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Comparing gvpe/src/connection.C (file contents):
Revision 1.53 by pcg, Sat Mar 26 03:16:24 2005 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) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <cassert>
25
26	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
27		37
28	#include <openssl/rand.h>	38	#include <openssl/rand.h>
29	#include <openssl/evp.h>	39	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
31	#include <openssl/err.h>	41	#include <openssl/err.h>
…		…
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 "PORN\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 (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
64	EVP_CIPHER_CTX_init (&cctx);	146	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	147	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	148	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	149	}
69		150
70	crypto_ctx::~crypto_ctx ()	151	crypto_ctx::~crypto_ctx ()
71	{	152	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	153	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	154	HMAC_CTX_cleanup (&hctx);
74	}	155	}
75		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
76	static void	184	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	185	auth_hash (const auth_data &auth, auth_mac &mac)
78	{	186	{
79	EVP_MD_CTX ctx;	187	HMAC_CTX ctx;
80		188
81	EVP_MD_CTX_init (&ctx);	189	HMAC_CTX_init (&ctx);
82	require (EVP_DigestInit (&ctx, RSA_HASH));	190	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));	191	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	192	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
86	EVP_MD_CTX_cleanup (&ctx);	193	HMAC_CTX_cleanup (&ctx);
87	}	194	}
88		195
89	struct rsa_entry {	196	void
90	tstamp expire;	197	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	198	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	199	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{	200	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	201	// request data
104	{	202	rand_fill (snd_auth.rsa);
105	memcpy (&chg, &i->chg, sizeof chg);	203	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		204	auth_hash (snd_auth, snd_auth_mac);
106		205
107	erase (i);	206	// eventual response data
108	return true;	207	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
109	}
110	}	208	}
111		209
112	if (cleaner.at < NOW)	210	// every use prolongs the expiry
113	cleaner.start (NOW + RSA_TTL);	211	auth_expire = ev_now () + AUTH_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	{ }
138
139	} rsa_cache;
140
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{
145	w.start (NOW + RSA_TTL);
146
147	for (iterator i = begin (); i != end (); )
148	if (i->expire <= NOW)
149	i = erase (i);
150	else
151	++i;
152	}
153	}	212	}
154		213
155	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
156		215
157	void pkt_queue::put (net_packet *p)	216	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		217	: max_ttl (max_ttl), max_queue (max_queue)
158	{	218	{
159	if (queue[i])	219	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		220
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;	221	i = 0;
187	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	225	}
189		226
190	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
191	{	228	{
192	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
193	delete queue[i];	232	delete [] queue;
194	}	233	}
195		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
196	struct net_rateinfo {	291	struct net_rateinfo
		292	{
197	u32 host;	293	u32 host;
198	double pcnt, diff;	294	double pcnt, diff;
199	tstamp last;	295	tstamp last;
200	};	296	};
201		297
…		…
211		307
212	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	309	bool can (u32 host);
214	};	310	};
215		311
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		313
		314	bool
218	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
219	{	316	{
220	iterator i;	317	iterator i;
221		318
222	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
223	if (i->host == host)	320	if (i->host == host)
224	break;	321	break;
225	else if (i->last < NOW - NRL_EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	323	i = erase (i);
227	else	324	else
228	i++;	325	i++;
229		326
230	if (i == end ())	327	if (i == end ())
…		…
232	net_rateinfo ri;	329	net_rateinfo ri;
233		330
234	ri.host = host;	331	ri.host = host;
235	ri.pcnt = 1.;	332	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	333	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	334	ri.last = ev_now ();
238		335
239	push_front (ri);	336	push_front (ri);
240		337
241	return true;	338	return true;
242	}	339	}
…		…
244	{	341	{
245	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
246	erase (i);	343	erase (i);
247		344
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		347
251	ri.last = NOW;	348	ri.last = ev_now ();
252		349
253	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
254		351
255	bool send = dif > NRL_CUTOFF;	352	bool send = dif > NRL_CUTOFF;
256		353
…		…
270		367
271	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
272		369
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
274		371
		372	void
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
276	{	374	{
277	unsigned int xlen;	375	unsigned int xlen;
278		376
279	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
280		378
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	379	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	380	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
283	len - sizeof (hmac_packet));	381	len - sizeof (hmac_packet)));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	382	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
285	}	383	}
286		384
287	void	385	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	386	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	387	{
…		…
298	hmac_gen (ctx);	396	hmac_gen (ctx);
299		397
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	399	}
302		400
		401	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	403	{
305	type = type_;	404	type = type_;
306		405
307	int src = THISNODE->id;	406	int src = THISNODE->id;
308		407
…		…
313		412
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		415
317	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
318	{	425	{
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;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	427	}
		428	};
330		429
331	void	430	void
332	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)
333	{	432	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
337		436
338	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
340		439
341	if (conn->features & ENABLE_COMPRESSION)	440	if (conn->features & FEATURE_COMPRESSION)
342	{	441	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		443
345	if (cl)	444	if (cl)
346	{	445	{
…		…
352	d[1] = cl;	451	d[1] = cl;
353	}	452	}
354	}	453	}
355	#endif	454	#endif
356		455
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	456	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		457
359	struct {	458	struct {
360	#if RAND_SIZE	459	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	460	u8 rnd[RAND_SIZE];
362	#endif	461	#endif
363	u32 seqno;	462	u32 seqno;
364	} datahdr;	463	} datahdr;
365		464
366	datahdr.seqno = ntohl (seqno);	465	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	466	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	467	require (RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE) >= 0);
369	#endif	468	#endif
370		469
371	require (EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	472	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	494	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
397	u8 *d;	496	u8 *d;
398	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
399		498
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		500
402	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
404		503
405	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	505	d = cdata;
407	else	506	else
408	#endif	507	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
410		509
411	/* 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
412	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	518	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	520	outl += outl2;
416		521
…		…
447	}	552	}
448	};	553	};
449		554
450	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
451	{	556	{
452	// actually, hmaclen cannot be checked because the hmac
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
458		560
459	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
460	bool chk_config () const;	562	bool chk_config () const;
461		563
462	static u8 get_features ()	564	static u8 get_features ()
…		…
466	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
467	#endif	569	#endif
468	#if ENABLE_ROHC	570	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
470	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
471	return f;	576	return f;
472	}	577	}
473	};	578	};
474		579
		580	void
475	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
476	{	582	{
477	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;
481	flags = 0;	586	flags = 0;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	587	features = get_features ();
484		588
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	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 ()));
488		592
489	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	594	set_hdr (type, dst);
491	}	595	}
492		596
		597	bool
493	bool config_packet::chk_config () const	598	config_packet::chk_config () const
494	{	599	{
495	if (prot_major != PROTOCOL_MAJOR)	600	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	601	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	602	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	603	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499	else if (hmaclen != HMACLENGTH)
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	else if (challengelen != sizeof (rsachallenge))
502	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
503	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
504	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	605	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
505	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
506	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
507	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	606	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
508	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	607	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		608	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		609	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
509	else	610	else
510	return true;	611	return true;
511		612
512	return false;	613	return false;
513	}	614	}
514		615
515	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
516	{	617	{
517	char magic[8];	618	char magic[8];
518	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
519	u8 protocols; // supported protocols (will be patched on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
520	u8 pad2, pad3;	621	u8 pad2, pad3;
521	rsaid id;	622	auth_encr encr;
522	rsaencrdata encr;
523		623
524	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
525	{	625	{
526	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
527	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
528	initiate = !!initiate_;	628	initiate = !!initiate_;
529	protocols = protocols_;	629	protocols = protocols_;
530		630
531	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
532	}	632	}
533	};	633	};
534		634
535	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
536	{	636	{
537	rsaid id;
538	u8 pad1, pad2, pad3;
539	u8 response_len; // encrypted length
540	rsaresponse response;	637	auth_response response;
541		638
542	auth_res_packet (int dst)	639	auth_res_packet (int dst)
543	{	640	{
544	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
545		642
…		…
579	};	676	};
580		677
581	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
582		679
583	void	680	void
584	connection::connection_established ()	681	connection::connection_established (const sockinfo &rsi)
585	{	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
586	if (ictx && octx)	707	if (ictx && octx)
587	{	708	{
588	connectmode = conf->connectmode;
589
590	// make sure rekeying timeouts are slightly asymmetric	709	// make sure rekeying timeouts are slightly asymmetric
591	rekey.start (NOW + ::conf.rekey	710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
592	+ (conf->id > THISNODE->id ? 10 : 0));	711	rekey.start (rekey_interval, rekey_interval);
		712
593	keepalive.start (NOW + ::conf.keepalive);	713	keepalive.start (::conf.keepalive);
594		714
595	// send queued packets	715	// send queued packets
596	if (ictx && octx)	716	if (ictx && octx)
597	{	717	{
598	while (tap_packet *p = (tap_packet *)data_queue.get ())	718	while (tap_packet *p = (tap_packet *)data_queue.get ())
599	{	719	{
600	send_data_packet (p);	720	if (p->len) send_data_packet (p);
601	delete p;	721	delete p;
602	}	722	}
603		723
604	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	724	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
605	{	725	{
606	send_vpn_packet (p, si, IPTOS_RELIABILITY);	726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
607	delete p;	727	delete p;
608	}	728	}
609	}	729	}
		730
		731	vpn->connection_established (this);
610	}	732	}
		733	#if 0
611	else	734	else
612	{	735	{
613	retry_cnt = 0;	736	retry_cnt = 0;
614	establish_connection.start (NOW + 5);	737	establish_connection.start (5);
615	keepalive.stop ();	738	keepalive.stop ();
616	rekey.stop ();	739	rekey.stop ();
617	}	740	}
		741	#endif
618	}	742	}
619		743
620	void	744	void
621	connection::reset_si ()	745	connection::reset_si ()
622	{	746	{
		747	if (vpn->can_direct (THISNODE, conf))
623	protocol = best_protocol (THISNODE->protocols & conf->protocols);	748	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
624		749	else
625	// mask out protocols we cannot establish	750	{
626	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	751	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
627	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	752	protocol = 0;
628	if (!conf->dns_port) protocol &= ~PROT_DNSv4;	753	}
629		754
630	si.set (conf, protocol);	755	si.set (conf, protocol);
		756
		757	is_direct = si.valid ();
631	}	758	}
632		759
633	// ensure sockinfo is valid, forward if necessary	760	// ensure sockinfo is valid, forward if necessary
634	const sockinfo &	761	const sockinfo &
635	connection::forward_si (const sockinfo &si) const	762	connection::forward_si (const sockinfo &si) const
636	{	763	{
637	if (!si.valid ())	764	if (!si.valid ())
638	{	765	{
639	connection *r = vpn->find_router ();	766	connection *r = vpn->find_router_for (this);
640		767
641	if (r)	768	if (r)
642	{	769	{
643	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	770	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
644	conf->nodename, r->conf->nodename, (const char *)r->si);	771	conf->nodename, r->conf->nodename);
645	return r->si;	772	return r->si;
646	}	773	}
647	else	774	else
648	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	775	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
649	conf->nodename);	776	conf->nodename);
650	}	777	}
651		778
652	return si;	779	return si;
653	}	780	}
…		…
663	connection::send_ping (const sockinfo &si, u8 pong)	790	connection::send_ping (const sockinfo &si, u8 pong)
664	{	791	{
665	ping_packet *pkt = new ping_packet;	792	ping_packet *pkt = new ping_packet;
666		793
667	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	794	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		795
		796	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
668	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	797	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
669		798
670	delete pkt;	799	delete pkt;
671	}	800	}
672		801
…		…
687	void	816	void
688	connection::send_auth_request (const sockinfo &si, bool initiate)	817	connection::send_auth_request (const sockinfo &si, bool initiate)
689	{	818	{
690	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	819	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
691		820
692	rsachallenge chg;	821	generate_auth_data ();
693	rsa_cache.gen (pkt->id, chg);
694	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	822	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
695		823
696	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	824	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
697
698	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
699		826
700	delete pkt;	827	delete pkt;
701	}	828	}
702		829
703	void	830	void
704	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	831	connection::send_auth_response (const sockinfo &si)
705	{	832	{
706	auth_res_packet *pkt = new auth_res_packet (conf->id);	833	auth_res_packet *pkt = new auth_res_packet (conf->id);
707		834
708	pkt->id = id;	835	auth_hash (rcv_auth, pkt->response.mac);
		836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
709		837
710	rsa_hash (id, chg, pkt->response);
711
712	pkt->hmac_set (octx);
713
714	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	838	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
715
716	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	839	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
717		840
718	delete pkt;	841	delete pkt;
719	}	842	}
720		843
721	void	844	void
722	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	845	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
723	{	846	{
724	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	847	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
725	conf->id, rid, (const char *)rsi);	848	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		849	conf->protocols);
726		850
727	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	851	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
728		852
729	r->hmac_set (octx);	853	r->hmac_set (octx);
730	send_vpn_packet (r, si);	854	send_vpn_packet (r, si);
731		855
732	delete r;	856	delete r;
733	}	857	}
734		858
735	void	859	inline void
736	connection::establish_connection_cb (time_watcher &w)	860	connection::establish_connection_cb (ev::timer &w, int revents)
737	{	861	{
738	if (!ictx	862	if (!(ictx && octx)
739	&& conf != THISNODE	863	&& conf != THISNODE
740	&& connectmode != conf_node::C_NEVER	864	&& connectmode != conf_node::C_NEVER
741	&& connectmode != conf_node::C_DISABLED	865	&& connectmode != conf_node::C_DISABLED
742	&& NOW > w.at)	866	&& !w.is_active ())
743	{	867	{
744	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	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	}
745		875
746	double retry_int = double (retry_cnt & 3	876	last_establish_attempt = ev_now ();
		877
		878	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
747	? (retry_cnt & 3) + 1	879	? (retry_cnt & 3) + 1
748	: 1 << (retry_cnt >> 2));	880	: 1 << (retry_cnt >> 2));
749		881
750	reset_si ();	882	reset_si ();
751		883
752	bool slow = si.prot & PROT_SLOW;	884	bool slow = si.prot & PROT_SLOW;
753		885
754	if (si.prot && !si.host)	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);
755	vpn->send_connect_request (conf->id);	890	vpn->send_connect_request (this);
		891	}
756	else	892	else
757	{	893	{
		894	if (si.valid ())
		895	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		896	conf->nodename, (const char *)si);
		897
758	const sockinfo &dsi = forward_si (si);	898	const sockinfo &dsi = forward_si (si);
759		899
760	slow = slow || (dsi.prot & PROT_SLOW);	900	slow = slow || (dsi.prot & PROT_SLOW);
761		901
762	if (dsi.valid () && auth_rate_limiter.can (dsi))	902	if (dsi.valid () && auth_rate_limiter.can (dsi))
…		…
766	else	906	else
767	send_ping (dsi, 0);	907	send_ping (dsi, 0);
768	}	908	}
769	}	909	}
770		910
771	retry_int *= slow ? 8. : 0.7;	911	retry_int *= slow ? 8. : 0.9;
772		912
773	if (retry_int < conf->max_retry)	913	if (retry_int < conf->max_retry)
774	retry_cnt++;	914	retry_cnt++;
775	else	915	else
776	retry_int = conf->max_retry;	916	retry_int = conf->max_retry;
777		917
778	w.start (NOW + retry_int);	918	w.start (retry_int);
779	}	919	}
780	}	920	}
781		921
782	void	922	void
783	connection::reset_connection ()	923	connection::reset_connection ()
…		…
786	{	926	{
787	slog (L_INFO, _("%s(%s): connection lost"),	927	slog (L_INFO, _("%s(%s): connection lost"),
788	conf->nodename, (const char *)si);	928	conf->nodename, (const char *)si);
789		929
790	if (::conf.script_node_down)	930	if (::conf.script_node_down)
791	if (!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);
792	slog (L_WARN, _("node-down command execution failed, continuing."));	934	run_script_queued (cb, _("node-down command execution failed, continuing."));
		935	}
793	}	936	}
794		937
795	delete ictx; ictx = 0;	938	delete ictx; ictx = 0;
796	delete octx; octx = 0;	939	delete octx; octx = 0;
797	#if ENABLE_DNS
798	dnsv4_reset_connection ();
799	#endif
800		940
801	si.host = 0;	941	si.host = 0;
802		942
		943	have_snd_auth = false;
		944	have_rcv_auth = false;
		945	auth_expire = 0.;
		946
803	last_activity = 0;	947	last_activity = 0.;
		948	//last_si_change = 0.;
804	retry_cnt = 0;	949	retry_cnt = 0;
805		950
806	rekey.stop ();	951	rekey.stop ();
807	keepalive.stop ();	952	keepalive.stop ();
808	establish_connection.stop ();	953	establish_connection.stop ();
…		…
815	send_reset (si);	960	send_reset (si);
816		961
817	reset_connection ();	962	reset_connection ();
818	}	963	}
819		964
820	void	965	// poor-man's rekeying
821	connection::rekey_cb (time_watcher &w)	966	inline void
		967	connection::rekey_cb (ev::timer &w, int revents)
822	{	968	{
823	reset_connection ();	969	reset_connection ();
824	establish_connection ();	970	establish_connection ();
825	}	971	}
826		972
…		…
842	if (oseqno > MAX_SEQNO)	988	if (oseqno > MAX_SEQNO)
843	rekey ();	989	rekey ();
844	}	990	}
845		991
846	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
847	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1003	connection::inject_data_packet (tap_packet *pkt)
848	{	1004	{
849	if (ictx && octx)	1005	if (ictx && octx)
850	send_data_packet (pkt);	1006	send_data_packet (pkt);
851	else	1007	else
852	{	1008	{
853	if (!broadcast)//DDDD
854	data_queue.put (new tap_packet (*pkt));	1009	data_queue.put (new tap_packet (*pkt));
855		1010	post_inject_queue ();
856	establish_connection ();
857	}	1011	}
858	}	1012	}
859		1013
		1014	void
860	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1015	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
861	{	1016	{
862	if (ictx && octx)	1017	if (ictx && octx)
863	send_vpn_packet (pkt, si, tos);	1018	send_vpn_packet (pkt, si, tos);
864	else	1019	else
865	{	1020	{
866	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1021	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
867		1022	post_inject_queue ();
868	establish_connection ();
869	}	1023	}
870	}	1024	}
871		1025
872	void	1026	void
873	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1027	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
874	{	1028	{
875	last_activity = NOW;	1029	last_activity = ev_now ();
876		1030
877	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.",
878	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;
879		1036
880	switch (pkt->typ ())	1037	switch (pkt->typ ())
881	{	1038	{
882	case vpn_packet::PT_PING:	1039	case vpn_packet::PT_PING:
		1040	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1041
883	// we send pings instead of auth packets after some retries,	1042	// we send pings instead of auth packets after some retries,
884	// so reset the retry counter and establish a connection	1043	// so reset the retry counter and establish a connection
885	// when we receive a ping.	1044	// when we receive a ping.
886	if (!ictx)	1045	if (!ictx)
887	{	1046	{
888	if (auth_rate_limiter.can (rsi))	1047	if (auth_rate_limiter.can (rsi))
889	send_auth_request (rsi, true);	1048	send_auth_request (rsi, true);
890	}	1049	}
891	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.
892	send_ping (rsi, 1); // pong	1053	send_ping (rsi, 1); // pong
893		1054
894	break;	1055	break;
895		1056
896	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 ();
897	break;	1063	break;
898		1064
899	case vpn_packet::PT_RESET:	1065	case vpn_packet::PT_RESET:
900	{	1066	{
901	reset_connection ();	1067	reset_connection ();
902		1068
903	config_packet *p = (config_packet *) pkt;	1069	config_packet *p = (config_packet *) pkt;
904		1070
905	if (!p->chk_config ())	1071	if (!p->chk_config ())
906	{	1072	{
907	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1073	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
908	conf->nodename, (const char *)rsi);	1074	conf->nodename, (const char *)rsi);
909	connectmode = conf_node::C_DISABLED;	1075	connectmode = conf_node::C_DISABLED;
910	}	1076	}
911	else if (connectmode == conf_node::C_ALWAYS)	1077	else if (connectmode == conf_node::C_ALWAYS)
912	establish_connection ();	1078	establish_connection ();
…		…
914	break;	1080	break;
915		1081
916	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
917	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
918	{	1084	{
919	auth_req_packet *p = (auth_req_packet *) pkt;	1085	auth_req_packet *p = (auth_req_packet *)pkt;
920		1086
921	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);
922		1090
923	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
924	{	1092	{
925	if (p->prot_minor != PROTOCOL_MINOR)	1093	if (p->prot_minor != PROTOCOL_MINOR)
926	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."),
927	conf->nodename, (const char *)rsi,	1095	conf->nodename, (const char *)rsi,
928	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1096	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
929		1097
930	if (p->initiate)	1098	if (p->initiate)
931	send_auth_request (rsi, false);	1099	send_auth_request (rsi, false);
932		1100
933	rsachallenge k;	1101	auth_data auth;
934		1102
935	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1103	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
936	{	1104	{
937	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1105	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
938	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1106	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
939	break;
940	}	1107	}
941	else	1108	else
942	{	1109	{
943	delete octx;	1110	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
944		1111
945	octx = new crypto_ctx (k, 1);	1112	rcv_auth = auth;
946	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1113	have_rcv_auth = true;
947		1114
		1115	send_auth_response (rsi);
		1116
		1117	if (chg)
		1118	{
948	conf->protocols = p->protocols;	1119	conf->protocols = p->protocols;
949	features = p->features & config_packet::get_features ();	1120	features = p->features & config_packet::get_features ();
950		1121
951	send_auth_response (rsi, p->id, k);
952
953	connection_established ();	1122	connection_established (rsi);
954
955	break;	1123	}
956	}	1124	}
		1125
		1126	break;
957	}	1127	}
958	else	1128	else
959	slog (L_WARN, _("%s(%s): protocol mismatch"),	1129	slog (L_WARN, _("%s(%s): protocol mismatch."),
960	conf->nodename, (const char *)rsi);	1130	conf->nodename, (const char *)rsi);
961		1131
962	send_reset (rsi);	1132	send_reset (rsi);
963	}	1133	}
964		1134
965	break;	1135	break;
966		1136
967	case vpn_packet::PT_AUTH_RES:	1137	case vpn_packet::PT_AUTH_RES:
968	{	1138	{
969	auth_res_packet *p = (auth_res_packet *) pkt;	1139	auth_res_packet *p = (auth_res_packet *)pkt;
970		1140
971	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1141	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
972		1142
973	if (p->chk_config ())	1143	if (p->chk_config ())
974	{	1144	{
975	if (p->prot_minor != PROTOCOL_MINOR)	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
976	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
977	conf->nodename, (const char *)rsi,
978	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
979
980	rsachallenge chg;
981
982	if (!rsa_cache.find (p->id, chg))
983	{	1146	{
984	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
985	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
986	break;
987	}	1149	}
988	else	1150	else if (!have_snd_auth)
989	{	1151	{
990	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1152	if (p->prot_minor != PROTOCOL_MINOR)
991		1153	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
992	if (!p->hmac_chk (cctx))
993	{
994	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
995	"could be an attack, or just corruption or a synchronization error"),
996	conf->nodename, (const char *)rsi);	1154	conf->nodename, (const char *)rsi,
997	break;	1155	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
998	}
999	else
1000	{
1001	rsaresponse h;
1002		1156
1003	rsa_hash (p->id, chg, h);
1004
1005	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1006	{
1007	prot_minor = p->prot_minor;	1157	prot_minor = p->prot_minor;
		1158	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
1008		1159
1009	delete ictx; ictx = cctx;	1160	have_snd_auth = true;
1010
1011	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1012
1013	si = rsi;
1014	protocol = rsi.prot;
1015
1016	connection_established ();	1161	connection_established (rsi);
1017
1018	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1019	conf->nodename, (const char *)rsi,
1020	p->prot_major, p->prot_minor);
1021
1022	if (::conf.script_node_up)
1023	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1024	slog (L_WARN, _("node-up command execution failed, continuing."));
1025
1026	break;
1027	}
1028	else
1029	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1030	conf->nodename, (const char *)rsi);
1031	}
1032
1033	delete cctx;
1034	}	1162	}
		1163
		1164	break;
1035	}	1165	}
1036	}	1166	}
1037		1167
1038	send_reset (rsi);	1168	send_reset (rsi);
1039	break;	1169	break;
…		…
1050	{	1180	{
1051	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1052		1182
1053	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
1054	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1055	"could be an attack, or just corruption or a synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1056	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
1057	else	1187	else
1058	{	1188	{
1059	u32 seqno;	1189	u32 seqno;
1060	tap_packet *d = p->unpack (this, seqno);	1190	tap_packet *d = p->unpack (this, seqno);
		1191	int seqclass = iseqno.seqno_classify (seqno);
1061		1192
1062	if (iseqno.recv_ok (seqno))	1193	if (seqclass == 0) // ok
1063	{	1194	{
1064	vpn->tap->send (d);	1195	vpn->tap->send (d);
1065		1196
1066	if (si != rsi)	1197	if (si != rsi)
1067	{	1198	{
1068	// fast re-sync on connection changes, useful especially for tcp/ip	1199	// fast re-sync on source address changes, useful especially for tcp/ip
		1200	//if (last_si_change < ev_now () + 5.)
1069	si = rsi;	1201	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1202	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	conf->nodename, (const char *)si, (const char *)rsi);	1203	conf->nodename, (const char *)si, (const char *)rsi);
		1204
		1205	si = rsi;
		1206
		1207	if (::conf.script_node_change)
		1208	{
		1209	run_script_cb *cb = new run_script_cb;
		1210	cb->set<connection, &connection::script_node_change> (this);
		1211	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1212	}
		1213
		1214	// }
		1215	//else
		1216	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1217	// conf->nodename, (const char *)si, (const char *)rsi);
1073	}	1218	}
		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);
1074	}	1231	}
1075		1232
1076	delete d;	1233	delete d;
1077	break;	1234	break;
1078	}	1235	}
…		…
1082	break;	1239	break;
1083		1240
1084	case vpn_packet::PT_CONNECT_REQ:	1241	case vpn_packet::PT_CONNECT_REQ:
1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1242	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1086	{	1243	{
1087	connect_req_packet *p = (connect_req_packet *) pkt;	1244	connect_req_packet *p = (connect_req_packet *)pkt;
1088		1245
1089	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 ())
1090	connection *c = vpn->conns[p->id - 1];
1091	conf->protocols = p->protocols;
1092
1093	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1094	conf->id, p->id, c->ictx && c->octx);
1095
1096	if (c->ictx && c->octx)
1097	{	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	{
1098	// send connect_info packets to both sides, in case one is	1258	// send connect_info packets to both sides, in case one is
1099	// behind a nat firewall (or both ;)	1259	// behind a nat firewall (or both ;)
1100	c->send_connect_info (conf->id, si, conf->protocols);	1260	c->send_connect_info (conf->id, si, conf->protocols);
1101	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 ();
1102	}	1265	}
1103	else	1266	else
1104	c->establish_connection ();	1267	slog (L_WARN,
		1268	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1269	p->id);
1105	}	1270	}
1106		1271
1107	break;	1272	break;
1108		1273
1109	case vpn_packet::PT_CONNECT_INFO:	1274	case vpn_packet::PT_CONNECT_INFO:
1110	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1275	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1111	{	1276	{
1112	connect_info_packet *p = (connect_info_packet *)pkt;	1277	connect_info_packet *p = (connect_info_packet *)pkt;
1113		1278
1114	if (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 ())
1115	{	1280	{
1116	connection *c = vpn->conns[p->id - 1];	1281	connection *c = vpn->conns[p->id - 1];
1117		1282
1118	c->conf->protocols = p->protocols;	1283	c->conf->protocols = p->protocols;
1119	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1284	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1120	p->si.upgrade_protocol (protocol, c->conf);	1285	p->si.upgrade_protocol (protocol, c->conf);
1121		1286
1122	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1287	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1123	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1288	conf->nodename,
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si,
		1291	p->protocols,
		1292	protocol,
		1293	p->si.supported_protocols (c->conf),
		1294	!c->ictx && !c->octx);
1124		1295
1125	const sockinfo &dsi = forward_si (p->si);	1296	const sockinfo &dsi = forward_si (p->si);
1126		1297
1127	if (dsi.valid ())	1298	if (dsi.valid ())
1128	c->send_auth_request (dsi, true);	1299	c->send_auth_request (dsi, true);
		1300	else
		1301	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si);
1129	}	1304	}
		1305	else
		1306	slog (L_WARN,
		1307	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1308	p->id);
1130	}	1309	}
1131		1310
1132	break;	1311	break;
1133		1312
1134	default:	1313	default:
1135	send_reset (rsi);	1314	send_reset (rsi);
1136	break;	1315	break;
1137	}	1316	}
1138	}	1317	}
1139		1318
1140	void connection::keepalive_cb (time_watcher &w)	1319	inline void
		1320	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1321	{
1142	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)
1143	{	1327	{
1144	reset_connection ();	1328	reset_connection ();
1145	establish_connection ();	1329	establish_connection ();
1146	}	1330	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.start (last_activity + ::conf.keepalive);
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1331	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1332	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1333	{
		1334	w.start (3);
1152	send_ping (si);	1335	send_ping (si);
1153	w.start (NOW + 5);
1154	}	1336	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1337	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1338	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1339	// should delete octx, though, or something like that ;)
1158	w.start (last_activity + ::conf.keepalive + 10);	1340	w.start (when + 10);
1159	else	1341	else
1160	reset_connection ();	1342	reset_connection ();
1161	}	1343	}
1162		1344
		1345	void
1163	void connection::send_connect_request (int id)	1346	connection::send_connect_request (int id)
1164	{	1347	{
1165	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);
1166		1349
1167	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);
1168	p->hmac_set (octx);	1353	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1354	send_vpn_packet (p, si);
1170		1355
1171	delete p;	1356	delete p;
1172	}	1357	}
1173		1358
		1359	void
1174	void connection::script_init_env (const char *ext)	1360	connection::script_init_env (const char *ext)
1175	{	1361	{
1176	char *env;	1362	char *env;
1177	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1363	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1178	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1364	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1179	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1365	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1180	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1366	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1181	conf->id & 0xff); putenv (env);	1367	conf->id & 0xff); putenv (env);
1182	}	1368	}
1183		1369
		1370	void
1184	void connection::script_init_connect_env ()	1371	connection::script_init_connect_env ()
1185	{	1372	{
1186	vpn->script_init_env ();	1373	vpn->script_init_env ();
1187		1374
1188	char *env;	1375	char *env;
1189	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);
1190	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1378	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1191	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1379	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1192	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1380	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1193	}	1381	}
1194		1382
		1383	inline const char *
1195	const char *connection::script_node_up ()	1384	connection::script_node_up ()
1196	{	1385	{
1197	script_init_connect_env ();	1386	script_init_connect_env ();
1198		1387
1199	putenv ("STATE=up");	1388	putenv ((char *)"STATE=up");
1200		1389
1201	char *filename;	1390	char *filename;
1202	asprintf (&filename,	1391	asprintf (&filename,
1203	"%s/%s",	1392	"%s/%s",
1204	confbase,	1393	confbase,
1205	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1394	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1206	}
1207		1395
1208	const char *connection::script_node_down ()	1396	return filename;
		1397	}
		1398
		1399	inline const char *
		1400	connection::script_node_change ()
1209	{	1401	{
1210	script_init_connect_env ();	1402	script_init_connect_env ();
1211		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 *
		1416	connection::script_node_down ()
		1417	{
		1418	script_init_connect_env ();
		1419
1212	putenv ("STATE=down");	1420	putenv ((char *)"STATE=down");
1213		1421
1214	char *filename;	1422	char *filename;
1215	asprintf (&filename,	1423	asprintf (&filename,
1216	"%s/%s",	1424	"%s/%s",
1217	confbase,	1425	confbase,
1218	::conf.script_node_down ? ::conf.script_node_down : "node-down");	1426	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1427
		1428	return filename;
1219	}	1429	}
1220		1430
1221	connection::connection (struct vpn *vpn, conf_node *conf)	1431	connection::connection (struct vpn *vpn, conf_node *conf)
1222	: vpn(vpn), conf(conf)	1432	: 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	1433	#if ENABLE_DNS
1227	, dns (0)	1434	dns (0),
1228	#endif	1435	#endif
		1436	data_queue(conf->max_ttl, conf->max_queue + 1),
		1437	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1229	{	1438	{
		1439	rekey .set<connection, &connection::rekey_cb > (this);
		1440	keepalive .set<connection, &connection::keepalive_cb > (this);
		1441	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1442
		1443	last_establish_attempt = 0.;
1230	octx = ictx = 0;	1444	octx = ictx = 0;
1231	retry_cnt = 0;
1232		1445
1233	if (!conf->protocols) // make sure some protocol is enabled	1446	connectmode = conf->connectmode;
1234	conf->protocols = PROT_UDPv4;
1235		1447
1236	connectmode = conf_node::C_ALWAYS; // initial setting	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
1237	reset_connection ();	1452	reset_connection ();
1238	}	1453	}
1239		1454
1240	connection::~connection ()	1455	connection::~connection ()
1241	{	1456	{
1242	shutdown ();	1457	shutdown ();
1243	}	1458	}
1244		1459
		1460	void
1245	void connection_init ()	1461	connection_init ()
1246	{	1462	{
1247	auth_rate_limiter.clear ();	1463	auth_rate_limiter.clear ();
1248	reset_rate_limiter.clear ();	1464	reset_rate_limiter.clear ();
1249	}	1465	}
1250		1466

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