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Comparing gvpe/src/connection.C (file contents):
Revision 1.39 by pcg, Tue Oct 12 12:06:06 2004 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) 2003-2004 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	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
30
31	#include "gettext.h"
32		42
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, auth_mac &mac)
78	{	184	{
79	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
80		186
81	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
82	require (EVP_DigestInit (&ctx, RSA_HASH));	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
86	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
87	}	192	}
88		193
89	struct rsa_entry {	194	void
90	tstamp expire;	195	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	196	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	197	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_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	{ }	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);
138		203
139	} rsa_cache;	204	// eventual response data
140		205	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	206	}
145	w.start (NOW + RSA_TTL);
146		207
147	for (iterator i = begin (); i != end (); )	208	// every use prolongs the expiry
148	if (i->expire <= NOW)	209	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	210	}
154		211
155	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
156		213
157	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)
158	{	216	{
159	if (queue[i])	217	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		218
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;	219	i = 0;
187	j = 0;	220	j = 0;
		221
		222	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	223	}
189		224
190	pkt_queue::~pkt_queue ()	225	pkt_queue::~pkt_queue ()
191	{	226	{
192	for (i = QUEUEDEPTH; --i > 0; )	227	while (net_packet *p = get ())
		228	delete p;
		229
193	delete queue[i];	230	delete [] queue;
194	}	231	}
195		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
196	struct net_rateinfo {	289	struct net_rateinfo
		290	{
197	u32 host;	291	u32 host;
198	double pcnt, diff;	292	double pcnt, diff;
199	tstamp last;	293	tstamp last;
200	};	294	};
201		295
…		…
211		305
212	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	307	bool can (u32 host);
214	};	308	};
215		309
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		311
		312	bool
218	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
219	{	314	{
220	iterator i;	315	iterator i;
221		316
222	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
223	if (i->host == host)	318	if (i->host == host)
224	break;	319	break;
225	else if (i->last < NOW - NRL_EXPIRE)	320	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	321	i = erase (i);
227	else	322	else
228	i++;	323	i++;
229		324
230	if (i == end ())	325	if (i == end ())
…		…
232	net_rateinfo ri;	327	net_rateinfo ri;
233		328
234	ri.host = host;	329	ri.host = host;
235	ri.pcnt = 1.;	330	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	331	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	332	ri.last = ev_now ();
238		333
239	push_front (ri);	334	push_front (ri);
240		335
241	return true;	336	return true;
242	}	337	}
…		…
244	{	339	{
245	net_rateinfo ri (*i);	340	net_rateinfo ri (*i);
246	erase (i);	341	erase (i);
247		342
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	343	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	344	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		345
251	ri.last = NOW;	346	ri.last = ev_now ();
252		347
253	double dif = ri.diff / ri.pcnt;	348	double dif = ri.diff / ri.pcnt;
254		349
255	bool send = dif > NRL_CUTOFF;	350	bool send = dif > NRL_CUTOFF;
256		351
…		…
270		365
271	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
272		367
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
274		369
		370	void
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
276	{	372	{
277	unsigned int xlen;	373	unsigned int xlen;
278		374
279	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
280		376
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
283	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
285	}	381	}
286		382
287	void	383	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	385	{
…		…
298	hmac_gen (ctx);	394	hmac_gen (ctx);
299		395
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	397	}
302		398
		399	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	401	{
305	type = type_;	402	type = type_;
306		403
307	int src = THISNODE->id;	404	int src = THISNODE->id;
308		405
…		…
313		410
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		413
317	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
318	{	423	{
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;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	425	}
		426	};
330		427
331	void	428	void
332	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)
333	{	430	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
337		434
338	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
340		437
341	if (conn->features & ENABLE_COMPRESSION)	438	if (conn->features & FEATURE_COMPRESSION)
342	{	439	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		441
345	if (cl)	442	if (cl)
346	{	443	{
…		…
352	d[1] = cl;	449	d[1] = cl;
353	}	450	}
354	}	451	}
355	#endif	452	#endif
356		453
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		455
359	struct {	456	struct {
360	#if RAND_SIZE	457	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
362	#endif	459	#endif
363	u32 seqno;	460	u32 seqno;
364	} datahdr;	461	} datahdr;
365		462
366	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	464	#if RAND_SIZE
368	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);
369	#endif	468	#endif
370		469
371	require (EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	472	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	494	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
397	u8 *d;	496	u8 *d;
398	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
399		498
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		500
402	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
404		503
405	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	505	d = cdata;
407	else	506	else
408	#endif	507	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
410		509
411	/* 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
412	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	518	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	520	outl += outl2;
416		521
…		…
447	}	552	}
448	};	553	};
449		554
450	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
451	{	556	{
452	// actually, hmaclen cannot be checked because the hmac	557	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;	558	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	559	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	560	u32 cipher_nid, mac_nid, auth_nid;
458		561
459	void setup (ptype type, int dst);	562	void setup (ptype type, int dst);
460	bool chk_config () const;	563	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		564
462	static u8 get_features ()	565	static u8 get_features ()
463	{	566	{
464	u8 f = 0;	567	u8 f = 0;
465	#if ENABLE_COMPRESSION	568	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	569	f |= FEATURE_COMPRESSION;
467	#endif	570	#endif
468	#if ENABLE_ROHC	571	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	572	f |= FEATURE_ROHC;
470	#endif	573	#endif
		574	#if ENABLE_BRIDGING
		575	f |= FEATURE_BRIDGING;
		576	#endif
471	return f;	577	return f;
472	}	578	}
473	};	579	};
474		580
		581	void
475	void config_packet::setup (ptype type, int dst)	582	config_packet::setup (ptype type, int dst)
476	{	583	{
477	prot_major = PROTOCOL_MAJOR;	584	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	585	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	586	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	587	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	588	features = get_features ();
484		589
		590	strncpy ((char *)serial, conf.serial, sizeof (serial));
		591
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	592	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	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 ()));
488		595
489	len = sizeof (*this) - sizeof (net_packet);	596	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	597	set_hdr (type, dst);
491	}	598	}
492		599
493	bool config_packet::chk_config () const	600	bool
		601	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	602	{
495	if (prot_major != PROTOCOL_MAJOR)	603	if (prot_major != PROTOCOL_MAJOR)
496	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);
497	else if (randsize != RAND_SIZE)	606	else if (randsize != RAND_SIZE)
498	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)"),
499	else if (hmaclen != HMACLENGTH)	608	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	609	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	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)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	611	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	612	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	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 ()));
513	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)
514	return true;	626	return true;
		627	}
515		628
516	return false;	629	return false;
517	}	630	}
518		631
519	struct auth_req_packet : config_packet	632	struct auth_req_packet : config_packet // UNPROTECTED
520	{	633	{
521	char magic[8];	634	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	635	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	636	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	637	u8 pad2, pad3;
525	rsaid id;	638	auth_encr encr;
526	rsaencrdata encr;
527		639
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	640	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	641	{
530	config_packet::setup (PT_AUTH_REQ, dst);	642	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	643	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	644	initiate = !!initiate_;
533	protocols = protocols_;	645	protocols = protocols_;
534		646
535	len = sizeof (*this) - sizeof (net_packet);	647	len = sizeof (*this) - sizeof (net_packet);
536	}	648	}
537	};	649	};
538		650
539	struct auth_res_packet : config_packet	651	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	652	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	653	auth_response response;
545		654
546	auth_res_packet (int dst)	655	auth_res_packet (int dst)
547	{	656	{
548	config_packet::setup (PT_AUTH_RES, dst);	657	set_hdr (PT_AUTH_RES, dst);
549		658
550	len = sizeof (*this) - sizeof (net_packet);	659	len = sizeof (*this) - sizeof (net_packet);
551	}	660	}
552	};	661	};
553		662
…		…
583	};	692	};
584		693
585	/////////////////////////////////////////////////////////////////////////////	694	/////////////////////////////////////////////////////////////////////////////
586		695
587	void	696	void
588	connection::connection_established ()	697	connection::connection_established (const sockinfo &rsi)
589	{	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
590	if (ictx && octx)	732	if (ictx && octx)
591	{	733	{
592	connectmode = conf->connectmode;	734	while (tap_packet *p = (tap_packet *)data_queue.get ())
593
594	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey
596	+ (conf->id > THISNODE->id ? 10 : 0));
597	keepalive.start (NOW + ::conf.keepalive);
598
599	// send queued packets
600	if (ictx && octx)
601	{	735	{
602	while (tap_packet *p = (tap_packet *)data_queue.get ())
603	{
604	send_data_packet (p);	736	if (p->len) send_data_packet (p);
605	delete p;	737	delete p;
606	}
607
608	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
609	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;
612	}
613	}	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	}
614	}	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 ());
615	else	755	else
616	{	756	{
617	retry_cnt = 0;	757	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
618	establish_connection.start (NOW + 5);	758	protocol = 0;
619	keepalive.stop ();
620	rekey.stop ();
621	}	759	}
622	}
623
624	void
625	connection::reset_si ()
626	{
627	protocol = best_protocol (THISNODE->protocols & conf->protocols);
628
629	// mask out protocols we cannot establish
630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
632		760
633	si.set (conf, protocol);	761	si.set (conf, protocol);
		762
		763	is_direct = si.valid ();
634	}	764	}
635		765
636	// ensure sockinfo is valid, forward if necessary	766	// ensure sockinfo is valid, forward if necessary
637	const sockinfo &	767	const sockinfo &
638	connection::forward_si (const sockinfo &si) const	768	connection::forward_si (const sockinfo &si) const
639	{	769	{
640	if (!si.valid ())	770	if (!si.valid ())
641	{	771	{
642	connection *r = vpn->find_router ();	772	connection *r = vpn->find_router_for (this);
643		773
644	if (r)	774	if (r)
645	{	775	{
646	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	776	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
647	conf->nodename, r->conf->nodename);	777	conf->nodename, r->conf->nodename);
648	return r->si;	778	return r->si;
649	}	779	}
650	else	780	else
651	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	781	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
652	conf->nodename);	782	conf->nodename);
653	}	783	}
654		784
655	return si;	785	return si;
656	}	786	}
…		…
666	connection::send_ping (const sockinfo &si, u8 pong)	796	connection::send_ping (const sockinfo &si, u8 pong)
667	{	797	{
668	ping_packet *pkt = new ping_packet;	798	ping_packet *pkt = new ping_packet;
669		799
670	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);
671	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	803	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
672		804
673	delete pkt;	805	delete pkt;
674	}	806	}
675		807
…		…
690	void	822	void
691	connection::send_auth_request (const sockinfo &si, bool initiate)	823	connection::send_auth_request (const sockinfo &si, bool initiate)
692	{	824	{
693	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);
694		826
695	rsachallenge chg;	827	generate_auth_data ();
696	rsa_cache.gen (pkt->id, chg);
697	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	828	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
698		829
699	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);
700
701	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
702		832
703	delete pkt;	833	delete pkt;
704	}	834	}
705		835
706	void	836	void
707	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	837	connection::send_auth_response (const sockinfo &si)
708	{	838	{
709	auth_res_packet *pkt = new auth_res_packet (conf->id);	839	auth_res_packet *pkt = new auth_res_packet (conf->id);
710		840
711	pkt->id = id;	841	auth_hash (rcv_auth, pkt->response.mac);
		842	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
712		843
713	rsa_hash (id, chg, pkt->response);
714
715	pkt->hmac_set (octx);
716
717	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);
718
719	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
720		846
721	delete pkt;	847	delete pkt;
722	}	848	}
723		849
724	void	850	void
725	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	851	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
726	{	852	{
727	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	853	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
728	conf->id, rid, (const char *)rsi);	854	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		855	conf->protocols);
729		856
730	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);
731		858
732	r->hmac_set (octx);	859	r->hmac_set (octx);
733	send_vpn_packet (r, si);	860	send_vpn_packet (r, si);
734		861
735	delete r;	862	delete r;
736	}	863	}
737		864
738	void	865	inline void
739	connection::establish_connection_cb (time_watcher &w)	866	connection::establish_connection_cb (ev::timer &w, int revents)
740	{	867	{
741	if (!ictx	868	if (!(ictx && octx)
742	&& conf != THISNODE	869	&& conf != THISNODE
743	&& connectmode != conf_node::C_NEVER	870	&& connectmode != conf_node::C_NEVER
744	&& connectmode != conf_node::C_DISABLED	871	&& connectmode != conf_node::C_DISABLED
745	&& NOW > w.at)	872	&& !w.is_active ())
746	{	873	{
747	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
748		875	// and stop trying. should probably be handled by a per-connection expire handler.
749	if (retry_int < conf->max_retry)	876	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		877	{
		878	reset_connection ();
750	retry_cnt++;	879	return;
751	else	880	}
752	retry_int = conf->max_retry;
753		881
754	w.start (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));
755		887
756	reset_si ();	888	reset_si ();
757		889
758	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);
759	vpn->send_connect_request (conf->id);	896	vpn->send_connect_request (this);
		897	}
760	else	898	else
761	{	899	{
		900	if (si.valid ())
		901	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		902	conf->nodename, (const char *)si);
		903
762	const sockinfo &dsi = forward_si (si);	904	const sockinfo &dsi = forward_si (si);
		905
		906	slow = slow || (dsi.prot & PROT_SLOW);
763		907
764	if (dsi.valid () && auth_rate_limiter.can (dsi))	908	if (dsi.valid () && auth_rate_limiter.can (dsi))
765	{	909	{
766	if (retry_cnt < 4)	910	if (retry_cnt < 4)
767	send_auth_request (dsi, true);	911	send_auth_request (dsi, true);
768	else	912	else
769	send_ping (dsi, 0);	913	send_ping (dsi, 0);
770	}	914	}
771	}	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);
772	}	925	}
773	}	926	}
774		927
775	void	928	void
776	connection::reset_connection ()	929	connection::reset_connection ()
…		…
779	{	932	{
780	slog (L_INFO, _("%s(%s): connection lost"),	933	slog (L_INFO, _("%s(%s): connection lost"),
781	conf->nodename, (const char *)si);	934	conf->nodename, (const char *)si);
782		935
783	if (::conf.script_node_down)	936	if (::conf.script_node_down)
784	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	}
785	}	942	}
786		943
787	delete ictx; ictx = 0;	944	delete ictx; ictx = 0;
788	delete octx; octx = 0;	945	delete octx; octx = 0;
789		946
790	si.host = 0;	947	si.host = 0;
791		948
		949	have_snd_auth = false;
		950	have_rcv_auth = false;
		951	auth_expire = 0.;
		952
792	last_activity = 0;	953	last_activity = 0.;
		954	//last_si_change = 0.;
793	retry_cnt = 0;	955	retry_cnt = 0;
794		956
795	rekey.stop ();	957	rekey.stop ();
796	keepalive.stop ();	958	keepalive.stop ();
797	establish_connection.stop ();	959	establish_connection.stop ();
…		…
804	send_reset (si);	966	send_reset (si);
805		967
806	reset_connection ();	968	reset_connection ();
807	}	969	}
808		970
809	void	971	// poor-man's rekeying
810	connection::rekey_cb (time_watcher &w)	972	inline void
		973	connection::rekey_cb (ev::timer &w, int revents)
811	{	974	{
812	reset_connection ();	975	reset_connection ();
813	establish_connection ();	976	establish_connection ();
814	}	977	}
815		978
…		…
831	if (oseqno > MAX_SEQNO)	994	if (oseqno > MAX_SEQNO)
832	rekey ();	995	rekey ();
833	}	996	}
834		997
835	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
836	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1009	connection::inject_data_packet (tap_packet *pkt)
837	{	1010	{
838	if (ictx && octx)	1011	if (ictx && octx)
839	send_data_packet (pkt);	1012	send_data_packet (pkt);
840	else	1013	else
841	{	1014	{
842	if (!broadcast)//DDDD
843	data_queue.put (new tap_packet (*pkt));	1015	data_queue.put (new tap_packet (*pkt));
844		1016	post_inject_queue ();
845	establish_connection ();
846	}	1017	}
847	}	1018	}
848		1019
		1020	void
849	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1021	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
850	{	1022	{
851	if (ictx && octx)	1023	if (ictx && octx)
852	send_vpn_packet (pkt, si, tos);	1024	send_vpn_packet (pkt, si, tos);
853	else	1025	else
854	{	1026	{
855	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1027	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
856		1028	post_inject_queue ();
857	establish_connection ();
858	}	1029	}
859	}	1030	}
860		1031
861	void	1032	void
862	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1033	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
863	{	1034	{
864	last_activity = NOW;	1035	last_activity = ev_now ();
865		1036
866	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.",
867	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;
868		1042
869	switch (pkt->typ ())	1043	switch (pkt->typ ())
870	{	1044	{
871	case vpn_packet::PT_PING:	1045	case vpn_packet::PT_PING:
		1046	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1047
872	// we send pings instead of auth packets after some retries,	1048	// we send pings instead of auth packets after some retries,
873	// so reset the retry counter and establish a connection	1049	// so reset the retry counter and establish a connection
874	// when we receive a ping.	1050	// when we receive a ping.
875	if (!ictx)	1051	if (!ictx)
876	{	1052	{
877	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
878	send_auth_request (rsi, true);	1054	send_auth_request (rsi, true);
879	}	1055	}
880	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.
881	send_ping (rsi, 1); // pong	1059	send_ping (rsi, 1); // pong
882		1060
883	break;	1061	break;
884		1062
885	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 ();
886	break;	1069	break;
887		1070
888	case vpn_packet::PT_RESET:	1071	case vpn_packet::PT_RESET:
889	{	1072	{
890	reset_connection ();	1073	reset_connection ();
891		1074
892	config_packet *p = (config_packet *) pkt;	1075	config_packet *p = (config_packet *) pkt;
893		1076
894	if (!p->chk_config ())	1077	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
895	{
896	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
897	conf->nodename, (const char *)rsi);
898	connectmode = conf_node::C_DISABLED;
899	}
900	else if (connectmode == conf_node::C_ALWAYS)
901	establish_connection ();	1078	establish_connection ();
902	}	1079	}
903	break;	1080	break;
904		1081
905	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
906	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
907	{	1084	{
908	auth_req_packet *p = (auth_req_packet *) pkt;	1085	auth_req_packet *p = (auth_req_packet *)pkt;
909		1086
910	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);
911		1090
912	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))
913	{	1097	{
914	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
915	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."),
916	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
917	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
918		1102
919	if (p->initiate)	1103	if (p->initiate)
920	send_auth_request (rsi, false);	1104	send_auth_request (rsi, false);
921		1105
922	rsachallenge k;	1106	auth_data auth;
923		1107
924	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1108	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
925	{	1109	{
926	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?"),
927	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));
928	break;
929	}	1112	}
930	else	1113	else
931	{	1114	{
932	delete octx;	1115	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
933		1116
934	octx = new crypto_ctx (k, 1);	1117	rcv_auth = auth;
935	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1118	have_rcv_auth = true;
936		1119
937	// compatibility code, remove when no longer required	1120	send_auth_response (rsi);
938	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
939		1121
		1122	if (chg)
		1123	{
940	conf->protocols = p->protocols;	1124	conf->protocols = p->protocols;
941	features = p->features & config_packet::get_features ();	1125	features = p->features & config_packet::get_features ();
942		1126
943	send_auth_response (rsi, p->id, k);
944
945	connection_established ();	1127	connection_established (rsi);
946
947	break;	1128	}
948	}	1129	}
		1130
		1131	break;
949	}	1132	}
950	else
951	slog (L_WARN, _("%s(%s): protocol mismatch"),
952	conf->nodename, (const char *)rsi);
953		1133
954	send_reset (rsi);	1134	send_reset (rsi);
955	}	1135	}
956		1136
957	break;	1137	break;
958		1138
959	case vpn_packet::PT_AUTH_RES:	1139	case vpn_packet::PT_AUTH_RES:
960	{	1140	{
961	auth_res_packet *p = (auth_res_packet *) pkt;	1141	auth_res_packet *p = (auth_res_packet *)pkt;
962		1142
963	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1143	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
964		1144
965	if (p->chk_config ())	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
966	{	1146	{
967	if (p->prot_minor != PROTOCOL_MINOR)
968	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
969	conf->nodename, (const char *)rsi,
970	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
971
972	rsachallenge chg;
973
974	if (!rsa_cache.find (p->id, chg))
975	{
976	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
977	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
978	break;
979	}
980	else
981	{
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);
983
984	if (!p->hmac_chk (cctx))
985	{
986	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
987	"could be an attack, or just corruption or a synchronization error"),
988	conf->nodename, (const char *)rsi);
989	break;
990	}
991	else
992	{
993	rsaresponse h;
994
995	rsa_hash (p->id, chg, h);
996
997	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
998	{
999	prot_minor = p->prot_minor;
1000
1001	delete ictx; ictx = cctx;
1002
1003	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1004
1005	si = rsi;
1006	protocol = rsi.prot;
1007
1008	connection_established ();
1009
1010	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1011	conf->nodename, (const char *)rsi,
1012	p->prot_major, p->prot_minor);
1013
1014	if (::conf.script_node_up)
1015	run_script (run_script_cb (this, &connection::script_node_up), false);
1016
1017	break;
1018	}
1019	else
1020	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1021	conf->nodename, (const char *)rsi);
1022	}
1023
1024	delete cctx;
1025	}
1026	}	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;
1027	}	1159	}
1028		1160
1029	send_reset (rsi);	1161	send_reset (rsi);
1030	break;	1162	break;
1031		1163
…		…
1041	{	1173	{
1042	vpndata_packet *p = (vpndata_packet *)pkt;	1174	vpndata_packet *p = (vpndata_packet *)pkt;
1043		1175
1044	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1045	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"
1046	"could be an attack, or just corruption or a synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1047	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1048	else	1180	else
1049	{	1181	{
1050	u32 seqno;	1182	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1052		1185
1053	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1054	{	1187	{
1055	vpn->tap->send (d);	1188	vpn->tap->send (d);
1056		1189
1057	if (si != rsi)	1190	if (si != rsi)
1058	{	1191	{
1059	// 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.)
1060	si = rsi;	1194	// {
1061
1062	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1063	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);
1064	}	1211	}
		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);
1065	}	1224	}
1066		1225
1067	delete d;	1226	delete d;
1068	break;	1227	break;
1069	}	1228	}
…		…
1073	break;	1232	break;
1074		1233
1075	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1077	{	1236	{
1078	connect_req_packet *p = (connect_req_packet *) pkt;	1237	connect_req_packet *p = (connect_req_packet *)pkt;
1079		1238
1080	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 ())
1081	connection *c = vpn->conns[p->id - 1];
1082	conf->protocols = p->protocols;
1083
1084	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1085	conf->id, p->id, c->ictx && c->octx);
1086
1087	if (c->ictx && c->octx)
1088	{	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	{
1089	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1090	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1091	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1092	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 ();
1093	}	1258	}
1094	else	1259	else
1095	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1096	}	1263	}
1097		1264
1098	break;	1265	break;
1099		1266
1100	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1101	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1102	{	1269	{
1103	connect_info_packet *p = (connect_info_packet *)pkt;	1270	connect_info_packet *p = (connect_info_packet *)pkt;
1104		1271
1105	if (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 ())
1106	{	1273	{
1107	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1108		1275
1109	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1110	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));
1111	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1112		1279
1113	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]",
1114	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);
1115		1288
1116	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1117		1290
1118	if (dsi.valid ())	1291	if (dsi.valid ())
1119	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);
1120	}	1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1121	}	1302	}
1122		1303
1123	break;	1304	break;
1124		1305
1125	default:	1306	default:
1126	send_reset (rsi);	1307	send_reset (rsi);
1127	break;	1308	break;
1128	}	1309	}
1129	}	1310	}
1130		1311
1131	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1132	{	1314	{
1133	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)
1134	{	1320	{
1135	reset_connection ();	1321	reset_connection ();
1136	establish_connection ();	1322	establish_connection ();
1137	}	1323	}
1138	else if (NOW < last_activity + ::conf.keepalive)
1139	w.start (last_activity + ::conf.keepalive);
1140	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1141	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1142	{	1326	{
		1327	w.start (3);
1143	send_ping (si);	1328	send_ping (si);
1144	w.start (NOW + 5);
1145	}	1329	}
1146	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1147	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1148	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1149	w.start (last_activity + ::conf.keepalive + 10);	1333	w.start (when + 10);
1150	else	1334	else
1151	reset_connection ();	1335	reset_connection ();
1152	}	1336	}
1153		1337
		1338	void
1154	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1155	{	1340	{
1156	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);
1157		1342
1158	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);
1159	p->hmac_set (octx);	1346	p->hmac_set (octx);
1160	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1161		1348
1162	delete p;	1349	delete p;
1163	}	1350	}
1164		1351
1165	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1166	{	1354	{
1167	vpn->script_if_up ();
1168
1169	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;
1170	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);
1171	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1172	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1173	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1174	}	1374	}
1175		1375
		1376	inline const char *
1176	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1177	{	1378	{
1178	script_node ();	1379	script_init_connect_env ();
1179		1380
1180	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1181		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1182	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1183	}
1184		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 *
1185	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1186	{	1410	{
1187	script_node ();	1411	script_init_connect_env ();
1188		1412
1189	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1190		1414
1191	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1192	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1193		1420
		1421	return filename;
		1422	}
		1423
1194	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn *vpn, conf_node *conf)
1195	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1196	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1197	, 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);
1198	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1199	{	1435
		1436	last_establish_attempt = 0.;
1200	octx = ictx = 0;	1437	octx = ictx = 0;
1201	retry_cnt = 0;
1202		1438
1203	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
1204	reset_connection ();	1445	reset_connection ();
1205	}	1446	}
1206		1447
1207	connection::~connection ()	1448	connection::~connection ()
1208	{	1449	{
1209	shutdown ();	1450	shutdown ();
1210	}	1451	}
1211		1452
		1453	void
1212	void connection_init ()	1454	connection_init ()
1213	{	1455	{
1214	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1215	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1216	}	1458	}
1217		1459

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