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/cvs/gvpe/src/protocol.C

Comparing gvpe/src/protocol.C (file contents):
Revision 1.11 by pcg, Sat Mar 22 21:35:07 2003 UTC vs.
Revision 1.23 by pcg, Fri Mar 28 05:40:54 2003 UTC

…		…
58		58
59	static time_t next_timecheck;	59	static time_t next_timecheck;
60		60
61	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	61	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
62		62
63	static const rsachallenge &	63	static u8
64	challenge_bytes ()	64	best_protocol (u8 protset)
65	{	65	{
66	static rsachallenge challenge;	66	if (protset & PROT_IPv4)
67	static double challenge_ttl; // time this challenge needs to be recreated	67	return PROT_IPv4;
68		68
69	if (NOW > challenge_ttl)	69	return PROT_UDPv4;
70	{
71	RAND_bytes ((unsigned char *)&challenge, sizeof (challenge));
72	challenge_ttl = NOW + CHALLENGE_TTL;
73	}
74
75	return challenge;
76	}
77
78	// caching of rsa operations really helps slow computers
79	struct rsa_entry {
80	tstamp expire;
81	rsachallenge chg;
82	RSA *key; // which key
83	rsaencrdata encr;
84
85	rsa_entry ()
86	{
87	expire = NOW + CHALLENGE_TTL;
88	}
89	};
90
91	struct rsa_cache : list<rsa_entry>
92	{
93	void cleaner_cb (tstamp &ts); time_watcher cleaner;
94
95	const rsaencrdata *public_encrypt (RSA *key, const rsachallenge &chg)
96	{
97	for (iterator i = begin (); i != end (); ++i)
98	{
99	if (i->key == key && !memcmp (&chg, &i->chg, sizeof chg))
100	return &i->encr;
101	}
102
103	if (cleaner.at < NOW)
104	cleaner.start (NOW + CHALLENGE_TTL);
105
106	resize (size () + 1);
107	rsa_entry *e = &(*rbegin ());
108
109	e->key = key;
110	memcpy (&e->chg, &chg, sizeof chg);
111
112	if (0 > RSA_public_encrypt (sizeof chg,
113	(unsigned char *)&chg, (unsigned char *)&e->encr,
114	key, RSA_PKCS1_OAEP_PADDING))
115	fatal ("RSA_public_encrypt error");
116
117	return &e->encr;
118	}
119
120	const rsachallenge *private_decrypt (RSA *key, const rsaencrdata &encr)
121	{
122	for (iterator i = begin (); i != end (); ++i)
123	if (i->key == key && !memcmp (&encr, &i->encr, sizeof encr))
124	return &i->chg;
125
126	if (cleaner.at < NOW)
127	cleaner.start (NOW + CHALLENGE_TTL);
128
129	resize (size () + 1);
130	rsa_entry *e = &(*rbegin ());
131
132	e->key = key;
133	memcpy (&e->encr, &encr, sizeof encr);
134
135	if (0 > RSA_private_decrypt (sizeof encr,
136	(unsigned char *)&encr, (unsigned char *)&e->chg,
137	key, RSA_PKCS1_OAEP_PADDING))
138	{
139	pop_back ();
140	return 0;
141	}
142
143	return &e->chg;
144	}
145
146	rsa_cache ()
147	: cleaner (this, &rsa_cache::cleaner_cb)
148	{ }
149
150	} rsa_cache;
151
152	void rsa_cache::cleaner_cb (tstamp &ts)
153	{
154	if (empty ())
155	ts = TSTAMP_CANCEL;
156	else
157	{
158	ts = NOW + 3;
159	for (iterator i = begin (); i != end (); )
160	{
161	if (i->expire >= NOW)
162	i = erase (i);
163	else
164	++i;
165	}
166	}
167	}
168
169	// run a script. yes, it's a template function. yes, c++
170	// is not a functional language. yes, this suxx.
171	template<class owner>
172	static void
173	run_script (owner *obj, const char *(owner::*setup)(), bool wait)
174	{
175	int pid;
176
177	if ((pid = fork ()) == 0)
178	{
179	char *filename;
180	asprintf (&filename, "%s/%s", confbase, (obj->*setup) ());
181	execl (filename, filename, (char *) 0);
182	exit (255);
183	}
184	else if (pid > 0)
185	{
186	if (wait)
187	{
188	waitpid (pid, 0, 0);
189	/* TODO: check status */
190	}
191	}
192	}
193
194	// xor the socket address into the challenge to ensure different challenges
195	// per host. we could rely on the OAEP padding, but this doesn't hurt.
196	void
197	xor_sa (rsachallenge &k, SOCKADDR *sa)
198	{
199	((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr;
200	((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port;
201	((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr;
202	((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port;
203	}	70	}
204		71
205	struct crypto_ctx	72	struct crypto_ctx
206	{	73	{
207	EVP_CIPHER_CTX cctx;	74	EVP_CIPHER_CTX cctx;
…		…
223	{	90	{
224	EVP_CIPHER_CTX_cleanup (&cctx);	91	EVP_CIPHER_CTX_cleanup (&cctx);
225	HMAC_CTX_cleanup (&hctx);	92	HMAC_CTX_cleanup (&hctx);
226	}	93	}
227		94
		95	static void
		96	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
		97	{
		98	EVP_MD_CTX ctx;
		99
		100	EVP_MD_CTX_init (&ctx);
		101	EVP_DigestInit (&ctx, RSA_HASH);
		102	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
		103	EVP_DigestUpdate(&ctx, &id, sizeof id);
		104	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
		105	EVP_MD_CTX_cleanup (&ctx);
		106	}
		107
		108	struct rsa_entry {
		109	tstamp expire;
		110	rsaid id;
		111	rsachallenge chg;
		112	};
		113
		114	struct rsa_cache : list<rsa_entry>
		115	{
		116	void cleaner_cb (tstamp &ts); time_watcher cleaner;
		117
		118	bool find (const rsaid &id, rsachallenge &chg)
		119	{
		120	for (iterator i = begin (); i != end (); ++i)
		121	{
		122	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
		123	{
		124	memcpy (&chg, &i->chg, sizeof chg);
		125
		126	erase (i);
		127	return true;
		128	}
		129	}
		130
		131	if (cleaner.at < NOW)
		132	cleaner.start (NOW + RSA_TTL);
		133
		134	return false;
		135	}
		136
		137	void gen (rsaid &id, rsachallenge &chg)
		138	{
		139	rsa_entry e;
		140
		141	RAND_bytes ((unsigned char *)&id, sizeof id);
		142	RAND_bytes ((unsigned char *)&chg, sizeof chg);
		143
		144	e.expire = NOW + RSA_TTL;
		145	e.id = id;
		146	memcpy (&e.chg, &chg, sizeof chg);
		147
		148	push_back (e);
		149
		150	if (cleaner.at < NOW)
		151	cleaner.start (NOW + RSA_TTL);
		152	}
		153
		154	rsa_cache ()
		155	: cleaner (this, &rsa_cache::cleaner_cb)
		156	{ }
		157
		158	} rsa_cache;
		159
		160	void rsa_cache::cleaner_cb (tstamp &ts)
		161	{
		162	if (empty ())
		163	ts = TSTAMP_CANCEL;
		164	else
		165	{
		166	ts = NOW + RSA_TTL;
		167
		168	for (iterator i = begin (); i != end (); )
		169	if (i->expire <= NOW)
		170	i = erase (i);
		171	else
		172	++i;
		173	}
		174	}
		175
		176	typedef callback<const char *, int> run_script_cb;
		177
		178	// run a shell script (or actually an external program).
		179	static void
		180	run_script (const run_script_cb &cb, bool wait)
		181	{
		182	int pid;
		183
		184	if ((pid = fork ()) == 0)
		185	{
		186	char *filename;
		187	asprintf (&filename, "%s/%s", confbase, cb(0));
		188	execl (filename, filename, (char *) 0);
		189	exit (255);
		190	}
		191	else if (pid > 0)
		192	{
		193	if (wait)
		194	{
		195	waitpid (pid, 0, 0);
		196	/* TODO: check status */
		197	}
		198	}
		199	}
		200
228	//////////////////////////////////////////////////////////////////////////////	201	//////////////////////////////////////////////////////////////////////////////
229		202
230	void pkt_queue::put (tap_packet *p)	203	void pkt_queue::put (tap_packet *p)
231	{	204	{
232	if (queue[i])	205	if (queue[i])
…		…
264	{	237	{
265	for (i = QUEUEDEPTH; --i > 0; )	238	for (i = QUEUEDEPTH; --i > 0; )
266	delete queue[i];	239	delete queue[i];
267	}	240	}
268		241
		242	struct net_rateinfo {
		243	u32 host;
		244	double pcnt, diff;
		245	tstamp last;
		246	};
		247
269	// only do action once every x seconds per host.	248	// only do action once every x seconds per host whole allowing bursts.
270	// currently this is quite a slow implementation,	249	// this implementation ("splay list" ;) is inefficient,
271	// but suffices for normal operation.	250	// but low on resources.
272	struct u32_rate_limiter : private map<u32, tstamp>	251	struct net_rate_limiter : list<net_rateinfo>
273	{	252	{
274	tstamp every;	253	static const double ALPHA = 1. - 1. / 90.; // allow bursts
		254	static const double CUTOFF = 20.; // one event every CUTOFF seconds
		255	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
275		256
		257	bool can (const sockinfo &si) { return can((u32)si.host); }
276	bool can (u32 host);	258	bool can (u32 host);
277
278	u32_rate_limiter (tstamp every = 1)
279	{
280	this->every = every;
281	}
282	};	259	};
283		260
284	struct net_rate_limiter : u32_rate_limiter	261	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
285	{
286	bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); }
287	bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); }
288		262
289	net_rate_limiter (tstamp every) : u32_rate_limiter (every) {}
290	};
291
292	bool u32_rate_limiter::can (u32 host)	263	bool net_rate_limiter::can (u32 host)
293	{	264	{
294	iterator i;	265	iterator i;
295		266
296	for (i = begin (); i != end (); )	267	for (i = begin (); i != end (); )
297	if (i->second <= NOW)	268	if (i->host == host)
298	{	269	break;
		270	else if (i->last < NOW - EXPIRE)
299	erase (i);	271	i = erase (i);
300	i = begin ();
301	}
302	else	272	else
303	++i;	273	i++;
304		274
305	i = find (host);
306
307	if (i != end ())	275	if (i == end ())
308	return false;	276	{
		277	net_rateinfo ri;
309		278
310	insert (value_type (host, NOW + every));	279	ri.host = host;
		280	ri.pcnt = 1.;
		281	ri.diff = CUTOFF * (1. / (1. - ALPHA));
		282	ri.last = NOW;
311		283
		284	push_front (ri);
		285
312	return true;	286	return true;
		287	}
		288	else
		289	{
		290	net_rateinfo ri (*i);
		291	erase (i);
		292
		293	ri.pcnt = ri.pcnt * ALPHA;
		294	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
		295
		296	ri.last = NOW;
		297
		298	bool send = ri.diff / ri.pcnt > CUTOFF;
		299
		300	if (send)
		301	ri.pcnt++;
		302
		303	push_front (ri);
		304
		305	return send;
		306	}
313	}	307	}
314		308
315	/////////////////////////////////////////////////////////////////////////////	309	/////////////////////////////////////////////////////////////////////////////
316		310
317	static void next_wakeup (time_t next)	311	static void next_wakeup (time_t next)
…		…
321	}	315	}
322		316
323	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];	317	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
324		318
325	struct hmac_packet:net_packet	319	struct hmac_packet:net_packet
		320	{
		321	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
		322
		323	void hmac_set (crypto_ctx * ctx);
		324	bool hmac_chk (crypto_ctx * ctx);
		325
		326	private:
		327	void hmac_gen (crypto_ctx * ctx)
326	{	328	{
327	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
328
329	void hmac_set (crypto_ctx * ctx);
330	bool hmac_chk (crypto_ctx * ctx);
331
332	private:
333	void hmac_gen (crypto_ctx * ctx)
334	{
335	unsigned int xlen;	329	unsigned int xlen;
336	HMAC_CTX *hctx = &ctx->hctx;	330	HMAC_CTX *hctx = &ctx->hctx;
337		331
338	HMAC_Init_ex (hctx, 0, 0, 0, 0);	332	HMAC_Init_ex (hctx, 0, 0, 0, 0);
339	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	333	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
340	len - sizeof (hmac_packet));	334	len - sizeof (hmac_packet));
341	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	335	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
342	}
343	};	336	}
		337	};
344		338
345	void	339	void
346	hmac_packet::hmac_set (crypto_ctx * ctx)	340	hmac_packet::hmac_set (crypto_ctx * ctx)
347	{	341	{
348	hmac_gen (ctx);	342	hmac_gen (ctx);
…		…
364	{	358	{
365	PT_RESET = 0,	359	PT_RESET = 0,
366	PT_DATA_UNCOMPRESSED,	360	PT_DATA_UNCOMPRESSED,
367	PT_DATA_COMPRESSED,	361	PT_DATA_COMPRESSED,
368	PT_PING, PT_PONG, // wasting namespace space? ;)	362	PT_PING, PT_PONG, // wasting namespace space? ;)
369	PT_AUTH, // authentification	363	PT_AUTH_REQ, // authentification request
		364	PT_AUTH_RES, // authentification response
370	PT_CONNECT_REQ, // want other host to contact me	365	PT_CONNECT_REQ, // want other host to contact me
371	PT_CONNECT_INFO, // request connection to some node	366	PT_CONNECT_INFO, // request connection to some node
372	PT_REKEY, // rekeying (not yet implemented)
373	PT_MAX	367	PT_MAX
374	};	368	};
375		369
376	u8 type;	370	u8 type;
377	u8 srcdst, src1, dst1;	371	u8 srcdst, src1, dst1;
378		372
379	void set_hdr (ptype type, unsigned int dst);	373	void set_hdr (ptype type, unsigned int dst);
380		374
381	unsigned int src ()	375	unsigned int src () const
382	{	376	{
383	return src1 | ((srcdst >> 4) << 8);	377	return src1 | ((srcdst >> 4) << 8);
384	}	378	}
385		379
386	unsigned int dst ()	380	unsigned int dst () const
387	{	381	{
388	return dst1 | ((srcdst & 0xf) << 8);	382	return dst1 | ((srcdst & 0xf) << 8);
389	}	383	}
390		384
391	ptype typ ()	385	ptype typ () const
392	{	386	{
393	return (ptype) type;	387	return (ptype) type;
394	}	388	}
395	};	389	};
396		390
…		…
445	}	439	}
446	#endif	440	#endif
447		441
448	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	442	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);
449		443
		444	struct {
450	#if RAND_SIZE	445	#if RAND_SIZE
451	struct {
452	u8 rnd[RAND_SIZE];	446	u8 rnd[RAND_SIZE];
		447	#endif
453	u32 seqno;	448	u32 seqno;
454	} datahdr;	449	} datahdr;
455		450
456	datahdr.seqno = seqno;	451	datahdr.seqno = ntohl (seqno);
		452	#if RAND_SIZE
457	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	453	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
		454	#endif
458		455
459	EVP_EncryptUpdate (cctx,	456	EVP_EncryptUpdate (cctx,
460	(unsigned char *) data + outl, &outl2,	457	(unsigned char *) data + outl, &outl2,
461	(unsigned char *) &datahdr, DATAHDR);	458	(unsigned char *) &datahdr, DATAHDR);
462	outl += outl2;	459	outl += outl2;
463	#else
464	EVP_EncryptUpdate (cctx,
465	(unsigned char *) data + outl, &outl2,
466	(unsigned char *) &seqno, DATAHDR);
467	outl += outl2;
468	#endif
469		460
470	EVP_EncryptUpdate (cctx,	461	EVP_EncryptUpdate (cctx,
471	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
472	(unsigned char *) d, l);	463	(unsigned char *) d, l);
473	outl += outl2;	464	outl += outl2;
…		…
509	outl += outl2;	500	outl += outl2;
510		501
511	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	502	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);
512	outl += outl2;	503	outl += outl2;
513		504
514	seqno = *(u32 *)(d + RAND_SIZE);	505	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
515		506
516	id2mac (dst () ? dst() : THISNODE->id, p->dst);	507	id2mac (dst () ? dst() : THISNODE->id, p->dst);
517	id2mac (src (), p->src);	508	id2mac (src (), p->src);
518		509
519	#if ENABLE_COMPRESSION	510	#if ENABLE_COMPRESSION
520	if (type == PT_DATA_COMPRESSED)	511	if (type == PT_DATA_COMPRESSED)
521	{	512	{
522	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	513	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];
		514
523	p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6;	515	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,
		516	&(*p)[6 + 6], MAX_MTU)
		517	+ 6 + 6;
524	}	518	}
525	else	519	else
526	p->len = outl + (6 + 6 - DATAHDR);	520	p->len = outl + (6 + 6 - DATAHDR);
527	#endif	521	#endif
528		522
529	return p;	523	return p;
530	}	524	}
531		525
532	struct ping_packet : vpn_packet	526	struct ping_packet : vpn_packet
		527	{
		528	void setup (int dst, ptype type)
533	{	529	{
534	void setup (int dst, ptype type)
535	{
536	set_hdr (type, dst);	530	set_hdr (type, dst);
537	len = sizeof (*this) - sizeof (net_packet);	531	len = sizeof (*this) - sizeof (net_packet);
538	}
539	};	532	}
		533	};
540		534
541	struct config_packet : vpn_packet	535	struct config_packet : vpn_packet
		536	{
		537	// actually, hmaclen cannot be checked because the hmac
		538	// field comes before this data, so peers with other
		539	// hmacs simply will not work.
		540	u8 prot_major, prot_minor, randsize, hmaclen;
		541	u8 flags, challengelen, pad2, pad3;
		542	u32 cipher_nid, digest_nid, hmac_nid;
		543
		544	const u8 curflags () const
542	{	545	{
543	// actually, hmaclen cannot be checked because the hmac
544	// field comes before this data, so peers with other
545	// hmacs simply will not work.
546	u8 prot_major, prot_minor, randsize, hmaclen;
547	u8 flags, challengelen, pad2, pad3;
548	u32 cipher_nid;
549	u32 digest_nid;
550
551	const u8 curflags () const
552	{
553	return 0x80	546	return 0x80
554	| 0x02
555	#if PROTOCOL_MAJOR != 2
556	#error hi
557	#endif
558	| (ENABLE_COMPRESSION ? 0x01 : 0x00);	547	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
559	}	548	}
560		549
561	void setup (ptype type, int dst)	550	void setup (ptype type, int dst);
562	{	551	bool chk_config () const;
		552	};
		553
		554	void config_packet::setup (ptype type, int dst)
		555	{
563	prot_major = PROTOCOL_MAJOR;	556	prot_major = PROTOCOL_MAJOR;
564	prot_minor = PROTOCOL_MINOR;	557	prot_minor = PROTOCOL_MINOR;
565	randsize = RAND_SIZE;	558	randsize = RAND_SIZE;
566	hmaclen = HMACLENGTH;	559	hmaclen = HMACLENGTH;
567	flags = curflags ();	560	flags = curflags ();
568	challengelen = sizeof (rsachallenge);	561	challengelen = sizeof (rsachallenge);
569		562
570	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	563	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
571	digest_nid = htonl (EVP_MD_type (DIGEST));	564	digest_nid = htonl (EVP_MD_type (RSA_HASH));
		565	hmac_nid = htonl (EVP_MD_type (DIGEST));
572		566
573	len = sizeof (*this) - sizeof (net_packet);	567	len = sizeof (*this) - sizeof (net_packet);
574	set_hdr (type, dst);	568	set_hdr (type, dst);
575	}	569	}
576		570
577	bool chk_config ()	571	bool config_packet::chk_config () const
578	{	572	{
579	return prot_major == PROTOCOL_MAJOR	573	return prot_major == PROTOCOL_MAJOR
580	&& randsize == RAND_SIZE	574	&& randsize == RAND_SIZE
581	&& hmaclen == HMACLENGTH	575	&& hmaclen == HMACLENGTH
582	&& flags == curflags ()	576	&& flags == curflags ()
583	&& challengelen == sizeof (rsachallenge)	577	&& challengelen == sizeof (rsachallenge)
584	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	578	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))
		579	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))
585	&& digest_nid == htonl (EVP_MD_type (DIGEST));	580	&& hmac_nid == htonl (EVP_MD_type (DIGEST));
586	}	581	}
587	};
588		582
589	struct auth_packet : config_packet	583	struct auth_req_packet : config_packet
		584	{
		585	char magic[8];
		586	u8 initiate, can_recv; // false if this is just an automatic reply
		587	u8 pad2, pad3;
		588	rsaid id;
		589	rsaencrdata encr;
		590
		591	auth_req_packet (int dst, bool initiate_, u8 can_recv_)
590	{	592	{
591	char magic[8];
592	u8 subtype;
593	u8 pad1, pad2;
594	rsaencrdata challenge;
595
596	auth_packet (int dst, auth_subtype stype)
597	{
598	config_packet::setup (PT_AUTH, dst);	593	config_packet::setup (PT_AUTH_REQ, dst);
599	subtype = stype;	594	strncpy (magic, MAGIC, 8);
		595	initiate = !!initiate_;
		596	can_recv = can_recv_;
		597
600	len = sizeof (*this) - sizeof (net_packet);	598	len = sizeof (*this) - sizeof (net_packet);
601	strncpy (magic, MAGIC, 8);
602	}
603	};	599	}
		600	};
		601
		602	struct auth_res_packet : config_packet
		603	{
		604	rsaid id;
		605	u8 pad1, pad2, pad3;
		606	u8 response_len; // encrypted length
		607	rsaresponse response;
		608
		609	auth_res_packet (int dst)
		610	{
		611	config_packet::setup (PT_AUTH_RES, dst);
		612
		613	len = sizeof (*this) - sizeof (net_packet);
		614	}
		615	};
604		616
605	struct connect_req_packet : vpn_packet	617	struct connect_req_packet : vpn_packet
		618	{
		619	u8 id;
		620	u8 pad1, pad2, pad3;
		621
		622	connect_req_packet (int dst, int id_)
606	{	623	{
607	u8 id;	624	id = id_;
608	u8 pad1, pad2, pad3;
609
610	connect_req_packet (int dst, int id)
611	{
612	this->id = id;
613	set_hdr (PT_CONNECT_REQ, dst);	625	set_hdr (PT_CONNECT_REQ, dst);
614	len = sizeof (*this) - sizeof (net_packet);	626	len = sizeof (*this) - sizeof (net_packet);
615	}
616	};	627	}
		628	};
617		629
618	struct connect_info_packet : vpn_packet	630	struct connect_info_packet : vpn_packet
		631	{
		632	u8 id, can_recv;
		633	u8 pad1, pad2;
		634	sockinfo si;
		635
		636	connect_info_packet (int dst, int id_, sockinfo &si_, u8 can_recv_)
619	{	637	{
620	u8 id;	638	id = id_;
621	u8 pad1, pad2, pad3;	639	can_recv = can_recv_;
622	sockinfo si;	640	si = si_;
623
624	connect_info_packet (int dst, int id, sockinfo &si)
625	{
626	this->id = id;
627	this->si = si;
628	set_hdr (PT_CONNECT_INFO, dst);	641	set_hdr (PT_CONNECT_INFO, dst);
		642
629	len = sizeof (*this) - sizeof (net_packet);	643	len = sizeof (*this) - sizeof (net_packet);
630	}
631	};	644	}
		645	};
632		646
633	/////////////////////////////////////////////////////////////////////////////	647	/////////////////////////////////////////////////////////////////////////////
634		648
635	void	649	void
636	fill_sa (SOCKADDR *sa, conf_node *conf)
637	{
638	sa->sin_family = AF_INET;
639	sa->sin_port = htons (conf->port);
640	sa->sin_addr.s_addr = 0;
641
642	if (conf->hostname)
643	{
644	struct hostent *he = gethostbyname (conf->hostname);
645
646	if (he
647	&& he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0])
648	{
649	//sa->sin_family = he->h_addrtype;
650	memcpy (&sa->sin_addr, he->h_addr_list[0], 4);
651	}
652	else
653	slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname);
654	}
655	}
656
657	void
658	connection::reset_dstaddr ()	650	connection::reset_dstaddr ()
659	{	651	{
660	fill_sa (&sa, conf);	652	si.set (conf);
661	}	653	}
662		654
663	void	655	void
664	connection::send_ping (SOCKADDR *dsa, u8 pong)	656	connection::send_ping (const sockinfo &si, u8 pong)
665	{	657	{
666	ping_packet *pkt = new ping_packet;	658	ping_packet *pkt = new ping_packet;
667		659
668	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	660	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
669	vpn->send_vpn_packet (pkt, dsa, IPTOS_LOWDELAY);	661	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		662
671	delete pkt;	663	delete pkt;
672	}	664	}
673		665
674	void	666	void
675	connection::send_reset (SOCKADDR *dsa)	667	connection::send_reset (const sockinfo &si)
676	{	668	{
677	static net_rate_limiter limiter(1);
678
679	if (limiter.can (dsa) && connectmode != conf_node::C_DISABLED)	669	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
680	{	670	{
681	config_packet *pkt = new config_packet;	671	config_packet *pkt = new config_packet;
682		672
683	pkt->setup (vpn_packet::PT_RESET, conf->id);	673	pkt->setup (vpn_packet::PT_RESET, conf->id);
684	vpn->send_vpn_packet (pkt, dsa, IPTOS_MINCOST);	674	send_vpn_packet (pkt, si, IPTOS_MINCOST);
685		675
686	delete pkt;	676	delete pkt;
687	}	677	}
688	}	678	}
689		679
690	static rsachallenge *
691	gen_challenge (u32 seqrand, SOCKADDR *sa)
692	{
693	static rsachallenge k;
694
695	memcpy (&k, &challenge_bytes (), sizeof (k));
696	*(u32 *)&k[CHG_SEQNO] ^= seqrand;
697	xor_sa (k, sa);
698
699	return &k;
700	}
701
702	void	680	void
703	connection::send_auth (auth_subtype subtype, SOCKADDR *sa, const rsachallenge *k)	681	connection::send_auth_request (const sockinfo &si, bool initiate)
704	{	682	{
705	static net_rate_limiter limiter(0.2);	683	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->can_recv);
706		684
707	if (subtype != AUTH_INIT || limiter.can (sa))	685	// the next line is very conservative
708	{	686	prot_send = best_protocol (THISNODE->can_send & THISNODE->can_recv & conf->can_recv);
709	if (!k)
710	k = gen_challenge (seqrand, sa);
711		687
712	auth_packet *pkt = new auth_packet (conf->id, subtype);	688	rsachallenge chg;
713		689
714	memcpy (pkt->challenge, rsa_cache.public_encrypt (conf->rsa_key, *k), sizeof (rsaencrdata));	690	rsa_cache.gen (pkt->id, chg);
715		691
		692	if (0 > RSA_public_encrypt (sizeof chg,
		693	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
		694	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
		695	fatal ("RSA_public_encrypt error");
		696
716	slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa));	697	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
717		698
718	vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY);	699	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
719		700
720	delete pkt;	701	delete pkt;
721	}	702	}
		703
		704	void
		705	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
		706	{
		707	auth_res_packet *pkt = new auth_res_packet (conf->id);
		708
		709	pkt->id = id;
		710
		711	rsa_hash (id, chg, pkt->response);
		712
		713	pkt->hmac_set (octx);
		714
		715	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
		716
		717	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		718
		719	delete pkt;
722	}	720	}
723		721
724	void	722	void
725	connection::establish_connection_cb (tstamp &ts)	723	connection::establish_connection_cb (tstamp &ts)
726	{	724	{
727	if (ictx || conf == THISNODE || connectmode == conf_node::C_NEVER)	725	if (ictx || conf == THISNODE
		726	|| connectmode == conf_node::C_NEVER
		727	|| connectmode == conf_node::C_DISABLED)
728	ts = TSTAMP_CANCEL;	728	ts = TSTAMP_CANCEL;
729	else if (ts <= NOW)	729	else if (ts <= NOW)
730	{	730	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.25;	731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
732		732
733	if (retry_int < 3600 * 8)	733	if (retry_int < 3600 * 8)
734	retry_cnt++;	734	retry_cnt++;
735		735
736	if (connectmode == conf_node::C_ONDEMAND
737	&& retry_int > ::conf.keepalive)
738	retry_int = ::conf.keepalive;
739
740	ts = NOW + retry_int;	736	ts = NOW + retry_int;
741		737
742	if (conf->hostname)	738	if (conf->hostname)
743	{	739	{
744	reset_dstaddr ();	740	reset_dstaddr ();
745	if (sa.sin_addr.s_addr)	741	if (si.host && auth_rate_limiter.can (si))
		742	{
746	if (retry_cnt < 4)	743	if (retry_cnt < 4)
747	send_auth (AUTH_INIT, &sa);	744	send_auth_request (si, true);
748	else	745	else
749	send_ping (&sa, 0);	746	send_ping (si, 0);
		747	}
750	}	748	}
751	else	749	else
752	vpn->connect_request (conf->id);	750	vpn->connect_request (conf->id);
753	}	751	}
754	}	752	}
…		…
756	void	754	void
757	connection::reset_connection ()	755	connection::reset_connection ()
758	{	756	{
759	if (ictx && octx)	757	if (ictx && octx)
760	{	758	{
761	slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename);	759	slog (L_INFO, _("%s(%s): connection lost"),
		760	conf->nodename, (const char *)si);
762		761
763	if (::conf.script_node_down)	762	if (::conf.script_node_down)
764	run_script (this, &connection::script_node_down, false);	763	run_script (run_script_cb (this, &connection::script_node_down), false);
765	}	764	}
766		765
767	delete ictx; ictx = 0;	766	delete ictx; ictx = 0;
768	delete octx; octx = 0;	767	delete octx; octx = 0;
769		768
770	RAND_bytes ((unsigned char *)&seqrand, sizeof (u32));	769	si.host= 0;
771
772	sa.sin_port = 0;
773	sa.sin_addr.s_addr = 0;
774		770
775	last_activity = 0;	771	last_activity = 0;
		772	retry_cnt = 0;
776		773
777	rekey.reset ();	774	rekey.reset ();
778	keepalive.reset ();	775	keepalive.reset ();
779	establish_connection.reset ();	776	establish_connection.reset ();
780	}	777	}
781		778
782	void	779	void
783	connection::shutdown ()	780	connection::shutdown ()
784	{	781	{
785	if (ictx && octx)	782	if (ictx && octx)
786	send_reset (&sa);	783	send_reset (si);
787		784
788	reset_connection ();	785	reset_connection ();
789	}	786	}
790		787
791	void	788	void
…		…
796	reset_connection ();	793	reset_connection ();
797	establish_connection ();	794	establish_connection ();
798	}	795	}
799		796
800	void	797	void
801	connection::send_data_packet (tap_packet * pkt, bool broadcast)	798	connection::send_data_packet (tap_packet *pkt, bool broadcast)
802	{	799	{
803	vpndata_packet *p = new vpndata_packet;	800	vpndata_packet *p = new vpndata_packet;
804	int tos = 0;	801	int tos = 0;
805		802
806	if (conf->inherit_tos	803	if (conf->inherit_tos
807	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	804	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
808	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4	805	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
809	tos = (*pkt)[15] & IPTOS_TOS_MASK;	806	tos = (*pkt)[15] & IPTOS_TOS_MASK;
810		807
811	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	808	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
812	vpn->send_vpn_packet (p, &sa, tos);	809	send_vpn_packet (p, si, tos);
813		810
814	delete p;	811	delete p;
815		812
816	if (oseqno > MAX_SEQNO)	813	if (oseqno > MAX_SEQNO)
817	rekey ();	814	rekey ();
…		…
830	establish_connection ();	827	establish_connection ();
831	}	828	}
832	}	829	}
833		830
834	void	831	void
835	connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa)	832	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
836	{	833	{
837	last_activity = NOW;	834	last_activity = NOW;
838		835
839	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	836	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
840	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	837	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
841		838
842	switch (pkt->typ ())	839	switch (pkt->typ ())
843	{	840	{
844	case vpn_packet::PT_PING:	841	case vpn_packet::PT_PING:
		842	// we send pings instead of auth packets after some retries,
		843	// so reset the retry counter and establish a connection
		844	// when we receive a ping.
		845	if (!ictx)
		846	{
		847	if (auth_rate_limiter.can (rsi))
		848	send_auth_request (rsi, true);
		849	}
		850	else
845	send_ping (ssa, 1); // pong	851	send_ping (rsi, 1); // pong
		852
846	break;	853	break;
847		854
848	case vpn_packet::PT_PONG:	855	case vpn_packet::PT_PONG:
849	// we send pings instead of auth packets after some retries,
850	// so reset the retry counter and establish a conenction
851	// when we receive a pong.
852	if (!ictx && !octx)
853	{
854	retry_cnt = 0;
855	establish_connection.at = 0;
856	establish_connection ();
857	}
858
859	break;	856	break;
860		857
861	case vpn_packet::PT_RESET:	858	case vpn_packet::PT_RESET:
862	{	859	{
863	reset_connection ();	860	reset_connection ();
864		861
865	config_packet *p = (config_packet *) pkt;	862	config_packet *p = (config_packet *) pkt;
		863
866	if (!p->chk_config ())	864	if (!p->chk_config ())
867	{	865	{
868	slog (L_WARN, _("protocol mismatch, disabling node '%s'"), conf->nodename);	866	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		867	conf->nodename, (const char *)rsi);
869	connectmode = conf_node::C_DISABLED;	868	connectmode = conf_node::C_DISABLED;
870	}	869	}
871	else if (connectmode == conf_node::C_ALWAYS)	870	else if (connectmode == conf_node::C_ALWAYS)
872	establish_connection ();	871	establish_connection ();
873	}	872	}
874	break;	873	break;
875		874
876	case vpn_packet::PT_AUTH:	875	case vpn_packet::PT_AUTH_REQ:
		876	if (auth_rate_limiter.can (rsi))
		877	{
		878	auth_req_packet *p = (auth_req_packet *) pkt;
		879
		880	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		881
		882	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		883	{
		884	if (p->prot_minor != PROTOCOL_MINOR)
		885	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		886	conf->nodename, (const char *)rsi,
		887	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		888
		889	if (p->initiate)
		890	send_auth_request (rsi, false);
		891
		892	rsachallenge k;
		893
		894	if (0 > RSA_private_decrypt (sizeof (p->encr),
		895	(unsigned char *)&p->encr, (unsigned char *)&k,
		896	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
		897	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
		898	conf->nodename, (const char *)rsi);
		899	else
		900	{
		901	retry_cnt = 0;
		902	establish_connection.set (NOW + 8); //? ;)
		903	keepalive.reset ();
		904	rekey.reset ();
		905
		906	delete ictx;
		907	ictx = 0;
		908
		909	delete octx;
		910
		911	octx = new crypto_ctx (k, 1);
		912	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
		913
		914	conf->can_recv = p->can_recv;
		915	send_auth_response (rsi, p->id, k);
		916
		917	break;
		918	}
		919	}
		920
		921	send_reset (rsi);
		922	}
		923
		924	break;
		925
		926	case vpn_packet::PT_AUTH_RES:
877	{	927	{
878	auth_packet *p = (auth_packet *) pkt;	928	auth_res_packet *p = (auth_res_packet *) pkt;
879		929
880	slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype);	930	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
881		931
882	if (p->chk_config ()	932	if (p->chk_config ())
883	&& !strncmp (p->magic, MAGIC, 8))
884	{	933	{
885	if (p->prot_minor != PROTOCOL_MINOR)	934	if (p->prot_minor != PROTOCOL_MINOR)
886	slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."),	935	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		936	conf->nodename, (const char *)rsi,
887	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	937	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
888		938
889	if (p->subtype == AUTH_INIT)	939	rsachallenge chg;
890	send_auth (AUTH_INITREPLY, ssa);
891		940
892	const rsachallenge *k = rsa_cache.private_decrypt (::conf.rsa_key, p->challenge);	941	if (!rsa_cache.find (p->id, chg))
893		942	slog (L_ERR, _("%s(%s): unrequested auth response"),
894	if (!k)	943	conf->nodename, (const char *)rsi);
		944	else
895	{	945	{
896	slog (L_ERR, _("challenge from %s (%s) illegal or corrupted, disabling node"),	946	crypto_ctx *cctx = new crypto_ctx (chg, 0);
		947
		948	if (!p->hmac_chk (cctx))
		949	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		950	"could be an attack, or just corruption or an synchronization error"),
897	conf->nodename, (const char *)sockinfo (ssa));	951	conf->nodename, (const char *)rsi);
898	connectmode = conf_node::C_DISABLED;
899	break;	952	else
900	}
901
902	retry_cnt = 0;
903	establish_connection.set (NOW + 8); //? ;)
904	keepalive.reset ();
905	rekey.reset ();
906
907	switch (p->subtype)
908	{
909	case AUTH_INIT:
910	case AUTH_INITREPLY:
911	delete ictx;
912	ictx = 0;
913
914	delete octx;
915
916	octx = new crypto_ctx (*k, 1);
917	oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff;
918
919	send_auth (AUTH_REPLY, ssa, k);
920	break;
921
922	case AUTH_REPLY:
923
924	if (!memcmp ((u8 *)gen_challenge (seqrand, ssa), (u8 *)k, sizeof (rsachallenge)))
925	{	953	{
926	delete ictx;
927
928	ictx = new crypto_ctx (*k, 0);
929	iseqno.reset (*(u32 *)&k[CHG_SEQNO] & 0x7fffffff); // at least 2**31 sequence numbers are valid
930
931	sa = *ssa;	954	rsaresponse h;
932		955
933	rekey.set (NOW + ::conf.rekey);	956	rsa_hash (p->id, chg, h);
934	keepalive.set (NOW + ::conf.keepalive);
935		957
936	// send queued packets	958	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
937	while (tap_packet *p = queue.get ())
938	{	959	{
		960	prot_minor = p->prot_minor;
		961
		962	delete ictx; ictx = cctx;
		963
		964	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		965
		966	si = rsi;
		967
		968	rekey.set (NOW + ::conf.rekey);
		969	keepalive.set (NOW + ::conf.keepalive);
		970
		971	// send queued packets
		972	while (tap_packet *p = queue.get ())
		973	{
939	send_data_packet (p);	974	send_data_packet (p);
940	delete p;	975	delete p;
		976	}
		977
		978	connectmode = conf->connectmode;
		979
		980	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
		981	conf->nodename, (const char *)rsi,
		982	p->prot_major, p->prot_minor);
		983
		984	if (::conf.script_node_up)
		985	run_script (run_script_cb (this, &connection::script_node_up), false);
		986
		987	break;
941	}	988	}
942		989	else
943	connectmode = conf->connectmode;	990	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
944
945	slog (L_INFO, _("connection to %d (%s %s) established"),
946	conf->id, conf->nodename, (const char *)sockinfo (ssa));	991	conf->nodename, (const char *)rsi);
947
948	if (::conf.script_node_up)
949	run_script (this, &connection::script_node_up, false);
950	}	992	}
		993
951	else	994	delete cctx;
952	slog (L_ERR, _("sent and received challenge do not match with (%s %s))"),
953	conf->nodename, (const char *)sockinfo (ssa));
954
955	break;
956	default:
957	slog (L_ERR, _("authentification illegal subtype error (%s %s)"),
958	conf->nodename, (const char *)sockinfo (ssa));
959	break;
960	}	995	}
961	}	996	}
962	else
963	send_reset (ssa);
964
965	break;
966	}	997	}
		998
		999	send_reset (rsi);
		1000	break;
967		1001
968	case vpn_packet::PT_DATA_COMPRESSED:	1002	case vpn_packet::PT_DATA_COMPRESSED:
969	#if !ENABLE_COMPRESSION	1003	#if !ENABLE_COMPRESSION
970	send_reset (ssa);	1004	send_reset (rsi);
971	break;	1005	break;
972	#endif	1006	#endif
		1007
973	case vpn_packet::PT_DATA_UNCOMPRESSED:	1008	case vpn_packet::PT_DATA_UNCOMPRESSED:
974		1009
975	if (ictx && octx)	1010	if (ictx && octx)
976	{	1011	{
977	vpndata_packet *p = (vpndata_packet *)pkt;	1012	vpndata_packet *p = (vpndata_packet *)pkt;
978		1013
979	if (*ssa == sa)	1014	if (rsi == si)
980	{	1015	{
981	if (!p->hmac_chk (ictx))	1016	if (!p->hmac_chk (ictx))
982	slog (L_ERR, _("hmac authentication error, received invalid packet\n"	1017	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
983	"could be an attack, or just corruption or an synchronization error"));	1018	"could be an attack, or just corruption or an synchronization error"),
		1019	conf->nodename, (const char *)rsi);
984	else	1020	else
985	{	1021	{
986	u32 seqno;	1022	u32 seqno;
987	tap_packet *d = p->unpack (this, seqno);	1023	tap_packet *d = p->unpack (this, seqno);
988		1024
…		…
1004	break;	1040	break;
1005	}	1041	}
1006	}	1042	}
1007	}	1043	}
1008	else	1044	else
1009	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D	1045	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
1010	}	1046	}
1011		1047
1012	send_reset (ssa);	1048	send_reset (rsi);
1013	break;	1049	break;
1014		1050
1015	case vpn_packet::PT_CONNECT_REQ:	1051	case vpn_packet::PT_CONNECT_REQ:
1016	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1052	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1017	{	1053	{
1018	connect_req_packet *p = (connect_req_packet *) pkt;	1054	connect_req_packet *p = (connect_req_packet *) pkt;
1019		1055
1020	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1056	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1021		1057
…		…
1027	if (c->ictx && c->octx)	1063	if (c->ictx && c->octx)
1028	{	1064	{
1029	// send connect_info packets to both sides, in case one is	1065	// send connect_info packets to both sides, in case one is
1030	// behind a nat firewall (or both ;)	1066	// behind a nat firewall (or both ;)
1031	{	1067	{
1032	sockinfo si(sa);
1033
1034	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1068	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
1035	c->conf->id, conf->id, (const char *)si);	1069	c->conf->id, conf->id, (const char *)si);
1036		1070
1037	connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si);	1071	connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si, conf->can_recv);
1038		1072
1039	r->hmac_set (c->octx);	1073	r->hmac_set (c->octx);
1040	vpn->send_vpn_packet (r, &c->sa);	1074	send_vpn_packet (r, c->si);
1041		1075
1042	delete r;	1076	delete r;
1043	}	1077	}
1044		1078
1045	{	1079	{
1046	sockinfo si(c->sa);
1047
1048	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1080	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
1049	conf->id, c->conf->id, (const char *)si);	1081	conf->id, c->conf->id, (const char *)c->si);
1050		1082
1051	connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, si);	1083	connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, c->si, c->conf->can_recv);
1052		1084
1053	r->hmac_set (octx);	1085	r->hmac_set (octx);
1054	vpn->send_vpn_packet (r, &sa);	1086	send_vpn_packet (r, si);
1055		1087
1056	delete r;	1088	delete r;
1057	}	1089	}
1058	}	1090	}
1059	}	1091	}
1060		1092
1061	break;	1093	break;
1062		1094
1063	case vpn_packet::PT_CONNECT_INFO:	1095	case vpn_packet::PT_CONNECT_INFO:
1064	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1096	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1065	{	1097	{
1066	connect_info_packet *p = (connect_info_packet *) pkt;	1098	connect_info_packet *p = (connect_info_packet *) pkt;
1067		1099
1068	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1100	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1069		1101
1070	connection *c = vpn->conns[p->id - 1];	1102	connection *c = vpn->conns[p->id - 1];
1071		1103
1072	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1104	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1073	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1105	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1074		1106
1075	c->send_auth (AUTH_INIT, p->si.sa ());	1107	c->conf->can_recv = p->can_recv;
		1108	c->send_auth_request (p->si, true);
1076	}	1109	}
		1110
1077	break;	1111	break;
1078		1112
1079	default:	1113	default:
1080	send_reset (ssa);	1114	send_reset (rsi);
1081	break;	1115	break;
		1116
1082	}	1117	}
1083	}	1118	}
1084		1119
1085	void connection::keepalive_cb (tstamp &ts)	1120	void connection::keepalive_cb (tstamp &ts)
1086	{	1121	{
…		…
1090	establish_connection ();	1125	establish_connection ();
1091	}	1126	}
1092	else if (NOW < last_activity + ::conf.keepalive)	1127	else if (NOW < last_activity + ::conf.keepalive)
1093	ts = last_activity + ::conf.keepalive;	1128	ts = last_activity + ::conf.keepalive;
1094	else if (conf->connectmode != conf_node::C_ONDEMAND	1129	else if (conf->connectmode != conf_node::C_ONDEMAND
1095	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1130	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1096	{	1131	{
1097	send_ping (&sa);	1132	send_ping (si);
1098	ts = NOW + 5;	1133	ts = NOW + 5;
1099	}	1134	}
1100	else	1135	else
1101	reset_connection ();	1136	reset_connection ();
1102
1103	}	1137	}
1104		1138
1105	void connection::connect_request (int id)	1139	void connection::connect_request (int id)
1106	{	1140	{
1107	connect_req_packet *p = new connect_req_packet (conf->id, id);	1141	connect_req_packet *p = new connect_req_packet (conf->id, id);
1108		1142
1109	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);	1143	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);
1110	p->hmac_set (octx);	1144	p->hmac_set (octx);
1111	vpn->send_vpn_packet (p, &sa);	1145	send_vpn_packet (p, si);
1112		1146
1113	delete p;	1147	delete p;
1114	}	1148	}
1115		1149
1116	void connection::script_node ()	1150	void connection::script_node ()
1117	{	1151	{
1118	vpn->script_if_up ();	1152	vpn->script_if_up (0);
1119		1153
1120	char *env;	1154	char *env;
1121	asprintf (&env, "DESTID=%d", conf->id);	1155	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1122	putenv (env);
1123	asprintf (&env, "DESTNODE=%s", conf->nodename);	1156	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1124	putenv (env);	1157	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1125	asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr));
1126	putenv (env);
1127	asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port));	1158	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1128	putenv (env);
1129	}	1159	}
1130		1160
1131	const char *connection::script_node_up ()	1161	const char *connection::script_node_up (int)
1132	{	1162	{
1133	script_node ();	1163	script_node ();
1134		1164
1135	putenv ("STATE=up");	1165	putenv ("STATE=up");
1136		1166
1137	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1167	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1138	}	1168	}
1139		1169
1140	const char *connection::script_node_down ()	1170	const char *connection::script_node_down (int)
1141	{	1171	{
1142	script_node ();	1172	script_node ();
1143		1173
1144	putenv ("STATE=down");	1174	putenv ("STATE=down");
1145		1175
1146	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1176	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
		1177	}
		1178
		1179	// send a vpn packet out to other hosts
		1180	void
		1181	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1182	{
		1183	if (prot_send & PROT_IPv4)
		1184	vpn->send_ipv4_packet (pkt, si, tos);
		1185	else
		1186	vpn->send_udpv4_packet (pkt, si, tos);
1147	}	1187	}
1148		1188
1149	connection::connection(struct vpn *vpn_)	1189	connection::connection(struct vpn *vpn_)
1150	: vpn(vpn_)	1190	: vpn(vpn_)
1151	, rekey (this, &connection::rekey_cb)	1191	, rekey (this, &connection::rekey_cb)
…		…
1164	shutdown ();	1204	shutdown ();
1165	}	1205	}
1166		1206
1167	/////////////////////////////////////////////////////////////////////////////	1207	/////////////////////////////////////////////////////////////////////////////
1168		1208
1169	const char *vpn::script_if_up ()	1209	const char *vpn::script_if_up (int)
1170	{	1210	{
1171	// the tunnel device mtu should be the physical mtu - overhead	1211	// the tunnel device mtu should be the physical mtu - overhead
1172	// the tricky part is rounding to the cipher key blocksize	1212	// the tricky part is rounding to the cipher key blocksize
1173	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD;	1213	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
1174	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	1214	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
1175	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	1215	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
1176	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	1216	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
1177		1217
1178	char *env;	1218	char *env;
…		…
1193		1233
1194	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	1234	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
1195	}	1235	}
1196		1236
1197	int	1237	int
1198	vpn::setup (void)	1238	vpn::setup ()
1199	{	1239	{
1200	struct sockaddr_in sa;	1240	u8 prots = 0;
1201		1241
		1242	for (configuration::node_vector::iterator i = conf.nodes.begin ();
		1243	i != conf.nodes.end (); ++i)
		1244	prots |= (*i)->can_send | (*i)->can_recv;
		1245
		1246	sockinfo si;
		1247
		1248	si.set (THISNODE);
		1249
		1250	udpv4_fd = -1;
		1251
		1252	if (prots & PROT_UDPv4)
		1253	{
1202	socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	1254	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
1203	if (socket_fd < 0)	1255
		1256	if (udpv4_fd < 0)
1204	return -1;	1257	return -1;
1205		1258
1206	fill_sa (&sa, THISNODE);	1259	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
1207		1260	{
1208	if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa)))
1209	{
1210	slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno));	1261	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
1211	exit (1);	1262	exit (1);
1212	}	1263	}
1213		1264
1214	#ifdef IP_MTU_DISCOVER	1265	#ifdef IP_MTU_DISCOVER
1215	// this I really consider a linux bug. I am neither connected	1266	// this I really consider a linux bug. I am neither connected
1216	// nor do I fragment myself. Linux still sets DF and doesn't	1267	// nor do I fragment myself. Linux still sets DF and doesn't
1217	// fragment for me sometimes.	1268	// fragment for me sometimes.
1218	{	1269	{
1219	int oval = IP_PMTUDISC_DONT;	1270	int oval = IP_PMTUDISC_DONT;
1220	setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	1271	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
1221	}	1272	}
1222	#endif	1273	#endif
1223	{	1274
		1275	// standard daemon practise...
		1276	{
1224	int oval = 1;	1277	int oval = 1;
1225	setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	1278	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
1226	}	1279	}
1227		1280
1228	udp_ev_watcher.start (socket_fd, POLLIN);	1281	udpv4_ev_watcher.start (udpv4_fd, POLLIN);
		1282	}
		1283
		1284	ipv4_fd = -1;
		1285	if (prots & PROT_IPv4)
		1286	{
		1287	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		1288
		1289	if (ipv4_fd < 0)
		1290	return -1;
		1291
		1292	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		1293	{
		1294	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
		1295	exit (1);
		1296	}
		1297
		1298	#ifdef IP_MTU_DISCOVER
		1299	// this I really consider a linux bug. I am neither connected
		1300	// nor do I fragment myself. Linux still sets DF and doesn't
		1301	// fragment for me sometimes.
		1302	{
		1303	int oval = IP_PMTUDISC_DONT;
		1304	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		1305	}
		1306	#endif
		1307
		1308	ipv4_ev_watcher.start (ipv4_fd, POLLIN);
		1309	}
1229		1310
1230	tap = new tap_device ();	1311	tap = new tap_device ();
1231	if (!tap) //D this, of course, never catches	1312	if (!tap) //D this, of course, never catches
1232	{	1313	{
1233	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	1314	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
1234	exit (1);	1315	exit (1);
1235	}	1316	}
1236		1317
1237	run_script (this, &vpn::script_if_up, true);	1318	run_script (run_script_cb (this, &vpn::script_if_up), true);
1238		1319
1239	vpn_ev_watcher.start (tap->fd, POLLIN);	1320	tap_ev_watcher.start (tap->fd, POLLIN);
1240		1321
1241	reconnect_all ();	1322	reconnect_all ();
1242		1323
1243	return 0;	1324	return 0;
1244	}	1325	}
1245		1326
1246	void	1327	void
1247	vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos)	1328	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1248	{	1329	{
1249	setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	1330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
1250	sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa));	1331	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
1251	}	1332	}
1252		1333
1253	void	1334	void
1254	vpn::shutdown_all ()	1335	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1255	{	1336	{
1256	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1337	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
1257	(*c)->shutdown ();	1338	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
1258	}	1339	}
1259		1340
1260	void	1341	void
1261	vpn::reconnect_all ()	1342	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
1262	{	1343	{
1263	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1344	unsigned int src = pkt->src ();
1264	delete *c;	1345	unsigned int dst = pkt->dst ();
1265		1346
1266	conns.clear ();	1347	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
		1348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
1267		1349
1268	for (configuration::node_vector::iterator i = conf.nodes.begin ();	1350	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
1269	i != conf.nodes.end (); ++i)	1351	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
1270	{	1352	pkt->typ (), pkt->src (), pkt->dst ());
1271	connection *conn = new connection (this);	1353	else if (dst == 0 && !THISNODE->routerprio)
1272		1354	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
1273	conn->conf = *i;	1355	else if (dst != 0 && dst != THISNODE->id)
1274	conns.push_back (conn);	1356	slog (L_WARN,
1275		1357	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
1276	conn->establish_connection ();	1358	dst, conns[dst - 1]->conf->nodename,
1277	}	1359	(const char *)rsi,
		1360	THISNODE->id, THISNODE->nodename);
		1361	else if (src == 0 || src > conns.size ())
		1362	slog (L_WARN, _("received frame from unknown node %d (%s)"),
		1363	src, (const char *)rsi);
		1364	else
		1365	conns[src - 1]->recv_vpn_packet (pkt, rsi);
1278	}	1366	}
1279		1367
1280	connection *vpn::find_router ()
1281	{
1282	u32 prio = 0;
1283	connection *router = 0;
1284
1285	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
1286	{
1287	connection *c = *i;
1288
1289	if (c->conf->routerprio > prio
1290	&& c->connectmode == conf_node::C_ALWAYS
1291	&& c->conf != THISNODE
1292	&& c->ictx && c->octx)
1293	{
1294	prio = c->conf->routerprio;
1295	router = c;
1296	}
1297	}
1298
1299	return router;
1300	}
1301
1302	void vpn::connect_request (int id)
1303	{
1304	connection *c = find_router ();
1305
1306	if (c)
1307	c->connect_request (id);
1308	//else // does not work, because all others must connect to the same router
1309	// // no router found, aggressively connect to all routers
1310	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
1311	// if ((*i)->conf->routerprio)
1312	// (*i)->establish_connection ();
1313	}
1314
1315	void	1368	void
1316	vpn::udp_ev (short revents)	1369	vpn::udpv4_ev (short revents)
1317	{	1370	{
1318	if (revents & (POLLIN | POLLERR))	1371	if (revents & (POLLIN | POLLERR))
1319	{	1372	{
1320	vpn_packet *pkt = new vpn_packet;	1373	vpn_packet *pkt = new vpn_packet;
1321	struct sockaddr_in sa;	1374	struct sockaddr_in sa;
1322	socklen_t sa_len = sizeof (sa);	1375	socklen_t sa_len = sizeof (sa);
1323	int len;	1376	int len;
1324		1377
1325	len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);	1378	len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1379
		1380	sockinfo si(sa);
1326		1381
1327	if (len > 0)	1382	if (len > 0)
1328	{	1383	{
1329	pkt->len = len;	1384	pkt->len = len;
1330		1385
1331	unsigned int src = pkt->src ();
1332	unsigned int dst = pkt->dst ();
1333
1334	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
1335	(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
1336
1337	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
1338	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
1339	pkt->typ (), pkt->src (), pkt->dst ());
1340	else if (dst == 0 && !THISNODE->routerprio)
1341	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
1342	else if (dst != 0 && dst != THISNODE->id)
1343	slog (L_WARN,
1344	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
1345	dst, conns[dst - 1]->conf->nodename,
1346	(const char *)sockinfo (sa),
1347	THISNODE->id, THISNODE->nodename);
1348	else if (src == 0 || src > conns.size ())
1349	slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa));
1350	else
1351	conns[src - 1]->recv_vpn_packet (pkt, &sa);	1386	recv_vpn_packet (pkt, si);
1352	}	1387	}
1353	else	1388	else
1354	{	1389	{
1355	// probably ECONNRESET or somesuch	1390	// probably ECONNRESET or somesuch
1356	slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno));	1391	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
1357	}	1392	}
1358		1393
1359	delete pkt;	1394	delete pkt;
1360	}	1395	}
1361	else if (revents & POLLHUP)	1396	else if (revents & POLLHUP)
1362	{	1397	{
1363	// this cannot ;) happen on udp sockets	1398	// this cannot ;) happen on udp sockets
1364	slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating."));	1399	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
1365	exit (1);	1400	exit (1);
1366	}	1401	}
1367	else	1402	else
1368	{	1403	{
1369	slog (L_ERR,	1404	slog (L_ERR,
…		…
1372	exit (1);	1407	exit (1);
1373	}	1408	}
1374	}	1409	}
1375		1410
1376	void	1411	void
		1412	vpn::ipv4_ev (short revents)
		1413	{
		1414	if (revents & (POLLIN | POLLERR))
		1415	{
		1416	vpn_packet *pkt = new vpn_packet;
		1417	struct sockaddr_in sa;
		1418	socklen_t sa_len = sizeof (sa);
		1419	int len;
		1420
		1421	len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1422
		1423	sockinfo si(sa, PROT_IPv4);
		1424
		1425	if (len > 0)
		1426	{
		1427	pkt->len = len;
		1428
		1429	// raw sockets deliver the ipv4, but don't expect it on sends
		1430	// this is slow, but...
		1431	pkt->skip_hdr (IP_OVERHEAD);
		1432
		1433	recv_vpn_packet (pkt, si);
		1434	}
		1435	else
		1436	{
		1437	// probably ECONNRESET or somesuch
		1438	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1439	}
		1440
		1441	delete pkt;
		1442	}
		1443	else if (revents & POLLHUP)
		1444	{
		1445	// this cannot ;) happen on udp sockets
		1446	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
		1447	exit (1);
		1448	}
		1449	else
		1450	{
		1451	slog (L_ERR,
		1452	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1453	revents);
		1454	exit (1);
		1455	}
		1456	}
		1457
		1458	void
1377	vpn::vpn_ev (short revents)	1459	vpn::tap_ev (short revents)
1378	{	1460	{
1379	if (revents & POLLIN)	1461	if (revents & POLLIN)
1380	{	1462	{
1381	/* process data */	1463	/* process data */
1382	tap_packet *pkt;	1464	tap_packet *pkt;
…		…
1438	{	1520	{
1439	if (events)	1521	if (events)
1440	{	1522	{
1441	if (events & EVENT_SHUTDOWN)	1523	if (events & EVENT_SHUTDOWN)
1442	{	1524	{
		1525	slog (L_INFO, _("preparing shutdown..."));
		1526
1443	shutdown_all ();	1527	shutdown_all ();
1444		1528
1445	remove_pid (pidfilename);	1529	remove_pid (pidfilename);
1446		1530
1447	slog (L_INFO, _("vped terminating"));	1531	slog (L_INFO, _("terminating"));
1448		1532
1449	exit (0);	1533	exit (0);
1450	}	1534	}
1451		1535
1452	if (events & EVENT_RECONNECT)	1536	if (events & EVENT_RECONNECT)
		1537	{
		1538	slog (L_INFO, _("forced reconnect"));
		1539
1453	reconnect_all ();	1540	reconnect_all ();
		1541	}
1454		1542
1455	events = 0;	1543	events = 0;
1456	}	1544	}
1457		1545
1458	ts = TSTAMP_CANCEL;	1546	ts = TSTAMP_CANCEL;
1459	}	1547	}
1460		1548
		1549	void
		1550	vpn::shutdown_all ()
		1551	{
		1552	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1553	(*c)->shutdown ();
		1554	}
		1555
		1556	void
		1557	vpn::reconnect_all ()
		1558	{
		1559	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1560	delete *c;
		1561
		1562	conns.clear ();
		1563
		1564	auth_rate_limiter.clear ();
		1565	reset_rate_limiter.clear ();
		1566
		1567	for (configuration::node_vector::iterator i = conf.nodes.begin ();
		1568	i != conf.nodes.end (); ++i)
		1569	{
		1570	connection *conn = new connection (this);
		1571
		1572	conn->conf = *i;
		1573	conns.push_back (conn);
		1574
		1575	conn->establish_connection ();
		1576	}
		1577	}
		1578
		1579	connection *vpn::find_router ()
		1580	{
		1581	u32 prio = 0;
		1582	connection *router = 0;
		1583
		1584	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		1585	{
		1586	connection *c = *i;
		1587
		1588	if (c->conf->routerprio > prio
		1589	&& c->connectmode == conf_node::C_ALWAYS
		1590	&& c->conf != THISNODE
		1591	&& c->ictx && c->octx)
		1592	{
		1593	prio = c->conf->routerprio;
		1594	router = c;
		1595	}
		1596	}
		1597
		1598	return router;
		1599	}
		1600
		1601	void vpn::connect_request (int id)
		1602	{
		1603	connection *c = find_router ();
		1604
		1605	if (c)
		1606	c->connect_request (id);
		1607	//else // does not work, because all others must connect to the same router
		1608	// // no router found, aggressively connect to all routers
		1609	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		1610	// if ((*i)->conf->routerprio)
		1611	// (*i)->establish_connection ();
		1612	}
		1613
		1614	void
		1615	connection::dump_status ()
		1616	{
		1617	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
		1618	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
		1619	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
		1620	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
		1621	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
		1622	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
		1623	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
		1624	}
		1625
		1626	void
		1627	vpn::dump_status ()
		1628	{
		1629	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
		1630
		1631	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1632	(*c)->dump_status ();
		1633
		1634	slog (L_NOTICE, _("END status dump"));
		1635	}
		1636
1461	vpn::vpn (void)	1637	vpn::vpn (void)
1462	: udp_ev_watcher (this, &vpn::udp_ev)	1638	: udpv4_ev_watcher(this, &vpn::udpv4_ev)
		1639	, ipv4_ev_watcher(this, &vpn::ipv4_ev)
1463	, vpn_ev_watcher (this, &vpn::vpn_ev)	1640	, tap_ev_watcher(this, &vpn::tap_ev)
1464	, event (this, &vpn::event_cb)	1641	, event(this, &vpn::event_cb)
1465	{	1642	{
1466	}	1643	}
1467		1644
1468	vpn::~vpn ()	1645	vpn::~vpn ()
1469	{	1646	{

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