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Comparing gvpe/src/connection.C (file contents):
Revision 1.57 by pcg, Thu Jul 7 14:41:51 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
464	f |= FEATURE_COMPRESSION;	560	f |= FEATURE_COMPRESSION;
465	#endif	561	#endif
466	#if ENABLE_ROHC	562	#if ENABLE_ROHC
467	f |= FEATURE_ROHC;	563	f |= FEATURE_ROHC;
468	#endif	564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
469	return f;	568	return f;
470	}	569	}
471	};	570	};
472		571
		572	void
473	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
474	{	574	{
475	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
476	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
477	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
478	hmaclen = HMACLENGTH;
479	flags = 0;	578	flags = 0;
480	challengelen = sizeof (rsachallenge);
481	features = get_features ();	579	features = get_features ();
482		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
483	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
484	digest_nid = htonl (EVP_MD_type (RSA_HASH));
485	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 ()));
486		586
487	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
488	set_hdr (type, dst);	588	set_hdr (type, dst);
489	}	589	}
490		590
491	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
492	{	593	{
493	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
494	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);
495	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
496	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)"),
497	else if (hmaclen != HMACLENGTH)	599	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)))	600	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));	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
503	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	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)))	603	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));	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 ()));
507	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)
508	return true;	617	return true;
		618	}
509		619
510	return false;	620	return false;
511	}	621	}
512		622
513	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
514	{	624	{
515	char magic[8];	625	char magic[8];
516	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
517	u8 protocols; // supported protocols (will be patched on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
518	u8 pad2, pad3;	628	u8 pad2, pad3;
519	rsaid id;	629	auth_encr encr;
520	rsaencrdata encr;
521		630
522	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
523	{	632	{
524	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
525	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
526	initiate = !!initiate_;	635	initiate = !!initiate_;
527	protocols = protocols_;	636	protocols = protocols_;
528		637
529	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
530	}	639	}
531	};	640	};
532		641
533	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
534	{	643	{
535	rsaid id;
536	u8 pad1, pad2, pad3;
537	u8 response_len; // encrypted length
538	rsaresponse response;	644	auth_response response;
539		645
540	auth_res_packet (int dst)	646	auth_res_packet (int dst)
541	{	647	{
542	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
543		649
544	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
545	}	651	}
546	};	652	};
547		653
…		…
577	};	683	};
578		684
579	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
580		686
581	void	687	void
582	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
583	{	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
584	if (ictx && octx)	723	if (ictx && octx)
585	{	724	{
586	connectmode = conf->connectmode;	725	while (tap_packet *p = (tap_packet *)data_queue.get ())
587
588	// make sure rekeying timeouts are slightly asymmetric
589	rekey.start (NOW + ::conf.rekey
590	+ (conf->id > THISNODE->id ? 10 : 0));
591	keepalive.start (NOW + ::conf.keepalive);
592
593	// send queued packets
594	if (ictx && octx)
595	{	726	{
596	while (tap_packet *p = (tap_packet *)data_queue.get ())
597	{
598	send_data_packet (p);	727	if (p->len) send_data_packet (p);
599	delete p;	728	delete p;
600	}
601
602	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
603	{
604	send_vpn_packet (p, si, IPTOS_RELIABILITY);
605	delete p;
606	}
607	}	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	}
608	}	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 ());
609	else	746	else
610	{	747	{
611	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	establish_connection.start (NOW + 5);	749	protocol = 0;
613	keepalive.stop ();
614	rekey.stop ();
615	}	750	}
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		751
628	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
629	}	755	}
630		756
631	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
632	const sockinfo &	758	const sockinfo &
633	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
634	{	760	{
635	if (!si.valid ())	761	if (!si.valid ())
636	{	762	{
637	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
638		764
639	if (r)	765	if (r)
640	{	766	{
641	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."),
642	conf->nodename, r->conf->nodename, (const char *)r->si);	768	conf->nodename, r->conf->nodename);
643	return r->si;	769	return r->si;
644	}	770	}
645	else	771	else
646	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
647	conf->nodename);	773	conf->nodename);
648	}	774	}
649		775
650	return si;	776	return si;
651	}	777	}
…		…
661	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
662	{	788	{
663	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
664		790
665	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);
666	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
667		795
668	delete pkt;	796	delete pkt;
669	}	797	}
670		798
…		…
685	void	813	void
686	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
687	{	815	{
688	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);
689		817
690	rsachallenge chg;	818	generate_auth_data ();
691	rsa_cache.gen (pkt->id, chg);
692	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
693		820
694	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);
695
696	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
697		823
698	delete pkt;	824	delete pkt;
699	}	825	}
700		826
701	void	827	void
702	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
703	{	829	{
704	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
705		831
706	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);
707		834
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);	835	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	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
715		837
716	delete pkt;	838	delete pkt;
717	}	839	}
718		840
719	void	841	void
720	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
721	{	843	{
722	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
723	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
724		847
725	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);
726		849
727	r->hmac_set (octx);	850	r->hmac_set (octx);
728	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
729		852
730	delete r;	853	delete r;
731	}	854	}
732		855
733	void	856	inline void
734	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
735	{	858	{
736	if (!ictx	859	if (!(ictx && octx)
737	&& conf != THISNODE	860	&& conf != THISNODE
738	&& connectmode != conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
739	&& connectmode != conf_node::C_DISABLED	862	&& connectmode != conf_node::C_DISABLED
740	&& NOW > w.at)	863	&& !w.is_active ())
741	{	864	{
742	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	}
743		872
744	double retry_int = double (retry_cnt & 3	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
745	? (retry_cnt & 3) + 1	876	? (retry_cnt & 3) + 1
746	: 1 << (retry_cnt >> 2));	877	: 1 << (retry_cnt >> 2));
747		878
748	reset_si ();	879	reset_si ();
749		880
750	bool slow = si.prot & PROT_SLOW;	881	bool slow = si.prot & PROT_SLOW;
751		882
752	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);
753	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
754	else	889	else
755	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
756	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
757		896
758	slow = slow || (dsi.prot & PROT_SLOW);	897	slow = slow || (dsi.prot & PROT_SLOW);
759		898
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
…		…
764	else	903	else
765	send_ping (dsi, 0);	904	send_ping (dsi, 0);
766	}	905	}
767	}	906	}
768		907
769	retry_int *= slow ? 8. : 0.7;	908	retry_int *= slow ? 8. : 0.9;
770		909
771	if (retry_int < conf->max_retry)	910	if (retry_int < conf->max_retry)
772	retry_cnt++;	911	retry_cnt++;
773	else	912	else
774	retry_int = conf->max_retry;	913	retry_int = conf->max_retry;
775		914
776	w.start (NOW + retry_int);	915	w.start (retry_int);
777	}	916	}
778	}	917	}
779		918
780	void	919	void
781	connection::reset_connection ()	920	connection::reset_connection ()
…		…
784	{	923	{
785	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
786	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
787		926
788	if (::conf.script_node_down)	927	if (::conf.script_node_down)
789	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);
790	slog (L_WARN, _("node-down command execution failed, continuing."));	931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
791	}	933	}
792		934
793	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
794	delete octx; octx = 0;	936	delete octx; octx = 0;
795	#if ENABLE_DNS
796	dnsv4_reset_connection ();
797	#endif
798		937
799	si.host = 0;	938	si.host = 0;
800		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
801	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
802	retry_cnt = 0;	946	retry_cnt = 0;
803		947
804	rekey.stop ();	948	rekey.stop ();
805	keepalive.stop ();	949	keepalive.stop ();
806	establish_connection.stop ();	950	establish_connection.stop ();
…		…
813	send_reset (si);	957	send_reset (si);
814		958
815	reset_connection ();	959	reset_connection ();
816	}	960	}
817		961
818	void	962	// poor-man's rekeying
819	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
820	{	965	{
821	reset_connection ();	966	reset_connection ();
822	establish_connection ();	967	establish_connection ();
823	}	968	}
824		969
…		…
840	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
841	rekey ();	986	rekey ();
842	}	987	}
843		988
844	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
845	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1000	connection::inject_data_packet (tap_packet *pkt)
846	{	1001	{
847	if (ictx && octx)	1002	if (ictx && octx)
848	send_data_packet (pkt);	1003	send_data_packet (pkt);
849	else	1004	else
850	{	1005	{
851	if (!broadcast)
852	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
853		1007	post_inject_queue ();
854	establish_connection ();
855	}	1008	}
856	}	1009	}
857		1010
		1011	void
858	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
859	{	1013	{
860	if (ictx && octx)	1014	if (ictx && octx)
861	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
862	else	1016	else
863	{	1017	{
864	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
865		1019	post_inject_queue ();
866	establish_connection ();
867	}	1020	}
868	}	1021	}
869		1022
870	void	1023	void
871	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
872	{	1025	{
873	last_activity = NOW;	1026	last_activity = ev_now ();
874		1027
875	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.",
876	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;
877		1033
878	switch (pkt->typ ())	1034	switch (pkt->typ ())
879	{	1035	{
880	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
881	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
882	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
883	// when we receive a ping.	1041	// when we receive a ping.
884	if (!ictx)	1042	if (!ictx)
885	{	1043	{
886	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
887	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
888	}	1046	}
889	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.
890	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
891		1051
892	break;	1052	break;
893		1053
894	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 ();
895	break;	1060	break;
896		1061
897	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
898	{	1063	{
899	reset_connection ();	1064	reset_connection ();
900		1065
901	config_packet *p = (config_packet *) pkt;	1066	config_packet *p = (config_packet *) pkt;
902		1067
903	if (!p->chk_config ())	1068	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 ();	1069	establish_connection ();
911	}	1070	}
912	break;	1071	break;
913		1072
914	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
915	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
916	{	1075	{
917	auth_req_packet *p = (auth_req_packet *) pkt;	1076	auth_req_packet *p = (auth_req_packet *)pkt;
918		1077
919	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);
920		1081
921	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))
922	{	1088	{
923	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
924	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."),
925	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
926	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
927		1093
928	if (p->initiate)	1094	if (p->initiate)
929	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
930		1096
931	rsachallenge k;	1097	auth_data auth;
932		1098
933	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
934	{	1100	{
935	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?"),
936	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));
937	break;
938	}	1103	}
939	else	1104	else
940	{	1105	{
941	delete octx;	1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
942		1107
943	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
944	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
945		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
946	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1116	features = p->features & config_packet::get_features ();
948		1117
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1118	connection_established (rsi);
952
953	break;	1119	}
954	}	1120	}
		1121
		1122	break;
955	}	1123	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1124
960	send_reset (rsi);	1125	send_reset (rsi);
961	}	1126	}
962		1127
963	break;	1128	break;
964		1129
965	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
966	{	1131	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
968		1133
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1135
971	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))
972	{	1140	{
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"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
984	break;
985	}
986	else
987	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);
989
990	if (!p->hmac_chk (cctx))
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 ();
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	}	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;
1034	}	1153	}
1035		1154
1036	send_reset (rsi);	1155	send_reset (rsi);
1037	break;	1156	break;
1038		1157
…		…
1048	{	1167	{
1049	vpndata_packet *p = (vpndata_packet *)pkt;	1168	vpndata_packet *p = (vpndata_packet *)pkt;
1050		1169
1051	if (!p->hmac_chk (ictx))	1170	if (!p->hmac_chk (ictx))
1052	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"
1053	"could be an attack, or just corruption or a synchronization error"),	1172	"could be an attack, or just corruption or a synchronization error."),
1054	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
1055	else	1174	else
1056	{	1175	{
1057	u32 seqno;	1176	u32 seqno;
1058	tap_packet *d = p->unpack (this, seqno);	1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
1059		1179
1060	if (iseqno.recv_ok (seqno))	1180	if (seqclass == 0) // ok
1061	{	1181	{
1062	vpn->tap->send (d);	1182	vpn->tap->send (d);
1063		1183
1064	if (si != rsi)	1184	if (si != rsi)
1065	{	1185	{
1066	// 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.)
1067	si = rsi;	1188	// {
1068
1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1070	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);
1071	}	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);
1072	}	1218	}
1073		1219
1074	delete d;	1220	delete d;
1075	break;	1221	break;
1076	}	1222	}
…		…
1080	break;	1226	break;
1081		1227
1082	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1084	{	1230	{
1085	connect_req_packet *p = (connect_req_packet *) pkt;	1231	connect_req_packet *p = (connect_req_packet *)pkt;
1086		1232
1087	if (p->id > 0 && p->id <= vpn->conns.size ())	1233	if (p->id > 0 && p->id <= vpn->conns.size ())
1088	{	1234	{
1089	connection *c = vpn->conns[p->id - 1];	1235	connection *c = vpn->conns[p->id - 1];
1090	conf->protocols = p->protocols;	1236	conf->protocols = p->protocols;
1091		1237
1092	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	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,
1093	conf->id, p->id, c->ictx && c->octx);	1241	c->ictx && c->octx);
1094		1242
1095	if (c->ictx && c->octx)	1243	if (c->ictx && c->octx)
1096	{	1244	{
1097	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
1098	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
…		…
1121		1269
1122	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1123	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));
1124	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1125		1273
1126	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]",
1127	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);
1128		1282
1129	const sockinfo &dsi = forward_si (p->si);	1283	const sockinfo &dsi = forward_si (p->si);
1130		1284
1131	if (dsi.valid ())	1285	if (dsi.valid ())
1132	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);
1133	}	1291	}
1134	else	1292	else
1135	slog (L_WARN,	1293	slog (L_WARN,
1136	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137	p->id);	1295	p->id);
…		…
1143	send_reset (rsi);	1301	send_reset (rsi);
1144	break;	1302	break;
1145	}	1303	}
1146	}	1304	}
1147		1305
1148	void connection::keepalive_cb (time_watcher &w)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1149	{	1308	{
1150	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)
1151	{	1314	{
1152	reset_connection ();	1315	reset_connection ();
1153	establish_connection ();	1316	establish_connection ();
1154	}	1317	}
1155	else if (NOW < last_activity + ::conf.keepalive)
1156	w.start (last_activity + ::conf.keepalive);
1157	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1158	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1159	{	1320	{
		1321	w.start (3);
1160	send_ping (si);	1322	send_ping (si);
1161	w.start (NOW + 5);
1162	}	1323	}
1163	else if (NOW < last_activity + ::conf.keepalive + 10)	1324	else if (when >= -10)
1164	// hold ondemand connections implicitly a few seconds longer	1325	// hold ondemand connections implicitly a few seconds longer
1165	// should delete octx, though, or something like that ;)	1326	// should delete octx, though, or something like that ;)
1166	w.start (last_activity + ::conf.keepalive + 10);	1327	w.start (when + 10);
1167	else	1328	else
1168	reset_connection ();	1329	reset_connection ();
1169	}	1330	}
1170		1331
		1332	void
1171	void connection::send_connect_request (int id)	1333	connection::send_connect_request (int id)
1172	{	1334	{
1173	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);
1174		1336
1175	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);
1176	p->hmac_set (octx);	1340	p->hmac_set (octx);
1177	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1178		1342
1179	delete p;	1343	delete p;
1180	}	1344	}
1181		1345
		1346	void
1182	void connection::script_init_env (const char *ext)	1347	connection::script_init_env (const char *ext)
1183	{	1348	{
1184	char *env;	1349	char *env;
1185	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);
1186	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1351	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1352	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1353	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189	conf->id & 0xff); putenv (env);	1354	conf->id & 0xff); putenv (env);
1190	}	1355	}
1191		1356
		1357	void
1192	void connection::script_init_connect_env ()	1358	connection::script_init_connect_env ()
1193	{	1359	{
1194	vpn->script_init_env ();	1360	vpn->script_init_env ();
1195		1361
1196	char *env;	1362	char *env;
1197	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);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1368	}
1202		1369
		1370	inline const char *
1203	const char *connection::script_node_up ()	1371	connection::script_node_up ()
1204	{	1372	{
1205	script_init_connect_env ();	1373	script_init_connect_env ();
1206		1374
1207	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1208		1376
1209	char *filename;	1377	char *filename;
1210	asprintf (&filename,	1378	asprintf (&filename,
1211	"%s/%s",	1379	"%s/%s",
1212	confbase,	1380	confbase,
1213	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1214		1382
1215	return filename;	1383	return filename;
1216	}	1384	}
1217		1385
1218	const char *connection::script_node_down ()	1386	inline const char *
		1387	connection::script_node_change ()
1219	{	1388	{
1220	script_init_connect_env ();	1389	script_init_connect_env ();
1221		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
1222	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1223		1408
1224	char *filename;	1409	char *filename;
1225	asprintf (&filename,	1410	asprintf (&filename,
1226	"%s/%s",	1411	"%s/%s",
1227	confbase,	1412	confbase,
…		…
1229		1414
1230	return filename;	1415	return filename;
1231	}	1416	}
1232		1417
1233	connection::connection (struct vpn *vpn, conf_node *conf)	1418	connection::connection (struct vpn *vpn, conf_node *conf)
1234	: vpn(vpn), conf(conf)	1419	: 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	1420	#if ENABLE_DNS
1239	, dns (0)	1421	dns (0),
1240	#endif	1422	#endif
		1423	data_queue(conf->max_ttl, conf->max_queue + 1),
		1424	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1241	{	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.;
1242	octx = ictx = 0;	1431	octx = ictx = 0;
1243	retry_cnt = 0;
1244		1432
1245	if (!conf->protocols) // make sure some protocol is enabled	1433	connectmode = conf->connectmode;
1246	conf->protocols = PROT_UDPv4;
1247		1434
1248	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
1249	reset_connection ();	1439	reset_connection ();
1250	}	1440	}
1251		1441
1252	connection::~connection ()	1442	connection::~connection ()
1253	{	1443	{
1254	shutdown ();	1444	shutdown ();
1255	}	1445	}
1256		1446
		1447	void
1257	void connection_init ()	1448	connection_init ()
1258	{	1449	{
1259	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1260	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1261	}	1452	}
1262		1453

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