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

Comparing gvpe/src/connection.C (file contents):
Revision 1.44 by pcg, Fri Mar 4 08:15:04 2005 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 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
		38	#include <openssl/opensslv.h>
28	#include <openssl/rand.h>	39	#include <openssl/rand.h>
29	#include <openssl/evp.h>	40	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
31	#include <openssl/err.h>	42	#include <openssl/err.h>
32		43
33	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
34		50
35	#include "conf.h"	51	#include "conf.h"
36	#include "slog.h"	52	#include "slog.h"
37	#include "device.h"	53	#include "device.h"
38	#include "vpn.h"	54	#include "vpn.h"
39	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
40		57
41	#include "netcompat.h"	58	#include "netcompat.h"
42		59
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	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
48		61
49	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
50	#define HLOG 15	63	#define HLOG 15
51	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
52	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
53	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
54		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb cb, const char warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
55	struct crypto_ctx	112	struct crypto_ctx
56	{	113	{
57	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
58	HMAC_CTX hctx;	115	HMAC_CTX hctx;
59		116
60	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
61	~crypto_ctx ();	118	~crypto_ctx ();
62	};	119	};
63		120
64	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
65	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
66	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
67	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
68	HMAC_CTX_init (&hctx);	153	}
69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
70	}	154	}
71		155
72	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
73	{	157	{
74	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
75	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
76	}	160	}
77		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
78	static void	189	static void
79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
80	{	191	{
81	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
82		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
83	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
84	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
88	EVP_MD_CTX_cleanup (&ctx);
89	}	196	}
90		197
91	struct rsa_entry {	198	void
92	tstamp expire;	199	connection::generate_auth_data ()
93	rsaid id;
94	rsachallenge chg;
95	};
96
97	struct rsa_cache : list<rsa_entry>
98	{	200	{
99	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	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	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
140		206
141	} rsa_cache;	207	// eventual response data
142		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
143	void rsa_cache::cleaner_cb (time_watcher &w)
144	{
145	if (!empty ())
146	{	209	}
147	w.start (NOW + RSA_TTL);
148		210
149	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
150	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
151	i = erase (i);
152	else
153	++i;
154	}
155	}	213	}
156		214
157	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
158		216
159	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
160	{	219	{
161	if (queue[i])	220	queue = new pkt [max_queue];
162	{
163	delete queue[i];
164	j = (j + 1) % QUEUEDEPTH;
165	}
166		221
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;	222	i = 0;
189	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190	}	226	}
191		227
192	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
193	{	229	{
194	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
195	delete queue[i];	233	delete [] queue;
196	}	234	}
197		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
198	struct net_rateinfo {	292	struct net_rateinfo
		293	{
199	u32 host;	294	u32 host;
200	double pcnt, diff;	295	double pcnt, diff;
201	tstamp last;	296	tstamp last;
202	};	297	};
203		298
213		308
214	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	310	bool can (u32 host);
216	};	311	};
217		312
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		314
		315	bool
220	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
221	{	317	{
222	iterator i;	318	iterator i;
223		319
224	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
225	if (i->host == host)	321	if (i->host == host)
226	break;	322	break;
227	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
228	i = erase (i);	324	i = erase (i);
229	else	325	else
230	i++;	326	i++;
231		327
232	if (i == end ())	328	if (i == end ())
…		…
234	net_rateinfo ri;	330	net_rateinfo ri;
235		331
236	ri.host = host;	332	ri.host = host;
237	ri.pcnt = 1.;	333	ri.pcnt = 1.;
238	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
239	ri.last = NOW;	335	ri.last = ev_now ();
240		336
241	push_front (ri);	337	push_front (ri);
242		338
243	return true;	339	return true;
244	}	340	}
…		…
246	{	342	{
247	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
248	erase (i);	344	erase (i);
249		345
250	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252		348
253	ri.last = NOW;	349	ri.last = ev_now ();
254		350
255	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
256		352
257	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
258		354
…		…
270	}	366	}
271	}	367	}
272		368
273	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
274		370
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
278	{	373	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
282		375
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	379	}
288		380
289	void	381	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	383	{
292	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		385	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	387	}
296		388
297	bool	389	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	391	{
300	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		393	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	395	}
304		396
		397	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	399	{
307	type = type_;	400	type = type_;
308		401
309	int src = THISNODE->id;	402	int src = THISNODE->id;
310		403
…		…
315		408
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		411
319	struct vpndata_packet : vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		417	tap_packet unpack (connection conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
320	{	421	{
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;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	423	}
		424	};
332		425
333	void	426	void
334	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
335	{	428	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
339		432
340	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
342		435
343	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
344	{	437	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		439
347	if (cl)	440	if (cl)
348	{	441	{
…		…
354	d[1] = cl;	447	d[1] = cl;
355	}	448	}
356	}	449	}
357	#endif	450	#endif
358		451
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
360		453
361	struct {	454	struct {
362	#if RAND_SIZE	455	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
364	#endif	457	#endif
365	u32 seqno;	458	u32 seqno;
366	} datahdr;	459	} datahdr;
367		460
368	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE	462	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	// NB: a constant (per session) random prefix
		464	// is likely enough, but we don't take any chances.
		465	conn->oiv.get (datahdr.rnd, RAND_SIZE);
371	#endif	466	#endif
372		467
373	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
397	int outl = 0, outl2;	492	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
399	u8 *d;	494	u8 *d;
400	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
401		496
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
403		498
404	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
406		501
407	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	503	d = cdata;
409	else	504	else
410	#endif	505	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
412		507
413	/* this overwrites part of the src mac, but we fix that later */	508	// we play do evil games with the struct layout atm.
		509	// pending better solutions, we at least do some verification.
		510	// this is fine, as we left ISO territory long ago.
		511	require (DATAHDR <= 16);
		512	require ((u8 )(&p->len + 1) == &(p)[0]);
		513
		514	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	516	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	518	outl += outl2;
418		519
…		…
449	}	550	}
450	};	551	};
451		552
452	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
453	{	554	{
454	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
460		559
461	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
462	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		562
464	static u8 get_features ()	563	static u8 get_features ()
465	{	564	{
466	u8 f = 0;	565	u8 f = 0;
467	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
468	f \|= FEATURE_COMPRESSION;	567	f \|= FEATURE_COMPRESSION;
469	#endif	568	#endif
470	#if ENABLE_ROHC	569	#if ENABLE_ROHC
471	f \|= FEATURE_ROHC;	570	f \|= FEATURE_ROHC;
472	#endif	571	#endif
		572	#if ENABLE_BRIDGING
		573	f \|= FEATURE_BRIDGING;
		574	#endif
473	return f;	575	return f;
474	}	576	}
475	};	577	};
476		578
		579	void
477	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
478	{	581	{
479	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
480	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
481	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
482	hmaclen = HMACLENGTH;	585	flags = 0;
483	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
484	challengelen = sizeof (rsachallenge);
485	features = get_features ();	586	features = get_features ();
486		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
490		593
491	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	595	set_hdr (type, dst);
493	}	596	}
494		597
495	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
496	{	600	{
497	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
498	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
499	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
500	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
501	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503	#if 0 // this implementation should handle all flag settings
504	else if (flags != curflags ())
505	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
506	#endif
507	else if (challengelen != sizeof (rsachallenge))
508	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
510	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
511	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
512	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
513	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
514	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	611	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		613	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		614	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		615	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
515	else	616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		619
		620	if (cmp > 0)
		621	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		622	conf->nodename, (const char *)rsi);
		623	else if (cmp == 0)
516	return true;	624	return true;
		625	}
517		626
518	return false;	627	return false;
519	}	628	}
520		629
521	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
522	{	631	{
523	char magic[8];	632	char magic[8];
524	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
525	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
526	u8 pad2, pad3;	635	u8 pad2, pad3;
527	rsaid id;	636	auth_encr encr;
528	rsaencrdata encr;
529		637
530	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
531	{	639	{
532	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
533	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
534	initiate = !!initiate_;	642	initiate = !!initiate_;
535	protocols = protocols_;	643	protocols = protocols_;
536		644
537	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
538	}	646	}
539	};	647	};
540		648
541	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
542	{	650	{
543	rsaid id;
544	u8 pad1, pad2, pad3;
545	u8 response_len; // encrypted length
546	rsaresponse response;	651	auth_response response;
547		652
548	auth_res_packet (int dst)	653	auth_res_packet (int dst)
549	{	654	{
550	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
551		656
552	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
553	}	658	}
554	};	659	};
555		660
…		…
585	};	690	};
586		691
587	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
588		693
589	void	694	void
590	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
591	{	696	{
592	if (ictx && octx)	697	if (!have_snd_auth \|\| !have_rcv_auth)
		698	return;
		699
		700	si = rsi;
		701	protocol = rsi.prot;
		702
		703	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		704	conf->nodename, (const char *)rsi,
		705	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		706	PROTOCOL_MAJOR, prot_minor);
		707
		708	if (::conf.script_node_up)
		709	{
		710	run_script_cb *cb = new run_script_cb;
		711	cb->set<connection, &connection::script_node_up> (this);
		712	run_script_queued (cb, _("node-up command execution failed, continuing."));
593	{	713	}
594	connectmode = conf->connectmode;	714
		715	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		716	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
595		717
		718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
596	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
597	rekey.start (NOW + ::conf.rekey	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
598	+ (conf->id > THISNODE->id ? 10 : 0));	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
599	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
600		730
601	// send queued packets	731	// send queued packets
602	if (ictx && octx)
603	{
604	while (tap_packet p = (tap_packet )data_queue.get ())	732	while (tap_packet p = (tap_packet )data_queue.get ())
605	{	733	{
606	send_data_packet (p);	734	if (p->len) send_data_packet (p);
607	delete p;	735	delete p;
608	}	736	}
609		737
610	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	738	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
611	{	739	{
612	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613	delete p;	741	delete p;
614	}
615	}
616	}	742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
		748	connection::reset_si ()
		749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
617	else	752	else
618	{	753	{
619	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
620	establish_connection.start (NOW + 5);	755	protocol = 0;
621	keepalive.stop ();
622	rekey.stop ();
623	}	756	}
624	}
625
626	void
627	connection::reset_si ()
628	{
629	protocol = best_protocol (THISNODE->protocols & conf->protocols);
630
631	// mask out protocols we cannot establish
632	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
633	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
634	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
635		757
636	si.set (conf, protocol);	758	si.set (conf, protocol);
637	}	759	}
638		760
639	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
640	const sockinfo &	762	const sockinfo &
641	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
642	{	764	{
643	if (!si.valid ())	765	if (!si.valid ())
644	{	766	{
645	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
646		768
647	if (r)	769	if (r)
648	{	770	{
649	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
650	conf->nodename, r->conf->nodename);	772	conf->nodename, r->conf->nodename);
651	return r->si;	773	return r->si;
652	}	774	}
653	else	775	else
654	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655	conf->nodename);	777	conf->nodename);
656	}	778	}
657		779
658	return si;	780	return si;
659	}	781	}
660		782
661	void	783	void
662	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
663	{	785	{
664	bool ok;	786	if (!vpn->send_vpn_packet (pkt, si, tos))
665		787	reset_connection ("packet send error");
666	switch (si.prot)
667	{
668	case PROT_IPv4:
669	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
670	case PROT_UDPv4:
671	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
672	#if ENABLE_TCP
673	case PROT_TCPv4:
674	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
675	#endif
676	#if ENABLE_ICMP
677	case PROT_ICMPv4:
678	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
679	#endif
680	#if ENABLE_DNS
681	case PROT_DNSv4:
682	ok = send_dnsv4_packet (pkt, si, tos); break;
683	#endif
684
685	default:
686	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
687	ok = false;
688	}
689
690	if (!ok)
691	reset_connection ();
692	}	788	}
693		789
694	void	790	void
695	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
696	{	792	{
697	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
698		794
699	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	795	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		796
		797	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
700	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
701		799
702	delete pkt;	800	delete pkt;
703	}	801	}
704		802
…		…
719	void	817	void
720	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
721	{	819	{
722	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	820	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
723		821
724	rsachallenge chg;	822	generate_auth_data ();
725	rsa_cache.gen (pkt->id, chg);
726	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
727		824
728	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	825	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
729
730	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
731		827
732	delete pkt;	828	delete pkt;
733	}	829	}
734		830
735	void	831	void
736	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
737	{	833	{
738	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
739		835
740	pkt->id = id;	836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		837	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
741		838
742	rsa_hash (id, chg, pkt->response);
743
744	pkt->hmac_set (octx);
745
746	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
747
748	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
749		841
750	delete pkt;	842	delete pkt;
751	}	843	}
752		844
753	void	845	void
754	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
755	{	847	{
756	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
757	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
758		851
759	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	852	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
760		853
761	r->hmac_set (octx);	854	r->hmac_set (octx);
762	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
763		856
764	delete r;	857	delete r;
765	}	858	}
766		859
767	void	860	inline void
768	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
769	{	862	{
770	if (!ictx	863	if (!(ictx && octx)
771	&& conf != THISNODE	864	&& conf != THISNODE
772	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
773	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
774	&& NOW > w.at)	867	&& !w.is_active ())
775	{	868	{
776	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
777		870	// and stop trying. should probably be handled by a per-connection expire handler.
778	if (retry_int < conf->max_retry)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
779	retry_cnt++;	874	return;
780	else	875	}
781	retry_int = conf->max_retry;
782		876
783	w.start (NOW + retry_int);	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		880	? (retry_cnt & 3) + 1
		881	: 1 << (retry_cnt >> 2));
784		882
785	reset_si ();	883	reset_si ();
786		884
787	if (si.prot && !si.host)	885	bool slow = (si.prot & PROT_SLOW) \|\| (conf->low_power \|\| THISNODE->low_power);
		886
		887	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		888	{
		889	/TODO/ /* start the timer so we don't recurse endlessly */
		890	w.start (1);
788	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
789	else	893	else
790	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
791	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow \|\| (dsi.prot & PROT_SLOW);
792		902
793	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
794	{	904	{
795	if (retry_cnt < 4)	905	// use ping after the first few retries
		906	// TODO: on rekeys, the other node might not interpret ping correctly,
		907	// TODO: as it will still have a valid connection
		908	if (retry_cnt < 4 && (!conf->low_power \|\| THISNODE->low_power))
796	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
797	else	910	else
798	send_ping (dsi, 0);	911	send_ping (dsi, 0);
799	}	912	}
800	}	913	}
801	}
802	}
803		914
		915	retry_int *= slow ? 4. : 0.9;
		916
		917	if (retry_int < conf->max_retry)
		918	retry_cnt++;
		919	else
		920	retry_int = conf->max_retry;
		921
		922	w.start (retry_int);
		923	}
		924	}
		925
804	void	926	void
805	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
806	{	928	{
807	if (ictx && octx)	929	if (ictx && octx)
808	{	930	{
809	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
810	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
811		933
812	if (::conf.script_node_down)	934	if (::conf.script_node_down)
813	run_script (run_script_cb (this, &connection::script_node_down), false);	935	{
		936	run_script_cb *cb = new run_script_cb;
		937	cb->set<connection, &connection::script_node_down> (this);
		938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
814	}	940	}
815		941
816	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
817	delete octx; octx = 0;	943	delete octx; octx = 0;
818	#if ENABLE_DNS
819	delete dns; dns = 0;
820	#endif
821		944
822	si.host = 0;	945	si.host = 0;
823		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
824	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
825	retry_cnt = 0;	953	retry_cnt = 0;
826		954
827	rekey.stop ();	955	rekey.stop ();
828	keepalive.stop ();	956	keepalive.stop ();
829	establish_connection.stop ();	957	establish_connection.stop ();
…		…
833	connection::shutdown ()	961	connection::shutdown ()
834	{	962	{
835	if (ictx && octx)	963	if (ictx && octx)
836	send_reset (si);	964	send_reset (si);
837		965
838	reset_connection ();	966	reset_connection ("shutdown");
839	}	967	}
840		968
841	void	969	// poor-man's rekeying
842	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
843	{	972	{
844	reset_connection ();	973	reset_connection ("rekeying");
845	establish_connection ();	974	establish_connection ();
846	}	975	}
847		976
848	void	977	void
849	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
863	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
864	rekey ();	993	rekey ();
865	}	994	}
866		995
867	void	996	void
		997	connection::post_inject_queue ()
		998	{
		999	// force a connection every now and when when packets are sent (max 1/s)
		1000	if (ev_now () - last_establish_attempt >= (conf->low_power \|\| THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1001	establish_connection.stop ();
		1002
		1003	establish_connection ();
		1004	}
		1005
		1006	void
868	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
869	{	1008	{
870	if (ictx && octx)	1009	if (ictx && octx)
871	send_data_packet (pkt);	1010	send_data_packet (pkt);
872	else	1011	else
873	{	1012	{
874	if (!broadcast)//DDDD
875	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
876		1014	post_inject_queue ();
877	establish_connection ();
878	}	1015	}
879	}	1016	}
880		1017
		1018	void
881	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
882	{	1020	{
883	if (ictx && octx)	1021	if (ictx && octx)
884	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
885	else	1023	else
886	{	1024	{
887	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
888		1026	post_inject_queue ();
889	establish_connection ();
890	}	1027	}
891	}	1028	}
892		1029
893	void	1030	void
894	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
895	{	1032	{
896	last_activity = NOW;	1033	last_activity = ev_now ();
897		1034
898	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1035	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
899	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1036	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1037
		1038	if (connectmode == conf_node::C_DISABLED)
		1039	return;
900		1040
901	switch (pkt->typ ())	1041	switch (pkt->typ ())
902	{	1042	{
903	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
904	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
905	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
906	// when we receive a ping.	1048	// when we receive a ping.
907	if (!ictx)	1049	if (!ictx)
908	{	1050	{
909	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
910	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
911	}	1053	}
912	else	1054	else
		1055	// we would love to change the socket address here, but ping's aren't
		1056	// authenticated, so we best ignore it.
913	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
914		1058
915	break;	1059	break;
916		1060
917	case vpn_packet::PT_PONG:	1061	case vpn_packet::PT_PONG:
		1062	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1063
		1064	// a PONG might mean that the other side doesn't really know
		1065	// about our desire for communication.
		1066	establish_connection ();
918	break;	1067	break;
919		1068
920	case vpn_packet::PT_RESET:	1069	case vpn_packet::PT_RESET:
		1070	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1071
		1072	if (ictx && octx)
921	{	1073	{
922	reset_connection ();	1074	reset_connection ("remote reset");
923		1075
924	config_packet p = (config_packet ) pkt;	1076	config_packet p = (config_packet ) pkt;
925		1077
926	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
927	{
928	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
929	conf->nodename, (const char *)rsi);
930	connectmode = conf_node::C_DISABLED;
931	}
932	else if (connectmode == conf_node::C_ALWAYS)
933	establish_connection ();	1079	establish_connection ();
934	}	1080	}
		1081
935	break;	1082	break;
936		1083
937	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
938	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
939	{	1086	{
940	auth_req_packet p = (auth_req_packet ) pkt;	1087	auth_req_packet p = (auth_req_packet )pkt;
941		1088
942	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1089	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1090	conf->nodename, p->initiate ? "initiate" : "reply",
		1091	p->protocols, p->features);
943		1092
944	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1093	if (memcmp (p->magic, MAGIC, 8))
		1094	{
		1095	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1096	conf->nodename, (const char *)rsi);
		1097	}
		1098	else if (p->chk_config (conf, rsi))
945	{	1099	{
946	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
947	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1101	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
948	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
949	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
950		1104
951	if (p->initiate)	1105	if (p->initiate)
		1106	{
952	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
953		1108
954	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
955		1112
		1113	auth_data auth;
		1114
956	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
957	{	1116	{
958	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
959	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
960	break;
961	}	1119	}
962	else	1120	else
963	{	1121	{
964	delete octx;	1122	bool chg = !have_rcv_auth \|\| !slow_memeq (&rcv_auth, &auth, sizeof auth);
965		1123
966	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
967	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
968		1126
969	// compatibility code, remove when no longer required	1127	send_auth_response (rsi);
970	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
971		1128
		1129	if (chg)
		1130	{
972	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
973	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
974		1133
975	send_auth_response (rsi, p->id, k);
976
977	connection_established ();	1134	connection_established (rsi);
978
979	break;	1135	}
980	}	1136	}
		1137
		1138	break;
981	}	1139	}
982	else
983	slog (L_WARN, _("%s(%s): protocol mismatch"),
984	conf->nodename, (const char *)rsi);
985		1140
986	send_reset (rsi);	1141	send_reset (rsi);
987	}	1142	}
988		1143
989	break;	1144	break;
990		1145
991	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
992	{	1147	{
993	auth_res_packet p = (auth_res_packet ) pkt;	1148	auth_res_packet p = (auth_res_packet )pkt;
994		1149
995	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
996		1151
997	if (p->chk_config ())	1152	auth_mac local_mac;
		1153	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1154
		1155	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
998	{	1156	{
999	if (p->prot_minor != PROTOCOL_MINOR)
1000	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1001	conf->nodename, (const char *)rsi,
1002	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1003
1004	rsachallenge chg;
1005
1006	if (!rsa_cache.find (p->id, chg))
1007	{
1008	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1009	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
1010	break;
1011	}	1159	}
1012	else	1160	else if (!have_snd_auth)
1013	{	1161	{
1014	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1015		1163
1016	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
1017	{
1018	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1019	"could be an attack, or just corruption or a synchronization error"),
1020	conf->nodename, (const char *)rsi);
1021	break;
1022	}
1023	else
1024	{
1025	rsaresponse h;
1026
1027	rsa_hash (p->id, chg, h);
1028
1029	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1030	{
1031	prot_minor = p->prot_minor;
1032
1033	delete ictx; ictx = cctx;
1034
1035	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1036
1037	si = rsi;
1038	protocol = rsi.prot;
1039
1040	connection_established ();	1165	connection_established (rsi);
1041
1042	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1043	conf->nodename, (const char *)rsi,
1044	p->prot_major, p->prot_minor);
1045
1046	if (::conf.script_node_up)
1047	run_script (run_script_cb (this, &connection::script_node_up), false);
1048
1049	break;
1050	}
1051	else
1052	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1053	conf->nodename, (const char *)rsi);
1054	}
1055
1056	delete cctx;
1057	}
1058	}	1166	}
1059	}	1167	}
1060
1061	send_reset (rsi);
1062	break;	1168	break;
1063		1169
1064	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1065	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1066	send_reset (rsi);	1172	send_reset (rsi);
…		…
1072	if (ictx && octx)	1178	if (ictx && octx)
1073	{	1179	{
1074	vpndata_packet p = (vpndata_packet )pkt;	1180	vpndata_packet p = (vpndata_packet )pkt;
1075		1181
1076	if (!p->hmac_chk (ictx))	1182	if (!p->hmac_chk (ictx))
		1183	{
		1184	// rekeying often creates temporary hmac auth floods
		1185	// we assume they don't take longer than a few seconds normally,
		1186	// and suppress messages and resets during that time.
		1187	//TODO: should be done per source address
		1188	if (!hmac_error)
		1189	{
		1190	hmac_error = ev_now () + 3;
		1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
		1195	else
		1196	{
1077	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1078	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1079	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1080	else	1203	else
1081	{	1204	{
1082	u32 seqno;	1205	u32 seqno;
1083	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1084		1208
1085	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1086	{	1212	{
1087	vpn->tap->send (d);	1213	vpn->tap->send (d);
1088		1214
1089	if (si != rsi)	1215	if (si != rsi)
1090	{	1216	{
1091	// fast re-sync on connection changes, useful especially for tcp/ip	1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
1092	si = rsi;	1219	// {
1093
1094	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1095	conf->nodename, (const char )si, (const char )rsi);	1221	conf->nodename, (const char )si, (const char )rsi);
		1222
		1223	si = rsi;
		1224
		1225	if (::conf.script_node_change)
		1226	{
		1227	run_script_cb *cb = new run_script_cb;
		1228	cb->set<connection, &connection::script_node_change> (this);
		1229	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1230	}
		1231
		1232	// }
		1233	//else
		1234	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1235	// conf->nodename, (const char )si, (const char )rsi);
1096	}	1236	}
		1237	}
		1238	else if (seqclass == 1) // far history
		1239	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1240	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1241	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1242	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1243	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1244	else if (seqclass == 3) // reset
		1245	{
		1246	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1247	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1248	send_reset (rsi);
1097	}	1249	}
1098		1250
1099	delete d;	1251	delete d;
1100	break;	1252	break;
1101	}	1253	}
…		…
1105	break;	1257	break;
1106		1258
1107	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1108	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1109	{	1261	{
1110	connect_req_packet p = (connect_req_packet ) pkt;	1262	connect_req_packet p = (connect_req_packet )pkt;
1111		1263
1112	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1113	connection *c = vpn->conns[p->id - 1];
1114	conf->protocols = p->protocols;
1115
1116	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1117	conf->id, p->id, c->ictx && c->octx);
1118
1119	if (c->ictx && c->octx)
1120	{	1265	{
		1266	connection *c = vpn->conns[p->id - 1];
		1267	conf->protocols = p->protocols;
		1268
		1269	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1270	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1271	p->protocols,
		1272	c->ictx && c->octx);
		1273
		1274	if (c->ictx && c->octx)
		1275	{
1121	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1122	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1123	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1124	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1279	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1280	}
		1281	else
		1282	c->establish_connection ();
1125	}	1283	}
1126	else	1284	else
1127	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1128	}	1288	}
1129		1289
1130	break;	1290	break;
1131		1291
1132	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1133	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1134	{	1294	{
1135	connect_info_packet p = (connect_info_packet )pkt;	1295	connect_info_packet p = (connect_info_packet )pkt;
1136		1296
1137	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1297	if (p->id > 0 && p->id <= vpn->conns.size ())
1138	{	1298	{
1139	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1140		1300
1141	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1142	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1143	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1144		1304
1145	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1146	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1306	conf->nodename,
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si,
		1309	p->protocols,
		1310	protocol,
		1311	p->si.supported_protocols (c->conf),
		1312	!c->ictx && !c->octx);
1147		1313
1148	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1149		1315
1150	if (dsi.valid ())	1316	if (dsi.valid ())
1151	c->send_auth_request (dsi, true);	1317	c->send_auth_request (dsi, true);
		1318	else
		1319	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si);
1152	}	1322	}
		1323	else
		1324	slog (L_WARN,
		1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1326	p->id);
1153	}	1327	}
1154		1328
1155	break;	1329	break;
1156		1330
1157	default:	1331	default:
1158	send_reset (rsi);	1332	send_reset (rsi);
1159	break;	1333	break;
1160	}	1334	}
1161	}	1335	}
1162		1336
1163	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1164	{	1339	{
1165	if (NOW >= last_activity + ::conf.keepalive + 30)	1340	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1341
		1342	if (when >= 0)
		1343	w.start (when);
		1344	else if (when < -15)
1166	{	1345	{
1167	reset_connection ();	1346	reset_connection ("keepalive overdue");
1168	establish_connection ();	1347	establish_connection ();
1169	}	1348	}
1170	else if (NOW < last_activity + ::conf.keepalive)
1171	w.start (last_activity + ::conf.keepalive);
1172	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1173	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1174	{	1351	{
		1352	w.start (3);
1175	send_ping (si);	1353	send_ping (si);
1176	w.start (NOW + 5);
1177	}	1354	}
1178	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1179	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1180	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1181	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1182	else	1359	else
1183	reset_connection ();	1360	reset_connection ("keepalive timeout");
1184	}	1361	}
1185		1362
		1363	void
1186	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1187	{	1365	{
1188	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1366	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1189		1367
1190	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1368	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1369	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1370	THISNODE->protocols);
1191	p->hmac_set (octx);	1371	p->hmac_set (octx);
1192	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1193		1373
1194	delete p;	1374	delete p;
1195	}	1375	}
1196		1376
1197	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1198	{	1379	{
1199	vpn->script_if_up ();
1200
1201	char *env;	1380	char *env;
		1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1385	conf->id & 0xff); putenv (env);
		1386	}
		1387
		1388	void
		1389	connection::script_init_connect_env ()
		1390	{
		1391	vpn->script_init_env ();
		1392
		1393	char *env;
1202	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1394	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1395	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1203	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1204	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1205	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1206	}	1399	}
1207		1400
		1401	inline const char *
1208	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1209	{	1403	{
1210	script_node ();	1404	script_init_connect_env ();
1211		1405
1212	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1213		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1214	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1215	}
1216		1413
		1414	return filename;
		1415	}
		1416
		1417	inline const char *
		1418	connection::script_node_change ()
		1419	{
		1420	script_init_connect_env ();
		1421
		1422	putenv ((char *)"STATE=change");
		1423
		1424	char *filename;
		1425	asprintf (&filename,
		1426	"%s/%s",
		1427	confbase,
		1428	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1429
		1430	return filename;
		1431	}
		1432
		1433	inline const char *
1217	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1218	{	1435	{
1219	script_node ();	1436	script_init_connect_env ();
1220		1437
1221	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1222		1439
1223	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
		1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1445
		1446	return filename;
1224	}	1447	}
1225		1448
1226	connection::connection (struct vpn vpn, conf_node conf)	1449	connection::connection (struct vpn vpn, conf_node conf)
1227	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1228	, rekey (this, &connection::rekey_cb)
1229	, keepalive (this, &connection::keepalive_cb)
1230	, establish_connection (this, &connection::establish_connection_cb)
1231	#if ENABLE_DNS	1451	#if ENABLE_DNS
1232	, dns (0)	1452	dns (0),
1233	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1234	{	1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
		1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1460
		1461	last_establish_attempt = 0.;
1235	octx = ictx = 0;	1462	octx = ictx = 0;
1236	retry_cnt = 0;
1237		1463
1238	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1239	conf->protocols = PROT_UDPv4;
1240		1465
1241	connectmode = conf_node::C_ALWAYS; // initial setting	1466	// queue a dummy packet to force an initial connection attempt
		1467	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1468	vpn_queue.put (new net_packet);
		1469
1242	reset_connection ();	1470	reset_connection ("startup");
1243	}	1471	}
1244		1472
1245	connection::~connection ()	1473	connection::~connection ()
1246	{	1474	{
1247	shutdown ();	1475	shutdown ();
1248	}	1476	}
1249		1477
		1478	void
1250	void connection_init ()	1479	connection_init ()
1251	{	1480	{
1252	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1253	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1254	}	1483	}
1255		1484

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Comparing gvpe/src/connection.C (file contents): Revision 1.44 by pcg, Fri Mar 4 08:15:04 2005 UTC vs. Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.44 by pcg, Fri Mar 4 08:15:04 2005 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC