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Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.104 by root, Fri Jul 19 18:18:27 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	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
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	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
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	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
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include "gettext.h"	38	#include <openssl/rand.h>
		39	#include <openssl/evp.h>
		40	#include <openssl/rsa.h>
		41	#include <openssl/err.h>
28		42
29	#include "conf.h"	43	#include "conf.h"
30	#include "slog.h"	44	#include "slog.h"
31	#include "device.h"	45	#include "device.h"
32	#include "protocol.h"	46	#include "vpn.h"
33	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
34		49
35	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
36	# define RAND_pseudo_bytes RAND_bytes
37	#endif
38		51
39	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		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	//////////////////////////////////////////////////////////////////////////////
40		104
41	struct crypto_ctx	105	struct crypto_ctx
42	{	106	{
43	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
44	HMAC_CTX hctx;	108	HMAC_CTX hctx;
45		109
46	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);
47	~crypto_ctx ();	111	~crypto_ctx ();
48	};	112	};
49		113
50	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)
51	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
52	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
53	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
54	HMAC_CTX_init (&hctx);	146	}
55	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
56	}	147	}
57		148
58	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
59	{	150	{
60	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
61	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
62	}	153	}
63		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
64	static void	182	static void
65	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
66	{	184	{
67	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
68		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
69	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
70	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
71	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
72	EVP_DigestUpdate(&ctx, &id, sizeof id);
73	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
74	EVP_MD_CTX_cleanup (&ctx);
75	}	189	}
76		190
77	struct rsa_entry {	191	void
78	tstamp expire;	192	connection::generate_auth_data ()
79	rsaid id;
80	rsachallenge chg;
81	};
82
83	struct rsa_cache : list<rsa_entry>
84	{	193	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	194	if (auth_expire < ev_now ())
86
87	bool find (const rsaid &id, rsachallenge &chg)
88	{
89	for (iterator i = begin (); i != end (); ++i)
90	{
91	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
92	{
93	memcpy (&chg, &i->chg, sizeof chg);
94
95	erase (i);
96	return true;
97	}
98	}
99
100	if (cleaner.at < NOW)
101	cleaner.start (NOW + RSA_TTL);
102
103	return false;
104	}
105
106	void gen (rsaid &id, rsachallenge &chg)
107	{
108	rsa_entry e;
109
110	RAND_bytes ((unsigned char *)&id, sizeof id);
111	RAND_bytes ((unsigned char *)&chg, sizeof chg);
112
113	e.expire = NOW + RSA_TTL;
114	e.id = id;
115	memcpy (&e.chg, &chg, sizeof chg);
116
117	push_back (e);
118
119	if (cleaner.at < NOW)
120	cleaner.start (NOW + RSA_TTL);
121	}
122
123	rsa_cache ()
124	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
126		199
127	} rsa_cache;	200	// eventual response data
128		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
129	void rsa_cache::cleaner_cb (tstamp &ts)
130	{
131	if (empty ())
132	ts = TSTAMP_CANCEL;
133	else
134	{	202	}
135	ts = NOW + RSA_TTL;
136		203
137	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
138	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
139	i = erase (i);
140	else
141	++i;
142	}
143	}	206	}
144		207
145	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
146		209
147	void pkt_queue::put (tap_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
148	{	212	{
149	if (queue[i])	213	queue = new pkt [max_queue];
150	{
151	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;
153	}
154		214
155	queue[i] = p;
156
157	i = (i + 1) % QUEUEDEPTH;
158	}
159
160	tap_packet *pkt_queue::get ()
161	{
162	tap_packet *p = queue[j];
163
164	if (p)
165	{
166	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;
168	}
169
170	return p;
171	}
172
173	pkt_queue::pkt_queue ()
174	{
175	memset (queue, 0, sizeof (queue));
176	i = 0;	215	i = 0;
177	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
178	}	219	}
179		220
180	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
181	{	222	{
182	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
183	delete queue[i];	226	delete [] queue;
184	}	227	}
185		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
186	struct net_rateinfo {	285	struct net_rateinfo
		286	{
187	u32 host;	287	u32 host;
188	double pcnt, diff;	288	double pcnt, diff;
189	tstamp last;	289	tstamp last;
190	};	290	};
191		291
192	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
193	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	294	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
196	{	296	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
199	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
200		301
201	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	303	bool can (u32 host);
203	};	304	};
204		305
205	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206		307
		308	bool
207	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
208	{	310	{
209	iterator i;	311	iterator i;
210		312
211	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
212	if (i->host == host)	314	if (i->host == host)
213	break;	315	break;
214	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
215	i = erase (i);	317	i = erase (i);
216	else	318	else
217	i++;	319	i++;
218		320
219	if (i == end ())	321	if (i == end ())
220	{	322	{
221	net_rateinfo ri;	323	net_rateinfo ri;
222		324
223	ri.host = host;	325	ri.host = host;
224	ri.pcnt = 1.;	326	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	327	ri.diff = NRL_MAXDIF;
226	ri.last = NOW;	328	ri.last = ev_now ();
227		329
228	push_front (ri);	330	push_front (ri);
229		331
230	return true;	332	return true;
231	}	333	}
232	else	334	else
233	{	335	{
234	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
235	erase (i);	337	erase (i);
236		338
237	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
239		341
240	ri.last = NOW;	342	ri.last = ev_now ();
241		343
		344	double dif = ri.diff / ri.pcnt;
		345
242	bool send = ri.diff / ri.pcnt > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
243		347
		348	if (dif > NRL_MAXDIF)
		349	{
		350	ri.pcnt = 1.;
		351	ri.diff = NRL_MAXDIF;
		352	}
244	if (send)	353	else if (send)
245	ri.pcnt++;	354	ri.pcnt++;
246		355
247	push_front (ri);	356	push_front (ri);
248		357
249	return send;	358	return send;
250	}	359	}
251	}	360	}
252		361
253	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
254		363
255	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
256
257	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
258	{	366	{
259	unsigned int xlen;
260
261	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
262		368
263	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
264	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
265	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
266	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
267	}	372	}
268		373
269	void	374	void
270	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
271	{	376	{
272	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
273		378	hmac_gen (ctx, hmac_digest);
274	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
275	}	380	}
276		381
277	bool	382	bool
278	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
279	{	384	{
280	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
281		386	hmac_gen (ctx, hmac_digest);
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	388	}
284		389
		390	void
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	392	{
287	this->type = type;	393	type = type_;
288		394
289	int src = THISNODE->id;	395	int src = THISNODE->id;
290		396
291	src1 = src;	397	src1 = src;
292	srcdst = ((src >> 8) << 4) | (dst >> 8);	398	srcdst = ((src >> 8) << 4) | (dst >> 8);
…		…
294	}	400	}
295		401
296	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
297	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
298		404
299	struct vpndata_packet:vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		410	tap_packet *unpack (connection *conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
300	{	414	{
301	u8 data[MAXVPNDATA + DATAHDR]; // seqno
302
303	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
304	tap_packet *unpack (connection *conn, u32 &seqno);
305	private:
306
307	const u32 data_hdr_size () const
308	{
309	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
310	}
311	};	416	}
		417	};
312		418
313	void	419	void
314	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
315	{	421	{
316	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
317	int outl = 0, outl2;	423	int outl = 0, outl2;
318	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
319		425
320	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
321	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
322	u32 cl;
323		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
324	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
325	if (cl)	433	if (cl)
326	{	434	{
327	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
328	d = cdata;	436	d = cdata;
329	l = cl + 2;	437	l = cl + 2;
330		438
331	d[0] = cl >> 8;	439	d[0] = cl >> 8;
332	d[1] = cl;	440	d[1] = cl;
		441	}
333	}	442	}
334	#endif	443	#endif
335		444
336	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
337		446
338	struct {	447	struct {
339	#if RAND_SIZE	448	#if RAND_SIZE
340	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
341	#endif	450	#endif
342	u32 seqno;	451	u32 seqno;
343	} datahdr;	452	} datahdr;
344		453
345	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
346	#if RAND_SIZE	455	#if RAND_SIZE
347	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
348	#endif	459	#endif
349		460
350	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
351	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
352	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
353	outl += outl2;	464	outl += outl2;
354		465
355	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) d, l);	468	(unsigned char *) d, l));
358	outl += outl2;	469	outl += outl2;
359		470
360	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
361	outl += outl2;	472	outl += outl2;
362		473
363	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
364		475
365	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
374	int outl = 0, outl2;	485	int outl = 0, outl2;
375	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
376	u8 *d;	487	u8 *d;
377	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
378		489
379	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
380		491
381	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
382	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
383		494
384	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
385	d = cdata;	496	d = cdata;
386	else	497	else
387	#endif	498	#endif
388	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
389		500
390	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
391	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
392	d, &outl2,	509	d, &outl2,
393	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
394	outl += outl2;	511	outl += outl2;
395		512
396	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
397	outl += outl2;	514	outl += outl2;
398		515
399	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	516	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
400		517
401	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
426	}	543	}
427	};	544	};
428		545
429	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
430	{	547	{
431	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
432	// field comes before this data, so peers with other
433	// hmacs simply will not work.
434	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
435	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
436	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
437		552
438	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
439	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f |= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f |= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
440	return 0x80	568	return f;
441	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
442	}	569	}
443
444	void setup (ptype type, int dst);
445	bool chk_config () const;
446	};	570	};
447		571
		572	void
448	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
449	{	574	{
450	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
451	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
452	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
453	hmaclen = HMACLENGTH;	578	flags = 0;
454	flags = curflags ();	579	features = get_features ();
455	challengelen = sizeof (rsachallenge);
456		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
457	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
458	digest_nid = htonl (EVP_MD_type (RSA_HASH));
459	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
460		586
461	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
462	set_hdr (type, dst);	588	set_hdr (type, dst);
463	}	589	}
464		590
465	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
466	{	593	{
467	return prot_major == PROTOCOL_MAJOR	594	if (prot_major != PROTOCOL_MAJOR)
468	&& randsize == RAND_SIZE	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
469	&& hmaclen == HMACLENGTH	596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
470	&& flags == curflags ()	597	else if (randsize != RAND_SIZE)
471	&& challengelen == sizeof (rsachallenge)	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
472	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
473	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
474	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
475	}	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
476		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
		617	return true;
		618	}
		619
		620	return false;
		621	}
		622
477	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
478	{	624	{
479	char magic[8];	625	char magic[8];
480	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
481	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
482	u8 pad2, pad3;	628	u8 pad2, pad3;
483	rsaid id;	629	auth_encr encr;
484	rsaencrdata encr;
485		630
486	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
487	{	632	{
488	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
489	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
490	initiate = !!initiate_;	635	initiate = !!initiate_;
491	protocols = protocols_;	636	protocols = protocols_;
492		637
493	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
494	}	639	}
495	};	640	};
496		641
497	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
498	{	643	{
499	rsaid id;
500	u8 pad1, pad2, pad3;
501	u8 response_len; // encrypted length
502	rsaresponse response;	644	auth_response response;
503		645
504	auth_res_packet (int dst)	646	auth_res_packet (int dst)
505	{	647	{
506	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
507		649
508	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
509	}	651	}
510	};	652	};
511		653
…		…
541	};	683	};
542		684
543	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
544		686
545	void	687	void
		688	connection::connection_established (const sockinfo &rsi)
		689	{
		690	if (!have_snd_auth || !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
		723	if (ictx && octx)
		724	{
		725	while (tap_packet *p = (tap_packet *)data_queue.get ())
		726	{
		727	if (p->len) send_data_packet (p);
		728	delete p;
		729	}
		730
		731	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
		736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
546	connection::reset_dstaddr ()	742	connection::reset_si ()
547	{	743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		746	else
		747	{
		748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		749	protocol = 0;
		750	}
		751
548	si.set (conf);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
		755	}
		756
		757	// ensure sockinfo is valid, forward if necessary
		758	const sockinfo &
		759	connection::forward_si (const sockinfo &si) const
		760	{
		761	if (!si.valid ())
		762	{
		763	connection *r = vpn->find_router_for (this);
		764
		765	if (r)
		766	{
		767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		768	conf->nodename, r->conf->nodename);
		769	return r->si;
		770	}
		771	else
		772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		773	conf->nodename);
		774	}
		775
		776	return si;
		777	}
		778
		779	void
		780	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		781	{
		782	if (!vpn->send_vpn_packet (pkt, si, tos))
		783	reset_connection ();
549	}	784	}
550		785
551	void	786	void
552	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
553	{	788	{
554	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
555		790
556	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
557	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
558		795
559	delete pkt;	796	delete pkt;
560	}	797	}
561		798
…		…
576	void	813	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	815	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580		817
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);	818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
582		820
583	rsachallenge chg;
584
585	rsa_cache.gen (pkt->id, chg);
586
587	if (0 > RSA_public_encrypt (sizeof chg,
588	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");
591
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
593		823
		824	delete pkt;
		825	}
		826
		827	void
		828	connection::send_auth_response (const sockinfo &si)
		829	{
		830	auth_res_packet *pkt = new auth_res_packet (conf->id);
		831
		832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
		834
		835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
595		837
596	delete pkt;	838	delete pkt;
597	}	839	}
598		840
599	void	841	void
600	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
601	{
602	auth_res_packet *pkt = new auth_res_packet (conf->id);
603
604	pkt->id = id;
605
606	rsa_hash (id, chg, pkt->response);
607
608	pkt->hmac_set (octx);
609
610	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
611
612	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
613
614	delete pkt;
615	}
616
617	void
618	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
619	{	843	{
620	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
621	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
622		847
623	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
624		849
625	r->hmac_set (octx);	850	r->hmac_set (octx);
626	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
627		852
628	delete r;	853	delete r;
629	}	854	}
630		855
631	void	856	inline void
632	connection::establish_connection_cb (tstamp &ts)	857	connection::establish_connection_cb (ev::timer &w, int revents)
633	{	858	{
634	if (ictx || conf == THISNODE	859	if (!(ictx && octx)
		860	&& conf != THISNODE
635	|| connectmode == conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
636	|| connectmode == conf_node::C_DISABLED)	862	&& connectmode != conf_node::C_DISABLED
637	ts = TSTAMP_CANCEL;	863	&& !w.is_active ())
638	else if (ts <= NOW)
639	{	864	{
640	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
641		866	// and stop trying. should probably be handled by a per-connection expire handler.
642	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
643	retry_cnt++;
644
645	ts = NOW + retry_int;
646
647	if (conf->hostname)
648	{	868	{
649	reset_dstaddr ();	869	reset_connection ();
650	if (si.host && auth_rate_limiter.can (si))	870	return;
651	{
652	if (retry_cnt < 4)
653	send_auth_request (si, true);
654	else
655	send_ping (si, 0);
656	}	871	}
		872
		873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
		878
		879	reset_si ();
		880
		881	bool slow = si.prot & PROT_SLOW;
		882
		883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/*TODO*/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
		887	vpn->send_connect_request (this);
657	}	888	}
658	else	889	else
659	vpn->connect_request (conf->id);	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
		895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow || (dsi.prot & PROT_SLOW);
		898
		899	if (dsi.valid () && auth_rate_limiter.can (dsi))
		900	{
		901	if (retry_cnt < 4)
		902	send_auth_request (dsi, true);
		903	else
		904	send_ping (dsi, 0);
		905	}
		906	}
		907
		908	retry_int *= slow ? 8. : 0.9;
		909
		910	if (retry_int < conf->max_retry)
		911	retry_cnt++;
		912	else
		913	retry_int = conf->max_retry;
		914
		915	w.start (retry_int);
660	}	916	}
661	}	917	}
662		918
663	void	919	void
664	connection::reset_connection ()	920	connection::reset_connection ()
…		…
667	{	923	{
668	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
669	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
670		926
671	if (::conf.script_node_down)	927	if (::conf.script_node_down)
672	run_script (run_script_cb (this, &connection::script_node_down), false);	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
		931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
673	}	933	}
674		934
675	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
676	delete octx; octx = 0;	936	delete octx; octx = 0;
677		937
678	si.host= 0;	938	si.host = 0;
679		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
680	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
681	retry_cnt = 0;	946	retry_cnt = 0;
682		947
683	rekey.reset ();	948	rekey.stop ();
684	keepalive.reset ();	949	keepalive.stop ();
685	establish_connection.reset ();	950	establish_connection.stop ();
686	}	951	}
687		952
688	void	953	void
689	connection::shutdown ()	954	connection::shutdown ()
690	{	955	{
…		…
692	send_reset (si);	957	send_reset (si);
693		958
694	reset_connection ();	959	reset_connection ();
695	}	960	}
696		961
697	void	962	// poor-man's rekeying
698	connection::rekey_cb (tstamp &ts)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
699	{	965	{
700	ts = TSTAMP_CANCEL;
701
702	reset_connection ();	966	reset_connection ();
703	establish_connection ();	967	establish_connection ();
704	}	968	}
705		969
706	void	970	void
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
708	{	972	{
709	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	974	int tos = 0;
711		975
712	if (conf->inherit_tos	976	// I am not hilarious about peeking into packets, but so be it.
713	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	977	if (conf->inherit_tos && pkt->is_ipv4 ())
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		979
717	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	980	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
718	send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
719		982
720	delete p;	983	delete p;
721		984
722	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
723	rekey ();	986	rekey ();
724	}	987	}
725		988
726	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
727	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
728	{	1001	{
729	if (ictx && octx)	1002	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
731	else	1004	else
732	{	1005	{
733	if (!broadcast)//DDDD
734	queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
		1007	post_inject_queue ();
		1008	}
		1009	}
735		1010
736	establish_connection ();	1011	void
		1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1013	{
		1014	if (ictx && octx)
		1015	send_vpn_packet (pkt, si, tos);
		1016	else
		1017	{
		1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1019	post_inject_queue ();
737	}	1020	}
738	}	1021	}
739		1022
740	void	1023	void
741	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
742	{	1025	{
743	last_activity = NOW;	1026	last_activity = ev_now ();
744		1027
745	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
747		1033
748	switch (pkt->typ ())	1034	switch (pkt->typ ())
749	{	1035	{
750	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
751	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
753	// when we receive a ping.	1041	// when we receive a ping.
754	if (!ictx)	1042	if (!ictx)
		1043	{
		1044	if (auth_rate_limiter.can (rsi))
		1045	send_auth_request (rsi, true);
		1046	}
		1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
		1050	send_ping (rsi, 1); // pong
		1051
		1052	break;
		1053
		1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
		1060	break;
		1061
		1062	case vpn_packet::PT_RESET:
755	{	1063	{
756	if (auth_rate_limiter.can (rsi))	1064	reset_connection ();
757	send_auth_request (rsi, true);	1065
		1066	config_packet *p = (config_packet *) pkt;
		1067
		1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
		1069	establish_connection ();
758	}	1070	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	1071	break;
763		1072
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	1073	case vpn_packet::PT_AUTH_REQ:
768	{	1074	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet *p = (config_packet *) pkt;
772
773	if (!p->chk_config ())
774	{	1075	{
		1076	auth_req_packet *p = (auth_req_packet *)pkt;
		1077
		1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
		1081
		1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
775	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
776	conf->nodename, (const char *)rsi);	1085	conf->nodename, (const char *)rsi);
777	connectmode = conf_node::C_DISABLED;	1086	}
		1087	else if (p->chk_config (conf, rsi))
		1088	{
		1089	if (p->prot_minor != PROTOCOL_MINOR)
		1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1091	conf->nodename, (const char *)rsi,
		1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1093
		1094	if (p->initiate)
		1095	send_auth_request (rsi, false);
		1096
		1097	auth_data auth;
		1098
		1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1100	{
		1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
		1104	else
		1105	{
		1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
		1107
		1108	rcv_auth = auth;
		1109	have_rcv_auth = true;
		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
		1115	conf->protocols = p->protocols;
		1116	features = p->features & config_packet::get_features ();
		1117
		1118	connection_established (rsi);
		1119	}
		1120	}
		1121
		1122	break;
		1123	}
		1124
		1125	send_reset (rsi);
778	}	1126	}
779	else if (connectmode == conf_node::C_ALWAYS)	1127
780	establish_connection ();
781	}
782	break;	1128	break;
783		1129
784	case vpn_packet::PT_AUTH_REQ:	1130	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	1131	{
787	auth_req_packet *p = (auth_req_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
788		1133
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
790		1135
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
792	{	1140	{
793	if (p->prot_minor != PROTOCOL_MINOR)	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
794	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
795	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;
802
803	if (0 > RSA_private_decrypt (sizeof (p->encr),
804	(unsigned char *)&p->encr, (unsigned char *)&k,
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
808	else
809	{
810	retry_cnt = 0;
811	establish_connection.set (NOW + 8); //? ;)
812	keepalive.reset ();
813	rekey.reset ();
814
815	delete ictx;
816	ictx = 0;
817
818	delete octx;
819
820	octx = new crypto_ctx (k, 1);
821	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
822
823	conf->protocols = p->protocols;
824	send_auth_response (rsi, p->id, k);
825
826	break;
827	}
828	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
829		1147
830	send_reset (rsi);	1148	have_snd_auth = true;
		1149	connection_established (rsi);
		1150	}
		1151
		1152	break;
831	}	1153	}
832		1154
		1155	send_reset (rsi);
833	break;	1156	break;
834		1157
835	case vpn_packet::PT_AUTH_RES:	1158	case vpn_packet::PT_DATA_COMPRESSED:
836	{	1159	#if !ENABLE_COMPRESSION
837	auth_res_packet *p = (auth_res_packet *) pkt;	1160	send_reset (rsi);
		1161	break;
		1162	#endif
838		1163
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1164	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1165
841	if (p->chk_config ())	1166	if (ictx && octx)
842	{	1167	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1168	vpndata_packet *p = (vpndata_packet *)pkt;
844	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
845	conf->nodename, (const char *)rsi,
846	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
847		1169
848	rsachallenge chg;	1170	if (!p->hmac_chk (ictx))
849		1171	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1172	"could be an attack, or just corruption or a synchronization error."),
851	slog (L_ERR, _("%s(%s): unrequested auth response"),
852	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
853	else	1174	else
854	{	1175	{
855	crypto_ctx *cctx = new crypto_ctx (chg, 0);
856
857	if (!p->hmac_chk (cctx))
858	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
859	"could be an attack, or just corruption or an synchronization error"),
860	conf->nodename, (const char *)rsi);
861	else	1176	u32 seqno;
		1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
		1179
		1180	if (seqclass == 0) // ok
862	{	1181	{
863	rsaresponse h;	1182	vpn->tap->send (d);
864		1183
865	rsa_hash (p->id, chg, h);	1184	if (si != rsi)
866
867	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
868	{	1185	{
869	prot_minor = p->prot_minor;	1186	// fast re-sync on source address changes, useful especially for tcp/ip
870		1187	//if (last_si_change < ev_now () + 5.)
871	delete ictx; ictx = cctx;
872
873	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875	si = rsi;
876
877	rekey.set (NOW + ::conf.rekey);
878	keepalive.set (NOW + ::conf.keepalive);
879
880	// send queued packets
881	while (tap_packet *p = queue.get ())
882	{	1188	// {
883	send_data_packet (p);	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1190	conf->nodename, (const char *)si, (const char *)rsi);
		1191
		1192	si = rsi;
		1193
		1194	if (::conf.script_node_change)
884	delete p;	1195	{
		1196	run_script_cb *cb = new run_script_cb;
		1197	cb->set<connection, &connection::script_node_change> (this);
		1198	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1199	}
		1200
885	}	1201	// }
886		1202	//else
887	connectmode = conf->connectmode;	1203	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
888
889	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
890	conf->nodename, (const char *)rsi,	1204	// conf->nodename, (const char *)si, (const char *)rsi);
891	strprotocol (protocol),
892	p->prot_major, p->prot_minor);
893
894	if (::conf.script_node_up)
895	run_script (run_script_cb (this, &connection::script_node_up), false);
896
897	break;
898	}	1205	}
899	else
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
901	conf->nodename, (const char *)rsi);
902	}	1206	}
		1207	else if (seqclass == 1) // far history
		1208	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1209	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1210	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1211	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 3) // reset
		1214	{
		1215	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1216	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1217	send_reset (rsi);
		1218	}
903		1219
904	delete cctx;	1220	delete d;
		1221	break;
905	}	1222	}
906	}	1223	}
907	}
908		1224
909	send_reset (rsi);	1225	send_reset (rsi);
910	break;	1226	break;
911		1227
912	case vpn_packet::PT_DATA_COMPRESSED:
913	#if !ENABLE_COMPRESSION
914	send_reset (rsi);
915	break;
916	#endif
917
918	case vpn_packet::PT_DATA_UNCOMPRESSED:
919
920	if (ictx && octx)
921	{
922	vpndata_packet *p = (vpndata_packet *)pkt;
923
924	if (rsi == si)
925	{
926	if (!p->hmac_chk (ictx))
927	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
928	"could be an attack, or just corruption or an synchronization error"),
929	conf->nodename, (const char *)rsi);
930	else
931	{
932	u32 seqno;
933	tap_packet *d = p->unpack (this, seqno);
934
935	if (iseqno.recv_ok (seqno))
936	{
937	vpn->tap->send (d);
938
939	if (p->dst () == 0) // re-broadcast
940	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
941	{
942	connection *c = *i;
943
944	if (c->conf != THISNODE && c->conf != conf)
945	c->inject_data_packet (d);
946	}
947
948	delete d;
949
950	break;
951	}
952	}
953	}
954	else
955	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
956	}
957
958	send_reset (rsi);
959	break;
960
961	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1230	{
964	connect_req_packet *p = (connect_req_packet *) pkt;	1231	connect_req_packet *p = (connect_req_packet *)pkt;
965		1232
966	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1233	if (p->id > 0 && p->id <= vpn->conns.size ())
967	conf->protocols = p->protocols;	1234	{
968	connection *c = vpn->conns[p->id - 1];	1235	connection *c = vpn->conns[p->id - 1];
		1236	conf->protocols = p->protocols;
969		1237
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1238	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1239	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1240	p->protocols,
971	conf->id, p->id, c->ictx && c->octx);	1241	c->ictx && c->octx);
972		1242
973	if (c->ictx && c->octx)	1243	if (c->ictx && c->octx)
974	{	1244	{
975	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1247	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1248	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1249	}
		1250	else
		1251	c->establish_connection ();
979	}	1252	}
		1253	else
		1254	slog (L_WARN,
		1255	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1256	p->id);
980	}	1257	}
981		1258
982	break;	1259	break;
983		1260
984	case vpn_packet::PT_CONNECT_INFO:	1261	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1262	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1263	{
987	connect_info_packet *p = (connect_info_packet *) pkt;	1264	connect_info_packet *p = (connect_info_packet *)pkt;
988		1265
989	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1266	if (p->id > 0 && p->id <= vpn->conns.size ())
990	conf->protocols = p->protocols;	1267	{
991	connection *c = vpn->conns[p->id - 1];	1268	connection *c = vpn->conns[p->id - 1];
992		1269
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1270	c->conf->protocols = p->protocols;
994	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1271	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1272	p->si.upgrade_protocol (protocol, c->conf);
995		1273
		1274	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		1275	conf->nodename,
		1276	vpn->conns[p->id - 1]->conf->nodename,
		1277	(const char *)p->si,
		1278	p->protocols,
		1279	protocol,
		1280	p->si.supported_protocols (c->conf),
		1281	!c->ictx && !c->octx);
		1282
		1283	const sockinfo &dsi = forward_si (p->si);
		1284
		1285	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1286	c->send_auth_request (dsi, true);
		1287	else
		1288	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si);
		1291	}
		1292	else
		1293	slog (L_WARN,
		1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1295	p->id);
997	}	1296	}
998		1297
999	break;	1298	break;
1000		1299
1001	default:	1300	default:
1002	send_reset (rsi);	1301	send_reset (rsi);
1003	break;	1302	break;
1004
1005	}	1303	}
1006	}	1304	}
1007		1305
1008	void connection::keepalive_cb (tstamp &ts)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1009	{	1308	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1309	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1310
		1311	if (when >= 0)
		1312	w.start (when);
		1313	else if (when < -15)
1011	{	1314	{
1012	reset_connection ();	1315	reset_connection ();
1013	establish_connection ();	1316	establish_connection ();
1014	}	1317	}
1015	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1320	{
		1321	w.start (3);
1020	send_ping (si);	1322	send_ping (si);
1021	ts = NOW + 5;
1022	}	1323	}
		1324	else if (when >= -10)
		1325	// hold ondemand connections implicitly a few seconds longer
		1326	// should delete octx, though, or something like that ;)
		1327	w.start (when + 10);
1023	else	1328	else
1024	reset_connection ();	1329	reset_connection ();
1025	}	1330	}
1026		1331
		1332	void
1027	void connection::connect_request (int id)	1333	connection::send_connect_request (int id)
1028	{	1334	{
1029	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1030		1336
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1339	THISNODE->protocols);
1032	p->hmac_set (octx);	1340	p->hmac_set (octx);
1033	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1034		1342
1035	delete p;	1343	delete p;
1036	}	1344	}
1037		1345
1038	void connection::script_node ()	1346	void
		1347	connection::script_init_env (const char *ext)
1039	{	1348	{
1040	vpn->script_if_up (0);
1041
1042	char *env;	1349	char *env;
		1350	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1351	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1352	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1353	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1354	conf->id & 0xff); putenv (env);
		1355	}
		1356
		1357	void
		1358	connection::script_init_connect_env ()
		1359	{
		1360	vpn->script_init_env ();
		1361
		1362	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1363	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1364	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1368	}
1048		1369
		1370	inline const char *
1049	const char *connection::script_node_up (int)	1371	connection::script_node_up ()
1050	{	1372	{
1051	script_node ();	1373	script_init_connect_env ();
1052		1374
1053	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1054		1376
		1377	char *filename;
		1378	asprintf (&filename,
		1379	"%s/%s",
		1380	confbase,
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1056	}
1057		1382
		1383	return filename;
		1384	}
		1385
		1386	inline const char *
		1387	connection::script_node_change ()
		1388	{
		1389	script_init_connect_env ();
		1390
		1391	putenv ((char *)"STATE=change");
		1392
		1393	char *filename;
		1394	asprintf (&filename,
		1395	"%s/%s",
		1396	confbase,
		1397	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1398
		1399	return filename;
		1400	}
		1401
		1402	inline const char *
1058	const char *connection::script_node_down (int)	1403	connection::script_node_down ()
1059	{	1404	{
1060	script_node ();	1405	script_init_connect_env ();
1061		1406
1062	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1063		1408
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1409	char *filename;
1065	}	1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1066		1414
1067	// send a vpn packet out to other hosts	1415	return filename;
1068	void
1069	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1070	{
1071	if (protocol & PROT_IPv4)
1072	vpn->send_ipv4_packet (pkt, si, tos);
1073	else
1074	vpn->send_udpv4_packet (pkt, si, tos);
1075	}	1416	}
1076		1417
1077	connection::connection(struct vpn *vpn_)	1418	connection::connection (struct vpn *vpn, conf_node *conf)
1078	: vpn(vpn_)	1419	: vpn(vpn), conf(conf),
1079	, rekey (this, &connection::rekey_cb)	1420	#if ENABLE_DNS
1080	, keepalive (this, &connection::keepalive_cb)	1421	dns (0),
		1422	#endif
		1423	data_queue(conf->max_ttl, conf->max_queue + 1),
		1424	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1425	{
		1426	rekey .set<connection, &connection::rekey_cb > (this);
		1427	keepalive .set<connection, &connection::keepalive_cb > (this);
1081	, establish_connection (this, &connection::establish_connection_cb)	1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1082	{	1429
		1430	last_establish_attempt = 0.;
1083	octx = ictx = 0;	1431	octx = ictx = 0;
1084	retry_cnt = 0;
1085		1432
1086	connectmode = conf_node::C_ALWAYS; // initial setting	1433	connectmode = conf->connectmode;
		1434
		1435	// queue a dummy packet to force an initial connection attempt
		1436	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1437	vpn_queue.put (new net_packet);
		1438
1087	reset_connection ();	1439	reset_connection ();
1088	}	1440	}
1089		1441
1090	connection::~connection ()	1442	connection::~connection ()
1091	{	1443	{
1092	shutdown ();	1444	shutdown ();
1093	}	1445	}
1094		1446
		1447	void
1095	void connection_init ()	1448	connection_init ()
1096	{	1449	{
1097	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1098	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1099	}	1452	}
1100		1453

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