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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.39 by pcg, Sat Nov 10 05:14:22 2007 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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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	{
		103	ipv4_fd = -1;
		104
		105	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		106	{
		107	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		108
		109	if (ipv4_fd < 0)
		110	return -1;
		111
		112	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		113	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		114
		115	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		116	// this I really consider a linux bug. I am neither connected
		117	// nor do I fragment myself. Linux still sets DF and doesn't
		118	// fragment for me sometimes.
		119	{
		120	int oval = IP_PMTUDISC_DONT;
		121	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		122	}
		123	#endif
		124
		125	sockinfo si (THISNODE, PROT_IPv4);
		126
		127	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		128	{
		129	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		130	exit (EXIT_FAILURE);
		131	}
		132
		133	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		134	}
		135
76	udpv4_fd = -1;	136	udpv4_fd = -1;
77		137
78	if (THISNODE->protocols & PROT_UDPv4)	138	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	139	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	140	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		141
82	if (udpv4_fd < 0)	142	if (udpv4_fd < 0)
83	return -1;	143	return -1;
		144
		145	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		146	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
84		147
85	// standard daemon practise...	148	// standard daemon practise...
86	{	149	{
87	int oval = 1;	150	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	151	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	152	}
90		153
91	sockinfo si (THISNODE, PROT_UDPv4);	154	#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	155	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	156	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	157	// fragment for me sometimes.
103	{	158	{
104	int oval = IP_PMTUDISC_DONT;	159	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	160	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	161	}
107	#endif	162	#endif
108		163
		164	sockinfo si (THISNODE, PROT_UDPv4);
		165
		166	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		167	{
		168	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		169	exit (EXIT_FAILURE);
		170	}
		171
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	172	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
110	}	173	}
111		174
112	ipv4_fd = -1;	175	icmpv4_fd = -1;
		176
		177	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	178	if (THISNODE->protocols & PROT_ICMPv4)
114	{	179	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	180	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		181
117	if (ipv4_fd < 0)	182	if (icmpv4_fd < 0)
118	return -1;	183	return -1;
119		184
120	sockinfo si (THISNODE, PROT_IPv4);	185	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		186	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
121		187
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	188	#ifdef ICMP_FILTER
123	{	189	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	190	icmp_filter oval;
125	exit (1);	191	oval.data = 0xffffffff;
		192	if (::conf.icmp_type < 32)
		193	oval.data &= ~(1 << ::conf.icmp_type);
		194
		195	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	196	}
		197	#endif
127		198
128	#ifdef IP_MTU_DISCOVER	199	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	200	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	201	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	202	// fragment for me sometimes.
132	{	203	{
133	int oval = IP_PMTUDISC_DONT;	204	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	205	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	206	}
136	#endif	207	#endif
137		208
		209	sockinfo si (THISNODE, PROT_ICMPv4);
		210
		211	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		212	{
		213	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		214	exit (EXIT_FAILURE);
		215	}
		216
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	217	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
139	}	218	}
		219	#endif
		220
		221	tcpv4_fd = -1;
140		222
141	#if ENABLE_TCP	223	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	224	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	225	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	226	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		227
146	if (tcpv4_fd < 0)	228	if (tcpv4_fd < 0)
147	return -1;	229	return -1;
		230
		231	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		232	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
148		233
149	// standard daemon practise...	234	// standard daemon practise...
150	{	235	{
151	int oval = 1;	236	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	237	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
155	sockinfo si (THISNODE, PROT_TCPv4);	240	sockinfo si (THISNODE, PROT_TCPv4);
156		241
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	242	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	243	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	244	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160	exit (1);	245	exit (EXIT_FAILURE);
161	}	246	}
162		247
163	if (listen (tcpv4_fd, 5))	248	if (listen (tcpv4_fd, 5))
164	{	249	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	250	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166	exit (1);	251	exit (EXIT_FAILURE);
		252	}
		253
		254	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		255	}
		256	#endif
		257
		258	#if ENABLE_DNS
		259	if (THISNODE->protocols & PROT_DNSv4)
		260	{
		261	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		262
		263	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		264
		265	if (dnsv4_fd < 0)
		266	return -1;
		267
		268	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		269	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		270
		271	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		272	// this I really consider a linux bug. I am neither connected
		273	// nor do I fragment myself. Linux still sets DF and doesn't
		274	// fragment for me sometimes.
		275	{
		276	int oval = IP_PMTUDISC_DONT;
		277	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
167	}	278	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#endif	279	# endif
		280
		281	// standard daemon practise...
		282	{
		283	int oval = 1;
		284	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		285	}
		286
		287	sockinfo si (THISNODE->dns_hostname,
		288	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		289	PROT_DNSv4);
		290
		291	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		292	{
		293	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		294	exit (EXIT_FAILURE);
		295	}
		296
		297	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		298	}
		299	#endif
		300
		301	/////////////////////////////////////////////////////////////////////////////
		302
		303	reconnect_all ();
		304
		305	/////////////////////////////////////////////////////////////////////////////
172		306
173	tap = new tap_device ();	307	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	308	if (!tap) //D this, of course, never catches
175	{	309	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	310	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	311	exit (EXIT_FAILURE);
178	}	312	}
179		313
		314	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
		315
		316	if (tap->if_up () &&
		317	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		318	{
		319	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		320	tap->if_up ());
		321	exit (EXIT_FAILURE);
		322	}
		323
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	324	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		325	{
		326	slog (L_ERR, _("if-up command execution failed, exiting."));
		327	exit (EXIT_FAILURE);
		328	}
181		329
182	tap_ev_watcher.start (tap->fd, POLLIN);	330	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		331
186	return 0;	332	return 0;
187	}	333	}
188		334
189	// send a vpn packet out to other hosts	335	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)	336	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	337	{
		338	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	339	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		340	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	341	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220	}
221		342
222	void	343	return true;
		344	}
		345
		346	static u16
		347	ipv4_checksum (u16 *data, unsigned int len)
		348	{
		349	// use 32 bit accumulator and fold back carry bits at the end
		350	u32 sum = 0;
		351
		352	while (len > 1)
		353	{
		354	sum += *data++;
		355	len -= 2;
		356	}
		357
		358	// odd byte left?
		359	if (len)
		360	sum += (u8 )data;
		361
		362	// add back carry bits
		363	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		364	sum += (sum >> 16); // carry
		365
		366	return ~sum;
		367	}
		368
		369	#if ENABLE_ICMP
		370	bool
		371	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		372	{
		373	#if defined(SOL_IP) && defined(IP_TOS)
		374	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		375	#endif
		376
		377	pkt->unshift_hdr (4);
		378
		379	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		380	hdr->type = ::conf.icmp_type;
		381	hdr->code = 255;
		382	hdr->checksum = 0;
		383	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		384
		385	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		386
		387	return true;
		388	}
		389	#endif
		390
		391	bool
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	392	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
224	{	393	{
		394	#if defined(SOL_IP) && defined(IP_TOS)
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	395	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		396	#endif
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	397	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		398
		399	return true;
		400	}
		401
		402	void
		403	vpn::inject_data_packet (tap_packet *pkt, int dst)
		404	{
		405	if (dst)
		406	{
		407	// unicast
		408	if (dst != THISNODE->id)
		409	conns[dst - 1]->inject_data_packet (pkt);
		410	}
		411	else
		412	{
		413	// broadcast, this is ugly, but due to the security policy
		414	// we have to connect to all hosts...
		415	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		416	if ((*c)->conf != THISNODE)
		417	(*c)->inject_data_packet (pkt, true);
		418	}
227	}	419	}
228		420
229	void	421	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	422	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	423	{
…		…
238	if (src == 0 \|\| src > conns.size ()	430	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	431	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	432	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	433	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	434	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		435	else if (dst > conns.size ())
		436	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		437	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	438	else
244	{	439	{
245	connection *c = conns[src - 1];	440	connection *c = conns[src - 1];
246		441
247	if (dst == 0 && !THISNODE->routerprio)	442	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	443	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
249	c->conf->nodename, (const char *)rsi);	444	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	445	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	446	{
		447	if (THISNODE->routerprio)
		448	// the tos setting gets lost here. who cares.
		449	conns[dst - 1]->inject_vpn_packet (pkt);
		450	else
252	slog (L_WARN,	451	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	452	_("%s(%s): forwarding request (=> %s), but we are no router"),
		453	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	454	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	455	}
256	THISNODE->id, THISNODE->nodename);
257	else	456	else
258	c->recv_vpn_packet (pkt, rsi);	457	c->recv_vpn_packet (pkt, rsi);
259	}	458	}
260	}	459	}
261		460
262	void	461	bool
263	vpn::udpv4_ev (io_watcher &w, short revents)	462	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
264	{	463	{
265	if (revents & (POLLIN \| POLLERR))	464	switch (si.prot)
		465	{
		466	case PROT_IPv4:
		467	return send_ipv4_packet (pkt, si, tos);
		468	case PROT_UDPv4:
		469	return send_udpv4_packet (pkt, si, tos);
		470	#if ENABLE_TCP
		471	case PROT_TCPv4:
		472	return send_tcpv4_packet (pkt, si, tos);
		473	#endif
		474	#if ENABLE_ICMP
		475	case PROT_ICMPv4:
		476	return send_icmpv4_packet (pkt, si, tos);
		477	#endif
		478	#if ENABLE_DNS
		479	case PROT_DNSv4:
		480	return send_dnsv4_packet (pkt, si, tos);
		481	#endif
		482
		483	default:
		484	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		485	}
		486
		487	return false;
		488	}
		489
		490	void
		491	vpn::ipv4_ev (ev::io &w, int revents)
		492	{
		493	if (revents & EV_READ)
266	{	494	{
267	vpn_packet *pkt = new vpn_packet;	495	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	496	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	497	socklen_t sa_len = sizeof (sa);
270	int len;	498	int len;
271		499
272	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	500	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
273		501
274	sockinfo si(sa, PROT_UDPv4);	502	sockinfo si(sa, PROT_IPv4);
275		503
276	if (len > 0)	504	if (len > 0)
277	{	505	{
278	pkt->len = len;	506	pkt->len = len;
279		507
		508	// raw sockets deliver the ipv4 header, but don't expect it on sends
		509	pkt->skip_hdr (IP_OVERHEAD);
		510
280	recv_vpn_packet (pkt, si);	511	recv_vpn_packet (pkt, si);
281	}	512	}
282	else	513	else
283	{	514	{
284	// probably ECONNRESET or somesuch	515	// probably ECONNRESET or somesuch
285	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	516	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
286	}	517	}
287		518
288	delete pkt;	519	delete pkt;
289	}	520	}
290	else if (revents & POLLHUP)
291	{
292	// this cannot ;) happen on udp sockets
293	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
294	exit (1);
295	}
296	else	521	else
297	{	522	{
298	slog (L_ERR,	523	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	524	_("FATAL: unknown revents %08x in socket, terminating\n"),
300	revents);	525	revents);
301	exit (1);	526	exit (EXIT_FAILURE);
302	}	527	}
303	}	528	}
304		529
		530	#if ENABLE_ICMP
305	void	531	void
306	vpn::ipv4_ev (io_watcher &w, short revents)	532	vpn::icmpv4_ev (ev::io &w, int revents)
307	{	533	{
308	if (revents & (POLLIN \| POLLERR))	534	if (revents & EV_READ)
309	{	535	{
310	vpn_packet *pkt = new vpn_packet;	536	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	537	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	538	socklen_t sa_len = sizeof (sa);
313	int len;	539	int len;
314		540
315	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	541	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
316		542
317	sockinfo si(sa, PROT_IPv4);	543	sockinfo si(sa, PROT_ICMPv4);
318		544
319	if (len > 0)	545	if (len > 0)
320	{	546	{
321	pkt->len = len;	547	pkt->len = len;
322		548
		549	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		550
		551	if (hdr->type == ::conf.icmp_type
		552	&& hdr->code == 255)
		553	{
323	// raw sockets deliver the ipv4, but don't expect it on sends	554	// raw sockets deliver the ipv4, but don't expect it on sends
324	// this is slow, but...	555	// this is slow, but...
325	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (ICMP_OVERHEAD);
326		557
327	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
		559	}
328	}	560	}
329	else	561	else
330	{	562	{
331	// probably ECONNRESET or somesuch	563	// probably ECONNRESET or somesuch
332	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	564	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
333	}	565	}
334		566
335	delete pkt;	567	delete pkt;
336	}
337	else if (revents & POLLHUP)
338	{
339	// this cannot ;) happen on udp sockets
340	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
341	exit (1);
342	}	568	}
343	else	569	else
344	{	570	{
345	slog (L_ERR,	571	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	572	_("FATAL: unknown revents %08x in socket, terminating\n"),
347	revents);	573	revents);
348	exit (1);	574	exit (EXIT_FAILURE);
		575	}
		576	}
		577	#endif
		578
		579	void
		580	vpn::udpv4_ev (ev::io &w, int revents)
		581	{
		582	if (revents & EV_READ)
349	}	583	{
350	}	584	vpn_packet *pkt = new vpn_packet;
		585	struct sockaddr_in sa;
		586	socklen_t sa_len = sizeof (sa);
		587	int len;
351		588
		589	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		590
		591	sockinfo si(sa, PROT_UDPv4);
		592
		593	if (len > 0)
		594	{
		595	pkt->len = len;
		596
		597	recv_vpn_packet (pkt, si);
		598	}
		599	else
		600	{
		601	// probably ECONNRESET or somesuch
		602	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		603	}
		604
		605	delete pkt;
		606	}
		607	else
		608	{
		609	slog (L_ERR,
		610	_("FATAL: unknown revents %08x in socket, terminating\n"),
		611	revents);
		612	exit (EXIT_FAILURE);
		613	}
		614	}
		615
352	void	616	void
353	vpn::tap_ev (io_watcher &w, short revents)	617	vpn::tap_ev (ev::io &w, int revents)
354	{	618	{
355	if (revents & POLLIN)	619	if (revents & EV_READ)
356	{	620	{
357	/* process data */	621	/* process data */
358	tap_packet *pkt;	622	tap_packet *pkt;
359		623
360	pkt = tap->recv ();	624	pkt = tap->recv ();
361		625
		626	if (!pkt)
		627	return;
		628
		629	if (pkt->len > 14)
		630	{
362	int dst = mac2id (pkt->dst);	631	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	632	int src = mac2id (pkt->src);
364		633
365	if (src != THISNODE->id)	634	if (src != THISNODE->id)
366	{
367	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
368	exit (1);
369	}
370
371	if (dst == THISNODE->id)
372	{
373	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
374	exit (1);
375	}
376
377	if (dst > conns.size ())
378	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
379	else
380	{
381	if (dst)
382	{	635	{
383	// unicast	636	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	637	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	638	}
		639
		640	if (dst == THISNODE->id)
		641	{
		642	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		643	exit (EXIT_FAILURE);
		644	}
		645
		646	if (dst > conns.size ())
		647	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else	648	else
388	{
389	// broadcast, first check router, then self, then english
390	connection *router = find_router ();
391
392	if (router)
393	router->inject_data_packet (pkt, true);	649	inject_data_packet (pkt, dst);
394	else
395	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
396	if ((*c)->conf != THISNODE)
397	(*c)->inject_data_packet (pkt);
398	}
399	}	650	}
400		651
401	delete pkt;	652	delete pkt;
402	}
403	else if (revents & (POLLHUP \| POLLERR))
404	{
405	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
406	exit (1);
407	}	653	}
408	else	654	else
409	abort ();	655	abort ();
410	}	656	}
411		657
412	void	658	void
413	vpn::event_cb (time_watcher &w)	659	vpn::event_cb (ev::timer &w, int)
414	{	660	{
415	if (events)	661	if (events)
416	{	662	{
417	if (events & EVENT_SHUTDOWN)	663	if (events & EVENT_SHUTDOWN)
418	{	664	{
419	slog (L_INFO, _("preparing shutdown..."));	665	slog (L_INFO, _("preparing shutdown..."));
420		666
421	shutdown_all ();	667	shutdown_all ();
422
423	remove_pid (pidfilename);	668	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	669	slog (L_INFO, _("terminating"));
426		670	exit (EXIT_SUCCESS);
427	exit (0);
428	}	671	}
429		672
430	if (events & EVENT_RECONNECT)	673	if (events & EVENT_RECONNECT)
431	{	674	{
432	slog (L_INFO, _("forced reconnect"));	675	slog (L_INFO, _("forced reconnect"));
…		…
434	reconnect_all ();	677	reconnect_all ();
435	}	678	}
436		679
437	events = 0;	680	events = 0;
438	}	681	}
439
440	w.at = TSTAMP_CANCEL;
441	}	682	}
442		683
443	void	684	void
444	vpn::shutdown_all ()	685	vpn::shutdown_all ()
445	{	686	{
…		…
458	connection_init ();	699	connection_init ();
459		700
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	701	for (configuration::node_vector::iterator i = conf.nodes.begin ();
461	i != conf.nodes.end (); ++i)	702	i != conf.nodes.end (); ++i)
462	{	703	{
463	connection *conn = new connection (this);	704	connection conn = new connection (this, i);
464
465	conn->conf = *i;
466	conns.push_back (conn);	705	conns.push_back (conn);
467
468	conn->establish_connection ();	706	conn->establish_connection ();
469	}	707	}
470	}	708	}
471		709
472	connection *vpn::find_router ()	710	connection *vpn::find_router ()
473	{	711	{
474	u32 prio = 0;	712	u32 prio = 1;
475	connection *router = 0;	713	connection *router = 0;
476		714
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	715	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	716	{
479	connection c = i;	717	connection c = i;
480		718
481	if (c->conf->routerprio > prio	719	if (c->conf->routerprio > prio
482	&& c->connectmode == conf_node::C_ALWAYS	720	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
483	&& c->conf != THISNODE
484	&& c->ictx && c->octx)	721	&& c->ictx && c->octx
		722	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
485	{	723	{
486	prio = c->conf->routerprio;	724	prio = c->conf->routerprio;
487	router = c;	725	router = c;
488	}	726	}
489	}	727	}
490		728
491	return router;	729	return router;
492	}	730	}
493		731
494	void vpn::connect_request (int id)	732	void vpn::send_connect_request (int id)
495	{	733	{
496	connection *c = find_router ();	734	connection *c = find_router ();
497		735
498	if (c)	736	if (c)
499	c->connect_request (id);	737	c->send_connect_request (id);
500	//else // does not work, because all others must connect to the same router	738	else
501	// // no router found, aggressively connect to all routers	739	// no router found, aggressively connect to all routers
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	740	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
503	// if ((*i)->conf->routerprio)	741	if ((i)->conf->routerprio && (i)->conf != THISNODE)
504	// (*i)->establish_connection ();	742	(*i)->establish_connection ();
505	}	743	}
506		744
507	void	745	void
508	connection::dump_status ()	746	connection::dump_status ()
509	{	747	{
…		…
517	}	755	}
518		756
519	void	757	void
520	vpn::dump_status ()	758	vpn::dump_status ()
521	{	759	{
522	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	760	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev::ev_now ());
523		761
524	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	762	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
525	(*c)->dump_status ();	763	(*c)->dump_status ();
526		764
527	slog (L_NOTICE, _("END status dump"));	765	slog (L_NOTICE, _("END status dump"));
528	}	766	}
529		767
530	vpn::vpn (void)	768	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	769	: event (this, &vpn::event_cb)
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	770	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	771	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	772	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	773	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
537	#endif	774	#endif
		775	#if ENABLE_ICMP
		776	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		777	#endif
		778	#if ENABLE_DNS
		779	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		780	#endif
		781	, tap_ev_watcher (this, &vpn::tap_ev)
538	{	782	{
539	}	783	}
540		784
541	vpn::~vpn ()	785	vpn::~vpn ()
542	{	786	{

Diff Legend

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

Comparing gvpe/src/vpn.C (file contents): Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs. Revision 1.39 by pcg, Sat Nov 10 05:14:22 2007 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.39 by pcg, Sat Nov 10 05:14:22 2007 UTC