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Comparing gvpe/src/connection.C (file contents):
Revision 1.67 by pcg, Thu Aug 7 16:34:21 2008 UTC vs.
Revision 1.114 by root, Thu Jun 30 11:43:38 2016 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) 2003-2008,2010,2011,2013,2016 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>
30		43
31	#include "conf.h"	44	#include "conf.h"
32	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
33	#include "device.h"	47	#include "device.h"
34	#include "vpn.h"	48	#include "vpn.h"
35	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
36		51
37	#include "netcompat.h"	52	#include "netcompat.h"
38		53
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	54	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		55
45	#define ULTRA_FAST 1	56	#define ULTRA_FAST 1
46	#define HLOG 15	57	#define HLOG 15
47	#include "lzf/lzf.h"	58	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	59	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	60	#include "lzf/lzf_d.c"
50		61
		62	//////////////////////////////////////////////////////////////////////////////
		63
		64	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		65	static ev::child rs_child_ev;
		66
		67	namespace
		68	{
		69	void // c++ requires external linkage here, apparently :(
		70	rs_child_cb (ev::child &w, int revents)
		71	{
		72	w.stop ();
		73
		74	if (rs_queue.empty ())
		75	return;
		76
		77	pid_t pid = run_script (*rs_queue.front ().first, false);
		78	if (pid)
		79	{
		80	w.set (pid);
		81	w.start ();
		82	}
		83	else
		84	slog (L_WARN, rs_queue.front ().second);
		85
		86	delete rs_queue.front ().first;
		87	rs_queue.pop ();
		88	}
		89	};
		90
		91	// despite the fancy name, this is quite a hack
		92	static void
		93	run_script_queued (run_script_cb *cb, const char *warnmsg)
		94	{
		95	rs_queue.push (std::make_pair (cb, warnmsg));
		96
		97	if (!rs_child_ev.is_active ())
		98	{
		99	rs_child_ev.set<rs_child_cb> ();
		100	rs_child_ev ();
		101	}
		102	}
		103
		104	//////////////////////////////////////////////////////////////////////////////
		105
51	struct crypto_ctx	106	struct crypto_ctx
52	{	107	{
53	EVP_CIPHER_CTX cctx;	108	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	109	hmac hctx;
55		110
56	crypto_ctx (const rsachallenge &challenge, int enc);	111	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	112	~crypto_ctx ();
58	};	113	};
59		114
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	115	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	116	{
		117	ecdh_key s;
		118
		119	curve25519_combine (a, b, s);
		120
		121	{
		122	u8 mac_key[MAC_KEYSIZE];
		123	static const unsigned char mac_info[] = "gvpe mac key";
		124
		125	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		126	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		127	kdf.extract (s, sizeof (s));
		128	kdf.extract_done (HKDF_PRF_HASH ());
		129	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		130
		131	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		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
62	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
63	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));
64	HMAC_CTX_init (&hctx);	146	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	147	}
67		148
68	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
69	{	150	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	152	}
		153
		154	static inline void
		155	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		156	{
		157	if (RSA_public_encrypt (sizeof (auth.rsa),
		158	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		159	key, RSA_PKCS1_OAEP_PADDING) < 0)
		160	fatal ("RSA_public_encrypt error");
		161
		162	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		163	}
		164
		165	static inline bool
		166	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		167	{
		168	u8 rsa_decrypt[RSA_KEYLEN];
		169
		170	if (RSA_private_decrypt (sizeof (encr.rsa),
		171	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		172	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		173	return 0;
		174
		175	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		176	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		177
		178	return 1;
72	}	179	}
73		180
74	static void	181	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	182	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	183	{
77	EVP_MD_CTX ctx;	184	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		185	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	186	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	187	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	}	188	}
86		189
87	struct rsa_entry	190	void
		191	connection::generate_auth_data ()
88	{	192	{
89	tstamp expire;	193	if (auth_expire < ev_now ())
90	rsaid id;
91	rsachallenge chg;
92	};
93
94	struct rsa_cache : list<rsa_entry>
95	{
96	inline 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	{	194	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	195	// request data
103	{	196	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	197	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
105		198
106	erase (i);	199	// eventual response data
107	return true;	200	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	201	}
110		202
111	if (!cleaner.is_active ())	203	// 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;	204	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	{
136	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
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	}	205	}
155		206
156	//////////////////////////////////////////////////////////////////////////////	207	//////////////////////////////////////////////////////////////////////////////
157		208
158	pkt_queue::pkt_queue (double max_ttl, int max_queue)	209	pkt_queue::pkt_queue (double max_ttl, int max_queue)
…		…
172	delete p;	223	delete p;
173		224
174	delete [] queue;	225	delete [] queue;
175	}	226	}
176		227
		228	void
177	void pkt_queue::expire_cb (ev::timer &w, int revents)	229	pkt_queue::expire_cb (ev::timer &w, int revents)
178	{	230	{
179	ev_tstamp expire = ev_now () - max_ttl;	231	ev_tstamp expire = ev_now () - max_ttl;
180		232
181	for (;;)	233	for (;;)
182	{	234	{
…		…
193		245
194	delete get ();	246	delete get ();
195	}	247	}
196	}	248	}
197		249
		250	void
198	void pkt_queue::put (net_packet *p)	251	pkt_queue::put (net_packet *p)
199	{	252	{
200	ev_tstamp now = ev_now ();	253	ev_tstamp now = ev_now ();
201		254
202	// start expiry timer	255	// start expiry timer
203	if (empty ())	256	if (empty ())
…		…
212	queue[i].tstamp = now;	265	queue[i].tstamp = now;
213		266
214	i = ni;	267	i = ni;
215	}	268	}
216		269
217	net_packet *pkt_queue::get ()	270	net_packet *
		271	pkt_queue::get ()
218	{	272	{
219	if (empty ())	273	if (empty ())
220	return 0;	274	return 0;
221		275
222	net_packet *p = queue[j].pkt;	276	net_packet *p = queue[j].pkt;
…		…
246		300
247	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
248	bool can (u32 host);	302	bool can (u32 host);
249	};	303	};
250		304
251	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	305	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
252		306
		307	bool
253	bool net_rate_limiter::can (u32 host)	308	net_rate_limiter::can (u32 host)
254	{	309	{
255	iterator i;	310	iterator i;
256		311
257	for (i = begin (); i != end (); )	312	for (i = begin (); i != end (); )
258	if (i->host == host)	313	if (i->host == host)
…		…
303	}	358	}
304	}	359	}
305		360
306	/////////////////////////////////////////////////////////////////////////////	361	/////////////////////////////////////////////////////////////////////////////
307		362
308	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	363	void
309
310	void hmac_packet::hmac_gen (crypto_ctx *ctx)	364	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
311	{	365	{
312	unsigned int xlen;	366	ctx->hctx.init ();
313		367	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
314	HMAC_CTX *hctx = &ctx->hctx;	368	ctx->hctx.digest (hmac_digest);
315
316	HMAC_Init_ex (hctx, 0, 0, 0, 0);
317	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
318	len - sizeof (hmac_packet));
319	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
320	}	369	}
321		370
322	void	371	void
323	hmac_packet::hmac_set (crypto_ctx *ctx)	372	hmac_packet::hmac_set (crypto_ctx *ctx)
324	{	373	{
325	hmac_gen (ctx);	374	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
326		375	hmac_gen (ctx, hmac_digest);
327	memcpy (hmac, hmac_digest, HMACLENGTH);	376	memcpy (hmac, hmac_digest, HMACLENGTH);
328	}	377	}
329		378
330	bool	379	bool
331	hmac_packet::hmac_chk (crypto_ctx *ctx)	380	hmac_packet::hmac_chk (crypto_ctx *ctx)
332	{	381	{
333	hmac_gen (ctx);	382	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
334		383	hmac_gen (ctx, hmac_digest);
335	return !memcmp (hmac, hmac_digest, HMACLENGTH);	384	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
336	}	385	}
337		386
		387	void
338	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	388	vpn_packet::set_hdr (ptype type_, unsigned int dst)
339	{	389	{
340	type = type_;	390	type = type_;
341		391
342	int src = THISNODE->id;	392	int src = THISNODE->id;
343		393
…		…
345	srcdst = ((src >> 8) << 4) | (dst >> 8);	395	srcdst = ((src >> 8) << 4) | (dst >> 8);
346	dst1 = dst;	396	dst1 = dst;
347	}	397	}
348		398
349	#define MAXVPNDATA (MAX_MTU - 6 - 6)	399	#define MAXVPNDATA (MAX_MTU - 6 - 6)
350	#define DATAHDR (sizeof (u32) + RAND_SIZE)
351		400
352	struct vpndata_packet : vpn_packet	401	struct vpndata_packet : vpn_packet
		402	{
		403	u32 ctr; // seqno
		404	u8 data[MAXVPNDATA];
		405
		406	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		407	tap_packet *unpack (connection *conn, u32 &seqno);
		408
		409	private:
		410	const u32 data_hdr_size () const
353	{	411	{
354	u8 data[MAXVPNDATA + DATAHDR]; // seqno	412	// the distance from beginning of packet to data member
355		413	return data - at (0);
356	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
357	tap_packet *unpack (connection *conn, u32 &seqno);
358	private:
359
360	const u32 data_hdr_size () const
361	{
362	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
363	}
364	};	414	}
		415	};
		416
		417	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		418	static unsigned char *
		419	expand_iv (u32 ctr)
		420	{
		421	static u32 iv[IV_SIZE (CIPHER) / 4];
		422
		423	require (sizeof (iv) == 4 * 4);
		424	require (IV_SIZE (CIPHER) % 4 == 0);
		425
		426	iv[0] =
		427	iv[1] =
		428	iv[2] = ctr;
		429
		430	// I would reuse ctr here to to avoid potential endianness issues,
		431	// but it seems openssl wraps around. While this would be still ok,
		432	// and I don't even know if its true, let's play safe and initialise
		433	// to 0.
		434	iv[3] = 0;
		435
		436	return (unsigned char *)iv;
		437	}
365		438
366	void	439	void
367	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	440	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
368	{	441	{
369	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	442	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
371	ptype type = PT_DATA_UNCOMPRESSED;	444	ptype type = PT_DATA_UNCOMPRESSED;
372		445
373	#if ENABLE_COMPRESSION	446	#if ENABLE_COMPRESSION
374	u8 cdata[MAX_MTU];	447	u8 cdata[MAX_MTU];
375		448
376	if (conn->features & ENABLE_COMPRESSION)	449	if (conn->features & FEATURE_COMPRESSION)
377	{	450	{
378	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	451	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
379		452
380	if (cl)	453	if (cl)
381	{	454	{
…		…
387	d[1] = cl;	460	d[1] = cl;
388	}	461	}
389	}	462	}
390	#endif	463	#endif
391		464
		465	ctr = htonl (seqno);
		466
392	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	467	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
393
394	struct {
395	#if RAND_SIZE
396	u8 rnd[RAND_SIZE];
397	#endif
398	u32 seqno;
399	} datahdr;
400
401	datahdr.seqno = ntohl (seqno);
402	#if RAND_SIZE
403	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
404	#endif
405		468
406	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
407	(unsigned char *) data + outl, &outl2,	470	(unsigned char *)data + outl, &outl2,
408	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *)d, l));
409	outl += outl2;	472	outl += outl2;
410		473
411	require (EVP_EncryptUpdate (cctx,	474	// it seems this is a nop for us, but we do it anyways
412	(unsigned char *) data + outl, &outl2,	475	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
413	(unsigned char *) d, l));
414	outl += outl2;	476	outl += outl2;
415		477
416	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
417	outl += outl2;
418
419	len = outl + data_hdr_size ();	478	len = data_hdr_size () + outl;
420		479
421	set_hdr (type, dst);	480	set_hdr (type, dst);
422		481
423	hmac_set (conn->octx);	482	hmac_set (conn->octx);
424	}	483	}
…		…
428	{	487	{
429	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	488	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
430	int outl = 0, outl2;	489	int outl = 0, outl2;
431	tap_packet *p = new tap_packet;	490	tap_packet *p = new tap_packet;
432	u8 *d;	491	u8 *d;
433	u32 l = len - data_hdr_size ();
434		492
		493	seqno = ntohl (ctr);
		494
435	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	495	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
436		496
437	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
438	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
439		499
440	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
441	d = cdata;	501	d = cdata;
442	else	502	else
443	#endif	503	#endif
444	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6];
445		505
446	/* this overwrites part of the src mac, but we fix that later */	506	// this can overwrite the len/dst/src fields
447	require (EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
448	d, &outl2,	508	d, &outl2,
449	(unsigned char *)&data, len - data_hdr_size ()));	509	(unsigned char *)&data, len - data_hdr_size ()));
450	outl += outl2;	510	outl += outl2;
451		511
		512	// it seems this is a nop for us, but we do it anyways
452	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
453	outl += outl2;	514	outl += outl2;
454		515
455	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
456
457	id2mac (dst () ? dst() : THISNODE->id, p->dst);	516	id2mac (dst () ? dst() : THISNODE->id, p->dst);
458	id2mac (src (), p->src);	517	id2mac (src (), p->src);
459		518
460	#if ENABLE_COMPRESSION	519	#if ENABLE_COMPRESSION
461	if (type == PT_DATA_COMPRESSED)	520	if (type == PT_DATA_COMPRESSED)
462	{	521	{
463	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	522	u32 cl = (d[0] << 8) | d[1];
464		523
465	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	524	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
466	&(*p)[6 + 6], MAX_MTU)	525	&(*p)[6 + 6], MAX_MTU)
467	+ 6 + 6;	526	+ 6 + 6;
468	}	527	}
469	else	528	else
470	p->len = outl + (6 + 6 - DATAHDR);	529	p->len = outl + (6 + 6);
471	#endif	530	#endif
472		531
473	return p;	532	return p;
474	}	533	}
475		534
…		…
482	}	541	}
483	};	542	};
484		543
485	struct config_packet : vpn_packet	544	struct config_packet : vpn_packet
486	{	545	{
487	// actually, hmaclen cannot be checked because the hmac	546	u8 serial[SERIAL_SIZE];
488	// field comes before this data, so peers with other
489	// hmacs simply will not work.
490	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
491	u8 flags, challengelen, features, pad3;	548	u8 flags, features, pad6, pad7, pad8;
492	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
493		550
494	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
495	bool chk_config () const;	552	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
496		553
497	static u8 get_features ()	554	static u8 get_features ()
498	{	555	{
499	u8 f = 0;	556	u8 f = 0;
500	#if ENABLE_COMPRESSION	557	#if ENABLE_COMPRESSION
…		…
508	#endif	565	#endif
509	return f;	566	return f;
510	}	567	}
511	};	568	};
512		569
		570	void
513	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
514	{	572	{
515	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
516	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
517	randsize = RAND_SIZE;
518	hmaclen = HMACLENGTH;
519	flags = 0;	575	flags = 0;
520	challengelen = sizeof (rsachallenge);
521	features = get_features ();	576	features = get_features ();
522		577
		578	strncpy ((char *)serial, conf.serial, sizeof (serial));
		579
523	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	580	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
524	digest_nid = htonl (EVP_MD_type (RSA_HASH));
525	hmac_nid = htonl (EVP_MD_type (DIGEST));	581	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		582	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
526		583
527	len = sizeof (*this) - sizeof (net_packet);	584	len = sizeof (*this) - sizeof (net_packet);
528	set_hdr (type, dst);	585	set_hdr (type, dst);
529	}	586	}
530		587
531	bool config_packet::chk_config () const	588	bool
		589	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
532	{	590	{
533	if (prot_major != PROTOCOL_MAJOR)	591	if (prot_major != PROTOCOL_MAJOR)
534	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	592	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
535	else if (randsize != RAND_SIZE)	593	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
536	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
537	else if (hmaclen != HMACLENGTH)
538	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
539	else if (challengelen != sizeof (rsachallenge))
540	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
541	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
542	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	595	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
543	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	596	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
544	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
545	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	597	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
546	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	598	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		599	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		600	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		601	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		602	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
547	else	603	else
		604	{
		605	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		606
		607	if (cmp > 0)
		608	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		609	conf->nodename, (const char *)rsi);
		610	else if (cmp == 0)
548	return true;	611	return true;
		612	}
549		613
550	return false;	614	return false;
551	}	615	}
552		616
553	struct auth_req_packet : config_packet	617	struct auth_req_packet : config_packet // UNPROTECTED
554	{	618	{
555	char magic[8];	619	char magic[8];
556	u8 initiate; // false if this is just an automatic reply	620	u8 initiate; // false if this is just an automatic reply
557	u8 protocols; // supported protocols (will be patched on forward)	621	u8 protocols; // supported protocols (will be patched on forward)
558	u8 pad2, pad3;	622	u8 pad2, pad3;
559	rsaid id;	623	auth_encr encr;
560	rsaencrdata encr;
561		624
562	auth_req_packet (int dst, bool initiate_, u8 protocols_)	625	auth_req_packet (int dst, bool initiate_, u8 protocols_)
563	{	626	{
564	config_packet::setup (PT_AUTH_REQ, dst);	627	config_packet::setup (PT_AUTH_REQ, dst);
565	strncpy (magic, MAGIC, 8);	628	memcpy (magic, MAGIC, 8);
566	initiate = !!initiate_;	629	initiate = !!initiate_;
567	protocols = protocols_;	630	protocols = protocols_;
568		631
569	len = sizeof (*this) - sizeof (net_packet);	632	len = sizeof (*this) - sizeof (net_packet);
570	}	633	}
571	};	634	};
572		635
573	struct auth_res_packet : config_packet	636	struct auth_res_packet : vpn_packet // UNPROTECTED
574	{	637	{
575	rsaid id;
576	u8 pad1, pad2, pad3;
577	u8 response_len; // encrypted length
578	rsaresponse response;	638	auth_response response;
579		639
580	auth_res_packet (int dst)	640	auth_res_packet (int dst)
581	{	641	{
582	config_packet::setup (PT_AUTH_RES, dst);	642	set_hdr (PT_AUTH_RES, dst);
583		643
584	len = sizeof (*this) - sizeof (net_packet);	644	len = sizeof (*this) - sizeof (net_packet);
585	}	645	}
586	};	646	};
587		647
…		…
617	};	677	};
618		678
619	/////////////////////////////////////////////////////////////////////////////	679	/////////////////////////////////////////////////////////////////////////////
620		680
621	void	681	void
622	connection::connection_established ()	682	connection::connection_established (const sockinfo &rsi)
623	{	683	{
624	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	684	if (!have_snd_auth || !have_rcv_auth)
		685	return;
625		686
626	if (ictx && octx)	687	si = rsi;
		688	protocol = rsi.prot;
		689
		690	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		691	conf->nodename, (const char *)rsi,
		692	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		693	PROTOCOL_MAJOR, prot_minor);
		694
		695	if (::conf.script_node_up)
		696	{
		697	run_script_cb *cb = new run_script_cb;
		698	cb->set<connection, &connection::script_node_up> (this);
		699	run_script_queued (cb, _("node-up command execution failed, continuing."));
627	{	700	}
		701
		702	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		703	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		704
		705	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		706	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		707
628	// make sure rekeying timeouts are slightly asymmetric	708	// make sure rekeying timeouts are slightly asymmetric
629	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	709	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
630	rekey.start (rekey_interval, rekey_interval);	710	rekey.start (rekey_interval, rekey_interval);
		711
		712	hmac_error = 0.;
		713
631	keepalive.start (::conf.keepalive);	714	keepalive.start (::conf.keepalive);
632		715
633	// send queued packets	716	// send queued packets
634	if (ictx && octx)
635	{
636	while (tap_packet *p = (tap_packet *)data_queue.get ())	717	while (tap_packet *p = (tap_packet *)data_queue.get ())
637	{	718	{
638	if (p->len) send_data_packet (p);	719	if (p->len) send_data_packet (p);
639	delete p;	720	delete p;
640	}	721	}
641		722
642	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	723	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
643	{	724	{
644	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);	725	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
645	delete p;	726	delete p;
646	}
647	}
648	}	727	}
		728
		729	vpn->connection_established (this);
		730	}
		731
		732	void
		733	connection::reset_si ()
		734	{
		735	if (vpn->can_direct (THISNODE, conf))
		736	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
649	else	737	else
650	{	738	{
651	retry_cnt = 0;
652	establish_connection.start (5);
653	keepalive.stop ();
654	rekey.stop ();
655	}
656	}
657
658	void
659	connection::reset_si ()
660	{
661	protocol = best_protocol (THISNODE->protocols & conf->protocols);
662
663	// mask out protocols we cannot establish
664	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
665	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
666	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
667
668	if (protocol
669	&& (!conf->can_direct (THISNODE)
670	|| !THISNODE->can_direct (conf)))
671	{
672	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	739	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
673	protocol = 0;	740	protocol = 0;
674	}	741	}
675		742
676	si.set (conf, protocol);	743	si.set (conf, protocol);
677	}	744	}
…		…
680	const sockinfo &	747	const sockinfo &
681	connection::forward_si (const sockinfo &si) const	748	connection::forward_si (const sockinfo &si) const
682	{	749	{
683	if (!si.valid ())	750	if (!si.valid ())
684	{	751	{
685	connection *r = vpn->find_router ();	752	connection *r = vpn->find_router_for (this);
686		753
687	if (r)	754	if (r)
688	{	755	{
689	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	756	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
690	conf->nodename, r->conf->nodename, (const char *)r->si);	757	conf->nodename, r->conf->nodename);
691	return r->si;	758	return r->si;
692	}	759	}
693	else	760	else
694	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	761	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
695	conf->nodename);	762	conf->nodename);
696	}	763	}
697		764
698	return si;	765	return si;
699	}	766	}
700		767
701	void	768	void
702	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	769	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
703	{	770	{
704	if (!vpn->send_vpn_packet (pkt, si, tos))	771	if (!vpn->send_vpn_packet (pkt, si, tos))
705	reset_connection ();	772	reset_connection ("packet send error");
706	}	773	}
707		774
708	void	775	void
709	connection::send_ping (const sockinfo &si, u8 pong)	776	connection::send_ping (const sockinfo &si, u8 pong)
710	{	777	{
711	ping_packet *pkt = new ping_packet;	778	ping_packet *pkt = new ping_packet;
712		779
713	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	780	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		781
		782	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
714	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	783	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
715		784
716	delete pkt;	785	delete pkt;
717	}	786	}
718		787
…		…
733	void	802	void
734	connection::send_auth_request (const sockinfo &si, bool initiate)	803	connection::send_auth_request (const sockinfo &si, bool initiate)
735	{	804	{
736	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	805	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
737		806
738	rsachallenge chg;	807	generate_auth_data ();
739	rsa_cache.gen (pkt->id, chg);
740	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	808	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
741		809
742	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	810	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
743
744	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	811	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
745		812
746	delete pkt;	813	delete pkt;
747	}	814	}
748		815
749	void	816	void
750	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	817	connection::send_auth_response (const sockinfo &si)
751	{	818	{
752	auth_res_packet *pkt = new auth_res_packet (conf->id);	819	auth_res_packet *pkt = new auth_res_packet (conf->id);
753		820
754	pkt->id = id;	821	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		822	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
755		823
756	rsa_hash (id, chg, pkt->response);
757
758	pkt->hmac_set (octx);
759
760	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	824	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
761
762	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
763		826
764	delete pkt;	827	delete pkt;
765	}	828	}
766		829
767	void	830	void
768	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	831	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
769	{	832	{
770	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	833	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
771	conf->id, rid, (const char *)rsi);	834	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		835	conf->protocols);
772		836
773	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	837	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
774		838
775	r->hmac_set (octx);	839	r->hmac_set (octx);
776	send_vpn_packet (r, si);	840	send_vpn_packet (r, si);
…		…
779	}	843	}
780		844
781	inline void	845	inline void
782	connection::establish_connection_cb (ev::timer &w, int revents)	846	connection::establish_connection_cb (ev::timer &w, int revents)
783	{	847	{
784	if (!ictx	848	if (!(ictx && octx)
785	&& conf != THISNODE	849	&& conf != THISNODE
786	&& connectmode != conf_node::C_NEVER	850	&& connectmode != conf_node::C_NEVER
787	&& connectmode != conf_node::C_DISABLED	851	&& connectmode != conf_node::C_DISABLED
788	&& !w.is_active ())	852	&& !w.is_active ())
789	{	853	{
790	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection	854	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
791	// and stop trying. should probably be handled by a per-connection expire handler.	855	// and stop trying. should probably be handled by a per-connection expire handler.
792	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())	856	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
793	{	857	{
794	reset_connection ();	858	reset_connection ("no demand");
795	return;	859	return;
796	}	860	}
		861
		862	last_establish_attempt = ev_now ();
797		863
798	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	864	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
799	? (retry_cnt & 3) + 1	865	? (retry_cnt & 3) + 1
800	: 1 << (retry_cnt >> 2));	866	: 1 << (retry_cnt >> 2));
801		867
802	reset_si ();	868	reset_si ();
803		869
804	bool slow = si.prot & PROT_SLOW;	870	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
805		871
806	if (si.prot && !si.host)	872	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
807	{	873	{
808	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
809	/*TODO*/ /* start the timer so we don't recurse endlessly */	874	/*TODO*/ /* start the timer so we don't recurse endlessly */
810	w.start (1);	875	w.start (1);
811	vpn->send_connect_request (conf->id);	876	vpn->send_connect_request (this);
812	}	877	}
813	else	878	else
814	{	879	{
815	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	880	if (si.valid ())
		881	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		882	conf->nodename, (const char *)si);
816		883
817	const sockinfo &dsi = forward_si (si);	884	const sockinfo &dsi = forward_si (si);
818		885
819	slow = slow || (dsi.prot & PROT_SLOW);	886	slow = slow || (dsi.prot & PROT_SLOW);
820		887
821	if (dsi.valid () && auth_rate_limiter.can (dsi))	888	if (dsi.valid () && auth_rate_limiter.can (dsi))
822	{	889	{
823	if (retry_cnt < 4)	890	// use ping after the first few retries
		891	// TODO: on rekeys, the other node might not interpret ping correctly,
		892	// TODO: as it will still have a valid connection
		893	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
824	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
825	else	895	else
826	send_ping (dsi, 0);	896	send_ping (dsi, 0);
827	}	897	}
828	}	898	}
829		899
830	retry_int *= slow ? 8. : 0.7;	900	retry_int *= slow ? 4. : 0.9;
831		901
832	if (retry_int < conf->max_retry)	902	if (retry_int < conf->max_retry)
833	retry_cnt++;	903	retry_cnt++;
834	else	904	else
835	retry_int = conf->max_retry;	905	retry_int = conf->max_retry;
…		…
837	w.start (retry_int);	907	w.start (retry_int);
838	}	908	}
839	}	909	}
840		910
841	void	911	void
842	connection::reset_connection ()	912	connection::reset_connection (const char *reason)
843	{	913	{
844	if (ictx && octx)	914	if (ictx && octx)
845	{	915	{
846	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost (%s)"),
847	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si, reason);
848		918
849	if (::conf.script_node_down)	919	if (::conf.script_node_down)
850	{	920	{
851	run_script_cb cb;	921	run_script_cb *cb = new run_script_cb;
852	cb.set<connection, &connection::script_node_down> (this);	922	cb->set<connection, &connection::script_node_down> (this);
853	if (!run_script (cb, false))
854	slog (L_WARN, _("node-down command execution failed, continuing."));	923	run_script_queued (cb, _("node-down command execution failed, continuing."));
855	}	924	}
856	}	925	}
857		926
858	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
859	delete octx; octx = 0;	928	delete octx; octx = 0;
860	#if ENABLE_DNS
861	dnsv4_reset_connection ();
862	#endif
863		929
864	si.host = 0;	930	si.host = 0;
865		931
		932	have_snd_auth = false;
		933	have_rcv_auth = false;
		934	auth_expire = 0.;
		935
866	last_activity = 0;	936	last_activity = 0.;
		937	//last_si_change = 0.;
867	retry_cnt = 0;	938	retry_cnt = 0;
868		939
869	rekey.stop ();	940	rekey.stop ();
870	keepalive.stop ();	941	keepalive.stop ();
871	establish_connection.stop ();	942	establish_connection.stop ();
…		…
875	connection::shutdown ()	946	connection::shutdown ()
876	{	947	{
877	if (ictx && octx)	948	if (ictx && octx)
878	send_reset (si);	949	send_reset (si);
879		950
880	reset_connection ();	951	reset_connection ("shutdown");
881	}	952	}
882		953
		954	// poor-man's rekeying
883	inline void	955	inline void
884	connection::rekey_cb (ev::timer &w, int revents)	956	connection::rekey_cb (ev::timer &w, int revents)
885	{	957	{
886	reset_connection ();	958	reset_connection ("rekeying");
887	establish_connection ();	959	establish_connection ();
888	}	960	}
889		961
890	void	962	void
891	connection::send_data_packet (tap_packet *pkt)	963	connection::send_data_packet (tap_packet *pkt)
…		…
905	if (oseqno > MAX_SEQNO)	977	if (oseqno > MAX_SEQNO)
906	rekey ();	978	rekey ();
907	}	979	}
908		980
909	void	981	void
		982	connection::post_inject_queue ()
		983	{
		984	// force a connection every now and when when packets are sent (max 1/s)
		985	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		986	establish_connection.stop ();
		987
		988	establish_connection ();
		989	}
		990
		991	void
910	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	992	connection::inject_data_packet (tap_packet *pkt)
911	{	993	{
912	if (ictx && octx)	994	if (ictx && octx)
913	send_data_packet (pkt);	995	send_data_packet (pkt);
914	else	996	else
915	{	997	{
916	if (!broadcast)
917	data_queue.put (new tap_packet (*pkt));	998	data_queue.put (new tap_packet (*pkt));
918		999	post_inject_queue ();
919	establish_connection ();
920	}	1000	}
921	}	1001	}
922		1002
		1003	void
923	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1004	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
924	{	1005	{
925	if (ictx && octx)	1006	if (ictx && octx)
926	send_vpn_packet (pkt, si, tos);	1007	send_vpn_packet (pkt, si, tos);
927	else	1008	else
928	{	1009	{
929	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1010	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
930		1011	post_inject_queue ();
931	establish_connection ();
932	}	1012	}
933	}	1013	}
934		1014
935	void	1015	void
936	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1016	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
937	{	1017	{
938	last_activity = ev_now ();	1018	last_activity = ev_now ();
939		1019
940	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1020	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
941	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1021	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
942		1022
943	if (connectmode == conf_node::C_DISABLED)	1023	if (connectmode == conf_node::C_DISABLED)
944	return;	1024	return;
945		1025
946	switch (pkt->typ ())	1026	switch (pkt->typ ())
947	{	1027	{
948	case vpn_packet::PT_PING:	1028	case vpn_packet::PT_PING:
		1029	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1030
949	// we send pings instead of auth packets after some retries,	1031	// we send pings instead of auth packets after some retries,
950	// so reset the retry counter and establish a connection	1032	// so reset the retry counter and establish a connection
951	// when we receive a ping.	1033	// when we receive a ping.
952	if (!ictx)	1034	if (!ictx)
953	{	1035	{
954	if (auth_rate_limiter.can (rsi))	1036	if (auth_rate_limiter.can (rsi))
955	send_auth_request (rsi, true);	1037	send_auth_request (rsi, true);
956	}	1038	}
957	else	1039	else
		1040	// we would love to change the socket address here, but ping's aren't
		1041	// authenticated, so we best ignore it.
958	send_ping (rsi, 1); // pong	1042	send_ping (rsi, 1); // pong
959		1043
960	break;	1044	break;
961		1045
962	case vpn_packet::PT_PONG:	1046	case vpn_packet::PT_PONG:
		1047	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1048
		1049	// a PONG might mean that the other side doesn't really know
		1050	// about our desire for communication.
		1051	establish_connection ();
963	break;	1052	break;
964		1053
965	case vpn_packet::PT_RESET:	1054	case vpn_packet::PT_RESET:
		1055	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1056
		1057	if (ictx && octx)
966	{	1058	{
967	reset_connection ();	1059	reset_connection ("remote reset");
968		1060
969	config_packet *p = (config_packet *) pkt;	1061	config_packet *p = (config_packet *) pkt;
970		1062
971	if (!p->chk_config ())	1063	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
972	{
973	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
974	conf->nodename, (const char *)rsi);
975	connectmode = conf_node::C_DISABLED;
976	}
977	else if (connectmode == conf_node::C_ALWAYS)
978	establish_connection ();	1064	establish_connection ();
979	}	1065	}
		1066
980	break;	1067	break;
981		1068
982	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
983	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
984	{	1071	{
985	auth_req_packet *p = (auth_req_packet *) pkt;	1072	auth_req_packet *p = (auth_req_packet *)pkt;
986		1073
987	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1074	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1075	conf->nodename, p->initiate ? "initiate" : "reply",
		1076	p->protocols, p->features);
988		1077
989	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1078	if (memcmp (p->magic, MAGIC, 8))
		1079	{
		1080	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1081	conf->nodename, (const char *)rsi);
		1082	}
		1083	else if (p->chk_config (conf, rsi))
990	{	1084	{
991	if (p->prot_minor != PROTOCOL_MINOR)	1085	if (p->prot_minor != PROTOCOL_MINOR)
992	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1086	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
993	conf->nodename, (const char *)rsi,	1087	conf->nodename, (const char *)rsi,
994	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1088	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
995		1089
996	if (p->initiate)	1090	if (p->initiate)
		1091	{
997	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
998		1093
999	rsachallenge k;	1094	if (ictx && octx)
		1095	reset_connection ("reconnect");
		1096	}
1000		1097
		1098	auth_data auth;
		1099
1001	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1100	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
1002	{	1101	{
1003	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1102	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
1004	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1103	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
1005	break;
1006	}	1104	}
1007	else	1105	else
1008	{	1106	{
1009	delete octx;	1107	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
1010		1108
1011	octx = new crypto_ctx (k, 1);	1109	rcv_auth = auth;
1012	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1110	have_rcv_auth = true;
1013		1111
		1112	send_auth_response (rsi);
		1113
		1114	if (chg)
		1115	{
1014	conf->protocols = p->protocols;	1116	conf->protocols = p->protocols;
1015	features = p->features & config_packet::get_features ();	1117	features = p->features & config_packet::get_features ();
1016		1118
1017	send_auth_response (rsi, p->id, k);
1018
1019	connection_established ();	1119	connection_established (rsi);
1020
1021	break;	1120	}
1022	}	1121	}
		1122
		1123	break;
1023	}	1124	}
1024	else
1025	slog (L_WARN, _("%s(%s): protocol mismatch"),
1026	conf->nodename, (const char *)rsi);
1027		1125
1028	send_reset (rsi);	1126	send_reset (rsi);
1029	}	1127	}
1030		1128
1031	break;	1129	break;
1032		1130
1033	case vpn_packet::PT_AUTH_RES:	1131	case vpn_packet::PT_AUTH_RES:
1034	{	1132	{
1035	auth_res_packet *p = (auth_res_packet *) pkt;	1133	auth_res_packet *p = (auth_res_packet *)pkt;
1036		1134
1037	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1135	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
1038		1136
1039	if (p->chk_config ())	1137	auth_mac local_mac;
		1138	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1139
		1140	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
1040	{	1141	{
1041	if (p->prot_minor != PROTOCOL_MINOR)
1042	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1043	conf->nodename, (const char *)rsi,
1044	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1045
1046	rsachallenge chg;
1047
1048	if (!rsa_cache.find (p->id, chg))
1049	{
1050	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1142	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1051	conf->nodename, (const char *)rsi);	1143	conf->nodename, (const char *)rsi);
1052	break;
1053	}	1144	}
1054	else	1145	else if (!have_snd_auth)
1055	{	1146	{
1056	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1057		1148
1058	if (!p->hmac_chk (cctx))	1149	have_snd_auth = true;
1059	{
1060	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1061	"could be an attack, or just corruption or a synchronization error"),
1062	conf->nodename, (const char *)rsi);
1063	break;
1064	}
1065	else
1066	{
1067	rsaresponse h;
1068
1069	rsa_hash (p->id, chg, h);
1070
1071	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1072	{
1073	prot_minor = p->prot_minor;
1074
1075	delete ictx; ictx = cctx;
1076
1077	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1078
1079	si = rsi;
1080	protocol = rsi.prot;
1081
1082	connection_established ();	1150	connection_established (rsi);
1083
1084	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1085	conf->nodename, (const char *)rsi,
1086	p->prot_major, p->prot_minor);
1087
1088	if (::conf.script_node_up)
1089	{
1090	run_script_cb cb;
1091	cb.set<connection, &connection::script_node_up> (this);
1092	if (!run_script (cb, false))
1093	slog (L_WARN, _("node-up command execution failed, continuing."));
1094	}
1095
1096	break;
1097	}
1098	else
1099	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1100	conf->nodename, (const char *)rsi);
1101	}
1102
1103	delete cctx;
1104	}
1105	}	1151	}
1106	}	1152	}
1107
1108	send_reset (rsi);
1109	break;	1153	break;
1110		1154
1111	case vpn_packet::PT_DATA_COMPRESSED:	1155	case vpn_packet::PT_DATA_COMPRESSED:
1112	#if !ENABLE_COMPRESSION	1156	#if !ENABLE_COMPRESSION
1113	send_reset (rsi);	1157	send_reset (rsi);
…		…
1119	if (ictx && octx)	1163	if (ictx && octx)
1120	{	1164	{
1121	vpndata_packet *p = (vpndata_packet *)pkt;	1165	vpndata_packet *p = (vpndata_packet *)pkt;
1122		1166
1123	if (!p->hmac_chk (ictx))	1167	if (!p->hmac_chk (ictx))
		1168	{
		1169	// rekeying often creates temporary hmac auth floods
		1170	// we assume they don't take longer than a few seconds normally,
		1171	// and suppress messages and resets during that time.
		1172	//TODO: should be done per source address
		1173	if (!hmac_error)
		1174	{
		1175	hmac_error = ev_now () + 3;
		1176	break;
		1177	}
		1178	else if (hmac_error >= ev_now ())
		1179	break; // silently suppress
		1180	else
		1181	{
1124	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1182	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1125	"could be an attack, or just corruption or a synchronization error"),	1183	"could be an attack, or just corruption or a synchronization error."),
1126	conf->nodename, (const char *)rsi);	1184	conf->nodename, (const char *)rsi);
		1185	// reset
		1186	}
		1187	}
1127	else	1188	else
1128	{	1189	{
1129	u32 seqno;	1190	u32 seqno;
1130	tap_packet *d = p->unpack (this, seqno);	1191	tap_packet *d = p->unpack (this, seqno);
		1192	int seqclass = iseqno.seqno_classify (seqno);
1131		1193
1132	if (iseqno.recv_ok (seqno))	1194	hmac_error = 0;
		1195
		1196	if (seqclass == 0) // ok
1133	{	1197	{
1134	vpn->tap->send (d);	1198	vpn->tap->send (d);
1135		1199
1136	if (si != rsi)	1200	if (si != rsi)
1137	{	1201	{
1138	// fast re-sync on source address changes, useful especially for tcp/ip	1202	// fast re-sync on source address changes, useful especially for tcp/ip
		1203	//if (last_si_change < ev_now () + 5.)
1139	si = rsi;	1204	// {
1140
1141	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1205	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1142	conf->nodename, (const char *)si, (const char *)rsi);	1206	conf->nodename, (const char *)si, (const char *)rsi);
		1207
		1208	si = rsi;
		1209
		1210	if (::conf.script_node_change)
		1211	{
		1212	run_script_cb *cb = new run_script_cb;
		1213	cb->set<connection, &connection::script_node_change> (this);
		1214	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1215	}
		1216
		1217	// }
		1218	//else
		1219	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1220	// conf->nodename, (const char *)si, (const char *)rsi);
1143	}	1221	}
		1222	}
		1223	else if (seqclass == 1) // far history
		1224	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1225	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1226	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1227	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1228	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1229	else if (seqclass == 3) // reset
		1230	{
		1231	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1232	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1233	send_reset (rsi);
1144	}	1234	}
1145		1235
1146	delete d;	1236	delete d;
1147	break;	1237	break;
1148	}	1238	}
…		…
1152	break;	1242	break;
1153		1243
1154	case vpn_packet::PT_CONNECT_REQ:	1244	case vpn_packet::PT_CONNECT_REQ:
1155	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1245	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1156	{	1246	{
1157	connect_req_packet *p = (connect_req_packet *) pkt;	1247	connect_req_packet *p = (connect_req_packet *)pkt;
1158		1248
1159	if (p->id > 0 && p->id <= vpn->conns.size ())	1249	if (p->id > 0 && p->id <= vpn->conns.size ())
1160	{	1250	{
1161	connection *c = vpn->conns[p->id - 1];	1251	connection *c = vpn->conns[p->id - 1];
1162	conf->protocols = p->protocols;	1252	conf->protocols = p->protocols;
1163		1253
1164	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1254	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1255	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1256	p->protocols,
1165	conf->id, p->id, c->ictx && c->octx);	1257	c->ictx && c->octx);
1166		1258
1167	if (c->ictx && c->octx)	1259	if (c->ictx && c->octx)
1168	{	1260	{
1169	// send connect_info packets to both sides, in case one is	1261	// send connect_info packets to both sides, in case one is
1170	// behind a nat firewall (or both ;)	1262	// behind a nat firewall (or both ;)
…		…
1193		1285
1194	c->conf->protocols = p->protocols;	1286	c->conf->protocols = p->protocols;
1195	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1287	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1196	p->si.upgrade_protocol (protocol, c->conf);	1288	p->si.upgrade_protocol (protocol, c->conf);
1197		1289
1198	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1290	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1199	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1291	conf->nodename,
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si,
		1294	p->protocols,
		1295	protocol,
		1296	p->si.supported_protocols (c->conf),
		1297	!c->ictx && !c->octx);
1200		1298
1201	const sockinfo &dsi = forward_si (p->si);	1299	const sockinfo &dsi = forward_si (p->si);
1202		1300
1203	if (dsi.valid ())	1301	if (dsi.valid ())
1204	c->send_auth_request (dsi, true);	1302	c->send_auth_request (dsi, true);
		1303	else
		1304	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1305	vpn->conns[p->id - 1]->conf->nodename,
		1306	(const char *)p->si);
1205	}	1307	}
1206	else	1308	else
1207	slog (L_WARN,	1309	slog (L_WARN,
1208	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1310	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1209	p->id);	1311	p->id);
…		…
1218	}	1320	}
1219		1321
1220	inline void	1322	inline void
1221	connection::keepalive_cb (ev::timer &w, int revents)	1323	connection::keepalive_cb (ev::timer &w, int revents)
1222	{	1324	{
1223	if (ev_now () >= last_activity + ::conf.keepalive + 30)	1325	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1326
		1327	if (when >= 0)
		1328	w.start (when);
		1329	else if (when < -15)
1224	{	1330	{
1225	reset_connection ();	1331	reset_connection ("keepalive overdue");
1226	establish_connection ();	1332	establish_connection ();
1227	}	1333	}
1228	else if (ev_now () < last_activity + ::conf.keepalive)
1229	w.start (last_activity + ::conf.keepalive - ev::now ());
1230	else if (conf->connectmode != conf_node::C_ONDEMAND	1334	else if (conf->connectmode != conf_node::C_ONDEMAND
1231	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1335	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1232	{	1336	{
		1337	w.start (3);
1233	send_ping (si);	1338	send_ping (si);
1234	w.start (5);
1235	}	1339	}
1236	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1340	else if (when >= -10)
1237	// hold ondemand connections implicitly a few seconds longer	1341	// hold ondemand connections implicitly a few seconds longer
1238	// should delete octx, though, or something like that ;)	1342	// should delete octx, though, or something like that ;)
1239	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1343	w.start (when + 10);
1240	else	1344	else
1241	reset_connection ();	1345	reset_connection ("keepalive timeout");
1242	}	1346	}
1243		1347
		1348	void
1244	void connection::send_connect_request (int id)	1349	connection::send_connect_request (int id)
1245	{	1350	{
1246	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1351	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1247		1352
1248	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1353	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1354	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1355	THISNODE->protocols);
1249	p->hmac_set (octx);	1356	p->hmac_set (octx);
1250	send_vpn_packet (p, si);	1357	send_vpn_packet (p, si);
1251		1358
1252	delete p;	1359	delete p;
1253	}	1360	}
1254		1361
		1362	void
1255	void connection::script_init_env (const char *ext)	1363	connection::script_init_env (const char *ext)
1256	{	1364	{
1257	char *env;	1365	char *env;
1258	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1366	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1259	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1367	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1260	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1368	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1261	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1369	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1262	conf->id & 0xff); putenv (env);	1370	conf->id & 0xff); putenv (env);
1263	}	1371	}
1264		1372
		1373	void
1265	void connection::script_init_connect_env ()	1374	connection::script_init_connect_env ()
1266	{	1375	{
1267	vpn->script_init_env ();	1376	vpn->script_init_env ();
1268		1377
1269	char *env;	1378	char *env;
1270	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1379	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1380	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1271	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1381	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1272	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1382	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1273	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1383	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1274	}	1384	}
1275		1385
1276	inline const char *	1386	inline const char *
1277	connection::script_node_up ()	1387	connection::script_node_up ()
1278	{	1388	{
…		…
1288		1398
1289	return filename;	1399	return filename;
1290	}	1400	}
1291		1401
1292	inline const char *	1402	inline const char *
		1403	connection::script_node_change ()
		1404	{
		1405	script_init_connect_env ();
		1406
		1407	putenv ((char *)"STATE=change");
		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1414
		1415	return filename;
		1416	}
		1417
		1418	inline const char *
1293	connection::script_node_down ()	1419	connection::script_node_down ()
1294	{	1420	{
1295	script_init_connect_env ();	1421	script_init_connect_env ();
1296		1422
1297	putenv ((char *)"STATE=down");	1423	putenv ((char *)"STATE=down");
…		…
1308	connection::connection (struct vpn *vpn, conf_node *conf)	1434	connection::connection (struct vpn *vpn, conf_node *conf)
1309	: vpn(vpn), conf(conf),	1435	: vpn(vpn), conf(conf),
1310	#if ENABLE_DNS	1436	#if ENABLE_DNS
1311	dns (0),	1437	dns (0),
1312	#endif	1438	#endif
1313	data_queue(conf->max_ttl, conf->max_queue),	1439	data_queue(conf->max_ttl, conf->max_queue + 1),
1314	vpn_queue(conf->max_ttl, conf->max_queue)	1440	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1315	{	1441	{
1316	rekey .set<connection, &connection::rekey_cb > (this);	1442	rekey .set<connection, &connection::rekey_cb > (this);
1317	keepalive .set<connection, &connection::keepalive_cb > (this);	1443	keepalive .set<connection, &connection::keepalive_cb > (this);
1318	establish_connection.set<connection, &connection::establish_connection_cb> (this);	1444	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1319		1445
		1446	last_establish_attempt = 0.;
1320	octx = ictx = 0;	1447	octx = ictx = 0;
1321	retry_cnt = 0;
1322
1323	if (!conf->protocols) // make sure some protocol is enabled
1324	conf->protocols = PROT_UDPv4;
1325		1448
1326	connectmode = conf->connectmode;	1449	connectmode = conf->connectmode;
1327		1450
1328	// queue a dummy packet to force an initial connection attempt	1451	// queue a dummy packet to force an initial connection attempt
1329	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)	1452	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1330	{	1453	vpn_queue.put (new net_packet);
1331	net_packet *p = new net_packet;
1332	p->len = 0;
1333	vpn_queue.put (p);
1334	}
1335		1454
1336	reset_connection ();	1455	reset_connection ("startup");
1337	}	1456	}
1338		1457
1339	connection::~connection ()	1458	connection::~connection ()
1340	{	1459	{
1341	shutdown ();	1460	shutdown ();
1342	}	1461	}
1343		1462
		1463	void
1344	void connection_init ()	1464	connection_init ()
1345	{	1465	{
1346	auth_rate_limiter.clear ();	1466	auth_rate_limiter.clear ();
1347	reset_rate_limiter.clear ();	1467	reset_rate_limiter.clear ();
1348	}	1468	}
1349		1469

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