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

Comparing gvpe/src/connection.C (file contents):
Revision 1.8 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.105 by root, Fri Jul 19 18:22:54 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
73		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	189	}
81		190
82	struct rsa_entry {	191	void
83	tstamp expire;	192	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	193	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		199
132	} rsa_cache;	200	// eventual response data
133		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	202	}
140	w.at = NOW + RSA_TTL;
141		203
142	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
143	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	206	}
149		207
150	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
151		209
152	void pkt_queue::put (tap_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
153	{	212	{
154	if (queue[i])	213	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		214
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	215	i = 0;
182	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	219	}
184		220
185	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
186	{	222	{
187	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
188	delete queue[i];	226	delete [] queue;
189	}	227	}
190		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
191	struct net_rateinfo {	285	struct net_rateinfo
		286	{
192	u32 host;	287	u32 host;
193	double pcnt, diff;	288	double pcnt, diff;
194	tstamp last;	289	tstamp last;
195	};	290	};
196		291
197	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	294	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
201	{	296	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		301
206	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	303	bool can (u32 host);
208	};	304	};
209		305
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		307
		308	bool
212	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
213	{	310	{
214	iterator i;	311	iterator i;
215		312
216	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
217	if (i->host == host)	314	if (i->host == host)
218	break;	315	break;
219	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	317	i = erase (i);
221	else	318	else
222	i++;	319	i++;
223		320
224	if (i == end ())	321	if (i == end ())
225	{	322	{
226	net_rateinfo ri;	323	net_rateinfo ri;
227		324
228	ri.host = host;	325	ri.host = host;
229	ri.pcnt = 1.;	326	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	327	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	328	ri.last = ev_now ();
232		329
233	push_front (ri);	330	push_front (ri);
234		331
235	return true;	332	return true;
236	}	333	}
237	else	334	else
238	{	335	{
239	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
240	erase (i);	337	erase (i);
241		338
242	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		341
245	ri.last = NOW;	342	ri.last = ev_now ();
246		343
		344	double dif = ri.diff / ri.pcnt;
		345
247	bool send = ri.diff / ri.pcnt > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
248		347
		348	if (dif > NRL_MAXDIF)
		349	{
		350	ri.pcnt = 1.;
		351	ri.diff = NRL_MAXDIF;
		352	}
249	if (send)	353	else if (send)
250	ri.pcnt++;	354	ri.pcnt++;
251		355
252	push_front (ri);	356	push_front (ri);
253		357
254	return send;	358	return send;
255	}	359	}
256	}	360	}
257		361
258	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
259		363
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
261
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
263	{	366	{
264	unsigned int xlen;
265
266	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
267		368
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
270	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
272	}	372	}
273		373
274	void	374	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	376	{
277	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
278		378	hmac_gen (ctx, hmac_digest);
279	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
280	}	380	}
281		381
282	bool	382	bool
283	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
284	{	384	{
285	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		386	hmac_gen (ctx, hmac_digest);
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	388	}
289		389
		390	void
290	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	392	{
292	type = type_;	393	type = type_;
293		394
294	int src = THISNODE->id;	395	int src = THISNODE->id;
295		396
299	}	400	}
300		401
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		404
304	struct vpndata_packet:vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		410	tap_packet unpack (connection conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
305	{	414	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307
308	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
309	tap_packet unpack (connection conn, u32 &seqno);
310	private:
311
312	const u32 data_hdr_size () const
313	{
314	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	416	}
		417	};
317		418
318	void	419	void
319	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
320	{	421	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	423	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
324		425
325	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
327	u32 cl;
328		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
330	if (cl)	433	if (cl)
331	{	434	{
332	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
333	d = cdata;	436	d = cdata;
334	l = cl + 2;	437	l = cl + 2;
335		438
336	d[0] = cl >> 8;	439	d[0] = cl >> 8;
337	d[1] = cl;	440	d[1] = cl;
		441	}
338	}	442	}
339	#endif	443	#endif
340		444
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		446
343	struct {	447	struct {
344	#if RAND_SIZE	448	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
346	#endif	450	#endif
347	u32 seqno;	451	u32 seqno;
348	} datahdr;	452	} datahdr;
349		453
350	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	455	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
353	#endif	459	#endif
354		460
355	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	464	outl += outl2;
359		465
360	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	468	(unsigned char *) d, l));
363	outl += outl2;	469	outl += outl2;
364		470
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	472	outl += outl2;
367		473
368	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
369		475
370	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	485	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
381	u8 *d;	487	u8 *d;
382	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
383		489
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		491
386	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
388		494
389	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	496	d = cdata;
391	else	497	else
392	#endif	498	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
394		500
395	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 )(&p->len + 1) == &(p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	509	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	511	outl += outl2;
400		512
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	514	outl += outl2;
403		515
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	516	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		517
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	543	}
432	};	544	};
433		545
434	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
435	{	547	{
436	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
442		552
443	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
444	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f \|= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f \|= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f \|= FEATURE_BRIDGING;
		567	#endif
445	return 0x80	568	return f;
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	569	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	570	};
452		571
		572	void
453	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
454	{	574	{
455	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	578	flags = 0;
459	flags = curflags ();	579	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		586
466	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	588	set_hdr (type, dst);
468	}	589	}
469		590
470	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	593	{
472	return prot_major == PROTOCOL_MAJOR	594	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()	597	else if (randsize != RAND_SIZE)
476	&& challengelen == sizeof (rsachallenge)	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
		617	return true;
		618	}
		619
		620	return false;
		621	}
		622
482	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
483	{	624	{
484	char magic[8];	625	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	628	u8 pad2, pad3;
488	rsaid id;	629	auth_encr encr;
489	rsaencrdata encr;
490		630
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	632	{
493	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	635	initiate = !!initiate_;
496	protocols = protocols_;	636	protocols = protocols_;
497		637
498	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
499	}	639	}
500	};	640	};
501		641
502	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	643	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	644	auth_response response;
508		645
509	auth_res_packet (int dst)	646	auth_res_packet (int dst)
510	{	647	{
511	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
512		649
513	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
514	}	651	}
515	};	652	};
516		653
…		…
546	};	683	};
547		684
548	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
549		686
550	void	687	void
		688	connection::connection_established (const sockinfo &rsi)
		689	{
		690	if (!have_snd_auth \|\| !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
		723	if (ictx && octx)
		724	{
		725	while (tap_packet p = (tap_packet )data_queue.get ())
		726	{
		727	if (p->len) send_data_packet (p);
		728	delete p;
		729	}
		730
		731	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
		736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
551	connection::reset_si ()	742	connection::reset_si ()
552	{	743	{
		744	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		746	else
555	// mask out protocols we cannot establish	747	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	749	protocol = 0;
		750	}
558		751
559	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
560	}	755	}
561		756
562	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
563	const sockinfo &	758	const sockinfo &
564	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
565	{	760	{
566	if (!si.valid ())	761	if (!si.valid ())
567	{	762	{
568	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
569		764
570	if (r)	765	if (r)
571	{	766	{
572	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
573	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
574	return r->si;	769	return r->si;
575	}	770	}
576	else	771	else
577	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
578	conf->nodename);	773	conf->nodename);
579	}	774	}
580		775
581	return si;	776	return si;
582	}	777	}
583		778
584	void	779	void
		780	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		781	{
		782	if (!vpn->send_vpn_packet (pkt, si, tos))
		783	reset_connection ();
		784	}
		785
		786	void
585	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
586	{	788	{
587	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
588		790
589	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
590	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
591		795
592	delete pkt;	796	delete pkt;
593	}	797	}
594		798
595	void	799	void
…		…
598	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	802	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
599	{	803	{
600	config_packet *pkt = new config_packet;	804	config_packet *pkt = new config_packet;
601		805
602	pkt->setup (vpn_packet::PT_RESET, conf->id);	806	pkt->setup (vpn_packet::PT_RESET, conf->id);
603	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);	807	send_vpn_packet (pkt, si, IPTOS_MINCOST);
604		808
605	delete pkt;	809	delete pkt;
606	}	810	}
607	}	811	}
608		812
609	void	813	void
610	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
611	{	815	{
612	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
613		817
614	rsachallenge chg;	818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
615		820
616	rsa_cache.gen (pkt->id, chg);
617
618	if (0 > RSA_public_encrypt (sizeof chg,
619	(unsigned char )&chg, (unsigned char )&pkt->encr,
620	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
621	fatal ("RSA_public_encrypt error");
622
623	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
624
625	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
626
627		823
628	delete pkt;	824	delete pkt;
629	}	825	}
630		826
631	void	827	void
632	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
633	{	829	{
634	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
635		831
636	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
637		834
638	rsa_hash (id, chg, pkt->response);
639
640	pkt->hmac_set (octx);
641
642	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
643
644	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
645		837
646	delete pkt;	838	delete pkt;
647	}	839	}
648		840
649	void	841	void
650	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
651	{	843	{
652	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
653	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
654		847
655	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
656		849
657	r->hmac_set (octx);	850	r->hmac_set (octx);
658	vpn->send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
659		852
660	delete r;	853	delete r;
661	}	854	}
662		855
663	void	856	inline void
664	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
665	{	858	{
666	if (ictx \|\| conf == THISNODE	859	if (!(ictx && octx)
		860	&& conf != THISNODE
667	\|\| connectmode == conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
668	\|\| connectmode == conf_node::C_DISABLED)	862	&& connectmode != conf_node::C_DISABLED
669	w.at = TSTAMP_CANCEL;	863	&& !w.is_active ())
670	else if (w.at <= NOW)
671	{	864	{
672	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
673		866	// and stop trying. should probably be handled by a per-connection expire handler.
674	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
675	retry_cnt++;	870	return;
		871	}
676		872
677	w.at = NOW + retry_int;	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
678		878
679	reset_si ();	879	reset_si ();
680		880
681	if (si.prot && !si.host)	881	bool slow = si.prot & PROT_SLOW;
		882
		883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/TODO/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
682	vpn->connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
683	else	889	else
684	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
685	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow \|\| (dsi.prot & PROT_SLOW);
686		898
687	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
688	{	900	{
689	if (retry_cnt < 4)	901	if (retry_cnt < 4)
690	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
691	else	903	else
692	send_ping (dsi, 0);	904	send_ping (dsi, 0);
693	}	905	}
694	}	906	}
		907
		908	retry_int *= slow ? 8. : 0.9;
		909
		910	if (retry_int < conf->max_retry)
		911	retry_cnt++;
		912	else
		913	retry_int = conf->max_retry;
		914
		915	w.start (retry_int);
695	}	916	}
696	}	917	}
697		918
698	void	919	void
699	connection::reset_connection ()	920	connection::reset_connection ()
…		…
702	{	923	{
703	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
704	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
705		926
706	if (::conf.script_node_down)	927	if (::conf.script_node_down)
707	run_script (run_script_cb (this, &connection::script_node_down), false);	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
		931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
708	}	933	}
709		934
710	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
711	delete octx; octx = 0;	936	delete octx; octx = 0;
712		937
713	si.host= 0;	938	si.host = 0;
714		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
715	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
716	retry_cnt = 0;	946	retry_cnt = 0;
717		947
718	rekey.reset ();	948	rekey.stop ();
719	keepalive.reset ();	949	keepalive.stop ();
720	establish_connection.reset ();	950	establish_connection.stop ();
721	}	951	}
722		952
723	void	953	void
724	connection::shutdown ()	954	connection::shutdown ()
725	{	955	{
…		…
727	send_reset (si);	957	send_reset (si);
728		958
729	reset_connection ();	959	reset_connection ();
730	}	960	}
731		961
732	void	962	// poor-man's rekeying
733	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
734	{	965	{
735	w.at = TSTAMP_CANCEL;
736
737	reset_connection ();	966	reset_connection ();
738	establish_connection ();	967	establish_connection ();
739	}	968	}
740		969
741	void	970	void
742	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
743	{	972	{
744	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
745	int tos = 0;	974	int tos = 0;
746		975
747	if (conf->inherit_tos	976	// I am not hilarious about peeking into packets, but so be it.
748	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	977	if (conf->inherit_tos && pkt->is_ipv4 ())
749	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
750	tos = (*pkt)[15] & IPTOS_TOS_MASK;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
751		979
752	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	980	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
753	vpn->send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
754		982
755	delete p;	983	delete p;
756		984
757	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
758	rekey ();	986	rekey ();
759	}	987	}
760		988
761	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
762	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
763	{	1001	{
764	if (ictx && octx)	1002	if (ictx && octx)
765	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
766	else	1004	else
767	{	1005	{
768	if (!broadcast)//DDDD
769	queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
770		1007	post_inject_queue ();
771	establish_connection ();
772	}	1008	}
773	}	1009	}
774		1010
		1011	void
775	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
776	{	1013	{
777	if (ictx && octx)	1014	if (ictx && octx)
778	vpn->send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
779	else	1016	else
780	establish_connection ();	1017	{
		1018	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		1019	post_inject_queue ();
		1020	}
781	}	1021	}
782		1022
783	void	1023	void
784	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
785	{	1025	{
786	last_activity = NOW;	1026	last_activity = ev_now ();
787		1027
788	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
789	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
790		1033
791	switch (pkt->typ ())	1034	switch (pkt->typ ())
792	{	1035	{
793	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
794	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
795	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
796	// when we receive a ping.	1041	// when we receive a ping.
797	if (!ictx)	1042	if (!ictx)
798	{	1043	{
799	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
800	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
801	}	1046	}
802	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
803	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
804		1051
805	break;	1052	break;
806		1053
807	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
808	break;	1060	break;
809		1061
810	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
811	{	1063	{
812	reset_connection ();	1064	reset_connection ();
813		1065
814	config_packet p = (config_packet ) pkt;	1066	config_packet p = (config_packet ) pkt;
815		1067
816	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
817	{
818	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
819	conf->nodename, (const char *)rsi);
820	connectmode = conf_node::C_DISABLED;
821	}
822	else if (connectmode == conf_node::C_ALWAYS)
823	establish_connection ();	1069	establish_connection ();
824	}	1070	}
825	break;	1071	break;
826		1072
827	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
828	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
829	{	1075	{
830	auth_req_packet p = (auth_req_packet ) pkt;	1076	auth_req_packet p = (auth_req_packet )pkt;
831		1077
832	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
833		1081
834	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
835	{	1088	{
836	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
837	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
838	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
839	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
840		1093
841	if (p->initiate)	1094	if (p->initiate)
842	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
843		1096
844	rsachallenge k;	1097	auth_data auth;
845		1098
846	if (0 > RSA_private_decrypt (sizeof (p->encr),	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
847	(unsigned char )&p->encr, (unsigned char )&k,	1100	{
848	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
849	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
850	conf->nodename, (const char *)rsi);	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
851	else	1104	else
852	{	1105	{
853	retry_cnt = 0;	1106	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
854	establish_connection.start (NOW + 8); //? ;)
855	keepalive.reset ();
856	rekey.reset ();
857		1107
858	delete ictx;
859	ictx = 0;	1108	rcv_auth = auth;
		1109	have_rcv_auth = true;
860		1110
861	delete octx;	1111	send_auth_response (rsi);
862		1112
863	octx = new crypto_ctx (k, 1);	1113	if (chg)
864	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1114	{
865
866	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
867	send_auth_response (rsi, p->id, k);	1116	features = p->features & config_packet::get_features ();
868		1117
		1118	connection_established (rsi);
869	break;	1119	}
870	}	1120	}
		1121
		1122	break;
871	}	1123	}
872		1124
873	send_reset (rsi);	1125	send_reset (rsi);
874	}	1126	}
875		1127
876	break;	1128	break;
877		1129
878	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
879	{	1131	{
880	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
881		1133
882	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
883		1135
884	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
885	{	1140	{
886	if (p->prot_minor != PROTOCOL_MINOR)
887	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
888	conf->nodename, (const char *)rsi,
889	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
890
891	rsachallenge chg;
892
893	if (!rsa_cache.find (p->id, chg))
894	slog (L_ERR, _("%s(%s): unrequested auth response"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
895	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
896	else
897	{
898	crypto_ctx *cctx = new crypto_ctx (chg, 0);
899
900	if (!p->hmac_chk (cctx))
901	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
902	"could be an attack, or just corruption or an synchronization error"),
903	conf->nodename, (const char *)rsi);
904	else
905	{
906	rsaresponse h;
907
908	rsa_hash (p->id, chg, h);
909
910	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
911	{
912	prot_minor = p->prot_minor;
913
914	delete ictx; ictx = cctx;
915
916	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
917
918	si = rsi;
919	protocol = rsi.prot;
920
921	rekey.start (NOW + ::conf.rekey);
922	keepalive.start (NOW + ::conf.keepalive);
923
924	// send queued packets
925	while (tap_packet *p = queue.get ())
926	{
927	send_data_packet (p);
928	delete p;
929	}
930
931	connectmode = conf->connectmode;
932
933	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
934	conf->nodename, (const char *)rsi,
935	p->prot_major, p->prot_minor);
936
937	if (::conf.script_node_up)
938	run_script (run_script_cb (this, &connection::script_node_up), false);
939
940	break;
941	}
942	else
943	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
944	conf->nodename, (const char *)rsi);
945	}
946
947	delete cctx;
948	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1147
		1148	have_snd_auth = true;
		1149	connection_established (rsi);
949	}	1150	}
950	}	1151	}
951
952	send_reset (rsi);
953	break;	1152	break;
954		1153
955	case vpn_packet::PT_DATA_COMPRESSED:	1154	case vpn_packet::PT_DATA_COMPRESSED:
956	#if !ENABLE_COMPRESSION	1155	#if !ENABLE_COMPRESSION
957	send_reset (rsi);	1156	send_reset (rsi);
…		…
962		1161
963	if (ictx && octx)	1162	if (ictx && octx)
964	{	1163	{
965	vpndata_packet p = (vpndata_packet )pkt;	1164	vpndata_packet p = (vpndata_packet )pkt;
966		1165
967	if (rsi == si)	1166	if (!p->hmac_chk (ictx))
		1167	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1168	"could be an attack, or just corruption or a synchronization error."),
		1169	conf->nodename, (const char *)rsi);
		1170	else
968	{	1171	{
969	if (!p->hmac_chk (ictx))
970	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
971	"could be an attack, or just corruption or an synchronization error"),
972	conf->nodename, (const char *)rsi);
973	else	1172	u32 seqno;
		1173	tap_packet *d = p->unpack (this, seqno);
		1174	int seqclass = iseqno.seqno_classify (seqno);
		1175
		1176	if (seqclass == 0) // ok
974	{	1177	{
975	u32 seqno;	1178	vpn->tap->send (d);
976	tap_packet *d = p->unpack (this, seqno);
977		1179
978	if (iseqno.recv_ok (seqno))	1180	if (si != rsi)
979	{	1181	{
980	vpn->tap->send (d);	1182	// fast re-sync on source address changes, useful especially for tcp/ip
		1183	//if (last_si_change < ev_now () + 5.)
		1184	// {
		1185	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1186	conf->nodename, (const char )si, (const char )rsi);
981		1187
982	if (p->dst () == 0) // re-broadcast	1188	si = rsi;
983	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1189
		1190	if (::conf.script_node_change)
984	{	1191	{
985	connection c = i;	1192	run_script_cb *cb = new run_script_cb;
986		1193	cb->set<connection, &connection::script_node_change> (this);
987	if (c->conf != THISNODE && c->conf != conf)	1194	run_script_queued (cb, _("node-change command execution failed, continuing."));
988	c->inject_data_packet (d);
989	}	1195	}
990		1196
		1197	// }
991	delete d;	1198	//else
992		1199	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
993	break;	1200	// conf->nodename, (const char )si, (const char )rsi);
994	}	1201	}
995	}	1202	}
		1203	else if (seqclass == 1) // far history
		1204	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1205	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1206	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1207	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1208	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1209	else if (seqclass == 3) // reset
		1210	{
		1211	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1212	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1213	send_reset (rsi);
		1214	}
		1215
		1216	delete d;
		1217	break;
996	}	1218	}
997	else
998	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
999	}	1219	}
1000		1220
1001	send_reset (rsi);	1221	send_reset (rsi);
1002	break;	1222	break;
1003		1223
1004	case vpn_packet::PT_CONNECT_REQ:	1224	case vpn_packet::PT_CONNECT_REQ:
1005	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1225	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1006	{	1226	{
1007	connect_req_packet p = (connect_req_packet ) pkt;	1227	connect_req_packet p = (connect_req_packet )pkt;
1008		1228
1009	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1229	if (p->id > 0 && p->id <= vpn->conns.size ())
1010	connection *c = vpn->conns[p->id - 1];
1011	conf->protocols = p->protocols;
1012
1013	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1014	conf->id, p->id, c->ictx && c->octx);
1015
1016	if (c->ictx && c->octx)
1017	{	1230	{
		1231	connection *c = vpn->conns[p->id - 1];
		1232	conf->protocols = p->protocols;
		1233
		1234	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1235	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1236	p->protocols,
		1237	c->ictx && c->octx);
		1238
		1239	if (c->ictx && c->octx)
		1240	{
1018	// send connect_info packets to both sides, in case one is	1241	// send connect_info packets to both sides, in case one is
1019	// behind a nat firewall (or both ;)	1242	// behind a nat firewall (or both ;)
1020	c->send_connect_info (conf->id, si, conf->protocols);	1243	c->send_connect_info (conf->id, si, conf->protocols);
1021	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1244	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1245	}
		1246	else
		1247	c->establish_connection ();
1022	}	1248	}
		1249	else
		1250	slog (L_WARN,
		1251	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1252	p->id);
1023	}	1253	}
1024		1254
1025	break;	1255	break;
1026		1256
1027	case vpn_packet::PT_CONNECT_INFO:	1257	case vpn_packet::PT_CONNECT_INFO:
1028	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1029	{	1259	{
1030	connect_info_packet p = (connect_info_packet ) pkt;	1260	connect_info_packet p = (connect_info_packet )pkt;
1031		1261
1032	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1033		1263	{
1034	connection *c = vpn->conns[p->id - 1];	1264	connection *c = vpn->conns[p->id - 1];
1035		1265
1036	c->conf->protocols = p->protocols;	1266	c->conf->protocols = p->protocols;
1037	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1267	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1038	p->si.upgrade_protocol (protocol, c->conf);	1268	p->si.upgrade_protocol (protocol, c->conf);
1039		1269
1040	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1270	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1041	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1271	conf->nodename,
		1272	vpn->conns[p->id - 1]->conf->nodename,
		1273	(const char *)p->si,
		1274	p->protocols,
		1275	protocol,
		1276	p->si.supported_protocols (c->conf),
		1277	!c->ictx && !c->octx);
1042		1278
1043	const sockinfo &dsi = forward_si (p->si);	1279	const sockinfo &dsi = forward_si (p->si);
1044		1280
1045	if (dsi.valid ())	1281	if (dsi.valid ())
1046	c->send_auth_request (dsi, true);	1282	c->send_auth_request (dsi, true);
		1283	else
		1284	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1285	vpn->conns[p->id - 1]->conf->nodename,
		1286	(const char *)p->si);
		1287	}
		1288	else
		1289	slog (L_WARN,
		1290	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1291	p->id);
1047	}	1292	}
1048		1293
1049	break;	1294	break;
1050		1295
1051	default:	1296	default:
1052	send_reset (rsi);	1297	send_reset (rsi);
1053	break;	1298	break;
1054	}	1299	}
1055	}	1300	}
1056		1301
1057	void connection::keepalive_cb (time_watcher &w)	1302	inline void
		1303	connection::keepalive_cb (ev::timer &w, int revents)
1058	{	1304	{
1059	if (NOW >= last_activity + ::conf.keepalive + 30)	1305	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1306
		1307	if (when >= 0)
		1308	w.start (when);
		1309	else if (when < -15)
1060	{	1310	{
1061	reset_connection ();	1311	reset_connection ();
1062	establish_connection ();	1312	establish_connection ();
1063	}	1313	}
1064	else if (NOW < last_activity + ::conf.keepalive)
1065	w.at = last_activity + ::conf.keepalive;
1066	else if (conf->connectmode != conf_node::C_ONDEMAND	1314	else if (conf->connectmode != conf_node::C_ONDEMAND
1067	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1315	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1068	{	1316	{
		1317	w.start (3);
1069	send_ping (si);	1318	send_ping (si);
1070	w.at = NOW + 5;
1071	}	1319	}
		1320	else if (when >= -10)
		1321	// hold ondemand connections implicitly a few seconds longer
		1322	// should delete octx, though, or something like that ;)
		1323	w.start (when + 10);
1072	else	1324	else
1073	reset_connection ();	1325	reset_connection ();
1074	}	1326	}
1075		1327
		1328	void
1076	void connection::connect_request (int id)	1329	connection::send_connect_request (int id)
1077	{	1330	{
1078	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1331	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1079		1332
1080	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1333	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1334	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1335	THISNODE->protocols);
1081	p->hmac_set (octx);	1336	p->hmac_set (octx);
1082	vpn->send_vpn_packet (p, si);	1337	send_vpn_packet (p, si);
1083		1338
1084	delete p;	1339	delete p;
1085	}	1340	}
1086		1341
1087	void connection::script_node ()	1342	void
		1343	connection::script_init_env (const char *ext)
1088	{	1344	{
1089	vpn->script_if_up ();
1090
1091	char *env;	1345	char *env;
		1346	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1347	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1348	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1349	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1350	conf->id & 0xff); putenv (env);
		1351	}
		1352
		1353	void
		1354	connection::script_init_connect_env ()
		1355	{
		1356	vpn->script_init_env ();
		1357
		1358	char *env;
1092	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1359	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1360	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1093	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1094	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1095	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1096	}	1364	}
1097		1365
		1366	inline const char *
1098	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1099	{	1368	{
1100	script_node ();	1369	script_init_connect_env ();
1101		1370
1102	putenv ("STATE=up");	1371	putenv ((char *)"STATE=up");
1103		1372
		1373	char *filename;
		1374	asprintf (&filename,
		1375	"%s/%s",
		1376	confbase,
1104	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1105	}
1106		1378
		1379	return filename;
		1380	}
		1381
		1382	inline const char *
		1383	connection::script_node_change ()
		1384	{
		1385	script_init_connect_env ();
		1386
		1387	putenv ((char *)"STATE=change");
		1388
		1389	char *filename;
		1390	asprintf (&filename,
		1391	"%s/%s",
		1392	confbase,
		1393	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1394
		1395	return filename;
		1396	}
		1397
		1398	inline const char *
1107	const char *connection::script_node_down ()	1399	connection::script_node_down ()
1108	{	1400	{
1109	script_node ();	1401	script_init_connect_env ();
1110		1402
1111	putenv ("STATE=down");	1403	putenv ((char *)"STATE=down");
1112		1404
1113	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1405	char *filename;
1114	}	1406	asprintf (&filename,
		1407	"%s/%s",
		1408	confbase,
		1409	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1115		1410
		1411	return filename;
		1412	}
		1413
1116	connection::connection(struct vpn *vpn_)	1414	connection::connection (struct vpn vpn, conf_node conf)
1117	: vpn(vpn_)	1415	: vpn(vpn), conf(conf),
1118	, rekey (this, &connection::rekey_cb)	1416	#if ENABLE_DNS
1119	, keepalive (this, &connection::keepalive_cb)	1417	dns (0),
		1418	#endif
		1419	data_queue(conf->max_ttl, conf->max_queue + 1),
		1420	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1421	{
		1422	rekey .set<connection, &connection::rekey_cb > (this);
		1423	keepalive .set<connection, &connection::keepalive_cb > (this);
1120	, establish_connection (this, &connection::establish_connection_cb)	1424	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1121	{	1425
		1426	last_establish_attempt = 0.;
1122	octx = ictx = 0;	1427	octx = ictx = 0;
1123	retry_cnt = 0;
1124		1428
1125	connectmode = conf_node::C_ALWAYS; // initial setting	1429	connectmode = conf->connectmode;
		1430
		1431	// queue a dummy packet to force an initial connection attempt
		1432	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1433	vpn_queue.put (new net_packet);
		1434
1126	reset_connection ();	1435	reset_connection ();
1127	}	1436	}
1128		1437
1129	connection::~connection ()	1438	connection::~connection ()
1130	{	1439	{
1131	shutdown ();	1440	shutdown ();
1132	}	1441	}
1133		1442
		1443	void
1134	void connection_init ()	1444	connection_init ()
1135	{	1445	{
1136	auth_rate_limiter.clear ();	1446	auth_rate_limiter.clear ();
1137	reset_rate_limiter.clear ();	1447	reset_rate_limiter.clear ();
1138	}	1448	}
1139		1449

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Comparing gvpe/src/connection.C (file contents): Revision 1.8 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.105 by root, Fri Jul 19 18:22:54 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.8 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.105 by root, Fri Jul 19 18:22:54 2013 UTC