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Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.98 by root, Tue Jul 16 16:44:36 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	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
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	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
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include "gettext.h"	38	#include <openssl/rand.h>
		39	#include <openssl/evp.h>
		40	#include <openssl/rsa.h>
		41	#include <openssl/err.h>
28		42
29	#include "conf.h"	43	#include "conf.h"
30	#include "slog.h"	44	#include "slog.h"
31	#include "device.h"	45	#include "device.h"
32	#include "protocol.h"	46	#include "vpn.h"
33	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
34		49
35	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
36	# define RAND_pseudo_bytes RAND_bytes
37	#endif
38		51
39	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53
		54	#define ULTRA_FAST 1
		55	#define HLOG 15
		56	#include "lzf/lzf.h"
		57	#include "lzf/lzf_c.c"
		58	#include "lzf/lzf_d.c"
		59
		60	//////////////////////////////////////////////////////////////////////////////
		61
		62	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		63	static ev::child rs_child_ev;
		64
		65	namespace
		66	{
		67	void // c++ requires external linkage here, apparently :(
		68	rs_child_cb (ev::child &w, int revents)
		69	{
		70	w.stop ();
		71
		72	if (rs_queue.empty ())
		73	return;
		74
		75	pid_t pid = run_script (*rs_queue.front ().first, false);
		76	if (pid)
		77	{
		78	w.set (pid);
		79	w.start ();
		80	}
		81	else
		82	slog (L_WARN, rs_queue.front ().second);
		83
		84	delete rs_queue.front ().first;
		85	rs_queue.pop ();
		86	}
		87	};
		88
		89	// despite the fancy name, this is quite a hack
		90	static void
		91	run_script_queued (run_script_cb *cb, const char *warnmsg)
		92	{
		93	rs_queue.push (std::make_pair (cb, warnmsg));
		94
		95	if (!rs_child_ev.is_active ())
		96	{
		97	rs_child_ev.set<rs_child_cb> ();
		98	rs_child_ev ();
		99	}
		100	}
		101
		102	//////////////////////////////////////////////////////////////////////////////
40		103
41	struct crypto_ctx	104	struct crypto_ctx
42	{	105	{
43	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
44	HMAC_CTX hctx;	107	HMAC_CTX hctx;
45		108
46	crypto_ctx (const rsachallenge &challenge, int enc);	109	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
47	~crypto_ctx ();	110	~crypto_ctx ();
48	};	111	};
49		112
50	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	113	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
51	{	114	{
		115	ecdh_key s;
		116
		117	curve25519_combine (a, b, s);
		118
		119	{
		120	u8 mac_key[MAC_KEYSIZE];
		121	static const unsigned char mac_info[] = "gvpe mac key";
		122
		123	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt));
		124	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done ();
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		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));
		139	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done ();
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
52	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
53	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
54	HMAC_CTX_init (&hctx);	147	}
55	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
56	}	148	}
57		149
58	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
59	{	151	{
60	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
61	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
62	}	154	}
63		155
		156	static inline void
		157	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		158	{
		159	if (RSA_public_encrypt (sizeof (auth.rsa),
		160	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		161	key, RSA_PKCS1_OAEP_PADDING) < 0)
		162	fatal ("RSA_public_encrypt error");
		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
		177	return 1;
		178	}
		179
64	static void	180	static void
65	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	181	auth_hash (const auth_data &auth, auth_mac &mac)
66	{	182	{
67	EVP_MD_CTX ctx;	183	HMAC_CTX ctx;
68		184
69	EVP_MD_CTX_init (&ctx);	185	HMAC_CTX_init (&ctx);
70	EVP_DigestInit (&ctx, RSA_HASH);	186	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
71	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	187	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
72	EVP_DigestUpdate(&ctx, &id, sizeof id);	188	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
73	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
74	EVP_MD_CTX_cleanup (&ctx);	189	HMAC_CTX_cleanup (&ctx);
75	}	190	}
76		191
77	struct rsa_entry {	192	void
78	tstamp expire;	193	connection::generate_auth_data ()
79	rsaid id;
80	rsachallenge chg;
81	};
82
83	struct rsa_cache : list<rsa_entry>
84	{	194	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	195	if (auth_expire < ev_now ())
86
87	bool find (const rsaid &id, rsachallenge &chg)
88	{
89	for (iterator i = begin (); i != end (); ++i)
90	{
91	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
92	{
93	memcpy (&chg, &i->chg, sizeof chg);
94
95	erase (i);
96	return true;
97	}
98	}
99
100	if (cleaner.at < NOW)
101	cleaner.start (NOW + RSA_TTL);
102
103	return false;
104	}
105
106	void gen (rsaid &id, rsachallenge &chg)
107	{
108	rsa_entry e;
109
110	RAND_bytes ((unsigned char *)&id, sizeof id);
111	RAND_bytes ((unsigned char *)&chg, sizeof chg);
112
113	e.expire = NOW + RSA_TTL;
114	e.id = id;
115	memcpy (&e.chg, &chg, sizeof chg);
116
117	push_back (e);
118
119	if (cleaner.at < NOW)
120	cleaner.start (NOW + RSA_TTL);
121	}
122
123	rsa_cache ()
124	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	196	{
		197	// request data
		198	RAND_pseudo_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		199	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		200	auth_hash (snd_auth, snd_auth_mac);
126		201
127	} rsa_cache;	202	// eventual response data
128		203	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
129	void rsa_cache::cleaner_cb (tstamp &ts)
130	{
131	if (empty ())
132	ts = TSTAMP_CANCEL;
133	else
134	{	204	}
135	ts = NOW + RSA_TTL;
136		205
137	for (iterator i = begin (); i != end (); )	206	// every use prolongs the expiry
138	if (i->expire <= NOW)	207	auth_expire = ev_now () + AUTH_TTL;
139	i = erase (i);
140	else
141	++i;
142	}
143	}	208	}
144		209
145	//////////////////////////////////////////////////////////////////////////////	210	//////////////////////////////////////////////////////////////////////////////
146		211
147	void pkt_queue::put (tap_packet *p)	212	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		213	: max_ttl (max_ttl), max_queue (max_queue)
148	{	214	{
149	if (queue[i])	215	queue = new pkt [max_queue];
150	{
151	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;
153	}
154		216
155	queue[i] = p;
156
157	i = (i + 1) % QUEUEDEPTH;
158	}
159
160	tap_packet *pkt_queue::get ()
161	{
162	tap_packet *p = queue[j];
163
164	if (p)
165	{
166	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;
168	}
169
170	return p;
171	}
172
173	pkt_queue::pkt_queue ()
174	{
175	memset (queue, 0, sizeof (queue));
176	i = 0;	217	i = 0;
177	j = 0;	218	j = 0;
		219
		220	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
178	}	221	}
179		222
180	pkt_queue::~pkt_queue ()	223	pkt_queue::~pkt_queue ()
181	{	224	{
182	for (i = QUEUEDEPTH; --i > 0; )	225	while (net_packet *p = get ())
		226	delete p;
		227
183	delete queue[i];	228	delete [] queue;
184	}	229	}
185		230
		231	void
		232	pkt_queue::expire_cb (ev::timer &w, int revents)
		233	{
		234	ev_tstamp expire = ev_now () - max_ttl;
		235
		236	for (;;)
		237	{
		238	if (empty ())
		239	break;
		240
		241	double diff = queue[j].tstamp - expire;
		242
		243	if (diff >= 0.)
		244	{
		245	w.start (diff > 0.5 ? diff : 0.5);
		246	break;
		247	}
		248
		249	delete get ();
		250	}
		251	}
		252
		253	void
		254	pkt_queue::put (net_packet *p)
		255	{
		256	ev_tstamp now = ev_now ();
		257
		258	// start expiry timer
		259	if (empty ())
		260	expire.start (max_ttl);
		261
		262	int ni = i + 1 == max_queue ? 0 : i + 1;
		263
		264	if (ni == j)
		265	delete get ();
		266
		267	queue[i].pkt = p;
		268	queue[i].tstamp = now;
		269
		270	i = ni;
		271	}
		272
		273	net_packet *
		274	pkt_queue::get ()
		275	{
		276	if (empty ())
		277	return 0;
		278
		279	net_packet *p = queue[j].pkt;
		280	queue[j].pkt = 0;
		281
		282	j = j + 1 == max_queue ? 0 : j + 1;
		283
		284	return p;
		285	}
		286
186	struct net_rateinfo {	287	struct net_rateinfo
		288	{
187	u32 host;	289	u32 host;
188	double pcnt, diff;	290	double pcnt, diff;
189	tstamp last;	291	tstamp last;
190	};	292	};
191		293
192	// only do action once every x seconds per host whole allowing bursts.	294	// only do action once every x seconds per host whole allowing bursts.
193	// this implementation ("splay list" ;) is inefficient,	295	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	296	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	297	struct net_rate_limiter : list<net_rateinfo>
196	{	298	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	299	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	300	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
199	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	301	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		302	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
200		303
201	bool can (const sockinfo &si) { return can((u32)si.host); }	304	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	305	bool can (u32 host);
203	};	306	};
204		307
205	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	308	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206		309
		310	bool
207	bool net_rate_limiter::can (u32 host)	311	net_rate_limiter::can (u32 host)
208	{	312	{
209	iterator i;	313	iterator i;
210		314
211	for (i = begin (); i != end (); )	315	for (i = begin (); i != end (); )
212	if (i->host == host)	316	if (i->host == host)
213	break;	317	break;
214	else if (i->last < NOW - EXPIRE)	318	else if (i->last < ev_now () - NRL_EXPIRE)
215	i = erase (i);	319	i = erase (i);
216	else	320	else
217	i++;	321	i++;
218		322
219	if (i == end ())	323	if (i == end ())
220	{	324	{
221	net_rateinfo ri;	325	net_rateinfo ri;
222		326
223	ri.host = host;	327	ri.host = host;
224	ri.pcnt = 1.;	328	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	329	ri.diff = NRL_MAXDIF;
226	ri.last = NOW;	330	ri.last = ev_now ();
227		331
228	push_front (ri);	332	push_front (ri);
229		333
230	return true;	334	return true;
231	}	335	}
232	else	336	else
233	{	337	{
234	net_rateinfo ri (*i);	338	net_rateinfo ri (*i);
235	erase (i);	339	erase (i);
236		340
237	ri.pcnt = ri.pcnt * ALPHA;	341	ri.pcnt = ri.pcnt * NRL_ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	342	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
239		343
240	ri.last = NOW;	344	ri.last = ev_now ();
241		345
		346	double dif = ri.diff / ri.pcnt;
		347
242	bool send = ri.diff / ri.pcnt > CUTOFF;	348	bool send = dif > NRL_CUTOFF;
243		349
		350	if (dif > NRL_MAXDIF)
		351	{
		352	ri.pcnt = 1.;
		353	ri.diff = NRL_MAXDIF;
		354	}
244	if (send)	355	else if (send)
245	ri.pcnt++;	356	ri.pcnt++;
246		357
247	push_front (ri);	358	push_front (ri);
248		359
249	return send;	360	return send;
…		…
252		363
253	/////////////////////////////////////////////////////////////////////////////	364	/////////////////////////////////////////////////////////////////////////////
254		365
255	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	366	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
256		367
		368	void
257	void hmac_packet::hmac_gen (crypto_ctx *ctx)	369	hmac_packet::hmac_gen (crypto_ctx *ctx)
258	{	370	{
259	unsigned int xlen;	371	unsigned int xlen;
260		372
261	HMAC_CTX *hctx = &ctx->hctx;	373	HMAC_CTX *hctx = &ctx->hctx;
262		374
263	HMAC_Init_ex (hctx, 0, 0, 0, 0);	375	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
264	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	376	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
265	len - sizeof (hmac_packet));	377	len - sizeof (hmac_packet)));
266	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	378	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
267	}	379	}
268		380
269	void	381	void
270	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
271	{	383	{
…		…
280	hmac_gen (ctx);	392	hmac_gen (ctx);
281		393
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	395	}
284		396
		397	void
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	399	{
287	this->type = type;	400	type = type_;
288		401
289	int src = THISNODE->id;	402	int src = THISNODE->id;
290		403
291	src1 = src;	404	src1 = src;
292	srcdst = ((src >> 8) << 4) | (dst >> 8);	405	srcdst = ((src >> 8) << 4) | (dst >> 8);
…		…
294	}	407	}
295		408
296	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
297	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
298		411
299	struct vpndata_packet:vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
300	{	421	{
301	u8 data[MAXVPNDATA + DATAHDR]; // seqno
302
303	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
304	tap_packet *unpack (connection *conn, u32 &seqno);
305	private:
306
307	const u32 data_hdr_size () const
308	{
309	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
310	}
311	};	423	}
		424	};
312		425
313	void	426	void
314	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
315	{	428	{
316	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
317	int outl = 0, outl2;	430	int outl = 0, outl2;
318	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
319		432
320	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
321	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
322	u32 cl;
323		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
324	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
325	if (cl)	440	if (cl)
326	{	441	{
327	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
328	d = cdata;	443	d = cdata;
329	l = cl + 2;	444	l = cl + 2;
330		445
331	d[0] = cl >> 8;	446	d[0] = cl >> 8;
332	d[1] = cl;	447	d[1] = cl;
		448	}
333	}	449	}
334	#endif	450	#endif
335		451
336	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
337		453
338	struct {	454	struct {
339	#if RAND_SIZE	455	#if RAND_SIZE
340	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
341	#endif	457	#endif
…		…
345	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
346	#if RAND_SIZE	462	#if RAND_SIZE
347	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
348	#endif	464	#endif
349		465
350	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
351	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
352	(unsigned char *) &datahdr, DATAHDR);	468	(unsigned char *) &datahdr, DATAHDR));
353	outl += outl2;	469	outl += outl2;
354		470
355	EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	472	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) d, l);	473	(unsigned char *) d, l));
358	outl += outl2;	474	outl += outl2;
359		475
360	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	476	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
361	outl += outl2;	477	outl += outl2;
362		478
363	len = outl + data_hdr_size ();	479	len = outl + data_hdr_size ();
364		480
365	set_hdr (type, dst);	481	set_hdr (type, dst);
…		…
374	int outl = 0, outl2;	490	int outl = 0, outl2;
375	tap_packet *p = new tap_packet;	491	tap_packet *p = new tap_packet;
376	u8 *d;	492	u8 *d;
377	u32 l = len - data_hdr_size ();	493	u32 l = len - data_hdr_size ();
378		494
379	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	495	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
380		496
381	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
382	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
383		499
384	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
…		…
386	else	502	else
387	#endif	503	#endif
388	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6 - DATAHDR];
389		505
390	/* this overwrites part of the src mac, but we fix that later */	506	/* this overwrites part of the src mac, but we fix that later */
391	EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
392	d, &outl2,	508	d, &outl2,
393	(unsigned char *)&data, len - data_hdr_size ());	509	(unsigned char *)&data, len - data_hdr_size ()));
394	outl += outl2;	510	outl += outl2;
395		511
396	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	512	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
397	outl += outl2;	513	outl += outl2;
398		514
399	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	515	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
400		516
401	id2mac (dst () ? dst() : THISNODE->id, p->dst);	517	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
426	}	542	}
427	};	543	};
428		544
429	struct config_packet : vpn_packet	545	struct config_packet : vpn_packet
430	{	546	{
431	// actually, hmaclen cannot be checked because the hmac
432	// field comes before this data, so peers with other
433	// hmacs simply will not work.
434	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
435	u8 flags, challengelen, pad2, pad3;	548	u8 flags, features, pad6, pad7, pad8;
436	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
437
438	const u8 curflags () const
439	{
440	return 0x80
441	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
442	}
443		550
444	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
445	bool chk_config () const;	552	bool chk_config () const;
		553
		554	static u8 get_features ()
		555	{
		556	u8 f = 0;
		557	#if ENABLE_COMPRESSION
		558	f |= FEATURE_COMPRESSION;
		559	#endif
		560	#if ENABLE_ROHC
		561	f |= FEATURE_ROHC;
		562	#endif
		563	#if ENABLE_BRIDGING
		564	f |= FEATURE_BRIDGING;
		565	#endif
		566	return f;
		567	}
446	};	568	};
447		569
		570	void
448	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
449	{	572	{
450	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
451	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
452	randsize = RAND_SIZE;	575	randsize = RAND_SIZE;
453	hmaclen = HMACLENGTH;	576	flags = 0;
454	flags = curflags ();	577	features = get_features ();
455	challengelen = sizeof (rsachallenge);
456		578
457	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	579	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
458	digest_nid = htonl (EVP_MD_type (RSA_HASH));
459	hmac_nid = htonl (EVP_MD_type (DIGEST));	580	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		581	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
460		582
461	len = sizeof (*this) - sizeof (net_packet);	583	len = sizeof (*this) - sizeof (net_packet);
462	set_hdr (type, dst);	584	set_hdr (type, dst);
463	}	585	}
464		586
		587	bool
465	bool config_packet::chk_config () const	588	config_packet::chk_config () const
466	{	589	{
467	return prot_major == PROTOCOL_MAJOR	590	if (prot_major != PROTOCOL_MAJOR)
468	&& randsize == RAND_SIZE	591	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
469	&& hmaclen == HMACLENGTH	592	else if (randsize != RAND_SIZE)
470	&& flags == curflags ()	593	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
471	&& challengelen == sizeof (rsachallenge)
472	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
473	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	595	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
474	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	596	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
475	}	597	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		598	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		599	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		600	else
		601	return true;
476		602
		603	return false;
		604	}
		605
477	struct auth_req_packet : config_packet	606	struct auth_req_packet : config_packet // UNPROTECTED
478	{	607	{
479	char magic[8];	608	char magic[8];
480	u8 initiate; // false if this is just an automatic reply	609	u8 initiate; // false if this is just an automatic reply
481	u8 protocols; // supported protocols (will get patches on forward)	610	u8 protocols; // supported protocols (will be patched on forward)
482	u8 pad2, pad3;	611	u8 pad2, pad3;
483	rsaid id;	612	auth_encr encr;
484	rsaencrdata encr;
485		613
486	auth_req_packet (int dst, bool initiate_, u8 protocols_)	614	auth_req_packet (int dst, bool initiate_, u8 protocols_)
487	{	615	{
488	config_packet::setup (PT_AUTH_REQ, dst);	616	config_packet::setup (PT_AUTH_REQ, dst);
489	strncpy (magic, MAGIC, 8);	617	memcpy (magic, MAGIC, 8);
490	initiate = !!initiate_;	618	initiate = !!initiate_;
491	protocols = protocols_;	619	protocols = protocols_;
492		620
493	len = sizeof (*this) - sizeof (net_packet);	621	len = sizeof (*this) - sizeof (net_packet);
494	}	622	}
495	};	623	};
496		624
497	struct auth_res_packet : config_packet	625	struct auth_res_packet : config_packet // UNPROTECTED
498	{	626	{
499	rsaid id;
500	u8 pad1, pad2, pad3;
501	u8 response_len; // encrypted length
502	rsaresponse response;	627	auth_response response;
503		628
504	auth_res_packet (int dst)	629	auth_res_packet (int dst)
505	{	630	{
506	config_packet::setup (PT_AUTH_RES, dst);	631	config_packet::setup (PT_AUTH_RES, dst);
507		632
…		…
541	};	666	};
542		667
543	/////////////////////////////////////////////////////////////////////////////	668	/////////////////////////////////////////////////////////////////////////////
544		669
545	void	670	void
		671	connection::connection_established (const sockinfo &rsi)
		672	{
		673	if (!have_snd_auth || !have_rcv_auth)
		674	return;
		675
		676	si = rsi;
		677	protocol = rsi.prot;
		678
		679	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		680	conf->nodename, (const char *)rsi,
		681	is_direct ? "direct" : "forwarded",
		682	PROTOCOL_MAJOR, prot_minor);
		683
		684	if (::conf.script_node_up)
		685	{
		686	run_script_cb *cb = new run_script_cb;
		687	cb->set<connection, &connection::script_node_up> (this);
		688	run_script_queued (cb, _("node-up command execution failed, continuing."));
		689	}
		690
		691	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		692	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		693
		694	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		695	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		696
		697	if (ictx && octx)
		698	{
		699	// make sure rekeying timeouts are slightly asymmetric
		700	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		701	rekey.start (rekey_interval, rekey_interval);
		702
		703	keepalive.start (::conf.keepalive);
		704
		705	// send queued packets
		706	if (ictx && octx)
		707	{
		708	while (tap_packet *p = (tap_packet *)data_queue.get ())
		709	{
		710	if (p->len) send_data_packet (p);
		711	delete p;
		712	}
		713
		714	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		715	{
		716	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		717	delete p;
		718	}
		719	}
		720
		721	vpn->connection_established (this);
		722	}
		723	#if 0
		724	else
		725	{
		726	retry_cnt = 0;
		727	establish_connection.start (5);
		728	keepalive.stop ();
		729	rekey.stop ();
		730	}
		731	#endif
		732	}
		733
		734	void
546	connection::reset_dstaddr ()	735	connection::reset_si ()
547	{	736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		739	else
		740	{
		741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		742	protocol = 0;
		743	}
		744
548	si.set (conf);	745	si.set (conf, protocol);
		746
		747	is_direct = si.valid ();
		748	}
		749
		750	// ensure sockinfo is valid, forward if necessary
		751	const sockinfo &
		752	connection::forward_si (const sockinfo &si) const
		753	{
		754	if (!si.valid ())
		755	{
		756	connection *r = vpn->find_router_for (this);
		757
		758	if (r)
		759	{
		760	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		761	conf->nodename, r->conf->nodename);
		762	return r->si;
		763	}
		764	else
		765	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		766	conf->nodename);
		767	}
		768
		769	return si;
		770	}
		771
		772	void
		773	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		774	{
		775	if (!vpn->send_vpn_packet (pkt, si, tos))
		776	reset_connection ();
549	}	777	}
550		778
551	void	779	void
552	connection::send_ping (const sockinfo &si, u8 pong)	780	connection::send_ping (const sockinfo &si, u8 pong)
553	{	781	{
554	ping_packet *pkt = new ping_packet;	782	ping_packet *pkt = new ping_packet;
555		783
556	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	784	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		785
		786	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
557	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	787	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
558		788
559	delete pkt;	789	delete pkt;
560	}	790	}
561		791
…		…
576	void	806	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	807	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	808	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	809	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580		810
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);	811	generate_auth_data ();
		812	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
582		813
583	rsachallenge chg;
584
585	rsa_cache.gen (pkt->id, chg);
586
587	if (0 > RSA_public_encrypt (sizeof chg,
588	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");
591
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
593		816
		817	delete pkt;
		818	}
		819
		820	void
		821	connection::send_auth_response (const sockinfo &si)
		822	{
		823	auth_res_packet *pkt = new auth_res_packet (conf->id);
		824
		825	auth_hash (rcv_auth, pkt->response.mac);
		826	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
		827
		828	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
595		830
596	delete pkt;	831	delete pkt;
597	}	832	}
598		833
599	void	834	void
600	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
601	{
602	auth_res_packet *pkt = new auth_res_packet (conf->id);
603
604	pkt->id = id;
605
606	rsa_hash (id, chg, pkt->response);
607
608	pkt->hmac_set (octx);
609
610	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
611
612	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
613
614	delete pkt;
615	}
616
617	void
618	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
619	{	836	{
620	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
621	conf->id, rid, (const char *)rsi);	838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
622		840
623	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
624		842
625	r->hmac_set (octx);	843	r->hmac_set (octx);
626	send_vpn_packet (r, si);	844	send_vpn_packet (r, si);
627		845
628	delete r;	846	delete r;
629	}	847	}
630		848
631	void	849	inline void
632	connection::establish_connection_cb (tstamp &ts)	850	connection::establish_connection_cb (ev::timer &w, int revents)
633	{	851	{
634	if (ictx || conf == THISNODE	852	if (!(ictx && octx)
		853	&& conf != THISNODE
635	|| connectmode == conf_node::C_NEVER	854	&& connectmode != conf_node::C_NEVER
636	|| connectmode == conf_node::C_DISABLED)	855	&& connectmode != conf_node::C_DISABLED
637	ts = TSTAMP_CANCEL;	856	&& !w.is_active ())
638	else if (ts <= NOW)
639	{	857	{
640	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
641		859	// and stop trying. should probably be handled by a per-connection expire handler.
642	if (retry_int < 3600 * 8)	860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
643	retry_cnt++;
644
645	ts = NOW + retry_int;
646
647	if (conf->hostname)
648	{	861	{
649	reset_dstaddr ();	862	reset_connection ();
650	if (si.host && auth_rate_limiter.can (si))	863	return;
651	{
652	if (retry_cnt < 4)
653	send_auth_request (si, true);
654	else
655	send_ping (si, 0);
656	}	864	}
		865
		866	last_establish_attempt = ev_now ();
		867
		868	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		869	? (retry_cnt & 3) + 1
		870	: 1 << (retry_cnt >> 2));
		871
		872	reset_si ();
		873
		874	bool slow = si.prot & PROT_SLOW;
		875
		876	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		877	{
		878	/*TODO*/ /* start the timer so we don't recurse endlessly */
		879	w.start (1);
		880	vpn->send_connect_request (this);
657	}	881	}
658	else	882	else
659	vpn->connect_request (conf->id);	883	{
		884	if (si.valid ())
		885	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		886	conf->nodename, (const char *)si);
		887
		888	const sockinfo &dsi = forward_si (si);
		889
		890	slow = slow || (dsi.prot & PROT_SLOW);
		891
		892	if (dsi.valid () && auth_rate_limiter.can (dsi))
		893	{
		894	if (retry_cnt < 4)
		895	send_auth_request (dsi, true);
		896	else
		897	send_ping (dsi, 0);
		898	}
		899	}
		900
		901	retry_int *= slow ? 8. : 0.9;
		902
		903	if (retry_int < conf->max_retry)
		904	retry_cnt++;
		905	else
		906	retry_int = conf->max_retry;
		907
		908	w.start (retry_int);
660	}	909	}
661	}	910	}
662		911
663	void	912	void
664	connection::reset_connection ()	913	connection::reset_connection ()
…		…
667	{	916	{
668	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
669	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
670		919
671	if (::conf.script_node_down)	920	if (::conf.script_node_down)
672	run_script (run_script_cb (this, &connection::script_node_down), false);	921	{
		922	run_script_cb *cb = new run_script_cb;
		923	cb->set<connection, &connection::script_node_down> (this);
		924	run_script_queued (cb, _("node-down command execution failed, continuing."));
		925	}
673	}	926	}
674		927
675	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
676	delete octx; octx = 0;	929	delete octx; octx = 0;
677		930
678	si.host= 0;	931	si.host = 0;
679		932
		933	have_snd_auth = false;
		934	have_rcv_auth = false;
		935	auth_expire = 0.;
		936
680	last_activity = 0;	937	last_activity = 0.;
		938	//last_si_change = 0.;
681	retry_cnt = 0;	939	retry_cnt = 0;
682		940
683	rekey.reset ();	941	rekey.stop ();
684	keepalive.reset ();	942	keepalive.stop ();
685	establish_connection.reset ();	943	establish_connection.stop ();
686	}	944	}
687		945
688	void	946	void
689	connection::shutdown ()	947	connection::shutdown ()
690	{	948	{
…		…
692	send_reset (si);	950	send_reset (si);
693		951
694	reset_connection ();	952	reset_connection ();
695	}	953	}
696		954
697	void	955	// poor-man's rekeying
698	connection::rekey_cb (tstamp &ts)	956	inline void
		957	connection::rekey_cb (ev::timer &w, int revents)
699	{	958	{
700	ts = TSTAMP_CANCEL;
701
702	reset_connection ();	959	reset_connection ();
703	establish_connection ();	960	establish_connection ();
704	}	961	}
705		962
706	void	963	void
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	964	connection::send_data_packet (tap_packet *pkt)
708	{	965	{
709	vpndata_packet *p = new vpndata_packet;	966	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	967	int tos = 0;
711		968
712	if (conf->inherit_tos	969	// I am not hilarious about peeking into packets, but so be it.
713	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	970	if (conf->inherit_tos && pkt->is_ipv4 ())
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	971	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		972
717	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	973	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
718	send_vpn_packet (p, si, tos);	974	send_vpn_packet (p, si, tos);
719		975
720	delete p;	976	delete p;
721		977
722	if (oseqno > MAX_SEQNO)	978	if (oseqno > MAX_SEQNO)
723	rekey ();	979	rekey ();
724	}	980	}
725		981
726	void	982	void
		983	connection::post_inject_queue ()
		984	{
		985	// force a connection every now and when when packets are sent (max 1/s)
		986	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		987	establish_connection.stop ();
		988
		989	establish_connection ();
		990	}
		991
		992	void
727	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	993	connection::inject_data_packet (tap_packet *pkt)
728	{	994	{
729	if (ictx && octx)	995	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	996	send_data_packet (pkt);
731	else	997	else
732	{	998	{
733	if (!broadcast)//DDDD
734	queue.put (new tap_packet (*pkt));	999	data_queue.put (new tap_packet (*pkt));
		1000	post_inject_queue ();
		1001	}
		1002	}
735		1003
736	establish_connection ();	1004	void
		1005	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1006	{
		1007	if (ictx && octx)
		1008	send_vpn_packet (pkt, si, tos);
		1009	else
		1010	{
		1011	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1012	post_inject_queue ();
737	}	1013	}
738	}	1014	}
739		1015
740	void	1016	void
741	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1017	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
742	{	1018	{
743	last_activity = NOW;	1019	last_activity = ev_now ();
744		1020
745	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1021	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1022	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1023
		1024	if (connectmode == conf_node::C_DISABLED)
		1025	return;
747		1026
748	switch (pkt->typ ())	1027	switch (pkt->typ ())
749	{	1028	{
750	case vpn_packet::PT_PING:	1029	case vpn_packet::PT_PING:
		1030	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1031
751	// we send pings instead of auth packets after some retries,	1032	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	1033	// so reset the retry counter and establish a connection
753	// when we receive a ping.	1034	// when we receive a ping.
754	if (!ictx)	1035	if (!ictx)
		1036	{
		1037	if (auth_rate_limiter.can (rsi))
		1038	send_auth_request (rsi, true);
		1039	}
		1040	else
		1041	// we would love to change the socket address here, but ping's aren't
		1042	// authenticated, so we best ignore it.
		1043	send_ping (rsi, 1); // pong
		1044
		1045	break;
		1046
		1047	case vpn_packet::PT_PONG:
		1048	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1049
		1050	// a PONG might mean that the other side doesn't really know
		1051	// about our desire for communication.
		1052	establish_connection ();
		1053	break;
		1054
		1055	case vpn_packet::PT_RESET:
755	{	1056	{
756	if (auth_rate_limiter.can (rsi))	1057	reset_connection ();
757	send_auth_request (rsi, true);	1058
		1059	config_packet *p = (config_packet *) pkt;
		1060
		1061	if (!p->chk_config ())
		1062	{
		1063	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
		1064	conf->nodename, (const char *)rsi);
		1065	connectmode = conf_node::C_DISABLED;
		1066	}
		1067	else if (connectmode == conf_node::C_ALWAYS)
		1068	establish_connection ();
758	}	1069	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	1070	break;
763		1071
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	1072	case vpn_packet::PT_AUTH_REQ:
768	{	1073	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet *p = (config_packet *) pkt;
772
773	if (!p->chk_config ())
774	{	1074	{
		1075	auth_req_packet *p = (auth_req_packet *)pkt;
		1076
		1077	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1078	conf->nodename, p->initiate ? "initiate" : "reply",
		1079	p->protocols, p->features);
		1080
		1081	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
		1082	{
		1083	if (p->prot_minor != PROTOCOL_MINOR)
		1084	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1085	conf->nodename, (const char *)rsi,
		1086	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1087
		1088	if (p->initiate)
		1089	send_auth_request (rsi, false);
		1090
		1091	auth_data auth;
		1092
		1093	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1094	{
		1095	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		1096	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1097	}
		1098	else
		1099	{
		1100	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
		1101
		1102	rcv_auth = auth;
		1103	have_rcv_auth = true;
		1104
		1105	send_auth_response (rsi);
		1106
		1107	if (chg)
		1108	{
		1109	conf->protocols = p->protocols;
		1110	features = p->features & config_packet::get_features ();
		1111
		1112	connection_established (rsi);
		1113	}
		1114	}
		1115
		1116	break;
		1117	}
		1118	else
775	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1119	slog (L_WARN, _("%s(%s): protocol mismatch."),
776	conf->nodename, (const char *)rsi);	1120	conf->nodename, (const char *)rsi);
777	connectmode = conf_node::C_DISABLED;	1121
		1122	send_reset (rsi);
778	}	1123	}
779	else if (connectmode == conf_node::C_ALWAYS)	1124
780	establish_connection ();
781	}
782	break;	1125	break;
783		1126
784	case vpn_packet::PT_AUTH_REQ:	1127	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	1128	{
787	auth_req_packet *p = (auth_req_packet *) pkt;	1129	auth_res_packet *p = (auth_res_packet *)pkt;
788		1130
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1131	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
790		1132
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1133	if (p->chk_config ())
792	{	1134	{
793	if (p->prot_minor != PROTOCOL_MINOR)	1135	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
794	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
795	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;
802
803	if (0 > RSA_private_decrypt (sizeof (p->encr),
804	(unsigned char *)&p->encr, (unsigned char *)&k,
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);
808	else
809	{	1136	{
810	retry_cnt = 0;	1137	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
811	establish_connection.set (NOW + 8); //? ;)	1138	conf->nodename, (const char *)rsi);
812	keepalive.reset ();
813	rekey.reset ();
814
815	delete ictx;
816	ictx = 0;
817
818	delete octx;
819
820	octx = new crypto_ctx (k, 1);
821	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
822
823	conf->protocols = p->protocols;
824	send_auth_response (rsi, p->id, k);
825
826	break;
827	}	1139	}
		1140	else if (!have_snd_auth)
		1141	{
		1142	if (p->prot_minor != PROTOCOL_MINOR)
		1143	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1144	conf->nodename, (const char *)rsi,
		1145	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1146
		1147	prot_minor = p->prot_minor;
		1148	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1149
		1150	have_snd_auth = true;
		1151	connection_established (rsi);
		1152	}
		1153
		1154	break;
828	}	1155	}
829
830	send_reset (rsi);
831	}	1156	}
832		1157
		1158	send_reset (rsi);
833	break;	1159	break;
834		1160
835	case vpn_packet::PT_AUTH_RES:	1161	case vpn_packet::PT_DATA_COMPRESSED:
836	{	1162	#if !ENABLE_COMPRESSION
837	auth_res_packet *p = (auth_res_packet *) pkt;	1163	send_reset (rsi);
		1164	break;
		1165	#endif
838		1166
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1167	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1168
841	if (p->chk_config ())	1169	if (ictx && octx)
842	{	1170	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1171	vpndata_packet *p = (vpndata_packet *)pkt;
844	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
845	conf->nodename, (const char *)rsi,
846	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
847		1172
848	rsachallenge chg;	1173	if (!p->hmac_chk (ictx))
849		1174	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1175	"could be an attack, or just corruption or a synchronization error."),
851	slog (L_ERR, _("%s(%s): unrequested auth response"),
852	conf->nodename, (const char *)rsi);	1176	conf->nodename, (const char *)rsi);
853	else	1177	else
854	{	1178	{
855	crypto_ctx *cctx = new crypto_ctx (chg, 0);
856
857	if (!p->hmac_chk (cctx))
858	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
859	"could be an attack, or just corruption or an synchronization error"),
860	conf->nodename, (const char *)rsi);
861	else	1179	u32 seqno;
		1180	tap_packet *d = p->unpack (this, seqno);
		1181	int seqclass = iseqno.seqno_classify (seqno);
		1182
		1183	if (seqclass == 0) // ok
862	{	1184	{
863	rsaresponse h;	1185	vpn->tap->send (d);
864		1186
865	rsa_hash (p->id, chg, h);	1187	if (si != rsi)
866
867	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
868	{	1188	{
869	prot_minor = p->prot_minor;	1189	// fast re-sync on source address changes, useful especially for tcp/ip
870		1190	//if (last_si_change < ev_now () + 5.)
871	delete ictx; ictx = cctx;
872
873	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875	si = rsi;
876
877	rekey.set (NOW + ::conf.rekey);
878	keepalive.set (NOW + ::conf.keepalive);
879
880	// send queued packets
881	while (tap_packet *p = queue.get ())
882	{	1191	// {
883	send_data_packet (p);	1192	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1193	conf->nodename, (const char *)si, (const char *)rsi);
		1194
		1195	si = rsi;
		1196
		1197	if (::conf.script_node_change)
884	delete p;	1198	{
		1199	run_script_cb *cb = new run_script_cb;
		1200	cb->set<connection, &connection::script_node_change> (this);
		1201	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1202	}
		1203
885	}	1204	// }
886		1205	//else
887	connectmode = conf->connectmode;	1206	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
888
889	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
890	conf->nodename, (const char *)rsi,	1207	// conf->nodename, (const char *)si, (const char *)rsi);
891	strprotocol (protocol),
892	p->prot_major, p->prot_minor);
893
894	if (::conf.script_node_up)
895	run_script (run_script_cb (this, &connection::script_node_up), false);
896
897	break;
898	}	1208	}
899	else
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
901	conf->nodename, (const char *)rsi);
902	}	1209	}
		1210	else if (seqclass == 1) // far history
		1211	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1214	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 3) // reset
		1217	{
		1218	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1219	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1220	send_reset (rsi);
		1221	}
903		1222
904	delete cctx;	1223	delete d;
		1224	break;
905	}	1225	}
906	}	1226	}
907	}
908		1227
909	send_reset (rsi);	1228	send_reset (rsi);
910	break;	1229	break;
911		1230
912	case vpn_packet::PT_DATA_COMPRESSED:
913	#if !ENABLE_COMPRESSION
914	send_reset (rsi);
915	break;
916	#endif
917
918	case vpn_packet::PT_DATA_UNCOMPRESSED:
919
920	if (ictx && octx)
921	{
922	vpndata_packet *p = (vpndata_packet *)pkt;
923
924	if (rsi == si)
925	{
926	if (!p->hmac_chk (ictx))
927	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
928	"could be an attack, or just corruption or an synchronization error"),
929	conf->nodename, (const char *)rsi);
930	else
931	{
932	u32 seqno;
933	tap_packet *d = p->unpack (this, seqno);
934
935	if (iseqno.recv_ok (seqno))
936	{
937	vpn->tap->send (d);
938
939	if (p->dst () == 0) // re-broadcast
940	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
941	{
942	connection *c = *i;
943
944	if (c->conf != THISNODE && c->conf != conf)
945	c->inject_data_packet (d);
946	}
947
948	delete d;
949
950	break;
951	}
952	}
953	}
954	else
955	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
956	}
957
958	send_reset (rsi);
959	break;
960
961	case vpn_packet::PT_CONNECT_REQ:	1231	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1232	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1233	{
964	connect_req_packet *p = (connect_req_packet *) pkt;	1234	connect_req_packet *p = (connect_req_packet *)pkt;
965		1235
966	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1236	if (p->id > 0 && p->id <= vpn->conns.size ())
967	conf->protocols = p->protocols;	1237	{
968	connection *c = vpn->conns[p->id - 1];	1238	connection *c = vpn->conns[p->id - 1];
		1239	conf->protocols = p->protocols;
969		1240
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1241	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1242	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1243	p->protocols,
971	conf->id, p->id, c->ictx && c->octx);	1244	c->ictx && c->octx);
972		1245
973	if (c->ictx && c->octx)	1246	if (c->ictx && c->octx)
974	{	1247	{
975	// send connect_info packets to both sides, in case one is	1248	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1249	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1250	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1251	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1252	}
		1253	else
		1254	c->establish_connection ();
979	}	1255	}
		1256	else
		1257	slog (L_WARN,
		1258	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1259	p->id);
980	}	1260	}
981		1261
982	break;	1262	break;
983		1263
984	case vpn_packet::PT_CONNECT_INFO:	1264	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1265	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1266	{
987	connect_info_packet *p = (connect_info_packet *) pkt;	1267	connect_info_packet *p = (connect_info_packet *)pkt;
988		1268
989	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1269	if (p->id > 0 && p->id <= vpn->conns.size ())
990	conf->protocols = p->protocols;	1270	{
991	connection *c = vpn->conns[p->id - 1];	1271	connection *c = vpn->conns[p->id - 1];
992		1272
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1273	c->conf->protocols = p->protocols;
994	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1274	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1275	p->si.upgrade_protocol (protocol, c->conf);
995		1276
		1277	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		1278	conf->nodename,
		1279	vpn->conns[p->id - 1]->conf->nodename,
		1280	(const char *)p->si,
		1281	p->protocols,
		1282	protocol,
		1283	p->si.supported_protocols (c->conf),
		1284	!c->ictx && !c->octx);
		1285
		1286	const sockinfo &dsi = forward_si (p->si);
		1287
		1288	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1289	c->send_auth_request (dsi, true);
		1290	else
		1291	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si);
		1294	}
		1295	else
		1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
997	}	1299	}
998		1300
999	break;	1301	break;
1000		1302
1001	default:	1303	default:
1002	send_reset (rsi);	1304	send_reset (rsi);
1003	break;	1305	break;
1004
1005	}	1306	}
1006	}	1307	}
1007		1308
1008	void connection::keepalive_cb (tstamp &ts)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1009	{	1311	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1312	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1313
		1314	if (when >= 0)
		1315	w.start (when);
		1316	else if (when < -15)
1011	{	1317	{
1012	reset_connection ();	1318	reset_connection ();
1013	establish_connection ();	1319	establish_connection ();
1014	}	1320	}
1015	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1321	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1322	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1323	{
		1324	w.start (3);
1020	send_ping (si);	1325	send_ping (si);
1021	ts = NOW + 5;
1022	}	1326	}
		1327	else if (when >= -10)
		1328	// hold ondemand connections implicitly a few seconds longer
		1329	// should delete octx, though, or something like that ;)
		1330	w.start (when + 10);
1023	else	1331	else
1024	reset_connection ();	1332	reset_connection ();
1025	}	1333	}
1026		1334
		1335	void
1027	void connection::connect_request (int id)	1336	connection::send_connect_request (int id)
1028	{	1337	{
1029	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1338	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1030		1339
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1340	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1341	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1342	THISNODE->protocols);
1032	p->hmac_set (octx);	1343	p->hmac_set (octx);
1033	send_vpn_packet (p, si);	1344	send_vpn_packet (p, si);
1034		1345
1035	delete p;	1346	delete p;
1036	}	1347	}
1037		1348
1038	void connection::script_node ()	1349	void
		1350	connection::script_init_env (const char *ext)
1039	{	1351	{
1040	vpn->script_if_up (0);
1041
1042	char *env;	1352	char *env;
		1353	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1354	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1355	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1356	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1357	conf->id & 0xff); putenv (env);
		1358	}
		1359
		1360	void
		1361	connection::script_init_connect_env ()
		1362	{
		1363	vpn->script_init_env ();
		1364
		1365	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1366	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1367	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1368	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1369	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1370	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1371	}
1048		1372
		1373	inline const char *
1049	const char *connection::script_node_up (int)	1374	connection::script_node_up ()
1050	{	1375	{
1051	script_node ();	1376	script_init_connect_env ();
1052		1377
1053	putenv ("STATE=up");	1378	putenv ((char *)"STATE=up");
1054		1379
		1380	char *filename;
		1381	asprintf (&filename,
		1382	"%s/%s",
		1383	confbase,
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1384	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1056	}
1057		1385
		1386	return filename;
		1387	}
		1388
		1389	inline const char *
		1390	connection::script_node_change ()
		1391	{
		1392	script_init_connect_env ();
		1393
		1394	putenv ((char *)"STATE=change");
		1395
		1396	char *filename;
		1397	asprintf (&filename,
		1398	"%s/%s",
		1399	confbase,
		1400	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1401
		1402	return filename;
		1403	}
		1404
		1405	inline const char *
1058	const char *connection::script_node_down (int)	1406	connection::script_node_down ()
1059	{	1407	{
1060	script_node ();	1408	script_init_connect_env ();
1061		1409
1062	putenv ("STATE=down");	1410	putenv ((char *)"STATE=down");
1063		1411
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1412	char *filename;
1065	}	1413	asprintf (&filename,
		1414	"%s/%s",
		1415	confbase,
		1416	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1066		1417
1067	// send a vpn packet out to other hosts	1418	return filename;
1068	void
1069	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1070	{
1071	if (protocol & PROT_IPv4)
1072	vpn->send_ipv4_packet (pkt, si, tos);
1073	else
1074	vpn->send_udpv4_packet (pkt, si, tos);
1075	}	1419	}
1076		1420
1077	connection::connection(struct vpn *vpn_)	1421	connection::connection (struct vpn *vpn, conf_node *conf)
1078	: vpn(vpn_)	1422	: vpn(vpn), conf(conf),
1079	, rekey (this, &connection::rekey_cb)	1423	#if ENABLE_DNS
1080	, keepalive (this, &connection::keepalive_cb)	1424	dns (0),
		1425	#endif
		1426	data_queue(conf->max_ttl, conf->max_queue + 1),
		1427	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1428	{
		1429	rekey .set<connection, &connection::rekey_cb > (this);
		1430	keepalive .set<connection, &connection::keepalive_cb > (this);
1081	, establish_connection (this, &connection::establish_connection_cb)	1431	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1082	{	1432
		1433	last_establish_attempt = 0.;
1083	octx = ictx = 0;	1434	octx = ictx = 0;
1084	retry_cnt = 0;
1085		1435
1086	connectmode = conf_node::C_ALWAYS; // initial setting	1436	connectmode = conf->connectmode;
		1437
		1438	// queue a dummy packet to force an initial connection attempt
		1439	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1440	vpn_queue.put (new net_packet);
		1441
1087	reset_connection ();	1442	reset_connection ();
1088	}	1443	}
1089		1444
1090	connection::~connection ()	1445	connection::~connection ()
1091	{	1446	{
1092	shutdown ();	1447	shutdown ();
1093	}	1448	}
1094		1449
		1450	void
1095	void connection_init ()	1451	connection_init ()
1096	{	1452	{
1097	auth_rate_limiter.clear ();	1453	auth_rate_limiter.clear ();
1098	reset_rate_limiter.clear ();	1454	reset_rate_limiter.clear ();
1099	}	1455	}
1100		1456

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