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

Comparing gvpe/src/connection.C (file contents):
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs.
Revision 1.100 by root, Wed Jul 17 05:34:17 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	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
6	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
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	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.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
30
31	#include "gettext.h"
32		42
33	#include "conf.h"	43	#include "conf.h"
34	#include "slog.h"	44	#include "slog.h"
35	#include "device.h"	45	#include "device.h"
36	#include "vpn.h"	46	#include "vpn.h"
37	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
38		49
39	#include "netcompat.h"	50	#include "netcompat.h"
40		51
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
46		53
47	#define ULTRA_FAST 1	54	#define ULTRA_FAST 1
48	#define HLOG 15	55	#define HLOG 15
49	#include "lzf/lzf.h"	56	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	57	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	58	#include "lzf/lzf_d.c"
52		59
		60	//////////////////////////////////////////////////////////////////////////////
		61
		62	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		63	static ev::child rs_child_ev;
		64
		65	namespace
		66	{
		67	void // c++ requires external linkage here, apparently :(
		68	rs_child_cb (ev::child &w, int revents)
		69	{
		70	w.stop ();
		71
		72	if (rs_queue.empty ())
		73	return;
		74
		75	pid_t pid = run_script (*rs_queue.front ().first, false);
		76	if (pid)
		77	{
		78	w.set (pid);
		79	w.start ();
		80	}
		81	else
		82	slog (L_WARN, rs_queue.front ().second);
		83
		84	delete rs_queue.front ().first;
		85	rs_queue.pop ();
		86	}
		87	};
		88
		89	// despite the fancy name, this is quite a hack
		90	static void
		91	run_script_queued (run_script_cb cb, const char warnmsg)
		92	{
		93	rs_queue.push (std::make_pair (cb, warnmsg));
		94
		95	if (!rs_child_ev.is_active ())
		96	{
		97	rs_child_ev.set<rs_child_cb> ();
		98	rs_child_ev ();
		99	}
		100	}
		101
		102	//////////////////////////////////////////////////////////////////////////////
		103
53	struct crypto_ctx	104	struct crypto_ctx
54	{	105	{
55	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	107	HMAC_CTX hctx;
57		108
58	crypto_ctx (const rsachallenge &challenge, int enc);	109	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	110	~crypto_ctx ();
60	};	111	};
61		112
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	113	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	114	{
		115	ecdh_key s;
		116
		117	curve25519_combine (a, b, s);
		118
		119	{
		120	u8 mac_key[MAC_KEYSIZE];
		121	static const unsigned char mac_info[] = "gvpe mac key";
		122
		123	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		124	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		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 (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
64	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	147	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	148	}
69		149
70	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
71	{	151	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
74	}	154	}
75		155
		156	static inline void
		157	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		158	{
		159	if (RSA_public_encrypt (sizeof (auth.rsa),
		160	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		161	key, RSA_PKCS1_OAEP_PADDING) < 0)
		162	fatal ("RSA_public_encrypt error");
		163
		164	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		165	}
		166
		167	static inline bool
		168	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		169	{
		170	u8 rsa_decrypt[RSA_KEYLEN];
		171
		172	if (RSA_private_decrypt (sizeof (encr.rsa),
		173	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		174	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		175	return 0;
		176
		177	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		178	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		179
		180	return 1;
		181	}
		182
76	static void	183	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	184	auth_hash (const auth_data &auth, auth_mac &mac)
78	{	185	{
79	EVP_MD_CTX ctx;	186	HMAC_CTX ctx;
80		187
81	EVP_MD_CTX_init (&ctx);	188	HMAC_CTX_init (&ctx);
82	require (EVP_DigestInit (&ctx, RSA_HASH));	189	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));	190	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	191	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
86	EVP_MD_CTX_cleanup (&ctx);	192	HMAC_CTX_cleanup (&ctx);
87	}	193	}
88		194
89	struct rsa_entry {	195	void
90	tstamp expire;	196	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	197	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	198	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	199	{
		200	// request data
		201	RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		202	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		203	auth_hash (snd_auth, snd_auth_mac);
138		204
139	} rsa_cache;	205	// eventual response data
140		206	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	207	}
145	w.start (NOW + RSA_TTL);
146		208
147	for (iterator i = begin (); i != end (); )	209	// every use prolongs the expiry
148	if (i->expire <= NOW)	210	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	211	}
154		212
155	//////////////////////////////////////////////////////////////////////////////	213	//////////////////////////////////////////////////////////////////////////////
156		214
157	void pkt_queue::put (net_packet *p)	215	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		216	: max_ttl (max_ttl), max_queue (max_queue)
158	{	217	{
159	if (queue[i])	218	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		219
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	220	i = 0;
187	j = 0;	221	j = 0;
		222
		223	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	224	}
189		225
190	pkt_queue::~pkt_queue ()	226	pkt_queue::~pkt_queue ()
191	{	227	{
192	for (i = QUEUEDEPTH; --i > 0; )	228	while (net_packet *p = get ())
		229	delete p;
		230
193	delete queue[i];	231	delete [] queue;
194	}	232	}
195		233
		234	void
		235	pkt_queue::expire_cb (ev::timer &w, int revents)
		236	{
		237	ev_tstamp expire = ev_now () - max_ttl;
		238
		239	for (;;)
		240	{
		241	if (empty ())
		242	break;
		243
		244	double diff = queue[j].tstamp - expire;
		245
		246	if (diff >= 0.)
		247	{
		248	w.start (diff > 0.5 ? diff : 0.5);
		249	break;
		250	}
		251
		252	delete get ();
		253	}
		254	}
		255
		256	void
		257	pkt_queue::put (net_packet *p)
		258	{
		259	ev_tstamp now = ev_now ();
		260
		261	// start expiry timer
		262	if (empty ())
		263	expire.start (max_ttl);
		264
		265	int ni = i + 1 == max_queue ? 0 : i + 1;
		266
		267	if (ni == j)
		268	delete get ();
		269
		270	queue[i].pkt = p;
		271	queue[i].tstamp = now;
		272
		273	i = ni;
		274	}
		275
		276	net_packet *
		277	pkt_queue::get ()
		278	{
		279	if (empty ())
		280	return 0;
		281
		282	net_packet *p = queue[j].pkt;
		283	queue[j].pkt = 0;
		284
		285	j = j + 1 == max_queue ? 0 : j + 1;
		286
		287	return p;
		288	}
		289
196	struct net_rateinfo {	290	struct net_rateinfo
		291	{
197	u32 host;	292	u32 host;
198	double pcnt, diff;	293	double pcnt, diff;
199	tstamp last;	294	tstamp last;
200	};	295	};
201		296
211		306
212	bool can (const sockinfo &si) { return can((u32)si.host); }	307	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	308	bool can (u32 host);
214	};	309	};
215		310
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	311	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		312
		313	bool
218	bool net_rate_limiter::can (u32 host)	314	net_rate_limiter::can (u32 host)
219	{	315	{
220	iterator i;	316	iterator i;
221		317
222	for (i = begin (); i != end (); )	318	for (i = begin (); i != end (); )
223	if (i->host == host)	319	if (i->host == host)
224	break;	320	break;
225	else if (i->last < NOW - NRL_EXPIRE)	321	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	322	i = erase (i);
227	else	323	else
228	i++;	324	i++;
229		325
230	if (i == end ())	326	if (i == end ())
…		…
232	net_rateinfo ri;	328	net_rateinfo ri;
233		329
234	ri.host = host;	330	ri.host = host;
235	ri.pcnt = 1.;	331	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	332	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	333	ri.last = ev_now ();
238		334
239	push_front (ri);	335	push_front (ri);
240		336
241	return true;	337	return true;
242	}	338	}
…		…
244	{	340	{
245	net_rateinfo ri (*i);	341	net_rateinfo ri (*i);
246	erase (i);	342	erase (i);
247		343
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	344	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	345	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		346
251	ri.last = NOW;	347	ri.last = ev_now ();
252		348
253	double dif = ri.diff / ri.pcnt;	349	double dif = ri.diff / ri.pcnt;
254		350
255	bool send = dif > NRL_CUTOFF;	351	bool send = dif > NRL_CUTOFF;
256		352
…		…
270		366
271	/////////////////////////////////////////////////////////////////////////////	367	/////////////////////////////////////////////////////////////////////////////
272		368
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	369	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
274		370
		371	void
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx)
276	{	373	{
277	unsigned int xlen;	374	unsigned int xlen;
278		375
279	HMAC_CTX *hctx = &ctx->hctx;	376	HMAC_CTX *hctx = &ctx->hctx;
280		377
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	378	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	379	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
283	len - sizeof (hmac_packet));	380	len - sizeof (hmac_packet)));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	381	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
285	}	382	}
286		383
287	void	384	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	385	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	386	{
…		…
298	hmac_gen (ctx);	395	hmac_gen (ctx);
299		396
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	397	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	398	}
302		399
		400	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	401	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	402	{
305	type = type_;	403	type = type_;
306		404
307	int src = THISNODE->id;	405	int src = THISNODE->id;
308		406
…		…
313		411
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	412	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	413	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		414
317	struct vpndata_packet : vpn_packet	415	struct vpndata_packet : vpn_packet
		416	{
		417	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		418
		419	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		420	tap_packet unpack (connection conn, u32 &seqno);
		421
		422	private:
		423	const u32 data_hdr_size () const
318	{	424	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
322	tap_packet unpack (connection conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	425	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	426	}
		427	};
330		428
331	void	429	void
332	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	430	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
333	{	431	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	432	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	434	ptype type = PT_DATA_UNCOMPRESSED;
337		435
338	#if ENABLE_COMPRESSION	436	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	437	u8 cdata[MAX_MTU];
340		438
341	if (conn->features & ENABLE_COMPRESSION)	439	if (conn->features & FEATURE_COMPRESSION)
342	{	440	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	441	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		442
345	if (cl)	443	if (cl)
346	{	444	{
…		…
352	d[1] = cl;	450	d[1] = cl;
353	}	451	}
354	}	452	}
355	#endif	453	#endif
356		454
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	455	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		456
359	struct {	457	struct {
360	#if RAND_SIZE	458	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	459	u8 rnd[RAND_SIZE];
362	#endif	460	#endif
363	u32 seqno;	461	u32 seqno;
364	} datahdr;	462	} datahdr;
365		463
366	datahdr.seqno = ntohl (seqno);	464	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	465	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	466	RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
369	#endif	467	#endif
370		468
371	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	493	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
397	u8 *d;	495	u8 *d;
398	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
399		497
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		499
402	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
404		502
405	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
…		…
447	}	545	}
448	};	546	};
449		547
450	struct config_packet : vpn_packet	548	struct config_packet : vpn_packet
451	{	549	{
452	// actually, hmaclen cannot be checked because the hmac
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	550	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	551	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	552	u32 cipher_nid, mac_nid, auth_nid;
458		553
459	void setup (ptype type, int dst);	554	void setup (ptype type, int dst);
460	bool chk_config () const;	555	bool chk_config () const;
461		556
462	static u8 get_features ()	557	static u8 get_features ()
…		…
466	f \|= FEATURE_COMPRESSION;	561	f \|= FEATURE_COMPRESSION;
467	#endif	562	#endif
468	#if ENABLE_ROHC	563	#if ENABLE_ROHC
469	f \|= FEATURE_ROHC;	564	f \|= FEATURE_ROHC;
470	#endif	565	#endif
		566	#if ENABLE_BRIDGING
		567	f \|= FEATURE_BRIDGING;
		568	#endif
471	return f;	569	return f;
472	}	570	}
473	};	571	};
474		572
		573	void
475	void config_packet::setup (ptype type, int dst)	574	config_packet::setup (ptype type, int dst)
476	{	575	{
477	prot_major = PROTOCOL_MAJOR;	576	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	577	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	578	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	579	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	580	features = get_features ();
484		581
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	583	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		584	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		585
489	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	587	set_hdr (type, dst);
491	}	588	}
492		589
		590	bool
493	bool config_packet::chk_config () const	591	config_packet::chk_config () const
494	{	592	{
495	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	594	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	595	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	596	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499	else if (hmaclen != HMACLENGTH)
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	597	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	598	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	599	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	600	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		601	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		602	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	603	else
514	return true;	604	return true;
515		605
516	return false;	606	return false;
517	}	607	}
518		608
519	struct auth_req_packet : config_packet	609	struct auth_req_packet : config_packet // UNPROTECTED
520	{	610	{
521	char magic[8];	611	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	612	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	613	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	614	u8 pad2, pad3;
525	rsaid id;	615	auth_encr encr;
526	rsaencrdata encr;
527		616
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	617	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	618	{
530	config_packet::setup (PT_AUTH_REQ, dst);	619	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	620	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	621	initiate = !!initiate_;
533	protocols = protocols_;	622	protocols = protocols_;
534		623
535	len = sizeof (*this) - sizeof (net_packet);	624	len = sizeof (*this) - sizeof (net_packet);
536	}	625	}
537	};	626	};
538		627
539	struct auth_res_packet : config_packet	628	struct auth_res_packet : config_packet // UNPROTECTED
540	{	629	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	630	auth_response response;
545		631
546	auth_res_packet (int dst)	632	auth_res_packet (int dst)
547	{	633	{
548	config_packet::setup (PT_AUTH_RES, dst);	634	config_packet::setup (PT_AUTH_RES, dst);
549		635
…		…
583	};	669	};
584		670
585	/////////////////////////////////////////////////////////////////////////////	671	/////////////////////////////////////////////////////////////////////////////
586		672
587	void	673	void
588	connection::connection_established ()	674	connection::connection_established (const sockinfo &rsi)
589	{	675	{
		676	if (!have_snd_auth \|\| !have_rcv_auth)
		677	return;
		678
		679	si = rsi;
		680	protocol = rsi.prot;
		681
		682	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		683	conf->nodename, (const char *)rsi,
		684	is_direct ? "direct" : "forwarded",
		685	PROTOCOL_MAJOR, prot_minor);
		686
		687	if (::conf.script_node_up)
		688	{
		689	run_script_cb *cb = new run_script_cb;
		690	cb->set<connection, &connection::script_node_up> (this);
		691	run_script_queued (cb, _("node-up command execution failed, continuing."));
		692	}
		693
		694	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		695	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		696
		697	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		698	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		699
590	if (ictx && octx)	700	if (ictx && octx)
591	{	701	{
592	connectmode = conf->connectmode;
593
594	// make sure rekeying timeouts are slightly asymmetric	702	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey	703	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
596	+ (conf->id > THISNODE->id ? 10 : 0));	704	rekey.start (rekey_interval, rekey_interval);
		705
597	keepalive.start (NOW + ::conf.keepalive);	706	keepalive.start (::conf.keepalive);
598		707
599	// send queued packets	708	// send queued packets
600	if (ictx && octx)	709	if (ictx && octx)
601	{	710	{
602	while (tap_packet p = (tap_packet )data_queue.get ())	711	while (tap_packet p = (tap_packet )data_queue.get ())
603	{	712	{
604	send_data_packet (p);	713	if (p->len) send_data_packet (p);
605	delete p;	714	delete p;
606	}	715	}
607		716
608	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	717	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
609	{	718	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);	719	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;	720	delete p;
612	}	721	}
613	}	722	}
		723
		724	vpn->connection_established (this);
614	}	725	}
		726	#if 0
615	else	727	else
616	{	728	{
617	retry_cnt = 0;	729	retry_cnt = 0;
618	establish_connection.start (NOW + 5);	730	establish_connection.start (5);
619	keepalive.stop ();	731	keepalive.stop ();
620	rekey.stop ();	732	rekey.stop ();
621	}	733	}
		734	#endif
622	}	735	}
623		736
624	void	737	void
625	connection::reset_si ()	738	connection::reset_si ()
626	{	739	{
		740	if (vpn->can_direct (THISNODE, conf))
627	protocol = best_protocol (THISNODE->protocols & conf->protocols);	741	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
628		742	else
629	// mask out protocols we cannot establish	743	{
630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	744	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	745	protocol = 0;
632	if (!conf->dns_port) protocol &= ~PROT_DNSv4;	746	}
633		747
634	si.set (conf, protocol);	748	si.set (conf, protocol);
		749
		750	is_direct = si.valid ();
635	}	751	}
636		752
637	// ensure sockinfo is valid, forward if necessary	753	// ensure sockinfo is valid, forward if necessary
638	const sockinfo &	754	const sockinfo &
639	connection::forward_si (const sockinfo &si) const	755	connection::forward_si (const sockinfo &si) const
640	{	756	{
641	if (!si.valid ())	757	if (!si.valid ())
642	{	758	{
643	connection *r = vpn->find_router ();	759	connection *r = vpn->find_router_for (this);
644		760
645	if (r)	761	if (r)
646	{	762	{
647	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	763	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
648	conf->nodename, r->conf->nodename);	764	conf->nodename, r->conf->nodename);
649	return r->si;	765	return r->si;
650	}	766	}
651	else	767	else
652	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	768	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
653	conf->nodename);	769	conf->nodename);
654	}	770	}
655		771
656	return si;	772	return si;
657	}	773	}
658		774
659	void	775	void
660	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	776	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
661	{	777	{
662	bool ok;	778	if (!vpn->send_vpn_packet (pkt, si, tos))
663
664	switch (si.prot)
665	{
666	case PROT_IPv4:
667	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
668	case PROT_UDPv4:
669	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
670	#if ENABLE_TCP
671	case PROT_TCPv4:
672	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
673	#endif
674	#if ENABLE_ICMP
675	case PROT_ICMPv4:
676	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
677	#endif
678	#if ENABLE_DNS
679	case PROT_DNSv4:
680	ok = send_dnsv4_packet (pkt, si, tos); break;
681	#endif
682
683	default:
684	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
685	ok = false;
686	}
687
688	if (!ok)
689	reset_connection ();	779	reset_connection ();
690	}	780	}
691		781
692	void	782	void
693	connection::send_ping (const sockinfo &si, u8 pong)	783	connection::send_ping (const sockinfo &si, u8 pong)
694	{	784	{
695	ping_packet *pkt = new ping_packet;	785	ping_packet *pkt = new ping_packet;
696		786
697	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	787	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		788
		789	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
698	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	790	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
699		791
700	delete pkt;	792	delete pkt;
701	}	793	}
702		794
…		…
717	void	809	void
718	connection::send_auth_request (const sockinfo &si, bool initiate)	810	connection::send_auth_request (const sockinfo &si, bool initiate)
719	{	811	{
720	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	812	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
721		813
722	rsachallenge chg;	814	generate_auth_data ();
723	rsa_cache.gen (pkt->id, chg);
724	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	815	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
725		816
726	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	817	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
727
728	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	818	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
729		819
730	delete pkt;	820	delete pkt;
731	}	821	}
732		822
733	void	823	void
734	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	824	connection::send_auth_response (const sockinfo &si)
735	{	825	{
736	auth_res_packet *pkt = new auth_res_packet (conf->id);	826	auth_res_packet *pkt = new auth_res_packet (conf->id);
737		827
738	pkt->id = id;	828	auth_hash (rcv_auth, pkt->response.mac);
		829	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
739		830
740	rsa_hash (id, chg, pkt->response);
741
742	pkt->hmac_set (octx);
743
744	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	831	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
745
746	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	832	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
747		833
748	delete pkt;	834	delete pkt;
749	}	835	}
750		836
751	void	837	void
752	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	838	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
753	{	839	{
754	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	840	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
755	conf->id, rid, (const char *)rsi);	841	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		842	conf->protocols);
756		843
757	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	844	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
758		845
759	r->hmac_set (octx);	846	r->hmac_set (octx);
760	send_vpn_packet (r, si);	847	send_vpn_packet (r, si);
761		848
762	delete r;	849	delete r;
763	}	850	}
764		851
765	void	852	inline void
766	connection::establish_connection_cb (time_watcher &w)	853	connection::establish_connection_cb (ev::timer &w, int revents)
767	{	854	{
768	if (!ictx	855	if (!(ictx && octx)
769	&& conf != THISNODE	856	&& conf != THISNODE
770	&& connectmode != conf_node::C_NEVER	857	&& connectmode != conf_node::C_NEVER
771	&& connectmode != conf_node::C_DISABLED	858	&& connectmode != conf_node::C_DISABLED
772	&& NOW > w.at)	859	&& !w.is_active ())
773	{	860	{
774	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	861	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
775		862	// and stop trying. should probably be handled by a per-connection expire handler.
776	if (retry_int < conf->max_retry)	863	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		864	{
		865	reset_connection ();
777	retry_cnt++;	866	return;
778	else	867	}
779	retry_int = conf->max_retry;
780		868
781	w.start (NOW + retry_int);	869	last_establish_attempt = ev_now ();
		870
		871	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		872	? (retry_cnt & 3) + 1
		873	: 1 << (retry_cnt >> 2));
782		874
783	reset_si ();	875	reset_si ();
784		876
785	if (si.prot && !si.host)	877	bool slow = si.prot & PROT_SLOW;
		878
		879	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		880	{
		881	/TODO/ /* start the timer so we don't recurse endlessly */
		882	w.start (1);
786	vpn->send_connect_request (conf->id);	883	vpn->send_connect_request (this);
		884	}
787	else	885	else
788	{	886	{
		887	if (si.valid ())
		888	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		889	conf->nodename, (const char *)si);
		890
789	const sockinfo &dsi = forward_si (si);	891	const sockinfo &dsi = forward_si (si);
		892
		893	slow = slow \|\| (dsi.prot & PROT_SLOW);
790		894
791	if (dsi.valid () && auth_rate_limiter.can (dsi))	895	if (dsi.valid () && auth_rate_limiter.can (dsi))
792	{	896	{
793	if (retry_cnt < 4)	897	if (retry_cnt < 4)
794	send_auth_request (dsi, true);	898	send_auth_request (dsi, true);
795	else	899	else
796	send_ping (dsi, 0);	900	send_ping (dsi, 0);
797	}	901	}
798	}	902	}
		903
		904	retry_int *= slow ? 8. : 0.9;
		905
		906	if (retry_int < conf->max_retry)
		907	retry_cnt++;
		908	else
		909	retry_int = conf->max_retry;
		910
		911	w.start (retry_int);
799	}	912	}
800	}	913	}
801		914
802	void	915	void
803	connection::reset_connection ()	916	connection::reset_connection ()
…		…
806	{	919	{
807	slog (L_INFO, _("%s(%s): connection lost"),	920	slog (L_INFO, _("%s(%s): connection lost"),
808	conf->nodename, (const char *)si);	921	conf->nodename, (const char *)si);
809		922
810	if (::conf.script_node_down)	923	if (::conf.script_node_down)
811	run_script (run_script_cb (this, &connection::script_node_down), false);	924	{
		925	run_script_cb *cb = new run_script_cb;
		926	cb->set<connection, &connection::script_node_down> (this);
		927	run_script_queued (cb, _("node-down command execution failed, continuing."));
		928	}
812	}	929	}
813		930
814	delete ictx; ictx = 0;	931	delete ictx; ictx = 0;
815	delete octx; octx = 0;	932	delete octx; octx = 0;
816		933
817	si.host = 0;	934	si.host = 0;
818		935
		936	have_snd_auth = false;
		937	have_rcv_auth = false;
		938	auth_expire = 0.;
		939
819	last_activity = 0;	940	last_activity = 0.;
		941	//last_si_change = 0.;
820	retry_cnt = 0;	942	retry_cnt = 0;
821		943
822	rekey.stop ();	944	rekey.stop ();
823	keepalive.stop ();	945	keepalive.stop ();
824	establish_connection.stop ();	946	establish_connection.stop ();
…		…
831	send_reset (si);	953	send_reset (si);
832		954
833	reset_connection ();	955	reset_connection ();
834	}	956	}
835		957
836	void	958	// poor-man's rekeying
837	connection::rekey_cb (time_watcher &w)	959	inline void
		960	connection::rekey_cb (ev::timer &w, int revents)
838	{	961	{
839	reset_connection ();	962	reset_connection ();
840	establish_connection ();	963	establish_connection ();
841	}	964	}
842		965
…		…
858	if (oseqno > MAX_SEQNO)	981	if (oseqno > MAX_SEQNO)
859	rekey ();	982	rekey ();
860	}	983	}
861		984
862	void	985	void
		986	connection::post_inject_queue ()
		987	{
		988	// force a connection every now and when when packets are sent (max 1/s)
		989	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		990	establish_connection.stop ();
		991
		992	establish_connection ();
		993	}
		994
		995	void
863	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	996	connection::inject_data_packet (tap_packet *pkt)
864	{	997	{
865	if (ictx && octx)	998	if (ictx && octx)
866	send_data_packet (pkt);	999	send_data_packet (pkt);
867	else	1000	else
868	{	1001	{
869	if (!broadcast)//DDDD
870	data_queue.put (new tap_packet (*pkt));	1002	data_queue.put (new tap_packet (*pkt));
871		1003	post_inject_queue ();
872	establish_connection ();
873	}	1004	}
874	}	1005	}
875		1006
		1007	void
876	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1008	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
877	{	1009	{
878	if (ictx && octx)	1010	if (ictx && octx)
879	send_vpn_packet (pkt, si, tos);	1011	send_vpn_packet (pkt, si, tos);
880	else	1012	else
881	{	1013	{
882	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1014	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
883		1015	post_inject_queue ();
884	establish_connection ();
885	}	1016	}
886	}	1017	}
887		1018
888	void	1019	void
889	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1020	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
890	{	1021	{
891	last_activity = NOW;	1022	last_activity = ev_now ();
892		1023
893	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1024	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
894	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1025	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1026
		1027	if (connectmode == conf_node::C_DISABLED)
		1028	return;
895		1029
896	switch (pkt->typ ())	1030	switch (pkt->typ ())
897	{	1031	{
898	case vpn_packet::PT_PING:	1032	case vpn_packet::PT_PING:
		1033	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1034
899	// we send pings instead of auth packets after some retries,	1035	// we send pings instead of auth packets after some retries,
900	// so reset the retry counter and establish a connection	1036	// so reset the retry counter and establish a connection
901	// when we receive a ping.	1037	// when we receive a ping.
902	if (!ictx)	1038	if (!ictx)
903	{	1039	{
904	if (auth_rate_limiter.can (rsi))	1040	if (auth_rate_limiter.can (rsi))
905	send_auth_request (rsi, true);	1041	send_auth_request (rsi, true);
906	}	1042	}
907	else	1043	else
		1044	// we would love to change the socket address here, but ping's aren't
		1045	// authenticated, so we best ignore it.
908	send_ping (rsi, 1); // pong	1046	send_ping (rsi, 1); // pong
909		1047
910	break;	1048	break;
911		1049
912	case vpn_packet::PT_PONG:	1050	case vpn_packet::PT_PONG:
		1051	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1052
		1053	// a PONG might mean that the other side doesn't really know
		1054	// about our desire for communication.
		1055	establish_connection ();
913	break;	1056	break;
914		1057
915	case vpn_packet::PT_RESET:	1058	case vpn_packet::PT_RESET:
916	{	1059	{
917	reset_connection ();	1060	reset_connection ();
918		1061
919	config_packet p = (config_packet ) pkt;	1062	config_packet p = (config_packet ) pkt;
920		1063
921	if (!p->chk_config ())	1064	if (!p->chk_config ())
922	{	1065	{
923	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1066	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
924	conf->nodename, (const char *)rsi);	1067	conf->nodename, (const char *)rsi);
925	connectmode = conf_node::C_DISABLED;	1068	connectmode = conf_node::C_DISABLED;
926	}	1069	}
927	else if (connectmode == conf_node::C_ALWAYS)	1070	else if (connectmode == conf_node::C_ALWAYS)
928	establish_connection ();	1071	establish_connection ();
…		…
930	break;	1073	break;
931		1074
932	case vpn_packet::PT_AUTH_REQ:	1075	case vpn_packet::PT_AUTH_REQ:
933	if (auth_rate_limiter.can (rsi))	1076	if (auth_rate_limiter.can (rsi))
934	{	1077	{
935	auth_req_packet p = (auth_req_packet ) pkt;	1078	auth_req_packet p = (auth_req_packet )pkt;
936		1079
937	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1080	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1081	conf->nodename, p->initiate ? "initiate" : "reply",
		1082	p->protocols, p->features);
938		1083
939	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1084	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
940	{	1085	{
941	if (p->prot_minor != PROTOCOL_MINOR)	1086	if (p->prot_minor != PROTOCOL_MINOR)
942	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1087	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
943	conf->nodename, (const char *)rsi,	1088	conf->nodename, (const char *)rsi,
944	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1089	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
945		1090
946	if (p->initiate)	1091	if (p->initiate)
947	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
948		1093
949	rsachallenge k;	1094	auth_data auth;
950		1095
951	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1096	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
952	{	1097	{
953	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1098	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
954	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1099	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
955	break;
956	}	1100	}
957	else	1101	else
958	{	1102	{
959	delete octx;	1103	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
960		1104
961	octx = new crypto_ctx (k, 1);	1105	rcv_auth = auth;
962	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1106	have_rcv_auth = true;
963		1107
964	// compatibility code, remove when no longer required	1108	send_auth_response (rsi);
965	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
966		1109
		1110	if (chg)
		1111	{
967	conf->protocols = p->protocols;	1112	conf->protocols = p->protocols;
968	features = p->features & config_packet::get_features ();	1113	features = p->features & config_packet::get_features ();
969		1114
970	send_auth_response (rsi, p->id, k);
971
972	connection_established ();	1115	connection_established (rsi);
973
974	break;	1116	}
975	}	1117	}
		1118
		1119	break;
976	}	1120	}
977	else	1121	else
978	slog (L_WARN, _("%s(%s): protocol mismatch"),	1122	slog (L_WARN, _("%s(%s): protocol mismatch."),
979	conf->nodename, (const char *)rsi);	1123	conf->nodename, (const char *)rsi);
980		1124
981	send_reset (rsi);	1125	send_reset (rsi);
982	}	1126	}
983		1127
984	break;	1128	break;
985		1129
986	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
987	{	1131	{
988	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
989		1133
990	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
991		1135
992	if (p->chk_config ())	1136	if (p->chk_config ())
993	{	1137	{
994	if (p->prot_minor != PROTOCOL_MINOR)	1138	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
995	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
996	conf->nodename, (const char *)rsi,
997	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
998
999	rsachallenge chg;
1000
1001	if (!rsa_cache.find (p->id, chg))
1002	{	1139	{
1003	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1140	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1004	conf->nodename, (const char *)rsi);	1141	conf->nodename, (const char *)rsi);
1005	break;
1006	}	1142	}
1007	else	1143	else if (!have_snd_auth)
1008	{	1144	{
1009	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1145	if (p->prot_minor != PROTOCOL_MINOR)
1010		1146	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1011	if (!p->hmac_chk (cctx))
1012	{
1013	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1014	"could be an attack, or just corruption or a synchronization error"),
1015	conf->nodename, (const char *)rsi);	1147	conf->nodename, (const char *)rsi,
1016	break;	1148	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1017	}
1018	else
1019	{
1020	rsaresponse h;
1021		1149
1022	rsa_hash (p->id, chg, h);
1023
1024	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1025	{
1026	prot_minor = p->prot_minor;	1150	prot_minor = p->prot_minor;
		1151	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
1027		1152
1028	delete ictx; ictx = cctx;	1153	have_snd_auth = true;
1029
1030	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1031
1032	si = rsi;
1033	protocol = rsi.prot;
1034
1035	connection_established ();	1154	connection_established (rsi);
1036
1037	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1038	conf->nodename, (const char *)rsi,
1039	p->prot_major, p->prot_minor);
1040
1041	if (::conf.script_node_up)
1042	run_script (run_script_cb (this, &connection::script_node_up), false);
1043
1044	break;
1045	}
1046	else
1047	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1048	conf->nodename, (const char *)rsi);
1049	}
1050
1051	delete cctx;
1052	}	1155	}
		1156
		1157	break;
1053	}	1158	}
1054	}	1159	}
1055		1160
1056	send_reset (rsi);	1161	send_reset (rsi);
1057	break;	1162	break;
…		…
1068	{	1173	{
1069	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
1070		1175
1071	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1072	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1073	"could be an attack, or just corruption or a synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1074	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1075	else	1180	else
1076	{	1181	{
1077	u32 seqno;	1182	u32 seqno;
1078	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1079		1185
1080	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1081	{	1187	{
1082	vpn->tap->send (d);	1188	vpn->tap->send (d);
1083		1189
1084	if (si != rsi)	1190	if (si != rsi)
1085	{	1191	{
1086	// fast re-sync on connection changes, useful especially for tcp/ip	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
1087	si = rsi;	1194	// {
1088
1089	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1090	conf->nodename, (const char )si, (const char )rsi);	1196	conf->nodename, (const char )si, (const char )rsi);
		1197
		1198	si = rsi;
		1199
		1200	if (::conf.script_node_change)
		1201	{
		1202	run_script_cb *cb = new run_script_cb;
		1203	cb->set<connection, &connection::script_node_change> (this);
		1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1205	}
		1206
		1207	// }
		1208	//else
		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1210	// conf->nodename, (const char )si, (const char )rsi);
1091	}	1211	}
		1212	}
		1213	else if (seqclass == 1) // far history
		1214	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1217	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1218	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1219	else if (seqclass == 3) // reset
		1220	{
		1221	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1222	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1223	send_reset (rsi);
1092	}	1224	}
1093		1225
1094	delete d;	1226	delete d;
1095	break;	1227	break;
1096	}	1228	}
…		…
1100	break;	1232	break;
1101		1233
1102	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1103	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1104	{	1236	{
1105	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
1106		1238
1107	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1239	if (p->id > 0 && p->id <= vpn->conns.size ())
1108	connection *c = vpn->conns[p->id - 1];
1109	conf->protocols = p->protocols;
1110
1111	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1112	conf->id, p->id, c->ictx && c->octx);
1113
1114	if (c->ictx && c->octx)
1115	{	1240	{
		1241	connection *c = vpn->conns[p->id - 1];
		1242	conf->protocols = p->protocols;
		1243
		1244	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1245	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1246	p->protocols,
		1247	c->ictx && c->octx);
		1248
		1249	if (c->ictx && c->octx)
		1250	{
1116	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1117	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1118	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1119	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1254	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1255	}
		1256	else
		1257	c->establish_connection ();
1120	}	1258	}
1121	else	1259	else
1122	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1123	}	1263	}
1124		1264
1125	break;	1265	break;
1126		1266
1127	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1128	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1129	{	1269	{
1130	connect_info_packet p = (connect_info_packet )pkt;	1270	connect_info_packet p = (connect_info_packet )pkt;
1131		1271
1132	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1272	if (p->id > 0 && p->id <= vpn->conns.size ())
1133	{	1273	{
1134	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1135		1275
1136	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1137	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1138	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1139		1279
1140	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1280	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1141	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1281	conf->nodename,
		1282	vpn->conns[p->id - 1]->conf->nodename,
		1283	(const char *)p->si,
		1284	p->protocols,
		1285	protocol,
		1286	p->si.supported_protocols (c->conf),
		1287	!c->ictx && !c->octx);
1142		1288
1143	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1144		1290
1145	if (dsi.valid ())	1291	if (dsi.valid ())
1146	c->send_auth_request (dsi, true);	1292	c->send_auth_request (dsi, true);
		1293	else
		1294	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1295	vpn->conns[p->id - 1]->conf->nodename,
		1296	(const char *)p->si);
1147	}	1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1148	}	1302	}
1149		1303
1150	break;	1304	break;
1151		1305
1152	default:	1306	default:
1153	send_reset (rsi);	1307	send_reset (rsi);
1154	break;	1308	break;
1155	}	1309	}
1156	}	1310	}
1157		1311
1158	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1159	{	1314	{
1160	if (NOW >= last_activity + ::conf.keepalive + 30)	1315	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1316
		1317	if (when >= 0)
		1318	w.start (when);
		1319	else if (when < -15)
1161	{	1320	{
1162	reset_connection ();	1321	reset_connection ();
1163	establish_connection ();	1322	establish_connection ();
1164	}	1323	}
1165	else if (NOW < last_activity + ::conf.keepalive)
1166	w.start (last_activity + ::conf.keepalive);
1167	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1168	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1169	{	1326	{
		1327	w.start (3);
1170	send_ping (si);	1328	send_ping (si);
1171	w.start (NOW + 5);
1172	}	1329	}
1173	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1174	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1175	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1176	w.start (last_activity + ::conf.keepalive + 10);	1333	w.start (when + 10);
1177	else	1334	else
1178	reset_connection ();	1335	reset_connection ();
1179	}	1336	}
1180		1337
		1338	void
1181	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1182	{	1340	{
1183	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1341	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1184		1342
1185	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1343	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1344	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1345	THISNODE->protocols);
1186	p->hmac_set (octx);	1346	p->hmac_set (octx);
1187	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1188		1348
1189	delete p;	1349	delete p;
1190	}	1350	}
1191		1351
1192	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1193	{	1354	{
1194	vpn->script_if_up ();
1195
1196	char *env;	1355	char *env;
		1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1360	conf->id & 0xff); putenv (env);
		1361	}
		1362
		1363	void
		1364	connection::script_init_connect_env ()
		1365	{
		1366	vpn->script_init_env ();
		1367
		1368	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1369	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1370	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1374	}
1202		1375
		1376	inline const char *
1203	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1204	{	1378	{
1205	script_node ();	1379	script_init_connect_env ();
1206		1380
1207	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1208		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1209	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1210	}
1211		1388
		1389	return filename;
		1390	}
		1391
		1392	inline const char *
		1393	connection::script_node_change ()
		1394	{
		1395	script_init_connect_env ();
		1396
		1397	putenv ((char *)"STATE=change");
		1398
		1399	char *filename;
		1400	asprintf (&filename,
		1401	"%s/%s",
		1402	confbase,
		1403	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1404
		1405	return filename;
		1406	}
		1407
		1408	inline const char *
1212	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1213	{	1410	{
1214	script_node ();	1411	script_init_connect_env ();
1215		1412
1216	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1217		1414
1218	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
		1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1420
		1421	return filename;
1219	}	1422	}
1220		1423
1221	connection::connection (struct vpn vpn, conf_node conf)	1424	connection::connection (struct vpn vpn, conf_node conf)
1222	: vpn(vpn), conf(conf)	1425	: vpn(vpn), conf(conf),
1223	, rekey (this, &connection::rekey_cb)
1224	, keepalive (this, &connection::keepalive_cb)
1225	, establish_connection (this, &connection::establish_connection_cb)
1226	#if ENABLE_DNS	1426	#if ENABLE_DNS
1227	, dnsv4_tw (this, &connection::dnsv4_cb)	1427	dns (0),
1228	, dns_rcvdq (0), dns_snddq (0)
1229	, dns_rcvseq (0), dns_sndseq (0)
1230	#endif	1428	#endif
		1429	data_queue(conf->max_ttl, conf->max_queue + 1),
		1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1231	{	1431	{
		1432	rekey .set<connection, &connection::rekey_cb > (this);
		1433	keepalive .set<connection, &connection::keepalive_cb > (this);
		1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1435
		1436	last_establish_attempt = 0.;
1232	octx = ictx = 0;	1437	octx = ictx = 0;
1233	retry_cnt = 0;
1234		1438
1235	if (!conf->protocols) // make sure some protocol is enabled	1439	connectmode = conf->connectmode;
1236	conf->protocols = PROT_UDPv4;
1237		1440
1238	connectmode = conf_node::C_ALWAYS; // initial setting	1441	// queue a dummy packet to force an initial connection attempt
		1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1443	vpn_queue.put (new net_packet);
		1444
1239	reset_connection ();	1445	reset_connection ();
1240	}	1446	}
1241		1447
1242	connection::~connection ()	1448	connection::~connection ()
1243	{	1449	{
1244	shutdown ();	1450	shutdown ();
1245	}	1451	}
1246		1452
		1453	void
1247	void connection_init ()	1454	connection_init ()
1248	{	1455	{
1249	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1250	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1251	}	1458	}
1252		1459

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Comparing gvpe/src/connection.C (file contents): Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs. Revision 1.100 by root, Wed Jul 17 05:34:17 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs.
Revision 1.100 by root, Wed Jul 17 05:34:17 2013 UTC