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Comparing gvpe/src/protocol.C (file contents):
Revision 1.8 by pcg, Mon Mar 17 15:20:18 2003 UTC vs.
Revision 1.23 by pcg, Fri Mar 28 05:40:54 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 time_t 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
		201	//////////////////////////////////////////////////////////////////////////////
		202
		203	void pkt_queue::put (tap_packet *p)
		204	{
		205	if (queue[i])
		206	{
		207	delete queue[i];
		208	j = (j + 1) % QUEUEDEPTH;
		209	}
		210
		211	queue[i] = p;
		212
		213	i = (i + 1) % QUEUEDEPTH;
		214	}
		215
		216	tap_packet *pkt_queue::get ()
		217	{
		218	tap_packet *p = queue[j];
		219
		220	if (p)
		221	{
		222	queue[j] = 0;
		223	j = (j + 1) % QUEUEDEPTH;
		224	}
		225
		226	return p;
		227	}
		228
		229	pkt_queue::pkt_queue ()
		230	{
		231	memset (queue, 0, sizeof (queue));
		232	i = 0;
		233	j = 0;
		234	}
		235
		236	pkt_queue::~pkt_queue ()
		237	{
		238	for (i = QUEUEDEPTH; --i > 0; )
		239	delete queue[i];
		240	}
		241
		242	struct net_rateinfo {
		243	u32 host;
		244	double pcnt, diff;
		245	tstamp last;
		246	};
		247
		248	// only do action once every x seconds per host whole allowing bursts.
		249	// this implementation ("splay list" ;) is inefficient,
		250	// but low on resources.
		251	struct net_rate_limiter : list<net_rateinfo>
		252	{
		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
		256
		257	bool can (const sockinfo &si) { return can((u32)si.host); }
		258	bool can (u32 host);
		259	};
		260
		261	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
		262
		263	bool net_rate_limiter::can (u32 host)
		264	{
		265	iterator i;
		266
		267	for (i = begin (); i != end (); )
		268	if (i->host == host)
		269	break;
		270	else if (i->last < NOW - EXPIRE)
		271	i = erase (i);
		272	else
		273	i++;
		274
		275	if (i == end ())
		276	{
		277	net_rateinfo ri;
		278
		279	ri.host = host;
		280	ri.pcnt = 1.;
		281	ri.diff = CUTOFF * (1. / (1. - ALPHA));
		282	ri.last = NOW;
		283
		284	push_front (ri);
		285
		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	}
		307	}
		308
135	/////////////////////////////////////////////////////////////////////////////	309	/////////////////////////////////////////////////////////////////////////////
136		310
137	static void next_wakeup (time_t next)	311	static void next_wakeup (time_t next)
138	{	312	{
139	if (next_timecheck > next)	313	if (next_timecheck > next)
…		…
141	}	315	}
142		316
143	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];	317	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
144		318
145	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)
146	{	328	{
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;	329	unsigned int xlen;
156	HMAC_CTX *hctx = &ctx->hctx;	330	HMAC_CTX *hctx = &ctx->hctx;
157		331
158	HMAC_Init_ex (hctx, 0, 0, 0, 0);	332	HMAC_Init_ex (hctx, 0, 0, 0, 0);
159	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	333	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
160	len - sizeof (hmac_packet));	334	len - sizeof (hmac_packet));
161	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	335	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
162	}
163	};	336	}
		337	};
164		338
165	void	339	void
166	hmac_packet::hmac_set (crypto_ctx * ctx)	340	hmac_packet::hmac_set (crypto_ctx * ctx)
167	{	341	{
168	hmac_gen (ctx);	342	hmac_gen (ctx);
…		…
184	{	358	{
185	PT_RESET = 0,	359	PT_RESET = 0,
186	PT_DATA_UNCOMPRESSED,	360	PT_DATA_UNCOMPRESSED,
187	PT_DATA_COMPRESSED,	361	PT_DATA_COMPRESSED,
188	PT_PING, PT_PONG, // wasting namespace space? ;)	362	PT_PING, PT_PONG, // wasting namespace space? ;)
189	PT_AUTH, // authentification	363	PT_AUTH_REQ, // authentification request
		364	PT_AUTH_RES, // authentification response
190	PT_CONNECT_REQ, // want other host to contact me	365	PT_CONNECT_REQ, // want other host to contact me
191	PT_CONNECT_INFO, // request connection to some node	366	PT_CONNECT_INFO, // request connection to some node
192	PT_REKEY, // rekeying (not yet implemented)
193	PT_MAX	367	PT_MAX
194	};	368	};
195		369
196	u8 type;	370	u8 type;
197	u8 srcdst, src1, dst1;	371	u8 srcdst, src1, dst1;
198		372
199	void set_hdr (ptype type, unsigned int dst);	373	void set_hdr (ptype type, unsigned int dst);
200		374
201	unsigned int src ()	375	unsigned int src () const
202	{	376	{
203	return src1 | ((srcdst >> 4) << 8);	377	return src1 | ((srcdst >> 4) << 8);
204	}	378	}
		379
205	unsigned int dst ()	380	unsigned int dst () const
206	{	381	{
207	return dst1 | ((srcdst & 0xf) << 8);	382	return dst1 | ((srcdst & 0xf) << 8);
208	}	383	}
		384
209	ptype typ ()	385	ptype typ () const
210	{	386	{
211	return (ptype) type;	387	return (ptype) type;
212	}	388	}
213	};	389	};
214		390
…		…
252	u32 cl;	428	u32 cl;
253		429
254	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	430	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
255	if (cl)	431	if (cl)
256	{	432	{
257	//printf ("compressed packet, %d => %d\n", l, cl);//D
258	type = PT_DATA_COMPRESSED;	433	type = PT_DATA_COMPRESSED;
259	d = cdata;	434	d = cdata;
260	l = cl + 2;	435	l = cl + 2;
261		436
262	d[0] = cl >> 8;	437	d[0] = cl >> 8;
…		…
264	}	439	}
265	#endif	440	#endif
266		441
267	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	442	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);
268		443
		444	struct {
269	#if RAND_SIZE	445	#if RAND_SIZE
270	struct {
271	u8 rnd[RAND_SIZE];	446	u8 rnd[RAND_SIZE];
		447	#endif
272	u32 seqno;	448	u32 seqno;
273	} datahdr;	449	} datahdr;
274		450
275	datahdr.seqno = seqno;	451	datahdr.seqno = ntohl (seqno);
		452	#if RAND_SIZE
276	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	453	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
		454	#endif
277		455
278	EVP_EncryptUpdate (cctx,	456	EVP_EncryptUpdate (cctx,
279	(unsigned char *) data + outl, &outl2,	457	(unsigned char *) data + outl, &outl2,
280	(unsigned char *) &datahdr, DATAHDR);	458	(unsigned char *) &datahdr, DATAHDR);
281	outl += outl2;	459	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		460
289	EVP_EncryptUpdate (cctx,	461	EVP_EncryptUpdate (cctx,
290	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
291	(unsigned char *) d, l);	463	(unsigned char *) d, l);
292	outl += outl2;	464	outl += outl2;
…		…
328	outl += outl2;	500	outl += outl2;
329		501
330	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	502	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);
331	outl += outl2;	503	outl += outl2;
332		504
333	seqno = *(u32 *)(d + RAND_SIZE);	505	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
334		506
335	id2mac (dst () ? dst() : THISNODE->id, p->dst);	507	id2mac (dst () ? dst() : THISNODE->id, p->dst);
336	id2mac (src (), p->src);	508	id2mac (src (), p->src);
337		509
338	#if ENABLE_COMPRESSION	510	#if ENABLE_COMPRESSION
339	if (type == PT_DATA_COMPRESSED)	511	if (type == PT_DATA_COMPRESSED)
340	{	512	{
341	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	513	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];
		514
342	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,
343	//printf ("decompressxed %d(%d) => %d\n", cl, len - data_hdr_size (), p->len);//D	516	&(*p)[6 + 6], MAX_MTU)
		517	+ 6 + 6;
344	}	518	}
345	else	519	else
346	p->len = outl + (6 + 6 - DATAHDR);	520	p->len = outl + (6 + 6 - DATAHDR);
347	#endif	521	#endif
348		522
349	return p;	523	return p;
350	}	524	}
351		525
352	struct ping_packet : vpn_packet	526	struct ping_packet : vpn_packet
		527	{
		528	void setup (int dst, ptype type)
353	{	529	{
354	void setup (int dst, ptype type)
355	{
356	set_hdr (type, dst);	530	set_hdr (type, dst);
357	len = sizeof (*this) - sizeof (net_packet);	531	len = sizeof (*this) - sizeof (net_packet);
358	}
359	};	532	}
		533	};
360		534
361	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
362	{	545	{
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	546	return 0x80
374	| (ENABLE_COMPRESSION ? 0x01 : 0x00)	547	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
375	| (ENABLE_TRUST ? 0x02 : 0x00);
376	}	548	}
377		549
378	void setup (ptype type, int dst)	550	void setup (ptype type, int dst);
379	{	551	bool chk_config () const;
		552	};
		553
		554	void config_packet::setup (ptype type, int dst)
		555	{
380	prot_major = PROTOCOL_MAJOR;	556	prot_major = PROTOCOL_MAJOR;
381	prot_minor = PROTOCOL_MINOR;	557	prot_minor = PROTOCOL_MINOR;
382	randsize = RAND_SIZE;	558	randsize = RAND_SIZE;
383	hmaclen = HMACLENGTH;	559	hmaclen = HMACLENGTH;
384	flags = curflags ();	560	flags = curflags ();
385	challengelen = sizeof (rsachallenge);	561	challengelen = sizeof (rsachallenge);
386		562
387	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	563	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
388	digest_nid = htonl (EVP_MD_type (DIGEST));	564	digest_nid = htonl (EVP_MD_type (RSA_HASH));
		565	hmac_nid = htonl (EVP_MD_type (DIGEST));
389		566
390	len = sizeof (*this) - sizeof (net_packet);	567	len = sizeof (*this) - sizeof (net_packet);
391	set_hdr (type, dst);	568	set_hdr (type, dst);
392	}	569	}
393		570
394	bool chk_config ()	571	bool config_packet::chk_config () const
395	{	572	{
396	return prot_major == PROTOCOL_MAJOR	573	return prot_major == PROTOCOL_MAJOR
397	&& randsize == RAND_SIZE	574	&& randsize == RAND_SIZE
398	&& hmaclen == HMACLENGTH	575	&& hmaclen == HMACLENGTH
399	&& flags == curflags ()	576	&& flags == curflags ()
400	&& challengelen == sizeof (rsachallenge)	577	&& challengelen == sizeof (rsachallenge)
401	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	578	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))
		579	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))
402	&& digest_nid == htonl (EVP_MD_type (DIGEST));	580	&& hmac_nid == htonl (EVP_MD_type (DIGEST));
403	}	581	}
404	};
405		582
406	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_)
407	{	592	{
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);	593	config_packet::setup (PT_AUTH_REQ, dst);
416	subtype = stype;	594	strncpy (magic, MAGIC, 8);
		595	initiate = !!initiate_;
		596	can_recv = can_recv_;
		597
417	len = sizeof (*this) - sizeof (net_packet);	598	len = sizeof (*this) - sizeof (net_packet);
418	strncpy (magic, MAGIC, 8);
419	}
420	};	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	};
421		616
422	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_)
423	{	623	{
424	u8 id;	624	id = 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);	625	set_hdr (PT_CONNECT_REQ, dst);
431	len = sizeof (*this) - sizeof (net_packet);	626	len = sizeof (*this) - sizeof (net_packet);
432	}
433	};	627	}
		628	};
434		629
435	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_)
436	{	637	{
437	u8 id;	638	id = id_;
438	u8 pad1, pad2, pad3;	639	can_recv = can_recv_;
439	sockinfo si;	640	si = 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);	641	set_hdr (PT_CONNECT_INFO, dst);
		642
446	len = sizeof (*this) - sizeof (net_packet);	643	len = sizeof (*this) - sizeof (net_packet);
447	}
448	};	644	}
		645	};
449		646
450	/////////////////////////////////////////////////////////////////////////////	647	/////////////////////////////////////////////////////////////////////////////
451		648
452	void	649	void
453	fill_sa (SOCKADDR *sa, conf_node *conf)	650	connection::reset_dstaddr ()
454	{	651	{
455	sa->sin_family = AF_INET;	652	si.set (conf);
456	sa->sin_port = htons (conf->port);	653	}
457	sa->sin_addr.s_addr = 0;
458		654
		655	void
		656	connection::send_ping (const sockinfo &si, u8 pong)
		657	{
		658	ping_packet *pkt = new ping_packet;
		659
		660	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		661	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		662
		663	delete pkt;
		664	}
		665
		666	void
		667	connection::send_reset (const sockinfo &si)
		668	{
		669	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		670	{
		671	config_packet *pkt = new config_packet;
		672
		673	pkt->setup (vpn_packet::PT_RESET, conf->id);
		674	send_vpn_packet (pkt, si, IPTOS_MINCOST);
		675
		676	delete pkt;
		677	}
		678	}
		679
		680	void
		681	connection::send_auth_request (const sockinfo &si, bool initiate)
		682	{
		683	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->can_recv);
		684
		685	// the next line is very conservative
		686	prot_send = best_protocol (THISNODE->can_send & THISNODE->can_recv & conf->can_recv);
		687
		688	rsachallenge chg;
		689
		690	rsa_cache.gen (pkt->id, chg);
		691
		692	if (0 > RSA_public_encrypt (sizeof chg,
		693	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
		694	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
		695	fatal ("RSA_public_encrypt error");
		696
		697	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
		698
		699	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		700
		701	delete pkt;
		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;
		720	}
		721
		722	void
		723	connection::establish_connection_cb (tstamp &ts)
		724	{
		725	if (ictx || conf == THISNODE
		726	|| connectmode == conf_node::C_NEVER
		727	|| connectmode == conf_node::C_DISABLED)
		728	ts = TSTAMP_CANCEL;
		729	else if (ts <= NOW)
		730	{
		731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
		732
		733	if (retry_int < 3600 * 8)
		734	retry_cnt++;
		735
		736	ts = NOW + retry_int;
		737
459	if (conf->hostname)	738	if (conf->hostname)
460	{	739	{
461	struct hostent *he = gethostbyname (conf->hostname);	740	reset_dstaddr ();
462		741	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	{	742	{
466	//sa->sin_family = he->h_addrtype;	743	if (retry_cnt < 4)
467	memcpy (&sa->sin_addr, he->h_addr_list[0], 4);	744	send_auth_request (si, true);
		745	else
		746	send_ping (si, 0);
		747	}
468	}	748	}
469	else	749	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, IPTOS_LOWDELAY);
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, IPTOS_MINCOST);
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, IPTOS_RELIABILITY);
556
557	delete pkt;
558	}
559	}
560
561	void
562	connection::establish_connection ()
563	{
564	if (!ictx && conf != THISNODE && 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 (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);	750	vpn->connect_request (conf->id);
591	}
592	}	751	}
593	}	752	}
594		753
595	void	754	void
596	connection::reset_connection ()	755	connection::reset_connection ()
597	{	756	{
598	if (ictx && octx)	757	if (ictx && octx)
599	{	758	{
600	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);
601		761
602	if (::conf.script_node_down)	762	if (::conf.script_node_down)
603	run_script (this, &connection::script_node_down, false);	763	run_script (run_script_cb (this, &connection::script_node_down), false);
604	}	764	}
605		765
606	delete ictx;	766	delete ictx; ictx = 0;
607	ictx = 0;	767	delete octx; octx = 0;
608		768
609	delete octx;	769	si.host= 0;
610	octx = 0;
611		770
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;	771	last_activity = 0;
		772	retry_cnt = 0;
		773
		774	rekey.reset ();
		775	keepalive.reset ();
		776	establish_connection.reset ();
618	}	777	}
619		778
620	void	779	void
621	connection::shutdown ()	780	connection::shutdown ()
622	{	781	{
623	if (ictx && octx)	782	if (ictx && octx)
624	send_reset (&sa);	783	send_reset (si);
625		784
626	reset_connection ();	785	reset_connection ();
627	}	786	}
628		787
629	void	788	void
630	connection::rekey ()	789	connection::rekey_cb (tstamp &ts)
631	{	790	{
		791	ts = TSTAMP_CANCEL;
		792
632	reset_connection ();	793	reset_connection ();
633	establish_connection ();	794	establish_connection ();
634	}	795	}
635		796
636	void	797	void
637	connection::send_data_packet (tap_packet * pkt, bool broadcast)	798	connection::send_data_packet (tap_packet *pkt, bool broadcast)
638	{	799	{
639	vpndata_packet *p = new vpndata_packet;	800	vpndata_packet *p = new vpndata_packet;
640	int tos = 0;	801	int tos = 0;
641		802
642	if (conf->inherit_tos	803	if (conf->inherit_tos
643	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	804	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
644	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4	805	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
645	tos = (*pkt)[15] & IPTOS_TOS_MASK;	806	tos = (*pkt)[15] & IPTOS_TOS_MASK;
646		807
647	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
648	vpn->send_vpn_packet (p, &sa, tos);	809	send_vpn_packet (p, si, tos);
649		810
650	delete p;	811	delete p;
651		812
652	if (oseqno > MAX_SEQNO)	813	if (oseqno > MAX_SEQNO)
653	rekey ();	814	rekey ();
…		…
666	establish_connection ();	827	establish_connection ();
667	}	828	}
668	}	829	}
669		830
670	void	831	void
671	connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa)	832	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
672	{	833	{
673	last_activity = now;	834	last_activity = NOW;
674		835
675	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",
676	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	837	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
677		838
678	switch (pkt->typ ())	839	switch (pkt->typ ())
679	{	840	{
680	case vpn_packet::PT_PING:	841	case vpn_packet::PT_PING:
		842	// we send pings instead of auth packets after some retries,
		843	// so reset the retry counter and establish a connection
		844	// when we receive a ping.
		845	if (!ictx)
		846	{
		847	if (auth_rate_limiter.can (rsi))
		848	send_auth_request (rsi, true);
		849	}
		850	else
681	send_ping (ssa, 1); // pong	851	send_ping (rsi, 1); // pong
		852
682	break;	853	break;
683		854
684	case vpn_packet::PT_PONG:	855	case vpn_packet::PT_PONG:
685	// we send pings instead of auth packets after some retries,
686	// so reset the retry counter and establish a conenction
687	// when we receive a pong.
688	if (!ictx && !octx)
689	{
690	retry_cnt = 0;
691	next_retry = 0;
692	establish_connection ();
693	}
694
695	break;	856	break;
696		857
697	case vpn_packet::PT_RESET:	858	case vpn_packet::PT_RESET:
698	{	859	{
699	reset_connection ();	860	reset_connection ();
700		861
701	config_packet *p = (config_packet *) pkt;	862	config_packet *p = (config_packet *) pkt;
		863
702	if (p->chk_config ())	864	if (!p->chk_config ())
		865	{
		866	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		867	conf->nodename, (const char *)rsi);
		868	connectmode = conf_node::C_DISABLED;
		869	}
703	if (connectmode == conf_node::C_ALWAYS)	870	else if (connectmode == conf_node::C_ALWAYS)
704	establish_connection ();	871	establish_connection ();
705
706	//D slog the protocol mismatch?
707	}	872	}
708	break;	873	break;
709		874
710	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:
711	{	927	{
712	auth_packet *p = (auth_packet *) pkt;	928	auth_res_packet *p = (auth_res_packet *) pkt;
713		929
714	slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype);	930	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
715		931
716	if (p->chk_config ()	932	if (p->chk_config ())
717	&& !strncmp (p->magic, MAGIC, 8))
718	{	933	{
719	if (p->prot_minor != PROTOCOL_MINOR)	934	if (p->prot_minor != PROTOCOL_MINOR)
720	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,
721	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	937	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
722		938
723	if (p->subtype == AUTH_INIT)
724	send_auth (AUTH_INITREPLY, ssa);
725
726	rsachallenge k;	939	rsachallenge chg;
727		940
728	#if ENABLE_TRUST	941	if (!rsa_cache.find (p->id, chg))
729	if (0 > RSA_private_decrypt (sizeof (rsaencrdata),	942	slog (L_ERR, _("%s(%s): unrequested auth response"),
730	(unsigned char *)&p->challenge, (unsigned char *)&k,	943	conf->nodename, (const char *)rsi);
731	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
732	// continued below
733	#else
734	rsaencrdata j;
735		944	else
736	if (0 > RSA_private_decrypt (sizeof (rsaencrdata),
737	(unsigned char *)&p->challenge, (unsigned char *)&j,
738	::conf.rsa_key, RSA_NO_PADDING))
739	fatal ("RSA_private_decrypt error");
740
741	if (0 > RSA_public_decrypt (sizeof (k),
742	(unsigned char *)&j, (unsigned char *)&k,
743	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
744	// continued below
745	#endif
746	{	945	{
747	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"),
748	conf->nodename, (const char *)sockinfo (ssa));	951	conf->nodename, (const char *)rsi);
749	break;	952	else
750	}
751
752	retry_cnt = 0;
753	next_retry = now + 8;
754
755	switch (p->subtype)
756	{
757	case AUTH_INIT:
758	case AUTH_INITREPLY:
759	delete ictx;
760	ictx = 0;
761
762	delete octx;
763
764	octx = new crypto_ctx (k, 1);
765	oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff;
766
767	send_auth (AUTH_REPLY, ssa, &k);
768	break;
769
770	case AUTH_REPLY:
771
772	if (!memcmp ((u8 *)gen_challenge (ssa) + sizeof (u32), (u8 *)&k + sizeof (u32),
773	sizeof (rsachallenge) - sizeof (u32)))
774	{	953	{
775	delete ictx;
776
777	ictx = new crypto_ctx (k, 0);
778	iseqno.reset (*(u32 *)&k[CHG_SEQNO] & 0x7fffffff); // at least 2**31 sequence numbers are valid
779
780	sa = *ssa;	954	rsaresponse h;
781		955
782	next_rekey = now + ::conf.rekey;	956	rsa_hash (p->id, chg, h);
783	next_wakeup (next_rekey);
784		957
785	// send queued packets	958	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
786	while (tap_packet *p = queue.get ())
787	{	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	{
788	send_data_packet (p);	974	send_data_packet (p);
789	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;
790	}	988	}
791		989	else
792	connectmode = conf->connectmode;	990	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
793
794	slog (L_INFO, _("connection to %d (%s %s) established"),
795	conf->id, conf->nodename, (const char *)sockinfo (ssa));	991	conf->nodename, (const char *)rsi);
796
797	if (::conf.script_node_up)
798	run_script (this, &connection::script_node_up, false);
799	}	992	}
		993
800	else	994	delete cctx;
801	slog (L_ERR, _("sent and received challenge do not match with (%s %s))"),
802	conf->nodename, (const char *)sockinfo (ssa));
803
804	break;
805	default:
806	slog (L_ERR, _("authentification illegal subtype error (%s %s)"),
807	conf->nodename, (const char *)sockinfo (ssa));
808	break;
809	}	995	}
810	}	996	}
811	else
812	send_reset (ssa);
813
814	break;
815	}	997	}
		998
		999	send_reset (rsi);
		1000	break;
816		1001
817	case vpn_packet::PT_DATA_COMPRESSED:	1002	case vpn_packet::PT_DATA_COMPRESSED:
818	#if !ENABLE_COMPRESSION	1003	#if !ENABLE_COMPRESSION
819	send_reset (ssa);	1004	send_reset (rsi);
820	break;	1005	break;
821	#endif	1006	#endif
		1007
822	case vpn_packet::PT_DATA_UNCOMPRESSED:	1008	case vpn_packet::PT_DATA_UNCOMPRESSED:
823		1009
824	if (ictx && octx)	1010	if (ictx && octx)
825	{	1011	{
826	vpndata_packet *p = (vpndata_packet *)pkt;	1012	vpndata_packet *p = (vpndata_packet *)pkt;
827		1013
828	if (*ssa == sa)	1014	if (rsi == si)
829	{	1015	{
830	if (!p->hmac_chk (ictx))	1016	if (!p->hmac_chk (ictx))
831	slog (L_ERR, _("hmac authentication error, received invalid packet\n"	1017	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
832	"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);
833	else	1020	else
834	{	1021	{
835	u32 seqno;	1022	u32 seqno;
836	tap_packet *d = p->unpack (this, seqno);	1023	tap_packet *d = p->unpack (this, seqno);
837		1024
…		…
853	break;	1040	break;
854	}	1041	}
855	}	1042	}
856	}	1043	}
857	else	1044	else
858	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);
859	}	1046	}
860		1047
861	send_reset (ssa);	1048	send_reset (rsi);
862	break;	1049	break;
863		1050
864	case vpn_packet::PT_CONNECT_REQ:	1051	case vpn_packet::PT_CONNECT_REQ:
865	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1052	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
866	{	1053	{
867	connect_req_packet *p = (connect_req_packet *) pkt;	1054	connect_req_packet *p = (connect_req_packet *) pkt;
868		1055
869	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
870		1057
…		…
876	if (c->ictx && c->octx)	1063	if (c->ictx && c->octx)
877	{	1064	{
878	// send connect_info packets to both sides, in case one is	1065	// send connect_info packets to both sides, in case one is
879	// behind a nat firewall (or both ;)	1066	// behind a nat firewall (or both ;)
880	{	1067	{
881	sockinfo si(sa);
882
883	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1068	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
884	c->conf->id, conf->id, (const char *)si);	1069	c->conf->id, conf->id, (const char *)si);
885		1070
886	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);
887		1072
888	r->hmac_set (c->octx);	1073	r->hmac_set (c->octx);
889	vpn->send_vpn_packet (r, &c->sa);	1074	send_vpn_packet (r, c->si);
890		1075
891	delete r;	1076	delete r;
892	}	1077	}
893		1078
894	{	1079	{
895	sockinfo si(c->sa);
896
897	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1080	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
898	conf->id, c->conf->id, (const char *)si);	1081	conf->id, c->conf->id, (const char *)c->si);
899		1082
900	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);
901		1084
902	r->hmac_set (octx);	1085	r->hmac_set (octx);
903	vpn->send_vpn_packet (r, &sa);	1086	send_vpn_packet (r, si);
904		1087
905	delete r;	1088	delete r;
906	}	1089	}
907	}	1090	}
908	}	1091	}
909		1092
910	break;	1093	break;
911		1094
912	case vpn_packet::PT_CONNECT_INFO:	1095	case vpn_packet::PT_CONNECT_INFO:
913	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1096	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
914	{	1097	{
915	connect_info_packet *p = (connect_info_packet *) pkt;	1098	connect_info_packet *p = (connect_info_packet *) pkt;
916		1099
917	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
918		1101
919	connection *c = vpn->conns[p->id - 1];	1102	connection *c = vpn->conns[p->id - 1];
920		1103
921	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1104	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
922	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);
923		1106
924	c->send_auth (AUTH_INIT, p->si.sa ());	1107	c->conf->can_recv = p->can_recv;
		1108	c->send_auth_request (p->si, true);
925	}	1109	}
		1110
926	break;	1111	break;
927		1112
928	default:	1113	default:
929	send_reset (ssa);	1114	send_reset (rsi);
930	break;	1115	break;
931	}
932	}
933		1116
934	void connection::timer ()
935	{
936	if (conf != THISNODE)
937	{	1117	}
938	if (now >= next_retry && connectmode == conf_node::C_ALWAYS)	1118	}
		1119
		1120	void connection::keepalive_cb (tstamp &ts)
		1121	{
		1122	if (NOW >= last_activity + ::conf.keepalive + 30)
		1123	{
		1124	reset_connection ();
939	establish_connection ();	1125	establish_connection ();
940		1126	}
941	if (ictx && octx)
942	{
943	if (now >= next_rekey)
944	rekey ();
945	else if (now >= last_activity + ::conf.keepalive + 30)
946	{
947	reset_connection ();
948	establish_connection ();
949	}
950	else if (now >= last_activity + ::conf.keepalive)	1127	else if (NOW < last_activity + ::conf.keepalive)
		1128	ts = last_activity + ::conf.keepalive;
951	if (conf->connectmode != conf_node::C_ONDEMAND	1129	else if (conf->connectmode != conf_node::C_ONDEMAND
952	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1130	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
		1131	{
953	send_ping (&sa);	1132	send_ping (si);
954	else	1133	ts = NOW + 5;
		1134	}
		1135	else
955	reset_connection ();	1136	reset_connection ();
956
957	}
958	}
959	}	1137	}
960		1138
961	void connection::connect_request (int id)	1139	void connection::connect_request (int id)
962	{	1140	{
963	connect_req_packet *p = new connect_req_packet (conf->id, id);	1141	connect_req_packet *p = new connect_req_packet (conf->id, id);
964		1142
965	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);	1143	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);
966	p->hmac_set (octx);	1144	p->hmac_set (octx);
967	vpn->send_vpn_packet (p, &sa);	1145	send_vpn_packet (p, si);
968		1146
969	delete p;	1147	delete p;
970	}	1148	}
971		1149
972	void connection::script_node ()	1150	void connection::script_node ()
973	{	1151	{
974	vpn->script_if_up ();	1152	vpn->script_if_up (0);
975		1153
976	char *env;	1154	char *env;
977	asprintf (&env, "DESTID=%d", conf->id);	1155	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
978	putenv (env);
979	asprintf (&env, "DESTNODE=%s", conf->nodename);	1156	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
980	putenv (env);	1157	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
981	asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr));
982	putenv (env);
983	asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port));	1158	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
984	putenv (env);
985	}	1159	}
986		1160
987	const char *connection::script_node_up ()	1161	const char *connection::script_node_up (int)
988	{	1162	{
989	script_node ();	1163	script_node ();
990		1164
991	putenv ("STATE=up");	1165	putenv ("STATE=up");
992		1166
993	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1167	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
994	}	1168	}
995		1169
996	const char *connection::script_node_down ()	1170	const char *connection::script_node_down (int)
997	{	1171	{
998	script_node ();	1172	script_node ();
999		1173
1000	putenv ("STATE=down");	1174	putenv ("STATE=down");
1001		1175
1002	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1176	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1003	}	1177	}
1004		1178
		1179	// send a vpn packet out to other hosts
		1180	void
		1181	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1182	{
		1183	if (prot_send & PROT_IPv4)
		1184	vpn->send_ipv4_packet (pkt, si, tos);
		1185	else
		1186	vpn->send_udpv4_packet (pkt, si, tos);
		1187	}
		1188
		1189	connection::connection(struct vpn *vpn_)
		1190	: vpn(vpn_)
		1191	, rekey (this, &connection::rekey_cb)
		1192	, keepalive (this, &connection::keepalive_cb)
		1193	, establish_connection (this, &connection::establish_connection_cb)
		1194	{
		1195	octx = ictx = 0;
		1196	retry_cnt = 0;
		1197
		1198	connectmode = conf_node::C_ALWAYS; // initial setting
		1199	reset_connection ();
		1200	}
		1201
		1202	connection::~connection ()
		1203	{
		1204	shutdown ();
		1205	}
		1206
1005	/////////////////////////////////////////////////////////////////////////////	1207	/////////////////////////////////////////////////////////////////////////////
1006		1208
1007	vpn::vpn (void)
1008	{}
1009
1010	const char *vpn::script_if_up ()	1209	const char *vpn::script_if_up (int)
1011	{	1210	{
1012	// the tunnel device mtu should be the physical mtu - overhead	1211	// the tunnel device mtu should be the physical mtu - overhead
1013	// the tricky part is rounding to the cipher key blocksize	1212	// the tricky part is rounding to the cipher key blocksize
1014	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD;	1213	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
1015	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	1214	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
1016	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	1215	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
1017	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	1216	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
1018		1217
1019	char *env;	1218	char *env;
…		…
1034		1233
1035	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	1234	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
1036	}	1235	}
1037		1236
1038	int	1237	int
1039	vpn::setup (void)	1238	vpn::setup ()
1040	{	1239	{
1041	struct sockaddr_in sa;	1240	u8 prots = 0;
1042		1241
		1242	for (configuration::node_vector::iterator i = conf.nodes.begin ();
		1243	i != conf.nodes.end (); ++i)
		1244	prots |= (*i)->can_send | (*i)->can_recv;
		1245
		1246	sockinfo si;
		1247
		1248	si.set (THISNODE);
		1249
		1250	udpv4_fd = -1;
		1251
		1252	if (prots & PROT_UDPv4)
		1253	{
1043	socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	1254	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
1044	if (socket_fd < 0)	1255
		1256	if (udpv4_fd < 0)
1045	return -1;	1257	return -1;
1046		1258
1047	fill_sa (&sa, THISNODE);	1259	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
1048		1260	{
1049	if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa)))
1050	{
1051	slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno));	1261	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
1052	exit (1);	1262	exit (1);
1053	}	1263	}
1054		1264
1055	#ifdef IP_MTU_DISCOVER	1265	#ifdef IP_MTU_DISCOVER
1056	// this I really consider a linux bug. I am neither connected	1266	// this I really consider a linux bug. I am neither connected
1057	// nor do I fragment myself. Linux still sets DF and doesn't	1267	// nor do I fragment myself. Linux still sets DF and doesn't
1058	// fragment for me sometimes.	1268	// fragment for me sometimes.
1059	{	1269	{
1060	int oval = IP_PMTUDISC_DONT;	1270	int oval = IP_PMTUDISC_DONT;
1061	setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	1271	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
1062	}	1272	}
1063	#endif	1273	#endif
1064	{	1274
		1275	// standard daemon practise...
		1276	{
1065	int oval = 1;	1277	int oval = 1;
1066	setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	1278	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		1279	}
		1280
		1281	udpv4_ev_watcher.start (udpv4_fd, POLLIN);
1067	}	1282	}
		1283
		1284	ipv4_fd = -1;
		1285	if (prots & PROT_IPv4)
		1286	{
		1287	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		1288
		1289	if (ipv4_fd < 0)
		1290	return -1;
		1291
		1292	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		1293	{
		1294	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
		1295	exit (1);
		1296	}
		1297
		1298	#ifdef IP_MTU_DISCOVER
		1299	// this I really consider a linux bug. I am neither connected
		1300	// nor do I fragment myself. Linux still sets DF and doesn't
		1301	// fragment for me sometimes.
		1302	{
		1303	int oval = IP_PMTUDISC_DONT;
		1304	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		1305	}
		1306	#endif
		1307
		1308	ipv4_ev_watcher.start (ipv4_fd, POLLIN);
		1309	}
1068		1310
1069	tap = new tap_device ();	1311	tap = new tap_device ();
1070	if (!tap) //D this, of course, never catches	1312	if (!tap) //D this, of course, never catches
1071	{	1313	{
1072	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	1314	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
1073	exit (1);	1315	exit (1);
1074	}	1316	}
1075		1317
1076	run_script (this, &vpn::script_if_up, true);	1318	run_script (run_script_cb (this, &vpn::script_if_up), true);
		1319
		1320	tap_ev_watcher.start (tap->fd, POLLIN);
		1321
		1322	reconnect_all ();
1077		1323
1078	return 0;	1324	return 0;
1079	}	1325	}
1080		1326
1081	void	1327	void
1082	vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos)	1328	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1083	{	1329	{
1084	setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	1330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
1085	sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa));	1331	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		1332	}
		1333
		1334	void
		1335	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1336	{
		1337	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		1338	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		1339	}
		1340
		1341	void
		1342	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
		1343	{
		1344	unsigned int src = pkt->src ();
		1345	unsigned int dst = pkt->dst ();
		1346
		1347	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
		1348	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
		1349
		1350	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
		1351	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
		1352	pkt->typ (), pkt->src (), pkt->dst ());
		1353	else if (dst == 0 && !THISNODE->routerprio)
		1354	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
		1355	else if (dst != 0 && dst != THISNODE->id)
		1356	slog (L_WARN,
		1357	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
		1358	dst, conns[dst - 1]->conf->nodename,
		1359	(const char *)rsi,
		1360	THISNODE->id, THISNODE->nodename);
		1361	else if (src == 0 || src > conns.size ())
		1362	slog (L_WARN, _("received frame from unknown node %d (%s)"),
		1363	src, (const char *)rsi);
		1364	else
		1365	conns[src - 1]->recv_vpn_packet (pkt, rsi);
		1366	}
		1367
		1368	void
		1369	vpn::udpv4_ev (short revents)
		1370	{
		1371	if (revents & (POLLIN | POLLERR))
		1372	{
		1373	vpn_packet *pkt = new vpn_packet;
		1374	struct sockaddr_in sa;
		1375	socklen_t sa_len = sizeof (sa);
		1376	int len;
		1377
		1378	len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1379
		1380	sockinfo si(sa);
		1381
		1382	if (len > 0)
		1383	{
		1384	pkt->len = len;
		1385
		1386	recv_vpn_packet (pkt, si);
		1387	}
		1388	else
		1389	{
		1390	// probably ECONNRESET or somesuch
		1391	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1392	}
		1393
		1394	delete pkt;
		1395	}
		1396	else if (revents & POLLHUP)
		1397	{
		1398	// this cannot ;) happen on udp sockets
		1399	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
		1400	exit (1);
		1401	}
		1402	else
		1403	{
		1404	slog (L_ERR,
		1405	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1406	revents);
		1407	exit (1);
		1408	}
		1409	}
		1410
		1411	void
		1412	vpn::ipv4_ev (short revents)
		1413	{
		1414	if (revents & (POLLIN | POLLERR))
		1415	{
		1416	vpn_packet *pkt = new vpn_packet;
		1417	struct sockaddr_in sa;
		1418	socklen_t sa_len = sizeof (sa);
		1419	int len;
		1420
		1421	len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1422
		1423	sockinfo si(sa, PROT_IPv4);
		1424
		1425	if (len > 0)
		1426	{
		1427	pkt->len = len;
		1428
		1429	// raw sockets deliver the ipv4, but don't expect it on sends
		1430	// this is slow, but...
		1431	pkt->skip_hdr (IP_OVERHEAD);
		1432
		1433	recv_vpn_packet (pkt, si);
		1434	}
		1435	else
		1436	{
		1437	// probably ECONNRESET or somesuch
		1438	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1439	}
		1440
		1441	delete pkt;
		1442	}
		1443	else if (revents & POLLHUP)
		1444	{
		1445	// this cannot ;) happen on udp sockets
		1446	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
		1447	exit (1);
		1448	}
		1449	else
		1450	{
		1451	slog (L_ERR,
		1452	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1453	revents);
		1454	exit (1);
		1455	}
		1456	}
		1457
		1458	void
		1459	vpn::tap_ev (short revents)
		1460	{
		1461	if (revents & POLLIN)
		1462	{
		1463	/* process data */
		1464	tap_packet *pkt;
		1465
		1466	pkt = tap->recv ();
		1467
		1468	int dst = mac2id (pkt->dst);
		1469	int src = mac2id (pkt->src);
		1470
		1471	if (src != THISNODE->id)
		1472	{
		1473	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
		1474	exit (1);
		1475	}
		1476
		1477	if (dst == THISNODE->id)
		1478	{
		1479	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
		1480	exit (1);
		1481	}
		1482
		1483	if (dst > conns.size ())
		1484	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
		1485	else
		1486	{
		1487	if (dst)
		1488	{
		1489	// unicast
		1490	if (dst != THISNODE->id)
		1491	conns[dst - 1]->inject_data_packet (pkt);
		1492	}
		1493	else
		1494	{
		1495	// broadcast, first check router, then self, then english
		1496	connection *router = find_router ();
		1497
		1498	if (router)
		1499	router->inject_data_packet (pkt, true);
		1500	else
		1501	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1502	if ((*c)->conf != THISNODE)
		1503	(*c)->inject_data_packet (pkt);
		1504	}
		1505	}
		1506
		1507	delete pkt;
		1508	}
		1509	else if (revents & (POLLHUP | POLLERR))
		1510	{
		1511	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
		1512	exit (1);
		1513	}
		1514	else
		1515	abort ();
		1516	}
		1517
		1518	void
		1519	vpn::event_cb (tstamp &ts)
		1520	{
		1521	if (events)
		1522	{
		1523	if (events & EVENT_SHUTDOWN)
		1524	{
		1525	slog (L_INFO, _("preparing shutdown..."));
		1526
		1527	shutdown_all ();
		1528
		1529	remove_pid (pidfilename);
		1530
		1531	slog (L_INFO, _("terminating"));
		1532
		1533	exit (0);
		1534	}
		1535
		1536	if (events & EVENT_RECONNECT)
		1537	{
		1538	slog (L_INFO, _("forced reconnect"));
		1539
		1540	reconnect_all ();
		1541	}
		1542
		1543	events = 0;
		1544	}
		1545
		1546	ts = TSTAMP_CANCEL;
1086	}	1547	}
1087		1548
1088	void	1549	void
1089	vpn::shutdown_all ()	1550	vpn::shutdown_all ()
1090	{	1551	{
…		…
1097	{	1558	{
1098	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1559	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
1099	delete *c;	1560	delete *c;
1100		1561
1101	conns.clear ();	1562	conns.clear ();
		1563
		1564	auth_rate_limiter.clear ();
		1565	reset_rate_limiter.clear ();
1102		1566
1103	for (configuration::node_vector::iterator i = conf.nodes.begin ();	1567	for (configuration::node_vector::iterator i = conf.nodes.begin ();
1104	i != conf.nodes.end (); ++i)	1568	i != conf.nodes.end (); ++i)
1105	{	1569	{
1106	connection *conn = new connection (this);	1570	connection *conn = new connection (this);
…		…
1146	// if ((*i)->conf->routerprio)	1610	// if ((*i)->conf->routerprio)
1147	// (*i)->establish_connection ();	1611	// (*i)->establish_connection ();
1148	}	1612	}
1149		1613
1150	void	1614	void
1151	vpn::main_loop ()	1615	connection::dump_status ()
1152	{	1616	{
1153	struct pollfd pollfd[2];	1617	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
		1618	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
		1619	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
		1620	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
		1621	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
		1622	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
		1623	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
		1624	}
1154		1625
1155	pollfd[0].fd = tap->fd;	1626	void
1156	pollfd[0].events = POLLIN;	1627	vpn::dump_status ()
1157	pollfd[1].fd = socket_fd;	1628	{
1158	pollfd[1].events = POLLIN;	1629	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
1159		1630
1160	events = 0;
1161	now = time (0);
1162	next_timecheck = now + 1;
1163
1164	reconnect_all ();
1165
1166	for (;;)
1167	{
1168	int npoll = poll (pollfd, 2, (next_timecheck - now) * 1000);
1169
1170	now = time (0);
1171
1172	if (npoll > 0)
1173	{
1174	if (pollfd[1].revents)
1175	{
1176	if (pollfd[1].revents & (POLLIN | POLLERR))
1177	{
1178	vpn_packet *pkt = new vpn_packet;
1179	struct sockaddr_in sa;
1180	socklen_t sa_len = sizeof (sa);
1181	int len;
1182
1183	len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
1184
1185	if (len > 0)
1186	{
1187	pkt->len = len;
1188
1189	unsigned int src = pkt->src ();
1190	unsigned int dst = pkt->dst ();
1191
1192	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
1193	(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
1194
1195	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
1196	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
1197	pkt->typ (), pkt->src (), pkt->dst ());
1198	else if (dst == 0 && !THISNODE->routerprio)
1199	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
1200	else if (dst != 0 && dst != THISNODE->id)
1201	slog (L_WARN,
1202	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
1203	dst, conns[dst - 1]->conf->nodename,
1204	(const char *)sockinfo (sa),
1205	THISNODE->id, THISNODE->nodename);
1206	else if (src == 0 || src > conns.size ())
1207	slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa));
1208	else
1209	conns[src - 1]->recv_vpn_packet (pkt, &sa);
1210	}
1211	else
1212	{
1213	// probably ECONNRESET or somesuch
1214	slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno));
1215	}
1216
1217	delete pkt;
1218	}
1219	else if (pollfd[1].revents & POLLHUP)
1220	{
1221	// this cannot ;) happen on udp sockets
1222	slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating."));
1223	exit (1);
1224	}
1225	else
1226	{
1227	slog (L_ERR,
1228	_("FATAL: unknown revents %08x in socket, terminating\n"),
1229	pollfd[1].revents);
1230	exit (1);
1231	}
1232	}
1233
1234	// I use else here to give vpn_packets absolute priority
1235	else if (pollfd[0].revents)
1236	{
1237	if (pollfd[0].revents & POLLIN)
1238	{
1239	/* process data */
1240	tap_packet *pkt;
1241
1242	pkt = tap->recv ();
1243
1244	int dst = mac2id (pkt->dst);
1245	int src = mac2id (pkt->src);
1246
1247	if (src != THISNODE->id)
1248	{
1249	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
1250	exit (1);
1251	}
1252
1253	if (dst == THISNODE->id)
1254	{
1255	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
1256	exit (1);
1257	}
1258
1259	if (dst > conns.size ())
1260	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
1261	else
1262	{
1263	if (dst)
1264	{
1265	// unicast
1266	if (dst != THISNODE->id)
1267	conns[dst - 1]->inject_data_packet (pkt);
1268	}
1269	else
1270	{
1271	// broadcast, first check router, then self, then english
1272	connection *router = find_router ();
1273
1274	if (router)
1275	router->inject_data_packet (pkt, true);
1276	else
1277	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1631	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
1278	if ((*c)->conf != THISNODE)	1632	(*c)->dump_status ();
1279	(*c)->inject_data_packet (pkt);
1280	}
1281	}
1282		1633
1283	delete pkt;	1634	slog (L_NOTICE, _("END status dump"));
1284	}	1635	}
1285	else if (pollfd[0].revents & (POLLHUP | POLLERR))
1286	{
1287	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
1288	exit (1);
1289	}
1290	else
1291	abort ();
1292	}
1293	}
1294		1636
1295	if (events)	1637	vpn::vpn (void)
1296	{	1638	: udpv4_ev_watcher(this, &vpn::udpv4_ev)
1297	if (events & EVENT_SHUTDOWN)	1639	, ipv4_ev_watcher(this, &vpn::ipv4_ev)
1298	{	1640	, tap_ev_watcher(this, &vpn::tap_ev)
1299	shutdown_all ();	1641	, event(this, &vpn::event_cb)
1300		1642	{
1301	remove_pid (pidfilename);
1302
1303	slog (L_INFO, _("vped terminating"));
1304
1305	exit (0);
1306	}
1307
1308	if (events & EVENT_RECONNECT)
1309	reconnect_all ();
1310
1311	events = 0;
1312	}
1313
1314	// very very very dumb and crude and inefficient timer handling, or maybe not?
1315	if (now >= next_timecheck)
1316	{
1317	next_timecheck = now + TIMER_GRANULARITY;
1318
1319	for (conns_vector::iterator c = conns.begin ();
1320	c != conns.end (); ++c)
1321	(*c)->timer ();
1322	}
1323	}
1324	}	1643	}
1325		1644
1326	vpn::~vpn ()	1645	vpn::~vpn ()
1327	{}	1646	{
		1647	}
1328		1648

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