[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 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	33	#include <errno.h>
34	#include <time.h>	34	#include <time.h>
35	#include <unistd.h>	35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <sys/socket.h>
		38
		39	#include "netcompat.h"
36		40
37	#include "pidfile.h"	41	#include "pidfile.h"
38		42
39	#include "connection.h"	43	#include "connection.h"
40	#include "util.h"	44	#include "util.h"
41	#include "vpn.h"	45	#include "vpn.h"
42		46
		47	vpn network; // THE vpn (bad design...)
		48
43	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
44		50
45	const char *vpn::script_if_up (int)	51	const char *vpn::script_if_up ()
46	{	52	{
47	// the tunnel device mtu should be the physical mtu - overhead	53	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	54	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	55	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		59
54	char *env;	60	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
68	putenv (env);	71	putenv (env);
69		72
71	}	74	}
72		75
73	int	76	int
74	vpn::setup ()	77	vpn::setup ()
75	{	78	{
76	sockinfo si;	79	ipv4_fd = -1;
77		80
78	si.set (THISNODE);	81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		82	{
		83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		84
		85	if (ipv4_fd < 0)
		86	return -1;
		87
		88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		91	// this I really consider a linux bug. I am neither connected
		92	// nor do I fragment myself. Linux still sets DF and doesn't
		93	// fragment for me sometimes.
		94	{
		95	int oval = IP_PMTUDISC_DONT;
		96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		97	}
		98	#endif
		99
		100	sockinfo si (THISNODE, PROT_IPv4);
		101
		102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		103	{
		104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		105	exit (EXIT_FAILURE);
		106	}
		107
		108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		109	}
79		110
80	udpv4_fd = -1;	111	udpv4_fd = -1;
81		112
82	if (THISNODE->protocols & PROT_UDPv4)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	114	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		116
86	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
87	return -1;	118	return -1;
88		119
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		121
		122	// standard daemon practise...
90	{	123	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	124	int oval = 1;
92	exit (1);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	126	}
94		127
95	#ifdef IP_MTU_DISCOVER	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	130	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	131	// fragment for me sometimes.
99	{	132	{
100	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	135	}
103	#endif	136	#endif
104		137
105	// standard daemon practise...	138	sockinfo si (THISNODE, PROT_UDPv4);
		139
		140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
		146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		147	}
		148
		149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
		152	if (THISNODE->protocols & PROT_ICMPv4)
		153	{
		154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		155
		156	if (icmpv4_fd < 0)
		157	return -1;
		158
		159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		160
		161	#ifdef ICMP_FILTER
106	{	162	{
107	int oval = 1;	163	icmp_filter oval;
		164	oval.data = 0xffffffff;
		165	if (::conf.icmp_type < 32)
		166	oval.data &= ~(1 << ::conf.icmp_type);
		167
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	169	}
		170	#endif
110		171
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	172	#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	173	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	174	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	175	// fragment for me sometimes.
132	{	176	{
133	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	179	}
136	#endif	180	#endif
137		181
		182	sockinfo si (THISNODE, PROT_ICMPv4);
		183
		184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		185	{
		186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		187	exit (EXIT_FAILURE);
		188	}
		189
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		191	}
		192	#endif
		193
		194	tcpv4_fd = -1;
		195
		196	#if ENABLE_TCP
		197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		198	{
		199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		200
		201	if (tcpv4_fd < 0)
		202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		205
		206	// standard daemon practise...
		207	{
		208	int oval = 1;
		209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	210	}
		211
		212	sockinfo si (THISNODE, PROT_TCPv4);
		213
		214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		215	{
		216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		217	exit (EXIT_FAILURE);
		218	}
		219
		220	if (listen (tcpv4_fd, 5))
		221	{
		222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		234
		235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		236
		237	if (dnsv4_fd < 0)
		238	return -1;
		239
		240	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		241	// this I really consider a linux bug. I am neither connected
		242	// nor do I fragment myself. Linux still sets DF and doesn't
		243	// fragment for me sometimes.
		244	{
		245	int oval = IP_PMTUDISC_DONT;
		246	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		247	}
		248	#endif
		249
		250	// standard daemon practise...
		251	{
		252	int oval = 1;
		253	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		254	}
		255
		256	sockinfo si (THISNODE->dns_hostname,
		257	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		258	PROT_DNSv4);
		259
		260	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		261	{
		262	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		263	exit (EXIT_FAILURE);
		264	}
		265
		266	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		267	}
		268	#endif
140		269
141	tap = new tap_device ();	270	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	271	if (!tap) //D this, of course, never catches
143	{	272	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	273	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	274	exit (EXIT_FAILURE);
146	}	275	}
147		276
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	277	run_script (run_script_cb (this, &vpn::script_if_up), true);
149		278
150	tap_ev_watcher.start (tap->fd, POLLIN);	279	tap_ev_watcher.start (tap->fd, EVENT_READ);
151		280
152	reconnect_all ();	281	reconnect_all ();
153		282
154	return 0;	283	return 0;
155	}	284	}
156		285
157	void	286	bool
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	287	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
159	{	288	{
		289	#if defined(SOL_IP) && defined(IP_TOS)
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	290	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		291	#endif
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	292	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
162	}
163		293
164	void	294	return true;
		295	}
		296
		297	static u16
		298	ipv4_checksum (u16 *data, unsigned int len)
		299	{
		300	// use 32 bit accumulator and fold back carry bits at the end
		301	u32 sum = 0;
		302
		303	while (len > 1)
		304	{
		305	sum += *data++;
		306	len -= 2;
		307	}
		308
		309	// odd byte left?
		310	if (len)
		311	sum += (u8 )data;
		312
		313	// add back carry bits
		314	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		315	sum += (sum >> 16); // carry
		316
		317	return ~sum;
		318	}
		319
		320	#if ENABLE_ICMP
		321	bool
		322	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		323	{
		324	#if defined(SOL_IP) && defined(IP_TOS)
		325	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		326	#endif
		327
		328	pkt->unshift_hdr (4);
		329
		330	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		331	hdr->type = ::conf.icmp_type;
		332	hdr->code = 255;
		333	hdr->checksum = 0;
		334	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		335
		336	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		337
		338	return true;
		339	}
		340	#endif
		341
		342	bool
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	343	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
166	{	344	{
		345	#if defined(SOL_IP) && defined(IP_TOS)
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	346	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		347	#endif
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	348	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		349
		350	return true;
		351	}
		352
		353	void
		354	vpn::inject_data_packet (tap_packet *pkt, int dst)
		355	{
		356	if (dst)
		357	{
		358	// unicast
		359	if (dst != THISNODE->id)
		360	conns[dst - 1]->inject_data_packet (pkt);
		361	}
		362	else
		363	{
		364	// broadcast, this is ugly, but due to the security policy
		365	// we have to connect to all hosts...
		366	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		367	if ((*c)->conf != THISNODE)
		368	(*c)->inject_data_packet (pkt, true);
		369	}
169	}	370	}
170		371
171	void	372	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	373	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	374	{
…		…
180	if (src == 0 \|\| src > conns.size ()	381	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	382	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	383	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	384	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	385	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		386	else if (dst > conns.size ())
		387	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		388	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	389	else
186	{	390	{
187	connection *c = conns[src - 1];	391	connection *c = conns[src - 1];
188		392
189	if (dst == 0 && !THISNODE->routerprio)	393	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	394	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	395	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	396	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	397	{
		398	if (THISNODE->routerprio)
		399	// the tos setting gets lost here. who cares.
		400	conns[dst - 1]->inject_vpn_packet (pkt);
		401	else
194	slog (L_WARN,	402	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	403	_("%s(%s): forwarding request (=> %s), but we are no router"),
		404	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	405	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	406	}
198	THISNODE->id, THISNODE->nodename);
199	else	407	else
200	c->recv_vpn_packet (pkt, rsi);	408	c->recv_vpn_packet (pkt, rsi);
201	}	409	}
202	}	410	}
203		411
		412	bool
		413	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		414	{
		415	switch (si.prot)
		416	{
		417	case PROT_IPv4:
		418	return send_ipv4_packet (pkt, si, tos);
		419	case PROT_UDPv4:
		420	return send_udpv4_packet (pkt, si, tos);
		421	#if ENABLE_TCP
		422	case PROT_TCPv4:
		423	return send_tcpv4_packet (pkt, si, tos);
		424	#endif
		425	#if ENABLE_ICMP
		426	case PROT_ICMPv4:
		427	return send_icmpv4_packet (pkt, si, tos);
		428	#endif
		429	#if ENABLE_DNS
		430	case PROT_DNSv4:
		431	return send_dnsv4_packet (pkt, si, tos);
		432	#endif
		433
		434	default:
		435	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		436	}
		437
		438	return false;
		439	}
		440
204	void	441	void
205	vpn::udpv4_ev (short revents)	442	vpn::ipv4_ev (io_watcher &w, short revents)
206	{	443	{
207	if (revents & (POLLIN \| POLLERR))	444	if (revents & EVENT_READ)
208	{	445	{
209	vpn_packet *pkt = new vpn_packet;	446	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	447	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	448	socklen_t sa_len = sizeof (sa);
212	int len;	449	int len;
213		450
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	451	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		452
216	sockinfo si(sa);	453	sockinfo si(sa, PROT_IPv4);
217		454
218	if (len > 0)	455	if (len > 0)
219	{	456	{
220	pkt->len = len;	457	pkt->len = len;
		458
		459	// raw sockets deliver the ipv4 header, but don't expect it on sends
		460	pkt->skip_hdr (IP_OVERHEAD);
221		461
222	recv_vpn_packet (pkt, si);	462	recv_vpn_packet (pkt, si);
223	}	463	}
224	else	464	else
225	{	465	{
…		…
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	467	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	468	}
229		469
230	delete pkt;	470	delete pkt;
231	}	471	}
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	472	else
239	{	473	{
240	slog (L_ERR,	474	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	475	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	476	revents);
243	exit (1);	477	exit (EXIT_FAILURE);
244	}	478	}
245	}	479	}
246		480
		481	#if ENABLE_ICMP
247	void	482	void
248	vpn::ipv4_ev (short revents)	483	vpn::icmpv4_ev (io_watcher &w, short revents)
249	{	484	{
250	if (revents & (POLLIN \| POLLERR))	485	if (revents & EVENT_READ)
251	{	486	{
252	vpn_packet *pkt = new vpn_packet;	487	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	488	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	489	socklen_t sa_len = sizeof (sa);
255	int len;	490	int len;
256		491
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	492	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		493
259	sockinfo si(sa, PROT_IPv4);	494	sockinfo si(sa, PROT_ICMPv4);
260		495
261	if (len > 0)	496	if (len > 0)
262	{	497	{
263	pkt->len = len;	498	pkt->len = len;
264		499
		500	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		501
		502	if (hdr->type == ::conf.icmp_type
		503	&& hdr->code == 255)
		504	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	505	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	506	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	507	pkt->skip_hdr (ICMP_OVERHEAD);
268		508
269	recv_vpn_packet (pkt, si);	509	recv_vpn_packet (pkt, si);
		510	}
270	}	511	}
271	else	512	else
272	{	513	{
273	// probably ECONNRESET or somesuch	514	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	515	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	516	}
276		517
277	delete pkt;	518	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	}	519	}
285	else	520	else
286	{	521	{
287	slog (L_ERR,	522	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	523	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	524	revents);
290	exit (1);	525	exit (EXIT_FAILURE);
		526	}
		527	}
		528	#endif
		529
		530	void
		531	vpn::udpv4_ev (io_watcher &w, short revents)
		532	{
		533	if (revents & EVENT_READ)
291	}	534	{
292	}	535	vpn_packet *pkt = new vpn_packet;
		536	struct sockaddr_in sa;
		537	socklen_t sa_len = sizeof (sa);
		538	int len;
293		539
		540	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		541
		542	sockinfo si(sa, PROT_UDPv4);
		543
		544	if (len > 0)
		545	{
		546	pkt->len = len;
		547
		548	recv_vpn_packet (pkt, si);
		549	}
		550	else
		551	{
		552	// probably ECONNRESET or somesuch
		553	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		554	}
		555
		556	delete pkt;
		557	}
		558	else
		559	{
		560	slog (L_ERR,
		561	_("FATAL: unknown revents %08x in socket, terminating\n"),
		562	revents);
		563	exit (EXIT_FAILURE);
		564	}
		565	}
		566
294	void	567	void
295	vpn::tap_ev (short revents)	568	vpn::tap_ev (io_watcher &w, short revents)
296	{	569	{
297	if (revents & POLLIN)	570	if (revents & EVENT_READ)
298	{	571	{
299	/* process data */	572	/* process data */
300	tap_packet *pkt;	573	tap_packet *pkt;
301		574
302	pkt = tap->recv ();	575	pkt = tap->recv ();
303		576
		577	if (!pkt)
		578	return;
		579
		580	if (pkt->len > 14)
		581	{
304	int dst = mac2id (pkt->dst);	582	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	583	int src = mac2id (pkt->src);
306		584
307	if (src != THISNODE->id)	585	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	{	586	{
325	// unicast	587	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
326	if (dst != THISNODE->id)	588	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	589	}
		590
		591	if (dst == THISNODE->id)
		592	{
		593	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		594	exit (EXIT_FAILURE);
		595	}
		596
		597	if (dst > conns.size ())
		598	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	599	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);	600	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	}	601	}
342		602
343	delete pkt;	603	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	}	604	}
350	else	605	else
351	abort ();	606	abort ();
352	}	607	}
353		608
354	void	609	void
355	vpn::event_cb (tstamp &ts)	610	vpn::event_cb (time_watcher &w)
356	{	611	{
357	if (events)	612	if (events)
358	{	613	{
359	if (events & EVENT_SHUTDOWN)	614	if (events & EVENT_SHUTDOWN)
360	{	615	{
361	slog (L_INFO, _("preparing shutdown..."));	616	slog (L_INFO, _("preparing shutdown..."));
362		617
363	shutdown_all ();	618	shutdown_all ();
364
365	remove_pid (pidfilename);	619	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	620	slog (L_INFO, _("terminating"));
368		621	exit (EXIT_SUCCESS);
369	exit (0);
370	}	622	}
371		623
372	if (events & EVENT_RECONNECT)	624	if (events & EVENT_RECONNECT)
373	{	625	{
374	slog (L_INFO, _("forced reconnect"));	626	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	628	reconnect_all ();
377	}	629	}
378		630
379	events = 0;	631	events = 0;
380	}	632	}
381
382	ts = TSTAMP_CANCEL;
383	}	633	}
384		634
385	void	635	void
386	vpn::shutdown_all ()	636	vpn::shutdown_all ()
387	{	637	{
…		…
400	connection_init ();	650	connection_init ();
401		651
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	652	for (configuration::node_vector::iterator i = conf.nodes.begin ();
403	i != conf.nodes.end (); ++i)	653	i != conf.nodes.end (); ++i)
404	{	654	{
405	connection *conn = new connection (this);	655	connection conn = new connection (this, i);
406
407	conn->conf = *i;
408	conns.push_back (conn);	656	conns.push_back (conn);
409
410	conn->establish_connection ();	657	conn->establish_connection ();
411	}	658	}
412	}	659	}
413		660
414	connection *vpn::find_router ()	661	connection *vpn::find_router ()
415	{	662	{
416	u32 prio = 0;	663	u32 prio = 1;
417	connection *router = 0;	664	connection *router = 0;
418		665
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	666	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	667	{
421	connection c = i;	668	connection c = i;
422		669
423	if (c->conf->routerprio > prio	670	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	671	&& 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)	672	&& c->ictx && c->octx
		673	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	674	{
428	prio = c->conf->routerprio;	675	prio = c->conf->routerprio;
429	router = c;	676	router = c;
430	}	677	}
431	}	678	}
432		679
433	return router;	680	return router;
434	}	681	}
435		682
436	void vpn::connect_request (int id)	683	void vpn::send_connect_request (int id)
437	{	684	{
438	connection *c = find_router ();	685	connection *c = find_router ();
439		686
440	if (c)	687	if (c)
441	c->connect_request (id);	688	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	689	else
443	// // no router found, aggressively connect to all routers	690	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	691	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	692	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	693	(*i)->establish_connection ();
447	}	694	}
448		695
449	void	696	void
450	connection::dump_status ()	697	connection::dump_status ()
451	{	698	{
…		…
468		715
469	slog (L_NOTICE, _("END status dump"));	716	slog (L_NOTICE, _("END status dump"));
470	}	717	}
471		718
472	vpn::vpn (void)	719	vpn::vpn (void)
		720	: event (this, &vpn::event_cb)
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	721	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	722	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
		723	#if ENABLE_TCP
		724	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
		725	#endif
		726	#if ENABLE_ICMP
		727	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		728	#endif
		729	#if ENABLE_DNS
		730	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		731	#endif
475	, tap_ev_watcher(this, &vpn::tap_ev)	732	, tap_ev_watcher (this, &vpn::tap_ev)
476	, event(this, &vpn::event_cb)
477	{	733	{
478	}	734	}
479		735
480	vpn::~vpn ()	736	vpn::~vpn ()
481	{	737	{

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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 1.32 by pcg, Mon Mar 7 01:31:26 2005 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 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC