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Comparing gvpe/src/connection.C (file contents):
Revision 1.63 by pcg, Sun Dec 2 00:45:41 2007 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
30		50
31	#include "conf.h"	51	#include "conf.h"
32	#include "slog.h"	52	#include "slog.h"
33	#include "device.h"	53	#include "device.h"
34	#include "vpn.h"	54	#include "vpn.h"
35	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
36		57
37	#include "netcompat.h"	58	#include "netcompat.h"
38		59
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		61
45	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
46	#define HLOG 15	63	#define HLOG 15
47	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
50		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb *cb, const char *warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
51	struct crypto_ctx	112	struct crypto_ctx
52	{	113	{
53	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	115	HMAC_CTX hctx;
55		116
56	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	118	~crypto_ctx ();
58	};	119	};
59		120
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
62	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	153	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	154	}
67		155
68	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
69	{	157	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
72	}	160	}
73		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
74	static void	189	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	191	{
77	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	196	}
86		197
87	struct rsa_entry	198	void
		199	connection::generate_auth_data ()
88	{	200	{
89	tstamp expire;	201	if (auth_expire < ev_now ())
90	rsaid id;
91	rsachallenge chg;
92	};
93
94	struct rsa_cache : list<rsa_entry>
95	{
96	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
97
98	bool find (const rsaid &id, rsachallenge &chg)
99	{
100	for (iterator i = begin (); i != end (); ++i)
101	{	202	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	203	// request data
103	{	204	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
105		206
106	erase (i);	207	// eventual response data
107	return true;	208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	209	}
110		210
111	if (!cleaner.is_active ())	211	// every use prolongs the expiry
112	cleaner.again ();
113
114	return false;
115	}
116
117	void gen (rsaid &id, rsachallenge &chg)
118	{
119	rsa_entry e;
120
121	RAND_bytes ((unsigned char *)&id, sizeof id);
122	RAND_bytes ((unsigned char *)&chg, sizeof chg);
123
124	e.expire = ev_now () + RSA_TTL;	212	auth_expire = ev_now () + AUTH_TTL;
125	e.id = id;
126	memcpy (&e.chg, &chg, sizeof chg);
127
128	push_back (e);
129
130	if (!cleaner.is_active ())
131	cleaner.again ();
132	}
133
134	rsa_cache ()
135	: cleaner (this, &rsa_cache::cleaner_cb)
136	{
137	cleaner.set (RSA_TTL, RSA_TTL);
138	}
139
140	} rsa_cache;
141
142	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
143	{
144	if (empty ())
145	w.stop ();
146	else
147	{
148	for (iterator i = begin (); i != end (); )
149	if (i->expire <= ev_now ())
150	i = erase (i);
151	else
152	++i;
153	}
154	}	213	}
155		214
156	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
157		216
158	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
159	{	219	{
160	if (queue[i])	220	queue = new pkt [max_queue];
161	{
162	delete queue[i];
163	j = (j + 1) % QUEUEDEPTH;
164	}
165		221
166	queue[i] = p;
167
168	i = (i + 1) % QUEUEDEPTH;
169	}
170
171	net_packet *pkt_queue::get ()
172	{
173	net_packet *p = queue[j];
174
175	if (p)
176	{
177	queue[j] = 0;
178	j = (j + 1) % QUEUEDEPTH;
179	}
180
181	return p;
182	}
183
184	pkt_queue::pkt_queue ()
185	{
186	memset (queue, 0, sizeof (queue));
187	i = 0;	222	i = 0;
188	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
189	}	226	}
190		227
191	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
192	{	229	{
193	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
194	delete queue[i];	233	delete [] queue;
		234	}
		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
195	}	290	}
196		291
197	struct net_rateinfo	292	struct net_rateinfo
198	{	293	{
199	u32 host;	294	u32 host;
…		…
213		308
214	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	310	bool can (u32 host);
216	};	311	};
217		312
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		314
		315	bool
220	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
221	{	317	{
222	iterator i;	318	iterator i;
223		319
224	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
225	if (i->host == host)	321	if (i->host == host)
…		…
270	}	366	}
271	}	367	}
272		368
273	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
274		370
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	373	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
282		375
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	379	}
288		380
289	void	381	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	383	{
292	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		385	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	387	}
296		388
297	bool	389	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	391	{
300	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		393	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	395	}
304		396
		397	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	399	{
307	type = type_;	400	type = type_;
308		401
309	int src = THISNODE->id;	402	int src = THISNODE->id;
310		403
…		…
315		408
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		411
319	struct vpndata_packet : vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
320	{	421	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
322
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	423	}
		424	};
332		425
333	void	426	void
334	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
335	{	428	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
339		432
340	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
342		435
343	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
344	{	437	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		439
347	if (cl)	440	if (cl)
348	{	441	{
…		…
354	d[1] = cl;	447	d[1] = cl;
355	}	448	}
356	}	449	}
357	#endif	450	#endif
358		451
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
360		453
361	struct {	454	struct {
362	#if RAND_SIZE	455	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
364	#endif	457	#endif
365	u32 seqno;	458	u32 seqno;
366	} datahdr;	459	} datahdr;
367		460
368	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE	462	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	// NB: a constant (per session) random prefix
		464	// is likely enough, but we don't take any chances.
		465	conn->oiv.get (datahdr.rnd, RAND_SIZE);
371	#endif	466	#endif
372		467
373	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
397	int outl = 0, outl2;	492	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
399	u8 *d;	494	u8 *d;
400	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
401		496
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
403		498
404	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
406		501
407	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	503	d = cdata;
409	else	504	else
410	#endif	505	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
412		507
413	/* this overwrites part of the src mac, but we fix that later */	508	// we play do evil games with the struct layout atm.
		509	// pending better solutions, we at least do some verification.
		510	// this is fine, as we left ISO territory long ago.
		511	require (DATAHDR <= 16);
		512	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		513
		514	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	516	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	518	outl += outl2;
418		519
…		…
449	}	550	}
450	};	551	};
451		552
452	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
453	{	554	{
454	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
460		559
461	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
462	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		562
464	static u8 get_features ()	563	static u8 get_features ()
465	{	564	{
466	u8 f = 0;	565	u8 f = 0;
467	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
…		…
475	#endif	574	#endif
476	return f;	575	return f;
477	}	576	}
478	};	577	};
479		578
		579	void
480	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
481	{	581	{
482	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
483	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
484	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
485	hmaclen = HMACLENGTH;
486	flags = 0;	585	flags = 0;
487	challengelen = sizeof (rsachallenge);
488	features = get_features ();	586	features = get_features ();
489		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
490	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
491	digest_nid = htonl (EVP_MD_type (RSA_HASH));
492	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
493		593
494	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
495	set_hdr (type, dst);	595	set_hdr (type, dst);
496	}	596	}
497		597
498	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
499	{	600	{
500	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
501	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
502	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
503	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
504	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
505	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
506	else if (challengelen != sizeof (rsachallenge))
507	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
508	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
509	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
510	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
511	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
512	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
513	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	611	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		613	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		614	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		615	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
514	else	616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		619
		620	if (cmp > 0)
		621	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		622	conf->nodename, (const char *)rsi);
		623	else if (cmp == 0)
515	return true;	624	return true;
		625	}
516		626
517	return false;	627	return false;
518	}	628	}
519		629
520	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
521	{	631	{
522	char magic[8];	632	char magic[8];
523	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
524	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
525	u8 pad2, pad3;	635	u8 pad2, pad3;
526	rsaid id;	636	auth_encr encr;
527	rsaencrdata encr;
528		637
529	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
530	{	639	{
531	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
532	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
533	initiate = !!initiate_;	642	initiate = !!initiate_;
534	protocols = protocols_;	643	protocols = protocols_;
535		644
536	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
537	}	646	}
538	};	647	};
539		648
540	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
541	{	650	{
542	rsaid id;
543	u8 pad1, pad2, pad3;
544	u8 response_len; // encrypted length
545	rsaresponse response;	651	auth_response response;
546		652
547	auth_res_packet (int dst)	653	auth_res_packet (int dst)
548	{	654	{
549	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
550		656
551	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
552	}	658	}
553	};	659	};
554		660
…		…
584	};	690	};
585		691
586	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
587		693
588	void	694	void
589	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
590	{	696	{
591	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	697	if (!have_snd_auth || !have_rcv_auth)
		698	return;
592		699
593	if (ictx && octx)	700	si = rsi;
		701	protocol = rsi.prot;
		702
		703	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		704	conf->nodename, (const char *)rsi,
		705	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		706	PROTOCOL_MAJOR, prot_minor);
		707
		708	if (::conf.script_node_up)
		709	{
		710	run_script_cb *cb = new run_script_cb;
		711	cb->set<connection, &connection::script_node_up> (this);
		712	run_script_queued (cb, _("node-up command execution failed, continuing."));
594	{	713	}
595	connectmode = conf->connectmode;	714
		715	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		716	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
596		717
		718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
597	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
598	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
599	rekey.start (rekey_interval, rekey_interval);	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
600	keepalive.start (::conf.keepalive);	729	keepalive.start (::conf.keepalive);
601		730
602	// send queued packets	731	// send queued packets
603	if (ictx && octx)
604	{
605	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
606	{	733	{
607	send_data_packet (p);	734	if (p->len) send_data_packet (p);
608	delete p;	735	delete p;
609	}	736	}
610		737
611	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612	{	739	{
613	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
614	delete p;	741	delete p;
615	}
616	}
617	}	742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
		748	connection::reset_si ()
		749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
618	else	752	else
619	{	753	{
620	retry_cnt = 0;
621	establish_connection.start (5);
622	keepalive.stop ();
623	rekey.stop ();
624	}
625	}
626
627	void
628	connection::reset_si ()
629	{
630	protocol = best_protocol (THISNODE->protocols & conf->protocols);
631
632	// mask out protocols we cannot establish
633	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
634	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
635	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
636
637	if (protocol
638	&& (!conf->can_direct (THISNODE)
639	|| !THISNODE->can_direct (conf)))
640	{
641	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
642	protocol = 0;	755	protocol = 0;
643	}	756	}
644		757
645	si.set (conf, protocol);	758	si.set (conf, protocol);
646	}	759	}
…		…
649	const sockinfo &	762	const sockinfo &
650	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
651	{	764	{
652	if (!si.valid ())	765	if (!si.valid ())
653	{	766	{
654	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
655		768
656	if (r)	769	if (r)
657	{	770	{
658	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659	conf->nodename, r->conf->nodename, (const char *)r->si);	772	conf->nodename, r->conf->nodename);
660	return r->si;	773	return r->si;
661	}	774	}
662	else	775	else
663	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
664	conf->nodename);	777	conf->nodename);
665	}	778	}
666		779
667	return si;	780	return si;
668	}	781	}
669		782
670	void	783	void
671	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
672	{	785	{
673	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
674	reset_connection ();	787	reset_connection ("packet send error");
675	}	788	}
676		789
677	void	790	void
678	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
679	{	792	{
680	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
681		794
682	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	795	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		796
		797	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
683	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684		799
685	delete pkt;	800	delete pkt;
686	}	801	}
687		802
…		…
702	void	817	void
703	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
704	{	819	{
705	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	820	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
706		821
707	rsachallenge chg;	822	generate_auth_data ();
708	rsa_cache.gen (pkt->id, chg);
709	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
710		824
711	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	825	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
712
713	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
714		827
715	delete pkt;	828	delete pkt;
716	}	829	}
717		830
718	void	831	void
719	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
720	{	833	{
721	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
722		835
723	pkt->id = id;	836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		837	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
724		838
725	rsa_hash (id, chg, pkt->response);
726
727	pkt->hmac_set (octx);
728
729	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
730
731	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
732		841
733	delete pkt;	842	delete pkt;
734	}	843	}
735		844
736	void	845	void
737	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738	{	847	{
739	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
740	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
741		851
742	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	852	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
743		853
744	r->hmac_set (octx);	854	r->hmac_set (octx);
745	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
746		856
747	delete r;	857	delete r;
748	}	858	}
749		859
750	void	860	inline void
751	connection::establish_connection_cb (ev::timer &w, int revents)	861	connection::establish_connection_cb (ev::timer &w, int revents)
752	{	862	{
753	if (!ictx	863	if (!(ictx && octx)
754	&& conf != THISNODE	864	&& conf != THISNODE
755	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
756	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
757	&& !w.is_active ())	867	&& !w.is_active ())
758	{	868	{
		869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		870	// and stop trying. should probably be handled by a per-connection expire handler.
		871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
		874	return;
		875	}
		876
		877	last_establish_attempt = ev_now ();
		878
759	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760	? (retry_cnt & 3) + 1	880	? (retry_cnt & 3) + 1
761	: 1 << (retry_cnt >> 2));	881	: 1 << (retry_cnt >> 2));
762		882
763	reset_si ();	883	reset_si ();
764		884
765	bool slow = si.prot & PROT_SLOW;	885	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
766		886
767	if (si.prot && !si.host)	887	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
768	{	888	{
769	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770	/*TODO*/ /* start the timer so we don't recurse endlessly */	889	/*TODO*/ /* start the timer so we don't recurse endlessly */
771	w.start (1);	890	w.start (1);
772	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
773	}	892	}
774	else	893	else
775	{	894	{
776	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
777		898
778	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
779		900
780	slow = slow || (dsi.prot & PROT_SLOW);	901	slow = slow || (dsi.prot & PROT_SLOW);
781		902
782	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
783	{	904	{
784	if (retry_cnt < 4)	905	// use ping after the first few retries
		906	// TODO: on rekeys, the other node might not interpret ping correctly,
		907	// TODO: as it will still have a valid connection
		908	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
785	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
786	else	910	else
787	send_ping (dsi, 0);	911	send_ping (dsi, 0);
788	}	912	}
789	}	913	}
790		914
791	retry_int *= slow ? 8. : 0.7;	915	retry_int *= slow ? 4. : 0.9;
792		916
793	if (retry_int < conf->max_retry)	917	if (retry_int < conf->max_retry)
794	retry_cnt++;	918	retry_cnt++;
795	else	919	else
796	retry_int = conf->max_retry;	920	retry_int = conf->max_retry;
…		…
798	w.start (retry_int);	922	w.start (retry_int);
799	}	923	}
800	}	924	}
801		925
802	void	926	void
803	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
804	{	928	{
805	if (ictx && octx)	929	if (ictx && octx)
806	{	930	{
807	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
809		933
810	if (::conf.script_node_down)	934	if (::conf.script_node_down)
811	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	935	{
		936	run_script_cb *cb = new run_script_cb;
		937	cb->set<connection, &connection::script_node_down> (this);
812	slog (L_WARN, _("node-down command execution failed, continuing."));	938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
813	}	940	}
814		941
815	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
816	delete octx; octx = 0;	943	delete octx; octx = 0;
817	#if ENABLE_DNS
818	dnsv4_reset_connection ();
819	#endif
820		944
821	si.host = 0;	945	si.host = 0;
822		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
823	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
824	retry_cnt = 0;	953	retry_cnt = 0;
825		954
826	rekey.stop ();	955	rekey.stop ();
827	keepalive.stop ();	956	keepalive.stop ();
828	establish_connection.stop ();	957	establish_connection.stop ();
…		…
832	connection::shutdown ()	961	connection::shutdown ()
833	{	962	{
834	if (ictx && octx)	963	if (ictx && octx)
835	send_reset (si);	964	send_reset (si);
836		965
837	reset_connection ();	966	reset_connection ("shutdown");
838	}	967	}
839		968
840	void	969	// poor-man's rekeying
		970	inline void
841	connection::rekey_cb (ev::timer &w, int revents)	971	connection::rekey_cb (ev::timer &w, int revents)
842	{	972	{
843	reset_connection ();	973	reset_connection ("rekeying");
844	establish_connection ();	974	establish_connection ();
845	}	975	}
846		976
847	void	977	void
848	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
862	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
863	rekey ();	993	rekey ();
864	}	994	}
865		995
866	void	996	void
		997	connection::post_inject_queue ()
		998	{
		999	// force a connection every now and when when packets are sent (max 1/s)
		1000	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1001	establish_connection.stop ();
		1002
		1003	establish_connection ();
		1004	}
		1005
		1006	void
867	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
868	{	1008	{
869	if (ictx && octx)	1009	if (ictx && octx)
870	send_data_packet (pkt);	1010	send_data_packet (pkt);
871	else	1011	else
872	{	1012	{
873	if (!broadcast)
874	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
875		1014	post_inject_queue ();
876	establish_connection ();
877	}	1015	}
878	}	1016	}
879		1017
		1018	void
880	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
881	{	1020	{
882	if (ictx && octx)	1021	if (ictx && octx)
883	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
884	else	1023	else
885	{	1024	{
886	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
887		1026	post_inject_queue ();
888	establish_connection ();
889	}	1027	}
890	}	1028	}
891		1029
892	void	1030	void
893	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
894	{	1032	{
895	last_activity = ev_now ();	1033	last_activity = ev_now ();
896		1034
897	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1035	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
898	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1036	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
899		1037
900	if (connectmode == conf_node::C_DISABLED)	1038	if (connectmode == conf_node::C_DISABLED)
901	return;	1039	return;
902		1040
903	switch (pkt->typ ())	1041	switch (pkt->typ ())
904	{	1042	{
905	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
906	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
907	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
908	// when we receive a ping.	1048	// when we receive a ping.
909	if (!ictx)	1049	if (!ictx)
910	{	1050	{
911	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
912	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
913	}	1053	}
914	else	1054	else
		1055	// we would love to change the socket address here, but ping's aren't
		1056	// authenticated, so we best ignore it.
915	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
916		1058
917	break;	1059	break;
918		1060
919	case vpn_packet::PT_PONG:	1061	case vpn_packet::PT_PONG:
		1062	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1063
		1064	// a PONG might mean that the other side doesn't really know
		1065	// about our desire for communication.
		1066	establish_connection ();
920	break;	1067	break;
921		1068
922	case vpn_packet::PT_RESET:	1069	case vpn_packet::PT_RESET:
		1070	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1071
		1072	if (ictx && octx)
923	{	1073	{
924	reset_connection ();	1074	reset_connection ("remote reset");
925		1075
926	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
927		1077
928	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
929	{
930	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
931	conf->nodename, (const char *)rsi);
932	connectmode = conf_node::C_DISABLED;
933	}
934	else if (connectmode == conf_node::C_ALWAYS)
935	establish_connection ();	1079	establish_connection ();
936	}	1080	}
		1081
937	break;	1082	break;
938		1083
939	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
940	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
941	{	1086	{
942	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
943		1088
944	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1089	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1090	conf->nodename, p->initiate ? "initiate" : "reply",
		1091	p->protocols, p->features);
945		1092
946	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1093	if (memcmp (p->magic, MAGIC, 8))
		1094	{
		1095	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1096	conf->nodename, (const char *)rsi);
		1097	}
		1098	else if (p->chk_config (conf, rsi))
947	{	1099	{
948	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
949	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1101	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
950	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
951	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
952		1104
953	if (p->initiate)	1105	if (p->initiate)
		1106	{
954	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
955		1108
956	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
957		1112
		1113	auth_data auth;
		1114
958	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
959	{	1116	{
960	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
961	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
962	break;
963	}	1119	}
964	else	1120	else
965	{	1121	{
966	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
967		1123
968	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
969	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
970		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
971	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
972	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
973		1133
974	send_auth_response (rsi, p->id, k);
975
976	connection_established ();	1134	connection_established (rsi);
977
978	break;	1135	}
979	}	1136	}
		1137
		1138	break;
980	}	1139	}
981	else
982	slog (L_WARN, _("%s(%s): protocol mismatch"),
983	conf->nodename, (const char *)rsi);
984		1140
985	send_reset (rsi);	1141	send_reset (rsi);
986	}	1142	}
987		1143
988	break;	1144	break;
989		1145
990	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
991	{	1147	{
992	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
993		1149
994	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
995		1151
996	if (p->chk_config ())	1152	auth_mac local_mac;
		1153	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1154
		1155	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
997	{	1156	{
998	if (p->prot_minor != PROTOCOL_MINOR)
999	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1000	conf->nodename, (const char *)rsi,
1001	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1002
1003	rsachallenge chg;
1004
1005	if (!rsa_cache.find (p->id, chg))
1006	{
1007	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1008	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
1009	break;
1010	}	1159	}
1011	else	1160	else if (!have_snd_auth)
1012	{	1161	{
1013	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1014		1163
1015	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
1016	{
1017	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1018	"could be an attack, or just corruption or a synchronization error"),
1019	conf->nodename, (const char *)rsi);
1020	break;
1021	}
1022	else
1023	{
1024	rsaresponse h;
1025
1026	rsa_hash (p->id, chg, h);
1027
1028	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1029	{
1030	prot_minor = p->prot_minor;
1031
1032	delete ictx; ictx = cctx;
1033
1034	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1035
1036	si = rsi;
1037	protocol = rsi.prot;
1038
1039	connection_established ();	1165	connection_established (rsi);
1040
1041	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1042	conf->nodename, (const char *)rsi,
1043	p->prot_major, p->prot_minor);
1044
1045	if (::conf.script_node_up)
1046	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1047	slog (L_WARN, _("node-up command execution failed, continuing."));
1048
1049	break;
1050	}
1051	else
1052	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1053	conf->nodename, (const char *)rsi);
1054	}
1055
1056	delete cctx;
1057	}
1058	}	1166	}
1059	}	1167	}
1060
1061	send_reset (rsi);
1062	break;	1168	break;
1063		1169
1064	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1065	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1066	send_reset (rsi);	1172	send_reset (rsi);
…		…
1072	if (ictx && octx)	1178	if (ictx && octx)
1073	{	1179	{
1074	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1075		1181
1076	if (!p->hmac_chk (ictx))	1182	if (!p->hmac_chk (ictx))
		1183	{
		1184	// rekeying often creates temporary hmac auth floods
		1185	// we assume they don't take longer than a few seconds normally,
		1186	// and suppress messages and resets during that time.
		1187	//TODO: should be done per source address
		1188	if (!hmac_error)
		1189	{
		1190	hmac_error = ev_now () + 3;
		1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
		1195	else
		1196	{
1077	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1078	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1079	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1080	else	1203	else
1081	{	1204	{
1082	u32 seqno;	1205	u32 seqno;
1083	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1084		1208
1085	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1086	{	1212	{
1087	vpn->tap->send (d);	1213	vpn->tap->send (d);
1088		1214
1089	if (si != rsi)	1215	if (si != rsi)
1090	{	1216	{
1091	// fast re-sync on source address changes, useful especially for tcp/ip	1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
1092	si = rsi;	1219	// {
1093
1094	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1095	conf->nodename, (const char *)si, (const char *)rsi);	1221	conf->nodename, (const char *)si, (const char *)rsi);
		1222
		1223	si = rsi;
		1224
		1225	if (::conf.script_node_change)
		1226	{
		1227	run_script_cb *cb = new run_script_cb;
		1228	cb->set<connection, &connection::script_node_change> (this);
		1229	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1230	}
		1231
		1232	// }
		1233	//else
		1234	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1235	// conf->nodename, (const char *)si, (const char *)rsi);
1096	}	1236	}
		1237	}
		1238	else if (seqclass == 1) // far history
		1239	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1240	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1241	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1242	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1243	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1244	else if (seqclass == 3) // reset
		1245	{
		1246	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1247	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1248	send_reset (rsi);
1097	}	1249	}
1098		1250
1099	delete d;	1251	delete d;
1100	break;	1252	break;
1101	}	1253	}
…		…
1105	break;	1257	break;
1106		1258
1107	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1108	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1109	{	1261	{
1110	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1111		1263
1112	if (p->id > 0 && p->id <= vpn->conns.size ())	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1113	{	1265	{
1114	connection *c = vpn->conns[p->id - 1];	1266	connection *c = vpn->conns[p->id - 1];
1115	conf->protocols = p->protocols;	1267	conf->protocols = p->protocols;
1116		1268
1117	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1269	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1270	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1271	p->protocols,
1118	conf->id, p->id, c->ictx && c->octx);	1272	c->ictx && c->octx);
1119		1273
1120	if (c->ictx && c->octx)	1274	if (c->ictx && c->octx)
1121	{	1275	{
1122	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1123	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
…		…
1146		1300
1147	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1148	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1149	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1150		1304
1151	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1152	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1306	conf->nodename,
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si,
		1309	p->protocols,
		1310	protocol,
		1311	p->si.supported_protocols (c->conf),
		1312	!c->ictx && !c->octx);
1153		1313
1154	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1155		1315
1156	if (dsi.valid ())	1316	if (dsi.valid ())
1157	c->send_auth_request (dsi, true);	1317	c->send_auth_request (dsi, true);
		1318	else
		1319	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si);
1158	}	1322	}
1159	else	1323	else
1160	slog (L_WARN,	1324	slog (L_WARN,
1161	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1162	p->id);	1326	p->id);
…		…
1168	send_reset (rsi);	1332	send_reset (rsi);
1169	break;	1333	break;
1170	}	1334	}
1171	}	1335	}
1172		1336
		1337	inline void
1173	void connection::keepalive_cb (ev::timer &w, int revents)	1338	connection::keepalive_cb (ev::timer &w, int revents)
1174	{	1339	{
1175	if (ev_now () >= last_activity + ::conf.keepalive + 30)	1340	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1341
		1342	if (when >= 0)
		1343	w.start (when);
		1344	else if (when < -15)
1176	{	1345	{
1177	reset_connection ();	1346	reset_connection ("keepalive overdue");
1178	establish_connection ();	1347	establish_connection ();
1179	}	1348	}
1180	else if (ev_now () < last_activity + ::conf.keepalive)
1181	w.start (last_activity + ::conf.keepalive - ev::now ());
1182	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1183	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1184	{	1351	{
		1352	w.start (3);
1185	send_ping (si);	1353	send_ping (si);
1186	w.start (5);
1187	}	1354	}
1188	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1189	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1190	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1191	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1358	w.start (when + 10);
1192	else	1359	else
1193	reset_connection ();	1360	reset_connection ("keepalive timeout");
1194	}	1361	}
1195		1362
		1363	void
1196	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1197	{	1365	{
1198	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1366	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1199		1367
1200	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1368	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1369	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1370	THISNODE->protocols);
1201	p->hmac_set (octx);	1371	p->hmac_set (octx);
1202	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1203		1373
1204	delete p;	1374	delete p;
1205	}	1375	}
1206		1376
		1377	void
1207	void connection::script_init_env (const char *ext)	1378	connection::script_init_env (const char *ext)
1208	{	1379	{
1209	char *env;	1380	char *env;
1210	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1211	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1212	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1213	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1214	conf->id & 0xff); putenv (env);	1385	conf->id & 0xff); putenv (env);
1215	}	1386	}
1216		1387
		1388	void
1217	void connection::script_init_connect_env ()	1389	connection::script_init_connect_env ()
1218	{	1390	{
1219	vpn->script_init_env ();	1391	vpn->script_init_env ();
1220		1392
1221	char *env;	1393	char *env;
1222	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1394	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1395	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1223	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1224	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1225	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1226	}	1399	}
1227		1400
		1401	inline const char *
1228	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1229	{	1403	{
1230	script_init_connect_env ();	1404	script_init_connect_env ();
1231		1405
1232	putenv ((char *)"STATE=up");	1406	putenv ((char *)"STATE=up");
1233		1407
…		…
1238	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1239		1413
1240	return filename;	1414	return filename;
1241	}	1415	}
1242		1416
		1417	inline const char *
		1418	connection::script_node_change ()
		1419	{
		1420	script_init_connect_env ();
		1421
		1422	putenv ((char *)"STATE=change");
		1423
		1424	char *filename;
		1425	asprintf (&filename,
		1426	"%s/%s",
		1427	confbase,
		1428	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1429
		1430	return filename;
		1431	}
		1432
		1433	inline const char *
1243	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1244	{	1435	{
1245	script_init_connect_env ();	1436	script_init_connect_env ();
1246		1437
1247	putenv ((char *)"STATE=down");	1438	putenv ((char *)"STATE=down");
1248		1439
…		…
1254		1445
1255	return filename;	1446	return filename;
1256	}	1447	}
1257		1448
1258	connection::connection (struct vpn *vpn, conf_node *conf)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1259	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1260	, rekey (this, &connection::rekey_cb)
1261	, keepalive (this, &connection::keepalive_cb)
1262	, establish_connection (this, &connection::establish_connection_cb)
1263	#if ENABLE_DNS	1451	#if ENABLE_DNS
1264	, dns (0)	1452	dns (0),
1265	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1266	{	1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
		1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1460
		1461	last_establish_attempt = 0.;
1267	octx = ictx = 0;	1462	octx = ictx = 0;
1268	retry_cnt = 0;
1269		1463
1270	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1271	conf->protocols = PROT_UDPv4;
1272		1465
1273	connectmode = conf_node::C_ALWAYS; // initial setting	1466	// queue a dummy packet to force an initial connection attempt
		1467	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1468	vpn_queue.put (new net_packet);
		1469
1274	reset_connection ();	1470	reset_connection ("startup");
1275	}	1471	}
1276		1472
1277	connection::~connection ()	1473	connection::~connection ()
1278	{	1474	{
1279	shutdown ();	1475	shutdown ();
1280	}	1476	}
1281		1477
		1478	void
1282	void connection_init ()	1479	connection_init ()
1283	{	1480	{
1284	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1285	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1286	}	1483	}
1287		1484

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