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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.34 by pcg, Sat Mar 26 03:16:24 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 <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	33	#include <errno.h>
34	#include <time.h>	34	#include <time.h>
35	#include <unistd.h>	35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <sys/socket.h>
		38
		39	#include "netcompat.h"
36		40
37	#include "pidfile.h"	41	#include "pidfile.h"
38		42
39	#include "connection.h"	43	#include "connection.h"
40	#include "util.h"	44	#include "util.h"
41	#include "vpn.h"	45	#include "vpn.h"
42		46
		47	vpn network; // THE vpn (bad design...)
		48
43	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
44		50
45	const char *vpn::script_if_up ()	51	void
		52	vpn::script_init_env ()
46	{	53	{
47	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		60
54	char *env;	61	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	63	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	64	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		65	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	66	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);	67	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);
68	putenv (env);
69		69
		70	conns [THISNODE->id - 1]->script_init_env ("");
		71
		72	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		73	{
		74	char ext[16];
		75	snprintf (ext, 16, "_%d", (*c)->conf->id);
		76	(*c)->script_init_env (ext);
		77	}
		78	}
		79
		80	const char *vpn::script_if_init ()
		81	{
		82	script_init_env ();
		83
		84	return tap->if_up ();
		85	}
		86
		87	const char *vpn::script_if_up ()
		88	{
		89	script_init_env ();
		90
		91	char *filename;
		92	asprintf (&filename,
		93	"%s/%s",
		94	confbase,
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	95	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		96
		97	return filename;
71	}	98	}
72		99
73	int	100	int
74	vpn::setup ()	101	vpn::setup ()
75	{	102	{
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	107	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		108
82	if (ipv4_fd < 0)	109	if (ipv4_fd < 0)
83	return -1;	110	return -1;
84		111
85	sockinfo si (THISNODE, PROT_IPv4);	112	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
86		113
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	114	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
88	{
89	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90	exit (1);
91	}
92
93	#ifdef IP_MTU_DISCOVER
94	// this I really consider a linux bug. I am neither connected	115	// this I really consider a linux bug. I am neither connected
95	// nor do I fragment myself. Linux still sets DF and doesn't	116	// nor do I fragment myself. Linux still sets DF and doesn't
96	// fragment for me sometimes.	117	// fragment for me sometimes.
97	{	118	{
98	int oval = IP_PMTUDISC_DONT;	119	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	120	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	121	}
101	#endif	122	#endif
102		123
		124	sockinfo si (THISNODE, PROT_IPv4);
		125
		126	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		127	{
		128	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		129	exit (EXIT_FAILURE);
		130	}
		131
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	132	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
104	}	133	}
105		134
106	udpv4_fd = -1;	135	udpv4_fd = -1;
107		136
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	137	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	138	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	139	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		140
112	if (udpv4_fd < 0)	141	if (udpv4_fd < 0)
113	return -1;	142	return -1;
		143
		144	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
114		145
115	// standard daemon practise...	146	// standard daemon practise...
116	{	147	{
117	int oval = 1;	148	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	149	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	150	}
120		151
121	sockinfo si (THISNODE, PROT_UDPv4);	152	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
122
123	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
124	{
125	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
126	exit (1);
127	}
128
129	#ifdef IP_MTU_DISCOVER
130	// this I really consider a linux bug. I am neither connected	153	// this I really consider a linux bug. I am neither connected
131	// nor do I fragment myself. Linux still sets DF and doesn't	154	// nor do I fragment myself. Linux still sets DF and doesn't
132	// fragment for me sometimes.	155	// fragment for me sometimes.
133	{	156	{
134	int oval = IP_PMTUDISC_DONT;	157	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	158	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	159	}
137	#endif	160	#endif
138		161
		162	sockinfo si (THISNODE, PROT_UDPv4);
		163
		164	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		165	{
		166	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		167	exit (EXIT_FAILURE);
		168	}
		169
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	170	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		171	}
		172
		173	icmpv4_fd = -1;
		174
		175	#if ENABLE_ICMP
		176	if (THISNODE->protocols & PROT_ICMPv4)
		177	{
		178	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		179
		180	if (icmpv4_fd < 0)
		181	return -1;
		182
		183	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		184
		185	#ifdef ICMP_FILTER
		186	{
		187	icmp_filter oval;
		188	oval.data = 0xffffffff;
		189	if (::conf.icmp_type < 32)
		190	oval.data &= ~(1 << ::conf.icmp_type);
		191
		192	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
140	}	193	}
		194	#endif
		195
		196	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		197	// this I really consider a linux bug. I am neither connected
		198	// nor do I fragment myself. Linux still sets DF and doesn't
		199	// fragment for me sometimes.
		200	{
		201	int oval = IP_PMTUDISC_DONT;
		202	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		203	}
		204	#endif
		205
		206	sockinfo si (THISNODE, PROT_ICMPv4);
		207
		208	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		209	{
		210	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		211	exit (EXIT_FAILURE);
		212	}
		213
		214	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		215	}
		216	#endif
141		217
142	tcpv4_fd = -1;	218	tcpv4_fd = -1;
143		219
144	#if ENABLE_TCP	220	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	221	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146	{	222	{
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	223	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		224
149	if (tcpv4_fd < 0)	225	if (tcpv4_fd < 0)
150	return -1;	226	return -1;
		227
		228	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
151		229
152	// standard daemon practise...	230	// standard daemon practise...
153	{	231	{
154	int oval = 1;	232	int oval = 1;
155	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	233	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
158	sockinfo si (THISNODE, PROT_TCPv4);	236	sockinfo si (THISNODE, PROT_TCPv4);
159		237
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	238	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	239	{
162	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	240	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
163	exit (1);	241	exit (EXIT_FAILURE);
164	}	242	}
165		243
166	if (listen (tcpv4_fd, 5))	244	if (listen (tcpv4_fd, 5))
167	{	245	{
168	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	246	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
169	exit (1);	247	exit (EXIT_FAILURE);
		248	}
		249
		250	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		251	}
		252	#endif
		253
		254	#if ENABLE_DNS
		255	if (THISNODE->protocols & PROT_DNSv4)
		256	{
		257	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		258
		259	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		260
		261	if (dnsv4_fd < 0)
		262	return -1;
		263
		264	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		265	// this I really consider a linux bug. I am neither connected
		266	// nor do I fragment myself. Linux still sets DF and doesn't
		267	// fragment for me sometimes.
		268	{
		269	int oval = IP_PMTUDISC_DONT;
		270	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		271	}
		272	#endif
		273
		274	// standard daemon practise...
		275	{
		276	int oval = 1;
		277	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		278	}
		279
		280	sockinfo si (THISNODE->dns_hostname,
		281	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		282	PROT_DNSv4);
		283
		284	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
170	}	285	{
		286	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		287	exit (EXIT_FAILURE);
		288	}
171		289
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	290	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
173	}	291	}
174	#endif	292	#endif
		293
		294	/////////////////////////////////////////////////////////////////////////////
		295
		296	reconnect_all ();
		297
		298	/////////////////////////////////////////////////////////////////////////////
175		299
176	tap = new tap_device ();	300	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	301	if (!tap) //D this, of course, never catches
178	{	302	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	303	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
180	exit (1);	304	exit (EXIT_FAILURE);
181	}	305	}
182		306
		307	if (tap->if_up () &&
		308	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		309	{
		310	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		311	tap->if_up ());
		312	exit (EXIT_FAILURE);
		313	}
		314
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	315	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		316	{
		317	slog (L_ERR, _("if-up command execution failed, exiting."));
		318	exit (EXIT_FAILURE);
		319	}
184		320
185	tap_ev_watcher.start (tap->fd, POLLIN);	321	tap_ev_watcher.start (tap->fd, EVENT_READ);
186
187	reconnect_all ();
188		322
189	return 0;	323	return 0;
190	}
191
192	// send a vpn packet out to other hosts
193	bool
194	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
195	{
196	switch (si.prot)
197	{
198	case PROT_IPv4:
199	return send_ipv4_packet (pkt, si, tos);
200
201	case PROT_UDPv4:
202	return send_udpv4_packet (pkt, si, tos);
203
204	#if ENABLE_TCP
205	case PROT_TCPv4:
206	return send_tcpv4_packet (pkt, si, tos);
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	return false;
212	}
213	}	324	}
214		325
215	bool	326	bool
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	327	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	332	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220		333
221	return true;	334	return true;
222	}	335	}
		336
		337	static u16
		338	ipv4_checksum (u16 *data, unsigned int len)
		339	{
		340	// use 32 bit accumulator and fold back carry bits at the end
		341	u32 sum = 0;
		342
		343	while (len > 1)
		344	{
		345	sum += *data++;
		346	len -= 2;
		347	}
		348
		349	// odd byte left?
		350	if (len)
		351	sum += (u8 )data;
		352
		353	// add back carry bits
		354	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		355	sum += (sum >> 16); // carry
		356
		357	return ~sum;
		358	}
		359
		360	#if ENABLE_ICMP
		361	bool
		362	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		363	{
		364	#if defined(SOL_IP) && defined(IP_TOS)
		365	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		366	#endif
		367
		368	pkt->unshift_hdr (4);
		369
		370	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		371	hdr->type = ::conf.icmp_type;
		372	hdr->code = 255;
		373	hdr->checksum = 0;
		374	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		375
		376	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		377
		378	return true;
		379	}
		380	#endif
223		381
224	bool	382	bool
225	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	383	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
226	{	384	{
		385	#if defined(SOL_IP) && defined(IP_TOS)
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	386	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		387	#endif
228	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	388	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
229		389
230	return true;	390	return true;
		391	}
		392
		393	void
		394	vpn::inject_data_packet (tap_packet *pkt, int dst)
		395	{
		396	if (dst)
		397	{
		398	// unicast
		399	if (dst != THISNODE->id)
		400	conns[dst - 1]->inject_data_packet (pkt);
		401	}
		402	else
		403	{
		404	// broadcast, this is ugly, but due to the security policy
		405	// we have to connect to all hosts...
		406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		407	if ((*c)->conf != THISNODE)
		408	(*c)->inject_data_packet (pkt, true);
		409	}
231	}	410	}
232		411
233	void	412	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	413	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	414	{
…		…
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	428	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	429	else
251	{	430	{
252	connection *c = conns[src - 1];	431	connection *c = conns[src - 1];
253		432
254	if (dst == 0 && !THISNODE->routerprio)	433	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	434	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
256	c->conf->nodename, (const char *)rsi);	435	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	436	else if (dst != THISNODE->id)
258	{	437	{
259	if (THISNODE->routerprio)	438	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	439	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	440	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	441	else
…		…
268	else	447	else
269	c->recv_vpn_packet (pkt, rsi);	448	c->recv_vpn_packet (pkt, rsi);
270	}	449	}
271	}	450	}
272		451
		452	bool
		453	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		454	{
		455	switch (si.prot)
		456	{
		457	case PROT_IPv4:
		458	return send_ipv4_packet (pkt, si, tos);
		459	case PROT_UDPv4:
		460	return send_udpv4_packet (pkt, si, tos);
		461	#if ENABLE_TCP
		462	case PROT_TCPv4:
		463	return send_tcpv4_packet (pkt, si, tos);
		464	#endif
		465	#if ENABLE_ICMP
		466	case PROT_ICMPv4:
		467	return send_icmpv4_packet (pkt, si, tos);
		468	#endif
		469	#if ENABLE_DNS
		470	case PROT_DNSv4:
		471	return send_dnsv4_packet (pkt, si, tos);
		472	#endif
		473
		474	default:
		475	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		476	}
		477
		478	return false;
		479	}
		480
273	void	481	void
274	vpn::udpv4_ev (io_watcher &w, short revents)	482	vpn::ipv4_ev (io_watcher &w, short revents)
275	{	483	{
276	if (revents & (POLLIN \| POLLERR))	484	if (revents & EVENT_READ)
277	{	485	{
278	vpn_packet *pkt = new vpn_packet;	486	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	487	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	488	socklen_t sa_len = sizeof (sa);
281	int len;	489	int len;
282		490
283	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	491	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
284		492
285	sockinfo si(sa, PROT_UDPv4);	493	sockinfo si(sa, PROT_IPv4);
286		494
287	if (len > 0)	495	if (len > 0)
288	{	496	{
289	pkt->len = len;	497	pkt->len = len;
290		498
		499	// raw sockets deliver the ipv4 header, but don't expect it on sends
		500	pkt->skip_hdr (IP_OVERHEAD);
		501
291	recv_vpn_packet (pkt, si);	502	recv_vpn_packet (pkt, si);
292	}	503	}
293	else	504	else
294	{	505	{
295	// probably ECONNRESET or somesuch	506	// probably ECONNRESET or somesuch
296	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	507	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
297	}	508	}
298		509
299	delete pkt;	510	delete pkt;
300	}	511	}
301	else if (revents & POLLHUP)
302	{
303	// this cannot ;) happen on udp sockets
304	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
305	exit (1);
306	}
307	else	512	else
308	{	513	{
309	slog (L_ERR,	514	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	515	_("FATAL: unknown revents %08x in socket, terminating\n"),
311	revents);	516	revents);
312	exit (1);	517	exit (EXIT_FAILURE);
313	}	518	}
314	}	519	}
315		520
		521	#if ENABLE_ICMP
316	void	522	void
317	vpn::ipv4_ev (io_watcher &w, short revents)	523	vpn::icmpv4_ev (io_watcher &w, short revents)
318	{	524	{
319	if (revents & (POLLIN \| POLLERR))	525	if (revents & EVENT_READ)
320	{	526	{
321	vpn_packet *pkt = new vpn_packet;	527	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	528	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	529	socklen_t sa_len = sizeof (sa);
324	int len;	530	int len;
325		531
326	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	532	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
327		533
328	sockinfo si(sa, PROT_IPv4);	534	sockinfo si(sa, PROT_ICMPv4);
329		535
330	if (len > 0)	536	if (len > 0)
331	{	537	{
332	pkt->len = len;	538	pkt->len = len;
333		539
		540	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		541
		542	if (hdr->type == ::conf.icmp_type
		543	&& hdr->code == 255)
		544	{
334	// raw sockets deliver the ipv4, but don't expect it on sends	545	// raw sockets deliver the ipv4, but don't expect it on sends
335	// this is slow, but...	546	// this is slow, but...
336	pkt->skip_hdr (IP_OVERHEAD);	547	pkt->skip_hdr (ICMP_OVERHEAD);
337		548
338	recv_vpn_packet (pkt, si);	549	recv_vpn_packet (pkt, si);
		550	}
339	}	551	}
340	else	552	else
341	{	553	{
342	// probably ECONNRESET or somesuch	554	// probably ECONNRESET or somesuch
343	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	555	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
344	}	556	}
345		557
346	delete pkt;	558	delete pkt;
347	}
348	else if (revents & POLLHUP)
349	{
350	// this cannot ;) happen on udp sockets
351	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
352	exit (1);
353	}	559	}
354	else	560	else
355	{	561	{
356	slog (L_ERR,	562	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	563	_("FATAL: unknown revents %08x in socket, terminating\n"),
358	revents);	564	revents);
359	exit (1);	565	exit (EXIT_FAILURE);
		566	}
		567	}
		568	#endif
		569
		570	void
		571	vpn::udpv4_ev (io_watcher &w, short revents)
		572	{
		573	if (revents & EVENT_READ)
		574	{
		575	vpn_packet *pkt = new vpn_packet;
		576	struct sockaddr_in sa;
		577	socklen_t sa_len = sizeof (sa);
		578	int len;
		579
		580	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		581
		582	sockinfo si(sa, PROT_UDPv4);
		583
		584	if (len > 0)
		585	{
		586	pkt->len = len;
		587
		588	recv_vpn_packet (pkt, si);
		589	}
		590	else
		591	{
		592	// probably ECONNRESET or somesuch
		593	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		594	}
		595
		596	delete pkt;
		597	}
		598	else
		599	{
		600	slog (L_ERR,
		601	_("FATAL: unknown revents %08x in socket, terminating\n"),
		602	revents);
		603	exit (EXIT_FAILURE);
360	}	604	}
361	}	605	}
362		606
363	void	607	void
364	vpn::tap_ev (io_watcher &w, short revents)	608	vpn::tap_ev (io_watcher &w, short revents)
365	{	609	{
366	if (revents & POLLIN)	610	if (revents & EVENT_READ)
367	{	611	{
368	/* process data */	612	/* process data */
369	tap_packet *pkt;	613	tap_packet *pkt;
370		614
371	pkt = tap->recv ();	615	pkt = tap->recv ();
372		616
		617	if (!pkt)
		618	return;
		619
		620	if (pkt->len > 14)
		621	{
373	int dst = mac2id (pkt->dst);	622	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	623	int src = mac2id (pkt->src);
375		624
376	if (src != THISNODE->id)	625	if (src != THISNODE->id)
377	{
378	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
379	exit (1);
380	}
381
382	if (dst == THISNODE->id)
383	{
384	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
385	exit (1);
386	}
387
388	if (dst > conns.size ())
389	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
390	else
391	{
392	if (dst)
393	{	626	{
394	// unicast	627	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
395	if (dst != THISNODE->id)	628	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	629	}
		630
		631	if (dst == THISNODE->id)
		632	{
		633	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		634	exit (EXIT_FAILURE);
		635	}
		636
		637	if (dst > conns.size ())
		638	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
398	else	639	else
399	{
400	// broadcast, first check router, then self, then english
401	connection *router = find_router ();
402
403	if (router)
404	router->inject_data_packet (pkt, true);	640	inject_data_packet (pkt, dst);
405	else
406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
407	if ((*c)->conf != THISNODE)
408	(*c)->inject_data_packet (pkt);
409	}
410	}	641	}
411		642
412	delete pkt;	643	delete pkt;
413	}
414	else if (revents & (POLLHUP \| POLLERR))
415	{
416	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
417	exit (1);
418	}	644	}
419	else	645	else
420	abort ();	646	abort ();
421	}	647	}
422		648
…		…
428	if (events & EVENT_SHUTDOWN)	654	if (events & EVENT_SHUTDOWN)
429	{	655	{
430	slog (L_INFO, _("preparing shutdown..."));	656	slog (L_INFO, _("preparing shutdown..."));
431		657
432	shutdown_all ();	658	shutdown_all ();
433
434	remove_pid (pidfilename);	659	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	660	slog (L_INFO, _("terminating"));
437		661	exit (EXIT_SUCCESS);
438	exit (0);
439	}	662	}
440		663
441	if (events & EVENT_RECONNECT)	664	if (events & EVENT_RECONNECT)
442	{	665	{
443	slog (L_INFO, _("forced reconnect"));	666	slog (L_INFO, _("forced reconnect"));
…		…
445	reconnect_all ();	668	reconnect_all ();
446	}	669	}
447		670
448	events = 0;	671	events = 0;
449	}	672	}
450
451	w.at = TSTAMP_CANCEL;
452	}	673	}
453		674
454	void	675	void
455	vpn::shutdown_all ()	676	vpn::shutdown_all ()
456	{	677	{
…		…
469	connection_init ();	690	connection_init ();
470		691
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	692	for (configuration::node_vector::iterator i = conf.nodes.begin ();
472	i != conf.nodes.end (); ++i)	693	i != conf.nodes.end (); ++i)
473	{	694	{
474	connection *conn = new connection (this);	695	connection conn = new connection (this, i);
475
476	conn->conf = *i;
477	conns.push_back (conn);	696	conns.push_back (conn);
478
479	conn->establish_connection ();	697	conn->establish_connection ();
480	}	698	}
481	}	699	}
482		700
483	connection *vpn::find_router ()	701	connection *vpn::find_router ()
484	{	702	{
485	u32 prio = 0;	703	u32 prio = 1;
486	connection *router = 0;	704	connection *router = 0;
487		705
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	706	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	707	{
490	connection c = i;	708	connection c = i;
491		709
492	if (c->conf->routerprio > prio	710	if (c->conf->routerprio > prio
493	&& c->connectmode == conf_node::C_ALWAYS	711	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
494	&& c->conf != THISNODE
495	&& c->ictx && c->octx)	712	&& c->ictx && c->octx
		713	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
496	{	714	{
497	prio = c->conf->routerprio;	715	prio = c->conf->routerprio;
498	router = c;	716	router = c;
499	}	717	}
500	}	718	}
…		…
509	if (c)	727	if (c)
510	c->send_connect_request (id);	728	c->send_connect_request (id);
511	else	729	else
512	// no router found, aggressively connect to all routers	730	// no router found, aggressively connect to all routers
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
514	if ((*i)->conf->routerprio)	732	if ((i)->conf->routerprio && (i)->conf != THISNODE)
515	(*i)->establish_connection ();	733	(*i)->establish_connection ();
516	}	734	}
517		735
518	void	736	void
519	connection::dump_status ()	737	connection::dump_status ()
…		…
537		755
538	slog (L_NOTICE, _("END status dump"));	756	slog (L_NOTICE, _("END status dump"));
539	}	757	}
540		758
541	vpn::vpn (void)	759	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	760	: event (this, &vpn::event_cb)
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	761	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	762	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	763	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	764	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
548	#endif	765	#endif
		766	#if ENABLE_ICMP
		767	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		768	#endif
		769	#if ENABLE_DNS
		770	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		771	#endif
		772	, tap_ev_watcher (this, &vpn::tap_ev)
549	{	773	{
550	}	774	}
551		775
552	vpn::~vpn ()	776	vpn::~vpn ()
553	{	777	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs. Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.34 by pcg, Sat Mar 26 03:16:24 2005 UTC