		199
105	erase (i);	200	// eventual response data
106	return true;	201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	202	}
109		203
110	if (cleaner.at < NOW)	204	// every use prolongs the expiry
111	cleaner.start (NOW + RSA_TTL);	205	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	}	206	}
152		207
153	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
154		209
155	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
156	{	212	{
157	if (queue[i])	213	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		214
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;	215	i = 0;
185	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	219	}
187		220
188	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
189	{	222	{
190	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
191	delete queue[i];	226	delete [] queue;
192	}	227	}
193		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
194	struct net_rateinfo {	285	struct net_rateinfo
		286	{
195	u32 host;	287	u32 host;
196	double pcnt, diff;	288	double pcnt, diff;
197	tstamp last;	289	tstamp last;
198	};	290	};
199		291
…		…
209		301
210	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	303	bool can (u32 host);
212	};	304	};
213		305
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		307
		308	bool
216	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
217	{	310	{
218	iterator i;	311	iterator i;
219		312
220	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
221	if (i->host == host)	314	if (i->host == host)
222	break;	315	break;
223	else if (i->last < NOW - NRL_EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	317	i = erase (i);
225	else	318	else
226	i++;	319	i++;
227		320
228	if (i == end ())	321	if (i == end ())
…		…
230	net_rateinfo ri;	323	net_rateinfo ri;
231		324
232	ri.host = host;	325	ri.host = host;
233	ri.pcnt = 1.;	326	ri.pcnt = 1.;
234	ri.diff = NRL_MAXDIF;	327	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	328	ri.last = ev_now ();
236		329
237	push_front (ri);	330	push_front (ri);
238		331
239	return true;	332	return true;
240	}	333	}
…		…
242	{	335	{
243	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
244	erase (i);	337	erase (i);
245		338
246	ri.pcnt = ri.pcnt * NRL_ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		341
249	ri.last = NOW;	342	ri.last = ev_now ();
250		343
251	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
252		345
253	bool send = dif > NRL_CUTOFF;	346	bool send = dif > NRL_CUTOFF;
254		347
…		…
266	}	359	}
267	}	360	}
268		361
269	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
270		363
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	366	{
275	unsigned int xlen;
276
277	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
278		368
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
281	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	372	}
284		373
285	void	374	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	376	{
288	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		378	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	380	}
292		381
293	bool	382	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	384	{
296	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		386	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
299	}	388	}
300		389
		390	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	392	{
303	type = type_;	393	type = type_;
304		394
305	int src = THISNODE->id;	395	int src = THISNODE->id;
306		396
…		…
311		401
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		404
315	struct vpndata_packet : vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		410	tap_packet *unpack (connection *conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
316	{	414	{
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;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	416	}
		417	};
328		418
329	void	419	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	421	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
334	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
335		425
336	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
338		428
339	if (conn->features & ENABLE_COMPRESSION)	429	if (conn->features & FEATURE_COMPRESSION)
340	{	430	{
341	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
342		432
343	if (cl)	433	if (cl)
344	{	434	{
…		…
350	d[1] = cl;	440	d[1] = cl;
351	}	441	}
352	}	442	}
353	#endif	443	#endif
354		444
355	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
356		446
357	struct {	447	struct {
358	#if RAND_SIZE	448	#if RAND_SIZE
359	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
360	#endif	450	#endif
361	u32 seqno;	451	u32 seqno;
362	} datahdr;	452	} datahdr;
363		453
364	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
365	#if RAND_SIZE	455	#if RAND_SIZE
366	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
367	#endif	459	#endif
368		460
369	require (EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
370	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
371	(unsigned char *) &datahdr, DATAHDR));	463	(unsigned char *) &datahdr, DATAHDR));
…		…
393	int outl = 0, outl2;	485	int outl = 0, outl2;
394	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
395	u8 *d;	487	u8 *d;
396	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
397		489
398	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
399		491
400	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
401	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
402		494
403	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
404	d = cdata;	496	d = cdata;
405	else	497	else
406	#endif	498	#endif
407	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
408		500
409	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
410	require (EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
411	d, &outl2,	509	d, &outl2,
412	(unsigned char *)&data, len - data_hdr_size ()));	510	(unsigned char *)&data, len - data_hdr_size ()));
413	outl += outl2;	511	outl += outl2;
414		512
…		…
445	}	543	}
446	};	544	};
447		545
448	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
449	{	547	{
450	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
454	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
455	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
456		552
457	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
458	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
459		555
460	static u8 get_features ()	556	static u8 get_features ()
461	{	557	{
462	u8 f = 0;	558	u8 f = 0;
463	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
…		…
471	#endif	567	#endif
472	return f;	568	return f;
473	}	569	}
474	};	570	};
475		571
		572	void
476	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
477	{	574	{
478	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
479	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
480	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
481	hmaclen = HMACLENGTH;
482	flags = 0;	578	flags = 0;
483	challengelen = sizeof (rsachallenge);
484	features = get_features ();	579	features = get_features ();
485		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
486	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
487	digest_nid = htonl (EVP_MD_type (RSA_HASH));
488	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
489		586
490	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
491	set_hdr (type, dst);	588	set_hdr (type, dst);
492	}	589	}
493		590
494	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
495	{	593	{
496	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
497	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
498	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
499	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
500	else if (hmaclen != HMACLENGTH)	599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
501	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
502	else if (challengelen != sizeof (rsachallenge))
503	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
504	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
505	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
506	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
507	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
508	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
509	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
510	else	609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
511	return true;	617	return true;
		618	}
512		619
513	return false;	620	return false;
514	}	621	}
515		622
516	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
517	{	624	{
518	char magic[8];	625	char magic[8];
519	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
520	u8 protocols; // supported protocols (will be patched on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
521	u8 pad2, pad3;	628	u8 pad2, pad3;
522	rsaid id;	629	auth_encr encr;
523	rsaencrdata encr;
524		630
525	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
526	{	632	{
527	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
528	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
529	initiate = !!initiate_;	635	initiate = !!initiate_;
530	protocols = protocols_;	636	protocols = protocols_;
531		637
532	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
533	}	639	}
534	};	640	};
535		641
536	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
537	{	643	{
538	rsaid id;
539	u8 pad1, pad2, pad3;
540	u8 response_len; // encrypted length
541	rsaresponse response;	644	auth_response response;
542		645
543	auth_res_packet (int dst)	646	auth_res_packet (int dst)
544	{	647	{
545	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
546		649
547	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
548	}	651	}
549	};	652	};
550		653
…		…
580	};	683	};
581		684
582	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
583		686
584	void	687	void
585	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
586	{	689	{
		690	if (!have_snd_auth || !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
587	if (ictx && octx)	723	if (ictx && octx)
588	{	724	{
589	connectmode = conf->connectmode;	725	while (tap_packet *p = (tap_packet *)data_queue.get ())
590
591	// make sure rekeying timeouts are slightly asymmetric
592	rekey.start (NOW + ::conf.rekey
593	+ (conf->id > THISNODE->id ? 10 : 0));
594	keepalive.start (NOW + ::conf.keepalive);
595
596	// send queued packets
597	if (ictx && octx)
598	{	726	{
599	while (tap_packet *p = (tap_packet *)data_queue.get ())
600	{
601	send_data_packet (p);	727	if (p->len) send_data_packet (p);
602	delete p;	728	delete p;
603	}
604
605	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
606	{
607	send_vpn_packet (p, si, IPTOS_RELIABILITY);
608	delete p;
609	}
610	}	729	}
		730
		731	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
611	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
612	else	746	else
613	{	747	{
614	retry_cnt = 0;
615	establish_connection.start (NOW + 5);
616	keepalive.stop ();
617	rekey.stop ();
618	}
619	}
620
621	void
622	connection::reset_si ()
623	{
624	protocol = best_protocol (THISNODE->protocols & conf->protocols);
625
626	// mask out protocols we cannot establish
627	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
628	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
629	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
630
631	if (protocol
632	&& (!conf->can_direct (THISNODE)
633	|| !THISNODE->can_direct (conf)))
634	{
635	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
636	protocol = 0;	749	protocol = 0;
637	}	750	}
638		751
639	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
640	}	755	}
641		756
642	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
643	const sockinfo &	758	const sockinfo &
644	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
645	{	760	{
646	if (!si.valid ())	761	if (!si.valid ())
647	{	762	{
648	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
649		764
650	if (r)	765	if (r)
651	{	766	{
652	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
653	conf->nodename, r->conf->nodename, (const char *)r->si);	768	conf->nodename, r->conf->nodename);
654	return r->si;	769	return r->si;
655	}	770	}
656	else	771	else
657	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
658	conf->nodename);	773	conf->nodename);
659	}	774	}
660		775
661	return si;	776	return si;
662	}	777	}
…		…
672	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
673	{	788	{
674	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
675		790
676	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
677	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
678		795
679	delete pkt;	796	delete pkt;
680	}	797	}
681		798
…		…
696	void	813	void
697	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
698	{	815	{
699	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
700		817
701	rsachallenge chg;	818	generate_auth_data ();
702	rsa_cache.gen (pkt->id, chg);
703	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
704		820
705	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
706
707	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
708		823
709	delete pkt;	824	delete pkt;
710	}	825	}
711		826
712	void	827	void
713	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
714	{	829	{
715	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
716		831
717	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
718		834
719	rsa_hash (id, chg, pkt->response);
720
721	pkt->hmac_set (octx);
722
723	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
724
725	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
726		837
727	delete pkt;	838	delete pkt;
728	}	839	}
729		840
730	void	841	void
731	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
732	{	843	{
733	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
734	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
735		847
736	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
737		849
738	r->hmac_set (octx);	850	r->hmac_set (octx);
739	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
740		852
741	delete r;	853	delete r;
742	}	854	}
743		855
744	void	856	inline void
745	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
746	{	858	{
747	if (!ictx	859	if (!(ictx && octx)
748	&& conf != THISNODE	860	&& conf != THISNODE
749	&& connectmode != conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
750	&& connectmode != conf_node::C_DISABLED	862	&& connectmode != conf_node::C_DISABLED
751	&& NOW > w.at)	863	&& !w.is_active ())
752	{	864	{
753	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		866	// and stop trying. should probably be handled by a per-connection expire handler.
		867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
		870	return;
		871	}
754		872
755	double retry_int = double (retry_cnt & 3	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
756	? (retry_cnt & 3) + 1	876	? (retry_cnt & 3) + 1
757	: 1 << (retry_cnt >> 2));	877	: 1 << (retry_cnt >> 2));
758		878
759	reset_si ();	879	reset_si ();
760		880
761	bool slow = si.prot & PROT_SLOW;	881	bool slow = si.prot & PROT_SLOW;
762		882
763	if (si.prot && !si.host)	883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/*TODO*/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
764	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
765	else	889	else
766	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
767	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
768		896
769	slow = slow || (dsi.prot & PROT_SLOW);	897	slow = slow || (dsi.prot & PROT_SLOW);
770		898
771	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
…		…
775	else	903	else
776	send_ping (dsi, 0);	904	send_ping (dsi, 0);
777	}	905	}
778	}	906	}
779		907
780	retry_int *= slow ? 8. : 0.7;	908	retry_int *= slow ? 8. : 0.9;
781		909
782	if (retry_int < conf->max_retry)	910	if (retry_int < conf->max_retry)
783	retry_cnt++;	911	retry_cnt++;
784	else	912	else
785	retry_int = conf->max_retry;	913	retry_int = conf->max_retry;
786		914
787	w.start (NOW + retry_int);	915	w.start (retry_int);
788	}	916	}
789	}	917	}
790		918
791	void	919	void
792	connection::reset_connection ()	920	connection::reset_connection ()
…		…
795	{	923	{
796	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
797	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
798		926
799	if (::conf.script_node_down)	927	if (::conf.script_node_down)
800	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
801	slog (L_WARN, _("node-down command execution failed, continuing."));	931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
802	}	933	}
803		934
804	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
805	delete octx; octx = 0;	936	delete octx; octx = 0;
806	#if ENABLE_DNS
807	dnsv4_reset_connection ();
808	#endif
809		937
810	si.host = 0;	938	si.host = 0;
811		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
812	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
813	retry_cnt = 0;	946	retry_cnt = 0;
814		947
815	rekey.stop ();	948	rekey.stop ();
816	keepalive.stop ();	949	keepalive.stop ();
817	establish_connection.stop ();	950	establish_connection.stop ();
…		…
824	send_reset (si);	957	send_reset (si);
825		958
826	reset_connection ();	959	reset_connection ();
827	}	960	}
828		961
829	void	962	// poor-man's rekeying
830	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
831	{	965	{
832	reset_connection ();	966	reset_connection ();
833	establish_connection ();	967	establish_connection ();
834	}	968	}
835		969
…		…
851	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
852	rekey ();	986	rekey ();
853	}	987	}
854		988
855	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
856	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1000	connection::inject_data_packet (tap_packet *pkt)
857	{	1001	{
858	if (ictx && octx)	1002	if (ictx && octx)
859	send_data_packet (pkt);	1003	send_data_packet (pkt);
860	else	1004	else
861	{	1005	{
862	if (!broadcast)
863	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
864		1007	post_inject_queue ();
865	establish_connection ();
866	}	1008	}
867	}	1009	}
868		1010
		1011	void
869	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
870	{	1013	{
871	if (ictx && octx)	1014	if (ictx && octx)
872	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
873	else	1016	else
874	{	1017	{
875	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
876		1019	post_inject_queue ();
877	establish_connection ();
878	}	1020	}
879	}	1021	}
880		1022
881	void	1023	void
882	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
883	{	1025	{
884	last_activity = NOW;	1026	last_activity = ev_now ();
885		1027
886	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
887	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
888		1033
889	switch (pkt->typ ())	1034	switch (pkt->typ ())
890	{	1035	{
891	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
892	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
893	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
894	// when we receive a ping.	1041	// when we receive a ping.
895	if (!ictx)	1042	if (!ictx)
896	{	1043	{
897	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
898	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
899	}	1046	}
900	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
901	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
902		1051
903	break;	1052	break;
904		1053
905	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
906	break;	1060	break;
907		1061
908	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
909	{	1063	{
910	reset_connection ();	1064	reset_connection ();
911		1065
912	config_packet *p = (config_packet *) pkt;	1066	config_packet *p = (config_packet *) pkt;
913		1067
914	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
915	{
916	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
917	conf->nodename, (const char *)rsi);
918	connectmode = conf_node::C_DISABLED;
919	}
920	else if (connectmode == conf_node::C_ALWAYS)
921	establish_connection ();	1069	establish_connection ();
922	}	1070	}
923	break;	1071	break;
924		1072
925	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
926	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
927	{	1075	{
928	auth_req_packet *p = (auth_req_packet *) pkt;	1076	auth_req_packet *p = (auth_req_packet *)pkt;
929		1077
930	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
931		1081
932	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
933	{	1088	{
934	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
935	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
936	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
937	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
938		1093
939	if (p->initiate)	1094	if (p->initiate)
940	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
941		1096
942	rsachallenge k;	1097	auth_data auth;
943		1098
944	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
945	{	1100	{
946	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
947	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
948	break;
949	}	1103	}
950	else	1104	else
951	{	1105	{
952	delete octx;	1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
953		1107
954	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
955	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
956		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
957	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
958	features = p->features & config_packet::get_features ();	1116	features = p->features & config_packet::get_features ();
959		1117
960	send_auth_response (rsi, p->id, k);
961
962	connection_established ();	1118	connection_established (rsi);
963
964	break;	1119	}
965	}	1120	}
		1121
		1122	break;
966	}	1123	}
967	else
968	slog (L_WARN, _("%s(%s): protocol mismatch"),
969	conf->nodename, (const char *)rsi);
970		1124
971	send_reset (rsi);	1125	send_reset (rsi);
972	}	1126	}
973		1127
974	break;	1128	break;
975		1129
976	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
977	{	1131	{
978	auth_res_packet *p = (auth_res_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
979		1133
980	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
981		1135
982	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
983	{	1140	{
984	if (p->prot_minor != PROTOCOL_MINOR)
985	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
986	conf->nodename, (const char *)rsi,
987	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
988
989	rsachallenge chg;
990
991	if (!rsa_cache.find (p->id, chg))
992	{
993	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
994	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
995	break;
996	}
997	else
998	{
999	crypto_ctx *cctx = new crypto_ctx (chg, 0);
1000
1001	if (!p->hmac_chk (cctx))
1002	{
1003	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1004	"could be an attack, or just corruption or a synchronization error"),
1005	conf->nodename, (const char *)rsi);
1006	break;
1007	}
1008	else
1009	{
1010	rsaresponse h;
1011
1012	rsa_hash (p->id, chg, h);
1013
1014	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1015	{
1016	prot_minor = p->prot_minor;
1017
1018	delete ictx; ictx = cctx;
1019
1020	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1021
1022	si = rsi;
1023	protocol = rsi.prot;
1024
1025	connection_established ();
1026
1027	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1028	conf->nodename, (const char *)rsi,
1029	p->prot_major, p->prot_minor);
1030
1031	if (::conf.script_node_up)
1032	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1033	slog (L_WARN, _("node-up command execution failed, continuing."));
1034
1035	break;
1036	}
1037	else
1038	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1039	conf->nodename, (const char *)rsi);
1040	}
1041
1042	delete cctx;
1043	}
1044	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1147
		1148	have_snd_auth = true;
		1149	connection_established (rsi);
		1150	}
		1151
		1152	break;
1045	}	1153	}
1046		1154
1047	send_reset (rsi);	1155	send_reset (rsi);
1048	break;	1156	break;
1049		1157
…		…
1059	{	1167	{
1060	vpndata_packet *p = (vpndata_packet *)pkt;	1168	vpndata_packet *p = (vpndata_packet *)pkt;
1061		1169
1062	if (!p->hmac_chk (ictx))	1170	if (!p->hmac_chk (ictx))
1063	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1171	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1064	"could be an attack, or just corruption or a synchronization error"),	1172	"could be an attack, or just corruption or a synchronization error."),
1065	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
1066	else	1174	else
1067	{	1175	{
1068	u32 seqno;	1176	u32 seqno;
1069	tap_packet *d = p->unpack (this, seqno);	1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
1070		1179
1071	if (iseqno.recv_ok (seqno))	1180	if (seqclass == 0) // ok
1072	{	1181	{
1073	vpn->tap->send (d);	1182	vpn->tap->send (d);
1074		1183
1075	if (si != rsi)	1184	if (si != rsi)
1076	{	1185	{
1077	// fast re-sync on source address changes, useful especially for tcp/ip	1186	// fast re-sync on source address changes, useful especially for tcp/ip
		1187	//if (last_si_change < ev_now () + 5.)
1078	si = rsi;	1188	// {
1079
1080	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1081	conf->nodename, (const char *)si, (const char *)rsi);	1190	conf->nodename, (const char *)si, (const char *)rsi);
		1191
		1192	si = rsi;
		1193
		1194	if (::conf.script_node_change)
		1195	{
		1196	run_script_cb *cb = new run_script_cb;
		1197	cb->set<connection, &connection::script_node_change> (this);
		1198	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1199	}
		1200
		1201	// }
		1202	//else
		1203	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1204	// conf->nodename, (const char *)si, (const char *)rsi);
1082	}	1205	}
		1206	}
		1207	else if (seqclass == 1) // far history
		1208	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1209	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1210	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1211	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 3) // reset
		1214	{
		1215	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1216	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1217	send_reset (rsi);
1083	}	1218	}
1084		1219
1085	delete d;	1220	delete d;
1086	break;	1221	break;
1087	}	1222	}
…		…
1091	break;	1226	break;
1092		1227
1093	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
1094	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1095	{	1230	{
1096	connect_req_packet *p = (connect_req_packet *) pkt;	1231	connect_req_packet *p = (connect_req_packet *)pkt;
1097		1232
1098	if (p->id > 0 && p->id <= vpn->conns.size ())	1233	if (p->id > 0 && p->id <= vpn->conns.size ())
1099	{	1234	{
1100	connection *c = vpn->conns[p->id - 1];	1235	connection *c = vpn->conns[p->id - 1];
1101	conf->protocols = p->protocols;	1236	conf->protocols = p->protocols;
1102		1237
1103	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1238	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1239	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1240	p->protocols,
1104	conf->id, p->id, c->ictx && c->octx);	1241	c->ictx && c->octx);
1105		1242
1106	if (c->ictx && c->octx)	1243	if (c->ictx && c->octx)
1107	{	1244	{
1108	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
1109	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
…		…
1132		1269
1133	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1134	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1271	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1135	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1136		1273
1137	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1274	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1138	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1275	conf->nodename,
		1276	vpn->conns[p->id - 1]->conf->nodename,
		1277	(const char *)p->si,
		1278	p->protocols,
		1279	protocol,
		1280	p->si.supported_protocols (c->conf),
		1281	!c->ictx && !c->octx);
1139		1282
1140	const sockinfo &dsi = forward_si (p->si);	1283	const sockinfo &dsi = forward_si (p->si);
1141		1284
1142	if (dsi.valid ())	1285	if (dsi.valid ())
1143	c->send_auth_request (dsi, true);	1286	c->send_auth_request (dsi, true);
		1287	else
		1288	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si);
1144	}	1291	}
1145	else	1292	else
1146	slog (L_WARN,	1293	slog (L_WARN,
1147	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1148	p->id);	1295	p->id);
…		…
1154	send_reset (rsi);	1301	send_reset (rsi);
1155	break;	1302	break;
1156	}	1303	}
1157	}	1304	}
1158		1305
1159	void connection::keepalive_cb (time_watcher &w)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1160	{	1308	{
1161	if (NOW >= last_activity + ::conf.keepalive + 30)	1309	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1310
		1311	if (when >= 0)
		1312	w.start (when);
		1313	else if (when < -15)
1162	{	1314	{
1163	reset_connection ();	1315	reset_connection ();
1164	establish_connection ();	1316	establish_connection ();
1165	}	1317	}
1166	else if (NOW < last_activity + ::conf.keepalive)
1167	w.start (last_activity + ::conf.keepalive);
1168	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1169	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1170	{	1320	{
		1321	w.start (3);
1171	send_ping (si);	1322	send_ping (si);
1172	w.start (NOW + 5);
1173	}	1323	}
1174	else if (NOW < last_activity + ::conf.keepalive + 10)	1324	else if (when >= -10)
1175	// hold ondemand connections implicitly a few seconds longer	1325	// hold ondemand connections implicitly a few seconds longer
1176	// should delete octx, though, or something like that ;)	1326	// should delete octx, though, or something like that ;)
1177	w.start (last_activity + ::conf.keepalive + 10);	1327	w.start (when + 10);
1178	else	1328	else
1179	reset_connection ();	1329	reset_connection ();
1180	}	1330	}
1181		1331
		1332	void
1182	void connection::send_connect_request (int id)	1333	connection::send_connect_request (int id)
1183	{	1334	{
1184	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1185		1336
1186	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1339	THISNODE->protocols);
1187	p->hmac_set (octx);	1340	p->hmac_set (octx);
1188	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1189		1342
1190	delete p;	1343	delete p;
1191	}	1344	}
1192		1345
		1346	void
1193	void connection::script_init_env (const char *ext)	1347	connection::script_init_env (const char *ext)
1194	{	1348	{
1195	char *env;	1349	char *env;
1196	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1350	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1197	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1351	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1198	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1352	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1199	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1353	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1200	conf->id & 0xff); putenv (env);	1354	conf->id & 0xff); putenv (env);
1201	}	1355	}
1202		1356
		1357	void
1203	void connection::script_init_connect_env ()	1358	connection::script_init_connect_env ()
1204	{	1359	{
1205	vpn->script_init_env ();	1360	vpn->script_init_env ();
1206		1361
1207	char *env;	1362	char *env;
1208	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1363	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1364	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1209	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1210	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1211	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1212	}	1368	}
1213		1369
		1370	inline const char *
1214	const char *connection::script_node_up ()	1371	connection::script_node_up ()
1215	{	1372	{
1216	script_init_connect_env ();	1373	script_init_connect_env ();
1217		1374
1218	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1219		1376
1220	char *filename;	1377	char *filename;
1221	asprintf (&filename,	1378	asprintf (&filename,
1222	"%s/%s",	1379	"%s/%s",
1223	confbase,	1380	confbase,
1224	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1225		1382
1226	return filename;	1383	return filename;
1227	}	1384	}
1228		1385
1229	const char *connection::script_node_down ()	1386	inline const char *
		1387	connection::script_node_change ()
1230	{	1388	{
1231	script_init_connect_env ();	1389	script_init_connect_env ();
1232		1390
		1391	putenv ((char *)"STATE=change");
		1392
		1393	char *filename;
		1394	asprintf (&filename,
		1395	"%s/%s",
		1396	confbase,
		1397	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1398
		1399	return filename;
		1400	}
		1401
		1402	inline const char *
		1403	connection::script_node_down ()
		1404	{
		1405	script_init_connect_env ();
		1406
1233	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1234		1408
1235	char *filename;	1409	char *filename;
1236	asprintf (&filename,	1410	asprintf (&filename,
1237	"%s/%s",	1411	"%s/%s",
1238	confbase,	1412	confbase,
…		…
1240		1414
1241	return filename;	1415	return filename;
1242	}	1416	}
1243		1417
1244	connection::connection (struct vpn *vpn, conf_node *conf)	1418	connection::connection (struct vpn *vpn, conf_node *conf)
1245	: vpn(vpn), conf(conf)	1419	: vpn(vpn), conf(conf),
1246	, rekey (this, &connection::rekey_cb)
1247	, keepalive (this, &connection::keepalive_cb)
1248	, establish_connection (this, &connection::establish_connection_cb)
1249	#if ENABLE_DNS	1420	#if ENABLE_DNS
1250	, dns (0)	1421	dns (0),
1251	#endif	1422	#endif
		1423	data_queue(conf->max_ttl, conf->max_queue + 1),
		1424	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1252	{	1425	{
		1426	rekey .set<connection, &connection::rekey_cb > (this);
		1427	keepalive .set<connection, &connection::keepalive_cb > (this);
		1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1429
		1430	last_establish_attempt = 0.;
1253	octx = ictx = 0;	1431	octx = ictx = 0;
1254	retry_cnt = 0;
1255		1432
1256	if (!conf->protocols) // make sure some protocol is enabled	1433	connectmode = conf->connectmode;
1257	conf->protocols = PROT_UDPv4;
1258		1434
1259	connectmode = conf_node::C_ALWAYS; // initial setting	1435	// queue a dummy packet to force an initial connection attempt
		1436	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1437	vpn_queue.put (new net_packet);
		1438
1260	reset_connection ();	1439	reset_connection ();
1261	}	1440	}
1262		1441
1263	connection::~connection ()	1442	connection::~connection ()
1264	{	1443	{
1265	shutdown ();	1444	shutdown ();
1266	}	1445	}
1267		1446
		1447	void
1268	void connection_init ()	1448	connection_init ()
1269	{	1449	{
1270	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1271	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1272	}	1452	}
1273		1453

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