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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.35 by pcg, Fri Apr 8 16:12:49 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
43	#if ENABLE_TCP	47	vpn network; // THE vpn (bad design...)
44	# include <map>
45	# include <unistd.h>
46	# include <fcntl.h>
47	# include <sys/poll.h>
48	#endif
49		48
50	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
51		50
52	const char *vpn::script_if_up ()	51	void
		52	vpn::script_init_env ()
53	{	53	{
54	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
55	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		60
61	char *env;	61	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	63	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	64	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		65	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	66	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);	67	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);
75	putenv (env);
76		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,
77	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;
78	}	98	}
79		99
80	int	100	int
81	vpn::setup ()	101	vpn::setup ()
82	{	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
		114	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		115	// this I really consider a linux bug. I am neither connected
		116	// nor do I fragment myself. Linux still sets DF and doesn't
		117	// fragment for me sometimes.
		118	{
		119	int oval = IP_PMTUDISC_DONT;
		120	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		121	}
		122	#endif
		123
		124	sockinfo si (THISNODE, PROT_IPv4);
		125
		126	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		127	{
		128	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		129	exit (EXIT_FAILURE);
		130	}
		131
		132	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		133	}
		134
83	udpv4_fd = -1;	135	udpv4_fd = -1;
84		136
85	if (THISNODE->protocols & PROT_UDPv4)	137	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	138	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	139	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		140
89	if (udpv4_fd < 0)	141	if (udpv4_fd < 0)
90	return -1;	142	return -1;
91		143
92	sockinfo si (THISNODE, PROT_UDPv4);	144	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
93		145
94	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	146	// standard daemon practise...
95	{	147	{
96	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	148	int oval = 1;
97	exit (1);	149	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98	}	150	}
99		151
100	#ifdef IP_MTU_DISCOVER	152	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101	// this I really consider a linux bug. I am neither connected	153	// this I really consider a linux bug. I am neither connected
102	// nor do I fragment myself. Linux still sets DF and doesn't	154	// nor do I fragment myself. Linux still sets DF and doesn't
103	// fragment for me sometimes.	155	// fragment for me sometimes.
104	{	156	{
105	int oval = IP_PMTUDISC_DONT;	157	int oval = IP_PMTUDISC_DONT;
106	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	158	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107	}	159	}
108	#endif	160	#endif
109		161
110	// standard daemon practise...	162	sockinfo si (THISNODE, PROT_UDPv4);
		163
		164	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		165	{
		166	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		167	exit (EXIT_FAILURE);
		168	}
		169
		170	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		171	}
		172
		173	icmpv4_fd = -1;
		174
		175	#if ENABLE_ICMP
		176	if (THISNODE->protocols & PROT_ICMPv4)
		177	{
		178	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		179
		180	if (icmpv4_fd < 0)
		181	return -1;
		182
		183	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		184
		185	#ifdef ICMP_FILTER
111	{	186	{
112	int oval = 1;	187	icmp_filter oval;
		188	oval.data = 0xffffffff;
		189	if (::conf.icmp_type < 32)
		190	oval.data &= ~(1 << ::conf.icmp_type);
		191
113	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	192	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114	}	193	}
		194	#endif
115		195
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	196	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
117	}
118
119	ipv4_fd = -1;
120	if (THISNODE->protocols & PROT_IPv4)
121	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
123
124	if (ipv4_fd < 0)
125	return -1;
126
127	sockinfo si (THISNODE, PROT_IPv4);
128
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
130	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
132	exit (1);
133	}
134
135	#ifdef IP_MTU_DISCOVER
136	// this I really consider a linux bug. I am neither connected	197	// this I really consider a linux bug. I am neither connected
137	// nor do I fragment myself. Linux still sets DF and doesn't	198	// nor do I fragment myself. Linux still sets DF and doesn't
138	// fragment for me sometimes.	199	// fragment for me sometimes.
139	{	200	{
140	int oval = IP_PMTUDISC_DONT;	201	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	202	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	203	}
143	#endif	204	#endif
144		205
		206	sockinfo si (THISNODE, PROT_ICMPv4);
		207
		208	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		209	{
		210	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		211	exit (EXIT_FAILURE);
		212	}
		213
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	214	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	215	}
		216	#endif
		217
		218	tcpv4_fd = -1;
147		219
148	#if ENABLE_TCP	220	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	221	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	222	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	223	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		224
153	if (tcpv4_fd < 0)	225	if (tcpv4_fd < 0)
154	return -1;	226	return -1;
155		227
156	sockinfo si (THISNODE, PROT_TCPv4);	228	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
157
158	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
159	{
160	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
161	exit (1);
162	}
163
164	if (listen (tcpv4_fd, 5))
165	{
166	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);
168	}
169		229
170	// standard daemon practise...	230	// standard daemon practise...
171	{	231	{
172	int oval = 1;	232	int oval = 1;
173	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	233	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174	}	234	}
175		235
		236	sockinfo si (THISNODE, PROT_TCPv4);
		237
		238	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		239	{
		240	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		241	exit (EXIT_FAILURE);
		242	}
		243
		244	if (listen (tcpv4_fd, 5))
		245	{
		246	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
		249
176	tcpv4_accept_watcher.start (tcpv4_fd, POLLIN);	250	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		251	}
		252	#endif
		253
		254	#if ENABLE_DNS
		255	if (THISNODE->protocols & PROT_DNSv4)
		256	{
		257	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		258
		259	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		260
		261	if (dnsv4_fd < 0)
		262	return -1;
		263
		264	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		265	// this I really consider a linux bug. I am neither connected
		266	// nor do I fragment myself. Linux still sets DF and doesn't
		267	// fragment for me sometimes.
		268	{
		269	int oval = IP_PMTUDISC_DONT;
		270	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177	}	271	}
178	#endif	272	# endif
		273
		274	// standard daemon practise...
		275	{
		276	int oval = 1;
		277	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		278	}
		279
		280	sockinfo si (THISNODE->dns_hostname,
		281	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		282	PROT_DNSv4);
		283
		284	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		285	{
		286	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		287	exit (EXIT_FAILURE);
		288	}
		289
		290	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		291	}
		292	#endif
		293
		294	/////////////////////////////////////////////////////////////////////////////
		295
		296	reconnect_all ();
		297
		298	/////////////////////////////////////////////////////////////////////////////
179		299
180	tap = new tap_device ();	300	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	301	if (!tap) //D this, of course, never catches
182	{	302	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	303	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	304	exit (EXIT_FAILURE);
185	}	305	}
186		306
		307	if (tap->if_up () &&
		308	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		309	{
		310	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		311	tap->if_up ());
		312	exit (EXIT_FAILURE);
		313	}
		314
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	315	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		316	{
		317	slog (L_ERR, _("if-up command execution failed, exiting."));
		318	exit (EXIT_FAILURE);
		319	}
188		320
189	tap_ev_watcher.start (tap->fd, POLLIN);	321	tap_ev_watcher.start (tap->fd, EVENT_READ);
190
191	reconnect_all ();
192		322
193	return 0;	323	return 0;
194	}	324	}
195		325
196	void	326	bool
197	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	327	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198	{	328	{
		329	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	330	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		331	#endif
200	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	332	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201	}
202		333
203	void	334	return true;
		335	}
		336
		337	static u16
		338	ipv4_checksum (u16 *data, unsigned int len)
		339	{
		340	// use 32 bit accumulator and fold back carry bits at the end
		341	u32 sum = 0;
		342
		343	while (len > 1)
		344	{
		345	sum += *data++;
		346	len -= 2;
		347	}
		348
		349	// odd byte left?
		350	if (len)
		351	sum += (u8 )data;
		352
		353	// add back carry bits
		354	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		355	sum += (sum >> 16); // carry
		356
		357	return ~sum;
		358	}
		359
		360	#if ENABLE_ICMP
		361	bool
		362	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		363	{
		364	#if defined(SOL_IP) && defined(IP_TOS)
		365	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		366	#endif
		367
		368	pkt->unshift_hdr (4);
		369
		370	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		371	hdr->type = ::conf.icmp_type;
		372	hdr->code = 255;
		373	hdr->checksum = 0;
		374	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		375
		376	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		377
		378	return true;
		379	}
		380	#endif
		381
		382	bool
204	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	383	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205	{	384	{
		385	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	386	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		387	#endif
207	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	388	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		389
		390	return true;
		391	}
		392
		393	void
		394	vpn::inject_data_packet (tap_packet *pkt, int dst)
		395	{
		396	if (dst)
		397	{
		398	// unicast
		399	if (dst != THISNODE->id)
		400	conns[dst - 1]->inject_data_packet (pkt);
		401	}
		402	else
		403	{
		404	// broadcast, this is ugly, but due to the security policy
		405	// we have to connect to all hosts...
		406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		407	if ((*c)->conf != THISNODE)
		408	(*c)->inject_data_packet (pkt, true);
		409	}
208	}	410	}
209		411
210	void	412	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	413	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	414	{
219	if (src == 0 \|\| src > conns.size ()	421	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	422	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	423	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	424	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	425	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		426	else if (dst > conns.size ())
		427	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		428	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224	else	429	else
225	{	430	{
226	connection *c = conns[src - 1];	431	connection *c = conns[src - 1];
227		432
228	if (dst == 0 && !THISNODE->routerprio)	433	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	434	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	435	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	436	else if (dst != THISNODE->id)
232	// FORWARDING NEEDED ;)	437	{
		438	if (THISNODE->routerprio)
		439	// the tos setting gets lost here. who cares.
		440	conns[dst - 1]->inject_vpn_packet (pkt);
		441	else
233	slog (L_WARN,	442	slog (L_WARN,
234	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	443	_("%s(%s): forwarding request (=> %s), but we are no router"),
		444	c->conf->nodename, (const char *)rsi,
235	dst, conns[dst - 1]->conf->nodename,	445	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	446	}
237	THISNODE->id, THISNODE->nodename);
238	else	447	else
239	c->recv_vpn_packet (pkt, rsi);	448	c->recv_vpn_packet (pkt, rsi);
240	}	449	}
241	}	450	}
242		451
		452	bool
		453	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		454	{
		455	switch (si.prot)
		456	{
		457	case PROT_IPv4:
		458	return send_ipv4_packet (pkt, si, tos);
		459	case PROT_UDPv4:
		460	return send_udpv4_packet (pkt, si, tos);
		461	#if ENABLE_TCP
		462	case PROT_TCPv4:
		463	return send_tcpv4_packet (pkt, si, tos);
		464	#endif
		465	#if ENABLE_ICMP
		466	case PROT_ICMPv4:
		467	return send_icmpv4_packet (pkt, si, tos);
		468	#endif
		469	#if ENABLE_DNS
		470	case PROT_DNSv4:
		471	return send_dnsv4_packet (pkt, si, tos);
		472	#endif
		473
		474	default:
		475	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		476	}
		477
		478	return false;
		479	}
		480
243	void	481	void
244	vpn::udpv4_ev (int fd, short revents)	482	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	483	{
246	if (revents & (POLLIN \| POLLERR))	484	if (revents & EVENT_READ)
247	{	485	{
248	vpn_packet *pkt = new vpn_packet;	486	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	487	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	488	socklen_t sa_len = sizeof (sa);
251	int len;	489	int len;
252		490
253	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	491	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		492
255	sockinfo si(sa);	493	sockinfo si(sa, PROT_IPv4);
256		494
257	if (len > 0)	495	if (len > 0)
258	{	496	{
259	pkt->len = len;	497	pkt->len = len;
		498
		499	// raw sockets deliver the ipv4 header, but don't expect it on sends
		500	pkt->skip_hdr (IP_OVERHEAD);
260		501
261	recv_vpn_packet (pkt, si);	502	recv_vpn_packet (pkt, si);
262	}	503	}
263	else	504	else
264	{	505	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	507	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	508	}
268		509
269	delete pkt;	510	delete pkt;
270	}	511	}
271	else if (revents & POLLHUP)
272	{
273	// this cannot ;) happen on udp sockets
274	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
275	exit (1);
276	}
277	else	512	else
278	{	513	{
279	slog (L_ERR,	514	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	515	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	516	revents);
282	exit (1);	517	exit (EXIT_FAILURE);
283	}	518	}
284	}	519	}
285		520
		521	#if ENABLE_ICMP
286	void	522	void
287	vpn::ipv4_ev (int fd, short revents)	523	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	524	{
289	if (revents & (POLLIN \| POLLERR))	525	if (revents & EVENT_READ)
290	{	526	{
291	vpn_packet *pkt = new vpn_packet;	527	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	528	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	529	socklen_t sa_len = sizeof (sa);
294	int len;	530	int len;
295		531
296	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	532	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		533
298	sockinfo si(sa, PROT_IPv4);	534	sockinfo si(sa, PROT_ICMPv4);
299		535
300	if (len > 0)	536	if (len > 0)
301	{	537	{
302	pkt->len = len;	538	pkt->len = len;
303		539
		540	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		541
		542	if (hdr->type == ::conf.icmp_type
		543	&& hdr->code == 255)
		544	{
304	// raw sockets deliver the ipv4, but don't expect it on sends	545	// raw sockets deliver the ipv4, but don't expect it on sends
305	// this is slow, but...	546	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	547	pkt->skip_hdr (ICMP_OVERHEAD);
307		548
308	recv_vpn_packet (pkt, si);	549	recv_vpn_packet (pkt, si);
		550	}
309	}	551	}
310	else	552	else
311	{	553	{
312	// probably ECONNRESET or somesuch	554	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	555	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	556	}
315		557
316	delete pkt;	558	delete pkt;
317	}
318	else if (revents & POLLHUP)
319	{
320	// this cannot ;) happen on udp sockets
321	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
322	exit (1);
323	}	559	}
324	else	560	else
325	{	561	{
326	slog (L_ERR,	562	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	563	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	564	revents);
329	exit (1);	565	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_info {
336	int fd;
337	bool ok;
338	io_watcher r;
339
340	tcp_info (vpn *v)
341	: r(v, &vpn::tcpv4_ev)
342	{	566	}
343	fd = -1;	567	}
		568	#endif
		569
		570	void
		571	vpn::udpv4_ev (io_watcher &w, short revents)
		572	{
		573	if (revents & EVENT_READ)
344	}	574	{
345		575	vpn_packet *pkt = new vpn_packet;
346	~tcp_info () { close (fd); }
347	};
348
349	typedef map<sockinfo, tcp_info *> tcp_si_map;
350	typedef map<int, tcp_info *> tcp_fd_map; // unneecssary if iom would be cooler
351	static tcp_si_map tcp_si;
352	static tcp_fd_map tcp_fd;
353
354	void
355	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
356	{
357	tcp_si_map::iterator info = tcp_si.find (si);
358
359	if (info == tcp_si.end ())
360	{
361	// woaw, the first lost packet ;)
362	tcp_info *i = new tcp_info (this);
363
364	i->ok = false;
365	i->fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
366
367	if (i->fd >= 0)
368	{
369	fcntl (i->fd, F_SETFL, O_NONBLOCK);
370
371	if (connect (i->fd, si.sav4 (), si.salenv4 ()) >= 0
372	\|\| errno == EINPROGRESS)
373	{
374	tcp_si.insert (tcp_si_map::value_type (si, i));
375	tcp_fd.insert (tcp_fd_map::value_type (i->fd, i));
376	return;
377	}
378
379	delete i;
380	}
381	}
382	else
383	{
384	tcp_info *i = info->second;
385
386	if (i->ok)
387	{
388	setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
389
390	if (write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32))
391	{
392	// error, close socket, forget it and retry immediately
393	tcp_si.erase (info);
394	tcp_fd.erase (i->fd);
395	delete i;
396
397	// tail recursion is... better than goto(?)
398	send_tcpv4_packet (pkt, si, tos);
399	}
400	}
401	}
402
403	#if 0
404	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
405	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
406	#endif
407	}
408
409	void
410	vpn::tcpv4_accept (int fd, short revents)
411	{
412	if (revents & (POLLIN \| POLLERR))
413	{
414	struct sockaddr_in sa;	576	struct sockaddr_in sa;
415	socklen_t sa_len = sizeof (sa);	577	socklen_t sa_len = sizeof (sa);
416	int len;	578	int len;
417		579
418	fd = accept (fd, (sockaddr *)&sa, &sa_len);	580	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
419		581
420	if (fd >= 0)
421	{
422	fcntl (fd, F_SETFL, O_NONBLOCK);
423
424	sockinfo si(sa, PROT_TCPv4);	582	sockinfo si(sa, PROT_UDPv4);
425	tcp_info *i = new tcp_info (this);
426		583
427	i->fd = fd;	584	if (len > 0)
428	i->ok = true;
429	i->r.start (fd, POLLIN);
430
431	tcp_si.insert (tcp_si_map::value_type (si, i));
432	tcp_fd.insert (tcp_fd_map::value_type (fd, i));
433	}	585	{
434	}	586	pkt->len = len;
435	}
436		587
437	void	588	recv_vpn_packet (pkt, si);
438	vpn::tcpv4_ev (int fd, short revents)
439	{
440	if (revents & (POLLIN \| POLLERR))
441	{
442	tcp_fd_map::iterator info = tcp_fd.find (fd);
443
444	if (info != tcp_fd.end ())
445	{	589	}
446	tcp_info *i = info->second;	590	else
447
448	if (!i->ok) // not yet established
449	{
450	i->ok = true;
451	fcntl (i->fd, F_SETFL, 0);
452	}
453
454	u32 len;
455
456	if (sizeof (len) == read (fd, &len, sizeof (len)))
457	{
458	slog (L_ERR, "%d bytes received\n", len);
459	}
460
461	//tcp_si.erase (i);
462	tcp_fd.erase (fd);
463	delete i;
464	}	591	{
		592	// probably ECONNRESET or somesuch
		593	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		594	}
		595
		596	delete pkt;
		597	}
		598	else
465	}	599	{
		600	slog (L_ERR,
		601	_("FATAL: unknown revents %08x in socket, terminating\n"),
		602	revents);
		603	exit (EXIT_FAILURE);
		604	}
466	}	605	}
467		606
468	#endif
469
470	void	607	void
471	vpn::tap_ev (int fd, short revents)	608	vpn::tap_ev (io_watcher &w, short revents)
472	{	609	{
473	if (revents & POLLIN)	610	if (revents & EVENT_READ)
474	{	611	{
475	/* process data */	612	/* process data */
476	tap_packet *pkt;	613	tap_packet *pkt;
477		614
478	pkt = tap->recv ();	615	pkt = tap->recv ();
479		616
		617	if (!pkt)
		618	return;
		619
		620	if (pkt->len > 14)
		621	{
480	int dst = mac2id (pkt->dst);	622	int dst = mac2id (pkt->dst);
481	int src = mac2id (pkt->src);	623	int src = mac2id (pkt->src);
482		624
483	if (src != THISNODE->id)	625	if (src != THISNODE->id)
484	{
485	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
486	exit (1);
487	}
488
489	if (dst == THISNODE->id)
490	{
491	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
492	exit (1);
493	}
494
495	if (dst > conns.size ())
496	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
497	else
498	{
499	if (dst)
500	{	626	{
501	// unicast	627	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
502	if (dst != THISNODE->id)	628	exit (EXIT_FAILURE);
503	conns[dst - 1]->inject_data_packet (pkt);
504	}	629	}
		630
		631	if (dst == THISNODE->id)
		632	{
		633	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		634	exit (EXIT_FAILURE);
		635	}
		636
		637	if (dst > conns.size ())
		638	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
505	else	639	else
506	{
507	// broadcast, first check router, then self, then english
508	connection *router = find_router ();
509
510	if (router)
511	router->inject_data_packet (pkt, true);	640	inject_data_packet (pkt, dst);
512	else
513	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
514	if ((*c)->conf != THISNODE)
515	(*c)->inject_data_packet (pkt);
516	}
517	}	641	}
518		642
519	delete pkt;	643	delete pkt;
520	}
521	else if (revents & (POLLHUP \| POLLERR))
522	{
523	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
524	exit (1);
525	}	644	}
526	else	645	else
527	abort ();	646	abort ();
528	}	647	}
529		648
530	void	649	void
531	vpn::event_cb (tstamp &ts)	650	vpn::event_cb (time_watcher &w)
532	{	651	{
533	if (events)	652	if (events)
534	{	653	{
535	if (events & EVENT_SHUTDOWN)	654	if (events & EVENT_SHUTDOWN)
536	{	655	{
537	slog (L_INFO, _("preparing shutdown..."));	656	slog (L_INFO, _("preparing shutdown..."));
538		657
539	shutdown_all ();	658	shutdown_all ();
540
541	remove_pid (pidfilename);	659	remove_pid (conf.pidfilename);
542
543	slog (L_INFO, _("terminating"));	660	slog (L_INFO, _("terminating"));
544		661	exit (EXIT_SUCCESS);
545	exit (0);
546	}	662	}
547		663
548	if (events & EVENT_RECONNECT)	664	if (events & EVENT_RECONNECT)
549	{	665	{
550	slog (L_INFO, _("forced reconnect"));	666	slog (L_INFO, _("forced reconnect"));
…		…
552	reconnect_all ();	668	reconnect_all ();
553	}	669	}
554		670
555	events = 0;	671	events = 0;
556	}	672	}
557
558	ts = TSTAMP_CANCEL;
559	}	673	}
560		674
561	void	675	void
562	vpn::shutdown_all ()	676	vpn::shutdown_all ()
563	{	677	{
…		…
576	connection_init ();	690	connection_init ();
577		691
578	for (configuration::node_vector::iterator i = conf.nodes.begin ();	692	for (configuration::node_vector::iterator i = conf.nodes.begin ();
579	i != conf.nodes.end (); ++i)	693	i != conf.nodes.end (); ++i)
580	{	694	{
581	connection *conn = new connection (this);	695	connection conn = new connection (this, i);
582
583	conn->conf = *i;
584	conns.push_back (conn);	696	conns.push_back (conn);
585
586	conn->establish_connection ();	697	conn->establish_connection ();
587	}	698	}
588	}	699	}
589		700
590	connection *vpn::find_router ()	701	connection *vpn::find_router ()
591	{	702	{
592	u32 prio = 0;	703	u32 prio = 1;
593	connection *router = 0;	704	connection *router = 0;
594		705
595	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	706	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596	{	707	{
597	connection c = i;	708	connection c = i;
598		709
599	if (c->conf->routerprio > prio	710	if (c->conf->routerprio > prio
600	&& c->connectmode == conf_node::C_ALWAYS	711	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
601	&& c->conf != THISNODE
602	&& c->ictx && c->octx)	712	&& c->ictx && c->octx
		713	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603	{	714	{
604	prio = c->conf->routerprio;	715	prio = c->conf->routerprio;
605	router = c;	716	router = c;
606	}	717	}
607	}	718	}
608		719
609	return router;	720	return router;
610	}	721	}
611		722
612	void vpn::connect_request (int id)	723	void vpn::send_connect_request (int id)
613	{	724	{
614	connection *c = find_router ();	725	connection *c = find_router ();
615		726
616	if (c)	727	if (c)
617	c->connect_request (id);	728	c->send_connect_request (id);
618	//else // does not work, because all others must connect to the same router	729	else
619	// // no router found, aggressively connect to all routers	730	// no router found, aggressively connect to all routers
620	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621	// if ((*i)->conf->routerprio)	732	if ((i)->conf->routerprio && (i)->conf != THISNODE)
622	// (*i)->establish_connection ();	733	(*i)->establish_connection ();
623	}	734	}
624		735
625	void	736	void
626	connection::dump_status ()	737	connection::dump_status ()
627	{	738	{
…		…
644		755
645	slog (L_NOTICE, _("END status dump"));	756	slog (L_NOTICE, _("END status dump"));
646	}	757	}
647		758
648	vpn::vpn (void)	759	vpn::vpn (void)
649	: event(this, &vpn::event_cb)	760	: event (this, &vpn::event_cb)
650	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	761	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	762	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652	, tap_ev_watcher (this, &vpn::tap_ev)
653	#if ENABLE_TCP	763	#if ENABLE_TCP
654	, tcpv4_accept_watcher(this, &vpn::tcpv4_accept)	764	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655	#endif	765	#endif
		766	#if ENABLE_ICMP
		767	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		768	#endif
		769	#if ENABLE_DNS
		770	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		771	#endif
		772	, tap_ev_watcher (this, &vpn::tap_ev)
656	{	773	{
657	}	774	}
658		775
659	vpn::~vpn ()	776	vpn::~vpn ()
660	{	777	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.2 by pcg, Wed Apr 2 05:15:00 2003 UTC vs. Revision 1.35 by pcg, Fri Apr 8 16:12:49 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.35 by pcg, Fri Apr 8 16:12:49 2005 UTC