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Comparing gvpe/src/connection.C (file contents):
Revision 1.62 by pcg, Sat Dec 1 23:35:31 2007 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
88	tstamp expire;	191	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	192	{
95	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;	193	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	194	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	195	// request data
102	{	196	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	197	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		198
105	erase (i);	199	// eventual response data
106	return true;	200	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	201	}
109		202
110	if (!cleaner.is_active ())	203	// every use prolongs the expiry
111	cleaner.again ();
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = ev_now () + RSA_TTL;	204	auth_expire = ev_now () + AUTH_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (!cleaner.is_active ())
130	cleaner.again ();
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{
136	cleaner.set (RSA_TTL, RSA_TTL);
137	}
138
139	} rsa_cache;
140
141	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
142	{
143	if (empty ())
144	w.stop ();
145	else
146	{
147	for (iterator i = begin (); i != end (); )
148	if (i->expire <= ev_now ())
149	i = erase (i);
150	else
151	++i;
152	}
153	}	205	}
154		206
155	//////////////////////////////////////////////////////////////////////////////	207	//////////////////////////////////////////////////////////////////////////////
156		208
157	void pkt_queue::put (net_packet *p)	209	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		210	: max_ttl (max_ttl), max_queue (max_queue)
158	{	211	{
159	if (queue[i])	212	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		213
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	214	i = 0;
187	j = 0;	215	j = 0;
		216
		217	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	218	}
189		219
190	pkt_queue::~pkt_queue ()	220	pkt_queue::~pkt_queue ()
191	{	221	{
192	for (i = QUEUEDEPTH; --i > 0; )	222	while (net_packet *p = get ())
		223	delete p;
		224
193	delete queue[i];	225	delete [] queue;
194	}	226	}
195		227
		228	void
		229	pkt_queue::expire_cb (ev::timer &w, int revents)
		230	{
		231	ev_tstamp expire = ev_now () - max_ttl;
		232
		233	for (;;)
		234	{
		235	if (empty ())
		236	break;
		237
		238	double diff = queue[j].tstamp - expire;
		239
		240	if (diff >= 0.)
		241	{
		242	w.start (diff > 0.5 ? diff : 0.5);
		243	break;
		244	}
		245
		246	delete get ();
		247	}
		248	}
		249
		250	void
		251	pkt_queue::put (net_packet *p)
		252	{
		253	ev_tstamp now = ev_now ();
		254
		255	// start expiry timer
		256	if (empty ())
		257	expire.start (max_ttl);
		258
		259	int ni = i + 1 == max_queue ? 0 : i + 1;
		260
		261	if (ni == j)
		262	delete get ();
		263
		264	queue[i].pkt = p;
		265	queue[i].tstamp = now;
		266
		267	i = ni;
		268	}
		269
		270	net_packet *
		271	pkt_queue::get ()
		272	{
		273	if (empty ())
		274	return 0;
		275
		276	net_packet *p = queue[j].pkt;
		277	queue[j].pkt = 0;
		278
		279	j = j + 1 == max_queue ? 0 : j + 1;
		280
		281	return p;
		282	}
		283
196	struct net_rateinfo {	284	struct net_rateinfo
		285	{
197	u32 host;	286	u32 host;
198	double pcnt, diff;	287	double pcnt, diff;
199	tstamp last;	288	tstamp last;
200	};	289	};
201		290
…		…
211		300
212	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	302	bool can (u32 host);
214	};	303	};
215		304
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	305	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		306
		307	bool
218	bool net_rate_limiter::can (u32 host)	308	net_rate_limiter::can (u32 host)
219	{	309	{
220	iterator i;	310	iterator i;
221		311
222	for (i = begin (); i != end (); )	312	for (i = begin (); i != end (); )
223	if (i->host == host)	313	if (i->host == host)
…		…
268	}	358	}
269	}	359	}
270		360
271	/////////////////////////////////////////////////////////////////////////////	361	/////////////////////////////////////////////////////////////////////////////
272		362
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	363	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	364	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	365	{
277	unsigned int xlen;	366	ctx->hctx.init ();
278		367	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
279	HMAC_CTX *hctx = &ctx->hctx;	368	ctx->hctx.digest (hmac_digest);
280
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
283	len - sizeof (hmac_packet));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	369	}
286		370
287	void	371	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	372	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	373	{
290	hmac_gen (ctx);	374	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		375	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	376	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	377	}
294		378
295	bool	379	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	380	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	381	{
298	hmac_gen (ctx);	382	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		383	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	384	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	385	}
302		386
		387	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	388	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	389	{
305	type = type_;	390	type = type_;
306		391
307	int src = THISNODE->id;	392	int src = THISNODE->id;
308		393
…		…
310	srcdst = ((src >> 8) << 4) | (dst >> 8);	395	srcdst = ((src >> 8) << 4) | (dst >> 8);
311	dst1 = dst;	396	dst1 = dst;
312	}	397	}
313		398
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	399	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		400
317	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
318	{	411	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno	412	// the distance from beginning of packet to data member
320		413	return data - at (0);
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	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	}
330		438
331	void	439	void
332	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)
333	{	441	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	442	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	444	ptype type = PT_DATA_UNCOMPRESSED;
337		445
338	#if ENABLE_COMPRESSION	446	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	447	u8 cdata[MAX_MTU];
340		448
341	if (conn->features & ENABLE_COMPRESSION)	449	if (conn->features & FEATURE_COMPRESSION)
342	{	450	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	451	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		452
345	if (cl)	453	if (cl)
346	{	454	{
…		…
352	d[1] = cl;	460	d[1] = cl;
353	}	461	}
354	}	462	}
355	#endif	463	#endif
356		464
		465	ctr = htonl (seqno);
		466
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	467	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
358
359	struct {
360	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];
362	#endif
363	u32 seqno;
364	} datahdr;
365
366	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
369	#endif
370		468
371	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	470	(unsigned char *)data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *)d, l));
374	outl += outl2;	472	outl += outl2;
375		473
376	require (EVP_EncryptUpdate (cctx,	474	// it seems this is a nop for us, but we do it anyways
377	(unsigned char *) data + outl, &outl2,	475	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
378	(unsigned char *) d, l));
379	outl += outl2;	476	outl += outl2;
380		477
381	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
382	outl += outl2;
383
384	len = outl + data_hdr_size ();	478	len = data_hdr_size () + outl;
385		479
386	set_hdr (type, dst);	480	set_hdr (type, dst);
387		481
388	hmac_set (conn->octx);	482	hmac_set (conn->octx);
389	}	483	}
…		…
393	{	487	{
394	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	488	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
395	int outl = 0, outl2;	489	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	490	tap_packet *p = new tap_packet;
397	u8 *d;	491	u8 *d;
398	u32 l = len - data_hdr_size ();
399		492
		493	seqno = ntohl (ctr);
		494
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	495	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
401		496
402	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
404		499
405	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	501	d = cdata;
407	else	502	else
408	#endif	503	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6];
410		505
411	/* this overwrites part of the src mac, but we fix that later */	506	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	508	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	509	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	510	outl += outl2;
416		511
		512	// it seems this is a nop for us, but we do it anyways
417	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
418	outl += outl2;	514	outl += outl2;
419		515
420	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
421
422	id2mac (dst () ? dst() : THISNODE->id, p->dst);	516	id2mac (dst () ? dst() : THISNODE->id, p->dst);
423	id2mac (src (), p->src);	517	id2mac (src (), p->src);
424		518
425	#if ENABLE_COMPRESSION	519	#if ENABLE_COMPRESSION
426	if (type == PT_DATA_COMPRESSED)	520	if (type == PT_DATA_COMPRESSED)
427	{	521	{
428	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	522	u32 cl = (d[0] << 8) | d[1];
429		523
430	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,
431	&(*p)[6 + 6], MAX_MTU)	525	&(*p)[6 + 6], MAX_MTU)
432	+ 6 + 6;	526	+ 6 + 6;
433	}	527	}
434	else	528	else
435	p->len = outl + (6 + 6 - DATAHDR);	529	p->len = outl + (6 + 6);
436	#endif	530	#endif
437		531
438	return p;	532	return p;
439	}	533	}
440		534
…		…
447	}	541	}
448	};	542	};
449		543
450	struct config_packet : vpn_packet	544	struct config_packet : vpn_packet
451	{	545	{
452	// actually, hmaclen cannot be checked because the hmac	546	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	548	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
458		550
459	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
460	bool chk_config () const;	552	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		553
462	static u8 get_features ()	554	static u8 get_features ()
463	{	555	{
464	u8 f = 0;	556	u8 f = 0;
465	#if ENABLE_COMPRESSION	557	#if ENABLE_COMPRESSION
…		…
473	#endif	565	#endif
474	return f;	566	return f;
475	}	567	}
476	};	568	};
477		569
		570	void
478	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
479	{	572	{
480	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;
484	flags = 0;	575	flags = 0;
485	challengelen = sizeof (rsachallenge);
486	features = get_features ();	576	features = get_features ();
487		577
		578	strncpy ((char *)serial, conf.serial, sizeof (serial));
		579
488	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	580	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
489	digest_nid = htonl (EVP_MD_type (RSA_HASH));
490	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 ()));
491		583
492	len = sizeof (*this) - sizeof (net_packet);	584	len = sizeof (*this) - sizeof (net_packet);
493	set_hdr (type, dst);	585	set_hdr (type, dst);
494	}	586	}
495		587
496	bool config_packet::chk_config () const	588	bool
		589	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
497	{	590	{
498	if (prot_major != PROTOCOL_MAJOR)	591	if (prot_major != PROTOCOL_MAJOR)
499	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)"),
500	else if (randsize != RAND_SIZE)	593	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
501	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
502	else if (hmaclen != HMACLENGTH)
503	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
504	else if (challengelen != sizeof (rsachallenge))
505	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
506	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
507	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)"),
508	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	596	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
510	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	597	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
511	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 ()));
512	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)
513	return true;	611	return true;
		612	}
514		613
515	return false;	614	return false;
516	}	615	}
517		616
518	struct auth_req_packet : config_packet	617	struct auth_req_packet : config_packet // UNPROTECTED
519	{	618	{
520	char magic[8];	619	char magic[8];
521	u8 initiate; // false if this is just an automatic reply	620	u8 initiate; // false if this is just an automatic reply
522	u8 protocols; // supported protocols (will be patched on forward)	621	u8 protocols; // supported protocols (will be patched on forward)
523	u8 pad2, pad3;	622	u8 pad2, pad3;
524	rsaid id;	623	auth_encr encr;
525	rsaencrdata encr;
526		624
527	auth_req_packet (int dst, bool initiate_, u8 protocols_)	625	auth_req_packet (int dst, bool initiate_, u8 protocols_)
528	{	626	{
529	config_packet::setup (PT_AUTH_REQ, dst);	627	config_packet::setup (PT_AUTH_REQ, dst);
530	strncpy (magic, MAGIC, 8);	628	memcpy (magic, MAGIC, 8);
531	initiate = !!initiate_;	629	initiate = !!initiate_;
532	protocols = protocols_;	630	protocols = protocols_;
533		631
534	len = sizeof (*this) - sizeof (net_packet);	632	len = sizeof (*this) - sizeof (net_packet);
535	}	633	}
536	};	634	};
537		635
538	struct auth_res_packet : config_packet	636	struct auth_res_packet : vpn_packet // UNPROTECTED
539	{	637	{
540	rsaid id;
541	u8 pad1, pad2, pad3;
542	u8 response_len; // encrypted length
543	rsaresponse response;	638	auth_response response;
544		639
545	auth_res_packet (int dst)	640	auth_res_packet (int dst)
546	{	641	{
547	config_packet::setup (PT_AUTH_RES, dst);	642	set_hdr (PT_AUTH_RES, dst);
548		643
549	len = sizeof (*this) - sizeof (net_packet);	644	len = sizeof (*this) - sizeof (net_packet);
550	}	645	}
551	};	646	};
552		647
…		…
582	};	677	};
583		678
584	/////////////////////////////////////////////////////////////////////////////	679	/////////////////////////////////////////////////////////////////////////////
585		680
586	void	681	void
587	connection::connection_established ()	682	connection::connection_established (const sockinfo &rsi)
588	{	683	{
589	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;
590		686
591	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."));
592	{	700	}
593	connectmode = conf->connectmode;	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);
594		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
595	// make sure rekeying timeouts are slightly asymmetric	708	// make sure rekeying timeouts are slightly asymmetric
596	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);
597	rekey.start (rekey_interval, rekey_interval);	710	rekey.start (rekey_interval, rekey_interval);
		711
		712	hmac_error = 0.;
		713
598	keepalive.start (::conf.keepalive);	714	keepalive.start (::conf.keepalive);
599		715
600	// send queued packets	716	// send queued packets
601	if (ictx && octx)
602	{
603	while (tap_packet *p = (tap_packet *)data_queue.get ())	717	while (tap_packet *p = (tap_packet *)data_queue.get ())
604	{	718	{
605	send_data_packet (p);	719	if (p->len) send_data_packet (p);
606	delete p;	720	delete p;
607	}	721	}
608		722
609	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	723	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
610	{	724	{
611	send_vpn_packet (p, si, IPTOS_RELIABILITY);	725	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
612	delete p;	726	delete p;
613	}
614	}
615	}	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 ());
616	else	737	else
617	{	738	{
618	retry_cnt = 0;
619	establish_connection.start (5);
620	keepalive.stop ();
621	rekey.stop ();
622	}
623	}
624
625	void
626	connection::reset_si ()
627	{
628	protocol = best_protocol (THISNODE->protocols & conf->protocols);
629
630	// mask out protocols we cannot establish
631	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
632	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
633	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
634
635	if (protocol
636	&& (!conf->can_direct (THISNODE)
637	|| !THISNODE->can_direct (conf)))
638	{
639	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	739	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
640	protocol = 0;	740	protocol = 0;
641	}	741	}
642		742
643	si.set (conf, protocol);	743	si.set (conf, protocol);
644	}	744	}
…		…
647	const sockinfo &	747	const sockinfo &
648	connection::forward_si (const sockinfo &si) const	748	connection::forward_si (const sockinfo &si) const
649	{	749	{
650	if (!si.valid ())	750	if (!si.valid ())
651	{	751	{
652	connection *r = vpn->find_router ();	752	connection *r = vpn->find_router_for (this);
653		753
654	if (r)	754	if (r)
655	{	755	{
656	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."),
657	conf->nodename, r->conf->nodename, (const char *)r->si);	757	conf->nodename, r->conf->nodename);
658	return r->si;	758	return r->si;
659	}	759	}
660	else	760	else
661	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	761	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
662	conf->nodename);	762	conf->nodename);
663	}	763	}
664		764
665	return si;	765	return si;
666	}	766	}
667		767
668	void	768	void
669	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)
670	{	770	{
671	if (!vpn->send_vpn_packet (pkt, si, tos))	771	if (!vpn->send_vpn_packet (pkt, si, tos))
672	reset_connection ();	772	reset_connection ("packet send error");
673	}	773	}
674		774
675	void	775	void
676	connection::send_ping (const sockinfo &si, u8 pong)	776	connection::send_ping (const sockinfo &si, u8 pong)
677	{	777	{
678	ping_packet *pkt = new ping_packet;	778	ping_packet *pkt = new ping_packet;
679		779
680	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);
681	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	783	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
682		784
683	delete pkt;	785	delete pkt;
684	}	786	}
685		787
…		…
700	void	802	void
701	connection::send_auth_request (const sockinfo &si, bool initiate)	803	connection::send_auth_request (const sockinfo &si, bool initiate)
702	{	804	{
703	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);
704		806
705	rsachallenge chg;	807	generate_auth_data ();
706	rsa_cache.gen (pkt->id, chg);
707	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	808	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
708		809
709	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);
710
711	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
712		812
713	delete pkt;	813	delete pkt;
714	}	814	}
715		815
716	void	816	void
717	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	817	connection::send_auth_response (const sockinfo &si)
718	{	818	{
719	auth_res_packet *pkt = new auth_res_packet (conf->id);	819	auth_res_packet *pkt = new auth_res_packet (conf->id);
720		820
721	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);
722		823
723	rsa_hash (id, chg, pkt->response);
724
725	pkt->hmac_set (octx);
726
727	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);
728
729	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
730		826
731	delete pkt;	827	delete pkt;
732	}	828	}
733		829
734	void	830	void
735	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	831	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
736	{	832	{
737	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	833	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
738	conf->id, rid, (const char *)rsi);	834	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		835	conf->protocols);
739		836
740	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);
741		838
742	r->hmac_set (octx);	839	r->hmac_set (octx);
743	send_vpn_packet (r, si);	840	send_vpn_packet (r, si);
744		841
745	delete r;	842	delete r;
746	}	843	}
747		844
748	void	845	inline void
749	connection::establish_connection_cb (ev::timer &w, int revents)	846	connection::establish_connection_cb (ev::timer &w, int revents)
750	{	847	{
751	if (!ictx	848	if (!(ictx && octx)
752	&& conf != THISNODE	849	&& conf != THISNODE
753	&& connectmode != conf_node::C_NEVER	850	&& connectmode != conf_node::C_NEVER
754	&& connectmode != conf_node::C_DISABLED	851	&& connectmode != conf_node::C_DISABLED
755	&& !w.is_active ())	852	&& !w.is_active ())
756	{	853	{
		854	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		855	// and stop trying. should probably be handled by a per-connection expire handler.
		856	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		857	{
		858	reset_connection ("no demand");
		859	return;
		860	}
		861
		862	last_establish_attempt = ev_now ();
		863
757	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	864	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
758	? (retry_cnt & 3) + 1	865	? (retry_cnt & 3) + 1
759	: 1 << (retry_cnt >> 2));	866	: 1 << (retry_cnt >> 2));
760		867
761	reset_si ();	868	reset_si ();
762		869
763	bool slow = si.prot & PROT_SLOW;	870	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
764		871
765	if (si.prot && !si.host)	872	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
766	{	873	{
767	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
768	/*TODO*/ /* start the timer so we don't recurse endlessly */	874	/*TODO*/ /* start the timer so we don't recurse endlessly */
769	w.start (1);	875	w.start (1);
770	vpn->send_connect_request (conf->id);	876	vpn->send_connect_request (this);
771	}	877	}
772	else	878	else
773	{	879	{
774	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);
775		883
776	const sockinfo &dsi = forward_si (si);	884	const sockinfo &dsi = forward_si (si);
777		885
778	slow = slow || (dsi.prot & PROT_SLOW);	886	slow = slow || (dsi.prot & PROT_SLOW);
779		887
780	if (dsi.valid () && auth_rate_limiter.can (dsi))	888	if (dsi.valid () && auth_rate_limiter.can (dsi))
781	{	889	{
782	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))
783	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
784	else	895	else
785	send_ping (dsi, 0);	896	send_ping (dsi, 0);
786	}	897	}
787	}	898	}
788		899
789	retry_int *= slow ? 8. : 0.7;	900	retry_int *= slow ? 4. : 0.9;
790		901
791	if (retry_int < conf->max_retry)	902	if (retry_int < conf->max_retry)
792	retry_cnt++;	903	retry_cnt++;
793	else	904	else
794	retry_int = conf->max_retry;	905	retry_int = conf->max_retry;
…		…
796	w.start (retry_int);	907	w.start (retry_int);
797	}	908	}
798	}	909	}
799		910
800	void	911	void
801	connection::reset_connection ()	912	connection::reset_connection (const char *reason)
802	{	913	{
803	if (ictx && octx)	914	if (ictx && octx)
804	{	915	{
805	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost (%s)"),
806	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si, reason);
807		918
808	if (::conf.script_node_down)	919	if (::conf.script_node_down)
809	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	920	{
		921	run_script_cb *cb = new run_script_cb;
		922	cb->set<connection, &connection::script_node_down> (this);
810	slog (L_WARN, _("node-down command execution failed, continuing."));	923	run_script_queued (cb, _("node-down command execution failed, continuing."));
		924	}
811	}	925	}
812		926
813	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
814	delete octx; octx = 0;	928	delete octx; octx = 0;
815	#if ENABLE_DNS
816	dnsv4_reset_connection ();
817	#endif
818		929
819	si.host = 0;	930	si.host = 0;
820		931
		932	have_snd_auth = false;
		933	have_rcv_auth = false;
		934	auth_expire = 0.;
		935
821	last_activity = 0;	936	last_activity = 0.;
		937	//last_si_change = 0.;
822	retry_cnt = 0;	938	retry_cnt = 0;
823		939
824	rekey.stop ();	940	rekey.stop ();
825	keepalive.stop ();	941	keepalive.stop ();
826	establish_connection.stop ();	942	establish_connection.stop ();
…		…
830	connection::shutdown ()	946	connection::shutdown ()
831	{	947	{
832	if (ictx && octx)	948	if (ictx && octx)
833	send_reset (si);	949	send_reset (si);
834		950
835	reset_connection ();	951	reset_connection ("shutdown");
836	}	952	}
837		953
838	void	954	// poor-man's rekeying
		955	inline void
839	connection::rekey_cb (ev::timer &w, int revents)	956	connection::rekey_cb (ev::timer &w, int revents)
840	{	957	{
841	reset_connection ();	958	reset_connection ("rekeying");
842	establish_connection ();	959	establish_connection ();
843	}	960	}
844		961
845	void	962	void
846	connection::send_data_packet (tap_packet *pkt)	963	connection::send_data_packet (tap_packet *pkt)
…		…
860	if (oseqno > MAX_SEQNO)	977	if (oseqno > MAX_SEQNO)
861	rekey ();	978	rekey ();
862	}	979	}
863		980
864	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
865	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	992	connection::inject_data_packet (tap_packet *pkt)
866	{	993	{
867	if (ictx && octx)	994	if (ictx && octx)
868	send_data_packet (pkt);	995	send_data_packet (pkt);
869	else	996	else
870	{	997	{
871	if (!broadcast)
872	data_queue.put (new tap_packet (*pkt));	998	data_queue.put (new tap_packet (*pkt));
873		999	post_inject_queue ();
874	establish_connection ();
875	}	1000	}
876	}	1001	}
877		1002
		1003	void
878	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1004	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
879	{	1005	{
880	if (ictx && octx)	1006	if (ictx && octx)
881	send_vpn_packet (pkt, si, tos);	1007	send_vpn_packet (pkt, si, tos);
882	else	1008	else
883	{	1009	{
884	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1010	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
885		1011	post_inject_queue ();
886	establish_connection ();
887	}	1012	}
888	}	1013	}
889		1014
890	void	1015	void
891	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1016	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
892	{	1017	{
893	last_activity = ev_now ();	1018	last_activity = ev_now ();
894		1019
895	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.",
896	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1021	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
897		1022
898	if (connectmode == conf_node::C_DISABLED)	1023	if (connectmode == conf_node::C_DISABLED)
899	return;	1024	return;
900		1025
901	switch (pkt->typ ())	1026	switch (pkt->typ ())
902	{	1027	{
903	case vpn_packet::PT_PING:	1028	case vpn_packet::PT_PING:
		1029	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1030
904	// we send pings instead of auth packets after some retries,	1031	// we send pings instead of auth packets after some retries,
905	// so reset the retry counter and establish a connection	1032	// so reset the retry counter and establish a connection
906	// when we receive a ping.	1033	// when we receive a ping.
907	if (!ictx)	1034	if (!ictx)
908	{	1035	{
909	if (auth_rate_limiter.can (rsi))	1036	if (auth_rate_limiter.can (rsi))
910	send_auth_request (rsi, true);	1037	send_auth_request (rsi, true);
911	}	1038	}
912	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.
913	send_ping (rsi, 1); // pong	1042	send_ping (rsi, 1); // pong
914		1043
915	break;	1044	break;
916		1045
917	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 ();
918	break;	1052	break;
919		1053
920	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)
921	{	1058	{
922	reset_connection ();	1059	reset_connection ("remote reset");
923		1060
924	config_packet *p = (config_packet *) pkt;	1061	config_packet *p = (config_packet *) pkt;
925		1062
926	if (!p->chk_config ())	1063	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
927	{
928	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
929	conf->nodename, (const char *)rsi);
930	connectmode = conf_node::C_DISABLED;
931	}
932	else if (connectmode == conf_node::C_ALWAYS)
933	establish_connection ();	1064	establish_connection ();
934	}	1065	}
		1066
935	break;	1067	break;
936		1068
937	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
938	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
939	{	1071	{
940	auth_req_packet *p = (auth_req_packet *) pkt;	1072	auth_req_packet *p = (auth_req_packet *)pkt;
941		1073
942	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);
943		1077
944	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))
945	{	1084	{
946	if (p->prot_minor != PROTOCOL_MINOR)	1085	if (p->prot_minor != PROTOCOL_MINOR)
947	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."),
948	conf->nodename, (const char *)rsi,	1087	conf->nodename, (const char *)rsi,
949	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1088	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
950		1089
951	if (p->initiate)	1090	if (p->initiate)
		1091	{
952	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
953		1093
954	rsachallenge k;	1094	if (ictx && octx)
		1095	reset_connection ("reconnect");
		1096	}
955		1097
		1098	auth_data auth;
		1099
956	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1100	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
957	{	1101	{
958	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?"),
959	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));
960	break;
961	}	1104	}
962	else	1105	else
963	{	1106	{
964	delete octx;	1107	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
965		1108
966	octx = new crypto_ctx (k, 1);	1109	rcv_auth = auth;
967	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1110	have_rcv_auth = true;
968		1111
		1112	send_auth_response (rsi);
		1113
		1114	if (chg)
		1115	{
969	conf->protocols = p->protocols;	1116	conf->protocols = p->protocols;
970	features = p->features & config_packet::get_features ();	1117	features = p->features & config_packet::get_features ();
971		1118
972	send_auth_response (rsi, p->id, k);
973
974	connection_established ();	1119	connection_established (rsi);
975
976	break;	1120	}
977	}	1121	}
		1122
		1123	break;
978	}	1124	}
979	else
980	slog (L_WARN, _("%s(%s): protocol mismatch"),
981	conf->nodename, (const char *)rsi);
982		1125
983	send_reset (rsi);	1126	send_reset (rsi);
984	}	1127	}
985		1128
986	break;	1129	break;
987		1130
988	case vpn_packet::PT_AUTH_RES:	1131	case vpn_packet::PT_AUTH_RES:
989	{	1132	{
990	auth_res_packet *p = (auth_res_packet *) pkt;	1133	auth_res_packet *p = (auth_res_packet *)pkt;
991		1134
992	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1135	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
993		1136
994	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))
995	{	1141	{
996	if (p->prot_minor != PROTOCOL_MINOR)
997	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
998	conf->nodename, (const char *)rsi,
999	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1000
1001	rsachallenge chg;
1002
1003	if (!rsa_cache.find (p->id, chg))
1004	{
1005	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1142	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1006	conf->nodename, (const char *)rsi);	1143	conf->nodename, (const char *)rsi);
1007	break;
1008	}	1144	}
1009	else	1145	else if (!have_snd_auth)
1010	{	1146	{
1011	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1012		1148
1013	if (!p->hmac_chk (cctx))	1149	have_snd_auth = true;
1014	{
1015	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1016	"could be an attack, or just corruption or a synchronization error"),
1017	conf->nodename, (const char *)rsi);
1018	break;
1019	}
1020	else
1021	{
1022	rsaresponse h;
1023
1024	rsa_hash (p->id, chg, h);
1025
1026	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1027	{
1028	prot_minor = p->prot_minor;
1029
1030	delete ictx; ictx = cctx;
1031
1032	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1033
1034	si = rsi;
1035	protocol = rsi.prot;
1036
1037	connection_established ();	1150	connection_established (rsi);
1038
1039	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1040	conf->nodename, (const char *)rsi,
1041	p->prot_major, p->prot_minor);
1042
1043	if (::conf.script_node_up)
1044	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1045	slog (L_WARN, _("node-up command execution failed, continuing."));
1046
1047	break;
1048	}
1049	else
1050	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1051	conf->nodename, (const char *)rsi);
1052	}
1053
1054	delete cctx;
1055	}
1056	}	1151	}
1057	}	1152	}
1058
1059	send_reset (rsi);
1060	break;	1153	break;
1061		1154
1062	case vpn_packet::PT_DATA_COMPRESSED:	1155	case vpn_packet::PT_DATA_COMPRESSED:
1063	#if !ENABLE_COMPRESSION	1156	#if !ENABLE_COMPRESSION
1064	send_reset (rsi);	1157	send_reset (rsi);
…		…
1070	if (ictx && octx)	1163	if (ictx && octx)
1071	{	1164	{
1072	vpndata_packet *p = (vpndata_packet *)pkt;	1165	vpndata_packet *p = (vpndata_packet *)pkt;
1073		1166
1074	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	{
1075	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"
1076	"could be an attack, or just corruption or a synchronization error"),	1183	"could be an attack, or just corruption or a synchronization error."),
1077	conf->nodename, (const char *)rsi);	1184	conf->nodename, (const char *)rsi);
		1185	// reset
		1186	}
		1187	}
1078	else	1188	else
1079	{	1189	{
1080	u32 seqno;	1190	u32 seqno;
1081	tap_packet *d = p->unpack (this, seqno);	1191	tap_packet *d = p->unpack (this, seqno);
		1192	int seqclass = iseqno.seqno_classify (seqno);
1082		1193
1083	if (iseqno.recv_ok (seqno))	1194	hmac_error = 0;
		1195
		1196	if (seqclass == 0) // ok
1084	{	1197	{
1085	vpn->tap->send (d);	1198	vpn->tap->send (d);
1086		1199
1087	if (si != rsi)	1200	if (si != rsi)
1088	{	1201	{
1089	// 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.)
1090	si = rsi;	1204	// {
1091
1092	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1205	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1093	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);
1094	}	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);
1095	}	1234	}
1096		1235
1097	delete d;	1236	delete d;
1098	break;	1237	break;
1099	}	1238	}
…		…
1103	break;	1242	break;
1104		1243
1105	case vpn_packet::PT_CONNECT_REQ:	1244	case vpn_packet::PT_CONNECT_REQ:
1106	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1245	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1107	{	1246	{
1108	connect_req_packet *p = (connect_req_packet *) pkt;	1247	connect_req_packet *p = (connect_req_packet *)pkt;
1109		1248
1110	if (p->id > 0 && p->id <= vpn->conns.size ())	1249	if (p->id > 0 && p->id <= vpn->conns.size ())
1111	{	1250	{
1112	connection *c = vpn->conns[p->id - 1];	1251	connection *c = vpn->conns[p->id - 1];
1113	conf->protocols = p->protocols;	1252	conf->protocols = p->protocols;
1114		1253
1115	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,
1116	conf->id, p->id, c->ictx && c->octx);	1257	c->ictx && c->octx);
1117		1258
1118	if (c->ictx && c->octx)	1259	if (c->ictx && c->octx)
1119	{	1260	{
1120	// send connect_info packets to both sides, in case one is	1261	// send connect_info packets to both sides, in case one is
1121	// behind a nat firewall (or both ;)	1262	// behind a nat firewall (or both ;)
…		…
1144		1285
1145	c->conf->protocols = p->protocols;	1286	c->conf->protocols = p->protocols;
1146	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));
1147	p->si.upgrade_protocol (protocol, c->conf);	1288	p->si.upgrade_protocol (protocol, c->conf);
1148		1289
1149	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]",
1150	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);
1151		1298
1152	const sockinfo &dsi = forward_si (p->si);	1299	const sockinfo &dsi = forward_si (p->si);
1153		1300
1154	if (dsi.valid ())	1301	if (dsi.valid ())
1155	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);
1156	}	1307	}
1157	else	1308	else
1158	slog (L_WARN,	1309	slog (L_WARN,
1159	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1310	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1160	p->id);	1311	p->id);
…		…
1166	send_reset (rsi);	1317	send_reset (rsi);
1167	break;	1318	break;
1168	}	1319	}
1169	}	1320	}
1170		1321
		1322	inline void
1171	void connection::keepalive_cb (ev::timer &w, int revents)	1323	connection::keepalive_cb (ev::timer &w, int revents)
1172	{	1324	{
1173	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)
1174	{	1330	{
1175	reset_connection ();	1331	reset_connection ("keepalive overdue");
1176	establish_connection ();	1332	establish_connection ();
1177	}	1333	}
1178	else if (ev_now () < last_activity + ::conf.keepalive)
1179	w.start (last_activity + ::conf.keepalive - ev::now ());
1180	else if (conf->connectmode != conf_node::C_ONDEMAND	1334	else if (conf->connectmode != conf_node::C_ONDEMAND
1181	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1335	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1182	{	1336	{
		1337	w.start (3);
1183	send_ping (si);	1338	send_ping (si);
1184	w.start (5);
1185	}	1339	}
1186	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1340	else if (when >= -10)
1187	// hold ondemand connections implicitly a few seconds longer	1341	// hold ondemand connections implicitly a few seconds longer
1188	// should delete octx, though, or something like that ;)	1342	// should delete octx, though, or something like that ;)
1189	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1343	w.start (when + 10);
1190	else	1344	else
1191	reset_connection ();	1345	reset_connection ("keepalive timeout");
1192	}	1346	}
1193		1347
		1348	void
1194	void connection::send_connect_request (int id)	1349	connection::send_connect_request (int id)
1195	{	1350	{
1196	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);
1197		1352
1198	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);
1199	p->hmac_set (octx);	1356	p->hmac_set (octx);
1200	send_vpn_packet (p, si);	1357	send_vpn_packet (p, si);
1201		1358
1202	delete p;	1359	delete p;
1203	}	1360	}
1204		1361
		1362	void
1205	void connection::script_init_env (const char *ext)	1363	connection::script_init_env (const char *ext)
1206	{	1364	{
1207	char *env;	1365	char *env;
1208	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);
1209	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1367	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1210	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1368	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1211	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1369	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1212	conf->id & 0xff); putenv (env);	1370	conf->id & 0xff); putenv (env);
1213	}	1371	}
1214		1372
		1373	void
1215	void connection::script_init_connect_env ()	1374	connection::script_init_connect_env ()
1216	{	1375	{
1217	vpn->script_init_env ();	1376	vpn->script_init_env ();
1218		1377
1219	char *env;	1378	char *env;
1220	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);
1221	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1381	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1222	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1382	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1223	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1383	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1224	}	1384	}
1225		1385
		1386	inline const char *
1226	const char *connection::script_node_up ()	1387	connection::script_node_up ()
1227	{	1388	{
1228	script_init_connect_env ();	1389	script_init_connect_env ();
1229		1390
1230	putenv ((char *)"STATE=up");	1391	putenv ((char *)"STATE=up");
1231		1392
…		…
1236	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1397	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1237		1398
1238	return filename;	1399	return filename;
1239	}	1400	}
1240		1401
		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 *
1241	const char *connection::script_node_down ()	1419	connection::script_node_down ()
1242	{	1420	{
1243	script_init_connect_env ();	1421	script_init_connect_env ();
1244		1422
1245	putenv ((char *)"STATE=down");	1423	putenv ((char *)"STATE=down");
1246		1424
…		…
1252		1430
1253	return filename;	1431	return filename;
1254	}	1432	}
1255		1433
1256	connection::connection (struct vpn *vpn, conf_node *conf)	1434	connection::connection (struct vpn *vpn, conf_node *conf)
1257	: vpn(vpn), conf(conf)	1435	: vpn(vpn), conf(conf),
1258	, rekey (this, &connection::rekey_cb)
1259	, keepalive (this, &connection::keepalive_cb)
1260	, establish_connection (this, &connection::establish_connection_cb)
1261	#if ENABLE_DNS	1436	#if ENABLE_DNS
1262	, dns (0)	1437	dns (0),
1263	#endif	1438	#endif
		1439	data_queue(conf->max_ttl, conf->max_queue + 1),
		1440	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1264	{	1441	{
		1442	rekey .set<connection, &connection::rekey_cb > (this);
		1443	keepalive .set<connection, &connection::keepalive_cb > (this);
		1444	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1445
		1446	last_establish_attempt = 0.;
1265	octx = ictx = 0;	1447	octx = ictx = 0;
1266	retry_cnt = 0;
1267		1448
1268	if (!conf->protocols) // make sure some protocol is enabled	1449	connectmode = conf->connectmode;
1269	conf->protocols = PROT_UDPv4;
1270		1450
1271	connectmode = conf_node::C_ALWAYS; // initial setting	1451	// queue a dummy packet to force an initial connection attempt
		1452	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1453	vpn_queue.put (new net_packet);
		1454
1272	reset_connection ();	1455	reset_connection ("startup");
1273	}	1456	}
1274		1457
1275	connection::~connection ()	1458	connection::~connection ()
1276	{	1459	{
1277	shutdown ();	1460	shutdown ();
1278	}	1461	}
1279		1462
		1463	void
1280	void connection_init ()	1464	connection_init ()
1281	{	1465	{
1282	auth_rate_limiter.clear ();	1466	auth_rate_limiter.clear ();
1283	reset_rate_limiter.clear ();	1467	reset_rate_limiter.clear ();
1284	}	1468	}
1285		1469

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