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Comparing gvpe/src/connection.C (file contents):
Revision 1.57 by pcg, Thu Jul 7 14:41:51 2005 UTC vs.
Revision 1.109 by root, Fri Oct 11 07:56:07 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	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
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	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
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	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
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.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
30		50
31	#include "conf.h"	51	#include "conf.h"
32	#include "slog.h"	52	#include "slog.h"
33	#include "device.h"	53	#include "device.h"
34	#include "vpn.h"	54	#include "vpn.h"
35	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
36		57
37	#include "netcompat.h"	58	#include "netcompat.h"
38		59
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#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
44		62
45	#define ULTRA_FAST 1	63	#define ULTRA_FAST 1
46	#define HLOG 15	64	#define HLOG 15
47	#include "lzf/lzf.h"	65	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	66	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	67	#include "lzf/lzf_d.c"
50		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	//////////////////////////////////////////////////////////////////////////////
		112
51	struct crypto_ctx	113	struct crypto_ctx
52	{	114	{
53	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	116	HMAC_CTX hctx;
55		117
56	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);
57	~crypto_ctx ();	119	~crypto_ctx ();
58	};	120	};
59		121
60	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)
61	{	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
62	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	154	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	155	}
67		156
68	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
69	{	158	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
72	}	161	}
73		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
74	static void	190	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	192	{
77	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	197	}
86		198
87	struct rsa_entry {	199	void
88	tstamp expire;	200	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	201	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	203	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	204	// request data
102	{	205	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		207
105	erase (i);	208	// eventual response data
106	return true;	209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	210	}
109		211
110	if (cleaner.at < NOW)	212	// every use prolongs the expiry
111	cleaner.start (NOW + RSA_TTL);	213	auth_expire = ev_now () + AUTH_TTL;
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = NOW + RSA_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (cleaner.at < NOW)
130	cleaner.start (NOW + RSA_TTL);
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{ }
136
137	} rsa_cache;
138
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{
143	w.start (NOW + RSA_TTL);
144
145	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)
147	i = erase (i);
148	else
149	++i;
150	}
151	}	214	}
152		215
153	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
154		217
155	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
156	{	220	{
157	if (queue[i])	221	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		222
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	223	i = 0;
185	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	227	}
187		228
188	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
189	{	230	{
190	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
191	delete queue[i];	234	delete [] queue;
192	}	235	}
193		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
194	struct net_rateinfo {	293	struct net_rateinfo
		294	{
195	u32 host;	295	u32 host;
196	double pcnt, diff;	296	double pcnt, diff;
197	tstamp last;	297	tstamp last;
198	};	298	};
199		299
…		…
209		309
210	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	311	bool can (u32 host);
212	};	312	};
213		313
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		315
		316	bool
216	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
217	{	318	{
218	iterator i;	319	iterator i;
219		320
220	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
221	if (i->host == host)	322	if (i->host == host)
222	break;	323	break;
223	else if (i->last < NOW - NRL_EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	325	i = erase (i);
225	else	326	else
226	i++;	327	i++;
227		328
228	if (i == end ())	329	if (i == end ())
…		…
230	net_rateinfo ri;	331	net_rateinfo ri;
231		332
232	ri.host = host;	333	ri.host = host;
233	ri.pcnt = 1.;	334	ri.pcnt = 1.;
234	ri.diff = NRL_MAXDIF;	335	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	336	ri.last = ev_now ();
236		337
237	push_front (ri);	338	push_front (ri);
238		339
239	return true;	340	return true;
240	}	341	}
…		…
242	{	343	{
243	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
244	erase (i);	345	erase (i);
245		346
246	ri.pcnt = ri.pcnt * NRL_ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		349
249	ri.last = NOW;	350	ri.last = ev_now ();
250		351
251	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
252		353
253	bool send = dif > NRL_CUTOFF;	354	bool send = dif > NRL_CUTOFF;
254		355
…		…
266	}	367	}
267	}	368	}
268		369
269	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
270		371
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	374	{
275	unsigned int xlen;
276
277	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
278		376
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
281	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	380	}
284		381
285	void	382	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	384	{
288	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		386	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	388	}
292		389
293	bool	390	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	392	{
296	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		394	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
299	}	396	}
300		397
		398	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	400	{
303	type = type_;	401	type = type_;
304		402
305	int src = THISNODE->id;	403	int src = THISNODE->id;
306		404
…		…
311		409
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		412
315	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
316	{	422	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	424	}
		425	};
328		426
329	void	427	void
330	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)
331	{	429	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
334	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
335		433
336	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
338		436
339	if (conn->features & ENABLE_COMPRESSION)	437	if (conn->features & FEATURE_COMPRESSION)
340	{	438	{
341	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
342		440
343	if (cl)	441	if (cl)
344	{	442	{
…		…
350	d[1] = cl;	448	d[1] = cl;
351	}	449	}
352	}	450	}
353	#endif	451	#endif
354		452
355	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
356		454
357	struct {	455	struct {
358	#if RAND_SIZE	456	#if RAND_SIZE
359	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
360	#endif	458	#endif
361	u32 seqno;	459	u32 seqno;
362	} datahdr;	460	} datahdr;
363		461
364	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
365	#if RAND_SIZE	463	#if RAND_SIZE
366	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);
367	#endif	467	#endif
368		468
369	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
370	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
371	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
393	int outl = 0, outl2;	493	int outl = 0, outl2;
394	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
395	u8 *d;	495	u8 *d;
396	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
397		497
398	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
399		499
400	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
401	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
402		502
403	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
404	d = cdata;	504	d = cdata;
405	else	505	else
406	#endif	506	#endif
407	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
408		508
409	/* 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
410	require (EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
411	d, &outl2,	517	d, &outl2,
412	(unsigned char *)&data, len - data_hdr_size ()));	518	(unsigned char *)&data, len - data_hdr_size ()));
413	outl += outl2;	519	outl += outl2;
414		520
…		…
445	}	551	}
446	};	552	};
447		553
448	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
449	{	555	{
450	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
451	// field comes before this data, so peers with other
452	// hmacs simply will not work.
453	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
454	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
455	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
456		560
457	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
458	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
459		563
460	static u8 get_features ()	564	static u8 get_features ()
461	{	565	{
462	u8 f = 0;	566	u8 f = 0;
463	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
464	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
465	#endif	569	#endif
466	#if ENABLE_ROHC	570	#if ENABLE_ROHC
467	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
468	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
469	return f;	576	return f;
470	}	577	}
471	};	578	};
472		579
		580	void
473	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
474	{	582	{
475	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
476	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
477	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
478	hmaclen = HMACLENGTH;
479	flags = 0;	586	flags = 0;
480	challengelen = sizeof (rsachallenge);
481	features = get_features ();	587	features = get_features ();
482		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
483	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
484	digest_nid = htonl (EVP_MD_type (RSA_HASH));
485	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 ()));
486		594
487	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
488	set_hdr (type, dst);	596	set_hdr (type, dst);
489	}	597	}
490		598
491	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
492	{	601	{
493	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
494	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
495	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
496	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
497	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
498	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
499	else if (challengelen != sizeof (rsachallenge))
500	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
501	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
502	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
503	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
504	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
505	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
506	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (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 ()));
507	else	617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		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)
508	return true;	625	return true;
		626	}
509		627
510	return false;	628	return false;
511	}	629	}
512		630
513	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
514	{	632	{
515	char magic[8];	633	char magic[8];
516	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
517	u8 protocols; // supported protocols (will be patched on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
518	u8 pad2, pad3;	636	u8 pad2, pad3;
519	rsaid id;	637	auth_encr encr;
520	rsaencrdata encr;
521		638
522	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
523	{	640	{
524	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
525	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
526	initiate = !!initiate_;	643	initiate = !!initiate_;
527	protocols = protocols_;	644	protocols = protocols_;
528		645
529	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
530	}	647	}
531	};	648	};
532		649
533	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
534	{	651	{
535	rsaid id;
536	u8 pad1, pad2, pad3;
537	u8 response_len; // encrypted length
538	rsaresponse response;	652	auth_response response;
539		653
540	auth_res_packet (int dst)	654	auth_res_packet (int dst)
541	{	655	{
542	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
543		657
544	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
545	}	659	}
546	};	660	};
547		661
…		…
577	};	691	};
578		692
579	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
580		694
581	void	695	void
582	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
583	{	697	{
584	if (ictx && octx)	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	vpn->can_direct (THISNODE, conf) ? "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."));
585	{	714	}
586	connectmode = conf->connectmode;	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);
587		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
588	// make sure rekeying timeouts are slightly asymmetric	724	// make sure rekeying timeouts are slightly asymmetric
589	rekey.start (NOW + ::conf.rekey	725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
590	+ (conf->id > THISNODE->id ? 10 : 0));	726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
591	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
592		731
593	// send queued packets	732	// send queued packets
594	if (ictx && octx)
595	{
596	while (tap_packet *p = (tap_packet *)data_queue.get ())	733	while (tap_packet *p = (tap_packet *)data_queue.get ())
597	{	734	{
598	send_data_packet (p);	735	if (p->len) send_data_packet (p);
599	delete p;	736	delete p;
600	}	737	}
601		738
602	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
603	{	740	{
604	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
605	delete p;	742	delete p;
606	}
607	}
608	}	743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
		749	connection::reset_si ()
		750	{
		751	if (vpn->can_direct (THISNODE, conf))
		752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
609	else	753	else
610	{	754	{
611	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	establish_connection.start (NOW + 5);	756	protocol = 0;
613	keepalive.stop ();
614	rekey.stop ();
615	}	757	}
616	}
617
618	void
619	connection::reset_si ()
620	{
621	protocol = best_protocol (THISNODE->protocols & conf->protocols);
622
623	// mask out protocols we cannot establish
624	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
625	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
626	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
627		758
628	si.set (conf, protocol);	759	si.set (conf, protocol);
629	}	760	}
630		761
631	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
632	const sockinfo &	763	const sockinfo &
633	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
634	{	765	{
635	if (!si.valid ())	766	if (!si.valid ())
636	{	767	{
637	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
638		769
639	if (r)	770	if (r)
640	{	771	{
641	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
642	conf->nodename, r->conf->nodename, (const char *)r->si);	773	conf->nodename, r->conf->nodename);
643	return r->si;	774	return r->si;
644	}	775	}
645	else	776	else
646	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
647	conf->nodename);	778	conf->nodename);
648	}	779	}
649		780
650	return si;	781	return si;
651	}	782	}
652		783
653	void	784	void
654	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
655	{	786	{
656	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
657	reset_connection ();	788	reset_connection ("packet send error");
658	}	789	}
659		790
660	void	791	void
661	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
662	{	793	{
663	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
664		795
665	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	796	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		797
		798	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
666	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
667		800
668	delete pkt;	801	delete pkt;
669	}	802	}
670		803
…		…
685	void	818	void
686	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
687	{	820	{
688	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
689		822
690	rsachallenge chg;	823	generate_auth_data ();
691	rsa_cache.gen (pkt->id, chg);
692	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
693		825
694	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
695
696	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
697		828
698	delete pkt;	829	delete pkt;
699	}	830	}
700		831
701	void	832	void
702	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
703	{	834	{
704	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
705		836
706	pkt->id = id;	837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
707		839
708	rsa_hash (id, chg, pkt->response);
709
710	pkt->hmac_set (octx);
711
712	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
713
714	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
715		842
716	delete pkt;	843	delete pkt;
717	}	844	}
718		845
719	void	846	void
720	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
721	{	848	{
722	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
723	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
724		852
725	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
726		854
727	r->hmac_set (octx);	855	r->hmac_set (octx);
728	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
729		857
730	delete r;	858	delete r;
731	}	859	}
732		860
733	void	861	inline void
734	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
735	{	863	{
736	if (!ictx	864	if (!(ictx && octx)
737	&& conf != THISNODE	865	&& conf != THISNODE
738	&& connectmode != conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
739	&& connectmode != conf_node::C_DISABLED	867	&& connectmode != conf_node::C_DISABLED
740	&& NOW > w.at)	868	&& !w.is_active ())
741	{	869	{
742	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		871	// and stop trying. should probably be handled by a per-connection expire handler.
		872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
		875	return;
		876	}
743		877
744	double retry_int = double (retry_cnt & 3	878	last_establish_attempt = ev_now ();
		879
		880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
745	? (retry_cnt & 3) + 1	881	? (retry_cnt & 3) + 1
746	: 1 << (retry_cnt >> 2));	882	: 1 << (retry_cnt >> 2));
747		883
748	reset_si ();	884	reset_si ();
749		885
750	bool slow = si.prot & PROT_SLOW;	886	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
751		887
752	if (si.prot && !si.host)	888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		889	{
		890	/*TODO*/ /* start the timer so we don't recurse endlessly */
		891	w.start (1);
753	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
754	else	894	else
755	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
756	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
757		901
758	slow = slow || (dsi.prot & PROT_SLOW);	902	slow = slow || (dsi.prot & PROT_SLOW);
759		903
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	905	{
762	if (retry_cnt < 4)	906	// use ping after the first few retries
		907	// TODO: on rekeys, the other node might not interpret ping correctly,
		908	// TODO: as it will still have a valid connection
		909	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
763	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
764	else	911	else
765	send_ping (dsi, 0);	912	send_ping (dsi, 0);
766	}	913	}
767	}	914	}
768		915
769	retry_int *= slow ? 8. : 0.7;	916	retry_int *= slow ? 4. : 0.9;
770		917
771	if (retry_int < conf->max_retry)	918	if (retry_int < conf->max_retry)
772	retry_cnt++;	919	retry_cnt++;
773	else	920	else
774	retry_int = conf->max_retry;	921	retry_int = conf->max_retry;
775		922
776	w.start (NOW + retry_int);	923	w.start (retry_int);
777	}	924	}
778	}	925	}
779		926
780	void	927	void
781	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
782	{	929	{
783	if (ictx && octx)	930	if (ictx && octx)
784	{	931	{
785	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
786	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
787		934
788	if (::conf.script_node_down)	935	if (::conf.script_node_down)
789	if (!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);
790	slog (L_WARN, _("node-down command execution failed, continuing."));	939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
791	}	941	}
792		942
793	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
794	delete octx; octx = 0;	944	delete octx; octx = 0;
795	#if ENABLE_DNS
796	dnsv4_reset_connection ();
797	#endif
798		945
799	si.host = 0;	946	si.host = 0;
800		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
801	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
802	retry_cnt = 0;	954	retry_cnt = 0;
803		955
804	rekey.stop ();	956	rekey.stop ();
805	keepalive.stop ();	957	keepalive.stop ();
806	establish_connection.stop ();	958	establish_connection.stop ();
…		…
810	connection::shutdown ()	962	connection::shutdown ()
811	{	963	{
812	if (ictx && octx)	964	if (ictx && octx)
813	send_reset (si);	965	send_reset (si);
814		966
815	reset_connection ();	967	reset_connection ("shutdown");
816	}	968	}
817		969
818	void	970	// poor-man's rekeying
819	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
820	{	973	{
821	reset_connection ();	974	reset_connection ("rekeying");
822	establish_connection ();	975	establish_connection ();
823	}	976	}
824		977
825	void	978	void
826	connection::send_data_packet (tap_packet *pkt)	979	connection::send_data_packet (tap_packet *pkt)
…		…
840	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
841	rekey ();	994	rekey ();
842	}	995	}
843		996
844	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 >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1002	establish_connection.stop ();
		1003
		1004	establish_connection ();
		1005	}
		1006
		1007	void
845	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1008	connection::inject_data_packet (tap_packet *pkt)
846	{	1009	{
847	if (ictx && octx)	1010	if (ictx && octx)
848	send_data_packet (pkt);	1011	send_data_packet (pkt);
849	else	1012	else
850	{	1013	{
851	if (!broadcast)
852	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
853		1015	post_inject_queue ();
854	establish_connection ();
855	}	1016	}
856	}	1017	}
857		1018
		1019	void
858	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
859	{	1021	{
860	if (ictx && octx)	1022	if (ictx && octx)
861	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
862	else	1024	else
863	{	1025	{
864	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1026	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
865		1027	post_inject_queue ();
866	establish_connection ();
867	}	1028	}
868	}	1029	}
869		1030
870	void	1031	void
871	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
872	{	1033	{
873	last_activity = NOW;	1034	last_activity = ev_now ();
874		1035
875	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.",
876	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;
877		1041
878	switch (pkt->typ ())	1042	switch (pkt->typ ())
879	{	1043	{
880	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
881	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
882	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
883	// when we receive a ping.	1049	// when we receive a ping.
884	if (!ictx)	1050	if (!ictx)
885	{	1051	{
886	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
887	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
888	}	1054	}
889	else	1055	else
		1056	// we would love to change the socket address here, but ping's aren't
		1057	// authenticated, so we best ignore it.
890	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
891		1059
892	break;	1060	break;
893		1061
894	case vpn_packet::PT_PONG:	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 ();
895	break;	1068	break;
896		1069
897	case vpn_packet::PT_RESET:	1070	case vpn_packet::PT_RESET:
		1071	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1072
		1073	if (ictx && octx)
898	{	1074	{
899	reset_connection ();	1075	reset_connection ("remote reset");
900		1076
901	config_packet *p = (config_packet *) pkt;	1077	config_packet *p = (config_packet *) pkt;
902		1078
903	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
904	{
905	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
906	conf->nodename, (const char *)rsi);
907	connectmode = conf_node::C_DISABLED;
908	}
909	else if (connectmode == conf_node::C_ALWAYS)
910	establish_connection ();	1080	establish_connection ();
911	}	1081	}
		1082
912	break;	1083	break;
913		1084
914	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
915	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
916	{	1087	{
917	auth_req_packet *p = (auth_req_packet *) pkt;	1088	auth_req_packet *p = (auth_req_packet *)pkt;
918		1089
919	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1090	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1091	conf->nodename, p->initiate ? "initiate" : "reply",
		1092	p->protocols, p->features);
920		1093
921	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1094	if (memcmp (p->magic, MAGIC, 8))
		1095	{
		1096	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1097	conf->nodename, (const char *)rsi);
		1098	}
		1099	else if (p->chk_config (conf, rsi))
922	{	1100	{
923	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
924	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1102	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
925	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
926	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
927		1105
928	if (p->initiate)	1106	if (p->initiate)
		1107	{
929	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
930		1109
931	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
932		1113
		1114	auth_data auth;
		1115
933	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
934	{	1117	{
935	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1118	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
936	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1119	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
937	break;
938	}	1120	}
939	else	1121	else
940	{	1122	{
941	delete octx;	1123	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
942		1124
943	octx = new crypto_ctx (k, 1);	1125	rcv_auth = auth;
944	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1126	have_rcv_auth = true;
945		1127
		1128	send_auth_response (rsi);
		1129
		1130	if (chg)
		1131	{
946	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1133	features = p->features & config_packet::get_features ();
948		1134
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1135	connection_established (rsi);
952
953	break;	1136	}
954	}	1137	}
		1138
		1139	break;
955	}	1140	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1141
960	send_reset (rsi);	1142	send_reset (rsi);
961	}	1143	}
962		1144
963	break;	1145	break;
964		1146
965	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
966	{	1148	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1149	auth_res_packet *p = (auth_res_packet *)pkt;
968		1150
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1152
971	if (p->chk_config ())	1153	auth_mac local_mac;
		1154	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1155
		1156	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
972	{	1157	{
973	if (p->prot_minor != PROTOCOL_MINOR)
974	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
975	conf->nodename, (const char *)rsi,
976	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
977
978	rsachallenge chg;
979
980	if (!rsa_cache.find (p->id, chg))
981	{
982	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
984	break;
985	}	1160	}
986	else	1161	else if (!have_snd_auth)
987	{	1162	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
989		1164
990	if (!p->hmac_chk (cctx))	1165	have_snd_auth = true;
991	{
992	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
993	"could be an attack, or just corruption or a synchronization error"),
994	conf->nodename, (const char *)rsi);
995	break;
996	}
997	else
998	{
999	rsaresponse h;
1000
1001	rsa_hash (p->id, chg, h);
1002
1003	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1004	{
1005	prot_minor = p->prot_minor;
1006
1007	delete ictx; ictx = cctx;
1008
1009	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1010
1011	si = rsi;
1012	protocol = rsi.prot;
1013
1014	connection_established ();	1166	connection_established (rsi);
1015
1016	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1017	conf->nodename, (const char *)rsi,
1018	p->prot_major, p->prot_minor);
1019
1020	if (::conf.script_node_up)
1021	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1022	slog (L_WARN, _("node-up command execution failed, continuing."));
1023
1024	break;
1025	}
1026	else
1027	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1028	conf->nodename, (const char *)rsi);
1029	}
1030
1031	delete cctx;
1032	}
1033	}	1167	}
1034	}	1168	}
1035
1036	send_reset (rsi);
1037	break;	1169	break;
1038		1170
1039	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
1040	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
1041	send_reset (rsi);	1173	send_reset (rsi);
…		…
1047	if (ictx && octx)	1179	if (ictx && octx)
1048	{	1180	{
1049	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1050		1182
1051	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
		1184	{
		1185	// rekeying often creates temporary hmac auth floods
		1186	// we assume they don't take longer than a few seconds normally,
		1187	// and suppress messages and resets during that time.
		1188	//TODO: should be done per source address
		1189	if (!hmac_error)
		1190	{
		1191	hmac_error = ev_now () + 3;
		1192	break;
		1193	}
		1194	else if (hmac_error >= ev_now ())
		1195	break; // silently suppress
		1196	else
		1197	{
1052	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1198	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1053	"could be an attack, or just corruption or a synchronization error"),	1199	"could be an attack, or just corruption or a synchronization error."),
1054	conf->nodename, (const char *)rsi);	1200	conf->nodename, (const char *)rsi);
		1201	// reset
		1202	}
		1203	}
1055	else	1204	else
1056	{	1205	{
1057	u32 seqno;	1206	u32 seqno;
1058	tap_packet *d = p->unpack (this, seqno);	1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
1059		1209
1060	if (iseqno.recv_ok (seqno))	1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
1061	{	1213	{
1062	vpn->tap->send (d);	1214	vpn->tap->send (d);
1063		1215
1064	if (si != rsi)	1216	if (si != rsi)
1065	{	1217	{
1066	// fast re-sync on source address changes, useful especially for tcp/ip	1218	// fast re-sync on source address changes, useful especially for tcp/ip
		1219	//if (last_si_change < ev_now () + 5.)
1067	si = rsi;	1220	// {
1068
1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1070	conf->nodename, (const char *)si, (const char *)rsi);	1222	conf->nodename, (const char *)si, (const char *)rsi);
		1223
		1224	si = rsi;
		1225
		1226	if (::conf.script_node_change)
		1227	{
		1228	run_script_cb *cb = new run_script_cb;
		1229	cb->set<connection, &connection::script_node_change> (this);
		1230	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1231	}
		1232
		1233	// }
		1234	//else
		1235	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1236	// conf->nodename, (const char *)si, (const char *)rsi);
1071	}	1237	}
		1238	}
		1239	else if (seqclass == 1) // far history
		1240	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1241	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1242	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1243	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1244	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1245	else if (seqclass == 3) // reset
		1246	{
		1247	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1248	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1249	send_reset (rsi);
1072	}	1250	}
1073		1251
1074	delete d;	1252	delete d;
1075	break;	1253	break;
1076	}	1254	}
…		…
1080	break;	1258	break;
1081		1259
1082	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1084	{	1262	{
1085	connect_req_packet *p = (connect_req_packet *) pkt;	1263	connect_req_packet *p = (connect_req_packet *)pkt;
1086		1264
1087	if (p->id > 0 && p->id <= vpn->conns.size ())	1265	if (p->id > 0 && p->id <= vpn->conns.size ())
1088	{	1266	{
1089	connection *c = vpn->conns[p->id - 1];	1267	connection *c = vpn->conns[p->id - 1];
1090	conf->protocols = p->protocols;	1268	conf->protocols = p->protocols;
1091		1269
1092	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1270	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1271	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1272	p->protocols,
1093	conf->id, p->id, c->ictx && c->octx);	1273	c->ictx && c->octx);
1094		1274
1095	if (c->ictx && c->octx)	1275	if (c->ictx && c->octx)
1096	{	1276	{
1097	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
1098	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
…		…
1121		1301
1122	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1123	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1303	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1124	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1125		1305
1126	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1306	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1127	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1307	conf->nodename,
		1308	vpn->conns[p->id - 1]->conf->nodename,
		1309	(const char *)p->si,
		1310	p->protocols,
		1311	protocol,
		1312	p->si.supported_protocols (c->conf),
		1313	!c->ictx && !c->octx);
1128		1314
1129	const sockinfo &dsi = forward_si (p->si);	1315	const sockinfo &dsi = forward_si (p->si);
1130		1316
1131	if (dsi.valid ())	1317	if (dsi.valid ())
1132	c->send_auth_request (dsi, true);	1318	c->send_auth_request (dsi, true);
		1319	else
		1320	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1321	vpn->conns[p->id - 1]->conf->nodename,
		1322	(const char *)p->si);
1133	}	1323	}
1134	else	1324	else
1135	slog (L_WARN,	1325	slog (L_WARN,
1136	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1326	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137	p->id);	1327	p->id);
…		…
1143	send_reset (rsi);	1333	send_reset (rsi);
1144	break;	1334	break;
1145	}	1335	}
1146	}	1336	}
1147		1337
1148	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1149	{	1340	{
1150	if (NOW >= last_activity + ::conf.keepalive + 30)	1341	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1342
		1343	if (when >= 0)
		1344	w.start (when);
		1345	else if (when < -15)
1151	{	1346	{
1152	reset_connection ();	1347	reset_connection ("keepalive overdue");
1153	establish_connection ();	1348	establish_connection ();
1154	}	1349	}
1155	else if (NOW < last_activity + ::conf.keepalive)
1156	w.start (last_activity + ::conf.keepalive);
1157	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1158	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1159	{	1352	{
		1353	w.start (3);
1160	send_ping (si);	1354	send_ping (si);
1161	w.start (NOW + 5);
1162	}	1355	}
1163	else if (NOW < last_activity + ::conf.keepalive + 10)	1356	else if (when >= -10)
1164	// hold ondemand connections implicitly a few seconds longer	1357	// hold ondemand connections implicitly a few seconds longer
1165	// should delete octx, though, or something like that ;)	1358	// should delete octx, though, or something like that ;)
1166	w.start (last_activity + ::conf.keepalive + 10);	1359	w.start (when + 10);
1167	else	1360	else
1168	reset_connection ();	1361	reset_connection ("keepalive timeout");
1169	}	1362	}
1170		1363
		1364	void
1171	void connection::send_connect_request (int id)	1365	connection::send_connect_request (int id)
1172	{	1366	{
1173	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1367	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1174		1368
1175	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1369	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1370	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1371	THISNODE->protocols);
1176	p->hmac_set (octx);	1372	p->hmac_set (octx);
1177	send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1178		1374
1179	delete p;	1375	delete p;
1180	}	1376	}
1181		1377
		1378	void
1182	void connection::script_init_env (const char *ext)	1379	connection::script_init_env (const char *ext)
1183	{	1380	{
1184	char *env;	1381	char *env;
1185	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1382	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1186	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1383	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1384	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1385	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189	conf->id & 0xff); putenv (env);	1386	conf->id & 0xff); putenv (env);
1190	}	1387	}
1191		1388
		1389	void
1192	void connection::script_init_connect_env ()	1390	connection::script_init_connect_env ()
1193	{	1391	{
1194	vpn->script_init_env ();	1392	vpn->script_init_env ();
1195		1393
1196	char *env;	1394	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1395	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1396	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1400	}
1202		1401
		1402	inline const char *
1203	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1204	{	1404	{
1205	script_init_connect_env ();	1405	script_init_connect_env ();
1206		1406
1207	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1208		1408
1209	char *filename;	1409	char *filename;
1210	asprintf (&filename,	1410	asprintf (&filename,
1211	"%s/%s",	1411	"%s/%s",
1212	confbase,	1412	confbase,
1213	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1214		1414
1215	return filename;	1415	return filename;
1216	}	1416	}
1217		1417
1218	const char *connection::script_node_down ()	1418	inline const char *
		1419	connection::script_node_change ()
1219	{	1420	{
1220	script_init_connect_env ();	1421	script_init_connect_env ();
1221		1422
		1423	putenv ((char *)"STATE=change");
		1424
		1425	char *filename;
		1426	asprintf (&filename,
		1427	"%s/%s",
		1428	confbase,
		1429	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1430
		1431	return filename;
		1432	}
		1433
		1434	inline const char *
		1435	connection::script_node_down ()
		1436	{
		1437	script_init_connect_env ();
		1438
1222	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1223		1440
1224	char *filename;	1441	char *filename;
1225	asprintf (&filename,	1442	asprintf (&filename,
1226	"%s/%s",	1443	"%s/%s",
1227	confbase,	1444	confbase,
…		…
1229		1446
1230	return filename;	1447	return filename;
1231	}	1448	}
1232		1449
1233	connection::connection (struct vpn *vpn, conf_node *conf)	1450	connection::connection (struct vpn *vpn, conf_node *conf)
1234	: vpn(vpn), conf(conf)	1451	: vpn(vpn), conf(conf),
1235	, rekey (this, &connection::rekey_cb)
1236	, keepalive (this, &connection::keepalive_cb)
1237	, establish_connection (this, &connection::establish_connection_cb)
1238	#if ENABLE_DNS	1452	#if ENABLE_DNS
1239	, dns (0)	1453	dns (0),
1240	#endif	1454	#endif
		1455	data_queue(conf->max_ttl, conf->max_queue + 1),
		1456	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1241	{	1457	{
		1458	rekey .set<connection, &connection::rekey_cb > (this);
		1459	keepalive .set<connection, &connection::keepalive_cb > (this);
		1460	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1461
		1462	last_establish_attempt = 0.;
1242	octx = ictx = 0;	1463	octx = ictx = 0;
1243	retry_cnt = 0;
1244		1464
1245	if (!conf->protocols) // make sure some protocol is enabled	1465	connectmode = conf->connectmode;
1246	conf->protocols = PROT_UDPv4;
1247		1466
1248	connectmode = conf_node::C_ALWAYS; // initial setting	1467	// queue a dummy packet to force an initial connection attempt
		1468	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1469	vpn_queue.put (new net_packet);
		1470
1249	reset_connection ();	1471	reset_connection ("startup");
1250	}	1472	}
1251		1473
1252	connection::~connection ()	1474	connection::~connection ()
1253	{	1475	{
1254	shutdown ();	1476	shutdown ();
1255	}	1477	}
1256		1478
		1479	void
1257	void connection_init ()	1480	connection_init ()
1258	{	1481	{
1259	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1260	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1261	}	1484	}
1262		1485

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