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Comparing gvpe/src/protocol.C (file contents):
Revision 1.9 by pcg, Fri Mar 21 23:17:01 2003 UTC vs.
Revision 1.21 by pcg, Fri Mar 28 04:05:10 2003 UTC

…		…
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	17	*/
18		18
19	#include "config.h"	19	#include "config.h"
20		20
		21	#include <list>
		22
21	#include <cstdlib>	23	#include <cstdlib>
22	#include <cstring>	24	#include <cstring>
23	#include <cstdio>	25	#include <cstdio>
24		26
25	#include <sys/types.h>	27	#include <sys/types.h>
…		…
56		58
57	static time_t next_timecheck;	59	static time_t next_timecheck;
58		60
59	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	61	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
60		62
61	static const rsachallenge &	63	static u8
62	challenge_bytes ()	64	best_protocol (u8 protset)
63	{	65	{
64	static rsachallenge challenge;	66	if (protset & PROT_IPv4)
65	static double challenge_ttl; // time this challenge needs to be recreated	67	return PROT_IPv4;
66		68
67	if (NOW > challenge_ttl)	69	return PROT_UDPv4;
68	{
69	RAND_bytes ((unsigned char *)&challenge, sizeof (challenge));
70	challenge_ttl = NOW + CHALLENGE_TTL;
71	}
72
73	return challenge;
74	}
75
76	// run a script. yes, it's a template function. yes, c++
77	// is not a functional language. yes, this suxx.
78	template<class owner>
79	static void
80	run_script (owner *obj, const char *(owner::*setup)(), bool wait)
81	{
82	int pid;
83
84	if ((pid = fork ()) == 0)
85	{
86	char *filename;
87	asprintf (&filename, "%s/%s", confbase, (obj->*setup) ());
88	execl (filename, filename, (char *) 0);
89	exit (255);
90	}
91	else if (pid > 0)
92	{
93	if (wait)
94	{
95	waitpid (pid, 0, 0);
96	/* TODO: check status */
97	}
98	}
99	}
100
101	// xor the socket address into the challenge to ensure different challenges
102	// per host. we could rely on the OAEP padding, but this doesn't hurt.
103	void
104	xor_sa (rsachallenge &k, SOCKADDR *sa)
105	{
106	((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr;
107	((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port;
108	((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr;
109	((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port;
110	}	70	}
111		71
112	struct crypto_ctx	72	struct crypto_ctx
113	{	73	{
114	EVP_CIPHER_CTX cctx;	74	EVP_CIPHER_CTX cctx;
115	HMAC_CTX hctx;	75	HMAC_CTX hctx;
116		76
117	crypto_ctx (rsachallenge &challenge, int enc);	77	crypto_ctx (const rsachallenge &challenge, int enc);
118	~crypto_ctx ();	78	~crypto_ctx ();
119	};	79	};
120		80
121	crypto_ctx::crypto_ctx (rsachallenge &challenge, int enc)	81	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
122	{	82	{
123	EVP_CIPHER_CTX_init (&cctx);	83	EVP_CIPHER_CTX_init (&cctx);
124	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	84	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);
125	HMAC_CTX_init (&hctx);	85	HMAC_CTX_init (&hctx);
126	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	86	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
…		…
130	{	90	{
131	EVP_CIPHER_CTX_cleanup (&cctx);	91	EVP_CIPHER_CTX_cleanup (&cctx);
132	HMAC_CTX_cleanup (&hctx);	92	HMAC_CTX_cleanup (&hctx);
133	}	93	}
134		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
135	//////////////////////////////////////////////////////////////////////////////	201	//////////////////////////////////////////////////////////////////////////////
136		202
137	void pkt_queue::put (tap_packet *p)	203	void pkt_queue::put (tap_packet *p)
138	{	204	{
139	if (queue[i])	205	if (queue[i])
…		…
171	{	237	{
172	for (i = QUEUEDEPTH; --i > 0; )	238	for (i = QUEUEDEPTH; --i > 0; )
173	delete queue[i];	239	delete queue[i];
174	}	240	}
175		241
		242	struct net_rateinfo {
		243	u32 host;
		244	double pcnt, diff;
		245	tstamp last;
		246	};
		247
176	// only do action once every x seconds per host.	248	// only do action once every x seconds per host whole allowing bursts.
177	// currently this is quite a slow implementation,	249	// this implementation ("splay list" ;) is inefficient,
178	// but suffices for normal operation.	250	// but low on resources.
179	struct u32_rate_limiter : private map<u32, tstamp>	251	struct net_rate_limiter : list<net_rateinfo>
180	{	252	{
181	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
182		256
		257	bool can (const sockinfo &si) { return can((u32)si.host); }
183	bool can (u32 host);	258	bool can (u32 host);
184
185	u32_rate_limiter (tstamp every = 1)
186	{
187	this->every = every;
188	}
189	};	259	};
190		260
191	struct net_rate_limiter : u32_rate_limiter	261	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
192	{
193	bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); }
194	bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); }
195		262
196	net_rate_limiter (tstamp every) : u32_rate_limiter (every) {}
197	};
198
199	bool u32_rate_limiter::can (u32 host)	263	bool net_rate_limiter::can (u32 host)
200	{	264	{
201	iterator i;	265	iterator i;
202		266
203	for (i = begin (); i != end (); )	267	for (i = begin (); i != end (); )
204	if (i->second <= NOW)	268	if (i->host == host)
205	{	269	break;
		270	else if (i->last < NOW - EXPIRE)
206	erase (i);	271	i = erase (i);
207	i = begin ();
208	}
209	else	272	else
210	++i;	273	i++;
211		274
212	i = find (host);
213
214	if (i != end ())	275	if (i == end ())
215	return false;	276	{
		277	net_rateinfo ri;
216		278
217	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;
218		283
		284	push_front (ri);
		285
219	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	}
220	}	307	}
221		308
222	/////////////////////////////////////////////////////////////////////////////	309	/////////////////////////////////////////////////////////////////////////////
223		310
224	static void next_wakeup (time_t next)	311	static void next_wakeup (time_t next)
…		…
228	}	315	}
229		316
230	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];	317	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
231		318
232	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)
233	{	328	{
234	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
235
236	void hmac_set (crypto_ctx * ctx);
237	bool hmac_chk (crypto_ctx * ctx);
238
239	private:
240	void hmac_gen (crypto_ctx * ctx)
241	{
242	unsigned int xlen;	329	unsigned int xlen;
243	HMAC_CTX *hctx = &ctx->hctx;	330	HMAC_CTX *hctx = &ctx->hctx;
244		331
245	HMAC_Init_ex (hctx, 0, 0, 0, 0);	332	HMAC_Init_ex (hctx, 0, 0, 0, 0);
246	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	333	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
247	len - sizeof (hmac_packet));	334	len - sizeof (hmac_packet));
248	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	335	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
249	}
250	};	336	}
		337	};
251		338
252	void	339	void
253	hmac_packet::hmac_set (crypto_ctx * ctx)	340	hmac_packet::hmac_set (crypto_ctx * ctx)
254	{	341	{
255	hmac_gen (ctx);	342	hmac_gen (ctx);
…		…
271	{	358	{
272	PT_RESET = 0,	359	PT_RESET = 0,
273	PT_DATA_UNCOMPRESSED,	360	PT_DATA_UNCOMPRESSED,
274	PT_DATA_COMPRESSED,	361	PT_DATA_COMPRESSED,
275	PT_PING, PT_PONG, // wasting namespace space? ;)	362	PT_PING, PT_PONG, // wasting namespace space? ;)
276	PT_AUTH, // authentification	363	PT_AUTH_REQ, // authentification request
		364	PT_AUTH_RES, // authentification response
277	PT_CONNECT_REQ, // want other host to contact me	365	PT_CONNECT_REQ, // want other host to contact me
278	PT_CONNECT_INFO, // request connection to some node	366	PT_CONNECT_INFO, // request connection to some node
279	PT_REKEY, // rekeying (not yet implemented)
280	PT_MAX	367	PT_MAX
281	};	368	};
282		369
283	u8 type;	370	u8 type;
284	u8 srcdst, src1, dst1;	371	u8 srcdst, src1, dst1;
285		372
286	void set_hdr (ptype type, unsigned int dst);	373	void set_hdr (ptype type, unsigned int dst);
287		374
288	unsigned int src ()	375	unsigned int src () const
289	{	376	{
290	return src1 | ((srcdst >> 4) << 8);	377	return src1 | ((srcdst >> 4) << 8);
291	}	378	}
292		379
293	unsigned int dst ()	380	unsigned int dst () const
294	{	381	{
295	return dst1 | ((srcdst & 0xf) << 8);	382	return dst1 | ((srcdst & 0xf) << 8);
296	}	383	}
297		384
298	ptype typ ()	385	ptype typ () const
299	{	386	{
300	return (ptype) type;	387	return (ptype) type;
301	}	388	}
302	};	389	};
303		390
…		…
352	}	439	}
353	#endif	440	#endif
354		441
355	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	442	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);
356		443
		444	struct {
357	#if RAND_SIZE	445	#if RAND_SIZE
358	struct {
359	u8 rnd[RAND_SIZE];	446	u8 rnd[RAND_SIZE];
		447	#endif
360	u32 seqno;	448	u32 seqno;
361	} datahdr;	449	} datahdr;
362		450
363	datahdr.seqno = seqno;	451	datahdr.seqno = ntohl (seqno);
		452	#if RAND_SIZE
364	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	453	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
		454	#endif
365		455
366	EVP_EncryptUpdate (cctx,	456	EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	457	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	458	(unsigned char *) &datahdr, DATAHDR);
369	outl += outl2;	459	outl += outl2;
370	#else
371	EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &seqno, DATAHDR);
374	outl += outl2;
375	#endif
376		460
377	EVP_EncryptUpdate (cctx,	461	EVP_EncryptUpdate (cctx,
378	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
379	(unsigned char *) d, l);	463	(unsigned char *) d, l);
380	outl += outl2;	464	outl += outl2;
…		…
416	outl += outl2;	500	outl += outl2;
417		501
418	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	502	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);
419	outl += outl2;	503	outl += outl2;
420		504
421	seqno = *(u32 *)(d + RAND_SIZE);	505	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
422		506
423	id2mac (dst () ? dst() : THISNODE->id, p->dst);	507	id2mac (dst () ? dst() : THISNODE->id, p->dst);
424	id2mac (src (), p->src);	508	id2mac (src (), p->src);
425		509
426	#if ENABLE_COMPRESSION	510	#if ENABLE_COMPRESSION
427	if (type == PT_DATA_COMPRESSED)	511	if (type == PT_DATA_COMPRESSED)
428	{	512	{
429	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	513	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];
		514
430	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;
431	}	518	}
432	else	519	else
433	p->len = outl + (6 + 6 - DATAHDR);	520	p->len = outl + (6 + 6 - DATAHDR);
434	#endif	521	#endif
435		522
436	return p;	523	return p;
437	}	524	}
438		525
439	struct ping_packet : vpn_packet	526	struct ping_packet : vpn_packet
		527	{
		528	void setup (int dst, ptype type)
440	{	529	{
441	void setup (int dst, ptype type)
442	{
443	set_hdr (type, dst);	530	set_hdr (type, dst);
444	len = sizeof (*this) - sizeof (net_packet);	531	len = sizeof (*this) - sizeof (net_packet);
445	}
446	};	532	}
		533	};
447		534
448	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
449	{	545	{
450	// actually, hmaclen cannot be checked because the hmac
451	// field comes before this data, so peers with other
452	// hmacs simply will not work.
453	u8 prot_major, prot_minor, randsize, hmaclen;
454	u8 flags, challengelen, pad2, pad3;
455	u32 cipher_nid;
456	u32 digest_nid;
457
458	const u8 curflags () const
459	{
460	return 0x80	546	return 0x80
461	| 0x02
462	#if PROTOCOL_MAJOR != 2
463	#error hi
464	#endif
465	| (ENABLE_COMPRESSION ? 0x01 : 0x00);	547	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
466	}	548	}
467		549
468	void setup (ptype type, int dst)	550	void setup (ptype type, int dst);
469	{	551	bool chk_config () const;
		552	};
		553
		554	void config_packet::setup (ptype type, int dst)
		555	{
470	prot_major = PROTOCOL_MAJOR;	556	prot_major = PROTOCOL_MAJOR;
471	prot_minor = PROTOCOL_MINOR;	557	prot_minor = PROTOCOL_MINOR;
472	randsize = RAND_SIZE;	558	randsize = RAND_SIZE;
473	hmaclen = HMACLENGTH;	559	hmaclen = HMACLENGTH;
474	flags = curflags ();	560	flags = curflags ();
475	challengelen = sizeof (rsachallenge);	561	challengelen = sizeof (rsachallenge);
476		562
477	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	563	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
478	digest_nid = htonl (EVP_MD_type (DIGEST));	564	digest_nid = htonl (EVP_MD_type (RSA_HASH));
		565	hmac_nid = htonl (EVP_MD_type (DIGEST));
479		566
480	len = sizeof (*this) - sizeof (net_packet);	567	len = sizeof (*this) - sizeof (net_packet);
481	set_hdr (type, dst);	568	set_hdr (type, dst);
482	}	569	}
483		570
484	bool chk_config ()	571	bool config_packet::chk_config () const
485	{	572	{
486	return prot_major == PROTOCOL_MAJOR	573	return prot_major == PROTOCOL_MAJOR
487	&& randsize == RAND_SIZE	574	&& randsize == RAND_SIZE
488	&& hmaclen == HMACLENGTH	575	&& hmaclen == HMACLENGTH
489	&& flags == curflags ()	576	&& flags == curflags ()
490	&& challengelen == sizeof (rsachallenge)	577	&& challengelen == sizeof (rsachallenge)
491	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	578	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))
		579	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))
492	&& digest_nid == htonl (EVP_MD_type (DIGEST));	580	&& hmac_nid == htonl (EVP_MD_type (DIGEST));
493	}	581	}
494	};
495		582
496	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_)
497	{	592	{
498	char magic[8];
499	u8 subtype;
500	u8 pad1, pad2;
501	rsaencrdata challenge;
502
503	auth_packet (int dst, auth_subtype stype)
504	{
505	config_packet::setup (PT_AUTH, dst);	593	config_packet::setup (PT_AUTH_REQ, dst);
506	subtype = stype;	594	strncpy (magic, MAGIC, 8);
		595	initiate = !!initiate_;
		596	can_recv = can_recv_;
		597
507	len = sizeof (*this) - sizeof (net_packet);	598	len = sizeof (*this) - sizeof (net_packet);
508	strncpy (magic, MAGIC, 8);
509	}
510	};	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	};
511		616
512	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_)
513	{	623	{
514	u8 id;	624	id = id_;
515	u8 pad1, pad2, pad3;
516
517	connect_req_packet (int dst, int id)
518	{
519	this->id = id;
520	set_hdr (PT_CONNECT_REQ, dst);	625	set_hdr (PT_CONNECT_REQ, dst);
521	len = sizeof (*this) - sizeof (net_packet);	626	len = sizeof (*this) - sizeof (net_packet);
522	}
523	};	627	}
		628	};
524		629
525	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_)
526	{	637	{
527	u8 id;	638	id = id_;
528	u8 pad1, pad2, pad3;	639	can_recv = can_recv_;
529	sockinfo si;	640	si = si_;
530
531	connect_info_packet (int dst, int id, sockinfo &si)
532	{
533	this->id = id;
534	this->si = si;
535	set_hdr (PT_CONNECT_INFO, dst);	641	set_hdr (PT_CONNECT_INFO, dst);
		642
536	len = sizeof (*this) - sizeof (net_packet);	643	len = sizeof (*this) - sizeof (net_packet);
537	}
538	};	644	}
		645	};
539		646
540	/////////////////////////////////////////////////////////////////////////////	647	/////////////////////////////////////////////////////////////////////////////
541		648
542	void	649	void
543	fill_sa (SOCKADDR *sa, conf_node *conf)
544	{
545	sa->sin_family = AF_INET;
546	sa->sin_port = htons (conf->port);
547	sa->sin_addr.s_addr = 0;
548
549	if (conf->hostname)
550	{
551	struct hostent *he = gethostbyname (conf->hostname);
552
553	if (he
554	&& he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0])
555	{
556	//sa->sin_family = he->h_addrtype;
557	memcpy (&sa->sin_addr, he->h_addr_list[0], 4);
558	}
559	else
560	slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname);
561	}
562	}
563
564	void
565	connection::reset_dstaddr ()	650	connection::reset_dstaddr ()
566	{	651	{
567	fill_sa (&sa, conf);	652	si.set (conf);
568	}	653	}
569		654
570	void	655	void
571	connection::send_ping (SOCKADDR *dsa, u8 pong)	656	connection::send_ping (const sockinfo &si, u8 pong)
572	{	657	{
573	ping_packet *pkt = new ping_packet;	658	ping_packet *pkt = new ping_packet;
574		659
575	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);
576	vpn->send_vpn_packet (pkt, dsa, IPTOS_LOWDELAY);	661	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
577		662
578	delete pkt;	663	delete pkt;
579	}	664	}
580		665
581	void	666	void
582	connection::send_reset (SOCKADDR *dsa)	667	connection::send_reset (const sockinfo &si)
583	{	668	{
584	static net_rate_limiter limiter(1);	669	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
585
586	if (limiter.can (dsa))
587	{	670	{
588	config_packet *pkt = new config_packet;	671	config_packet *pkt = new config_packet;
589		672
590	pkt->setup (vpn_packet::PT_RESET, conf->id);	673	pkt->setup (vpn_packet::PT_RESET, conf->id);
591	vpn->send_vpn_packet (pkt, dsa, IPTOS_MINCOST);	674	send_vpn_packet (pkt, si, IPTOS_MINCOST);
592		675
593	delete pkt;	676	delete pkt;
594	}	677	}
595	}	678	}
596		679
597	static rsachallenge *
598	gen_challenge (SOCKADDR *sa)
599	{
600	static rsachallenge k;
601
602	memcpy (&k, &challenge_bytes (), sizeof (k));
603	RAND_bytes ((unsigned char *)&k[CHG_SEQNO], sizeof (u32));
604	xor_sa (k, sa);
605
606	return &k;
607	}
608
609	void	680	void
610	connection::send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k)	681	connection::send_auth_request (const sockinfo &si, bool initiate)
611	{	682	{
612	static net_rate_limiter limiter(2);	683	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->can_recv);
613		684
614	if (subtype != AUTH_INIT || limiter.can (sa))	685	// the next line is very conservative
615	{	686	prot_send = best_protocol (THISNODE->can_send & THISNODE->can_recv & conf->can_recv);
616	auth_packet *pkt = new auth_packet (conf->id, subtype);
617		687
618	if (!k)	688	rsachallenge chg;
619	k = gen_challenge (sa);
620		689
		690	rsa_cache.gen (pkt->id, chg);
		691
621	if (0 > RSA_public_encrypt (sizeof (*k),	692	if (0 > RSA_public_encrypt (sizeof chg,
622	(unsigned char *)k, (unsigned char *)&pkt->challenge,	693	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
623	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	694	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
624	fatal ("RSA_public_encrypt error");	695	fatal ("RSA_public_encrypt error");
625		696
626	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);
627		698
628	vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY);	699	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
629		700
630	delete pkt;	701	delete pkt;
631	}	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;
632	}	720	}
633		721
634	void	722	void
635	connection::establish_connection_cb (tstamp &ts)	723	connection::establish_connection_cb (tstamp &ts)
636	{	724	{
637	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)
638	ts = TSTAMP_CANCEL;	728	ts = TSTAMP_CANCEL;
639	else if (ts <= NOW)	729	else if (ts <= NOW)
640	{	730	{
641	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;
642		732
643	if (retry_int < 3600 * 8)	733	if (retry_int < 3600 * 8)
644	retry_cnt++;	734	retry_cnt++;
645		735
646	if (connectmode == conf_node::C_ONDEMAND
647	&& retry_int > ::conf.keepalive)
648	retry_int = ::conf.keepalive;
649
650	ts = NOW + retry_int;	736	ts = NOW + retry_int;
651		737
652	if (conf->hostname)	738	if (conf->hostname)
653	{	739	{
654	reset_dstaddr ();	740	reset_dstaddr ();
655	if (sa.sin_addr.s_addr)	741	if (si.host && auth_rate_limiter.can (si))
		742	{
656	if (retry_cnt < 4)	743	if (retry_cnt < 4)
657	send_auth (AUTH_INIT, &sa);	744	send_auth_request (si, true);
658	else	745	else
659	send_ping (&sa, 0);	746	send_ping (si, 0);
		747	}
660	}	748	}
661	else	749	else
662	vpn->connect_request (conf->id);	750	vpn->connect_request (conf->id);
663	}	751	}
664	}	752	}
…		…
666	void	754	void
667	connection::reset_connection ()	755	connection::reset_connection ()
668	{	756	{
669	if (ictx && octx)	757	if (ictx && octx)
670	{	758	{
671	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);
672		761
673	if (::conf.script_node_down)	762	if (::conf.script_node_down)
674	run_script (this, &connection::script_node_down, false);	763	run_script (run_script_cb (this, &connection::script_node_down), false);
675	}	764	}
676		765
677	delete ictx;	766	delete ictx; ictx = 0;
678	ictx = 0;	767	delete octx; octx = 0;
679		768
680	delete octx;	769	si.host= 0;
681	octx = 0;
682
683	sa.sin_port = 0;
684	sa.sin_addr.s_addr = 0;
685		770
686	last_activity = 0;	771	last_activity = 0;
		772	retry_cnt = 0;
687		773
688	rekey.reset ();	774	rekey.reset ();
689	keepalive.reset ();	775	keepalive.reset ();
690	establish_connection.reset ();	776	establish_connection.reset ();
691	}	777	}
692		778
693	void	779	void
694	connection::shutdown ()	780	connection::shutdown ()
695	{	781	{
696	if (ictx && octx)	782	if (ictx && octx)
697	send_reset (&sa);	783	send_reset (si);
698		784
699	reset_connection ();	785	reset_connection ();
700	}	786	}
701		787
702	void	788	void
…		…
707	reset_connection ();	793	reset_connection ();
708	establish_connection ();	794	establish_connection ();
709	}	795	}
710		796
711	void	797	void
712	connection::send_data_packet (tap_packet * pkt, bool broadcast)	798	connection::send_data_packet (tap_packet *pkt, bool broadcast)
713	{	799	{
714	vpndata_packet *p = new vpndata_packet;	800	vpndata_packet *p = new vpndata_packet;
715	int tos = 0;	801	int tos = 0;
716		802
717	if (conf->inherit_tos	803	if (conf->inherit_tos
718	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	804	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
719	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4	805	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
720	tos = (*pkt)[15] & IPTOS_TOS_MASK;	806	tos = (*pkt)[15] & IPTOS_TOS_MASK;
721		807
722	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
723	vpn->send_vpn_packet (p, &sa, tos);	809	send_vpn_packet (p, si, tos);
724		810
725	delete p;	811	delete p;
726		812
727	if (oseqno > MAX_SEQNO)	813	if (oseqno > MAX_SEQNO)
728	rekey ();	814	rekey ();
…		…
741	establish_connection ();	827	establish_connection ();
742	}	828	}
743	}	829	}
744		830
745	void	831	void
746	connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa)	832	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
747	{	833	{
748	last_activity = NOW;	834	last_activity = NOW;
749		835
750	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",
751	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	837	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
752		838
753	switch (pkt->typ ())	839	switch (pkt->typ ())
754	{	840	{
755	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 && !octx)
		846	{
		847	if (auth_rate_limiter.can (rsi))
		848	send_auth_request (rsi, true);
		849	}
		850	else
756	send_ping (ssa, 1); // pong	851	send_ping (rsi, 1); // pong
		852
757	break;	853	break;
758		854
759	case vpn_packet::PT_PONG:	855	case vpn_packet::PT_PONG:
760	// we send pings instead of auth packets after some retries,
761	// so reset the retry counter and establish a conenction
762	// when we receive a pong.
763	if (!ictx && !octx)
764	{
765	retry_cnt = 0;
766	establish_connection.at = 0;
767	establish_connection ();
768	}
769
770	break;	856	break;
771		857
772	case vpn_packet::PT_RESET:	858	case vpn_packet::PT_RESET:
773	{	859	{
774	reset_connection ();	860	reset_connection ();
775		861
776	config_packet *p = (config_packet *) pkt;	862	config_packet *p = (config_packet *) pkt;
		863
777	if (!p->chk_config ())	864	if (!p->chk_config ())
778	{	865	{
779	slog (L_WARN, _("disabling node '%s' because of differing protocol"), conf->nodename);	866	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		867	conf->nodename, (const char *)rsi);
780	connectmode = conf_node::C_NEVER;	868	connectmode = conf_node::C_DISABLED;
781	}	869	}
782	else if (connectmode == conf_node::C_ALWAYS)	870	else if (connectmode == conf_node::C_ALWAYS)
783	establish_connection ();	871	establish_connection ();
784	}	872	}
785	break;	873	break;
786		874
787	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:
788	{	927	{
789	auth_packet *p = (auth_packet *) pkt;	928	auth_res_packet *p = (auth_res_packet *) pkt;
790		929
791	slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype);	930	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
792		931
793	if (p->chk_config ()	932	if (p->chk_config ())
794	&& !strncmp (p->magic, MAGIC, 8))
795	{	933	{
796	if (p->prot_minor != PROTOCOL_MINOR)	934	if (p->prot_minor != PROTOCOL_MINOR)
797	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,
798	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	937	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
799		938
800	if (p->subtype == AUTH_INIT)
801	send_auth (AUTH_INITREPLY, ssa);
802
803	rsachallenge k;	939	rsachallenge chg;
804		940
805	if (0 > RSA_private_decrypt (sizeof (rsaencrdata),	941	if (!rsa_cache.find (p->id, chg))
806	(unsigned char *)&p->challenge, (unsigned char *)&k,	942	slog (L_ERR, _("%s(%s): unrequested auth response"),
807	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	943	conf->nodename, (const char *)rsi);
		944	else
808	{	945	{
809	slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"),	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"),
810	conf->nodename, (const char *)sockinfo (ssa));	951	conf->nodename, (const char *)rsi);
811	break;	952	else
812	}
813
814	retry_cnt = 0;
815	establish_connection.set (NOW + 8); //? ;)
816	keepalive.reset ();
817	rekey.reset ();
818
819	switch (p->subtype)
820	{
821	case AUTH_INIT:
822	case AUTH_INITREPLY:
823	delete ictx;
824	ictx = 0;
825
826	delete octx;
827
828	octx = new crypto_ctx (k, 1);
829	oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff;
830
831	send_auth (AUTH_REPLY, ssa, &k);
832	break;
833
834	case AUTH_REPLY:
835
836	if (!memcmp ((u8 *)gen_challenge (ssa) + sizeof (u32), (u8 *)&k + sizeof (u32),
837	sizeof (rsachallenge) - sizeof (u32)))
838	{	953	{
839	delete ictx;
840
841	ictx = new crypto_ctx (k, 0);
842	iseqno.reset (*(u32 *)&k[CHG_SEQNO] & 0x7fffffff); // at least 2**31 sequence numbers are valid
843
844	sa = *ssa;	954	rsaresponse h;
845		955
846	rekey.set (NOW + ::conf.rekey);	956	rsa_hash (p->id, chg, h);
847	keepalive.set (NOW + ::conf.keepalive);
848		957
849	// send queued packets	958	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
850	while (tap_packet *p = queue.get ())
851	{	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	{
852	send_data_packet (p);	974	send_data_packet (p);
853	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;
854	}	988	}
855		989	else
856	connectmode = conf->connectmode;	990	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
857
858	slog (L_INFO, _("connection to %d (%s %s) established"),
859	conf->id, conf->nodename, (const char *)sockinfo (ssa));	991	conf->nodename, (const char *)rsi);
860
861	if (::conf.script_node_up)
862	run_script (this, &connection::script_node_up, false);
863	}	992	}
		993
864	else	994	delete cctx;
865	slog (L_ERR, _("sent and received challenge do not match with (%s %s))"),
866	conf->nodename, (const char *)sockinfo (ssa));
867
868	break;
869	default:
870	slog (L_ERR, _("authentification illegal subtype error (%s %s)"),
871	conf->nodename, (const char *)sockinfo (ssa));
872	break;
873	}	995	}
874	}	996	}
875	else
876	send_reset (ssa);
877
878	break;
879	}	997	}
		998
		999	send_reset (rsi);
		1000	break;
880		1001
881	case vpn_packet::PT_DATA_COMPRESSED:	1002	case vpn_packet::PT_DATA_COMPRESSED:
882	#if !ENABLE_COMPRESSION	1003	#if !ENABLE_COMPRESSION
883	send_reset (ssa);	1004	send_reset (rsi);
884	break;	1005	break;
885	#endif	1006	#endif
		1007
886	case vpn_packet::PT_DATA_UNCOMPRESSED:	1008	case vpn_packet::PT_DATA_UNCOMPRESSED:
887		1009
888	if (ictx && octx)	1010	if (ictx && octx)
889	{	1011	{
890	vpndata_packet *p = (vpndata_packet *)pkt;	1012	vpndata_packet *p = (vpndata_packet *)pkt;
891		1013
892	if (*ssa == sa)	1014	if (rsi == si)
893	{	1015	{
894	if (!p->hmac_chk (ictx))	1016	if (!p->hmac_chk (ictx))
895	slog (L_ERR, _("hmac authentication error, received invalid packet\n"	1017	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
896	"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);
897	else	1020	else
898	{	1021	{
899	u32 seqno;	1022	u32 seqno;
900	tap_packet *d = p->unpack (this, seqno);	1023	tap_packet *d = p->unpack (this, seqno);
901		1024
…		…
917	break;	1040	break;
918	}	1041	}
919	}	1042	}
920	}	1043	}
921	else	1044	else
922	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);
923	}	1046	}
924		1047
925	send_reset (ssa);	1048	send_reset (rsi);
926	break;	1049	break;
927		1050
928	case vpn_packet::PT_CONNECT_REQ:	1051	case vpn_packet::PT_CONNECT_REQ:
929	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1052	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
930	{	1053	{
931	connect_req_packet *p = (connect_req_packet *) pkt;	1054	connect_req_packet *p = (connect_req_packet *) pkt;
932		1055
933	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
934		1057
…		…
940	if (c->ictx && c->octx)	1063	if (c->ictx && c->octx)
941	{	1064	{
942	// send connect_info packets to both sides, in case one is	1065	// send connect_info packets to both sides, in case one is
943	// behind a nat firewall (or both ;)	1066	// behind a nat firewall (or both ;)
944	{	1067	{
945	sockinfo si(sa);
946
947	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1068	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
948	c->conf->id, conf->id, (const char *)si);	1069	c->conf->id, conf->id, (const char *)si);
949		1070
950	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);
951		1072
952	r->hmac_set (c->octx);	1073	r->hmac_set (c->octx);
953	vpn->send_vpn_packet (r, &c->sa);	1074	send_vpn_packet (r, c->si);
954		1075
955	delete r;	1076	delete r;
956	}	1077	}
957		1078
958	{	1079	{
959	sockinfo si(c->sa);
960
961	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1080	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
962	conf->id, c->conf->id, (const char *)si);	1081	conf->id, c->conf->id, (const char *)c->si);
963		1082
964	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);
965		1084
966	r->hmac_set (octx);	1085	r->hmac_set (octx);
967	vpn->send_vpn_packet (r, &sa);	1086	send_vpn_packet (r, si);
968		1087
969	delete r;	1088	delete r;
970	}	1089	}
971	}	1090	}
972	}	1091	}
973		1092
974	break;	1093	break;
975		1094
976	case vpn_packet::PT_CONNECT_INFO:	1095	case vpn_packet::PT_CONNECT_INFO:
977	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1096	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
978	{	1097	{
979	connect_info_packet *p = (connect_info_packet *) pkt;	1098	connect_info_packet *p = (connect_info_packet *) pkt;
980		1099
981	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
982		1101
983	connection *c = vpn->conns[p->id - 1];	1102	connection *c = vpn->conns[p->id - 1];
984		1103
985	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1104	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
986	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);
987		1106
988	c->send_auth (AUTH_INIT, p->si.sa ());	1107	c->conf->can_recv = p->can_recv;
		1108	c->send_auth_request (p->si, true);
989	}	1109	}
		1110
990	break;	1111	break;
991		1112
992	default:	1113	default:
993	send_reset (ssa);	1114	send_reset (rsi);
994	break;	1115	break;
		1116
995	}	1117	}
996	}	1118	}
997		1119
998	void connection::keepalive_cb (tstamp &ts)	1120	void connection::keepalive_cb (tstamp &ts)
999	{	1121	{
…		…
1005	else if (NOW < last_activity + ::conf.keepalive)	1127	else if (NOW < last_activity + ::conf.keepalive)
1006	ts = last_activity + ::conf.keepalive;	1128	ts = last_activity + ::conf.keepalive;
1007	else if (conf->connectmode != conf_node::C_ONDEMAND	1129	else if (conf->connectmode != conf_node::C_ONDEMAND
1008	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1130	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1009	{	1131	{
1010	send_ping (&sa);	1132	send_ping (si);
1011	ts = NOW + 5;	1133	ts = NOW + 5;
1012	}	1134	}
1013	else	1135	else
1014	reset_connection ();	1136	reset_connection ();
1015		1137
…		…
1019	{	1141	{
1020	connect_req_packet *p = new connect_req_packet (conf->id, id);	1142	connect_req_packet *p = new connect_req_packet (conf->id, id);
1021		1143
1022	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);	1144	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);
1023	p->hmac_set (octx);	1145	p->hmac_set (octx);
1024	vpn->send_vpn_packet (p, &sa);	1146	send_vpn_packet (p, si);
1025		1147
1026	delete p;	1148	delete p;
1027	}	1149	}
1028		1150
1029	void connection::script_node ()	1151	void connection::script_node ()
1030	{	1152	{
1031	vpn->script_if_up ();	1153	vpn->script_if_up (0);
1032		1154
1033	char *env;	1155	char *env;
1034	asprintf (&env, "DESTID=%d", conf->id);	1156	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1035	putenv (env);
1036	asprintf (&env, "DESTNODE=%s", conf->nodename);	1157	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1037	putenv (env);	1158	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1038	asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr));
1039	putenv (env);
1040	asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port));	1159	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1041	putenv (env);
1042	}	1160	}
1043		1161
1044	const char *connection::script_node_up ()	1162	const char *connection::script_node_up (int)
1045	{	1163	{
1046	script_node ();	1164	script_node ();
1047		1165
1048	putenv ("STATE=up");	1166	putenv ("STATE=up");
1049		1167
1050	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1168	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1051	}	1169	}
1052		1170
1053	const char *connection::script_node_down ()	1171	const char *connection::script_node_down (int)
1054	{	1172	{
1055	script_node ();	1173	script_node ();
1056		1174
1057	putenv ("STATE=down");	1175	putenv ("STATE=down");
1058		1176
1059	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1177	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
		1178	}
		1179
		1180	// send a vpn packet out to other hosts
		1181	void
		1182	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1183	{
		1184	if (prot_send & PROT_IPv4)
		1185	vpn->send_ipv4_packet (pkt, si, tos);
		1186	else
		1187	vpn->send_udpv4_packet (pkt, si, tos);
1060	}	1188	}
1061		1189
1062	connection::connection(struct vpn *vpn_)	1190	connection::connection(struct vpn *vpn_)
1063	: vpn(vpn_)	1191	: vpn(vpn_)
1064	, rekey (this, &connection::rekey_cb)	1192	, rekey (this, &connection::rekey_cb)
…		…
1077	shutdown ();	1205	shutdown ();
1078	}	1206	}
1079		1207
1080	/////////////////////////////////////////////////////////////////////////////	1208	/////////////////////////////////////////////////////////////////////////////
1081		1209
1082	const char *vpn::script_if_up ()	1210	const char *vpn::script_if_up (int)
1083	{	1211	{
1084	// the tunnel device mtu should be the physical mtu - overhead	1212	// the tunnel device mtu should be the physical mtu - overhead
1085	// the tricky part is rounding to the cipher key blocksize	1213	// the tricky part is rounding to the cipher key blocksize
1086	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD;	1214	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
1087	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	1215	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
1088	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	1216	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
1089	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	1217	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
1090		1218
1091	char *env;	1219	char *env;
…		…
1106		1234
1107	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	1235	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
1108	}	1236	}
1109		1237
1110	int	1238	int
1111	vpn::setup (void)	1239	vpn::setup ()
1112	{	1240	{
1113	struct sockaddr_in sa;	1241	u8 prots = 0;
1114		1242
		1243	for (configuration::node_vector::iterator i = conf.nodes.begin ();
		1244	i != conf.nodes.end (); ++i)
		1245	prots |= (*i)->can_send | (*i)->can_recv;
		1246
		1247	sockinfo si;
		1248
		1249	si.set (THISNODE);
		1250
		1251	udpv4_fd = -1;
		1252
		1253	if (prots & PROT_UDPv4)
		1254	{
1115	socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	1255	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
1116	if (socket_fd < 0)	1256
		1257	if (udpv4_fd < 0)
1117	return -1;	1258	return -1;
1118		1259
1119	fill_sa (&sa, THISNODE);	1260	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
1120		1261	{
1121	if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa)))
1122	{
1123	slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno));	1262	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
1124	exit (1);	1263	exit (1);
1125	}	1264	}
1126		1265
1127	#ifdef IP_MTU_DISCOVER	1266	#ifdef IP_MTU_DISCOVER
1128	// this I really consider a linux bug. I am neither connected	1267	// this I really consider a linux bug. I am neither connected
1129	// nor do I fragment myself. Linux still sets DF and doesn't	1268	// nor do I fragment myself. Linux still sets DF and doesn't
1130	// fragment for me sometimes.	1269	// fragment for me sometimes.
1131	{	1270	{
1132	int oval = IP_PMTUDISC_DONT;	1271	int oval = IP_PMTUDISC_DONT;
1133	setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	1272	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
1134	}	1273	}
1135	#endif	1274	#endif
1136	{	1275
		1276	// standard daemon practise...
		1277	{
1137	int oval = 1;	1278	int oval = 1;
1138	setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	1279	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
1139	}	1280	}
1140		1281
1141	udp_ev_watcher.start (socket_fd, POLLIN);	1282	udpv4_ev_watcher.start (udpv4_fd, POLLIN);
		1283	}
		1284
		1285	ipv4_fd = -1;
		1286	if (prots & PROT_IPv4)
		1287	{
		1288	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		1289
		1290	if (ipv4_fd < 0)
		1291	return -1;
		1292
		1293	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		1294	{
		1295	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
		1296	exit (1);
		1297	}
		1298
		1299	#ifdef IP_MTU_DISCOVER
		1300	// this I really consider a linux bug. I am neither connected
		1301	// nor do I fragment myself. Linux still sets DF and doesn't
		1302	// fragment for me sometimes.
		1303	{
		1304	int oval = IP_PMTUDISC_DONT;
		1305	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		1306	}
		1307	#endif
		1308
		1309	ipv4_ev_watcher.start (ipv4_fd, POLLIN);
		1310	}
1142		1311
1143	tap = new tap_device ();	1312	tap = new tap_device ();
1144	if (!tap) //D this, of course, never catches	1313	if (!tap) //D this, of course, never catches
1145	{	1314	{
1146	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	1315	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
1147	exit (1);	1316	exit (1);
1148	}	1317	}
1149		1318
1150	run_script (this, &vpn::script_if_up, true);	1319	run_script (run_script_cb (this, &vpn::script_if_up), true);
1151		1320
1152	vpn_ev_watcher.start (tap->fd, POLLIN);	1321	tap_ev_watcher.start (tap->fd, POLLIN);
1153		1322
1154	reconnect_all ();	1323	reconnect_all ();
1155		1324
1156	return 0;	1325	return 0;
1157	}	1326	}
1158		1327
1159	void	1328	void
1160	vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos)	1329	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1161	{	1330	{
1162	setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	1331	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
1163	sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa));	1332	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
1164	}	1333	}
1165		1334
1166	void	1335	void
1167	vpn::shutdown_all ()	1336	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1168	{	1337	{
1169	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1338	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
1170	(*c)->shutdown ();	1339	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
1171	}	1340	}
1172		1341
1173	void	1342	void
1174	vpn::reconnect_all ()	1343	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
1175	{	1344	{
1176	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1345	unsigned int src = pkt->src ();
1177	delete *c;	1346	unsigned int dst = pkt->dst ();
1178		1347
1179	conns.clear ();	1348	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
		1349	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
1180		1350
1181	for (configuration::node_vector::iterator i = conf.nodes.begin ();	1351	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
1182	i != conf.nodes.end (); ++i)	1352	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
1183	{	1353	pkt->typ (), pkt->src (), pkt->dst ());
1184	connection *conn = new connection (this);	1354	else if (dst == 0 && !THISNODE->routerprio)
1185		1355	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
1186	conn->conf = *i;	1356	else if (dst != 0 && dst != THISNODE->id)
1187	conns.push_back (conn);	1357	slog (L_WARN,
1188		1358	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
1189	conn->establish_connection ();	1359	dst, conns[dst - 1]->conf->nodename,
1190	}	1360	(const char *)rsi,
		1361	THISNODE->id, THISNODE->nodename);
		1362	else if (src == 0 || src > conns.size ())
		1363	slog (L_WARN, _("received frame from unknown node %d (%s)"),
		1364	src, (const char *)rsi);
		1365	else
		1366	conns[src - 1]->recv_vpn_packet (pkt, rsi);
1191	}	1367	}
1192		1368
1193	connection *vpn::find_router ()
1194	{
1195	u32 prio = 0;
1196	connection *router = 0;
1197
1198	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
1199	{
1200	connection *c = *i;
1201
1202	if (c->conf->routerprio > prio
1203	&& c->connectmode == conf_node::C_ALWAYS
1204	&& c->conf != THISNODE
1205	&& c->ictx && c->octx)
1206	{
1207	prio = c->conf->routerprio;
1208	router = c;
1209	}
1210	}
1211
1212	return router;
1213	}
1214
1215	void vpn::connect_request (int id)
1216	{
1217	connection *c = find_router ();
1218
1219	if (c)
1220	c->connect_request (id);
1221	//else // does not work, because all others must connect to the same router
1222	// // no router found, aggressively connect to all routers
1223	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
1224	// if ((*i)->conf->routerprio)
1225	// (*i)->establish_connection ();
1226	}
1227
1228	void	1369	void
1229	vpn::udp_ev (short revents)	1370	vpn::udpv4_ev (short revents)
1230	{	1371	{
1231	if (revents & (POLLIN | POLLERR))	1372	if (revents & (POLLIN | POLLERR))
1232	{	1373	{
1233	vpn_packet *pkt = new vpn_packet;	1374	vpn_packet *pkt = new vpn_packet;
1234	struct sockaddr_in sa;	1375	struct sockaddr_in sa;
1235	socklen_t sa_len = sizeof (sa);	1376	socklen_t sa_len = sizeof (sa);
1236	int len;	1377	int len;
1237		1378
1238	len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);	1379	len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1380
		1381	sockinfo si(sa);
1239		1382
1240	if (len > 0)	1383	if (len > 0)
1241	{	1384	{
1242	pkt->len = len;	1385	pkt->len = len;
1243		1386
1244	unsigned int src = pkt->src ();
1245	unsigned int dst = pkt->dst ();
1246
1247	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
1248	(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
1249
1250	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
1251	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
1252	pkt->typ (), pkt->src (), pkt->dst ());
1253	else if (dst == 0 && !THISNODE->routerprio)
1254	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
1255	else if (dst != 0 && dst != THISNODE->id)
1256	slog (L_WARN,
1257	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
1258	dst, conns[dst - 1]->conf->nodename,
1259	(const char *)sockinfo (sa),
1260	THISNODE->id, THISNODE->nodename);
1261	else if (src == 0 || src > conns.size ())
1262	slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa));
1263	else
1264	conns[src - 1]->recv_vpn_packet (pkt, &sa);	1387	recv_vpn_packet (pkt, si);
1265	}	1388	}
1266	else	1389	else
1267	{	1390	{
1268	// probably ECONNRESET or somesuch	1391	// probably ECONNRESET or somesuch
1269	slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno));	1392	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
1270	}	1393	}
1271		1394
1272	delete pkt;	1395	delete pkt;
1273	}	1396	}
1274	else if (revents & POLLHUP)	1397	else if (revents & POLLHUP)
1275	{	1398	{
1276	// this cannot ;) happen on udp sockets	1399	// this cannot ;) happen on udp sockets
1277	slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating."));	1400	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
1278	exit (1);	1401	exit (1);
1279	}	1402	}
1280	else	1403	else
1281	{	1404	{
1282	slog (L_ERR,	1405	slog (L_ERR,
…		…
1285	exit (1);	1408	exit (1);
1286	}	1409	}
1287	}	1410	}
1288		1411
1289	void	1412	void
		1413	vpn::ipv4_ev (short revents)
		1414	{
		1415	if (revents & (POLLIN | POLLERR))
		1416	{
		1417	vpn_packet *pkt = new vpn_packet;
		1418	struct sockaddr_in sa;
		1419	socklen_t sa_len = sizeof (sa);
		1420	int len;
		1421
		1422	len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1423
		1424	sockinfo si(sa, PROT_IPv4);
		1425
		1426	if (len > 0)
		1427	{
		1428	pkt->len = len;
		1429
		1430	// raw sockets deliver the ipv4, but don't expect it on sends
		1431	// this is slow, but...
		1432	pkt->skip_hdr (IP_OVERHEAD);
		1433
		1434	recv_vpn_packet (pkt, si);
		1435	}
		1436	else
		1437	{
		1438	// probably ECONNRESET or somesuch
		1439	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1440	}
		1441
		1442	delete pkt;
		1443	}
		1444	else if (revents & POLLHUP)
		1445	{
		1446	// this cannot ;) happen on udp sockets
		1447	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
		1448	exit (1);
		1449	}
		1450	else
		1451	{
		1452	slog (L_ERR,
		1453	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1454	revents);
		1455	exit (1);
		1456	}
		1457	}
		1458
		1459	void
1290	vpn::vpn_ev (short revents)	1460	vpn::tap_ev (short revents)
1291	{	1461	{
1292	if (revents & POLLIN)	1462	if (revents & POLLIN)
1293	{	1463	{
1294	/* process data */	1464	/* process data */
1295	tap_packet *pkt;	1465	tap_packet *pkt;
…		…
1351	{	1521	{
1352	if (events)	1522	if (events)
1353	{	1523	{
1354	if (events & EVENT_SHUTDOWN)	1524	if (events & EVENT_SHUTDOWN)
1355	{	1525	{
		1526	slog (L_INFO, _("preparing shutdown..."));
		1527
1356	shutdown_all ();	1528	shutdown_all ();
1357		1529
1358	remove_pid (pidfilename);	1530	remove_pid (pidfilename);
1359		1531
1360	slog (L_INFO, _("vped terminating"));	1532	slog (L_INFO, _("terminating"));
1361		1533
1362	exit (0);	1534	exit (0);
1363	}	1535	}
1364		1536
1365	if (events & EVENT_RECONNECT)	1537	if (events & EVENT_RECONNECT)
		1538	{
		1539	slog (L_INFO, _("forced reconnect"));
		1540
1366	reconnect_all ();	1541	reconnect_all ();
		1542	}
1367		1543
1368	events = 0;	1544	events = 0;
1369	}	1545	}
1370		1546
1371	ts = TSTAMP_CANCEL;	1547	ts = TSTAMP_CANCEL;
1372	}	1548	}
1373		1549
		1550	void
		1551	vpn::shutdown_all ()
		1552	{
		1553	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1554	(*c)->shutdown ();
		1555	}
		1556
		1557	void
		1558	vpn::reconnect_all ()
		1559	{
		1560	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1561	delete *c;
		1562
		1563	conns.clear ();
		1564
		1565	auth_rate_limiter.clear ();
		1566	reset_rate_limiter.clear ();
		1567
		1568	for (configuration::node_vector::iterator i = conf.nodes.begin ();
		1569	i != conf.nodes.end (); ++i)
		1570	{
		1571	connection *conn = new connection (this);
		1572
		1573	conn->conf = *i;
		1574	conns.push_back (conn);
		1575
		1576	conn->establish_connection ();
		1577	}
		1578	}
		1579
		1580	connection *vpn::find_router ()
		1581	{
		1582	u32 prio = 0;
		1583	connection *router = 0;
		1584
		1585	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		1586	{
		1587	connection *c = *i;
		1588
		1589	if (c->conf->routerprio > prio
		1590	&& c->connectmode == conf_node::C_ALWAYS
		1591	&& c->conf != THISNODE
		1592	&& c->ictx && c->octx)
		1593	{
		1594	prio = c->conf->routerprio;
		1595	router = c;
		1596	}
		1597	}
		1598
		1599	return router;
		1600	}
		1601
		1602	void vpn::connect_request (int id)
		1603	{
		1604	connection *c = find_router ();
		1605
		1606	if (c)
		1607	c->connect_request (id);
		1608	//else // does not work, because all others must connect to the same router
		1609	// // no router found, aggressively connect to all routers
		1610	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		1611	// if ((*i)->conf->routerprio)
		1612	// (*i)->establish_connection ();
		1613	}
		1614
		1615	void
		1616	connection::dump_status ()
		1617	{
		1618	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
		1619	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
		1620	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
		1621	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
		1622	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
		1623	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
		1624	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
		1625	}
		1626
		1627	void
		1628	vpn::dump_status ()
		1629	{
		1630	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
		1631
		1632	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1633	(*c)->dump_status ();
		1634
		1635	slog (L_NOTICE, _("END status dump"));
		1636	}
		1637
1374	vpn::vpn (void)	1638	vpn::vpn (void)
1375	: udp_ev_watcher (this, &vpn::udp_ev)	1639	: udpv4_ev_watcher(this, &vpn::udpv4_ev)
		1640	, ipv4_ev_watcher(this, &vpn::ipv4_ev)
1376	, vpn_ev_watcher (this, &vpn::vpn_ev)	1641	, tap_ev_watcher(this, &vpn::tap_ev)
1377	, event (this, &vpn::event_cb)	1642	, event(this, &vpn::event_cb)
1378	{	1643	{
1379	}	1644	}
1380		1645
1381	vpn::~vpn ()	1646	vpn::~vpn ()
1382	{	1647	{

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