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Comparing gvpe/src/connection.C (file contents):
Revision 1.28 by pcg, Tue Jan 27 05:56:35 2004 UTC vs.
Revision 1.99 by root, Wed Jul 17 04:36:03 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	extern "C" {
23	# include "lzf/lzf.h"
24	}
25
26	#include <cassert>
27
28	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
29		37
30	#include <openssl/rand.h>	38	#include <openssl/rand.h>
31	#include <openssl/evp.h>	39	#include <openssl/evp.h>
32	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
33	#include <openssl/err.h>	41	#include <openssl/err.h>
34
35	#include "gettext.h"
36		42
37	#include "conf.h"	43	#include "conf.h"
38	#include "slog.h"	44	#include "slog.h"
39	#include "device.h"	45	#include "device.h"
40	#include "vpn.h"	46	#include "vpn.h"
41	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
42		49
43	#include "netcompat.h"	50	#include "netcompat.h"
44		51
45	#if !HAVE_RAND_PSEUDO_BYTES
46	# define RAND_pseudo_bytes RAND_bytes
47	#endif
48
49	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53
		54	#define ULTRA_FAST 1
		55	#define HLOG 15
		56	#include "lzf/lzf.h"
		57	#include "lzf/lzf_c.c"
		58	#include "lzf/lzf_d.c"
		59
		60	//////////////////////////////////////////////////////////////////////////////
		61
		62	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		63	static ev::child rs_child_ev;
		64
		65	namespace
		66	{
		67	void // c++ requires external linkage here, apparently :(
		68	rs_child_cb (ev::child &w, int revents)
		69	{
		70	w.stop ();
		71
		72	if (rs_queue.empty ())
		73	return;
		74
		75	pid_t pid = run_script (*rs_queue.front ().first, false);
		76	if (pid)
		77	{
		78	w.set (pid);
		79	w.start ();
		80	}
		81	else
		82	slog (L_WARN, rs_queue.front ().second);
		83
		84	delete rs_queue.front ().first;
		85	rs_queue.pop ();
		86	}
		87	};
		88
		89	// despite the fancy name, this is quite a hack
		90	static void
		91	run_script_queued (run_script_cb *cb, const char *warnmsg)
		92	{
		93	rs_queue.push (std::make_pair (cb, warnmsg));
		94
		95	if (!rs_child_ev.is_active ())
		96	{
		97	rs_child_ev.set<rs_child_cb> ();
		98	rs_child_ev ();
		99	}
		100	}
		101
		102	//////////////////////////////////////////////////////////////////////////////
50		103
51	struct crypto_ctx	104	struct crypto_ctx
52	{	105	{
53	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	107	HMAC_CTX hctx;
55		108
56	crypto_ctx (const rsachallenge &challenge, int enc);	109	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	110	~crypto_ctx ();
58	};	111	};
59		112
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	113	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	114	{
		115	ecdh_key s;
		116
		117	curve25519_combine (a, b, s);
		118
		119	{
		120	u8 mac_key[MAC_KEYSIZE];
		121	static const unsigned char mac_info[] = "gvpe mac key";
		122
		123	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		124	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		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 (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
62	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
63	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	147	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	148	}
67		149
68	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
69	{	151	{
70	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
72	}	154	}
73		155
		156	static inline void
		157	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		158	{
		159	if (RSA_public_encrypt (sizeof (auth.rsa),
		160	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		161	key, RSA_PKCS1_OAEP_PADDING) < 0)
		162	fatal ("RSA_public_encrypt error");
		163	}
		164
		165	static inline bool
		166	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		167	{
		168	u8 rsa_decrypt[RSA_KEYLEN];
		169
		170	if (RSA_private_decrypt (sizeof (encr.rsa),
		171	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		172	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		173	return 0;
		174
		175	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		176
		177	return 1;
		178	}
		179
74	static void	180	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	181	auth_hash (const auth_data &auth, auth_mac &mac)
76	{	182	{
77	EVP_MD_CTX ctx;	183	HMAC_CTX ctx;
78		184
79	EVP_MD_CTX_init (&ctx);	185	HMAC_CTX_init (&ctx);
80	EVP_DigestInit (&ctx, RSA_HASH);	186	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
81	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	187	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
82	EVP_DigestUpdate(&ctx, &id, sizeof id);	188	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
83	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
84	EVP_MD_CTX_cleanup (&ctx);	189	HMAC_CTX_cleanup (&ctx);
85	}	190	}
86		191
87	struct rsa_entry {	192	void
88	tstamp expire;	193	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	194	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	195	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
102	{
103	memcpy (&chg, &i->chg, sizeof chg);
104
105	erase (i);
106	return true;
107	}
108	}
109
110	if (cleaner.at < NOW)
111	cleaner.start (NOW + RSA_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	{ }	196	{
		197	// request data
		198	RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		199	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		200	auth_hash (snd_auth, snd_auth_mac);
136		201
137	} rsa_cache;	202	// eventual response data
138		203	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{	204	}
143	w.start (NOW + RSA_TTL);
144		205
145	for (iterator i = begin (); i != end (); )	206	// every use prolongs the expiry
146	if (i->expire <= NOW)	207	auth_expire = ev_now () + AUTH_TTL;
147	i = erase (i);
148	else
149	++i;
150	}
151	}	208	}
152		209
153	//////////////////////////////////////////////////////////////////////////////	210	//////////////////////////////////////////////////////////////////////////////
154		211
155	void pkt_queue::put (net_packet *p)	212	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		213	: max_ttl (max_ttl), max_queue (max_queue)
156	{	214	{
157	if (queue[i])	215	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		216
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;	217	i = 0;
185	j = 0;	218	j = 0;
		219
		220	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	221	}
187		222
188	pkt_queue::~pkt_queue ()	223	pkt_queue::~pkt_queue ()
189	{	224	{
190	for (i = QUEUEDEPTH; --i > 0; )	225	while (net_packet *p = get ())
		226	delete p;
		227
191	delete queue[i];	228	delete [] queue;
192	}	229	}
193		230
		231	void
		232	pkt_queue::expire_cb (ev::timer &w, int revents)
		233	{
		234	ev_tstamp expire = ev_now () - max_ttl;
		235
		236	for (;;)
		237	{
		238	if (empty ())
		239	break;
		240
		241	double diff = queue[j].tstamp - expire;
		242
		243	if (diff >= 0.)
		244	{
		245	w.start (diff > 0.5 ? diff : 0.5);
		246	break;
		247	}
		248
		249	delete get ();
		250	}
		251	}
		252
		253	void
		254	pkt_queue::put (net_packet *p)
		255	{
		256	ev_tstamp now = ev_now ();
		257
		258	// start expiry timer
		259	if (empty ())
		260	expire.start (max_ttl);
		261
		262	int ni = i + 1 == max_queue ? 0 : i + 1;
		263
		264	if (ni == j)
		265	delete get ();
		266
		267	queue[i].pkt = p;
		268	queue[i].tstamp = now;
		269
		270	i = ni;
		271	}
		272
		273	net_packet *
		274	pkt_queue::get ()
		275	{
		276	if (empty ())
		277	return 0;
		278
		279	net_packet *p = queue[j].pkt;
		280	queue[j].pkt = 0;
		281
		282	j = j + 1 == max_queue ? 0 : j + 1;
		283
		284	return p;
		285	}
		286
194	struct net_rateinfo {	287	struct net_rateinfo
		288	{
195	u32 host;	289	u32 host;
196	double pcnt, diff;	290	double pcnt, diff;
197	tstamp last;	291	tstamp last;
198	};	292	};
199		293
200	// only do action once every x seconds per host whole allowing bursts.	294	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	295	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	296	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	297	struct net_rate_limiter : list<net_rateinfo>
204	{	298	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	299	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	300	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	301	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	302	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		303
210	bool can (const sockinfo &si) { return can((u32)si.host); }	304	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	305	bool can (u32 host);
212	};	306	};
213		307
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	308	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		309
		310	bool
216	bool net_rate_limiter::can (u32 host)	311	net_rate_limiter::can (u32 host)
217	{	312	{
218	iterator i;	313	iterator i;
219		314
220	for (i = begin (); i != end (); )	315	for (i = begin (); i != end (); )
221	if (i->host == host)	316	if (i->host == host)
222	break;	317	break;
223	else if (i->last < NOW - EXPIRE)	318	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	319	i = erase (i);
225	else	320	else
226	i++;	321	i++;
227		322
228	if (i == end ())	323	if (i == end ())
229	{	324	{
230	net_rateinfo ri;	325	net_rateinfo ri;
231		326
232	ri.host = host;	327	ri.host = host;
233	ri.pcnt = 1.;	328	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	329	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	330	ri.last = ev_now ();
236		331
237	push_front (ri);	332	push_front (ri);
238		333
239	return true;	334	return true;
240	}	335	}
241	else	336	else
242	{	337	{
243	net_rateinfo ri (*i);	338	net_rateinfo ri (*i);
244	erase (i);	339	erase (i);
245		340
246	ri.pcnt = ri.pcnt * ALPHA;	341	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	342	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		343
249	ri.last = NOW;	344	ri.last = ev_now ();
250		345
251	double dif = ri.diff / ri.pcnt;	346	double dif = ri.diff / ri.pcnt;
252		347
253	bool send = dif > CUTOFF;	348	bool send = dif > NRL_CUTOFF;
254		349
255	if (dif > MAXDIF)	350	if (dif > NRL_MAXDIF)
256	{	351	{
257	ri.pcnt = 1.;	352	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	353	ri.diff = NRL_MAXDIF;
259	}	354	}
260	else if (send)	355	else if (send)
261	ri.pcnt++;	356	ri.pcnt++;
262		357
263	push_front (ri);	358	push_front (ri);
…		…
268		363
269	/////////////////////////////////////////////////////////////////////////////	364	/////////////////////////////////////////////////////////////////////////////
270		365
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	366	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
272		367
		368	void
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	369	hmac_packet::hmac_gen (crypto_ctx *ctx)
274	{	370	{
275	unsigned int xlen;	371	unsigned int xlen;
276		372
277	HMAC_CTX *hctx = &ctx->hctx;	373	HMAC_CTX *hctx = &ctx->hctx;
278		374
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	375	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	376	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
281	len - sizeof (hmac_packet));	377	len - sizeof (hmac_packet)));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	378	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
283	}	379	}
284		380
285	void	381	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	383	{
…		…
296	hmac_gen (ctx);	392	hmac_gen (ctx);
297		393
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return !memcmp (hmac, hmac_digest, HMACLENGTH);
299	}	395	}
300		396
		397	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	399	{
303	type = type_;	400	type = type_;
304		401
305	int src = THISNODE->id;	402	int src = THISNODE->id;
306		403
…		…
311		408
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		411
315	struct vpndata_packet : vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
316	{	421	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	423	}
		424	};
328		425
329	void	426	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	428	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
333	int outl = 0, outl2;	430	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
335		432
336	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
338	u32 cl;
339		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
341	if (cl)	440	if (cl)
342	{	441	{
343	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
344	d = cdata;	443	d = cdata;
345	l = cl + 2;	444	l = cl + 2;
346		445
347	d[0] = cl >> 8;	446	d[0] = cl >> 8;
348	d[1] = cl;	447	d[1] = cl;
		448	}
349	}	449	}
350	#endif	450	#endif
351		451
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
353		453
354	struct {	454	struct {
355	#if RAND_SIZE	455	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
357	#endif	457	#endif
358	u32 seqno;	458	u32 seqno;
359	} datahdr;	459	} datahdr;
360		460
361	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	462	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364	#endif	464	#endif
365		465
366	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	468	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	469	outl += outl2;
370		470
371	EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	472	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	473	(unsigned char *) d, l));
374	outl += outl2;	474	outl += outl2;
375		475
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	476	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	477	outl += outl2;
378		478
379	len = outl + data_hdr_size ();	479	len = outl + data_hdr_size ();
380		480
381	set_hdr (type, dst);	481	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	490	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	491	tap_packet *p = new tap_packet;
392	u8 *d;	492	u8 *d;
393	u32 l = len - data_hdr_size ();	493	u32 l = len - data_hdr_size ();
394		494
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	495	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
396		496
397	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
399		499
400	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
…		…
402	else	502	else
403	#endif	503	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6 - DATAHDR];
405		505
406	/* this overwrites part of the src mac, but we fix that later */	506	/* this overwrites part of the src mac, but we fix that later */
407	EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	508	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	509	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	510	outl += outl2;
411		511
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	512	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	513	outl += outl2;
414		514
415	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	515	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
416		516
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	517	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
442	}	542	}
443	};	543	};
444		544
445	struct config_packet : vpn_packet	545	struct config_packet : vpn_packet
446	{	546	{
447	// actually, hmaclen cannot be checked because the hmac
448	// field comes before this data, so peers with other
449	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
451	u8 flags, challengelen, pad2, pad3;	548	u8 flags, features, pad6, pad7, pad8;
452	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
453
454	const u8 curflags () const
455	{
456	return 0x80
457	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}
459		550
460	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
461	bool chk_config () const;	552	bool chk_config () const;
		553
		554	static u8 get_features ()
		555	{
		556	u8 f = 0;
		557	#if ENABLE_COMPRESSION
		558	f |= FEATURE_COMPRESSION;
		559	#endif
		560	#if ENABLE_ROHC
		561	f |= FEATURE_ROHC;
		562	#endif
		563	#if ENABLE_BRIDGING
		564	f |= FEATURE_BRIDGING;
		565	#endif
		566	return f;
		567	}
462	};	568	};
463		569
		570	void
464	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
465	{	572	{
466	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	575	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	576	flags = 0;
470	flags = curflags ();	577	features = get_features ();
471	challengelen = sizeof (rsachallenge);
472		578
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	579	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	580	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		581	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
476		582
477	len = sizeof (*this) - sizeof (net_packet);	583	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	584	set_hdr (type, dst);
479	}	585	}
480		586
		587	bool
481	bool config_packet::chk_config () const	588	config_packet::chk_config () const
482	{	589	{
483	if (prot_major != PROTOCOL_MAJOR)	590	if (prot_major != PROTOCOL_MAJOR)
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	591	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	592	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	593	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	595	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	596	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
498	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	597	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		598	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		599	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
499	else	600	else
500	return true;	601	return true;
501		602
502	return false;	603	return false;
503	}	604	}
504		605
505	struct auth_req_packet : config_packet	606	struct auth_req_packet : config_packet // UNPROTECTED
506	{	607	{
507	char magic[8];	608	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	609	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will be patched on forward)	610	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	611	u8 pad2, pad3;
511	rsaid id;	612	auth_encr encr;
512	rsaencrdata encr;
513		613
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	614	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	615	{
516	config_packet::setup (PT_AUTH_REQ, dst);	616	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	617	memcpy (magic, MAGIC, 8);
518	initiate = !!initiate_;	618	initiate = !!initiate_;
519	protocols = protocols_;	619	protocols = protocols_;
520		620
521	len = sizeof (*this) - sizeof (net_packet);	621	len = sizeof (*this) - sizeof (net_packet);
522	}	622	}
523	};	623	};
524		624
525	struct auth_res_packet : config_packet	625	struct auth_res_packet : config_packet // UNPROTECTED
526	{	626	{
527	rsaid id;
528	u8 pad1, pad2, pad3;
529	u8 response_len; // encrypted length
530	rsaresponse response;	627	auth_response response;
531		628
532	auth_res_packet (int dst)	629	auth_res_packet (int dst)
533	{	630	{
534	config_packet::setup (PT_AUTH_RES, dst);	631	config_packet::setup (PT_AUTH_RES, dst);
535		632
…		…
569	};	666	};
570		667
571	/////////////////////////////////////////////////////////////////////////////	668	/////////////////////////////////////////////////////////////////////////////
572		669
573	void	670	void
574	connection::connection_established ()	671	connection::connection_established (const sockinfo &rsi)
575	{	672	{
		673	if (!have_snd_auth || !have_rcv_auth)
		674	return;
		675
		676	si = rsi;
		677	protocol = rsi.prot;
		678
		679	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		680	conf->nodename, (const char *)rsi,
		681	is_direct ? "direct" : "forwarded",
		682	PROTOCOL_MAJOR, prot_minor);
		683
		684	if (::conf.script_node_up)
		685	{
		686	run_script_cb *cb = new run_script_cb;
		687	cb->set<connection, &connection::script_node_up> (this);
		688	run_script_queued (cb, _("node-up command execution failed, continuing."));
		689	}
		690
		691	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		692	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		693
		694	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		695	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		696
576	if (ictx && octx)	697	if (ictx && octx)
577	{	698	{
578	connectmode = conf->connectmode;	699	// make sure rekeying timeouts are slightly asymmetric
		700	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		701	rekey.start (rekey_interval, rekey_interval);
579		702
580	rekey.start (NOW + ::conf.rekey);
581	keepalive.start (NOW + ::conf.keepalive);	703	keepalive.start (::conf.keepalive);
582		704
583	// send queued packets	705	// send queued packets
584	if (ictx && octx)	706	if (ictx && octx)
585	{	707	{
586	while (tap_packet *p = (tap_packet *)data_queue.get ())	708	while (tap_packet *p = (tap_packet *)data_queue.get ())
587	{	709	{
588	send_data_packet (p);	710	if (p->len) send_data_packet (p);
589	delete p;	711	delete p;
590	}	712	}
591		713
592	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	714	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593	{	715	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	716	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	717	delete p;
596	}	718	}
597	}	719	}
		720
		721	vpn->connection_established (this);
598	}	722	}
		723	#if 0
599	else	724	else
600	{	725	{
601	retry_cnt = 0;	726	retry_cnt = 0;
602	establish_connection.start (NOW + 5);	727	establish_connection.start (5);
603	keepalive.stop ();	728	keepalive.stop ();
604	rekey.stop ();	729	rekey.stop ();
605	}	730	}
		731	#endif
606	}	732	}
607		733
608	void	734	void
609	connection::reset_si ()	735	connection::reset_si ()
610	{	736	{
		737	if (vpn->can_direct (THISNODE, conf))
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);	738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
612		739	else
613	// mask out protocols we cannot establish	740	{
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	742	protocol = 0;
		743	}
616		744
617	si.set (conf, protocol);	745	si.set (conf, protocol);
		746
		747	is_direct = si.valid ();
618	}	748	}
619		749
620	// ensure sockinfo is valid, forward if necessary	750	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	751	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	752	connection::forward_si (const sockinfo &si) const
623	{	753	{
624	if (!si.valid ())	754	if (!si.valid ())
625	{	755	{
626	connection *r = vpn->find_router ();	756	connection *r = vpn->find_router_for (this);
627		757
628	if (r)	758	if (r)
629	{	759	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	760	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	761	conf->nodename, r->conf->nodename);
632	return r->si;	762	return r->si;
633	}	763	}
634	else	764	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	765	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	766	conf->nodename);
637	}	767	}
638		768
639	return si;	769	return si;
640	}	770	}
…		…
650	connection::send_ping (const sockinfo &si, u8 pong)	780	connection::send_ping (const sockinfo &si, u8 pong)
651	{	781	{
652	ping_packet *pkt = new ping_packet;	782	ping_packet *pkt = new ping_packet;
653		783
654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	784	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		785
		786	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	787	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		788
657	delete pkt;	789	delete pkt;
658	}	790	}
659		791
…		…
674	void	806	void
675	connection::send_auth_request (const sockinfo &si, bool initiate)	807	connection::send_auth_request (const sockinfo &si, bool initiate)
676	{	808	{
677	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	809	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
678		810
679	rsachallenge chg;	811	generate_auth_data ();
680	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	812	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
682		813
683	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
684
685	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
686		816
687	delete pkt;	817	delete pkt;
688	}	818	}
689		819
690	void	820	void
691	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	821	connection::send_auth_response (const sockinfo &si)
692	{	822	{
693	auth_res_packet *pkt = new auth_res_packet (conf->id);	823	auth_res_packet *pkt = new auth_res_packet (conf->id);
694		824
695	pkt->id = id;	825	auth_hash (rcv_auth, pkt->response.mac);
		826	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
696		827
697	rsa_hash (id, chg, pkt->response);
698
699	pkt->hmac_set (octx);
700
701	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	828	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702
703	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		830
705	delete pkt;	831	delete pkt;
706	}	832	}
707		833
708	void	834	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	836	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
713		840
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		842
716	r->hmac_set (octx);	843	r->hmac_set (octx);
717	send_vpn_packet (r, si);	844	send_vpn_packet (r, si);
718		845
719	delete r;	846	delete r;
720	}	847	}
721		848
722	void	849	inline void
723	connection::establish_connection_cb (time_watcher &w)	850	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	851	{
725	if (!ictx	852	if (!(ictx && octx)
726	&& conf != THISNODE	853	&& conf != THISNODE
727	&& connectmode != conf_node::C_NEVER	854	&& connectmode != conf_node::C_NEVER
728	&& connectmode != conf_node::C_DISABLED	855	&& connectmode != conf_node::C_DISABLED
729	&& NOW > w.at)	856	&& !w.is_active ())
730	{	857	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		859	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		861	{
		862	reset_connection ();
734	retry_cnt++;	863	return;
		864	}
735		865
736	w.start (NOW + retry_int);	866	last_establish_attempt = ev_now ();
		867
		868	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		869	? (retry_cnt & 3) + 1
		870	: 1 << (retry_cnt >> 2));
737		871
738	reset_si ();	872	reset_si ();
739		873
740	if (si.prot && !si.host)	874	bool slow = si.prot & PROT_SLOW;
		875
		876	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		877	{
		878	/*TODO*/ /* start the timer so we don't recurse endlessly */
		879	w.start (1);
741	vpn->send_connect_request (conf->id);	880	vpn->send_connect_request (this);
		881	}
742	else	882	else
743	{	883	{
		884	if (si.valid ())
		885	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		886	conf->nodename, (const char *)si);
		887
744	const sockinfo &dsi = forward_si (si);	888	const sockinfo &dsi = forward_si (si);
		889
		890	slow = slow || (dsi.prot & PROT_SLOW);
745		891
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	892	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	893	{
748	if (retry_cnt < 4)	894	if (retry_cnt < 4)
749	send_auth_request (dsi, true);	895	send_auth_request (dsi, true);
750	else	896	else
751	send_ping (dsi, 0);	897	send_ping (dsi, 0);
752	}	898	}
753	}	899	}
		900
		901	retry_int *= slow ? 8. : 0.9;
		902
		903	if (retry_int < conf->max_retry)
		904	retry_cnt++;
		905	else
		906	retry_int = conf->max_retry;
		907
		908	w.start (retry_int);
754	}	909	}
755	}	910	}
756		911
757	void	912	void
758	connection::reset_connection ()	913	connection::reset_connection ()
…		…
761	{	916	{
762	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
763	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
764		919
765	if (::conf.script_node_down)	920	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	921	{
		922	run_script_cb *cb = new run_script_cb;
		923	cb->set<connection, &connection::script_node_down> (this);
		924	run_script_queued (cb, _("node-down command execution failed, continuing."));
		925	}
767	}	926	}
768		927
769	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
770	delete octx; octx = 0;	929	delete octx; octx = 0;
771		930
772	si.host= 0;	931	si.host = 0;
773		932
		933	have_snd_auth = false;
		934	have_rcv_auth = false;
		935	auth_expire = 0.;
		936
774	last_activity = 0;	937	last_activity = 0.;
		938	//last_si_change = 0.;
775	retry_cnt = 0;	939	retry_cnt = 0;
776		940
777	rekey.stop ();	941	rekey.stop ();
778	keepalive.stop ();	942	keepalive.stop ();
779	establish_connection.stop ();	943	establish_connection.stop ();
…		…
786	send_reset (si);	950	send_reset (si);
787		951
788	reset_connection ();	952	reset_connection ();
789	}	953	}
790		954
791	void	955	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	956	inline void
		957	connection::rekey_cb (ev::timer &w, int revents)
793	{	958	{
794	reset_connection ();	959	reset_connection ();
795	establish_connection ();	960	establish_connection ();
796	}	961	}
797		962
…		…
813	if (oseqno > MAX_SEQNO)	978	if (oseqno > MAX_SEQNO)
814	rekey ();	979	rekey ();
815	}	980	}
816		981
817	void	982	void
		983	connection::post_inject_queue ()
		984	{
		985	// force a connection every now and when when packets are sent (max 1/s)
		986	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		987	establish_connection.stop ();
		988
		989	establish_connection ();
		990	}
		991
		992	void
818	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	993	connection::inject_data_packet (tap_packet *pkt)
819	{	994	{
820	if (ictx && octx)	995	if (ictx && octx)
821	send_data_packet (pkt);	996	send_data_packet (pkt);
822	else	997	else
823	{	998	{
824	if (!broadcast)//DDDD
825	data_queue.put (new tap_packet (*pkt));	999	data_queue.put (new tap_packet (*pkt));
826		1000	post_inject_queue ();
827	establish_connection ();
828	}	1001	}
829	}	1002	}
830		1003
		1004	void
831	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1005	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832	{	1006	{
833	if (ictx && octx)	1007	if (ictx && octx)
834	send_vpn_packet (pkt, si, tos);	1008	send_vpn_packet (pkt, si, tos);
835	else	1009	else
836	{	1010	{
837	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1011	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
838		1012	post_inject_queue ();
839	establish_connection ();
840	}	1013	}
841	}	1014	}
842		1015
843	void	1016	void
844	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1017	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845	{	1018	{
846	last_activity = NOW;	1019	last_activity = ev_now ();
847		1020
848	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1021	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
849	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1022	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1023
		1024	if (connectmode == conf_node::C_DISABLED)
		1025	return;
850		1026
851	switch (pkt->typ ())	1027	switch (pkt->typ ())
852	{	1028	{
853	case vpn_packet::PT_PING:	1029	case vpn_packet::PT_PING:
		1030	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1031
854	// we send pings instead of auth packets after some retries,	1032	// we send pings instead of auth packets after some retries,
855	// so reset the retry counter and establish a connection	1033	// so reset the retry counter and establish a connection
856	// when we receive a ping.	1034	// when we receive a ping.
857	if (!ictx)	1035	if (!ictx)
858	{	1036	{
859	if (auth_rate_limiter.can (rsi))	1037	if (auth_rate_limiter.can (rsi))
860	send_auth_request (rsi, true);	1038	send_auth_request (rsi, true);
861	}	1039	}
862	else	1040	else
		1041	// we would love to change the socket address here, but ping's aren't
		1042	// authenticated, so we best ignore it.
863	send_ping (rsi, 1); // pong	1043	send_ping (rsi, 1); // pong
864		1044
865	break;	1045	break;
866		1046
867	case vpn_packet::PT_PONG:	1047	case vpn_packet::PT_PONG:
		1048	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1049
		1050	// a PONG might mean that the other side doesn't really know
		1051	// about our desire for communication.
		1052	establish_connection ();
868	break;	1053	break;
869		1054
870	case vpn_packet::PT_RESET:	1055	case vpn_packet::PT_RESET:
871	{	1056	{
872	reset_connection ();	1057	reset_connection ();
873		1058
874	config_packet *p = (config_packet *) pkt;	1059	config_packet *p = (config_packet *) pkt;
875		1060
876	if (!p->chk_config ())	1061	if (!p->chk_config ())
877	{	1062	{
878	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1063	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
879	conf->nodename, (const char *)rsi);	1064	conf->nodename, (const char *)rsi);
880	connectmode = conf_node::C_DISABLED;	1065	connectmode = conf_node::C_DISABLED;
881	}	1066	}
882	else if (connectmode == conf_node::C_ALWAYS)	1067	else if (connectmode == conf_node::C_ALWAYS)
883	establish_connection ();	1068	establish_connection ();
…		…
885	break;	1070	break;
886		1071
887	case vpn_packet::PT_AUTH_REQ:	1072	case vpn_packet::PT_AUTH_REQ:
888	if (auth_rate_limiter.can (rsi))	1073	if (auth_rate_limiter.can (rsi))
889	{	1074	{
890	auth_req_packet *p = (auth_req_packet *) pkt;	1075	auth_req_packet *p = (auth_req_packet *)pkt;
891		1076
892	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1077	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1078	conf->nodename, p->initiate ? "initiate" : "reply",
		1079	p->protocols, p->features);
893		1080
894	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1081	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
895	{	1082	{
896	if (p->prot_minor != PROTOCOL_MINOR)	1083	if (p->prot_minor != PROTOCOL_MINOR)
897	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1084	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
898	conf->nodename, (const char *)rsi,	1085	conf->nodename, (const char *)rsi,
899	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1086	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
900		1087
901	if (p->initiate)	1088	if (p->initiate)
902	send_auth_request (rsi, false);	1089	send_auth_request (rsi, false);
903		1090
904	rsachallenge k;	1091	auth_data auth;
905		1092
906	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1093	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
907	{	1094	{
908	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1095	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
909	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1096	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
910	break;
911	}	1097	}
912	else	1098	else
913	{	1099	{
914	delete octx;	1100	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
915		1101
916	octx = new crypto_ctx (k, 1);	1102	rcv_auth = auth;
917	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1103	have_rcv_auth = true;
918		1104
		1105	send_auth_response (rsi);
		1106
		1107	if (chg)
		1108	{
919	conf->protocols = p->protocols;	1109	conf->protocols = p->protocols;
		1110	features = p->features & config_packet::get_features ();
920		1111
921	send_auth_response (rsi, p->id, k);
922
923	connection_established ();	1112	connection_established (rsi);
924
925	break;	1113	}
926	}	1114	}
		1115
		1116	break;
927	}	1117	}
928	else	1118	else
929	slog (L_WARN, _("%s(%s): protocol mismatch"),	1119	slog (L_WARN, _("%s(%s): protocol mismatch."),
930	conf->nodename, (const char *)rsi);	1120	conf->nodename, (const char *)rsi);
931		1121
932	send_reset (rsi);	1122	send_reset (rsi);
933	}	1123	}
934		1124
935	break;	1125	break;
936		1126
937	case vpn_packet::PT_AUTH_RES:	1127	case vpn_packet::PT_AUTH_RES:
938	{	1128	{
939	auth_res_packet *p = (auth_res_packet *) pkt;	1129	auth_res_packet *p = (auth_res_packet *)pkt;
940		1130
941	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1131	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942		1132
943	if (p->chk_config ())	1133	if (p->chk_config ())
944	{	1134	{
945	if (p->prot_minor != PROTOCOL_MINOR)	1135	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
946	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
947	conf->nodename, (const char *)rsi,
948	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
949
950	rsachallenge chg;
951
952	if (!rsa_cache.find (p->id, chg))
953	{	1136	{
954	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1137	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
955	conf->nodename, (const char *)rsi);	1138	conf->nodename, (const char *)rsi);
956	break;
957	}	1139	}
958	else	1140	else if (!have_snd_auth)
959	{	1141	{
960	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1142	if (p->prot_minor != PROTOCOL_MINOR)
961		1143	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
962	if (!p->hmac_chk (cctx))
963	{
964	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
965	"could be an attack, or just corruption or a synchronization error"),
966	conf->nodename, (const char *)rsi);	1144	conf->nodename, (const char *)rsi,
967	break;	1145	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
968	}
969	else
970	{
971	rsaresponse h;
972		1146
973	rsa_hash (p->id, chg, h);
974
975	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
976	{
977	prot_minor = p->prot_minor;	1147	prot_minor = p->prot_minor;
		1148	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
978		1149
979	delete ictx; ictx = cctx;	1150	have_snd_auth = true;
980
981	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
982
983	si = rsi;
984	protocol = rsi.prot;
985
986	connection_established ();	1151	connection_established (rsi);
987
988	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
989	conf->nodename, (const char *)rsi,
990	p->prot_major, p->prot_minor);
991
992	if (::conf.script_node_up)
993	run_script (run_script_cb (this, &connection::script_node_up), false);
994
995	break;
996	}
997	else
998	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
999	conf->nodename, (const char *)rsi);
1000	}
1001
1002	delete cctx;
1003	}	1152	}
		1153
		1154	break;
1004	}	1155	}
1005	}	1156	}
1006		1157
1007	send_reset (rsi);	1158	send_reset (rsi);
1008	break;	1159	break;
…		…
1019	{	1170	{
1020	vpndata_packet *p = (vpndata_packet *)pkt;	1171	vpndata_packet *p = (vpndata_packet *)pkt;
1021		1172
1022	if (!p->hmac_chk (ictx))	1173	if (!p->hmac_chk (ictx))
1023	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1174	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1024	"could be an attack, or just corruption or a synchronization error"),	1175	"could be an attack, or just corruption or a synchronization error."),
1025	conf->nodename, (const char *)rsi);	1176	conf->nodename, (const char *)rsi);
1026	else	1177	else
1027	{	1178	{
1028	u32 seqno;	1179	u32 seqno;
1029	tap_packet *d = p->unpack (this, seqno);	1180	tap_packet *d = p->unpack (this, seqno);
		1181	int seqclass = iseqno.seqno_classify (seqno);
1030		1182
1031	if (iseqno.recv_ok (seqno))	1183	if (seqclass == 0) // ok
1032	{	1184	{
1033	vpn->tap->send (d);	1185	vpn->tap->send (d);
1034		1186
1035	if (si != rsi)	1187	if (si != rsi)
1036	{	1188	{
1037	// fast re-sync on connection changes, useful especially for tcp/ip	1189	// fast re-sync on source address changes, useful especially for tcp/ip
		1190	//if (last_si_change < ev_now () + 5.)
1038	si = rsi;	1191	// {
1039
1040	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1192	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041	conf->nodename, (const char *)si, (const char *)rsi);	1193	conf->nodename, (const char *)si, (const char *)rsi);
		1194
		1195	si = rsi;
		1196
		1197	if (::conf.script_node_change)
		1198	{
		1199	run_script_cb *cb = new run_script_cb;
		1200	cb->set<connection, &connection::script_node_change> (this);
		1201	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1202	}
		1203
		1204	// }
		1205	//else
		1206	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1207	// conf->nodename, (const char *)si, (const char *)rsi);
1042	}	1208	}
1043
1044	delete d;
1045
1046	break;
1047	}	1209	}
		1210	else if (seqclass == 1) // far history
		1211	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1214	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 3) // reset
		1217	{
		1218	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1219	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1220	send_reset (rsi);
		1221	}
		1222
		1223	delete d;
		1224	break;
1048	}	1225	}
1049	}	1226	}
1050		1227
1051	send_reset (rsi);	1228	send_reset (rsi);
1052	break;	1229	break;
1053		1230
1054	case vpn_packet::PT_CONNECT_REQ:	1231	case vpn_packet::PT_CONNECT_REQ:
1055	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1232	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056	{	1233	{
1057	connect_req_packet *p = (connect_req_packet *) pkt;	1234	connect_req_packet *p = (connect_req_packet *)pkt;
1058		1235
1059	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1236	if (p->id > 0 && p->id <= vpn->conns.size ())
1060	connection *c = vpn->conns[p->id - 1];
1061	conf->protocols = p->protocols;
1062
1063	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1064	conf->id, p->id, c->ictx && c->octx);
1065
1066	if (c->ictx && c->octx)
1067	{	1237	{
		1238	connection *c = vpn->conns[p->id - 1];
		1239	conf->protocols = p->protocols;
		1240
		1241	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1242	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1243	p->protocols,
		1244	c->ictx && c->octx);
		1245
		1246	if (c->ictx && c->octx)
		1247	{
1068	// send connect_info packets to both sides, in case one is	1248	// send connect_info packets to both sides, in case one is
1069	// behind a nat firewall (or both ;)	1249	// behind a nat firewall (or both ;)
1070	c->send_connect_info (conf->id, si, conf->protocols);	1250	c->send_connect_info (conf->id, si, conf->protocols);
1071	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1251	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1252	}
		1253	else
		1254	c->establish_connection ();
1072	}	1255	}
1073	else	1256	else
1074	c->establish_connection ();	1257	slog (L_WARN,
		1258	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1259	p->id);
1075	}	1260	}
1076		1261
1077	break;	1262	break;
1078		1263
1079	case vpn_packet::PT_CONNECT_INFO:	1264	case vpn_packet::PT_CONNECT_INFO:
1080	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1265	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081	{	1266	{
1082	connect_info_packet *p = (connect_info_packet *) pkt;	1267	connect_info_packet *p = (connect_info_packet *)pkt;
1083		1268
1084	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1269	if (p->id > 0 && p->id <= vpn->conns.size ())
1085		1270	{
1086	connection *c = vpn->conns[p->id - 1];	1271	connection *c = vpn->conns[p->id - 1];
1087		1272
1088	c->conf->protocols = p->protocols;	1273	c->conf->protocols = p->protocols;
1089	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1274	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1090	p->si.upgrade_protocol (protocol, c->conf);	1275	p->si.upgrade_protocol (protocol, c->conf);
1091		1276
1092	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1277	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1093	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1278	conf->nodename,
		1279	vpn->conns[p->id - 1]->conf->nodename,
		1280	(const char *)p->si,
		1281	p->protocols,
		1282	protocol,
		1283	p->si.supported_protocols (c->conf),
		1284	!c->ictx && !c->octx);
1094		1285
1095	const sockinfo &dsi = forward_si (p->si);	1286	const sockinfo &dsi = forward_si (p->si);
1096		1287
1097	if (dsi.valid ())	1288	if (dsi.valid ())
1098	c->send_auth_request (dsi, true);	1289	c->send_auth_request (dsi, true);
		1290	else
		1291	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si);
		1294	}
		1295	else
		1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
1099	}	1299	}
1100		1300
1101	break;	1301	break;
1102		1302
1103	default:	1303	default:
1104	send_reset (rsi);	1304	send_reset (rsi);
1105	break;	1305	break;
1106	}	1306	}
1107	}	1307	}
1108		1308
1109	void connection::keepalive_cb (time_watcher &w)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1110	{	1311	{
1111	if (NOW >= last_activity + ::conf.keepalive + 30)	1312	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1313
		1314	if (when >= 0)
		1315	w.start (when);
		1316	else if (when < -15)
1112	{	1317	{
1113	reset_connection ();	1318	reset_connection ();
1114	establish_connection ();	1319	establish_connection ();
1115	}	1320	}
1116	else if (NOW < last_activity + ::conf.keepalive)
1117	w.start (last_activity + ::conf.keepalive);
1118	else if (conf->connectmode != conf_node::C_ONDEMAND	1321	else if (conf->connectmode != conf_node::C_ONDEMAND
1119	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1322	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1120	{	1323	{
		1324	w.start (3);
1121	send_ping (si);	1325	send_ping (si);
1122	w.start (NOW + 5);
1123	}	1326	}
1124	else if (NOW < last_activity + ::conf.keepalive + 10)	1327	else if (when >= -10)
1125	// hold ondemand connections implicitly a few seconds longer	1328	// hold ondemand connections implicitly a few seconds longer
1126	// should delete octx, though, or something like that ;)	1329	// should delete octx, though, or something like that ;)
1127	w.start (last_activity + ::conf.keepalive + 10);	1330	w.start (when + 10);
1128	else	1331	else
1129	reset_connection ();	1332	reset_connection ();
1130	}	1333	}
1131		1334
		1335	void
1132	void connection::send_connect_request (int id)	1336	connection::send_connect_request (int id)
1133	{	1337	{
1134	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1338	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1135		1339
1136	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1340	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1341	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1342	THISNODE->protocols);
1137	p->hmac_set (octx);	1343	p->hmac_set (octx);
1138	send_vpn_packet (p, si);	1344	send_vpn_packet (p, si);
1139		1345
1140	delete p;	1346	delete p;
1141	}	1347	}
1142		1348
1143	void connection::script_node ()	1349	void
		1350	connection::script_init_env (const char *ext)
1144	{	1351	{
1145	vpn->script_if_up ();
1146
1147	char *env;	1352	char *env;
		1353	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1354	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1355	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1356	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1357	conf->id & 0xff); putenv (env);
		1358	}
		1359
		1360	void
		1361	connection::script_init_connect_env ()
		1362	{
		1363	vpn->script_init_env ();
		1364
		1365	char *env;
1148	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1366	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1367	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1149	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1368	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1369	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1370	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152	}	1371	}
1153		1372
		1373	inline const char *
1154	const char *connection::script_node_up ()	1374	connection::script_node_up ()
1155	{	1375	{
1156	script_node ();	1376	script_init_connect_env ();
1157		1377
1158	putenv ("STATE=up");	1378	putenv ((char *)"STATE=up");
1159		1379
		1380	char *filename;
		1381	asprintf (&filename,
		1382	"%s/%s",
		1383	confbase,
1160	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1384	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161	}
1162		1385
		1386	return filename;
		1387	}
		1388
		1389	inline const char *
		1390	connection::script_node_change ()
		1391	{
		1392	script_init_connect_env ();
		1393
		1394	putenv ((char *)"STATE=change");
		1395
		1396	char *filename;
		1397	asprintf (&filename,
		1398	"%s/%s",
		1399	confbase,
		1400	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1401
		1402	return filename;
		1403	}
		1404
		1405	inline const char *
1163	const char *connection::script_node_down ()	1406	connection::script_node_down ()
1164	{	1407	{
1165	script_node ();	1408	script_init_connect_env ();
1166		1409
1167	putenv ("STATE=down");	1410	putenv ((char *)"STATE=down");
1168		1411
1169	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1412	char *filename;
1170	}	1413	asprintf (&filename,
		1414	"%s/%s",
		1415	confbase,
		1416	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171		1417
		1418	return filename;
		1419	}
		1420
1172	connection::connection(struct vpn *vpn_)	1421	connection::connection (struct vpn *vpn, conf_node *conf)
1173	: vpn(vpn_)	1422	: vpn(vpn), conf(conf),
1174	, rekey (this, &connection::rekey_cb)	1423	#if ENABLE_DNS
1175	, keepalive (this, &connection::keepalive_cb)	1424	dns (0),
		1425	#endif
		1426	data_queue(conf->max_ttl, conf->max_queue + 1),
		1427	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1428	{
		1429	rekey .set<connection, &connection::rekey_cb > (this);
		1430	keepalive .set<connection, &connection::keepalive_cb > (this);
1176	, establish_connection (this, &connection::establish_connection_cb)	1431	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177	{	1432
		1433	last_establish_attempt = 0.;
1178	octx = ictx = 0;	1434	octx = ictx = 0;
1179	retry_cnt = 0;
1180		1435
1181	connectmode = conf_node::C_ALWAYS; // initial setting	1436	connectmode = conf->connectmode;
		1437
		1438	// queue a dummy packet to force an initial connection attempt
		1439	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1440	vpn_queue.put (new net_packet);
		1441
1182	reset_connection ();	1442	reset_connection ();
1183	}	1443	}
1184		1444
1185	connection::~connection ()	1445	connection::~connection ()
1186	{	1446	{
1187	shutdown ();	1447	shutdown ();
1188	}	1448	}
1189		1449
		1450	void
1190	void connection_init ()	1451	connection_init ()
1191	{	1452	{
1192	auth_rate_limiter.clear ();	1453	auth_rate_limiter.clear ();
1193	reset_rate_limiter.clear ();	1454	reset_rate_limiter.clear ();
1194	}	1455	}
1195		1456

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