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Comparing gvpe/src/connection.C (file contents):
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs.
Revision 1.105 by root, Fri Jul 19 18:22:54 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
30
31	#include "gettext.h"
32		42
33	#include "conf.h"	43	#include "conf.h"
34	#include "slog.h"	44	#include "slog.h"
35	#include "device.h"	45	#include "device.h"
36	#include "vpn.h"	46	#include "vpn.h"
37	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
38		49
39	#include "netcompat.h"	50	#include "netcompat.h"
40		51
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
46		54
47	#define ULTRA_FAST 1	55	#define ULTRA_FAST 1
48	#define HLOG 15	56	#define HLOG 15
49	#include "lzf/lzf.h"	57	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	58	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	59	#include "lzf/lzf_d.c"
52		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb *cb, const char *warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
		104
53	struct crypto_ctx	105	struct crypto_ctx
54	{	106	{
55	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	108	HMAC_CTX hctx;
57		109
58	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	111	~crypto_ctx ();
60	};	112	};
61		113
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
64	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	146	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	147	}
69		148
70	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
71	{	150	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
74	}	153	}
75		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
76	static void	182	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	184	{
79	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
80		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	189	}
88		190
89	struct rsa_entry {	191	void
90	tstamp expire;	192	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	193	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		199
139	} rsa_cache;	200	// eventual response data
140		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	202	}
145	w.start (NOW + RSA_TTL);
146		203
147	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
148	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	206	}
154		207
155	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
156		209
157	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
158	{	212	{
159	if (queue[i])	213	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		214
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	215	i = 0;
187	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	219	}
189		220
190	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
191	{	222	{
192	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
193	delete queue[i];	226	delete [] queue;
194	}	227	}
195		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
196	struct net_rateinfo {	285	struct net_rateinfo
		286	{
197	u32 host;	287	u32 host;
198	double pcnt, diff;	288	double pcnt, diff;
199	tstamp last;	289	tstamp last;
200	};	290	};
201		291
…		…
211		301
212	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	303	bool can (u32 host);
214	};	304	};
215		305
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		307
		308	bool
218	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
219	{	310	{
220	iterator i;	311	iterator i;
221		312
222	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
223	if (i->host == host)	314	if (i->host == host)
224	break;	315	break;
225	else if (i->last < NOW - NRL_EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	317	i = erase (i);
227	else	318	else
228	i++;	319	i++;
229		320
230	if (i == end ())	321	if (i == end ())
…		…
232	net_rateinfo ri;	323	net_rateinfo ri;
233		324
234	ri.host = host;	325	ri.host = host;
235	ri.pcnt = 1.;	326	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	327	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	328	ri.last = ev_now ();
238		329
239	push_front (ri);	330	push_front (ri);
240		331
241	return true;	332	return true;
242	}	333	}
…		…
244	{	335	{
245	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
246	erase (i);	337	erase (i);
247		338
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		341
251	ri.last = NOW;	342	ri.last = ev_now ();
252		343
253	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
254		345
255	bool send = dif > NRL_CUTOFF;	346	bool send = dif > NRL_CUTOFF;
256		347
…		…
268	}	359	}
269	}	360	}
270		361
271	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
272		363
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	366	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
280		368
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	372	}
286		373
287	void	374	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	376	{
290	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		378	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	380	}
294		381
295	bool	382	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	384	{
298	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		386	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	388	}
302		389
		390	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	392	{
305	type = type_;	393	type = type_;
306		394
307	int src = THISNODE->id;	395	int src = THISNODE->id;
308		396
…		…
313		401
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		404
317	struct vpndata_packet : vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		410	tap_packet *unpack (connection *conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
318	{	414	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	416	}
		417	};
330		418
331	void	419	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	421	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
337		425
338	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
340		428
341	if (conn->features & ENABLE_COMPRESSION)	429	if (conn->features & FEATURE_COMPRESSION)
342	{	430	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		432
345	if (cl)	433	if (cl)
346	{	434	{
…		…
352	d[1] = cl;	440	d[1] = cl;
353	}	441	}
354	}	442	}
355	#endif	443	#endif
356		444
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		446
359	struct {	447	struct {
360	#if RAND_SIZE	448	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
362	#endif	450	#endif
363	u32 seqno;	451	u32 seqno;
364	} datahdr;	452	} datahdr;
365		453
366	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	455	#if RAND_SIZE
368	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);
369	#endif	459	#endif
370		460
371	require (EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	463	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	485	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
397	u8 *d;	487	u8 *d;
398	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
399		489
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		491
402	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
404		494
405	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	496	d = cdata;
407	else	497	else
408	#endif	498	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
410		500
411	/* 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
412	require (EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	509	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	510	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	511	outl += outl2;
416		512
…		…
447	}	543	}
448	};	544	};
449		545
450	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
451	{	547	{
452	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
458		552
459	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
460	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		555
462	static u8 get_features ()	556	static u8 get_features ()
463	{	557	{
464	u8 f = 0;	558	u8 f = 0;
465	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	560	f |= FEATURE_COMPRESSION;
467	#endif	561	#endif
468	#if ENABLE_ROHC	562	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	563	f |= FEATURE_ROHC;
470	#endif	564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
471	return f;	568	return f;
472	}	569	}
473	};	570	};
474		571
		572	void
475	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
476	{	574	{
477	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	578	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	579	features = get_features ();
484		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	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 ()));
488		586
489	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	588	set_hdr (type, dst);
491	}	589	}
492		590
493	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	593	{
495	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
514	return true;	617	return true;
		618	}
515		619
516	return false;	620	return false;
517	}	621	}
518		622
519	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
520	{	624	{
521	char magic[8];	625	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	628	u8 pad2, pad3;
525	rsaid id;	629	auth_encr encr;
526	rsaencrdata encr;
527		630
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	632	{
530	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	635	initiate = !!initiate_;
533	protocols = protocols_;	636	protocols = protocols_;
534		637
535	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
536	}	639	}
537	};	640	};
538		641
539	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	643	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	644	auth_response response;
545		645
546	auth_res_packet (int dst)	646	auth_res_packet (int dst)
547	{	647	{
548	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
549		649
550	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
551	}	651	}
552	};	652	};
553		653
…		…
583	};	683	};
584		684
585	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
586		686
587	void	687	void
588	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
589	{	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
590	if (ictx && octx)	723	if (ictx && octx)
591	{	724	{
592	connectmode = conf->connectmode;	725	while (tap_packet *p = (tap_packet *)data_queue.get ())
593
594	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey
596	+ (conf->id > THISNODE->id ? 10 : 0));
597	keepalive.start (NOW + ::conf.keepalive);
598
599	// send queued packets
600	if (ictx && octx)
601	{	726	{
602	while (tap_packet *p = (tap_packet *)data_queue.get ())
603	{
604	send_data_packet (p);	727	if (p->len) send_data_packet (p);
605	delete p;	728	delete p;
606	}
607
608	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
609	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;
612	}
613	}	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	}
614	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
615	else	746	else
616	{	747	{
617	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
618	establish_connection.start (NOW + 5);	749	protocol = 0;
619	keepalive.stop ();
620	rekey.stop ();
621	}	750	}
622	}
623
624	void
625	connection::reset_si ()
626	{
627	protocol = best_protocol (THISNODE->protocols & conf->protocols);
628
629	// mask out protocols we cannot establish
630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
632	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
633		751
634	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
635	}	755	}
636		756
637	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
638	const sockinfo &	758	const sockinfo &
639	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
640	{	760	{
641	if (!si.valid ())	761	if (!si.valid ())
642	{	762	{
643	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
644		764
645	if (r)	765	if (r)
646	{	766	{
647	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
648	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
649	return r->si;	769	return r->si;
650	}	770	}
651	else	771	else
652	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
653	conf->nodename);	773	conf->nodename);
654	}	774	}
655		775
656	return si;	776	return si;
657	}	777	}
658		778
659	void	779	void
660	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	780	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
661	{	781	{
662	bool ok;	782	if (!vpn->send_vpn_packet (pkt, si, tos))
663
664	switch (si.prot)
665	{
666	case PROT_IPv4:
667	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
668	case PROT_UDPv4:
669	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
670	#if ENABLE_TCP
671	case PROT_TCPv4:
672	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
673	#endif
674	#if ENABLE_ICMP
675	case PROT_ICMPv4:
676	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
677	#endif
678	#if ENABLE_DNS
679	case PROT_DNSv4:
680	ok = send_dnsv4_packet (pkt, si, tos); break;
681	#endif
682
683	default:
684	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
685	ok = false;
686	}
687
688	if (!ok)
689	reset_connection ();	783	reset_connection ();
690	}	784	}
691		785
692	void	786	void
693	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
694	{	788	{
695	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
696		790
697	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);
698	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
699		795
700	delete pkt;	796	delete pkt;
701	}	797	}
702		798
…		…
717	void	813	void
718	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
719	{	815	{
720	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);
721		817
722	rsachallenge chg;	818	generate_auth_data ();
723	rsa_cache.gen (pkt->id, chg);
724	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
725		820
726	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);
727
728	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
729		823
730	delete pkt;	824	delete pkt;
731	}	825	}
732		826
733	void	827	void
734	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
735	{	829	{
736	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
737		831
738	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
739		834
740	rsa_hash (id, chg, pkt->response);
741
742	pkt->hmac_set (octx);
743
744	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
745
746	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
747		837
748	delete pkt;	838	delete pkt;
749	}	839	}
750		840
751	void	841	void
752	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
753	{	843	{
754	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
755	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
756		847
757	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);
758		849
759	r->hmac_set (octx);	850	r->hmac_set (octx);
760	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
761		852
762	delete r;	853	delete r;
763	}	854	}
764		855
765	void	856	inline void
766	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
767	{	858	{
768	if (!ictx	859	if (!(ictx && octx)
769	&& conf != THISNODE	860	&& conf != THISNODE
770	&& connectmode != conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
771	&& connectmode != conf_node::C_DISABLED	862	&& connectmode != conf_node::C_DISABLED
772	&& NOW > w.at)	863	&& !w.is_active ())
773	{	864	{
774	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
775		866	// and stop trying. should probably be handled by a per-connection expire handler.
776	if (retry_int < conf->max_retry)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
777	retry_cnt++;	870	return;
778	else	871	}
779	retry_int = conf->max_retry;
780		872
781	w.start (NOW + retry_int);	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
782		878
783	reset_si ();	879	reset_si ();
784		880
785	if (si.prot && !si.host)	881	bool slow = si.prot & PROT_SLOW;
		882
		883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/*TODO*/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
786	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
787	else	889	else
788	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
789	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow || (dsi.prot & PROT_SLOW);
790		898
791	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
792	{	900	{
793	if (retry_cnt < 4)	901	if (retry_cnt < 4)
794	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
795	else	903	else
796	send_ping (dsi, 0);	904	send_ping (dsi, 0);
797	}	905	}
798	}	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);
799	}	916	}
800	}	917	}
801		918
802	void	919	void
803	connection::reset_connection ()	920	connection::reset_connection ()
…		…
806	{	923	{
807	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
808	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
809		926
810	if (::conf.script_node_down)	927	if (::conf.script_node_down)
811	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	}
812	}	933	}
813		934
814	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
815	delete octx; octx = 0;	936	delete octx; octx = 0;
816		937
817	si.host = 0;	938	si.host = 0;
818		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
819	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
820	retry_cnt = 0;	946	retry_cnt = 0;
821		947
822	rekey.stop ();	948	rekey.stop ();
823	keepalive.stop ();	949	keepalive.stop ();
824	establish_connection.stop ();	950	establish_connection.stop ();
…		…
831	send_reset (si);	957	send_reset (si);
832		958
833	reset_connection ();	959	reset_connection ();
834	}	960	}
835		961
836	void	962	// poor-man's rekeying
837	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
838	{	965	{
839	reset_connection ();	966	reset_connection ();
840	establish_connection ();	967	establish_connection ();
841	}	968	}
842		969
…		…
858	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
859	rekey ();	986	rekey ();
860	}	987	}
861		988
862	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
863	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1000	connection::inject_data_packet (tap_packet *pkt)
864	{	1001	{
865	if (ictx && octx)	1002	if (ictx && octx)
866	send_data_packet (pkt);	1003	send_data_packet (pkt);
867	else	1004	else
868	{	1005	{
869	if (!broadcast)//DDDD
870	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
871		1007	post_inject_queue ();
872	establish_connection ();
873	}	1008	}
874	}	1009	}
875		1010
		1011	void
876	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
877	{	1013	{
878	if (ictx && octx)	1014	if (ictx && octx)
879	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
880	else	1016	else
881	{	1017	{
882	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
883		1019	post_inject_queue ();
884	establish_connection ();
885	}	1020	}
886	}	1021	}
887		1022
888	void	1023	void
889	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
890	{	1025	{
891	last_activity = NOW;	1026	last_activity = ev_now ();
892		1027
893	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.",
894	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;
895		1033
896	switch (pkt->typ ())	1034	switch (pkt->typ ())
897	{	1035	{
898	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
899	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
900	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
901	// when we receive a ping.	1041	// when we receive a ping.
902	if (!ictx)	1042	if (!ictx)
903	{	1043	{
904	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
905	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
906	}	1046	}
907	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
908	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
909		1051
910	break;	1052	break;
911		1053
912	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
913	break;	1060	break;
914		1061
915	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
916	{	1063	{
917	reset_connection ();	1064	reset_connection ();
918		1065
919	config_packet *p = (config_packet *) pkt;	1066	config_packet *p = (config_packet *) pkt;
920		1067
921	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
922	{
923	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
924	conf->nodename, (const char *)rsi);
925	connectmode = conf_node::C_DISABLED;
926	}
927	else if (connectmode == conf_node::C_ALWAYS)
928	establish_connection ();	1069	establish_connection ();
929	}	1070	}
930	break;	1071	break;
931		1072
932	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
933	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
934	{	1075	{
935	auth_req_packet *p = (auth_req_packet *) pkt;	1076	auth_req_packet *p = (auth_req_packet *)pkt;
936		1077
937	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
938		1081
939	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
940	{	1088	{
941	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
942	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
943	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
944	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
945		1093
946	if (p->initiate)	1094	if (p->initiate)
947	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
948		1096
949	rsachallenge k;	1097	auth_data auth;
950		1098
951	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
952	{	1100	{
953	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
954	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
955	break;
956	}	1103	}
957	else	1104	else
958	{	1105	{
959	delete octx;	1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
960		1107
961	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
962	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
963		1110
964	// compatibility code, remove when no longer required	1111	send_auth_response (rsi);
965	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
966		1112
		1113	if (chg)
		1114	{
967	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
968	features = p->features & config_packet::get_features ();	1116	features = p->features & config_packet::get_features ();
969		1117
970	send_auth_response (rsi, p->id, k);
971
972	connection_established ();	1118	connection_established (rsi);
973
974	break;	1119	}
975	}	1120	}
		1121
		1122	break;
976	}	1123	}
977	else
978	slog (L_WARN, _("%s(%s): protocol mismatch"),
979	conf->nodename, (const char *)rsi);
980		1124
981	send_reset (rsi);	1125	send_reset (rsi);
982	}	1126	}
983		1127
984	break;	1128	break;
985		1129
986	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
987	{	1131	{
988	auth_res_packet *p = (auth_res_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
989		1133
990	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
991		1135
992	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
993	{	1140	{
994	if (p->prot_minor != PROTOCOL_MINOR)
995	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
996	conf->nodename, (const char *)rsi,
997	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
998
999	rsachallenge chg;
1000
1001	if (!rsa_cache.find (p->id, chg))
1002	{
1003	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1004	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
1005	break;
1006	}	1143	}
1007	else	1144	else if (!have_snd_auth)
1008	{	1145	{
1009	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1010		1147
1011	if (!p->hmac_chk (cctx))	1148	have_snd_auth = true;
1012	{
1013	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1014	"could be an attack, or just corruption or a synchronization error"),
1015	conf->nodename, (const char *)rsi);
1016	break;
1017	}
1018	else
1019	{
1020	rsaresponse h;
1021
1022	rsa_hash (p->id, chg, h);
1023
1024	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1025	{
1026	prot_minor = p->prot_minor;
1027
1028	delete ictx; ictx = cctx;
1029
1030	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1031
1032	si = rsi;
1033	protocol = rsi.prot;
1034
1035	connection_established ();	1149	connection_established (rsi);
1036
1037	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1038	conf->nodename, (const char *)rsi,
1039	p->prot_major, p->prot_minor);
1040
1041	if (::conf.script_node_up)
1042	run_script (run_script_cb (this, &connection::script_node_up), false);
1043
1044	break;
1045	}
1046	else
1047	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1048	conf->nodename, (const char *)rsi);
1049	}
1050
1051	delete cctx;
1052	}
1053	}	1150	}
1054	}	1151	}
1055
1056	send_reset (rsi);
1057	break;	1152	break;
1058		1153
1059	case vpn_packet::PT_DATA_COMPRESSED:	1154	case vpn_packet::PT_DATA_COMPRESSED:
1060	#if !ENABLE_COMPRESSION	1155	#if !ENABLE_COMPRESSION
1061	send_reset (rsi);	1156	send_reset (rsi);
…		…
1068	{	1163	{
1069	vpndata_packet *p = (vpndata_packet *)pkt;	1164	vpndata_packet *p = (vpndata_packet *)pkt;
1070		1165
1071	if (!p->hmac_chk (ictx))	1166	if (!p->hmac_chk (ictx))
1072	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1167	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1073	"could be an attack, or just corruption or a synchronization error"),	1168	"could be an attack, or just corruption or a synchronization error."),
1074	conf->nodename, (const char *)rsi);	1169	conf->nodename, (const char *)rsi);
1075	else	1170	else
1076	{	1171	{
1077	u32 seqno;	1172	u32 seqno;
1078	tap_packet *d = p->unpack (this, seqno);	1173	tap_packet *d = p->unpack (this, seqno);
		1174	int seqclass = iseqno.seqno_classify (seqno);
1079		1175
1080	if (iseqno.recv_ok (seqno))	1176	if (seqclass == 0) // ok
1081	{	1177	{
1082	vpn->tap->send (d);	1178	vpn->tap->send (d);
1083		1179
1084	if (si != rsi)	1180	if (si != rsi)
1085	{	1181	{
1086	// fast re-sync on connection changes, useful especially for tcp/ip	1182	// fast re-sync on source address changes, useful especially for tcp/ip
		1183	//if (last_si_change < ev_now () + 5.)
1087	si = rsi;	1184	// {
1088
1089	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1185	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1090	conf->nodename, (const char *)si, (const char *)rsi);	1186	conf->nodename, (const char *)si, (const char *)rsi);
		1187
		1188	si = rsi;
		1189
		1190	if (::conf.script_node_change)
		1191	{
		1192	run_script_cb *cb = new run_script_cb;
		1193	cb->set<connection, &connection::script_node_change> (this);
		1194	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1195	}
		1196
		1197	// }
		1198	//else
		1199	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1200	// conf->nodename, (const char *)si, (const char *)rsi);
1091	}	1201	}
		1202	}
		1203	else if (seqclass == 1) // far history
		1204	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1205	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1206	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1207	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1208	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1209	else if (seqclass == 3) // reset
		1210	{
		1211	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1212	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1213	send_reset (rsi);
1092	}	1214	}
1093		1215
1094	delete d;	1216	delete d;
1095	break;	1217	break;
1096	}	1218	}
…		…
1100	break;	1222	break;
1101		1223
1102	case vpn_packet::PT_CONNECT_REQ:	1224	case vpn_packet::PT_CONNECT_REQ:
1103	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1225	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1104	{	1226	{
1105	connect_req_packet *p = (connect_req_packet *) pkt;	1227	connect_req_packet *p = (connect_req_packet *)pkt;
1106		1228
1107	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1229	if (p->id > 0 && p->id <= vpn->conns.size ())
1108	connection *c = vpn->conns[p->id - 1];
1109	conf->protocols = p->protocols;
1110
1111	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1112	conf->id, p->id, c->ictx && c->octx);
1113
1114	if (c->ictx && c->octx)
1115	{	1230	{
		1231	connection *c = vpn->conns[p->id - 1];
		1232	conf->protocols = p->protocols;
		1233
		1234	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1235	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1236	p->protocols,
		1237	c->ictx && c->octx);
		1238
		1239	if (c->ictx && c->octx)
		1240	{
1116	// send connect_info packets to both sides, in case one is	1241	// send connect_info packets to both sides, in case one is
1117	// behind a nat firewall (or both ;)	1242	// behind a nat firewall (or both ;)
1118	c->send_connect_info (conf->id, si, conf->protocols);	1243	c->send_connect_info (conf->id, si, conf->protocols);
1119	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1244	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1245	}
		1246	else
		1247	c->establish_connection ();
1120	}	1248	}
1121	else	1249	else
1122	c->establish_connection ();	1250	slog (L_WARN,
		1251	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1252	p->id);
1123	}	1253	}
1124		1254
1125	break;	1255	break;
1126		1256
1127	case vpn_packet::PT_CONNECT_INFO:	1257	case vpn_packet::PT_CONNECT_INFO:
1128	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1129	{	1259	{
1130	connect_info_packet *p = (connect_info_packet *)pkt;	1260	connect_info_packet *p = (connect_info_packet *)pkt;
1131		1261
1132	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1133	{	1263	{
1134	connection *c = vpn->conns[p->id - 1];	1264	connection *c = vpn->conns[p->id - 1];
1135		1265
1136	c->conf->protocols = p->protocols;	1266	c->conf->protocols = p->protocols;
1137	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1267	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1138	p->si.upgrade_protocol (protocol, c->conf);	1268	p->si.upgrade_protocol (protocol, c->conf);
1139		1269
1140	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1270	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1141	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1271	conf->nodename,
		1272	vpn->conns[p->id - 1]->conf->nodename,
		1273	(const char *)p->si,
		1274	p->protocols,
		1275	protocol,
		1276	p->si.supported_protocols (c->conf),
		1277	!c->ictx && !c->octx);
1142		1278
1143	const sockinfo &dsi = forward_si (p->si);	1279	const sockinfo &dsi = forward_si (p->si);
1144		1280
1145	if (dsi.valid ())	1281	if (dsi.valid ())
1146	c->send_auth_request (dsi, true);	1282	c->send_auth_request (dsi, true);
		1283	else
		1284	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1285	vpn->conns[p->id - 1]->conf->nodename,
		1286	(const char *)p->si);
1147	}	1287	}
		1288	else
		1289	slog (L_WARN,
		1290	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1291	p->id);
1148	}	1292	}
1149		1293
1150	break;	1294	break;
1151		1295
1152	default:	1296	default:
1153	send_reset (rsi);	1297	send_reset (rsi);
1154	break;	1298	break;
1155	}	1299	}
1156	}	1300	}
1157		1301
1158	void connection::keepalive_cb (time_watcher &w)	1302	inline void
		1303	connection::keepalive_cb (ev::timer &w, int revents)
1159	{	1304	{
1160	if (NOW >= last_activity + ::conf.keepalive + 30)	1305	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1306
		1307	if (when >= 0)
		1308	w.start (when);
		1309	else if (when < -15)
1161	{	1310	{
1162	reset_connection ();	1311	reset_connection ();
1163	establish_connection ();	1312	establish_connection ();
1164	}	1313	}
1165	else if (NOW < last_activity + ::conf.keepalive)
1166	w.start (last_activity + ::conf.keepalive);
1167	else if (conf->connectmode != conf_node::C_ONDEMAND	1314	else if (conf->connectmode != conf_node::C_ONDEMAND
1168	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1315	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1169	{	1316	{
		1317	w.start (3);
1170	send_ping (si);	1318	send_ping (si);
1171	w.start (NOW + 5);
1172	}	1319	}
1173	else if (NOW < last_activity + ::conf.keepalive + 10)	1320	else if (when >= -10)
1174	// hold ondemand connections implicitly a few seconds longer	1321	// hold ondemand connections implicitly a few seconds longer
1175	// should delete octx, though, or something like that ;)	1322	// should delete octx, though, or something like that ;)
1176	w.start (last_activity + ::conf.keepalive + 10);	1323	w.start (when + 10);
1177	else	1324	else
1178	reset_connection ();	1325	reset_connection ();
1179	}	1326	}
1180		1327
		1328	void
1181	void connection::send_connect_request (int id)	1329	connection::send_connect_request (int id)
1182	{	1330	{
1183	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1331	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1184		1332
1185	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1333	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1334	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1335	THISNODE->protocols);
1186	p->hmac_set (octx);	1336	p->hmac_set (octx);
1187	send_vpn_packet (p, si);	1337	send_vpn_packet (p, si);
1188		1338
1189	delete p;	1339	delete p;
1190	}	1340	}
1191		1341
1192	void connection::script_node ()	1342	void
		1343	connection::script_init_env (const char *ext)
1193	{	1344	{
1194	vpn->script_if_up ();
1195
1196	char *env;	1345	char *env;
		1346	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1347	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1348	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1349	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1350	conf->id & 0xff); putenv (env);
		1351	}
		1352
		1353	void
		1354	connection::script_init_connect_env ()
		1355	{
		1356	vpn->script_init_env ();
		1357
		1358	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1359	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1360	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1364	}
1202		1365
		1366	inline const char *
1203	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1204	{	1368	{
1205	script_node ();	1369	script_init_connect_env ();
1206		1370
1207	putenv ("STATE=up");	1371	putenv ((char *)"STATE=up");
1208		1372
		1373	char *filename;
		1374	asprintf (&filename,
		1375	"%s/%s",
		1376	confbase,
1209	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1210	}
1211		1378
		1379	return filename;
		1380	}
		1381
		1382	inline const char *
		1383	connection::script_node_change ()
		1384	{
		1385	script_init_connect_env ();
		1386
		1387	putenv ((char *)"STATE=change");
		1388
		1389	char *filename;
		1390	asprintf (&filename,
		1391	"%s/%s",
		1392	confbase,
		1393	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1394
		1395	return filename;
		1396	}
		1397
		1398	inline const char *
1212	const char *connection::script_node_down ()	1399	connection::script_node_down ()
1213	{	1400	{
1214	script_node ();	1401	script_init_connect_env ();
1215		1402
1216	putenv ("STATE=down");	1403	putenv ((char *)"STATE=down");
1217		1404
1218	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1405	char *filename;
		1406	asprintf (&filename,
		1407	"%s/%s",
		1408	confbase,
		1409	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1410
		1411	return filename;
1219	}	1412	}
1220		1413
1221	connection::connection (struct vpn *vpn, conf_node *conf)	1414	connection::connection (struct vpn *vpn, conf_node *conf)
1222	: vpn(vpn), conf(conf)	1415	: vpn(vpn), conf(conf),
1223	, rekey (this, &connection::rekey_cb)
1224	, keepalive (this, &connection::keepalive_cb)
1225	, establish_connection (this, &connection::establish_connection_cb)
1226	#if ENABLE_DNS	1416	#if ENABLE_DNS
1227	, dnsv4_tw (this, &connection::dnsv4_cb)	1417	dns (0),
1228	, dns_rcvdq (0), dns_snddq (0)
1229	, dns_rcvseq (0), dns_sndseq (0)
1230	#endif	1418	#endif
		1419	data_queue(conf->max_ttl, conf->max_queue + 1),
		1420	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1231	{	1421	{
		1422	rekey .set<connection, &connection::rekey_cb > (this);
		1423	keepalive .set<connection, &connection::keepalive_cb > (this);
		1424	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1425
		1426	last_establish_attempt = 0.;
1232	octx = ictx = 0;	1427	octx = ictx = 0;
1233	retry_cnt = 0;
1234		1428
1235	if (!conf->protocols) // make sure some protocol is enabled	1429	connectmode = conf->connectmode;
1236	conf->protocols = PROT_UDPv4;
1237		1430
1238	connectmode = conf_node::C_ALWAYS; // initial setting	1431	// queue a dummy packet to force an initial connection attempt
		1432	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1433	vpn_queue.put (new net_packet);
		1434
1239	reset_connection ();	1435	reset_connection ();
1240	}	1436	}
1241		1437
1242	connection::~connection ()	1438	connection::~connection ()
1243	{	1439	{
1244	shutdown ();	1440	shutdown ();
1245	}	1441	}
1246		1442
		1443	void
1247	void connection_init ()	1444	connection_init ()
1248	{	1445	{
1249	auth_rate_limiter.clear ();	1446	auth_rate_limiter.clear ();
1250	reset_rate_limiter.clear ();	1447	reset_rate_limiter.clear ();
1251	}	1448	}
1252		1449

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