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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 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/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"
43		46
		47	vpn network; // THE vpn (bad design...)
		48
44	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
45		50
46	const char *vpn::script_if_up ()	51	void
		52	vpn::script_init_env ()
47	{	53	{
48	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
49	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
50	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		60
55	char *env;	61	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	63	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);	64	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	65	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	66	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		67	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	68	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68	THISNODE->id & 0xff);	71	THISNODE->id & 0xff); putenv (env);
69	putenv (env);
70		72
		73	// TODO: info for other nodes, maybe?
		74	}
		75
		76	const char *vpn::script_if_init ()
		77	{
		78	script_init_env ();
		79
		80	return tap->if_up ();
		81	}
		82
		83	const char *vpn::script_if_up ()
		84	{
		85	script_init_env ();
		86
		87	char *filename;
		88	asprintf (&filename,
		89	"%s/%s",
		90	confbase,
71	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	91	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		92
		93	return filename;
72	}	94	}
73		95
74	int	96	int
75	vpn::setup ()	97	vpn::setup ()
76	{	98	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	103	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		104
83	if (ipv4_fd < 0)	105	if (ipv4_fd < 0)
84	return -1;	106	return -1;
85		107
86	#ifdef IP_MTU_DISCOVER	108	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		109
		110	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	111	// this I really consider a linux bug. I am neither connected
88	// nor do I fragment myself. Linux still sets DF and doesn't	112	// nor do I fragment myself. Linux still sets DF and doesn't
89	// fragment for me sometimes.	113	// fragment for me sometimes.
90	{	114	{
91	int oval = IP_PMTUDISC_DONT;	115	int oval = IP_PMTUDISC_DONT;
…		…
96	sockinfo si (THISNODE, PROT_IPv4);	120	sockinfo si (THISNODE, PROT_IPv4);
97		121
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	123	{
100	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
101	exit (1);	125	exit (EXIT_FAILURE);
102	}	126	}
103		127
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	128	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
105	}	129	}
106		130
107	udpv4_fd = -1;	131	udpv4_fd = -1;
108		132
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	133	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	134	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	135	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		136
113	if (udpv4_fd < 0)	137	if (udpv4_fd < 0)
114	return -1;	138	return -1;
		139
		140	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
115		141
116	// standard daemon practise...	142	// standard daemon practise...
117	{	143	{
118	int oval = 1;	144	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	145	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	146	}
121		147
122	#ifdef IP_MTU_DISCOVER	148	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	149	// this I really consider a linux bug. I am neither connected
124	// nor do I fragment myself. Linux still sets DF and doesn't	150	// nor do I fragment myself. Linux still sets DF and doesn't
125	// fragment for me sometimes.	151	// fragment for me sometimes.
126	{	152	{
127	int oval = IP_PMTUDISC_DONT;	153	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	158	sockinfo si (THISNODE, PROT_UDPv4);
133		159
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	160	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	161	{
136	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	162	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
137	exit (1);	163	exit (EXIT_FAILURE);
138	}	164	}
139		165
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	166	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
141	}	167	}
142		168
143	icmpv4_fd = -1;	169	icmpv4_fd = -1;
144		170
145	#if ENABLE_ICMP	171	#if ENABLE_ICMP
…		…
147	{	173	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	174	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		175
150	if (icmpv4_fd < 0)	176	if (icmpv4_fd < 0)
151	return -1;	177	return -1;
		178
		179	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
152		180
153	#ifdef ICMP_FILTER	181	#ifdef ICMP_FILTER
154	{	182	{
155	icmp_filter oval;	183	icmp_filter oval;
156	oval.data = 0xffffffff;	184	oval.data = 0xffffffff;
…		…
159		187
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	188	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	189	}
162	#endif	190	#endif
163		191
164	#ifdef IP_MTU_DISCOVER	192	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	193	// this I really consider a linux bug. I am neither connected
166	// nor do I fragment myself. Linux still sets DF and doesn't	194	// nor do I fragment myself. Linux still sets DF and doesn't
167	// fragment for me sometimes.	195	// fragment for me sometimes.
168	{	196	{
169	int oval = IP_PMTUDISC_DONT;	197	int oval = IP_PMTUDISC_DONT;
…		…
174	sockinfo si (THISNODE, PROT_ICMPv4);	202	sockinfo si (THISNODE, PROT_ICMPv4);
175		203
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	204	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	205	{
178	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	206	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
179	exit (1);	207	exit (EXIT_FAILURE);
180	}	208	}
181		209
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	210	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
183	}	211	}
184	#endif	212	#endif
185		213
186	tcpv4_fd = -1;	214	tcpv4_fd = -1;
187		215
…		…
190	{	218	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	219	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		220
193	if (tcpv4_fd < 0)	221	if (tcpv4_fd < 0)
194	return -1;	222	return -1;
		223
		224	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
195		225
196	// standard daemon practise...	226	// standard daemon practise...
197	{	227	{
198	int oval = 1;	228	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	229	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	232	sockinfo si (THISNODE, PROT_TCPv4);
203		233
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	234	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	235	{
206	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	236	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
207	exit (1);	237	exit (EXIT_FAILURE);
208	}	238	}
209		239
210	if (listen (tcpv4_fd, 5))	240	if (listen (tcpv4_fd, 5))
211	{	241	{
212	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	242	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
213	exit (1);	243	exit (EXIT_FAILURE);
		244	}
		245
		246	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		247	}
		248	#endif
		249
		250	#if ENABLE_DNS
		251	if (THISNODE->protocols & PROT_DNSv4)
		252	{
		253	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		254
		255	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		256
		257	if (dnsv4_fd < 0)
		258	return -1;
		259
		260	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		261	// this I really consider a linux bug. I am neither connected
		262	// nor do I fragment myself. Linux still sets DF and doesn't
		263	// fragment for me sometimes.
		264	{
		265	int oval = IP_PMTUDISC_DONT;
		266	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		267	}
		268	#endif
		269
		270	// standard daemon practise...
		271	{
		272	int oval = 1;
		273	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		274	}
		275
		276	sockinfo si (THISNODE->dns_hostname,
		277	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		278	PROT_DNSv4);
		279
		280	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
214	}	281	{
		282	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		283	exit (EXIT_FAILURE);
		284	}
215		285
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	286	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
217	}	287	}
218	#endif	288	#endif
219		289
220	tap = new tap_device ();	290	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	291	if (!tap) //D this, of course, never catches
222	{	292	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	293	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	294	exit (EXIT_FAILURE);
225	}	295	}
226		296
		297	if (tap->if_up () &&
		298	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		299	{
		300	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		301	tap->if_up ());
		302	exit (EXIT_FAILURE);
		303	}
		304
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	305	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		306	{
		307	slog (L_ERR, _("if-up command execution failed, exiting."));
		308	exit (EXIT_FAILURE);
		309	}
228		310
229	tap_ev_watcher.start (tap->fd, POLLIN);	311	tap_ev_watcher.start (tap->fd, EVENT_READ);
230		312
231	reconnect_all ();	313	reconnect_all ();
232		314
233	return 0;	315	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	}	316	}
263		317
264	bool	318	bool
265	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	319	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
266	{	320	{
		321	#if defined(SOL_IP) && defined(IP_TOS)
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	322	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		323	#endif
268	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	324	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
269		325
270	return true;	326	return true;
271	}	327	}
272		328
…		…
291	sum += (sum >> 16); // carry	347	sum += (sum >> 16); // carry
292		348
293	return ~sum;	349	return ~sum;
294	}	350	}
295		351
		352	#if ENABLE_ICMP
296	bool	353	bool
297	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	354	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298	{	355	{
		356	#if defined(SOL_IP) && defined(IP_TOS)
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	357	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		358	#endif
300		359
301	pkt->unshift_hdr (4);	360	pkt->unshift_hdr (4);
302		361
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	362	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	363	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	364	hdr->code = 255;
306	hdr->checksum = 0;	365	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	366	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		367
309	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	368	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310		369
311	return true;	370	return true;
312	}	371	}
		372	#endif
313		373
314	bool	374	bool
315	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	375	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
316	{	376	{
		377	#if defined(SOL_IP) && defined(IP_TOS)
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	378	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		379	#endif
318	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	380	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		381
320	return true;	382	return true;
		383	}
		384
		385	void
		386	vpn::inject_data_packet (tap_packet *pkt, int dst)
		387	{
		388	if (dst)
		389	{
		390	// unicast
		391	if (dst != THISNODE->id)
		392	conns[dst - 1]->inject_data_packet (pkt);
		393	}
		394	else
		395	{
		396	// broadcast, this is ugly, but due to the security policy
		397	// we have to connect to all hosts...
		398	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		399	if ((*c)->conf != THISNODE)
		400	(*c)->inject_data_packet (pkt, true);
		401	}
321	}	402	}
322		403
323	void	404	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	405	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	406	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	420	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	421	else
341	{	422	{
342	connection *c = conns[src - 1];	423	connection *c = conns[src - 1];
343		424
344	if (dst == 0 && !THISNODE->routerprio)	425	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	426	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	427	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	428	else if (dst != THISNODE->id)
348	{	429	{
349	if (THISNODE->routerprio)	430	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	431	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	432	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	433	else
…		…
358	else	439	else
359	c->recv_vpn_packet (pkt, rsi);	440	c->recv_vpn_packet (pkt, rsi);
360	}	441	}
361	}	442	}
362		443
		444	bool
		445	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		446	{
		447	switch (si.prot)
		448	{
		449	case PROT_IPv4:
		450	return send_ipv4_packet (pkt, si, tos);
		451	case PROT_UDPv4:
		452	return send_udpv4_packet (pkt, si, tos);
		453	#if ENABLE_TCP
		454	case PROT_TCPv4:
		455	return send_tcpv4_packet (pkt, si, tos);
		456	#endif
		457	#if ENABLE_ICMP
		458	case PROT_ICMPv4:
		459	return send_icmpv4_packet (pkt, si, tos);
		460	#endif
		461	#if ENABLE_DNS
		462	case PROT_DNSv4:
		463	return send_dnsv4_packet (pkt, si, tos);
		464	#endif
		465
		466	default:
		467	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		468	}
		469
		470	return false;
		471	}
		472
363	void	473	void
364	vpn::ipv4_ev (io_watcher &w, short revents)	474	vpn::ipv4_ev (io_watcher &w, short revents)
365	{	475	{
366	if (revents & (POLLIN \| POLLERR))	476	if (revents & EVENT_READ)
367	{	477	{
368	vpn_packet *pkt = new vpn_packet;	478	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	479	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	480	socklen_t sa_len = sizeof (sa);
371	int len;	481	int len;
…		…
376		486
377	if (len > 0)	487	if (len > 0)
378	{	488	{
379	pkt->len = len;	489	pkt->len = len;
380		490
381	// raw sockets deliver the ipv4, but don't expect it on sends	491	// raw sockets deliver the ipv4 header, but don't expect it on sends
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	492	pkt->skip_hdr (IP_OVERHEAD);
384		493
385	recv_vpn_packet (pkt, si);	494	recv_vpn_packet (pkt, si);
386	}	495	}
387	else	496	else
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	499	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	500	}
392		501
393	delete pkt;	502	delete pkt;
394	}	503	}
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	504	else
402	{	505	{
403	slog (L_ERR,	506	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	507	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	508	revents);
406	exit (1);	509	exit (EXIT_FAILURE);
407	}	510	}
408	}	511	}
409		512
		513	#if ENABLE_ICMP
410	void	514	void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	515	vpn::icmpv4_ev (io_watcher &w, short revents)
412	{	516	{
413	if (revents & (POLLIN \| POLLERR))	517	if (revents & EVENT_READ)
414	{	518	{
415	vpn_packet *pkt = new vpn_packet;	519	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	520	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	521	socklen_t sa_len = sizeof (sa);
418	int len;	522	int len;
…		…
423		527
424	if (len > 0)	528	if (len > 0)
425	{	529	{
426	pkt->len = len;	530	pkt->len = len;
427		531
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	532	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		533
430	if (hdr->type == ::conf.icmp_type	534	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	535	&& hdr->code == 255)
432	{	536	{
433	// raw sockets deliver the ipv4, but don't expect it on sends	537	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	547	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	548	}
445		549
446	delete pkt;	550	delete pkt;
447	}	551	}
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	552	else
455	{	553	{
456	slog (L_ERR,	554	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	555	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	556	revents);
459	exit (1);	557	exit (EXIT_FAILURE);
460	}	558	}
461	}	559	}
		560	#endif
462		561
463	void	562	void
464	vpn::udpv4_ev (io_watcher &w, short revents)	563	vpn::udpv4_ev (io_watcher &w, short revents)
465	{	564	{
466	if (revents & (POLLIN \| POLLERR))	565	if (revents & EVENT_READ)
467	{	566	{
468	vpn_packet *pkt = new vpn_packet;	567	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	568	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	569	socklen_t sa_len = sizeof (sa);
471	int len;	570	int len;
…		…
486	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	585	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
487	}	586	}
488		587
489	delete pkt;	588	delete pkt;
490	}	589	}
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	590	else
498	{	591	{
499	slog (L_ERR,	592	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	593	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	594	revents);
502	exit (1);	595	exit (EXIT_FAILURE);
503	}	596	}
504	}	597	}
505		598
506	void	599	void
507	vpn::tap_ev (io_watcher &w, short revents)	600	vpn::tap_ev (io_watcher &w, short revents)
508	{	601	{
509	if (revents & POLLIN)	602	if (revents & EVENT_READ)
510	{	603	{
511	/* process data */	604	/* process data */
512	tap_packet *pkt;	605	tap_packet *pkt;
513		606
514	pkt = tap->recv ();	607	pkt = tap->recv ();
515		608
		609	if (!pkt)
		610	return;
		611
		612	if (pkt->len > 14)
		613	{
516	int dst = mac2id (pkt->dst);	614	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	615	int src = mac2id (pkt->src);
518		616
519	if (src != THISNODE->id)	617	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	{	618	{
537	// unicast	619	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	620	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	621	}
		622
		623	if (dst == THISNODE->id)
		624	{
		625	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		626	exit (EXIT_FAILURE);
		627	}
		628
		629	if (dst > conns.size ())
		630	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
541	else	631	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);	632	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	}	633	}
554		634
555	delete pkt;	635	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	}	636	}
562	else	637	else
563	abort ();	638	abort ();
564	}	639	}
565		640
…		…
571	if (events & EVENT_SHUTDOWN)	646	if (events & EVENT_SHUTDOWN)
572	{	647	{
573	slog (L_INFO, _("preparing shutdown..."));	648	slog (L_INFO, _("preparing shutdown..."));
574		649
575	shutdown_all ();	650	shutdown_all ();
576
577	remove_pid (pidfilename);	651	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	652	slog (L_INFO, _("terminating"));
580		653	exit (EXIT_SUCCESS);
581	exit (0);
582	}	654	}
583		655
584	if (events & EVENT_RECONNECT)	656	if (events & EVENT_RECONNECT)
585	{	657	{
586	slog (L_INFO, _("forced reconnect"));	658	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	660	reconnect_all ();
589	}	661	}
590		662
591	events = 0;	663	events = 0;
592	}	664	}
593
594	w.at = TSTAMP_CANCEL;
595	}	665	}
596		666
597	void	667	void
598	vpn::shutdown_all ()	668	vpn::shutdown_all ()
599	{	669	{
…		…
612	connection_init ();	682	connection_init ();
613		683
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	684	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	685	i != conf.nodes.end (); ++i)
616	{	686	{
617	connection *conn = new connection (this);	687	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	688	conns.push_back (conn);
621
622	conn->establish_connection ();	689	conn->establish_connection ();
623	}	690	}
624	}	691	}
625		692
626	connection *vpn::find_router ()	693	connection *vpn::find_router ()
627	{	694	{
628	u32 prio = 0;	695	u32 prio = 1;
629	connection *router = 0;	696	connection *router = 0;
630		697
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	698	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	699	{
633	connection c = i;	700	connection c = i;
634		701
635	if (c->conf->routerprio > prio	702	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	703	&& 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)	704	&& c->ictx && c->octx
		705	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	706	{
640	prio = c->conf->routerprio;	707	prio = c->conf->routerprio;
641	router = c;	708	router = c;
642	}	709	}
643	}	710	}
…		…
652	if (c)	719	if (c)
653	c->send_connect_request (id);	720	c->send_connect_request (id);
654	else	721	else
655	// no router found, aggressively connect to all routers	722	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	723	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	724	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	725	(*i)->establish_connection ();
659	}	726	}
660		727
661	void	728	void
662	connection::dump_status ()	729	connection::dump_status ()
…		…
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	756	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
690	#endif	757	#endif
691	#if ENABLE_ICMP	758	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	759	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693	#endif	760	#endif
		761	#if ENABLE_DNS
		762	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		763	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	764	, tap_ev_watcher (this, &vpn::tap_ev)
695	{	765	{
696	}	766	}
697		767
698	vpn::~vpn ()	768	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs. Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.9 by pcg, Tue Apr 8 02:00:54 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC