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Comparing gvpe/src/connection.C (file contents):
Revision 1.24 by pcg, Wed Oct 22 01:05:23 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	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
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	extern "C" {
23	# include "lzf/lzf.h"
24	}
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>
32
33	#include "gettext.h"
34		42
35	#include "conf.h"	43	#include "conf.h"
36	#include "slog.h"	44	#include "slog.h"
37	#include "device.h"	45	#include "device.h"
38	#include "vpn.h"	46	#include "vpn.h"
39	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
40		49
41	#include "netcompat.h"	50	#include "netcompat.h"
42		51
43	#if !HAVE_RAND_PSEUDO_BYTES
44	# define RAND_pseudo_bytes RAND_bytes
45	#endif
46
47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb *cb, const char *warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
48		104
49	struct crypto_ctx	105	struct crypto_ctx
50	{	106	{
51	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
52	HMAC_CTX hctx;	108	HMAC_CTX hctx;
53		109
54	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);
55	~crypto_ctx ();	111	~crypto_ctx ();
56	};	112	};
57		113
58	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)
59	{	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
60	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
61	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
62	HMAC_CTX_init (&hctx);	146	}
63	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
64	}	147	}
65		148
66	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
67	{	150	{
68	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
69	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
70	}	153	}
71		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
72	static void	182	static void
73	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, auth_mac &mac)
74	{	184	{
75	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
76		186
77	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
78	EVP_DigestInit (&ctx, RSA_HASH);	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
79	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
80	EVP_DigestUpdate(&ctx, &id, sizeof id);	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
81	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
82	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
83	}	192	}
84		193
85	struct rsa_entry {	194	void
86	tstamp expire;	195	connection::generate_auth_data ()
87	rsaid id;
88	rsachallenge chg;
89	};
90
91	struct rsa_cache : list<rsa_entry>
92	{	196	{
93	void cleaner_cb (time_watcher &w); time_watcher cleaner;	197	if (auth_expire < ev_now ())
94
95	bool find (const rsaid &id, rsachallenge &chg)
96	{
97	for (iterator i = begin (); i != end (); ++i)
98	{
99	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
100	{
101	memcpy (&chg, &i->chg, sizeof chg);
102
103	erase (i);
104	return true;
105	}
106	}
107
108	if (cleaner.at < NOW)
109	cleaner.start (NOW + RSA_TTL);
110
111	return false;
112	}
113
114	void gen (rsaid &id, rsachallenge &chg)
115	{
116	rsa_entry e;
117
118	RAND_bytes ((unsigned char *)&id, sizeof id);
119	RAND_bytes ((unsigned char *)&chg, sizeof chg);
120
121	e.expire = NOW + RSA_TTL;
122	e.id = id;
123	memcpy (&e.chg, &chg, sizeof chg);
124
125	push_back (e);
126
127	if (cleaner.at < NOW)
128	cleaner.start (NOW + RSA_TTL);
129	}
130
131	rsa_cache ()
132	: cleaner (this, &rsa_cache::cleaner_cb)
133	{ }	198	{
		199	// request data
		200	rand_fill (snd_auth.rsa);
		201	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		202	auth_hash (snd_auth, snd_auth_mac);
134		203
135	} rsa_cache;	204	// eventual response data
136		205	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
137	void rsa_cache::cleaner_cb (time_watcher &w)
138	{
139	if (empty ())
140	w.at = TSTAMP_CANCEL;
141	else
142	{	206	}
143	w.at = NOW + RSA_TTL;
144		207
145	for (iterator i = begin (); i != end (); )	208	// every use prolongs the expiry
146	if (i->expire <= NOW)	209	auth_expire = ev_now () + AUTH_TTL;
147	i = erase (i);
148	else
149	++i;
150	}
151	}	210	}
152		211
153	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
154		213
155	void pkt_queue::put (net_packet *p)	214	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		215	: max_ttl (max_ttl), max_queue (max_queue)
156	{	216	{
157	if (queue[i])	217	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		218
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	219	i = 0;
185	j = 0;	220	j = 0;
		221
		222	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	223	}
187		224
188	pkt_queue::~pkt_queue ()	225	pkt_queue::~pkt_queue ()
189	{	226	{
190	for (i = QUEUEDEPTH; --i > 0; )	227	while (net_packet *p = get ())
		228	delete p;
		229
191	delete queue[i];	230	delete [] queue;
192	}	231	}
193		232
		233	void
		234	pkt_queue::expire_cb (ev::timer &w, int revents)
		235	{
		236	ev_tstamp expire = ev_now () - max_ttl;
		237
		238	for (;;)
		239	{
		240	if (empty ())
		241	break;
		242
		243	double diff = queue[j].tstamp - expire;
		244
		245	if (diff >= 0.)
		246	{
		247	w.start (diff > 0.5 ? diff : 0.5);
		248	break;
		249	}
		250
		251	delete get ();
		252	}
		253	}
		254
		255	void
		256	pkt_queue::put (net_packet *p)
		257	{
		258	ev_tstamp now = ev_now ();
		259
		260	// start expiry timer
		261	if (empty ())
		262	expire.start (max_ttl);
		263
		264	int ni = i + 1 == max_queue ? 0 : i + 1;
		265
		266	if (ni == j)
		267	delete get ();
		268
		269	queue[i].pkt = p;
		270	queue[i].tstamp = now;
		271
		272	i = ni;
		273	}
		274
		275	net_packet *
		276	pkt_queue::get ()
		277	{
		278	if (empty ())
		279	return 0;
		280
		281	net_packet *p = queue[j].pkt;
		282	queue[j].pkt = 0;
		283
		284	j = j + 1 == max_queue ? 0 : j + 1;
		285
		286	return p;
		287	}
		288
194	struct net_rateinfo {	289	struct net_rateinfo
		290	{
195	u32 host;	291	u32 host;
196	double pcnt, diff;	292	double pcnt, diff;
197	tstamp last;	293	tstamp last;
198	};	294	};
199		295
200	// only do action once every x seconds per host whole allowing bursts.	296	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	297	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	298	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	299	struct net_rate_limiter : list<net_rateinfo>
204	{	300	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	301	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	302	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	303	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	304	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		305
210	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	307	bool can (u32 host);
212	};	308	};
213		309
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		311
		312	bool
216	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
217	{	314	{
218	iterator i;	315	iterator i;
219		316
220	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
221	if (i->host == host)	318	if (i->host == host)
222	break;	319	break;
223	else if (i->last < NOW - EXPIRE)	320	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	321	i = erase (i);
225	else	322	else
226	i++;	323	i++;
227		324
228	if (i == end ())	325	if (i == end ())
229	{	326	{
230	net_rateinfo ri;	327	net_rateinfo ri;
231		328
232	ri.host = host;	329	ri.host = host;
233	ri.pcnt = 1.;	330	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	331	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	332	ri.last = ev_now ();
236		333
237	push_front (ri);	334	push_front (ri);
238		335
239	return true;	336	return true;
240	}	337	}
241	else	338	else
242	{	339	{
243	net_rateinfo ri (*i);	340	net_rateinfo ri (*i);
244	erase (i);	341	erase (i);
245		342
246	ri.pcnt = ri.pcnt * ALPHA;	343	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	344	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		345
249	ri.last = NOW;	346	ri.last = ev_now ();
250		347
251	double dif = ri.diff / ri.pcnt;	348	double dif = ri.diff / ri.pcnt;
252		349
253	bool send = dif > CUTOFF;	350	bool send = dif > NRL_CUTOFF;
254		351
255	if (dif > MAXDIF)	352	if (dif > NRL_MAXDIF)
256	{	353	{
257	ri.pcnt = 1.;	354	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	355	ri.diff = NRL_MAXDIF;
259	}	356	}
260	else if (send)	357	else if (send)
261	ri.pcnt++;	358	ri.pcnt++;
262		359
263	push_front (ri);	360	push_front (ri);
…		…
268		365
269	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
270		367
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
272		369
		370	void
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
274	{	372	{
275	unsigned int xlen;	373	unsigned int xlen;
276		374
277	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
278		376
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
281	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
283	}	381	}
284		382
285	void	383	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	385	{
…		…
296	hmac_gen (ctx);	394	hmac_gen (ctx);
297		395
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
299	}	397	}
300		398
		399	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	401	{
303	type = type_;	402	type = type_;
304		403
305	int src = THISNODE->id;	404	int src = THISNODE->id;
306		405
…		…
310	}	409	}
311		410
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		413
315	struct vpndata_packet:vpn_packet	414	struct vpndata_packet : vpn_packet
		415	{
		416	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		417
		418	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		419	tap_packet *unpack (connection *conn, u32 &seqno);
		420
		421	private:
		422	const u32 data_hdr_size () const
316	{	423	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	425	}
		426	};
328		427
329	void	428	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	429	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	430	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
333	int outl = 0, outl2;	432	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
335		434
336	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
338	u32 cl;
339		437
		438	if (conn->features & FEATURE_COMPRESSION)
		439	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		441
341	if (cl)	442	if (cl)
342	{	443	{
343	type = PT_DATA_COMPRESSED;	444	type = PT_DATA_COMPRESSED;
344	d = cdata;	445	d = cdata;
345	l = cl + 2;	446	l = cl + 2;
346		447
347	d[0] = cl >> 8;	448	d[0] = cl >> 8;
348	d[1] = cl;	449	d[1] = cl;
		450	}
349	}	451	}
350	#endif	452	#endif
351		453
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
353		455
354	struct {	456	struct {
355	#if RAND_SIZE	457	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
357	#endif	459	#endif
358	u32 seqno;	460	u32 seqno;
359	} datahdr;	461	} datahdr;
360		462
361	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	464	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	465	// NB: a constant (per session) random prefix
		466	// is likely enough, but we don't take any chances.
		467	conn->oiv.get (datahdr.rnd, RAND_SIZE);
364	#endif	468	#endif
365		469
366	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	473	outl += outl2;
370		474
371	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	477	(unsigned char *) d, l));
374	outl += outl2;	478	outl += outl2;
375		479
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	481	outl += outl2;
378		482
379	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
380		484
381	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	494	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
392	u8 *d;	496	u8 *d;
393	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
394		498
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
396		500
397	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
399		503
400	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
401	d = cdata;	505	d = cdata;
402	else	506	else
403	#endif	507	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
405		509
406	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
407	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	518	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	520	outl += outl2;
411		521
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	523	outl += outl2;
414		524
415	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	525	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
416		526
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
442	}	552	}
443	};	553	};
444		554
445	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
446	{	556	{
447	// actually, hmaclen cannot be checked because the hmac	557	u8 serial[SERIAL_SIZE];
448	// field comes before this data, so peers with other
449	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	558	u8 prot_major, prot_minor, randsize;
451	u8 flags, challengelen, pad2, pad3;	559	u8 flags, features, pad6, pad7, pad8;
452	u32 cipher_nid, digest_nid, hmac_nid;	560	u32 cipher_nid, mac_nid, auth_nid;
453		561
454	const u8 curflags () const	562	void setup (ptype type, int dst);
		563	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		564
		565	static u8 get_features ()
455	{	566	{
		567	u8 f = 0;
		568	#if ENABLE_COMPRESSION
		569	f |= FEATURE_COMPRESSION;
		570	#endif
		571	#if ENABLE_ROHC
		572	f |= FEATURE_ROHC;
		573	#endif
		574	#if ENABLE_BRIDGING
		575	f |= FEATURE_BRIDGING;
		576	#endif
456	return 0x80	577	return f;
457	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}	578	}
459
460	void setup (ptype type, int dst);
461	bool chk_config () const;
462	};	579	};
463		580
		581	void
464	void config_packet::setup (ptype type, int dst)	582	config_packet::setup (ptype type, int dst)
465	{	583	{
466	prot_major = PROTOCOL_MAJOR;	584	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	585	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	586	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	587	flags = 0;
470	flags = curflags ();	588	features = get_features ();
471	challengelen = sizeof (rsachallenge);
472		589
		590	strncpy ((char *)serial, conf.serial, sizeof (serial));
		591
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	592	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	593	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		594	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
476		595
477	len = sizeof (*this) - sizeof (net_packet);	596	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	597	set_hdr (type, dst);
479	}	598	}
480		599
481	bool config_packet::chk_config () const	600	bool
		601	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
482	{	602	{
483	if (prot_major != PROTOCOL_MAJOR)	603	if (prot_major != PROTOCOL_MAJOR)
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	604	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		605	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	606	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	607	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
487	else if (hmaclen != HMACLENGTH)	608	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	609	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	610	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	611	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	612	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
498	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	613	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		614	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		615	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		616	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		617	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
499	else	618	else
		619	{
		620	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		621
		622	if (cmp > 0)
		623	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		624	conf->nodename, (const char *)rsi);
		625	else if (cmp == 0)
500	return true;	626	return true;
		627	}
501		628
502	return false;	629	return false;
503	}	630	}
504		631
505	struct auth_req_packet : config_packet	632	struct auth_req_packet : config_packet // UNPROTECTED
506	{	633	{
507	char magic[8];	634	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	635	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	636	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	637	u8 pad2, pad3;
511	rsaid id;	638	auth_encr encr;
512	rsaencrdata encr;
513		639
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	640	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	641	{
516	config_packet::setup (PT_AUTH_REQ, dst);	642	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	643	memcpy (magic, MAGIC, 8);
518	initiate = !!initiate_;	644	initiate = !!initiate_;
519	protocols = protocols_;	645	protocols = protocols_;
520		646
521	len = sizeof (*this) - sizeof (net_packet);	647	len = sizeof (*this) - sizeof (net_packet);
522	}	648	}
523	};	649	};
524		650
525	struct auth_res_packet : config_packet	651	struct auth_res_packet : vpn_packet // UNPROTECTED
526	{	652	{
527	rsaid id;
528	u8 pad1, pad2, pad3;
529	u8 response_len; // encrypted length
530	rsaresponse response;	653	auth_response response;
531		654
532	auth_res_packet (int dst)	655	auth_res_packet (int dst)
533	{	656	{
534	config_packet::setup (PT_AUTH_RES, dst);	657	set_hdr (PT_AUTH_RES, dst);
535		658
536	len = sizeof (*this) - sizeof (net_packet);	659	len = sizeof (*this) - sizeof (net_packet);
537	}	660	}
538	};	661	};
539		662
…		…
569	};	692	};
570		693
571	/////////////////////////////////////////////////////////////////////////////	694	/////////////////////////////////////////////////////////////////////////////
572		695
573	void	696	void
574	connection::connection_established ()	697	connection::connection_established (const sockinfo &rsi)
575	{	698	{
		699	if (!have_snd_auth || !have_rcv_auth)
		700	return;
		701
		702	si = rsi;
		703	protocol = rsi.prot;
		704
		705	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		706	conf->nodename, (const char *)rsi,
		707	is_direct ? "direct" : "forwarded",
		708	PROTOCOL_MAJOR, prot_minor);
		709
		710	if (::conf.script_node_up)
		711	{
		712	run_script_cb *cb = new run_script_cb;
		713	cb->set<connection, &connection::script_node_up> (this);
		714	run_script_queued (cb, _("node-up command execution failed, continuing."));
		715	}
		716
		717	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		718	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		719
		720	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		721	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		722
		723	oiv.reset ();
		724
		725	// make sure rekeying timeouts are slightly asymmetric
		726	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		727	rekey.start (rekey_interval, rekey_interval);
		728
		729	keepalive.start (::conf.keepalive);
		730
		731	// send queued packets
576	if (ictx && octx)	732	if (ictx && octx)
577	{	733	{
578	connectmode = conf->connectmode;	734	while (tap_packet *p = (tap_packet *)data_queue.get ())
579
580	rekey.start (NOW + ::conf.rekey);
581	keepalive.start (NOW + ::conf.keepalive);
582
583	// send queued packets
584	if (ictx && octx)
585	{	735	{
586	while (tap_packet *p = (tap_packet *)data_queue.get ())
587	{
588	send_data_packet (p);	736	if (p->len) send_data_packet (p);
589	delete p;	737	delete p;
590	}
591
592	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;
596	}
597	}	738	}
		739
		740	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		741	{
		742	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		743	delete p;
		744	}
598	}	745	}
		746
		747	vpn->connection_established (this);
		748	}
		749
		750	void
		751	connection::reset_si ()
		752	{
		753	if (vpn->can_direct (THISNODE, conf))
		754	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
599	else	755	else
600	{	756	{
601	retry_cnt = 0;	757	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
602	establish_connection.start (NOW + 5);	758	protocol = 0;
603	keepalive.reset ();
604	rekey.reset ();
605	}	759	}
606	}
607
608	void
609	connection::reset_si ()
610	{
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);
612
613	// mask out protocols we cannot establish
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
616		760
617	si.set (conf, protocol);	761	si.set (conf, protocol);
		762
		763	is_direct = si.valid ();
618	}	764	}
619		765
620	// ensure sockinfo is valid, forward if necessary	766	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	767	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	768	connection::forward_si (const sockinfo &si) const
623	{	769	{
624	if (!si.valid ())	770	if (!si.valid ())
625	{	771	{
626	connection *r = vpn->find_router ();	772	connection *r = vpn->find_router_for (this);
627		773
628	if (r)	774	if (r)
629	{	775	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	776	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	777	conf->nodename, r->conf->nodename);
632	return r->si;	778	return r->si;
633	}	779	}
634	else	780	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	781	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	782	conf->nodename);
637	}	783	}
638		784
639	return si;	785	return si;
640	}	786	}
…		…
650	connection::send_ping (const sockinfo &si, u8 pong)	796	connection::send_ping (const sockinfo &si, u8 pong)
651	{	797	{
652	ping_packet *pkt = new ping_packet;	798	ping_packet *pkt = new ping_packet;
653		799
654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	800	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		801
		802	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	803	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		804
657	delete pkt;	805	delete pkt;
658	}	806	}
659		807
…		…
674	void	822	void
675	connection::send_auth_request (const sockinfo &si, bool initiate)	823	connection::send_auth_request (const sockinfo &si, bool initiate)
676	{	824	{
677	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	825	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
678		826
679	rsachallenge chg;	827	generate_auth_data ();
680	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	828	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
682		829
683	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	830	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
684
685	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	831	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
686		832
687	delete pkt;	833	delete pkt;
688	}	834	}
689		835
690	void	836	void
691	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	837	connection::send_auth_response (const sockinfo &si)
692	{	838	{
693	auth_res_packet *pkt = new auth_res_packet (conf->id);	839	auth_res_packet *pkt = new auth_res_packet (conf->id);
694		840
695	pkt->id = id;	841	auth_hash (rcv_auth, pkt->response.mac);
		842	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
696		843
697	rsa_hash (id, chg, pkt->response);
698
699	pkt->hmac_set (octx);
700
701	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	844	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702
703	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	845	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		846
705	delete pkt;	847	delete pkt;
706	}	848	}
707		849
708	void	850	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	851	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	852	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	853	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	854	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		855	conf->protocols);
713		856
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	857	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		858
716	r->hmac_set (octx);	859	r->hmac_set (octx);
717	send_vpn_packet (r, si);	860	send_vpn_packet (r, si);
718		861
719	delete r;	862	delete r;
720	}	863	}
721		864
722	void	865	inline void
723	connection::establish_connection_cb (time_watcher &w)	866	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	867	{
725	if (ictx || conf == THISNODE	868	if (!(ictx && octx)
		869	&& conf != THISNODE
726	|| connectmode == conf_node::C_NEVER	870	&& connectmode != conf_node::C_NEVER
727	|| connectmode == conf_node::C_DISABLED)	871	&& connectmode != conf_node::C_DISABLED
728	w.at = TSTAMP_CANCEL;	872	&& !w.is_active ())
729	else if (w.at <= NOW)
730	{	873	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	874	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		875	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	876	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		877	{
		878	reset_connection ();
734	retry_cnt++;	879	return;
		880	}
735		881
736	w.at = NOW + retry_int;	882	last_establish_attempt = ev_now ();
		883
		884	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		885	? (retry_cnt & 3) + 1
		886	: 1 << (retry_cnt >> 2));
737		887
738	reset_si ();	888	reset_si ();
739		889
740	if (si.prot && !si.host)	890	bool slow = si.prot & PROT_SLOW;
		891
		892	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		893	{
		894	/*TODO*/ /* start the timer so we don't recurse endlessly */
		895	w.start (1);
741	vpn->send_connect_request (conf->id);	896	vpn->send_connect_request (this);
		897	}
742	else	898	else
743	{	899	{
		900	if (si.valid ())
		901	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		902	conf->nodename, (const char *)si);
		903
744	const sockinfo &dsi = forward_si (si);	904	const sockinfo &dsi = forward_si (si);
		905
		906	slow = slow || (dsi.prot & PROT_SLOW);
745		907
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	908	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	909	{
748	if (retry_cnt < 4)	910	if (retry_cnt < 4)
749	send_auth_request (dsi, true);	911	send_auth_request (dsi, true);
750	else	912	else
751	send_ping (dsi, 0);	913	send_ping (dsi, 0);
752	}	914	}
753	}	915	}
		916
		917	retry_int *= slow ? 8. : 0.9;
		918
		919	if (retry_int < conf->max_retry)
		920	retry_cnt++;
		921	else
		922	retry_int = conf->max_retry;
		923
		924	w.start (retry_int);
754	}	925	}
755	}	926	}
756		927
757	void	928	void
758	connection::reset_connection ()	929	connection::reset_connection ()
…		…
761	{	932	{
762	slog (L_INFO, _("%s(%s): connection lost"),	933	slog (L_INFO, _("%s(%s): connection lost"),
763	conf->nodename, (const char *)si);	934	conf->nodename, (const char *)si);
764		935
765	if (::conf.script_node_down)	936	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	937	{
		938	run_script_cb *cb = new run_script_cb;
		939	cb->set<connection, &connection::script_node_down> (this);
		940	run_script_queued (cb, _("node-down command execution failed, continuing."));
		941	}
767	}	942	}
768		943
769	delete ictx; ictx = 0;	944	delete ictx; ictx = 0;
770	delete octx; octx = 0;	945	delete octx; octx = 0;
771		946
772	si.host= 0;	947	si.host = 0;
773		948
		949	have_snd_auth = false;
		950	have_rcv_auth = false;
		951	auth_expire = 0.;
		952
774	last_activity = 0;	953	last_activity = 0.;
		954	//last_si_change = 0.;
775	retry_cnt = 0;	955	retry_cnt = 0;
776		956
777	rekey.reset ();	957	rekey.stop ();
778	keepalive.reset ();	958	keepalive.stop ();
779	establish_connection.reset ();	959	establish_connection.stop ();
780	}	960	}
781		961
782	void	962	void
783	connection::shutdown ()	963	connection::shutdown ()
784	{	964	{
…		…
786	send_reset (si);	966	send_reset (si);
787		967
788	reset_connection ();	968	reset_connection ();
789	}	969	}
790		970
791	void	971	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	972	inline void
		973	connection::rekey_cb (ev::timer &w, int revents)
793	{	974	{
794	w.at = TSTAMP_CANCEL;
795
796	reset_connection ();	975	reset_connection ();
797	establish_connection ();	976	establish_connection ();
798	}	977	}
799		978
800	void	979	void
…		…
815	if (oseqno > MAX_SEQNO)	994	if (oseqno > MAX_SEQNO)
816	rekey ();	995	rekey ();
817	}	996	}
818		997
819	void	998	void
		999	connection::post_inject_queue ()
		1000	{
		1001	// force a connection every now and when when packets are sent (max 1/s)
		1002	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		1003	establish_connection.stop ();
		1004
		1005	establish_connection ();
		1006	}
		1007
		1008	void
820	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1009	connection::inject_data_packet (tap_packet *pkt)
821	{	1010	{
822	if (ictx && octx)	1011	if (ictx && octx)
823	send_data_packet (pkt);	1012	send_data_packet (pkt);
824	else	1013	else
825	{	1014	{
826	if (!broadcast)//DDDD
827	data_queue.put (new tap_packet (*pkt));	1015	data_queue.put (new tap_packet (*pkt));
828		1016	post_inject_queue ();
829	establish_connection ();
830	}	1017	}
831	}	1018	}
832		1019
		1020	void
833	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1021	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
834	{	1022	{
835	if (ictx && octx)	1023	if (ictx && octx)
836	send_vpn_packet (pkt, si, tos);	1024	send_vpn_packet (pkt, si, tos);
837	else	1025	else
838	{	1026	{
839	vpn_queue.put (new vpn_packet (*pkt));	1027	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
840		1028	post_inject_queue ();
841	establish_connection ();
842	}	1029	}
843	}	1030	}
844		1031
845	void	1032	void
846	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1033	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
847	{	1034	{
848	last_activity = NOW;	1035	last_activity = ev_now ();
849		1036
850	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1037	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
851	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1038	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1039
		1040	if (connectmode == conf_node::C_DISABLED)
		1041	return;
852		1042
853	switch (pkt->typ ())	1043	switch (pkt->typ ())
854	{	1044	{
855	case vpn_packet::PT_PING:	1045	case vpn_packet::PT_PING:
		1046	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1047
856	// we send pings instead of auth packets after some retries,	1048	// we send pings instead of auth packets after some retries,
857	// so reset the retry counter and establish a connection	1049	// so reset the retry counter and establish a connection
858	// when we receive a ping.	1050	// when we receive a ping.
859	if (!ictx)	1051	if (!ictx)
860	{	1052	{
861	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
862	send_auth_request (rsi, true);	1054	send_auth_request (rsi, true);
863	}	1055	}
864	else	1056	else
		1057	// we would love to change the socket address here, but ping's aren't
		1058	// authenticated, so we best ignore it.
865	send_ping (rsi, 1); // pong	1059	send_ping (rsi, 1); // pong
866		1060
867	break;	1061	break;
868		1062
869	case vpn_packet::PT_PONG:	1063	case vpn_packet::PT_PONG:
		1064	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1065
		1066	// a PONG might mean that the other side doesn't really know
		1067	// about our desire for communication.
		1068	establish_connection ();
870	break;	1069	break;
871		1070
872	case vpn_packet::PT_RESET:	1071	case vpn_packet::PT_RESET:
873	{	1072	{
874	reset_connection ();	1073	reset_connection ();
875		1074
876	config_packet *p = (config_packet *) pkt;	1075	config_packet *p = (config_packet *) pkt;
877		1076
878	if (!p->chk_config ())	1077	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
879	{
880	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
881	conf->nodename, (const char *)rsi);
882	connectmode = conf_node::C_DISABLED;
883	}
884	else if (connectmode == conf_node::C_ALWAYS)
885	establish_connection ();	1078	establish_connection ();
886	}	1079	}
887	break;	1080	break;
888		1081
889	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
890	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
891	{	1084	{
892	auth_req_packet *p = (auth_req_packet *) pkt;	1085	auth_req_packet *p = (auth_req_packet *)pkt;
893		1086
894	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
895		1090
896	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (memcmp (p->magic, MAGIC, 8))
		1092	{
		1093	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1094	conf->nodename, (const char *)rsi);
		1095	}
		1096	else if (p->chk_config (conf, rsi))
897	{	1097	{
898	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
899	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1099	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
900	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
901	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
902		1102
903	if (p->initiate)	1103	if (p->initiate)
904	send_auth_request (rsi, false);	1104	send_auth_request (rsi, false);
905		1105
906	rsachallenge k;	1106	auth_data auth;
907		1107
908	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1108	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
909	{	1109	{
910	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1110	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
911	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1111	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
912	break;
913	}	1112	}
914	else	1113	else
915	{	1114	{
916	delete octx;	1115	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
917		1116
918	octx = new crypto_ctx (k, 1);	1117	rcv_auth = auth;
919	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1118	have_rcv_auth = true;
920		1119
		1120	send_auth_response (rsi);
		1121
		1122	if (chg)
		1123	{
921	conf->protocols = p->protocols;	1124	conf->protocols = p->protocols;
		1125	features = p->features & config_packet::get_features ();
922		1126
923	send_auth_response (rsi, p->id, k);
924
925	connection_established ();	1127	connection_established (rsi);
926
927	break;	1128	}
928	}	1129	}
		1130
		1131	break;
929	}	1132	}
930	else
931	slog (L_WARN, _("%s(%s): protocol mismatch"),
932	conf->nodename, (const char *)rsi);
933		1133
934	send_reset (rsi);	1134	send_reset (rsi);
935	}	1135	}
936		1136
937	break;	1137	break;
938		1138
939	case vpn_packet::PT_AUTH_RES:	1139	case vpn_packet::PT_AUTH_RES:
940	{	1140	{
941	auth_res_packet *p = (auth_res_packet *) pkt;	1141	auth_res_packet *p = (auth_res_packet *)pkt;
942		1142
943	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1143	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
944		1144
945	if (p->chk_config ())	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
946	{	1146	{
947	if (p->prot_minor != PROTOCOL_MINOR)
948	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
949	conf->nodename, (const char *)rsi,
950	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
951
952	rsachallenge chg;
953
954	if (!rsa_cache.find (p->id, chg))
955	{
956	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
957	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
958	break;
959	}
960	else
961	{
962	crypto_ctx *cctx = new crypto_ctx (chg, 0);
963
964	if (!p->hmac_chk (cctx))
965	{
966	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
967	"could be an attack, or just corruption or an synchronization error"),
968	conf->nodename, (const char *)rsi);
969	break;
970	}
971	else
972	{
973	rsaresponse h;
974
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;
980
981	delete ictx; ictx = cctx;
982
983	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}
1006	}	1149	}
		1150	else if (!have_snd_auth)
		1151	{
		1152	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1153
		1154	have_snd_auth = true;
		1155	connection_established (rsi);
		1156	}
		1157
		1158	break;
1007	}	1159	}
1008		1160
1009	send_reset (rsi);	1161	send_reset (rsi);
1010	break;	1162	break;
1011		1163
…		…
1021	{	1173	{
1022	vpndata_packet *p = (vpndata_packet *)pkt;	1174	vpndata_packet *p = (vpndata_packet *)pkt;
1023		1175
1024	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1028	else	1180	else
1029	{	1181	{
1030	u32 seqno;	1182	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1032		1185
1033	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1034	{	1187	{
1035	vpn->tap->send (d);	1188	vpn->tap->send (d);
1036		1189
1037	if (si != rsi)	1190	if (si != rsi)
1038	{	1191	{
1039	// fast re-sync on connection changes, useful especially for tcp/ip	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
1040	si = rsi;	1194	// {
1041
1042	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1043	conf->nodename, (const char *)si, (const char *)rsi);	1196	conf->nodename, (const char *)si, (const char *)rsi);
		1197
		1198	si = rsi;
		1199
		1200	if (::conf.script_node_change)
		1201	{
		1202	run_script_cb *cb = new run_script_cb;
		1203	cb->set<connection, &connection::script_node_change> (this);
		1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1205	}
		1206
		1207	// }
		1208	//else
		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1210	// conf->nodename, (const char *)si, (const char *)rsi);
1044	}	1211	}
1045
1046	delete d;
1047
1048	break;
1049	}	1212	}
		1213	else if (seqclass == 1) // far history
		1214	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1217	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1218	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1219	else if (seqclass == 3) // reset
		1220	{
		1221	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1222	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1223	send_reset (rsi);
		1224	}
		1225
		1226	delete d;
		1227	break;
1050	}	1228	}
1051	}	1229	}
1052		1230
1053	send_reset (rsi);	1231	send_reset (rsi);
1054	break;	1232	break;
1055		1233
1056	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1057	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058	{	1236	{
1059	connect_req_packet *p = (connect_req_packet *) pkt;	1237	connect_req_packet *p = (connect_req_packet *)pkt;
1060		1238
1061	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1239	if (p->id > 0 && p->id <= vpn->conns.size ())
1062	connection *c = vpn->conns[p->id - 1];
1063	conf->protocols = p->protocols;
1064
1065	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1066	conf->id, p->id, c->ictx && c->octx);
1067
1068	if (c->ictx && c->octx)
1069	{	1240	{
		1241	connection *c = vpn->conns[p->id - 1];
		1242	conf->protocols = p->protocols;
		1243
		1244	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1245	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1246	p->protocols,
		1247	c->ictx && c->octx);
		1248
		1249	if (c->ictx && c->octx)
		1250	{
1070	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1071	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1072	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1073	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1254	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1255	}
		1256	else
		1257	c->establish_connection ();
1074	}	1258	}
1075	else	1259	else
1076	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1077	}	1263	}
1078		1264
1079	break;	1265	break;
1080		1266
1081	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1269	{
1084	connect_info_packet *p = (connect_info_packet *) pkt;	1270	connect_info_packet *p = (connect_info_packet *)pkt;
1085		1271
1086	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1272	if (p->id > 0 && p->id <= vpn->conns.size ())
1087		1273	{
1088	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1089		1275
1090	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1091	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1092	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1093		1279
1094	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1280	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1095	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1281	conf->nodename,
		1282	vpn->conns[p->id - 1]->conf->nodename,
		1283	(const char *)p->si,
		1284	p->protocols,
		1285	protocol,
		1286	p->si.supported_protocols (c->conf),
		1287	!c->ictx && !c->octx);
1096		1288
1097	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1098		1290
1099	if (dsi.valid ())	1291	if (dsi.valid ())
1100	c->send_auth_request (dsi, true);	1292	c->send_auth_request (dsi, true);
		1293	else
		1294	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1295	vpn->conns[p->id - 1]->conf->nodename,
		1296	(const char *)p->si);
		1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1101	}	1302	}
1102		1303
1103	break;	1304	break;
1104		1305
1105	default:	1306	default:
1106	send_reset (rsi);	1307	send_reset (rsi);
1107	break;	1308	break;
1108	}	1309	}
1109	}	1310	}
1110		1311
1111	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1112	{	1314	{
1113	if (NOW >= last_activity + ::conf.keepalive + 30)	1315	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1316
		1317	if (when >= 0)
		1318	w.start (when);
		1319	else if (when < -15)
1114	{	1320	{
1115	reset_connection ();	1321	reset_connection ();
1116	establish_connection ();	1322	establish_connection ();
1117	}	1323	}
1118	else if (NOW < last_activity + ::conf.keepalive)
1119	w.at = last_activity + ::conf.keepalive;
1120	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1121	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1122	{	1326	{
		1327	w.start (3);
1123	send_ping (si);	1328	send_ping (si);
1124	w.at = NOW + 5;
1125	}	1329	}
1126	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1127	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1128	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1129	w.at = last_activity + ::conf.keepalive + 10;	1333	w.start (when + 10);
1130	else	1334	else
1131	reset_connection ();	1335	reset_connection ();
1132	}	1336	}
1133		1337
		1338	void
1134	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1135	{	1340	{
1136	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1341	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1137		1342
1138	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1343	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1344	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1345	THISNODE->protocols);
1139	p->hmac_set (octx);	1346	p->hmac_set (octx);
1140	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1141		1348
1142	delete p;	1349	delete p;
1143	}	1350	}
1144		1351
1145	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1146	{	1354	{
1147	vpn->script_if_up ();
1148
1149	char *env;	1355	char *env;
		1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1360	conf->id & 0xff); putenv (env);
		1361	}
		1362
		1363	void
		1364	connection::script_init_connect_env ()
		1365	{
		1366	vpn->script_init_env ();
		1367
		1368	char *env;
1150	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1369	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1370	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1151	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154	}	1374	}
1155		1375
		1376	inline const char *
1156	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1157	{	1378	{
1158	script_node ();	1379	script_init_connect_env ();
1159		1380
1160	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1161		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1162	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1163	}
1164		1388
		1389	return filename;
		1390	}
		1391
		1392	inline const char *
		1393	connection::script_node_change ()
		1394	{
		1395	script_init_connect_env ();
		1396
		1397	putenv ((char *)"STATE=change");
		1398
		1399	char *filename;
		1400	asprintf (&filename,
		1401	"%s/%s",
		1402	confbase,
		1403	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1404
		1405	return filename;
		1406	}
		1407
		1408	inline const char *
1165	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1166	{	1410	{
1167	script_node ();	1411	script_init_connect_env ();
1168		1412
1169	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1170		1414
1171	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1172	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173		1420
		1421	return filename;
		1422	}
		1423
1174	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn *vpn, conf_node *conf)
1175	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1176	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1177	, keepalive (this, &connection::keepalive_cb)	1427	dns (0),
		1428	#endif
		1429	data_queue(conf->max_ttl, conf->max_queue + 1),
		1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1431	{
		1432	rekey .set<connection, &connection::rekey_cb > (this);
		1433	keepalive .set<connection, &connection::keepalive_cb > (this);
1178	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1179	{	1435
		1436	last_establish_attempt = 0.;
1180	octx = ictx = 0;	1437	octx = ictx = 0;
1181	retry_cnt = 0;
1182		1438
1183	connectmode = conf_node::C_ALWAYS; // initial setting	1439	connectmode = conf->connectmode;
		1440
		1441	// queue a dummy packet to force an initial connection attempt
		1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1443	vpn_queue.put (new net_packet);
		1444
1184	reset_connection ();	1445	reset_connection ();
1185	}	1446	}
1186		1447
1187	connection::~connection ()	1448	connection::~connection ()
1188	{	1449	{
1189	shutdown ();	1450	shutdown ();
1190	}	1451	}
1191		1452
		1453	void
1192	void connection_init ()	1454	connection_init ()
1193	{	1455	{
1194	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1195	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1196	}	1458	}
1197		1459

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