[ViewVC] Diff of: cvs/gvpe/src/connection.C

Comparing gvpe/src/connection.C (file contents):
Revision 1.49 by pcg, Sat Mar 12 18:10:40 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>
32
33	#include "gettext.h"
34		42
35	#include "conf.h"	43	#include "conf.h"
36	#include "slog.h"	44	#include "slog.h"
37	#include "device.h"	45	#include "device.h"
38	#include "vpn.h"	46	#include "vpn.h"
39	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
40		49
41	#include "netcompat.h"	50	#include "netcompat.h"
42		51
43	#if !HAVE_RAND_PSEUDO_BYTES
44	# define RAND_pseudo_bytes RAND_bytes
45	#endif
46
47	#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
48		54
49	#define ULTRA_FAST 1	55	#define ULTRA_FAST 1
50	#define HLOG 15	56	#define HLOG 15
51	#include "lzf/lzf.h"	57	#include "lzf/lzf.h"
52	#include "lzf/lzf_c.c"	58	#include "lzf/lzf_c.c"
53	#include "lzf/lzf_d.c"	59	#include "lzf/lzf_d.c"
54		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
55	struct crypto_ctx	105	struct crypto_ctx
56	{	106	{
57	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
58	HMAC_CTX hctx;	108	HMAC_CTX hctx;
59		109
60	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);
61	~crypto_ctx ();	111	~crypto_ctx ();
62	};	112	};
63		113
64	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)
65	{	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
66	EVP_CIPHER_CTX_init (&cctx);	146	EVP_CIPHER_CTX_init (&cctx);
67	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));
68	HMAC_CTX_init (&hctx);	148	}
69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
70	}	149	}
71		150
72	crypto_ctx::~crypto_ctx ()	151	crypto_ctx::~crypto_ctx ()
73	{	152	{
74	require (EVP_CIPHER_CTX_cleanup (&cctx));	153	require (EVP_CIPHER_CTX_cleanup (&cctx));
75	HMAC_CTX_cleanup (&hctx);	154	HMAC_CTX_cleanup (&hctx);
76	}	155	}
77		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
78	static void	184	static void
79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	185	auth_hash (const auth_data &auth, auth_mac &mac)
80	{	186	{
81	EVP_MD_CTX ctx;	187	HMAC_CTX ctx;
82		188
83	EVP_MD_CTX_init (&ctx);	189	HMAC_CTX_init (&ctx);
84	require (EVP_DigestInit (&ctx, RSA_HASH));	190	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));	191	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	192	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
88	EVP_MD_CTX_cleanup (&ctx);	193	HMAC_CTX_cleanup (&ctx);
89	}	194	}
90		195
91	struct rsa_entry {	196	void
92	tstamp expire;	197	connection::generate_auth_data ()
93	rsaid id;
94	rsachallenge chg;
95	};
96
97	struct rsa_cache : list<rsa_entry>
98	{	198	{
99	void cleaner_cb (time_watcher &w); time_watcher cleaner;	199	if (auth_expire < ev_now ())
100
101	bool find (const rsaid &id, rsachallenge &chg)
102	{
103	for (iterator i = begin (); i != end (); ++i)
104	{
105	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
106	{
107	memcpy (&chg, &i->chg, sizeof chg);
108
109	erase (i);
110	return true;
111	}
112	}
113
114	if (cleaner.at < NOW)
115	cleaner.start (NOW + RSA_TTL);
116
117	return false;
118	}
119
120	void gen (rsaid &id, rsachallenge &chg)
121	{
122	rsa_entry e;
123
124	RAND_bytes ((unsigned char *)&id, sizeof id);
125	RAND_bytes ((unsigned char *)&chg, sizeof chg);
126
127	e.expire = NOW + RSA_TTL;
128	e.id = id;
129	memcpy (&e.chg, &chg, sizeof chg);
130
131	push_back (e);
132
133	if (cleaner.at < NOW)
134	cleaner.start (NOW + RSA_TTL);
135	}
136
137	rsa_cache ()
138	: cleaner (this, &rsa_cache::cleaner_cb)
139	{ }	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);
140		205
141	} rsa_cache;	206	// eventual response data
142		207	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
143	void rsa_cache::cleaner_cb (time_watcher &w)
144	{
145	if (!empty ())
146	{	208	}
147	w.start (NOW + RSA_TTL);
148		209
149	for (iterator i = begin (); i != end (); )	210	// every use prolongs the expiry
150	if (i->expire <= NOW)	211	auth_expire = ev_now () + AUTH_TTL;
151	i = erase (i);
152	else
153	++i;
154	}
155	}	212	}
156		213
157	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
158		215
159	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)
160	{	218	{
161	if (queue[i])	219	queue = new pkt [max_queue];
162	{
163	delete queue[i];
164	j = (j + 1) % QUEUEDEPTH;
165	}
166		220
167	queue[i] = p;
168
169	i = (i + 1) % QUEUEDEPTH;
170	}
171
172	net_packet *pkt_queue::get ()
173	{
174	net_packet *p = queue[j];
175
176	if (p)
177	{
178	queue[j] = 0;
179	j = (j + 1) % QUEUEDEPTH;
180	}
181
182	return p;
183	}
184
185	pkt_queue::pkt_queue ()
186	{
187	memset (queue, 0, sizeof (queue));
188	i = 0;	221	i = 0;
189	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190	}	225	}
191		226
192	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
193	{	228	{
194	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
195	delete queue[i];	232	delete [] queue;
196	}	233	}
197		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
198	struct net_rateinfo {	291	struct net_rateinfo
		292	{
199	u32 host;	293	u32 host;
200	double pcnt, diff;	294	double pcnt, diff;
201	tstamp last;	295	tstamp last;
202	};	296	};
203		297
213		307
214	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	309	bool can (u32 host);
216	};	310	};
217		311
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		313
		314	bool
220	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
221	{	316	{
222	iterator i;	317	iterator i;
223		318
224	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
225	if (i->host == host)	320	if (i->host == host)
226	break;	321	break;
227	else if (i->last < NOW - NRL_EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
228	i = erase (i);	323	i = erase (i);
229	else	324	else
230	i++;	325	i++;
231		326
232	if (i == end ())	327	if (i == end ())
…		…
234	net_rateinfo ri;	329	net_rateinfo ri;
235		330
236	ri.host = host;	331	ri.host = host;
237	ri.pcnt = 1.;	332	ri.pcnt = 1.;
238	ri.diff = NRL_MAXDIF;	333	ri.diff = NRL_MAXDIF;
239	ri.last = NOW;	334	ri.last = ev_now ();
240		335
241	push_front (ri);	336	push_front (ri);
242		337
243	return true;	338	return true;
244	}	339	}
…		…
246	{	341	{
247	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
248	erase (i);	343	erase (i);
249		344
250	ri.pcnt = ri.pcnt * NRL_ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252		347
253	ri.last = NOW;	348	ri.last = ev_now ();
254		349
255	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
256		351
257	bool send = dif > NRL_CUTOFF;	352	bool send = dif > NRL_CUTOFF;
258		353
…		…
272		367
273	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
274		369
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
276		371
		372	void
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
278	{	374	{
279	unsigned int xlen;	375	unsigned int xlen;
280		376
281	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
282		378
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	379	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	380	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
285	len - sizeof (hmac_packet));	381	len - sizeof (hmac_packet)));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	382	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
287	}	383	}
288		384
289	void	385	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	386	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	387	{
…		…
300	hmac_gen (ctx);	396	hmac_gen (ctx);
301		397
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
303	}	399	}
304		400
		401	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	403	{
307	type = type_;	404	type = type_;
308		405
309	int src = THISNODE->id;	406	int src = THISNODE->id;
310		407
…		…
315		412
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		415
319	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
320	{	425	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
322
323	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
324	tap_packet unpack (connection conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	427	}
		428	};
332		429
333	void	430	void
334	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)
335	{	432	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
339		436
340	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
342		439
343	if (conn->features & ENABLE_COMPRESSION)	440	if (conn->features & FEATURE_COMPRESSION)
344	{	441	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		443
347	if (cl)	444	if (cl)
348	{	445	{
…		…
354	d[1] = cl;	451	d[1] = cl;
355	}	452	}
356	}	453	}
357	#endif	454	#endif
358		455
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	456	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
360		457
361	struct {	458	struct {
362	#if RAND_SIZE	459	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];	460	u8 rnd[RAND_SIZE];
364	#endif	461	#endif
365	u32 seqno;	462	u32 seqno;
366	} datahdr;	463	} datahdr;
367		464
368	datahdr.seqno = ntohl (seqno);	465	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE	466	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	467	require (RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE) >= 0);
371	#endif	468	#endif
372		469
373	require (EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	472	(unsigned char *) &datahdr, DATAHDR));
…		…
397	int outl = 0, outl2;	494	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
399	u8 *d;	496	u8 *d;
400	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
401		498
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
403		500
404	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
406		503
407	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	505	d = cdata;
409	else	506	else
410	#endif	507	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
412		509
413	/* 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
414	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	518	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	520	outl += outl2;
418		521
…		…
449	}	552	}
450	};	553	};
451		554
452	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
453	{	556	{
454	// actually, hmaclen cannot be checked because the hmac
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
460		560
461	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
462	bool chk_config () const;	562	bool chk_config () const;
463		563
464	static u8 get_features ()	564	static u8 get_features ()
…		…
468	f \|= FEATURE_COMPRESSION;	568	f \|= FEATURE_COMPRESSION;
469	#endif	569	#endif
470	#if ENABLE_ROHC	570	#if ENABLE_ROHC
471	f \|= FEATURE_ROHC;	571	f \|= FEATURE_ROHC;
472	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f \|= FEATURE_BRIDGING;
		575	#endif
473	return f;	576	return f;
474	}	577	}
475	};	578	};
476		579
		580	void
477	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
478	{	582	{
479	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
480	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
481	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
482	hmaclen = HMACLENGTH;
483	flags = 0;	586	flags = 0;
484	challengelen = sizeof (rsachallenge);
485	features = get_features ();	587	features = get_features ();
486		588
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	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 ()));
490		592
491	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	594	set_hdr (type, dst);
493	}	595	}
494		596
		597	bool
495	bool config_packet::chk_config () const	598	config_packet::chk_config () const
496	{	599	{
497	if (prot_major != PROTOCOL_MAJOR)	600	if (prot_major != PROTOCOL_MAJOR)
498	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);
499	else if (randsize != RAND_SIZE)	602	else if (randsize != RAND_SIZE)
500	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);
501	else if (hmaclen != HMACLENGTH)
502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503	else if (challengelen != sizeof (rsachallenge))
504	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
505	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
506	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 ()));
507	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
508	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
509	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	606	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
510	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 ()));
511	else	610	else
512	return true;	611	return true;
513		612
514	return false;	613	return false;
515	}	614	}
516		615
517	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
518	{	617	{
519	char magic[8];	618	char magic[8];
520	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
521	u8 protocols; // supported protocols (will be patched on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
522	u8 pad2, pad3;	621	u8 pad2, pad3;
523	rsaid id;	622	auth_encr encr;
524	rsaencrdata encr;
525		623
526	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
527	{	625	{
528	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
529	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
530	initiate = !!initiate_;	628	initiate = !!initiate_;
531	protocols = protocols_;	629	protocols = protocols_;
532		630
533	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
534	}	632	}
535	};	633	};
536		634
537	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
538	{	636	{
539	rsaid id;
540	u8 pad1, pad2, pad3;
541	u8 response_len; // encrypted length
542	rsaresponse response;	637	auth_response response;
543		638
544	auth_res_packet (int dst)	639	auth_res_packet (int dst)
545	{	640	{
546	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
547		642
…		…
581	};	676	};
582		677
583	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
584		679
585	void	680	void
586	connection::connection_established ()	681	connection::connection_established (const sockinfo &rsi)
587	{	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
588	if (ictx && octx)	707	if (ictx && octx)
589	{	708	{
590	connectmode = conf->connectmode;
591
592	// make sure rekeying timeouts are slightly asymmetric	709	// make sure rekeying timeouts are slightly asymmetric
593	rekey.start (NOW + ::conf.rekey	710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
594	+ (conf->id > THISNODE->id ? 10 : 0));	711	rekey.start (rekey_interval, rekey_interval);
		712
595	keepalive.start (NOW + ::conf.keepalive);	713	keepalive.start (::conf.keepalive);
596		714
597	// send queued packets	715	// send queued packets
598	if (ictx && octx)	716	if (ictx && octx)
599	{	717	{
600	while (tap_packet p = (tap_packet )data_queue.get ())	718	while (tap_packet p = (tap_packet )data_queue.get ())
601	{	719	{
602	send_data_packet (p);	720	if (p->len) send_data_packet (p);
603	delete p;	721	delete p;
604	}	722	}
605		723
606	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	724	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
607	{	725	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);	726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;	727	delete p;
610	}	728	}
611	}	729	}
		730
		731	vpn->connection_established (this);
612	}	732	}
		733	#if 0
613	else	734	else
614	{	735	{
615	retry_cnt = 0;	736	retry_cnt = 0;
616	establish_connection.start (NOW + 5);	737	establish_connection.start (5);
617	keepalive.stop ();	738	keepalive.stop ();
618	rekey.stop ();	739	rekey.stop ();
619	}	740	}
		741	#endif
620	}	742	}
621		743
622	void	744	void
623	connection::reset_si ()	745	connection::reset_si ()
624	{	746	{
		747	if (vpn->can_direct (THISNODE, conf))
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);	748	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
626		749	else
627	// mask out protocols we cannot establish	750	{
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	751	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	752	protocol = 0;
630	if (!conf->dns_port) protocol &= ~PROT_DNSv4;	753	}
631		754
632	si.set (conf, protocol);	755	si.set (conf, protocol);
		756
		757	is_direct = si.valid ();
633	}	758	}
634		759
635	// ensure sockinfo is valid, forward if necessary	760	// ensure sockinfo is valid, forward if necessary
636	const sockinfo &	761	const sockinfo &
637	connection::forward_si (const sockinfo &si) const	762	connection::forward_si (const sockinfo &si) const
638	{	763	{
639	if (!si.valid ())	764	if (!si.valid ())
640	{	765	{
641	connection *r = vpn->find_router ();	766	connection *r = vpn->find_router_for (this);
642		767
643	if (r)	768	if (r)
644	{	769	{
645	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."),
646	conf->nodename, r->conf->nodename, (const char *)r->si);	771	conf->nodename, r->conf->nodename);
647	return r->si;	772	return r->si;
648	}	773	}
649	else	774	else
650	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	775	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
651	conf->nodename);	776	conf->nodename);
652	}	777	}
653		778
654	return si;	779	return si;
655	}	780	}
…		…
665	connection::send_ping (const sockinfo &si, u8 pong)	790	connection::send_ping (const sockinfo &si, u8 pong)
666	{	791	{
667	ping_packet *pkt = new ping_packet;	792	ping_packet *pkt = new ping_packet;
668		793
669	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);
670	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	797	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
671		798
672	delete pkt;	799	delete pkt;
673	}	800	}
674		801
…		…
689	void	816	void
690	connection::send_auth_request (const sockinfo &si, bool initiate)	817	connection::send_auth_request (const sockinfo &si, bool initiate)
691	{	818	{
692	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);
693		820
694	rsachallenge chg;	821	generate_auth_data ();
695	rsa_cache.gen (pkt->id, chg);
696	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	822	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
697		823
698	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);
699
700	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
701		826
702	delete pkt;	827	delete pkt;
703	}	828	}
704		829
705	void	830	void
706	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	831	connection::send_auth_response (const sockinfo &si)
707	{	832	{
708	auth_res_packet *pkt = new auth_res_packet (conf->id);	833	auth_res_packet *pkt = new auth_res_packet (conf->id);
709		834
710	pkt->id = id;	835	auth_hash (rcv_auth, pkt->response.mac);
		836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
711		837
712	rsa_hash (id, chg, pkt->response);
713
714	pkt->hmac_set (octx);
715
716	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);
717
718	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
719		840
720	delete pkt;	841	delete pkt;
721	}	842	}
722		843
723	void	844	void
724	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	845	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
725	{	846	{
726	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	847	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
727	conf->id, rid, (const char *)rsi);	848	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		849	conf->protocols);
728		850
729	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);
730		852
731	r->hmac_set (octx);	853	r->hmac_set (octx);
732	send_vpn_packet (r, si);	854	send_vpn_packet (r, si);
733		855
734	delete r;	856	delete r;
735	}	857	}
736		858
737	void	859	inline void
738	connection::establish_connection_cb (time_watcher &w)	860	connection::establish_connection_cb (ev::timer &w, int revents)
739	{	861	{
740	if (!ictx	862	if (!(ictx && octx)
741	&& conf != THISNODE	863	&& conf != THISNODE
742	&& connectmode != conf_node::C_NEVER	864	&& connectmode != conf_node::C_NEVER
743	&& connectmode != conf_node::C_DISABLED	865	&& connectmode != conf_node::C_DISABLED
744	&& NOW > w.at)	866	&& !w.is_active ())
745	{	867	{
746	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	}
747		875
748	double retry_int = double (retry_cnt & 3	876	last_establish_attempt = ev_now ();
		877
		878	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
749	? (retry_cnt & 3) + 1	879	? (retry_cnt & 3) + 1
750	: 1 << (retry_cnt >> 2));	880	: 1 << (retry_cnt >> 2));
751		881
752	reset_si ();	882	reset_si ();
753		883
754	bool slow = si.prot & PROT_SLOW;	884	bool slow = si.prot & PROT_SLOW;
755		885
756	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);
757	vpn->send_connect_request (conf->id);	890	vpn->send_connect_request (this);
		891	}
758	else	892	else
759	{	893	{
		894	if (si.valid ())
		895	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		896	conf->nodename, (const char *)si);
		897
760	const sockinfo &dsi = forward_si (si);	898	const sockinfo &dsi = forward_si (si);
761		899
762	slow = slow \|\| (dsi.prot & PROT_SLOW);	900	slow = slow \|\| (dsi.prot & PROT_SLOW);
763		901
764	if (dsi.valid () && auth_rate_limiter.can (dsi))	902	if (dsi.valid () && auth_rate_limiter.can (dsi))
…		…
768	else	906	else
769	send_ping (dsi, 0);	907	send_ping (dsi, 0);
770	}	908	}
771	}	909	}
772		910
773	retry_int *= slow ? 8. : 0.7;	911	retry_int *= slow ? 8. : 0.9;
774		912
775	if (retry_int < conf->max_retry)	913	if (retry_int < conf->max_retry)
776	retry_cnt++;	914	retry_cnt++;
777	else	915	else
778	retry_int = conf->max_retry;	916	retry_int = conf->max_retry;
779		917
780	w.start (NOW + retry_int);	918	w.start (retry_int);
781	}	919	}
782	}	920	}
783		921
784	void	922	void
785	connection::reset_connection ()	923	connection::reset_connection ()
…		…
788	{	926	{
789	slog (L_INFO, _("%s(%s): connection lost"),	927	slog (L_INFO, _("%s(%s): connection lost"),
790	conf->nodename, (const char *)si);	928	conf->nodename, (const char *)si);
791		929
792	if (::conf.script_node_down)	930	if (::conf.script_node_down)
793	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	}
794	}	936	}
795		937
796	delete ictx; ictx = 0;	938	delete ictx; ictx = 0;
797	delete octx; octx = 0;	939	delete octx; octx = 0;
798	#if ENABLE_DNS
799	dnsv4_reset_connection ();
800	#endif
801		940
802	si.host = 0;	941	si.host = 0;
803		942
		943	have_snd_auth = false;
		944	have_rcv_auth = false;
		945	auth_expire = 0.;
		946
804	last_activity = 0;	947	last_activity = 0.;
		948	//last_si_change = 0.;
805	retry_cnt = 0;	949	retry_cnt = 0;
806		950
807	rekey.stop ();	951	rekey.stop ();
808	keepalive.stop ();	952	keepalive.stop ();
809	establish_connection.stop ();	953	establish_connection.stop ();
…		…
816	send_reset (si);	960	send_reset (si);
817		961
818	reset_connection ();	962	reset_connection ();
819	}	963	}
820		964
821	void	965	// poor-man's rekeying
822	connection::rekey_cb (time_watcher &w)	966	inline void
		967	connection::rekey_cb (ev::timer &w, int revents)
823	{	968	{
824	reset_connection ();	969	reset_connection ();
825	establish_connection ();	970	establish_connection ();
826	}	971	}
827		972
…		…
843	if (oseqno > MAX_SEQNO)	988	if (oseqno > MAX_SEQNO)
844	rekey ();	989	rekey ();
845	}	990	}
846		991
847	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
848	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1003	connection::inject_data_packet (tap_packet *pkt)
849	{	1004	{
850	if (ictx && octx)	1005	if (ictx && octx)
851	send_data_packet (pkt);	1006	send_data_packet (pkt);
852	else	1007	else
853	{	1008	{
854	if (!broadcast)//DDDD
855	data_queue.put (new tap_packet (*pkt));	1009	data_queue.put (new tap_packet (*pkt));
856		1010	post_inject_queue ();
857	establish_connection ();
858	}	1011	}
859	}	1012	}
860		1013
		1014	void
861	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1015	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
862	{	1016	{
863	if (ictx && octx)	1017	if (ictx && octx)
864	send_vpn_packet (pkt, si, tos);	1018	send_vpn_packet (pkt, si, tos);
865	else	1019	else
866	{	1020	{
867	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1021	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
868		1022	post_inject_queue ();
869	establish_connection ();
870	}	1023	}
871	}	1024	}
872		1025
873	void	1026	void
874	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1027	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
875	{	1028	{
876	last_activity = NOW;	1029	last_activity = ev_now ();
877		1030
878	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.",
879	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;
880		1036
881	switch (pkt->typ ())	1037	switch (pkt->typ ())
882	{	1038	{
883	case vpn_packet::PT_PING:	1039	case vpn_packet::PT_PING:
		1040	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1041
884	// we send pings instead of auth packets after some retries,	1042	// we send pings instead of auth packets after some retries,
885	// so reset the retry counter and establish a connection	1043	// so reset the retry counter and establish a connection
886	// when we receive a ping.	1044	// when we receive a ping.
887	if (!ictx)	1045	if (!ictx)
888	{	1046	{
889	if (auth_rate_limiter.can (rsi))	1047	if (auth_rate_limiter.can (rsi))
890	send_auth_request (rsi, true);	1048	send_auth_request (rsi, true);
891	}	1049	}
892	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.
893	send_ping (rsi, 1); // pong	1053	send_ping (rsi, 1); // pong
894		1054
895	break;	1055	break;
896		1056
897	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 ();
898	break;	1063	break;
899		1064
900	case vpn_packet::PT_RESET:	1065	case vpn_packet::PT_RESET:
901	{	1066	{
902	reset_connection ();	1067	reset_connection ();
903		1068
904	config_packet p = (config_packet ) pkt;	1069	config_packet p = (config_packet ) pkt;
905		1070
906	if (!p->chk_config ())	1071	if (!p->chk_config ())
907	{	1072	{
908	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1073	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
909	conf->nodename, (const char *)rsi);	1074	conf->nodename, (const char *)rsi);
910	connectmode = conf_node::C_DISABLED;	1075	connectmode = conf_node::C_DISABLED;
911	}	1076	}
912	else if (connectmode == conf_node::C_ALWAYS)	1077	else if (connectmode == conf_node::C_ALWAYS)
913	establish_connection ();	1078	establish_connection ();
…		…
915	break;	1080	break;
916		1081
917	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
918	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
919	{	1084	{
920	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
921		1086
922	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);
923		1090
924	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
925	{	1092	{
926	if (p->prot_minor != PROTOCOL_MINOR)	1093	if (p->prot_minor != PROTOCOL_MINOR)
927	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."),
928	conf->nodename, (const char *)rsi,	1095	conf->nodename, (const char *)rsi,
929	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1096	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
930		1097
931	if (p->initiate)	1098	if (p->initiate)
932	send_auth_request (rsi, false);	1099	send_auth_request (rsi, false);
933		1100
934	rsachallenge k;	1101	auth_data auth;
935		1102
936	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1103	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
937	{	1104	{
938	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?"),
939	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));
940	break;
941	}	1107	}
942	else	1108	else
943	{	1109	{
944	delete octx;	1110	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
945		1111
946	octx = new crypto_ctx (k, 1);	1112	rcv_auth = auth;
947	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1113	have_rcv_auth = true;
948		1114
		1115	send_auth_response (rsi);
		1116
		1117	if (chg)
		1118	{
949	conf->protocols = p->protocols;	1119	conf->protocols = p->protocols;
950	features = p->features & config_packet::get_features ();	1120	features = p->features & config_packet::get_features ();
951		1121
952	send_auth_response (rsi, p->id, k);
953
954	connection_established ();	1122	connection_established (rsi);
955
956	break;	1123	}
957	}	1124	}
		1125
		1126	break;
958	}	1127	}
959	else	1128	else
960	slog (L_WARN, _("%s(%s): protocol mismatch"),	1129	slog (L_WARN, _("%s(%s): protocol mismatch."),
961	conf->nodename, (const char *)rsi);	1130	conf->nodename, (const char *)rsi);
962		1131
963	send_reset (rsi);	1132	send_reset (rsi);
964	}	1133	}
965		1134
966	break;	1135	break;
967		1136
968	case vpn_packet::PT_AUTH_RES:	1137	case vpn_packet::PT_AUTH_RES:
969	{	1138	{
970	auth_res_packet p = (auth_res_packet ) pkt;	1139	auth_res_packet p = (auth_res_packet )pkt;
971		1140
972	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1141	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
973		1142
974	if (p->chk_config ())	1143	if (p->chk_config ())
975	{	1144	{
976	if (p->prot_minor != PROTOCOL_MINOR)	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
977	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
978	conf->nodename, (const char *)rsi,
979	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
980
981	rsachallenge chg;
982
983	if (!rsa_cache.find (p->id, chg))
984	{	1146	{
985	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
986	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
987	break;
988	}	1149	}
989	else	1150	else if (!have_snd_auth)
990	{	1151	{
991	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1152	if (p->prot_minor != PROTOCOL_MINOR)
992		1153	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
993	if (!p->hmac_chk (cctx))
994	{
995	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
996	"could be an attack, or just corruption or a synchronization error"),
997	conf->nodename, (const char *)rsi);	1154	conf->nodename, (const char *)rsi,
998	break;	1155	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
999	}
1000	else
1001	{
1002	rsaresponse h;
1003		1156
1004	rsa_hash (p->id, chg, h);
1005
1006	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1007	{
1008	prot_minor = p->prot_minor;	1157	prot_minor = p->prot_minor;
		1158	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
1009		1159
1010	delete ictx; ictx = cctx;	1160	have_snd_auth = true;
1011
1012	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1013
1014	si = rsi;
1015	protocol = rsi.prot;
1016
1017	connection_established ();	1161	connection_established (rsi);
1018
1019	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1020	conf->nodename, (const char *)rsi,
1021	p->prot_major, p->prot_minor);
1022
1023	if (::conf.script_node_up)
1024	run_script (run_script_cb (this, &connection::script_node_up), false);
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
1174	void connection::script_node ()	1359	void
		1360	connection::script_init_env (const char *ext)
1175	{	1361	{
1176	vpn->script_if_up ();
1177
1178	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;
1179	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);
1180	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1378	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1181	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1379	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1182	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1380	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1183	}	1381	}
1184		1382
		1383	inline const char *
1185	const char *connection::script_node_up ()	1384	connection::script_node_up ()
1186	{	1385	{
1187	script_node ();	1386	script_init_connect_env ();
1188		1387
1189	putenv ("STATE=up");	1388	putenv ((char *)"STATE=up");
1190		1389
		1390	char *filename;
		1391	asprintf (&filename,
		1392	"%s/%s",
		1393	confbase,
1191	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1394	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1192	}
1193		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 *
1194	const char *connection::script_node_down ()	1416	connection::script_node_down ()
1195	{	1417	{
1196	script_node ();	1418	script_init_connect_env ();
1197		1419
1198	putenv ("STATE=down");	1420	putenv ((char *)"STATE=down");
1199		1421
1200	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1422	char *filename;
		1423	asprintf (&filename,
		1424	"%s/%s",
		1425	confbase,
		1426	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1427
		1428	return filename;
1201	}	1429	}
1202		1430
1203	connection::connection (struct vpn vpn, conf_node conf)	1431	connection::connection (struct vpn vpn, conf_node conf)
1204	: vpn(vpn), conf(conf)	1432	: vpn(vpn), conf(conf),
1205	, rekey (this, &connection::rekey_cb)
1206	, keepalive (this, &connection::keepalive_cb)
1207	, establish_connection (this, &connection::establish_connection_cb)
1208	#if ENABLE_DNS	1433	#if ENABLE_DNS
1209	, dns (0)	1434	dns (0),
1210	#endif	1435	#endif
		1436	data_queue(conf->max_ttl, conf->max_queue + 1),
		1437	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1211	{	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.;
1212	octx = ictx = 0;	1444	octx = ictx = 0;
1213	retry_cnt = 0;
1214		1445
1215	if (!conf->protocols) // make sure some protocol is enabled	1446	connectmode = conf->connectmode;
1216	conf->protocols = PROT_UDPv4;
1217		1447
1218	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
1219	reset_connection ();	1452	reset_connection ();
1220	}	1453	}
1221		1454
1222	connection::~connection ()	1455	connection::~connection ()
1223	{	1456	{
1224	shutdown ();	1457	shutdown ();
1225	}	1458	}
1226		1459
		1460	void
1227	void connection_init ()	1461	connection_init ()
1228	{	1462	{
1229	auth_rate_limiter.clear ();	1463	auth_rate_limiter.clear ();
1230	reset_rate_limiter.clear ();	1464	reset_rate_limiter.clear ();
1231	}	1465	}
1232		1466

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Comparing gvpe/src/connection.C (file contents): Revision 1.49 by pcg, Sat Mar 12 18:10:40 2005 UTC vs. Revision 1.101 by root, Wed Jul 17 16:40:57 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.49 by pcg, Sat Mar 12 18:10:40 2005 UTC vs.
Revision 1.101 by root, Wed Jul 17 16:40:57 2013 UTC