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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 1.116 by root, Mon Apr 1 03:10:26 2019 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
		56	#define LZF_STATE_ARG 1
45	#define ULTRA_FAST 1	57	#define ULTRA_FAST 1
46	#define HLOG 15	58	#define HLOG 15
47	#include "lzf/lzf.h"	59	#define INIT_HTAB 0
48	#include "lzf/lzf_c.c"	60	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	61	#include "lzf/lzf_d.c"
50		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	namespace
		69	{
		70	void // c++ requires external linkage here, apparently :(
		71	rs_child_cb (ev::child &w, int revents)
		72	{
		73	w.stop ();
		74
		75	if (rs_queue.empty ())
		76	return;
		77
		78	pid_t pid = run_script (*rs_queue.front ().first, false);
		79	if (pid)
		80	{
		81	w.set (pid);
		82	w.start ();
		83	}
		84	else
		85	slog (L_WARN, rs_queue.front ().second);
		86
		87	delete rs_queue.front ().first;
		88	rs_queue.pop ();
		89	}
		90	};
		91
		92	// despite the fancy name, this is quite a hack
		93	static void
		94	run_script_queued (run_script_cb *cb, const char *warnmsg)
		95	{
		96	rs_queue.push (std::make_pair (cb, warnmsg));
		97
		98	if (!rs_child_ev.is_active ())
		99	{
		100	rs_child_ev.set<rs_child_cb> ();
		101	rs_child_ev ();
		102	}
		103	}
		104
		105	//////////////////////////////////////////////////////////////////////////////
		106
51	struct crypto_ctx	107	struct crypto_ctx
52	{	108	{
53	EVP_CIPHER_CTX cctx;	109	cipher cctx;
54	HMAC_CTX hctx;	110	hmac hctx;
55		111
56	crypto_ctx (const rsachallenge &challenge, int enc);	112	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	113	~crypto_ctx ();
58	};	114	};
59		115
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	116	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	117	{
		118	ecdh_key s;
		119
		120	curve25519_combine (a, b, s);
		121
		122	{
		123	u8 mac_key[MAC_KEYSIZE];
		124	static const unsigned char mac_info[] = "gvpe mac key";
		125
		126	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		127	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		128	kdf.extract (s, sizeof (s));
		129	kdf.extract_done (HKDF_PRF_HASH ());
		130	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		131
		132	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
62	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	146	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	147	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	148	}
67		149
68	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
69	{	151	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	152	require (EVP_CIPHER_CTX_cleanup (cctx));
71	HMAC_CTX_cleanup (&hctx);	153	}
		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
72	}	180	}
73		181
74	static void	182	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	184	{
77	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	188	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	}	189	}
86		190
87	struct rsa_entry	191	void
		192	connection::generate_auth_data ()
88	{	193	{
89	tstamp expire;	194	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	{	195	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	196	// request data
103	{	197	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
105		199
106	erase (i);	200	// eventual response data
107	return true;	201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	202	}
110		203
111	if (!cleaner.is_active ())	204	// 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;	205	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	}	206	}
155		207
156	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
157		209
158	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
159	{	212	{
160	if (queue[i])	213	queue = new pkt [max_queue];
161	{
162	delete queue[i];
163	j = (j + 1) % QUEUEDEPTH;
164	}
165		214
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;	215	i = 0;
188	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
189	}	219	}
190		220
191	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
192	{	222	{
193	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
194	delete queue[i];	226	delete [] queue;
		227	}
		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
195	}	283	}
196		284
197	struct net_rateinfo	285	struct net_rateinfo
198	{	286	{
199	u32 host;	287	u32 host;
…		…
213		301
214	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	303	bool can (u32 host);
216	};	304	};
217		305
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		307
		308	bool
220	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
221	{	310	{
222	iterator i;	311	iterator i;
223		312
224	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
225	if (i->host == host)	314	if (i->host == host)
…		…
270	}	359	}
271	}	360	}
272		361
273	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
274		363
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	366	{
279	unsigned int xlen;	367	ctx->hctx.init ();
280		368	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
281	HMAC_CTX *hctx = &ctx->hctx;	369	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	}	370	}
288		371
289	void	372	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	373	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	374	{
292	hmac_gen (ctx);	375	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		376	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	377	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	378	}
296		379
297	bool	380	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	381	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	382	{
300	hmac_gen (ctx);	383	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		384	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	385	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	386	}
304		387
		388	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	389	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	390	{
307	type = type_;	391	type = type_;
308		392
309	int src = THISNODE->id;	393	int src = THISNODE->id;
310		394
…		…
312	srcdst = ((src >> 8) << 4) | (dst >> 8);	396	srcdst = ((src >> 8) << 4) | (dst >> 8);
313	dst1 = dst;	397	dst1 = dst;
314	}	398	}
315		399
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	400	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		401
319	struct vpndata_packet : vpn_packet	402	struct vpndata_packet : vpn_packet
		403	{
		404	u32 ctr; // seqno
		405	u8 data[MAXVPNDATA];
		406
		407	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		408	tap_packet *unpack (connection *conn, u32 &seqno);
		409
		410	private:
		411	const u32 data_hdr_size () const
320	{	412	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno	413	// the distance from beginning of packet to data member
322		414	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	};	415	}
		416	};
		417
		418	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		419	static unsigned char *
		420	expand_iv (u32 ctr)
		421	{
		422	static u32 iv[IV_SIZE (CIPHER) / 4];
		423
		424	require (sizeof (iv) == 4 * 4);
		425	require (IV_SIZE (CIPHER) % 4 == 0);
		426
		427	iv[0] =
		428	iv[1] =
		429	iv[2] = ctr;
		430
		431	// I would reuse ctr here to to avoid potential endianness issues,
		432	// but it seems openssl wraps around. While this would be still ok,
		433	// and I don't even know if its true, let's play safe and initialise
		434	// to 0.
		435	iv[3] = 0;
		436
		437	return (unsigned char *)iv;
		438	}
332		439
333	void	440	void
334	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	441	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
335	{	442	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	443	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
337	int outl = 0, outl2;	444	int outl = 0, outl2;
338	ptype type = PT_DATA_UNCOMPRESSED;	445	ptype type = PT_DATA_UNCOMPRESSED;
339		446
340	#if ENABLE_COMPRESSION	447	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	448	u8 cdata[MAX_MTU];
342		449
343	if (conn->features & ENABLE_COMPRESSION)	450	if (conn->features & FEATURE_COMPRESSION)
344	{	451	{
		452	static LZF_STATE lzf_state;
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	453	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7, lzf_state);
346		454
347	if (cl)	455	if (cl)
348	{	456	{
349	type = PT_DATA_COMPRESSED;	457	type = PT_DATA_COMPRESSED;
350	d = cdata;	458	d = cdata;
…		…
354	d[1] = cl;	462	d[1] = cl;
355	}	463	}
356	}	464	}
357	#endif	465	#endif
358		466
		467	ctr = htonl (seqno);
		468
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	469	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		470
373	require (EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	472	(unsigned char *)data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	473	(unsigned char *)d, l));
376	outl += outl2;	474	outl += outl2;
377		475
378	require (EVP_EncryptUpdate (cctx,	476	// it seems this is a nop for us, but we do it anyways
379	(unsigned char *) data + outl, &outl2,	477	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
380	(unsigned char *) d, l));
381	outl += outl2;	478	outl += outl2;
382		479
383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
384	outl += outl2;
385
386	len = outl + data_hdr_size ();	480	len = data_hdr_size () + outl;
387		481
388	set_hdr (type, dst);	482	set_hdr (type, dst);
389		483
390	hmac_set (conn->octx);	484	hmac_set (conn->octx);
391	}	485	}
392		486
393	tap_packet *	487	tap_packet *
394	vpndata_packet::unpack (connection *conn, u32 &seqno)	488	vpndata_packet::unpack (connection *conn, u32 &seqno)
395	{	489	{
396	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	490	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
397	int outl = 0, outl2;	491	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	492	tap_packet *p = new tap_packet;
399	u8 *d;	493	u8 *d;
400	u32 l = len - data_hdr_size ();
401		494
		495	seqno = ntohl (ctr);
		496
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
403		498
404	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
406		501
407	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	503	d = cdata;
409	else	504	else
410	#endif	505	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6];
412		507
413	/* this overwrites part of the src mac, but we fix that later */	508	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	509	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	510	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	511	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	512	outl += outl2;
418		513
		514	// it seems this is a nop for us, but we do it anyways
419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
420	outl += outl2;	516	outl += outl2;
421		517
422	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
423
424	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
425	id2mac (src (), p->src);	519	id2mac (src (), p->src);
426		520
427	#if ENABLE_COMPRESSION	521	#if ENABLE_COMPRESSION
428	if (type == PT_DATA_COMPRESSED)	522	if (type == PT_DATA_COMPRESSED)
429	{	523	{
430	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	524	u32 cl = (d[0] << 8) | d[1];
431		525
432	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	526	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
433	&(*p)[6 + 6], MAX_MTU)	527	&(*p)[6 + 6], MAX_MTU)
434	+ 6 + 6;	528	+ 6 + 6;
435	}	529	}
436	else	530	else
437	p->len = outl + (6 + 6 - DATAHDR);	531	p->len = outl + (6 + 6);
438	#endif	532	#endif
439		533
440	return p;	534	return p;
441	}	535	}
442		536
…		…
449	}	543	}
450	};	544	};
451		545
452	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
453	{	547	{
454	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
460		552
461	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
462	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		555
464	static u8 get_features ()	556	static u8 get_features ()
465	{	557	{
466	u8 f = 0;	558	u8 f = 0;
467	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
…		…
475	#endif	567	#endif
476	return f;	568	return f;
477	}	569	}
478	};	570	};
479		571
		572	void
480	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
481	{	574	{
482	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
483	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
484	randsize = RAND_SIZE;
485	hmaclen = HMACLENGTH;
486	flags = 0;	577	flags = 0;
487	challengelen = sizeof (rsachallenge);
488	features = get_features ();	578	features = get_features ();
489		579
		580	strncpy ((char *)serial, conf.serial, sizeof (serial));
		581
490	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
491	digest_nid = htonl (EVP_MD_type (RSA_HASH));
492	hmac_nid = htonl (EVP_MD_type (DIGEST));	583	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		584	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
493		585
494	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
495	set_hdr (type, dst);	587	set_hdr (type, dst);
496	}	588	}
497		589
498	bool config_packet::chk_config () const	590	bool
		591	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
499	{	592	{
500	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
501	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	594	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
502	else if (randsize != RAND_SIZE)	595	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)))	596	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));	597	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
510	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	598	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)))	599	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));	600	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		601	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		602	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		603	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		604	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
514	else	605	else
		606	{
		607	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		608
		609	if (cmp > 0)
		610	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		611	conf->nodename, (const char *)rsi);
		612	else if (cmp == 0)
515	return true;	613	return true;
		614	}
516		615
517	return false;	616	return false;
518	}	617	}
519		618
520	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet // UNPROTECTED
521	{	620	{
522	char magic[8];	621	char magic[8];
523	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
524	u8 protocols; // supported protocols (will be patched on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
525	u8 pad2, pad3;	624	u8 pad2, pad3;
526	rsaid id;	625	auth_encr encr;
527	rsaencrdata encr;
528		626
529	auth_req_packet (int dst, bool initiate_, u8 protocols_)	627	auth_req_packet (int dst, bool initiate_, u8 protocols_)
530	{	628	{
531	config_packet::setup (PT_AUTH_REQ, dst);	629	config_packet::setup (PT_AUTH_REQ, dst);
532	strncpy (magic, MAGIC, 8);	630	memcpy (magic, MAGIC, 8);
533	initiate = !!initiate_;	631	initiate = !!initiate_;
534	protocols = protocols_;	632	protocols = protocols_;
535		633
536	len = sizeof (*this) - sizeof (net_packet);	634	len = sizeof (*this) - sizeof (net_packet);
537	}	635	}
538	};	636	};
539		637
540	struct auth_res_packet : config_packet	638	struct auth_res_packet : vpn_packet // UNPROTECTED
541	{	639	{
542	rsaid id;
543	u8 pad1, pad2, pad3;
544	u8 response_len; // encrypted length
545	rsaresponse response;	640	auth_response response;
546		641
547	auth_res_packet (int dst)	642	auth_res_packet (int dst)
548	{	643	{
549	config_packet::setup (PT_AUTH_RES, dst);	644	set_hdr (PT_AUTH_RES, dst);
550		645
551	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
552	}	647	}
553	};	648	};
554		649
…		…
584	};	679	};
585		680
586	/////////////////////////////////////////////////////////////////////////////	681	/////////////////////////////////////////////////////////////////////////////
587		682
588	void	683	void
589	connection::connection_established ()	684	connection::connection_established (const sockinfo &rsi)
590	{	685	{
591	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	686	if (!have_snd_auth || !have_rcv_auth)
		687	return;
592		688
593	if (ictx && octx)	689	si = rsi;
		690	protocol = rsi.prot;
		691
		692	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		693	conf->nodename, (const char *)rsi,
		694	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		695	PROTOCOL_MAJOR, prot_minor);
		696
		697	if (::conf.script_node_up)
		698	{
		699	run_script_cb *cb = new run_script_cb;
		700	cb->set<connection, &connection::script_node_up> (this);
		701	run_script_queued (cb, _("node-up command execution failed, continuing."));
594	{	702	}
595	connectmode = conf->connectmode;	703
		704	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		705	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
596		706
		707	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		708	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		709
597	// make sure rekeying timeouts are slightly asymmetric	710	// make sure rekeying timeouts are slightly asymmetric
598	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	711	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
599	rekey.start (rekey_interval, rekey_interval);	712	rekey.start (rekey_interval, rekey_interval);
		713
		714	hmac_error = 0.;
		715
600	keepalive.start (::conf.keepalive);	716	keepalive.start (::conf.keepalive);
601		717
602	// send queued packets	718	// send queued packets
603	if (ictx && octx)
604	{
605	while (tap_packet *p = (tap_packet *)data_queue.get ())	719	while (tap_packet *p = (tap_packet *)data_queue.get ())
606	{	720	{
607	send_data_packet (p);	721	if (p->len) send_data_packet (p);
608	delete p;	722	delete p;
609	}	723	}
610		724
611	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	725	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612	{	726	{
613	send_vpn_packet (p, si, IPTOS_RELIABILITY);	727	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
614	delete p;	728	delete p;
615	}
616	}
617	}	729	}
		730
		731	vpn->connection_established (this);
		732	}
		733
		734	void
		735	connection::reset_si ()
		736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
618	else	739	else
619	{	740	{
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);	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
642	protocol = 0;	742	protocol = 0;
643	}	743	}
644		744
645	si.set (conf, protocol);	745	si.set (conf, protocol);
646	}	746	}
…		…
649	const sockinfo &	749	const sockinfo &
650	connection::forward_si (const sockinfo &si) const	750	connection::forward_si (const sockinfo &si) const
651	{	751	{
652	if (!si.valid ())	752	if (!si.valid ())
653	{	753	{
654	connection *r = vpn->find_router ();	754	connection *r = vpn->find_router_for (this);
655		755
656	if (r)	756	if (r)
657	{	757	{
658	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	758	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659	conf->nodename, r->conf->nodename, (const char *)r->si);	759	conf->nodename, r->conf->nodename);
660	return r->si;	760	return r->si;
661	}	761	}
662	else	762	else
663	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	763	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
664	conf->nodename);	764	conf->nodename);
665	}	765	}
666		766
667	return si;	767	return si;
668	}	768	}
669		769
670	void	770	void
671	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	771	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
672	{	772	{
673	if (!vpn->send_vpn_packet (pkt, si, tos))	773	if (!vpn->send_vpn_packet (pkt, si, tos))
674	reset_connection ();	774	reset_connection ("packet send error");
675	}	775	}
676		776
677	void	777	void
678	connection::send_ping (const sockinfo &si, u8 pong)	778	connection::send_ping (const sockinfo &si, u8 pong)
679	{	779	{
680	ping_packet *pkt = new ping_packet;	780	ping_packet *pkt = new ping_packet;
681		781
682	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	782	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		783
		784	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
683	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	785	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684		786
685	delete pkt;	787	delete pkt;
686	}	788	}
687		789
…		…
702	void	804	void
703	connection::send_auth_request (const sockinfo &si, bool initiate)	805	connection::send_auth_request (const sockinfo &si, bool initiate)
704	{	806	{
705	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	807	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
706		808
707	rsachallenge chg;	809	generate_auth_data ();
708	rsa_cache.gen (pkt->id, chg);
709	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
710		811
711	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	812	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	813	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
714		814
715	delete pkt;	815	delete pkt;
716	}	816	}
717		817
718	void	818	void
719	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
720	{	820	{
721	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
722		822
723	pkt->id = id;	823	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		824	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
724		825
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);	826	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	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
732		828
733	delete pkt;	829	delete pkt;
734	}	830	}
735		831
736	void	832	void
737	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738	{	834	{
739	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
740	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
741		838
742	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	839	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
743		840
744	r->hmac_set (octx);	841	r->hmac_set (octx);
745	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
…		…
748	}	845	}
749		846
750	inline void	847	inline void
751	connection::establish_connection_cb (ev::timer &w, int revents)	848	connection::establish_connection_cb (ev::timer &w, int revents)
752	{	849	{
753	if (!ictx	850	if (!(ictx && octx)
754	&& conf != THISNODE	851	&& conf != THISNODE
755	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
756	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
757	&& !w.is_active ())	854	&& !w.is_active ())
758	{	855	{
		856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		857	// and stop trying. should probably be handled by a per-connection expire handler.
		858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ("no demand");
		861	return;
		862	}
		863
		864	last_establish_attempt = ev_now ();
		865
759	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760	? (retry_cnt & 3) + 1	867	? (retry_cnt & 3) + 1
761	: 1 << (retry_cnt >> 2));	868	: 1 << (retry_cnt >> 2));
762		869
763	reset_si ();	870	reset_si ();
764		871
765	bool slow = si.prot & PROT_SLOW;	872	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
766		873
767	if (si.prot && !si.host)	874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
768	{	875	{
769	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770	/*TODO*/ /* start the timer so we don't recurse endlessly */	876	/*TODO*/ /* start the timer so we don't recurse endlessly */
771	w.start (1);	877	w.start (1);
772	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
773	}	879	}
774	else	880	else
775	{	881	{
776	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
777		885
778	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
779		887
780	slow = slow || (dsi.prot & PROT_SLOW);	888	slow = slow || (dsi.prot & PROT_SLOW);
781		889
782	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
783	{	891	{
784	if (retry_cnt < 4)	892	// use ping after the first few retries
		893	// TODO: on rekeys, the other node might not interpret ping correctly,
		894	// TODO: as it will still have a valid connection
		895	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
785	send_auth_request (dsi, true);	896	send_auth_request (dsi, true);
786	else	897	else
787	send_ping (dsi, 0);	898	send_ping (dsi, 0);
788	}	899	}
789	}	900	}
790		901
791	retry_int *= slow ? 8. : 0.7;	902	retry_int *= slow ? 4. : 0.9;
792		903
793	if (retry_int < conf->max_retry)	904	if (retry_int < conf->max_retry)
794	retry_cnt++;	905	retry_cnt++;
795	else	906	else
796	retry_int = conf->max_retry;	907	retry_int = conf->max_retry;
…		…
798	w.start (retry_int);	909	w.start (retry_int);
799	}	910	}
800	}	911	}
801		912
802	void	913	void
803	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
804	{	915	{
805	if (ictx && octx)	916	if (ictx && octx)
806	{	917	{
807	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
809		920
810	if (::conf.script_node_down)	921	if (::conf.script_node_down)
811	{	922	{
812	run_script_cb cb;	923	run_script_cb *cb = new run_script_cb;
813	cb.set<connection, &connection::script_node_down> (this);	924	cb->set<connection, &connection::script_node_down> (this);
814	if (!run_script (cb, false))
815	slog (L_WARN, _("node-down command execution failed, continuing."));	925	run_script_queued (cb, _("node-down command execution failed, continuing."));
816	}	926	}
817	}	927	}
818		928
819	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
820	delete octx; octx = 0;	930	delete octx; octx = 0;
821	#if ENABLE_DNS
822	dnsv4_reset_connection ();
823	#endif
824		931
825	si.host = 0;	932	si.host = 0;
826		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
827	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
828	retry_cnt = 0;	940	retry_cnt = 0;
829		941
830	rekey.stop ();	942	rekey.stop ();
831	keepalive.stop ();	943	keepalive.stop ();
832	establish_connection.stop ();	944	establish_connection.stop ();
…		…
836	connection::shutdown ()	948	connection::shutdown ()
837	{	949	{
838	if (ictx && octx)	950	if (ictx && octx)
839	send_reset (si);	951	send_reset (si);
840		952
841	reset_connection ();	953	reset_connection ("shutdown");
842	}	954	}
843		955
		956	// poor-man's rekeying
844	inline void	957	inline void
845	connection::rekey_cb (ev::timer &w, int revents)	958	connection::rekey_cb (ev::timer &w, int revents)
846	{	959	{
847	reset_connection ();	960	reset_connection ("rekeying");
848	establish_connection ();	961	establish_connection ();
849	}	962	}
850		963
851	void	964	void
852	connection::send_data_packet (tap_packet *pkt)	965	connection::send_data_packet (tap_packet *pkt)
…		…
866	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
867	rekey ();	980	rekey ();
868	}	981	}
869		982
870	void	983	void
		984	connection::post_inject_queue ()
		985	{
		986	// force a connection every now and when when packets are sent (max 1/s)
		987	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		988	establish_connection.stop ();
		989
		990	establish_connection ();
		991	}
		992
		993	void
871	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	994	connection::inject_data_packet (tap_packet *pkt)
872	{	995	{
873	if (ictx && octx)	996	if (ictx && octx)
874	send_data_packet (pkt);	997	send_data_packet (pkt);
875	else	998	else
876	{	999	{
877	if (!broadcast)
878	data_queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
879		1001	post_inject_queue ();
880	establish_connection ();
881	}	1002	}
882	}	1003	}
883		1004
		1005	void
884	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
885	{	1007	{
886	if (ictx && octx)	1008	if (ictx && octx)
887	send_vpn_packet (pkt, si, tos);	1009	send_vpn_packet (pkt, si, tos);
888	else	1010	else
889	{	1011	{
890	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1012	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
891		1013	post_inject_queue ();
892	establish_connection ();
893	}	1014	}
894	}	1015	}
895		1016
896	void	1017	void
897	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
898	{	1019	{
899	last_activity = ev_now ();	1020	last_activity = ev_now ();
900		1021
901	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1022	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
902	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1023	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
903		1024
904	if (connectmode == conf_node::C_DISABLED)	1025	if (connectmode == conf_node::C_DISABLED)
905	return;	1026	return;
906		1027
907	switch (pkt->typ ())	1028	switch (pkt->typ ())
908	{	1029	{
909	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
910	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
911	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
912	// when we receive a ping.	1035	// when we receive a ping.
913	if (!ictx)	1036	if (!ictx)
914	{	1037	{
915	if (auth_rate_limiter.can (rsi))	1038	if (auth_rate_limiter.can (rsi))
916	send_auth_request (rsi, true);	1039	send_auth_request (rsi, true);
917	}	1040	}
918	else	1041	else
		1042	// we would love to change the socket address here, but ping's aren't
		1043	// authenticated, so we best ignore it.
919	send_ping (rsi, 1); // pong	1044	send_ping (rsi, 1); // pong
920		1045
921	break;	1046	break;
922		1047
923	case vpn_packet::PT_PONG:	1048	case vpn_packet::PT_PONG:
		1049	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1050
		1051	// a PONG might mean that the other side doesn't really know
		1052	// about our desire for communication.
		1053	establish_connection ();
924	break;	1054	break;
925		1055
926	case vpn_packet::PT_RESET:	1056	case vpn_packet::PT_RESET:
		1057	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1058
		1059	if (ictx && octx)
927	{	1060	{
928	reset_connection ();	1061	reset_connection ("remote reset");
929		1062
930	config_packet *p = (config_packet *) pkt;	1063	config_packet *p = (config_packet *) pkt;
931		1064
932	if (!p->chk_config ())	1065	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 ();	1066	establish_connection ();
940	}	1067	}
		1068
941	break;	1069	break;
942		1070
943	case vpn_packet::PT_AUTH_REQ:	1071	case vpn_packet::PT_AUTH_REQ:
944	if (auth_rate_limiter.can (rsi))	1072	if (auth_rate_limiter.can (rsi))
945	{	1073	{
946	auth_req_packet *p = (auth_req_packet *) pkt;	1074	auth_req_packet *p = (auth_req_packet *)pkt;
947		1075
948	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1076	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1077	conf->nodename, p->initiate ? "initiate" : "reply",
		1078	p->protocols, p->features);
949		1079
950	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1080	if (memcmp (p->magic, MAGIC, 8))
		1081	{
		1082	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1083	conf->nodename, (const char *)rsi);
		1084	}
		1085	else if (p->chk_config (conf, rsi))
951	{	1086	{
952	if (p->prot_minor != PROTOCOL_MINOR)	1087	if (p->prot_minor != PROTOCOL_MINOR)
953	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1088	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
954	conf->nodename, (const char *)rsi,	1089	conf->nodename, (const char *)rsi,
955	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
956		1091
957	if (p->initiate)	1092	if (p->initiate)
		1093	{
958	send_auth_request (rsi, false);	1094	send_auth_request (rsi, false);
959		1095
960	rsachallenge k;	1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
961		1099
		1100	auth_data auth;
		1101
962	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
963	{	1103	{
964	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1104	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));	1105	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
966	break;
967	}	1106	}
968	else	1107	else
969	{	1108	{
970	delete octx;	1109	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
971		1110
972	octx = new crypto_ctx (k, 1);	1111	rcv_auth = auth;
973	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1112	have_rcv_auth = true;
974		1113
		1114	send_auth_response (rsi);
		1115
		1116	if (chg)
		1117	{
975	conf->protocols = p->protocols;	1118	conf->protocols = p->protocols;
976	features = p->features & config_packet::get_features ();	1119	features = p->features & config_packet::get_features ();
977		1120
978	send_auth_response (rsi, p->id, k);
979
980	connection_established ();	1121	connection_established (rsi);
981
982	break;	1122	}
983	}	1123	}
		1124
		1125	break;
984	}	1126	}
985	else
986	slog (L_WARN, _("%s(%s): protocol mismatch"),
987	conf->nodename, (const char *)rsi);
988		1127
989	send_reset (rsi);	1128	send_reset (rsi);
990	}	1129	}
991		1130
992	break;	1131	break;
993		1132
994	case vpn_packet::PT_AUTH_RES:	1133	case vpn_packet::PT_AUTH_RES:
995	{	1134	{
996	auth_res_packet *p = (auth_res_packet *) pkt;	1135	auth_res_packet *p = (auth_res_packet *)pkt;
997		1136
998	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
999		1138
1000	if (p->chk_config ())	1139	auth_mac local_mac;
		1140	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1141
		1142	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
1001	{	1143	{
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"),	1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1012	conf->nodename, (const char *)rsi);	1145	conf->nodename, (const char *)rsi);
1013	break;
1014	}	1146	}
1015	else	1147	else if (!have_snd_auth)
1016	{	1148	{
1017	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1018		1150
1019	if (!p->hmac_chk (cctx))	1151	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 ();	1152	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	}	1153	}
1067	}	1154	}
1068
1069	send_reset (rsi);
1070	break;	1155	break;
1071		1156
1072	case vpn_packet::PT_DATA_COMPRESSED:	1157	case vpn_packet::PT_DATA_COMPRESSED:
1073	#if !ENABLE_COMPRESSION	1158	#if !ENABLE_COMPRESSION
1074	send_reset (rsi);	1159	send_reset (rsi);
…		…
1080	if (ictx && octx)	1165	if (ictx && octx)
1081	{	1166	{
1082	vpndata_packet *p = (vpndata_packet *)pkt;	1167	vpndata_packet *p = (vpndata_packet *)pkt;
1083		1168
1084	if (!p->hmac_chk (ictx))	1169	if (!p->hmac_chk (ictx))
		1170	{
		1171	// rekeying often creates temporary hmac auth floods
		1172	// we assume they don't take longer than a few seconds normally,
		1173	// and suppress messages and resets during that time.
		1174	//TODO: should be done per source address
		1175	if (!hmac_error)
		1176	{
		1177	hmac_error = ev_now () + 3;
		1178	break;
		1179	}
		1180	else if (hmac_error >= ev_now ())
		1181	break; // silently suppress
		1182	else
		1183	{
1085	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1086	"could be an attack, or just corruption or a synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1087	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
		1187	// reset
		1188	}
		1189	}
1088	else	1190	else
1089	{	1191	{
1090	u32 seqno;	1192	u32 seqno;
1091	tap_packet *d = p->unpack (this, seqno);	1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
1092		1195
1093	if (iseqno.recv_ok (seqno))	1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
1094	{	1199	{
1095	vpn->tap->send (d);	1200	vpn->tap->send (d);
1096		1201
1097	if (si != rsi)	1202	if (si != rsi)
1098	{	1203	{
1099	// fast re-sync on source address changes, useful especially for tcp/ip	1204	// fast re-sync on source address changes, useful especially for tcp/ip
		1205	//if (last_si_change < ev_now () + 5.)
1100	si = rsi;	1206	// {
1101
1102	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1103	conf->nodename, (const char *)si, (const char *)rsi);	1208	conf->nodename, (const char *)si, (const char *)rsi);
		1209
		1210	si = rsi;
		1211
		1212	if (::conf.script_node_change)
		1213	{
		1214	run_script_cb *cb = new run_script_cb;
		1215	cb->set<connection, &connection::script_node_change> (this);
		1216	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1217	}
		1218
		1219	// }
		1220	//else
		1221	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1222	// conf->nodename, (const char *)si, (const char *)rsi);
1104	}	1223	}
		1224	}
		1225	else if (seqclass == 1) // far history
		1226	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1227	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1228	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1229	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1230	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1231	else if (seqclass == 3) // reset
		1232	{
		1233	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1234	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1235	send_reset (rsi);
1105	}	1236	}
1106		1237
1107	delete d;	1238	delete d;
1108	break;	1239	break;
1109	}	1240	}
…		…
1113	break;	1244	break;
1114		1245
1115	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
1116	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1117	{	1248	{
1118	connect_req_packet *p = (connect_req_packet *) pkt;	1249	connect_req_packet *p = (connect_req_packet *)pkt;
1119		1250
1120	if (p->id > 0 && p->id <= vpn->conns.size ())	1251	if (p->id > 0 && p->id <= vpn->conns.size ())
1121	{	1252	{
1122	connection *c = vpn->conns[p->id - 1];	1253	connection *c = vpn->conns[p->id - 1];
1123	conf->protocols = p->protocols;	1254	conf->protocols = p->protocols;
1124		1255
1125	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1256	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1257	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1258	p->protocols,
1126	conf->id, p->id, c->ictx && c->octx);	1259	c->ictx && c->octx);
1127		1260
1128	if (c->ictx && c->octx)	1261	if (c->ictx && c->octx)
1129	{	1262	{
1130	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
1131	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
…		…
1154		1287
1155	c->conf->protocols = p->protocols;	1288	c->conf->protocols = p->protocols;
1156	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1289	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1157	p->si.upgrade_protocol (protocol, c->conf);	1290	p->si.upgrade_protocol (protocol, c->conf);
1158		1291
1159	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1292	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);	1293	conf->nodename,
		1294	vpn->conns[p->id - 1]->conf->nodename,
		1295	(const char *)p->si,
		1296	p->protocols,
		1297	protocol,
		1298	p->si.supported_protocols (c->conf),
		1299	!c->ictx && !c->octx);
1161		1300
1162	const sockinfo &dsi = forward_si (p->si);	1301	const sockinfo &dsi = forward_si (p->si);
1163		1302
1164	if (dsi.valid ())	1303	if (dsi.valid ())
1165	c->send_auth_request (dsi, true);	1304	c->send_auth_request (dsi, true);
		1305	else
		1306	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si);
1166	}	1309	}
1167	else	1310	else
1168	slog (L_WARN,	1311	slog (L_WARN,
1169	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1312	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1170	p->id);	1313	p->id);
…		…
1179	}	1322	}
1180		1323
1181	inline void	1324	inline void
1182	connection::keepalive_cb (ev::timer &w, int revents)	1325	connection::keepalive_cb (ev::timer &w, int revents)
1183	{	1326	{
1184	if (ev_now () >= last_activity + ::conf.keepalive + 30)	1327	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1328
		1329	if (when >= 0)
		1330	w.start (when);
		1331	else if (when < -15)
1185	{	1332	{
1186	reset_connection ();	1333	reset_connection ("keepalive overdue");
1187	establish_connection ();	1334	establish_connection ();
1188	}	1335	}
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	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1192	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1193	{	1338	{
		1339	w.start (3);
1194	send_ping (si);	1340	send_ping (si);
1195	w.start (5);
1196	}	1341	}
1197	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1342	else if (when >= -10)
1198	// hold ondemand connections implicitly a few seconds longer	1343	// hold ondemand connections implicitly a few seconds longer
1199	// should delete octx, though, or something like that ;)	1344	// should delete octx, though, or something like that ;)
1200	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1345	w.start (when + 10);
1201	else	1346	else
1202	reset_connection ();	1347	reset_connection ("keepalive timeout");
1203	}	1348	}
1204		1349
		1350	void
1205	void connection::send_connect_request (int id)	1351	connection::send_connect_request (int id)
1206	{	1352	{
1207	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1353	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1208		1354
1209	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1355	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1356	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1357	THISNODE->protocols);
1210	p->hmac_set (octx);	1358	p->hmac_set (octx);
1211	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1212		1360
1213	delete p;	1361	delete p;
1214	}	1362	}
1215		1363
		1364	void
1216	void connection::script_init_env (const char *ext)	1365	connection::script_init_env (const char *ext)
1217	{	1366	{
1218	char *env;	1367	char *env;
1219	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1368	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1220	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1369	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1221	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1370	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1222	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1371	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1223	conf->id & 0xff); putenv (env);	1372	conf->id & 0xff); putenv (env);
1224	}	1373	}
1225		1374
		1375	void
1226	void connection::script_init_connect_env ()	1376	connection::script_init_connect_env ()
1227	{	1377	{
1228	vpn->script_init_env ();	1378	vpn->script_init_env ();
1229		1379
1230	char *env;	1380	char *env;
1231	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1381	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1382	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1232	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1233	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1234	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1235	}	1386	}
1236		1387
1237	inline const char *	1388	inline const char *
1238	connection::script_node_up ()	1389	connection::script_node_up ()
1239	{	1390	{
…		…
1249		1400
1250	return filename;	1401	return filename;
1251	}	1402	}
1252		1403
1253	inline const char *	1404	inline const char *
		1405	connection::script_node_change ()
		1406	{
		1407	script_init_connect_env ();
		1408
		1409	putenv ((char *)"STATE=change");
		1410
		1411	char *filename;
		1412	asprintf (&filename,
		1413	"%s/%s",
		1414	confbase,
		1415	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1416
		1417	return filename;
		1418	}
		1419
		1420	inline const char *
1254	connection::script_node_down ()	1421	connection::script_node_down ()
1255	{	1422	{
1256	script_init_connect_env ();	1423	script_init_connect_env ();
1257		1424
1258	putenv ((char *)"STATE=down");	1425	putenv ((char *)"STATE=down");
…		…
1265		1432
1266	return filename;	1433	return filename;
1267	}	1434	}
1268		1435
1269	connection::connection (struct vpn *vpn, conf_node *conf)	1436	connection::connection (struct vpn *vpn, conf_node *conf)
1270	: vpn(vpn), conf(conf)	1437	: vpn(vpn), conf(conf),
1271	#if ENABLE_DNS	1438	#if ENABLE_DNS
1272	, dns (0)	1439	dns (0),
1273	#endif	1440	#endif
		1441	data_queue(conf->max_ttl, conf->max_queue + 1),
		1442	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1274	{	1443	{
1275	rekey .set<connection, &connection::rekey_cb > (this);	1444	rekey .set<connection, &connection::rekey_cb > (this);
1276	keepalive .set<connection, &connection::keepalive_cb > (this);	1445	keepalive .set<connection, &connection::keepalive_cb > (this);
1277	establish_connection.set<connection, &connection::establish_connection_cb> (this);	1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1278		1447
		1448	last_establish_attempt = 0.;
1279	octx = ictx = 0;	1449	octx = ictx = 0;
1280	retry_cnt = 0;
1281		1450
1282	if (!conf->protocols) // make sure some protocol is enabled	1451	connectmode = conf->connectmode;
1283	conf->protocols = PROT_UDPv4;
1284		1452
1285	connectmode = conf_node::C_ALWAYS; // initial setting	1453	// queue a dummy packet to force an initial connection attempt
		1454	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1455	vpn_queue.put (new net_packet);
		1456
1286	reset_connection ();	1457	reset_connection ("startup");
1287	}	1458	}
1288		1459
1289	connection::~connection ()	1460	connection::~connection ()
1290	{	1461	{
1291	shutdown ();	1462	shutdown ();
1292	}	1463	}
1293		1464
		1465	void
1294	void connection_init ()	1466	connection_init ()
1295	{	1467	{
1296	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1297	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1298	}	1470	}
1299		1471

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