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Comparing gvpe/src/connection.C (file contents):
Revision 1.63 by pcg, Sun Dec 2 00:45:41 2007 UTC vs.
Revision 1.108 by root, Fri Oct 11 04:07:24 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
30		50
31	#include "conf.h"	51	#include "conf.h"
32	#include "slog.h"	52	#include "slog.h"
33	#include "device.h"	53	#include "device.h"
34	#include "vpn.h"	54	#include "vpn.h"
35	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
36		57
37	#include "netcompat.h"	58	#include "netcompat.h"
38		59
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
44		62
45	#define ULTRA_FAST 1	63	#define ULTRA_FAST 1
46	#define HLOG 15	64	#define HLOG 15
47	#include "lzf/lzf.h"	65	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	66	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	67	#include "lzf/lzf_d.c"
50		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb *cb, const char *warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
		112
51	struct crypto_ctx	113	struct crypto_ctx
52	{	114	{
53	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	116	HMAC_CTX hctx;
55		117
56	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	119	~crypto_ctx ();
58	};	120	};
59		121
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
62	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	154	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	155	}
67		156
68	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
69	{	158	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
72	}	161	}
73		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
74	static void	190	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	192	{
77	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	197	}
86		198
87	struct rsa_entry	199	void
		200	connection::generate_auth_data ()
88	{	201	{
89	tstamp expire;	202	if (auth_expire < ev_now ())
90	rsaid id;
91	rsachallenge chg;
92	};
93
94	struct rsa_cache : list<rsa_entry>
95	{
96	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
97
98	bool find (const rsaid &id, rsachallenge &chg)
99	{
100	for (iterator i = begin (); i != end (); ++i)
101	{	203	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	204	// request data
103	{	205	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
105		207
106	erase (i);	208	// eventual response data
107	return true;	209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	210	}
110		211
111	if (!cleaner.is_active ())	212	// every use prolongs the expiry
112	cleaner.again ();
113
114	return false;
115	}
116
117	void gen (rsaid &id, rsachallenge &chg)
118	{
119	rsa_entry e;
120
121	RAND_bytes ((unsigned char *)&id, sizeof id);
122	RAND_bytes ((unsigned char *)&chg, sizeof chg);
123
124	e.expire = ev_now () + RSA_TTL;	213	auth_expire = ev_now () + AUTH_TTL;
125	e.id = id;
126	memcpy (&e.chg, &chg, sizeof chg);
127
128	push_back (e);
129
130	if (!cleaner.is_active ())
131	cleaner.again ();
132	}
133
134	rsa_cache ()
135	: cleaner (this, &rsa_cache::cleaner_cb)
136	{
137	cleaner.set (RSA_TTL, RSA_TTL);
138	}
139
140	} rsa_cache;
141
142	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
143	{
144	if (empty ())
145	w.stop ();
146	else
147	{
148	for (iterator i = begin (); i != end (); )
149	if (i->expire <= ev_now ())
150	i = erase (i);
151	else
152	++i;
153	}
154	}	214	}
155		215
156	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
157		217
158	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
159	{	220	{
160	if (queue[i])	221	queue = new pkt [max_queue];
161	{
162	delete queue[i];
163	j = (j + 1) % QUEUEDEPTH;
164	}
165		222
166	queue[i] = p;
167
168	i = (i + 1) % QUEUEDEPTH;
169	}
170
171	net_packet *pkt_queue::get ()
172	{
173	net_packet *p = queue[j];
174
175	if (p)
176	{
177	queue[j] = 0;
178	j = (j + 1) % QUEUEDEPTH;
179	}
180
181	return p;
182	}
183
184	pkt_queue::pkt_queue ()
185	{
186	memset (queue, 0, sizeof (queue));
187	i = 0;	223	i = 0;
188	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
189	}	227	}
190		228
191	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
192	{	230	{
193	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
194	delete queue[i];	234	delete [] queue;
		235	}
		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
195	}	291	}
196		292
197	struct net_rateinfo	293	struct net_rateinfo
198	{	294	{
199	u32 host;	295	u32 host;
…		…
213		309
214	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	311	bool can (u32 host);
216	};	312	};
217		313
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		315
		316	bool
220	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
221	{	318	{
222	iterator i;	319	iterator i;
223		320
224	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
225	if (i->host == host)	322	if (i->host == host)
…		…
270	}	367	}
271	}	368	}
272		369
273	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
274		371
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	374	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
282		376
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	380	}
288		381
289	void	382	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	384	{
292	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		386	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	388	}
296		389
297	bool	390	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	392	{
300	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		394	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
303	}	396	}
304		397
		398	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	400	{
307	type = type_;	401	type = type_;
308		402
309	int src = THISNODE->id;	403	int src = THISNODE->id;
310		404
…		…
315		409
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		412
319	struct vpndata_packet : vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		418	tap_packet *unpack (connection *conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
320	{	422	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
322
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	424	}
		425	};
332		426
333	void	427	void
334	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
335	{	429	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
339		433
340	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
342		436
343	if (conn->features & ENABLE_COMPRESSION)	437	if (conn->features & FEATURE_COMPRESSION)
344	{	438	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		440
347	if (cl)	441	if (cl)
348	{	442	{
…		…
354	d[1] = cl;	448	d[1] = cl;
355	}	449	}
356	}	450	}
357	#endif	451	#endif
358		452
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
360		454
361	struct {	455	struct {
362	#if RAND_SIZE	456	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
364	#endif	458	#endif
365	u32 seqno;	459	u32 seqno;
366	} datahdr;	460	} datahdr;
367		461
368	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE	463	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
371	#endif	467	#endif
372		468
373	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
397	int outl = 0, outl2;	493	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
399	u8 *d;	495	u8 *d;
400	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
401		497
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
403		499
404	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
406		502
407	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	504	d = cdata;
409	else	505	else
410	#endif	506	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
412		508
413	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	517	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	518	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	519	outl += outl2;
418		520
…		…
449	}	551	}
450	};	552	};
451		553
452	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
453	{	555	{
454	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
460		560
461	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
462	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		563
464	static u8 get_features ()	564	static u8 get_features ()
465	{	565	{
466	u8 f = 0;	566	u8 f = 0;
467	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
…		…
475	#endif	575	#endif
476	return f;	576	return f;
477	}	577	}
478	};	578	};
479		579
		580	void
480	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
481	{	582	{
482	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
483	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
484	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
485	hmaclen = HMACLENGTH;
486	flags = 0;	586	flags = 0;
487	challengelen = sizeof (rsachallenge);
488	features = get_features ();	587	features = get_features ();
489		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
490	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
491	digest_nid = htonl (EVP_MD_type (RSA_HASH));
492	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
493		594
494	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
495	set_hdr (type, dst);	596	set_hdr (type, dst);
496	}	597	}
497		598
498	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
499	{	601	{
500	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
501	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
502	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
503	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
504	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
505	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
506	else if (challengelen != sizeof (rsachallenge))
507	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
508	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
509	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
510	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
511	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
512	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
513	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
514	else	617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
515	return true;	625	return true;
		626	}
516		627
517	return false;	628	return false;
518	}	629	}
519		630
520	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
521	{	632	{
522	char magic[8];	633	char magic[8];
523	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
524	u8 protocols; // supported protocols (will be patched on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
525	u8 pad2, pad3;	636	u8 pad2, pad3;
526	rsaid id;	637	auth_encr encr;
527	rsaencrdata encr;
528		638
529	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
530	{	640	{
531	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
532	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
533	initiate = !!initiate_;	643	initiate = !!initiate_;
534	protocols = protocols_;	644	protocols = protocols_;
535		645
536	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
537	}	647	}
538	};	648	};
539		649
540	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
541	{	651	{
542	rsaid id;
543	u8 pad1, pad2, pad3;
544	u8 response_len; // encrypted length
545	rsaresponse response;	652	auth_response response;
546		653
547	auth_res_packet (int dst)	654	auth_res_packet (int dst)
548	{	655	{
549	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
550		657
551	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
552	}	659	}
553	};	660	};
554		661
…		…
584	};	691	};
585		692
586	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
587		694
588	void	695	void
589	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
590	{	697	{
591	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	698	if (!have_snd_auth || !have_rcv_auth)
		699	return;
592		700
593	if (ictx && octx)	701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
594	{	714	}
595	connectmode = conf->connectmode;	715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
596		718
		719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
597	// make sure rekeying timeouts are slightly asymmetric	724	// make sure rekeying timeouts are slightly asymmetric
598	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
599	rekey.start (rekey_interval, rekey_interval);	726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
600	keepalive.start (::conf.keepalive);	730	keepalive.start (::conf.keepalive);
601		731
602	// send queued packets	732	// send queued packets
603	if (ictx && octx)
604	{
605	while (tap_packet *p = (tap_packet *)data_queue.get ())	733	while (tap_packet *p = (tap_packet *)data_queue.get ())
606	{	734	{
607	send_data_packet (p);	735	if (p->len) send_data_packet (p);
608	delete p;	736	delete p;
609	}	737	}
610		738
611	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612	{	740	{
613	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
614	delete p;	742	delete p;
615	}
616	}
617	}	743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
		749	connection::reset_si ()
		750	{
		751	if (vpn->can_direct (THISNODE, conf))
		752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
618	else	753	else
619	{	754	{
620	retry_cnt = 0;
621	establish_connection.start (5);
622	keepalive.stop ();
623	rekey.stop ();
624	}
625	}
626
627	void
628	connection::reset_si ()
629	{
630	protocol = best_protocol (THISNODE->protocols & conf->protocols);
631
632	// mask out protocols we cannot establish
633	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
634	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
635	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
636
637	if (protocol
638	&& (!conf->can_direct (THISNODE)
639	|| !THISNODE->can_direct (conf)))
640	{
641	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
642	protocol = 0;	756	protocol = 0;
643	}	757	}
644		758
645	si.set (conf, protocol);	759	si.set (conf, protocol);
646	}	760	}
…		…
649	const sockinfo &	763	const sockinfo &
650	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
651	{	765	{
652	if (!si.valid ())	766	if (!si.valid ())
653	{	767	{
654	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
655		769
656	if (r)	770	if (r)
657	{	771	{
658	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659	conf->nodename, r->conf->nodename, (const char *)r->si);	773	conf->nodename, r->conf->nodename);
660	return r->si;	774	return r->si;
661	}	775	}
662	else	776	else
663	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
664	conf->nodename);	778	conf->nodename);
665	}	779	}
666		780
667	return si;	781	return si;
668	}	782	}
669		783
670	void	784	void
671	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
672	{	786	{
673	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
674	reset_connection ();	788	reset_connection ("packet send error");
675	}	789	}
676		790
677	void	791	void
678	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
679	{	793	{
680	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
681		795
682	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	796	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		797
		798	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
683	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684		800
685	delete pkt;	801	delete pkt;
686	}	802	}
687		803
…		…
702	void	818	void
703	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
704	{	820	{
705	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
706		822
707	rsachallenge chg;	823	generate_auth_data ();
708	rsa_cache.gen (pkt->id, chg);
709	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
710		825
711	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
712
713	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
714		828
715	delete pkt;	829	delete pkt;
716	}	830	}
717		831
718	void	832	void
719	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
720	{	834	{
721	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
722		836
723	pkt->id = id;	837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
724		839
725	rsa_hash (id, chg, pkt->response);
726
727	pkt->hmac_set (octx);
728
729	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
730
731	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
732		842
733	delete pkt;	843	delete pkt;
734	}	844	}
735		845
736	void	846	void
737	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738	{	848	{
739	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
740	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
741		852
742	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
743		854
744	r->hmac_set (octx);	855	r->hmac_set (octx);
745	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
746		857
747	delete r;	858	delete r;
748	}	859	}
749		860
750	void	861	inline void
751	connection::establish_connection_cb (ev::timer &w, int revents)	862	connection::establish_connection_cb (ev::timer &w, int revents)
752	{	863	{
753	if (!ictx	864	if (!(ictx && octx)
754	&& conf != THISNODE	865	&& conf != THISNODE
755	&& connectmode != conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
756	&& connectmode != conf_node::C_DISABLED	867	&& connectmode != conf_node::C_DISABLED
757	&& !w.is_active ())	868	&& !w.is_active ())
758	{	869	{
		870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		871	// and stop trying. should probably be handled by a per-connection expire handler.
		872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
		875	return;
		876	}
		877
		878	last_establish_attempt = ev_now ();
		879
759	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760	? (retry_cnt & 3) + 1	881	? (retry_cnt & 3) + 1
761	: 1 << (retry_cnt >> 2));	882	: 1 << (retry_cnt >> 2));
762		883
763	reset_si ();	884	reset_si ();
764		885
765	bool slow = si.prot & PROT_SLOW;	886	bool slow = si.prot & PROT_SLOW;
766		887
767	if (si.prot && !si.host)	888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
768	{	889	{
769	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770	/*TODO*/ /* start the timer so we don't recurse endlessly */	890	/*TODO*/ /* start the timer so we don't recurse endlessly */
771	w.start (1);	891	w.start (1);
772	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
773	}	893	}
774	else	894	else
775	{	895	{
776	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
777		899
778	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
779		901
780	slow = slow || (dsi.prot & PROT_SLOW);	902	slow = slow || (dsi.prot & PROT_SLOW);
781		903
…		…
786	else	908	else
787	send_ping (dsi, 0);	909	send_ping (dsi, 0);
788	}	910	}
789	}	911	}
790		912
791	retry_int *= slow ? 8. : 0.7;	913	retry_int *= slow ? 8. : 0.9;
792		914
793	if (retry_int < conf->max_retry)	915	if (retry_int < conf->max_retry)
794	retry_cnt++;	916	retry_cnt++;
795	else	917	else
796	retry_int = conf->max_retry;	918	retry_int = conf->max_retry;
…		…
798	w.start (retry_int);	920	w.start (retry_int);
799	}	921	}
800	}	922	}
801		923
802	void	924	void
803	connection::reset_connection ()	925	connection::reset_connection (const char *reason)
804	{	926	{
805	if (ictx && octx)	927	if (ictx && octx)
806	{	928	{
807	slog (L_INFO, _("%s(%s): connection lost"),	929	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	930	conf->nodename, (const char *)si, reason);
809		931
810	if (::conf.script_node_down)	932	if (::conf.script_node_down)
811	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	933	{
		934	run_script_cb *cb = new run_script_cb;
		935	cb->set<connection, &connection::script_node_down> (this);
812	slog (L_WARN, _("node-down command execution failed, continuing."));	936	run_script_queued (cb, _("node-down command execution failed, continuing."));
		937	}
813	}	938	}
814		939
815	delete ictx; ictx = 0;	940	delete ictx; ictx = 0;
816	delete octx; octx = 0;	941	delete octx; octx = 0;
817	#if ENABLE_DNS
818	dnsv4_reset_connection ();
819	#endif
820		942
821	si.host = 0;	943	si.host = 0;
822		944
		945	have_snd_auth = false;
		946	have_rcv_auth = false;
		947	auth_expire = 0.;
		948
823	last_activity = 0;	949	last_activity = 0.;
		950	//last_si_change = 0.;
824	retry_cnt = 0;	951	retry_cnt = 0;
825		952
826	rekey.stop ();	953	rekey.stop ();
827	keepalive.stop ();	954	keepalive.stop ();
828	establish_connection.stop ();	955	establish_connection.stop ();
…		…
832	connection::shutdown ()	959	connection::shutdown ()
833	{	960	{
834	if (ictx && octx)	961	if (ictx && octx)
835	send_reset (si);	962	send_reset (si);
836		963
837	reset_connection ();	964	reset_connection ("shutdown");
838	}	965	}
839		966
840	void	967	// poor-man's rekeying
		968	inline void
841	connection::rekey_cb (ev::timer &w, int revents)	969	connection::rekey_cb (ev::timer &w, int revents)
842	{	970	{
843	reset_connection ();	971	reset_connection ("rekeying");
844	establish_connection ();	972	establish_connection ();
845	}	973	}
846		974
847	void	975	void
848	connection::send_data_packet (tap_packet *pkt)	976	connection::send_data_packet (tap_packet *pkt)
…		…
862	if (oseqno > MAX_SEQNO)	990	if (oseqno > MAX_SEQNO)
863	rekey ();	991	rekey ();
864	}	992	}
865		993
866	void	994	void
		995	connection::post_inject_queue ()
		996	{
		997	// force a connection every now and when when packets are sent (max 1/s)
		998	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		999	establish_connection.stop ();
		1000
		1001	establish_connection ();
		1002	}
		1003
		1004	void
867	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1005	connection::inject_data_packet (tap_packet *pkt)
868	{	1006	{
869	if (ictx && octx)	1007	if (ictx && octx)
870	send_data_packet (pkt);	1008	send_data_packet (pkt);
871	else	1009	else
872	{	1010	{
873	if (!broadcast)
874	data_queue.put (new tap_packet (*pkt));	1011	data_queue.put (new tap_packet (*pkt));
875		1012	post_inject_queue ();
876	establish_connection ();
877	}	1013	}
878	}	1014	}
879		1015
		1016	void
880	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1017	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
881	{	1018	{
882	if (ictx && octx)	1019	if (ictx && octx)
883	send_vpn_packet (pkt, si, tos);	1020	send_vpn_packet (pkt, si, tos);
884	else	1021	else
885	{	1022	{
886	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1023	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
887		1024	post_inject_queue ();
888	establish_connection ();
889	}	1025	}
890	}	1026	}
891		1027
892	void	1028	void
893	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1029	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
894	{	1030	{
895	last_activity = ev_now ();	1031	last_activity = ev_now ();
896		1032
897	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1033	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
898	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1034	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
899		1035
900	if (connectmode == conf_node::C_DISABLED)	1036	if (connectmode == conf_node::C_DISABLED)
901	return;	1037	return;
902		1038
903	switch (pkt->typ ())	1039	switch (pkt->typ ())
904	{	1040	{
905	case vpn_packet::PT_PING:	1041	case vpn_packet::PT_PING:
		1042	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1043
906	// we send pings instead of auth packets after some retries,	1044	// we send pings instead of auth packets after some retries,
907	// so reset the retry counter and establish a connection	1045	// so reset the retry counter and establish a connection
908	// when we receive a ping.	1046	// when we receive a ping.
909	if (!ictx)	1047	if (!ictx)
910	{	1048	{
911	if (auth_rate_limiter.can (rsi))	1049	if (auth_rate_limiter.can (rsi))
912	send_auth_request (rsi, true);	1050	send_auth_request (rsi, true);
913	}	1051	}
914	else	1052	else
		1053	// we would love to change the socket address here, but ping's aren't
		1054	// authenticated, so we best ignore it.
915	send_ping (rsi, 1); // pong	1055	send_ping (rsi, 1); // pong
916		1056
917	break;	1057	break;
918		1058
919	case vpn_packet::PT_PONG:	1059	case vpn_packet::PT_PONG:
		1060	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1061
		1062	// a PONG might mean that the other side doesn't really know
		1063	// about our desire for communication.
		1064	establish_connection ();
920	break;	1065	break;
921		1066
922	case vpn_packet::PT_RESET:	1067	case vpn_packet::PT_RESET:
		1068	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1069
		1070	if (ictx && octx)
923	{	1071	{
924	reset_connection ();	1072	reset_connection ("remote reset");
925		1073
926	config_packet *p = (config_packet *) pkt;	1074	config_packet *p = (config_packet *) pkt;
927		1075
928	if (!p->chk_config ())	1076	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
929	{
930	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
931	conf->nodename, (const char *)rsi);
932	connectmode = conf_node::C_DISABLED;
933	}
934	else if (connectmode == conf_node::C_ALWAYS)
935	establish_connection ();	1077	establish_connection ();
936	}	1078	}
		1079
937	break;	1080	break;
938		1081
939	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
940	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
941	{	1084	{
942	auth_req_packet *p = (auth_req_packet *) pkt;	1085	auth_req_packet *p = (auth_req_packet *)pkt;
943		1086
944	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);
945		1090
946	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))
947	{	1097	{
948	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
949	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."),
950	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
951	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
952		1102
953	if (p->initiate)	1103	if (p->initiate)
		1104	{
954	send_auth_request (rsi, false);	1105	send_auth_request (rsi, false);
955		1106
956	rsachallenge k;	1107	if (ictx && octx)
		1108	reset_connection ("reconnect");
		1109	}
957		1110
		1111	auth_data auth;
		1112
958	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1113	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
959	{	1114	{
960	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1115	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
961	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1116	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
962	break;
963	}	1117	}
964	else	1118	else
965	{	1119	{
966	delete octx;	1120	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
967		1121
968	octx = new crypto_ctx (k, 1);	1122	rcv_auth = auth;
969	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1123	have_rcv_auth = true;
970		1124
		1125	send_auth_response (rsi);
		1126
		1127	if (chg)
		1128	{
971	conf->protocols = p->protocols;	1129	conf->protocols = p->protocols;
972	features = p->features & config_packet::get_features ();	1130	features = p->features & config_packet::get_features ();
973		1131
974	send_auth_response (rsi, p->id, k);
975
976	connection_established ();	1132	connection_established (rsi);
977
978	break;	1133	}
979	}	1134	}
		1135
		1136	break;
980	}	1137	}
981	else
982	slog (L_WARN, _("%s(%s): protocol mismatch"),
983	conf->nodename, (const char *)rsi);
984		1138
985	send_reset (rsi);	1139	send_reset (rsi);
986	}	1140	}
987		1141
988	break;	1142	break;
989		1143
990	case vpn_packet::PT_AUTH_RES:	1144	case vpn_packet::PT_AUTH_RES:
991	{	1145	{
992	auth_res_packet *p = (auth_res_packet *) pkt;	1146	auth_res_packet *p = (auth_res_packet *)pkt;
993		1147
994	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1148	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
995		1149
996	if (p->chk_config ())	1150	auth_mac local_mac;
		1151	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1152
		1153	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
997	{	1154	{
998	if (p->prot_minor != PROTOCOL_MINOR)
999	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1000	conf->nodename, (const char *)rsi,
1001	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1002
1003	rsachallenge chg;
1004
1005	if (!rsa_cache.find (p->id, chg))
1006	{
1007	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1155	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1008	conf->nodename, (const char *)rsi);	1156	conf->nodename, (const char *)rsi);
1009	break;
1010	}	1157	}
1011	else	1158	else if (!have_snd_auth)
1012	{	1159	{
1013	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1160	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1014		1161
1015	if (!p->hmac_chk (cctx))	1162	have_snd_auth = true;
1016	{
1017	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1018	"could be an attack, or just corruption or a synchronization error"),
1019	conf->nodename, (const char *)rsi);
1020	break;
1021	}
1022	else
1023	{
1024	rsaresponse h;
1025
1026	rsa_hash (p->id, chg, h);
1027
1028	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1029	{
1030	prot_minor = p->prot_minor;
1031
1032	delete ictx; ictx = cctx;
1033
1034	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1035
1036	si = rsi;
1037	protocol = rsi.prot;
1038
1039	connection_established ();	1163	connection_established (rsi);
1040
1041	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1042	conf->nodename, (const char *)rsi,
1043	p->prot_major, p->prot_minor);
1044
1045	if (::conf.script_node_up)
1046	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1047	slog (L_WARN, _("node-up command execution failed, continuing."));
1048
1049	break;
1050	}
1051	else
1052	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1053	conf->nodename, (const char *)rsi);
1054	}
1055
1056	delete cctx;
1057	}
1058	}	1164	}
1059	}	1165	}
1060
1061	send_reset (rsi);
1062	break;	1166	break;
1063		1167
1064	case vpn_packet::PT_DATA_COMPRESSED:	1168	case vpn_packet::PT_DATA_COMPRESSED:
1065	#if !ENABLE_COMPRESSION	1169	#if !ENABLE_COMPRESSION
1066	send_reset (rsi);	1170	send_reset (rsi);
…		…
1072	if (ictx && octx)	1176	if (ictx && octx)
1073	{	1177	{
1074	vpndata_packet *p = (vpndata_packet *)pkt;	1178	vpndata_packet *p = (vpndata_packet *)pkt;
1075		1179
1076	if (!p->hmac_chk (ictx))	1180	if (!p->hmac_chk (ictx))
		1181	{
		1182	// rekeying often creates temporary hmac auth floods
		1183	// we assume they don't take longer than a few seconds normally,
		1184	// and suppress messages and resets during that time.
		1185	//TODO: should be done per source address
		1186	if (!hmac_error)
		1187	{
		1188	hmac_error = ev_now () + 3;
		1189	break;
		1190	}
		1191	else if (hmac_error >= ev_now ())
		1192	break; // silently suppress
		1193	else
		1194	{
1077	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1195	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1078	"could be an attack, or just corruption or a synchronization error"),	1196	"could be an attack, or just corruption or a synchronization error."),
1079	conf->nodename, (const char *)rsi);	1197	conf->nodename, (const char *)rsi);
		1198	// reset
		1199	}
		1200	}
1080	else	1201	else
1081	{	1202	{
1082	u32 seqno;	1203	u32 seqno;
1083	tap_packet *d = p->unpack (this, seqno);	1204	tap_packet *d = p->unpack (this, seqno);
		1205	int seqclass = iseqno.seqno_classify (seqno);
1084		1206
1085	if (iseqno.recv_ok (seqno))	1207	hmac_error = 0;
		1208
		1209	if (seqclass == 0) // ok
1086	{	1210	{
1087	vpn->tap->send (d);	1211	vpn->tap->send (d);
1088		1212
1089	if (si != rsi)	1213	if (si != rsi)
1090	{	1214	{
1091	// fast re-sync on source address changes, useful especially for tcp/ip	1215	// fast re-sync on source address changes, useful especially for tcp/ip
		1216	//if (last_si_change < ev_now () + 5.)
1092	si = rsi;	1217	// {
1093
1094	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1218	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1095	conf->nodename, (const char *)si, (const char *)rsi);	1219	conf->nodename, (const char *)si, (const char *)rsi);
		1220
		1221	si = rsi;
		1222
		1223	if (::conf.script_node_change)
		1224	{
		1225	run_script_cb *cb = new run_script_cb;
		1226	cb->set<connection, &connection::script_node_change> (this);
		1227	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1228	}
		1229
		1230	// }
		1231	//else
		1232	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1233	// conf->nodename, (const char *)si, (const char *)rsi);
1096	}	1234	}
		1235	}
		1236	else if (seqclass == 1) // far history
		1237	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1238	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1239	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1240	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1241	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1242	else if (seqclass == 3) // reset
		1243	{
		1244	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1245	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1246	send_reset (rsi);
1097	}	1247	}
1098		1248
1099	delete d;	1249	delete d;
1100	break;	1250	break;
1101	}	1251	}
…		…
1105	break;	1255	break;
1106		1256
1107	case vpn_packet::PT_CONNECT_REQ:	1257	case vpn_packet::PT_CONNECT_REQ:
1108	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1109	{	1259	{
1110	connect_req_packet *p = (connect_req_packet *) pkt;	1260	connect_req_packet *p = (connect_req_packet *)pkt;
1111		1261
1112	if (p->id > 0 && p->id <= vpn->conns.size ())	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1113	{	1263	{
1114	connection *c = vpn->conns[p->id - 1];	1264	connection *c = vpn->conns[p->id - 1];
1115	conf->protocols = p->protocols;	1265	conf->protocols = p->protocols;
1116		1266
1117	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1267	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1268	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1269	p->protocols,
1118	conf->id, p->id, c->ictx && c->octx);	1270	c->ictx && c->octx);
1119		1271
1120	if (c->ictx && c->octx)	1272	if (c->ictx && c->octx)
1121	{	1273	{
1122	// send connect_info packets to both sides, in case one is	1274	// send connect_info packets to both sides, in case one is
1123	// behind a nat firewall (or both ;)	1275	// behind a nat firewall (or both ;)
…		…
1146		1298
1147	c->conf->protocols = p->protocols;	1299	c->conf->protocols = p->protocols;
1148	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1300	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1149	p->si.upgrade_protocol (protocol, c->conf);	1301	p->si.upgrade_protocol (protocol, c->conf);
1150		1302
1151	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1303	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1152	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1304	conf->nodename,
		1305	vpn->conns[p->id - 1]->conf->nodename,
		1306	(const char *)p->si,
		1307	p->protocols,
		1308	protocol,
		1309	p->si.supported_protocols (c->conf),
		1310	!c->ictx && !c->octx);
1153		1311
1154	const sockinfo &dsi = forward_si (p->si);	1312	const sockinfo &dsi = forward_si (p->si);
1155		1313
1156	if (dsi.valid ())	1314	if (dsi.valid ())
1157	c->send_auth_request (dsi, true);	1315	c->send_auth_request (dsi, true);
		1316	else
		1317	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1318	vpn->conns[p->id - 1]->conf->nodename,
		1319	(const char *)p->si);
1158	}	1320	}
1159	else	1321	else
1160	slog (L_WARN,	1322	slog (L_WARN,
1161	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1323	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1162	p->id);	1324	p->id);
…		…
1168	send_reset (rsi);	1330	send_reset (rsi);
1169	break;	1331	break;
1170	}	1332	}
1171	}	1333	}
1172		1334
		1335	inline void
1173	void connection::keepalive_cb (ev::timer &w, int revents)	1336	connection::keepalive_cb (ev::timer &w, int revents)
1174	{	1337	{
1175	if (ev_now () >= last_activity + ::conf.keepalive + 30)	1338	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1339
		1340	if (when >= 0)
		1341	w.start (when);
		1342	else if (when < -15)
1176	{	1343	{
1177	reset_connection ();	1344	reset_connection ("keepalive overdue");
1178	establish_connection ();	1345	establish_connection ();
1179	}	1346	}
1180	else if (ev_now () < last_activity + ::conf.keepalive)
1181	w.start (last_activity + ::conf.keepalive - ev::now ());
1182	else if (conf->connectmode != conf_node::C_ONDEMAND	1347	else if (conf->connectmode != conf_node::C_ONDEMAND
1183	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1348	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1184	{	1349	{
		1350	w.start (3);
1185	send_ping (si);	1351	send_ping (si);
1186	w.start (5);
1187	}	1352	}
1188	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1353	else if (when >= -10)
1189	// hold ondemand connections implicitly a few seconds longer	1354	// hold ondemand connections implicitly a few seconds longer
1190	// should delete octx, though, or something like that ;)	1355	// should delete octx, though, or something like that ;)
1191	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1356	w.start (when + 10);
1192	else	1357	else
1193	reset_connection ();	1358	reset_connection ("keepalive timeout");
1194	}	1359	}
1195		1360
		1361	void
1196	void connection::send_connect_request (int id)	1362	connection::send_connect_request (int id)
1197	{	1363	{
1198	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1364	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1199		1365
1200	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1366	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1367	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1368	THISNODE->protocols);
1201	p->hmac_set (octx);	1369	p->hmac_set (octx);
1202	send_vpn_packet (p, si);	1370	send_vpn_packet (p, si);
1203		1371
1204	delete p;	1372	delete p;
1205	}	1373	}
1206		1374
		1375	void
1207	void connection::script_init_env (const char *ext)	1376	connection::script_init_env (const char *ext)
1208	{	1377	{
1209	char *env;	1378	char *env;
1210	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1379	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1211	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1380	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1212	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1381	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1213	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1382	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1214	conf->id & 0xff); putenv (env);	1383	conf->id & 0xff); putenv (env);
1215	}	1384	}
1216		1385
		1386	void
1217	void connection::script_init_connect_env ()	1387	connection::script_init_connect_env ()
1218	{	1388	{
1219	vpn->script_init_env ();	1389	vpn->script_init_env ();
1220		1390
1221	char *env;	1391	char *env;
1222	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1392	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1393	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1223	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1394	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1224	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1395	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1225	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1396	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1226	}	1397	}
1227		1398
		1399	inline const char *
1228	const char *connection::script_node_up ()	1400	connection::script_node_up ()
1229	{	1401	{
1230	script_init_connect_env ();	1402	script_init_connect_env ();
1231		1403
1232	putenv ((char *)"STATE=up");	1404	putenv ((char *)"STATE=up");
1233		1405
…		…
1238	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1410	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1239		1411
1240	return filename;	1412	return filename;
1241	}	1413	}
1242		1414
		1415	inline const char *
		1416	connection::script_node_change ()
		1417	{
		1418	script_init_connect_env ();
		1419
		1420	putenv ((char *)"STATE=change");
		1421
		1422	char *filename;
		1423	asprintf (&filename,
		1424	"%s/%s",
		1425	confbase,
		1426	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1427
		1428	return filename;
		1429	}
		1430
		1431	inline const char *
1243	const char *connection::script_node_down ()	1432	connection::script_node_down ()
1244	{	1433	{
1245	script_init_connect_env ();	1434	script_init_connect_env ();
1246		1435
1247	putenv ((char *)"STATE=down");	1436	putenv ((char *)"STATE=down");
1248		1437
…		…
1254		1443
1255	return filename;	1444	return filename;
1256	}	1445	}
1257		1446
1258	connection::connection (struct vpn *vpn, conf_node *conf)	1447	connection::connection (struct vpn *vpn, conf_node *conf)
1259	: vpn(vpn), conf(conf)	1448	: vpn(vpn), conf(conf),
1260	, rekey (this, &connection::rekey_cb)
1261	, keepalive (this, &connection::keepalive_cb)
1262	, establish_connection (this, &connection::establish_connection_cb)
1263	#if ENABLE_DNS	1449	#if ENABLE_DNS
1264	, dns (0)	1450	dns (0),
1265	#endif	1451	#endif
		1452	data_queue(conf->max_ttl, conf->max_queue + 1),
		1453	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1266	{	1454	{
		1455	rekey .set<connection, &connection::rekey_cb > (this);
		1456	keepalive .set<connection, &connection::keepalive_cb > (this);
		1457	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1458
		1459	last_establish_attempt = 0.;
1267	octx = ictx = 0;	1460	octx = ictx = 0;
1268	retry_cnt = 0;
1269		1461
1270	if (!conf->protocols) // make sure some protocol is enabled	1462	connectmode = conf->connectmode;
1271	conf->protocols = PROT_UDPv4;
1272		1463
1273	connectmode = conf_node::C_ALWAYS; // initial setting	1464	// queue a dummy packet to force an initial connection attempt
		1465	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1466	vpn_queue.put (new net_packet);
		1467
1274	reset_connection ();	1468	reset_connection ("startup");
1275	}	1469	}
1276		1470
1277	connection::~connection ()	1471	connection::~connection ()
1278	{	1472	{
1279	shutdown ();	1473	shutdown ();
1280	}	1474	}
1281		1475
		1476	void
1282	void connection_init ()	1477	connection_init ()
1283	{	1478	{
1284	auth_rate_limiter.clear ();	1479	auth_rate_limiter.clear ();
1285	reset_rate_limiter.clear ();	1480	reset_rate_limiter.clear ();
1286	}	1481	}
1287		1482

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