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Comparing gvpe/src/protocol.C (file contents):
Revision 1.3 by pcg, Mon Mar 3 06:03:40 2003 UTC vs.
Revision 1.25 by pcg, Fri Mar 28 16:21:09 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 &
62	challenge_bytes ()
63	{
64	static rsachallenge challenge;
65	static time_t challenge_ttl; // time this challenge needs to be recreated
66
67	if (now > challenge_ttl)
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	}
111
112	struct crypto_ctx	63	struct crypto_ctx
113	{	64	{
114	EVP_CIPHER_CTX cctx;	65	EVP_CIPHER_CTX cctx;
115	HMAC_CTX hctx;	66	HMAC_CTX hctx;
116		67
117	crypto_ctx (rsachallenge &challenge, int enc);	68	crypto_ctx (const rsachallenge &challenge, int enc);
118	~crypto_ctx ();	69	~crypto_ctx ();
119	};	70	};
120		71
121	crypto_ctx::crypto_ctx (rsachallenge &challenge, int enc)	72	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
122	{	73	{
123	EVP_CIPHER_CTX_init (&cctx);	74	EVP_CIPHER_CTX_init (&cctx);
124	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	75	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);
125	HMAC_CTX_init (&hctx);	76	HMAC_CTX_init (&hctx);
126	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	77	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
…		…
130	{	81	{
131	EVP_CIPHER_CTX_cleanup (&cctx);	82	EVP_CIPHER_CTX_cleanup (&cctx);
132	HMAC_CTX_cleanup (&hctx);	83	HMAC_CTX_cleanup (&hctx);
133	}	84	}
134		85
		86	static void
		87	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
		88	{
		89	EVP_MD_CTX ctx;
		90
		91	EVP_MD_CTX_init (&ctx);
		92	EVP_DigestInit (&ctx, RSA_HASH);
		93	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
		94	EVP_DigestUpdate(&ctx, &id, sizeof id);
		95	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
		96	EVP_MD_CTX_cleanup (&ctx);
		97	}
		98
		99	struct rsa_entry {
		100	tstamp expire;
		101	rsaid id;
		102	rsachallenge chg;
		103	};
		104
		105	struct rsa_cache : list<rsa_entry>
		106	{
		107	void cleaner_cb (tstamp &ts); time_watcher cleaner;
		108
		109	bool find (const rsaid &id, rsachallenge &chg)
		110	{
		111	for (iterator i = begin (); i != end (); ++i)
		112	{
		113	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
		114	{
		115	memcpy (&chg, &i->chg, sizeof chg);
		116
		117	erase (i);
		118	return true;
		119	}
		120	}
		121
		122	if (cleaner.at < NOW)
		123	cleaner.start (NOW + RSA_TTL);
		124
		125	return false;
		126	}
		127
		128	void gen (rsaid &id, rsachallenge &chg)
		129	{
		130	rsa_entry e;
		131
		132	RAND_bytes ((unsigned char *)&id, sizeof id);
		133	RAND_bytes ((unsigned char *)&chg, sizeof chg);
		134
		135	e.expire = NOW + RSA_TTL;
		136	e.id = id;
		137	memcpy (&e.chg, &chg, sizeof chg);
		138
		139	push_back (e);
		140
		141	if (cleaner.at < NOW)
		142	cleaner.start (NOW + RSA_TTL);
		143	}
		144
		145	rsa_cache ()
		146	: cleaner (this, &rsa_cache::cleaner_cb)
		147	{ }
		148
		149	} rsa_cache;
		150
		151	void rsa_cache::cleaner_cb (tstamp &ts)
		152	{
		153	if (empty ())
		154	ts = TSTAMP_CANCEL;
		155	else
		156	{
		157	ts = NOW + RSA_TTL;
		158
		159	for (iterator i = begin (); i != end (); )
		160	if (i->expire <= NOW)
		161	i = erase (i);
		162	else
		163	++i;
		164	}
		165	}
		166
		167	typedef callback<const char *, int> run_script_cb;
		168
		169	// run a shell script (or actually an external program).
		170	static void
		171	run_script (const run_script_cb &cb, bool wait)
		172	{
		173	int pid;
		174
		175	if ((pid = fork ()) == 0)
		176	{
		177	char *filename;
		178	asprintf (&filename, "%s/%s", confbase, cb(0));
		179	execl (filename, filename, (char *) 0);
		180	exit (255);
		181	}
		182	else if (pid > 0)
		183	{
		184	if (wait)
		185	{
		186	waitpid (pid, 0, 0);
		187	/* TODO: check status */
		188	}
		189	}
		190	}
		191
		192	//////////////////////////////////////////////////////////////////////////////
		193
		194	void pkt_queue::put (tap_packet *p)
		195	{
		196	if (queue[i])
		197	{
		198	delete queue[i];
		199	j = (j + 1) % QUEUEDEPTH;
		200	}
		201
		202	queue[i] = p;
		203
		204	i = (i + 1) % QUEUEDEPTH;
		205	}
		206
		207	tap_packet *pkt_queue::get ()
		208	{
		209	tap_packet *p = queue[j];
		210
		211	if (p)
		212	{
		213	queue[j] = 0;
		214	j = (j + 1) % QUEUEDEPTH;
		215	}
		216
		217	return p;
		218	}
		219
		220	pkt_queue::pkt_queue ()
		221	{
		222	memset (queue, 0, sizeof (queue));
		223	i = 0;
		224	j = 0;
		225	}
		226
		227	pkt_queue::~pkt_queue ()
		228	{
		229	for (i = QUEUEDEPTH; --i > 0; )
		230	delete queue[i];
		231	}
		232
		233	struct net_rateinfo {
		234	u32 host;
		235	double pcnt, diff;
		236	tstamp last;
		237	};
		238
		239	// only do action once every x seconds per host whole allowing bursts.
		240	// this implementation ("splay list" ;) is inefficient,
		241	// but low on resources.
		242	struct net_rate_limiter : list<net_rateinfo>
		243	{
		244	static const double ALPHA = 1. - 1. / 90.; // allow bursts
		245	static const double CUTOFF = 20.; // one event every CUTOFF seconds
		246	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
		247
		248	bool can (const sockinfo &si) { return can((u32)si.host); }
		249	bool can (u32 host);
		250	};
		251
		252	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
		253
		254	bool net_rate_limiter::can (u32 host)
		255	{
		256	iterator i;
		257
		258	for (i = begin (); i != end (); )
		259	if (i->host == host)
		260	break;
		261	else if (i->last < NOW - EXPIRE)
		262	i = erase (i);
		263	else
		264	i++;
		265
		266	if (i == end ())
		267	{
		268	net_rateinfo ri;
		269
		270	ri.host = host;
		271	ri.pcnt = 1.;
		272	ri.diff = CUTOFF * (1. / (1. - ALPHA));
		273	ri.last = NOW;
		274
		275	push_front (ri);
		276
		277	return true;
		278	}
		279	else
		280	{
		281	net_rateinfo ri (*i);
		282	erase (i);
		283
		284	ri.pcnt = ri.pcnt * ALPHA;
		285	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
		286
		287	ri.last = NOW;
		288
		289	bool send = ri.diff / ri.pcnt > CUTOFF;
		290
		291	if (send)
		292	ri.pcnt++;
		293
		294	push_front (ri);
		295
		296	return send;
		297	}
		298	}
		299
135	/////////////////////////////////////////////////////////////////////////////	300	/////////////////////////////////////////////////////////////////////////////
136		301
137	static void next_wakeup (time_t next)	302	static void next_wakeup (time_t next)
138	{	303	{
139	if (next_timecheck > next)	304	if (next_timecheck > next)
…		…
141	}	306	}
142		307
143	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];	308	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
144		309
145	struct hmac_packet:net_packet	310	struct hmac_packet:net_packet
		311	{
		312	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
		313
		314	void hmac_set (crypto_ctx * ctx);
		315	bool hmac_chk (crypto_ctx * ctx);
		316
		317	private:
		318	void hmac_gen (crypto_ctx * ctx)
146	{	319	{
147	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
148
149	void hmac_set (crypto_ctx * ctx);
150	bool hmac_chk (crypto_ctx * ctx);
151
152	private:
153	void hmac_gen (crypto_ctx * ctx)
154	{
155	unsigned int xlen;	320	unsigned int xlen;
156	HMAC_CTX *hctx = &ctx->hctx;	321	HMAC_CTX *hctx = &ctx->hctx;
157		322
158	HMAC_Init_ex (hctx, 0, 0, 0, 0);	323	HMAC_Init_ex (hctx, 0, 0, 0, 0);
159	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	324	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
160	len - sizeof (hmac_packet));	325	len - sizeof (hmac_packet));
161	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	326	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
162	}
163	};	327	}
		328	};
164		329
165	void	330	void
166	hmac_packet::hmac_set (crypto_ctx * ctx)	331	hmac_packet::hmac_set (crypto_ctx * ctx)
167	{	332	{
168	hmac_gen (ctx);	333	hmac_gen (ctx);
…		…
184	{	349	{
185	PT_RESET = 0,	350	PT_RESET = 0,
186	PT_DATA_UNCOMPRESSED,	351	PT_DATA_UNCOMPRESSED,
187	PT_DATA_COMPRESSED,	352	PT_DATA_COMPRESSED,
188	PT_PING, PT_PONG, // wasting namespace space? ;)	353	PT_PING, PT_PONG, // wasting namespace space? ;)
189	PT_AUTH, // authentification	354	PT_AUTH_REQ, // authentification request
		355	PT_AUTH_RES, // authentification response
190	PT_CONNECT_REQ, // want other host to contact me	356	PT_CONNECT_REQ, // want other host to contact me
191	PT_CONNECT_INFO, // request connection to some node	357	PT_CONNECT_INFO, // request connection to some node
192	PT_REKEY, // rekeying (not yet implemented)
193	PT_MAX	358	PT_MAX
194	};	359	};
195		360
196	u8 type;	361	u8 type;
197	u8 srcdst, src1, dst1;	362	u8 srcdst, src1, dst1;
198		363
199	void set_hdr (ptype type, unsigned int dst);	364	void set_hdr (ptype type, unsigned int dst);
200		365
201	unsigned int src ()	366	unsigned int src () const
202	{	367	{
203	return src1 | ((srcdst >> 4) << 8);	368	return src1 | ((srcdst >> 4) << 8);
204	}	369	}
		370
205	unsigned int dst ()	371	unsigned int dst () const
206	{	372	{
207	return dst1 | ((srcdst & 0xf) << 8);	373	return dst1 | ((srcdst & 0xf) << 8);
208	}	374	}
		375
209	ptype typ ()	376	ptype typ () const
210	{	377	{
211	return (ptype) type;	378	return (ptype) type;
212	}	379	}
213	};	380	};
214		381
…		…
252	u32 cl;	419	u32 cl;
253		420
254	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	421	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
255	if (cl)	422	if (cl)
256	{	423	{
257	//printf ("compressed packet, %d => %d\n", l, cl);//D
258	type = PT_DATA_COMPRESSED;	424	type = PT_DATA_COMPRESSED;
259	d = cdata;	425	d = cdata;
260	l = cl + 2;	426	l = cl + 2;
261		427
262	d[0] = cl >> 8;	428	d[0] = cl >> 8;
…		…
264	}	430	}
265	#endif	431	#endif
266		432
267	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	433	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);
268		434
		435	struct {
269	#if RAND_SIZE	436	#if RAND_SIZE
270	struct {
271	u8 rnd[RAND_SIZE];	437	u8 rnd[RAND_SIZE];
		438	#endif
272	u32 seqno;	439	u32 seqno;
273	} datahdr;	440	} datahdr;
274		441
275	datahdr.seqno = seqno;	442	datahdr.seqno = ntohl (seqno);
		443	#if RAND_SIZE
276	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	444	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
		445	#endif
277		446
278	EVP_EncryptUpdate (cctx,	447	EVP_EncryptUpdate (cctx,
279	(unsigned char *) data + outl, &outl2,	448	(unsigned char *) data + outl, &outl2,
280	(unsigned char *) &datahdr, DATAHDR);	449	(unsigned char *) &datahdr, DATAHDR);
281	outl += outl2;	450	outl += outl2;
282	#else
283	EVP_EncryptUpdate (cctx,
284	(unsigned char *) data + outl, &outl2,
285	(unsigned char *) &seqno, DATAHDR);
286	outl += outl2;
287	#endif
288		451
289	EVP_EncryptUpdate (cctx,	452	EVP_EncryptUpdate (cctx,
290	(unsigned char *) data + outl, &outl2,	453	(unsigned char *) data + outl, &outl2,
291	(unsigned char *) d, l);	454	(unsigned char *) d, l);
292	outl += outl2;	455	outl += outl2;
…		…
328	outl += outl2;	491	outl += outl2;
329		492
330	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	493	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);
331	outl += outl2;	494	outl += outl2;
332		495
333	seqno = *(u32 *)(d + RAND_SIZE);	496	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
334		497
335	id2mac (dst () ? dst() : THISNODE->id, p->dst);	498	id2mac (dst () ? dst() : THISNODE->id, p->dst);
336	id2mac (src (), p->src);	499	id2mac (src (), p->src);
337		500
338	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
339	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
340	{	503	{
341	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	504	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];
		505
342	p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6;	506	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,
343	//printf ("decompressxed %d(%d) => %d\n", cl, len - data_hdr_size (), p->len);//D	507	&(*p)[6 + 6], MAX_MTU)
		508	+ 6 + 6;
344	}	509	}
345	else	510	else
346	p->len = outl + (6 + 6 - DATAHDR);	511	p->len = outl + (6 + 6 - DATAHDR);
347	#endif	512	#endif
348		513
349	return p;	514	return p;
350	}	515	}
351		516
352	struct ping_packet : vpn_packet	517	struct ping_packet : vpn_packet
		518	{
		519	void setup (int dst, ptype type)
353	{	520	{
354	void setup (int dst, ptype type)
355	{
356	set_hdr (type, dst);	521	set_hdr (type, dst);
357	len = sizeof (*this) - sizeof (net_packet);	522	len = sizeof (*this) - sizeof (net_packet);
358	}
359	};	523	}
		524	};
360		525
361	struct config_packet : vpn_packet	526	struct config_packet : vpn_packet
		527	{
		528	// actually, hmaclen cannot be checked because the hmac
		529	// field comes before this data, so peers with other
		530	// hmacs simply will not work.
		531	u8 prot_major, prot_minor, randsize, hmaclen;
		532	u8 flags, challengelen, pad2, pad3;
		533	u32 cipher_nid, digest_nid, hmac_nid;
		534
		535	const u8 curflags () const
362	{	536	{
363	// actually, hmaclen cannot be checked because the hmac
364	// field comes before this data, so peers with other
365	// hmacs simply will not work.
366	u8 prot_major, prot_minor, randsize, hmaclen;
367	u8 flags, challengelen, pad2, pad3;
368	u32 cipher_nid;
369	u32 digest_nid;
370
371	const u8 curflags () const
372	{
373	return 0x80	537	return 0x80
374	| (ENABLE_COMPRESSION ? 0x01 : 0x00)	538	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
375	| (ENABLE_TRUST ? 0x02 : 0x00);
376	}	539	}
377		540
378	void setup (ptype type, int dst)	541	void setup (ptype type, int dst);
379	{	542	bool chk_config () const;
		543	};
		544
		545	void config_packet::setup (ptype type, int dst)
		546	{
380	prot_major = PROTOCOL_MAJOR;	547	prot_major = PROTOCOL_MAJOR;
381	prot_minor = PROTOCOL_MINOR;	548	prot_minor = PROTOCOL_MINOR;
382	randsize = RAND_SIZE;	549	randsize = RAND_SIZE;
383	hmaclen = HMACLENGTH;	550	hmaclen = HMACLENGTH;
384	flags = curflags ();	551	flags = curflags ();
385	challengelen = sizeof (rsachallenge);	552	challengelen = sizeof (rsachallenge);
386		553
387	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	554	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
388	digest_nid = htonl (EVP_MD_type (DIGEST));	555	digest_nid = htonl (EVP_MD_type (RSA_HASH));
		556	hmac_nid = htonl (EVP_MD_type (DIGEST));
389		557
390	len = sizeof (*this) - sizeof (net_packet);	558	len = sizeof (*this) - sizeof (net_packet);
391	set_hdr (type, dst);	559	set_hdr (type, dst);
392	}	560	}
393		561
394	bool chk_config ()	562	bool config_packet::chk_config () const
395	{	563	{
396	return prot_major == PROTOCOL_MAJOR	564	return prot_major == PROTOCOL_MAJOR
397	&& randsize == RAND_SIZE	565	&& randsize == RAND_SIZE
398	&& hmaclen == HMACLENGTH	566	&& hmaclen == HMACLENGTH
399	&& flags == curflags ()	567	&& flags == curflags ()
400	&& challengelen == sizeof (rsachallenge)	568	&& challengelen == sizeof (rsachallenge)
401	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	569	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))
		570	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))
402	&& digest_nid == htonl (EVP_MD_type (DIGEST));	571	&& hmac_nid == htonl (EVP_MD_type (DIGEST));
403	}	572	}
404	};
405		573
406	struct auth_packet : config_packet	574	struct auth_req_packet : config_packet
		575	{
		576	char magic[8];
		577	u8 initiate; // false if this is just an automatic reply
		578	u8 protocols; // supported protocols (will get patches on forward)
		579	u8 pad2, pad3;
		580	rsaid id;
		581	rsaencrdata encr;
		582
		583	auth_req_packet (int dst, bool initiate_, u8 protocols_)
407	{	584	{
408	char magic[8];
409	u8 subtype;
410	u8 pad1, pad2;
411	rsaencrdata challenge;
412
413	auth_packet (int dst, auth_subtype stype)
414	{
415	config_packet::setup (PT_AUTH, dst);	585	config_packet::setup (PT_AUTH_REQ, dst);
416	subtype = stype;	586	strncpy (magic, MAGIC, 8);
		587	initiate = !!initiate_;
		588	protocols = protocols_;
		589
417	len = sizeof (*this) - sizeof (net_packet);	590	len = sizeof (*this) - sizeof (net_packet);
418	strncpy (magic, MAGIC, 8);
419	}
420	};	591	}
		592	};
		593
		594	struct auth_res_packet : config_packet
		595	{
		596	rsaid id;
		597	u8 pad1, pad2, pad3;
		598	u8 response_len; // encrypted length
		599	rsaresponse response;
		600
		601	auth_res_packet (int dst)
		602	{
		603	config_packet::setup (PT_AUTH_RES, dst);
		604
		605	len = sizeof (*this) - sizeof (net_packet);
		606	}
		607	};
421		608
422	struct connect_req_packet : vpn_packet	609	struct connect_req_packet : vpn_packet
		610	{
		611	u8 id, protocols;
		612	u8 pad1, pad2;
		613
		614	connect_req_packet (int dst, int id_, u8 protocols_)
		615	: id(id_)
		616	, protocols(protocols_)
423	{	617	{
424	u8 id;
425	u8 pad1, pad2, pad3;
426
427	connect_req_packet (int dst, int id)
428	{
429	this->id = id;
430	set_hdr (PT_CONNECT_REQ, dst);	618	set_hdr (PT_CONNECT_REQ, dst);
431	len = sizeof (*this) - sizeof (net_packet);	619	len = sizeof (*this) - sizeof (net_packet);
432	}
433	};	620	}
		621	};
434		622
435	struct connect_info_packet : vpn_packet	623	struct connect_info_packet : vpn_packet
		624	{
		625	u8 id, protocols;
		626	u8 pad1, pad2;
		627	sockinfo si;
		628
		629	connect_info_packet (int dst, int id_, const sockinfo &si_, u8 protocols_)
		630	: id(id_)
		631	, protocols(protocols_)
		632	, si(si_)
436	{	633	{
437	u8 id;
438	u8 pad1, pad2, pad3;
439	sockinfo si;
440
441	connect_info_packet (int dst, int id, sockinfo &si)
442	{
443	this->id = id;
444	this->si = si;
445	set_hdr (PT_CONNECT_INFO, dst);	634	set_hdr (PT_CONNECT_INFO, dst);
		635
446	len = sizeof (*this) - sizeof (net_packet);	636	len = sizeof (*this) - sizeof (net_packet);
447	}
448	};	637	}
		638	};
449		639
450	/////////////////////////////////////////////////////////////////////////////	640	/////////////////////////////////////////////////////////////////////////////
451		641
452	void	642	void
453	fill_sa (SOCKADDR *sa, conf_node *conf)	643	connection::reset_dstaddr ()
454	{	644	{
455	sa->sin_family = AF_INET;	645	si.set (conf);
456	sa->sin_port = htons (conf->port);	646	}
457	sa->sin_addr.s_addr = 0;
458		647
		648	void
		649	connection::send_ping (const sockinfo &si, u8 pong)
		650	{
		651	ping_packet *pkt = new ping_packet;
		652
		653	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		654	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		655
		656	delete pkt;
		657	}
		658
		659	void
		660	connection::send_reset (const sockinfo &si)
		661	{
		662	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		663	{
		664	config_packet *pkt = new config_packet;
		665
		666	pkt->setup (vpn_packet::PT_RESET, conf->id);
		667	send_vpn_packet (pkt, si, IPTOS_MINCOST);
		668
		669	delete pkt;
		670	}
		671	}
		672
		673	void
		674	connection::send_auth_request (const sockinfo &si, bool initiate)
		675	{
		676	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		677
		678	protocol = best_protocol (THISNODE->protocols & conf->protocols);
		679
		680	rsachallenge chg;
		681
		682	rsa_cache.gen (pkt->id, chg);
		683
		684	if (0 > RSA_public_encrypt (sizeof chg,
		685	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
		686	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
		687	fatal ("RSA_public_encrypt error");
		688
		689	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
		690
		691	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		692
		693	delete pkt;
		694	}
		695
		696	void
		697	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
		698	{
		699	auth_res_packet *pkt = new auth_res_packet (conf->id);
		700
		701	pkt->id = id;
		702
		703	rsa_hash (id, chg, pkt->response);
		704
		705	pkt->hmac_set (octx);
		706
		707	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
		708
		709	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		710
		711	delete pkt;
		712	}
		713
		714	void
		715	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
		716	{
		717	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
		718	conf->id, rid, (const char *)rsi);
		719
		720	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
		721
		722	r->hmac_set (octx);
		723	send_vpn_packet (r, si);
		724
		725	delete r;
		726	}
		727
		728	void
		729	connection::establish_connection_cb (tstamp &ts)
		730	{
		731	if (ictx || conf == THISNODE
		732	|| connectmode == conf_node::C_NEVER
		733	|| connectmode == conf_node::C_DISABLED)
		734	ts = TSTAMP_CANCEL;
		735	else if (ts <= NOW)
		736	{
		737	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
		738
		739	if (retry_int < 3600 * 8)
		740	retry_cnt++;
		741
		742	ts = NOW + retry_int;
		743
459	if (conf->hostname)	744	if (conf->hostname)
460	{	745	{
461	struct hostent *he = gethostbyname (conf->hostname);	746	reset_dstaddr ();
462		747	if (si.host && auth_rate_limiter.can (si))
463	if (he
464	&& he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0])
465	{	748	{
466	//sa->sin_family = he->h_addrtype;	749	if (retry_cnt < 4)
467	memcpy (&sa->sin_addr, he->h_addr_list[0], 4);	750	send_auth_request (si, true);
		751	else
		752	send_ping (si, 0);
		753	}
468	}	754	}
469	else	755	else
470	slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname);
471	}
472	}
473
474	void
475	connection::reset_dstaddr ()
476	{
477	fill_sa (&sa, conf);
478	}
479
480	void
481	connection::send_ping (SOCKADDR *dsa, u8 pong)
482	{
483	ping_packet *pkt = new ping_packet;
484
485	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
486	vpn->send_vpn_packet (pkt, dsa);
487
488	delete pkt;
489	}
490
491	void
492	connection::send_reset (SOCKADDR *dsa)
493	{
494	static net_rate_limiter limiter(1);
495
496	if (limiter.can (dsa))
497	{
498	config_packet *pkt = new config_packet;
499
500	pkt->setup (vpn_packet::PT_RESET, conf->id);
501	vpn->send_vpn_packet (pkt, dsa);
502
503	delete pkt;
504	}
505	}
506
507	static rsachallenge *
508	gen_challenge (SOCKADDR *sa)
509	{
510	static rsachallenge k;
511
512	memcpy (&k, &challenge_bytes (), sizeof (k));
513	RAND_bytes ((unsigned char *)&k[CHG_SEQNO], sizeof (u32));
514	xor_sa (k, sa);
515
516	return &k;
517	}
518
519	void
520	connection::send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k)
521	{
522	static net_rate_limiter limiter(2);
523
524	if (subtype != AUTH_INIT || limiter.can (sa))
525	{
526	auth_packet *pkt = new auth_packet (conf->id, subtype);
527
528	//printf ("send auth_packet subtype %d\n", subtype);//D
529
530	if (!k)
531	k = gen_challenge (sa);
532
533	#if ENABLE_TRUST
534	if (0 > RSA_public_encrypt (sizeof (*k),
535	(unsigned char *)k, (unsigned char *)&pkt->challenge,
536	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
537	fatal ("RSA_public_encrypt error");
538	#else
539	# error untrusted mode not yet implemented: programemr does not know how to
540	rsaencrdata enc;
541
542	if (0 > RSA_private_encrypt (sizeof (*k),
543	(unsigned char *)k, (unsigned char *)&enc,
544	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
545	fatal ("RSA_private_encrypt error");
546
547	if (0 > RSA_public_encrypt (sizeof (enc),
548	(unsigned char *)enc, (unsigned char *)&pkt->challenge,
549	conf->rsa_key, RSA_NO_PADDING))
550	fatal ("RSA_public_encrypt error");
551	#endif
552
553	slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa));
554
555	vpn->send_vpn_packet (pkt, sa);
556
557	delete pkt;
558	}
559	}
560
561	void
562	connection::establish_connection ()
563	{
564	if (!ictx && conf != THISNODE && conf->connectmode != conf_node::C_NEVER)
565	{
566	if (now >= next_retry)
567	{
568	int retry_int = retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2);
569
570	if (retry_cnt < (17 << 2) | 3)
571	retry_cnt++;
572
573	if (conf->connectmode == conf_node::C_ONDEMAND
574	&& retry_int > ::conf.keepalive)
575	retry_int = ::conf.keepalive;
576
577	next_retry = now + retry_int;
578	next_wakeup (next_retry);
579
580	if (conf->hostname)
581	{
582	reset_dstaddr ();
583	if (sa.sin_addr.s_addr)
584	if (retry_cnt < 4)
585	send_auth (AUTH_INIT, &sa);
586	else
587	send_ping (&sa, 0);
588	}
589	else
590	vpn->connect_request (conf->id);	756	vpn->connect_request (conf->id);
591	}
592	}	757	}
593	}	758	}
594		759
595	void	760	void
596	connection::reset_connection ()	761	connection::reset_connection ()
597	{	762	{
598	if (ictx && octx)	763	if (ictx && octx)
599	{	764	{
600	slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename);	765	slog (L_INFO, _("%s(%s): connection lost"),
		766	conf->nodename, (const char *)si);
601		767
602	if (::conf.script_node_down)	768	if (::conf.script_node_down)
603	run_script (this, &connection::script_node_down, false);	769	run_script (run_script_cb (this, &connection::script_node_down), false);
604	}	770	}
605		771
606	delete ictx;	772	delete ictx; ictx = 0;
607	ictx = 0;	773	delete octx; octx = 0;
608		774
609	delete octx;	775	si.host= 0;
610	octx = 0;
611		776
612	sa.sin_port = 0;
613	sa.sin_addr.s_addr = 0;
614
615	next_retry = 0;
616	next_rekey = 0;
617	last_activity = 0;	777	last_activity = 0;
		778	retry_cnt = 0;
		779
		780	rekey.reset ();
		781	keepalive.reset ();
		782	establish_connection.reset ();
618	}	783	}
619		784
620	void	785	void
621	connection::shutdown ()	786	connection::shutdown ()
622	{	787	{
623	if (ictx && octx)	788	if (ictx && octx)
624	send_reset (&sa);	789	send_reset (si);
625		790
626	reset_connection ();	791	reset_connection ();
627	}	792	}
628		793
629	void	794	void
630	connection::rekey ()	795	connection::rekey_cb (tstamp &ts)
631	{	796	{
		797	ts = TSTAMP_CANCEL;
		798
632	reset_connection ();	799	reset_connection ();
633	establish_connection ();	800	establish_connection ();
634	}	801	}
635		802
636	void	803	void
637	connection::send_data_packet (tap_packet * pkt, bool broadcast)	804	connection::send_data_packet (tap_packet *pkt, bool broadcast)
638	{	805	{
639	vpndata_packet *p = new vpndata_packet;	806	vpndata_packet *p = new vpndata_packet;
		807	int tos = 0;
		808
		809	if (conf->inherit_tos
		810	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
		811	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
		812	tos = (*pkt)[15] & IPTOS_TOS_MASK;
640		813
641	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
642	vpn->send_vpn_packet (p, &sa);	815	send_vpn_packet (p, si, tos);
643		816
644	delete p;	817	delete p;
645		818
646	if (oseqno > MAX_SEQNO)	819	if (oseqno > MAX_SEQNO)
647	rekey ();	820	rekey ();
…		…
660	establish_connection ();	833	establish_connection ();
661	}	834	}
662	}	835	}
663		836
664	void	837	void
665	connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa)	838	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
666	{	839	{
667	last_activity = now;	840	last_activity = NOW;
668		841
669	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	842	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
670	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	843	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
671		844
672	switch (pkt->typ ())	845	switch (pkt->typ ())
673	{	846	{
674	case vpn_packet::PT_PING:	847	case vpn_packet::PT_PING:
		848	// we send pings instead of auth packets after some retries,
		849	// so reset the retry counter and establish a connection
		850	// when we receive a ping.
		851	if (!ictx)
		852	{
		853	if (auth_rate_limiter.can (rsi))
		854	send_auth_request (rsi, true);
		855	}
		856	else
675	send_ping (ssa, 1); // pong	857	send_ping (rsi, 1); // pong
		858
676	break;	859	break;
677		860
678	case vpn_packet::PT_PONG:	861	case vpn_packet::PT_PONG:
679	// we send pings instead of auth packets after some retries,
680	// so reset the retry counter and establish a conenction
681	// when we receive a pong.
682	if (!ictx && !octx)
683	{
684	retry_cnt = 0;
685	next_retry = 0;
686	establish_connection ();
687	}
688
689	break;	862	break;
690		863
691	case vpn_packet::PT_RESET:	864	case vpn_packet::PT_RESET:
692	{	865	{
693	reset_connection ();	866	reset_connection ();
694		867
695	config_packet *p = (config_packet *) pkt;	868	config_packet *p = (config_packet *) pkt;
		869
696	if (p->chk_config ())	870	if (!p->chk_config ())
		871	{
		872	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		873	conf->nodename, (const char *)rsi);
		874	connectmode = conf_node::C_DISABLED;
		875	}
697	if (conf->connectmode == conf_node::C_ALWAYS)	876	else if (connectmode == conf_node::C_ALWAYS)
698	establish_connection ();	877	establish_connection ();
699
700	//D slog the protocol mismatch?
701	}	878	}
702	break;	879	break;
703		880
704	case vpn_packet::PT_AUTH:	881	case vpn_packet::PT_AUTH_REQ:
		882	if (auth_rate_limiter.can (rsi))
		883	{
		884	auth_req_packet *p = (auth_req_packet *) pkt;
		885
		886	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		887
		888	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		889	{
		890	if (p->prot_minor != PROTOCOL_MINOR)
		891	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		892	conf->nodename, (const char *)rsi,
		893	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		894
		895	if (p->initiate)
		896	send_auth_request (rsi, false);
		897
		898	rsachallenge k;
		899
		900	if (0 > RSA_private_decrypt (sizeof (p->encr),
		901	(unsigned char *)&p->encr, (unsigned char *)&k,
		902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
		903	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
		904	conf->nodename, (const char *)rsi);
		905	else
		906	{
		907	retry_cnt = 0;
		908	establish_connection.set (NOW + 8); //? ;)
		909	keepalive.reset ();
		910	rekey.reset ();
		911
		912	delete ictx;
		913	ictx = 0;
		914
		915	delete octx;
		916
		917	octx = new crypto_ctx (k, 1);
		918	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
		919
		920	conf->protocols = p->protocols;
		921	send_auth_response (rsi, p->id, k);
		922
		923	break;
		924	}
		925	}
		926
		927	send_reset (rsi);
		928	}
		929
		930	break;
		931
		932	case vpn_packet::PT_AUTH_RES:
705	{	933	{
706	auth_packet *p = (auth_packet *) pkt;	934	auth_res_packet *p = (auth_res_packet *) pkt;
707		935
708	slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype);	936	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
709		937
710	if (p->chk_config ()	938	if (p->chk_config ())
711	&& !strncmp (p->magic, MAGIC, 8))
712	{	939	{
713	if (p->prot_minor != PROTOCOL_MINOR)	940	if (p->prot_minor != PROTOCOL_MINOR)
714	slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."),	941	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		942	conf->nodename, (const char *)rsi,
715	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	943	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
716		944
717	if (p->subtype == AUTH_INIT)
718	send_auth (AUTH_INITREPLY, ssa);
719
720	rsachallenge k;	945	rsachallenge chg;
721		946
722	#if ENABLE_TRUST	947	if (!rsa_cache.find (p->id, chg))
723	if (0 > RSA_private_decrypt (sizeof (rsaencrdata),	948	slog (L_ERR, _("%s(%s): unrequested auth response"),
724	(unsigned char *)&p->challenge, (unsigned char *)&k,	949	conf->nodename, (const char *)rsi);
725	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
726	// continued below
727	#else
728	rsaencrdata j;
729		950	else
730	if (0 > RSA_private_decrypt (sizeof (rsaencrdata),
731	(unsigned char *)&p->challenge, (unsigned char *)&j,
732	::conf.rsa_key, RSA_NO_PADDING))
733	fatal ("RSA_private_decrypt error");
734
735	if (0 > RSA_public_decrypt (sizeof (k),
736	(unsigned char *)&j, (unsigned char *)&k,
737	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
738	// continued below
739	#endif
740	{	951	{
741	slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"),	952	crypto_ctx *cctx = new crypto_ctx (chg, 0);
		953
		954	if (!p->hmac_chk (cctx))
		955	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		956	"could be an attack, or just corruption or an synchronization error"),
742	conf->nodename, (const char *)sockinfo (ssa));	957	conf->nodename, (const char *)rsi);
743	break;	958	else
744	}
745
746	retry_cnt = 0;
747	next_retry = now + 8;
748
749	switch (p->subtype)
750	{
751	case AUTH_INIT:
752	case AUTH_INITREPLY:
753	delete ictx;
754	ictx = 0;
755
756	delete octx;
757
758	octx = new crypto_ctx (k, 1);
759	oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff;
760
761	send_auth (AUTH_REPLY, ssa, &k);
762	break;
763
764	case AUTH_REPLY:
765
766	if (!memcmp ((u8 *)gen_challenge (ssa) + sizeof (u32), (u8 *)&k + sizeof (u32),
767	sizeof (rsachallenge) - sizeof (u32)))
768	{	959	{
769	delete ictx;
770
771	ictx = new crypto_ctx (k, 0);
772	iseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff; // at least 2**31 sequence numbers are valid
773	ismask = 0xffffffff; // initially, all lower sequence numbers are invalid
774
775	sa = *ssa;	960	rsaresponse h;
776		961
777	next_rekey = now + ::conf.rekey;	962	rsa_hash (p->id, chg, h);
778	next_wakeup (next_rekey);
779		963
780	// send queued packets	964	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
781	while (tap_packet *p = queue.get ())
782	{	965	{
		966	prot_minor = p->prot_minor;
		967
		968	delete ictx; ictx = cctx;
		969
		970	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		971
		972	si = rsi;
		973
		974	rekey.set (NOW + ::conf.rekey);
		975	keepalive.set (NOW + ::conf.keepalive);
		976
		977	// send queued packets
		978	while (tap_packet *p = queue.get ())
		979	{
783	send_data_packet (p);	980	send_data_packet (p);
784	delete p;	981	delete p;
		982	}
		983
		984	connectmode = conf->connectmode;
		985
		986	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
		987	conf->nodename, (const char *)rsi,
		988	strprotocol (protocol),
		989	p->prot_major, p->prot_minor);
		990
		991	if (::conf.script_node_up)
		992	run_script (run_script_cb (this, &connection::script_node_up), false);
		993
		994	break;
785	}	995	}
786		996	else
787	slog (L_INFO, _("connection to %d (%s %s) established"),	997	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
788	conf->id, conf->nodename, (const char *)sockinfo (ssa));	998	conf->nodename, (const char *)rsi);
789
790	if (::conf.script_node_up)
791	run_script (this, &connection::script_node_up, false);
792	}	999	}
		1000
793	else	1001	delete cctx;
794	slog (L_ERR, _("sent and received challenge do not match with (%s %s))"),
795	conf->nodename, (const char *)sockinfo (ssa));
796
797	break;
798	default:
799	slog (L_ERR, _("authentification illegal subtype error (%s %s)"),
800	conf->nodename, (const char *)sockinfo (ssa));
801	break;
802	}	1002	}
803	}	1003	}
804	else
805	send_reset (ssa);
806
807	break;
808	}	1004	}
		1005
		1006	send_reset (rsi);
		1007	break;
809		1008
810	case vpn_packet::PT_DATA_COMPRESSED:	1009	case vpn_packet::PT_DATA_COMPRESSED:
811	#if !ENABLE_COMPRESSION	1010	#if !ENABLE_COMPRESSION
812	send_reset (ssa);	1011	send_reset (rsi);
813	break;	1012	break;
814	#endif	1013	#endif
		1014
815	case vpn_packet::PT_DATA_UNCOMPRESSED:	1015	case vpn_packet::PT_DATA_UNCOMPRESSED:
816		1016
817	if (ictx && octx)	1017	if (ictx && octx)
818	{	1018	{
819	vpndata_packet *p = (vpndata_packet *)pkt;	1019	vpndata_packet *p = (vpndata_packet *)pkt;
820		1020
821	if (*ssa == sa)	1021	if (rsi == si)
822	{	1022	{
823	if (!p->hmac_chk (ictx))	1023	if (!p->hmac_chk (ictx))
824	slog (L_ERR, _("hmac authentication error, received invalid packet\n"	1024	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
825	"could be an attack, or just corruption or an synchronization error"));	1025	"could be an attack, or just corruption or an synchronization error"),
		1026	conf->nodename, (const char *)rsi);
826	else	1027	else
827	{	1028	{
828	u32 seqno;	1029	u32 seqno;
829	tap_packet *d = p->unpack (this, seqno);	1030	tap_packet *d = p->unpack (this, seqno);
830		1031
831	if (seqno <= iseqno - 32)	1032	if (iseqno.recv_ok (seqno))
832	slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n"
833	"possible replay attack, or just massive packet reordering"), seqno, iseqno + 1);//D
834	else if (seqno > iseqno + 32)
835	slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n"
836	"possible replay attack, or just massive packet loss"), seqno, iseqno + 1);//D
837	else
838	{	1033	{
839	if (seqno > iseqno)
840	{
841	ismask <<= seqno - iseqno;
842	iseqno = seqno;
843	}
844
845	u32 mask = 1 << (iseqno - seqno);
846
847	//printf ("received seqno %08lx, iseqno %08lx, mask %08lx is %08lx\n", seqno, iseqno, mask, ismask);
848	if (ismask & mask)
849	slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n"
850	"possible replay attack, or just packet duplication"), seqno, iseqno + 1);//D
851	else
852	{
853	ismask |= mask;
854
855	vpn->tap->send (d);	1034	vpn->tap->send (d);
856		1035
857	if (p->dst () == 0) // re-broadcast	1036	if (p->dst () == 0) // re-broadcast
858	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1037	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
859	{	1038	{
860	connection *c = *i;	1039	connection *c = *i;
861		1040
862	if (c->conf != THISNODE && c->conf != conf)	1041	if (c->conf != THISNODE && c->conf != conf)
863	c->inject_data_packet (d);	1042	c->inject_data_packet (d);
864	}
865
866	delete d;
867
868	break;
869	}	1043	}
		1044
		1045	delete d;
		1046
		1047	break;
870	}	1048	}
871	}	1049	}
872	}	1050	}
873	else	1051	else
874	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D	1052	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
875	}	1053	}
876		1054
877	send_reset (ssa);	1055	send_reset (rsi);
878	break;	1056	break;
879		1057
880	case vpn_packet::PT_CONNECT_REQ:	1058	case vpn_packet::PT_CONNECT_REQ:
881	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1059	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
882	{	1060	{
883	connect_req_packet *p = (connect_req_packet *) pkt;	1061	connect_req_packet *p = (connect_req_packet *) pkt;
884		1062
885	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1063	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
886		1064	conf->protocols = p->protocols;
887	connection *c = vpn->conns[p->id - 1];	1065	connection *c = vpn->conns[p->id - 1];
888		1066
889	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1067	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
890	conf->id, p->id, c->ictx && c->octx);	1068	conf->id, p->id, c->ictx && c->octx);
891		1069
892	if (c->ictx && c->octx)	1070	if (c->ictx && c->octx)
893	{	1071	{
894	sockinfo si(sa);	1072	// send connect_info packets to both sides, in case one is
895		1073	// behind a nat firewall (or both ;)
896	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1074	c->send_connect_info (conf->id, si, conf->protocols);
897	c->conf->id, p->id, (const char *)si);	1075	send_connect_info (c->conf->id, c->si, c->conf->protocols);
898
899	connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si);
900
901	r->hmac_set (c->octx);
902	vpn->send_vpn_packet (r, &c->sa);
903
904	delete r;
905	}	1076	}
906	}	1077	}
907		1078
908	break;	1079	break;
909		1080
910	case vpn_packet::PT_CONNECT_INFO:	1081	case vpn_packet::PT_CONNECT_INFO:
911	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
912	{	1083	{
913	connect_info_packet *p = (connect_info_packet *) pkt;	1084	connect_info_packet *p = (connect_info_packet *) pkt;
914		1085
915	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1086	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
916		1087	conf->protocols = p->protocols;
917	connection *c = vpn->conns[p->id - 1];	1088	connection *c = vpn->conns[p->id - 1];
918		1089
919	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1090	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
920	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1091	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
921		1092
922	c->send_auth (AUTH_INIT, p->si.sa ());	1093	c->send_auth_request (p->si, true);
923	}	1094	}
		1095
924	break;	1096	break;
925		1097
926	default:	1098	default:
927	send_reset (ssa);	1099	send_reset (rsi);
928	break;	1100	break;
929	}
930	}
931		1101
932	void connection::timer ()
933	{
934	if (conf != THISNODE)
935	{	1102	}
936	if (now >= next_retry && conf->connectmode == conf_node::C_ALWAYS)	1103	}
		1104
		1105	void connection::keepalive_cb (tstamp &ts)
		1106	{
		1107	if (NOW >= last_activity + ::conf.keepalive + 30)
		1108	{
		1109	reset_connection ();
937	establish_connection ();	1110	establish_connection ();
938		1111	}
939	if (ictx && octx)
940	{
941	if (now >= next_rekey)
942	rekey ();
943	else if (now >= last_activity + ::conf.keepalive + 30)
944	{
945	reset_connection ();
946	establish_connection ();
947	}
948	else if (now >= last_activity + ::conf.keepalive)	1112	else if (NOW < last_activity + ::conf.keepalive)
		1113	ts = last_activity + ::conf.keepalive;
949	if (conf->connectmode != conf_node::C_ONDEMAND	1114	else if (conf->connectmode != conf_node::C_ONDEMAND
950	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1115	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
		1116	{
951	send_ping (&sa);	1117	send_ping (si);
952	else	1118	ts = NOW + 5;
		1119	}
		1120	else
953	reset_connection ();	1121	reset_connection ();
954
955	}
956	}
957	}	1122	}
958		1123
959	void connection::connect_request (int id)	1124	void connection::connect_request (int id)
960	{	1125	{
961	connect_req_packet *p = new connect_req_packet (conf->id, id);	1126	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
962		1127
963	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);	1128	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
964	p->hmac_set (octx);	1129	p->hmac_set (octx);
965	vpn->send_vpn_packet (p, &sa);	1130	send_vpn_packet (p, si);
966		1131
967	delete p;	1132	delete p;
968	}	1133	}
969		1134
970	void connection::script_node ()	1135	void connection::script_node ()
971	{	1136	{
972	vpn->script_if_up ();	1137	vpn->script_if_up (0);
973		1138
974	char *env;	1139	char *env;
975	asprintf (&env, "DESTID=%d", conf->id);	1140	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
976	putenv (env);
977	asprintf (&env, "DESTNODE=%s", conf->nodename);	1141	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
978	putenv (env);	1142	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
979	asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr));
980	putenv (env);
981	asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port));	1143	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
982	putenv (env);
983	}	1144	}
984		1145
985	const char *connection::script_node_up ()	1146	const char *connection::script_node_up (int)
986	{	1147	{
987	script_node ();	1148	script_node ();
988		1149
989	putenv ("STATE=up");	1150	putenv ("STATE=up");
990		1151
991	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1152	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
992	}	1153	}
993		1154
994	const char *connection::script_node_down ()	1155	const char *connection::script_node_down (int)
995	{	1156	{
996	script_node ();	1157	script_node ();
997		1158
998	putenv ("STATE=down");	1159	putenv ("STATE=down");
999		1160
1000	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1161	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1001	}	1162	}
1002		1163
		1164	// send a vpn packet out to other hosts
		1165	void
		1166	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1167	{
		1168	if (protocol & PROT_IPv4)
		1169	vpn->send_ipv4_packet (pkt, si, tos);
		1170	else
		1171	vpn->send_udpv4_packet (pkt, si, tos);
		1172	}
		1173
		1174	connection::connection(struct vpn *vpn_)
		1175	: vpn(vpn_)
		1176	, rekey (this, &connection::rekey_cb)
		1177	, keepalive (this, &connection::keepalive_cb)
		1178	, establish_connection (this, &connection::establish_connection_cb)
		1179	{
		1180	octx = ictx = 0;
		1181	retry_cnt = 0;
		1182
		1183	connectmode = conf_node::C_ALWAYS; // initial setting
		1184	reset_connection ();
		1185	}
		1186
		1187	connection::~connection ()
		1188	{
		1189	shutdown ();
		1190	}
		1191
1003	/////////////////////////////////////////////////////////////////////////////	1192	/////////////////////////////////////////////////////////////////////////////
1004		1193
1005	vpn::vpn (void)
1006	{}
1007
1008	const char *vpn::script_if_up ()	1194	const char *vpn::script_if_up (int)
1009	{	1195	{
1010	// the tunnel device mtu should be the physical mtu - overhead	1196	// the tunnel device mtu should be the physical mtu - overhead
1011	// the tricky part is rounding to the cipher key blocksize	1197	// the tricky part is rounding to the cipher key blocksize
1012	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD;	1198	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
1013	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	1199	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
1014	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	1200	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
1015	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	1201	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
1016		1202
1017	char *env;	1203	char *env;
…		…
1032		1218
1033	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	1219	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
1034	}	1220	}
1035		1221
1036	int	1222	int
1037	vpn::setup (void)	1223	vpn::setup ()
1038	{	1224	{
1039	struct sockaddr_in sa;	1225	sockinfo si;
1040		1226
		1227	si.set (THISNODE);
		1228
		1229	udpv4_fd = -1;
		1230
		1231	if (THISNODE->protocols & PROT_UDPv4)
		1232	{
1041	socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	1233	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
1042	if (socket_fd < 0)	1234
		1235	if (udpv4_fd < 0)
1043	return -1;	1236	return -1;
1044		1237
1045	fill_sa (&sa, THISNODE);	1238	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
1046		1239	{
1047	if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa)))
1048	{
1049	slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno));	1240	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
1050	exit (1);	1241	exit (1);
1051	}	1242	}
1052		1243
1053	#ifdef IP_MTU_DISCOVER	1244	#ifdef IP_MTU_DISCOVER
1054	// this I really consider a linux bug. I am neither connected	1245	// this I really consider a linux bug. I am neither connected
1055	// nor do I fragment myself. Linux still sets DF and doesn't	1246	// nor do I fragment myself. Linux still sets DF and doesn't
1056	// fragment for me sometimes.	1247	// fragment for me sometimes.
1057	{	1248	{
1058	int oval = IP_PMTUDISC_DONT;	1249	int oval = IP_PMTUDISC_DONT;
1059	setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	1250	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
1060	}	1251	}
1061	#endif	1252	#endif
1062	{	1253
		1254	// standard daemon practise...
		1255	{
1063	int oval = 1;	1256	int oval = 1;
1064	setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	1257	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		1258	}
		1259
		1260	udpv4_ev_watcher.start (udpv4_fd, POLLIN);
1065	}	1261	}
		1262
		1263	ipv4_fd = -1;
		1264	if (THISNODE->protocols & PROT_IPv4)
		1265	{
		1266	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		1267
		1268	if (ipv4_fd < 0)
		1269	return -1;
		1270
		1271	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		1272	{
		1273	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
		1274	exit (1);
		1275	}
		1276
		1277	#ifdef IP_MTU_DISCOVER
		1278	// this I really consider a linux bug. I am neither connected
		1279	// nor do I fragment myself. Linux still sets DF and doesn't
		1280	// fragment for me sometimes.
		1281	{
		1282	int oval = IP_PMTUDISC_DONT;
		1283	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		1284	}
		1285	#endif
		1286
		1287	ipv4_ev_watcher.start (ipv4_fd, POLLIN);
		1288	}
1066		1289
1067	tap = new tap_device ();	1290	tap = new tap_device ();
1068	if (!tap) //D this, of course, never catches	1291	if (!tap) //D this, of course, never catches
1069	{	1292	{
1070	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	1293	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
1071	exit (1);	1294	exit (1);
1072	}	1295	}
1073		1296
1074	run_script (this, &vpn::script_if_up, true);	1297	run_script (run_script_cb (this, &vpn::script_if_up), true);
		1298
		1299	tap_ev_watcher.start (tap->fd, POLLIN);
		1300
		1301	reconnect_all ();
1075		1302
1076	return 0;	1303	return 0;
1077	}	1304	}
1078		1305
1079	void	1306	void
1080	vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa)	1307	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1081	{	1308	{
1082	sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa));	1309	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		1310	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		1311	}
		1312
		1313	void
		1314	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1315	{
		1316	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		1317	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		1318	}
		1319
		1320	void
		1321	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
		1322	{
		1323	unsigned int src = pkt->src ();
		1324	unsigned int dst = pkt->dst ();
		1325
		1326	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
		1327	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
		1328
		1329	if (src == 0 || src > conns.size ()
		1330	|| dst > conns.size ()
		1331	|| pkt->typ () >= vpn_packet::PT_MAX)
		1332	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		1333	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		1334	else
		1335	{
		1336	connection *c = conns[src - 1];
		1337
		1338	if (dst == 0 && !THISNODE->routerprio)
		1339	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),
		1340	c->conf->nodename, (const char *)rsi);
		1341	else if (dst != 0 && dst != THISNODE->id)
		1342	// FORWARDING NEEDED ;)
		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 *)rsi,
		1347	THISNODE->id, THISNODE->nodename);
		1348	else
		1349	c->recv_vpn_packet (pkt, rsi);
		1350	}
		1351	}
		1352
		1353	void
		1354	vpn::udpv4_ev (short revents)
		1355	{
		1356	if (revents & (POLLIN | POLLERR))
		1357	{
		1358	vpn_packet *pkt = new vpn_packet;
		1359	struct sockaddr_in sa;
		1360	socklen_t sa_len = sizeof (sa);
		1361	int len;
		1362
		1363	len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1364
		1365	sockinfo si(sa);
		1366
		1367	if (len > 0)
		1368	{
		1369	pkt->len = len;
		1370
		1371	recv_vpn_packet (pkt, si);
		1372	}
		1373	else
		1374	{
		1375	// probably ECONNRESET or somesuch
		1376	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1377	}
		1378
		1379	delete pkt;
		1380	}
		1381	else if (revents & POLLHUP)
		1382	{
		1383	// this cannot ;) happen on udp sockets
		1384	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
		1385	exit (1);
		1386	}
		1387	else
		1388	{
		1389	slog (L_ERR,
		1390	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1391	revents);
		1392	exit (1);
		1393	}
		1394	}
		1395
		1396	void
		1397	vpn::ipv4_ev (short revents)
		1398	{
		1399	if (revents & (POLLIN | POLLERR))
		1400	{
		1401	vpn_packet *pkt = new vpn_packet;
		1402	struct sockaddr_in sa;
		1403	socklen_t sa_len = sizeof (sa);
		1404	int len;
		1405
		1406	len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1407
		1408	sockinfo si(sa, PROT_IPv4);
		1409
		1410	if (len > 0)
		1411	{
		1412	pkt->len = len;
		1413
		1414	// raw sockets deliver the ipv4, but don't expect it on sends
		1415	// this is slow, but...
		1416	pkt->skip_hdr (IP_OVERHEAD);
		1417
		1418	recv_vpn_packet (pkt, si);
		1419	}
		1420	else
		1421	{
		1422	// probably ECONNRESET or somesuch
		1423	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1424	}
		1425
		1426	delete pkt;
		1427	}
		1428	else if (revents & POLLHUP)
		1429	{
		1430	// this cannot ;) happen on udp sockets
		1431	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
		1432	exit (1);
		1433	}
		1434	else
		1435	{
		1436	slog (L_ERR,
		1437	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1438	revents);
		1439	exit (1);
		1440	}
		1441	}
		1442
		1443	void
		1444	vpn::tap_ev (short revents)
		1445	{
		1446	if (revents & POLLIN)
		1447	{
		1448	/* process data */
		1449	tap_packet *pkt;
		1450
		1451	pkt = tap->recv ();
		1452
		1453	int dst = mac2id (pkt->dst);
		1454	int src = mac2id (pkt->src);
		1455
		1456	if (src != THISNODE->id)
		1457	{
		1458	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
		1459	exit (1);
		1460	}
		1461
		1462	if (dst == THISNODE->id)
		1463	{
		1464	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
		1465	exit (1);
		1466	}
		1467
		1468	if (dst > conns.size ())
		1469	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
		1470	else
		1471	{
		1472	if (dst)
		1473	{
		1474	// unicast
		1475	if (dst != THISNODE->id)
		1476	conns[dst - 1]->inject_data_packet (pkt);
		1477	}
		1478	else
		1479	{
		1480	// broadcast, first check router, then self, then english
		1481	connection *router = find_router ();
		1482
		1483	if (router)
		1484	router->inject_data_packet (pkt, true);
		1485	else
		1486	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1487	if ((*c)->conf != THISNODE)
		1488	(*c)->inject_data_packet (pkt);
		1489	}
		1490	}
		1491
		1492	delete pkt;
		1493	}
		1494	else if (revents & (POLLHUP | POLLERR))
		1495	{
		1496	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
		1497	exit (1);
		1498	}
		1499	else
		1500	abort ();
		1501	}
		1502
		1503	void
		1504	vpn::event_cb (tstamp &ts)
		1505	{
		1506	if (events)
		1507	{
		1508	if (events & EVENT_SHUTDOWN)
		1509	{
		1510	slog (L_INFO, _("preparing shutdown..."));
		1511
		1512	shutdown_all ();
		1513
		1514	remove_pid (pidfilename);
		1515
		1516	slog (L_INFO, _("terminating"));
		1517
		1518	exit (0);
		1519	}
		1520
		1521	if (events & EVENT_RECONNECT)
		1522	{
		1523	slog (L_INFO, _("forced reconnect"));
		1524
		1525	reconnect_all ();
		1526	}
		1527
		1528	events = 0;
		1529	}
		1530
		1531	ts = TSTAMP_CANCEL;
1083	}	1532	}
1084		1533
1085	void	1534	void
1086	vpn::shutdown_all ()	1535	vpn::shutdown_all ()
1087	{	1536	{
…		…
1095	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1544	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
1096	delete *c;	1545	delete *c;
1097		1546
1098	conns.clear ();	1547	conns.clear ();
1099		1548
		1549	auth_rate_limiter.clear ();
		1550	reset_rate_limiter.clear ();
		1551
1100	for (configuration::node_vector::iterator i = conf.nodes.begin ();	1552	for (configuration::node_vector::iterator i = conf.nodes.begin ();
1101	i != conf.nodes.end (); ++i)	1553	i != conf.nodes.end (); ++i)
1102	{	1554	{
1103	connection *conn = new connection (this);	1555	connection *conn = new connection (this);
1104		1556
1105	conn->conf = *i;	1557	conn->conf = *i;
1106	conns.push_back (conn);	1558	conns.push_back (conn);
1107		1559
1108	if (conn->conf->connectmode == conf_node::C_ALWAYS)
1109	conn->establish_connection ();	1560	conn->establish_connection ();
1110	}	1561	}
1111	}	1562	}
1112		1563
1113	connection *vpn::find_router ()	1564	connection *vpn::find_router ()
1114	{	1565	{
…		…
1118	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	1569	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
1119	{	1570	{
1120	connection *c = *i;	1571	connection *c = *i;
1121		1572
1122	if (c->conf->routerprio > prio	1573	if (c->conf->routerprio > prio
1123	&& c->conf->connectmode == conf_node::C_ALWAYS	1574	&& c->connectmode == conf_node::C_ALWAYS
1124	&& c->conf != THISNODE	1575	&& c->conf != THISNODE
1125	&& c->ictx && c->octx)	1576	&& c->ictx && c->octx)
1126	{	1577	{
1127	prio = c->conf->routerprio;	1578	prio = c->conf->routerprio;
1128	router = c;	1579	router = c;
…		…
1144	// if ((*i)->conf->routerprio)	1595	// if ((*i)->conf->routerprio)
1145	// (*i)->establish_connection ();	1596	// (*i)->establish_connection ();
1146	}	1597	}
1147		1598
1148	void	1599	void
1149	vpn::main_loop ()	1600	connection::dump_status ()
1150	{	1601	{
1151	struct pollfd pollfd[2];	1602	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
		1603	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
		1604	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
		1605	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
		1606	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
		1607	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
		1608	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
		1609	}
1152		1610
1153	pollfd[0].fd = tap->fd;	1611	void
1154	pollfd[0].events = POLLIN;	1612	vpn::dump_status ()
1155	pollfd[1].fd = socket_fd;	1613	{
1156	pollfd[1].events = POLLIN;	1614	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
1157		1615
1158	events = 0;
1159	now = time (0);
1160	next_timecheck = now + 1;
1161
1162	reconnect_all ();
1163
1164	for (;;)
1165	{
1166	int npoll = poll (pollfd, 2, (next_timecheck - now) * 1000);
1167
1168	now = time (0);
1169
1170	if (npoll > 0)
1171	{
1172	if (pollfd[1].revents)
1173	{
1174	if (pollfd[1].revents & (POLLIN | POLLERR))
1175	{
1176	vpn_packet *pkt = new vpn_packet;
1177	struct sockaddr_in sa;
1178	socklen_t sa_len = sizeof (sa);
1179	int len;
1180
1181	len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
1182
1183	if (len > 0)
1184	{
1185	pkt->len = len;
1186
1187	unsigned int src = pkt->src ();
1188	unsigned int dst = pkt->dst ();
1189
1190	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
1191	(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
1192
1193	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
1194	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
1195	pkt->typ (), pkt->src (), pkt->dst ());
1196	else if (dst == 0 && !THISNODE->routerprio)
1197	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
1198	else if (dst != 0 && dst != THISNODE->id)
1199	slog (L_WARN,
1200	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
1201	dst, conns[dst - 1]->conf->nodename,
1202	(const char *)sockinfo (sa),
1203	THISNODE->id, THISNODE->nodename);
1204	else if (src == 0 || src > conns.size ())
1205	slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa));
1206	else
1207	conns[src - 1]->recv_vpn_packet (pkt, &sa);
1208	}
1209	else
1210	{
1211	// probably ECONNRESET or somesuch
1212	slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno));
1213	}
1214
1215	delete pkt;
1216	}
1217	else if (pollfd[1].revents & POLLHUP)
1218	{
1219	// this cannot ;) happen on udp sockets
1220	slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating."));
1221	exit (1);
1222	}
1223	else
1224	{
1225	slog (L_ERR,
1226	_("FATAL: unknown revents %08x in socket, terminating\n"),
1227	pollfd[1].revents);
1228	exit (1);
1229	}
1230	}
1231
1232	// I use else here to give vpn_packets absolute priority
1233	else if (pollfd[0].revents)
1234	{
1235	if (pollfd[0].revents & POLLIN)
1236	{
1237	/* process data */
1238	tap_packet *pkt;
1239
1240	pkt = tap->recv ();
1241
1242	int dst = mac2id (pkt->dst);
1243	int src = mac2id (pkt->src);
1244
1245	if (src != THISNODE->id)
1246	{
1247	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
1248	exit (1);
1249	}
1250
1251	if (dst == THISNODE->id)
1252	{
1253	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
1254	exit (1);
1255	}
1256
1257	if (dst > conns.size ())
1258	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
1259	else
1260	{
1261	if (dst)
1262	{
1263	// unicast
1264	if (dst != THISNODE->id)
1265	conns[dst - 1]->inject_data_packet (pkt);
1266	}
1267	else
1268	{
1269	// broadcast, first check router, then self, then english
1270	connection *router = find_router ();
1271
1272	if (router)
1273	router->inject_data_packet (pkt, true);
1274	else
1275	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1616	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
1276	if ((*c)->conf != THISNODE)	1617	(*c)->dump_status ();
1277	(*c)->inject_data_packet (pkt);
1278	}
1279	}
1280		1618
1281	delete pkt;	1619	slog (L_NOTICE, _("END status dump"));
1282	}	1620	}
1283	else if (pollfd[0].revents & (POLLHUP | POLLERR))
1284	{
1285	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
1286	exit (1);
1287	}
1288	else
1289	abort ();
1290	}
1291	}
1292		1621
1293	if (events)	1622	vpn::vpn (void)
1294	{	1623	: udpv4_ev_watcher(this, &vpn::udpv4_ev)
1295	if (events & EVENT_SHUTDOWN)	1624	, ipv4_ev_watcher(this, &vpn::ipv4_ev)
1296	{	1625	, tap_ev_watcher(this, &vpn::tap_ev)
1297	shutdown_all ();	1626	, event(this, &vpn::event_cb)
1298		1627	{
1299	remove_pid (pidfilename);
1300
1301	slog (L_INFO, _("vped terminating"));
1302
1303	exit (0);
1304	}
1305
1306	if (events & EVENT_RECONNECT)
1307	reconnect_all ();
1308
1309	events = 0;
1310	}
1311
1312	// very very very dumb and crude and inefficient timer handling, or maybe not?
1313	if (now >= next_timecheck)
1314	{
1315	next_timecheck = now + TIMER_GRANULARITY;
1316
1317	for (conns_vector::iterator c = conns.begin ();
1318	c != conns.end (); ++c)
1319	(*c)->timer ();
1320	}
1321	}
1322	}	1628	}
1323		1629
1324	vpn::~vpn ()	1630	vpn::~vpn ()
1325	{}	1631	{
		1632	}
1326		1633

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