[ViewVC] Diff of: cvs/gvpe/src/vpn.C

Comparing gvpe/src/vpn.C (file contents):
Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs.
Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
3		4
4	This program is free software; you can redistribute it and/or modify	5	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	6	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	7	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	8	(at your option) any later version.
18		19
19	#include "config.h"	20	#include "config.h"
20		21
21	#include <list>	22	#include <list>
22		23
		24	#include <cstdio>
		25	#include <cstring>
23	#include <cstdlib>	26	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		27
27	#include <sys/types.h>	28	#include <sys/types.h>
28	#include <sys/socket.h>	29	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	30	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	31	#include <errno.h>
34	#include <time.h>	32	#include <time.h>
35	#include <unistd.h>	33	#include <unistd.h>
		34	#include <fcntl.h>
		35	#include <sys/socket.h>
		36
		37	#include "netcompat.h"
36		38
37	#include "pidfile.h"	39	#include "pidfile.h"
38		40
39	#include "connection.h"	41	#include "connection.h"
40	#include "util.h"	42	#include "util.h"
41	#include "vpn.h"	43	#include "vpn.h"
42		44
43	#if ENABLE_TCP	45	vpn network; // THE vpn (bad design...)
44	# include <map>
45	# include <unistd.h>
46	# include <fcntl.h>
47	# include <sys/poll.h>
48	#endif
49		46
50	/////////////////////////////////////////////////////////////////////////////	47	/////////////////////////////////////////////////////////////////////////////
51		48
52	const char *vpn::script_if_up ()	49	const char *vpn::script_if_up ()
53	{	50	{
…		…
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		57
61	char *env;	58	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);	61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	65	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);	68	THISNODE->id & 0xff);
75	putenv (env);	69	putenv (env);
76		70
…		…
78	}	72	}
79		73
80	int	74	int
81	vpn::setup ()	75	vpn::setup ()
82	{	76	{
		77	ipv4_fd = -1;
		78
		79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		80	{
		81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		82
		83	if (ipv4_fd < 0)
		84	return -1;
		85
		86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		87
		88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		89	// this I really consider a linux bug. I am neither connected
		90	// nor do I fragment myself. Linux still sets DF and doesn't
		91	// fragment for me sometimes.
		92	{
		93	int oval = IP_PMTUDISC_DONT;
		94	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		95	}
		96	#endif
		97
		98	sockinfo si (THISNODE, PROT_IPv4);
		99
		100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		101	{
		102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		103	exit (EXIT_FAILURE);
		104	}
		105
		106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		107	}
		108
83	udpv4_fd = -1;	109	udpv4_fd = -1;
84		110
85	if (THISNODE->protocols & PROT_UDPv4)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	112	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		114
89	if (udpv4_fd < 0)	115	if (udpv4_fd < 0)
90	return -1;	116	return -1;
		117
		118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
91		119
92	// standard daemon practise...	120	// standard daemon practise...
93	{	121	{
94	int oval = 1;	122	int oval = 1;
95	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96	}	124	}
97		125
98	sockinfo si (THISNODE, PROT_UDPv4);	126	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
99
100	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
101	{
102	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
103	exit (1);
104	}
105
106	#ifdef IP_MTU_DISCOVER
107	// this I really consider a linux bug. I am neither connected	127	// this I really consider a linux bug. I am neither connected
108	// nor do I fragment myself. Linux still sets DF and doesn't	128	// nor do I fragment myself. Linux still sets DF and doesn't
109	// fragment for me sometimes.	129	// fragment for me sometimes.
110	{	130	{
111	int oval = IP_PMTUDISC_DONT;	131	int oval = IP_PMTUDISC_DONT;
112	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	132	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113	}	133	}
114	#endif	134	#endif
115		135
		136	sockinfo si (THISNODE, PROT_UDPv4);
		137
		138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		139	{
		140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		141	exit (EXIT_FAILURE);
		142	}
		143
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
117	}	145	}
118		146
119	ipv4_fd = -1;	147	icmpv4_fd = -1;
		148
		149	#if ENABLE_ICMP
120	if (THISNODE->protocols & PROT_IPv4)	150	if (THISNODE->protocols & PROT_ICMPv4)
121	{	151	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123		153
124	if (ipv4_fd < 0)	154	if (icmpv4_fd < 0)
125	return -1;	155	return -1;
126		156
127	sockinfo si (THISNODE, PROT_IPv4);	157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
128		158
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	159	#ifdef ICMP_FILTER
130	{	160	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	161	icmp_filter oval;
132	exit (1);	162	oval.data = 0xffffffff;
		163	if (::conf.icmp_type < 32)
		164	oval.data &= ~(1 << ::conf.icmp_type);
		165
		166	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133	}	167	}
		168	#endif
134		169
135	#ifdef IP_MTU_DISCOVER	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
137	// nor do I fragment myself. Linux still sets DF and doesn't	172	// nor do I fragment myself. Linux still sets DF and doesn't
138	// fragment for me sometimes.	173	// fragment for me sometimes.
139	{	174	{
140	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	177	}
143	#endif	178	#endif
144		179
		180	sockinfo si (THISNODE, PROT_ICMPv4);
		181
		182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		183	{
		184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		185	exit (EXIT_FAILURE);
		186	}
		187
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	189	}
		190	#endif
		191
		192	tcpv4_fd = -1;
147		193
148	#if ENABLE_TCP	194	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	196	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		198
153	if (tcpv4_fd < 0)	199	if (tcpv4_fd < 0)
154	return -1;	200	return -1;
		201
		202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
155		203
156	// standard daemon practise...	204	// standard daemon practise...
157	{	205	{
158	int oval = 1;	206	int oval = 1;
159	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
162	sockinfo si (THISNODE, PROT_TCPv4);	210	sockinfo si (THISNODE, PROT_TCPv4);
163		211
164	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
165	{	213	{
166	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);	215	exit (EXIT_FAILURE);
168	}	216	}
169		217
170	if (listen (tcpv4_fd, 5))	218	if (listen (tcpv4_fd, 5))
171	{	219	{
172	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
173	exit (1);	221	exit (EXIT_FAILURE);
		222	}
		223
		224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		225	}
		226	#endif
		227
		228	#if ENABLE_DNS
		229	if (THISNODE->protocols & PROT_DNSv4)
		230	{
		231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		232
		233	if (dnsv4_fd < 0)
		234	return -1;
		235
		236	// standard daemon practise...
		237	{
		238	int oval = 1;
		239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		240	}
		241
		242	sockinfo si (THISNODE, PROT_DNSv4);
		243
		244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
174	}	245	{
		246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
175		249
176	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
177	}	251	}
178	#endif	252	#endif
179		253
180	tap = new tap_device ();	254	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
182	{	256	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	258	exit (EXIT_FAILURE);
185	}	259	}
186		260
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
188		262
189	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
190		264
191	reconnect_all ();	265	reconnect_all ();
192		266
193	return 0;	267	return 0;
194	}	268	}
195		269
196	void	270	bool
197	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	271	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198	{	272	{
		273	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	274	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		275	#endif
200	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	276	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201	}
202		277
203	void	278	return true;
		279	}
		280
		281	static u16
		282	ipv4_checksum (u16 *data, unsigned int len)
		283	{
		284	// use 32 bit accumulator and fold back carry bits at the end
		285	u32 sum = 0;
		286
		287	while (len > 1)
		288	{
		289	sum += *data++;
		290	len -= 2;
		291	}
		292
		293	// odd byte left?
		294	if (len)
		295	sum += (u8 )data;
		296
		297	// add back carry bits
		298	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		299	sum += (sum >> 16); // carry
		300
		301	return ~sum;
		302	}
		303
		304	#if ENABLE_ICMP
		305	bool
		306	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		307	{
		308	#if defined(SOL_IP) && defined(IP_TOS)
		309	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		310	#endif
		311
		312	pkt->unshift_hdr (4);
		313
		314	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		315	hdr->type = ::conf.icmp_type;
		316	hdr->code = 255;
		317	hdr->checksum = 0;
		318	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		319
		320	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		321
		322	return true;
		323	}
		324	#endif
		325
		326	bool
204	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	327	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
207	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	332	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		333
		334	return true;
		335	}
		336
		337	void
		338	vpn::inject_data_packet (tap_packet *pkt, int dst)
		339	{
		340	if (dst)
		341	{
		342	// unicast
		343	if (dst != THISNODE->id)
		344	conns[dst - 1]->inject_data_packet (pkt);
		345	}
		346	else
		347	{
		348	// broadcast, this is ugly, but due to the security policy
		349	// we have to connect to all hosts...
		350	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		351	if ((*c)->conf != THISNODE)
		352	(*c)->inject_data_packet (pkt, true);
		353	}
208	}	354	}
209		355
210	void	356	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	357	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	358	{
…		…
219	if (src == 0 \|\| src > conns.size ()	365	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	366	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	367	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	368	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	369	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		370	else if (dst > conns.size ())
		371	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		372	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224	else	373	else
225	{	374	{
226	connection *c = conns[src - 1];	375	connection *c = conns[src - 1];
227		376
228	if (dst == 0 && !THISNODE->routerprio)	377	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	378	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	379	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	380	else if (dst != THISNODE->id)
232	// FORWARDING NEEDED ;)	381	{
		382	if (THISNODE->routerprio)
		383	// the tos setting gets lost here. who cares.
		384	conns[dst - 1]->inject_vpn_packet (pkt);
		385	else
233	slog (L_WARN,	386	slog (L_WARN,
234	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	387	_("%s(%s): forwarding request (=> %s), but we are no router"),
		388	c->conf->nodename, (const char *)rsi,
235	dst, conns[dst - 1]->conf->nodename,	389	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	390	}
237	THISNODE->id, THISNODE->nodename);
238	else	391	else
239	c->recv_vpn_packet (pkt, rsi);	392	c->recv_vpn_packet (pkt, rsi);
240	}	393	}
241	}	394	}
242		395
243	void	396	void
244	vpn::udpv4_ev (io_watcher &w, short revents)	397	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	398	{
246	if (revents & (POLLIN \| POLLERR))	399	if (revents & EVENT_READ)
247	{	400	{
248	vpn_packet *pkt = new vpn_packet;	401	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	402	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	403	socklen_t sa_len = sizeof (sa);
251	int len;	404	int len;
252		405
253	len = recvfrom (w.p->fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	406	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		407
255	sockinfo si(sa);	408	sockinfo si(sa, PROT_IPv4);
256		409
257	if (len > 0)	410	if (len > 0)
258	{	411	{
259	pkt->len = len;	412	pkt->len = len;
		413
		414	// raw sockets deliver the ipv4, but don't expect it on sends
		415	// this is slow, but...
		416	pkt->skip_hdr (IP_OVERHEAD);
260		417
261	recv_vpn_packet (pkt, si);	418	recv_vpn_packet (pkt, si);
262	}	419	}
263	else	420	else
264	{	421	{
265	// probably ECONNRESET or somesuch	422	// probably ECONNRESET or somesuch
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	423	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	424	}
268		425
269	delete pkt;	426	delete pkt;
270	}
271	else if (revents & POLLHUP)
272	{
273	// this cannot ;) happen on udp sockets
274	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
275	exit (1);
276	}	427	}
277	else	428	else
278	{	429	{
279	slog (L_ERR,	430	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	431	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	432	revents);
282	exit (1);	433	exit (EXIT_FAILURE);
283	}	434	}
284	}	435	}
285		436
		437	#if ENABLE_ICMP
286	void	438	void
287	vpn::ipv4_ev (io_watcher &w, short revents)	439	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	440	{
289	if (revents & (POLLIN \| POLLERR))	441	if (revents & EVENT_READ)
290	{	442	{
291	vpn_packet *pkt = new vpn_packet;	443	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	444	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	445	socklen_t sa_len = sizeof (sa);
294	int len;	446	int len;
295		447
296	len = recvfrom (w.p->fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	448	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		449
298	sockinfo si(sa, PROT_IPv4);	450	sockinfo si(sa, PROT_ICMPv4);
299		451
300	if (len > 0)	452	if (len > 0)
301	{	453	{
302	pkt->len = len;	454	pkt->len = len;
303		455
		456	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		457
		458	if (hdr->type == ::conf.icmp_type
		459	&& hdr->code == 255)
		460	{
304	// raw sockets deliver the ipv4, but don't expect it on sends	461	// raw sockets deliver the ipv4, but don't expect it on sends
305	// this is slow, but...	462	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	463	pkt->skip_hdr (ICMP_OVERHEAD);
307		464
308	recv_vpn_packet (pkt, si);	465	recv_vpn_packet (pkt, si);
		466	}
309	}	467	}
310	else	468	else
311	{	469	{
312	// probably ECONNRESET or somesuch	470	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	471	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	472	}
315		473
316	delete pkt;	474	delete pkt;
317	}
318	else if (revents & POLLHUP)
319	{
320	// this cannot ;) happen on udp sockets
321	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
322	exit (1);
323	}	475	}
324	else	476	else
325	{	477	{
326	slog (L_ERR,	478	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	479	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	480	revents);
329	exit (1);	481	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_connection;
336
337	struct lt_sockinfo
338	{
339	bool operator()(const sockinfo a, const sockinfo b) const
340	{
341	return a < b;
342	}
343	};
344
345	struct tcp_si_map : public map<const sockinfo , tcp_connection , lt_sockinfo> {
346	void cleaner_cb (time_watcher &w); time_watcher cleaner;
347
348	tcp_si_map ()
349	: cleaner(this, &tcp_si_map::cleaner_cb)
350	{
351	cleaner.start (0);
352	}
353	} tcp_si;
354
355	struct tcp_connection : io_watcher {
356	tstamp last_activity;
357	const sockinfo si;
358	vpn &v;
359	bool ok;
360
361	vpn_packet *r_pkt;
362	u32 r_len, r_ofs;
363
364	void tcpv4_ev (io_watcher &w, short revents);
365
366	operator tcp_si_map::value_type()
367	{
368	return tcp_si_map::value_type (&si, this);
369	}
370
371	tcp_connection (int fd, const sockinfo &si_, vpn &v_)
372	: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev)
373	{
374	last_activity = NOW;
375	ok = false;
376	r_pkt = 0;
377	start (fd, POLLOUT);
378	}
379
380	~tcp_connection () { if (p) close (p->fd); }
381	};
382
383	void tcp_si_map::cleaner_cb (time_watcher &w)
384	{
385	w.at = NOW + 600;
386	tstamp to = NOW - ::conf.keepalive - 30;
387
388	for (iterator i = begin (); i != end(); )
389	if (i->second->last_activity >= to)
390	++i;
391	else
392	{
393	erase (i);
394	i = begin ();
395	}	482	}
396	}	483	}
397
398	void
399	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
400	{
401	tcp_si_map::iterator info = tcp_si.find (&si);
402
403	if (info == tcp_si.end ())
404	{
405	// woaw, the first lost packet ;)
406	int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
407
408	if (fd >= 0)
409	{
410	fcntl (fd, F_SETFL, O_NONBLOCK);
411
412	if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0
413	\|\| errno == EINPROGRESS)
414	{
415	tcp_connection i = new tcp_connection (fd, si, this);
416
417	tcp_si.insert (*i);
418	}
419	else
420	close (fd);
421	}
422	}
423	else
424	{
425	tcp_connection *i = info->second;
426
427	i->last_activity = NOW;
428
429	if (i->ok)
430	{
431	setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
432
433	// we use none of the advantages of tcp
434	write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32);
435	}
436	}
437
438	#if 0
439	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
440	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
441	#endif	484	#endif
442	}
443		485
444	void	486	void
445	tcp_connection::tcpv4_ev (io_watcher &w, short revents)
446	{
447	last_activity = NOW;
448
449	if (!ok) // just established?
450	{
451	ok = true;
452	set (POLLIN);
453	}
454
455	if (revents & (POLLIN \| POLLERR))
456	{
457	u32 len;
458
459	if (sizeof (len) == read (p->fd, &len, sizeof (len)))
460	{
461	vpn_packet *pkt = new vpn_packet;
462
463	if (len == read (p->fd, &((*pkt)[0]), len))
464	{
465	pkt->len = len;
466
467	v.recv_vpn_packet (pkt, si);
468	return;
469	}
470
471	delete pkt;
472	}
473
474	tcp_si.erase (&si);
475
476	set (0);//D
477	}
478	}
479
480	void
481	vpn::tcpv4_ev (io_watcher &w, short revents)	487	vpn::udpv4_ev (io_watcher &w, short revents)
482	{	488	{
483	if (revents & (POLLIN \| POLLERR))	489	if (revents & EVENT_READ)
484	{	490	{
		491	vpn_packet *pkt = new vpn_packet;
485	struct sockaddr_in sa;	492	struct sockaddr_in sa;
486	socklen_t sa_len = sizeof (sa);	493	socklen_t sa_len = sizeof (sa);
487	int len;	494	int len;
488		495
489	int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len);	496	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
490		497
491	if (fd >= 0)
492	{
493	fcntl (fd, F_SETFL, O_NONBLOCK);
494
495	sockinfo si(sa, PROT_TCPv4);	498	sockinfo si(sa, PROT_UDPv4);
496	tcp_connection i = new tcp_connection (fd, si, this);
497		499
498	slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D	500	if (len > 0)
499
500	tcp_si.insert (*i);
501	}	501	{
		502	pkt->len = len;
		503
		504	recv_vpn_packet (pkt, si);
		505	}
		506	else
		507	{
		508	// probably ECONNRESET or somesuch
		509	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		510	}
		511
		512	delete pkt;
		513	}
		514	else
502	}	515	{
		516	slog (L_ERR,
		517	_("FATAL: unknown revents %08x in socket, terminating\n"),
		518	revents);
		519	exit (EXIT_FAILURE);
		520	}
503	}	521	}
504
505	#endif
506		522
507	void	523	void
508	vpn::tap_ev (io_watcher &w, short revents)	524	vpn::tap_ev (io_watcher &w, short revents)
509	{	525	{
510	if (revents & POLLIN)	526	if (revents & EVENT_READ)
511	{	527	{
512	/* process data */	528	/* process data */
513	tap_packet *pkt;	529	tap_packet *pkt;
514		530
515	pkt = tap->recv ();	531	pkt = tap->recv ();
516		532
		533	if (!pkt)
		534	return;
		535
		536	if (pkt->len > 14)
		537	{
517	int dst = mac2id (pkt->dst);	538	int dst = mac2id (pkt->dst);
518	int src = mac2id (pkt->src);	539	int src = mac2id (pkt->src);
519		540
520	if (src != THISNODE->id)	541	if (src != THISNODE->id)
521	{
522	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
523	exit (1);
524	}
525
526	if (dst == THISNODE->id)
527	{
528	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
529	exit (1);
530	}
531
532	if (dst > conns.size ())
533	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
534	else
535	{
536	if (dst)
537	{	542	{
538	// unicast	543	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
539	if (dst != THISNODE->id)	544	exit (EXIT_FAILURE);
540	conns[dst - 1]->inject_data_packet (pkt);
541	}	545	}
		546
		547	if (dst == THISNODE->id)
		548	{
		549	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		550	exit (EXIT_FAILURE);
		551	}
		552
		553	if (dst > conns.size ())
		554	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
542	else	555	else
543	{
544	// broadcast, first check router, then self, then english
545	connection *router = find_router ();
546
547	if (router)
548	router->inject_data_packet (pkt, true);	556	inject_data_packet (pkt, dst);
549	else
550	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
551	if ((*c)->conf != THISNODE)
552	(*c)->inject_data_packet (pkt);
553	}
554	}	557	}
555		558
556	delete pkt;	559	delete pkt;
557	}
558	else if (revents & (POLLHUP \| POLLERR))
559	{
560	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
561	exit (1);
562	}	560	}
563	else	561	else
564	abort ();	562	abort ();
565	}	563	}
566		564
…		…
572	if (events & EVENT_SHUTDOWN)	570	if (events & EVENT_SHUTDOWN)
573	{	571	{
574	slog (L_INFO, _("preparing shutdown..."));	572	slog (L_INFO, _("preparing shutdown..."));
575		573
576	shutdown_all ();	574	shutdown_all ();
577
578	remove_pid (pidfilename);	575	remove_pid (conf.pidfilename);
579
580	slog (L_INFO, _("terminating"));	576	slog (L_INFO, _("terminating"));
581		577	exit (EXIT_SUCCESS);
582	exit (0);
583	}	578	}
584		579
585	if (events & EVENT_RECONNECT)	580	if (events & EVENT_RECONNECT)
586	{	581	{
587	slog (L_INFO, _("forced reconnect"));	582	slog (L_INFO, _("forced reconnect"));
…		…
589	reconnect_all ();	584	reconnect_all ();
590	}	585	}
591		586
592	events = 0;	587	events = 0;
593	}	588	}
594
595	w.at = TSTAMP_CANCEL;
596	}	589	}
597		590
598	void	591	void
599	vpn::shutdown_all ()	592	vpn::shutdown_all ()
600	{	593	{
…		…
613	connection_init ();	606	connection_init ();
614		607
615	for (configuration::node_vector::iterator i = conf.nodes.begin ();	608	for (configuration::node_vector::iterator i = conf.nodes.begin ();
616	i != conf.nodes.end (); ++i)	609	i != conf.nodes.end (); ++i)
617	{	610	{
618	connection *conn = new connection (this);	611	connection conn = new connection (this, i);
619
620	conn->conf = *i;
621	conns.push_back (conn);	612	conns.push_back (conn);
622
623	conn->establish_connection ();	613	conn->establish_connection ();
624	}	614	}
625	}	615	}
626		616
627	connection *vpn::find_router ()	617	connection *vpn::find_router ()
628	{	618	{
629	u32 prio = 0;	619	u32 prio = 1;
630	connection *router = 0;	620	connection *router = 0;
631		621
632	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	622	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
633	{	623	{
634	connection c = i;	624	connection c = i;
635		625
636	if (c->conf->routerprio > prio	626	if (c->conf->routerprio > prio
637	&& c->connectmode == conf_node::C_ALWAYS	627	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
638	&& c->conf != THISNODE
639	&& c->ictx && c->octx)	628	&& c->ictx && c->octx
		629	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
640	{	630	{
641	prio = c->conf->routerprio;	631	prio = c->conf->routerprio;
642	router = c;	632	router = c;
643	}	633	}
644	}	634	}
645		635
646	return router;	636	return router;
647	}	637	}
648		638
649	void vpn::connect_request (int id)	639	void vpn::send_connect_request (int id)
650	{	640	{
651	connection *c = find_router ();	641	connection *c = find_router ();
652		642
653	if (c)	643	if (c)
654	c->connect_request (id);	644	c->send_connect_request (id);
655	//else // does not work, because all others must connect to the same router	645	else
656	// // no router found, aggressively connect to all routers	646	// no router found, aggressively connect to all routers
657	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	647	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
658	// if ((*i)->conf->routerprio)	648	if ((i)->conf->routerprio && (i)->conf != THISNODE)
659	// (*i)->establish_connection ();	649	(*i)->establish_connection ();
660	}	650	}
661		651
662	void	652	void
663	connection::dump_status ()	653	connection::dump_status ()
664	{	654	{
…		…
681		671
682	slog (L_NOTICE, _("END status dump"));	672	slog (L_NOTICE, _("END status dump"));
683	}	673	}
684		674
685	vpn::vpn (void)	675	vpn::vpn (void)
686	: event(this, &vpn::event_cb)	676	: event (this, &vpn::event_cb)
687	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	677	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
688	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	678	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
689	, tap_ev_watcher (this, &vpn::tap_ev)
690	#if ENABLE_TCP	679	#if ENABLE_TCP
691	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	680	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
692	#endif	681	#endif
		682	#if ENABLE_ICMP
		683	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		684	#endif
		685	#if ENABLE_DNS
		686	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		687	#endif
		688	, tap_ev_watcher (this, &vpn::tap_ev)
693	{	689	{
694	}	690	}
695		691
696	vpn::~vpn ()	692	vpn::~vpn ()
697	{	693	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs. Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs.
Revision 1.27 by pcg, Tue Mar 1 06:27:20 2005 UTC