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Comparing gvpe/src/connection.C (file contents):
Revision 1.6 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.101 by root, Wed Jul 17 16:40:57 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "PORN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb *cb, const char *warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	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);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	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)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		126	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		127	kdf.extract (s, sizeof (s));
		128	kdf.extract_done (HKDF_PRF_HASH ());
		129	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		130
		131	HMAC_CTX_init (&hctx);
		132	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		141	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		142	kdf.extract (s, sizeof (s));
		143	kdf.extract_done (HKDF_PRF_HASH ());
		144	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		145
57	EVP_CIPHER_CTX_init (&cctx);	146	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	147	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	148	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	149	}
62		150
63	crypto_ctx::~crypto_ctx ()	151	crypto_ctx::~crypto_ctx ()
64	{	152	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	153	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	154	HMAC_CTX_cleanup (&hctx);
67	}	155	}
68		156
		157	static inline void
		158	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		159	{
		160	if (RSA_public_encrypt (sizeof (auth.rsa),
		161	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		162	key, RSA_PKCS1_OAEP_PADDING) < 0)
		163	fatal ("RSA_public_encrypt error");
		164
		165	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		166	}
		167
		168	static inline bool
		169	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		170	{
		171	u8 rsa_decrypt[RSA_KEYLEN];
		172
		173	if (RSA_private_decrypt (sizeof (encr.rsa),
		174	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		175	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		176	return 0;
		177
		178	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		179	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		180
		181	return 1;
		182	}
		183
69	static void	184	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	185	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	186	{
72	EVP_MD_CTX ctx;	187	HMAC_CTX ctx;
73		188
74	EVP_MD_CTX_init (&ctx);	189	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	190	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	191	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	192	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	193	HMAC_CTX_cleanup (&ctx);
80	}	194	}
81		195
82	struct rsa_entry {	196	void
83	tstamp expire;	197	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	198	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	199	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	200	{
		201	// request data
		202	rand_fill (snd_auth.rsa);
		203	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		204	auth_hash (snd_auth, snd_auth_mac);
131		205
132	} rsa_cache;	206	// eventual response data
133		207	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	208	}
140	w.at = NOW + RSA_TTL;
141		209
142	for (iterator i = begin (); i != end (); )	210	// every use prolongs the expiry
143	if (i->expire <= NOW)	211	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	212	}
149		213
150	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
151		215
152	void pkt_queue::put (tap_packet *p)	216	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		217	: max_ttl (max_ttl), max_queue (max_queue)
153	{	218	{
154	if (queue[i])	219	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		220
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	221	i = 0;
182	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	225	}
184		226
185	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
186	{	228	{
187	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
188	delete queue[i];	232	delete [] queue;
189	}	233	}
190		234
		235	void
		236	pkt_queue::expire_cb (ev::timer &w, int revents)
		237	{
		238	ev_tstamp expire = ev_now () - max_ttl;
		239
		240	for (;;)
		241	{
		242	if (empty ())
		243	break;
		244
		245	double diff = queue[j].tstamp - expire;
		246
		247	if (diff >= 0.)
		248	{
		249	w.start (diff > 0.5 ? diff : 0.5);
		250	break;
		251	}
		252
		253	delete get ();
		254	}
		255	}
		256
		257	void
		258	pkt_queue::put (net_packet *p)
		259	{
		260	ev_tstamp now = ev_now ();
		261
		262	// start expiry timer
		263	if (empty ())
		264	expire.start (max_ttl);
		265
		266	int ni = i + 1 == max_queue ? 0 : i + 1;
		267
		268	if (ni == j)
		269	delete get ();
		270
		271	queue[i].pkt = p;
		272	queue[i].tstamp = now;
		273
		274	i = ni;
		275	}
		276
		277	net_packet *
		278	pkt_queue::get ()
		279	{
		280	if (empty ())
		281	return 0;
		282
		283	net_packet *p = queue[j].pkt;
		284	queue[j].pkt = 0;
		285
		286	j = j + 1 == max_queue ? 0 : j + 1;
		287
		288	return p;
		289	}
		290
191	struct net_rateinfo {	291	struct net_rateinfo
		292	{
192	u32 host;	293	u32 host;
193	double pcnt, diff;	294	double pcnt, diff;
194	tstamp last;	295	tstamp last;
195	};	296	};
196		297
197	// only do action once every x seconds per host whole allowing bursts.	298	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	299	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	300	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	301	struct net_rate_limiter : list<net_rateinfo>
201	{	302	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	303	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	304	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	305	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		306	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		307
206	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	309	bool can (u32 host);
208	};	310	};
209		311
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		313
		314	bool
212	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
213	{	316	{
214	iterator i;	317	iterator i;
215		318
216	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
217	if (i->host == host)	320	if (i->host == host)
218	break;	321	break;
219	else if (i->last < NOW - EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	323	i = erase (i);
221	else	324	else
222	i++;	325	i++;
223		326
224	if (i == end ())	327	if (i == end ())
225	{	328	{
226	net_rateinfo ri;	329	net_rateinfo ri;
227		330
228	ri.host = host;	331	ri.host = host;
229	ri.pcnt = 1.;	332	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	333	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	334	ri.last = ev_now ();
232		335
233	push_front (ri);	336	push_front (ri);
234		337
235	return true;	338	return true;
236	}	339	}
237	else	340	else
238	{	341	{
239	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
240	erase (i);	343	erase (i);
241		344
242	ri.pcnt = ri.pcnt * ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		347
245	ri.last = NOW;	348	ri.last = ev_now ();
246		349
		350	double dif = ri.diff / ri.pcnt;
		351
247	bool send = ri.diff / ri.pcnt > CUTOFF;	352	bool send = dif > NRL_CUTOFF;
248		353
		354	if (dif > NRL_MAXDIF)
		355	{
		356	ri.pcnt = 1.;
		357	ri.diff = NRL_MAXDIF;
		358	}
249	if (send)	359	else if (send)
250	ri.pcnt++;	360	ri.pcnt++;
251		361
252	push_front (ri);	362	push_front (ri);
253		363
254	return send;	364	return send;
…		…
257		367
258	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
259		369
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
261		371
		372	void
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
263	{	374	{
264	unsigned int xlen;	375	unsigned int xlen;
265		376
266	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
267		378
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	379	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	380	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
270	len - sizeof (hmac_packet));	381	len - sizeof (hmac_packet)));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	382	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
272	}	383	}
273		384
274	void	385	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	386	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	387	{
…		…
285	hmac_gen (ctx);	396	hmac_gen (ctx);
286		397
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	399	}
289		400
		401	void
290	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	403	{
292	type = type_;	404	type = type_;
293		405
294	int src = THISNODE->id;	406	int src = THISNODE->id;
295		407
…		…
299	}	411	}
300		412
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		415
304	struct vpndata_packet:vpn_packet	416	struct vpndata_packet : vpn_packet
		417	{
		418	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		419
		420	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		421	tap_packet *unpack (connection *conn, u32 &seqno);
		422
		423	private:
		424	const u32 data_hdr_size () const
305	{	425	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307
308	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
309	tap_packet *unpack (connection *conn, u32 &seqno);
310	private:
311
312	const u32 data_hdr_size () const
313	{
314	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	427	}
		428	};
317		429
318	void	430	void
319	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	431	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
320	{	432	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	434	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
324		436
325	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
327	u32 cl;
328		439
		440	if (conn->features & FEATURE_COMPRESSION)
		441	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		443
330	if (cl)	444	if (cl)
331	{	445	{
332	type = PT_DATA_COMPRESSED;	446	type = PT_DATA_COMPRESSED;
333	d = cdata;	447	d = cdata;
334	l = cl + 2;	448	l = cl + 2;
335		449
336	d[0] = cl >> 8;	450	d[0] = cl >> 8;
337	d[1] = cl;	451	d[1] = cl;
		452	}
338	}	453	}
339	#endif	454	#endif
340		455
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	456	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		457
343	struct {	458	struct {
344	#if RAND_SIZE	459	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	460	u8 rnd[RAND_SIZE];
346	#endif	461	#endif
347	u32 seqno;	462	u32 seqno;
348	} datahdr;	463	} datahdr;
349		464
350	datahdr.seqno = ntohl (seqno);	465	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	466	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	467	require (RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE) >= 0);
353	#endif	468	#endif
354		469
355	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	473	outl += outl2;
359		474
360	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	477	(unsigned char *) d, l));
363	outl += outl2;	478	outl += outl2;
364		479
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	481	outl += outl2;
367		482
368	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
369		484
370	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	494	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
381	u8 *d;	496	u8 *d;
382	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
383		498
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		500
386	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
388		503
389	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	505	d = cdata;
391	else	506	else
392	#endif	507	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
394		509
395	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	518	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	520	outl += outl2;
400		521
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	523	outl += outl2;
403		524
404	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	525	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
405		526
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	552	}
432	};	553	};
433		554
434	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
435	{	556	{
436	// actually, hmaclen cannot be checked because the hmac
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
442
443	const u8 curflags () const
444	{
445	return 0x80
446	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}
448		560
449	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
450	bool chk_config () const;	562	bool chk_config () const;
		563
		564	static u8 get_features ()
		565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f |= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f |= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
		576	return f;
		577	}
451	};	578	};
452		579
		580	void
453	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
454	{	582	{
455	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	586	flags = 0;
459	flags = curflags ();	587	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		588
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		591	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		592
466	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	594	set_hdr (type, dst);
468	}	595	}
469		596
		597	bool
470	bool config_packet::chk_config () const	598	config_packet::chk_config () const
471	{	599	{
472	return prot_major == PROTOCOL_MAJOR	600	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	601	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	602	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	603	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
476	&& challengelen == sizeof (rsachallenge)
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	605	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	606	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
480	}	607	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		608	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		609	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		610	else
		611	return true;
481		612
		613	return false;
		614	}
		615
482	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
483	{	617	{
484	char magic[8];	618	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	621	u8 pad2, pad3;
488	rsaid id;	622	auth_encr encr;
489	rsaencrdata encr;
490		623
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	625	{
493	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	628	initiate = !!initiate_;
496	protocols = protocols_;	629	protocols = protocols_;
497		630
498	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
499	}	632	}
500	};	633	};
501		634
502	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
503	{	636	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	637	auth_response response;
508		638
509	auth_res_packet (int dst)	639	auth_res_packet (int dst)
510	{	640	{
511	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
512		642
…		…
546	};	676	};
547		677
548	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
549		679
550	void	680	void
		681	connection::connection_established (const sockinfo &rsi)
		682	{
		683	if (!have_snd_auth || !have_rcv_auth)
		684	return;
		685
		686	si = rsi;
		687	protocol = rsi.prot;
		688
		689	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		690	conf->nodename, (const char *)rsi,
		691	is_direct ? "direct" : "forwarded",
		692	PROTOCOL_MAJOR, prot_minor);
		693
		694	if (::conf.script_node_up)
		695	{
		696	run_script_cb *cb = new run_script_cb;
		697	cb->set<connection, &connection::script_node_up> (this);
		698	run_script_queued (cb, _("node-up command execution failed, continuing."));
		699	}
		700
		701	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		702	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		703
		704	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		705	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		706
		707	if (ictx && octx)
		708	{
		709	// make sure rekeying timeouts are slightly asymmetric
		710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		711	rekey.start (rekey_interval, rekey_interval);
		712
		713	keepalive.start (::conf.keepalive);
		714
		715	// send queued packets
		716	if (ictx && octx)
		717	{
		718	while (tap_packet *p = (tap_packet *)data_queue.get ())
		719	{
		720	if (p->len) send_data_packet (p);
		721	delete p;
		722	}
		723
		724	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		725	{
		726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		727	delete p;
		728	}
		729	}
		730
		731	vpn->connection_established (this);
		732	}
		733	#if 0
		734	else
		735	{
		736	retry_cnt = 0;
		737	establish_connection.start (5);
		738	keepalive.stop ();
		739	rekey.stop ();
		740	}
		741	#endif
		742	}
		743
		744	void
551	connection::reset_dstaddr ()	745	connection::reset_si ()
552	{	746	{
		747	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	748	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		749	else
555	// mask out protocols we cannot establish	750	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	751	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	752	protocol = 0;
		753	}
558		754
559	si.set (conf, protocol);	755	si.set (conf, protocol);
560	}
561		756
562	void	757	is_direct = si.valid ();
563	connection::send_ping (const sockinfo &si, u8 pong)
564	{
565	ping_packet *pkt = new ping_packet;
566
567	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
568	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
569
570	delete pkt;
571	}	758	}
572		759
573	void	760	// ensure sockinfo is valid, forward if necessary
		761	const sockinfo &
574	connection::send_reset (const sockinfo &si)	762	connection::forward_si (const sockinfo &si) const
575	{	763	{
576	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	764	if (!si.valid ())
577	{
578	config_packet *pkt = new config_packet;
579
580	pkt->setup (vpn_packet::PT_RESET, conf->id);
581	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);
582
583	delete pkt;
584	}	765	{
585	}	766	connection *r = vpn->find_router_for (this);
586		767
587	void	768	if (r)
588	connection::send_auth_request (const sockinfo &si, bool initiate)
589	{
590	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
591
592	rsachallenge chg;
593
594	rsa_cache.gen (pkt->id, chg);
595
596	if (0 > RSA_public_encrypt (sizeof chg,
597	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
598	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
599	fatal ("RSA_public_encrypt error");
600
601	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
602
603	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
604
605	delete pkt;
606	}
607
608	void
609	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
610	{
611	auth_res_packet *pkt = new auth_res_packet (conf->id);
612
613	pkt->id = id;
614
615	rsa_hash (id, chg, pkt->response);
616
617	pkt->hmac_set (octx);
618
619	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
620
621	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
622
623	delete pkt;
624	}
625
626	void
627	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
628	{
629	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
630	conf->id, rid, (const char *)rsi);
631
632	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
633
634	r->hmac_set (octx);
635	vpn->send_vpn_packet (r, si);
636
637	delete r;
638	}
639
640	void
641	connection::establish_connection_cb (time_watcher &w)
642	{
643	if (ictx || conf == THISNODE
644	|| connectmode == conf_node::C_NEVER
645	|| connectmode == conf_node::C_DISABLED)
646	w.at = TSTAMP_CANCEL;
647	else if (w.at <= NOW)
648	{
649	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
650
651	if (retry_int < 3600 * 8)
652	retry_cnt++;
653
654	w.at = NOW + retry_int;
655
656	if (conf->hostname)
657	{	769	{
658	reset_dstaddr ();	770	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659		771	conf->nodename, r->conf->nodename);
660	if (si.valid () && auth_rate_limiter.can (si))	772	return r->si;
661	{
662	if (retry_cnt < 4)
663	send_auth_request (si, true);
664	else
665	send_ping (si, 0);
666	}
667	}	773	}
668	else	774	else
		775	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		776	conf->nodename);
		777	}
		778
		779	return si;
		780	}
		781
		782	void
		783	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		784	{
		785	if (!vpn->send_vpn_packet (pkt, si, tos))
		786	reset_connection ();
		787	}
		788
		789	void
		790	connection::send_ping (const sockinfo &si, u8 pong)
		791	{
		792	ping_packet *pkt = new ping_packet;
		793
		794	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		795
		796	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		797	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		798
		799	delete pkt;
		800	}
		801
		802	void
		803	connection::send_reset (const sockinfo &si)
		804	{
		805	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		806	{
		807	config_packet *pkt = new config_packet;
		808
		809	pkt->setup (vpn_packet::PT_RESET, conf->id);
		810	send_vpn_packet (pkt, si, IPTOS_MINCOST);
		811
		812	delete pkt;
		813	}
		814	}
		815
		816	void
		817	connection::send_auth_request (const sockinfo &si, bool initiate)
		818	{
		819	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		820
		821	generate_auth_data ();
		822	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
		823
		824	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
		826
		827	delete pkt;
		828	}
		829
		830	void
		831	connection::send_auth_response (const sockinfo &si)
		832	{
		833	auth_res_packet *pkt = new auth_res_packet (conf->id);
		834
		835	auth_hash (rcv_auth, pkt->response.mac);
		836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
		837
		838	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
		839	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		840
		841	delete pkt;
		842	}
		843
		844	void
		845	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
		846	{
		847	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
		848	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		849	conf->protocols);
		850
		851	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
		852
		853	r->hmac_set (octx);
		854	send_vpn_packet (r, si);
		855
		856	delete r;
		857	}
		858
		859	inline void
		860	connection::establish_connection_cb (ev::timer &w, int revents)
		861	{
		862	if (!(ictx && octx)
		863	&& conf != THISNODE
		864	&& connectmode != conf_node::C_NEVER
		865	&& connectmode != conf_node::C_DISABLED
		866	&& !w.is_active ())
		867	{
		868	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		869	// and stop trying. should probably be handled by a per-connection expire handler.
		870	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		871	{
		872	reset_connection ();
		873	return;
		874	}
		875
		876	last_establish_attempt = ev_now ();
		877
		878	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		879	? (retry_cnt & 3) + 1
		880	: 1 << (retry_cnt >> 2));
		881
		882	reset_si ();
		883
		884	bool slow = si.prot & PROT_SLOW;
		885
		886	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		887	{
		888	/*TODO*/ /* start the timer so we don't recurse endlessly */
		889	w.start (1);
669	vpn->connect_request (conf->id);	890	vpn->send_connect_request (this);
		891	}
		892	else
		893	{
		894	if (si.valid ())
		895	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		896	conf->nodename, (const char *)si);
		897
		898	const sockinfo &dsi = forward_si (si);
		899
		900	slow = slow || (dsi.prot & PROT_SLOW);
		901
		902	if (dsi.valid () && auth_rate_limiter.can (dsi))
		903	{
		904	if (retry_cnt < 4)
		905	send_auth_request (dsi, true);
		906	else
		907	send_ping (dsi, 0);
		908	}
		909	}
		910
		911	retry_int *= slow ? 8. : 0.9;
		912
		913	if (retry_int < conf->max_retry)
		914	retry_cnt++;
		915	else
		916	retry_int = conf->max_retry;
		917
		918	w.start (retry_int);
670	}	919	}
671	}	920	}
672		921
673	void	922	void
674	connection::reset_connection ()	923	connection::reset_connection ()
…		…
677	{	926	{
678	slog (L_INFO, _("%s(%s): connection lost"),	927	slog (L_INFO, _("%s(%s): connection lost"),
679	conf->nodename, (const char *)si);	928	conf->nodename, (const char *)si);
680		929
681	if (::conf.script_node_down)	930	if (::conf.script_node_down)
682	run_script (run_script_cb (this, &connection::script_node_down), false);	931	{
		932	run_script_cb *cb = new run_script_cb;
		933	cb->set<connection, &connection::script_node_down> (this);
		934	run_script_queued (cb, _("node-down command execution failed, continuing."));
		935	}
683	}	936	}
684		937
685	delete ictx; ictx = 0;	938	delete ictx; ictx = 0;
686	delete octx; octx = 0;	939	delete octx; octx = 0;
687		940
688	si.host= 0;	941	si.host = 0;
689		942
		943	have_snd_auth = false;
		944	have_rcv_auth = false;
		945	auth_expire = 0.;
		946
690	last_activity = 0;	947	last_activity = 0.;
		948	//last_si_change = 0.;
691	retry_cnt = 0;	949	retry_cnt = 0;
692		950
693	rekey.reset ();	951	rekey.stop ();
694	keepalive.reset ();	952	keepalive.stop ();
695	establish_connection.reset ();	953	establish_connection.stop ();
696	}	954	}
697		955
698	void	956	void
699	connection::shutdown ()	957	connection::shutdown ()
700	{	958	{
…		…
702	send_reset (si);	960	send_reset (si);
703		961
704	reset_connection ();	962	reset_connection ();
705	}	963	}
706		964
707	void	965	// poor-man's rekeying
708	connection::rekey_cb (time_watcher &w)	966	inline void
		967	connection::rekey_cb (ev::timer &w, int revents)
709	{	968	{
710	w.at = TSTAMP_CANCEL;
711
712	reset_connection ();	969	reset_connection ();
713	establish_connection ();	970	establish_connection ();
714	}	971	}
715		972
716	void	973	void
717	connection::send_data_packet (tap_packet *pkt, bool broadcast)	974	connection::send_data_packet (tap_packet *pkt)
718	{	975	{
719	vpndata_packet *p = new vpndata_packet;	976	vpndata_packet *p = new vpndata_packet;
720	int tos = 0;	977	int tos = 0;
721		978
722	if (conf->inherit_tos	979	// I am not hilarious about peeking into packets, but so be it.
723	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	980	if (conf->inherit_tos && pkt->is_ipv4 ())
724	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
725	tos = (*pkt)[15] & IPTOS_TOS_MASK;	981	tos = (*pkt)[15] & IPTOS_TOS_MASK;
726		982
727	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	983	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
728	vpn->send_vpn_packet (p, si, tos);	984	send_vpn_packet (p, si, tos);
729		985
730	delete p;	986	delete p;
731		987
732	if (oseqno > MAX_SEQNO)	988	if (oseqno > MAX_SEQNO)
733	rekey ();	989	rekey ();
734	}	990	}
735		991
736	void	992	void
		993	connection::post_inject_queue ()
		994	{
		995	// force a connection every now and when when packets are sent (max 1/s)
		996	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		997	establish_connection.stop ();
		998
		999	establish_connection ();
		1000	}
		1001
		1002	void
737	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1003	connection::inject_data_packet (tap_packet *pkt)
738	{	1004	{
739	if (ictx && octx)	1005	if (ictx && octx)
740	send_data_packet (pkt, broadcast);	1006	send_data_packet (pkt);
741	else	1007	else
742	{	1008	{
743	if (!broadcast)//DDDD
744	queue.put (new tap_packet (*pkt));	1009	data_queue.put (new tap_packet (*pkt));
		1010	post_inject_queue ();
		1011	}
		1012	}
745		1013
746	establish_connection ();	1014	void
		1015	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1016	{
		1017	if (ictx && octx)
		1018	send_vpn_packet (pkt, si, tos);
		1019	else
		1020	{
		1021	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1022	post_inject_queue ();
747	}	1023	}
748	}	1024	}
749		1025
750	void	1026	void
751	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1027	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
752	{	1028	{
753	last_activity = NOW;	1029	last_activity = ev_now ();
754		1030
755	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1031	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
756	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1032	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1033
		1034	if (connectmode == conf_node::C_DISABLED)
		1035	return;
757		1036
758	switch (pkt->typ ())	1037	switch (pkt->typ ())
759	{	1038	{
760	case vpn_packet::PT_PING:	1039	case vpn_packet::PT_PING:
		1040	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1041
761	// we send pings instead of auth packets after some retries,	1042	// we send pings instead of auth packets after some retries,
762	// so reset the retry counter and establish a connection	1043	// so reset the retry counter and establish a connection
763	// when we receive a ping.	1044	// when we receive a ping.
764	if (!ictx)	1045	if (!ictx)
765	{	1046	{
766	if (auth_rate_limiter.can (rsi))	1047	if (auth_rate_limiter.can (rsi))
767	send_auth_request (rsi, true);	1048	send_auth_request (rsi, true);
768	}	1049	}
769	else	1050	else
		1051	// we would love to change the socket address here, but ping's aren't
		1052	// authenticated, so we best ignore it.
770	send_ping (rsi, 1); // pong	1053	send_ping (rsi, 1); // pong
771		1054
772	break;	1055	break;
773		1056
774	case vpn_packet::PT_PONG:	1057	case vpn_packet::PT_PONG:
		1058	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1059
		1060	// a PONG might mean that the other side doesn't really know
		1061	// about our desire for communication.
		1062	establish_connection ();
775	break;	1063	break;
776		1064
777	case vpn_packet::PT_RESET:	1065	case vpn_packet::PT_RESET:
778	{	1066	{
779	reset_connection ();	1067	reset_connection ();
780		1068
781	config_packet *p = (config_packet *) pkt;	1069	config_packet *p = (config_packet *) pkt;
782		1070
783	if (!p->chk_config ())	1071	if (!p->chk_config ())
784	{	1072	{
785	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1073	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
786	conf->nodename, (const char *)rsi);	1074	conf->nodename, (const char *)rsi);
787	connectmode = conf_node::C_DISABLED;	1075	connectmode = conf_node::C_DISABLED;
788	}	1076	}
789	else if (connectmode == conf_node::C_ALWAYS)	1077	else if (connectmode == conf_node::C_ALWAYS)
790	establish_connection ();	1078	establish_connection ();
…		…
792	break;	1080	break;
793		1081
794	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
795	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
796	{	1084	{
797	auth_req_packet *p = (auth_req_packet *) pkt;	1085	auth_req_packet *p = (auth_req_packet *)pkt;
798		1086
799	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
800		1090
801	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
802	{	1092	{
803	if (p->prot_minor != PROTOCOL_MINOR)	1093	if (p->prot_minor != PROTOCOL_MINOR)
804	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1094	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
805	conf->nodename, (const char *)rsi,	1095	conf->nodename, (const char *)rsi,
806	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1096	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
807		1097
808	if (p->initiate)	1098	if (p->initiate)
809	send_auth_request (rsi, false);	1099	send_auth_request (rsi, false);
810		1100
811	rsachallenge k;	1101	auth_data auth;
812		1102
813	if (0 > RSA_private_decrypt (sizeof (p->encr),	1103	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
814	(unsigned char *)&p->encr, (unsigned char *)&k,	1104	{
815	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
816	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1105	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
817	conf->nodename, (const char *)rsi);	1106	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1107	}
818	else	1108	else
819	{	1109	{
820	retry_cnt = 0;	1110	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
821	establish_connection.start (NOW + 8); //? ;)
822	keepalive.reset ();
823	rekey.reset ();
824		1111
825	delete ictx;
826	ictx = 0;	1112	rcv_auth = auth;
		1113	have_rcv_auth = true;
827		1114
828	delete octx;	1115	send_auth_response (rsi);
829		1116
830	octx = new crypto_ctx (k, 1);	1117	if (chg)
831	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1118	{
832
833	conf->protocols = p->protocols;	1119	conf->protocols = p->protocols;
834	send_auth_response (rsi, p->id, k);	1120	features = p->features & config_packet::get_features ();
835		1121
		1122	connection_established (rsi);
836	break;	1123	}
837	}	1124	}
		1125
		1126	break;
838	}	1127	}
		1128	else
		1129	slog (L_WARN, _("%s(%s): protocol mismatch."),
		1130	conf->nodename, (const char *)rsi);
839		1131
840	send_reset (rsi);	1132	send_reset (rsi);
841	}	1133	}
842		1134
843	break;	1135	break;
844		1136
845	case vpn_packet::PT_AUTH_RES:	1137	case vpn_packet::PT_AUTH_RES:
846	{	1138	{
847	auth_res_packet *p = (auth_res_packet *) pkt;	1139	auth_res_packet *p = (auth_res_packet *)pkt;
848		1140
849	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1141	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
850		1142
851	if (p->chk_config ())	1143	if (p->chk_config ())
852	{	1144	{
853	if (p->prot_minor != PROTOCOL_MINOR)	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
854	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
855	conf->nodename, (const char *)rsi,
856	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
857
858	rsachallenge chg;
859
860	if (!rsa_cache.find (p->id, chg))
861	slog (L_ERR, _("%s(%s): unrequested auth response"),
862	conf->nodename, (const char *)rsi);
863	else
864	{	1146	{
865	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
866
867	if (!p->hmac_chk (cctx))
868	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
869	"could be an attack, or just corruption or an synchronization error"),
870	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
871	else
872	{
873	rsaresponse h;
874
875	rsa_hash (p->id, chg, h);
876
877	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
878	{
879	prot_minor = p->prot_minor;
880
881	delete ictx; ictx = cctx;
882
883	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
884
885	si = rsi;
886
887	rekey.start (NOW + ::conf.rekey);
888	keepalive.start (NOW + ::conf.keepalive);
889
890	// send queued packets
891	while (tap_packet *p = queue.get ())
892	{
893	send_data_packet (p);
894	delete p;
895	}
896
897	connectmode = conf->connectmode;
898
899	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
900	conf->nodename, (const char *)rsi,
901	strprotocol (protocol),
902	p->prot_major, p->prot_minor);
903
904	if (::conf.script_node_up)
905	run_script (run_script_cb (this, &connection::script_node_up), false);
906
907	break;
908	}
909	else
910	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
911	conf->nodename, (const char *)rsi);
912	}
913
914	delete cctx;
915	}	1149	}
		1150	else if (!have_snd_auth)
		1151	{
		1152	if (p->prot_minor != PROTOCOL_MINOR)
		1153	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1154	conf->nodename, (const char *)rsi,
		1155	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1156
		1157	prot_minor = p->prot_minor;
		1158	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1159
		1160	have_snd_auth = true;
		1161	connection_established (rsi);
		1162	}
		1163
		1164	break;
916	}	1165	}
917	}	1166	}
918		1167
919	send_reset (rsi);	1168	send_reset (rsi);
920	break;	1169	break;
…		…
929		1178
930	if (ictx && octx)	1179	if (ictx && octx)
931	{	1180	{
932	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
933		1182
934	if (rsi == si)	1183	if (!p->hmac_chk (ictx))
		1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1185	"could be an attack, or just corruption or a synchronization error."),
		1186	conf->nodename, (const char *)rsi);
		1187	else
935	{	1188	{
936	if (!p->hmac_chk (ictx))
937	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
938	"could be an attack, or just corruption or an synchronization error"),
939	conf->nodename, (const char *)rsi);
940	else	1189	u32 seqno;
		1190	tap_packet *d = p->unpack (this, seqno);
		1191	int seqclass = iseqno.seqno_classify (seqno);
		1192
		1193	if (seqclass == 0) // ok
941	{	1194	{
942	u32 seqno;	1195	vpn->tap->send (d);
943	tap_packet *d = p->unpack (this, seqno);
944		1196
945	if (iseqno.recv_ok (seqno))	1197	if (si != rsi)
946	{	1198	{
947	vpn->tap->send (d);	1199	// fast re-sync on source address changes, useful especially for tcp/ip
		1200	//if (last_si_change < ev_now () + 5.)
		1201	// {
		1202	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1203	conf->nodename, (const char *)si, (const char *)rsi);
948		1204
949	if (p->dst () == 0) // re-broadcast	1205	si = rsi;
950	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1206
		1207	if (::conf.script_node_change)
951	{	1208	{
952	connection *c = *i;	1209	run_script_cb *cb = new run_script_cb;
953		1210	cb->set<connection, &connection::script_node_change> (this);
954	if (c->conf != THISNODE && c->conf != conf)	1211	run_script_queued (cb, _("node-change command execution failed, continuing."));
955	c->inject_data_packet (d);
956	}	1212	}
957		1213
		1214	// }
958	delete d;	1215	//else
959		1216	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
960	break;	1217	// conf->nodename, (const char *)si, (const char *)rsi);
961	}	1218	}
962	}	1219	}
		1220	else if (seqclass == 1) // far history
		1221	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1222	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1223	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1224	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1225	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1226	else if (seqclass == 3) // reset
		1227	{
		1228	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1229	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1230	send_reset (rsi);
		1231	}
		1232
		1233	delete d;
		1234	break;
963	}	1235	}
964	else
965	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
966	}	1236	}
967		1237
968	send_reset (rsi);	1238	send_reset (rsi);
969	break;	1239	break;
970		1240
971	case vpn_packet::PT_CONNECT_REQ:	1241	case vpn_packet::PT_CONNECT_REQ:
972	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1242	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
973	{	1243	{
974	connect_req_packet *p = (connect_req_packet *) pkt;	1244	connect_req_packet *p = (connect_req_packet *)pkt;
975		1245
976	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1246	if (p->id > 0 && p->id <= vpn->conns.size ())
977	conf->protocols = p->protocols;
978	connection *c = vpn->conns[p->id - 1];
979
980	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
981	conf->id, p->id, c->ictx && c->octx);
982
983	if (c->ictx && c->octx)
984	{	1247	{
		1248	connection *c = vpn->conns[p->id - 1];
		1249	conf->protocols = p->protocols;
		1250
		1251	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1252	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1253	p->protocols,
		1254	c->ictx && c->octx);
		1255
		1256	if (c->ictx && c->octx)
		1257	{
985	// send connect_info packets to both sides, in case one is	1258	// send connect_info packets to both sides, in case one is
986	// behind a nat firewall (or both ;)	1259	// behind a nat firewall (or both ;)
987	c->send_connect_info (conf->id, si, conf->protocols);	1260	c->send_connect_info (conf->id, si, conf->protocols);
988	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1261	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1262	}
		1263	else
		1264	c->establish_connection ();
989	}	1265	}
		1266	else
		1267	slog (L_WARN,
		1268	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1269	p->id);
990	}	1270	}
991		1271
992	break;	1272	break;
993		1273
994	case vpn_packet::PT_CONNECT_INFO:	1274	case vpn_packet::PT_CONNECT_INFO:
995	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1275	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
996	{	1276	{
997	connect_info_packet *p = (connect_info_packet *) pkt;	1277	connect_info_packet *p = (connect_info_packet *)pkt;
998		1278
999	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1279	if (p->id > 0 && p->id <= vpn->conns.size ())
1000	conf->protocols = p->protocols;	1280	{
1001	connection *c = vpn->conns[p->id - 1];	1281	connection *c = vpn->conns[p->id - 1];
1002		1282
1003	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1283	c->conf->protocols = p->protocols;
1004	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1284	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1285	p->si.upgrade_protocol (protocol, c->conf);
1005		1286
		1287	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		1288	conf->nodename,
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si,
		1291	p->protocols,
		1292	protocol,
		1293	p->si.supported_protocols (c->conf),
		1294	!c->ictx && !c->octx);
		1295
		1296	const sockinfo &dsi = forward_si (p->si);
		1297
		1298	if (dsi.valid ())
1006	c->send_auth_request (p->si, true);	1299	c->send_auth_request (dsi, true);
		1300	else
		1301	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si);
		1304	}
		1305	else
		1306	slog (L_WARN,
		1307	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1308	p->id);
1007	}	1309	}
1008		1310
1009	break;	1311	break;
1010		1312
1011	default:	1313	default:
1012	send_reset (rsi);	1314	send_reset (rsi);
1013	break;	1315	break;
1014	}	1316	}
1015	}	1317	}
1016		1318
1017	void connection::keepalive_cb (time_watcher &w)	1319	inline void
		1320	connection::keepalive_cb (ev::timer &w, int revents)
1018	{	1321	{
1019	if (NOW >= last_activity + ::conf.keepalive + 30)	1322	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1323
		1324	if (when >= 0)
		1325	w.start (when);
		1326	else if (when < -15)
1020	{	1327	{
1021	reset_connection ();	1328	reset_connection ();
1022	establish_connection ();	1329	establish_connection ();
1023	}	1330	}
1024	else if (NOW < last_activity + ::conf.keepalive)
1025	w.at = last_activity + ::conf.keepalive;
1026	else if (conf->connectmode != conf_node::C_ONDEMAND	1331	else if (conf->connectmode != conf_node::C_ONDEMAND
1027	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1332	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1028	{	1333	{
		1334	w.start (3);
1029	send_ping (si);	1335	send_ping (si);
1030	w.at = NOW + 5;
1031	}	1336	}
		1337	else if (when >= -10)
		1338	// hold ondemand connections implicitly a few seconds longer
		1339	// should delete octx, though, or something like that ;)
		1340	w.start (when + 10);
1032	else	1341	else
1033	reset_connection ();	1342	reset_connection ();
1034	}	1343	}
1035		1344
		1345	void
1036	void connection::connect_request (int id)	1346	connection::send_connect_request (int id)
1037	{	1347	{
1038	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1348	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1039		1349
1040	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1350	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1351	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1352	THISNODE->protocols);
1041	p->hmac_set (octx);	1353	p->hmac_set (octx);
1042	vpn->send_vpn_packet (p, si);	1354	send_vpn_packet (p, si);
1043		1355
1044	delete p;	1356	delete p;
1045	}	1357	}
1046		1358
1047	void connection::script_node ()	1359	void
		1360	connection::script_init_env (const char *ext)
1048	{	1361	{
1049	vpn->script_if_up ();
1050
1051	char *env;	1362	char *env;
		1363	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1364	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1365	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1366	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1367	conf->id & 0xff); putenv (env);
		1368	}
		1369
		1370	void
		1371	connection::script_init_connect_env ()
		1372	{
		1373	vpn->script_init_env ();
		1374
		1375	char *env;
1052	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1376	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1377	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1053	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1378	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1054	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1379	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1055	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1380	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1056	}	1381	}
1057		1382
		1383	inline const char *
1058	const char *connection::script_node_up ()	1384	connection::script_node_up ()
1059	{	1385	{
1060	script_node ();	1386	script_init_connect_env ();
1061		1387
1062	putenv ("STATE=up");	1388	putenv ((char *)"STATE=up");
1063		1389
		1390	char *filename;
		1391	asprintf (&filename,
		1392	"%s/%s",
		1393	confbase,
1064	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1394	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1065	}
1066		1395
		1396	return filename;
		1397	}
		1398
		1399	inline const char *
		1400	connection::script_node_change ()
		1401	{
		1402	script_init_connect_env ();
		1403
		1404	putenv ((char *)"STATE=change");
		1405
		1406	char *filename;
		1407	asprintf (&filename,
		1408	"%s/%s",
		1409	confbase,
		1410	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1411
		1412	return filename;
		1413	}
		1414
		1415	inline const char *
1067	const char *connection::script_node_down ()	1416	connection::script_node_down ()
1068	{	1417	{
1069	script_node ();	1418	script_init_connect_env ();
1070		1419
1071	putenv ("STATE=down");	1420	putenv ((char *)"STATE=down");
1072		1421
1073	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1422	char *filename;
1074	}	1423	asprintf (&filename,
		1424	"%s/%s",
		1425	confbase,
		1426	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1075		1427
		1428	return filename;
		1429	}
		1430
1076	connection::connection(struct vpn *vpn_)	1431	connection::connection (struct vpn *vpn, conf_node *conf)
1077	: vpn(vpn_)	1432	: vpn(vpn), conf(conf),
1078	, rekey (this, &connection::rekey_cb)	1433	#if ENABLE_DNS
1079	, keepalive (this, &connection::keepalive_cb)	1434	dns (0),
		1435	#endif
		1436	data_queue(conf->max_ttl, conf->max_queue + 1),
		1437	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1438	{
		1439	rekey .set<connection, &connection::rekey_cb > (this);
		1440	keepalive .set<connection, &connection::keepalive_cb > (this);
1080	, establish_connection (this, &connection::establish_connection_cb)	1441	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1081	{	1442
		1443	last_establish_attempt = 0.;
1082	octx = ictx = 0;	1444	octx = ictx = 0;
1083	retry_cnt = 0;
1084		1445
1085	connectmode = conf_node::C_ALWAYS; // initial setting	1446	connectmode = conf->connectmode;
		1447
		1448	// queue a dummy packet to force an initial connection attempt
		1449	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1450	vpn_queue.put (new net_packet);
		1451
1086	reset_connection ();	1452	reset_connection ();
1087	}	1453	}
1088		1454
1089	connection::~connection ()	1455	connection::~connection ()
1090	{	1456	{
1091	shutdown ();	1457	shutdown ();
1092	}	1458	}
1093		1459
		1460	void
1094	void connection_init ()	1461	connection_init ()
1095	{	1462	{
1096	auth_rate_limiter.clear ();	1463	auth_rate_limiter.clear ();
1097	reset_rate_limiter.clear ();	1464	reset_rate_limiter.clear ();
1098	}	1465	}
1099		1466

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