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Comparing gvpe/src/connection.C (file contents):
Revision 1.56 by pcg, Fri Jun 3 05:07:31 2005 UTC vs.
Revision 1.105 by root, Fri Jul 19 18:22:54 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 <cassert>
25
26	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
27		37
28	#include <openssl/rand.h>	38	#include <openssl/rand.h>
29	#include <openssl/evp.h>	39	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
31	#include <openssl/err.h>	41	#include <openssl/err.h>
…		…
33	#include "conf.h"	43	#include "conf.h"
34	#include "slog.h"	44	#include "slog.h"
35	#include "device.h"	45	#include "device.h"
36	#include "vpn.h"	46	#include "vpn.h"
37	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
38		49
39	#include "netcompat.h"	50	#include "netcompat.h"
40		51
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
46		54
47	#define ULTRA_FAST 1	55	#define ULTRA_FAST 1
48	#define HLOG 15	56	#define HLOG 15
49	#include "lzf/lzf.h"	57	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	58	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	59	#include "lzf/lzf_d.c"
52		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb *cb, const char *warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
		104
53	struct crypto_ctx	105	struct crypto_ctx
54	{	106	{
55	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	108	HMAC_CTX hctx;
57		109
58	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	111	~crypto_ctx ();
60	};	112	};
61		113
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
64	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	146	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	147	}
69		148
70	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
71	{	150	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
74	}	153	}
75		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
76	static void	182	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	184	{
79	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
80		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	189	}
88		190
89	struct rsa_entry {	191	void
90	tstamp expire;	192	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	193	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{	195	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	196	// request data
104	{	197	rand_fill (snd_auth.rsa);
105	memcpy (&chg, &i->chg, sizeof chg);	198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
106		199
107	erase (i);	200	// eventual response data
108	return true;	201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
109	}
110	}	202	}
111		203
112	if (cleaner.at < NOW)	204	// every use prolongs the expiry
113	cleaner.start (NOW + RSA_TTL);	205	auth_expire = ev_now () + AUTH_TTL;
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }
138
139	} rsa_cache;
140
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{
145	w.start (NOW + RSA_TTL);
146
147	for (iterator i = begin (); i != end (); )
148	if (i->expire <= NOW)
149	i = erase (i);
150	else
151	++i;
152	}
153	}	206	}
154		207
155	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
156		209
157	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
158	{	212	{
159	if (queue[i])	213	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		214
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	215	i = 0;
187	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	219	}
189		220
190	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
191	{	222	{
192	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
193	delete queue[i];	226	delete [] queue;
194	}	227	}
195		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
196	struct net_rateinfo {	285	struct net_rateinfo
		286	{
197	u32 host;	287	u32 host;
198	double pcnt, diff;	288	double pcnt, diff;
199	tstamp last;	289	tstamp last;
200	};	290	};
201		291
…		…
211		301
212	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	303	bool can (u32 host);
214	};	304	};
215		305
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		307
		308	bool
218	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
219	{	310	{
220	iterator i;	311	iterator i;
221		312
222	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
223	if (i->host == host)	314	if (i->host == host)
224	break;	315	break;
225	else if (i->last < NOW - NRL_EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	317	i = erase (i);
227	else	318	else
228	i++;	319	i++;
229		320
230	if (i == end ())	321	if (i == end ())
…		…
232	net_rateinfo ri;	323	net_rateinfo ri;
233		324
234	ri.host = host;	325	ri.host = host;
235	ri.pcnt = 1.;	326	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	327	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	328	ri.last = ev_now ();
238		329
239	push_front (ri);	330	push_front (ri);
240		331
241	return true;	332	return true;
242	}	333	}
…		…
244	{	335	{
245	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
246	erase (i);	337	erase (i);
247		338
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		341
251	ri.last = NOW;	342	ri.last = ev_now ();
252		343
253	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
254		345
255	bool send = dif > NRL_CUTOFF;	346	bool send = dif > NRL_CUTOFF;
256		347
…		…
268	}	359	}
269	}	360	}
270		361
271	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
272		363
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	366	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
280		368
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	372	}
286		373
287	void	374	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	376	{
290	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		378	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	380	}
294		381
295	bool	382	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	384	{
298	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		386	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	388	}
302		389
		390	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	392	{
305	type = type_;	393	type = type_;
306		394
307	int src = THISNODE->id;	395	int src = THISNODE->id;
308		396
…		…
313		401
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		404
317	struct vpndata_packet : vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		410	tap_packet *unpack (connection *conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
318	{	414	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	416	}
		417	};
330		418
331	void	419	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	421	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
337		425
338	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
340		428
341	if (conn->features & ENABLE_COMPRESSION)	429	if (conn->features & FEATURE_COMPRESSION)
342	{	430	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		432
345	if (cl)	433	if (cl)
346	{	434	{
…		…
352	d[1] = cl;	440	d[1] = cl;
353	}	441	}
354	}	442	}
355	#endif	443	#endif
356		444
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		446
359	struct {	447	struct {
360	#if RAND_SIZE	448	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
362	#endif	450	#endif
363	u32 seqno;	451	u32 seqno;
364	} datahdr;	452	} datahdr;
365		453
366	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	455	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	459	#endif
370		460
371	require (EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	463	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	485	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
397	u8 *d;	487	u8 *d;
398	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
399		489
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		491
402	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
404		494
405	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	496	d = cdata;
407	else	497	else
408	#endif	498	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
410		500
411	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	509	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	510	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	511	outl += outl2;
416		512
…		…
447	}	543	}
448	};	544	};
449		545
450	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
451	{	547	{
452	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
458		552
459	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
460	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		555
462	static u8 get_features ()	556	static u8 get_features ()
463	{	557	{
464	u8 f = 0;	558	u8 f = 0;
465	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	560	f |= FEATURE_COMPRESSION;
467	#endif	561	#endif
468	#if ENABLE_ROHC	562	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	563	f |= FEATURE_ROHC;
470	#endif	564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
471	return f;	568	return f;
472	}	569	}
473	};	570	};
474		571
		572	void
475	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
476	{	574	{
477	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;
481	flags = 0;	578	flags = 0;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	579	features = get_features ();
484		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		586
489	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	588	set_hdr (type, dst);
491	}	589	}
492		590
493	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	593	{
495	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	else if (challengelen != sizeof (rsachallenge))
502	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
503	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
504	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
505	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
506	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
507	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
508	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
509	else	609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
510	return true;	617	return true;
		618	}
511		619
512	return false;	620	return false;
513	}	621	}
514		622
515	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
516	{	624	{
517	char magic[8];	625	char magic[8];
518	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
519	u8 protocols; // supported protocols (will be patched on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
520	u8 pad2, pad3;	628	u8 pad2, pad3;
521	rsaid id;	629	auth_encr encr;
522	rsaencrdata encr;
523		630
524	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
525	{	632	{
526	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
527	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
528	initiate = !!initiate_;	635	initiate = !!initiate_;
529	protocols = protocols_;	636	protocols = protocols_;
530		637
531	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
532	}	639	}
533	};	640	};
534		641
535	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
536	{	643	{
537	rsaid id;
538	u8 pad1, pad2, pad3;
539	u8 response_len; // encrypted length
540	rsaresponse response;	644	auth_response response;
541		645
542	auth_res_packet (int dst)	646	auth_res_packet (int dst)
543	{	647	{
544	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
545		649
546	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
547	}	651	}
548	};	652	};
549		653
…		…
579	};	683	};
580		684
581	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
582		686
583	void	687	void
584	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
585	{	689	{
		690	if (!have_snd_auth || !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
586	if (ictx && octx)	723	if (ictx && octx)
587	{	724	{
588	connectmode = conf->connectmode;	725	while (tap_packet *p = (tap_packet *)data_queue.get ())
589
590	// make sure rekeying timeouts are slightly asymmetric
591	rekey.start (NOW + ::conf.rekey
592	+ (conf->id > THISNODE->id ? 10 : 0));
593	keepalive.start (NOW + ::conf.keepalive);
594
595	// send queued packets
596	if (ictx && octx)
597	{	726	{
598	while (tap_packet *p = (tap_packet *)data_queue.get ())
599	{
600	send_data_packet (p);	727	if (p->len) send_data_packet (p);
601	delete p;	728	delete p;
602	}
603
604	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
605	{
606	send_vpn_packet (p, si, IPTOS_RELIABILITY);
607	delete p;
608	}
609	}	729	}
		730
		731	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
610	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
611	else	746	else
612	{	747	{
613	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
614	establish_connection.start (NOW + 5);	749	protocol = 0;
615	keepalive.stop ();
616	rekey.stop ();
617	}	750	}
618	}
619
620	void
621	connection::reset_si ()
622	{
623	protocol = best_protocol (THISNODE->protocols & conf->protocols);
624
625	// mask out protocols we cannot establish
626	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
627	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
628	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
629		751
630	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
631	}	755	}
632		756
633	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
634	const sockinfo &	758	const sockinfo &
635	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
636	{	760	{
637	if (!si.valid ())	761	if (!si.valid ())
638	{	762	{
639	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
640		764
641	if (r)	765	if (r)
642	{	766	{
643	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
644	conf->nodename, r->conf->nodename, (const char *)r->si);	768	conf->nodename, r->conf->nodename);
645	return r->si;	769	return r->si;
646	}	770	}
647	else	771	else
648	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
649	conf->nodename);	773	conf->nodename);
650	}	774	}
651		775
652	return si;	776	return si;
653	}	777	}
…		…
663	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
664	{	788	{
665	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
666		790
667	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
668	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
669		795
670	delete pkt;	796	delete pkt;
671	}	797	}
672		798
…		…
687	void	813	void
688	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
689	{	815	{
690	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
691		817
692	rsachallenge chg;	818	generate_auth_data ();
693	rsa_cache.gen (pkt->id, chg);
694	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
695		820
696	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
697
698	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
699		823
700	delete pkt;	824	delete pkt;
701	}	825	}
702		826
703	void	827	void
704	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
705	{	829	{
706	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
707		831
708	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
709		834
710	rsa_hash (id, chg, pkt->response);
711
712	pkt->hmac_set (octx);
713
714	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
715
716	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
717		837
718	delete pkt;	838	delete pkt;
719	}	839	}
720		840
721	void	841	void
722	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
723	{	843	{
724	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
725	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
726		847
727	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
728		849
729	r->hmac_set (octx);	850	r->hmac_set (octx);
730	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
731		852
732	delete r;	853	delete r;
733	}	854	}
734		855
735	void	856	inline void
736	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
737	{	858	{
738	if (!ictx	859	if (!(ictx && octx)
739	&& conf != THISNODE	860	&& conf != THISNODE
740	&& connectmode != conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
741	&& connectmode != conf_node::C_DISABLED	862	&& connectmode != conf_node::C_DISABLED
742	&& NOW > w.at)	863	&& !w.is_active ())
743	{	864	{
744	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		866	// and stop trying. should probably be handled by a per-connection expire handler.
		867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
		870	return;
		871	}
745		872
746	double retry_int = double (retry_cnt & 3	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
747	? (retry_cnt & 3) + 1	876	? (retry_cnt & 3) + 1
748	: 1 << (retry_cnt >> 2));	877	: 1 << (retry_cnt >> 2));
749		878
750	reset_si ();	879	reset_si ();
751		880
752	bool slow = si.prot & PROT_SLOW;	881	bool slow = si.prot & PROT_SLOW;
753		882
754	if (si.prot && !si.host)	883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/*TODO*/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
755	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
756	else	889	else
757	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
758	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
759		896
760	slow = slow || (dsi.prot & PROT_SLOW);	897	slow = slow || (dsi.prot & PROT_SLOW);
761		898
762	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
…		…
766	else	903	else
767	send_ping (dsi, 0);	904	send_ping (dsi, 0);
768	}	905	}
769	}	906	}
770		907
771	retry_int *= slow ? 8. : 0.7;	908	retry_int *= slow ? 8. : 0.9;
772		909
773	if (retry_int < conf->max_retry)	910	if (retry_int < conf->max_retry)
774	retry_cnt++;	911	retry_cnt++;
775	else	912	else
776	retry_int = conf->max_retry;	913	retry_int = conf->max_retry;
777		914
778	w.start (NOW + retry_int);	915	w.start (retry_int);
779	}	916	}
780	}	917	}
781		918
782	void	919	void
783	connection::reset_connection ()	920	connection::reset_connection ()
…		…
786	{	923	{
787	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
788	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
789		926
790	if (::conf.script_node_down)	927	if (::conf.script_node_down)
791	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
792	slog (L_WARN, _("node-down command execution failed, continuing."));	931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
793	}	933	}
794		934
795	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
796	delete octx; octx = 0;	936	delete octx; octx = 0;
797	#if ENABLE_DNS
798	dnsv4_reset_connection ();
799	#endif
800		937
801	si.host = 0;	938	si.host = 0;
802		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
803	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
804	retry_cnt = 0;	946	retry_cnt = 0;
805		947
806	rekey.stop ();	948	rekey.stop ();
807	keepalive.stop ();	949	keepalive.stop ();
808	establish_connection.stop ();	950	establish_connection.stop ();
…		…
815	send_reset (si);	957	send_reset (si);
816		958
817	reset_connection ();	959	reset_connection ();
818	}	960	}
819		961
820	void	962	// poor-man's rekeying
821	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
822	{	965	{
823	reset_connection ();	966	reset_connection ();
824	establish_connection ();	967	establish_connection ();
825	}	968	}
826		969
…		…
842	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
843	rekey ();	986	rekey ();
844	}	987	}
845		988
846	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
847	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1000	connection::inject_data_packet (tap_packet *pkt)
848	{	1001	{
849	if (ictx && octx)	1002	if (ictx && octx)
850	send_data_packet (pkt);	1003	send_data_packet (pkt);
851	else	1004	else
852	{	1005	{
853	if (!broadcast)
854	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
855		1007	post_inject_queue ();
856	establish_connection ();
857	}	1008	}
858	}	1009	}
859		1010
		1011	void
860	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
861	{	1013	{
862	if (ictx && octx)	1014	if (ictx && octx)
863	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
864	else	1016	else
865	{	1017	{
866	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
867		1019	post_inject_queue ();
868	establish_connection ();
869	}	1020	}
870	}	1021	}
871		1022
872	void	1023	void
873	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
874	{	1025	{
875	last_activity = NOW;	1026	last_activity = ev_now ();
876		1027
877	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
878	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
879		1033
880	switch (pkt->typ ())	1034	switch (pkt->typ ())
881	{	1035	{
882	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
883	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
884	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
885	// when we receive a ping.	1041	// when we receive a ping.
886	if (!ictx)	1042	if (!ictx)
887	{	1043	{
888	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
889	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
890	}	1046	}
891	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
892	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
893		1051
894	break;	1052	break;
895		1053
896	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
897	break;	1060	break;
898		1061
899	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
900	{	1063	{
901	reset_connection ();	1064	reset_connection ();
902		1065
903	config_packet *p = (config_packet *) pkt;	1066	config_packet *p = (config_packet *) pkt;
904		1067
905	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
906	{
907	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
908	conf->nodename, (const char *)rsi);
909	connectmode = conf_node::C_DISABLED;
910	}
911	else if (connectmode == conf_node::C_ALWAYS)
912	establish_connection ();	1069	establish_connection ();
913	}	1070	}
914	break;	1071	break;
915		1072
916	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
917	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
918	{	1075	{
919	auth_req_packet *p = (auth_req_packet *) pkt;	1076	auth_req_packet *p = (auth_req_packet *)pkt;
920		1077
921	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
922		1081
923	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
924	{	1088	{
925	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
926	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
927	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
928	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
929		1093
930	if (p->initiate)	1094	if (p->initiate)
931	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
932		1096
933	rsachallenge k;	1097	auth_data auth;
934		1098
935	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
936	{	1100	{
937	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
938	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
939	break;
940	}	1103	}
941	else	1104	else
942	{	1105	{
943	delete octx;	1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
944		1107
945	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
946	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
947		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
948	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
949	features = p->features & config_packet::get_features ();	1116	features = p->features & config_packet::get_features ();
950		1117
951	send_auth_response (rsi, p->id, k);
952
953	connection_established ();	1118	connection_established (rsi);
954
955	break;	1119	}
956	}	1120	}
		1121
		1122	break;
957	}	1123	}
958	else
959	slog (L_WARN, _("%s(%s): protocol mismatch"),
960	conf->nodename, (const char *)rsi);
961		1124
962	send_reset (rsi);	1125	send_reset (rsi);
963	}	1126	}
964		1127
965	break;	1128	break;
966		1129
967	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
968	{	1131	{
969	auth_res_packet *p = (auth_res_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
970		1133
971	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
972		1135
973	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
974	{	1140	{
975	if (p->prot_minor != PROTOCOL_MINOR)
976	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
977	conf->nodename, (const char *)rsi,
978	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
979
980	rsachallenge chg;
981
982	if (!rsa_cache.find (p->id, chg))
983	{
984	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
985	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
986	break;
987	}	1143	}
988	else	1144	else if (!have_snd_auth)
989	{	1145	{
990	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
991		1147
992	if (!p->hmac_chk (cctx))	1148	have_snd_auth = true;
993	{
994	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
995	"could be an attack, or just corruption or a synchronization error"),
996	conf->nodename, (const char *)rsi);
997	break;
998	}
999	else
1000	{
1001	rsaresponse h;
1002
1003	rsa_hash (p->id, chg, h);
1004
1005	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1006	{
1007	prot_minor = p->prot_minor;
1008
1009	delete ictx; ictx = cctx;
1010
1011	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1012
1013	si = rsi;
1014	protocol = rsi.prot;
1015
1016	connection_established ();	1149	connection_established (rsi);
1017
1018	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1019	conf->nodename, (const char *)rsi,
1020	p->prot_major, p->prot_minor);
1021
1022	if (::conf.script_node_up)
1023	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1024	slog (L_WARN, _("node-up command execution failed, continuing."));
1025
1026	break;
1027	}
1028	else
1029	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1030	conf->nodename, (const char *)rsi);
1031	}
1032
1033	delete cctx;
1034	}
1035	}	1150	}
1036	}	1151	}
1037
1038	send_reset (rsi);
1039	break;	1152	break;
1040		1153
1041	case vpn_packet::PT_DATA_COMPRESSED:	1154	case vpn_packet::PT_DATA_COMPRESSED:
1042	#if !ENABLE_COMPRESSION	1155	#if !ENABLE_COMPRESSION
1043	send_reset (rsi);	1156	send_reset (rsi);
…		…
1050	{	1163	{
1051	vpndata_packet *p = (vpndata_packet *)pkt;	1164	vpndata_packet *p = (vpndata_packet *)pkt;
1052		1165
1053	if (!p->hmac_chk (ictx))	1166	if (!p->hmac_chk (ictx))
1054	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1167	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1055	"could be an attack, or just corruption or a synchronization error"),	1168	"could be an attack, or just corruption or a synchronization error."),
1056	conf->nodename, (const char *)rsi);	1169	conf->nodename, (const char *)rsi);
1057	else	1170	else
1058	{	1171	{
1059	u32 seqno;	1172	u32 seqno;
1060	tap_packet *d = p->unpack (this, seqno);	1173	tap_packet *d = p->unpack (this, seqno);
		1174	int seqclass = iseqno.seqno_classify (seqno);
1061		1175
1062	if (iseqno.recv_ok (seqno))	1176	if (seqclass == 0) // ok
1063	{	1177	{
1064	vpn->tap->send (d);	1178	vpn->tap->send (d);
1065		1179
1066	if (si != rsi)	1180	if (si != rsi)
1067	{	1181	{
1068	// fast re-sync on source address changes, useful especially for tcp/ip	1182	// fast re-sync on source address changes, useful especially for tcp/ip
		1183	//if (last_si_change < ev_now () + 5.)
1069	si = rsi;	1184	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1185	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	conf->nodename, (const char *)si, (const char *)rsi);	1186	conf->nodename, (const char *)si, (const char *)rsi);
		1187
		1188	si = rsi;
		1189
		1190	if (::conf.script_node_change)
		1191	{
		1192	run_script_cb *cb = new run_script_cb;
		1193	cb->set<connection, &connection::script_node_change> (this);
		1194	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1195	}
		1196
		1197	// }
		1198	//else
		1199	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1200	// conf->nodename, (const char *)si, (const char *)rsi);
1073	}	1201	}
		1202	}
		1203	else if (seqclass == 1) // far history
		1204	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1205	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1206	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1207	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1208	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1209	else if (seqclass == 3) // reset
		1210	{
		1211	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1212	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1213	send_reset (rsi);
1074	}	1214	}
1075		1215
1076	delete d;	1216	delete d;
1077	break;	1217	break;
1078	}	1218	}
…		…
1082	break;	1222	break;
1083		1223
1084	case vpn_packet::PT_CONNECT_REQ:	1224	case vpn_packet::PT_CONNECT_REQ:
1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1225	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1086	{	1226	{
1087	connect_req_packet *p = (connect_req_packet *) pkt;	1227	connect_req_packet *p = (connect_req_packet *)pkt;
1088		1228
1089	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1229	if (p->id > 0 && p->id <= vpn->conns.size ())
1090	connection *c = vpn->conns[p->id - 1];
1091	conf->protocols = p->protocols;
1092
1093	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1094	conf->id, p->id, c->ictx && c->octx);
1095
1096	if (c->ictx && c->octx)
1097	{	1230	{
		1231	connection *c = vpn->conns[p->id - 1];
		1232	conf->protocols = p->protocols;
		1233
		1234	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1235	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1236	p->protocols,
		1237	c->ictx && c->octx);
		1238
		1239	if (c->ictx && c->octx)
		1240	{
1098	// send connect_info packets to both sides, in case one is	1241	// send connect_info packets to both sides, in case one is
1099	// behind a nat firewall (or both ;)	1242	// behind a nat firewall (or both ;)
1100	c->send_connect_info (conf->id, si, conf->protocols);	1243	c->send_connect_info (conf->id, si, conf->protocols);
1101	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1244	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1245	}
		1246	else
		1247	c->establish_connection ();
1102	}	1248	}
1103	else	1249	else
1104	c->establish_connection ();	1250	slog (L_WARN,
		1251	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1252	p->id);
1105	}	1253	}
1106		1254
1107	break;	1255	break;
1108		1256
1109	case vpn_packet::PT_CONNECT_INFO:	1257	case vpn_packet::PT_CONNECT_INFO:
1110	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1111	{	1259	{
1112	connect_info_packet *p = (connect_info_packet *)pkt;	1260	connect_info_packet *p = (connect_info_packet *)pkt;
1113		1261
1114	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1115	{	1263	{
1116	connection *c = vpn->conns[p->id - 1];	1264	connection *c = vpn->conns[p->id - 1];
1117		1265
1118	c->conf->protocols = p->protocols;	1266	c->conf->protocols = p->protocols;
1119	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1267	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1120	p->si.upgrade_protocol (protocol, c->conf);	1268	p->si.upgrade_protocol (protocol, c->conf);
1121		1269
1122	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1270	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1123	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1271	conf->nodename,
		1272	vpn->conns[p->id - 1]->conf->nodename,
		1273	(const char *)p->si,
		1274	p->protocols,
		1275	protocol,
		1276	p->si.supported_protocols (c->conf),
		1277	!c->ictx && !c->octx);
1124		1278
1125	const sockinfo &dsi = forward_si (p->si);	1279	const sockinfo &dsi = forward_si (p->si);
1126		1280
1127	if (dsi.valid ())	1281	if (dsi.valid ())
1128	c->send_auth_request (dsi, true);	1282	c->send_auth_request (dsi, true);
		1283	else
		1284	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1285	vpn->conns[p->id - 1]->conf->nodename,
		1286	(const char *)p->si);
1129	}	1287	}
		1288	else
		1289	slog (L_WARN,
		1290	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1291	p->id);
1130	}	1292	}
1131		1293
1132	break;	1294	break;
1133		1295
1134	default:	1296	default:
1135	send_reset (rsi);	1297	send_reset (rsi);
1136	break;	1298	break;
1137	}	1299	}
1138	}	1300	}
1139		1301
1140	void connection::keepalive_cb (time_watcher &w)	1302	inline void
		1303	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1304	{
1142	if (NOW >= last_activity + ::conf.keepalive + 30)	1305	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1306
		1307	if (when >= 0)
		1308	w.start (when);
		1309	else if (when < -15)
1143	{	1310	{
1144	reset_connection ();	1311	reset_connection ();
1145	establish_connection ();	1312	establish_connection ();
1146	}	1313	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.start (last_activity + ::conf.keepalive);
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1314	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1315	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1316	{
		1317	w.start (3);
1152	send_ping (si);	1318	send_ping (si);
1153	w.start (NOW + 5);
1154	}	1319	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1320	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1321	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1322	// should delete octx, though, or something like that ;)
1158	w.start (last_activity + ::conf.keepalive + 10);	1323	w.start (when + 10);
1159	else	1324	else
1160	reset_connection ();	1325	reset_connection ();
1161	}	1326	}
1162		1327
		1328	void
1163	void connection::send_connect_request (int id)	1329	connection::send_connect_request (int id)
1164	{	1330	{
1165	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1331	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1166		1332
1167	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1333	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1334	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1335	THISNODE->protocols);
1168	p->hmac_set (octx);	1336	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1337	send_vpn_packet (p, si);
1170		1338
1171	delete p;	1339	delete p;
1172	}	1340	}
1173		1341
		1342	void
1174	void connection::script_init_env (const char *ext)	1343	connection::script_init_env (const char *ext)
1175	{	1344	{
1176	char *env;	1345	char *env;
1177	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1346	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1178	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1347	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1179	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1348	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1180	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1349	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1181	conf->id & 0xff); putenv (env);	1350	conf->id & 0xff); putenv (env);
1182	}	1351	}
1183		1352
		1353	void
1184	void connection::script_init_connect_env ()	1354	connection::script_init_connect_env ()
1185	{	1355	{
1186	vpn->script_init_env ();	1356	vpn->script_init_env ();
1187		1357
1188	char *env;	1358	char *env;
1189	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1359	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1360	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1190	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1191	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1192	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1193	}	1364	}
1194		1365
		1366	inline const char *
1195	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1196	{	1368	{
1197	script_init_connect_env ();	1369	script_init_connect_env ();
1198		1370
1199	putenv ("STATE=up");	1371	putenv ((char *)"STATE=up");
1200		1372
1201	char *filename;	1373	char *filename;
1202	asprintf (&filename,	1374	asprintf (&filename,
1203	"%s/%s",	1375	"%s/%s",
1204	confbase,	1376	confbase,
1205	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1206		1378
1207	return filename;	1379	return filename;
1208	}	1380	}
1209		1381
1210	const char *connection::script_node_down ()	1382	inline const char *
		1383	connection::script_node_change ()
1211	{	1384	{
1212	script_init_connect_env ();	1385	script_init_connect_env ();
1213		1386
		1387	putenv ((char *)"STATE=change");
		1388
		1389	char *filename;
		1390	asprintf (&filename,
		1391	"%s/%s",
		1392	confbase,
		1393	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1394
		1395	return filename;
		1396	}
		1397
		1398	inline const char *
		1399	connection::script_node_down ()
		1400	{
		1401	script_init_connect_env ();
		1402
1214	putenv ("STATE=down");	1403	putenv ((char *)"STATE=down");
1215		1404
1216	char *filename;	1405	char *filename;
1217	asprintf (&filename,	1406	asprintf (&filename,
1218	"%s/%s",	1407	"%s/%s",
1219	confbase,	1408	confbase,
…		…
1221		1410
1222	return filename;	1411	return filename;
1223	}	1412	}
1224		1413
1225	connection::connection (struct vpn *vpn, conf_node *conf)	1414	connection::connection (struct vpn *vpn, conf_node *conf)
1226	: vpn(vpn), conf(conf)	1415	: vpn(vpn), conf(conf),
1227	, rekey (this, &connection::rekey_cb)
1228	, keepalive (this, &connection::keepalive_cb)
1229	, establish_connection (this, &connection::establish_connection_cb)
1230	#if ENABLE_DNS	1416	#if ENABLE_DNS
1231	, dns (0)	1417	dns (0),
1232	#endif	1418	#endif
		1419	data_queue(conf->max_ttl, conf->max_queue + 1),
		1420	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1233	{	1421	{
		1422	rekey .set<connection, &connection::rekey_cb > (this);
		1423	keepalive .set<connection, &connection::keepalive_cb > (this);
		1424	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1425
		1426	last_establish_attempt = 0.;
1234	octx = ictx = 0;	1427	octx = ictx = 0;
1235	retry_cnt = 0;
1236		1428
1237	if (!conf->protocols) // make sure some protocol is enabled	1429	connectmode = conf->connectmode;
1238	conf->protocols = PROT_UDPv4;
1239		1430
1240	connectmode = conf_node::C_ALWAYS; // initial setting	1431	// queue a dummy packet to force an initial connection attempt
		1432	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1433	vpn_queue.put (new net_packet);
		1434
1241	reset_connection ();	1435	reset_connection ();
1242	}	1436	}
1243		1437
1244	connection::~connection ()	1438	connection::~connection ()
1245	{	1439	{
1246	shutdown ();	1440	shutdown ();
1247	}	1441	}
1248		1442
		1443	void
1249	void connection_init ()	1444	connection_init ()
1250	{	1445	{
1251	auth_rate_limiter.clear ();	1446	auth_rate_limiter.clear ();
1252	reset_rate_limiter.clear ();	1447	reset_rate_limiter.clear ();
1253	}	1448	}
1254		1449

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