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Comparing gvpe/src/connection.C (file contents):
Revision 1.26 by pcg, Sat Jan 17 14:08:57 2004 UTC vs.
Revision 1.101 by root, Wed Jul 17 16:40:57 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	#define MAGIC "PORN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		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	//////////////////////////////////////////////////////////////////////////////
50		104
51	struct crypto_ctx	105	struct crypto_ctx
52	{	106	{
53	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	108	HMAC_CTX hctx;
55		109
56	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	111	~crypto_ctx ();
58	};	112	};
59		113
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		126	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		127	kdf.extract (s, sizeof (s));
		128	kdf.extract_done (HKDF_PRF_HASH ());
		129	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		130
		131	HMAC_CTX_init (&hctx);
		132	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		141	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		142	kdf.extract (s, sizeof (s));
		143	kdf.extract_done (HKDF_PRF_HASH ());
		144	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		145
62	EVP_CIPHER_CTX_init (&cctx);	146	EVP_CIPHER_CTX_init (&cctx);
63	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	147	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	148	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	149	}
67		150
68	crypto_ctx::~crypto_ctx ()	151	crypto_ctx::~crypto_ctx ()
69	{	152	{
70	EVP_CIPHER_CTX_cleanup (&cctx);	153	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	154	HMAC_CTX_cleanup (&hctx);
72	}	155	}
73		156
		157	static inline void
		158	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		159	{
		160	if (RSA_public_encrypt (sizeof (auth.rsa),
		161	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		162	key, RSA_PKCS1_OAEP_PADDING) < 0)
		163	fatal ("RSA_public_encrypt error");
		164
		165	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		166	}
		167
		168	static inline bool
		169	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		170	{
		171	u8 rsa_decrypt[RSA_KEYLEN];
		172
		173	if (RSA_private_decrypt (sizeof (encr.rsa),
		174	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		175	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		176	return 0;
		177
		178	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		179	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		180
		181	return 1;
		182	}
		183
74	static void	184	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	185	auth_hash (const auth_data &auth, auth_mac &mac)
76	{	186	{
77	EVP_MD_CTX ctx;	187	HMAC_CTX ctx;
78		188
79	EVP_MD_CTX_init (&ctx);	189	HMAC_CTX_init (&ctx);
80	EVP_DigestInit (&ctx, RSA_HASH);	190	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
81	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	191	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
82	EVP_DigestUpdate(&ctx, &id, sizeof id);	192	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
83	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
84	EVP_MD_CTX_cleanup (&ctx);	193	HMAC_CTX_cleanup (&ctx);
85	}	194	}
86		195
87	struct rsa_entry {	196	void
88	tstamp expire;	197	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	198	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	199	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	{ }	200	{
		201	// request data
		202	rand_fill (snd_auth.rsa);
		203	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		204	auth_hash (snd_auth, snd_auth_mac);
136		205
137	} rsa_cache;	206	// eventual response data
138		207	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{	208	}
143	w.start (NOW + RSA_TTL);
144		209
145	for (iterator i = begin (); i != end (); )	210	// every use prolongs the expiry
146	if (i->expire <= NOW)	211	auth_expire = ev_now () + AUTH_TTL;
147	i = erase (i);
148	else
149	++i;
150	}
151	}	212	}
152		213
153	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
154		215
155	void pkt_queue::put (net_packet *p)	216	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		217	: max_ttl (max_ttl), max_queue (max_queue)
156	{	218	{
157	if (queue[i])	219	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		220
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;	221	i = 0;
185	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	225	}
187		226
188	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
189	{	228	{
190	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
191	delete queue[i];	232	delete [] queue;
192	}	233	}
193		234
		235	void
		236	pkt_queue::expire_cb (ev::timer &w, int revents)
		237	{
		238	ev_tstamp expire = ev_now () - max_ttl;
		239
		240	for (;;)
		241	{
		242	if (empty ())
		243	break;
		244
		245	double diff = queue[j].tstamp - expire;
		246
		247	if (diff >= 0.)
		248	{
		249	w.start (diff > 0.5 ? diff : 0.5);
		250	break;
		251	}
		252
		253	delete get ();
		254	}
		255	}
		256
		257	void
		258	pkt_queue::put (net_packet *p)
		259	{
		260	ev_tstamp now = ev_now ();
		261
		262	// start expiry timer
		263	if (empty ())
		264	expire.start (max_ttl);
		265
		266	int ni = i + 1 == max_queue ? 0 : i + 1;
		267
		268	if (ni == j)
		269	delete get ();
		270
		271	queue[i].pkt = p;
		272	queue[i].tstamp = now;
		273
		274	i = ni;
		275	}
		276
		277	net_packet *
		278	pkt_queue::get ()
		279	{
		280	if (empty ())
		281	return 0;
		282
		283	net_packet *p = queue[j].pkt;
		284	queue[j].pkt = 0;
		285
		286	j = j + 1 == max_queue ? 0 : j + 1;
		287
		288	return p;
		289	}
		290
194	struct net_rateinfo {	291	struct net_rateinfo
		292	{
195	u32 host;	293	u32 host;
196	double pcnt, diff;	294	double pcnt, diff;
197	tstamp last;	295	tstamp last;
198	};	296	};
199		297
200	// only do action once every x seconds per host whole allowing bursts.	298	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	299	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	300	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	301	struct net_rate_limiter : list<net_rateinfo>
204	{	302	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	303	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	304	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	305	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	306	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		307
210	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	309	bool can (u32 host);
212	};	310	};
213		311
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		313
		314	bool
216	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
217	{	316	{
218	iterator i;	317	iterator i;
219		318
220	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
221	if (i->host == host)	320	if (i->host == host)
222	break;	321	break;
223	else if (i->last < NOW - EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	323	i = erase (i);
225	else	324	else
226	i++;	325	i++;
227		326
228	if (i == end ())	327	if (i == end ())
229	{	328	{
230	net_rateinfo ri;	329	net_rateinfo ri;
231		330
232	ri.host = host;	331	ri.host = host;
233	ri.pcnt = 1.;	332	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	333	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	334	ri.last = ev_now ();
236		335
237	push_front (ri);	336	push_front (ri);
238		337
239	return true;	338	return true;
240	}	339	}
241	else	340	else
242	{	341	{
243	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
244	erase (i);	343	erase (i);
245		344
246	ri.pcnt = ri.pcnt * ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		347
249	ri.last = NOW;	348	ri.last = ev_now ();
250		349
251	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
252		351
253	bool send = dif > CUTOFF;	352	bool send = dif > NRL_CUTOFF;
254		353
255	if (dif > MAXDIF)	354	if (dif > NRL_MAXDIF)
256	{	355	{
257	ri.pcnt = 1.;	356	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	357	ri.diff = NRL_MAXDIF;
259	}	358	}
260	else if (send)	359	else if (send)
261	ri.pcnt++;	360	ri.pcnt++;
262		361
263	push_front (ri);	362	push_front (ri);
…		…
268		367
269	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
270		369
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
272		371
		372	void
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
274	{	374	{
275	unsigned int xlen;	375	unsigned int xlen;
276		376
277	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
278		378
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	379	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	380	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
281	len - sizeof (hmac_packet));	381	len - sizeof (hmac_packet)));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	382	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
283	}	383	}
284		384
285	void	385	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	386	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	387	{
…		…
296	hmac_gen (ctx);	396	hmac_gen (ctx);
297		397
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
299	}	399	}
300		400
		401	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	403	{
303	type = type_;	404	type = type_;
304		405
305	int src = THISNODE->id;	406	int src = THISNODE->id;
306		407
…		…
310	}	411	}
311		412
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		415
315	struct vpndata_packet:vpn_packet	416	struct vpndata_packet : vpn_packet
		417	{
		418	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		419
		420	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		421	tap_packet *unpack (connection *conn, u32 &seqno);
		422
		423	private:
		424	const u32 data_hdr_size () const
316	{	425	{
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;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	427	}
		428	};
328		429
329	void	430	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	431	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	432	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
333	int outl = 0, outl2;	434	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
335		436
336	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
338	u32 cl;
339		439
		440	if (conn->features & FEATURE_COMPRESSION)
		441	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		443
341	if (cl)	444	if (cl)
342	{	445	{
343	type = PT_DATA_COMPRESSED;	446	type = PT_DATA_COMPRESSED;
344	d = cdata;	447	d = cdata;
345	l = cl + 2;	448	l = cl + 2;
346		449
347	d[0] = cl >> 8;	450	d[0] = cl >> 8;
348	d[1] = cl;	451	d[1] = cl;
		452	}
349	}	453	}
350	#endif	454	#endif
351		455
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	456	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
353		457
354	struct {	458	struct {
355	#if RAND_SIZE	459	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	460	u8 rnd[RAND_SIZE];
357	#endif	461	#endif
358	u32 seqno;	462	u32 seqno;
359	} datahdr;	463	} datahdr;
360		464
361	datahdr.seqno = ntohl (seqno);	465	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	466	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	467	require (RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE) >= 0);
364	#endif	468	#endif
365		469
366	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	473	outl += outl2;
370		474
371	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	477	(unsigned char *) d, l));
374	outl += outl2;	478	outl += outl2;
375		479
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	481	outl += outl2;
378		482
379	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
380		484
381	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	494	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
392	u8 *d;	496	u8 *d;
393	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
394		498
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
396		500
397	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
399		503
400	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
401	d = cdata;	505	d = cdata;
402	else	506	else
403	#endif	507	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
405		509
406	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
407	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	518	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	520	outl += outl2;
411		521
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	523	outl += outl2;
414		524
415	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	525	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
416		526
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
442	}	552	}
443	};	553	};
444		554
445	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
446	{	556	{
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;	557	u8 prot_major, prot_minor, randsize;
451	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
452	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
453
454	const u8 curflags () const
455	{
456	return 0x80
457	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}
459		560
460	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
461	bool chk_config () const;	562	bool chk_config () const;
		563
		564	static u8 get_features ()
		565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f |= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f |= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
		576	return f;
		577	}
462	};	578	};
463		579
		580	void
464	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
465	{	582	{
466	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	586	flags = 0;
470	flags = curflags ();	587	features = get_features ();
471	challengelen = sizeof (rsachallenge);
472		588
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		591	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
476		592
477	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	594	set_hdr (type, dst);
479	}	595	}
480		596
		597	bool
481	bool config_packet::chk_config () const	598	config_packet::chk_config () const
482	{	599	{
483	if (prot_major != PROTOCOL_MAJOR)	600	if (prot_major != PROTOCOL_MAJOR)
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	601	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	602	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	603	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)))	604	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));	605	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)))	606	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));	607	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		608	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		609	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
499	else	610	else
500	return true;	611	return true;
501		612
502	return false;	613	return false;
503	}	614	}
504		615
505	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
506	{	617	{
507	char magic[8];	618	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	621	u8 pad2, pad3;
511	rsaid id;	622	auth_encr encr;
512	rsaencrdata encr;
513		623
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	625	{
516	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
518	initiate = !!initiate_;	628	initiate = !!initiate_;
519	protocols = protocols_;	629	protocols = protocols_;
520		630
521	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
522	}	632	}
523	};	633	};
524		634
525	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
526	{	636	{
527	rsaid id;
528	u8 pad1, pad2, pad3;
529	u8 response_len; // encrypted length
530	rsaresponse response;	637	auth_response response;
531		638
532	auth_res_packet (int dst)	639	auth_res_packet (int dst)
533	{	640	{
534	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
535		642
…		…
569	};	676	};
570		677
571	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
572		679
573	void	680	void
574	connection::connection_established ()	681	connection::connection_established (const sockinfo &rsi)
575	{	682	{
		683	if (!have_snd_auth || !have_rcv_auth)
		684	return;
		685
		686	si = rsi;
		687	protocol = rsi.prot;
		688
		689	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		690	conf->nodename, (const char *)rsi,
		691	is_direct ? "direct" : "forwarded",
		692	PROTOCOL_MAJOR, prot_minor);
		693
		694	if (::conf.script_node_up)
		695	{
		696	run_script_cb *cb = new run_script_cb;
		697	cb->set<connection, &connection::script_node_up> (this);
		698	run_script_queued (cb, _("node-up command execution failed, continuing."));
		699	}
		700
		701	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		702	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		703
		704	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		705	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		706
576	if (ictx && octx)	707	if (ictx && octx)
577	{	708	{
578	connectmode = conf->connectmode;	709	// make sure rekeying timeouts are slightly asymmetric
		710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		711	rekey.start (rekey_interval, rekey_interval);
579		712
580	rekey.start (NOW + ::conf.rekey);
581	keepalive.start (NOW + ::conf.keepalive);	713	keepalive.start (::conf.keepalive);
582		714
583	// send queued packets	715	// send queued packets
584	if (ictx && octx)	716	if (ictx && octx)
585	{	717	{
586	while (tap_packet *p = (tap_packet *)data_queue.get ())	718	while (tap_packet *p = (tap_packet *)data_queue.get ())
587	{	719	{
588	send_data_packet (p);	720	if (p->len) send_data_packet (p);
589	delete p;	721	delete p;
590	}	722	}
591		723
592	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	724	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593	{	725	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	727	delete p;
596	}	728	}
597	}	729	}
		730
		731	vpn->connection_established (this);
598	}	732	}
		733	#if 0
599	else	734	else
600	{	735	{
601	retry_cnt = 0;	736	retry_cnt = 0;
602	establish_connection.start (NOW + 5);	737	establish_connection.start (5);
603	keepalive.stop ();	738	keepalive.stop ();
604	rekey.stop ();	739	rekey.stop ();
605	}	740	}
		741	#endif
606	}	742	}
607		743
608	void	744	void
609	connection::reset_si ()	745	connection::reset_si ()
610	{	746	{
		747	if (vpn->can_direct (THISNODE, conf))
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);	748	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
612		749	else
613	// mask out protocols we cannot establish	750	{
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	751	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	752	protocol = 0;
		753	}
616		754
617	si.set (conf, protocol);	755	si.set (conf, protocol);
		756
		757	is_direct = si.valid ();
618	}	758	}
619		759
620	// ensure sockinfo is valid, forward if necessary	760	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	761	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	762	connection::forward_si (const sockinfo &si) const
623	{	763	{
624	if (!si.valid ())	764	if (!si.valid ())
625	{	765	{
626	connection *r = vpn->find_router ();	766	connection *r = vpn->find_router_for (this);
627		767
628	if (r)	768	if (r)
629	{	769	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	770	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	771	conf->nodename, r->conf->nodename);
632	return r->si;	772	return r->si;
633	}	773	}
634	else	774	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	775	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	776	conf->nodename);
637	}	777	}
638		778
639	return si;	779	return si;
640	}	780	}
…		…
650	connection::send_ping (const sockinfo &si, u8 pong)	790	connection::send_ping (const sockinfo &si, u8 pong)
651	{	791	{
652	ping_packet *pkt = new ping_packet;	792	ping_packet *pkt = new ping_packet;
653		793
654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	794	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		795
		796	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	797	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		798
657	delete pkt;	799	delete pkt;
658	}	800	}
659		801
…		…
674	void	816	void
675	connection::send_auth_request (const sockinfo &si, bool initiate)	817	connection::send_auth_request (const sockinfo &si, bool initiate)
676	{	818	{
677	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	819	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
678		820
679	rsachallenge chg;	821	generate_auth_data ();
680	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	822	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
682		823
683	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	824	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	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
686		826
687	delete pkt;	827	delete pkt;
688	}	828	}
689		829
690	void	830	void
691	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	831	connection::send_auth_response (const sockinfo &si)
692	{	832	{
693	auth_res_packet *pkt = new auth_res_packet (conf->id);	833	auth_res_packet *pkt = new auth_res_packet (conf->id);
694		834
695	pkt->id = id;	835	auth_hash (rcv_auth, pkt->response.mac);
		836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
696		837
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);	838	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	839	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		840
705	delete pkt;	841	delete pkt;
706	}	842	}
707		843
708	void	844	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	845	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	846	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	847	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	848	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		849	conf->protocols);
713		850
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	851	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		852
716	r->hmac_set (octx);	853	r->hmac_set (octx);
717	send_vpn_packet (r, si);	854	send_vpn_packet (r, si);
718		855
719	delete r;	856	delete r;
720	}	857	}
721		858
722	void	859	inline void
723	connection::establish_connection_cb (time_watcher &w)	860	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	861	{
725	if (!ictx	862	if (!(ictx && octx)
726	&& conf != THISNODE	863	&& conf != THISNODE
727	&& connectmode != conf_node::C_NEVER	864	&& connectmode != conf_node::C_NEVER
728	&& connectmode != conf_node::C_DISABLED	865	&& connectmode != conf_node::C_DISABLED
729	&& NOW > w.at)	866	&& !w.is_active ())
730	{	867	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	868	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		869	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	870	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		871	{
		872	reset_connection ();
734	retry_cnt++;	873	return;
		874	}
735		875
736	w.start (NOW + retry_int);	876	last_establish_attempt = ev_now ();
		877
		878	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		879	? (retry_cnt & 3) + 1
		880	: 1 << (retry_cnt >> 2));
737		881
738	reset_si ();	882	reset_si ();
739		883
740	if (si.prot && !si.host)	884	bool slow = si.prot & PROT_SLOW;
		885
		886	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		887	{
		888	/*TODO*/ /* start the timer so we don't recurse endlessly */
		889	w.start (1);
741	vpn->send_connect_request (conf->id);	890	vpn->send_connect_request (this);
		891	}
742	else	892	else
743	{	893	{
		894	if (si.valid ())
		895	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		896	conf->nodename, (const char *)si);
		897
744	const sockinfo &dsi = forward_si (si);	898	const sockinfo &dsi = forward_si (si);
		899
		900	slow = slow || (dsi.prot & PROT_SLOW);
745		901
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	902	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	903	{
748	if (retry_cnt < 4)	904	if (retry_cnt < 4)
749	send_auth_request (dsi, true);	905	send_auth_request (dsi, true);
750	else	906	else
751	send_ping (dsi, 0);	907	send_ping (dsi, 0);
752	}	908	}
753	}	909	}
		910
		911	retry_int *= slow ? 8. : 0.9;
		912
		913	if (retry_int < conf->max_retry)
		914	retry_cnt++;
		915	else
		916	retry_int = conf->max_retry;
		917
		918	w.start (retry_int);
754	}	919	}
755	}	920	}
756		921
757	void	922	void
758	connection::reset_connection ()	923	connection::reset_connection ()
…		…
761	{	926	{
762	slog (L_INFO, _("%s(%s): connection lost"),	927	slog (L_INFO, _("%s(%s): connection lost"),
763	conf->nodename, (const char *)si);	928	conf->nodename, (const char *)si);
764		929
765	if (::conf.script_node_down)	930	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	931	{
		932	run_script_cb *cb = new run_script_cb;
		933	cb->set<connection, &connection::script_node_down> (this);
		934	run_script_queued (cb, _("node-down command execution failed, continuing."));
		935	}
767	}	936	}
768		937
769	delete ictx; ictx = 0;	938	delete ictx; ictx = 0;
770	delete octx; octx = 0;	939	delete octx; octx = 0;
771		940
772	si.host= 0;	941	si.host = 0;
773		942
		943	have_snd_auth = false;
		944	have_rcv_auth = false;
		945	auth_expire = 0.;
		946
774	last_activity = 0;	947	last_activity = 0.;
		948	//last_si_change = 0.;
775	retry_cnt = 0;	949	retry_cnt = 0;
776		950
777	rekey.stop ();	951	rekey.stop ();
778	keepalive.stop ();	952	keepalive.stop ();
779	establish_connection.stop ();	953	establish_connection.stop ();
…		…
786	send_reset (si);	960	send_reset (si);
787		961
788	reset_connection ();	962	reset_connection ();
789	}	963	}
790		964
791	void	965	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	966	inline void
		967	connection::rekey_cb (ev::timer &w, int revents)
793	{	968	{
794	reset_connection ();	969	reset_connection ();
795	establish_connection ();	970	establish_connection ();
796	}	971	}
797		972
…		…
813	if (oseqno > MAX_SEQNO)	988	if (oseqno > MAX_SEQNO)
814	rekey ();	989	rekey ();
815	}	990	}
816		991
817	void	992	void
		993	connection::post_inject_queue ()
		994	{
		995	// force a connection every now and when when packets are sent (max 1/s)
		996	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		997	establish_connection.stop ();
		998
		999	establish_connection ();
		1000	}
		1001
		1002	void
818	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1003	connection::inject_data_packet (tap_packet *pkt)
819	{	1004	{
820	if (ictx && octx)	1005	if (ictx && octx)
821	send_data_packet (pkt);	1006	send_data_packet (pkt);
822	else	1007	else
823	{	1008	{
824	if (!broadcast)//DDDD
825	data_queue.put (new tap_packet (*pkt));	1009	data_queue.put (new tap_packet (*pkt));
826		1010	post_inject_queue ();
827	establish_connection ();
828	}	1011	}
829	}	1012	}
830		1013
		1014	void
831	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1015	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832	{	1016	{
833	if (ictx && octx)	1017	if (ictx && octx)
834	send_vpn_packet (pkt, si, tos);	1018	send_vpn_packet (pkt, si, tos);
835	else	1019	else
836	{	1020	{
837	vpn_queue.put (new vpn_packet (*pkt));	1021	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
838		1022	post_inject_queue ();
839	establish_connection ();
840	}	1023	}
841	}	1024	}
842		1025
843	void	1026	void
844	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1027	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845	{	1028	{
846	last_activity = NOW;	1029	last_activity = ev_now ();
847		1030
848	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1031	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
849	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1032	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1033
		1034	if (connectmode == conf_node::C_DISABLED)
		1035	return;
850		1036
851	switch (pkt->typ ())	1037	switch (pkt->typ ())
852	{	1038	{
853	case vpn_packet::PT_PING:	1039	case vpn_packet::PT_PING:
		1040	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1041
854	// we send pings instead of auth packets after some retries,	1042	// we send pings instead of auth packets after some retries,
855	// so reset the retry counter and establish a connection	1043	// so reset the retry counter and establish a connection
856	// when we receive a ping.	1044	// when we receive a ping.
857	if (!ictx)	1045	if (!ictx)
858	{	1046	{
859	if (auth_rate_limiter.can (rsi))	1047	if (auth_rate_limiter.can (rsi))
860	send_auth_request (rsi, true);	1048	send_auth_request (rsi, true);
861	}	1049	}
862	else	1050	else
		1051	// we would love to change the socket address here, but ping's aren't
		1052	// authenticated, so we best ignore it.
863	send_ping (rsi, 1); // pong	1053	send_ping (rsi, 1); // pong
864		1054
865	break;	1055	break;
866		1056
867	case vpn_packet::PT_PONG:	1057	case vpn_packet::PT_PONG:
		1058	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1059
		1060	// a PONG might mean that the other side doesn't really know
		1061	// about our desire for communication.
		1062	establish_connection ();
868	break;	1063	break;
869		1064
870	case vpn_packet::PT_RESET:	1065	case vpn_packet::PT_RESET:
871	{	1066	{
872	reset_connection ();	1067	reset_connection ();
873		1068
874	config_packet *p = (config_packet *) pkt;	1069	config_packet *p = (config_packet *) pkt;
875		1070
876	if (!p->chk_config ())	1071	if (!p->chk_config ())
877	{	1072	{
878	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1073	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
879	conf->nodename, (const char *)rsi);	1074	conf->nodename, (const char *)rsi);
880	connectmode = conf_node::C_DISABLED;	1075	connectmode = conf_node::C_DISABLED;
881	}	1076	}
882	else if (connectmode == conf_node::C_ALWAYS)	1077	else if (connectmode == conf_node::C_ALWAYS)
883	establish_connection ();	1078	establish_connection ();
…		…
885	break;	1080	break;
886		1081
887	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
888	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
889	{	1084	{
890	auth_req_packet *p = (auth_req_packet *) pkt;	1085	auth_req_packet *p = (auth_req_packet *)pkt;
891		1086
892	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
893		1090
894	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
895	{	1092	{
896	if (p->prot_minor != PROTOCOL_MINOR)	1093	if (p->prot_minor != PROTOCOL_MINOR)
897	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1094	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
898	conf->nodename, (const char *)rsi,	1095	conf->nodename, (const char *)rsi,
899	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1096	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
900		1097
901	if (p->initiate)	1098	if (p->initiate)
902	send_auth_request (rsi, false);	1099	send_auth_request (rsi, false);
903		1100
904	rsachallenge k;	1101	auth_data auth;
905		1102
906	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1103	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
907	{	1104	{
908	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1105	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));	1106	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
910	break;
911	}	1107	}
912	else	1108	else
913	{	1109	{
914	delete octx;	1110	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
915		1111
916	octx = new crypto_ctx (k, 1);	1112	rcv_auth = auth;
917	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1113	have_rcv_auth = true;
918		1114
		1115	send_auth_response (rsi);
		1116
		1117	if (chg)
		1118	{
919	conf->protocols = p->protocols;	1119	conf->protocols = p->protocols;
		1120	features = p->features & config_packet::get_features ();
920		1121
921	send_auth_response (rsi, p->id, k);
922
923	connection_established ();	1122	connection_established (rsi);
924
925	break;	1123	}
926	}	1124	}
		1125
		1126	break;
927	}	1127	}
928	else	1128	else
929	slog (L_WARN, _("%s(%s): protocol mismatch"),	1129	slog (L_WARN, _("%s(%s): protocol mismatch."),
930	conf->nodename, (const char *)rsi);	1130	conf->nodename, (const char *)rsi);
931		1131
932	send_reset (rsi);	1132	send_reset (rsi);
933	}	1133	}
934		1134
935	break;	1135	break;
936		1136
937	case vpn_packet::PT_AUTH_RES:	1137	case vpn_packet::PT_AUTH_RES:
938	{	1138	{
939	auth_res_packet *p = (auth_res_packet *) pkt;	1139	auth_res_packet *p = (auth_res_packet *)pkt;
940		1140
941	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1141	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942		1142
943	if (p->chk_config ())	1143	if (p->chk_config ())
944	{	1144	{
945	if (p->prot_minor != PROTOCOL_MINOR)	1145	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	{	1146	{
954	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
955	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
956	break;
957	}	1149	}
958	else	1150	else if (!have_snd_auth)
959	{	1151	{
960	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1152	if (p->prot_minor != PROTOCOL_MINOR)
961		1153	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 an synchronization error"),
966	conf->nodename, (const char *)rsi);	1154	conf->nodename, (const char *)rsi,
967	break;	1155	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
968	}
969	else
970	{
971	rsaresponse h;
972		1156
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;	1157	prot_minor = p->prot_minor;
		1158	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
978		1159
979	delete ictx; ictx = cctx;	1160	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 ();	1161	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	}	1162	}
		1163
		1164	break;
1004	}	1165	}
1005	}	1166	}
1006		1167
1007	send_reset (rsi);	1168	send_reset (rsi);
1008	break;	1169	break;
…		…
1019	{	1180	{
1020	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1021		1182
1022	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
1023	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1024	"could be an attack, or just corruption or an synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1025	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
1026	else	1187	else
1027	{	1188	{
1028	u32 seqno;	1189	u32 seqno;
1029	tap_packet *d = p->unpack (this, seqno);	1190	tap_packet *d = p->unpack (this, seqno);
		1191	int seqclass = iseqno.seqno_classify (seqno);
1030		1192
1031	if (iseqno.recv_ok (seqno))	1193	if (seqclass == 0) // ok
1032	{	1194	{
1033	vpn->tap->send (d);	1195	vpn->tap->send (d);
1034		1196
1035	if (si != rsi)	1197	if (si != rsi)
1036	{	1198	{
1037	// fast re-sync on connection changes, useful especially for tcp/ip	1199	// fast re-sync on source address changes, useful especially for tcp/ip
		1200	//if (last_si_change < ev_now () + 5.)
1038	si = rsi;	1201	// {
1039
1040	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1202	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041	conf->nodename, (const char *)si, (const char *)rsi);	1203	conf->nodename, (const char *)si, (const char *)rsi);
		1204
		1205	si = rsi;
		1206
		1207	if (::conf.script_node_change)
		1208	{
		1209	run_script_cb *cb = new run_script_cb;
		1210	cb->set<connection, &connection::script_node_change> (this);
		1211	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1212	}
		1213
		1214	// }
		1215	//else
		1216	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1217	// conf->nodename, (const char *)si, (const char *)rsi);
1042	}	1218	}
1043
1044	delete d;
1045
1046	break;
1047	}	1219	}
		1220	else if (seqclass == 1) // far history
		1221	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1222	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1223	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1224	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1225	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1226	else if (seqclass == 3) // reset
		1227	{
		1228	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1229	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1230	send_reset (rsi);
		1231	}
		1232
		1233	delete d;
		1234	break;
1048	}	1235	}
1049	}	1236	}
1050		1237
1051	send_reset (rsi);	1238	send_reset (rsi);
1052	break;	1239	break;
1053		1240
1054	case vpn_packet::PT_CONNECT_REQ:	1241	case vpn_packet::PT_CONNECT_REQ:
1055	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1242	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056	{	1243	{
1057	connect_req_packet *p = (connect_req_packet *) pkt;	1244	connect_req_packet *p = (connect_req_packet *)pkt;
1058		1245
1059	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1246	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	{	1247	{
		1248	connection *c = vpn->conns[p->id - 1];
		1249	conf->protocols = p->protocols;
		1250
		1251	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1252	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1253	p->protocols,
		1254	c->ictx && c->octx);
		1255
		1256	if (c->ictx && c->octx)
		1257	{
1068	// send connect_info packets to both sides, in case one is	1258	// send connect_info packets to both sides, in case one is
1069	// behind a nat firewall (or both ;)	1259	// behind a nat firewall (or both ;)
1070	c->send_connect_info (conf->id, si, conf->protocols);	1260	c->send_connect_info (conf->id, si, conf->protocols);
1071	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1261	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1262	}
		1263	else
		1264	c->establish_connection ();
1072	}	1265	}
1073	else	1266	else
1074	c->establish_connection ();	1267	slog (L_WARN,
		1268	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1269	p->id);
1075	}	1270	}
1076		1271
1077	break;	1272	break;
1078		1273
1079	case vpn_packet::PT_CONNECT_INFO:	1274	case vpn_packet::PT_CONNECT_INFO:
1080	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1275	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081	{	1276	{
1082	connect_info_packet *p = (connect_info_packet *) pkt;	1277	connect_info_packet *p = (connect_info_packet *)pkt;
1083		1278
1084	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1279	if (p->id > 0 && p->id <= vpn->conns.size ())
1085		1280	{
1086	connection *c = vpn->conns[p->id - 1];	1281	connection *c = vpn->conns[p->id - 1];
1087		1282
1088	c->conf->protocols = p->protocols;	1283	c->conf->protocols = p->protocols;
1089	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1284	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1090	p->si.upgrade_protocol (protocol, c->conf);	1285	p->si.upgrade_protocol (protocol, c->conf);
1091		1286
1092	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1287	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);	1288	conf->nodename,
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si,
		1291	p->protocols,
		1292	protocol,
		1293	p->si.supported_protocols (c->conf),
		1294	!c->ictx && !c->octx);
1094		1295
1095	const sockinfo &dsi = forward_si (p->si);	1296	const sockinfo &dsi = forward_si (p->si);
1096		1297
1097	if (dsi.valid ())	1298	if (dsi.valid ())
1098	c->send_auth_request (dsi, true);	1299	c->send_auth_request (dsi, true);
		1300	else
		1301	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si);
		1304	}
		1305	else
		1306	slog (L_WARN,
		1307	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1308	p->id);
1099	}	1309	}
1100		1310
1101	break;	1311	break;
1102		1312
1103	default:	1313	default:
1104	send_reset (rsi);	1314	send_reset (rsi);
1105	break;	1315	break;
1106	}	1316	}
1107	}	1317	}
1108		1318
1109	void connection::keepalive_cb (time_watcher &w)	1319	inline void
		1320	connection::keepalive_cb (ev::timer &w, int revents)
1110	{	1321	{
1111	if (NOW >= last_activity + ::conf.keepalive + 30)	1322	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1323
		1324	if (when >= 0)
		1325	w.start (when);
		1326	else if (when < -15)
1112	{	1327	{
1113	reset_connection ();	1328	reset_connection ();
1114	establish_connection ();	1329	establish_connection ();
1115	}	1330	}
1116	else if (NOW < last_activity + ::conf.keepalive)
1117	w.start (last_activity + ::conf.keepalive);
1118	else if (conf->connectmode != conf_node::C_ONDEMAND	1331	else if (conf->connectmode != conf_node::C_ONDEMAND
1119	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1332	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1120	{	1333	{
		1334	w.start (3);
1121	send_ping (si);	1335	send_ping (si);
1122	w.start (NOW + 5);
1123	}	1336	}
1124	else if (NOW < last_activity + ::conf.keepalive + 10)	1337	else if (when >= -10)
1125	// hold ondemand connections implicitly a few seconds longer	1338	// hold ondemand connections implicitly a few seconds longer
1126	// should delete octx, though, or something like that ;)	1339	// should delete octx, though, or something like that ;)
1127	w.start (last_activity + ::conf.keepalive + 10);	1340	w.start (when + 10);
1128	else	1341	else
1129	reset_connection ();	1342	reset_connection ();
1130	}	1343	}
1131		1344
		1345	void
1132	void connection::send_connect_request (int id)	1346	connection::send_connect_request (int id)
1133	{	1347	{
1134	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1348	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1135		1349
1136	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1350	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1351	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1352	THISNODE->protocols);
1137	p->hmac_set (octx);	1353	p->hmac_set (octx);
1138	send_vpn_packet (p, si);	1354	send_vpn_packet (p, si);
1139		1355
1140	delete p;	1356	delete p;
1141	}	1357	}
1142		1358
1143	void connection::script_node ()	1359	void
		1360	connection::script_init_env (const char *ext)
1144	{	1361	{
1145	vpn->script_if_up ();
1146
1147	char *env;	1362	char *env;
		1363	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1364	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1365	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1366	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1367	conf->id & 0xff); putenv (env);
		1368	}
		1369
		1370	void
		1371	connection::script_init_connect_env ()
		1372	{
		1373	vpn->script_init_env ();
		1374
		1375	char *env;
1148	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1376	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1377	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1149	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1378	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1379	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1380	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152	}	1381	}
1153		1382
		1383	inline const char *
1154	const char *connection::script_node_up ()	1384	connection::script_node_up ()
1155	{	1385	{
1156	script_node ();	1386	script_init_connect_env ();
1157		1387
1158	putenv ("STATE=up");	1388	putenv ((char *)"STATE=up");
1159		1389
		1390	char *filename;
		1391	asprintf (&filename,
		1392	"%s/%s",
		1393	confbase,
1160	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1394	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161	}
1162		1395
		1396	return filename;
		1397	}
		1398
		1399	inline const char *
		1400	connection::script_node_change ()
		1401	{
		1402	script_init_connect_env ();
		1403
		1404	putenv ((char *)"STATE=change");
		1405
		1406	char *filename;
		1407	asprintf (&filename,
		1408	"%s/%s",
		1409	confbase,
		1410	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1411
		1412	return filename;
		1413	}
		1414
		1415	inline const char *
1163	const char *connection::script_node_down ()	1416	connection::script_node_down ()
1164	{	1417	{
1165	script_node ();	1418	script_init_connect_env ();
1166		1419
1167	putenv ("STATE=down");	1420	putenv ((char *)"STATE=down");
1168		1421
1169	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1422	char *filename;
1170	}	1423	asprintf (&filename,
		1424	"%s/%s",
		1425	confbase,
		1426	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171		1427
		1428	return filename;
		1429	}
		1430
1172	connection::connection(struct vpn *vpn_)	1431	connection::connection (struct vpn *vpn, conf_node *conf)
1173	: vpn(vpn_)	1432	: vpn(vpn), conf(conf),
1174	, rekey (this, &connection::rekey_cb)	1433	#if ENABLE_DNS
1175	, keepalive (this, &connection::keepalive_cb)	1434	dns (0),
		1435	#endif
		1436	data_queue(conf->max_ttl, conf->max_queue + 1),
		1437	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1438	{
		1439	rekey .set<connection, &connection::rekey_cb > (this);
		1440	keepalive .set<connection, &connection::keepalive_cb > (this);
1176	, establish_connection (this, &connection::establish_connection_cb)	1441	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177	{	1442
		1443	last_establish_attempt = 0.;
1178	octx = ictx = 0;	1444	octx = ictx = 0;
1179	retry_cnt = 0;
1180		1445
1181	connectmode = conf_node::C_ALWAYS; // initial setting	1446	connectmode = conf->connectmode;
		1447
		1448	// queue a dummy packet to force an initial connection attempt
		1449	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1450	vpn_queue.put (new net_packet);
		1451
1182	reset_connection ();	1452	reset_connection ();
1183	}	1453	}
1184		1454
1185	connection::~connection ()	1455	connection::~connection ()
1186	{	1456	{
1187	shutdown ();	1457	shutdown ();
1188	}	1458	}
1189		1459
		1460	void
1190	void connection_init ()	1461	connection_init ()
1191	{	1462	{
1192	auth_rate_limiter.clear ();	1463	auth_rate_limiter.clear ();
1193	reset_rate_limiter.clear ();	1464	reset_rate_limiter.clear ();
1194	}	1465	}
1195		1466

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