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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.31 by pcg, Sat Mar 5 19:13:16 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) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	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	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <errno.h>	33	#include <errno.h>
32	#include <time.h>	34	#include <time.h>
33	#include <unistd.h>	35	#include <unistd.h>
34	#include <arpa/inet.h>	36	#include <fcntl.h>
35	#include <netinet/in.h>	37	#include <sys/socket.h>
36	#include <netinet/ip_icmp.h>	38
		39	#include "netcompat.h"
37		40
38	#include "pidfile.h"	41	#include "pidfile.h"
39		42
40	#include "connection.h"	43	#include "connection.h"
41	#include "util.h"	44	#include "util.h"
42	#include "vpn.h"	45	#include "vpn.h"
		46
		47	vpn network; // THE vpn (bad design...)
43		48
44	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
45		50
46	const char *vpn::script_if_up ()	51	const char *vpn::script_if_up ()
47	{	52	{
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		59
55	char *env;	60	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
69	putenv (env);	71	putenv (env);
70		72
…		…
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		84
83	if (ipv4_fd < 0)	85	if (ipv4_fd < 0)
84	return -1;	86	return -1;
85		87
86	#ifdef IP_MTU_DISCOVER	88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	91	// this I really consider a linux bug. I am neither connected
88	// nor do I fragment myself. Linux still sets DF and doesn't	92	// nor do I fragment myself. Linux still sets DF and doesn't
89	// fragment for me sometimes.	93	// fragment for me sometimes.
90	{	94	{
91	int oval = IP_PMTUDISC_DONT;	95	int oval = IP_PMTUDISC_DONT;
…		…
96	sockinfo si (THISNODE, PROT_IPv4);	100	sockinfo si (THISNODE, PROT_IPv4);
97		101
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	103	{
100	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
101	exit (1);	105	exit (EXIT_FAILURE);
102	}	106	}
103		107
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
105	}	109	}
106		110
107	udpv4_fd = -1;	111	udpv4_fd = -1;
108		112
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	114	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		116
113	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
114	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
115		121
116	// standard daemon practise...	122	// standard daemon practise...
117	{	123	{
118	int oval = 1;	124	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	126	}
121		127
122	#ifdef IP_MTU_DISCOVER	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
124	// nor do I fragment myself. Linux still sets DF and doesn't	130	// nor do I fragment myself. Linux still sets DF and doesn't
125	// fragment for me sometimes.	131	// fragment for me sometimes.
126	{	132	{
127	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	138	sockinfo si (THISNODE, PROT_UDPv4);
133		139
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	141	{
136	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
137	exit (1);	143	exit (EXIT_FAILURE);
138	}	144	}
139		145
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
141	}	147	}
142		148
143	icmpv4_fd = -1;	149	icmpv4_fd = -1;
144		150
145	#if ENABLE_ICMP	151	#if ENABLE_ICMP
…		…
147	{	153	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		155
150	if (icmpv4_fd < 0)	156	if (icmpv4_fd < 0)
151	return -1;	157	return -1;
		158
		159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
152		160
153	#ifdef ICMP_FILTER	161	#ifdef ICMP_FILTER
154	{	162	{
155	icmp_filter oval;	163	icmp_filter oval;
156	oval.data = 0xffffffff;	164	oval.data = 0xffffffff;
…		…
159		167
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	169	}
162	#endif	170	#endif
163		171
164	#ifdef IP_MTU_DISCOVER	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
166	// nor do I fragment myself. Linux still sets DF and doesn't	174	// nor do I fragment myself. Linux still sets DF and doesn't
167	// fragment for me sometimes.	175	// fragment for me sometimes.
168	{	176	{
169	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
…		…
174	sockinfo si (THISNODE, PROT_ICMPv4);	182	sockinfo si (THISNODE, PROT_ICMPv4);
175		183
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	185	{
178	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
179	exit (1);	187	exit (EXIT_FAILURE);
180	}	188	}
181		189
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
183	}	191	}
184	#endif	192	#endif
185		193
186	tcpv4_fd = -1;	194	tcpv4_fd = -1;
187		195
…		…
190	{	198	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		200
193	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
194	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
195		205
196	// standard daemon practise...	206	// standard daemon practise...
197	{	207	{
198	int oval = 1;	208	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
203		213
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	215	{
206	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
207	exit (1);	217	exit (EXIT_FAILURE);
208	}	218	}
209		219
210	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
211	{	221	{
212	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
213	exit (1);	223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		234
		235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		236
		237	if (dnsv4_fd < 0)
		238	return -1;
		239
		240	// standard daemon practise...
		241	{
		242	int oval = 1;
		243	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		244	}
		245
		246	sockinfo si (THISNODE->dns_hostname,
		247	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		248	PROT_DNSv4);
		249
		250	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
214	}	251	{
		252	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		253	exit (EXIT_FAILURE);
		254	}
215		255
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	256	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
217	}	257	}
218	#endif	258	#endif
219		259
220	tap = new tap_device ();	260	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	261	if (!tap) //D this, of course, never catches
222	{	262	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	263	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	264	exit (EXIT_FAILURE);
225	}	265	}
226		266
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	267	run_script (run_script_cb (this, &vpn::script_if_up), true);
228		268
229	tap_ev_watcher.start (tap->fd, POLLIN);	269	tap_ev_watcher.start (tap->fd, EVENT_READ);
230		270
231	reconnect_all ();	271	reconnect_all ();
232		272
233	return 0;	273	return 0;
234	}
235
236	// send a vpn packet out to other hosts
237	bool
238	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
239	{
240	switch (si.prot)
241	{
242	case PROT_IPv4:
243	return send_ipv4_packet (pkt, si, tos);
244
245	case PROT_UDPv4:
246	return send_udpv4_packet (pkt, si, tos);
247
248	#if ENABLE_TCP
249	case PROT_TCPv4:
250	return send_tcpv4_packet (pkt, si, tos);
251	#endif
252
253	#if ENABLE_ICMP
254	case PROT_ICMPv4:
255	return send_icmpv4_packet (pkt, si, tos);
256	#endif
257
258	default:
259	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
260	return false;
261	}
262	}	274	}
263		275
264	bool	276	bool
265	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	277	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
266	{	278	{
		279	#if defined(SOL_IP) && defined(IP_TOS)
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	280	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		281	#endif
268	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	282	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
269		283
270	return true;	284	return true;
271	}	285	}
272		286
…		…
291	sum += (sum >> 16); // carry	305	sum += (sum >> 16); // carry
292		306
293	return ~sum;	307	return ~sum;
294	}	308	}
295		309
		310	#if ENABLE_ICMP
296	bool	311	bool
297	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	312	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298	{	313	{
		314	#if defined(SOL_IP) && defined(IP_TOS)
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	315	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		316	#endif
300		317
301	pkt->unshift_hdr (4);	318	pkt->unshift_hdr (4);
302		319
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	320	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	321	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	322	hdr->code = 255;
306	hdr->checksum = 0;	323	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	324	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		325
309	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	326	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310		327
311	return true;	328	return true;
312	}	329	}
		330	#endif
313		331
314	bool	332	bool
315	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	333	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
316	{	334	{
		335	#if defined(SOL_IP) && defined(IP_TOS)
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	336	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		337	#endif
318	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	338	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		339
320	return true;	340	return true;
		341	}
		342
		343	void
		344	vpn::inject_data_packet (tap_packet *pkt, int dst)
		345	{
		346	if (dst)
		347	{
		348	// unicast
		349	if (dst != THISNODE->id)
		350	conns[dst - 1]->inject_data_packet (pkt);
		351	}
		352	else
		353	{
		354	// broadcast, this is ugly, but due to the security policy
		355	// we have to connect to all hosts...
		356	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		357	if ((*c)->conf != THISNODE)
		358	(*c)->inject_data_packet (pkt, true);
		359	}
321	}	360	}
322		361
323	void	362	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	363	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	364	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	378	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	379	else
341	{	380	{
342	connection *c = conns[src - 1];	381	connection *c = conns[src - 1];
343		382
344	if (dst == 0 && !THISNODE->routerprio)	383	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	384	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	385	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	386	else if (dst != THISNODE->id)
348	{	387	{
349	if (THISNODE->routerprio)	388	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	389	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	390	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	391	else
…		…
358	else	397	else
359	c->recv_vpn_packet (pkt, rsi);	398	c->recv_vpn_packet (pkt, rsi);
360	}	399	}
361	}	400	}
362		401
		402	bool
		403	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		404	{
		405	switch (si.prot)
		406	{
		407	case PROT_IPv4:
		408	return send_ipv4_packet (pkt, si, tos);
		409	case PROT_UDPv4:
		410	return send_udpv4_packet (pkt, si, tos);
		411	#if ENABLE_TCP
		412	case PROT_TCPv4:
		413	return send_tcpv4_packet (pkt, si, tos);
		414	#endif
		415	#if ENABLE_ICMP
		416	case PROT_ICMPv4:
		417	return send_icmpv4_packet (pkt, si, tos);
		418	#endif
		419	#if ENABLE_DNS
		420	case PROT_DNSv4:
		421	return send_dnsv4_packet (pkt, si, tos);
		422	#endif
		423
		424	default:
		425	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		426	}
		427
		428	return false;
		429	}
		430
363	void	431	void
364	vpn::ipv4_ev (io_watcher &w, short revents)	432	vpn::ipv4_ev (io_watcher &w, short revents)
365	{	433	{
366	if (revents & (POLLIN \| POLLERR))	434	if (revents & EVENT_READ)
367	{	435	{
368	vpn_packet *pkt = new vpn_packet;	436	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	437	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	438	socklen_t sa_len = sizeof (sa);
371	int len;	439	int len;
…		…
376		444
377	if (len > 0)	445	if (len > 0)
378	{	446	{
379	pkt->len = len;	447	pkt->len = len;
380		448
381	// raw sockets deliver the ipv4, but don't expect it on sends	449	// raw sockets deliver the ipv4 header, but don't expect it on sends
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	450	pkt->skip_hdr (IP_OVERHEAD);
384		451
385	recv_vpn_packet (pkt, si);	452	recv_vpn_packet (pkt, si);
386	}	453	}
387	else	454	else
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	457	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	458	}
392		459
393	delete pkt;	460	delete pkt;
394	}	461	}
395	else if (revents & POLLHUP)
396	{
397	// this cannot ;) happen on udp sockets
398	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
399	exit (1);
400	}
401	else	462	else
402	{	463	{
403	slog (L_ERR,	464	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	465	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	466	revents);
406	exit (1);	467	exit (EXIT_FAILURE);
407	}	468	}
408	}	469	}
409		470
		471	#if ENABLE_ICMP
410	void	472	void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	473	vpn::icmpv4_ev (io_watcher &w, short revents)
412	{	474	{
413	if (revents & (POLLIN \| POLLERR))	475	if (revents & EVENT_READ)
414	{	476	{
415	vpn_packet *pkt = new vpn_packet;	477	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	478	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	479	socklen_t sa_len = sizeof (sa);
418	int len;	480	int len;
…		…
423		485
424	if (len > 0)	486	if (len > 0)
425	{	487	{
426	pkt->len = len;	488	pkt->len = len;
427		489
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	490	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		491
430	if (hdr->type == ::conf.icmp_type	492	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	493	&& hdr->code == 255)
432	{	494	{
433	// raw sockets deliver the ipv4, but don't expect it on sends	495	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	505	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	506	}
445		507
446	delete pkt;	508	delete pkt;
447	}	509	}
448	else if (revents & POLLHUP)
449	{
450	// this cannot ;) happen on udp sockets
451	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
452	exit (1);
453	}
454	else	510	else
455	{	511	{
456	slog (L_ERR,	512	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	513	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	514	revents);
459	exit (1);	515	exit (EXIT_FAILURE);
460	}	516	}
461	}	517	}
		518	#endif
462		519
463	void	520	void
464	vpn::udpv4_ev (io_watcher &w, short revents)	521	vpn::udpv4_ev (io_watcher &w, short revents)
465	{	522	{
466	if (revents & (POLLIN \| POLLERR))	523	if (revents & EVENT_READ)
467	{	524	{
468	vpn_packet *pkt = new vpn_packet;	525	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	526	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	527	socklen_t sa_len = sizeof (sa);
471	int len;	528	int len;
…		…
486	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	543	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
487	}	544	}
488		545
489	delete pkt;	546	delete pkt;
490	}	547	}
491	else if (revents & POLLHUP)
492	{
493	// this cannot ;) happen on udp sockets
494	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
495	exit (1);
496	}
497	else	548	else
498	{	549	{
499	slog (L_ERR,	550	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	551	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	552	revents);
502	exit (1);	553	exit (EXIT_FAILURE);
503	}	554	}
504	}	555	}
505		556
506	void	557	void
507	vpn::tap_ev (io_watcher &w, short revents)	558	vpn::tap_ev (io_watcher &w, short revents)
508	{	559	{
509	if (revents & POLLIN)	560	if (revents & EVENT_READ)
510	{	561	{
511	/* process data */	562	/* process data */
512	tap_packet *pkt;	563	tap_packet *pkt;
513		564
514	pkt = tap->recv ();	565	pkt = tap->recv ();
515		566
		567	if (!pkt)
		568	return;
		569
		570	if (pkt->len > 14)
		571	{
516	int dst = mac2id (pkt->dst);	572	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	573	int src = mac2id (pkt->src);
518		574
519	if (src != THISNODE->id)	575	if (src != THISNODE->id)
520	{
521	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
522	exit (1);
523	}
524
525	if (dst == THISNODE->id)
526	{
527	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
528	exit (1);
529	}
530
531	if (dst > conns.size ())
532	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
533	else
534	{
535	if (dst)
536	{	576	{
537	// unicast	577	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	578	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	579	}
		580
		581	if (dst == THISNODE->id)
		582	{
		583	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		584	exit (EXIT_FAILURE);
		585	}
		586
		587	if (dst > conns.size ())
		588	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
541	else	589	else
542	{
543	// broadcast, first check router, then self, then english
544	connection *router = find_router ();
545
546	if (router)
547	router->inject_data_packet (pkt, true);	590	inject_data_packet (pkt, dst);
548	else
549	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
550	if ((*c)->conf != THISNODE)
551	(*c)->inject_data_packet (pkt);
552	}
553	}	591	}
554		592
555	delete pkt;	593	delete pkt;
556	}
557	else if (revents & (POLLHUP \| POLLERR))
558	{
559	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
560	exit (1);
561	}	594	}
562	else	595	else
563	abort ();	596	abort ();
564	}	597	}
565		598
…		…
571	if (events & EVENT_SHUTDOWN)	604	if (events & EVENT_SHUTDOWN)
572	{	605	{
573	slog (L_INFO, _("preparing shutdown..."));	606	slog (L_INFO, _("preparing shutdown..."));
574		607
575	shutdown_all ();	608	shutdown_all ();
576
577	remove_pid (pidfilename);	609	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	610	slog (L_INFO, _("terminating"));
580		611	exit (EXIT_SUCCESS);
581	exit (0);
582	}	612	}
583		613
584	if (events & EVENT_RECONNECT)	614	if (events & EVENT_RECONNECT)
585	{	615	{
586	slog (L_INFO, _("forced reconnect"));	616	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	618	reconnect_all ();
589	}	619	}
590		620
591	events = 0;	621	events = 0;
592	}	622	}
593
594	w.at = TSTAMP_CANCEL;
595	}	623	}
596		624
597	void	625	void
598	vpn::shutdown_all ()	626	vpn::shutdown_all ()
599	{	627	{
…		…
612	connection_init ();	640	connection_init ();
613		641
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	642	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	643	i != conf.nodes.end (); ++i)
616	{	644	{
617	connection *conn = new connection (this);	645	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	646	conns.push_back (conn);
621
622	conn->establish_connection ();	647	conn->establish_connection ();
623	}	648	}
624	}	649	}
625		650
626	connection *vpn::find_router ()	651	connection *vpn::find_router ()
627	{	652	{
628	u32 prio = 0;	653	u32 prio = 1;
629	connection *router = 0;	654	connection *router = 0;
630		655
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	657	{
633	connection c = i;	658	connection c = i;
634		659
635	if (c->conf->routerprio > prio	660	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	661	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
637	&& c->conf != THISNODE
638	&& c->ictx && c->octx)	662	&& c->ictx && c->octx
		663	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	664	{
640	prio = c->conf->routerprio;	665	prio = c->conf->routerprio;
641	router = c;	666	router = c;
642	}	667	}
643	}	668	}
…		…
652	if (c)	677	if (c)
653	c->send_connect_request (id);	678	c->send_connect_request (id);
654	else	679	else
655	// no router found, aggressively connect to all routers	680	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	681	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	682	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	683	(*i)->establish_connection ();
659	}	684	}
660		685
661	void	686	void
662	connection::dump_status ()	687	connection::dump_status ()
…		…
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	714	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
690	#endif	715	#endif
691	#if ENABLE_ICMP	716	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	717	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693	#endif	718	#endif
		719	#if ENABLE_DNS
		720	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		721	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	722	, tap_ev_watcher (this, &vpn::tap_ev)
695	{	723	{
696	}	724	}
697		725
698	vpn::~vpn ()	726	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs. Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC