[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 1.45 by pcg, Thu Dec 6 00:35:29 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	inline const char *
		93	vpn::script_if_init ()
		94	{
		95	script_init_env ();
		96
		97	return tap->if_up ();
		98	}
		99
		100	inline const char *
		101	vpn::script_if_up ()
		102	{
		103	script_init_env ();
		104
		105	char *filename;
		106	asprintf (&filename,
		107	"%s/%s",
		108	confbase,
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	109	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		110
		111	return filename;
71	}	112	}
72		113
73	int	114	int
74	vpn::setup ()	115	vpn::setup ()
75	{	116	{
76	sockinfo si;	117	ipv4_tos = -1;
		118	ipv4_fd = -1;
77		119
78	si.set (THISNODE);	120	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		121	{
		122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
79		123
		124	if (ipv4_fd < 0)
		125	return -1;
		126
		127	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		128	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		129
		130	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		131	// this I really consider a linux bug. I am neither connected
		132	// nor do I fragment myself. Linux still sets DF and doesn't
		133	// fragment for me sometimes.
		134	{
		135	int oval = IP_PMTUDISC_DONT;
		136	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		137	}
		138	#endif
		139
		140	sockinfo si (THISNODE, PROT_IPv4);
		141
		142	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		143	{
		144	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		145	exit (EXIT_FAILURE);
		146	}
		147
		148	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		149	}
		150
		151	udpv4_tos = -1;
80	udpv4_fd = -1;	152	udpv4_fd = -1;
81		153
82	if (THISNODE->protocols & PROT_UDPv4)	154	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	155	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		157
86	if (udpv4_fd < 0)	158	if (udpv4_fd < 0)
87	return -1;	159	return -1;
88		160
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	161	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		162	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
		163
		164	// standard daemon practise...
90	{	165	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	166	int oval = 1;
92	exit (1);	167	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	168	}
94		169
95	#ifdef IP_MTU_DISCOVER	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	172	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	173	// fragment for me sometimes.
99	{	174	{
100	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	177	}
103	#endif	178	#endif
104		179
105	// standard daemon practise...	180	sockinfo si (THISNODE, PROT_UDPv4);
		181
		182	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		183	{
		184	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		185	exit (EXIT_FAILURE);
		186	}
		187
		188	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		189	}
		190
		191	icmpv4_tos = -1;
		192	icmpv4_fd = -1;
		193
		194	#if ENABLE_ICMP
		195	if (THISNODE->protocols & PROT_ICMPv4)
		196	{
		197	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		198
		199	if (icmpv4_fd < 0)
		200	return -1;
		201
		202	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		203	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		204
		205	#ifdef ICMP_FILTER
106	{	206	{
107	int oval = 1;	207	icmp_filter oval;
		208	oval.data = 0xffffffff;
		209	if (::conf.icmp_type < 32)
		210	oval.data &= ~(1 << ::conf.icmp_type);
		211
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	212	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	213	}
		214	#endif
110		215
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	216	#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	217	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	218	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	219	// fragment for me sometimes.
132	{	220	{
133	int oval = IP_PMTUDISC_DONT;	221	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	223	}
136	#endif	224	#endif
137		225
		226	sockinfo si (THISNODE, PROT_ICMPv4);
		227
		228	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		229	{
		230	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		231	exit (EXIT_FAILURE);
		232	}
		233
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	234	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		235	}
		236	#endif
		237
		238	tcpv4_fd = -1;
		239
		240	#if ENABLE_TCP
		241	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		242	{
		243	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		244
		245	if (tcpv4_fd < 0)
		246	return -1;
		247
		248	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		249	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
		250
		251	// standard daemon practise...
		252	{
		253	int oval = 1;
		254	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	255	}
		256
		257	sockinfo si (THISNODE, PROT_TCPv4);
		258
		259	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		260	{
		261	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		262	exit (EXIT_FAILURE);
		263	}
		264
		265	if (listen (tcpv4_fd, 5))
		266	{
		267	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		268	exit (EXIT_FAILURE);
		269	}
		270
		271	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		272	}
		273	#endif
		274
		275	dnsv4_tos = -1;
		276	dnsv4_fd = -1;
		277
		278	#if ENABLE_DNS
		279	if (THISNODE->protocols & PROT_DNSv4)
		280	{
		281	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		282
		283	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		284
		285	if (dnsv4_fd < 0)
		286	return -1;
		287
		288	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		289	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		290
		291	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		292	// this I really consider a linux bug. I am neither connected
		293	// nor do I fragment myself. Linux still sets DF and doesn't
		294	// fragment for me sometimes.
		295	{
		296	int oval = IP_PMTUDISC_DONT;
		297	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		298	}
		299	# endif
		300
		301	// standard daemon practise...
		302	{
		303	int oval = 1;
		304	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		305	}
		306
		307	sockinfo si (THISNODE->dns_hostname,
		308	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		309	PROT_DNSv4);
		310
		311	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		312	{
		313	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		314	exit (EXIT_FAILURE);
		315	}
		316
		317	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		318	}
		319	#endif
		320
		321	/////////////////////////////////////////////////////////////////////////////
		322
		323	reconnect_all ();
		324
		325	/////////////////////////////////////////////////////////////////////////////
140		326
141	tap = new tap_device ();	327	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	328	if (!tap) //D this, of course, never catches
143	{	329	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	330	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	331	exit (EXIT_FAILURE);
146	}	332	}
147		333
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	334	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
149		335
		336	run_script_cb cb;
		337	cb.set<vpn, &vpn::script_if_init> (this);
		338
		339	if (tap->if_up () &&
		340	!run_script (cb, true))
		341	{
		342	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		343	tap->if_up ());
		344	exit (EXIT_FAILURE);
		345	}
		346
		347	cb.set<vpn, &vpn::script_if_up> (this);
		348	if (!run_script (cb, true))
		349	{
		350	slog (L_ERR, _("if-up command execution failed, exiting."));
		351	exit (EXIT_FAILURE);
		352	}
		353
150	tap_ev_watcher.start (tap->fd, POLLIN);	354	tap_ev_watcher.start (tap->fd, EV_READ);
151
152	reconnect_all ();
153		355
154	return 0;	356	return 0;
155	}	357	}
156		358
		359	bool
		360	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		361	{
		362	set_tos (ipv4_fd, ipv4_tos, tos);
		363	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		364
		365	return true;
		366	}
		367
		368	static u16
		369	ipv4_checksum (u16 *data, unsigned int len)
		370	{
		371	// use 32 bit accumulator and fold back carry bits at the end
		372	u32 sum = 0;
		373
		374	while (len > 1)
		375	{
		376	sum += *data++;
		377	len -= 2;
		378	}
		379
		380	// odd byte left?
		381	if (len)
		382	sum += (u8 )data;
		383
		384	// add back carry bits
		385	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		386	sum += (sum >> 16); // carry
		387
		388	return ~sum;
		389	}
		390
		391	#if ENABLE_ICMP
		392	bool
		393	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		394	{
		395	pkt->unshift_hdr (4);
		396
		397	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		398	hdr->type = ::conf.icmp_type;
		399	hdr->code = 255;
		400	hdr->checksum = 0;
		401	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		402
		403	set_tos (icmpv4_fd, icmpv4_tos, tos);
		404	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		405
		406	return true;
		407	}
		408	#endif
		409
		410	bool
		411	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		412	{
		413	set_tos (udpv4_fd, udpv4_tos, tos);
		414	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		415
		416	return true;
		417	}
		418
157	void	419	void
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	420	vpn::inject_data_packet (tap_packet *pkt, int dst)
159	{	421	{
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	422	if (dst)
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	423	{
162	}	424	// unicast
163		425	if (dst != THISNODE->id)
164	void	426	conns[dst - 1]->inject_data_packet (pkt);
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	427	}
166	{	428	else
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	429	{
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	430	// broadcast, this is ugly, but due to the security policy
		431	// we have to connect to all hosts...
		432	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		433	if ((*c)->conf != THISNODE)
		434	(*c)->inject_data_packet (pkt, true);
		435	}
169	}	436	}
170		437
171	void	438	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	439	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	440	{
180	if (src == 0 \|\| src > conns.size ()	447	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	448	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	449	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	450	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	451	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		452	else if (dst > conns.size ())
		453	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		454	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	455	else
186	{	456	{
187	connection *c = conns[src - 1];	457	connection *c = conns[src - 1];
188		458
189	if (dst == 0 && !THISNODE->routerprio)	459	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	460	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	461	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	462	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	463	{
		464	if (THISNODE->routerprio)
		465	// the tos setting gets lost here. who cares.
		466	conns[dst - 1]->inject_vpn_packet (pkt);
		467	else
194	slog (L_WARN,	468	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	469	_("%s(%s): forwarding request (=> %s), but we are no router"),
		470	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	471	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	472	}
198	THISNODE->id, THISNODE->nodename);
199	else	473	else
200	c->recv_vpn_packet (pkt, rsi);	474	c->recv_vpn_packet (pkt, rsi);
201	}	475	}
202	}	476	}
203		477
204	void	478	bool
205	vpn::udpv4_ev (short revents)	479	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
206	{	480	{
207	if (revents & (POLLIN \| POLLERR))	481	switch (si.prot)
		482	{
		483	case PROT_IPv4:
		484	return send_ipv4_packet (pkt, si, tos);
		485
		486	case PROT_UDPv4:
		487	return send_udpv4_packet (pkt, si, tos);
		488
		489	#if ENABLE_TCP
		490	case PROT_TCPv4:
		491	return send_tcpv4_packet (pkt, si, tos);
		492	#endif
		493	#if ENABLE_ICMP
		494	case PROT_ICMPv4:
		495	return send_icmpv4_packet (pkt, si, tos);
		496	#endif
		497	#if ENABLE_DNS
		498	case PROT_DNSv4:
		499	return send_dnsv4_packet (pkt, si, tos);
		500	#endif
		501	default:
		502	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		503	}
		504
		505	return false;
		506	}
		507
		508	inline void
		509	vpn::ipv4_ev (ev::io &w, int revents)
		510	{
		511	if (revents & EV_READ)
208	{	512	{
209	vpn_packet *pkt = new vpn_packet;	513	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	514	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	515	socklen_t sa_len = sizeof (sa);
212	int len;	516	int len;
213		517
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	518	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		519
216	sockinfo si(sa);	520	sockinfo si(sa, PROT_IPv4);
217		521
218	if (len > 0)	522	if (len > 0)
219	{	523	{
220	pkt->len = len;	524	pkt->len = len;
		525
		526	// raw sockets deliver the ipv4 header, but don't expect it on sends
		527	pkt->skip_hdr (IP_OVERHEAD);
221		528
222	recv_vpn_packet (pkt, si);	529	recv_vpn_packet (pkt, si);
223	}	530	}
224	else	531	else
225	{	532	{
…		…
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	534	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	535	}
229		536
230	delete pkt;	537	delete pkt;
231	}	538	}
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	539	else
239	{	540	{
240	slog (L_ERR,	541	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	542	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	543	revents);
243	exit (1);	544	exit (EXIT_FAILURE);
244	}	545	}
245	}	546	}
246		547
247	void	548	#if ENABLE_ICMP
248	vpn::ipv4_ev (short revents)	549	inline void
		550	vpn::icmpv4_ev (ev::io &w, int revents)
249	{	551	{
250	if (revents & (POLLIN \| POLLERR))	552	if (revents & EV_READ)
251	{	553	{
252	vpn_packet *pkt = new vpn_packet;	554	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	555	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	556	socklen_t sa_len = sizeof (sa);
255	int len;	557	int len;
256		558
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	559	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		560
259	sockinfo si(sa, PROT_IPv4);	561	sockinfo si(sa, PROT_ICMPv4);
260		562
261	if (len > 0)	563	if (len > 0)
262	{	564	{
263	pkt->len = len;	565	pkt->len = len;
264		566
		567	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		568
		569	if (hdr->type == ::conf.icmp_type
		570	&& hdr->code == 255)
		571	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	572	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	573	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	574	pkt->skip_hdr (ICMP_OVERHEAD);
268		575
269	recv_vpn_packet (pkt, si);	576	recv_vpn_packet (pkt, si);
		577	}
270	}	578	}
271	else	579	else
272	{	580	{
273	// probably ECONNRESET or somesuch	581	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	582	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	583	}
276		584
277	delete pkt;	585	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	}	586	}
285	else	587	else
286	{	588	{
287	slog (L_ERR,	589	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	590	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	591	revents);
290	exit (1);	592	exit (EXIT_FAILURE);
		593	}
		594	}
		595	#endif
		596
		597	inline void
		598	vpn::udpv4_ev (ev::io &w, int revents)
		599	{
		600	if (revents & EV_READ)
291	}	601	{
292	}	602	vpn_packet *pkt = new vpn_packet;
		603	struct sockaddr_in sa;
		604	socklen_t sa_len = sizeof (sa);
		605	int len;
293		606
294	void	607	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		608
		609	sockinfo si(sa, PROT_UDPv4);
		610
		611	if (len > 0)
		612	{
		613	pkt->len = len;
		614
		615	recv_vpn_packet (pkt, si);
		616	}
		617	else
		618	{
		619	// probably ECONNRESET or somesuch
		620	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		621	}
		622
		623	delete pkt;
		624	}
		625	else
		626	{
		627	slog (L_ERR,
		628	_("FATAL: unknown revents %08x in socket, terminating\n"),
		629	revents);
		630	exit (EXIT_FAILURE);
		631	}
		632	}
		633
		634	inline void
295	vpn::tap_ev (short revents)	635	vpn::tap_ev (ev::io &w, int revents)
296	{	636	{
297	if (revents & POLLIN)	637	if (revents & EV_READ)
298	{	638	{
299	/* process data */	639	/* process data */
300	tap_packet *pkt;	640	tap_packet *pkt;
301		641
302	pkt = tap->recv ();	642	pkt = tap->recv ();
303		643
		644	if (!pkt)
		645	return;
		646
		647	if (pkt->len > 14)
		648	{
304	int dst = mac2id (pkt->dst);	649	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	650	int src = mac2id (pkt->src);
306		651
307	if (src != THISNODE->id)	652	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	{	653	{
325	// unicast	654	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	655	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	656	}
		657
		658	if (dst == THISNODE->id)
		659	{
		660	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		661	exit (EXIT_FAILURE);
		662	}
		663
		664	if (dst > conns.size ())
		665	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	666	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);	667	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	}	668	}
342		669
343	delete pkt;	670	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	}	671	}
350	else	672	else
351	abort ();	673	abort ();
352	}	674	}
353		675
354	void	676	inline void
355	vpn::event_cb (tstamp &ts)	677	vpn::event_cb (ev::timer &w, int)
356	{	678	{
357	if (events)	679	if (events)
358	{	680	{
359	if (events & EVENT_SHUTDOWN)	681	if (events & EVENT_SHUTDOWN)
360	{	682	{
361	slog (L_INFO, _("preparing shutdown..."));	683	slog (L_INFO, _("preparing shutdown..."));
362		684
363	shutdown_all ();	685	shutdown_all ();
364
365	remove_pid (pidfilename);	686	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	687	slog (L_INFO, _("terminating"));
368		688	exit (EXIT_SUCCESS);
369	exit (0);
370	}	689	}
371		690
372	if (events & EVENT_RECONNECT)	691	if (events & EVENT_RECONNECT)
373	{	692	{
374	slog (L_INFO, _("forced reconnect"));	693	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	695	reconnect_all ();
377	}	696	}
378		697
379	events = 0;	698	events = 0;
380	}	699	}
381
382	ts = TSTAMP_CANCEL;
383	}	700	}
384		701
385	void	702	void
386	vpn::shutdown_all ()	703	vpn::shutdown_all ()
387	{	704	{
…		…
400	connection_init ();	717	connection_init ();
401		718
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	719	for (configuration::node_vector::iterator i = conf.nodes.begin ();
403	i != conf.nodes.end (); ++i)	720	i != conf.nodes.end (); ++i)
404	{	721	{
405	connection *conn = new connection (this);	722	connection conn = new connection (this, i);
406
407	conn->conf = *i;
408	conns.push_back (conn);	723	conns.push_back (conn);
409
410	conn->establish_connection ();	724	conn->establish_connection ();
411	}	725	}
412	}	726	}
413		727
414	connection *vpn::find_router ()	728	connection *vpn::find_router ()
415	{	729	{
416	u32 prio = 0;	730	u32 prio = 1;
417	connection *router = 0;	731	connection *router = 0;
418		732
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	733	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	734	{
421	connection c = i;	735	connection c = i;
422		736
423	if (c->conf->routerprio > prio	737	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	738	&& 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)	739	&& c->ictx && c->octx
		740	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	741	{
428	prio = c->conf->routerprio;	742	prio = c->conf->routerprio;
429	router = c;	743	router = c;
430	}	744	}
431	}	745	}
432		746
433	return router;	747	return router;
434	}	748	}
435		749
436	void vpn::connect_request (int id)	750	void vpn::send_connect_request (int id)
437	{	751	{
438	connection *c = find_router ();	752	connection *c = find_router ();
439		753
440	if (c)	754	if (c)
441	c->connect_request (id);	755	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	756	else
443	// // no router found, aggressively connect to all routers	757	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	758	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	759	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	760	(*i)->establish_connection ();
447	}	761	}
448		762
449	void	763	void
450	connection::dump_status ()	764	connection::dump_status ()
451	{	765	{
…		…
459	}	773	}
460		774
461	void	775	void
462	vpn::dump_status ()	776	vpn::dump_status ()
463	{	777	{
464	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	778	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
465		779
466	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	780	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
467	(*c)->dump_status ();	781	(*c)->dump_status ();
468		782
469	slog (L_NOTICE, _("END status dump"));	783	slog (L_NOTICE, _("END status dump"));
470	}	784	}
471		785
472	vpn::vpn (void)	786	vpn::vpn (void)
		787	{
		788	event .set<vpn, &vpn::event_cb > (this);
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	789	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	790	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
475	, tap_ev_watcher(this, &vpn::tap_ev)	791	#if ENABLE_TCP
476	, event(this, &vpn::event_cb)	792	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
477	{	793	#endif
		794	#if ENABLE_ICMP
		795	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		796	#endif
		797	#if ENABLE_DNS
		798	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		799	#endif
		800	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
478	}	801	}
479		802
480	vpn::~vpn ()	803	vpn::~vpn ()
481	{	804	{
482	}	805	}

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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 1.45 by pcg, Thu Dec 6 00:35:29 2007 UTC

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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 1.45 by pcg, Thu Dec 6 00:35:29 2007 UTC