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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 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) 2003-2007 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 (int)	51	static void inline
		52	set_tos (int fd, int &tos_prev, int tos)
		53	{
		54	#if defined(SOL_IP) && defined(IP_TOS)
		55	if (tos_prev == tos)
		56	return;
		57
		58	tos_prev = tos;
		59	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		60	#endif
		61	}
		62
		63	void
		64	vpn::script_init_env ()
46	{	65	{
47	// the tunnel device mtu should be the physical mtu - overhead	66	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	67	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		72
54	char *env;	73	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	74	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 ());	75	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	76	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		77	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	78	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);	79	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	80	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);
68	putenv (env);
69		81
		82	conns [THISNODE->id - 1]->script_init_env ("");
		83
		84	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		85	{
		86	char ext[16];
		87	snprintf (ext, 16, "_%d", (*c)->conf->id);
		88	(*c)->script_init_env (ext);
		89	}
		90	}
		91
		92	const char *vpn::script_if_init ()
		93	{
		94	script_init_env ();
		95
		96	return tap->if_up ();
		97	}
		98
		99	const char *vpn::script_if_up ()
		100	{
		101	script_init_env ();
		102
		103	char *filename;
		104	asprintf (&filename,
		105	"%s/%s",
		106	confbase,
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	107	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		108
		109	return filename;
71	}	110	}
72		111
73	int	112	int
74	vpn::setup ()	113	vpn::setup ()
75	{	114	{
76	sockinfo si;	115	ipv4_tos = -1;
		116	ipv4_fd = -1;
77		117
78	si.set (THISNODE);	118	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		119	{
		120	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
79		121
		122	if (ipv4_fd < 0)
		123	return -1;
		124
		125	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		126	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		127
		128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		129	// this I really consider a linux bug. I am neither connected
		130	// nor do I fragment myself. Linux still sets DF and doesn't
		131	// fragment for me sometimes.
		132	{
		133	int oval = IP_PMTUDISC_DONT;
		134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		135	}
		136	#endif
		137
		138	sockinfo si (THISNODE, PROT_IPv4);
		139
		140	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
		146	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		147	}
		148
		149	udpv4_tos = -1;
80	udpv4_fd = -1;	150	udpv4_fd = -1;
81		151
82	if (THISNODE->protocols & PROT_UDPv4)	152	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	153	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	154	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		155
86	if (udpv4_fd < 0)	156	if (udpv4_fd < 0)
87	return -1;	157	return -1;
88		158
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	159	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		160	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
		161
		162	// standard daemon practise...
90	{	163	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	164	int oval = 1;
92	exit (1);	165	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	166	}
94		167
95	#ifdef IP_MTU_DISCOVER	168	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	169	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	170	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	171	// fragment for me sometimes.
99	{	172	{
100	int oval = IP_PMTUDISC_DONT;	173	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	174	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	175	}
103	#endif	176	#endif
104		177
105	// standard daemon practise...	178	sockinfo si (THISNODE, PROT_UDPv4);
		179
		180	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		181	{
		182	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		183	exit (EXIT_FAILURE);
		184	}
		185
		186	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		187	}
		188
		189	icmpv4_tos = -1;
		190	icmpv4_fd = -1;
		191
		192	#if ENABLE_ICMP
		193	if (THISNODE->protocols & PROT_ICMPv4)
		194	{
		195	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		196
		197	if (icmpv4_fd < 0)
		198	return -1;
		199
		200	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		201	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		202
		203	#ifdef ICMP_FILTER
106	{	204	{
107	int oval = 1;	205	icmp_filter oval;
		206	oval.data = 0xffffffff;
		207	if (::conf.icmp_type < 32)
		208	oval.data &= ~(1 << ::conf.icmp_type);
		209
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	210	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	211	}
		212	#endif
110		213
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	214	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
112	}
113
114	ipv4_fd = -1;
115	if (THISNODE->protocols & PROT_IPv4)
116	{
117	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
118
119	if (ipv4_fd < 0)
120	return -1;
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{
124	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
125	exit (1);
126	}
127
128	#ifdef IP_MTU_DISCOVER
129	// this I really consider a linux bug. I am neither connected	215	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	216	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	217	// fragment for me sometimes.
132	{	218	{
133	int oval = IP_PMTUDISC_DONT;	219	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	220	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	221	}
136	#endif	222	#endif
137		223
		224	sockinfo si (THISNODE, PROT_ICMPv4);
		225
		226	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		227	{
		228	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		229	exit (EXIT_FAILURE);
		230	}
		231
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	232	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		233	}
		234	#endif
		235
		236	tcpv4_fd = -1;
		237
		238	#if ENABLE_TCP
		239	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		240	{
		241	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		242
		243	if (tcpv4_fd < 0)
		244	return -1;
		245
		246	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		247	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		248
		249	// standard daemon practise...
		250	{
		251	int oval = 1;
		252	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	253	}
		254
		255	sockinfo si (THISNODE, PROT_TCPv4);
		256
		257	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		258	{
		259	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		260	exit (EXIT_FAILURE);
		261	}
		262
		263	if (listen (tcpv4_fd, 5))
		264	{
		265	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		266	exit (EXIT_FAILURE);
		267	}
		268
		269	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		270	}
		271	#endif
		272
		273	dnsv4_tos = -1;
		274	dnsv4_fd = -1;
		275
		276	#if ENABLE_DNS
		277	if (THISNODE->protocols & PROT_DNSv4)
		278	{
		279	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		280
		281	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		282
		283	if (dnsv4_fd < 0)
		284	return -1;
		285
		286	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		287	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		288
		289	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		290	// this I really consider a linux bug. I am neither connected
		291	// nor do I fragment myself. Linux still sets DF and doesn't
		292	// fragment for me sometimes.
		293	{
		294	int oval = IP_PMTUDISC_DONT;
		295	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		296	}
		297	# endif
		298
		299	// standard daemon practise...
		300	{
		301	int oval = 1;
		302	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		303	}
		304
		305	sockinfo si (THISNODE->dns_hostname,
		306	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		307	PROT_DNSv4);
		308
		309	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		310	{
		311	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		312	exit (EXIT_FAILURE);
		313	}
		314
		315	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		316	}
		317	#endif
		318
		319	/////////////////////////////////////////////////////////////////////////////
		320
		321	reconnect_all ();
		322
		323	/////////////////////////////////////////////////////////////////////////////
140		324
141	tap = new tap_device ();	325	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	326	if (!tap) //D this, of course, never catches
143	{	327	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	328	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	329	exit (EXIT_FAILURE);
146	}	330	}
147		331
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	332	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		333
		334	run_script_cb cb;
		335
		336	callback_set (cb, this, vpn, script_if_init);
		337	if (tap->if_up () &&
		338	!run_script (cb, true))
		339	{
		340	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		341	tap->if_up ());
		342	exit (EXIT_FAILURE);
		343	}
		344
		345	callback_set (cb, this, vpn, script_if_up);
		346	if (!run_script (cb, true))
		347	{
		348	slog (L_ERR, _("if-up command execution failed, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
150	tap_ev_watcher.start (tap->fd, POLLIN);	352	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		353
154	return 0;	354	return 0;
155	}	355	}
156		356
157	void	357	bool
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	358	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
159	{	359	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	360	set_tos (ipv4_fd, ipv4_tos, tos);
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	361	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
162	}
163		362
164	void	363	return true;
		364	}
		365
		366	static u16
		367	ipv4_checksum (u16 *data, unsigned int len)
		368	{
		369	// use 32 bit accumulator and fold back carry bits at the end
		370	u32 sum = 0;
		371
		372	while (len > 1)
		373	{
		374	sum += *data++;
		375	len -= 2;
		376	}
		377
		378	// odd byte left?
		379	if (len)
		380	sum += (u8 )data;
		381
		382	// add back carry bits
		383	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		384	sum += (sum >> 16); // carry
		385
		386	return ~sum;
		387	}
		388
		389	#if ENABLE_ICMP
		390	bool
		391	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		392	{
		393	pkt->unshift_hdr (4);
		394
		395	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		396	hdr->type = ::conf.icmp_type;
		397	hdr->code = 255;
		398	hdr->checksum = 0;
		399	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		400
		401	set_tos (icmpv4_fd, icmpv4_tos, tos);
		402	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		403
		404	return true;
		405	}
		406	#endif
		407
		408	bool
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	409	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
166	{	410	{
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	411	set_tos (udpv4_fd, udpv4_tos, tos);
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	412	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		413
		414	return true;
		415	}
		416
		417	void
		418	vpn::inject_data_packet (tap_packet *pkt, int dst)
		419	{
		420	if (dst)
		421	{
		422	// unicast
		423	if (dst != THISNODE->id)
		424	conns[dst - 1]->inject_data_packet (pkt);
		425	}
		426	else
		427	{
		428	// broadcast, this is ugly, but due to the security policy
		429	// we have to connect to all hosts...
		430	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		431	if ((*c)->conf != THISNODE)
		432	(*c)->inject_data_packet (pkt, true);
		433	}
169	}	434	}
170		435
171	void	436	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	437	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	438	{
180	if (src == 0 \|\| src > conns.size ()	445	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	446	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	447	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	448	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	449	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		450	else if (dst > conns.size ())
		451	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		452	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	453	else
186	{	454	{
187	connection *c = conns[src - 1];	455	connection *c = conns[src - 1];
188		456
189	if (dst == 0 && !THISNODE->routerprio)	457	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	458	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	459	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	460	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	461	{
		462	if (THISNODE->routerprio)
		463	// the tos setting gets lost here. who cares.
		464	conns[dst - 1]->inject_vpn_packet (pkt);
		465	else
194	slog (L_WARN,	466	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	467	_("%s(%s): forwarding request (=> %s), but we are no router"),
		468	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	469	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	470	}
198	THISNODE->id, THISNODE->nodename);
199	else	471	else
200	c->recv_vpn_packet (pkt, rsi);	472	c->recv_vpn_packet (pkt, rsi);
201	}	473	}
202	}	474	}
203		475
204	void	476	bool
205	vpn::udpv4_ev (short revents)	477	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	478	{
207	if (revents & (POLLIN \| POLLERR))	479	switch (si.prot)
		480	{
		481	case PROT_IPv4:
		482	return send_ipv4_packet (pkt, si, tos);
		483
		484	case PROT_UDPv4:
		485	return send_udpv4_packet (pkt, si, tos);
		486
		487	#if ENABLE_TCP
		488	case PROT_TCPv4:
		489	return send_tcpv4_packet (pkt, si, tos);
		490	#endif
		491	#if ENABLE_ICMP
		492	case PROT_ICMPv4:
		493	return send_icmpv4_packet (pkt, si, tos);
		494	#endif
		495	#if ENABLE_DNS
		496	case PROT_DNSv4:
		497	return send_dnsv4_packet (pkt, si, tos);
		498	#endif
		499	default:
		500	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		501	}
		502
		503	return false;
		504	}
		505
		506	void
		507	vpn::ipv4_ev (ev::io &w, int revents)
		508	{
		509	if (revents & EV_READ)
208	{	510	{
209	vpn_packet *pkt = new vpn_packet;	511	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	512	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	513	socklen_t sa_len = sizeof (sa);
212	int len;	514	int len;
213		515
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	516	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		517
216	sockinfo si(sa);	518	sockinfo si(sa, PROT_IPv4);
217		519
218	if (len > 0)	520	if (len > 0)
219	{	521	{
220	pkt->len = len;	522	pkt->len = len;
		523
		524	// raw sockets deliver the ipv4 header, but don't expect it on sends
		525	pkt->skip_hdr (IP_OVERHEAD);
221		526
222	recv_vpn_packet (pkt, si);	527	recv_vpn_packet (pkt, si);
223	}	528	}
224	else	529	else
225	{	530	{
…		…
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	532	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	533	}
229		534
230	delete pkt;	535	delete pkt;
231	}	536	}
232	else if (revents & POLLHUP)
233	{
234	// this cannot ;) happen on udp sockets
235	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
236	exit (1);
237	}
238	else	537	else
239	{	538	{
240	slog (L_ERR,	539	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	540	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	541	revents);
243	exit (1);	542	exit (EXIT_FAILURE);
244	}	543	}
245	}	544	}
246		545
		546	#if ENABLE_ICMP
247	void	547	void
248	vpn::ipv4_ev (short revents)	548	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	549	{
250	if (revents & (POLLIN \| POLLERR))	550	if (revents & EV_READ)
251	{	551	{
252	vpn_packet *pkt = new vpn_packet;	552	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	553	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	554	socklen_t sa_len = sizeof (sa);
255	int len;	555	int len;
256		556
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	557	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		558
259	sockinfo si(sa, PROT_IPv4);	559	sockinfo si(sa, PROT_ICMPv4);
260		560
261	if (len > 0)	561	if (len > 0)
262	{	562	{
263	pkt->len = len;	563	pkt->len = len;
264		564
		565	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		566
		567	if (hdr->type == ::conf.icmp_type
		568	&& hdr->code == 255)
		569	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	570	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	571	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	572	pkt->skip_hdr (ICMP_OVERHEAD);
268		573
269	recv_vpn_packet (pkt, si);	574	recv_vpn_packet (pkt, si);
		575	}
270	}	576	}
271	else	577	else
272	{	578	{
273	// probably ECONNRESET or somesuch	579	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	580	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	581	}
276		582
277	delete pkt;	583	delete pkt;
278	}
279	else if (revents & POLLHUP)
280	{
281	// this cannot ;) happen on udp sockets
282	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
283	exit (1);
284	}	584	}
285	else	585	else
286	{	586	{
287	slog (L_ERR,	587	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	588	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	589	revents);
290	exit (1);	590	exit (EXIT_FAILURE);
		591	}
		592	}
		593	#endif
		594
		595	void
		596	vpn::udpv4_ev (ev::io &w, int revents)
		597	{
		598	if (revents & EV_READ)
291	}	599	{
292	}	600	vpn_packet *pkt = new vpn_packet;
		601	struct sockaddr_in sa;
		602	socklen_t sa_len = sizeof (sa);
		603	int len;
293		604
		605	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		606
		607	sockinfo si(sa, PROT_UDPv4);
		608
		609	if (len > 0)
		610	{
		611	pkt->len = len;
		612
		613	recv_vpn_packet (pkt, si);
		614	}
		615	else
		616	{
		617	// probably ECONNRESET or somesuch
		618	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		619	}
		620
		621	delete pkt;
		622	}
		623	else
		624	{
		625	slog (L_ERR,
		626	_("FATAL: unknown revents %08x in socket, terminating\n"),
		627	revents);
		628	exit (EXIT_FAILURE);
		629	}
		630	}
		631
294	void	632	void
295	vpn::tap_ev (short revents)	633	vpn::tap_ev (ev::io &w, int revents)
296	{	634	{
297	if (revents & POLLIN)	635	if (revents & EV_READ)
298	{	636	{
299	/* process data */	637	/* process data */
300	tap_packet *pkt;	638	tap_packet *pkt;
301		639
302	pkt = tap->recv ();	640	pkt = tap->recv ();
303		641
		642	if (!pkt)
		643	return;
		644
		645	if (pkt->len > 14)
		646	{
304	int dst = mac2id (pkt->dst);	647	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	648	int src = mac2id (pkt->src);
306		649
307	if (src != THISNODE->id)	650	if (src != THISNODE->id)
308	{
309	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
310	exit (1);
311	}
312
313	if (dst == THISNODE->id)
314	{
315	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
316	exit (1);
317	}
318
319	if (dst > conns.size ())
320	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
321	else
322	{
323	if (dst)
324	{	651	{
325	// unicast	652	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	653	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	654	}
		655
		656	if (dst == THISNODE->id)
		657	{
		658	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		659	exit (EXIT_FAILURE);
		660	}
		661
		662	if (dst > conns.size ())
		663	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	664	else
330	{
331	// broadcast, first check router, then self, then english
332	connection *router = find_router ();
333
334	if (router)
335	router->inject_data_packet (pkt, true);	665	inject_data_packet (pkt, dst);
336	else
337	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
338	if ((*c)->conf != THISNODE)
339	(*c)->inject_data_packet (pkt);
340	}
341	}	666	}
342		667
343	delete pkt;	668	delete pkt;
344	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}	669	}
350	else	670	else
351	abort ();	671	abort ();
352	}	672	}
353		673
354	void	674	void
355	vpn::event_cb (tstamp &ts)	675	vpn::event_cb (ev::timer &w, int)
356	{	676	{
357	if (events)	677	if (events)
358	{	678	{
359	if (events & EVENT_SHUTDOWN)	679	if (events & EVENT_SHUTDOWN)
360	{	680	{
361	slog (L_INFO, _("preparing shutdown..."));	681	slog (L_INFO, _("preparing shutdown..."));
362		682
363	shutdown_all ();	683	shutdown_all ();
364
365	remove_pid (pidfilename);	684	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	685	slog (L_INFO, _("terminating"));
368		686	exit (EXIT_SUCCESS);
369	exit (0);
370	}	687	}
371		688
372	if (events & EVENT_RECONNECT)	689	if (events & EVENT_RECONNECT)
373	{	690	{
374	slog (L_INFO, _("forced reconnect"));	691	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	693	reconnect_all ();
377	}	694	}
378		695
379	events = 0;	696	events = 0;
380	}	697	}
381
382	ts = TSTAMP_CANCEL;
383	}	698	}
384		699
385	void	700	void
386	vpn::shutdown_all ()	701	vpn::shutdown_all ()
387	{	702	{
…		…
400	connection_init ();	715	connection_init ();
401		716
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	717	for (configuration::node_vector::iterator i = conf.nodes.begin ();
403	i != conf.nodes.end (); ++i)	718	i != conf.nodes.end (); ++i)
404	{	719	{
405	connection *conn = new connection (this);	720	connection conn = new connection (this, i);
406
407	conn->conf = *i;
408	conns.push_back (conn);	721	conns.push_back (conn);
409
410	conn->establish_connection ();	722	conn->establish_connection ();
411	}	723	}
412	}	724	}
413		725
414	connection *vpn::find_router ()	726	connection *vpn::find_router ()
415	{	727	{
416	u32 prio = 0;	728	u32 prio = 1;
417	connection *router = 0;	729	connection *router = 0;
418		730
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	732	{
421	connection c = i;	733	connection c = i;
422		734
423	if (c->conf->routerprio > prio	735	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	736	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
425	&& c->conf != THISNODE
426	&& c->ictx && c->octx)	737	&& c->ictx && c->octx
		738	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	739	{
428	prio = c->conf->routerprio;	740	prio = c->conf->routerprio;
429	router = c;	741	router = c;
430	}	742	}
431	}	743	}
432		744
433	return router;	745	return router;
434	}	746	}
435		747
436	void vpn::connect_request (int id)	748	void vpn::send_connect_request (int id)
437	{	749	{
438	connection *c = find_router ();	750	connection *c = find_router ();
439		751
440	if (c)	752	if (c)
441	c->connect_request (id);	753	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	754	else
443	// // no router found, aggressively connect to all routers	755	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	756	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	757	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	758	(*i)->establish_connection ();
447	}	759	}
448		760
449	void	761	void
450	connection::dump_status ()	762	connection::dump_status ()
451	{	763	{
…		…
459	}	771	}
460		772
461	void	773	void
462	vpn::dump_status ()	774	vpn::dump_status ()
463	{	775	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	776	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		777
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	778	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	779	(*c)->dump_status ();
468		780
469	slog (L_NOTICE, _("END status dump"));	781	slog (L_NOTICE, _("END status dump"));
470	}	782	}
471		783
472	vpn::vpn (void)	784	vpn::vpn (void)
		785	: event (this, &vpn::event_cb)
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	786	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	787	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
		788	#if ENABLE_TCP
		789	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
		790	#endif
		791	#if ENABLE_ICMP
		792	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		793	#endif
		794	#if ENABLE_DNS
		795	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		796	#endif
475	, tap_ev_watcher(this, &vpn::tap_ev)	797	, tap_ev_watcher (this, &vpn::tap_ev)
476	, event(this, &vpn::event_cb)
477	{	798	{
478	}	799	}
479		800
480	vpn::~vpn ()	801	vpn::~vpn ()
481	{	802	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC