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Comparing gvpe/src/connection.C (file contents):
Revision 1.34 by pcg, Mon May 10 18:57:07 2004 UTC vs.
Revision 1.102 by root, Thu Jul 18 13:35:16 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
202	// 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.
203	// this implementation ("splay list" ;) is inefficient,	297	// this implementation ("splay list" ;) is inefficient,
204	// but low on resources.	298	// but low on resources.
205	struct net_rate_limiter : list<net_rateinfo>	299	struct net_rate_limiter : list<net_rateinfo>
206	{	300	{
207	# define NRL_ALPHA 1. - 1. / 600. // allow bursts	301	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208	# define NRL_CUTOFF 10. // one event every CUTOFF seconds	302	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209	# define NRL_EXPIRE NRL_CUTOFF * 30. // expire entries after this time	303	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210	# define NRL_MAXDIF NRL_CUTOFF * (1. / (1. - NRL_ALPHA)) // maximum diff /count value	304	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
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
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
458		560
459	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
460	bool chk_config () const;	562	bool chk_config () const;
461		563
462	static u8 get_features ()	564	static u8 get_features ()
…		…
466	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
467	#endif	569	#endif
468	#if ENABLE_ROHC	570	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
470	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
471	return f;	576	return f;
472	}	577	}
473	};	578	};
474		579
		580	void
475	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
476	{	582	{
477	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	586	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	587	features = get_features ();
484		588
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		591	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		592
489	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	594	set_hdr (type, dst);
491	}	595	}
492		596
		597	bool
493	bool config_packet::chk_config () const	598	config_packet::chk_config () const
494	{	599	{
495	if (prot_major != PROTOCOL_MAJOR)	600	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	601	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	602	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	603	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499	else if (hmaclen != HMACLENGTH)
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)))	604	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));	605	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
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)))	606	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));	607	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		608	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		609	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	610	else
514	return true;	611	return true;
515		612
516	return false;	613	return false;
517	}	614	}
518		615
519	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
520	{	617	{
521	char magic[8];	618	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	621	u8 pad2, pad3;
525	rsaid id;	622	auth_encr encr;
526	rsaencrdata encr;
527		623
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	625	{
530	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	628	initiate = !!initiate_;
533	protocols = protocols_;	629	protocols = protocols_;
534		630
535	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
536	}	632	}
537	};	633	};
538		634
539	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
540	{	636	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	637	auth_response response;
545		638
546	auth_res_packet (int dst)	639	auth_res_packet (int dst)
547	{	640	{
548	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
549		642
…		…
583	};	676	};
584		677
585	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
586		679
587	void	680	void
588	connection::connection_established ()	681	connection::connection_established (const sockinfo &rsi)
589	{	682	{
		683	if (!have_snd_auth || !have_rcv_auth)
		684	return;
		685
		686	si = rsi;
		687	protocol = rsi.prot;
		688
		689	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		690	conf->nodename, (const char *)rsi,
		691	is_direct ? "direct" : "forwarded",
		692	PROTOCOL_MAJOR, prot_minor);
		693
		694	if (::conf.script_node_up)
		695	{
		696	run_script_cb *cb = new run_script_cb;
		697	cb->set<connection, &connection::script_node_up> (this);
		698	run_script_queued (cb, _("node-up command execution failed, continuing."));
		699	}
		700
		701	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		702	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		703
		704	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		705	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		706
		707	oiv.reset ();
		708
		709	// make sure rekeying timeouts are slightly asymmetric
		710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		711	rekey.start (rekey_interval, rekey_interval);
		712
		713	keepalive.start (::conf.keepalive);
		714
		715	// send queued packets
590	if (ictx && octx)	716	if (ictx && octx)
591	{	717	{
592	connectmode = conf->connectmode;	718	while (tap_packet *p = (tap_packet *)data_queue.get ())
593
594	rekey.start (NOW + ::conf.rekey);
595	keepalive.start (NOW + ::conf.keepalive);
596
597	// send queued packets
598	if (ictx && octx)
599	{	719	{
600	while (tap_packet *p = (tap_packet *)data_queue.get ())
601	{
602	send_data_packet (p);	720	if (p->len) send_data_packet (p);
603	delete p;	721	delete p;
604	}
605
606	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
607	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;
610	}
611	}	722	}
		723
		724	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		725	{
		726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		727	delete p;
		728	}
612	}	729	}
		730
		731	vpn->connection_established (this);
		732	}
		733
		734	void
		735	connection::reset_si ()
		736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
613	else	739	else
614	{	740	{
615	retry_cnt = 0;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
616	establish_connection.start (NOW + 5);	742	protocol = 0;
617	keepalive.stop ();
618	rekey.stop ();
619	}	743	}
620	}
621
622	void
623	connection::reset_si ()
624	{
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);
626
627	// mask out protocols we cannot establish
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
630		744
631	si.set (conf, protocol);	745	si.set (conf, protocol);
		746
		747	is_direct = si.valid ();
632	}	748	}
633		749
634	// ensure sockinfo is valid, forward if necessary	750	// ensure sockinfo is valid, forward if necessary
635	const sockinfo &	751	const sockinfo &
636	connection::forward_si (const sockinfo &si) const	752	connection::forward_si (const sockinfo &si) const
637	{	753	{
638	if (!si.valid ())	754	if (!si.valid ())
639	{	755	{
640	connection *r = vpn->find_router ();	756	connection *r = vpn->find_router_for (this);
641		757
642	if (r)	758	if (r)
643	{	759	{
644	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	760	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
645	conf->nodename, r->conf->nodename);	761	conf->nodename, r->conf->nodename);
646	return r->si;	762	return r->si;
647	}	763	}
648	else	764	else
649	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	765	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
650	conf->nodename);	766	conf->nodename);
651	}	767	}
652		768
653	return si;	769	return si;
654	}	770	}
…		…
664	connection::send_ping (const sockinfo &si, u8 pong)	780	connection::send_ping (const sockinfo &si, u8 pong)
665	{	781	{
666	ping_packet *pkt = new ping_packet;	782	ping_packet *pkt = new ping_packet;
667		783
668	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	784	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		785
		786	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
669	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	787	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		788
671	delete pkt;	789	delete pkt;
672	}	790	}
673		791
…		…
688	void	806	void
689	connection::send_auth_request (const sockinfo &si, bool initiate)	807	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	808	{
691	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	809	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
692		810
693	rsachallenge chg;	811	generate_auth_data ();
694	rsa_cache.gen (pkt->id, chg);
695	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	812	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
696		813
697	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
698
699	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
700		816
701	delete pkt;	817	delete pkt;
702	}	818	}
703		819
704	void	820	void
705	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	821	connection::send_auth_response (const sockinfo &si)
706	{	822	{
707	auth_res_packet *pkt = new auth_res_packet (conf->id);	823	auth_res_packet *pkt = new auth_res_packet (conf->id);
708		824
709	pkt->id = id;	825	auth_hash (rcv_auth, pkt->response.mac);
		826	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
710		827
711	rsa_hash (id, chg, pkt->response);
712
713	pkt->hmac_set (octx);
714
715	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	828	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
716
717	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
718		830
719	delete pkt;	831	delete pkt;
720	}	832	}
721		833
722	void	834	void
723	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
724	{	836	{
725	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
726	conf->id, rid, (const char *)rsi);	838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
727		840
728	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
729		842
730	r->hmac_set (octx);	843	r->hmac_set (octx);
731	send_vpn_packet (r, si);	844	send_vpn_packet (r, si);
732		845
733	delete r;	846	delete r;
734	}	847	}
735		848
736	void	849	inline void
737	connection::establish_connection_cb (time_watcher &w)	850	connection::establish_connection_cb (ev::timer &w, int revents)
738	{	851	{
739	if (!ictx	852	if (!(ictx && octx)
740	&& conf != THISNODE	853	&& conf != THISNODE
741	&& connectmode != conf_node::C_NEVER	854	&& connectmode != conf_node::C_NEVER
742	&& connectmode != conf_node::C_DISABLED	855	&& connectmode != conf_node::C_DISABLED
743	&& NOW > w.at)	856	&& !w.is_active ())
744	{	857	{
745	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
746		859	// and stop trying. should probably be handled by a per-connection expire handler.
747	if (retry_int < 3600 * 8)	860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		861	{
		862	reset_connection ();
748	retry_cnt++;	863	return;
		864	}
749		865
750	w.start (NOW + retry_int);	866	last_establish_attempt = ev_now ();
		867
		868	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		869	? (retry_cnt & 3) + 1
		870	: 1 << (retry_cnt >> 2));
751		871
752	reset_si ();	872	reset_si ();
753		873
754	if (si.prot && !si.host)	874	bool slow = si.prot & PROT_SLOW;
		875
		876	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		877	{
		878	/*TODO*/ /* start the timer so we don't recurse endlessly */
		879	w.start (1);
755	vpn->send_connect_request (conf->id);	880	vpn->send_connect_request (this);
		881	}
756	else	882	else
757	{	883	{
		884	if (si.valid ())
		885	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		886	conf->nodename, (const char *)si);
		887
758	const sockinfo &dsi = forward_si (si);	888	const sockinfo &dsi = forward_si (si);
		889
		890	slow = slow || (dsi.prot & PROT_SLOW);
759		891
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	892	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	893	{
762	if (retry_cnt < 4)	894	if (retry_cnt < 4)
763	send_auth_request (dsi, true);	895	send_auth_request (dsi, true);
764	else	896	else
765	send_ping (dsi, 0);	897	send_ping (dsi, 0);
766	}	898	}
767	}	899	}
		900
		901	retry_int *= slow ? 8. : 0.9;
		902
		903	if (retry_int < conf->max_retry)
		904	retry_cnt++;
		905	else
		906	retry_int = conf->max_retry;
		907
		908	w.start (retry_int);
768	}	909	}
769	}	910	}
770		911
771	void	912	void
772	connection::reset_connection ()	913	connection::reset_connection ()
…		…
775	{	916	{
776	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
777	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
778		919
779	if (::conf.script_node_down)	920	if (::conf.script_node_down)
780	run_script (run_script_cb (this, &connection::script_node_down), false);	921	{
		922	run_script_cb *cb = new run_script_cb;
		923	cb->set<connection, &connection::script_node_down> (this);
		924	run_script_queued (cb, _("node-down command execution failed, continuing."));
		925	}
781	}	926	}
782		927
783	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
784	delete octx; octx = 0;	929	delete octx; octx = 0;
785		930
786	si.host= 0;	931	si.host = 0;
787		932
		933	have_snd_auth = false;
		934	have_rcv_auth = false;
		935	auth_expire = 0.;
		936
788	last_activity = 0;	937	last_activity = 0.;
		938	//last_si_change = 0.;
789	retry_cnt = 0;	939	retry_cnt = 0;
790		940
791	rekey.stop ();	941	rekey.stop ();
792	keepalive.stop ();	942	keepalive.stop ();
793	establish_connection.stop ();	943	establish_connection.stop ();
…		…
800	send_reset (si);	950	send_reset (si);
801		951
802	reset_connection ();	952	reset_connection ();
803	}	953	}
804		954
805	void	955	// poor-man's rekeying
806	connection::rekey_cb (time_watcher &w)	956	inline void
		957	connection::rekey_cb (ev::timer &w, int revents)
807	{	958	{
808	reset_connection ();	959	reset_connection ();
809	establish_connection ();	960	establish_connection ();
810	}	961	}
811		962
…		…
827	if (oseqno > MAX_SEQNO)	978	if (oseqno > MAX_SEQNO)
828	rekey ();	979	rekey ();
829	}	980	}
830		981
831	void	982	void
		983	connection::post_inject_queue ()
		984	{
		985	// force a connection every now and when when packets are sent (max 1/s)
		986	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		987	establish_connection.stop ();
		988
		989	establish_connection ();
		990	}
		991
		992	void
832	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	993	connection::inject_data_packet (tap_packet *pkt)
833	{	994	{
834	if (ictx && octx)	995	if (ictx && octx)
835	send_data_packet (pkt);	996	send_data_packet (pkt);
836	else	997	else
837	{	998	{
838	if (!broadcast)//DDDD
839	data_queue.put (new tap_packet (*pkt));	999	data_queue.put (new tap_packet (*pkt));
840		1000	post_inject_queue ();
841	establish_connection ();
842	}	1001	}
843	}	1002	}
844		1003
		1004	void
845	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1005	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
846	{	1006	{
847	if (ictx && octx)	1007	if (ictx && octx)
848	send_vpn_packet (pkt, si, tos);	1008	send_vpn_packet (pkt, si, tos);
849	else	1009	else
850	{	1010	{
851	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1011	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
852		1012	post_inject_queue ();
853	establish_connection ();
854	}	1013	}
855	}	1014	}
856		1015
857	void	1016	void
858	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1017	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
859	{	1018	{
860	last_activity = NOW;	1019	last_activity = ev_now ();
861		1020
862	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1021	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
863	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1022	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1023
		1024	if (connectmode == conf_node::C_DISABLED)
		1025	return;
864		1026
865	switch (pkt->typ ())	1027	switch (pkt->typ ())
866	{	1028	{
867	case vpn_packet::PT_PING:	1029	case vpn_packet::PT_PING:
		1030	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1031
868	// we send pings instead of auth packets after some retries,	1032	// we send pings instead of auth packets after some retries,
869	// so reset the retry counter and establish a connection	1033	// so reset the retry counter and establish a connection
870	// when we receive a ping.	1034	// when we receive a ping.
871	if (!ictx)	1035	if (!ictx)
872	{	1036	{
873	if (auth_rate_limiter.can (rsi))	1037	if (auth_rate_limiter.can (rsi))
874	send_auth_request (rsi, true);	1038	send_auth_request (rsi, true);
875	}	1039	}
876	else	1040	else
		1041	// we would love to change the socket address here, but ping's aren't
		1042	// authenticated, so we best ignore it.
877	send_ping (rsi, 1); // pong	1043	send_ping (rsi, 1); // pong
878		1044
879	break;	1045	break;
880		1046
881	case vpn_packet::PT_PONG:	1047	case vpn_packet::PT_PONG:
		1048	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1049
		1050	// a PONG might mean that the other side doesn't really know
		1051	// about our desire for communication.
		1052	establish_connection ();
882	break;	1053	break;
883		1054
884	case vpn_packet::PT_RESET:	1055	case vpn_packet::PT_RESET:
885	{	1056	{
886	reset_connection ();	1057	reset_connection ();
887		1058
888	config_packet *p = (config_packet *) pkt;	1059	config_packet *p = (config_packet *) pkt;
889		1060
890	if (!p->chk_config ())	1061	if (!p->chk_config ())
891	{	1062	{
892	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1063	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
893	conf->nodename, (const char *)rsi);	1064	conf->nodename, (const char *)rsi);
894	connectmode = conf_node::C_DISABLED;	1065	connectmode = conf_node::C_DISABLED;
895	}	1066	}
896	else if (connectmode == conf_node::C_ALWAYS)	1067	else if (connectmode == conf_node::C_ALWAYS)
897	establish_connection ();	1068	establish_connection ();
…		…
899	break;	1070	break;
900		1071
901	case vpn_packet::PT_AUTH_REQ:	1072	case vpn_packet::PT_AUTH_REQ:
902	if (auth_rate_limiter.can (rsi))	1073	if (auth_rate_limiter.can (rsi))
903	{	1074	{
904	auth_req_packet *p = (auth_req_packet *) pkt;	1075	auth_req_packet *p = (auth_req_packet *)pkt;
905		1076
906	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1077	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1078	conf->nodename, p->initiate ? "initiate" : "reply",
		1079	p->protocols, p->features);
907		1080
908	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1081	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
909	{	1082	{
910	if (p->prot_minor != PROTOCOL_MINOR)	1083	if (p->prot_minor != PROTOCOL_MINOR)
911	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1084	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
912	conf->nodename, (const char *)rsi,	1085	conf->nodename, (const char *)rsi,
913	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1086	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
914		1087
915	if (p->initiate)	1088	if (p->initiate)
916	send_auth_request (rsi, false);	1089	send_auth_request (rsi, false);
917		1090
918	rsachallenge k;	1091	auth_data auth;
919		1092
920	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1093	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
921	{	1094	{
922	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1095	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
923	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1096	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
924	break;
925	}	1097	}
926	else	1098	else
927	{	1099	{
928	delete octx;	1100	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
929		1101
930	octx = new crypto_ctx (k, 1);	1102	rcv_auth = auth;
931	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1103	have_rcv_auth = true;
932		1104
933	// compatibility code, remove when no longer required	1105	send_auth_response (rsi);
934	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
935		1106
		1107	if (chg)
		1108	{
936	conf->protocols = p->protocols;	1109	conf->protocols = p->protocols;
937	features = p->features & config_packet::get_features ();	1110	features = p->features & config_packet::get_features ();
938		1111
939	send_auth_response (rsi, p->id, k);
940
941	connection_established ();	1112	connection_established (rsi);
942
943	break;	1113	}
944	}	1114	}
		1115
		1116	break;
945	}	1117	}
946	else	1118	else
947	slog (L_WARN, _("%s(%s): protocol mismatch"),	1119	slog (L_WARN, _("%s(%s): protocol mismatch."),
948	conf->nodename, (const char *)rsi);	1120	conf->nodename, (const char *)rsi);
949		1121
950	send_reset (rsi);	1122	send_reset (rsi);
951	}	1123	}
952		1124
953	break;	1125	break;
954		1126
955	case vpn_packet::PT_AUTH_RES:	1127	case vpn_packet::PT_AUTH_RES:
956	{	1128	{
957	auth_res_packet *p = (auth_res_packet *) pkt;	1129	auth_res_packet *p = (auth_res_packet *)pkt;
958		1130
959	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1131	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
960		1132
961	if (p->chk_config ())	1133	if (p->chk_config ())
962	{	1134	{
963	if (p->prot_minor != PROTOCOL_MINOR)	1135	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
964	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
965	conf->nodename, (const char *)rsi,
966	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
967
968	rsachallenge chg;
969
970	if (!rsa_cache.find (p->id, chg))
971	{	1136	{
972	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1137	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
973	conf->nodename, (const char *)rsi);	1138	conf->nodename, (const char *)rsi);
974	break;
975	}	1139	}
976	else	1140	else if (!have_snd_auth)
977	{	1141	{
978	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1142	if (p->prot_minor != PROTOCOL_MINOR)
979		1143	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
980	if (!p->hmac_chk (cctx))
981	{
982	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
983	"could be an attack, or just corruption or a synchronization error"),
984	conf->nodename, (const char *)rsi);	1144	conf->nodename, (const char *)rsi,
985	break;	1145	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
986	}
987	else
988	{
989	rsaresponse h;
990		1146
991	rsa_hash (p->id, chg, h);
992
993	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
994	{
995	prot_minor = p->prot_minor;	1147	prot_minor = p->prot_minor;
		1148	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
996		1149
997	delete ictx; ictx = cctx;	1150	have_snd_auth = true;
998
999	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1000
1001	si = rsi;
1002	protocol = rsi.prot;
1003
1004	connection_established ();	1151	connection_established (rsi);
1005
1006	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1007	conf->nodename, (const char *)rsi,
1008	p->prot_major, p->prot_minor);
1009
1010	if (::conf.script_node_up)
1011	run_script (run_script_cb (this, &connection::script_node_up), false);
1012
1013	break;
1014	}
1015	else
1016	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1017	conf->nodename, (const char *)rsi);
1018	}
1019
1020	delete cctx;
1021	}	1152	}
		1153
		1154	break;
1022	}	1155	}
1023	}	1156	}
1024		1157
1025	send_reset (rsi);	1158	send_reset (rsi);
1026	break;	1159	break;
…		…
1037	{	1170	{
1038	vpndata_packet *p = (vpndata_packet *)pkt;	1171	vpndata_packet *p = (vpndata_packet *)pkt;
1039		1172
1040	if (!p->hmac_chk (ictx))	1173	if (!p->hmac_chk (ictx))
1041	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1174	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1042	"could be an attack, or just corruption or a synchronization error"),	1175	"could be an attack, or just corruption or a synchronization error."),
1043	conf->nodename, (const char *)rsi);	1176	conf->nodename, (const char *)rsi);
1044	else	1177	else
1045	{	1178	{
1046	u32 seqno;	1179	u32 seqno;
1047	tap_packet *d = p->unpack (this, seqno);	1180	tap_packet *d = p->unpack (this, seqno);
		1181	int seqclass = iseqno.seqno_classify (seqno);
1048		1182
1049	if (iseqno.recv_ok (seqno))	1183	if (seqclass == 0) // ok
1050	{	1184	{
1051	vpn->tap->send (d);	1185	vpn->tap->send (d);
1052		1186
1053	if (si != rsi)	1187	if (si != rsi)
1054	{	1188	{
1055	// fast re-sync on connection changes, useful especially for tcp/ip	1189	// fast re-sync on source address changes, useful especially for tcp/ip
		1190	//if (last_si_change < ev_now () + 5.)
1056	si = rsi;	1191	// {
1057
1058	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1192	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1059	conf->nodename, (const char *)si, (const char *)rsi);	1193	conf->nodename, (const char *)si, (const char *)rsi);
		1194
		1195	si = rsi;
		1196
		1197	if (::conf.script_node_change)
		1198	{
		1199	run_script_cb *cb = new run_script_cb;
		1200	cb->set<connection, &connection::script_node_change> (this);
		1201	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1202	}
		1203
		1204	// }
		1205	//else
		1206	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1207	// conf->nodename, (const char *)si, (const char *)rsi);
1060	}	1208	}
		1209	}
		1210	else if (seqclass == 1) // far history
		1211	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1214	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 3) // reset
		1217	{
		1218	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1219	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1220	send_reset (rsi);
1061	}	1221	}
1062		1222
1063	delete d;	1223	delete d;
1064	break;	1224	break;
1065	}	1225	}
…		…
1069	break;	1229	break;
1070		1230
1071	case vpn_packet::PT_CONNECT_REQ:	1231	case vpn_packet::PT_CONNECT_REQ:
1072	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1232	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1073	{	1233	{
1074	connect_req_packet *p = (connect_req_packet *) pkt;	1234	connect_req_packet *p = (connect_req_packet *)pkt;
1075		1235
1076	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1236	if (p->id > 0 && p->id <= vpn->conns.size ())
1077	connection *c = vpn->conns[p->id - 1];
1078	conf->protocols = p->protocols;
1079
1080	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1081	conf->id, p->id, c->ictx && c->octx);
1082
1083	if (c->ictx && c->octx)
1084	{	1237	{
		1238	connection *c = vpn->conns[p->id - 1];
		1239	conf->protocols = p->protocols;
		1240
		1241	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1242	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1243	p->protocols,
		1244	c->ictx && c->octx);
		1245
		1246	if (c->ictx && c->octx)
		1247	{
1085	// send connect_info packets to both sides, in case one is	1248	// send connect_info packets to both sides, in case one is
1086	// behind a nat firewall (or both ;)	1249	// behind a nat firewall (or both ;)
1087	c->send_connect_info (conf->id, si, conf->protocols);	1250	c->send_connect_info (conf->id, si, conf->protocols);
1088	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1251	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1252	}
		1253	else
		1254	c->establish_connection ();
1089	}	1255	}
1090	else	1256	else
1091	c->establish_connection ();	1257	slog (L_WARN,
		1258	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1259	p->id);
1092	}	1260	}
1093		1261
1094	break;	1262	break;
1095		1263
1096	case vpn_packet::PT_CONNECT_INFO:	1264	case vpn_packet::PT_CONNECT_INFO:
1097	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1265	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1098	{	1266	{
1099	connect_info_packet *p = (connect_info_packet *) pkt;	1267	connect_info_packet *p = (connect_info_packet *)pkt;
1100		1268
1101	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1269	if (p->id > 0 && p->id <= vpn->conns.size ())
1102		1270	{
1103	connection *c = vpn->conns[p->id - 1];	1271	connection *c = vpn->conns[p->id - 1];
1104		1272
1105	c->conf->protocols = p->protocols;	1273	c->conf->protocols = p->protocols;
1106	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1274	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1107	p->si.upgrade_protocol (protocol, c->conf);	1275	p->si.upgrade_protocol (protocol, c->conf);
1108		1276
1109	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1277	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1110	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1278	conf->nodename,
		1279	vpn->conns[p->id - 1]->conf->nodename,
		1280	(const char *)p->si,
		1281	p->protocols,
		1282	protocol,
		1283	p->si.supported_protocols (c->conf),
		1284	!c->ictx && !c->octx);
1111		1285
1112	const sockinfo &dsi = forward_si (p->si);	1286	const sockinfo &dsi = forward_si (p->si);
1113		1287
1114	if (dsi.valid ())	1288	if (dsi.valid ())
1115	c->send_auth_request (dsi, true);	1289	c->send_auth_request (dsi, true);
		1290	else
		1291	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si);
		1294	}
		1295	else
		1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
1116	}	1299	}
1117		1300
1118	break;	1301	break;
1119		1302
1120	default:	1303	default:
1121	send_reset (rsi);	1304	send_reset (rsi);
1122	break;	1305	break;
1123	}	1306	}
1124	}	1307	}
1125		1308
1126	void connection::keepalive_cb (time_watcher &w)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1127	{	1311	{
1128	if (NOW >= last_activity + ::conf.keepalive + 30)	1312	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1313
		1314	if (when >= 0)
		1315	w.start (when);
		1316	else if (when < -15)
1129	{	1317	{
1130	reset_connection ();	1318	reset_connection ();
1131	establish_connection ();	1319	establish_connection ();
1132	}	1320	}
1133	else if (NOW < last_activity + ::conf.keepalive)
1134	w.start (last_activity + ::conf.keepalive);
1135	else if (conf->connectmode != conf_node::C_ONDEMAND	1321	else if (conf->connectmode != conf_node::C_ONDEMAND
1136	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1322	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1137	{	1323	{
		1324	w.start (3);
1138	send_ping (si);	1325	send_ping (si);
1139	w.start (NOW + 5);
1140	}	1326	}
1141	else if (NOW < last_activity + ::conf.keepalive + 10)	1327	else if (when >= -10)
1142	// hold ondemand connections implicitly a few seconds longer	1328	// hold ondemand connections implicitly a few seconds longer
1143	// should delete octx, though, or something like that ;)	1329	// should delete octx, though, or something like that ;)
1144	w.start (last_activity + ::conf.keepalive + 10);	1330	w.start (when + 10);
1145	else	1331	else
1146	reset_connection ();	1332	reset_connection ();
1147	}	1333	}
1148		1334
		1335	void
1149	void connection::send_connect_request (int id)	1336	connection::send_connect_request (int id)
1150	{	1337	{
1151	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1338	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1152		1339
1153	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1340	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1341	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1342	THISNODE->protocols);
1154	p->hmac_set (octx);	1343	p->hmac_set (octx);
1155	send_vpn_packet (p, si);	1344	send_vpn_packet (p, si);
1156		1345
1157	delete p;	1346	delete p;
1158	}	1347	}
1159		1348
1160	void connection::script_node ()	1349	void
		1350	connection::script_init_env (const char *ext)
1161	{	1351	{
1162	vpn->script_if_up ();
1163
1164	char *env;	1352	char *env;
		1353	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1354	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1355	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1356	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1357	conf->id & 0xff); putenv (env);
		1358	}
		1359
		1360	void
		1361	connection::script_init_connect_env ()
		1362	{
		1363	vpn->script_init_env ();
		1364
		1365	char *env;
1165	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1366	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1367	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1166	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1368	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1167	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1369	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1168	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1370	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1169	}	1371	}
1170		1372
		1373	inline const char *
1171	const char *connection::script_node_up ()	1374	connection::script_node_up ()
1172	{	1375	{
1173	script_node ();	1376	script_init_connect_env ();
1174		1377
1175	putenv ("STATE=up");	1378	putenv ((char *)"STATE=up");
1176		1379
		1380	char *filename;
		1381	asprintf (&filename,
		1382	"%s/%s",
		1383	confbase,
1177	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1384	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1178	}
1179		1385
		1386	return filename;
		1387	}
		1388
		1389	inline const char *
		1390	connection::script_node_change ()
		1391	{
		1392	script_init_connect_env ();
		1393
		1394	putenv ((char *)"STATE=change");
		1395
		1396	char *filename;
		1397	asprintf (&filename,
		1398	"%s/%s",
		1399	confbase,
		1400	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1401
		1402	return filename;
		1403	}
		1404
		1405	inline const char *
1180	const char *connection::script_node_down ()	1406	connection::script_node_down ()
1181	{	1407	{
1182	script_node ();	1408	script_init_connect_env ();
1183		1409
1184	putenv ("STATE=down");	1410	putenv ((char *)"STATE=down");
1185		1411
1186	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1412	char *filename;
1187	}	1413	asprintf (&filename,
		1414	"%s/%s",
		1415	confbase,
		1416	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1188		1417
		1418	return filename;
		1419	}
		1420
1189	connection::connection(struct vpn *vpn_)	1421	connection::connection (struct vpn *vpn, conf_node *conf)
1190	: vpn(vpn_)	1422	: vpn(vpn), conf(conf),
1191	, rekey (this, &connection::rekey_cb)	1423	#if ENABLE_DNS
1192	, keepalive (this, &connection::keepalive_cb)	1424	dns (0),
		1425	#endif
		1426	data_queue(conf->max_ttl, conf->max_queue + 1),
		1427	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1428	{
		1429	rekey .set<connection, &connection::rekey_cb > (this);
		1430	keepalive .set<connection, &connection::keepalive_cb > (this);
1193	, establish_connection (this, &connection::establish_connection_cb)	1431	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1194	{	1432
		1433	last_establish_attempt = 0.;
1195	octx = ictx = 0;	1434	octx = ictx = 0;
1196	retry_cnt = 0;
1197		1435
1198	connectmode = conf_node::C_ALWAYS; // initial setting	1436	connectmode = conf->connectmode;
		1437
		1438	// queue a dummy packet to force an initial connection attempt
		1439	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1440	vpn_queue.put (new net_packet);
		1441
1199	reset_connection ();	1442	reset_connection ();
1200	}	1443	}
1201		1444
1202	connection::~connection ()	1445	connection::~connection ()
1203	{	1446	{
1204	shutdown ();	1447	shutdown ();
1205	}	1448	}
1206		1449
		1450	void
1207	void connection_init ()	1451	connection_init ()
1208	{	1452	{
1209	auth_rate_limiter.clear ();	1453	auth_rate_limiter.clear ();
1210	reset_rate_limiter.clear ();	1454	reset_rate_limiter.clear ();
1211	}	1455	}
1212		1456

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