[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 1.38 by pcg, Tue Apr 26 00:55:56 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. 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
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	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, EVENT_READ);
		134	}
		135
83	udpv4_fd = -1;	136	udpv4_fd = -1;
84		137
85	if (THISNODE->protocols & PROT_UDPv4)	138	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	139	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	140	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		141
89	if (udpv4_fd < 0)	142	if (udpv4_fd < 0)
90	return -1;	143	return -1;
91		144
92	sockinfo si (THISNODE, PROT_UDPv4);	145	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		146	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
93		147
94	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	148	// standard daemon practise...
95	{	149	{
96	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	150	int oval = 1;
97	exit (1);	151	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98	}	152	}
99		153
100	#ifdef IP_MTU_DISCOVER	154	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101	// this I really consider a linux bug. I am neither connected	155	// this I really consider a linux bug. I am neither connected
102	// 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
103	// fragment for me sometimes.	157	// fragment for me sometimes.
104	{	158	{
105	int oval = IP_PMTUDISC_DONT;	159	int oval = IP_PMTUDISC_DONT;
106	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	160	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107	}	161	}
108	#endif	162	#endif
109		163
110	// standard daemon practise...	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
		172	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		173	}
		174
		175	icmpv4_fd = -1;
		176
		177	#if ENABLE_ICMP
		178	if (THISNODE->protocols & PROT_ICMPv4)
		179	{
		180	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		181
		182	if (icmpv4_fd < 0)
		183	return -1;
		184
		185	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		186	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		187
		188	#ifdef ICMP_FILTER
111	{	189	{
112	int oval = 1;	190	icmp_filter oval;
		191	oval.data = 0xffffffff;
		192	if (::conf.icmp_type < 32)
		193	oval.data &= ~(1 << ::conf.icmp_type);
		194
113	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	195	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114	}	196	}
		197	#endif
115		198
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	199	#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	200	// this I really consider a linux bug. I am neither connected
137	// 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
138	// fragment for me sometimes.	202	// fragment for me sometimes.
139	{	203	{
140	int oval = IP_PMTUDISC_DONT;	204	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	205	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	206	}
143	#endif	207	#endif
144		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
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	217	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	218	}
		219	#endif
		220
		221	tcpv4_fd = -1;
147		222
148	#if ENABLE_TCP	223	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	224	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	225	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	226	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		227
153	if (tcpv4_fd < 0)	228	if (tcpv4_fd < 0)
154	return -1;	229	return -1;
155		230
156	sockinfo si (THISNODE, PROT_TCPv4);	231	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
157		232	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
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		233
170	// standard daemon practise...	234	// standard daemon practise...
171	{	235	{
172	int oval = 1;	236	int oval = 1;
173	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	237	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174	}	238	}
175		239
		240	sockinfo si (THISNODE, PROT_TCPv4);
		241
		242	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		243	{
		244	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		245	exit (EXIT_FAILURE);
		246	}
		247
		248	if (listen (tcpv4_fd, 5))
		249	{
		250	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		251	exit (EXIT_FAILURE);
		252	}
		253
176	tcpv4_accept_watcher.start (tcpv4_fd, POLLIN);	254	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_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);
177	}	278	}
178	#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, EVENT_READ);
		298	}
		299	#endif
		300
		301	/////////////////////////////////////////////////////////////////////////////
		302
		303	reconnect_all ();
		304
		305	/////////////////////////////////////////////////////////////////////////////
179		306
180	tap = new tap_device ();	307	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	308	if (!tap) //D this, of course, never catches
182	{	309	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	310	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	311	exit (EXIT_FAILURE);
185	}	312	}
186		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
187	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	}
188		329
189	tap_ev_watcher.start (tap->fd, POLLIN);	330	tap_ev_watcher.start (tap->fd, EVENT_READ);
190
191	reconnect_all ();
192		331
193	return 0;	332	return 0;
194	}	333	}
195		334
196	void	335	bool
197	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)
198	{	337	{
		338	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	339	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		340	#endif
200	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 ());
201	}
202		342
203	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
204	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)
205	{	393	{
		394	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	395	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		396	#endif
207	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	}
208	}	419	}
209		420
210	void	421	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	422	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	423	{
219	if (src == 0 \|\| src > conns.size ()	430	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	431	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	432	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	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)"),
223	(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 ());
224	else	438	else
225	{	439	{
226	connection *c = conns[src - 1];	440	connection *c = conns[src - 1];
227		441
228	if (dst == 0 && !THISNODE->routerprio)	442	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	443	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	444	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	445	else if (dst != THISNODE->id)
232	// 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
233	slog (L_WARN,	451	slog (L_WARN,
234	_("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,
235	dst, conns[dst - 1]->conf->nodename,	454	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	455	}
237	THISNODE->id, THISNODE->nodename);
238	else	456	else
239	c->recv_vpn_packet (pkt, rsi);	457	c->recv_vpn_packet (pkt, rsi);
240	}	458	}
241	}	459	}
242		460
		461	bool
		462	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		463	{
		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
243	void	490	void
244	vpn::udpv4_ev (int fd, short revents)	491	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	492	{
246	if (revents & (POLLIN \| POLLERR))	493	if (revents & EVENT_READ)
247	{	494	{
248	vpn_packet *pkt = new vpn_packet;	495	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	496	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	497	socklen_t sa_len = sizeof (sa);
251	int len;	498	int len;
252		499
253	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	500	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		501
255	sockinfo si(sa);	502	sockinfo si(sa, PROT_IPv4);
256		503
257	if (len > 0)	504	if (len > 0)
258	{	505	{
259	pkt->len = len;	506	pkt->len = len;
		507
		508	// raw sockets deliver the ipv4 header, but don't expect it on sends
		509	pkt->skip_hdr (IP_OVERHEAD);
260		510
261	recv_vpn_packet (pkt, si);	511	recv_vpn_packet (pkt, si);
262	}	512	}
263	else	513	else
264	{	514	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	516	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	517	}
268		518
269	delete pkt;	519	delete pkt;
270	}	520	}
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	521	else
278	{	522	{
279	slog (L_ERR,	523	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	524	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	525	revents);
282	exit (1);	526	exit (EXIT_FAILURE);
283	}	527	}
284	}	528	}
285		529
		530	#if ENABLE_ICMP
286	void	531	void
287	vpn::ipv4_ev (int fd, short revents)	532	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	533	{
289	if (revents & (POLLIN \| POLLERR))	534	if (revents & EVENT_READ)
290	{	535	{
291	vpn_packet *pkt = new vpn_packet;	536	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	537	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	538	socklen_t sa_len = sizeof (sa);
294	int len;	539	int len;
295		540
296	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	541	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		542
298	sockinfo si(sa, PROT_IPv4);	543	sockinfo si(sa, PROT_ICMPv4);
299		544
300	if (len > 0)	545	if (len > 0)
301	{	546	{
302	pkt->len = len;	547	pkt->len = len;
303		548
		549	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		550
		551	if (hdr->type == ::conf.icmp_type
		552	&& hdr->code == 255)
		553	{
304	// 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
305	// this is slow, but...	555	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	556	pkt->skip_hdr (ICMP_OVERHEAD);
307		557
308	recv_vpn_packet (pkt, si);	558	recv_vpn_packet (pkt, si);
		559	}
309	}	560	}
310	else	561	else
311	{	562	{
312	// probably ECONNRESET or somesuch	563	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	564	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	565	}
315		566
316	delete pkt;	567	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	}	568	}
324	else	569	else
325	{	570	{
326	slog (L_ERR,	571	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	572	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	573	revents);
329	exit (1);	574	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	{	575	}
343	fd = -1;	576	}
		577	#endif
		578
		579	void
		580	vpn::udpv4_ev (io_watcher &w, short revents)
		581	{
		582	if (revents & EVENT_READ)
344	}	583	{
345		584	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;	585	struct sockaddr_in sa;
415	socklen_t sa_len = sizeof (sa);	586	socklen_t sa_len = sizeof (sa);
416	int len;	587	int len;
417		588
418	fd = accept (fd, (sockaddr *)&sa, &sa_len);	589	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
419		590
420	if (fd >= 0)
421	{
422	fcntl (fd, F_SETFL, O_NONBLOCK);
423
424	sockinfo si(sa, PROT_TCPv4);	591	sockinfo si(sa, PROT_UDPv4);
425	tcp_info *i = new tcp_info (this);
426		592
427	i->fd = fd;	593	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	}	594	{
434	}	595	pkt->len = len;
435	}
436		596
437	void	597	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	{	598	}
446	tcp_info *i = info->second;	599	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	}	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
465	}	608	{
		609	slog (L_ERR,
		610	_("FATAL: unknown revents %08x in socket, terminating\n"),
		611	revents);
		612	exit (EXIT_FAILURE);
		613	}
466	}	614	}
467		615
468	#endif
469
470	void	616	void
471	vpn::tap_ev (int fd, short revents)	617	vpn::tap_ev (io_watcher &w, short revents)
472	{	618	{
473	if (revents & POLLIN)	619	if (revents & EVENT_READ)
474	{	620	{
475	/* process data */	621	/* process data */
476	tap_packet *pkt;	622	tap_packet *pkt;
477		623
478	pkt = tap->recv ();	624	pkt = tap->recv ();
479		625
		626	if (!pkt)
		627	return;
		628
		629	if (pkt->len > 14)
		630	{
480	int dst = mac2id (pkt->dst);	631	int dst = mac2id (pkt->dst);
481	int src = mac2id (pkt->src);	632	int src = mac2id (pkt->src);
482		633
483	if (src != THISNODE->id)	634	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	{	635	{
501	// unicast	636	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
502	if (dst != THISNODE->id)	637	exit (EXIT_FAILURE);
503	conns[dst - 1]->inject_data_packet (pkt);
504	}	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);
505	else	648	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);	649	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	}	650	}
518		651
519	delete pkt;	652	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	}	653	}
526	else	654	else
527	abort ();	655	abort ();
528	}	656	}
529		657
530	void	658	void
531	vpn::event_cb (tstamp &ts)	659	vpn::event_cb (time_watcher &w)
532	{	660	{
533	if (events)	661	if (events)
534	{	662	{
535	if (events & EVENT_SHUTDOWN)	663	if (events & EVENT_SHUTDOWN)
536	{	664	{
537	slog (L_INFO, _("preparing shutdown..."));	665	slog (L_INFO, _("preparing shutdown..."));
538		666
539	shutdown_all ();	667	shutdown_all ();
540
541	remove_pid (pidfilename);	668	remove_pid (conf.pidfilename);
542
543	slog (L_INFO, _("terminating"));	669	slog (L_INFO, _("terminating"));
544		670	exit (EXIT_SUCCESS);
545	exit (0);
546	}	671	}
547		672
548	if (events & EVENT_RECONNECT)	673	if (events & EVENT_RECONNECT)
549	{	674	{
550	slog (L_INFO, _("forced reconnect"));	675	slog (L_INFO, _("forced reconnect"));
…		…
552	reconnect_all ();	677	reconnect_all ();
553	}	678	}
554		679
555	events = 0;	680	events = 0;
556	}	681	}
557
558	ts = TSTAMP_CANCEL;
559	}	682	}
560		683
561	void	684	void
562	vpn::shutdown_all ()	685	vpn::shutdown_all ()
563	{	686	{
…		…
576	connection_init ();	699	connection_init ();
577		700
578	for (configuration::node_vector::iterator i = conf.nodes.begin ();	701	for (configuration::node_vector::iterator i = conf.nodes.begin ();
579	i != conf.nodes.end (); ++i)	702	i != conf.nodes.end (); ++i)
580	{	703	{
581	connection *conn = new connection (this);	704	connection conn = new connection (this, i);
582
583	conn->conf = *i;
584	conns.push_back (conn);	705	conns.push_back (conn);
585
586	conn->establish_connection ();	706	conn->establish_connection ();
587	}	707	}
588	}	708	}
589		709
590	connection *vpn::find_router ()	710	connection *vpn::find_router ()
591	{	711	{
592	u32 prio = 0;	712	u32 prio = 1;
593	connection *router = 0;	713	connection *router = 0;
594		714
595	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	715	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596	{	716	{
597	connection c = i;	717	connection c = i;
598		718
599	if (c->conf->routerprio > prio	719	if (c->conf->routerprio > prio
600	&& c->connectmode == conf_node::C_ALWAYS	720	&& 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)	721	&& c->ictx && c->octx
		722	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603	{	723	{
604	prio = c->conf->routerprio;	724	prio = c->conf->routerprio;
605	router = c;	725	router = c;
606	}	726	}
607	}	727	}
608		728
609	return router;	729	return router;
610	}	730	}
611		731
612	void vpn::connect_request (int id)	732	void vpn::send_connect_request (int id)
613	{	733	{
614	connection *c = find_router ();	734	connection *c = find_router ();
615		735
616	if (c)	736	if (c)
617	c->connect_request (id);	737	c->send_connect_request (id);
618	//else // does not work, because all others must connect to the same router	738	else
619	// // no router found, aggressively connect to all routers	739	// no router found, aggressively connect to all routers
620	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	740	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621	// if ((*i)->conf->routerprio)	741	if ((i)->conf->routerprio && (i)->conf != THISNODE)
622	// (*i)->establish_connection ();	742	(*i)->establish_connection ();
623	}	743	}
624		744
625	void	745	void
626	connection::dump_status ()	746	connection::dump_status ()
627	{	747	{
…		…
644		764
645	slog (L_NOTICE, _("END status dump"));	765	slog (L_NOTICE, _("END status dump"));
646	}	766	}
647		767
648	vpn::vpn (void)	768	vpn::vpn (void)
649	: event(this, &vpn::event_cb)	769	: event (this, &vpn::event_cb)
650	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	770	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	771	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652	, tap_ev_watcher (this, &vpn::tap_ev)
653	#if ENABLE_TCP	772	#if ENABLE_TCP
654	, tcpv4_accept_watcher(this, &vpn::tcpv4_accept)	773	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655	#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)
656	{	782	{
657	}	783	}
658		784
659	vpn::~vpn ()	785	vpn::~vpn ()
660	{	786	{

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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 1.38 by pcg, Tue Apr 26 00:55:56 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 1.38 by pcg, Tue Apr 26 00:55:56 2005 UTC