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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 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 <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"
		46
		47	vpn network; // THE vpn (bad design...)
42		48
43	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
44		50
45	const char *vpn::script_if_up ()	51	const char *vpn::script_if_up ()
46	{	52	{
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		59
54	char *env;	60	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
68	putenv (env);	71	putenv (env);
69		72
…		…
71	}	74	}
72		75
73	int	76	int
74	vpn::setup ()	77	vpn::setup ()
75	{	78	{
		79	ipv4_fd = -1;
		80
		81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		82	{
		83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		84
		85	if (ipv4_fd < 0)
		86	return -1;
		87
		88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		91	// this I really consider a linux bug. I am neither connected
		92	// nor do I fragment myself. Linux still sets DF and doesn't
		93	// fragment for me sometimes.
		94	{
		95	int oval = IP_PMTUDISC_DONT;
		96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		97	}
		98	#endif
		99
		100	sockinfo si (THISNODE, PROT_IPv4);
		101
		102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		103	{
		104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		105	exit (EXIT_FAILURE);
		106	}
		107
		108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		109	}
		110
76	udpv4_fd = -1;	111	udpv4_fd = -1;
77		112
78	if (THISNODE->protocols & PROT_UDPv4)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	114	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		116
82	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
83	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
84		121
85	// standard daemon practise...	122	// standard daemon practise...
86	{	123	{
87	int oval = 1;	124	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	126	}
90		127
91	sockinfo si (THISNODE, PROT_UDPv4);	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92
93	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
94	{
95	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
96	exit (1);
97	}
98
99	#ifdef IP_MTU_DISCOVER
100	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
101	// 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
102	// fragment for me sometimes.	131	// fragment for me sometimes.
103	{	132	{
104	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	135	}
107	#endif	136	#endif
108		137
		138	sockinfo si (THISNODE, PROT_UDPv4);
		139
		140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
110	}	147	}
111		148
112	ipv4_fd = -1;	149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	152	if (THISNODE->protocols & PROT_ICMPv4)
114	{	153	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		155
117	if (ipv4_fd < 0)	156	if (icmpv4_fd < 0)
118	return -1;	157	return -1;
119		158
120	sockinfo si (THISNODE, PROT_IPv4);	159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
121		160
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	161	#ifdef ICMP_FILTER
123	{	162	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	163	icmp_filter oval;
125	exit (1);	164	oval.data = 0xffffffff;
		165	if (::conf.icmp_type < 32)
		166	oval.data &= ~(1 << ::conf.icmp_type);
		167
		168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	169	}
		170	#endif
127		171
128	#ifdef IP_MTU_DISCOVER	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
130	// 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
131	// fragment for me sometimes.	175	// fragment for me sometimes.
132	{	176	{
133	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	179	}
136	#endif	180	#endif
137		181
		182	sockinfo si (THISNODE, PROT_ICMPv4);
		183
		184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		185	{
		186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		187	exit (EXIT_FAILURE);
		188	}
		189
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
139	}	191	}
		192	#endif
		193
		194	tcpv4_fd = -1;
140		195
141	#if ENABLE_TCP	196	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	198	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		200
146	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
147	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
148		205
149	// standard daemon practise...	206	// standard daemon practise...
150	{	207	{
151	int oval = 1;	208	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
155	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
156		213
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	215	{
159	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));
160	exit (1);	217	exit (EXIT_FAILURE);
161	}	218	}
162		219
163	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
164	{	221	{
165	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));
166	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 ()))
167	}	251	{
		252	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		253	exit (EXIT_FAILURE);
		254	}
168		255
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	256	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
170	}	257	}
171	#endif	258	#endif
172		259
173	tap = new tap_device ();	260	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	261	if (!tap) //D this, of course, never catches
175	{	262	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	263	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	264	exit (EXIT_FAILURE);
178	}	265	}
179		266
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	267	run_script (run_script_cb (this, &vpn::script_if_up), true);
181		268
182	tap_ev_watcher.start (tap->fd, POLLIN);	269	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		270
184	reconnect_all ();	271	reconnect_all ();
185		272
186	return 0;	273	return 0;
187	}	274	}
188		275
189	// send a vpn packet out to other hosts	276	bool
190	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);
197	break;
198
199	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);
201	break;
202
203	#if ENABLE_TCP
204	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);
206	break;
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();
212	}
213	}
214
215	void
216	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)
217	{	278	{
		279	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	280	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		281	#endif
219	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 ());
220	}
221		283
222	void	284	return true;
		285	}
		286
		287	static u16
		288	ipv4_checksum (u16 *data, unsigned int len)
		289	{
		290	// use 32 bit accumulator and fold back carry bits at the end
		291	u32 sum = 0;
		292
		293	while (len > 1)
		294	{
		295	sum += *data++;
		296	len -= 2;
		297	}
		298
		299	// odd byte left?
		300	if (len)
		301	sum += (u8 )data;
		302
		303	// add back carry bits
		304	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		305	sum += (sum >> 16); // carry
		306
		307	return ~sum;
		308	}
		309
		310	#if ENABLE_ICMP
		311	bool
		312	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		313	{
		314	#if defined(SOL_IP) && defined(IP_TOS)
		315	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		316	#endif
		317
		318	pkt->unshift_hdr (4);
		319
		320	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		321	hdr->type = ::conf.icmp_type;
		322	hdr->code = 255;
		323	hdr->checksum = 0;
		324	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		325
		326	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		327
		328	return true;
		329	}
		330	#endif
		331
		332	bool
223	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)
224	{	334	{
		335	#if defined(SOL_IP) && defined(IP_TOS)
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	336	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		337	#endif
226	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 ());
		339
		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	}
227	}	360	}
228		361
229	void	362	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	363	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	364	{
…		…
245	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	378	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
246	else	379	else
247	{	380	{
248	connection *c = conns[src - 1];	381	connection *c = conns[src - 1];
249		382
250	if (dst == 0 && !THISNODE->routerprio)	383	if (dst == 0)
251	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	384	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
252	c->conf->nodename, (const char *)rsi);	385	c->conf->nodename, (const char *)rsi);
253	else if (dst != 0 && dst != THISNODE->id)	386	else if (dst != THISNODE->id)
254	{	387	{
255	if (THISNODE->routerprio)	388	if (THISNODE->routerprio)
256	// the tos setting gets lost here. who cares.	389	// the tos setting gets lost here. who cares.
257	conns[dst - 1]->inject_vpn_packet (pkt);	390	conns[dst - 1]->inject_vpn_packet (pkt);
258	else	391	else
…		…
264	else	397	else
265	c->recv_vpn_packet (pkt, rsi);	398	c->recv_vpn_packet (pkt, rsi);
266	}	399	}
267	}	400	}
268		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
269	void	431	void
270	vpn::udpv4_ev (io_watcher &w, short revents)	432	vpn::ipv4_ev (io_watcher &w, short revents)
271	{	433	{
272	if (revents & (POLLIN \| POLLERR))	434	if (revents & EVENT_READ)
273	{	435	{
274	vpn_packet *pkt = new vpn_packet;	436	vpn_packet *pkt = new vpn_packet;
275	struct sockaddr_in sa;	437	struct sockaddr_in sa;
276	socklen_t sa_len = sizeof (sa);	438	socklen_t sa_len = sizeof (sa);
277	int len;	439	int len;
278		440
279	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	441	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
280		442
281	sockinfo si(sa, PROT_UDPv4);	443	sockinfo si(sa, PROT_IPv4);
282		444
283	if (len > 0)	445	if (len > 0)
284	{	446	{
285	pkt->len = len;	447	pkt->len = len;
286		448
		449	// raw sockets deliver the ipv4 header, but don't expect it on sends
		450	pkt->skip_hdr (IP_OVERHEAD);
		451
287	recv_vpn_packet (pkt, si);	452	recv_vpn_packet (pkt, si);
288	}	453	}
289	else	454	else
290	{	455	{
291	// probably ECONNRESET or somesuch	456	// probably ECONNRESET or somesuch
292	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	457	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
293	}	458	}
294		459
295	delete pkt;	460	delete pkt;
296	}	461	}
297	else if (revents & POLLHUP)
298	{
299	// this cannot ;) happen on udp sockets
300	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
301	exit (1);
302	}
303	else	462	else
304	{	463	{
305	slog (L_ERR,	464	slog (L_ERR,
306	_("FATAL: unknown revents %08x in socket, terminating\n"),	465	_("FATAL: unknown revents %08x in socket, terminating\n"),
307	revents);	466	revents);
308	exit (1);	467	exit (EXIT_FAILURE);
309	}	468	}
310	}	469	}
311		470
		471	#if ENABLE_ICMP
312	void	472	void
313	vpn::ipv4_ev (io_watcher &w, short revents)	473	vpn::icmpv4_ev (io_watcher &w, short revents)
314	{	474	{
315	if (revents & (POLLIN \| POLLERR))	475	if (revents & EVENT_READ)
316	{	476	{
317	vpn_packet *pkt = new vpn_packet;	477	vpn_packet *pkt = new vpn_packet;
318	struct sockaddr_in sa;	478	struct sockaddr_in sa;
319	socklen_t sa_len = sizeof (sa);	479	socklen_t sa_len = sizeof (sa);
320	int len;	480	int len;
321		481
322	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	482	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
323		483
324	sockinfo si(sa, PROT_IPv4);	484	sockinfo si(sa, PROT_ICMPv4);
325		485
326	if (len > 0)	486	if (len > 0)
327	{	487	{
328	pkt->len = len;	488	pkt->len = len;
329		489
		490	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		491
		492	if (hdr->type == ::conf.icmp_type
		493	&& hdr->code == 255)
		494	{
330	// 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
331	// this is slow, but...	496	// this is slow, but...
332	pkt->skip_hdr (IP_OVERHEAD);	497	pkt->skip_hdr (ICMP_OVERHEAD);
333		498
334	recv_vpn_packet (pkt, si);	499	recv_vpn_packet (pkt, si);
		500	}
335	}	501	}
336	else	502	else
337	{	503	{
338	// probably ECONNRESET or somesuch	504	// probably ECONNRESET or somesuch
339	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	505	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
340	}	506	}
341		507
342	delete pkt;	508	delete pkt;
343	}
344	else if (revents & POLLHUP)
345	{
346	// this cannot ;) happen on udp sockets
347	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
348	exit (1);
349	}	509	}
350	else	510	else
351	{	511	{
352	slog (L_ERR,	512	slog (L_ERR,
353	_("FATAL: unknown revents %08x in socket, terminating\n"),	513	_("FATAL: unknown revents %08x in socket, terminating\n"),
354	revents);	514	revents);
355	exit (1);	515	exit (EXIT_FAILURE);
		516	}
		517	}
		518	#endif
		519
		520	void
		521	vpn::udpv4_ev (io_watcher &w, short revents)
		522	{
		523	if (revents & EVENT_READ)
		524	{
		525	vpn_packet *pkt = new vpn_packet;
		526	struct sockaddr_in sa;
		527	socklen_t sa_len = sizeof (sa);
		528	int len;
		529
		530	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		531
		532	sockinfo si(sa, PROT_UDPv4);
		533
		534	if (len > 0)
		535	{
		536	pkt->len = len;
		537
		538	recv_vpn_packet (pkt, si);
		539	}
		540	else
		541	{
		542	// probably ECONNRESET or somesuch
		543	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		544	}
		545
		546	delete pkt;
		547	}
		548	else
		549	{
		550	slog (L_ERR,
		551	_("FATAL: unknown revents %08x in socket, terminating\n"),
		552	revents);
		553	exit (EXIT_FAILURE);
356	}	554	}
357	}	555	}
358		556
359	void	557	void
360	vpn::tap_ev (io_watcher &w, short revents)	558	vpn::tap_ev (io_watcher &w, short revents)
361	{	559	{
362	if (revents & POLLIN)	560	if (revents & EVENT_READ)
363	{	561	{
364	/* process data */	562	/* process data */
365	tap_packet *pkt;	563	tap_packet *pkt;
366		564
367	pkt = tap->recv ();	565	pkt = tap->recv ();
368		566
		567	if (!pkt)
		568	return;
		569
		570	if (pkt->len > 14)
		571	{
369	int dst = mac2id (pkt->dst);	572	int dst = mac2id (pkt->dst);
370	int src = mac2id (pkt->src);	573	int src = mac2id (pkt->src);
371		574
372	if (src != THISNODE->id)	575	if (src != THISNODE->id)
373	{
374	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
375	exit (1);
376	}
377
378	if (dst == THISNODE->id)
379	{
380	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
381	exit (1);
382	}
383
384	if (dst > conns.size ())
385	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
386	else
387	{
388	if (dst)
389	{	576	{
390	// unicast	577	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
391	if (dst != THISNODE->id)	578	exit (EXIT_FAILURE);
392	conns[dst - 1]->inject_data_packet (pkt);
393	}	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);
394	else	589	else
395	{
396	// broadcast, first check router, then self, then english
397	connection *router = find_router ();
398
399	if (router)
400	router->inject_data_packet (pkt, true);	590	inject_data_packet (pkt, dst);
401	else
402	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
403	if ((*c)->conf != THISNODE)
404	(*c)->inject_data_packet (pkt);
405	}
406	}	591	}
407		592
408	delete pkt;	593	delete pkt;
409	}
410	else if (revents & (POLLHUP \| POLLERR))
411	{
412	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
413	exit (1);
414	}	594	}
415	else	595	else
416	abort ();	596	abort ();
417	}	597	}
418		598
…		…
424	if (events & EVENT_SHUTDOWN)	604	if (events & EVENT_SHUTDOWN)
425	{	605	{
426	slog (L_INFO, _("preparing shutdown..."));	606	slog (L_INFO, _("preparing shutdown..."));
427		607
428	shutdown_all ();	608	shutdown_all ();
429
430	remove_pid (pidfilename);	609	remove_pid (conf.pidfilename);
431
432	slog (L_INFO, _("terminating"));	610	slog (L_INFO, _("terminating"));
433		611	exit (EXIT_SUCCESS);
434	exit (0);
435	}	612	}
436		613
437	if (events & EVENT_RECONNECT)	614	if (events & EVENT_RECONNECT)
438	{	615	{
439	slog (L_INFO, _("forced reconnect"));	616	slog (L_INFO, _("forced reconnect"));
…		…
441	reconnect_all ();	618	reconnect_all ();
442	}	619	}
443		620
444	events = 0;	621	events = 0;
445	}	622	}
446
447	w.at = TSTAMP_CANCEL;
448	}	623	}
449		624
450	void	625	void
451	vpn::shutdown_all ()	626	vpn::shutdown_all ()
452	{	627	{
…		…
465	connection_init ();	640	connection_init ();
466		641
467	for (configuration::node_vector::iterator i = conf.nodes.begin ();	642	for (configuration::node_vector::iterator i = conf.nodes.begin ();
468	i != conf.nodes.end (); ++i)	643	i != conf.nodes.end (); ++i)
469	{	644	{
470	connection *conn = new connection (this);	645	connection conn = new connection (this, i);
471
472	conn->conf = *i;
473	conns.push_back (conn);	646	conns.push_back (conn);
474
475	conn->establish_connection ();	647	conn->establish_connection ();
476	}	648	}
477	}	649	}
478		650
479	connection *vpn::find_router ()	651	connection *vpn::find_router ()
480	{	652	{
481	u32 prio = 0;	653	u32 prio = 1;
482	connection *router = 0;	654	connection *router = 0;
483		655
484	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
485	{	657	{
486	connection c = i;	658	connection c = i;
487		659
488	if (c->conf->routerprio > prio	660	if (c->conf->routerprio > prio
489	&& c->connectmode == conf_node::C_ALWAYS	661	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
490	&& c->conf != THISNODE
491	&& c->ictx && c->octx)	662	&& c->ictx && c->octx
		663	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
492	{	664	{
493	prio = c->conf->routerprio;	665	prio = c->conf->routerprio;
494	router = c;	666	router = c;
495	}	667	}
496	}	668	}
497		669
498	return router;	670	return router;
499	}	671	}
500		672
501	void vpn::connect_request (int id)	673	void vpn::send_connect_request (int id)
502	{	674	{
503	connection *c = find_router ();	675	connection *c = find_router ();
504		676
505	if (c)	677	if (c)
506	c->connect_request (id);	678	c->send_connect_request (id);
507	//else // does not work, because all others must connect to the same router	679	else
508	// // no router found, aggressively connect to all routers	680	// no router found, aggressively connect to all routers
509	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	681	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
510	// if ((*i)->conf->routerprio)	682	if ((i)->conf->routerprio && (i)->conf != THISNODE)
511	// (*i)->establish_connection ();	683	(*i)->establish_connection ();
512	}	684	}
513		685
514	void	686	void
515	connection::dump_status ()	687	connection::dump_status ()
516	{	688	{
…		…
533		705
534	slog (L_NOTICE, _("END status dump"));	706	slog (L_NOTICE, _("END status dump"));
535	}	707	}
536		708
537	vpn::vpn (void)	709	vpn::vpn (void)
538	: event(this, &vpn::event_cb)	710	: event (this, &vpn::event_cb)
539	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	711	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
540	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	712	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
541	, tap_ev_watcher (this, &vpn::tap_ev)
542	#if ENABLE_TCP	713	#if ENABLE_TCP
543	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	714	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
544	#endif	715	#endif
		716	#if ENABLE_ICMP
		717	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		718	#endif
		719	#if ENABLE_DNS
		720	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		721	#endif
		722	, tap_ev_watcher (this, &vpn::tap_ev)
545	{	723	{
546	}	724	}
547		725
548	vpn::~vpn ()	726	vpn::~vpn ()
549	{	727	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC