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

Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.107 by root, Fri Sep 20 11:57:03 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 "gettext.h"	38	#include <openssl/opensslv.h>
		39	#include <openssl/rand.h>
		40	#include <openssl/evp.h>
		41	#include <openssl/rsa.h>
		42	#include <openssl/err.h>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
28		50
29	#include "conf.h"	51	#include "conf.h"
30	#include "slog.h"	52	#include "slog.h"
31	#include "device.h"	53	#include "device.h"
32	#include "protocol.h"	54	#include "vpn.h"
33	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
34		57
35	#if !HAVE_RAND_PSEUDO_BYTES	58	#include "netcompat.h"
36	# define RAND_pseudo_bytes RAND_bytes
37	#endif
38		59
39	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		62
		63	#define ULTRA_FAST 1
		64	#define HLOG 15
		65	#include "lzf/lzf.h"
		66	#include "lzf/lzf_c.c"
		67	#include "lzf/lzf_d.c"
		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb cb, const char warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
40		112
41	struct crypto_ctx	113	struct crypto_ctx
42	{	114	{
43	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
44	HMAC_CTX hctx;	116	HMAC_CTX hctx;
45		117
46	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
47	~crypto_ctx ();	119	~crypto_ctx ();
48	};	120	};
49		121
50	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
51	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
52	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
53	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
54	HMAC_CTX_init (&hctx);	154	}
55	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
56	}	155	}
57		156
58	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
59	{	158	{
60	EVP_CIPHER_CTX_cleanup (&cctx);	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
61	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
62	}	161	}
63		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
64	static void	190	static void
65	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
66	{	192	{
67	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
68		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
69	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
70	EVP_DigestInit (&ctx, RSA_HASH);	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
71	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
72	EVP_DigestUpdate(&ctx, &id, sizeof id);
73	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
74	EVP_MD_CTX_cleanup (&ctx);
75	}	197	}
76		198
77	struct rsa_entry {	199	void
78	tstamp expire;	200	connection::generate_auth_data ()
79	rsaid id;
80	rsachallenge chg;
81	};
82
83	struct rsa_cache : list<rsa_entry>
84	{	201	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	202	if (auth_expire < ev_now ())
86
87	bool find (const rsaid &id, rsachallenge &chg)
88	{
89	for (iterator i = begin (); i != end (); ++i)
90	{
91	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
92	{
93	memcpy (&chg, &i->chg, sizeof chg);
94
95	erase (i);
96	return true;
97	}
98	}
99
100	if (cleaner.at < NOW)
101	cleaner.start (NOW + RSA_TTL);
102
103	return false;
104	}
105
106	void gen (rsaid &id, rsachallenge &chg)
107	{
108	rsa_entry e;
109
110	RAND_bytes ((unsigned char *)&id, sizeof id);
111	RAND_bytes ((unsigned char *)&chg, sizeof chg);
112
113	e.expire = NOW + RSA_TTL;
114	e.id = id;
115	memcpy (&e.chg, &chg, sizeof chg);
116
117	push_back (e);
118
119	if (cleaner.at < NOW)
120	cleaner.start (NOW + RSA_TTL);
121	}
122
123	rsa_cache ()
124	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
126		207
127	} rsa_cache;	208	// eventual response data
128		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
129	void rsa_cache::cleaner_cb (tstamp &ts)
130	{
131	if (empty ())
132	ts = TSTAMP_CANCEL;
133	else
134	{	210	}
135	ts = NOW + RSA_TTL;
136		211
137	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
138	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
139	i = erase (i);
140	else
141	++i;
142	}
143	}	214	}
144		215
145	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
146		217
147	void pkt_queue::put (tap_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
148	{	220	{
149	if (queue[i])	221	queue = new pkt [max_queue];
150	{
151	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;
153	}
154		222
155	queue[i] = p;
156
157	i = (i + 1) % QUEUEDEPTH;
158	}
159
160	tap_packet *pkt_queue::get ()
161	{
162	tap_packet *p = queue[j];
163
164	if (p)
165	{
166	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;
168	}
169
170	return p;
171	}
172
173	pkt_queue::pkt_queue ()
174	{
175	memset (queue, 0, sizeof (queue));
176	i = 0;	223	i = 0;
177	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
178	}	227	}
179		228
180	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
181	{	230	{
182	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
183	delete queue[i];	234	delete [] queue;
184	}	235	}
185		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
		291	}
		292
186	struct net_rateinfo {	293	struct net_rateinfo
		294	{
187	u32 host;	295	u32 host;
188	double pcnt, diff;	296	double pcnt, diff;
189	tstamp last;	297	tstamp last;
190	};	298	};
191		299
192	// only do action once every x seconds per host whole allowing bursts.	300	// only do action once every x seconds per host whole allowing bursts.
193	// this implementation ("splay list" ;) is inefficient,	301	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	302	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	303	struct net_rate_limiter : list<net_rateinfo>
196	{	304	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	305	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	306	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
199	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	307	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		308	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
200		309
201	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	311	bool can (u32 host);
203	};	312	};
204		313
205	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206		315
		316	bool
207	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
208	{	318	{
209	iterator i;	319	iterator i;
210		320
211	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
212	if (i->host == host)	322	if (i->host == host)
213	break;	323	break;
214	else if (i->last < NOW - EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
215	i = erase (i);	325	i = erase (i);
216	else	326	else
217	i++;	327	i++;
218		328
219	if (i == end ())	329	if (i == end ())
220	{	330	{
221	net_rateinfo ri;	331	net_rateinfo ri;
222		332
223	ri.host = host;	333	ri.host = host;
224	ri.pcnt = 1.;	334	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	335	ri.diff = NRL_MAXDIF;
226	ri.last = NOW;	336	ri.last = ev_now ();
227		337
228	push_front (ri);	338	push_front (ri);
229		339
230	return true;	340	return true;
231	}	341	}
232	else	342	else
233	{	343	{
234	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
235	erase (i);	345	erase (i);
236		346
237	ri.pcnt = ri.pcnt * ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
239		349
240	ri.last = NOW;	350	ri.last = ev_now ();
241		351
		352	double dif = ri.diff / ri.pcnt;
		353
242	bool send = ri.diff / ri.pcnt > CUTOFF;	354	bool send = dif > NRL_CUTOFF;
243		355
		356	if (dif > NRL_MAXDIF)
		357	{
		358	ri.pcnt = 1.;
		359	ri.diff = NRL_MAXDIF;
		360	}
244	if (send)	361	else if (send)
245	ri.pcnt++;	362	ri.pcnt++;
246		363
247	push_front (ri);	364	push_front (ri);
248		365
249	return send;	366	return send;
250	}	367	}
251	}	368	}
252		369
253	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
254		371
255	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
256
257	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
258	{	374	{
259	unsigned int xlen;
260
261	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
262		376
263	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
264	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
265	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
266	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
267	}	380	}
268		381
269	void	382	void
270	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
271	{	384	{
272	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
273		386	hmac_gen (ctx, hmac_digest);
274	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
275	}	388	}
276		389
277	bool	390	bool
278	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
279	{	392	{
280	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
281		394	hmac_gen (ctx, hmac_digest);
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	396	}
284		397
		398	void
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	400	{
287	this->type = type;	401	type = type_;
288		402
289	int src = THISNODE->id;	403	int src = THISNODE->id;
290		404
291	src1 = src;	405	src1 = src;
292	srcdst = ((src >> 8) << 4) \| (dst >> 8);	406	srcdst = ((src >> 8) << 4) \| (dst >> 8);
294	}	408	}
295		409
296	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
297	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
298		412
299	struct vpndata_packet:vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		418	tap_packet unpack (connection conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
300	{	422	{
301	u8 data[MAXVPNDATA + DATAHDR]; // seqno
302
303	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
304	tap_packet unpack (connection conn, u32 &seqno);
305	private:
306
307	const u32 data_hdr_size () const
308	{
309	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
310	}
311	};	424	}
		425	};
312		426
313	void	427	void
314	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
315	{	429	{
316	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
317	int outl = 0, outl2;	431	int outl = 0, outl2;
318	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
319		433
320	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
321	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
322	u32 cl;
323		436
		437	if (conn->features & FEATURE_COMPRESSION)
		438	{
324	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		440
325	if (cl)	441	if (cl)
326	{	442	{
327	type = PT_DATA_COMPRESSED;	443	type = PT_DATA_COMPRESSED;
328	d = cdata;	444	d = cdata;
329	l = cl + 2;	445	l = cl + 2;
330		446
331	d[0] = cl >> 8;	447	d[0] = cl >> 8;
332	d[1] = cl;	448	d[1] = cl;
		449	}
333	}	450	}
334	#endif	451	#endif
335		452
336	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
337		454
338	struct {	455	struct {
339	#if RAND_SIZE	456	#if RAND_SIZE
340	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
341	#endif	458	#endif
342	u32 seqno;	459	u32 seqno;
343	} datahdr;	460	} datahdr;
344		461
345	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
346	#if RAND_SIZE	463	#if RAND_SIZE
347	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
348	#endif	467	#endif
349		468
350	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
351	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
352	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
353	outl += outl2;	472	outl += outl2;
354		473
355	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) d, l);	476	(unsigned char *) d, l));
358	outl += outl2;	477	outl += outl2;
359		478
360	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
361	outl += outl2;	480	outl += outl2;
362		481
363	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
364		483
365	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
374	int outl = 0, outl2;	493	int outl = 0, outl2;
375	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
376	u8 *d;	495	u8 *d;
377	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
378		497
379	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
380		499
381	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
382	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
383		502
384	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
385	d = cdata;	504	d = cdata;
386	else	505	else
387	#endif	506	#endif
388	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
389		508
390	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 )(&p->len + 1) == &(p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
391	EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
392	d, &outl2,	517	d, &outl2,
393	(unsigned char *)&data, len - data_hdr_size ());	518	(unsigned char *)&data, len - data_hdr_size ()));
394	outl += outl2;	519	outl += outl2;
395		520
396	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	521	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
397	outl += outl2;	522	outl += outl2;
398		523
399	seqno = ntohl ((u32 )(d + RAND_SIZE));	524	seqno = ntohl ((u32 )(d + RAND_SIZE));
400		525
401	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
426	}	551	}
427	};	552	};
428		553
429	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
430	{	555	{
431	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
432	// field comes before this data, so peers with other
433	// hmacs simply will not work.
434	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
435	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
436	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
437		560
438	const u8 curflags () const	561	void setup (ptype type, int dst);
		562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		563
		564	static u8 get_features ()
439	{	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
440	return 0x80	576	return f;
441	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
442	}	577	}
443
444	void setup (ptype type, int dst);
445	bool chk_config () const;
446	};	578	};
447		579
		580	void
448	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
449	{	582	{
450	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
451	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
452	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
453	hmaclen = HMACLENGTH;	586	flags = 0;
454	flags = curflags ();	587	features = get_features ();
455	challengelen = sizeof (rsachallenge);
456		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
457	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
458	digest_nid = htonl (EVP_MD_type (RSA_HASH));
459	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
460		594
461	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
462	set_hdr (type, dst);	596	set_hdr (type, dst);
463	}	597	}
464		598
465	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
466	{	601	{
467	return prot_major == PROTOCOL_MAJOR	602	if (prot_major != PROTOCOL_MAJOR)
468	&& randsize == RAND_SIZE	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
469	&& hmaclen == HMACLENGTH	604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
470	&& flags == curflags ()	605	else if (randsize != RAND_SIZE)
471	&& challengelen == sizeof (rsachallenge)	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
472	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
473	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
474	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
475	}	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
476		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
		625	return true;
		626	}
		627
		628	return false;
		629	}
		630
477	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
478	{	632	{
479	char magic[8];	633	char magic[8];
480	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
481	u8 protocols; // supported protocols (will get patches on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
482	u8 pad2, pad3;	636	u8 pad2, pad3;
483	rsaid id;	637	auth_encr encr;
484	rsaencrdata encr;
485		638
486	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
487	{	640	{
488	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
489	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
490	initiate = !!initiate_;	643	initiate = !!initiate_;
491	protocols = protocols_;	644	protocols = protocols_;
492		645
493	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
494	}	647	}
495	};	648	};
496		649
497	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
498	{	651	{
499	rsaid id;
500	u8 pad1, pad2, pad3;
501	u8 response_len; // encrypted length
502	rsaresponse response;	652	auth_response response;
503		653
504	auth_res_packet (int dst)	654	auth_res_packet (int dst)
505	{	655	{
506	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
507		657
508	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
509	}	659	}
510	};	660	};
511		661
…		…
541	};	691	};
542		692
543	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
544		694
545	void	695	void
		696	connection::connection_established (const sockinfo &rsi)
		697	{
		698	if (!have_snd_auth \|\| !have_rcv_auth)
		699	return;
		700
		701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	is_direct ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
		714	}
		715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		718
		719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
		724	// make sure rekeying timeouts are slightly asymmetric
		725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		726	rekey.start (rekey_interval, rekey_interval);
		727
		728	keepalive.start (::conf.keepalive);
		729
		730	// send queued packets
		731	if (ictx && octx)
		732	{
		733	while (tap_packet p = (tap_packet )data_queue.get ())
		734	{
		735	if (p->len) send_data_packet (p);
		736	delete p;
		737	}
		738
		739	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		740	{
		741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		742	delete p;
		743	}
		744	}
		745
		746	vpn->connection_established (this);
		747	}
		748
		749	void
546	connection::reset_dstaddr ()	750	connection::reset_si ()
547	{	751	{
		752	if (vpn->can_direct (THISNODE, conf))
		753	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		754	else
		755	{
		756	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		757	protocol = 0;
		758	}
		759
548	si.set (conf);	760	si.set (conf, protocol);
		761
		762	is_direct = si.valid ();
		763	}
		764
		765	// ensure sockinfo is valid, forward if necessary
		766	const sockinfo &
		767	connection::forward_si (const sockinfo &si) const
		768	{
		769	if (!si.valid ())
		770	{
		771	connection *r = vpn->find_router_for (this);
		772
		773	if (r)
		774	{
		775	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		776	conf->nodename, r->conf->nodename);
		777	return r->si;
		778	}
		779	else
		780	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		781	conf->nodename);
		782	}
		783
		784	return si;
		785	}
		786
		787	void
		788	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		789	{
		790	if (!vpn->send_vpn_packet (pkt, si, tos))
		791	reset_connection ();
549	}	792	}
550		793
551	void	794	void
552	connection::send_ping (const sockinfo &si, u8 pong)	795	connection::send_ping (const sockinfo &si, u8 pong)
553	{	796	{
554	ping_packet *pkt = new ping_packet;	797	ping_packet *pkt = new ping_packet;
555		798
556	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	799	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		800
		801	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
557	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	802	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
558		803
559	delete pkt;	804	delete pkt;
560	}	805	}
561		806
…		…
576	void	821	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	822	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	823	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	824	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580		825
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);	826	generate_auth_data ();
		827	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
582		828
583	rsachallenge chg;
584
585	rsa_cache.gen (pkt->id, chg);
586
587	if (0 > RSA_public_encrypt (sizeof chg,
588	(unsigned char )&chg, (unsigned char )&pkt->encr,
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");
591
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	829	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		830	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
593		831
		832	delete pkt;
		833	}
		834
		835	void
		836	connection::send_auth_response (const sockinfo &si)
		837	{
		838	auth_res_packet *pkt = new auth_res_packet (conf->id);
		839
		840	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		841	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
		842
		843	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	844	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
595		845
596	delete pkt;	846	delete pkt;
597	}	847	}
598		848
599	void	849	void
600	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
601	{
602	auth_res_packet *pkt = new auth_res_packet (conf->id);
603
604	pkt->id = id;
605
606	rsa_hash (id, chg, pkt->response);
607
608	pkt->hmac_set (octx);
609
610	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
611
612	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
613
614	delete pkt;
615	}
616
617	void
618	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	850	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
619	{	851	{
620	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	852	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
621	conf->id, rid, (const char *)rsi);	853	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		854	conf->protocols);
622		855
623	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	856	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
624		857
625	r->hmac_set (octx);	858	r->hmac_set (octx);
626	send_vpn_packet (r, si);	859	send_vpn_packet (r, si);
627		860
628	delete r;	861	delete r;
629	}	862	}
630		863
631	void	864	inline void
632	connection::establish_connection_cb (tstamp &ts)	865	connection::establish_connection_cb (ev::timer &w, int revents)
633	{	866	{
634	if (ictx \|\| conf == THISNODE	867	if (!(ictx && octx)
		868	&& conf != THISNODE
635	\|\| connectmode == conf_node::C_NEVER	869	&& connectmode != conf_node::C_NEVER
636	\|\| connectmode == conf_node::C_DISABLED)	870	&& connectmode != conf_node::C_DISABLED
637	ts = TSTAMP_CANCEL;	871	&& !w.is_active ())
638	else if (ts <= NOW)
639	{	872	{
640	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	873	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
641		874	// and stop trying. should probably be handled by a per-connection expire handler.
642	if (retry_int < 3600 * 8)	875	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
643	retry_cnt++;
644
645	ts = NOW + retry_int;
646
647	if (conf->hostname)
648	{	876	{
649	reset_dstaddr ();	877	reset_connection ();
650	if (si.host && auth_rate_limiter.can (si))	878	return;
651	{
652	if (retry_cnt < 4)
653	send_auth_request (si, true);
654	else
655	send_ping (si, 0);
656	}	879	}
		880
		881	last_establish_attempt = ev_now ();
		882
		883	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		884	? (retry_cnt & 3) + 1
		885	: 1 << (retry_cnt >> 2));
		886
		887	reset_si ();
		888
		889	bool slow = si.prot & PROT_SLOW;
		890
		891	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		892	{
		893	/TODO/ /* start the timer so we don't recurse endlessly */
		894	w.start (1);
		895	vpn->send_connect_request (this);
657	}	896	}
658	else	897	else
659	vpn->connect_request (conf->id);	898	{
		899	if (si.valid ())
		900	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		901	conf->nodename, (const char *)si);
		902
		903	const sockinfo &dsi = forward_si (si);
		904
		905	slow = slow \|\| (dsi.prot & PROT_SLOW);
		906
		907	if (dsi.valid () && auth_rate_limiter.can (dsi))
		908	{
		909	if (retry_cnt < 4)
		910	send_auth_request (dsi, true);
		911	else
		912	send_ping (dsi, 0);
		913	}
		914	}
		915
		916	retry_int *= slow ? 8. : 0.9;
		917
		918	if (retry_int < conf->max_retry)
		919	retry_cnt++;
		920	else
		921	retry_int = conf->max_retry;
		922
		923	w.start (retry_int);
660	}	924	}
661	}	925	}
662		926
663	void	927	void
664	connection::reset_connection ()	928	connection::reset_connection ()
…		…
667	{	931	{
668	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost"),
669	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si);
670		934
671	if (::conf.script_node_down)	935	if (::conf.script_node_down)
672	run_script (run_script_cb (this, &connection::script_node_down), false);	936	{
		937	run_script_cb *cb = new run_script_cb;
		938	cb->set<connection, &connection::script_node_down> (this);
		939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
673	}	941	}
674		942
675	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
676	delete octx; octx = 0;	944	delete octx; octx = 0;
677		945
678	si.host= 0;	946	si.host = 0;
679		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
680	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
681	retry_cnt = 0;	954	retry_cnt = 0;
682		955
683	rekey.reset ();	956	rekey.stop ();
684	keepalive.reset ();	957	keepalive.stop ();
685	establish_connection.reset ();	958	establish_connection.stop ();
686	}	959	}
687		960
688	void	961	void
689	connection::shutdown ()	962	connection::shutdown ()
690	{	963	{
…		…
692	send_reset (si);	965	send_reset (si);
693		966
694	reset_connection ();	967	reset_connection ();
695	}	968	}
696		969
697	void	970	// poor-man's rekeying
698	connection::rekey_cb (tstamp &ts)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
699	{	973	{
700	ts = TSTAMP_CANCEL;
701
702	reset_connection ();	974	reset_connection ();
703	establish_connection ();	975	establish_connection ();
704	}	976	}
705		977
706	void	978	void
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	979	connection::send_data_packet (tap_packet *pkt)
708	{	980	{
709	vpndata_packet *p = new vpndata_packet;	981	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	982	int tos = 0;
711		983
712	if (conf->inherit_tos	984	// I am not hilarious about peeking into packets, but so be it.
713	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	985	if (conf->inherit_tos && pkt->is_ipv4 ())
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	986	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		987
717	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	988	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
718	send_vpn_packet (p, si, tos);	989	send_vpn_packet (p, si, tos);
719		990
720	delete p;	991	delete p;
721		992
722	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
723	rekey ();	994	rekey ();
724	}	995	}
725		996
726	void	997	void
		998	connection::post_inject_queue ()
		999	{
		1000	// force a connection every now and when when packets are sent (max 1/s)
		1001	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		1002	establish_connection.stop ();
		1003
		1004	establish_connection ();
		1005	}
		1006
		1007	void
727	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1008	connection::inject_data_packet (tap_packet *pkt)
728	{	1009	{
729	if (ictx && octx)	1010	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	1011	send_data_packet (pkt);
731	else	1012	else
732	{	1013	{
733	if (!broadcast)//DDDD
734	queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
		1015	post_inject_queue ();
		1016	}
		1017	}
735		1018
736	establish_connection ();	1019	void
		1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1021	{
		1022	if (ictx && octx)
		1023	send_vpn_packet (pkt, si, tos);
		1024	else
		1025	{
		1026	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		1027	post_inject_queue ();
737	}	1028	}
738	}	1029	}
739		1030
740	void	1031	void
741	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
742	{	1033	{
743	last_activity = NOW;	1034	last_activity = ev_now ();
744		1035
745	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1036	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1037	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1038
		1039	if (connectmode == conf_node::C_DISABLED)
		1040	return;
747		1041
748	switch (pkt->typ ())	1042	switch (pkt->typ ())
749	{	1043	{
750	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
751	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
753	// when we receive a ping.	1049	// when we receive a ping.
754	if (!ictx)	1050	if (!ictx)
		1051	{
		1052	if (auth_rate_limiter.can (rsi))
		1053	send_auth_request (rsi, true);
		1054	}
		1055	else
		1056	// we would love to change the socket address here, but ping's aren't
		1057	// authenticated, so we best ignore it.
		1058	send_ping (rsi, 1); // pong
		1059
		1060	break;
		1061
		1062	case vpn_packet::PT_PONG:
		1063	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1064
		1065	// a PONG might mean that the other side doesn't really know
		1066	// about our desire for communication.
		1067	establish_connection ();
		1068	break;
		1069
		1070	case vpn_packet::PT_RESET:
755	{	1071	{
756	if (auth_rate_limiter.can (rsi))	1072	reset_connection ();
757	send_auth_request (rsi, true);	1073
		1074	config_packet p = (config_packet ) pkt;
		1075
		1076	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
		1077	establish_connection ();
758	}	1078	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	1079	break;
763		1080
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	1081	case vpn_packet::PT_AUTH_REQ:
768	{	1082	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet p = (config_packet ) pkt;
772
773	if (!p->chk_config ())
774	{	1083	{
		1084	auth_req_packet p = (auth_req_packet )pkt;
		1085
		1086	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1087	conf->nodename, p->initiate ? "initiate" : "reply",
		1088	p->protocols, p->features);
		1089
		1090	if (memcmp (p->magic, MAGIC, 8))
		1091	{
775	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1092	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
776	conf->nodename, (const char *)rsi);	1093	conf->nodename, (const char *)rsi);
777	connectmode = conf_node::C_DISABLED;	1094	}
		1095	else if (p->chk_config (conf, rsi))
		1096	{
		1097	if (p->prot_minor != PROTOCOL_MINOR)
		1098	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1099	conf->nodename, (const char *)rsi,
		1100	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1101
		1102	if (p->initiate)
		1103	send_auth_request (rsi, false);
		1104
		1105	auth_data auth;
		1106
		1107	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1108	{
		1109	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		1110	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1111	}
		1112	else
		1113	{
		1114	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
		1115
		1116	rcv_auth = auth;
		1117	have_rcv_auth = true;
		1118
		1119	send_auth_response (rsi);
		1120
		1121	if (chg)
		1122	{
		1123	conf->protocols = p->protocols;
		1124	features = p->features & config_packet::get_features ();
		1125
		1126	connection_established (rsi);
		1127	}
		1128	}
		1129
		1130	break;
		1131	}
		1132
		1133	send_reset (rsi);
778	}	1134	}
779	else if (connectmode == conf_node::C_ALWAYS)	1135
780	establish_connection ();
781	}
782	break;	1136	break;
783		1137
784	case vpn_packet::PT_AUTH_REQ:	1138	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	1139	{
787	auth_req_packet p = (auth_req_packet ) pkt;	1140	auth_res_packet p = (auth_res_packet )pkt;
788		1141
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1142	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
790		1143
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1144	auth_mac local_mac;
		1145	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1146
		1147	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
792	{	1148	{
793	if (p->prot_minor != PROTOCOL_MINOR)	1149	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
794	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
795	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;
802
803	if (0 > RSA_private_decrypt (sizeof (p->encr),
804	(unsigned char )&p->encr, (unsigned char )&k,
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);	1150	conf->nodename, (const char *)rsi);
808	else
809	{
810	retry_cnt = 0;
811	establish_connection.set (NOW + 8); //? ;)
812	keepalive.reset ();
813	rekey.reset ();
814
815	delete ictx;
816	ictx = 0;
817
818	delete octx;
819
820	octx = new crypto_ctx (k, 1);
821	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
822
823	conf->protocols = p->protocols;
824	send_auth_response (rsi, p->id, k);
825
826	break;
827	}
828	}	1151	}
		1152	else if (!have_snd_auth)
		1153	{
		1154	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
829		1155
830	send_reset (rsi);	1156	have_snd_auth = true;
		1157	connection_established (rsi);
		1158	}
831	}	1159	}
832
833	break;	1160	break;
834		1161
835	case vpn_packet::PT_AUTH_RES:	1162	case vpn_packet::PT_DATA_COMPRESSED:
836	{	1163	#if !ENABLE_COMPRESSION
837	auth_res_packet p = (auth_res_packet ) pkt;	1164	send_reset (rsi);
		1165	break;
		1166	#endif
838		1167
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1168	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1169
841	if (p->chk_config ())	1170	if (ictx && octx)
842	{	1171	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1172	vpndata_packet p = (vpndata_packet )pkt;
844	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
845	conf->nodename, (const char *)rsi,
846	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
847		1173
848	rsachallenge chg;	1174	if (!p->hmac_chk (ictx))
849		1175	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1176	"could be an attack, or just corruption or a synchronization error."),
851	slog (L_ERR, _("%s(%s): unrequested auth response"),
852	conf->nodename, (const char *)rsi);	1177	conf->nodename, (const char *)rsi);
853	else	1178	else
854	{	1179	{
855	crypto_ctx *cctx = new crypto_ctx (chg, 0);
856
857	if (!p->hmac_chk (cctx))
858	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
859	"could be an attack, or just corruption or an synchronization error"),
860	conf->nodename, (const char *)rsi);
861	else	1180	u32 seqno;
		1181	tap_packet *d = p->unpack (this, seqno);
		1182	int seqclass = iseqno.seqno_classify (seqno);
		1183
		1184	if (seqclass == 0) // ok
862	{	1185	{
863	rsaresponse h;	1186	vpn->tap->send (d);
864		1187
865	rsa_hash (p->id, chg, h);	1188	if (si != rsi)
866
867	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
868	{	1189	{
869	prot_minor = p->prot_minor;	1190	// fast re-sync on source address changes, useful especially for tcp/ip
870		1191	//if (last_si_change < ev_now () + 5.)
871	delete ictx; ictx = cctx;
872
873	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875	si = rsi;
876
877	rekey.set (NOW + ::conf.rekey);
878	keepalive.set (NOW + ::conf.keepalive);
879
880	// send queued packets
881	while (tap_packet *p = queue.get ())
882	{	1192	// {
883	send_data_packet (p);	1193	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1194	conf->nodename, (const char )si, (const char )rsi);
		1195
		1196	si = rsi;
		1197
		1198	if (::conf.script_node_change)
884	delete p;	1199	{
		1200	run_script_cb *cb = new run_script_cb;
		1201	cb->set<connection, &connection::script_node_change> (this);
		1202	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1203	}
		1204
885	}	1205	// }
886		1206	//else
887	connectmode = conf->connectmode;	1207	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
888
889	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
890	conf->nodename, (const char *)rsi,	1208	// conf->nodename, (const char )si, (const char )rsi);
891	strprotocol (protocol),
892	p->prot_major, p->prot_minor);
893
894	if (::conf.script_node_up)
895	run_script (run_script_cb (this, &connection::script_node_up), false);
896
897	break;
898	}	1209	}
899	else
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
901	conf->nodename, (const char *)rsi);
902	}	1210	}
		1211	else if (seqclass == 1) // far history
		1212	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1213	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1214	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1215	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1216	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1217	else if (seqclass == 3) // reset
		1218	{
		1219	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1220	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1221	send_reset (rsi);
		1222	}
903		1223
904	delete cctx;	1224	delete d;
		1225	break;
905	}	1226	}
906	}	1227	}
907	}
908		1228
909	send_reset (rsi);	1229	send_reset (rsi);
910	break;	1230	break;
911		1231
912	case vpn_packet::PT_DATA_COMPRESSED:
913	#if !ENABLE_COMPRESSION
914	send_reset (rsi);
915	break;
916	#endif
917
918	case vpn_packet::PT_DATA_UNCOMPRESSED:
919
920	if (ictx && octx)
921	{
922	vpndata_packet p = (vpndata_packet )pkt;
923
924	if (rsi == si)
925	{
926	if (!p->hmac_chk (ictx))
927	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
928	"could be an attack, or just corruption or an synchronization error"),
929	conf->nodename, (const char *)rsi);
930	else
931	{
932	u32 seqno;
933	tap_packet *d = p->unpack (this, seqno);
934
935	if (iseqno.recv_ok (seqno))
936	{
937	vpn->tap->send (d);
938
939	if (p->dst () == 0) // re-broadcast
940	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
941	{
942	connection c = i;
943
944	if (c->conf != THISNODE && c->conf != conf)
945	c->inject_data_packet (d);
946	}
947
948	delete d;
949
950	break;
951	}
952	}
953	}
954	else
955	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
956	}
957
958	send_reset (rsi);
959	break;
960
961	case vpn_packet::PT_CONNECT_REQ:	1232	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1233	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1234	{
964	connect_req_packet p = (connect_req_packet ) pkt;	1235	connect_req_packet p = (connect_req_packet )pkt;
965		1236
966	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1237	if (p->id > 0 && p->id <= vpn->conns.size ())
967	conf->protocols = p->protocols;	1238	{
968	connection *c = vpn->conns[p->id - 1];	1239	connection *c = vpn->conns[p->id - 1];
		1240	conf->protocols = p->protocols;
969		1241
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1242	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1243	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1244	p->protocols,
971	conf->id, p->id, c->ictx && c->octx);	1245	c->ictx && c->octx);
972		1246
973	if (c->ictx && c->octx)	1247	if (c->ictx && c->octx)
974	{	1248	{
975	// send connect_info packets to both sides, in case one is	1249	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1250	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1251	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1252	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1253	}
		1254	else
		1255	c->establish_connection ();
979	}	1256	}
		1257	else
		1258	slog (L_WARN,
		1259	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1260	p->id);
980	}	1261	}
981		1262
982	break;	1263	break;
983		1264
984	case vpn_packet::PT_CONNECT_INFO:	1265	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1266	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1267	{
987	connect_info_packet p = (connect_info_packet ) pkt;	1268	connect_info_packet p = (connect_info_packet )pkt;
988		1269
989	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1270	if (p->id > 0 && p->id <= vpn->conns.size ())
990	conf->protocols = p->protocols;	1271	{
991	connection *c = vpn->conns[p->id - 1];	1272	connection *c = vpn->conns[p->id - 1];
992		1273
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1274	c->conf->protocols = p->protocols;
994	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1275	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1276	p->si.upgrade_protocol (protocol, c->conf);
995		1277
		1278	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		1279	conf->nodename,
		1280	vpn->conns[p->id - 1]->conf->nodename,
		1281	(const char *)p->si,
		1282	p->protocols,
		1283	protocol,
		1284	p->si.supported_protocols (c->conf),
		1285	!c->ictx && !c->octx);
		1286
		1287	const sockinfo &dsi = forward_si (p->si);
		1288
		1289	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1290	c->send_auth_request (dsi, true);
		1291	else
		1292	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1293	vpn->conns[p->id - 1]->conf->nodename,
		1294	(const char *)p->si);
		1295	}
		1296	else
		1297	slog (L_WARN,
		1298	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1299	p->id);
997	}	1300	}
998		1301
999	break;	1302	break;
1000		1303
1001	default:	1304	default:
1002	send_reset (rsi);	1305	send_reset (rsi);
1003	break;	1306	break;
1004
1005	}	1307	}
1006	}	1308	}
1007		1309
1008	void connection::keepalive_cb (tstamp &ts)	1310	inline void
		1311	connection::keepalive_cb (ev::timer &w, int revents)
1009	{	1312	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1313	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1314
		1315	if (when >= 0)
		1316	w.start (when);
		1317	else if (when < -15)
1011	{	1318	{
1012	reset_connection ();	1319	reset_connection ();
1013	establish_connection ();	1320	establish_connection ();
1014	}	1321	}
1015	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1322	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1323	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1324	{
		1325	w.start (3);
1020	send_ping (si);	1326	send_ping (si);
1021	ts = NOW + 5;
1022	}	1327	}
		1328	else if (when >= -10)
		1329	// hold ondemand connections implicitly a few seconds longer
		1330	// should delete octx, though, or something like that ;)
		1331	w.start (when + 10);
1023	else	1332	else
1024	reset_connection ();	1333	reset_connection ();
1025	}	1334	}
1026		1335
		1336	void
1027	void connection::connect_request (int id)	1337	connection::send_connect_request (int id)
1028	{	1338	{
1029	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1339	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1030		1340
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1341	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1342	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1343	THISNODE->protocols);
1032	p->hmac_set (octx);	1344	p->hmac_set (octx);
1033	send_vpn_packet (p, si);	1345	send_vpn_packet (p, si);
1034		1346
1035	delete p;	1347	delete p;
1036	}	1348	}
1037		1349
1038	void connection::script_node ()	1350	void
		1351	connection::script_init_env (const char *ext)
1039	{	1352	{
1040	vpn->script_if_up (0);
1041
1042	char *env;	1353	char *env;
		1354	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1355	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1356	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1357	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1358	conf->id & 0xff); putenv (env);
		1359	}
		1360
		1361	void
		1362	connection::script_init_connect_env ()
		1363	{
		1364	vpn->script_init_env ();
		1365
		1366	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1367	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1368	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1369	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1370	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1371	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1372	}
1048		1373
		1374	inline const char *
1049	const char *connection::script_node_up (int)	1375	connection::script_node_up ()
1050	{	1376	{
1051	script_node ();	1377	script_init_connect_env ();
1052		1378
1053	putenv ("STATE=up");	1379	putenv ((char *)"STATE=up");
1054		1380
		1381	char *filename;
		1382	asprintf (&filename,
		1383	"%s/%s",
		1384	confbase,
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1385	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1056	}
1057		1386
		1387	return filename;
		1388	}
		1389
		1390	inline const char *
		1391	connection::script_node_change ()
		1392	{
		1393	script_init_connect_env ();
		1394
		1395	putenv ((char *)"STATE=change");
		1396
		1397	char *filename;
		1398	asprintf (&filename,
		1399	"%s/%s",
		1400	confbase,
		1401	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1402
		1403	return filename;
		1404	}
		1405
		1406	inline const char *
1058	const char *connection::script_node_down (int)	1407	connection::script_node_down ()
1059	{	1408	{
1060	script_node ();	1409	script_init_connect_env ();
1061		1410
1062	putenv ("STATE=down");	1411	putenv ((char *)"STATE=down");
1063		1412
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1413	char *filename;
1065	}	1414	asprintf (&filename,
		1415	"%s/%s",
		1416	confbase,
		1417	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1066		1418
1067	// send a vpn packet out to other hosts	1419	return filename;
1068	void
1069	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1070	{
1071	if (protocol & PROT_IPv4)
1072	vpn->send_ipv4_packet (pkt, si, tos);
1073	else
1074	vpn->send_udpv4_packet (pkt, si, tos);
1075	}	1420	}
1076		1421
1077	connection::connection(struct vpn *vpn_)	1422	connection::connection (struct vpn vpn, conf_node conf)
1078	: vpn(vpn_)	1423	: vpn(vpn), conf(conf),
1079	, rekey (this, &connection::rekey_cb)	1424	#if ENABLE_DNS
1080	, keepalive (this, &connection::keepalive_cb)	1425	dns (0),
		1426	#endif
		1427	data_queue(conf->max_ttl, conf->max_queue + 1),
		1428	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1429	{
		1430	rekey .set<connection, &connection::rekey_cb > (this);
		1431	keepalive .set<connection, &connection::keepalive_cb > (this);
1081	, establish_connection (this, &connection::establish_connection_cb)	1432	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1082	{	1433
		1434	last_establish_attempt = 0.;
1083	octx = ictx = 0;	1435	octx = ictx = 0;
1084	retry_cnt = 0;
1085		1436
1086	connectmode = conf_node::C_ALWAYS; // initial setting	1437	connectmode = conf->connectmode;
		1438
		1439	// queue a dummy packet to force an initial connection attempt
		1440	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1441	vpn_queue.put (new net_packet);
		1442
1087	reset_connection ();	1443	reset_connection ();
1088	}	1444	}
1089		1445
1090	connection::~connection ()	1446	connection::~connection ()
1091	{	1447	{
1092	shutdown ();	1448	shutdown ();
1093	}	1449	}
1094		1450
		1451	void
1095	void connection_init ()	1452	connection_init ()
1096	{	1453	{
1097	auth_rate_limiter.clear ();	1454	auth_rate_limiter.clear ();
1098	reset_rate_limiter.clear ();	1455	reset_rate_limiter.clear ();
1099	}	1456	}
1100		1457

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Comparing gvpe/src/connection.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs. Revision 1.107 by root, Fri Sep 20 11:57:03 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.107 by root, Fri Sep 20 11:57:03 2013 UTC