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Comparing gvpe/src/connection.C (file contents):
Revision 1.60 by pcg, Sat Nov 10 05:14:22 2007 UTC vs.
Revision 1.112 by root, Fri Sep 12 10:40:43 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) require (exp)
		49	#endif
30		50
31	#include "conf.h"	51	#include "conf.h"
32	#include "slog.h"	52	#include "slog.h"
33	#include "device.h"	53	#include "device.h"
34	#include "vpn.h"	54	#include "vpn.h"
35	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
36		57
37	#include "netcompat.h"	58	#include "netcompat.h"
38		59
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		61
45	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
46	#define HLOG 15	63	#define HLOG 15
47	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
50		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb *cb, const char *warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
51	struct crypto_ctx	112	struct crypto_ctx
52	{	113	{
53	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	115	HMAC_CTX hctx;
55		116
56	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	118	~crypto_ctx ();
58	};	119	};
59		120
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
62	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	153	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	154	}
67		155
68	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
69	{	157	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
72	}	160	}
73		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
74	static void	189	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	191	{
77	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	196	}
86		197
87	struct rsa_entry {	198	void
88	tstamp expire;	199	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	200	{
95	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;	201	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	202	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev::ev_now ())	203	// request data
102	{	204	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		206
105	erase (i);	207	// eventual response data
106	return true;	208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	209	}
109		210
110	if (!cleaner.is_active ())	211	// every use prolongs the expiry
111	cleaner.again ();
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 = ev::ev_now () + RSA_TTL;	212	auth_expire = ev_now () + AUTH_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (!cleaner.is_active ())
130	cleaner.again ();
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{
136	cleaner.set (RSA_TTL, RSA_TTL);
137	}
138
139	} rsa_cache;
140
141	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
142	{
143	if (empty ())
144	w.stop ();
145	else
146	{
147	for (iterator i = begin (); i != end (); )
148	if (i->expire <= ev::ev_now ())
149	i = erase (i);
150	else
151	++i;
152	}
153	}	213	}
154		214
155	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
156		216
157	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
158	{	219	{
159	if (queue[i])	220	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		221
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	222	i = 0;
187	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	226	}
189		227
190	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
191	{	229	{
192	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
193	delete queue[i];	233	delete [] queue;
194	}	234	}
195		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
196	struct net_rateinfo {	292	struct net_rateinfo
		293	{
197	u32 host;	294	u32 host;
198	double pcnt, diff;	295	double pcnt, diff;
199	tstamp last;	296	tstamp last;
200	};	297	};
201		298
…		…
211		308
212	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	310	bool can (u32 host);
214	};	311	};
215		312
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		314
		315	bool
218	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
219	{	317	{
220	iterator i;	318	iterator i;
221		319
222	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
223	if (i->host == host)	321	if (i->host == host)
224	break;	322	break;
225	else if (i->last < ev::ev_now () - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	324	i = erase (i);
227	else	325	else
228	i++;	326	i++;
229		327
230	if (i == end ())	328	if (i == end ())
…		…
232	net_rateinfo ri;	330	net_rateinfo ri;
233		331
234	ri.host = host;	332	ri.host = host;
235	ri.pcnt = 1.;	333	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
237	ri.last = ev::ev_now ();	335	ri.last = ev_now ();
238		336
239	push_front (ri);	337	push_front (ri);
240		338
241	return true;	339	return true;
242	}	340	}
…		…
244	{	342	{
245	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
246	erase (i);	344	erase (i);
247		345
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (ev::ev_now () - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		348
251	ri.last = ev::ev_now ();	349	ri.last = ev_now ();
252		350
253	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
254		352
255	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
256		354
…		…
268	}	366	}
269	}	367	}
270		368
271	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
272		370
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	373	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
280		375
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	379	}
286		380
287	void	381	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	383	{
290	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		385	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	387	}
294		388
295	bool	389	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	391	{
298	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		393	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	395	}
302		396
		397	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	399	{
305	type = type_;	400	type = type_;
306		401
307	int src = THISNODE->id;	402	int src = THISNODE->id;
308		403
…		…
313		408
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		411
317	struct vpndata_packet : vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
318	{	421	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	423	}
		424	};
330		425
331	void	426	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	428	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
337		432
338	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
340		435
341	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
342	{	437	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		439
345	if (cl)	440	if (cl)
346	{	441	{
…		…
352	d[1] = cl;	447	d[1] = cl;
353	}	448	}
354	}	449	}
355	#endif	450	#endif
356		451
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		453
359	struct {	454	struct {
360	#if RAND_SIZE	455	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
362	#endif	457	#endif
363	u32 seqno;	458	u32 seqno;
364	} datahdr;	459	} datahdr;
365		460
366	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	462	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	// NB: a constant (per session) random prefix
		464	// is likely enough, but we don't take any chances.
		465	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	466	#endif
370		467
371	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	492	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
397	u8 *d;	494	u8 *d;
398	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
399		496
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		498
402	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
404		501
405	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	503	d = cdata;
407	else	504	else
408	#endif	505	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
410		507
411	/* this overwrites part of the src mac, but we fix that later */	508	// we play do evil games with the struct layout atm.
		509	// pending better solutions, we at least do some verification.
		510	// this is fine, as we left ISO territory long ago.
		511	require (DATAHDR <= 16);
		512	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		513
		514	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	516	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	518	outl += outl2;
416		519
…		…
447	}	550	}
448	};	551	};
449		552
450	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
451	{	554	{
452	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
458		559
459	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
460	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		562
462	static u8 get_features ()	563	static u8 get_features ()
463	{	564	{
464	u8 f = 0;	565	u8 f = 0;
465	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
…		…
473	#endif	574	#endif
474	return f;	575	return f;
475	}	576	}
476	};	577	};
477		578
		579	void
478	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
479	{	581	{
480	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;
484	flags = 0;	585	flags = 0;
485	challengelen = sizeof (rsachallenge);
486	features = get_features ();	586	features = get_features ();
487		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
488	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
489	digest_nid = htonl (EVP_MD_type (RSA_HASH));
490	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
491		593
492	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
493	set_hdr (type, dst);	595	set_hdr (type, dst);
494	}	596	}
495		597
496	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
497	{	600	{
498	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
499	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
500	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
501	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
502	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
503	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
504	else if (challengelen != sizeof (rsachallenge))
505	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
506	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
507	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
508	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
510	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
511	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	611	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		613	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		614	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		615	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
512	else	616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		619
		620	if (cmp > 0)
		621	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		622	conf->nodename, (const char *)rsi);
		623	else if (cmp == 0)
513	return true;	624	return true;
		625	}
514		626
515	return false;	627	return false;
516	}	628	}
517		629
518	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
519	{	631	{
520	char magic[8];	632	char magic[8];
521	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
522	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
523	u8 pad2, pad3;	635	u8 pad2, pad3;
524	rsaid id;	636	auth_encr encr;
525	rsaencrdata encr;
526		637
527	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
528	{	639	{
529	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
530	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
531	initiate = !!initiate_;	642	initiate = !!initiate_;
532	protocols = protocols_;	643	protocols = protocols_;
533		644
534	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
535	}	646	}
536	};	647	};
537		648
538	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
539	{	650	{
540	rsaid id;
541	u8 pad1, pad2, pad3;
542	u8 response_len; // encrypted length
543	rsaresponse response;	651	auth_response response;
544		652
545	auth_res_packet (int dst)	653	auth_res_packet (int dst)
546	{	654	{
547	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
548		656
549	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
550	}	658	}
551	};	659	};
552		660
…		…
582	};	690	};
583		691
584	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
585		693
586	void	694	void
587	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
588	{	696	{
589	if (ictx && octx)	697	if (!have_snd_auth || !have_rcv_auth)
		698	return;
		699
		700	si = rsi;
		701	protocol = rsi.prot;
		702
		703	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		704	conf->nodename, (const char *)rsi,
		705	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		706	PROTOCOL_MAJOR, prot_minor);
		707
		708	if (::conf.script_node_up)
		709	{
		710	run_script_cb *cb = new run_script_cb;
		711	cb->set<connection, &connection::script_node_up> (this);
		712	run_script_queued (cb, _("node-up command execution failed, continuing."));
590	{	713	}
591	connectmode = conf->connectmode;	714
		715	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		716	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
592		717
		718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
593	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
594	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
595	rekey.start (rekey_interval, rekey_interval);	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
596	keepalive.start (::conf.keepalive);	729	keepalive.start (::conf.keepalive);
597		730
598	// send queued packets	731	// send queued packets
599	if (ictx && octx)
600	{
601	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
602	{	733	{
603	send_data_packet (p);	734	if (p->len) send_data_packet (p);
604	delete p;	735	delete p;
605	}	736	}
606		737
607	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
608	{	739	{
609	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
610	delete p;	741	delete p;
611	}
612	}
613	}	742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
		748	connection::reset_si ()
		749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
614	else	752	else
615	{	753	{
616	retry_cnt = 0;
617	establish_connection.start (5);
618	keepalive.stop ();
619	rekey.stop ();
620	}
621	}
622
623	void
624	connection::reset_si ()
625	{
626	protocol = best_protocol (THISNODE->protocols & conf->protocols);
627
628	// mask out protocols we cannot establish
629	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
630	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
631	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
632
633	if (protocol
634	&& (!conf->can_direct (THISNODE)
635	|| !THISNODE->can_direct (conf)))
636	{
637	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
638	protocol = 0;	755	protocol = 0;
639	}	756	}
640		757
641	si.set (conf, protocol);	758	si.set (conf, protocol);
642	}	759	}
…		…
645	const sockinfo &	762	const sockinfo &
646	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
647	{	764	{
648	if (!si.valid ())	765	if (!si.valid ())
649	{	766	{
650	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
651		768
652	if (r)	769	if (r)
653	{	770	{
654	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
655	conf->nodename, r->conf->nodename, (const char *)r->si);	772	conf->nodename, r->conf->nodename);
656	return r->si;	773	return r->si;
657	}	774	}
658	else	775	else
659	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
660	conf->nodename);	777	conf->nodename);
661	}	778	}
662		779
663	return si;	780	return si;
664	}	781	}
665		782
666	void	783	void
667	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
668	{	785	{
669	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
670	reset_connection ();	787	reset_connection ("packet send error");
671	}	788	}
672		789
673	void	790	void
674	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
675	{	792	{
676	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
677		794
678	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	795	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		796
		797	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
679	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
680		799
681	delete pkt;	800	delete pkt;
682	}	801	}
683		802
…		…
698	void	817	void
699	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
700	{	819	{
701	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	820	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
702		821
703	rsachallenge chg;	822	generate_auth_data ();
704	rsa_cache.gen (pkt->id, chg);
705	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
706		824
707	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	825	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
708
709	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
710		827
711	delete pkt;	828	delete pkt;
712	}	829	}
713		830
714	void	831	void
715	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
716	{	833	{
717	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
718		835
719	pkt->id = id;	836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		837	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
720		838
721	rsa_hash (id, chg, pkt->response);
722
723	pkt->hmac_set (octx);
724
725	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
726
727	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
728		841
729	delete pkt;	842	delete pkt;
730	}	843	}
731		844
732	void	845	void
733	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
734	{	847	{
735	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
736	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
737		851
738	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	852	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
739		853
740	r->hmac_set (octx);	854	r->hmac_set (octx);
741	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
742		856
743	delete r;	857	delete r;
744	}	858	}
745		859
746	void	860	inline void
747	connection::establish_connection_cb (ev::timer &w, int revents)	861	connection::establish_connection_cb (ev::timer &w, int revents)
748	{	862	{
749	if (!ictx	863	if (!(ictx && octx)
750	&& conf != THISNODE	864	&& conf != THISNODE
751	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
752	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
753	&& !w.is_active ())	867	&& !w.is_active ())
754	{	868	{
		869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		870	// and stop trying. should probably be handled by a per-connection expire handler.
		871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
		874	return;
		875	}
		876
		877	last_establish_attempt = ev_now ();
		878
755	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
756	? (retry_cnt & 3) + 1	880	? (retry_cnt & 3) + 1
757	: 1 << (retry_cnt >> 2));	881	: 1 << (retry_cnt >> 2));
758		882
759	reset_si ();	883	reset_si ();
760		884
761	bool slow = si.prot & PROT_SLOW;	885	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
762		886
763	if (si.prot && !si.host)	887	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
764	{	888	{
765	/*TODO*/ /* start the timer so we don't recurse endlessly */	889	/*TODO*/ /* start the timer so we don't recurse endlessly */
766	w.start (1);	890	w.start (1);
767	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
768	}	892	}
769	else	893	else
770	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
771	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
772		900
773	slow = slow || (dsi.prot & PROT_SLOW);	901	slow = slow || (dsi.prot & PROT_SLOW);
774		902
775	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
776	{	904	{
777	if (retry_cnt < 4)	905	// use ping after the first few retries
		906	// TODO: on rekeys, the other node might not interpret ping correctly,
		907	// TODO: as it will still have a valid connection
		908	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
778	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
779	else	910	else
780	send_ping (dsi, 0);	911	send_ping (dsi, 0);
781	}	912	}
782	}	913	}
783		914
784	retry_int *= slow ? 8. : 0.7;	915	retry_int *= slow ? 4. : 0.9;
785		916
786	if (retry_int < conf->max_retry)	917	if (retry_int < conf->max_retry)
787	retry_cnt++;	918	retry_cnt++;
788	else	919	else
789	retry_int = conf->max_retry;	920	retry_int = conf->max_retry;
…		…
791	w.start (retry_int);	922	w.start (retry_int);
792	}	923	}
793	}	924	}
794		925
795	void	926	void
796	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
797	{	928	{
798	if (ictx && octx)	929	if (ictx && octx)
799	{	930	{
800	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
801	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
802		933
803	if (::conf.script_node_down)	934	if (::conf.script_node_down)
804	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	935	{
		936	run_script_cb *cb = new run_script_cb;
		937	cb->set<connection, &connection::script_node_down> (this);
805	slog (L_WARN, _("node-down command execution failed, continuing."));	938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
806	}	940	}
807		941
808	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
809	delete octx; octx = 0;	943	delete octx; octx = 0;
810	#if ENABLE_DNS
811	dnsv4_reset_connection ();
812	#endif
813		944
814	si.host = 0;	945	si.host = 0;
815		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
816	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
817	retry_cnt = 0;	953	retry_cnt = 0;
818		954
819	rekey.stop ();	955	rekey.stop ();
820	keepalive.stop ();	956	keepalive.stop ();
821	establish_connection.stop ();	957	establish_connection.stop ();
…		…
825	connection::shutdown ()	961	connection::shutdown ()
826	{	962	{
827	if (ictx && octx)	963	if (ictx && octx)
828	send_reset (si);	964	send_reset (si);
829		965
830	reset_connection ();	966	reset_connection ("shutdown");
831	}	967	}
832		968
833	void	969	// poor-man's rekeying
		970	inline void
834	connection::rekey_cb (ev::timer &w, int revents)	971	connection::rekey_cb (ev::timer &w, int revents)
835	{	972	{
836	reset_connection ();	973	reset_connection ("rekeying");
837	establish_connection ();	974	establish_connection ();
838	}	975	}
839		976
840	void	977	void
841	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
855	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
856	rekey ();	993	rekey ();
857	}	994	}
858		995
859	void	996	void
		997	connection::post_inject_queue ()
		998	{
		999	// force a connection every now and when when packets are sent (max 1/s)
		1000	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1001	establish_connection.stop ();
		1002
		1003	establish_connection ();
		1004	}
		1005
		1006	void
860	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
861	{	1008	{
862	if (ictx && octx)	1009	if (ictx && octx)
863	send_data_packet (pkt);	1010	send_data_packet (pkt);
864	else	1011	else
865	{	1012	{
866	if (!broadcast)
867	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
868		1014	post_inject_queue ();
869	establish_connection ();
870	}	1015	}
871	}	1016	}
872		1017
		1018	void
873	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
874	{	1020	{
875	if (ictx && octx)	1021	if (ictx && octx)
876	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
877	else	1023	else
878	{	1024	{
879	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
880		1026	post_inject_queue ();
881	establish_connection ();
882	}	1027	}
883	}	1028	}
884		1029
885	void	1030	void
886	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
887	{	1032	{
888	last_activity = ev::ev_now ();	1033	last_activity = ev_now ();
889		1034
890	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1035	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
891	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1036	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1037
		1038	if (connectmode == conf_node::C_DISABLED)
		1039	return;
892		1040
893	switch (pkt->typ ())	1041	switch (pkt->typ ())
894	{	1042	{
895	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
896	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
897	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
898	// when we receive a ping.	1048	// when we receive a ping.
899	if (!ictx)	1049	if (!ictx)
900	{	1050	{
901	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
902	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
903	}	1053	}
904	else	1054	else
		1055	// we would love to change the socket address here, but ping's aren't
		1056	// authenticated, so we best ignore it.
905	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
906		1058
907	break;	1059	break;
908		1060
909	case vpn_packet::PT_PONG:	1061	case vpn_packet::PT_PONG:
		1062	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1063
		1064	// a PONG might mean that the other side doesn't really know
		1065	// about our desire for communication.
		1066	establish_connection ();
910	break;	1067	break;
911		1068
912	case vpn_packet::PT_RESET:	1069	case vpn_packet::PT_RESET:
		1070	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1071
		1072	if (ictx && octx)
913	{	1073	{
914	reset_connection ();	1074	reset_connection ("remote reset");
915		1075
916	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
917		1077
918	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
919	{
920	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
921	conf->nodename, (const char *)rsi);
922	connectmode = conf_node::C_DISABLED;
923	}
924	else if (connectmode == conf_node::C_ALWAYS)
925	establish_connection ();	1079	establish_connection ();
926	}	1080	}
		1081
927	break;	1082	break;
928		1083
929	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
930	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
931	{	1086	{
932	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
933		1088
934	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1089	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1090	conf->nodename, p->initiate ? "initiate" : "reply",
		1091	p->protocols, p->features);
935		1092
936	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1093	if (memcmp (p->magic, MAGIC, 8))
		1094	{
		1095	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1096	conf->nodename, (const char *)rsi);
		1097	}
		1098	else if (p->chk_config (conf, rsi))
937	{	1099	{
938	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
939	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1101	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
940	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
941	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
942		1104
943	if (p->initiate)	1105	if (p->initiate)
		1106	{
944	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
945		1108
946	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
947		1112
		1113	auth_data auth;
		1114
948	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
949	{	1116	{
950	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
951	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
952	break;
953	}	1119	}
954	else	1120	else
955	{	1121	{
956	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
957		1123
958	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
959	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
960		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
961	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
962	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
963		1133
964	send_auth_response (rsi, p->id, k);
965
966	connection_established ();	1134	connection_established (rsi);
967
968	break;	1135	}
969	}	1136	}
		1137
		1138	break;
970	}	1139	}
971	else
972	slog (L_WARN, _("%s(%s): protocol mismatch"),
973	conf->nodename, (const char *)rsi);
974		1140
975	send_reset (rsi);	1141	send_reset (rsi);
976	}	1142	}
977		1143
978	break;	1144	break;
979		1145
980	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
981	{	1147	{
982	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
983		1149
984	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
985		1151
986	if (p->chk_config ())	1152	auth_mac local_mac;
		1153	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1154
		1155	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
987	{	1156	{
988	if (p->prot_minor != PROTOCOL_MINOR)
989	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
990	conf->nodename, (const char *)rsi,
991	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
992
993	rsachallenge chg;
994
995	if (!rsa_cache.find (p->id, chg))
996	{
997	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
998	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
999	break;
1000	}	1159	}
1001	else	1160	else if (!have_snd_auth)
1002	{	1161	{
1003	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1004		1163
1005	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
1006	{
1007	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1008	"could be an attack, or just corruption or a synchronization error"),
1009	conf->nodename, (const char *)rsi);
1010	break;
1011	}
1012	else
1013	{
1014	rsaresponse h;
1015
1016	rsa_hash (p->id, chg, h);
1017
1018	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1019	{
1020	prot_minor = p->prot_minor;
1021
1022	delete ictx; ictx = cctx;
1023
1024	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1025
1026	si = rsi;
1027	protocol = rsi.prot;
1028
1029	connection_established ();	1165	connection_established (rsi);
1030
1031	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1032	conf->nodename, (const char *)rsi,
1033	p->prot_major, p->prot_minor);
1034
1035	if (::conf.script_node_up)
1036	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1037	slog (L_WARN, _("node-up command execution failed, continuing."));
1038
1039	break;
1040	}
1041	else
1042	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1043	conf->nodename, (const char *)rsi);
1044	}
1045
1046	delete cctx;
1047	}
1048	}	1166	}
1049	}	1167	}
1050
1051	send_reset (rsi);
1052	break;	1168	break;
1053		1169
1054	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1055	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1056	send_reset (rsi);	1172	send_reset (rsi);
…		…
1062	if (ictx && octx)	1178	if (ictx && octx)
1063	{	1179	{
1064	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1065		1181
1066	if (!p->hmac_chk (ictx))	1182	if (!p->hmac_chk (ictx))
		1183	{
		1184	// rekeying often creates temporary hmac auth floods
		1185	// we assume they don't take longer than a few seconds normally,
		1186	// and suppress messages and resets during that time.
		1187	//TODO: should be done per source address
		1188	if (!hmac_error)
		1189	{
		1190	hmac_error = ev_now () + 3;
		1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
		1195	else
		1196	{
1067	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1068	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1069	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1070	else	1203	else
1071	{	1204	{
1072	u32 seqno;	1205	u32 seqno;
1073	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1074		1208
1075	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1076	{	1212	{
1077	vpn->tap->send (d);	1213	vpn->tap->send (d);
1078		1214
1079	if (si != rsi)	1215	if (si != rsi)
1080	{	1216	{
1081	// fast re-sync on source address changes, useful especially for tcp/ip	1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
1082	si = rsi;	1219	// {
1083
1084	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1085	conf->nodename, (const char *)si, (const char *)rsi);	1221	conf->nodename, (const char *)si, (const char *)rsi);
		1222
		1223	si = rsi;
		1224
		1225	if (::conf.script_node_change)
		1226	{
		1227	run_script_cb *cb = new run_script_cb;
		1228	cb->set<connection, &connection::script_node_change> (this);
		1229	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1230	}
		1231
		1232	// }
		1233	//else
		1234	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1235	// conf->nodename, (const char *)si, (const char *)rsi);
1086	}	1236	}
		1237	}
		1238	else if (seqclass == 1) // far history
		1239	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1240	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1241	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1242	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1243	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1244	else if (seqclass == 3) // reset
		1245	{
		1246	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1247	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1248	send_reset (rsi);
1087	}	1249	}
1088		1250
1089	delete d;	1251	delete d;
1090	break;	1252	break;
1091	}	1253	}
…		…
1095	break;	1257	break;
1096		1258
1097	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1098	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1099	{	1261	{
1100	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1101		1263
1102	if (p->id > 0 && p->id <= vpn->conns.size ())	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1103	{	1265	{
1104	connection *c = vpn->conns[p->id - 1];	1266	connection *c = vpn->conns[p->id - 1];
1105	conf->protocols = p->protocols;	1267	conf->protocols = p->protocols;
1106		1268
1107	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1269	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1270	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1271	p->protocols,
1108	conf->id, p->id, c->ictx && c->octx);	1272	c->ictx && c->octx);
1109		1273
1110	if (c->ictx && c->octx)	1274	if (c->ictx && c->octx)
1111	{	1275	{
1112	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1113	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
…		…
1136		1300
1137	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1138	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1139	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1140		1304
1141	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1142	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1306	conf->nodename,
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si,
		1309	p->protocols,
		1310	protocol,
		1311	p->si.supported_protocols (c->conf),
		1312	!c->ictx && !c->octx);
1143		1313
1144	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1145		1315
1146	if (dsi.valid ())	1316	if (dsi.valid ())
1147	c->send_auth_request (dsi, true);	1317	c->send_auth_request (dsi, true);
		1318	else
		1319	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si);
1148	}	1322	}
1149	else	1323	else
1150	slog (L_WARN,	1324	slog (L_WARN,
1151	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1152	p->id);	1326	p->id);
…		…
1158	send_reset (rsi);	1332	send_reset (rsi);
1159	break;	1333	break;
1160	}	1334	}
1161	}	1335	}
1162		1336
		1337	inline void
1163	void connection::keepalive_cb (ev::timer &w, int revents)	1338	connection::keepalive_cb (ev::timer &w, int revents)
1164	{	1339	{
1165	if (ev::ev_now () >= last_activity + ::conf.keepalive + 30)	1340	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1341
		1342	if (when >= 0)
		1343	w.start (when);
		1344	else if (when < -15)
1166	{	1345	{
1167	reset_connection ();	1346	reset_connection ("keepalive overdue");
1168	establish_connection ();	1347	establish_connection ();
1169	}	1348	}
1170	else if (ev::ev_now () < last_activity + ::conf.keepalive)
1171	w.start (last_activity + ::conf.keepalive - ev::now ());
1172	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1173	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1174	{	1351	{
		1352	w.start (3);
1175	send_ping (si);	1353	send_ping (si);
1176	w.start (5);
1177	}	1354	}
1178	else if (ev::ev_now () < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1179	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1180	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1181	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1358	w.start (when + 10);
1182	else	1359	else
1183	reset_connection ();	1360	reset_connection ("keepalive timeout");
1184	}	1361	}
1185		1362
		1363	void
1186	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1187	{	1365	{
1188	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1366	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1189		1367
1190	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1368	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1369	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1370	THISNODE->protocols);
1191	p->hmac_set (octx);	1371	p->hmac_set (octx);
1192	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1193		1373
1194	delete p;	1374	delete p;
1195	}	1375	}
1196		1376
		1377	void
1197	void connection::script_init_env (const char *ext)	1378	connection::script_init_env (const char *ext)
1198	{	1379	{
1199	char *env;	1380	char *env;
1200	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1201	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1202	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1203	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1204	conf->id & 0xff); putenv (env);	1385	conf->id & 0xff); putenv (env);
1205	}	1386	}
1206		1387
		1388	void
1207	void connection::script_init_connect_env ()	1389	connection::script_init_connect_env ()
1208	{	1390	{
1209	vpn->script_init_env ();	1391	vpn->script_init_env ();
1210		1392
1211	char *env;	1393	char *env;
1212	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1394	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1395	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1213	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1214	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1215	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1216	}	1399	}
1217		1400
		1401	inline const char *
1218	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1219	{	1403	{
1220	script_init_connect_env ();	1404	script_init_connect_env ();
1221		1405
1222	putenv ((char *)"STATE=up");	1406	putenv ((char *)"STATE=up");
1223		1407
…		…
1228	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1229		1413
1230	return filename;	1414	return filename;
1231	}	1415	}
1232		1416
		1417	inline const char *
		1418	connection::script_node_change ()
		1419	{
		1420	script_init_connect_env ();
		1421
		1422	putenv ((char *)"STATE=change");
		1423
		1424	char *filename;
		1425	asprintf (&filename,
		1426	"%s/%s",
		1427	confbase,
		1428	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1429
		1430	return filename;
		1431	}
		1432
		1433	inline const char *
1233	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1234	{	1435	{
1235	script_init_connect_env ();	1436	script_init_connect_env ();
1236		1437
1237	putenv ((char *)"STATE=down");	1438	putenv ((char *)"STATE=down");
1238		1439
…		…
1244		1445
1245	return filename;	1446	return filename;
1246	}	1447	}
1247		1448
1248	connection::connection (struct vpn *vpn, conf_node *conf)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1249	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1250	, rekey (this, &connection::rekey_cb)
1251	, keepalive (this, &connection::keepalive_cb)
1252	, establish_connection (this, &connection::establish_connection_cb)
1253	#if ENABLE_DNS	1451	#if ENABLE_DNS
1254	, dns (0)	1452	dns (0),
1255	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1256	{	1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
		1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1460
		1461	last_establish_attempt = 0.;
1257	octx = ictx = 0;	1462	octx = ictx = 0;
1258	retry_cnt = 0;
1259		1463
1260	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1261	conf->protocols = PROT_UDPv4;
1262		1465
1263	connectmode = conf_node::C_ALWAYS; // initial setting	1466	// queue a dummy packet to force an initial connection attempt
		1467	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1468	vpn_queue.put (new net_packet);
		1469
1264	reset_connection ();	1470	reset_connection ("startup");
1265	}	1471	}
1266		1472
1267	connection::~connection ()	1473	connection::~connection ()
1268	{	1474	{
1269	shutdown ();	1475	shutdown ();
1270	}	1476	}
1271		1477
		1478	void
1272	void connection_init ()	1479	connection_init ()
1273	{	1480	{
1274	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1275	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1276	}	1483	}
1277		1484

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