[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 1.32 by pcg, Mon Mar 7 01:31:26 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
…		…
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		84
82	if (ipv4_fd < 0)	85	if (ipv4_fd < 0)
83	return -1;	86	return -1;
84		87
85	sockinfo si (THISNODE, PROT_IPv4);	88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
86		89
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	90	#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	91	// this I really consider a linux bug. I am neither connected
95	// 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
96	// fragment for me sometimes.	93	// fragment for me sometimes.
97	{	94	{
98	int oval = IP_PMTUDISC_DONT;	95	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	97	}
101	#endif	98	#endif
102		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
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
104	}	109	}
105		110
106	udpv4_fd = -1;	111	udpv4_fd = -1;
107		112
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	114	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		116
112	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
113	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
114		121
115	// standard daemon practise...	122	// standard daemon practise...
116	{	123	{
117	int oval = 1;	124	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	126	}
120		127
121	sockinfo si (THISNODE, PROT_UDPv4);	128	#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	129	// this I really consider a linux bug. I am neither connected
131	// 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
132	// fragment for me sometimes.	131	// fragment for me sometimes.
133	{	132	{
134	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	135	}
137	#endif	136	#endif
138		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
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		147	}
		148
		149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
		152	if (THISNODE->protocols & PROT_ICMPv4)
		153	{
		154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		155
		156	if (icmpv4_fd < 0)
		157	return -1;
		158
		159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		160
		161	#ifdef ICMP_FILTER
		162	{
		163	icmp_filter oval;
		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);
140	}	169	}
		170	#endif
		171
		172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		173	// this I really consider a linux bug. I am neither connected
		174	// nor do I fragment myself. Linux still sets DF and doesn't
		175	// fragment for me sometimes.
		176	{
		177	int oval = IP_PMTUDISC_DONT;
		178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		179	}
		180	#endif
		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
		190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		191	}
		192	#endif
141		193
142	tcpv4_fd = -1;	194	tcpv4_fd = -1;
143		195
144	#if ENABLE_TCP	196	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146	{	198	{
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		200
149	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
150	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
151		205
152	// standard daemon practise...	206	// standard daemon practise...
153	{	207	{
154	int oval = 1;	208	int oval = 1;
155	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
158	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
159		213
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	215	{
162	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));
163	exit (1);	217	exit (EXIT_FAILURE);
164	}	218	}
165		219
166	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
167	{	221	{
168	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));
169	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	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		241	// this I really consider a linux bug. I am neither connected
		242	// nor do I fragment myself. Linux still sets DF and doesn't
		243	// fragment for me sometimes.
		244	{
		245	int oval = IP_PMTUDISC_DONT;
		246	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		247	}
		248	#endif
		249
		250	// standard daemon practise...
		251	{
		252	int oval = 1;
		253	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		254	}
		255
		256	sockinfo si (THISNODE->dns_hostname,
		257	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		258	PROT_DNSv4);
		259
		260	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
170	}	261	{
		262	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		263	exit (EXIT_FAILURE);
		264	}
171		265
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	266	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
173	}	267	}
174	#endif	268	#endif
175		269
176	tap = new tap_device ();	270	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	271	if (!tap) //D this, of course, never catches
178	{	272	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	273	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
180	exit (1);	274	exit (EXIT_FAILURE);
181	}	275	}
182		276
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	277	run_script (run_script_cb (this, &vpn::script_if_up), true);
184		278
185	tap_ev_watcher.start (tap->fd, POLLIN);	279	tap_ev_watcher.start (tap->fd, EVENT_READ);
186		280
187	reconnect_all ();	281	reconnect_all ();
188		282
189	return 0;	283	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	}	284	}
214		285
215	bool	286	bool
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	287	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	288	{
		289	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	290	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		291	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	292	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220		293
221	return true;	294	return true;
222	}	295	}
		296
		297	static u16
		298	ipv4_checksum (u16 *data, unsigned int len)
		299	{
		300	// use 32 bit accumulator and fold back carry bits at the end
		301	u32 sum = 0;
		302
		303	while (len > 1)
		304	{
		305	sum += *data++;
		306	len -= 2;
		307	}
		308
		309	// odd byte left?
		310	if (len)
		311	sum += (u8 )data;
		312
		313	// add back carry bits
		314	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		315	sum += (sum >> 16); // carry
		316
		317	return ~sum;
		318	}
		319
		320	#if ENABLE_ICMP
		321	bool
		322	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		323	{
		324	#if defined(SOL_IP) && defined(IP_TOS)
		325	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		326	#endif
		327
		328	pkt->unshift_hdr (4);
		329
		330	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		331	hdr->type = ::conf.icmp_type;
		332	hdr->code = 255;
		333	hdr->checksum = 0;
		334	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		335
		336	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		337
		338	return true;
		339	}
		340	#endif
223		341
224	bool	342	bool
225	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	343	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
226	{	344	{
		345	#if defined(SOL_IP) && defined(IP_TOS)
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	346	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		347	#endif
228	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	348	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
229		349
230	return true;	350	return true;
		351	}
		352
		353	void
		354	vpn::inject_data_packet (tap_packet *pkt, int dst)
		355	{
		356	if (dst)
		357	{
		358	// unicast
		359	if (dst != THISNODE->id)
		360	conns[dst - 1]->inject_data_packet (pkt);
		361	}
		362	else
		363	{
		364	// broadcast, this is ugly, but due to the security policy
		365	// we have to connect to all hosts...
		366	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		367	if ((*c)->conf != THISNODE)
		368	(*c)->inject_data_packet (pkt, true);
		369	}
231	}	370	}
232		371
233	void	372	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	373	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	374	{
…		…
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	388	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	389	else
251	{	390	{
252	connection *c = conns[src - 1];	391	connection *c = conns[src - 1];
253		392
254	if (dst == 0 && !THISNODE->routerprio)	393	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	394	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
256	c->conf->nodename, (const char *)rsi);	395	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	396	else if (dst != THISNODE->id)
258	{	397	{
259	if (THISNODE->routerprio)	398	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	399	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	400	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	401	else
…		…
268	else	407	else
269	c->recv_vpn_packet (pkt, rsi);	408	c->recv_vpn_packet (pkt, rsi);
270	}	409	}
271	}	410	}
272		411
		412	bool
		413	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		414	{
		415	switch (si.prot)
		416	{
		417	case PROT_IPv4:
		418	return send_ipv4_packet (pkt, si, tos);
		419	case PROT_UDPv4:
		420	return send_udpv4_packet (pkt, si, tos);
		421	#if ENABLE_TCP
		422	case PROT_TCPv4:
		423	return send_tcpv4_packet (pkt, si, tos);
		424	#endif
		425	#if ENABLE_ICMP
		426	case PROT_ICMPv4:
		427	return send_icmpv4_packet (pkt, si, tos);
		428	#endif
		429	#if ENABLE_DNS
		430	case PROT_DNSv4:
		431	return send_dnsv4_packet (pkt, si, tos);
		432	#endif
		433
		434	default:
		435	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		436	}
		437
		438	return false;
		439	}
		440
273	void	441	void
274	vpn::udpv4_ev (io_watcher &w, short revents)	442	vpn::ipv4_ev (io_watcher &w, short revents)
275	{	443	{
276	if (revents & (POLLIN \| POLLERR))	444	if (revents & EVENT_READ)
277	{	445	{
278	vpn_packet *pkt = new vpn_packet;	446	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	447	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	448	socklen_t sa_len = sizeof (sa);
281	int len;	449	int len;
282		450
283	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	451	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
284		452
285	sockinfo si(sa, PROT_UDPv4);	453	sockinfo si(sa, PROT_IPv4);
286		454
287	if (len > 0)	455	if (len > 0)
288	{	456	{
289	pkt->len = len;	457	pkt->len = len;
290		458
		459	// raw sockets deliver the ipv4 header, but don't expect it on sends
		460	pkt->skip_hdr (IP_OVERHEAD);
		461
291	recv_vpn_packet (pkt, si);	462	recv_vpn_packet (pkt, si);
292	}	463	}
293	else	464	else
294	{	465	{
295	// probably ECONNRESET or somesuch	466	// probably ECONNRESET or somesuch
296	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	467	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
297	}	468	}
298		469
299	delete pkt;	470	delete pkt;
300	}	471	}
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	472	else
308	{	473	{
309	slog (L_ERR,	474	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	475	_("FATAL: unknown revents %08x in socket, terminating\n"),
311	revents);	476	revents);
312	exit (1);	477	exit (EXIT_FAILURE);
313	}	478	}
314	}	479	}
315		480
		481	#if ENABLE_ICMP
316	void	482	void
317	vpn::ipv4_ev (io_watcher &w, short revents)	483	vpn::icmpv4_ev (io_watcher &w, short revents)
318	{	484	{
319	if (revents & (POLLIN \| POLLERR))	485	if (revents & EVENT_READ)
320	{	486	{
321	vpn_packet *pkt = new vpn_packet;	487	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	488	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	489	socklen_t sa_len = sizeof (sa);
324	int len;	490	int len;
325		491
326	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	492	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
327		493
328	sockinfo si(sa, PROT_IPv4);	494	sockinfo si(sa, PROT_ICMPv4);
329		495
330	if (len > 0)	496	if (len > 0)
331	{	497	{
332	pkt->len = len;	498	pkt->len = len;
333		499
		500	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		501
		502	if (hdr->type == ::conf.icmp_type
		503	&& hdr->code == 255)
		504	{
334	// raw sockets deliver the ipv4, but don't expect it on sends	505	// raw sockets deliver the ipv4, but don't expect it on sends
335	// this is slow, but...	506	// this is slow, but...
336	pkt->skip_hdr (IP_OVERHEAD);	507	pkt->skip_hdr (ICMP_OVERHEAD);
337		508
338	recv_vpn_packet (pkt, si);	509	recv_vpn_packet (pkt, si);
		510	}
339	}	511	}
340	else	512	else
341	{	513	{
342	// probably ECONNRESET or somesuch	514	// probably ECONNRESET or somesuch
343	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	515	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
344	}	516	}
345		517
346	delete pkt;	518	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	}	519	}
354	else	520	else
355	{	521	{
356	slog (L_ERR,	522	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	523	_("FATAL: unknown revents %08x in socket, terminating\n"),
358	revents);	524	revents);
359	exit (1);	525	exit (EXIT_FAILURE);
		526	}
		527	}
		528	#endif
		529
		530	void
		531	vpn::udpv4_ev (io_watcher &w, short revents)
		532	{
		533	if (revents & EVENT_READ)
		534	{
		535	vpn_packet *pkt = new vpn_packet;
		536	struct sockaddr_in sa;
		537	socklen_t sa_len = sizeof (sa);
		538	int len;
		539
		540	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		541
		542	sockinfo si(sa, PROT_UDPv4);
		543
		544	if (len > 0)
		545	{
		546	pkt->len = len;
		547
		548	recv_vpn_packet (pkt, si);
		549	}
		550	else
		551	{
		552	// probably ECONNRESET or somesuch
		553	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		554	}
		555
		556	delete pkt;
		557	}
		558	else
		559	{
		560	slog (L_ERR,
		561	_("FATAL: unknown revents %08x in socket, terminating\n"),
		562	revents);
		563	exit (EXIT_FAILURE);
360	}	564	}
361	}	565	}
362		566
363	void	567	void
364	vpn::tap_ev (io_watcher &w, short revents)	568	vpn::tap_ev (io_watcher &w, short revents)
365	{	569	{
366	if (revents & POLLIN)	570	if (revents & EVENT_READ)
367	{	571	{
368	/* process data */	572	/* process data */
369	tap_packet *pkt;	573	tap_packet *pkt;
370		574
371	pkt = tap->recv ();	575	pkt = tap->recv ();
372		576
		577	if (!pkt)
		578	return;
		579
		580	if (pkt->len > 14)
		581	{
373	int dst = mac2id (pkt->dst);	582	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	583	int src = mac2id (pkt->src);
375		584
376	if (src != THISNODE->id)	585	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	{	586	{
394	// unicast	587	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
395	if (dst != THISNODE->id)	588	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	589	}
		590
		591	if (dst == THISNODE->id)
		592	{
		593	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		594	exit (EXIT_FAILURE);
		595	}
		596
		597	if (dst > conns.size ())
		598	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
398	else	599	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);	600	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	}	601	}
411		602
412	delete pkt;	603	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	}	604	}
419	else	605	else
420	abort ();	606	abort ();
421	}	607	}
422		608
…		…
428	if (events & EVENT_SHUTDOWN)	614	if (events & EVENT_SHUTDOWN)
429	{	615	{
430	slog (L_INFO, _("preparing shutdown..."));	616	slog (L_INFO, _("preparing shutdown..."));
431		617
432	shutdown_all ();	618	shutdown_all ();
433
434	remove_pid (pidfilename);	619	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	620	slog (L_INFO, _("terminating"));
437		621	exit (EXIT_SUCCESS);
438	exit (0);
439	}	622	}
440		623
441	if (events & EVENT_RECONNECT)	624	if (events & EVENT_RECONNECT)
442	{	625	{
443	slog (L_INFO, _("forced reconnect"));	626	slog (L_INFO, _("forced reconnect"));
…		…
445	reconnect_all ();	628	reconnect_all ();
446	}	629	}
447		630
448	events = 0;	631	events = 0;
449	}	632	}
450
451	w.at = TSTAMP_CANCEL;
452	}	633	}
453		634
454	void	635	void
455	vpn::shutdown_all ()	636	vpn::shutdown_all ()
456	{	637	{
…		…
469	connection_init ();	650	connection_init ();
470		651
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	652	for (configuration::node_vector::iterator i = conf.nodes.begin ();
472	i != conf.nodes.end (); ++i)	653	i != conf.nodes.end (); ++i)
473	{	654	{
474	connection *conn = new connection (this);	655	connection conn = new connection (this, i);
475
476	conn->conf = *i;
477	conns.push_back (conn);	656	conns.push_back (conn);
478
479	conn->establish_connection ();	657	conn->establish_connection ();
480	}	658	}
481	}	659	}
482		660
483	connection *vpn::find_router ()	661	connection *vpn::find_router ()
484	{	662	{
485	u32 prio = 0;	663	u32 prio = 1;
486	connection *router = 0;	664	connection *router = 0;
487		665
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	666	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	667	{
490	connection c = i;	668	connection c = i;
491		669
492	if (c->conf->routerprio > prio	670	if (c->conf->routerprio > prio
493	&& c->connectmode == conf_node::C_ALWAYS	671	&& 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)	672	&& c->ictx && c->octx
		673	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
496	{	674	{
497	prio = c->conf->routerprio;	675	prio = c->conf->routerprio;
498	router = c;	676	router = c;
499	}	677	}
500	}	678	}
…		…
509	if (c)	687	if (c)
510	c->send_connect_request (id);	688	c->send_connect_request (id);
511	else	689	else
512	// no router found, aggressively connect to all routers	690	// no router found, aggressively connect to all routers
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	691	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
514	if ((*i)->conf->routerprio)	692	if ((i)->conf->routerprio && (i)->conf != THISNODE)
515	(*i)->establish_connection ();	693	(*i)->establish_connection ();
516	}	694	}
517		695
518	void	696	void
519	connection::dump_status ()	697	connection::dump_status ()
…		…
537		715
538	slog (L_NOTICE, _("END status dump"));	716	slog (L_NOTICE, _("END status dump"));
539	}	717	}
540		718
541	vpn::vpn (void)	719	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	720	: event (this, &vpn::event_cb)
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	721	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	722	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	723	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	724	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
548	#endif	725	#endif
		726	#if ENABLE_ICMP
		727	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		728	#endif
		729	#if ENABLE_DNS
		730	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		731	#endif
		732	, tap_ev_watcher (this, &vpn::tap_ev)
549	{	733	{
550	}	734	}
551		735
552	vpn::~vpn ()	736	vpn::~vpn ()
553	{	737	{

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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 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC

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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 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC