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

Comparing gvpe/src/connection.C (file contents):
Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs.
Revision 1.102 by root, Thu Jul 18 13:35:16 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
73		186
74	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
80	}	192	}
81		193
82	struct rsa_entry {	194	void
83	tstamp expire;	195	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	196	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	197	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	{ }	198	{
		199	// request data
		200	rand_fill (snd_auth.rsa);
		201	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		202	auth_hash (snd_auth, snd_auth_mac);
131		203
132	} rsa_cache;	204	// eventual response data
133		205	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	{	206	}
140	w.at = NOW + RSA_TTL;
141		207
142	for (iterator i = begin (); i != end (); )	208	// every use prolongs the expiry
143	if (i->expire <= NOW)	209	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	210	}
149		211
150	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
151		213
152	void pkt_queue::put (tap_packet *p)	214	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		215	: max_ttl (max_ttl), max_queue (max_queue)
153	{	216	{
154	if (queue[i])	217	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		218
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;	219	i = 0;
182	j = 0;	220	j = 0;
		221
		222	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	223	}
184		224
185	pkt_queue::~pkt_queue ()	225	pkt_queue::~pkt_queue ()
186	{	226	{
187	for (i = QUEUEDEPTH; --i > 0; )	227	while (net_packet *p = get ())
		228	delete p;
		229
188	delete queue[i];	230	delete [] queue;
189	}	231	}
190		232
		233	void
		234	pkt_queue::expire_cb (ev::timer &w, int revents)
		235	{
		236	ev_tstamp expire = ev_now () - max_ttl;
		237
		238	for (;;)
		239	{
		240	if (empty ())
		241	break;
		242
		243	double diff = queue[j].tstamp - expire;
		244
		245	if (diff >= 0.)
		246	{
		247	w.start (diff > 0.5 ? diff : 0.5);
		248	break;
		249	}
		250
		251	delete get ();
		252	}
		253	}
		254
		255	void
		256	pkt_queue::put (net_packet *p)
		257	{
		258	ev_tstamp now = ev_now ();
		259
		260	// start expiry timer
		261	if (empty ())
		262	expire.start (max_ttl);
		263
		264	int ni = i + 1 == max_queue ? 0 : i + 1;
		265
		266	if (ni == j)
		267	delete get ();
		268
		269	queue[i].pkt = p;
		270	queue[i].tstamp = now;
		271
		272	i = ni;
		273	}
		274
		275	net_packet *
		276	pkt_queue::get ()
		277	{
		278	if (empty ())
		279	return 0;
		280
		281	net_packet *p = queue[j].pkt;
		282	queue[j].pkt = 0;
		283
		284	j = j + 1 == max_queue ? 0 : j + 1;
		285
		286	return p;
		287	}
		288
191	struct net_rateinfo {	289	struct net_rateinfo
		290	{
192	u32 host;	291	u32 host;
193	double pcnt, diff;	292	double pcnt, diff;
194	tstamp last;	293	tstamp last;
195	};	294	};
196		295
197	// only do action once every x seconds per host whole allowing bursts.	296	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	297	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	298	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	299	struct net_rate_limiter : list<net_rateinfo>
201	{	300	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	301	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	302	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	303	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		304	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		305
206	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	307	bool can (u32 host);
208	};	308	};
209		309
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		311
		312	bool
212	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
213	{	314	{
214	iterator i;	315	iterator i;
215		316
216	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
217	if (i->host == host)	318	if (i->host == host)
218	break;	319	break;
219	else if (i->last < NOW - EXPIRE)	320	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	321	i = erase (i);
221	else	322	else
222	i++;	323	i++;
223		324
224	if (i == end ())	325	if (i == end ())
225	{	326	{
226	net_rateinfo ri;	327	net_rateinfo ri;
227		328
228	ri.host = host;	329	ri.host = host;
229	ri.pcnt = 1.;	330	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	331	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	332	ri.last = ev_now ();
232		333
233	push_front (ri);	334	push_front (ri);
234		335
235	return true;	336	return true;
236	}	337	}
237	else	338	else
238	{	339	{
239	net_rateinfo ri (*i);	340	net_rateinfo ri (*i);
240	erase (i);	341	erase (i);
241		342
242	ri.pcnt = ri.pcnt * ALPHA;	343	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	344	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		345
245	ri.last = NOW;	346	ri.last = ev_now ();
246		347
		348	double dif = ri.diff / ri.pcnt;
		349
247	bool send = ri.diff / ri.pcnt > CUTOFF;	350	bool send = dif > NRL_CUTOFF;
248		351
		352	if (dif > NRL_MAXDIF)
		353	{
		354	ri.pcnt = 1.;
		355	ri.diff = NRL_MAXDIF;
		356	}
249	if (send)	357	else if (send)
250	ri.pcnt++;	358	ri.pcnt++;
251		359
252	push_front (ri);	360	push_front (ri);
253		361
254	return send;	362	return send;
257		365
258	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
259		367
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
261		369
		370	void
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
263	{	372	{
264	unsigned int xlen;	373	unsigned int xlen;
265		374
266	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
267		376
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
270	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
272	}	381	}
273		382
274	void	383	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	385	{
…		…
285	hmac_gen (ctx);	394	hmac_gen (ctx);
286		395
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	397	}
289		398
		399	void
290	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	401	{
292	type = type_;	402	type = type_;
293		403
294	int src = THISNODE->id;	404	int src = THISNODE->id;
295		405
…		…
299	}	409	}
300		410
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		413
304	struct vpndata_packet:vpn_packet	414	struct vpndata_packet : vpn_packet
		415	{
		416	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		417
		418	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		419	tap_packet unpack (connection conn, u32 &seqno);
		420
		421	private:
		422	const u32 data_hdr_size () const
305	{	423	{
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;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	425	}
		426	};
317		427
318	void	428	void
319	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	429	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
320	{	430	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	432	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
324		434
325	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
327	u32 cl;
328		437
		438	if (conn->features & FEATURE_COMPRESSION)
		439	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		441
330	if (cl)	442	if (cl)
331	{	443	{
332	type = PT_DATA_COMPRESSED;	444	type = PT_DATA_COMPRESSED;
333	d = cdata;	445	d = cdata;
334	l = cl + 2;	446	l = cl + 2;
335		447
336	d[0] = cl >> 8;	448	d[0] = cl >> 8;
337	d[1] = cl;	449	d[1] = cl;
		450	}
338	}	451	}
339	#endif	452	#endif
340		453
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		455
343	struct {	456	struct {
344	#if RAND_SIZE	457	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
346	#endif	459	#endif
347	u32 seqno;	460	u32 seqno;
348	} datahdr;	461	} datahdr;
349		462
350	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	464	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	465	// NB: a constant (per session) random prefix
		466	// is likely enough, but we don't take any chances.
		467	conn->oiv.get (datahdr.rnd, RAND_SIZE);
353	#endif	468	#endif
354		469
355	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	473	outl += outl2;
359		474
360	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	477	(unsigned char *) d, l));
363	outl += outl2;	478	outl += outl2;
364		479
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	481	outl += outl2;
367		482
368	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
369		484
370	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	494	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
381	u8 *d;	496	u8 *d;
382	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
383		498
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		500
386	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
388		503
389	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	505	d = cdata;
391	else	506	else
392	#endif	507	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
394		509
395	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 )(&p->len + 1) == &(p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	518	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	520	outl += outl2;
400		521
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	523	outl += outl2;
403		524
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	525	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		526
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	552	}
432	};	553	};
433		554
434	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
435	{	556	{
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;	557	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
442
443	const u8 curflags () const
444	{
445	return 0x80
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}
448		560
449	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
450	bool chk_config () const;	562	bool chk_config () const;
		563
		564	static u8 get_features ()
		565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f \|= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f \|= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f \|= FEATURE_BRIDGING;
		575	#endif
		576	return f;
		577	}
451	};	578	};
452		579
		580	void
453	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
454	{	582	{
455	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	586	flags = 0;
459	flags = curflags ();	587	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		588
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		591	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		592
466	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	594	set_hdr (type, dst);
468	}	595	}
469		596
		597	bool
470	bool config_packet::chk_config () const	598	config_packet::chk_config () const
471	{	599	{
472	return prot_major == PROTOCOL_MAJOR	600	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	601	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	602	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	603	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))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	605	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));	606	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
480	}	607	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		608	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		609	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		610	else
		611	return true;
481		612
		613	return false;
		614	}
		615
482	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
483	{	617	{
484	char magic[8];	618	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	621	u8 pad2, pad3;
488	rsaid id;	622	auth_encr encr;
489	rsaencrdata encr;
490		623
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	625	{
493	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	628	initiate = !!initiate_;
496	protocols = protocols_;	629	protocols = protocols_;
497		630
498	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
499	}	632	}
500	};	633	};
501		634
502	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
503	{	636	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	637	auth_response response;
508		638
509	auth_res_packet (int dst)	639	auth_res_packet (int dst)
510	{	640	{
511	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
512		642
…		…
546	};	676	};
547		677
548	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
549		679
550	void	680	void
		681	connection::connection_established (const sockinfo &rsi)
		682	{
		683	if (!have_snd_auth \|\| !have_rcv_auth)
		684	return;
		685
		686	si = rsi;
		687	protocol = rsi.prot;
		688
		689	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		690	conf->nodename, (const char *)rsi,
		691	is_direct ? "direct" : "forwarded",
		692	PROTOCOL_MAJOR, prot_minor);
		693
		694	if (::conf.script_node_up)
		695	{
		696	run_script_cb *cb = new run_script_cb;
		697	cb->set<connection, &connection::script_node_up> (this);
		698	run_script_queued (cb, _("node-up command execution failed, continuing."));
		699	}
		700
		701	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		702	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		703
		704	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		705	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		706
		707	oiv.reset ();
		708
		709	// make sure rekeying timeouts are slightly asymmetric
		710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		711	rekey.start (rekey_interval, rekey_interval);
		712
		713	keepalive.start (::conf.keepalive);
		714
		715	// send queued packets
		716	if (ictx && octx)
		717	{
		718	while (tap_packet p = (tap_packet )data_queue.get ())
		719	{
		720	if (p->len) send_data_packet (p);
		721	delete p;
		722	}
		723
		724	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		725	{
		726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		727	delete p;
		728	}
		729	}
		730
		731	vpn->connection_established (this);
		732	}
		733
		734	void
551	connection::reset_dstaddr ()	735	connection::reset_si ()
552	{	736	{
		737	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		739	else
555	// mask out protocols we cannot establish	740	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	742	protocol = 0;
		743	}
558		744
559	si.set (conf, protocol);	745	si.set (conf, protocol);
560	}
561		746
562	void	747	is_direct = si.valid ();
563	connection::send_ping (const sockinfo &si, u8 pong)
564	{
565	ping_packet *pkt = new ping_packet;
566
567	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
568	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
569
570	delete pkt;
571	}	748	}
572		749
573	void	750	// ensure sockinfo is valid, forward if necessary
		751	const sockinfo &
574	connection::send_reset (const sockinfo &si)	752	connection::forward_si (const sockinfo &si) const
575	{	753	{
576	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	754	if (!si.valid ())
577	{
578	config_packet *pkt = new config_packet;
579
580	pkt->setup (vpn_packet::PT_RESET, conf->id);
581	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);
582
583	delete pkt;
584	}	755	{
585	}	756	connection *r = vpn->find_router_for (this);
586		757
587	void	758	if (r)
588	connection::send_auth_request (const sockinfo &si, bool initiate)
589	{
590	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
591
592	rsachallenge chg;
593
594	rsa_cache.gen (pkt->id, chg);
595
596	if (0 > RSA_public_encrypt (sizeof chg,
597	(unsigned char )&chg, (unsigned char )&pkt->encr,
598	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
599	fatal ("RSA_public_encrypt error");
600
601	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
602
603	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
604
605	delete pkt;
606	}
607
608	void
609	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
610	{
611	auth_res_packet *pkt = new auth_res_packet (conf->id);
612
613	pkt->id = id;
614
615	rsa_hash (id, chg, pkt->response);
616
617	pkt->hmac_set (octx);
618
619	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
620
621	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
622
623	delete pkt;
624	}
625
626	void
627	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
628	{
629	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
630	conf->id, rid, (const char *)rsi);
631
632	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
633
634	r->hmac_set (octx);
635	vpn->send_vpn_packet (r, si);
636
637	delete r;
638	}
639
640	void
641	connection::establish_connection_cb (time_watcher &w)
642	{
643	if (ictx \|\| conf == THISNODE
644	\|\| connectmode == conf_node::C_NEVER
645	\|\| connectmode == conf_node::C_DISABLED)
646	w.at = TSTAMP_CANCEL;
647	else if (w.at <= NOW)
648	{
649	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
650
651	if (retry_int < 3600 * 8)
652	retry_cnt++;
653
654	w.at = NOW + retry_int;
655
656	if (conf->hostname)
657	{	759	{
658	reset_dstaddr ();	760	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659		761	conf->nodename, r->conf->nodename);
660	if (si.valid () && auth_rate_limiter.can (si))	762	return r->si;
661	{
662	if (retry_cnt < 4)
663	send_auth_request (si, true);
664	else
665	send_ping (si, 0);
666	}
667	}	763	}
668	else	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 ();
		777	}
		778
		779	void
		780	connection::send_ping (const sockinfo &si, u8 pong)
		781	{
		782	ping_packet *pkt = new ping_packet;
		783
		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);
		787	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		788
		789	delete pkt;
		790	}
		791
		792	void
		793	connection::send_reset (const sockinfo &si)
		794	{
		795	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		796	{
		797	config_packet *pkt = new config_packet;
		798
		799	pkt->setup (vpn_packet::PT_RESET, conf->id);
		800	send_vpn_packet (pkt, si, IPTOS_MINCOST);
		801
		802	delete pkt;
		803	}
		804	}
		805
		806	void
		807	connection::send_auth_request (const sockinfo &si, bool initiate)
		808	{
		809	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		810
		811	generate_auth_data ();
		812	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
		813
		814	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
		816
		817	delete pkt;
		818	}
		819
		820	void
		821	connection::send_auth_response (const sockinfo &si)
		822	{
		823	auth_res_packet *pkt = new auth_res_packet (conf->id);
		824
		825	auth_hash (rcv_auth, pkt->response.mac);
		826	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
		827
		828	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
		829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		830
		831	delete pkt;
		832	}
		833
		834	void
		835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
		836	{
		837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
		838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
		840
		841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
		842
		843	r->hmac_set (octx);
		844	send_vpn_packet (r, si);
		845
		846	delete r;
		847	}
		848
		849	inline void
		850	connection::establish_connection_cb (ev::timer &w, int revents)
		851	{
		852	if (!(ictx && octx)
		853	&& conf != THISNODE
		854	&& connectmode != conf_node::C_NEVER
		855	&& connectmode != conf_node::C_DISABLED
		856	&& !w.is_active ())
		857	{
		858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		859	// and stop trying. should probably be handled by a per-connection expire handler.
		860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		861	{
		862	reset_connection ();
		863	return;
		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);
669	vpn->connect_request (conf->id);	880	vpn->send_connect_request (this);
		881	}
		882	else
		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);
670	}	909	}
671	}	910	}
672		911
673	void	912	void
674	connection::reset_connection ()	913	connection::reset_connection ()
…		…
677	{	916	{
678	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
679	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
680		919
681	if (::conf.script_node_down)	920	if (::conf.script_node_down)
682	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	}
683	}	926	}
684		927
685	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
686	delete octx; octx = 0;	929	delete octx; octx = 0;
687		930
688	si.host= 0;	931	si.host = 0;
689		932
		933	have_snd_auth = false;
		934	have_rcv_auth = false;
		935	auth_expire = 0.;
		936
690	last_activity = 0;	937	last_activity = 0.;
		938	//last_si_change = 0.;
691	retry_cnt = 0;	939	retry_cnt = 0;
692		940
693	rekey.reset ();	941	rekey.stop ();
694	keepalive.reset ();	942	keepalive.stop ();
695	establish_connection.reset ();	943	establish_connection.stop ();
696	}	944	}
697		945
698	void	946	void
699	connection::shutdown ()	947	connection::shutdown ()
700	{	948	{
…		…
702	send_reset (si);	950	send_reset (si);
703		951
704	reset_connection ();	952	reset_connection ();
705	}	953	}
706		954
707	void	955	// poor-man's rekeying
708	connection::rekey_cb (time_watcher &w)	956	inline void
		957	connection::rekey_cb (ev::timer &w, int revents)
709	{	958	{
710	w.at = TSTAMP_CANCEL;
711
712	reset_connection ();	959	reset_connection ();
713	establish_connection ();	960	establish_connection ();
714	}	961	}
715		962
716	void	963	void
717	connection::send_data_packet (tap_packet *pkt, bool broadcast)	964	connection::send_data_packet (tap_packet *pkt)
718	{	965	{
719	vpndata_packet *p = new vpndata_packet;	966	vpndata_packet *p = new vpndata_packet;
720	int tos = 0;	967	int tos = 0;
721		968
722	if (conf->inherit_tos	969	// I am not hilarious about peeking into packets, but so be it.
723	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	970	if (conf->inherit_tos && pkt->is_ipv4 ())
724	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
725	tos = (*pkt)[15] & IPTOS_TOS_MASK;	971	tos = (*pkt)[15] & IPTOS_TOS_MASK;
726		972
727	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
728	vpn->send_vpn_packet (p, si, tos);	974	send_vpn_packet (p, si, tos);
729		975
730	delete p;	976	delete p;
731		977
732	if (oseqno > MAX_SEQNO)	978	if (oseqno > MAX_SEQNO)
733	rekey ();	979	rekey ();
734	}	980	}
735		981
736	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
737	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	993	connection::inject_data_packet (tap_packet *pkt)
738	{	994	{
739	if (ictx && octx)	995	if (ictx && octx)
740	send_data_packet (pkt, broadcast);	996	send_data_packet (pkt);
741	else	997	else
742	{	998	{
743	if (!broadcast)//DDDD
744	queue.put (new tap_packet (*pkt));	999	data_queue.put (new tap_packet (*pkt));
		1000	post_inject_queue ();
		1001	}
		1002	}
745		1003
746	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 ();
747	}	1013	}
748	}	1014	}
749		1015
750	void	1016	void
751	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1017	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
752	{	1018	{
753	last_activity = NOW;	1019	last_activity = ev_now ();
754		1020
755	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.",
756	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;
757		1026
758	switch (pkt->typ ())	1027	switch (pkt->typ ())
759	{	1028	{
760	case vpn_packet::PT_PING:	1029	case vpn_packet::PT_PING:
		1030	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1031
761	// we send pings instead of auth packets after some retries,	1032	// we send pings instead of auth packets after some retries,
762	// so reset the retry counter and establish a connection	1033	// so reset the retry counter and establish a connection
763	// when we receive a ping.	1034	// when we receive a ping.
764	if (!ictx)	1035	if (!ictx)
765	{	1036	{
766	if (auth_rate_limiter.can (rsi))	1037	if (auth_rate_limiter.can (rsi))
767	send_auth_request (rsi, true);	1038	send_auth_request (rsi, true);
768	}	1039	}
769	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.
770	send_ping (rsi, 1); // pong	1043	send_ping (rsi, 1); // pong
771		1044
772	break;	1045	break;
773		1046
774	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 ();
775	break;	1053	break;
776		1054
777	case vpn_packet::PT_RESET:	1055	case vpn_packet::PT_RESET:
778	{	1056	{
779	reset_connection ();	1057	reset_connection ();
780		1058
781	config_packet p = (config_packet ) pkt;	1059	config_packet p = (config_packet ) pkt;
782		1060
783	if (!p->chk_config ())	1061	if (!p->chk_config ())
784	{	1062	{
785	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1063	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
786	conf->nodename, (const char *)rsi);	1064	conf->nodename, (const char *)rsi);
787	connectmode = conf_node::C_DISABLED;	1065	connectmode = conf_node::C_DISABLED;
788	}	1066	}
789	else if (connectmode == conf_node::C_ALWAYS)	1067	else if (connectmode == conf_node::C_ALWAYS)
790	establish_connection ();	1068	establish_connection ();
…		…
792	break;	1070	break;
793		1071
794	case vpn_packet::PT_AUTH_REQ:	1072	case vpn_packet::PT_AUTH_REQ:
795	if (auth_rate_limiter.can (rsi))	1073	if (auth_rate_limiter.can (rsi))
796	{	1074	{
797	auth_req_packet p = (auth_req_packet ) pkt;	1075	auth_req_packet p = (auth_req_packet )pkt;
798		1076
799	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);
800		1080
801	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1081	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
802	{	1082	{
803	if (p->prot_minor != PROTOCOL_MINOR)	1083	if (p->prot_minor != PROTOCOL_MINOR)
804	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."),
805	conf->nodename, (const char *)rsi,	1085	conf->nodename, (const char *)rsi,
806	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1086	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
807		1087
808	if (p->initiate)	1088	if (p->initiate)
809	send_auth_request (rsi, false);	1089	send_auth_request (rsi, false);
810		1090
811	rsachallenge k;	1091	auth_data auth;
812		1092
813	if (0 > RSA_private_decrypt (sizeof (p->encr),	1093	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
814	(unsigned char )&p->encr, (unsigned char )&k,	1094	{
815	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
816	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?"),
817	conf->nodename, (const char *)rsi);	1096	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1097	}
818	else	1098	else
819	{	1099	{
820	retry_cnt = 0;	1100	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
821	establish_connection.start (NOW + 8); //? ;)
822	keepalive.reset ();
823	rekey.reset ();
824		1101
825	delete ictx;
826	ictx = 0;	1102	rcv_auth = auth;
		1103	have_rcv_auth = true;
827		1104
828	delete octx;	1105	send_auth_response (rsi);
829		1106
830	octx = new crypto_ctx (k, 1);	1107	if (chg)
831	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1108	{
832
833	conf->protocols = p->protocols;	1109	conf->protocols = p->protocols;
834	send_auth_response (rsi, p->id, k);	1110	features = p->features & config_packet::get_features ();
835		1111
		1112	connection_established (rsi);
836	break;	1113	}
837	}	1114	}
		1115
		1116	break;
838	}	1117	}
		1118	else
		1119	slog (L_WARN, _("%s(%s): protocol mismatch."),
		1120	conf->nodename, (const char *)rsi);
839		1121
840	send_reset (rsi);	1122	send_reset (rsi);
841	}	1123	}
842		1124
843	break;	1125	break;
844		1126
845	case vpn_packet::PT_AUTH_RES:	1127	case vpn_packet::PT_AUTH_RES:
846	{	1128	{
847	auth_res_packet p = (auth_res_packet ) pkt;	1129	auth_res_packet p = (auth_res_packet )pkt;
848		1130
849	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1131	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
850		1132
851	if (p->chk_config ())	1133	if (p->chk_config ())
852	{	1134	{
853	if (p->prot_minor != PROTOCOL_MINOR)	1135	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
854	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
855	conf->nodename, (const char *)rsi,
856	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
857
858	rsachallenge chg;
859
860	if (!rsa_cache.find (p->id, chg))
861	slog (L_ERR, _("%s(%s): unrequested auth response"),
862	conf->nodename, (const char *)rsi);
863	else
864	{	1136	{
865	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1137	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
866
867	if (!p->hmac_chk (cctx))
868	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
869	"could be an attack, or just corruption or an synchronization error"),
870	conf->nodename, (const char *)rsi);	1138	conf->nodename, (const char *)rsi);
871	else
872	{
873	rsaresponse h;
874
875	rsa_hash (p->id, chg, h);
876
877	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
878	{
879	prot_minor = p->prot_minor;
880
881	delete ictx; ictx = cctx;
882
883	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
884
885	si = rsi;
886	protocol = rsi.prot;
887
888	rekey.start (NOW + ::conf.rekey);
889	keepalive.start (NOW + ::conf.keepalive);
890
891	// send queued packets
892	while (tap_packet *p = queue.get ())
893	{
894	send_data_packet (p);
895	delete p;
896	}
897
898	connectmode = conf->connectmode;
899
900	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
901	conf->nodename, (const char *)rsi,
902	p->prot_major, p->prot_minor);
903
904	if (::conf.script_node_up)
905	run_script (run_script_cb (this, &connection::script_node_up), false);
906
907	break;
908	}
909	else
910	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
911	conf->nodename, (const char *)rsi);
912	}
913
914	delete cctx;
915	}	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;
916	}	1155	}
917	}	1156	}
918		1157
919	send_reset (rsi);	1158	send_reset (rsi);
920	break;	1159	break;
…		…
929		1168
930	if (ictx && octx)	1169	if (ictx && octx)
931	{	1170	{
932	vpndata_packet p = (vpndata_packet )pkt;	1171	vpndata_packet p = (vpndata_packet )pkt;
933		1172
934	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
935	{	1178	{
936	if (!p->hmac_chk (ictx))
937	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
938	"could be an attack, or just corruption or an synchronization error"),
939	conf->nodename, (const char *)rsi);
940	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
941	{	1184	{
942	u32 seqno;	1185	vpn->tap->send (d);
943	tap_packet *d = p->unpack (this, seqno);
944		1186
945	if (iseqno.recv_ok (seqno))	1187	if (si != rsi)
946	{	1188	{
947	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);
948		1194
949	if (p->dst () == 0) // re-broadcast	1195	si = rsi;
950	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1196
		1197	if (::conf.script_node_change)
951	{	1198	{
952	connection c = i;	1199	run_script_cb *cb = new run_script_cb;
953		1200	cb->set<connection, &connection::script_node_change> (this);
954	if (c->conf != THISNODE && c->conf != conf)	1201	run_script_queued (cb, _("node-change command execution failed, continuing."));
955	c->inject_data_packet (d);
956	}	1202	}
957		1203
		1204	// }
958	delete d;	1205	//else
959		1206	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
960	break;	1207	// conf->nodename, (const char )si, (const char )rsi);
961	}	1208	}
962	}	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;
963	}	1225	}
964	else
965	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
966	}	1226	}
967		1227
968	send_reset (rsi);	1228	send_reset (rsi);
969	break;	1229	break;
970		1230
971	case vpn_packet::PT_CONNECT_REQ:	1231	case vpn_packet::PT_CONNECT_REQ:
972	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1232	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
973	{	1233	{
974	connect_req_packet p = (connect_req_packet ) pkt;	1234	connect_req_packet p = (connect_req_packet )pkt;
975		1235
976	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 ())
977	connection *c = vpn->conns[p->id - 1];
978	conf->protocols = p->protocols;
979
980	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
981	conf->id, p->id, c->ictx && c->octx);
982
983	if (c->ictx && c->octx)
984	{	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	{
985	// send connect_info packets to both sides, in case one is	1248	// send connect_info packets to both sides, in case one is
986	// behind a nat firewall (or both ;)	1249	// behind a nat firewall (or both ;)
987	c->send_connect_info (conf->id, si, conf->protocols);	1250	c->send_connect_info (conf->id, si, conf->protocols);
988	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 ();
989	}	1255	}
		1256	else
		1257	slog (L_WARN,
		1258	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1259	p->id);
990	}	1260	}
991		1261
992	break;	1262	break;
993		1263
994	case vpn_packet::PT_CONNECT_INFO:	1264	case vpn_packet::PT_CONNECT_INFO:
995	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1265	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
996	{	1266	{
997	connect_info_packet p = (connect_info_packet ) pkt;	1267	connect_info_packet p = (connect_info_packet )pkt;
998		1268
999	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 ())
1000		1270	{
1001	connection *c = vpn->conns[p->id - 1];	1271	connection *c = vpn->conns[p->id - 1];
1002		1272
1003	c->conf->protocols = p->protocols;	1273	c->conf->protocols = p->protocols;
1004	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1274	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1005	p->si.upgrade_protocol (protocol, c->conf);	1275	p->si.upgrade_protocol (protocol, c->conf);
1006		1276
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1277	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1278	conf->nodename,
1009	//slog (L_ERR, "%d PROTOCL(C%x,T%x,0S%x,S%x,P%x,SP%x)",	1279	vpn->conns[p->id - 1]->conf->nodename,
1010	// p->id, c->conf->protocols, THISNODE->protocols, p->si.supported_protocols(0), p->si.supported_protocols (c->conf),	1280	(const char *)p->si,
1011	// protocol, p->si.prot);	1281	p->protocols,
		1282	protocol,
		1283	p->si.supported_protocols (c->conf),
		1284	!c->ictx && !c->octx);
1012		1285
		1286	const sockinfo &dsi = forward_si (p->si);
		1287
		1288	if (dsi.valid ())
1013	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);
1014	}	1299	}
1015		1300
1016	break;	1301	break;
1017		1302
1018	default:	1303	default:
1019	send_reset (rsi);	1304	send_reset (rsi);
1020	break;	1305	break;
1021	}	1306	}
1022	}	1307	}
1023		1308
1024	void connection::keepalive_cb (time_watcher &w)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1025	{	1311	{
1026	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)
1027	{	1317	{
1028	reset_connection ();	1318	reset_connection ();
1029	establish_connection ();	1319	establish_connection ();
1030	}	1320	}
1031	else if (NOW < last_activity + ::conf.keepalive)
1032	w.at = last_activity + ::conf.keepalive;
1033	else if (conf->connectmode != conf_node::C_ONDEMAND	1321	else if (conf->connectmode != conf_node::C_ONDEMAND
1034	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1322	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1035	{	1323	{
		1324	w.start (3);
1036	send_ping (si);	1325	send_ping (si);
1037	w.at = NOW + 5;
1038	}	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);
1039	else	1331	else
1040	reset_connection ();	1332	reset_connection ();
1041	}	1333	}
1042		1334
		1335	void
1043	void connection::connect_request (int id)	1336	connection::send_connect_request (int id)
1044	{	1337	{
1045	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);
1046		1339
1047	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);
1048	p->hmac_set (octx);	1343	p->hmac_set (octx);
1049	vpn->send_vpn_packet (p, si);	1344	send_vpn_packet (p, si);
1050		1345
1051	delete p;	1346	delete p;
1052	}	1347	}
1053		1348
1054	void connection::script_node ()	1349	void
		1350	connection::script_init_env (const char *ext)
1055	{	1351	{
1056	vpn->script_if_up ();
1057
1058	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;
1059	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);
1060	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1368	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1061	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1369	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1062	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1370	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1063	}	1371	}
1064		1372
		1373	inline const char *
1065	const char *connection::script_node_up ()	1374	connection::script_node_up ()
1066	{	1375	{
1067	script_node ();	1376	script_init_connect_env ();
1068		1377
1069	putenv ("STATE=up");	1378	putenv ((char *)"STATE=up");
1070		1379
		1380	char *filename;
		1381	asprintf (&filename,
		1382	"%s/%s",
		1383	confbase,
1071	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1384	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1072	}
1073		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 *
1074	const char *connection::script_node_down ()	1406	connection::script_node_down ()
1075	{	1407	{
1076	script_node ();	1408	script_init_connect_env ();
1077		1409
1078	putenv ("STATE=down");	1410	putenv ((char *)"STATE=down");
1079		1411
1080	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1412	char *filename;
1081	}	1413	asprintf (&filename,
		1414	"%s/%s",
		1415	confbase,
		1416	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1082		1417
		1418	return filename;
		1419	}
		1420
1083	connection::connection(struct vpn *vpn_)	1421	connection::connection (struct vpn vpn, conf_node conf)
1084	: vpn(vpn_)	1422	: vpn(vpn), conf(conf),
1085	, rekey (this, &connection::rekey_cb)	1423	#if ENABLE_DNS
1086	, 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);
1087	, establish_connection (this, &connection::establish_connection_cb)	1431	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1088	{	1432
		1433	last_establish_attempt = 0.;
1089	octx = ictx = 0;	1434	octx = ictx = 0;
1090	retry_cnt = 0;
1091		1435
1092	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
1093	reset_connection ();	1442	reset_connection ();
1094	}	1443	}
1095		1444
1096	connection::~connection ()	1445	connection::~connection ()
1097	{	1446	{
1098	shutdown ();	1447	shutdown ();
1099	}	1448	}
1100		1449
		1450	void
1101	void connection_init ()	1451	connection_init ()
1102	{	1452	{
1103	auth_rate_limiter.clear ();	1453	auth_rate_limiter.clear ();
1104	reset_rate_limiter.clear ();	1454	reset_rate_limiter.clear ();
1105	}	1455	}
1106		1456

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Comparing gvpe/src/connection.C (file contents): Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs. Revision 1.102 by root, Thu Jul 18 13:35:16 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs.
Revision 1.102 by root, Thu Jul 18 13:35:16 2013 UTC