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

Comparing gvpe/src/connection.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 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	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		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 (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
73		186
74	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
80	}	192	}
81		193
82	struct rsa_entry {	194	void
83	tstamp expire;	195	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	196	{
90	void cleaner_cb (tstamp &ts); time_watcher cleaner;	197	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	{ }	198	{
		199	// request data
		200	rand_fill (snd_auth.rsa);
		201	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		202	auth_hash (snd_auth, snd_auth_mac);
131		203
132	} rsa_cache;	204	// eventual response data
133		205	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (tstamp &ts)
135	{
136	if (empty ())
137	ts = TSTAMP_CANCEL;
138	else
139	{	206	}
140	ts = NOW + RSA_TTL;
141		207
142	for (iterator i = begin (); i != end (); )	208	// every use prolongs the expiry
143	if (i->expire <= NOW)	209	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	210	}
149		211
150	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
151		213
152	void pkt_queue::put (tap_packet *p)	214	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		215	: max_ttl (max_ttl), max_queue (max_queue)
153	{	216	{
154	if (queue[i])	217	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		218
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_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;	219	i = 0;
182	j = 0;	220	j = 0;
		221
		222	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	223	}
184		224
185	pkt_queue::~pkt_queue ()	225	pkt_queue::~pkt_queue ()
186	{	226	{
187	for (i = QUEUEDEPTH; --i > 0; )	227	while (net_packet *p = get ())
		228	delete p;
		229
188	delete queue[i];	230	delete [] queue;
189	}	231	}
190		232
		233	void
		234	pkt_queue::expire_cb (ev::timer &w, int revents)
		235	{
		236	ev_tstamp expire = ev_now () - max_ttl;
		237
		238	for (;;)
		239	{
		240	if (empty ())
		241	break;
		242
		243	double diff = queue[j].tstamp - expire;
		244
		245	if (diff >= 0.)
		246	{
		247	w.start (diff > 0.5 ? diff : 0.5);
		248	break;
		249	}
		250
		251	delete get ();
		252	}
		253	}
		254
		255	void
		256	pkt_queue::put (net_packet *p)
		257	{
		258	ev_tstamp now = ev_now ();
		259
		260	// start expiry timer
		261	if (empty ())
		262	expire.start (max_ttl);
		263
		264	int ni = i + 1 == max_queue ? 0 : i + 1;
		265
		266	if (ni == j)
		267	delete get ();
		268
		269	queue[i].pkt = p;
		270	queue[i].tstamp = now;
		271
		272	i = ni;
		273	}
		274
		275	net_packet *
		276	pkt_queue::get ()
		277	{
		278	if (empty ())
		279	return 0;
		280
		281	net_packet *p = queue[j].pkt;
		282	queue[j].pkt = 0;
		283
		284	j = j + 1 == max_queue ? 0 : j + 1;
		285
		286	return p;
		287	}
		288
191	struct net_rateinfo {	289	struct net_rateinfo
		290	{
192	u32 host;	291	u32 host;
193	double pcnt, diff;	292	double pcnt, diff;
194	tstamp last;	293	tstamp last;
195	};	294	};
196		295
197	// only do action once every x seconds per host whole allowing bursts.	296	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	297	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	298	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	299	struct net_rate_limiter : list<net_rateinfo>
201	{	300	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	301	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	302	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	303	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		304	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		305
206	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	307	bool can (u32 host);
208	};	308	};
209		309
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		311
		312	bool
212	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
213	{	314	{
214	iterator i;	315	iterator i;
215		316
216	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
217	if (i->host == host)	318	if (i->host == host)
218	break;	319	break;
219	else if (i->last < NOW - EXPIRE)	320	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	321	i = erase (i);
221	else	322	else
222	i++;	323	i++;
223		324
224	if (i == end ())	325	if (i == end ())
225	{	326	{
226	net_rateinfo ri;	327	net_rateinfo ri;
227		328
228	ri.host = host;	329	ri.host = host;
229	ri.pcnt = 1.;	330	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	331	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	332	ri.last = ev_now ();
232		333
233	push_front (ri);	334	push_front (ri);
234		335
235	return true;	336	return true;
236	}	337	}
237	else	338	else
238	{	339	{
239	net_rateinfo ri (*i);	340	net_rateinfo ri (*i);
240	erase (i);	341	erase (i);
241		342
242	ri.pcnt = ri.pcnt * ALPHA;	343	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	344	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		345
245	ri.last = NOW;	346	ri.last = ev_now ();
246		347
		348	double dif = ri.diff / ri.pcnt;
		349
247	bool send = ri.diff / ri.pcnt > CUTOFF;	350	bool send = dif > NRL_CUTOFF;
248		351
		352	if (dif > NRL_MAXDIF)
		353	{
		354	ri.pcnt = 1.;
		355	ri.diff = NRL_MAXDIF;
		356	}
249	if (send)	357	else if (send)
250	ri.pcnt++;	358	ri.pcnt++;
251		359
252	push_front (ri);	360	push_front (ri);
253		361
254	return send;	362	return send;
257		365
258	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
259		367
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
261		369
		370	void
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
263	{	372	{
264	unsigned int xlen;	373	unsigned int xlen;
265		374
266	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
267		376
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
270	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
272	}	381	}
273		382
274	void	383	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	385	{
…		…
285	hmac_gen (ctx);	394	hmac_gen (ctx);
286		395
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	397	}
289		398
		399	void
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	401	{
292	this->type = type;	402	type = type_;
293		403
294	int src = THISNODE->id;	404	int src = THISNODE->id;
295		405
296	src1 = src;	406	src1 = src;
297	srcdst = ((src >> 8) << 4) \| (dst >> 8);	407	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
299	}	409	}
300		410
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		413
304	struct vpndata_packet:vpn_packet	414	struct vpndata_packet : vpn_packet
		415	{
		416	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		417
		418	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		419	tap_packet unpack (connection conn, u32 &seqno);
		420
		421	private:
		422	const u32 data_hdr_size () const
305	{	423	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307
308	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
309	tap_packet unpack (connection conn, u32 &seqno);
310	private:
311
312	const u32 data_hdr_size () const
313	{
314	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	425	}
		426	};
317		427
318	void	428	void
319	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	429	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
320	{	430	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	432	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
324		434
325	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
327	u32 cl;
328		437
		438	if (conn->features & FEATURE_COMPRESSION)
		439	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		441
330	if (cl)	442	if (cl)
331	{	443	{
332	type = PT_DATA_COMPRESSED;	444	type = PT_DATA_COMPRESSED;
333	d = cdata;	445	d = cdata;
334	l = cl + 2;	446	l = cl + 2;
335		447
336	d[0] = cl >> 8;	448	d[0] = cl >> 8;
337	d[1] = cl;	449	d[1] = cl;
		450	}
338	}	451	}
339	#endif	452	#endif
340		453
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		455
343	struct {	456	struct {
344	#if RAND_SIZE	457	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
346	#endif	459	#endif
347	u32 seqno;	460	u32 seqno;
348	} datahdr;	461	} datahdr;
349		462
350	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	464	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	465	// NB: a constant (per session) random prefix
		466	// is likely enough, but we don't take any chances.
		467	conn->oiv.get (datahdr.rnd, RAND_SIZE);
353	#endif	468	#endif
354		469
355	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	473	outl += outl2;
359		474
360	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	477	(unsigned char *) d, l));
363	outl += outl2;	478	outl += outl2;
364		479
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	481	outl += outl2;
367		482
368	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
369		484
370	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	494	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
381	u8 *d;	496	u8 *d;
382	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
383		498
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		500
386	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
388		503
389	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	505	d = cdata;
391	else	506	else
392	#endif	507	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
394		509
395	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 )(&p->len + 1) == &(p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	518	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	520	outl += outl2;
400		521
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	523	outl += outl2;
403		524
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	525	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		526
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	552	}
432	};	553	};
433		554
434	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
435	{	556	{
436	// actually, hmaclen cannot be checked because the hmac	557	u8 serial[SERIAL_SIZE];
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	558	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	559	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	560	u32 cipher_nid, mac_nid, auth_nid;
442		561
443	const u8 curflags () const	562	void setup (ptype type, int dst);
		563	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		564
		565	static u8 get_features ()
444	{	566	{
		567	u8 f = 0;
		568	#if ENABLE_COMPRESSION
		569	f \|= FEATURE_COMPRESSION;
		570	#endif
		571	#if ENABLE_ROHC
		572	f \|= FEATURE_ROHC;
		573	#endif
		574	#if ENABLE_BRIDGING
		575	f \|= FEATURE_BRIDGING;
		576	#endif
445	return 0x80	577	return f;
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	578	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	579	};
452		580
		581	void
453	void config_packet::setup (ptype type, int dst)	582	config_packet::setup (ptype type, int dst)
454	{	583	{
455	prot_major = PROTOCOL_MAJOR;	584	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	585	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	586	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	587	flags = 0;
459	flags = curflags ();	588	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		589
		590	strncpy ((char *)serial, conf.serial, sizeof (serial));
		591
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	592	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	593	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		594	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		595
466	len = sizeof (*this) - sizeof (net_packet);	596	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	597	set_hdr (type, dst);
468	}	598	}
469		599
470	bool config_packet::chk_config () const	600	bool
		601	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	602	{
472	return prot_major == PROTOCOL_MAJOR	603	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	604	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	605	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()	606	else if (randsize != RAND_SIZE)
476	&& challengelen == sizeof (rsachallenge)	607	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		608	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	609	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	610	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	611	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	612	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		613	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		614	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		615	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		616	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		617	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		618	else
		619	{
		620	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		621
		622	if (cmp > 0)
		623	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		624	conf->nodename, (const char *)rsi);
		625	else if (cmp == 0)
		626	return true;
		627	}
		628
		629	return false;
		630	}
		631
482	struct auth_req_packet : config_packet	632	struct auth_req_packet : config_packet // UNPROTECTED
483	{	633	{
484	char magic[8];	634	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	635	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	636	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	637	u8 pad2, pad3;
488	rsaid id;	638	auth_encr encr;
489	rsaencrdata encr;
490		639
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	640	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	641	{
493	config_packet::setup (PT_AUTH_REQ, dst);	642	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	643	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	644	initiate = !!initiate_;
496	protocols = protocols_;	645	protocols = protocols_;
497		646
498	len = sizeof (*this) - sizeof (net_packet);	647	len = sizeof (*this) - sizeof (net_packet);
499	}	648	}
500	};	649	};
501		650
502	struct auth_res_packet : config_packet	651	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	652	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	653	auth_response response;
508		654
509	auth_res_packet (int dst)	655	auth_res_packet (int dst)
510	{	656	{
511	config_packet::setup (PT_AUTH_RES, dst);	657	set_hdr (PT_AUTH_RES, dst);
512		658
513	len = sizeof (*this) - sizeof (net_packet);	659	len = sizeof (*this) - sizeof (net_packet);
514	}	660	}
515	};	661	};
516		662
…		…
546	};	692	};
547		693
548	/////////////////////////////////////////////////////////////////////////////	694	/////////////////////////////////////////////////////////////////////////////
549		695
550	void	696	void
		697	connection::connection_established (const sockinfo &rsi)
		698	{
		699	if (!have_snd_auth \|\| !have_rcv_auth)
		700	return;
		701
		702	si = rsi;
		703	protocol = rsi.prot;
		704
		705	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		706	conf->nodename, (const char *)rsi,
		707	is_direct ? "direct" : "forwarded",
		708	PROTOCOL_MAJOR, prot_minor);
		709
		710	if (::conf.script_node_up)
		711	{
		712	run_script_cb *cb = new run_script_cb;
		713	cb->set<connection, &connection::script_node_up> (this);
		714	run_script_queued (cb, _("node-up command execution failed, continuing."));
		715	}
		716
		717	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		718	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		719
		720	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		721	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		722
		723	oiv.reset ();
		724
		725	// make sure rekeying timeouts are slightly asymmetric
		726	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		727	rekey.start (rekey_interval, rekey_interval);
		728
		729	keepalive.start (::conf.keepalive);
		730
		731	// send queued packets
		732	if (ictx && octx)
		733	{
		734	while (tap_packet p = (tap_packet )data_queue.get ())
		735	{
		736	if (p->len) send_data_packet (p);
		737	delete p;
		738	}
		739
		740	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		741	{
		742	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		743	delete p;
		744	}
		745	}
		746
		747	vpn->connection_established (this);
		748	}
		749
		750	void
551	connection::reset_dstaddr ()	751	connection::reset_si ()
552	{	752	{
		753	if (vpn->can_direct (THISNODE, conf))
		754	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		755	else
		756	{
		757	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		758	protocol = 0;
		759	}
		760
553	si.set (conf);	761	si.set (conf, protocol);
		762
		763	is_direct = si.valid ();
		764	}
		765
		766	// ensure sockinfo is valid, forward if necessary
		767	const sockinfo &
		768	connection::forward_si (const sockinfo &si) const
		769	{
		770	if (!si.valid ())
		771	{
		772	connection *r = vpn->find_router_for (this);
		773
		774	if (r)
		775	{
		776	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		777	conf->nodename, r->conf->nodename);
		778	return r->si;
		779	}
		780	else
		781	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		782	conf->nodename);
		783	}
		784
		785	return si;
		786	}
		787
		788	void
		789	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		790	{
		791	if (!vpn->send_vpn_packet (pkt, si, tos))
		792	reset_connection ();
554	}	793	}
555		794
556	void	795	void
557	connection::send_ping (const sockinfo &si, u8 pong)	796	connection::send_ping (const sockinfo &si, u8 pong)
558	{	797	{
559	ping_packet *pkt = new ping_packet;	798	ping_packet *pkt = new ping_packet;
560		799
561	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	800	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		801
		802	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	803	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563		804
564	delete pkt;	805	delete pkt;
565	}	806	}
566		807
…		…
581	void	822	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)	823	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{	824	{
584	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	825	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585		826
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	827	generate_auth_data ();
		828	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
587		829
588	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591
592	if (protocol)
593	{
594	rsachallenge chg;
595
596	rsa_cache.gen (pkt->id, chg);
597
598	if (0 > RSA_public_encrypt (sizeof chg,
599	(unsigned char )&chg, (unsigned char )&pkt->encr,
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
601	fatal ("RSA_public_encrypt error");
602
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	830	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
604
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	831	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
606		832
607	delete pkt;	833	delete pkt;
608	}
609	else
610	; // silently fail
611	}	834	}
612		835
613	void	836	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	837	connection::send_auth_response (const sockinfo &si)
615	{	838	{
616	auth_res_packet *pkt = new auth_res_packet (conf->id);	839	auth_res_packet *pkt = new auth_res_packet (conf->id);
617		840
618	pkt->id = id;	841	auth_hash (rcv_auth, pkt->response.mac);
		842	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
619		843
620	rsa_hash (id, chg, pkt->response);
621
622	pkt->hmac_set (octx);
623
624	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	844	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
625
626	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	845	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
627		846
628	delete pkt;	847	delete pkt;
629	}	848	}
630		849
631	void	850	void
632	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	851	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
633	{	852	{
634	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	853	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
635	conf->id, rid, (const char *)rsi);	854	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		855	conf->protocols);
636		856
637	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	857	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
638		858
639	r->hmac_set (octx);	859	r->hmac_set (octx);
640	send_vpn_packet (r, si);	860	send_vpn_packet (r, si);
641		861
642	delete r;	862	delete r;
643	}	863	}
644		864
645	void	865	inline void
646	connection::establish_connection_cb (tstamp &ts)	866	connection::establish_connection_cb (ev::timer &w, int revents)
647	{	867	{
648	if (ictx \|\| conf == THISNODE	868	if (!(ictx && octx)
		869	&& conf != THISNODE
649	\|\| connectmode == conf_node::C_NEVER	870	&& connectmode != conf_node::C_NEVER
650	\|\| connectmode == conf_node::C_DISABLED)	871	&& connectmode != conf_node::C_DISABLED
651	ts = TSTAMP_CANCEL;	872	&& !w.is_active ())
652	else if (ts <= NOW)
653	{	873	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	874	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
655		875	// and stop trying. should probably be handled by a per-connection expire handler.
656	if (retry_int < 3600 * 8)	876	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
657	retry_cnt++;
658
659	ts = NOW + retry_int;
660
661	if (conf->hostname)
662	{	877	{
663	reset_dstaddr ();	878	reset_connection ();
664	if (si.host && auth_rate_limiter.can (si))	879	return;
665	{
666	if (retry_cnt < 4)
667	send_auth_request (si, true);
668	else
669	send_ping (si, 0);
670	}	880	}
		881
		882	last_establish_attempt = ev_now ();
		883
		884	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		885	? (retry_cnt & 3) + 1
		886	: 1 << (retry_cnt >> 2));
		887
		888	reset_si ();
		889
		890	bool slow = si.prot & PROT_SLOW;
		891
		892	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		893	{
		894	/TODO/ /* start the timer so we don't recurse endlessly */
		895	w.start (1);
		896	vpn->send_connect_request (this);
671	}	897	}
672	else	898	else
673	vpn->connect_request (conf->id);	899	{
		900	if (si.valid ())
		901	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		902	conf->nodename, (const char *)si);
		903
		904	const sockinfo &dsi = forward_si (si);
		905
		906	slow = slow \|\| (dsi.prot & PROT_SLOW);
		907
		908	if (dsi.valid () && auth_rate_limiter.can (dsi))
		909	{
		910	if (retry_cnt < 4)
		911	send_auth_request (dsi, true);
		912	else
		913	send_ping (dsi, 0);
		914	}
		915	}
		916
		917	retry_int *= slow ? 8. : 0.9;
		918
		919	if (retry_int < conf->max_retry)
		920	retry_cnt++;
		921	else
		922	retry_int = conf->max_retry;
		923
		924	w.start (retry_int);
674	}	925	}
675	}	926	}
676		927
677	void	928	void
678	connection::reset_connection ()	929	connection::reset_connection ()
…		…
681	{	932	{
682	slog (L_INFO, _("%s(%s): connection lost"),	933	slog (L_INFO, _("%s(%s): connection lost"),
683	conf->nodename, (const char *)si);	934	conf->nodename, (const char *)si);
684		935
685	if (::conf.script_node_down)	936	if (::conf.script_node_down)
686	run_script (run_script_cb (this, &connection::script_node_down), false);	937	{
		938	run_script_cb *cb = new run_script_cb;
		939	cb->set<connection, &connection::script_node_down> (this);
		940	run_script_queued (cb, _("node-down command execution failed, continuing."));
		941	}
687	}	942	}
688		943
689	delete ictx; ictx = 0;	944	delete ictx; ictx = 0;
690	delete octx; octx = 0;	945	delete octx; octx = 0;
691		946
692	si.host= 0;	947	si.host = 0;
693		948
		949	have_snd_auth = false;
		950	have_rcv_auth = false;
		951	auth_expire = 0.;
		952
694	last_activity = 0;	953	last_activity = 0.;
		954	//last_si_change = 0.;
695	retry_cnt = 0;	955	retry_cnt = 0;
696		956
697	rekey.reset ();	957	rekey.stop ();
698	keepalive.reset ();	958	keepalive.stop ();
699	establish_connection.reset ();	959	establish_connection.stop ();
700	}	960	}
701		961
702	void	962	void
703	connection::shutdown ()	963	connection::shutdown ()
704	{	964	{
…		…
706	send_reset (si);	966	send_reset (si);
707		967
708	reset_connection ();	968	reset_connection ();
709	}	969	}
710		970
711	void	971	// poor-man's rekeying
712	connection::rekey_cb (tstamp &ts)	972	inline void
		973	connection::rekey_cb (ev::timer &w, int revents)
713	{	974	{
714	ts = TSTAMP_CANCEL;
715
716	reset_connection ();	975	reset_connection ();
717	establish_connection ();	976	establish_connection ();
718	}	977	}
719		978
720	void	979	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	980	connection::send_data_packet (tap_packet *pkt)
722	{	981	{
723	vpndata_packet *p = new vpndata_packet;	982	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	983	int tos = 0;
725		984
726	if (conf->inherit_tos	985	// I am not hilarious about peeking into packets, but so be it.
727	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	986	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	987	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		988
731	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	989	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
732	send_vpn_packet (p, si, tos);	990	send_vpn_packet (p, si, tos);
733		991
734	delete p;	992	delete p;
735		993
736	if (oseqno > MAX_SEQNO)	994	if (oseqno > MAX_SEQNO)
737	rekey ();	995	rekey ();
738	}	996	}
739		997
740	void	998	void
		999	connection::post_inject_queue ()
		1000	{
		1001	// force a connection every now and when when packets are sent (max 1/s)
		1002	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		1003	establish_connection.stop ();
		1004
		1005	establish_connection ();
		1006	}
		1007
		1008	void
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1009	connection::inject_data_packet (tap_packet *pkt)
742	{	1010	{
743	if (ictx && octx)	1011	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	1012	send_data_packet (pkt);
745	else	1013	else
746	{	1014	{
747	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	1015	data_queue.put (new tap_packet (*pkt));
		1016	post_inject_queue ();
		1017	}
		1018	}
749		1019
750	establish_connection ();	1020	void
		1021	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1022	{
		1023	if (ictx && octx)
		1024	send_vpn_packet (pkt, si, tos);
		1025	else
		1026	{
		1027	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		1028	post_inject_queue ();
751	}	1029	}
752	}	1030	}
753		1031
754	void	1032	void
755	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1033	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
756	{	1034	{
757	last_activity = NOW;	1035	last_activity = ev_now ();
758		1036
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1037	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1038	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1039
		1040	if (connectmode == conf_node::C_DISABLED)
		1041	return;
761		1042
762	switch (pkt->typ ())	1043	switch (pkt->typ ())
763	{	1044	{
764	case vpn_packet::PT_PING:	1045	case vpn_packet::PT_PING:
		1046	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1047
765	// we send pings instead of auth packets after some retries,	1048	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	1049	// so reset the retry counter and establish a connection
767	// when we receive a ping.	1050	// when we receive a ping.
768	if (!ictx)	1051	if (!ictx)
769	{	1052	{
770	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
771	send_auth_request (rsi, true);	1054	send_auth_request (rsi, true);
772	}	1055	}
773	else	1056	else
		1057	// we would love to change the socket address here, but ping's aren't
		1058	// authenticated, so we best ignore it.
774	send_ping (rsi, 1); // pong	1059	send_ping (rsi, 1); // pong
775		1060
776	break;	1061	break;
777		1062
778	case vpn_packet::PT_PONG:	1063	case vpn_packet::PT_PONG:
		1064	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1065
		1066	// a PONG might mean that the other side doesn't really know
		1067	// about our desire for communication.
		1068	establish_connection ();
779	break;	1069	break;
780		1070
781	case vpn_packet::PT_RESET:	1071	case vpn_packet::PT_RESET:
782	{	1072	{
783	reset_connection ();	1073	reset_connection ();
784		1074
785	config_packet p = (config_packet ) pkt;	1075	config_packet p = (config_packet ) pkt;
786		1076
787	if (!p->chk_config ())	1077	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
788	{
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
790	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;
792	}
793	else if (connectmode == conf_node::C_ALWAYS)
794	establish_connection ();	1078	establish_connection ();
795	}	1079	}
796	break;	1080	break;
797		1081
798	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
799	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
800	{	1084	{
801	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
802		1086
803	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
804		1090
805	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (memcmp (p->magic, MAGIC, 8))
		1092	{
		1093	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1094	conf->nodename, (const char *)rsi);
		1095	}
		1096	else if (p->chk_config (conf, rsi))
806	{	1097	{
807	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
808	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1099	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
809	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
811		1102
812	if (p->initiate)	1103	if (p->initiate)
813	send_auth_request (rsi, false);	1104	send_auth_request (rsi, false);
814		1105
815	rsachallenge k;	1106	auth_data auth;
816		1107
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	1108	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
818	(unsigned char )&p->encr, (unsigned char )&k,	1109	{
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1110	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
821	conf->nodename, (const char *)rsi);	1111	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1112	}
822	else	1113	else
823	{	1114	{
824	retry_cnt = 0;	1115	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
825	establish_connection.set (NOW + 8); //? ;)
826	keepalive.reset ();
827	rekey.reset ();
828		1116
829	delete ictx;
830	ictx = 0;	1117	rcv_auth = auth;
		1118	have_rcv_auth = true;
831		1119
832	delete octx;	1120	send_auth_response (rsi);
833		1121
834	octx = new crypto_ctx (k, 1);	1122	if (chg)
835	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1123	{
836
837	conf->protocols = p->protocols;	1124	conf->protocols = p->protocols;
838	send_auth_response (rsi, p->id, k);	1125	features = p->features & config_packet::get_features ();
839		1126
		1127	connection_established (rsi);
840	break;	1128	}
841	}	1129	}
		1130
		1131	break;
842	}	1132	}
843		1133
844	send_reset (rsi);	1134	send_reset (rsi);
845	}	1135	}
846		1136
847	break;	1137	break;
848		1138
849	case vpn_packet::PT_AUTH_RES:	1139	case vpn_packet::PT_AUTH_RES:
850	{	1140	{
851	auth_res_packet p = (auth_res_packet ) pkt;	1141	auth_res_packet p = (auth_res_packet )pkt;
852		1142
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1143	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
854		1144
855	if (p->chk_config ())	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
856	{	1146	{
857	if (p->prot_minor != PROTOCOL_MINOR)
858	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
859	conf->nodename, (const char *)rsi,
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861
862	rsachallenge chg;
863
864	if (!rsa_cache.find (p->id, chg))
865	slog (L_ERR, _("%s(%s): unrequested auth response"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
866	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
867	else
868	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);
870
871	if (!p->hmac_chk (cctx))
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),
874	conf->nodename, (const char *)rsi);
875	else
876	{
877	rsaresponse h;
878
879	rsa_hash (p->id, chg, h);
880
881	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
882	{
883	prot_minor = p->prot_minor;
884
885	delete ictx; ictx = cctx;
886
887	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888
889	si = rsi;
890
891	rekey.set (NOW + ::conf.rekey);
892	keepalive.set (NOW + ::conf.keepalive);
893
894	// send queued packets
895	while (tap_packet *p = queue.get ())
896	{
897	send_data_packet (p);
898	delete p;
899	}
900
901	connectmode = conf->connectmode;
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910
911	break;
912	}
913	else
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
915	conf->nodename, (const char *)rsi);
916	}
917
918	delete cctx;
919	}
920	}	1149	}
		1150	else if (!have_snd_auth)
		1151	{
		1152	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1153
		1154	have_snd_auth = true;
		1155	connection_established (rsi);
		1156	}
		1157
		1158	break;
921	}	1159	}
922		1160
923	send_reset (rsi);	1161	send_reset (rsi);
924	break;	1162	break;
925		1163
…		…
933		1171
934	if (ictx && octx)	1172	if (ictx && octx)
935	{	1173	{
936	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
937		1175
938	if (rsi == si)	1176	if (!p->hmac_chk (ictx))
		1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1178	"could be an attack, or just corruption or a synchronization error."),
		1179	conf->nodename, (const char *)rsi);
		1180	else
939	{	1181	{
940	if (!p->hmac_chk (ictx))
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942	"could be an attack, or just corruption or an synchronization error"),
943	conf->nodename, (const char *)rsi);
944	else	1182	u32 seqno;
		1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
		1185
		1186	if (seqclass == 0) // ok
945	{	1187	{
946	u32 seqno;	1188	vpn->tap->send (d);
947	tap_packet *d = p->unpack (this, seqno);
948		1189
949	if (iseqno.recv_ok (seqno))	1190	if (si != rsi)
950	{	1191	{
951	vpn->tap->send (d);	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
		1194	// {
		1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1196	conf->nodename, (const char )si, (const char )rsi);
952		1197
953	if (p->dst () == 0) // re-broadcast	1198	si = rsi;
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1199
		1200	if (::conf.script_node_change)
955	{	1201	{
956	connection c = i;	1202	run_script_cb *cb = new run_script_cb;
957		1203	cb->set<connection, &connection::script_node_change> (this);
958	if (c->conf != THISNODE && c->conf != conf)	1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
959	c->inject_data_packet (d);
960	}	1205	}
961		1206
		1207	// }
962	delete d;	1208	//else
963		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
964	break;	1210	// conf->nodename, (const char )si, (const char )rsi);
965	}	1211	}
966	}	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;
967	}	1228	}
968	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970	}	1229	}
971		1230
972	send_reset (rsi);	1231	send_reset (rsi);
973	break;	1232	break;
974		1233
975	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1236	{
978	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
979		1238
980	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 ())
981	conf->protocols = p->protocols;
982	connection *c = vpn->conns[p->id - 1];
983
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);
986
987	if (c->ictx && c->octx)
988	{	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	{
989	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
992	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 ();
993	}	1258	}
		1259	else
		1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
994	}	1263	}
995		1264
996	break;	1265	break;
997		1266
998	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1269	{
1001	connect_info_packet p = (connect_info_packet ) pkt;	1270	connect_info_packet p = (connect_info_packet )pkt;
1002		1271
1003	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 ())
1004	conf->protocols = p->protocols;	1273	{
1005	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1006		1275
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1276	c->conf->protocols = p->protocols;
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1278	p->si.upgrade_protocol (protocol, c->conf);
1009		1279
		1280	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		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);
		1288
		1289	const sockinfo &dsi = forward_si (p->si);
		1290
		1291	if (dsi.valid ())
1010	c->send_auth_request (p->si, 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);
1011	}	1302	}
1012		1303
1013	break;	1304	break;
1014		1305
1015	default:	1306	default:
1016	send_reset (rsi);	1307	send_reset (rsi);
1017	break;	1308	break;
1018	}	1309	}
1019	}	1310	}
1020		1311
1021	void connection::keepalive_cb (tstamp &ts)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1022	{	1314	{
1023	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)
1024	{	1320	{
1025	reset_connection ();	1321	reset_connection ();
1026	establish_connection ();	1322	establish_connection ();
1027	}	1323	}
1028	else if (NOW < last_activity + ::conf.keepalive)
1029	ts = last_activity + ::conf.keepalive;
1030	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1031	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1032	{	1326	{
		1327	w.start (3);
1033	send_ping (si);	1328	send_ping (si);
1034	ts = NOW + 5;
1035	}	1329	}
		1330	else if (when >= -10)
		1331	// hold ondemand connections implicitly a few seconds longer
		1332	// should delete octx, though, or something like that ;)
		1333	w.start (when + 10);
1036	else	1334	else
1037	reset_connection ();	1335	reset_connection ();
1038	}	1336	}
1039		1337
		1338	void
1040	void connection::connect_request (int id)	1339	connection::send_connect_request (int id)
1041	{	1340	{
1042	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);
1043		1342
1044	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);
1045	p->hmac_set (octx);	1346	p->hmac_set (octx);
1046	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1047		1348
1048	delete p;	1349	delete p;
1049	}	1350	}
1050		1351
1051	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1052	{	1354	{
1053	vpn->script_if_up ();
1054
1055	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;
1056	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);
1057	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1058	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1059	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1060	}	1374	}
1061		1375
		1376	inline const char *
1062	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1063	{	1378	{
1064	script_node ();	1379	script_init_connect_env ();
1065		1380
1066	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1067		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1068	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1069	}
1070		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 *
1071	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1072	{	1410	{
1073	script_node ();	1411	script_init_connect_env ();
1074		1412
1075	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1076		1414
1077	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1078	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1079		1420
1080	// send a vpn packet out to other hosts	1421	return filename;
1081	void
1082	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1083	{
1084	switch (protocol)
1085	{
1086	case PROT_IPv4:
1087	vpn->send_ipv4_packet (pkt, si, tos);
1088	break;
1089
1090	case PROT_UDPv4:
1091	vpn->send_udpv4_packet (pkt, si, tos);
1092	break;
1093
1094	case PROT_TCPv4:
1095	vpn->send_tcpv4_packet (pkt, si, tos);
1096	break;
1097	}
1098	}	1422	}
1099		1423
1100	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn vpn, conf_node conf)
1101	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1102	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1103	, 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);
1104	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1105	{	1435
		1436	last_establish_attempt = 0.;
1106	octx = ictx = 0;	1437	octx = ictx = 0;
1107	retry_cnt = 0;
1108		1438
1109	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
1110	reset_connection ();	1445	reset_connection ();
1111	}	1446	}
1112		1447
1113	connection::~connection ()	1448	connection::~connection ()
1114	{	1449	{
1115	shutdown ();	1450	shutdown ();
1116	}	1451	}
1117		1452
		1453	void
1118	void connection_init ()	1454	connection_init ()
1119	{	1455	{
1120	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1121	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1122	}	1458	}
1123		1459

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Comparing gvpe/src/connection.C (file contents): Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs. Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC