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Comparing gvpe/src/connection.C (file contents):
Revision 1.30 by pcg, Thu Jan 29 19:22:05 2004 UTC vs.
Revision 1.106 by root, Fri Jul 19 21:01:16 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
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>
30
31	#include "gettext.h"
32		42
33	#include "conf.h"	43	#include "conf.h"
34	#include "slog.h"	44	#include "slog.h"
35	#include "device.h"	45	#include "device.h"
36	#include "vpn.h"	46	#include "vpn.h"
37	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
38		49
39	#include "netcompat.h"	50	#include "netcompat.h"
40		51
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	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
46		54
47	#define ULTRA_FAST 1	55	#define ULTRA_FAST 1
48	#define HLOG 15	56	#define HLOG 15
49	#include "lzf/lzf.h"	57	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	58	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	59	#include "lzf/lzf_d.c"
52		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
53	struct crypto_ctx	105	struct crypto_ctx
54	{	106	{
55	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	108	HMAC_CTX hctx;
57		109
58	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);
59	~crypto_ctx ();	111	~crypto_ctx ();
60	};	112	};
61		113
62	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)
63	{	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
64	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
65	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));
66	HMAC_CTX_init (&hctx);	146	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	147	}
69		148
70	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
71	{	150	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
74	}	153	}
75		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
76	static void	182	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	184	{
79	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	189	}
88		190
89	struct rsa_entry {	191	void
90	tstamp expire;	192	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	193	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		199
139	} rsa_cache;	200	// eventual response data
140		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	202	}
145	w.start (NOW + RSA_TTL);
146		203
147	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
148	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	206	}
154		207
155	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
156		209
157	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)
158	{	212	{
159	if (queue[i])	213	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		214
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	215	i = 0;
187	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	219	}
189		220
190	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
191	{	222	{
192	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
193	delete queue[i];	226	delete [] queue;
194	}	227	}
195		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
196	struct net_rateinfo {	285	struct net_rateinfo
		286	{
197	u32 host;	287	u32 host;
198	double pcnt, diff;	288	double pcnt, diff;
199	tstamp last;	289	tstamp last;
200	};	290	};
201		291
202	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
203	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
204	// but low on resources.	294	// but low on resources.
205	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
206	{	296	{
207	static const double ALPHA = 1. - 1. / 600.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208	static const double CUTOFF = 10.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
211		301
212	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	303	bool can (u32 host);
214	};	304	};
215		305
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		307
		308	bool
218	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
219	{	310	{
220	iterator i;	311	iterator i;
221		312
222	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
223	if (i->host == host)	314	if (i->host == host)
224	break;	315	break;
225	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	317	i = erase (i);
227	else	318	else
228	i++;	319	i++;
229		320
230	if (i == end ())	321	if (i == end ())
231	{	322	{
232	net_rateinfo ri;	323	net_rateinfo ri;
233		324
234	ri.host = host;	325	ri.host = host;
235	ri.pcnt = 1.;	326	ri.pcnt = 1.;
236	ri.diff = MAXDIF;	327	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	328	ri.last = ev_now ();
238		329
239	push_front (ri);	330	push_front (ri);
240		331
241	return true;	332	return true;
242	}	333	}
243	else	334	else
244	{	335	{
245	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
246	erase (i);	337	erase (i);
247		338
248	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		341
251	ri.last = NOW;	342	ri.last = ev_now ();
252		343
253	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
254		345
255	bool send = dif > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
256		347
257	if (dif > MAXDIF)	348	if (dif > NRL_MAXDIF)
258	{	349	{
259	ri.pcnt = 1.;	350	ri.pcnt = 1.;
260	ri.diff = MAXDIF;	351	ri.diff = NRL_MAXDIF;
261	}	352	}
262	else if (send)	353	else if (send)
263	ri.pcnt++;	354	ri.pcnt++;
264		355
265	push_front (ri);	356	push_front (ri);
…		…
268	}	359	}
269	}	360	}
270		361
271	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
272		363
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	366	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
280		368
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	372	}
286		373
287	void	374	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	376	{
290	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		378	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	380	}
294		381
295	bool	382	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	384	{
298	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		386	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	388	}
302		389
		390	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	392	{
305	type = type_;	393	type = type_;
306		394
307	int src = THISNODE->id;	395	int src = THISNODE->id;
308		396
…		…
313		401
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		404
317	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
318	{	414	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	416	}
		417	};
330		418
331	void	419	void
332	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)
333	{	421	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
335	int outl = 0, outl2;	423	int outl = 0, outl2;
336	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
337		425
338	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
340	u32 cl;
341		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
342	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
343	if (cl)	433	if (cl)
344	{	434	{
345	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
346	d = cdata;	436	d = cdata;
347	l = cl + 2;	437	l = cl + 2;
348		438
349	d[0] = cl >> 8;	439	d[0] = cl >> 8;
350	d[1] = cl;	440	d[1] = cl;
		441	}
351	}	442	}
352	#endif	443	#endif
353		444
354	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
355		446
356	struct {	447	struct {
357	#if RAND_SIZE	448	#if RAND_SIZE
358	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
359	#endif	450	#endif
360	u32 seqno;	451	u32 seqno;
361	} datahdr;	452	} datahdr;
362		453
363	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
364	#if RAND_SIZE	455	#if RAND_SIZE
365	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);
366	#endif	459	#endif
367		460
368	require (EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) &datahdr, DATAHDR));	463	(unsigned char *) &datahdr, DATAHDR));
…		…
392	int outl = 0, outl2;	485	int outl = 0, outl2;
393	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
394	u8 *d;	487	u8 *d;
395	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
396		489
397	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
398		491
399	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
400	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
401		494
402	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
403	d = cdata;	496	d = cdata;
404	else	497	else
405	#endif	498	#endif
406	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
407		500
408	/* 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
409	require (EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
410	d, &outl2,	509	d, &outl2,
411	(unsigned char *)&data, len - data_hdr_size ()));	510	(unsigned char *)&data, len - data_hdr_size ()));
412	outl += outl2;	511	outl += outl2;
413		512
…		…
444	}	543	}
445	};	544	};
446		545
447	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
448	{	547	{
449	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
450	// field comes before this data, so peers with other
451	// hmacs simply will not work.
452	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
453	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
454	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
455		552
456	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
457	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f |= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f |= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
458	return 0x80	568	return f;
459	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
460	}	569	}
461
462	void setup (ptype type, int dst);
463	bool chk_config () const;
464	};	570	};
465		571
		572	void
466	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
467	{	574	{
468	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
469	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
470	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
471	hmaclen = HMACLENGTH;	578	flags = 0;
472	flags = curflags ();	579	features = get_features ();
473	challengelen = sizeof (rsachallenge);
474		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
475	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
476	digest_nid = htonl (EVP_MD_type (RSA_HASH));
477	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 ()));
478		586
479	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
480	set_hdr (type, dst);	588	set_hdr (type, dst);
481	}	589	}
482		590
483	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
484	{	593	{
485	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
486	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);
487	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
488	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)"),
489	else if (hmaclen != HMACLENGTH)	599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
490	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
491	else if (flags != curflags ())
492	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
493	else if (challengelen != sizeof (rsachallenge))
494	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
495	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
496	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)"),
497	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
498	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
499	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
500	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 ()));
501	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)
502	return true;	617	return true;
		618	}
503		619
504	return false;	620	return false;
505	}	621	}
506		622
507	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
508	{	624	{
509	char magic[8];	625	char magic[8];
510	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
511	u8 protocols; // supported protocols (will be patched on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
512	u8 pad2, pad3;	628	u8 pad2, pad3;
513	rsaid id;	629	auth_encr encr;
514	rsaencrdata encr;
515		630
516	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
517	{	632	{
518	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
519	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
520	initiate = !!initiate_;	635	initiate = !!initiate_;
521	protocols = protocols_;	636	protocols = protocols_;
522		637
523	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
524	}	639	}
525	};	640	};
526		641
527	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
528	{	643	{
529	rsaid id;
530	u8 pad1, pad2, pad3;
531	u8 response_len; // encrypted length
532	rsaresponse response;	644	auth_response response;
533		645
534	auth_res_packet (int dst)	646	auth_res_packet (int dst)
535	{	647	{
536	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
537		649
538	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
539	}	651	}
540	};	652	};
541		653
…		…
571	};	683	};
572		684
573	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
574		686
575	void	687	void
576	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
577	{	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
578	if (ictx && octx)	723	if (ictx && octx)
579	{	724	{
580	connectmode = conf->connectmode;	725	while (tap_packet *p = (tap_packet *)data_queue.get ())
581
582	rekey.start (NOW + ::conf.rekey);
583	keepalive.start (NOW + ::conf.keepalive);
584
585	// send queued packets
586	if (ictx && octx)
587	{	726	{
588	while (tap_packet *p = (tap_packet *)data_queue.get ())
589	{
590	send_data_packet (p);	727	if (p->len) send_data_packet (p);
591	delete p;	728	delete p;
592	}
593
594	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
595	{
596	send_vpn_packet (p, si, IPTOS_RELIABILITY);
597	delete p;
598	}
599	}	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	}
600	}	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 ());
601	else	746	else
602	{	747	{
603	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
604	establish_connection.start (NOW + 5);	749	protocol = 0;
605	keepalive.stop ();
606	rekey.stop ();
607	}	750	}
608	}
609
610	void
611	connection::reset_si ()
612	{
613	protocol = best_protocol (THISNODE->protocols & conf->protocols);
614
615	// mask out protocols we cannot establish
616	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
617	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
618		751
619	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
620	}	755	}
621		756
622	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
623	const sockinfo &	758	const sockinfo &
624	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
625	{	760	{
626	if (!si.valid ())	761	if (!si.valid ())
627	{	762	{
628	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
629		764
630	if (r)	765	if (r)
631	{	766	{
632	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
633	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
634	return r->si;	769	return r->si;
635	}	770	}
636	else	771	else
637	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
638	conf->nodename);	773	conf->nodename);
639	}	774	}
640		775
641	return si;	776	return si;
642	}	777	}
…		…
652	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
653	{	788	{
654	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
655		790
656	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);
657	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
658		795
659	delete pkt;	796	delete pkt;
660	}	797	}
661		798
…		…
676	void	813	void
677	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
678	{	815	{
679	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);
680		817
681	rsachallenge chg;	818	generate_auth_data ();
682	rsa_cache.gen (pkt->id, chg);
683	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
684		820
685	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);
686
687	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
688		823
689	delete pkt;	824	delete pkt;
690	}	825	}
691		826
692	void	827	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
694	{	829	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		831
697	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);
698		834
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	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);
704
705	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
706		837
707	delete pkt;	838	delete pkt;
708	}	839	}
709		840
710	void	841	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	843	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
715		847
716	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);
717		849
718	r->hmac_set (octx);	850	r->hmac_set (octx);
719	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
720		852
721	delete r;	853	delete r;
722	}	854	}
723		855
724	void	856	inline void
725	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	858	{
727	if (!ictx	859	if (!(ictx && octx)
728	&& conf != THISNODE	860	&& conf != THISNODE
729	&& connectmode != conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
730	&& connectmode != conf_node::C_DISABLED	862	&& connectmode != conf_node::C_DISABLED
731	&& NOW > w.at)	863	&& !w.is_active ())
732	{	864	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		866	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
736	retry_cnt++;	870	return;
		871	}
737		872
738	w.start (NOW + retry_int);	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
739		878
740	reset_si ();	879	reset_si ();
741		880
742	if (si.prot && !si.host)	881	bool slow = si.prot & PROT_SLOW;
		882
		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);
743	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
744	else	889	else
745	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
746	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow || (dsi.prot & PROT_SLOW);
747		898
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	900	{
750	if (retry_cnt < 4)	901	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
752	else	903	else
753	send_ping (dsi, 0);	904	send_ping (dsi, 0);
754	}	905	}
755	}	906	}
		907
		908	retry_int *= slow ? 8. : 0.9;
		909
		910	if (retry_int < conf->max_retry)
		911	retry_cnt++;
		912	else
		913	retry_int = conf->max_retry;
		914
		915	w.start (retry_int);
756	}	916	}
757	}	917	}
758		918
759	void	919	void
760	connection::reset_connection ()	920	connection::reset_connection ()
…		…
763	{	923	{
764	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
766		926
767	if (::conf.script_node_down)	927	if (::conf.script_node_down)
768	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);
		931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
769	}	933	}
770		934
771	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
772	delete octx; octx = 0;	936	delete octx; octx = 0;
773		937
774	si.host= 0;	938	si.host = 0;
775		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
776	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
777	retry_cnt = 0;	946	retry_cnt = 0;
778		947
779	rekey.stop ();	948	rekey.stop ();
780	keepalive.stop ();	949	keepalive.stop ();
781	establish_connection.stop ();	950	establish_connection.stop ();
…		…
788	send_reset (si);	957	send_reset (si);
789		958
790	reset_connection ();	959	reset_connection ();
791	}	960	}
792		961
793	void	962	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
795	{	965	{
796	reset_connection ();	966	reset_connection ();
797	establish_connection ();	967	establish_connection ();
798	}	968	}
799		969
…		…
815	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
816	rekey ();	986	rekey ();
817	}	987	}
818		988
819	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
820	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1000	connection::inject_data_packet (tap_packet *pkt)
821	{	1001	{
822	if (ictx && octx)	1002	if (ictx && octx)
823	send_data_packet (pkt);	1003	send_data_packet (pkt);
824	else	1004	else
825	{	1005	{
826	if (!broadcast)//DDDD
827	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
828		1007	post_inject_queue ();
829	establish_connection ();
830	}	1008	}
831	}	1009	}
832		1010
		1011	void
833	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
834	{	1013	{
835	if (ictx && octx)	1014	if (ictx && octx)
836	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
837	else	1016	else
838	{	1017	{
839	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
840		1019	post_inject_queue ();
841	establish_connection ();
842	}	1020	}
843	}	1021	}
844		1022
845	void	1023	void
846	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
847	{	1025	{
848	last_activity = NOW;	1026	last_activity = ev_now ();
849		1027
850	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.",
851	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;
852		1033
853	switch (pkt->typ ())	1034	switch (pkt->typ ())
854	{	1035	{
855	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
856	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
857	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
858	// when we receive a ping.	1041	// when we receive a ping.
859	if (!ictx)	1042	if (!ictx)
860	{	1043	{
861	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
862	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
863	}	1046	}
864	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.
865	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
866		1051
867	break;	1052	break;
868		1053
869	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 ();
870	break;	1060	break;
871		1061
872	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
873	{	1063	{
874	reset_connection ();	1064	reset_connection ();
875		1065
876	config_packet *p = (config_packet *) pkt;	1066	config_packet *p = (config_packet *) pkt;
877		1067
878	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
879	{
880	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
881	conf->nodename, (const char *)rsi);
882	connectmode = conf_node::C_DISABLED;
883	}
884	else if (connectmode == conf_node::C_ALWAYS)
885	establish_connection ();	1069	establish_connection ();
886	}	1070	}
887	break;	1071	break;
888		1072
889	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
890	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
891	{	1075	{
892	auth_req_packet *p = (auth_req_packet *) pkt;	1076	auth_req_packet *p = (auth_req_packet *)pkt;
893		1077
894	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);
895		1081
896	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))
897	{	1088	{
898	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
899	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."),
900	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
901	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
902		1093
903	if (p->initiate)	1094	if (p->initiate)
904	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
905		1096
906	rsachallenge k;	1097	auth_data auth;
907		1098
908	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
909	{	1100	{
910	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?"),
911	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));
912	break;
913	}	1103	}
914	else	1104	else
915	{	1105	{
916	delete octx;	1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
917		1107
918	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
919	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
920		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
921	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
		1116	features = p->features & config_packet::get_features ();
922		1117
923	send_auth_response (rsi, p->id, k);
924
925	connection_established ();	1118	connection_established (rsi);
926
927	break;	1119	}
928	}	1120	}
		1121
		1122	break;
929	}	1123	}
930	else
931	slog (L_WARN, _("%s(%s): protocol mismatch"),
932	conf->nodename, (const char *)rsi);
933		1124
934	send_reset (rsi);	1125	send_reset (rsi);
935	}	1126	}
936		1127
937	break;	1128	break;
938		1129
939	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
940	{	1131	{
941	auth_res_packet *p = (auth_res_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
942		1133
943	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
944		1135
945	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))
946	{	1140	{
947	if (p->prot_minor != PROTOCOL_MINOR)
948	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
949	conf->nodename, (const char *)rsi,
950	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
951
952	rsachallenge chg;
953
954	if (!rsa_cache.find (p->id, chg))
955	{
956	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
957	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
958	break;
959	}	1143	}
960	else	1144	else if (!have_snd_auth)
961	{	1145	{
962	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
963		1147
964	if (!p->hmac_chk (cctx))	1148	have_snd_auth = true;
965	{
966	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
967	"could be an attack, or just corruption or a synchronization error"),
968	conf->nodename, (const char *)rsi);
969	break;
970	}
971	else
972	{
973	rsaresponse h;
974
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;
980
981	delete ictx; ictx = cctx;
982
983	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();	1149	connection_established (rsi);
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}
1006	}	1150	}
1007	}	1151	}
1008
1009	send_reset (rsi);
1010	break;	1152	break;
1011		1153
1012	case vpn_packet::PT_DATA_COMPRESSED:	1154	case vpn_packet::PT_DATA_COMPRESSED:
1013	#if !ENABLE_COMPRESSION	1155	#if !ENABLE_COMPRESSION
1014	send_reset (rsi);	1156	send_reset (rsi);
…		…
1021	{	1163	{
1022	vpndata_packet *p = (vpndata_packet *)pkt;	1164	vpndata_packet *p = (vpndata_packet *)pkt;
1023		1165
1024	if (!p->hmac_chk (ictx))	1166	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1167	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or a synchronization error"),	1168	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1169	conf->nodename, (const char *)rsi);
1028	else	1170	else
1029	{	1171	{
1030	u32 seqno;	1172	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1173	tap_packet *d = p->unpack (this, seqno);
		1174	int seqclass = iseqno.seqno_classify (seqno);
1032		1175
1033	if (iseqno.recv_ok (seqno))	1176	if (seqclass == 0) // ok
1034	{	1177	{
1035	vpn->tap->send (d);	1178	vpn->tap->send (d);
1036		1179
1037	if (si != rsi)	1180	if (si != rsi)
1038	{	1181	{
1039	// fast re-sync on connection changes, useful especially for tcp/ip	1182	// fast re-sync on source address changes, useful especially for tcp/ip
		1183	//if (last_si_change < ev_now () + 5.)
1040	si = rsi;	1184	// {
1041
1042	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1185	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1043	conf->nodename, (const char *)si, (const char *)rsi);	1186	conf->nodename, (const char *)si, (const char *)rsi);
		1187
		1188	si = rsi;
		1189
		1190	if (::conf.script_node_change)
		1191	{
		1192	run_script_cb *cb = new run_script_cb;
		1193	cb->set<connection, &connection::script_node_change> (this);
		1194	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1195	}
		1196
		1197	// }
		1198	//else
		1199	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1200	// conf->nodename, (const char *)si, (const char *)rsi);
1044	}	1201	}
1045
1046	delete d;
1047
1048	break;
1049	}	1202	}
		1203	else if (seqclass == 1) // far history
		1204	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1205	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1206	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1207	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1208	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1209	else if (seqclass == 3) // reset
		1210	{
		1211	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1212	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1213	send_reset (rsi);
		1214	}
		1215
		1216	delete d;
		1217	break;
1050	}	1218	}
1051	}	1219	}
1052		1220
1053	send_reset (rsi);	1221	send_reset (rsi);
1054	break;	1222	break;
1055		1223
1056	case vpn_packet::PT_CONNECT_REQ:	1224	case vpn_packet::PT_CONNECT_REQ:
1057	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1225	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058	{	1226	{
1059	connect_req_packet *p = (connect_req_packet *) pkt;	1227	connect_req_packet *p = (connect_req_packet *)pkt;
1060		1228
1061	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1229	if (p->id > 0 && p->id <= vpn->conns.size ())
1062	connection *c = vpn->conns[p->id - 1];
1063	conf->protocols = p->protocols;
1064
1065	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1066	conf->id, p->id, c->ictx && c->octx);
1067
1068	if (c->ictx && c->octx)
1069	{	1230	{
		1231	connection *c = vpn->conns[p->id - 1];
		1232	conf->protocols = p->protocols;
		1233
		1234	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1235	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1236	p->protocols,
		1237	c->ictx && c->octx);
		1238
		1239	if (c->ictx && c->octx)
		1240	{
1070	// send connect_info packets to both sides, in case one is	1241	// send connect_info packets to both sides, in case one is
1071	// behind a nat firewall (or both ;)	1242	// behind a nat firewall (or both ;)
1072	c->send_connect_info (conf->id, si, conf->protocols);	1243	c->send_connect_info (conf->id, si, conf->protocols);
1073	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1244	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1245	}
		1246	else
		1247	c->establish_connection ();
1074	}	1248	}
1075	else	1249	else
1076	c->establish_connection ();	1250	slog (L_WARN,
		1251	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1252	p->id);
1077	}	1253	}
1078		1254
1079	break;	1255	break;
1080		1256
1081	case vpn_packet::PT_CONNECT_INFO:	1257	case vpn_packet::PT_CONNECT_INFO:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1259	{
1084	connect_info_packet *p = (connect_info_packet *) pkt;	1260	connect_info_packet *p = (connect_info_packet *)pkt;
1085		1261
1086	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1087		1263	{
1088	connection *c = vpn->conns[p->id - 1];	1264	connection *c = vpn->conns[p->id - 1];
1089		1265
1090	c->conf->protocols = p->protocols;	1266	c->conf->protocols = p->protocols;
1091	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1267	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1092	p->si.upgrade_protocol (protocol, c->conf);	1268	p->si.upgrade_protocol (protocol, c->conf);
1093		1269
1094	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1270	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1095	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1271	conf->nodename,
		1272	vpn->conns[p->id - 1]->conf->nodename,
		1273	(const char *)p->si,
		1274	p->protocols,
		1275	protocol,
		1276	p->si.supported_protocols (c->conf),
		1277	!c->ictx && !c->octx);
1096		1278
1097	const sockinfo &dsi = forward_si (p->si);	1279	const sockinfo &dsi = forward_si (p->si);
1098		1280
1099	if (dsi.valid ())	1281	if (dsi.valid ())
1100	c->send_auth_request (dsi, true);	1282	c->send_auth_request (dsi, true);
		1283	else
		1284	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1285	vpn->conns[p->id - 1]->conf->nodename,
		1286	(const char *)p->si);
		1287	}
		1288	else
		1289	slog (L_WARN,
		1290	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1291	p->id);
1101	}	1292	}
1102		1293
1103	break;	1294	break;
1104		1295
1105	default:	1296	default:
1106	send_reset (rsi);	1297	send_reset (rsi);
1107	break;	1298	break;
1108	}	1299	}
1109	}	1300	}
1110		1301
1111	void connection::keepalive_cb (time_watcher &w)	1302	inline void
		1303	connection::keepalive_cb (ev::timer &w, int revents)
1112	{	1304	{
1113	if (NOW >= last_activity + ::conf.keepalive + 30)	1305	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1306
		1307	if (when >= 0)
		1308	w.start (when);
		1309	else if (when < -15)
1114	{	1310	{
1115	reset_connection ();	1311	reset_connection ();
1116	establish_connection ();	1312	establish_connection ();
1117	}	1313	}
1118	else if (NOW < last_activity + ::conf.keepalive)
1119	w.start (last_activity + ::conf.keepalive);
1120	else if (conf->connectmode != conf_node::C_ONDEMAND	1314	else if (conf->connectmode != conf_node::C_ONDEMAND
1121	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1315	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1122	{	1316	{
		1317	w.start (3);
1123	send_ping (si);	1318	send_ping (si);
1124	w.start (NOW + 5);
1125	}	1319	}
1126	else if (NOW < last_activity + ::conf.keepalive + 10)	1320	else if (when >= -10)
1127	// hold ondemand connections implicitly a few seconds longer	1321	// hold ondemand connections implicitly a few seconds longer
1128	// should delete octx, though, or something like that ;)	1322	// should delete octx, though, or something like that ;)
1129	w.start (last_activity + ::conf.keepalive + 10);	1323	w.start (when + 10);
1130	else	1324	else
1131	reset_connection ();	1325	reset_connection ();
1132	}	1326	}
1133		1327
		1328	void
1134	void connection::send_connect_request (int id)	1329	connection::send_connect_request (int id)
1135	{	1330	{
1136	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1331	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1137		1332
1138	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1333	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1334	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1335	THISNODE->protocols);
1139	p->hmac_set (octx);	1336	p->hmac_set (octx);
1140	send_vpn_packet (p, si);	1337	send_vpn_packet (p, si);
1141		1338
1142	delete p;	1339	delete p;
1143	}	1340	}
1144		1341
1145	void connection::script_node ()	1342	void
		1343	connection::script_init_env (const char *ext)
1146	{	1344	{
1147	vpn->script_if_up ();
1148
1149	char *env;	1345	char *env;
		1346	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1347	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1348	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1349	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1350	conf->id & 0xff); putenv (env);
		1351	}
		1352
		1353	void
		1354	connection::script_init_connect_env ()
		1355	{
		1356	vpn->script_init_env ();
		1357
		1358	char *env;
1150	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1359	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1360	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1151	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154	}	1364	}
1155		1365
		1366	inline const char *
1156	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1157	{	1368	{
1158	script_node ();	1369	script_init_connect_env ();
1159		1370
1160	putenv ("STATE=up");	1371	putenv ((char *)"STATE=up");
1161		1372
		1373	char *filename;
		1374	asprintf (&filename,
		1375	"%s/%s",
		1376	confbase,
1162	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1163	}
1164		1378
		1379	return filename;
		1380	}
		1381
		1382	inline const char *
		1383	connection::script_node_change ()
		1384	{
		1385	script_init_connect_env ();
		1386
		1387	putenv ((char *)"STATE=change");
		1388
		1389	char *filename;
		1390	asprintf (&filename,
		1391	"%s/%s",
		1392	confbase,
		1393	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1394
		1395	return filename;
		1396	}
		1397
		1398	inline const char *
1165	const char *connection::script_node_down ()	1399	connection::script_node_down ()
1166	{	1400	{
1167	script_node ();	1401	script_init_connect_env ();
1168		1402
1169	putenv ("STATE=down");	1403	putenv ((char *)"STATE=down");
1170		1404
1171	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1405	char *filename;
1172	}	1406	asprintf (&filename,
		1407	"%s/%s",
		1408	confbase,
		1409	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173		1410
		1411	return filename;
		1412	}
		1413
1174	connection::connection(struct vpn *vpn_)	1414	connection::connection (struct vpn *vpn, conf_node *conf)
1175	: vpn(vpn_)	1415	: vpn(vpn), conf(conf),
1176	, rekey (this, &connection::rekey_cb)	1416	#if ENABLE_DNS
1177	, keepalive (this, &connection::keepalive_cb)	1417	dns (0),
		1418	#endif
		1419	data_queue(conf->max_ttl, conf->max_queue + 1),
		1420	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1421	{
		1422	rekey .set<connection, &connection::rekey_cb > (this);
		1423	keepalive .set<connection, &connection::keepalive_cb > (this);
1178	, establish_connection (this, &connection::establish_connection_cb)	1424	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1179	{	1425
		1426	last_establish_attempt = 0.;
1180	octx = ictx = 0;	1427	octx = ictx = 0;
1181	retry_cnt = 0;
1182		1428
1183	connectmode = conf_node::C_ALWAYS; // initial setting	1429	connectmode = conf->connectmode;
		1430
		1431	// queue a dummy packet to force an initial connection attempt
		1432	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1433	vpn_queue.put (new net_packet);
		1434
1184	reset_connection ();	1435	reset_connection ();
1185	}	1436	}
1186		1437
1187	connection::~connection ()	1438	connection::~connection ()
1188	{	1439	{
1189	shutdown ();	1440	shutdown ();
1190	}	1441	}
1191		1442
		1443	void
1192	void connection_init ()	1444	connection_init ()
1193	{	1445	{
1194	auth_rate_limiter.clear ();	1446	auth_rate_limiter.clear ();
1195	reset_rate_limiter.clear ();	1447	reset_rate_limiter.clear ();
1196	}	1448	}
1197		1449

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