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Comparing gvpe/src/connection.C (file contents):
Revision 1.66 by pcg, Thu Dec 6 00:35:29 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
		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	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)
159	{	211	{
160	if (queue[i])	212	queue = new pkt [max_queue];
161	{
162	delete queue[i];
163	j = (j + 1) % QUEUEDEPTH;
164	}
165		213
166	queue[i] = p;
167
168	i = (i + 1) % QUEUEDEPTH;
169	}
170
171	net_packet *pkt_queue::get ()
172	{
173	net_packet *p = queue[j];
174
175	if (p)
176	{
177	queue[j] = 0;
178	j = (j + 1) % QUEUEDEPTH;
179	}
180
181	return p;
182	}
183
184	pkt_queue::pkt_queue ()
185	{
186	memset (queue, 0, sizeof (queue));
187	i = 0;	214	i = 0;
188	j = 0;	215	j = 0;
		216
		217	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
189	}	218	}
190		219
191	pkt_queue::~pkt_queue ()	220	pkt_queue::~pkt_queue ()
192	{	221	{
193	for (i = QUEUEDEPTH; --i > 0; )	222	while (net_packet *p = get ())
		223	delete p;
		224
194	delete queue[i];	225	delete [] queue;
		226	}
		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;
195	}	282	}
196		283
197	struct net_rateinfo	284	struct net_rateinfo
198	{	285	{
199	u32 host;	286	u32 host;
…		…
213		300
214	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	302	bool can (u32 host);
216	};	303	};
217		304
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	305	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		306
		307	bool
220	bool net_rate_limiter::can (u32 host)	308	net_rate_limiter::can (u32 host)
221	{	309	{
222	iterator i;	310	iterator i;
223		311
224	for (i = begin (); i != end (); )	312	for (i = begin (); i != end (); )
225	if (i->host == host)	313	if (i->host == host)
…		…
270	}	358	}
271	}	359	}
272		360
273	/////////////////////////////////////////////////////////////////////////////	361	/////////////////////////////////////////////////////////////////////////////
274		362
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	363	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	364	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	365	{
279	unsigned int xlen;	366	ctx->hctx.init ();
280		367	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
281	HMAC_CTX *hctx = &ctx->hctx;	368	ctx->hctx.digest (hmac_digest);
282
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
285	len - sizeof (hmac_packet));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	369	}
288		370
289	void	371	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	372	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	373	{
292	hmac_gen (ctx);	374	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		375	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	376	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	377	}
296		378
297	bool	379	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	380	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	381	{
300	hmac_gen (ctx);	382	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		383	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	384	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	385	}
304		386
		387	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	388	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	389	{
307	type = type_;	390	type = type_;
308		391
309	int src = THISNODE->id;	392	int src = THISNODE->id;
310		393
…		…
312	srcdst = ((src >> 8) << 4) | (dst >> 8);	395	srcdst = ((src >> 8) << 4) | (dst >> 8);
313	dst1 = dst;	396	dst1 = dst;
314	}	397	}
315		398
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	399	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		400
319	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
320	{	411	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno	412	// the distance from beginning of packet to data member
322		413	return data - at (0);
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	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	}
332		438
333	void	439	void
334	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)
335	{	441	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	442	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	444	ptype type = PT_DATA_UNCOMPRESSED;
339		445
340	#if ENABLE_COMPRESSION	446	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	447	u8 cdata[MAX_MTU];
342		448
343	if (conn->features & ENABLE_COMPRESSION)	449	if (conn->features & FEATURE_COMPRESSION)
344	{	450	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	451	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		452
347	if (cl)	453	if (cl)
348	{	454	{
…		…
354	d[1] = cl;	460	d[1] = cl;
355	}	461	}
356	}	462	}
357	#endif	463	#endif
358		464
		465	ctr = htonl (seqno);
		466
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	467	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
360
361	struct {
362	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];
364	#endif
365	u32 seqno;
366	} datahdr;
367
368	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
371	#endif
372		468
373	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	470	(unsigned char *)data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *)d, l));
376	outl += outl2;	472	outl += outl2;
377		473
378	require (EVP_EncryptUpdate (cctx,	474	// it seems this is a nop for us, but we do it anyways
379	(unsigned char *) data + outl, &outl2,	475	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
380	(unsigned char *) d, l));
381	outl += outl2;	476	outl += outl2;
382		477
383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
384	outl += outl2;
385
386	len = outl + data_hdr_size ();	478	len = data_hdr_size () + outl;
387		479
388	set_hdr (type, dst);	480	set_hdr (type, dst);
389		481
390	hmac_set (conn->octx);	482	hmac_set (conn->octx);
391	}	483	}
…		…
395	{	487	{
396	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	488	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
397	int outl = 0, outl2;	489	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	490	tap_packet *p = new tap_packet;
399	u8 *d;	491	u8 *d;
400	u32 l = len - data_hdr_size ();
401		492
		493	seqno = ntohl (ctr);
		494
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	495	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
403		496
404	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
406		499
407	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	501	d = cdata;
409	else	502	else
410	#endif	503	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6];
412		505
413	/* this overwrites part of the src mac, but we fix that later */	506	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	508	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	509	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	510	outl += outl2;
418		511
		512	// it seems this is a nop for us, but we do it anyways
419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
420	outl += outl2;	514	outl += outl2;
421		515
422	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
423
424	id2mac (dst () ? dst() : THISNODE->id, p->dst);	516	id2mac (dst () ? dst() : THISNODE->id, p->dst);
425	id2mac (src (), p->src);	517	id2mac (src (), p->src);
426		518
427	#if ENABLE_COMPRESSION	519	#if ENABLE_COMPRESSION
428	if (type == PT_DATA_COMPRESSED)	520	if (type == PT_DATA_COMPRESSED)
429	{	521	{
430	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	522	u32 cl = (d[0] << 8) | d[1];
431		523
432	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,
433	&(*p)[6 + 6], MAX_MTU)	525	&(*p)[6 + 6], MAX_MTU)
434	+ 6 + 6;	526	+ 6 + 6;
435	}	527	}
436	else	528	else
437	p->len = outl + (6 + 6 - DATAHDR);	529	p->len = outl + (6 + 6);
438	#endif	530	#endif
439		531
440	return p;	532	return p;
441	}	533	}
442		534
…		…
449	}	541	}
450	};	542	};
451		543
452	struct config_packet : vpn_packet	544	struct config_packet : vpn_packet
453	{	545	{
454	// actually, hmaclen cannot be checked because the hmac	546	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	548	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
460		550
461	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
462	bool chk_config () const;	552	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		553
464	static u8 get_features ()	554	static u8 get_features ()
465	{	555	{
466	u8 f = 0;	556	u8 f = 0;
467	#if ENABLE_COMPRESSION	557	#if ENABLE_COMPRESSION
…		…
475	#endif	565	#endif
476	return f;	566	return f;
477	}	567	}
478	};	568	};
479		569
		570	void
480	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
481	{	572	{
482	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
483	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
484	randsize = RAND_SIZE;
485	hmaclen = HMACLENGTH;
486	flags = 0;	575	flags = 0;
487	challengelen = sizeof (rsachallenge);
488	features = get_features ();	576	features = get_features ();
489		577
		578	strncpy ((char *)serial, conf.serial, sizeof (serial));
		579
490	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	580	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
491	digest_nid = htonl (EVP_MD_type (RSA_HASH));
492	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 ()));
493		583
494	len = sizeof (*this) - sizeof (net_packet);	584	len = sizeof (*this) - sizeof (net_packet);
495	set_hdr (type, dst);	585	set_hdr (type, dst);
496	}	586	}
497		587
498	bool config_packet::chk_config () const	588	bool
		589	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
499	{	590	{
500	if (prot_major != PROTOCOL_MAJOR)	591	if (prot_major != PROTOCOL_MAJOR)
501	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)"),
502	else if (randsize != RAND_SIZE)	593	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
503	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
504	else if (hmaclen != HMACLENGTH)
505	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
506	else if (challengelen != sizeof (rsachallenge))
507	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
508	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
509	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	595	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
510	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	596	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
511	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
512	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	597	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
513	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	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 ()));
514	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)
515	return true;	611	return true;
		612	}
516		613
517	return false;	614	return false;
518	}	615	}
519		616
520	struct auth_req_packet : config_packet	617	struct auth_req_packet : config_packet // UNPROTECTED
521	{	618	{
522	char magic[8];	619	char magic[8];
523	u8 initiate; // false if this is just an automatic reply	620	u8 initiate; // false if this is just an automatic reply
524	u8 protocols; // supported protocols (will be patched on forward)	621	u8 protocols; // supported protocols (will be patched on forward)
525	u8 pad2, pad3;	622	u8 pad2, pad3;
526	rsaid id;	623	auth_encr encr;
527	rsaencrdata encr;
528		624
529	auth_req_packet (int dst, bool initiate_, u8 protocols_)	625	auth_req_packet (int dst, bool initiate_, u8 protocols_)
530	{	626	{
531	config_packet::setup (PT_AUTH_REQ, dst);	627	config_packet::setup (PT_AUTH_REQ, dst);
532	strncpy (magic, MAGIC, 8);	628	memcpy (magic, MAGIC, 8);
533	initiate = !!initiate_;	629	initiate = !!initiate_;
534	protocols = protocols_;	630	protocols = protocols_;
535		631
536	len = sizeof (*this) - sizeof (net_packet);	632	len = sizeof (*this) - sizeof (net_packet);
537	}	633	}
538	};	634	};
539		635
540	struct auth_res_packet : config_packet	636	struct auth_res_packet : vpn_packet // UNPROTECTED
541	{	637	{
542	rsaid id;
543	u8 pad1, pad2, pad3;
544	u8 response_len; // encrypted length
545	rsaresponse response;	638	auth_response response;
546		639
547	auth_res_packet (int dst)	640	auth_res_packet (int dst)
548	{	641	{
549	config_packet::setup (PT_AUTH_RES, dst);	642	set_hdr (PT_AUTH_RES, dst);
550		643
551	len = sizeof (*this) - sizeof (net_packet);	644	len = sizeof (*this) - sizeof (net_packet);
552	}	645	}
553	};	646	};
554		647
…		…
584	};	677	};
585		678
586	/////////////////////////////////////////////////////////////////////////////	679	/////////////////////////////////////////////////////////////////////////////
587		680
588	void	681	void
589	connection::connection_established ()	682	connection::connection_established (const sockinfo &rsi)
590	{	683	{
591	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;
592		686
593	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."));
594	{	700	}
595	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);
596		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
597	// make sure rekeying timeouts are slightly asymmetric	708	// make sure rekeying timeouts are slightly asymmetric
598	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);
599	rekey.start (rekey_interval, rekey_interval);	710	rekey.start (rekey_interval, rekey_interval);
		711
		712	hmac_error = 0.;
		713
600	keepalive.start (::conf.keepalive);	714	keepalive.start (::conf.keepalive);
601		715
602	// send queued packets	716	// send queued packets
603	if (ictx && octx)
604	{
605	while (tap_packet *p = (tap_packet *)data_queue.get ())	717	while (tap_packet *p = (tap_packet *)data_queue.get ())
606	{	718	{
607	send_data_packet (p);	719	if (p->len) send_data_packet (p);
608	delete p;	720	delete p;
609	}	721	}
610		722
611	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	723	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612	{	724	{
613	send_vpn_packet (p, si, IPTOS_RELIABILITY);	725	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
614	delete p;	726	delete p;
615	}
616	}
617	}	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 ());
618	else	737	else
619	{	738	{
620	retry_cnt = 0;
621	establish_connection.start (5);
622	keepalive.stop ();
623	rekey.stop ();
624	}
625	}
626
627	void
628	connection::reset_si ()
629	{
630	protocol = best_protocol (THISNODE->protocols & conf->protocols);
631
632	// mask out protocols we cannot establish
633	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
634	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
635	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
636
637	if (protocol
638	&& (!conf->can_direct (THISNODE)
639	|| !THISNODE->can_direct (conf)))
640	{
641	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	739	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
642	protocol = 0;	740	protocol = 0;
643	}	741	}
644		742
645	si.set (conf, protocol);	743	si.set (conf, protocol);
646	}	744	}
…		…
649	const sockinfo &	747	const sockinfo &
650	connection::forward_si (const sockinfo &si) const	748	connection::forward_si (const sockinfo &si) const
651	{	749	{
652	if (!si.valid ())	750	if (!si.valid ())
653	{	751	{
654	connection *r = vpn->find_router ();	752	connection *r = vpn->find_router_for (this);
655		753
656	if (r)	754	if (r)
657	{	755	{
658	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."),
659	conf->nodename, r->conf->nodename, (const char *)r->si);	757	conf->nodename, r->conf->nodename);
660	return r->si;	758	return r->si;
661	}	759	}
662	else	760	else
663	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	761	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
664	conf->nodename);	762	conf->nodename);
665	}	763	}
666		764
667	return si;	765	return si;
668	}	766	}
669		767
670	void	768	void
671	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)
672	{	770	{
673	if (!vpn->send_vpn_packet (pkt, si, tos))	771	if (!vpn->send_vpn_packet (pkt, si, tos))
674	reset_connection ();	772	reset_connection ("packet send error");
675	}	773	}
676		774
677	void	775	void
678	connection::send_ping (const sockinfo &si, u8 pong)	776	connection::send_ping (const sockinfo &si, u8 pong)
679	{	777	{
680	ping_packet *pkt = new ping_packet;	778	ping_packet *pkt = new ping_packet;
681		779
682	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);
683	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	783	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684		784
685	delete pkt;	785	delete pkt;
686	}	786	}
687		787
…		…
702	void	802	void
703	connection::send_auth_request (const sockinfo &si, bool initiate)	803	connection::send_auth_request (const sockinfo &si, bool initiate)
704	{	804	{
705	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);
706		806
707	rsachallenge chg;	807	generate_auth_data ();
708	rsa_cache.gen (pkt->id, chg);
709	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	808	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
710		809
711	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);
712
713	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
714		812
715	delete pkt;	813	delete pkt;
716	}	814	}
717		815
718	void	816	void
719	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	817	connection::send_auth_response (const sockinfo &si)
720	{	818	{
721	auth_res_packet *pkt = new auth_res_packet (conf->id);	819	auth_res_packet *pkt = new auth_res_packet (conf->id);
722		820
723	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);
724		823
725	rsa_hash (id, chg, pkt->response);
726
727	pkt->hmac_set (octx);
728
729	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	824	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
730
731	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
732		826
733	delete pkt;	827	delete pkt;
734	}	828	}
735		829
736	void	830	void
737	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	831	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738	{	832	{
739	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	833	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
740	conf->id, rid, (const char *)rsi);	834	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		835	conf->protocols);
741		836
742	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);
743		838
744	r->hmac_set (octx);	839	r->hmac_set (octx);
745	send_vpn_packet (r, si);	840	send_vpn_packet (r, si);
…		…
748	}	843	}
749		844
750	inline void	845	inline void
751	connection::establish_connection_cb (ev::timer &w, int revents)	846	connection::establish_connection_cb (ev::timer &w, int revents)
752	{	847	{
753	if (!ictx	848	if (!(ictx && octx)
754	&& conf != THISNODE	849	&& conf != THISNODE
755	&& connectmode != conf_node::C_NEVER	850	&& connectmode != conf_node::C_NEVER
756	&& connectmode != conf_node::C_DISABLED	851	&& connectmode != conf_node::C_DISABLED
757	&& !w.is_active ())	852	&& !w.is_active ())
758	{	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
759	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	864	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760	? (retry_cnt & 3) + 1	865	? (retry_cnt & 3) + 1
761	: 1 << (retry_cnt >> 2));	866	: 1 << (retry_cnt >> 2));
762		867
763	reset_si ();	868	reset_si ();
764		869
765	bool slow = si.prot & PROT_SLOW;	870	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
766		871
767	if (si.prot && !si.host)	872	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
768	{	873	{
769	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770	/*TODO*/ /* start the timer so we don't recurse endlessly */	874	/*TODO*/ /* start the timer so we don't recurse endlessly */
771	w.start (1);	875	w.start (1);
772	vpn->send_connect_request (conf->id);	876	vpn->send_connect_request (this);
773	}	877	}
774	else	878	else
775	{	879	{
776	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);
777		883
778	const sockinfo &dsi = forward_si (si);	884	const sockinfo &dsi = forward_si (si);
779		885
780	slow = slow || (dsi.prot & PROT_SLOW);	886	slow = slow || (dsi.prot & PROT_SLOW);
781		887
782	if (dsi.valid () && auth_rate_limiter.can (dsi))	888	if (dsi.valid () && auth_rate_limiter.can (dsi))
783	{	889	{
784	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))
785	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
786	else	895	else
787	send_ping (dsi, 0);	896	send_ping (dsi, 0);
788	}	897	}
789	}	898	}
790		899
791	retry_int *= slow ? 8. : 0.7;	900	retry_int *= slow ? 4. : 0.9;
792		901
793	if (retry_int < conf->max_retry)	902	if (retry_int < conf->max_retry)
794	retry_cnt++;	903	retry_cnt++;
795	else	904	else
796	retry_int = conf->max_retry;	905	retry_int = conf->max_retry;
…		…
798	w.start (retry_int);	907	w.start (retry_int);
799	}	908	}
800	}	909	}
801		910
802	void	911	void
803	connection::reset_connection ()	912	connection::reset_connection (const char *reason)
804	{	913	{
805	if (ictx && octx)	914	if (ictx && octx)
806	{	915	{
807	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si, reason);
809		918
810	if (::conf.script_node_down)	919	if (::conf.script_node_down)
811	{	920	{
812	run_script_cb cb;	921	run_script_cb *cb = new run_script_cb;
813	cb.set<connection, &connection::script_node_down> (this);	922	cb->set<connection, &connection::script_node_down> (this);
814	if (!run_script (cb, false))
815	slog (L_WARN, _("node-down command execution failed, continuing."));	923	run_script_queued (cb, _("node-down command execution failed, continuing."));
816	}	924	}
817	}	925	}
818		926
819	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
820	delete octx; octx = 0;	928	delete octx; octx = 0;
821	#if ENABLE_DNS
822	dnsv4_reset_connection ();
823	#endif
824		929
825	si.host = 0;	930	si.host = 0;
826		931
		932	have_snd_auth = false;
		933	have_rcv_auth = false;
		934	auth_expire = 0.;
		935
827	last_activity = 0;	936	last_activity = 0.;
		937	//last_si_change = 0.;
828	retry_cnt = 0;	938	retry_cnt = 0;
829		939
830	rekey.stop ();	940	rekey.stop ();
831	keepalive.stop ();	941	keepalive.stop ();
832	establish_connection.stop ();	942	establish_connection.stop ();
…		…
836	connection::shutdown ()	946	connection::shutdown ()
837	{	947	{
838	if (ictx && octx)	948	if (ictx && octx)
839	send_reset (si);	949	send_reset (si);
840		950
841	reset_connection ();	951	reset_connection ("shutdown");
842	}	952	}
843		953
		954	// poor-man's rekeying
844	inline void	955	inline void
845	connection::rekey_cb (ev::timer &w, int revents)	956	connection::rekey_cb (ev::timer &w, int revents)
846	{	957	{
847	reset_connection ();	958	reset_connection ("rekeying");
848	establish_connection ();	959	establish_connection ();
849	}	960	}
850		961
851	void	962	void
852	connection::send_data_packet (tap_packet *pkt)	963	connection::send_data_packet (tap_packet *pkt)
…		…
866	if (oseqno > MAX_SEQNO)	977	if (oseqno > MAX_SEQNO)
867	rekey ();	978	rekey ();
868	}	979	}
869		980
870	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
871	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	992	connection::inject_data_packet (tap_packet *pkt)
872	{	993	{
873	if (ictx && octx)	994	if (ictx && octx)
874	send_data_packet (pkt);	995	send_data_packet (pkt);
875	else	996	else
876	{	997	{
877	if (!broadcast)
878	data_queue.put (new tap_packet (*pkt));	998	data_queue.put (new tap_packet (*pkt));
879		999	post_inject_queue ();
880	establish_connection ();
881	}	1000	}
882	}	1001	}
883		1002
		1003	void
884	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1004	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
885	{	1005	{
886	if (ictx && octx)	1006	if (ictx && octx)
887	send_vpn_packet (pkt, si, tos);	1007	send_vpn_packet (pkt, si, tos);
888	else	1008	else
889	{	1009	{
890	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1010	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
891		1011	post_inject_queue ();
892	establish_connection ();
893	}	1012	}
894	}	1013	}
895		1014
896	void	1015	void
897	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1016	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
898	{	1017	{
899	last_activity = ev_now ();	1018	last_activity = ev_now ();
900		1019
901	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.",
902	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1021	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
903		1022
904	if (connectmode == conf_node::C_DISABLED)	1023	if (connectmode == conf_node::C_DISABLED)
905	return;	1024	return;
906		1025
907	switch (pkt->typ ())	1026	switch (pkt->typ ())
908	{	1027	{
909	case vpn_packet::PT_PING:	1028	case vpn_packet::PT_PING:
		1029	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1030
910	// we send pings instead of auth packets after some retries,	1031	// we send pings instead of auth packets after some retries,
911	// so reset the retry counter and establish a connection	1032	// so reset the retry counter and establish a connection
912	// when we receive a ping.	1033	// when we receive a ping.
913	if (!ictx)	1034	if (!ictx)
914	{	1035	{
915	if (auth_rate_limiter.can (rsi))	1036	if (auth_rate_limiter.can (rsi))
916	send_auth_request (rsi, true);	1037	send_auth_request (rsi, true);
917	}	1038	}
918	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.
919	send_ping (rsi, 1); // pong	1042	send_ping (rsi, 1); // pong
920		1043
921	break;	1044	break;
922		1045
923	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 ();
924	break;	1052	break;
925		1053
926	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)
927	{	1058	{
928	reset_connection ();	1059	reset_connection ("remote reset");
929		1060
930	config_packet *p = (config_packet *) pkt;	1061	config_packet *p = (config_packet *) pkt;
931		1062
932	if (!p->chk_config ())	1063	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
933	{
934	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
935	conf->nodename, (const char *)rsi);
936	connectmode = conf_node::C_DISABLED;
937	}
938	else if (connectmode == conf_node::C_ALWAYS)
939	establish_connection ();	1064	establish_connection ();
940	}	1065	}
		1066
941	break;	1067	break;
942		1068
943	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
944	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
945	{	1071	{
946	auth_req_packet *p = (auth_req_packet *) pkt;	1072	auth_req_packet *p = (auth_req_packet *)pkt;
947		1073
948	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);
949		1077
950	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))
951	{	1084	{
952	if (p->prot_minor != PROTOCOL_MINOR)	1085	if (p->prot_minor != PROTOCOL_MINOR)
953	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."),
954	conf->nodename, (const char *)rsi,	1087	conf->nodename, (const char *)rsi,
955	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1088	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
956		1089
957	if (p->initiate)	1090	if (p->initiate)
		1091	{
958	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
959		1093
960	rsachallenge k;	1094	if (ictx && octx)
		1095	reset_connection ("reconnect");
		1096	}
961		1097
		1098	auth_data auth;
		1099
962	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1100	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
963	{	1101	{
964	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?"),
965	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));
966	break;
967	}	1104	}
968	else	1105	else
969	{	1106	{
970	delete octx;	1107	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
971		1108
972	octx = new crypto_ctx (k, 1);	1109	rcv_auth = auth;
973	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1110	have_rcv_auth = true;
974		1111
		1112	send_auth_response (rsi);
		1113
		1114	if (chg)
		1115	{
975	conf->protocols = p->protocols;	1116	conf->protocols = p->protocols;
976	features = p->features & config_packet::get_features ();	1117	features = p->features & config_packet::get_features ();
977		1118
978	send_auth_response (rsi, p->id, k);
979
980	connection_established ();	1119	connection_established (rsi);
981
982	break;	1120	}
983	}	1121	}
		1122
		1123	break;
984	}	1124	}
985	else
986	slog (L_WARN, _("%s(%s): protocol mismatch"),
987	conf->nodename, (const char *)rsi);
988		1125
989	send_reset (rsi);	1126	send_reset (rsi);
990	}	1127	}
991		1128
992	break;	1129	break;
993		1130
994	case vpn_packet::PT_AUTH_RES:	1131	case vpn_packet::PT_AUTH_RES:
995	{	1132	{
996	auth_res_packet *p = (auth_res_packet *) pkt;	1133	auth_res_packet *p = (auth_res_packet *)pkt;
997		1134
998	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1135	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
999		1136
1000	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))
1001	{	1141	{
1002	if (p->prot_minor != PROTOCOL_MINOR)
1003	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1004	conf->nodename, (const char *)rsi,
1005	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1006
1007	rsachallenge chg;
1008
1009	if (!rsa_cache.find (p->id, chg))
1010	{
1011	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1142	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1012	conf->nodename, (const char *)rsi);	1143	conf->nodename, (const char *)rsi);
1013	break;
1014	}	1144	}
1015	else	1145	else if (!have_snd_auth)
1016	{	1146	{
1017	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1018		1148
1019	if (!p->hmac_chk (cctx))	1149	have_snd_auth = true;
1020	{
1021	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1022	"could be an attack, or just corruption or a synchronization error"),
1023	conf->nodename, (const char *)rsi);
1024	break;
1025	}
1026	else
1027	{
1028	rsaresponse h;
1029
1030	rsa_hash (p->id, chg, h);
1031
1032	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1033	{
1034	prot_minor = p->prot_minor;
1035
1036	delete ictx; ictx = cctx;
1037
1038	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1039
1040	si = rsi;
1041	protocol = rsi.prot;
1042
1043	connection_established ();	1150	connection_established (rsi);
1044
1045	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1046	conf->nodename, (const char *)rsi,
1047	p->prot_major, p->prot_minor);
1048
1049	if (::conf.script_node_up)
1050	{
1051	run_script_cb cb;
1052	cb.set<connection, &connection::script_node_up> (this);
1053	if (!run_script (cb, false))
1054	slog (L_WARN, _("node-up command execution failed, continuing."));
1055	}
1056
1057	break;
1058	}
1059	else
1060	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1061	conf->nodename, (const char *)rsi);
1062	}
1063
1064	delete cctx;
1065	}
1066	}	1151	}
1067	}	1152	}
1068
1069	send_reset (rsi);
1070	break;	1153	break;
1071		1154
1072	case vpn_packet::PT_DATA_COMPRESSED:	1155	case vpn_packet::PT_DATA_COMPRESSED:
1073	#if !ENABLE_COMPRESSION	1156	#if !ENABLE_COMPRESSION
1074	send_reset (rsi);	1157	send_reset (rsi);
…		…
1080	if (ictx && octx)	1163	if (ictx && octx)
1081	{	1164	{
1082	vpndata_packet *p = (vpndata_packet *)pkt;	1165	vpndata_packet *p = (vpndata_packet *)pkt;
1083		1166
1084	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	{
1085	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"
1086	"could be an attack, or just corruption or a synchronization error"),	1183	"could be an attack, or just corruption or a synchronization error."),
1087	conf->nodename, (const char *)rsi);	1184	conf->nodename, (const char *)rsi);
		1185	// reset
		1186	}
		1187	}
1088	else	1188	else
1089	{	1189	{
1090	u32 seqno;	1190	u32 seqno;
1091	tap_packet *d = p->unpack (this, seqno);	1191	tap_packet *d = p->unpack (this, seqno);
		1192	int seqclass = iseqno.seqno_classify (seqno);
1092		1193
1093	if (iseqno.recv_ok (seqno))	1194	hmac_error = 0;
		1195
		1196	if (seqclass == 0) // ok
1094	{	1197	{
1095	vpn->tap->send (d);	1198	vpn->tap->send (d);
1096		1199
1097	if (si != rsi)	1200	if (si != rsi)
1098	{	1201	{
1099	// 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.)
1100	si = rsi;	1204	// {
1101
1102	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1205	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1103	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);
1104	}	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);
1105	}	1234	}
1106		1235
1107	delete d;	1236	delete d;
1108	break;	1237	break;
1109	}	1238	}
…		…
1113	break;	1242	break;
1114		1243
1115	case vpn_packet::PT_CONNECT_REQ:	1244	case vpn_packet::PT_CONNECT_REQ:
1116	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1245	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1117	{	1246	{
1118	connect_req_packet *p = (connect_req_packet *) pkt;	1247	connect_req_packet *p = (connect_req_packet *)pkt;
1119		1248
1120	if (p->id > 0 && p->id <= vpn->conns.size ())	1249	if (p->id > 0 && p->id <= vpn->conns.size ())
1121	{	1250	{
1122	connection *c = vpn->conns[p->id - 1];	1251	connection *c = vpn->conns[p->id - 1];
1123	conf->protocols = p->protocols;	1252	conf->protocols = p->protocols;
1124		1253
1125	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,
1126	conf->id, p->id, c->ictx && c->octx);	1257	c->ictx && c->octx);
1127		1258
1128	if (c->ictx && c->octx)	1259	if (c->ictx && c->octx)
1129	{	1260	{
1130	// send connect_info packets to both sides, in case one is	1261	// send connect_info packets to both sides, in case one is
1131	// behind a nat firewall (or both ;)	1262	// behind a nat firewall (or both ;)
…		…
1154		1285
1155	c->conf->protocols = p->protocols;	1286	c->conf->protocols = p->protocols;
1156	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));
1157	p->si.upgrade_protocol (protocol, c->conf);	1288	p->si.upgrade_protocol (protocol, c->conf);
1158		1289
1159	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]",
1160	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);
1161		1298
1162	const sockinfo &dsi = forward_si (p->si);	1299	const sockinfo &dsi = forward_si (p->si);
1163		1300
1164	if (dsi.valid ())	1301	if (dsi.valid ())
1165	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);
1166	}	1307	}
1167	else	1308	else
1168	slog (L_WARN,	1309	slog (L_WARN,
1169	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1310	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1170	p->id);	1311	p->id);
…		…
1179	}	1320	}
1180		1321
1181	inline void	1322	inline void
1182	connection::keepalive_cb (ev::timer &w, int revents)	1323	connection::keepalive_cb (ev::timer &w, int revents)
1183	{	1324	{
1184	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)
1185	{	1330	{
1186	reset_connection ();	1331	reset_connection ("keepalive overdue");
1187	establish_connection ();	1332	establish_connection ();
1188	}	1333	}
1189	else if (ev_now () < last_activity + ::conf.keepalive)
1190	w.start (last_activity + ::conf.keepalive - ev::now ());
1191	else if (conf->connectmode != conf_node::C_ONDEMAND	1334	else if (conf->connectmode != conf_node::C_ONDEMAND
1192	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1335	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1193	{	1336	{
		1337	w.start (3);
1194	send_ping (si);	1338	send_ping (si);
1195	w.start (5);
1196	}	1339	}
1197	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1340	else if (when >= -10)
1198	// hold ondemand connections implicitly a few seconds longer	1341	// hold ondemand connections implicitly a few seconds longer
1199	// should delete octx, though, or something like that ;)	1342	// should delete octx, though, or something like that ;)
1200	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1343	w.start (when + 10);
1201	else	1344	else
1202	reset_connection ();	1345	reset_connection ("keepalive timeout");
1203	}	1346	}
1204		1347
		1348	void
1205	void connection::send_connect_request (int id)	1349	connection::send_connect_request (int id)
1206	{	1350	{
1207	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);
1208		1352
1209	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);
1210	p->hmac_set (octx);	1356	p->hmac_set (octx);
1211	send_vpn_packet (p, si);	1357	send_vpn_packet (p, si);
1212		1358
1213	delete p;	1359	delete p;
1214	}	1360	}
1215		1361
		1362	void
1216	void connection::script_init_env (const char *ext)	1363	connection::script_init_env (const char *ext)
1217	{	1364	{
1218	char *env;	1365	char *env;
1219	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);
1220	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1367	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1221	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1368	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1222	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1369	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1223	conf->id & 0xff); putenv (env);	1370	conf->id & 0xff); putenv (env);
1224	}	1371	}
1225		1372
		1373	void
1226	void connection::script_init_connect_env ()	1374	connection::script_init_connect_env ()
1227	{	1375	{
1228	vpn->script_init_env ();	1376	vpn->script_init_env ();
1229		1377
1230	char *env;	1378	char *env;
1231	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);
1232	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1381	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1233	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1382	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1234	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1383	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1235	}	1384	}
1236		1385
1237	inline const char *	1386	inline const char *
1238	connection::script_node_up ()	1387	connection::script_node_up ()
1239	{	1388	{
…		…
1249		1398
1250	return filename;	1399	return filename;
1251	}	1400	}
1252		1401
1253	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 *
1254	connection::script_node_down ()	1419	connection::script_node_down ()
1255	{	1420	{
1256	script_init_connect_env ();	1421	script_init_connect_env ();
1257		1422
1258	putenv ((char *)"STATE=down");	1423	putenv ((char *)"STATE=down");
…		…
1265		1430
1266	return filename;	1431	return filename;
1267	}	1432	}
1268		1433
1269	connection::connection (struct vpn *vpn, conf_node *conf)	1434	connection::connection (struct vpn *vpn, conf_node *conf)
1270	: vpn(vpn), conf(conf)	1435	: vpn(vpn), conf(conf),
1271	#if ENABLE_DNS	1436	#if ENABLE_DNS
1272	, dns (0)	1437	dns (0),
1273	#endif	1438	#endif
		1439	data_queue(conf->max_ttl, conf->max_queue + 1),
		1440	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1274	{	1441	{
1275	rekey .set<connection, &connection::rekey_cb > (this);	1442	rekey .set<connection, &connection::rekey_cb > (this);
1276	keepalive .set<connection, &connection::keepalive_cb > (this);	1443	keepalive .set<connection, &connection::keepalive_cb > (this);
1277	establish_connection.set<connection, &connection::establish_connection_cb> (this);	1444	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1278		1445
		1446	last_establish_attempt = 0.;
1279	octx = ictx = 0;	1447	octx = ictx = 0;
1280	retry_cnt = 0;
1281		1448
1282	if (!conf->protocols) // make sure some protocol is enabled	1449	connectmode = conf->connectmode;
1283	conf->protocols = PROT_UDPv4;
1284		1450
1285	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
1286	reset_connection ();	1455	reset_connection ("startup");
1287	}	1456	}
1288		1457
1289	connection::~connection ()	1458	connection::~connection ()
1290	{	1459	{
1291	shutdown ();	1460	shutdown ();
1292	}	1461	}
1293		1462
		1463	void
1294	void connection_init ()	1464	connection_init ()
1295	{	1465	{
1296	auth_rate_limiter.clear ();	1466	auth_rate_limiter.clear ();
1297	reset_rate_limiter.clear ();	1467	reset_rate_limiter.clear ();
1298	}	1468	}
1299		1469

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