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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 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 <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 (int)	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);	63	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	64	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	65	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	66	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		67	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	68	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	71	THISNODE->id & 0xff); putenv (env);
68	putenv (env);
69		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,
70	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;
71	}	94	}
72		95
73	int	96	int
74	vpn::setup ()	97	vpn::setup ()
75	{	98	{
76	sockinfo si;	99	ipv4_fd = -1;
77		100
78	si.set (THISNODE);	101	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		102	{
		103	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		104
		105	if (ipv4_fd < 0)
		106	return -1;
		107
		108	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		109
		110	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		111	// this I really consider a linux bug. I am neither connected
		112	// nor do I fragment myself. Linux still sets DF and doesn't
		113	// fragment for me sometimes.
		114	{
		115	int oval = IP_PMTUDISC_DONT;
		116	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		117	}
		118	#endif
		119
		120	sockinfo si (THISNODE, PROT_IPv4);
		121
		122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		123	{
		124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		125	exit (EXIT_FAILURE);
		126	}
		127
		128	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		129	}
79		130
80	udpv4_fd = -1;	131	udpv4_fd = -1;
81		132
82	if (THISNODE->protocols & PROT_UDPv4)	133	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	134	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	135	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		136
86	if (udpv4_fd < 0)	137	if (udpv4_fd < 0)
87	return -1;	138	return -1;
88		139
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	140	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		141
		142	// standard daemon practise...
90	{	143	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	144	int oval = 1;
92	exit (1);	145	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	146	}
94		147
95	#ifdef IP_MTU_DISCOVER	148	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	149	// this I really consider a linux bug. I am neither connected
97	// 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
98	// fragment for me sometimes.	151	// fragment for me sometimes.
99	{	152	{
100	int oval = IP_PMTUDISC_DONT;	153	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	154	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	155	}
103	#endif	156	#endif
104		157
105	// standard daemon practise...	158	sockinfo si (THISNODE, PROT_UDPv4);
		159
		160	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		161	{
		162	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		163	exit (EXIT_FAILURE);
		164	}
		165
		166	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		167	}
		168
		169	icmpv4_fd = -1;
		170
		171	#if ENABLE_ICMP
		172	if (THISNODE->protocols & PROT_ICMPv4)
		173	{
		174	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		175
		176	if (icmpv4_fd < 0)
		177	return -1;
		178
		179	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		180
		181	#ifdef ICMP_FILTER
106	{	182	{
107	int oval = 1;	183	icmp_filter oval;
		184	oval.data = 0xffffffff;
		185	if (::conf.icmp_type < 32)
		186	oval.data &= ~(1 << ::conf.icmp_type);
		187
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	188	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	189	}
		190	#endif
110		191
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	192	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
112	}
113
114	ipv4_fd = -1;
115	if (THISNODE->protocols & PROT_IPv4)
116	{
117	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
118
119	if (ipv4_fd < 0)
120	return -1;
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{
124	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
125	exit (1);
126	}
127
128	#ifdef IP_MTU_DISCOVER
129	// this I really consider a linux bug. I am neither connected	193	// this I really consider a linux bug. I am neither connected
130	// 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
131	// fragment for me sometimes.	195	// fragment for me sometimes.
132	{	196	{
133	int oval = IP_PMTUDISC_DONT;	197	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	199	}
136	#endif	200	#endif
137		201
		202	sockinfo si (THISNODE, PROT_ICMPv4);
		203
		204	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		205	{
		206	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		207	exit (EXIT_FAILURE);
		208	}
		209
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	210	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		211	}
		212	#endif
		213
		214	tcpv4_fd = -1;
		215
		216	#if ENABLE_TCP
		217	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		218	{
		219	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		220
		221	if (tcpv4_fd < 0)
		222	return -1;
		223
		224	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		225
		226	// standard daemon practise...
		227	{
		228	int oval = 1;
		229	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	230	}
		231
		232	sockinfo si (THISNODE, PROT_TCPv4);
		233
		234	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		235	{
		236	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		237	exit (EXIT_FAILURE);
		238	}
		239
		240	if (listen (tcpv4_fd, 5))
		241	{
		242	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		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 ()))
		281	{
		282	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		283	exit (EXIT_FAILURE);
		284	}
		285
		286	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		287	}
		288	#endif
140		289
141	tap = new tap_device ();	290	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	291	if (!tap) //D this, of course, never catches
143	{	292	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	293	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	294	exit (EXIT_FAILURE);
146	}	295	}
147		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
148	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	}
149		310
150	tap_ev_watcher.start (tap->fd, POLLIN);	311	tap_ev_watcher.start (tap->fd, EVENT_READ);
151		312
152	reconnect_all ();	313	reconnect_all ();
153		314
154	return 0;	315	return 0;
155	}	316	}
156		317
157	void	318	bool
158	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)
159	{	320	{
		321	#if defined(SOL_IP) && defined(IP_TOS)
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	322	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		323	#endif
161	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 ());
162	}
163		325
164	void	326	return true;
		327	}
		328
		329	static u16
		330	ipv4_checksum (u16 *data, unsigned int len)
		331	{
		332	// use 32 bit accumulator and fold back carry bits at the end
		333	u32 sum = 0;
		334
		335	while (len > 1)
		336	{
		337	sum += *data++;
		338	len -= 2;
		339	}
		340
		341	// odd byte left?
		342	if (len)
		343	sum += (u8 )data;
		344
		345	// add back carry bits
		346	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		347	sum += (sum >> 16); // carry
		348
		349	return ~sum;
		350	}
		351
		352	#if ENABLE_ICMP
		353	bool
		354	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		355	{
		356	#if defined(SOL_IP) && defined(IP_TOS)
		357	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		358	#endif
		359
		360	pkt->unshift_hdr (4);
		361
		362	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		363	hdr->type = ::conf.icmp_type;
		364	hdr->code = 255;
		365	hdr->checksum = 0;
		366	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		367
		368	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		369
		370	return true;
		371	}
		372	#endif
		373
		374	bool
165	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)
166	{	376	{
		377	#if defined(SOL_IP) && defined(IP_TOS)
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	378	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		379	#endif
168	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 ());
		381
		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	}
169	}	402	}
170		403
171	void	404	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	405	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	406	{
180	if (src == 0 \|\| src > conns.size ()	413	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	414	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	415	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	416	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	417	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		418	else if (dst > conns.size ())
		419	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		420	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	421	else
186	{	422	{
187	connection *c = conns[src - 1];	423	connection *c = conns[src - 1];
188		424
189	if (dst == 0 && !THISNODE->routerprio)	425	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	426	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	427	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	428	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	429	{
		430	if (THISNODE->routerprio)
		431	// the tos setting gets lost here. who cares.
		432	conns[dst - 1]->inject_vpn_packet (pkt);
		433	else
194	slog (L_WARN,	434	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	435	_("%s(%s): forwarding request (=> %s), but we are no router"),
		436	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	437	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	438	}
198	THISNODE->id, THISNODE->nodename);
199	else	439	else
200	c->recv_vpn_packet (pkt, rsi);	440	c->recv_vpn_packet (pkt, rsi);
201	}	441	}
202	}	442	}
203		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
204	void	473	void
205	vpn::udpv4_ev (short revents)	474	vpn::ipv4_ev (io_watcher &w, short revents)
206	{	475	{
207	if (revents & (POLLIN \| POLLERR))	476	if (revents & EVENT_READ)
208	{	477	{
209	vpn_packet *pkt = new vpn_packet;	478	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	479	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	480	socklen_t sa_len = sizeof (sa);
212	int len;	481	int len;
213		482
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	483	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		484
216	sockinfo si(sa);	485	sockinfo si(sa, PROT_IPv4);
217		486
218	if (len > 0)	487	if (len > 0)
219	{	488	{
220	pkt->len = len;	489	pkt->len = len;
		490
		491	// raw sockets deliver the ipv4 header, but don't expect it on sends
		492	pkt->skip_hdr (IP_OVERHEAD);
221		493
222	recv_vpn_packet (pkt, si);	494	recv_vpn_packet (pkt, si);
223	}	495	}
224	else	496	else
225	{	497	{
…		…
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	499	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	500	}
229		501
230	delete pkt;	502	delete pkt;
231	}	503	}
232	else if (revents & POLLHUP)
233	{
234	// this cannot ;) happen on udp sockets
235	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
236	exit (1);
237	}
238	else	504	else
239	{	505	{
240	slog (L_ERR,	506	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	507	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	508	revents);
243	exit (1);	509	exit (EXIT_FAILURE);
244	}	510	}
245	}	511	}
246		512
		513	#if ENABLE_ICMP
247	void	514	void
248	vpn::ipv4_ev (short revents)	515	vpn::icmpv4_ev (io_watcher &w, short revents)
249	{	516	{
250	if (revents & (POLLIN \| POLLERR))	517	if (revents & EVENT_READ)
251	{	518	{
252	vpn_packet *pkt = new vpn_packet;	519	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	520	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	521	socklen_t sa_len = sizeof (sa);
255	int len;	522	int len;
256		523
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	524	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		525
259	sockinfo si(sa, PROT_IPv4);	526	sockinfo si(sa, PROT_ICMPv4);
260		527
261	if (len > 0)	528	if (len > 0)
262	{	529	{
263	pkt->len = len;	530	pkt->len = len;
264		531
		532	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		533
		534	if (hdr->type == ::conf.icmp_type
		535	&& hdr->code == 255)
		536	{
265	// 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
266	// this is slow, but...	538	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	539	pkt->skip_hdr (ICMP_OVERHEAD);
268		540
269	recv_vpn_packet (pkt, si);	541	recv_vpn_packet (pkt, si);
		542	}
270	}	543	}
271	else	544	else
272	{	545	{
273	// probably ECONNRESET or somesuch	546	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	547	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	548	}
276		549
277	delete pkt;	550	delete pkt;
278	}
279	else if (revents & POLLHUP)
280	{
281	// this cannot ;) happen on udp sockets
282	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
283	exit (1);
284	}	551	}
285	else	552	else
286	{	553	{
287	slog (L_ERR,	554	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	555	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	556	revents);
290	exit (1);	557	exit (EXIT_FAILURE);
		558	}
		559	}
		560	#endif
		561
		562	void
		563	vpn::udpv4_ev (io_watcher &w, short revents)
		564	{
		565	if (revents & EVENT_READ)
291	}	566	{
292	}	567	vpn_packet *pkt = new vpn_packet;
		568	struct sockaddr_in sa;
		569	socklen_t sa_len = sizeof (sa);
		570	int len;
293		571
		572	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		573
		574	sockinfo si(sa, PROT_UDPv4);
		575
		576	if (len > 0)
		577	{
		578	pkt->len = len;
		579
		580	recv_vpn_packet (pkt, si);
		581	}
		582	else
		583	{
		584	// probably ECONNRESET or somesuch
		585	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		586	}
		587
		588	delete pkt;
		589	}
		590	else
		591	{
		592	slog (L_ERR,
		593	_("FATAL: unknown revents %08x in socket, terminating\n"),
		594	revents);
		595	exit (EXIT_FAILURE);
		596	}
		597	}
		598
294	void	599	void
295	vpn::tap_ev (short revents)	600	vpn::tap_ev (io_watcher &w, short revents)
296	{	601	{
297	if (revents & POLLIN)	602	if (revents & EVENT_READ)
298	{	603	{
299	/* process data */	604	/* process data */
300	tap_packet *pkt;	605	tap_packet *pkt;
301		606
302	pkt = tap->recv ();	607	pkt = tap->recv ();
303		608
		609	if (!pkt)
		610	return;
		611
		612	if (pkt->len > 14)
		613	{
304	int dst = mac2id (pkt->dst);	614	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	615	int src = mac2id (pkt->src);
306		616
307	if (src != THISNODE->id)	617	if (src != THISNODE->id)
308	{
309	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
310	exit (1);
311	}
312
313	if (dst == THISNODE->id)
314	{
315	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
316	exit (1);
317	}
318
319	if (dst > conns.size ())
320	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
321	else
322	{
323	if (dst)
324	{	618	{
325	// unicast	619	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	620	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	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);
329	else	631	else
330	{
331	// broadcast, first check router, then self, then english
332	connection *router = find_router ();
333
334	if (router)
335	router->inject_data_packet (pkt, true);	632	inject_data_packet (pkt, dst);
336	else
337	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
338	if ((*c)->conf != THISNODE)
339	(*c)->inject_data_packet (pkt);
340	}
341	}	633	}
342		634
343	delete pkt;	635	delete pkt;
344	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}	636	}
350	else	637	else
351	abort ();	638	abort ();
352	}	639	}
353		640
354	void	641	void
355	vpn::event_cb (tstamp &ts)	642	vpn::event_cb (time_watcher &w)
356	{	643	{
357	if (events)	644	if (events)
358	{	645	{
359	if (events & EVENT_SHUTDOWN)	646	if (events & EVENT_SHUTDOWN)
360	{	647	{
361	slog (L_INFO, _("preparing shutdown..."));	648	slog (L_INFO, _("preparing shutdown..."));
362		649
363	shutdown_all ();	650	shutdown_all ();
364
365	remove_pid (pidfilename);	651	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	652	slog (L_INFO, _("terminating"));
368		653	exit (EXIT_SUCCESS);
369	exit (0);
370	}	654	}
371		655
372	if (events & EVENT_RECONNECT)	656	if (events & EVENT_RECONNECT)
373	{	657	{
374	slog (L_INFO, _("forced reconnect"));	658	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	660	reconnect_all ();
377	}	661	}
378		662
379	events = 0;	663	events = 0;
380	}	664	}
381
382	ts = TSTAMP_CANCEL;
383	}	665	}
384		666
385	void	667	void
386	vpn::shutdown_all ()	668	vpn::shutdown_all ()
387	{	669	{
…		…
400	connection_init ();	682	connection_init ();
401		683
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	684	for (configuration::node_vector::iterator i = conf.nodes.begin ();
403	i != conf.nodes.end (); ++i)	685	i != conf.nodes.end (); ++i)
404	{	686	{
405	connection *conn = new connection (this);	687	connection conn = new connection (this, i);
406
407	conn->conf = *i;
408	conns.push_back (conn);	688	conns.push_back (conn);
409
410	conn->establish_connection ();	689	conn->establish_connection ();
411	}	690	}
412	}	691	}
413		692
414	connection *vpn::find_router ()	693	connection *vpn::find_router ()
415	{	694	{
416	u32 prio = 0;	695	u32 prio = 1;
417	connection *router = 0;	696	connection *router = 0;
418		697
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	698	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	699	{
421	connection c = i;	700	connection c = i;
422		701
423	if (c->conf->routerprio > prio	702	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	703	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
425	&& c->conf != THISNODE
426	&& c->ictx && c->octx)	704	&& c->ictx && c->octx
		705	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	706	{
428	prio = c->conf->routerprio;	707	prio = c->conf->routerprio;
429	router = c;	708	router = c;
430	}	709	}
431	}	710	}
432		711
433	return router;	712	return router;
434	}	713	}
435		714
436	void vpn::connect_request (int id)	715	void vpn::send_connect_request (int id)
437	{	716	{
438	connection *c = find_router ();	717	connection *c = find_router ();
439		718
440	if (c)	719	if (c)
441	c->connect_request (id);	720	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	721	else
443	// // no router found, aggressively connect to all routers	722	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	723	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	724	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	725	(*i)->establish_connection ();
447	}	726	}
448		727
449	void	728	void
450	connection::dump_status ()	729	connection::dump_status ()
451	{	730	{
…		…
468		747
469	slog (L_NOTICE, _("END status dump"));	748	slog (L_NOTICE, _("END status dump"));
470	}	749	}
471		750
472	vpn::vpn (void)	751	vpn::vpn (void)
		752	: event (this, &vpn::event_cb)
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	753	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	754	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
		755	#if ENABLE_TCP
		756	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
		757	#endif
		758	#if ENABLE_ICMP
		759	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		760	#endif
		761	#if ENABLE_DNS
		762	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		763	#endif
475	, tap_ev_watcher(this, &vpn::tap_ev)	764	, tap_ev_watcher (this, &vpn::tap_ev)
476	, event(this, &vpn::event_cb)
477	{	765	{
478	}	766	}
479		767
480	vpn::~vpn ()	768	vpn::~vpn ()
481	{	769	{

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:25:17 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 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC