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

Comparing gvpe/src/connection.C (file contents):
Revision 1.4 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.99 by root, Wed Jul 17 04:36:03 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
		54	#define ULTRA_FAST 1
		55	#define HLOG 15
		56	#include "lzf/lzf.h"
		57	#include "lzf/lzf_c.c"
		58	#include "lzf/lzf_d.c"
		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	//////////////////////////////////////////////////////////////////////////////
45		103
46	struct crypto_ctx	104	struct crypto_ctx
47	{	105	{
48	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	107	HMAC_CTX hctx;
50		108
51	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);
52	~crypto_ctx ();	110	~crypto_ctx ();
53	};	111	};
54		112
55	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)
56	{	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
57	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	147	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	148	}
62		149
63	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
64	{	151	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
67	}	154	}
68		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
		165	static inline bool
		166	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		167	{
		168	u8 rsa_decrypt[RSA_KEYLEN];
		169
		170	if (RSA_private_decrypt (sizeof (encr.rsa),
		171	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		172	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		173	return 0;
		174
		175	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		176
		177	return 1;
		178	}
		179
69	static void	180	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	181	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	182	{
72	EVP_MD_CTX ctx;	183	HMAC_CTX ctx;
73		184
74	EVP_MD_CTX_init (&ctx);	185	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	186	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	187	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	188	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	189	HMAC_CTX_cleanup (&ctx);
80	}	190	}
81		191
82	struct rsa_entry {	192	void
83	tstamp expire;	193	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	194	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	195	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	{ }	196	{
		197	// request data
		198	RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		199	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		200	auth_hash (snd_auth, snd_auth_mac);
131		201
132	} rsa_cache;	202	// eventual response data
133		203	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	{	204	}
140	w.at = NOW + RSA_TTL;
141		205
142	for (iterator i = begin (); i != end (); )	206	// every use prolongs the expiry
143	if (i->expire <= NOW)	207	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	208	}
149		209
150	//////////////////////////////////////////////////////////////////////////////	210	//////////////////////////////////////////////////////////////////////////////
151		211
152	void pkt_queue::put (tap_packet *p)	212	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		213	: max_ttl (max_ttl), max_queue (max_queue)
153	{	214	{
154	if (queue[i])	215	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		216
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;	217	i = 0;
182	j = 0;	218	j = 0;
		219
		220	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	221	}
184		222
185	pkt_queue::~pkt_queue ()	223	pkt_queue::~pkt_queue ()
186	{	224	{
187	for (i = QUEUEDEPTH; --i > 0; )	225	while (net_packet *p = get ())
		226	delete p;
		227
188	delete queue[i];	228	delete [] queue;
189	}	229	}
190		230
		231	void
		232	pkt_queue::expire_cb (ev::timer &w, int revents)
		233	{
		234	ev_tstamp expire = ev_now () - max_ttl;
		235
		236	for (;;)
		237	{
		238	if (empty ())
		239	break;
		240
		241	double diff = queue[j].tstamp - expire;
		242
		243	if (diff >= 0.)
		244	{
		245	w.start (diff > 0.5 ? diff : 0.5);
		246	break;
		247	}
		248
		249	delete get ();
		250	}
		251	}
		252
		253	void
		254	pkt_queue::put (net_packet *p)
		255	{
		256	ev_tstamp now = ev_now ();
		257
		258	// start expiry timer
		259	if (empty ())
		260	expire.start (max_ttl);
		261
		262	int ni = i + 1 == max_queue ? 0 : i + 1;
		263
		264	if (ni == j)
		265	delete get ();
		266
		267	queue[i].pkt = p;
		268	queue[i].tstamp = now;
		269
		270	i = ni;
		271	}
		272
		273	net_packet *
		274	pkt_queue::get ()
		275	{
		276	if (empty ())
		277	return 0;
		278
		279	net_packet *p = queue[j].pkt;
		280	queue[j].pkt = 0;
		281
		282	j = j + 1 == max_queue ? 0 : j + 1;
		283
		284	return p;
		285	}
		286
191	struct net_rateinfo {	287	struct net_rateinfo
		288	{
192	u32 host;	289	u32 host;
193	double pcnt, diff;	290	double pcnt, diff;
194	tstamp last;	291	tstamp last;
195	};	292	};
196		293
197	// only do action once every x seconds per host whole allowing bursts.	294	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	295	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	296	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	297	struct net_rate_limiter : list<net_rateinfo>
201	{	298	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	299	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	300	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	301	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		302	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		303
206	bool can (const sockinfo &si) { return can((u32)si.host); }	304	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	305	bool can (u32 host);
208	};	306	};
209		307
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	308	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		309
		310	bool
212	bool net_rate_limiter::can (u32 host)	311	net_rate_limiter::can (u32 host)
213	{	312	{
214	iterator i;	313	iterator i;
215		314
216	for (i = begin (); i != end (); )	315	for (i = begin (); i != end (); )
217	if (i->host == host)	316	if (i->host == host)
218	break;	317	break;
219	else if (i->last < NOW - EXPIRE)	318	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	319	i = erase (i);
221	else	320	else
222	i++;	321	i++;
223		322
224	if (i == end ())	323	if (i == end ())
225	{	324	{
226	net_rateinfo ri;	325	net_rateinfo ri;
227		326
228	ri.host = host;	327	ri.host = host;
229	ri.pcnt = 1.;	328	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	329	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	330	ri.last = ev_now ();
232		331
233	push_front (ri);	332	push_front (ri);
234		333
235	return true;	334	return true;
236	}	335	}
237	else	336	else
238	{	337	{
239	net_rateinfo ri (*i);	338	net_rateinfo ri (*i);
240	erase (i);	339	erase (i);
241		340
242	ri.pcnt = ri.pcnt * ALPHA;	341	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	342	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		343
245	ri.last = NOW;	344	ri.last = ev_now ();
246		345
		346	double dif = ri.diff / ri.pcnt;
		347
247	bool send = ri.diff / ri.pcnt > CUTOFF;	348	bool send = dif > NRL_CUTOFF;
248		349
		350	if (dif > NRL_MAXDIF)
		351	{
		352	ri.pcnt = 1.;
		353	ri.diff = NRL_MAXDIF;
		354	}
249	if (send)	355	else if (send)
250	ri.pcnt++;	356	ri.pcnt++;
251		357
252	push_front (ri);	358	push_front (ri);
253		359
254	return send;	360	return send;
257		363
258	/////////////////////////////////////////////////////////////////////////////	364	/////////////////////////////////////////////////////////////////////////////
259		365
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	366	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
261		367
		368	void
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	369	hmac_packet::hmac_gen (crypto_ctx *ctx)
263	{	370	{
264	unsigned int xlen;	371	unsigned int xlen;
265		372
266	HMAC_CTX *hctx = &ctx->hctx;	373	HMAC_CTX *hctx = &ctx->hctx;
267		374
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	375	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	376	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
270	len - sizeof (hmac_packet));	377	len - sizeof (hmac_packet)));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	378	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
272	}	379	}
273		380
274	void	381	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	383	{
…		…
285	hmac_gen (ctx);	392	hmac_gen (ctx);
286		393
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	395	}
289		396
		397	void
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	399	{
292	this->type = type;	400	type = type_;
293		401
294	int src = THISNODE->id;	402	int src = THISNODE->id;
295		403
296	src1 = src;	404	src1 = src;
297	srcdst = ((src >> 8) << 4) \| (dst >> 8);	405	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
299	}	407	}
300		408
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		411
304	struct vpndata_packet:vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		417	tap_packet unpack (connection conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
305	{	421	{
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;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	423	}
		424	};
317		425
318	void	426	void
319	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
320	{	428	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	430	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
324		432
325	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
327	u32 cl;
328		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
330	if (cl)	440	if (cl)
331	{	441	{
332	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
333	d = cdata;	443	d = cdata;
334	l = cl + 2;	444	l = cl + 2;
335		445
336	d[0] = cl >> 8;	446	d[0] = cl >> 8;
337	d[1] = cl;	447	d[1] = cl;
		448	}
338	}	449	}
339	#endif	450	#endif
340		451
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		453
343	struct {	454	struct {
344	#if RAND_SIZE	455	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
346	#endif	457	#endif
347	u32 seqno;	458	u32 seqno;
348	} datahdr;	459	} datahdr;
349		460
350	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	462	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
353	#endif	464	#endif
354		465
355	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	468	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	469	outl += outl2;
359		470
360	EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	472	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	473	(unsigned char *) d, l));
363	outl += outl2;	474	outl += outl2;
364		475
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	476	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	477	outl += outl2;
367		478
368	len = outl + data_hdr_size ();	479	len = outl + data_hdr_size ();
369		480
370	set_hdr (type, dst);	481	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	490	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	491	tap_packet *p = new tap_packet;
381	u8 *d;	492	u8 *d;
382	u32 l = len - data_hdr_size ();	493	u32 l = len - data_hdr_size ();
383		494
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	495	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		496
386	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
388		499
389	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
…		…
391	else	502	else
392	#endif	503	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6 - DATAHDR];
394		505
395	/* this overwrites part of the src mac, but we fix that later */	506	/* this overwrites part of the src mac, but we fix that later */
396	EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	508	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	509	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	510	outl += outl2;
400		511
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	512	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	513	outl += outl2;
403		514
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	515	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		516
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	517	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	542	}
432	};	543	};
433		544
434	struct config_packet : vpn_packet	545	struct config_packet : vpn_packet
435	{	546	{
436	// actually, hmaclen cannot be checked because the hmac
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	548	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
442
443	const u8 curflags () const
444	{
445	return 0x80
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}
448		550
449	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
450	bool chk_config () const;	552	bool chk_config () const;
		553
		554	static u8 get_features ()
		555	{
		556	u8 f = 0;
		557	#if ENABLE_COMPRESSION
		558	f \|= FEATURE_COMPRESSION;
		559	#endif
		560	#if ENABLE_ROHC
		561	f \|= FEATURE_ROHC;
		562	#endif
		563	#if ENABLE_BRIDGING
		564	f \|= FEATURE_BRIDGING;
		565	#endif
		566	return f;
		567	}
451	};	568	};
452		569
		570	void
453	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
454	{	572	{
455	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	575	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	576	flags = 0;
459	flags = curflags ();	577	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		578
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	579	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	580	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		581	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		582
466	len = sizeof (*this) - sizeof (net_packet);	583	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	584	set_hdr (type, dst);
468	}	585	}
469		586
		587	bool
470	bool config_packet::chk_config () const	588	config_packet::chk_config () const
471	{	589	{
472	return prot_major == PROTOCOL_MAJOR	590	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	591	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	592	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	593	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
476	&& challengelen == sizeof (rsachallenge)
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	595	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	596	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
480	}	597	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		598	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		599	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		600	else
		601	return true;
481		602
		603	return false;
		604	}
		605
482	struct auth_req_packet : config_packet	606	struct auth_req_packet : config_packet // UNPROTECTED
483	{	607	{
484	char magic[8];	608	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	609	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	610	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	611	u8 pad2, pad3;
488	rsaid id;	612	auth_encr encr;
489	rsaencrdata encr;
490		613
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	614	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	615	{
493	config_packet::setup (PT_AUTH_REQ, dst);	616	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	617	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	618	initiate = !!initiate_;
496	protocols = protocols_;	619	protocols = protocols_;
497		620
498	len = sizeof (*this) - sizeof (net_packet);	621	len = sizeof (*this) - sizeof (net_packet);
499	}	622	}
500	};	623	};
501		624
502	struct auth_res_packet : config_packet	625	struct auth_res_packet : config_packet // UNPROTECTED
503	{	626	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	627	auth_response response;
508		628
509	auth_res_packet (int dst)	629	auth_res_packet (int dst)
510	{	630	{
511	config_packet::setup (PT_AUTH_RES, dst);	631	config_packet::setup (PT_AUTH_RES, dst);
512		632
…		…
546	};	666	};
547		667
548	/////////////////////////////////////////////////////////////////////////////	668	/////////////////////////////////////////////////////////////////////////////
549		669
550	void	670	void
		671	connection::connection_established (const sockinfo &rsi)
		672	{
		673	if (!have_snd_auth \|\| !have_rcv_auth)
		674	return;
		675
		676	si = rsi;
		677	protocol = rsi.prot;
		678
		679	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		680	conf->nodename, (const char *)rsi,
		681	is_direct ? "direct" : "forwarded",
		682	PROTOCOL_MAJOR, prot_minor);
		683
		684	if (::conf.script_node_up)
		685	{
		686	run_script_cb *cb = new run_script_cb;
		687	cb->set<connection, &connection::script_node_up> (this);
		688	run_script_queued (cb, _("node-up command execution failed, continuing."));
		689	}
		690
		691	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		692	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		693
		694	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		695	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		696
		697	if (ictx && octx)
		698	{
		699	// make sure rekeying timeouts are slightly asymmetric
		700	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		701	rekey.start (rekey_interval, rekey_interval);
		702
		703	keepalive.start (::conf.keepalive);
		704
		705	// send queued packets
		706	if (ictx && octx)
		707	{
		708	while (tap_packet p = (tap_packet )data_queue.get ())
		709	{
		710	if (p->len) send_data_packet (p);
		711	delete p;
		712	}
		713
		714	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		715	{
		716	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		717	delete p;
		718	}
		719	}
		720
		721	vpn->connection_established (this);
		722	}
		723	#if 0
		724	else
		725	{
		726	retry_cnt = 0;
		727	establish_connection.start (5);
		728	keepalive.stop ();
		729	rekey.stop ();
		730	}
		731	#endif
		732	}
		733
		734	void
551	connection::reset_dstaddr ()	735	connection::reset_si ()
552	{	736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		739	else
		740	{
		741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		742	protocol = 0;
		743	}
		744
553	si.set (conf);	745	si.set (conf, protocol);
		746
		747	is_direct = si.valid ();
		748	}
		749
		750	// ensure sockinfo is valid, forward if necessary
		751	const sockinfo &
		752	connection::forward_si (const sockinfo &si) const
		753	{
		754	if (!si.valid ())
		755	{
		756	connection *r = vpn->find_router_for (this);
		757
		758	if (r)
		759	{
		760	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		761	conf->nodename, r->conf->nodename);
		762	return r->si;
		763	}
		764	else
		765	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		766	conf->nodename);
		767	}
		768
		769	return si;
		770	}
		771
		772	void
		773	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		774	{
		775	if (!vpn->send_vpn_packet (pkt, si, tos))
		776	reset_connection ();
554	}	777	}
555		778
556	void	779	void
557	connection::send_ping (const sockinfo &si, u8 pong)	780	connection::send_ping (const sockinfo &si, u8 pong)
558	{	781	{
559	ping_packet *pkt = new ping_packet;	782	ping_packet *pkt = new ping_packet;
560		783
561	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	784	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		785
		786	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	787	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563		788
564	delete pkt;	789	delete pkt;
565	}	790	}
566		791
…		…
581	void	806	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)	807	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{	808	{
584	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	809	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585		810
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	811	generate_auth_data ();
		812	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
587		813
588	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591
592	if (protocol)
593	{
594	rsachallenge chg;
595
596	rsa_cache.gen (pkt->id, chg);
597
598	if (0 > RSA_public_encrypt (sizeof chg,
599	(unsigned char )&chg, (unsigned char )&pkt->encr,
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
601	fatal ("RSA_public_encrypt error");
602
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
604
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
606		816
607	delete pkt;	817	delete pkt;
608	}
609	else
610	; // silently fail
611	}	818	}
612		819
613	void	820	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	821	connection::send_auth_response (const sockinfo &si)
615	{	822	{
616	auth_res_packet *pkt = new auth_res_packet (conf->id);	823	auth_res_packet *pkt = new auth_res_packet (conf->id);
617		824
618	pkt->id = id;	825	auth_hash (rcv_auth, pkt->response.mac);
		826	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
619		827
620	rsa_hash (id, chg, pkt->response);
621
622	pkt->hmac_set (octx);
623
624	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	828	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
625
626	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
627		830
628	delete pkt;	831	delete pkt;
629	}	832	}
630		833
631	void	834	void
632	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
633	{	836	{
634	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
635	conf->id, rid, (const char *)rsi);	838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
636		840
637	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
638		842
639	r->hmac_set (octx);	843	r->hmac_set (octx);
640	send_vpn_packet (r, si);	844	send_vpn_packet (r, si);
641		845
642	delete r;	846	delete r;
643	}	847	}
644		848
645	void	849	inline void
646	connection::establish_connection_cb (time_watcher &w)	850	connection::establish_connection_cb (ev::timer &w, int revents)
647	{	851	{
648	if (ictx \|\| conf == THISNODE	852	if (!(ictx && octx)
		853	&& conf != THISNODE
649	\|\| connectmode == conf_node::C_NEVER	854	&& connectmode != conf_node::C_NEVER
650	\|\| connectmode == conf_node::C_DISABLED)	855	&& connectmode != conf_node::C_DISABLED
651	w.at = TSTAMP_CANCEL;	856	&& !w.is_active ())
652	else if (w.at <= NOW)
653	{	857	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
655		859	// and stop trying. should probably be handled by a per-connection expire handler.
656	if (retry_int < 3600 * 8)	860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
657	retry_cnt++;
658
659	w.at = NOW + retry_int;
660
661	if (conf->hostname)
662	{	861	{
663	reset_dstaddr ();	862	reset_connection ();
664	if (si.host && auth_rate_limiter.can (si))	863	return;
665	{
666	if (retry_cnt < 4)
667	send_auth_request (si, true);
668	else
669	send_ping (si, 0);
670	}	864	}
		865
		866	last_establish_attempt = ev_now ();
		867
		868	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		869	? (retry_cnt & 3) + 1
		870	: 1 << (retry_cnt >> 2));
		871
		872	reset_si ();
		873
		874	bool slow = si.prot & PROT_SLOW;
		875
		876	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		877	{
		878	/TODO/ /* start the timer so we don't recurse endlessly */
		879	w.start (1);
		880	vpn->send_connect_request (this);
671	}	881	}
672	else	882	else
673	vpn->connect_request (conf->id);	883	{
		884	if (si.valid ())
		885	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		886	conf->nodename, (const char *)si);
		887
		888	const sockinfo &dsi = forward_si (si);
		889
		890	slow = slow \|\| (dsi.prot & PROT_SLOW);
		891
		892	if (dsi.valid () && auth_rate_limiter.can (dsi))
		893	{
		894	if (retry_cnt < 4)
		895	send_auth_request (dsi, true);
		896	else
		897	send_ping (dsi, 0);
		898	}
		899	}
		900
		901	retry_int *= slow ? 8. : 0.9;
		902
		903	if (retry_int < conf->max_retry)
		904	retry_cnt++;
		905	else
		906	retry_int = conf->max_retry;
		907
		908	w.start (retry_int);
674	}	909	}
675	}	910	}
676		911
677	void	912	void
678	connection::reset_connection ()	913	connection::reset_connection ()
…		…
681	{	916	{
682	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
683	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
684		919
685	if (::conf.script_node_down)	920	if (::conf.script_node_down)
686	run_script (run_script_cb (this, &connection::script_node_down), false);	921	{
		922	run_script_cb *cb = new run_script_cb;
		923	cb->set<connection, &connection::script_node_down> (this);
		924	run_script_queued (cb, _("node-down command execution failed, continuing."));
		925	}
687	}	926	}
688		927
689	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
690	delete octx; octx = 0;	929	delete octx; octx = 0;
691		930
692	si.host= 0;	931	si.host = 0;
693		932
		933	have_snd_auth = false;
		934	have_rcv_auth = false;
		935	auth_expire = 0.;
		936
694	last_activity = 0;	937	last_activity = 0.;
		938	//last_si_change = 0.;
695	retry_cnt = 0;	939	retry_cnt = 0;
696		940
697	rekey.reset ();	941	rekey.stop ();
698	keepalive.reset ();	942	keepalive.stop ();
699	establish_connection.reset ();	943	establish_connection.stop ();
700	}	944	}
701		945
702	void	946	void
703	connection::shutdown ()	947	connection::shutdown ()
704	{	948	{
…		…
706	send_reset (si);	950	send_reset (si);
707		951
708	reset_connection ();	952	reset_connection ();
709	}	953	}
710		954
711	void	955	// poor-man's rekeying
712	connection::rekey_cb (time_watcher &w)	956	inline void
		957	connection::rekey_cb (ev::timer &w, int revents)
713	{	958	{
714	w.at = TSTAMP_CANCEL;
715
716	reset_connection ();	959	reset_connection ();
717	establish_connection ();	960	establish_connection ();
718	}	961	}
719		962
720	void	963	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	964	connection::send_data_packet (tap_packet *pkt)
722	{	965	{
723	vpndata_packet *p = new vpndata_packet;	966	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	967	int tos = 0;
725		968
726	if (conf->inherit_tos	969	// I am not hilarious about peeking into packets, but so be it.
727	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	970	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	971	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		972
731	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	973	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
732	send_vpn_packet (p, si, tos);	974	send_vpn_packet (p, si, tos);
733		975
734	delete p;	976	delete p;
735		977
736	if (oseqno > MAX_SEQNO)	978	if (oseqno > MAX_SEQNO)
737	rekey ();	979	rekey ();
738	}	980	}
739		981
740	void	982	void
		983	connection::post_inject_queue ()
		984	{
		985	// force a connection every now and when when packets are sent (max 1/s)
		986	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		987	establish_connection.stop ();
		988
		989	establish_connection ();
		990	}
		991
		992	void
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	993	connection::inject_data_packet (tap_packet *pkt)
742	{	994	{
743	if (ictx && octx)	995	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	996	send_data_packet (pkt);
745	else	997	else
746	{	998	{
747	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	999	data_queue.put (new tap_packet (*pkt));
		1000	post_inject_queue ();
		1001	}
		1002	}
749		1003
750	establish_connection ();	1004	void
		1005	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1006	{
		1007	if (ictx && octx)
		1008	send_vpn_packet (pkt, si, tos);
		1009	else
		1010	{
		1011	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		1012	post_inject_queue ();
751	}	1013	}
752	}	1014	}
753		1015
754	void	1016	void
755	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1017	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
756	{	1018	{
757	last_activity = NOW;	1019	last_activity = ev_now ();
758		1020
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1021	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1022	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1023
		1024	if (connectmode == conf_node::C_DISABLED)
		1025	return;
761		1026
762	switch (pkt->typ ())	1027	switch (pkt->typ ())
763	{	1028	{
764	case vpn_packet::PT_PING:	1029	case vpn_packet::PT_PING:
		1030	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1031
765	// we send pings instead of auth packets after some retries,	1032	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	1033	// so reset the retry counter and establish a connection
767	// when we receive a ping.	1034	// when we receive a ping.
768	if (!ictx)	1035	if (!ictx)
769	{	1036	{
770	if (auth_rate_limiter.can (rsi))	1037	if (auth_rate_limiter.can (rsi))
771	send_auth_request (rsi, true);	1038	send_auth_request (rsi, true);
772	}	1039	}
773	else	1040	else
		1041	// we would love to change the socket address here, but ping's aren't
		1042	// authenticated, so we best ignore it.
774	send_ping (rsi, 1); // pong	1043	send_ping (rsi, 1); // pong
775		1044
776	break;	1045	break;
777		1046
778	case vpn_packet::PT_PONG:	1047	case vpn_packet::PT_PONG:
		1048	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1049
		1050	// a PONG might mean that the other side doesn't really know
		1051	// about our desire for communication.
		1052	establish_connection ();
779	break;	1053	break;
780		1054
781	case vpn_packet::PT_RESET:	1055	case vpn_packet::PT_RESET:
782	{	1056	{
783	reset_connection ();	1057	reset_connection ();
784		1058
785	config_packet p = (config_packet ) pkt;	1059	config_packet p = (config_packet ) pkt;
786		1060
787	if (!p->chk_config ())	1061	if (!p->chk_config ())
788	{	1062	{
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1063	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
790	conf->nodename, (const char *)rsi);	1064	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;	1065	connectmode = conf_node::C_DISABLED;
792	}	1066	}
793	else if (connectmode == conf_node::C_ALWAYS)	1067	else if (connectmode == conf_node::C_ALWAYS)
794	establish_connection ();	1068	establish_connection ();
…		…
796	break;	1070	break;
797		1071
798	case vpn_packet::PT_AUTH_REQ:	1072	case vpn_packet::PT_AUTH_REQ:
799	if (auth_rate_limiter.can (rsi))	1073	if (auth_rate_limiter.can (rsi))
800	{	1074	{
801	auth_req_packet p = (auth_req_packet ) pkt;	1075	auth_req_packet p = (auth_req_packet )pkt;
802		1076
803	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1077	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1078	conf->nodename, p->initiate ? "initiate" : "reply",
		1079	p->protocols, p->features);
804		1080
805	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1081	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
806	{	1082	{
807	if (p->prot_minor != PROTOCOL_MINOR)	1083	if (p->prot_minor != PROTOCOL_MINOR)
808	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1084	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
809	conf->nodename, (const char *)rsi,	1085	conf->nodename, (const char *)rsi,
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1086	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
811		1087
812	if (p->initiate)	1088	if (p->initiate)
813	send_auth_request (rsi, false);	1089	send_auth_request (rsi, false);
814		1090
815	rsachallenge k;	1091	auth_data auth;
816		1092
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	1093	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
818	(unsigned char )&p->encr, (unsigned char )&k,	1094	{
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1095	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
821	conf->nodename, (const char *)rsi);	1096	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1097	}
822	else	1098	else
823	{	1099	{
824	retry_cnt = 0;	1100	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
825	establish_connection.set (NOW + 8); //? ;)
826	keepalive.reset ();
827	rekey.reset ();
828		1101
829	delete ictx;
830	ictx = 0;	1102	rcv_auth = auth;
		1103	have_rcv_auth = true;
831		1104
832	delete octx;	1105	send_auth_response (rsi);
833		1106
834	octx = new crypto_ctx (k, 1);	1107	if (chg)
835	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1108	{
836
837	conf->protocols = p->protocols;	1109	conf->protocols = p->protocols;
838	send_auth_response (rsi, p->id, k);	1110	features = p->features & config_packet::get_features ();
839		1111
		1112	connection_established (rsi);
840	break;	1113	}
841	}	1114	}
		1115
		1116	break;
842	}	1117	}
		1118	else
		1119	slog (L_WARN, _("%s(%s): protocol mismatch."),
		1120	conf->nodename, (const char *)rsi);
843		1121
844	send_reset (rsi);	1122	send_reset (rsi);
845	}	1123	}
846		1124
847	break;	1125	break;
848		1126
849	case vpn_packet::PT_AUTH_RES:	1127	case vpn_packet::PT_AUTH_RES:
850	{	1128	{
851	auth_res_packet p = (auth_res_packet ) pkt;	1129	auth_res_packet p = (auth_res_packet )pkt;
852		1130
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1131	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
854		1132
855	if (p->chk_config ())	1133	if (p->chk_config ())
856	{	1134	{
857	if (p->prot_minor != PROTOCOL_MINOR)	1135	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
858	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
859	conf->nodename, (const char *)rsi,
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861
862	rsachallenge chg;
863
864	if (!rsa_cache.find (p->id, chg))
865	slog (L_ERR, _("%s(%s): unrequested auth response"),
866	conf->nodename, (const char *)rsi);
867	else
868	{	1136	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1137	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
870
871	if (!p->hmac_chk (cctx))
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),
874	conf->nodename, (const char *)rsi);	1138	conf->nodename, (const char *)rsi);
875	else
876	{
877	rsaresponse h;
878
879	rsa_hash (p->id, chg, h);
880
881	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
882	{
883	prot_minor = p->prot_minor;
884
885	delete ictx; ictx = cctx;
886
887	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888
889	si = rsi;
890
891	rekey.set (NOW + ::conf.rekey);
892	keepalive.set (NOW + ::conf.keepalive);
893
894	// send queued packets
895	while (tap_packet *p = queue.get ())
896	{
897	send_data_packet (p);
898	delete p;
899	}
900
901	connectmode = conf->connectmode;
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910
911	break;
912	}
913	else
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
915	conf->nodename, (const char *)rsi);
916	}
917
918	delete cctx;
919	}	1139	}
		1140	else if (!have_snd_auth)
		1141	{
		1142	if (p->prot_minor != PROTOCOL_MINOR)
		1143	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1144	conf->nodename, (const char *)rsi,
		1145	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1146
		1147	prot_minor = p->prot_minor;
		1148	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1149
		1150	have_snd_auth = true;
		1151	connection_established (rsi);
		1152	}
		1153
		1154	break;
920	}	1155	}
921	}	1156	}
922		1157
923	send_reset (rsi);	1158	send_reset (rsi);
924	break;	1159	break;
…		…
933		1168
934	if (ictx && octx)	1169	if (ictx && octx)
935	{	1170	{
936	vpndata_packet p = (vpndata_packet )pkt;	1171	vpndata_packet p = (vpndata_packet )pkt;
937		1172
938	if (rsi == si)	1173	if (!p->hmac_chk (ictx))
		1174	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1175	"could be an attack, or just corruption or a synchronization error."),
		1176	conf->nodename, (const char *)rsi);
		1177	else
939	{	1178	{
940	if (!p->hmac_chk (ictx))
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942	"could be an attack, or just corruption or an synchronization error"),
943	conf->nodename, (const char *)rsi);
944	else	1179	u32 seqno;
		1180	tap_packet *d = p->unpack (this, seqno);
		1181	int seqclass = iseqno.seqno_classify (seqno);
		1182
		1183	if (seqclass == 0) // ok
945	{	1184	{
946	u32 seqno;	1185	vpn->tap->send (d);
947	tap_packet *d = p->unpack (this, seqno);
948		1186
949	if (iseqno.recv_ok (seqno))	1187	if (si != rsi)
950	{	1188	{
951	vpn->tap->send (d);	1189	// fast re-sync on source address changes, useful especially for tcp/ip
		1190	//if (last_si_change < ev_now () + 5.)
		1191	// {
		1192	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1193	conf->nodename, (const char )si, (const char )rsi);
952		1194
953	if (p->dst () == 0) // re-broadcast	1195	si = rsi;
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1196
		1197	if (::conf.script_node_change)
955	{	1198	{
956	connection c = i;	1199	run_script_cb *cb = new run_script_cb;
957		1200	cb->set<connection, &connection::script_node_change> (this);
958	if (c->conf != THISNODE && c->conf != conf)	1201	run_script_queued (cb, _("node-change command execution failed, continuing."));
959	c->inject_data_packet (d);
960	}	1202	}
961		1203
		1204	// }
962	delete d;	1205	//else
963		1206	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
964	break;	1207	// conf->nodename, (const char )si, (const char )rsi);
965	}	1208	}
966	}	1209	}
		1210	else if (seqclass == 1) // far history
		1211	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1214	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 3) // reset
		1217	{
		1218	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1219	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1220	send_reset (rsi);
		1221	}
		1222
		1223	delete d;
		1224	break;
967	}	1225	}
968	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970	}	1226	}
971		1227
972	send_reset (rsi);	1228	send_reset (rsi);
973	break;	1229	break;
974		1230
975	case vpn_packet::PT_CONNECT_REQ:	1231	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1232	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1233	{
978	connect_req_packet p = (connect_req_packet ) pkt;	1234	connect_req_packet p = (connect_req_packet )pkt;
979		1235
980	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1236	if (p->id > 0 && p->id <= vpn->conns.size ())
981	conf->protocols = p->protocols;
982	connection *c = vpn->conns[p->id - 1];
983
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);
986
987	if (c->ictx && c->octx)
988	{	1237	{
		1238	connection *c = vpn->conns[p->id - 1];
		1239	conf->protocols = p->protocols;
		1240
		1241	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1242	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1243	p->protocols,
		1244	c->ictx && c->octx);
		1245
		1246	if (c->ictx && c->octx)
		1247	{
989	// send connect_info packets to both sides, in case one is	1248	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1249	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1250	c->send_connect_info (conf->id, si, conf->protocols);
992	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1251	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1252	}
		1253	else
		1254	c->establish_connection ();
993	}	1255	}
		1256	else
		1257	slog (L_WARN,
		1258	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1259	p->id);
994	}	1260	}
995		1261
996	break;	1262	break;
997		1263
998	case vpn_packet::PT_CONNECT_INFO:	1264	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1265	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1266	{
1001	connect_info_packet p = (connect_info_packet ) pkt;	1267	connect_info_packet p = (connect_info_packet )pkt;
1002		1268
1003	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1269	if (p->id > 0 && p->id <= vpn->conns.size ())
1004	conf->protocols = p->protocols;	1270	{
1005	connection *c = vpn->conns[p->id - 1];	1271	connection *c = vpn->conns[p->id - 1];
1006		1272
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1273	c->conf->protocols = p->protocols;
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1274	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1275	p->si.upgrade_protocol (protocol, c->conf);
1009		1276
		1277	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		1278	conf->nodename,
		1279	vpn->conns[p->id - 1]->conf->nodename,
		1280	(const char *)p->si,
		1281	p->protocols,
		1282	protocol,
		1283	p->si.supported_protocols (c->conf),
		1284	!c->ictx && !c->octx);
		1285
		1286	const sockinfo &dsi = forward_si (p->si);
		1287
		1288	if (dsi.valid ())
1010	c->send_auth_request (p->si, true);	1289	c->send_auth_request (dsi, true);
		1290	else
		1291	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si);
		1294	}
		1295	else
		1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
1011	}	1299	}
1012		1300
1013	break;	1301	break;
1014		1302
1015	default:	1303	default:
1016	send_reset (rsi);	1304	send_reset (rsi);
1017	break;	1305	break;
1018	}	1306	}
1019	}	1307	}
1020		1308
1021	void connection::keepalive_cb (time_watcher &w)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1022	{	1311	{
1023	if (NOW >= last_activity + ::conf.keepalive + 30)	1312	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1313
		1314	if (when >= 0)
		1315	w.start (when);
		1316	else if (when < -15)
1024	{	1317	{
1025	reset_connection ();	1318	reset_connection ();
1026	establish_connection ();	1319	establish_connection ();
1027	}	1320	}
1028	else if (NOW < last_activity + ::conf.keepalive)
1029	w.at = last_activity + ::conf.keepalive;
1030	else if (conf->connectmode != conf_node::C_ONDEMAND	1321	else if (conf->connectmode != conf_node::C_ONDEMAND
1031	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1322	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1032	{	1323	{
		1324	w.start (3);
1033	send_ping (si);	1325	send_ping (si);
1034	w.at = NOW + 5;
1035	}	1326	}
		1327	else if (when >= -10)
		1328	// hold ondemand connections implicitly a few seconds longer
		1329	// should delete octx, though, or something like that ;)
		1330	w.start (when + 10);
1036	else	1331	else
1037	reset_connection ();	1332	reset_connection ();
1038	}	1333	}
1039		1334
		1335	void
1040	void connection::connect_request (int id)	1336	connection::send_connect_request (int id)
1041	{	1337	{
1042	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1338	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1043		1339
1044	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1340	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1341	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1342	THISNODE->protocols);
1045	p->hmac_set (octx);	1343	p->hmac_set (octx);
1046	send_vpn_packet (p, si);	1344	send_vpn_packet (p, si);
1047		1345
1048	delete p;	1346	delete p;
1049	}	1347	}
1050		1348
1051	void connection::script_node ()	1349	void
		1350	connection::script_init_env (const char *ext)
1052	{	1351	{
1053	vpn->script_if_up ();
1054
1055	char *env;	1352	char *env;
		1353	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1354	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1355	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1356	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1357	conf->id & 0xff); putenv (env);
		1358	}
		1359
		1360	void
		1361	connection::script_init_connect_env ()
		1362	{
		1363	vpn->script_init_env ();
		1364
		1365	char *env;
1056	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1366	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1367	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1057	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1368	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1058	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1369	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1059	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1370	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1060	}	1371	}
1061		1372
		1373	inline const char *
1062	const char *connection::script_node_up ()	1374	connection::script_node_up ()
1063	{	1375	{
1064	script_node ();	1376	script_init_connect_env ();
1065		1377
1066	putenv ("STATE=up");	1378	putenv ((char *)"STATE=up");
1067		1379
		1380	char *filename;
		1381	asprintf (&filename,
		1382	"%s/%s",
		1383	confbase,
1068	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1384	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1069	}
1070		1385
		1386	return filename;
		1387	}
		1388
		1389	inline const char *
		1390	connection::script_node_change ()
		1391	{
		1392	script_init_connect_env ();
		1393
		1394	putenv ((char *)"STATE=change");
		1395
		1396	char *filename;
		1397	asprintf (&filename,
		1398	"%s/%s",
		1399	confbase,
		1400	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1401
		1402	return filename;
		1403	}
		1404
		1405	inline const char *
1071	const char *connection::script_node_down ()	1406	connection::script_node_down ()
1072	{	1407	{
1073	script_node ();	1408	script_init_connect_env ();
1074		1409
1075	putenv ("STATE=down");	1410	putenv ((char *)"STATE=down");
1076		1411
1077	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1412	char *filename;
1078	}	1413	asprintf (&filename,
		1414	"%s/%s",
		1415	confbase,
		1416	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1079		1417
1080	// send a vpn packet out to other hosts	1418	return filename;
1081	void
1082	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1083	{
1084	switch (protocol)
1085	{
1086	case PROT_IPv4:
1087	vpn->send_ipv4_packet (pkt, si, tos);
1088	break;
1089
1090	case PROT_UDPv4:
1091	vpn->send_udpv4_packet (pkt, si, tos);
1092	break;
1093
1094	case PROT_TCPv4:
1095	vpn->send_tcpv4_packet (pkt, si, tos);
1096	break;
1097	}
1098	}	1419	}
1099		1420
1100	connection::connection(struct vpn *vpn_)	1421	connection::connection (struct vpn vpn, conf_node conf)
1101	: vpn(vpn_)	1422	: vpn(vpn), conf(conf),
1102	, rekey (this, &connection::rekey_cb)	1423	#if ENABLE_DNS
1103	, keepalive (this, &connection::keepalive_cb)	1424	dns (0),
		1425	#endif
		1426	data_queue(conf->max_ttl, conf->max_queue + 1),
		1427	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1428	{
		1429	rekey .set<connection, &connection::rekey_cb > (this);
		1430	keepalive .set<connection, &connection::keepalive_cb > (this);
1104	, establish_connection (this, &connection::establish_connection_cb)	1431	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1105	{	1432
		1433	last_establish_attempt = 0.;
1106	octx = ictx = 0;	1434	octx = ictx = 0;
1107	retry_cnt = 0;
1108		1435
1109	connectmode = conf_node::C_ALWAYS; // initial setting	1436	connectmode = conf->connectmode;
		1437
		1438	// queue a dummy packet to force an initial connection attempt
		1439	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1440	vpn_queue.put (new net_packet);
		1441
1110	reset_connection ();	1442	reset_connection ();
1111	}	1443	}
1112		1444
1113	connection::~connection ()	1445	connection::~connection ()
1114	{	1446	{
1115	shutdown ();	1447	shutdown ();
1116	}	1448	}
1117		1449
		1450	void
1118	void connection_init ()	1451	connection_init ()
1119	{	1452	{
1120	auth_rate_limiter.clear ();	1453	auth_rate_limiter.clear ();
1121	reset_rate_limiter.clear ();	1454	reset_rate_limiter.clear ();
1122	}	1455	}
1123		1456

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Comparing gvpe/src/connection.C (file contents): Revision 1.4 by pcg, Wed Apr 2 21:02:25 2003 UTC vs. Revision 1.99 by root, Wed Jul 17 04:36:03 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.4 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.99 by root, Wed Jul 17 04:36:03 2013 UTC