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Comparing gvpe/src/connection.C (file contents):
Revision 1.63 by pcg, Sun Dec 2 00:45:41 2007 UTC vs.
Revision 1.113 by root, Thu Jan 29 00:21:39 2015 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) require (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
44		61
45	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
46	#define HLOG 15	63	#define HLOG 15
47	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
50		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb *cb, const char *warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
51	struct crypto_ctx	112	struct crypto_ctx
52	{	113	{
53	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	115	HMAC_CTX hctx;
55		116
56	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	118	~crypto_ctx ();
58	};	119	};
59		120
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
62	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	153	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	154	}
67		155
68	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
69	{	157	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
72	}	160	}
73		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
74	static void	189	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	191	{
77	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	195	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	}	196	}
86		197
87	struct rsa_entry	198	void
		199	connection::generate_auth_data ()
88	{	200	{
89	tstamp expire;	201	if (auth_expire < ev_now ())
90	rsaid id;
91	rsachallenge chg;
92	};
93
94	struct rsa_cache : list<rsa_entry>
95	{
96	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
97
98	bool find (const rsaid &id, rsachallenge &chg)
99	{
100	for (iterator i = begin (); i != end (); ++i)
101	{	202	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	203	// request data
103	{	204	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
105		206
106	erase (i);	207	// eventual response data
107	return true;	208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	209	}
110		210
111	if (!cleaner.is_active ())	211	// every use prolongs the expiry
112	cleaner.again ();
113
114	return false;
115	}
116
117	void gen (rsaid &id, rsachallenge &chg)
118	{
119	rsa_entry e;
120
121	RAND_bytes ((unsigned char *)&id, sizeof id);
122	RAND_bytes ((unsigned char *)&chg, sizeof chg);
123
124	e.expire = ev_now () + RSA_TTL;	212	auth_expire = ev_now () + AUTH_TTL;
125	e.id = id;
126	memcpy (&e.chg, &chg, sizeof chg);
127
128	push_back (e);
129
130	if (!cleaner.is_active ())
131	cleaner.again ();
132	}
133
134	rsa_cache ()
135	: cleaner (this, &rsa_cache::cleaner_cb)
136	{
137	cleaner.set (RSA_TTL, RSA_TTL);
138	}
139
140	} rsa_cache;
141
142	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
143	{
144	if (empty ())
145	w.stop ();
146	else
147	{
148	for (iterator i = begin (); i != end (); )
149	if (i->expire <= ev_now ())
150	i = erase (i);
151	else
152	++i;
153	}
154	}	213	}
155		214
156	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
157		216
158	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
159	{	219	{
160	if (queue[i])	220	queue = new pkt [max_queue];
161	{
162	delete queue[i];
163	j = (j + 1) % QUEUEDEPTH;
164	}
165		221
166	queue[i] = p;
167
168	i = (i + 1) % QUEUEDEPTH;
169	}
170
171	net_packet *pkt_queue::get ()
172	{
173	net_packet *p = queue[j];
174
175	if (p)
176	{
177	queue[j] = 0;
178	j = (j + 1) % QUEUEDEPTH;
179	}
180
181	return p;
182	}
183
184	pkt_queue::pkt_queue ()
185	{
186	memset (queue, 0, sizeof (queue));
187	i = 0;	222	i = 0;
188	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
189	}	226	}
190		227
191	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
192	{	229	{
193	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
194	delete queue[i];	233	delete [] queue;
		234	}
		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
195	}	290	}
196		291
197	struct net_rateinfo	292	struct net_rateinfo
198	{	293	{
199	u32 host;	294	u32 host;
…		…
213		308
214	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	310	bool can (u32 host);
216	};	311	};
217		312
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		314
		315	bool
220	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
221	{	317	{
222	iterator i;	318	iterator i;
223		319
224	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
225	if (i->host == host)	321	if (i->host == host)
…		…
270	}	366	}
271	}	367	}
272		368
273	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
274		370
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	373	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
282		375
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	379	}
288		380
289	void	381	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	383	{
292	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		385	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	387	}
296		388
297	bool	389	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	391	{
300	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		393	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	395	}
304		396
		397	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	399	{
307	type = type_;	400	type = type_;
308		401
309	int src = THISNODE->id;	402	int src = THISNODE->id;
310		403
…		…
312	srcdst = ((src >> 8) << 4) | (dst >> 8);	405	srcdst = ((src >> 8) << 4) | (dst >> 8);
313	dst1 = dst;	406	dst1 = dst;
314	}	407	}
315		408
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		410
319	struct vpndata_packet : vpn_packet	411	struct vpndata_packet : vpn_packet
		412	{
		413	u32 ctr; // seqno
		414	u8 data[MAXVPNDATA];
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
320	{	421	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno	422	// the distance from beginning of packet to data member
322		423	return data - at (0);
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	424	}
		425	};
		426
		427	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		428	static unsigned char *
		429	expand_iv (u32 ctr)
		430	{
		431	static u32 iv[IV_SIZE (CIPHER) / 4];
		432
		433	require (sizeof (iv) == 4 * 4);
		434	require (IV_SIZE (CIPHER) % 4 == 0);
		435
		436	iv[0] =
		437	iv[1] =
		438	iv[2] = ctr;
		439
		440	// I would reuse ctr here to to avoid potential endianness issues,
		441	// but it seems openssl wraps around. While this would be still ok,
		442	// and I don't even know if its true, let's play safe and initialise
		443	// to 0.
		444	iv[3] = 0;
		445
		446	return (unsigned char *)iv;
		447	}
332		448
333	void	449	void
334	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	450	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
335	{	451	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	452	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	454	ptype type = PT_DATA_UNCOMPRESSED;
339		455
340	#if ENABLE_COMPRESSION	456	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	457	u8 cdata[MAX_MTU];
342		458
343	if (conn->features & ENABLE_COMPRESSION)	459	if (conn->features & FEATURE_COMPRESSION)
344	{	460	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	461	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		462
347	if (cl)	463	if (cl)
348	{	464	{
…		…
354	d[1] = cl;	470	d[1] = cl;
355	}	471	}
356	}	472	}
357	#endif	473	#endif
358		474
		475	ctr = htonl (seqno);
		476
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	477	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
360
361	struct {
362	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];
364	#endif
365	u32 seqno;
366	} datahdr;
367
368	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
371	#endif
372		478
373	require (EVP_EncryptUpdate (cctx,	479	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	480	(unsigned char *)data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	481	(unsigned char *)d, l));
376	outl += outl2;	482	outl += outl2;
377		483
378	require (EVP_EncryptUpdate (cctx,	484	// it seems this is a nop for us, but we do it anyways
379	(unsigned char *) data + outl, &outl2,	485	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
380	(unsigned char *) d, l));
381	outl += outl2;	486	outl += outl2;
382		487
383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
384	outl += outl2;
385
386	len = outl + data_hdr_size ();	488	len = data_hdr_size () + outl;
387		489
388	set_hdr (type, dst);	490	set_hdr (type, dst);
389		491
390	hmac_set (conn->octx);	492	hmac_set (conn->octx);
391	}	493	}
…		…
395	{	497	{
396	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	498	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
397	int outl = 0, outl2;	499	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	500	tap_packet *p = new tap_packet;
399	u8 *d;	501	u8 *d;
400	u32 l = len - data_hdr_size ();
401		502
		503	seqno = ntohl (ctr);
		504
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	505	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
403		506
404	#if ENABLE_COMPRESSION	507	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	508	u8 cdata[MAX_MTU];
406		509
407	if (type == PT_DATA_COMPRESSED)	510	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	511	d = cdata;
409	else	512	else
410	#endif	513	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	514	d = &(*p)[6 + 6];
412		515
413	/* this overwrites part of the src mac, but we fix that later */	516	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	518	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	520	outl += outl2;
418		521
		522	// it seems this is a nop for us, but we do it anyways
419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	523	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
420	outl += outl2;	524	outl += outl2;
421		525
422	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
423
424	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
425	id2mac (src (), p->src);	527	id2mac (src (), p->src);
426		528
427	#if ENABLE_COMPRESSION	529	#if ENABLE_COMPRESSION
428	if (type == PT_DATA_COMPRESSED)	530	if (type == PT_DATA_COMPRESSED)
429	{	531	{
430	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	532	u32 cl = (d[0] << 8) | d[1];
431		533
432	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	534	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
433	&(*p)[6 + 6], MAX_MTU)	535	&(*p)[6 + 6], MAX_MTU)
434	+ 6 + 6;	536	+ 6 + 6;
435	}	537	}
436	else	538	else
437	p->len = outl + (6 + 6 - DATAHDR);	539	p->len = outl + (6 + 6);
438	#endif	540	#endif
439		541
440	return p;	542	return p;
441	}	543	}
442		544
…		…
449	}	551	}
450	};	552	};
451		553
452	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
453	{	555	{
454	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
460		560
461	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
462	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		563
464	static u8 get_features ()	564	static u8 get_features ()
465	{	565	{
466	u8 f = 0;	566	u8 f = 0;
467	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
…		…
475	#endif	575	#endif
476	return f;	576	return f;
477	}	577	}
478	};	578	};
479		579
		580	void
480	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
481	{	582	{
482	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
483	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
484	randsize = RAND_SIZE;
485	hmaclen = HMACLENGTH;
486	flags = 0;	585	flags = 0;
487	challengelen = sizeof (rsachallenge);
488	features = get_features ();	586	features = get_features ();
489		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
490	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
491	digest_nid = htonl (EVP_MD_type (RSA_HASH));
492	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
493		593
494	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
495	set_hdr (type, dst);	595	set_hdr (type, dst);
496	}	596	}
497		597
498	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
499	{	600	{
500	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
501	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
502	else if (randsize != RAND_SIZE)	603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
503	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
504	else if (hmaclen != HMACLENGTH)
505	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
506	else if (challengelen != sizeof (rsachallenge))
507	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
508	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
509	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	605	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
510	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	606	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
511	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
512	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	607	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
513	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	608	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		609	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		610	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		611	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
514	else	613	else
		614	{
		615	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		616
		617	if (cmp > 0)
		618	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		619	conf->nodename, (const char *)rsi);
		620	else if (cmp == 0)
515	return true;	621	return true;
		622	}
516		623
517	return false;	624	return false;
518	}	625	}
519		626
520	struct auth_req_packet : config_packet	627	struct auth_req_packet : config_packet // UNPROTECTED
521	{	628	{
522	char magic[8];	629	char magic[8];
523	u8 initiate; // false if this is just an automatic reply	630	u8 initiate; // false if this is just an automatic reply
524	u8 protocols; // supported protocols (will be patched on forward)	631	u8 protocols; // supported protocols (will be patched on forward)
525	u8 pad2, pad3;	632	u8 pad2, pad3;
526	rsaid id;	633	auth_encr encr;
527	rsaencrdata encr;
528		634
529	auth_req_packet (int dst, bool initiate_, u8 protocols_)	635	auth_req_packet (int dst, bool initiate_, u8 protocols_)
530	{	636	{
531	config_packet::setup (PT_AUTH_REQ, dst);	637	config_packet::setup (PT_AUTH_REQ, dst);
532	strncpy (magic, MAGIC, 8);	638	memcpy (magic, MAGIC, 8);
533	initiate = !!initiate_;	639	initiate = !!initiate_;
534	protocols = protocols_;	640	protocols = protocols_;
535		641
536	len = sizeof (*this) - sizeof (net_packet);	642	len = sizeof (*this) - sizeof (net_packet);
537	}	643	}
538	};	644	};
539		645
540	struct auth_res_packet : config_packet	646	struct auth_res_packet : vpn_packet // UNPROTECTED
541	{	647	{
542	rsaid id;
543	u8 pad1, pad2, pad3;
544	u8 response_len; // encrypted length
545	rsaresponse response;	648	auth_response response;
546		649
547	auth_res_packet (int dst)	650	auth_res_packet (int dst)
548	{	651	{
549	config_packet::setup (PT_AUTH_RES, dst);	652	set_hdr (PT_AUTH_RES, dst);
550		653
551	len = sizeof (*this) - sizeof (net_packet);	654	len = sizeof (*this) - sizeof (net_packet);
552	}	655	}
553	};	656	};
554		657
…		…
584	};	687	};
585		688
586	/////////////////////////////////////////////////////////////////////////////	689	/////////////////////////////////////////////////////////////////////////////
587		690
588	void	691	void
589	connection::connection_established ()	692	connection::connection_established (const sockinfo &rsi)
590	{	693	{
591	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	694	if (!have_snd_auth || !have_rcv_auth)
		695	return;
592		696
593	if (ictx && octx)	697	si = rsi;
		698	protocol = rsi.prot;
		699
		700	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		701	conf->nodename, (const char *)rsi,
		702	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		703	PROTOCOL_MAJOR, prot_minor);
		704
		705	if (::conf.script_node_up)
		706	{
		707	run_script_cb *cb = new run_script_cb;
		708	cb->set<connection, &connection::script_node_up> (this);
		709	run_script_queued (cb, _("node-up command execution failed, continuing."));
594	{	710	}
595	connectmode = conf->connectmode;	711
		712	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		713	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
596		714
		715	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		716	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		717
597	// make sure rekeying timeouts are slightly asymmetric	718	// make sure rekeying timeouts are slightly asymmetric
598	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	719	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
599	rekey.start (rekey_interval, rekey_interval);	720	rekey.start (rekey_interval, rekey_interval);
		721
		722	hmac_error = 0.;
		723
600	keepalive.start (::conf.keepalive);	724	keepalive.start (::conf.keepalive);
601		725
602	// send queued packets	726	// send queued packets
603	if (ictx && octx)
604	{
605	while (tap_packet *p = (tap_packet *)data_queue.get ())	727	while (tap_packet *p = (tap_packet *)data_queue.get ())
606	{	728	{
607	send_data_packet (p);	729	if (p->len) send_data_packet (p);
608	delete p;	730	delete p;
609	}	731	}
610		732
611	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	733	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612	{	734	{
613	send_vpn_packet (p, si, IPTOS_RELIABILITY);	735	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
614	delete p;	736	delete p;
615	}
616	}
617	}	737	}
		738
		739	vpn->connection_established (this);
		740	}
		741
		742	void
		743	connection::reset_si ()
		744	{
		745	if (vpn->can_direct (THISNODE, conf))
		746	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
618	else	747	else
619	{	748	{
620	retry_cnt = 0;
621	establish_connection.start (5);
622	keepalive.stop ();
623	rekey.stop ();
624	}
625	}
626
627	void
628	connection::reset_si ()
629	{
630	protocol = best_protocol (THISNODE->protocols & conf->protocols);
631
632	// mask out protocols we cannot establish
633	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
634	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
635	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
636
637	if (protocol
638	&& (!conf->can_direct (THISNODE)
639	|| !THISNODE->can_direct (conf)))
640	{
641	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	749	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
642	protocol = 0;	750	protocol = 0;
643	}	751	}
644		752
645	si.set (conf, protocol);	753	si.set (conf, protocol);
646	}	754	}
…		…
649	const sockinfo &	757	const sockinfo &
650	connection::forward_si (const sockinfo &si) const	758	connection::forward_si (const sockinfo &si) const
651	{	759	{
652	if (!si.valid ())	760	if (!si.valid ())
653	{	761	{
654	connection *r = vpn->find_router ();	762	connection *r = vpn->find_router_for (this);
655		763
656	if (r)	764	if (r)
657	{	765	{
658	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	766	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659	conf->nodename, r->conf->nodename, (const char *)r->si);	767	conf->nodename, r->conf->nodename);
660	return r->si;	768	return r->si;
661	}	769	}
662	else	770	else
663	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	771	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
664	conf->nodename);	772	conf->nodename);
665	}	773	}
666		774
667	return si;	775	return si;
668	}	776	}
669		777
670	void	778	void
671	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	779	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
672	{	780	{
673	if (!vpn->send_vpn_packet (pkt, si, tos))	781	if (!vpn->send_vpn_packet (pkt, si, tos))
674	reset_connection ();	782	reset_connection ("packet send error");
675	}	783	}
676		784
677	void	785	void
678	connection::send_ping (const sockinfo &si, u8 pong)	786	connection::send_ping (const sockinfo &si, u8 pong)
679	{	787	{
680	ping_packet *pkt = new ping_packet;	788	ping_packet *pkt = new ping_packet;
681		789
682	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	790	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		791
		792	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
683	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	793	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684		794
685	delete pkt;	795	delete pkt;
686	}	796	}
687		797
…		…
702	void	812	void
703	connection::send_auth_request (const sockinfo &si, bool initiate)	813	connection::send_auth_request (const sockinfo &si, bool initiate)
704	{	814	{
705	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	815	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
706		816
707	rsachallenge chg;	817	generate_auth_data ();
708	rsa_cache.gen (pkt->id, chg);
709	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	818	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
710		819
711	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	820	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
712
713	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	821	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
714		822
715	delete pkt;	823	delete pkt;
716	}	824	}
717		825
718	void	826	void
719	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	827	connection::send_auth_response (const sockinfo &si)
720	{	828	{
721	auth_res_packet *pkt = new auth_res_packet (conf->id);	829	auth_res_packet *pkt = new auth_res_packet (conf->id);
722		830
723	pkt->id = id;	831	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		832	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
724		833
725	rsa_hash (id, chg, pkt->response);
726
727	pkt->hmac_set (octx);
728
729	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	834	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
730
731	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	835	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
732		836
733	delete pkt;	837	delete pkt;
734	}	838	}
735		839
736	void	840	void
737	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	841	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738	{	842	{
739	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	843	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
740	conf->id, rid, (const char *)rsi);	844	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		845	conf->protocols);
741		846
742	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	847	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
743		848
744	r->hmac_set (octx);	849	r->hmac_set (octx);
745	send_vpn_packet (r, si);	850	send_vpn_packet (r, si);
746		851
747	delete r;	852	delete r;
748	}	853	}
749		854
750	void	855	inline void
751	connection::establish_connection_cb (ev::timer &w, int revents)	856	connection::establish_connection_cb (ev::timer &w, int revents)
752	{	857	{
753	if (!ictx	858	if (!(ictx && octx)
754	&& conf != THISNODE	859	&& conf != THISNODE
755	&& connectmode != conf_node::C_NEVER	860	&& connectmode != conf_node::C_NEVER
756	&& connectmode != conf_node::C_DISABLED	861	&& connectmode != conf_node::C_DISABLED
757	&& !w.is_active ())	862	&& !w.is_active ())
758	{	863	{
		864	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		865	// and stop trying. should probably be handled by a per-connection expire handler.
		866	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		867	{
		868	reset_connection ("no demand");
		869	return;
		870	}
		871
		872	last_establish_attempt = ev_now ();
		873
759	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	874	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760	? (retry_cnt & 3) + 1	875	? (retry_cnt & 3) + 1
761	: 1 << (retry_cnt >> 2));	876	: 1 << (retry_cnt >> 2));
762		877
763	reset_si ();	878	reset_si ();
764		879
765	bool slow = si.prot & PROT_SLOW;	880	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
766		881
767	if (si.prot && !si.host)	882	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
768	{	883	{
769	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770	/*TODO*/ /* start the timer so we don't recurse endlessly */	884	/*TODO*/ /* start the timer so we don't recurse endlessly */
771	w.start (1);	885	w.start (1);
772	vpn->send_connect_request (conf->id);	886	vpn->send_connect_request (this);
773	}	887	}
774	else	888	else
775	{	889	{
776	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	890	if (si.valid ())
		891	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		892	conf->nodename, (const char *)si);
777		893
778	const sockinfo &dsi = forward_si (si);	894	const sockinfo &dsi = forward_si (si);
779		895
780	slow = slow || (dsi.prot & PROT_SLOW);	896	slow = slow || (dsi.prot & PROT_SLOW);
781		897
782	if (dsi.valid () && auth_rate_limiter.can (dsi))	898	if (dsi.valid () && auth_rate_limiter.can (dsi))
783	{	899	{
784	if (retry_cnt < 4)	900	// use ping after the first few retries
		901	// TODO: on rekeys, the other node might not interpret ping correctly,
		902	// TODO: as it will still have a valid connection
		903	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
785	send_auth_request (dsi, true);	904	send_auth_request (dsi, true);
786	else	905	else
787	send_ping (dsi, 0);	906	send_ping (dsi, 0);
788	}	907	}
789	}	908	}
790		909
791	retry_int *= slow ? 8. : 0.7;	910	retry_int *= slow ? 4. : 0.9;
792		911
793	if (retry_int < conf->max_retry)	912	if (retry_int < conf->max_retry)
794	retry_cnt++;	913	retry_cnt++;
795	else	914	else
796	retry_int = conf->max_retry;	915	retry_int = conf->max_retry;
…		…
798	w.start (retry_int);	917	w.start (retry_int);
799	}	918	}
800	}	919	}
801		920
802	void	921	void
803	connection::reset_connection ()	922	connection::reset_connection (const char *reason)
804	{	923	{
805	if (ictx && octx)	924	if (ictx && octx)
806	{	925	{
807	slog (L_INFO, _("%s(%s): connection lost"),	926	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	927	conf->nodename, (const char *)si, reason);
809		928
810	if (::conf.script_node_down)	929	if (::conf.script_node_down)
811	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	930	{
		931	run_script_cb *cb = new run_script_cb;
		932	cb->set<connection, &connection::script_node_down> (this);
812	slog (L_WARN, _("node-down command execution failed, continuing."));	933	run_script_queued (cb, _("node-down command execution failed, continuing."));
		934	}
813	}	935	}
814		936
815	delete ictx; ictx = 0;	937	delete ictx; ictx = 0;
816	delete octx; octx = 0;	938	delete octx; octx = 0;
817	#if ENABLE_DNS
818	dnsv4_reset_connection ();
819	#endif
820		939
821	si.host = 0;	940	si.host = 0;
822		941
		942	have_snd_auth = false;
		943	have_rcv_auth = false;
		944	auth_expire = 0.;
		945
823	last_activity = 0;	946	last_activity = 0.;
		947	//last_si_change = 0.;
824	retry_cnt = 0;	948	retry_cnt = 0;
825		949
826	rekey.stop ();	950	rekey.stop ();
827	keepalive.stop ();	951	keepalive.stop ();
828	establish_connection.stop ();	952	establish_connection.stop ();
…		…
832	connection::shutdown ()	956	connection::shutdown ()
833	{	957	{
834	if (ictx && octx)	958	if (ictx && octx)
835	send_reset (si);	959	send_reset (si);
836		960
837	reset_connection ();	961	reset_connection ("shutdown");
838	}	962	}
839		963
840	void	964	// poor-man's rekeying
		965	inline void
841	connection::rekey_cb (ev::timer &w, int revents)	966	connection::rekey_cb (ev::timer &w, int revents)
842	{	967	{
843	reset_connection ();	968	reset_connection ("rekeying");
844	establish_connection ();	969	establish_connection ();
845	}	970	}
846		971
847	void	972	void
848	connection::send_data_packet (tap_packet *pkt)	973	connection::send_data_packet (tap_packet *pkt)
…		…
862	if (oseqno > MAX_SEQNO)	987	if (oseqno > MAX_SEQNO)
863	rekey ();	988	rekey ();
864	}	989	}
865		990
866	void	991	void
		992	connection::post_inject_queue ()
		993	{
		994	// force a connection every now and when when packets are sent (max 1/s)
		995	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		996	establish_connection.stop ();
		997
		998	establish_connection ();
		999	}
		1000
		1001	void
867	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1002	connection::inject_data_packet (tap_packet *pkt)
868	{	1003	{
869	if (ictx && octx)	1004	if (ictx && octx)
870	send_data_packet (pkt);	1005	send_data_packet (pkt);
871	else	1006	else
872	{	1007	{
873	if (!broadcast)
874	data_queue.put (new tap_packet (*pkt));	1008	data_queue.put (new tap_packet (*pkt));
875		1009	post_inject_queue ();
876	establish_connection ();
877	}	1010	}
878	}	1011	}
879		1012
		1013	void
880	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1014	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
881	{	1015	{
882	if (ictx && octx)	1016	if (ictx && octx)
883	send_vpn_packet (pkt, si, tos);	1017	send_vpn_packet (pkt, si, tos);
884	else	1018	else
885	{	1019	{
886	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1020	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
887		1021	post_inject_queue ();
888	establish_connection ();
889	}	1022	}
890	}	1023	}
891		1024
892	void	1025	void
893	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1026	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
894	{	1027	{
895	last_activity = ev_now ();	1028	last_activity = ev_now ();
896		1029
897	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1030	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
898	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1031	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
899		1032
900	if (connectmode == conf_node::C_DISABLED)	1033	if (connectmode == conf_node::C_DISABLED)
901	return;	1034	return;
902		1035
903	switch (pkt->typ ())	1036	switch (pkt->typ ())
904	{	1037	{
905	case vpn_packet::PT_PING:	1038	case vpn_packet::PT_PING:
		1039	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1040
906	// we send pings instead of auth packets after some retries,	1041	// we send pings instead of auth packets after some retries,
907	// so reset the retry counter and establish a connection	1042	// so reset the retry counter and establish a connection
908	// when we receive a ping.	1043	// when we receive a ping.
909	if (!ictx)	1044	if (!ictx)
910	{	1045	{
911	if (auth_rate_limiter.can (rsi))	1046	if (auth_rate_limiter.can (rsi))
912	send_auth_request (rsi, true);	1047	send_auth_request (rsi, true);
913	}	1048	}
914	else	1049	else
		1050	// we would love to change the socket address here, but ping's aren't
		1051	// authenticated, so we best ignore it.
915	send_ping (rsi, 1); // pong	1052	send_ping (rsi, 1); // pong
916		1053
917	break;	1054	break;
918		1055
919	case vpn_packet::PT_PONG:	1056	case vpn_packet::PT_PONG:
		1057	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1058
		1059	// a PONG might mean that the other side doesn't really know
		1060	// about our desire for communication.
		1061	establish_connection ();
920	break;	1062	break;
921		1063
922	case vpn_packet::PT_RESET:	1064	case vpn_packet::PT_RESET:
		1065	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1066
		1067	if (ictx && octx)
923	{	1068	{
924	reset_connection ();	1069	reset_connection ("remote reset");
925		1070
926	config_packet *p = (config_packet *) pkt;	1071	config_packet *p = (config_packet *) pkt;
927		1072
928	if (!p->chk_config ())	1073	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
929	{
930	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
931	conf->nodename, (const char *)rsi);
932	connectmode = conf_node::C_DISABLED;
933	}
934	else if (connectmode == conf_node::C_ALWAYS)
935	establish_connection ();	1074	establish_connection ();
936	}	1075	}
		1076
937	break;	1077	break;
938		1078
939	case vpn_packet::PT_AUTH_REQ:	1079	case vpn_packet::PT_AUTH_REQ:
940	if (auth_rate_limiter.can (rsi))	1080	if (auth_rate_limiter.can (rsi))
941	{	1081	{
942	auth_req_packet *p = (auth_req_packet *) pkt;	1082	auth_req_packet *p = (auth_req_packet *)pkt;
943		1083
944	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1084	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1085	conf->nodename, p->initiate ? "initiate" : "reply",
		1086	p->protocols, p->features);
945		1087
946	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1088	if (memcmp (p->magic, MAGIC, 8))
		1089	{
		1090	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1091	conf->nodename, (const char *)rsi);
		1092	}
		1093	else if (p->chk_config (conf, rsi))
947	{	1094	{
948	if (p->prot_minor != PROTOCOL_MINOR)	1095	if (p->prot_minor != PROTOCOL_MINOR)
949	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1096	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
950	conf->nodename, (const char *)rsi,	1097	conf->nodename, (const char *)rsi,
951	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1098	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
952		1099
953	if (p->initiate)	1100	if (p->initiate)
		1101	{
954	send_auth_request (rsi, false);	1102	send_auth_request (rsi, false);
955		1103
956	rsachallenge k;	1104	if (ictx && octx)
		1105	reset_connection ("reconnect");
		1106	}
957		1107
		1108	auth_data auth;
		1109
958	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1110	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
959	{	1111	{
960	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1112	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
961	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1113	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
962	break;
963	}	1114	}
964	else	1115	else
965	{	1116	{
966	delete octx;	1117	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
967		1118
968	octx = new crypto_ctx (k, 1);	1119	rcv_auth = auth;
969	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1120	have_rcv_auth = true;
970		1121
		1122	send_auth_response (rsi);
		1123
		1124	if (chg)
		1125	{
971	conf->protocols = p->protocols;	1126	conf->protocols = p->protocols;
972	features = p->features & config_packet::get_features ();	1127	features = p->features & config_packet::get_features ();
973		1128
974	send_auth_response (rsi, p->id, k);
975
976	connection_established ();	1129	connection_established (rsi);
977
978	break;	1130	}
979	}	1131	}
		1132
		1133	break;
980	}	1134	}
981	else
982	slog (L_WARN, _("%s(%s): protocol mismatch"),
983	conf->nodename, (const char *)rsi);
984		1135
985	send_reset (rsi);	1136	send_reset (rsi);
986	}	1137	}
987		1138
988	break;	1139	break;
989		1140
990	case vpn_packet::PT_AUTH_RES:	1141	case vpn_packet::PT_AUTH_RES:
991	{	1142	{
992	auth_res_packet *p = (auth_res_packet *) pkt;	1143	auth_res_packet *p = (auth_res_packet *)pkt;
993		1144
994	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1145	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
995		1146
996	if (p->chk_config ())	1147	auth_mac local_mac;
		1148	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1149
		1150	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
997	{	1151	{
998	if (p->prot_minor != PROTOCOL_MINOR)
999	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1000	conf->nodename, (const char *)rsi,
1001	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1002
1003	rsachallenge chg;
1004
1005	if (!rsa_cache.find (p->id, chg))
1006	{
1007	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1152	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1008	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
1009	break;
1010	}	1154	}
1011	else	1155	else if (!have_snd_auth)
1012	{	1156	{
1013	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1157	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1014		1158
1015	if (!p->hmac_chk (cctx))	1159	have_snd_auth = true;
1016	{
1017	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1018	"could be an attack, or just corruption or a synchronization error"),
1019	conf->nodename, (const char *)rsi);
1020	break;
1021	}
1022	else
1023	{
1024	rsaresponse h;
1025
1026	rsa_hash (p->id, chg, h);
1027
1028	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1029	{
1030	prot_minor = p->prot_minor;
1031
1032	delete ictx; ictx = cctx;
1033
1034	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1035
1036	si = rsi;
1037	protocol = rsi.prot;
1038
1039	connection_established ();	1160	connection_established (rsi);
1040
1041	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1042	conf->nodename, (const char *)rsi,
1043	p->prot_major, p->prot_minor);
1044
1045	if (::conf.script_node_up)
1046	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1047	slog (L_WARN, _("node-up command execution failed, continuing."));
1048
1049	break;
1050	}
1051	else
1052	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1053	conf->nodename, (const char *)rsi);
1054	}
1055
1056	delete cctx;
1057	}
1058	}	1161	}
1059	}	1162	}
1060
1061	send_reset (rsi);
1062	break;	1163	break;
1063		1164
1064	case vpn_packet::PT_DATA_COMPRESSED:	1165	case vpn_packet::PT_DATA_COMPRESSED:
1065	#if !ENABLE_COMPRESSION	1166	#if !ENABLE_COMPRESSION
1066	send_reset (rsi);	1167	send_reset (rsi);
…		…
1072	if (ictx && octx)	1173	if (ictx && octx)
1073	{	1174	{
1074	vpndata_packet *p = (vpndata_packet *)pkt;	1175	vpndata_packet *p = (vpndata_packet *)pkt;
1075		1176
1076	if (!p->hmac_chk (ictx))	1177	if (!p->hmac_chk (ictx))
		1178	{
		1179	// rekeying often creates temporary hmac auth floods
		1180	// we assume they don't take longer than a few seconds normally,
		1181	// and suppress messages and resets during that time.
		1182	//TODO: should be done per source address
		1183	if (!hmac_error)
		1184	{
		1185	hmac_error = ev_now () + 3;
		1186	break;
		1187	}
		1188	else if (hmac_error >= ev_now ())
		1189	break; // silently suppress
		1190	else
		1191	{
1077	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1192	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1078	"could be an attack, or just corruption or a synchronization error"),	1193	"could be an attack, or just corruption or a synchronization error."),
1079	conf->nodename, (const char *)rsi);	1194	conf->nodename, (const char *)rsi);
		1195	// reset
		1196	}
		1197	}
1080	else	1198	else
1081	{	1199	{
1082	u32 seqno;	1200	u32 seqno;
1083	tap_packet *d = p->unpack (this, seqno);	1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
1084		1203
1085	if (iseqno.recv_ok (seqno))	1204	hmac_error = 0;
		1205
		1206	if (seqclass == 0) // ok
1086	{	1207	{
1087	vpn->tap->send (d);	1208	vpn->tap->send (d);
1088		1209
1089	if (si != rsi)	1210	if (si != rsi)
1090	{	1211	{
1091	// fast re-sync on source address changes, useful especially for tcp/ip	1212	// fast re-sync on source address changes, useful especially for tcp/ip
		1213	//if (last_si_change < ev_now () + 5.)
1092	si = rsi;	1214	// {
1093
1094	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1215	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1095	conf->nodename, (const char *)si, (const char *)rsi);	1216	conf->nodename, (const char *)si, (const char *)rsi);
		1217
		1218	si = rsi;
		1219
		1220	if (::conf.script_node_change)
		1221	{
		1222	run_script_cb *cb = new run_script_cb;
		1223	cb->set<connection, &connection::script_node_change> (this);
		1224	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1225	}
		1226
		1227	// }
		1228	//else
		1229	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1230	// conf->nodename, (const char *)si, (const char *)rsi);
1096	}	1231	}
		1232	}
		1233	else if (seqclass == 1) // far history
		1234	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1235	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1236	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1237	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1238	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1239	else if (seqclass == 3) // reset
		1240	{
		1241	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1242	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1243	send_reset (rsi);
1097	}	1244	}
1098		1245
1099	delete d;	1246	delete d;
1100	break;	1247	break;
1101	}	1248	}
…		…
1105	break;	1252	break;
1106		1253
1107	case vpn_packet::PT_CONNECT_REQ:	1254	case vpn_packet::PT_CONNECT_REQ:
1108	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1255	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1109	{	1256	{
1110	connect_req_packet *p = (connect_req_packet *) pkt;	1257	connect_req_packet *p = (connect_req_packet *)pkt;
1111		1258
1112	if (p->id > 0 && p->id <= vpn->conns.size ())	1259	if (p->id > 0 && p->id <= vpn->conns.size ())
1113	{	1260	{
1114	connection *c = vpn->conns[p->id - 1];	1261	connection *c = vpn->conns[p->id - 1];
1115	conf->protocols = p->protocols;	1262	conf->protocols = p->protocols;
1116		1263
1117	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1264	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1265	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1266	p->protocols,
1118	conf->id, p->id, c->ictx && c->octx);	1267	c->ictx && c->octx);
1119		1268
1120	if (c->ictx && c->octx)	1269	if (c->ictx && c->octx)
1121	{	1270	{
1122	// send connect_info packets to both sides, in case one is	1271	// send connect_info packets to both sides, in case one is
1123	// behind a nat firewall (or both ;)	1272	// behind a nat firewall (or both ;)
…		…
1146		1295
1147	c->conf->protocols = p->protocols;	1296	c->conf->protocols = p->protocols;
1148	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1297	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1149	p->si.upgrade_protocol (protocol, c->conf);	1298	p->si.upgrade_protocol (protocol, c->conf);
1150		1299
1151	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1300	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1152	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1301	conf->nodename,
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si,
		1304	p->protocols,
		1305	protocol,
		1306	p->si.supported_protocols (c->conf),
		1307	!c->ictx && !c->octx);
1153		1308
1154	const sockinfo &dsi = forward_si (p->si);	1309	const sockinfo &dsi = forward_si (p->si);
1155		1310
1156	if (dsi.valid ())	1311	if (dsi.valid ())
1157	c->send_auth_request (dsi, true);	1312	c->send_auth_request (dsi, true);
		1313	else
		1314	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1315	vpn->conns[p->id - 1]->conf->nodename,
		1316	(const char *)p->si);
1158	}	1317	}
1159	else	1318	else
1160	slog (L_WARN,	1319	slog (L_WARN,
1161	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1320	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1162	p->id);	1321	p->id);
…		…
1168	send_reset (rsi);	1327	send_reset (rsi);
1169	break;	1328	break;
1170	}	1329	}
1171	}	1330	}
1172		1331
		1332	inline void
1173	void connection::keepalive_cb (ev::timer &w, int revents)	1333	connection::keepalive_cb (ev::timer &w, int revents)
1174	{	1334	{
1175	if (ev_now () >= last_activity + ::conf.keepalive + 30)	1335	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1336
		1337	if (when >= 0)
		1338	w.start (when);
		1339	else if (when < -15)
1176	{	1340	{
1177	reset_connection ();	1341	reset_connection ("keepalive overdue");
1178	establish_connection ();	1342	establish_connection ();
1179	}	1343	}
1180	else if (ev_now () < last_activity + ::conf.keepalive)
1181	w.start (last_activity + ::conf.keepalive - ev::now ());
1182	else if (conf->connectmode != conf_node::C_ONDEMAND	1344	else if (conf->connectmode != conf_node::C_ONDEMAND
1183	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1345	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1184	{	1346	{
		1347	w.start (3);
1185	send_ping (si);	1348	send_ping (si);
1186	w.start (5);
1187	}	1349	}
1188	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1350	else if (when >= -10)
1189	// hold ondemand connections implicitly a few seconds longer	1351	// hold ondemand connections implicitly a few seconds longer
1190	// should delete octx, though, or something like that ;)	1352	// should delete octx, though, or something like that ;)
1191	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1353	w.start (when + 10);
1192	else	1354	else
1193	reset_connection ();	1355	reset_connection ("keepalive timeout");
1194	}	1356	}
1195		1357
		1358	void
1196	void connection::send_connect_request (int id)	1359	connection::send_connect_request (int id)
1197	{	1360	{
1198	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1361	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1199		1362
1200	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1363	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1364	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1365	THISNODE->protocols);
1201	p->hmac_set (octx);	1366	p->hmac_set (octx);
1202	send_vpn_packet (p, si);	1367	send_vpn_packet (p, si);
1203		1368
1204	delete p;	1369	delete p;
1205	}	1370	}
1206		1371
		1372	void
1207	void connection::script_init_env (const char *ext)	1373	connection::script_init_env (const char *ext)
1208	{	1374	{
1209	char *env;	1375	char *env;
1210	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1376	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1211	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1377	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1212	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1378	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1213	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1379	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1214	conf->id & 0xff); putenv (env);	1380	conf->id & 0xff); putenv (env);
1215	}	1381	}
1216		1382
		1383	void
1217	void connection::script_init_connect_env ()	1384	connection::script_init_connect_env ()
1218	{	1385	{
1219	vpn->script_init_env ();	1386	vpn->script_init_env ();
1220		1387
1221	char *env;	1388	char *env;
1222	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1389	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1390	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1223	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1391	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1224	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1392	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1225	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1393	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1226	}	1394	}
1227		1395
		1396	inline const char *
1228	const char *connection::script_node_up ()	1397	connection::script_node_up ()
1229	{	1398	{
1230	script_init_connect_env ();	1399	script_init_connect_env ();
1231		1400
1232	putenv ((char *)"STATE=up");	1401	putenv ((char *)"STATE=up");
1233		1402
…		…
1238	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1407	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1239		1408
1240	return filename;	1409	return filename;
1241	}	1410	}
1242		1411
		1412	inline const char *
		1413	connection::script_node_change ()
		1414	{
		1415	script_init_connect_env ();
		1416
		1417	putenv ((char *)"STATE=change");
		1418
		1419	char *filename;
		1420	asprintf (&filename,
		1421	"%s/%s",
		1422	confbase,
		1423	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1424
		1425	return filename;
		1426	}
		1427
		1428	inline const char *
1243	const char *connection::script_node_down ()	1429	connection::script_node_down ()
1244	{	1430	{
1245	script_init_connect_env ();	1431	script_init_connect_env ();
1246		1432
1247	putenv ((char *)"STATE=down");	1433	putenv ((char *)"STATE=down");
1248		1434
…		…
1254		1440
1255	return filename;	1441	return filename;
1256	}	1442	}
1257		1443
1258	connection::connection (struct vpn *vpn, conf_node *conf)	1444	connection::connection (struct vpn *vpn, conf_node *conf)
1259	: vpn(vpn), conf(conf)	1445	: vpn(vpn), conf(conf),
1260	, rekey (this, &connection::rekey_cb)
1261	, keepalive (this, &connection::keepalive_cb)
1262	, establish_connection (this, &connection::establish_connection_cb)
1263	#if ENABLE_DNS	1446	#if ENABLE_DNS
1264	, dns (0)	1447	dns (0),
1265	#endif	1448	#endif
		1449	data_queue(conf->max_ttl, conf->max_queue + 1),
		1450	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1266	{	1451	{
		1452	rekey .set<connection, &connection::rekey_cb > (this);
		1453	keepalive .set<connection, &connection::keepalive_cb > (this);
		1454	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1455
		1456	last_establish_attempt = 0.;
1267	octx = ictx = 0;	1457	octx = ictx = 0;
1268	retry_cnt = 0;
1269		1458
1270	if (!conf->protocols) // make sure some protocol is enabled	1459	connectmode = conf->connectmode;
1271	conf->protocols = PROT_UDPv4;
1272		1460
1273	connectmode = conf_node::C_ALWAYS; // initial setting	1461	// queue a dummy packet to force an initial connection attempt
		1462	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1463	vpn_queue.put (new net_packet);
		1464
1274	reset_connection ();	1465	reset_connection ("startup");
1275	}	1466	}
1276		1467
1277	connection::~connection ()	1468	connection::~connection ()
1278	{	1469	{
1279	shutdown ();	1470	shutdown ();
1280	}	1471	}
1281		1472
		1473	void
1282	void connection_init ()	1474	connection_init ()
1283	{	1475	{
1284	auth_rate_limiter.clear ();	1476	auth_rate_limiter.clear ();
1285	reset_rate_limiter.clear ();	1477	reset_rate_limiter.clear ();
1286	}	1478	}
1287		1479

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