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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 1.21 by pcg, Fri Mar 28 04:05:10 2003 UTC

…		…
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	17	*/
18		18
19	#include "config.h"	19	#include "config.h"
20		20
		21	#include <list>
		22
21	#include <cstdlib>	23	#include <cstdlib>
22	#include <cstring>	24	#include <cstring>
23	#include <cstdio>	25	#include <cstdio>
24		26
25	#include <sys/types.h>	27	#include <sys/types.h>
…		…
56		58
57	static time_t next_timecheck;	59	static time_t next_timecheck;
58		60
59	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	61	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
60		62
61	static const rsachallenge &	63	static u8
62	challenge_bytes ()	64	best_protocol (u8 protset)
63	{	65	{
64	static rsachallenge challenge;	66	if (protset & PROT_IPv4)
65	static 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);
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);	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;
		801	int tos = 0;
		802
		803	if (conf->inherit_tos
		804	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
		805	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
		806	tos = (*pkt)[15] & IPTOS_TOS_MASK;
640		807
641	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
642	vpn->send_vpn_packet (p, &sa);	809	send_vpn_packet (p, si, tos);
643		810
644	delete p;	811	delete p;
645		812
646	if (oseqno > MAX_SEQNO)	813	if (oseqno > MAX_SEQNO)
647	rekey ();	814	rekey ();
…		…
660	establish_connection ();	827	establish_connection ();
661	}	828	}
662	}	829	}
663		830
664	void	831	void
665	connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa)	832	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
666	{	833	{
667	last_activity = now;	834	last_activity = NOW;
668		835
669	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",
670	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	837	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
671		838
672	switch (pkt->typ ())	839	switch (pkt->typ ())
673	{	840	{
674	case vpn_packet::PT_PING:	841	case vpn_packet::PT_PING:
		842	// we send pings instead of auth packets after some retries,
		843	// so reset the retry counter and establish a connection
		844	// when we receive a ping.
		845	if (!ictx && !octx)
		846	{
		847	if (auth_rate_limiter.can (rsi))
		848	send_auth_request (rsi, true);
		849	}
		850	else
675	send_ping (ssa, 1); // pong	851	send_ping (rsi, 1); // pong
		852
676	break;	853	break;
677		854
678	case vpn_packet::PT_PONG:	855	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;	856	break;
690		857
691	case vpn_packet::PT_RESET:	858	case vpn_packet::PT_RESET:
692	{	859	{
693	reset_connection ();	860	reset_connection ();
694		861
695	config_packet *p = (config_packet *) pkt;	862	config_packet *p = (config_packet *) pkt;
		863
696	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	}
697	if (conf->connectmode == conf_node::C_ALWAYS)	870	else if (connectmode == conf_node::C_ALWAYS)
698	establish_connection ();	871	establish_connection ();
699
700	//D slog the protocol mismatch?
701	}	872	}
702	break;	873	break;
703		874
704	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:
705	{	927	{
706	auth_packet *p = (auth_packet *) pkt;	928	auth_res_packet *p = (auth_res_packet *) pkt;
707		929
708	slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype);	930	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
709		931
710	if (p->chk_config ()	932	if (p->chk_config ())
711	&& !strncmp (p->magic, MAGIC, 8))
712	{	933	{
713	if (p->prot_minor != PROTOCOL_MINOR)	934	if (p->prot_minor != PROTOCOL_MINOR)
714	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,
715	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	937	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
716		938
717	if (p->subtype == AUTH_INIT)
718	send_auth (AUTH_INITREPLY, ssa);
719
720	rsachallenge k;	939	rsachallenge chg;
721		940
722	#if ENABLE_TRUST	941	if (!rsa_cache.find (p->id, chg))
723	if (0 > RSA_private_decrypt (sizeof (rsaencrdata),	942	slog (L_ERR, _("%s(%s): unrequested auth response"),
724	(unsigned char *)&p->challenge, (unsigned char *)&k,	943	conf->nodename, (const char *)rsi);
725	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
726	// continued below
727	#else
728	rsaencrdata j;
729		944	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	{	945	{
741	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"),
742	conf->nodename, (const char *)sockinfo (ssa));	951	conf->nodename, (const char *)rsi);
743	break;	952	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	{	953	{
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;	954	rsaresponse h;
776		955
777	next_rekey = now + ::conf.rekey;	956	rsa_hash (p->id, chg, h);
778	next_wakeup (next_rekey);
779		957
780	// send queued packets	958	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
781	while (tap_packet *p = queue.get ())
782	{	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	{
783	send_data_packet (p);	974	send_data_packet (p);
784	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;
785	}	988	}
786		989	else
787	slog (L_INFO, _("connection to %d (%s %s) established"),	990	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
788	conf->id, conf->nodename, (const char *)sockinfo (ssa));	991	conf->nodename, (const char *)rsi);
789
790	if (::conf.script_node_up)
791	run_script (this, &connection::script_node_up, false);
792	}	992	}
		993
793	else	994	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	}	995	}
803	}	996	}
804	else
805	send_reset (ssa);
806
807	break;
808	}	997	}
		998
		999	send_reset (rsi);
		1000	break;
809		1001
810	case vpn_packet::PT_DATA_COMPRESSED:	1002	case vpn_packet::PT_DATA_COMPRESSED:
811	#if !ENABLE_COMPRESSION	1003	#if !ENABLE_COMPRESSION
812	send_reset (ssa);	1004	send_reset (rsi);
813	break;	1005	break;
814	#endif	1006	#endif
		1007
815	case vpn_packet::PT_DATA_UNCOMPRESSED:	1008	case vpn_packet::PT_DATA_UNCOMPRESSED:
816		1009
817	if (ictx && octx)	1010	if (ictx && octx)
818	{	1011	{
819	vpndata_packet *p = (vpndata_packet *)pkt;	1012	vpndata_packet *p = (vpndata_packet *)pkt;
820		1013
821	if (*ssa == sa)	1014	if (rsi == si)
822	{	1015	{
823	if (!p->hmac_chk (ictx))	1016	if (!p->hmac_chk (ictx))
824	slog (L_ERR, _("hmac authentication error, received invalid packet\n"	1017	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
825	"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);
826	else	1020	else
827	{	1021	{
828	u32 seqno;	1022	u32 seqno;
829	tap_packet *d = p->unpack (this, seqno);	1023	tap_packet *d = p->unpack (this, seqno);
830		1024
831	if (seqno <= iseqno - 32)	1025	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	{	1026	{
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);	1027	vpn->tap->send (d);
856		1028
857	if (p->dst () == 0) // re-broadcast	1029	if (p->dst () == 0) // re-broadcast
858	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1030	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
859	{	1031	{
860	connection *c = *i;	1032	connection *c = *i;
861		1033
862	if (c->conf != THISNODE && c->conf != conf)	1034	if (c->conf != THISNODE && c->conf != conf)
863	c->inject_data_packet (d);	1035	c->inject_data_packet (d);
864	}
865
866	delete d;
867
868	break;
869	}	1036	}
		1037
		1038	delete d;
		1039
		1040	break;
870	}	1041	}
871	}	1042	}
872	}	1043	}
873	else	1044	else
874	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);
875	}	1046	}
876		1047
877	send_reset (ssa);	1048	send_reset (rsi);
878	break;	1049	break;
879		1050
880	case vpn_packet::PT_CONNECT_REQ:	1051	case vpn_packet::PT_CONNECT_REQ:
881	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1052	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
882	{	1053	{
883	connect_req_packet *p = (connect_req_packet *) pkt;	1054	connect_req_packet *p = (connect_req_packet *) pkt;
884		1055
885	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
886		1057
…		…
889	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1060	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
890	conf->id, p->id, c->ictx && c->octx);	1061	conf->id, p->id, c->ictx && c->octx);
891		1062
892	if (c->ictx && c->octx)	1063	if (c->ictx && c->octx)
893	{	1064	{
894	sockinfo si(sa);	1065	// send connect_info packets to both sides, in case one is
		1066	// behind a nat firewall (or both ;)
895		1067	{
896	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	1068	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
897	c->conf->id, p->id, (const char *)si);	1069	c->conf->id, conf->id, (const char *)si);
898		1070
899	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);
900		1072
901	r->hmac_set (c->octx);	1073	r->hmac_set (c->octx);
902	vpn->send_vpn_packet (r, &c->sa);	1074	send_vpn_packet (r, c->si);
903		1075
904	delete r;	1076	delete r;
		1077	}
		1078
		1079	{
		1080	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
		1081	conf->id, c->conf->id, (const char *)c->si);
		1082
		1083	connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, c->si, c->conf->can_recv);
		1084
		1085	r->hmac_set (octx);
		1086	send_vpn_packet (r, si);
		1087
		1088	delete r;
		1089	}
905	}	1090	}
906	}	1091	}
907		1092
908	break;	1093	break;
909		1094
910	case vpn_packet::PT_CONNECT_INFO:	1095	case vpn_packet::PT_CONNECT_INFO:
911	if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx))	1096	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
912	{	1097	{
913	connect_info_packet *p = (connect_info_packet *) pkt;	1098	connect_info_packet *p = (connect_info_packet *) pkt;
914		1099
915	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
916		1101
917	connection *c = vpn->conns[p->id - 1];	1102	connection *c = vpn->conns[p->id - 1];
918		1103
919	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1104	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
920	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);
921		1106
922	c->send_auth (AUTH_INIT, p->si.sa ());	1107	c->conf->can_recv = p->can_recv;
		1108	c->send_auth_request (p->si, true);
923	}	1109	}
		1110
924	break;	1111	break;
925		1112
926	default:	1113	default:
927	send_reset (ssa);	1114	send_reset (rsi);
928	break;	1115	break;
929	}
930	}
931		1116
932	void connection::timer ()
933	{
934	if (conf != THISNODE)
935	{	1117	}
936	if (now >= next_retry && conf->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 ();
937	establish_connection ();	1125	establish_connection ();
938		1126	}
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)	1127	else if (NOW < last_activity + ::conf.keepalive)
		1128	ts = last_activity + ::conf.keepalive;
949	if (conf->connectmode != conf_node::C_ONDEMAND	1129	else if (conf->connectmode != conf_node::C_ONDEMAND
950	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1130	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
		1131	{
951	send_ping (&sa);	1132	send_ping (si);
952	else	1133	ts = NOW + 5;
		1134	}
		1135	else
953	reset_connection ();	1136	reset_connection ();
954		1137
955	}
956	}
957	}	1138	}
958		1139
959	void connection::connect_request (int id)	1140	void connection::connect_request (int id)
960	{	1141	{
961	connect_req_packet *p = new connect_req_packet (conf->id, id);	1142	connect_req_packet *p = new connect_req_packet (conf->id, id);
962		1143
963	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);	1144	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id);
964	p->hmac_set (octx);	1145	p->hmac_set (octx);
965	vpn->send_vpn_packet (p, &sa);	1146	send_vpn_packet (p, si);
966		1147
967	delete p;	1148	delete p;
968	}	1149	}
969		1150
970	void connection::script_node ()	1151	void connection::script_node ()
971	{	1152	{
972	vpn->script_if_up ();	1153	vpn->script_if_up (0);
973		1154
974	char *env;	1155	char *env;
975	asprintf (&env, "DESTID=%d", conf->id);	1156	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
976	putenv (env);
977	asprintf (&env, "DESTNODE=%s", conf->nodename);	1157	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
978	putenv (env);	1158	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));	1159	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
982	putenv (env);
983	}	1160	}
984		1161
985	const char *connection::script_node_up ()	1162	const char *connection::script_node_up (int)
986	{	1163	{
987	script_node ();	1164	script_node ();
988		1165
989	putenv ("STATE=up");	1166	putenv ("STATE=up");
990		1167
991	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1168	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
992	}	1169	}
993		1170
994	const char *connection::script_node_down ()	1171	const char *connection::script_node_down (int)
995	{	1172	{
996	script_node ();	1173	script_node ();
997		1174
998	putenv ("STATE=down");	1175	putenv ("STATE=down");
999		1176
1000	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1177	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1001	}	1178	}
1002		1179
		1180	// send a vpn packet out to other hosts
		1181	void
		1182	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1183	{
		1184	if (prot_send & PROT_IPv4)
		1185	vpn->send_ipv4_packet (pkt, si, tos);
		1186	else
		1187	vpn->send_udpv4_packet (pkt, si, tos);
		1188	}
		1189
		1190	connection::connection(struct vpn *vpn_)
		1191	: vpn(vpn_)
		1192	, rekey (this, &connection::rekey_cb)
		1193	, keepalive (this, &connection::keepalive_cb)
		1194	, establish_connection (this, &connection::establish_connection_cb)
		1195	{
		1196	octx = ictx = 0;
		1197	retry_cnt = 0;
		1198
		1199	connectmode = conf_node::C_ALWAYS; // initial setting
		1200	reset_connection ();
		1201	}
		1202
		1203	connection::~connection ()
		1204	{
		1205	shutdown ();
		1206	}
		1207
1003	/////////////////////////////////////////////////////////////////////////////	1208	/////////////////////////////////////////////////////////////////////////////
1004		1209
1005	vpn::vpn (void)
1006	{}
1007
1008	const char *vpn::script_if_up ()	1210	const char *vpn::script_if_up (int)
1009	{	1211	{
1010	// the tunnel device mtu should be the physical mtu - overhead	1212	// the tunnel device mtu should be the physical mtu - overhead
1011	// the tricky part is rounding to the cipher key blocksize	1213	// the tricky part is rounding to the cipher key blocksize
1012	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD;	1214	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
1013	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	1215	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
1014	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	1216	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
1015	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	1217	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
1016		1218
1017	char *env;	1219	char *env;
…		…
1032		1234
1033	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	1235	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
1034	}	1236	}
1035		1237
1036	int	1238	int
1037	vpn::setup (void)	1239	vpn::setup ()
1038	{	1240	{
1039	struct sockaddr_in sa;	1241	u8 prots = 0;
1040		1242
		1243	for (configuration::node_vector::iterator i = conf.nodes.begin ();
		1244	i != conf.nodes.end (); ++i)
		1245	prots |= (*i)->can_send | (*i)->can_recv;
		1246
		1247	sockinfo si;
		1248
		1249	si.set (THISNODE);
		1250
		1251	udpv4_fd = -1;
		1252
		1253	if (prots & PROT_UDPv4)
		1254	{
1041	socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	1255	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
1042	if (socket_fd < 0)	1256
		1257	if (udpv4_fd < 0)
1043	return -1;	1258	return -1;
1044		1259
1045	fill_sa (&sa, THISNODE);	1260	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
1046		1261	{
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));	1262	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));
1050	exit (1);	1263	exit (1);
1051	}	1264	}
1052		1265
1053	#ifdef IP_MTU_DISCOVER	1266	#ifdef IP_MTU_DISCOVER
1054	// this I really consider a linux bug. I am neither connected	1267	// this I really consider a linux bug. I am neither connected
1055	// nor do I fragment myself. Linux still sets DF and doesn't	1268	// nor do I fragment myself. Linux still sets DF and doesn't
1056	// fragment for me sometimes.	1269	// fragment for me sometimes.
1057	{	1270	{
1058	int oval = IP_PMTUDISC_DONT;	1271	int oval = IP_PMTUDISC_DONT;
1059	setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	1272	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
1060	}	1273	}
1061	#endif	1274	#endif
1062	{	1275
		1276	// standard daemon practise...
		1277	{
1063	int oval = 1;	1278	int oval = 1;
1064	setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	1279	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		1280	}
		1281
		1282	udpv4_ev_watcher.start (udpv4_fd, POLLIN);
1065	}	1283	}
		1284
		1285	ipv4_fd = -1;
		1286	if (prots & PROT_IPv4)
		1287	{
		1288	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		1289
		1290	if (ipv4_fd < 0)
		1291	return -1;
		1292
		1293	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		1294	{
		1295	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
		1296	exit (1);
		1297	}
		1298
		1299	#ifdef IP_MTU_DISCOVER
		1300	// this I really consider a linux bug. I am neither connected
		1301	// nor do I fragment myself. Linux still sets DF and doesn't
		1302	// fragment for me sometimes.
		1303	{
		1304	int oval = IP_PMTUDISC_DONT;
		1305	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		1306	}
		1307	#endif
		1308
		1309	ipv4_ev_watcher.start (ipv4_fd, POLLIN);
		1310	}
1066		1311
1067	tap = new tap_device ();	1312	tap = new tap_device ();
1068	if (!tap) //D this, of course, never catches	1313	if (!tap) //D this, of course, never catches
1069	{	1314	{
1070	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	1315	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
1071	exit (1);	1316	exit (1);
1072	}	1317	}
1073		1318
1074	run_script (this, &vpn::script_if_up, true);	1319	run_script (run_script_cb (this, &vpn::script_if_up), true);
		1320
		1321	tap_ev_watcher.start (tap->fd, POLLIN);
		1322
		1323	reconnect_all ();
1075		1324
1076	return 0;	1325	return 0;
1077	}	1326	}
1078		1327
1079	void	1328	void
1080	vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa)	1329	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1081	{	1330	{
1082	sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa));	1331	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		1332	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		1333	}
		1334
		1335	void
		1336	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		1337	{
		1338	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		1339	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		1340	}
		1341
		1342	void
		1343	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
		1344	{
		1345	unsigned int src = pkt->src ();
		1346	unsigned int dst = pkt->dst ();
		1347
		1348	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
		1349	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
		1350
		1351	if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX)
		1352	slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"),
		1353	pkt->typ (), pkt->src (), pkt->dst ());
		1354	else if (dst == 0 && !THISNODE->routerprio)
		1355	slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst);
		1356	else if (dst != 0 && dst != THISNODE->id)
		1357	slog (L_WARN,
		1358	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),
		1359	dst, conns[dst - 1]->conf->nodename,
		1360	(const char *)rsi,
		1361	THISNODE->id, THISNODE->nodename);
		1362	else if (src == 0 || src > conns.size ())
		1363	slog (L_WARN, _("received frame from unknown node %d (%s)"),
		1364	src, (const char *)rsi);
		1365	else
		1366	conns[src - 1]->recv_vpn_packet (pkt, rsi);
		1367	}
		1368
		1369	void
		1370	vpn::udpv4_ev (short revents)
		1371	{
		1372	if (revents & (POLLIN | POLLERR))
		1373	{
		1374	vpn_packet *pkt = new vpn_packet;
		1375	struct sockaddr_in sa;
		1376	socklen_t sa_len = sizeof (sa);
		1377	int len;
		1378
		1379	len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1380
		1381	sockinfo si(sa);
		1382
		1383	if (len > 0)
		1384	{
		1385	pkt->len = len;
		1386
		1387	recv_vpn_packet (pkt, si);
		1388	}
		1389	else
		1390	{
		1391	// probably ECONNRESET or somesuch
		1392	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1393	}
		1394
		1395	delete pkt;
		1396	}
		1397	else if (revents & POLLHUP)
		1398	{
		1399	// this cannot ;) happen on udp sockets
		1400	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
		1401	exit (1);
		1402	}
		1403	else
		1404	{
		1405	slog (L_ERR,
		1406	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1407	revents);
		1408	exit (1);
		1409	}
		1410	}
		1411
		1412	void
		1413	vpn::ipv4_ev (short revents)
		1414	{
		1415	if (revents & (POLLIN | POLLERR))
		1416	{
		1417	vpn_packet *pkt = new vpn_packet;
		1418	struct sockaddr_in sa;
		1419	socklen_t sa_len = sizeof (sa);
		1420	int len;
		1421
		1422	len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
		1423
		1424	sockinfo si(sa, PROT_IPv4);
		1425
		1426	if (len > 0)
		1427	{
		1428	pkt->len = len;
		1429
		1430	// raw sockets deliver the ipv4, but don't expect it on sends
		1431	// this is slow, but...
		1432	pkt->skip_hdr (IP_OVERHEAD);
		1433
		1434	recv_vpn_packet (pkt, si);
		1435	}
		1436	else
		1437	{
		1438	// probably ECONNRESET or somesuch
		1439	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
		1440	}
		1441
		1442	delete pkt;
		1443	}
		1444	else if (revents & POLLHUP)
		1445	{
		1446	// this cannot ;) happen on udp sockets
		1447	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
		1448	exit (1);
		1449	}
		1450	else
		1451	{
		1452	slog (L_ERR,
		1453	_("FATAL: unknown revents %08x in socket, terminating\n"),
		1454	revents);
		1455	exit (1);
		1456	}
		1457	}
		1458
		1459	void
		1460	vpn::tap_ev (short revents)
		1461	{
		1462	if (revents & POLLIN)
		1463	{
		1464	/* process data */
		1465	tap_packet *pkt;
		1466
		1467	pkt = tap->recv ();
		1468
		1469	int dst = mac2id (pkt->dst);
		1470	int src = mac2id (pkt->src);
		1471
		1472	if (src != THISNODE->id)
		1473	{
		1474	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
		1475	exit (1);
		1476	}
		1477
		1478	if (dst == THISNODE->id)
		1479	{
		1480	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
		1481	exit (1);
		1482	}
		1483
		1484	if (dst > conns.size ())
		1485	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
		1486	else
		1487	{
		1488	if (dst)
		1489	{
		1490	// unicast
		1491	if (dst != THISNODE->id)
		1492	conns[dst - 1]->inject_data_packet (pkt);
		1493	}
		1494	else
		1495	{
		1496	// broadcast, first check router, then self, then english
		1497	connection *router = find_router ();
		1498
		1499	if (router)
		1500	router->inject_data_packet (pkt, true);
		1501	else
		1502	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		1503	if ((*c)->conf != THISNODE)
		1504	(*c)->inject_data_packet (pkt);
		1505	}
		1506	}
		1507
		1508	delete pkt;
		1509	}
		1510	else if (revents & (POLLHUP | POLLERR))
		1511	{
		1512	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
		1513	exit (1);
		1514	}
		1515	else
		1516	abort ();
		1517	}
		1518
		1519	void
		1520	vpn::event_cb (tstamp &ts)
		1521	{
		1522	if (events)
		1523	{
		1524	if (events & EVENT_SHUTDOWN)
		1525	{
		1526	slog (L_INFO, _("preparing shutdown..."));
		1527
		1528	shutdown_all ();
		1529
		1530	remove_pid (pidfilename);
		1531
		1532	slog (L_INFO, _("terminating"));
		1533
		1534	exit (0);
		1535	}
		1536
		1537	if (events & EVENT_RECONNECT)
		1538	{
		1539	slog (L_INFO, _("forced reconnect"));
		1540
		1541	reconnect_all ();
		1542	}
		1543
		1544	events = 0;
		1545	}
		1546
		1547	ts = TSTAMP_CANCEL;
1083	}	1548	}
1084		1549
1085	void	1550	void
1086	vpn::shutdown_all ()	1551	vpn::shutdown_all ()
1087	{	1552	{
…		…
1095	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	1560	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
1096	delete *c;	1561	delete *c;
1097		1562
1098	conns.clear ();	1563	conns.clear ();
1099		1564
		1565	auth_rate_limiter.clear ();
		1566	reset_rate_limiter.clear ();
		1567
1100	for (configuration::node_vector::iterator i = conf.nodes.begin ();	1568	for (configuration::node_vector::iterator i = conf.nodes.begin ();
1101	i != conf.nodes.end (); ++i)	1569	i != conf.nodes.end (); ++i)
1102	{	1570	{
1103	connection *conn = new connection (this);	1571	connection *conn = new connection (this);
1104		1572
1105	conn->conf = *i;	1573	conn->conf = *i;
1106	conns.push_back (conn);	1574	conns.push_back (conn);
1107		1575
1108	if (conn->conf->connectmode == conf_node::C_ALWAYS)
1109	conn->establish_connection ();	1576	conn->establish_connection ();
1110	}	1577	}
1111	}	1578	}
1112		1579
1113	connection *vpn::find_router ()	1580	connection *vpn::find_router ()
1114	{	1581	{
…		…
1118	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	1585	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
1119	{	1586	{
1120	connection *c = *i;	1587	connection *c = *i;
1121		1588
1122	if (c->conf->routerprio > prio	1589	if (c->conf->routerprio > prio
1123	&& c->conf->connectmode == conf_node::C_ALWAYS	1590	&& c->connectmode == conf_node::C_ALWAYS
1124	&& c->conf != THISNODE	1591	&& c->conf != THISNODE
1125	&& c->ictx && c->octx)	1592	&& c->ictx && c->octx)
1126	{	1593	{
1127	prio = c->conf->routerprio;	1594	prio = c->conf->routerprio;
1128	router = c;	1595	router = c;
…		…
1144	// if ((*i)->conf->routerprio)	1611	// if ((*i)->conf->routerprio)
1145	// (*i)->establish_connection ();	1612	// (*i)->establish_connection ();
1146	}	1613	}
1147		1614
1148	void	1615	void
1149	vpn::main_loop ()	1616	connection::dump_status ()
1150	{	1617	{
1151	struct pollfd pollfd[2];	1618	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
		1619	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
		1620	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
		1621	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
		1622	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
		1623	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
		1624	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
		1625	}
1152		1626
1153	pollfd[0].fd = tap->fd;	1627	void
1154	pollfd[0].events = POLLIN;	1628	vpn::dump_status ()
1155	pollfd[1].fd = socket_fd;	1629	{
1156	pollfd[1].events = POLLIN;	1630	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
1157		1631
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)	1632	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
1276	if ((*c)->conf != THISNODE)	1633	(*c)->dump_status ();
1277	(*c)->inject_data_packet (pkt);
1278	}
1279	}
1280		1634
1281	delete pkt;	1635	slog (L_NOTICE, _("END status dump"));
1282	}	1636	}
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		1637
1293	if (events)	1638	vpn::vpn (void)
1294	{	1639	: udpv4_ev_watcher(this, &vpn::udpv4_ev)
1295	if (events & EVENT_SHUTDOWN)	1640	, ipv4_ev_watcher(this, &vpn::ipv4_ev)
1296	{	1641	, tap_ev_watcher(this, &vpn::tap_ev)
1297	shutdown_all ();	1642	, event(this, &vpn::event_cb)
1298		1643	{
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	}	1644	}
1323		1645
1324	vpn::~vpn ()	1646	vpn::~vpn ()
1325	{}	1647	{
		1648	}
1326		1649

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