[ViewVC] Diff of: cvs/gvpe/src/connection.C

Comparing gvpe/src/connection.C (file contents):
Revision 1.17 by pcg, Mon Sep 1 21:23:35 2003 UTC vs.
Revision 1.100 by root, Wed Jul 17 05:34:17 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 <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#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	//////////////////////////////////////////////////////////////////////////////
45		103
46	struct crypto_ctx	104	struct crypto_ctx
47	{	105	{
48	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	107	HMAC_CTX hctx;
50		108
51	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);
52	~crypto_ctx ();	110	~crypto_ctx ();
53	};	111	};
54		112
55	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)
56	{	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), HKDF_XTR_HASH ());
		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 (HKDF_PRF_HASH ());
		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), HKDF_XTR_HASH ());
		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 (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
57	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	147	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	148	}
62		149
63	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
64	{	151	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
67	}	154	}
68		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	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		165	}
		166
		167	static inline bool
		168	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		169	{
		170	u8 rsa_decrypt[RSA_KEYLEN];
		171
		172	if (RSA_private_decrypt (sizeof (encr.rsa),
		173	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		174	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		175	return 0;
		176
		177	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		178	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		179
		180	return 1;
		181	}
		182
69	static void	183	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	184	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	185	{
72	EVP_MD_CTX ctx;	186	HMAC_CTX ctx;
73		187
74	EVP_MD_CTX_init (&ctx);	188	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	189	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	190	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	191	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	192	HMAC_CTX_cleanup (&ctx);
80	}	193	}
81		194
82	struct rsa_entry {	195	void
83	tstamp expire;	196	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	197	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	198	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	199	{
		200	// request data
		201	RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		202	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		203	auth_hash (snd_auth, snd_auth_mac);
131		204
132	} rsa_cache;	205	// eventual response data
133		206	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	207	}
140	w.at = NOW + RSA_TTL;
141		208
142	for (iterator i = begin (); i != end (); )	209	// every use prolongs the expiry
143	if (i->expire <= NOW)	210	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	211	}
149		212
150	//////////////////////////////////////////////////////////////////////////////	213	//////////////////////////////////////////////////////////////////////////////
151		214
152	void pkt_queue::put (net_packet *p)	215	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		216	: max_ttl (max_ttl), max_queue (max_queue)
153	{	217	{
154	if (queue[i])	218	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		219
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	net_packet *pkt_queue::get ()
166	{
167	net_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	220	i = 0;
182	j = 0;	221	j = 0;
		222
		223	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	224	}
184		225
185	pkt_queue::~pkt_queue ()	226	pkt_queue::~pkt_queue ()
186	{	227	{
187	for (i = QUEUEDEPTH; --i > 0; )	228	while (net_packet *p = get ())
		229	delete p;
		230
188	delete queue[i];	231	delete [] queue;
189	}	232	}
190		233
		234	void
		235	pkt_queue::expire_cb (ev::timer &w, int revents)
		236	{
		237	ev_tstamp expire = ev_now () - max_ttl;
		238
		239	for (;;)
		240	{
		241	if (empty ())
		242	break;
		243
		244	double diff = queue[j].tstamp - expire;
		245
		246	if (diff >= 0.)
		247	{
		248	w.start (diff > 0.5 ? diff : 0.5);
		249	break;
		250	}
		251
		252	delete get ();
		253	}
		254	}
		255
		256	void
		257	pkt_queue::put (net_packet *p)
		258	{
		259	ev_tstamp now = ev_now ();
		260
		261	// start expiry timer
		262	if (empty ())
		263	expire.start (max_ttl);
		264
		265	int ni = i + 1 == max_queue ? 0 : i + 1;
		266
		267	if (ni == j)
		268	delete get ();
		269
		270	queue[i].pkt = p;
		271	queue[i].tstamp = now;
		272
		273	i = ni;
		274	}
		275
		276	net_packet *
		277	pkt_queue::get ()
		278	{
		279	if (empty ())
		280	return 0;
		281
		282	net_packet *p = queue[j].pkt;
		283	queue[j].pkt = 0;
		284
		285	j = j + 1 == max_queue ? 0 : j + 1;
		286
		287	return p;
		288	}
		289
191	struct net_rateinfo {	290	struct net_rateinfo
		291	{
192	u32 host;	292	u32 host;
193	double pcnt, diff;	293	double pcnt, diff;
194	tstamp last;	294	tstamp last;
195	};	295	};
196		296
197	// only do action once every x seconds per host whole allowing bursts.	297	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	298	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	299	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	300	struct net_rate_limiter : list<net_rateinfo>
201	{	301	{
202	static const double ALPHA = 1. - 1. / 600.; // allow bursts	302	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	303	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	304	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	305	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		306
207	bool can (const sockinfo &si) { return can((u32)si.host); }	307	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	308	bool can (u32 host);
209	};	309	};
210		310
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	311	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		312
		313	bool
213	bool net_rate_limiter::can (u32 host)	314	net_rate_limiter::can (u32 host)
214	{	315	{
215	iterator i;	316	iterator i;
216		317
217	for (i = begin (); i != end (); )	318	for (i = begin (); i != end (); )
218	if (i->host == host)	319	if (i->host == host)
219	break;	320	break;
220	else if (i->last < NOW - EXPIRE)	321	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	322	i = erase (i);
222	else	323	else
223	i++;	324	i++;
224		325
225	if (i == end ())	326	if (i == end ())
226	{	327	{
227	net_rateinfo ri;	328	net_rateinfo ri;
228		329
229	ri.host = host;	330	ri.host = host;
230	ri.pcnt = 1.;	331	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	332	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	333	ri.last = ev_now ();
233		334
234	push_front (ri);	335	push_front (ri);
235		336
236	return true;	337	return true;
237	}	338	}
238	else	339	else
239	{	340	{
240	net_rateinfo ri (*i);	341	net_rateinfo ri (*i);
241	erase (i);	342	erase (i);
242		343
243	ri.pcnt = ri.pcnt * ALPHA;	344	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	345	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		346
246	ri.last = NOW;	347	ri.last = ev_now ();
247		348
248	double dif = ri.diff / ri.pcnt;	349	double dif = ri.diff / ri.pcnt;
249		350
250	bool send = dif > CUTOFF;	351	bool send = dif > NRL_CUTOFF;
251		352
252	if (dif > MAXDIF)	353	if (dif > NRL_MAXDIF)
253	{	354	{
254	ri.pcnt = 1.;	355	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	356	ri.diff = NRL_MAXDIF;
256	}	357	}
257	else if (send)	358	else if (send)
258	ri.pcnt++;	359	ri.pcnt++;
259		360
260	push_front (ri);	361	push_front (ri);
265		366
266	/////////////////////////////////////////////////////////////////////////////	367	/////////////////////////////////////////////////////////////////////////////
267		368
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	369	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
269		370
		371	void
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx)
271	{	373	{
272	unsigned int xlen;	374	unsigned int xlen;
273		375
274	HMAC_CTX *hctx = &ctx->hctx;	376	HMAC_CTX *hctx = &ctx->hctx;
275		377
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	378	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	379	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
278	len - sizeof (hmac_packet));	380	len - sizeof (hmac_packet)));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	381	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
280	}	382	}
281		383
282	void	384	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	385	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	386	{
…		…
293	hmac_gen (ctx);	395	hmac_gen (ctx);
294		396
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	397	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	398	}
297		399
		400	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	401	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	402	{
300	type = type_;	403	type = type_;
301		404
302	int src = THISNODE->id;	405	int src = THISNODE->id;
303		406
…		…
307	}	410	}
308		411
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	412	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	413	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		414
312	struct vpndata_packet:vpn_packet	415	struct vpndata_packet : vpn_packet
		416	{
		417	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		418
		419	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		420	tap_packet unpack (connection conn, u32 &seqno);
		421
		422	private:
		423	const u32 data_hdr_size () const
313	{	424	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
316	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
317	tap_packet unpack (connection conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	425	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	426	}
		427	};
325		428
326	void	429	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	430	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	431	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	432	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	433	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	434	ptype type = PT_DATA_UNCOMPRESSED;
332		435
333	#if ENABLE_COMPRESSION	436	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	437	u8 cdata[MAX_MTU];
335	u32 cl;
336		438
		439	if (conn->features & FEATURE_COMPRESSION)
		440	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	441	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		442
338	if (cl)	443	if (cl)
339	{	444	{
340	type = PT_DATA_COMPRESSED;	445	type = PT_DATA_COMPRESSED;
341	d = cdata;	446	d = cdata;
342	l = cl + 2;	447	l = cl + 2;
343		448
344	d[0] = cl >> 8;	449	d[0] = cl >> 8;
345	d[1] = cl;	450	d[1] = cl;
		451	}
346	}	452	}
347	#endif	453	#endif
348		454
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	455	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		456
351	struct {	457	struct {
352	#if RAND_SIZE	458	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	459	u8 rnd[RAND_SIZE];
354	#endif	460	#endif
355	u32 seqno;	461	u32 seqno;
356	} datahdr;	462	} datahdr;
357		463
358	datahdr.seqno = ntohl (seqno);	464	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	465	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	466	RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
361	#endif	467	#endif
362		468
363	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	472	outl += outl2;
367		473
368	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	476	(unsigned char *) d, l));
371	outl += outl2;	477	outl += outl2;
372		478
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	480	outl += outl2;
375		481
376	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
377		483
378	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	493	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
389	u8 *d;	495	u8 *d;
390	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
391		497
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		499
394	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
396		502
397	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
…		…
399	else	505	else
400	#endif	506	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6 - DATAHDR];
402		508
403	/* this overwrites part of the src mac, but we fix that later */	509	/* this overwrites part of the src mac, but we fix that later */
404	EVP_DecryptUpdate (cctx,	510	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	511	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	512	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	513	outl += outl2;
408		514
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	516	outl += outl2;
411		517
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	518	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		519
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	520	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	545	}
440	};	546	};
441		547
442	struct config_packet : vpn_packet	548	struct config_packet : vpn_packet
443	{	549	{
444	// actually, hmaclen cannot be checked because the hmac
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	550	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	551	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	552	u32 cipher_nid, mac_nid, auth_nid;
450
451	const u8 curflags () const
452	{
453	return 0x80
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}
456		553
457	void setup (ptype type, int dst);	554	void setup (ptype type, int dst);
458	bool chk_config () const;	555	bool chk_config () const;
		556
		557	static u8 get_features ()
		558	{
		559	u8 f = 0;
		560	#if ENABLE_COMPRESSION
		561	f \|= FEATURE_COMPRESSION;
		562	#endif
		563	#if ENABLE_ROHC
		564	f \|= FEATURE_ROHC;
		565	#endif
		566	#if ENABLE_BRIDGING
		567	f \|= FEATURE_BRIDGING;
		568	#endif
		569	return f;
		570	}
459	};	571	};
460		572
		573	void
461	void config_packet::setup (ptype type, int dst)	574	config_packet::setup (ptype type, int dst)
462	{	575	{
463	prot_major = PROTOCOL_MAJOR;	576	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	577	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	578	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	579	flags = 0;
467	flags = curflags ();	580	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		581
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	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 ()));
473		585
474	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	587	set_hdr (type, dst);
476	}	588	}
477		589
		590	bool
478	bool config_packet::chk_config () const	591	config_packet::chk_config () const
479	{	592	{
480	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	594	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
482	else if (randsize != RAND_SIZE)	595	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	596	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
484	else if (hmaclen != HMACLENGTH)
485	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
486	else if (flags != curflags ())
487	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
488	else if (challengelen != sizeof (rsachallenge))
489	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
490	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	597	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	598	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
493	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
494	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	599	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
495	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	600	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		601	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		602	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
496	else	603	else
497	return true;	604	return true;
498		605
499	return false;	606	return false;
500	}	607	}
501		608
502	struct auth_req_packet : config_packet	609	struct auth_req_packet : config_packet // UNPROTECTED
503	{	610	{
504	char magic[8];	611	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	612	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	613	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	614	u8 pad2, pad3;
508	rsaid id;	615	auth_encr encr;
509	rsaencrdata encr;
510		616
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	617	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	618	{
513	config_packet::setup (PT_AUTH_REQ, dst);	619	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	620	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	621	initiate = !!initiate_;
516	protocols = protocols_;	622	protocols = protocols_;
517		623
518	len = sizeof (*this) - sizeof (net_packet);	624	len = sizeof (*this) - sizeof (net_packet);
519	}	625	}
520	};	626	};
521		627
522	struct auth_res_packet : config_packet	628	struct auth_res_packet : config_packet // UNPROTECTED
523	{	629	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	630	auth_response response;
528		631
529	auth_res_packet (int dst)	632	auth_res_packet (int dst)
530	{	633	{
531	config_packet::setup (PT_AUTH_RES, dst);	634	config_packet::setup (PT_AUTH_RES, dst);
532		635
…		…
566	};	669	};
567		670
568	/////////////////////////////////////////////////////////////////////////////	671	/////////////////////////////////////////////////////////////////////////////
569		672
570	void	673	void
571	connection::connection_established ()	674	connection::connection_established (const sockinfo &rsi)
572	{	675	{
		676	if (!have_snd_auth \|\| !have_rcv_auth)
		677	return;
		678
		679	si = rsi;
		680	protocol = rsi.prot;
		681
		682	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		683	conf->nodename, (const char *)rsi,
		684	is_direct ? "direct" : "forwarded",
		685	PROTOCOL_MAJOR, prot_minor);
		686
		687	if (::conf.script_node_up)
		688	{
		689	run_script_cb *cb = new run_script_cb;
		690	cb->set<connection, &connection::script_node_up> (this);
		691	run_script_queued (cb, _("node-up command execution failed, continuing."));
		692	}
		693
		694	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		695	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		696
		697	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		698	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		699
573	if (ictx && octx)	700	if (ictx && octx)
574	{	701	{
575	connectmode = conf->connectmode;	702	// make sure rekeying timeouts are slightly asymmetric
		703	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		704	rekey.start (rekey_interval, rekey_interval);
576		705
577	rekey.start (NOW + ::conf.rekey);
578	keepalive.start (NOW + ::conf.keepalive);	706	keepalive.start (::conf.keepalive);
579		707
580	// send queued packets	708	// send queued packets
581	if (ictx && octx)	709	if (ictx && octx)
582	{	710	{
583	while (tap_packet p = (tap_packet )data_queue.get ())	711	while (tap_packet p = (tap_packet )data_queue.get ())
584	{	712	{
585	send_data_packet (p);	713	if (p->len) send_data_packet (p);
586	delete p;	714	delete p;
587	}	715	}
588		716
589	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	717	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
590	{	718	{
591	send_vpn_packet (p, si, IPTOS_RELIABILITY);	719	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
592	delete p;	720	delete p;
593	}	721	}
594	}	722	}
		723
		724	vpn->connection_established (this);
595	}	725	}
		726	#if 0
596	else	727	else
597	{	728	{
598	retry_cnt = 0;	729	retry_cnt = 0;
599	establish_connection.start (NOW + 5);	730	establish_connection.start (5);
600	keepalive.reset ();	731	keepalive.stop ();
601	rekey.reset ();	732	rekey.stop ();
602	}	733	}
		734	#endif
603	}	735	}
604		736
605	void	737	void
606	connection::reset_si ()	738	connection::reset_si ()
607	{	739	{
		740	if (vpn->can_direct (THISNODE, conf))
608	protocol = best_protocol (THISNODE->protocols & conf->protocols);	741	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
609		742	else
610	// mask out protocols we cannot establish	743	{
611	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	744	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	745	protocol = 0;
		746	}
613		747
614	si.set (conf, protocol);	748	si.set (conf, protocol);
		749
		750	is_direct = si.valid ();
615	}	751	}
616		752
617	// ensure sockinfo is valid, forward if necessary	753	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	754	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	755	connection::forward_si (const sockinfo &si) const
620	{	756	{
621	if (!si.valid ())	757	if (!si.valid ())
622	{	758	{
623	connection *r = vpn->find_router ();	759	connection *r = vpn->find_router_for (this);
624		760
625	if (r)	761	if (r)
626	{	762	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	763	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	764	conf->nodename, r->conf->nodename);
629	return r->si;	765	return r->si;
630	}	766	}
631	else	767	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	768	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	769	conf->nodename);
634	}	770	}
635		771
636	return si;	772	return si;
637	}	773	}
…		…
647	connection::send_ping (const sockinfo &si, u8 pong)	783	connection::send_ping (const sockinfo &si, u8 pong)
648	{	784	{
649	ping_packet *pkt = new ping_packet;	785	ping_packet *pkt = new ping_packet;
650		786
651	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	787	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		788
		789	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	790	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		791
654	delete pkt;	792	delete pkt;
655	}	793	}
656		794
…		…
671	void	809	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	810	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	811	{
674	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	812	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675		813
676	rsachallenge chg;	814	generate_auth_data ();
		815	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		816
678	rsa_cache.gen (pkt->id, chg);
679
680	if (0 > RSA_public_encrypt (sizeof chg,
681	(unsigned char )&chg, (unsigned char )&pkt->encr,
682	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
683	fatal ("RSA_public_encrypt error");
684
685	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	817	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
686
687	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	818	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
688		819
689	delete pkt;	820	delete pkt;
690	}	821	}
691		822
692	void	823	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	824	connection::send_auth_response (const sockinfo &si)
694	{	825	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	826	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		827
697	pkt->id = id;	828	auth_hash (rcv_auth, pkt->response.mac);
		829	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
698		830
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	831	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
704
705	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	832	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
706		833
707	delete pkt;	834	delete pkt;
708	}	835	}
709		836
710	void	837	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	838	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	839	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	840	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	841	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		842	conf->protocols);
715		843
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	844	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		845
718	r->hmac_set (octx);	846	r->hmac_set (octx);
719	send_vpn_packet (r, si);	847	send_vpn_packet (r, si);
720		848
721	delete r;	849	delete r;
722	}	850	}
723		851
724	void	852	inline void
725	connection::establish_connection_cb (time_watcher &w)	853	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	854	{
727	if (ictx \|\| conf == THISNODE	855	if (!(ictx && octx)
		856	&& conf != THISNODE
728	\|\| connectmode == conf_node::C_NEVER	857	&& connectmode != conf_node::C_NEVER
729	\|\| connectmode == conf_node::C_DISABLED)	858	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	859	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	860	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	861	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		862	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	863	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		864	{
		865	reset_connection ();
736	retry_cnt++;	866	return;
		867	}
737		868
738	w.at = NOW + retry_int;	869	last_establish_attempt = ev_now ();
		870
		871	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		872	? (retry_cnt & 3) + 1
		873	: 1 << (retry_cnt >> 2));
739		874
740	reset_si ();	875	reset_si ();
741		876
742	if (si.prot && !si.host)	877	bool slow = si.prot & PROT_SLOW;
		878
		879	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		880	{
		881	/TODO/ /* start the timer so we don't recurse endlessly */
		882	w.start (1);
743	vpn->send_connect_request (conf->id);	883	vpn->send_connect_request (this);
		884	}
744	else	885	else
745	{	886	{
		887	if (si.valid ())
		888	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		889	conf->nodename, (const char *)si);
		890
746	const sockinfo &dsi = forward_si (si);	891	const sockinfo &dsi = forward_si (si);
		892
		893	slow = slow \|\| (dsi.prot & PROT_SLOW);
747		894
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	895	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	896	{
750	if (retry_cnt < 4)	897	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	898	send_auth_request (dsi, true);
752	else	899	else
753	send_ping (dsi, 0);	900	send_ping (dsi, 0);
754	}	901	}
755	}	902	}
		903
		904	retry_int *= slow ? 8. : 0.9;
		905
		906	if (retry_int < conf->max_retry)
		907	retry_cnt++;
		908	else
		909	retry_int = conf->max_retry;
		910
		911	w.start (retry_int);
756	}	912	}
757	}	913	}
758		914
759	void	915	void
760	connection::reset_connection ()	916	connection::reset_connection ()
…		…
763	{	919	{
764	slog (L_INFO, _("%s(%s): connection lost"),	920	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	921	conf->nodename, (const char *)si);
766		922
767	if (::conf.script_node_down)	923	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	924	{
		925	run_script_cb *cb = new run_script_cb;
		926	cb->set<connection, &connection::script_node_down> (this);
		927	run_script_queued (cb, _("node-down command execution failed, continuing."));
		928	}
769	}	929	}
770		930
771	delete ictx; ictx = 0;	931	delete ictx; ictx = 0;
772	delete octx; octx = 0;	932	delete octx; octx = 0;
773		933
774	si.host= 0;	934	si.host = 0;
775		935
		936	have_snd_auth = false;
		937	have_rcv_auth = false;
		938	auth_expire = 0.;
		939
776	last_activity = 0;	940	last_activity = 0.;
		941	//last_si_change = 0.;
777	retry_cnt = 0;	942	retry_cnt = 0;
778		943
779	rekey.reset ();	944	rekey.stop ();
780	keepalive.reset ();	945	keepalive.stop ();
781	establish_connection.reset ();	946	establish_connection.stop ();
782	}	947	}
783		948
784	void	949	void
785	connection::shutdown ()	950	connection::shutdown ()
786	{	951	{
…		…
788	send_reset (si);	953	send_reset (si);
789		954
790	reset_connection ();	955	reset_connection ();
791	}	956	}
792		957
793	void	958	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	959	inline void
		960	connection::rekey_cb (ev::timer &w, int revents)
795	{	961	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	962	reset_connection ();
799	establish_connection ();	963	establish_connection ();
800	}	964	}
801		965
802	void	966	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	967	connection::send_data_packet (tap_packet *pkt)
804	{	968	{
805	vpndata_packet *p = new vpndata_packet;	969	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	970	int tos = 0;
807		971
808	// I am not hilarious about peeking into packets, but so be it.	972	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	973	if (conf->inherit_tos && pkt->is_ipv4 ())
810	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
811	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812	tos = (*pkt)[15] & IPTOS_TOS_MASK;	974	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		975
814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	976	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815	send_vpn_packet (p, si, tos);	977	send_vpn_packet (p, si, tos);
816		978
817	delete p;	979	delete p;
818		980
819	if (oseqno > MAX_SEQNO)	981	if (oseqno > MAX_SEQNO)
820	rekey ();	982	rekey ();
821	}	983	}
822		984
823	void	985	void
		986	connection::post_inject_queue ()
		987	{
		988	// force a connection every now and when when packets are sent (max 1/s)
		989	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		990	establish_connection.stop ();
		991
		992	establish_connection ();
		993	}
		994
		995	void
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	996	connection::inject_data_packet (tap_packet *pkt)
825	{	997	{
826	if (ictx && octx)	998	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	999	send_data_packet (pkt);
828	else	1000	else
829	{	1001	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1002	data_queue.put (new tap_packet (*pkt));
832		1003	post_inject_queue ();
833	establish_connection ();
834	}	1004	}
835	}	1005	}
836		1006
		1007	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1008	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1009	{
839	if (ictx && octx)	1010	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1011	send_vpn_packet (pkt, si, tos);
841	else	1012	else
842	{	1013	{
843	vpn_queue.put (new vpn_packet (*pkt));	1014	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
844		1015	post_inject_queue ();
845	establish_connection ();
846	}	1016	}
847	}	1017	}
848		1018
849	void	1019	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1020	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1021	{
852	last_activity = NOW;	1022	last_activity = ev_now ();
853		1023
854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1024	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1025	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1026
		1027	if (connectmode == conf_node::C_DISABLED)
		1028	return;
856		1029
857	switch (pkt->typ ())	1030	switch (pkt->typ ())
858	{	1031	{
859	case vpn_packet::PT_PING:	1032	case vpn_packet::PT_PING:
		1033	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1034
860	// we send pings instead of auth packets after some retries,	1035	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1036	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1037	// when we receive a ping.
863	if (!ictx)	1038	if (!ictx)
864	{	1039	{
865	if (auth_rate_limiter.can (rsi))	1040	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1041	send_auth_request (rsi, true);
867	}	1042	}
868	else	1043	else
		1044	// we would love to change the socket address here, but ping's aren't
		1045	// authenticated, so we best ignore it.
869	send_ping (rsi, 1); // pong	1046	send_ping (rsi, 1); // pong
870		1047
871	break;	1048	break;
872		1049
873	case vpn_packet::PT_PONG:	1050	case vpn_packet::PT_PONG:
		1051	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1052
		1053	// a PONG might mean that the other side doesn't really know
		1054	// about our desire for communication.
		1055	establish_connection ();
874	break;	1056	break;
875		1057
876	case vpn_packet::PT_RESET:	1058	case vpn_packet::PT_RESET:
877	{	1059	{
878	reset_connection ();	1060	reset_connection ();
879		1061
880	config_packet p = (config_packet ) pkt;	1062	config_packet p = (config_packet ) pkt;
881		1063
882	if (!p->chk_config ())	1064	if (!p->chk_config ())
883	{	1065	{
884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1066	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
885	conf->nodename, (const char *)rsi);	1067	conf->nodename, (const char *)rsi);
886	connectmode = conf_node::C_DISABLED;	1068	connectmode = conf_node::C_DISABLED;
887	}	1069	}
888	else if (connectmode == conf_node::C_ALWAYS)	1070	else if (connectmode == conf_node::C_ALWAYS)
889	establish_connection ();	1071	establish_connection ();
…		…
891	break;	1073	break;
892		1074
893	case vpn_packet::PT_AUTH_REQ:	1075	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1076	if (auth_rate_limiter.can (rsi))
895	{	1077	{
896	auth_req_packet p = (auth_req_packet ) pkt;	1078	auth_req_packet p = (auth_req_packet )pkt;
897		1079
898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1080	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1081	conf->nodename, p->initiate ? "initiate" : "reply",
		1082	p->protocols, p->features);
899		1083
900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1084	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
901	{	1085	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1086	if (p->prot_minor != PROTOCOL_MINOR)
903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1087	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
904	conf->nodename, (const char *)rsi,	1088	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1089	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1090
907	if (p->initiate)	1091	if (p->initiate)
908	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
909		1093
910	rsachallenge k;	1094	auth_data auth;
911		1095
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1096	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
913	(unsigned char )&p->encr, (unsigned char )&k,	1097	{
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1098	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1099	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1100	}
917	else	1101	else
918	{	1102	{
919	delete octx;	1103	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
920		1104
921	octx = new crypto_ctx (k, 1);	1105	rcv_auth = auth;
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1106	have_rcv_auth = true;
923		1107
		1108	send_auth_response (rsi);
		1109
		1110	if (chg)
		1111	{
924	conf->protocols = p->protocols;	1112	conf->protocols = p->protocols;
		1113	features = p->features & config_packet::get_features ();
925		1114
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1115	connection_established (rsi);
929
930	break;	1116	}
931	}	1117	}
		1118
		1119	break;
932	}	1120	}
933	else	1121	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),	1122	slog (L_WARN, _("%s(%s): protocol mismatch."),
935	conf->nodename, (const char *)rsi);	1123	conf->nodename, (const char *)rsi);
936		1124
937	send_reset (rsi);	1125	send_reset (rsi);
938	}	1126	}
939		1127
940	break;	1128	break;
941		1129
942	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
943	{	1131	{
944	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
945		1133
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1135
948	if (p->chk_config ())	1136	if (p->chk_config ())
949	{	1137	{
950	if (p->prot_minor != PROTOCOL_MINOR)	1138	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
951	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
952	conf->nodename, (const char *)rsi,
953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
954
955	rsachallenge chg;
956
957	if (!rsa_cache.find (p->id, chg))
958	{	1139	{
959	slog (L_ERR, _("%s(%s): unrequested auth response"),	1140	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1141	conf->nodename, (const char *)rsi);
961	break;
962	}	1142	}
963	else	1143	else if (!have_snd_auth)
964	{	1144	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1145	if (p->prot_minor != PROTOCOL_MINOR)
966		1146	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
967	if (!p->hmac_chk (cctx))
968	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
969	"could be an attack, or just corruption or an synchronization error"),
970	conf->nodename, (const char *)rsi);	1147	conf->nodename, (const char *)rsi,
971	else	1148	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
972	{
973	rsaresponse h;
974		1149
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;	1150	prot_minor = p->prot_minor;
		1151	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
980		1152
981	delete ictx; ictx = cctx;	1153	have_snd_auth = true;
982
983	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();	1154	connection_established (rsi);
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}	1155	}
		1156
		1157	break;
1006	}	1158	}
1007	}	1159	}
1008		1160
1009	send_reset (rsi);	1161	send_reset (rsi);
1010	break;	1162	break;
…		…
1021	{	1173	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
1023		1175
1024	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1028	else	1180	else
1029	{	1181	{
1030	u32 seqno;	1182	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1032		1185
1033	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1034	{	1187	{
1035	vpn->tap->send (d);	1188	vpn->tap->send (d);
1036		1189
1037	if (p->dst () == 0) // re-broadcast
1038	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1039	{
1040	connection c = i;
1041
1042	if (c->conf != THISNODE && c->conf != conf)
1043	c->inject_data_packet (d);
1044	}
1045
1046	if (si != rsi)	1190	if (si != rsi)
1047	{	1191	{
1048	// fast re-sync on connection changes, useful especially for tcp/ip	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
1049	si = rsi;	1194	// {
1050
1051	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1052	conf->nodename, (const char )si, (const char )rsi);	1196	conf->nodename, (const char )si, (const char )rsi);
		1197
		1198	si = rsi;
		1199
		1200	if (::conf.script_node_change)
		1201	{
		1202	run_script_cb *cb = new run_script_cb;
		1203	cb->set<connection, &connection::script_node_change> (this);
		1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1205	}
		1206
		1207	// }
		1208	//else
		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1210	// conf->nodename, (const char )si, (const char )rsi);
1053	}	1211	}
1054
1055	delete d;
1056
1057	break;
1058	}	1212	}
		1213	else if (seqclass == 1) // far history
		1214	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1217	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1218	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1219	else if (seqclass == 3) // reset
		1220	{
		1221	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1222	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1223	send_reset (rsi);
		1224	}
		1225
		1226	delete d;
		1227	break;
1059	}	1228	}
1060	}	1229	}
1061		1230
1062	send_reset (rsi);	1231	send_reset (rsi);
1063	break;	1232	break;
1064		1233
1065	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1066	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1067	{	1236	{
1068	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
1069		1238
1070	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1239	if (p->id > 0 && p->id <= vpn->conns.size ())
1071	connection *c = vpn->conns[p->id - 1];
1072	conf->protocols = p->protocols;
1073
1074	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1075	conf->id, p->id, c->ictx && c->octx);
1076
1077	if (c->ictx && c->octx)
1078	{	1240	{
		1241	connection *c = vpn->conns[p->id - 1];
		1242	conf->protocols = p->protocols;
		1243
		1244	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1245	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1246	p->protocols,
		1247	c->ictx && c->octx);
		1248
		1249	if (c->ictx && c->octx)
		1250	{
1079	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1080	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1081	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1082	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1254	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1255	}
		1256	else
		1257	c->establish_connection ();
1083	}	1258	}
1084	else	1259	else
1085	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1086	}	1263	}
1087		1264
1088	break;	1265	break;
1089		1266
1090	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1091	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1092	{	1269	{
1093	connect_info_packet p = (connect_info_packet ) pkt;	1270	connect_info_packet p = (connect_info_packet )pkt;
1094		1271
1095	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1272	if (p->id > 0 && p->id <= vpn->conns.size ())
1096		1273	{
1097	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1098		1275
1099	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1100	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1101	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1102		1279
1103	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1280	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1104	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1281	conf->nodename,
		1282	vpn->conns[p->id - 1]->conf->nodename,
		1283	(const char *)p->si,
		1284	p->protocols,
		1285	protocol,
		1286	p->si.supported_protocols (c->conf),
		1287	!c->ictx && !c->octx);
1105		1288
1106	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1107		1290
1108	if (dsi.valid ())	1291	if (dsi.valid ())
1109	c->send_auth_request (dsi, true);	1292	c->send_auth_request (dsi, true);
		1293	else
		1294	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1295	vpn->conns[p->id - 1]->conf->nodename,
		1296	(const char *)p->si);
		1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1110	}	1302	}
1111		1303
1112	break;	1304	break;
1113		1305
1114	default:	1306	default:
1115	send_reset (rsi);	1307	send_reset (rsi);
1116	break;	1308	break;
1117	}	1309	}
1118	}	1310	}
1119		1311
1120	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1121	{	1314	{
1122	if (NOW >= last_activity + ::conf.keepalive + 30)	1315	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1316
		1317	if (when >= 0)
		1318	w.start (when);
		1319	else if (when < -15)
1123	{	1320	{
1124	reset_connection ();	1321	reset_connection ();
1125	establish_connection ();	1322	establish_connection ();
1126	}	1323	}
1127	else if (NOW < last_activity + ::conf.keepalive)
1128	w.at = last_activity + ::conf.keepalive;
1129	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1130	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1131	{	1326	{
		1327	w.start (3);
1132	send_ping (si);	1328	send_ping (si);
1133	w.at = NOW + 5;
1134	}	1329	}
1135	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1136	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1137	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1138	w.at = last_activity + ::conf.keepalive + 10;	1333	w.start (when + 10);
1139	else	1334	else
1140	reset_connection ();	1335	reset_connection ();
1141	}	1336	}
1142		1337
		1338	void
1143	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1144	{	1340	{
1145	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1341	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1146		1342
1147	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1343	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1344	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1345	THISNODE->protocols);
1148	p->hmac_set (octx);	1346	p->hmac_set (octx);
1149	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1150		1348
1151	delete p;	1349	delete p;
1152	}	1350	}
1153		1351
1154	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1155	{	1354	{
1156	vpn->script_if_up ();
1157
1158	char *env;	1355	char *env;
		1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1360	conf->id & 0xff); putenv (env);
		1361	}
		1362
		1363	void
		1364	connection::script_init_connect_env ()
		1365	{
		1366	vpn->script_init_env ();
		1367
		1368	char *env;
1159	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1369	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1370	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1160	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1161	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1162	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1163	}	1374	}
1164		1375
		1376	inline const char *
1165	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1166	{	1378	{
1167	script_node ();	1379	script_init_connect_env ();
1168		1380
1169	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1170		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1171	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1172	}
1173		1388
		1389	return filename;
		1390	}
		1391
		1392	inline const char *
		1393	connection::script_node_change ()
		1394	{
		1395	script_init_connect_env ();
		1396
		1397	putenv ((char *)"STATE=change");
		1398
		1399	char *filename;
		1400	asprintf (&filename,
		1401	"%s/%s",
		1402	confbase,
		1403	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1404
		1405	return filename;
		1406	}
		1407
		1408	inline const char *
1174	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1175	{	1410	{
1176	script_node ();	1411	script_init_connect_env ();
1177		1412
1178	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1179		1414
1180	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1181	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1182		1420
		1421	return filename;
		1422	}
		1423
1183	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn vpn, conf_node conf)
1184	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1185	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1186	, keepalive (this, &connection::keepalive_cb)	1427	dns (0),
		1428	#endif
		1429	data_queue(conf->max_ttl, conf->max_queue + 1),
		1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1431	{
		1432	rekey .set<connection, &connection::rekey_cb > (this);
		1433	keepalive .set<connection, &connection::keepalive_cb > (this);
1187	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1188	{	1435
		1436	last_establish_attempt = 0.;
1189	octx = ictx = 0;	1437	octx = ictx = 0;
1190	retry_cnt = 0;
1191		1438
1192	connectmode = conf_node::C_ALWAYS; // initial setting	1439	connectmode = conf->connectmode;
		1440
		1441	// queue a dummy packet to force an initial connection attempt
		1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1443	vpn_queue.put (new net_packet);
		1444
1193	reset_connection ();	1445	reset_connection ();
1194	}	1446	}
1195		1447
1196	connection::~connection ()	1448	connection::~connection ()
1197	{	1449	{
1198	shutdown ();	1450	shutdown ();
1199	}	1451	}
1200		1452
		1453	void
1201	void connection_init ()	1454	connection_init ()
1202	{	1455	{
1203	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1204	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1205	}	1458	}
1206		1459

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Comparing gvpe/src/connection.C (file contents): Revision 1.17 by pcg, Mon Sep 1 21:23:35 2003 UTC vs. Revision 1.100 by root, Wed Jul 17 05:34:17 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.17 by pcg, Mon Sep 1 21:23:35 2003 UTC vs.
Revision 1.100 by root, Wed Jul 17 05:34:17 2013 UTC