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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 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 ()	51	void
		52	vpn::script_init_env ()
46	{	53	{
47	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		60
54	char *env;	61	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	63	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	64	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	65	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	66	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		67	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	68	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	71	THISNODE->id & 0xff); putenv (env);
68	putenv (env);
69		72
		73	// TODO: info for other nodes, maybe?
		74	}
		75
		76	const char *vpn::script_if_init ()
		77	{
		78	script_init_env ();
		79
		80	return tap->if_up ();
		81	}
		82
		83	const char *vpn::script_if_up ()
		84	{
		85	script_init_env ();
		86
		87	char *filename;
		88	asprintf (&filename,
		89	"%s/%s",
		90	confbase,
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	91	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		92
		93	return filename;
71	}	94	}
72		95
73	int	96	int
74	vpn::setup ()	97	vpn::setup ()
75	{	98	{
		99	ipv4_fd = -1;
		100
		101	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		102	{
		103	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		104
		105	if (ipv4_fd < 0)
		106	return -1;
		107
		108	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		109
		110	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		111	// this I really consider a linux bug. I am neither connected
		112	// nor do I fragment myself. Linux still sets DF and doesn't
		113	// fragment for me sometimes.
		114	{
		115	int oval = IP_PMTUDISC_DONT;
		116	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		117	}
		118	#endif
		119
		120	sockinfo si (THISNODE, PROT_IPv4);
		121
		122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		123	{
		124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		125	exit (EXIT_FAILURE);
		126	}
		127
		128	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		129	}
		130
76	udpv4_fd = -1;	131	udpv4_fd = -1;
77		132
78	if (THISNODE->protocols & PROT_UDPv4)	133	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	134	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	135	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		136
82	if (udpv4_fd < 0)	137	if (udpv4_fd < 0)
83	return -1;	138	return -1;
		139
		140	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
84		141
85	// standard daemon practise...	142	// standard daemon practise...
86	{	143	{
87	int oval = 1;	144	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	145	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	146	}
90		147
91	sockinfo si (THISNODE, PROT_UDPv4);	148	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92
93	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
94	{
95	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
96	exit (1);
97	}
98
99	#ifdef IP_MTU_DISCOVER
100	// this I really consider a linux bug. I am neither connected	149	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	150	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	151	// fragment for me sometimes.
103	{	152	{
104	int oval = IP_PMTUDISC_DONT;	153	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	154	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	155	}
107	#endif	156	#endif
108		157
		158	sockinfo si (THISNODE, PROT_UDPv4);
		159
		160	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		161	{
		162	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		163	exit (EXIT_FAILURE);
		164	}
		165
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	166	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
110	}	167	}
111		168
112	ipv4_fd = -1;	169	icmpv4_fd = -1;
		170
		171	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	172	if (THISNODE->protocols & PROT_ICMPv4)
114	{	173	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	174	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		175
117	if (ipv4_fd < 0)	176	if (icmpv4_fd < 0)
118	return -1;	177	return -1;
119		178
120	sockinfo si (THISNODE, PROT_IPv4);	179	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
121		180
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	181	#ifdef ICMP_FILTER
123	{	182	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	183	icmp_filter oval;
125	exit (1);	184	oval.data = 0xffffffff;
		185	if (::conf.icmp_type < 32)
		186	oval.data &= ~(1 << ::conf.icmp_type);
		187
		188	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	189	}
		190	#endif
127		191
128	#ifdef IP_MTU_DISCOVER	192	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	193	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	194	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	195	// fragment for me sometimes.
132	{	196	{
133	int oval = IP_PMTUDISC_DONT;	197	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	199	}
136	#endif	200	#endif
137		201
		202	sockinfo si (THISNODE, PROT_ICMPv4);
		203
		204	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		205	{
		206	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		207	exit (EXIT_FAILURE);
		208	}
		209
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	210	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
139	}	211	}
		212	#endif
		213
		214	tcpv4_fd = -1;
140		215
141	#if ENABLE_TCP	216	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	217	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	218	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	219	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		220
146	if (tcpv4_fd < 0)	221	if (tcpv4_fd < 0)
147	return -1;	222	return -1;
		223
		224	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
148		225
149	// standard daemon practise...	226	// standard daemon practise...
150	{	227	{
151	int oval = 1;	228	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	229	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
155	sockinfo si (THISNODE, PROT_TCPv4);	232	sockinfo si (THISNODE, PROT_TCPv4);
156		233
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	234	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	235	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	236	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160	exit (1);	237	exit (EXIT_FAILURE);
161	}	238	}
162		239
163	if (listen (tcpv4_fd, 5))	240	if (listen (tcpv4_fd, 5))
164	{	241	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	242	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166	exit (1);	243	exit (EXIT_FAILURE);
		244	}
		245
		246	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		247	}
		248	#endif
		249
		250	#if ENABLE_DNS
		251	if (THISNODE->protocols & PROT_DNSv4)
		252	{
		253	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		254
		255	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		256
		257	if (dnsv4_fd < 0)
		258	return -1;
		259
		260	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		261	// this I really consider a linux bug. I am neither connected
		262	// nor do I fragment myself. Linux still sets DF and doesn't
		263	// fragment for me sometimes.
		264	{
		265	int oval = IP_PMTUDISC_DONT;
		266	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		267	}
		268	#endif
		269
		270	// standard daemon practise...
		271	{
		272	int oval = 1;
		273	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		274	}
		275
		276	sockinfo si (THISNODE->dns_hostname,
		277	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		278	PROT_DNSv4);
		279
		280	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
167	}	281	{
		282	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		283	exit (EXIT_FAILURE);
		284	}
168		285
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	286	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
170	}	287	}
171	#endif	288	#endif
172		289
173	tap = new tap_device ();	290	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	291	if (!tap) //D this, of course, never catches
175	{	292	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	293	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	294	exit (EXIT_FAILURE);
178	}	295	}
179		296
		297	if (tap->if_up () &&
		298	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		299	{
		300	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		301	tap->if_up ());
		302	exit (EXIT_FAILURE);
		303	}
		304
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	305	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		306	{
		307	slog (L_ERR, _("if-up command execution failed, exiting."));
		308	exit (EXIT_FAILURE);
		309	}
181		310
182	tap_ev_watcher.start (tap->fd, POLLIN);	311	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		312
184	reconnect_all ();	313	reconnect_all ();
185		314
186	return 0;	315	return 0;
187	}	316	}
188		317
189	// send a vpn packet out to other hosts	318	bool
190	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);
197	break;
198
199	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);
201	break;
202
203	#if ENABLE_TCP
204	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);
206	break;
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();
212	}
213	}
214
215	void
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	319	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217	{	320	{
		321	#if defined(SOL_IP) && defined(IP_TOS)
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	322	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		323	#endif
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	324	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220	}
221		325
222	void	326	return true;
		327	}
		328
		329	static u16
		330	ipv4_checksum (u16 *data, unsigned int len)
		331	{
		332	// use 32 bit accumulator and fold back carry bits at the end
		333	u32 sum = 0;
		334
		335	while (len > 1)
		336	{
		337	sum += *data++;
		338	len -= 2;
		339	}
		340
		341	// odd byte left?
		342	if (len)
		343	sum += (u8 )data;
		344
		345	// add back carry bits
		346	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		347	sum += (sum >> 16); // carry
		348
		349	return ~sum;
		350	}
		351
		352	#if ENABLE_ICMP
		353	bool
		354	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		355	{
		356	#if defined(SOL_IP) && defined(IP_TOS)
		357	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		358	#endif
		359
		360	pkt->unshift_hdr (4);
		361
		362	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		363	hdr->type = ::conf.icmp_type;
		364	hdr->code = 255;
		365	hdr->checksum = 0;
		366	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		367
		368	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		369
		370	return true;
		371	}
		372	#endif
		373
		374	bool
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	375	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
224	{	376	{
		377	#if defined(SOL_IP) && defined(IP_TOS)
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	378	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		379	#endif
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	380	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		381
		382	return true;
		383	}
		384
		385	void
		386	vpn::inject_data_packet (tap_packet *pkt, int dst)
		387	{
		388	if (dst)
		389	{
		390	// unicast
		391	if (dst != THISNODE->id)
		392	conns[dst - 1]->inject_data_packet (pkt);
		393	}
		394	else
		395	{
		396	// broadcast, this is ugly, but due to the security policy
		397	// we have to connect to all hosts...
		398	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		399	if ((*c)->conf != THISNODE)
		400	(*c)->inject_data_packet (pkt, true);
		401	}
227	}	402	}
228		403
229	void	404	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	405	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	406	{
…		…
238	if (src == 0 \|\| src > conns.size ()	413	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	414	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	415	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	416	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	417	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		418	else if (dst > conns.size ())
		419	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		420	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	421	else
244	{	422	{
245	connection *c = conns[src - 1];	423	connection *c = conns[src - 1];
246		424
247	if (dst == 0 && !THISNODE->routerprio)	425	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	426	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
249	c->conf->nodename, (const char *)rsi);	427	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	428	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	429	{
		430	if (THISNODE->routerprio)
		431	// the tos setting gets lost here. who cares.
		432	conns[dst - 1]->inject_vpn_packet (pkt);
		433	else
252	slog (L_WARN,	434	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	435	_("%s(%s): forwarding request (=> %s), but we are no router"),
		436	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	437	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	438	}
256	THISNODE->id, THISNODE->nodename);
257	else	439	else
258	c->recv_vpn_packet (pkt, rsi);	440	c->recv_vpn_packet (pkt, rsi);
259	}	441	}
260	}	442	}
261		443
		444	bool
		445	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		446	{
		447	switch (si.prot)
		448	{
		449	case PROT_IPv4:
		450	return send_ipv4_packet (pkt, si, tos);
		451	case PROT_UDPv4:
		452	return send_udpv4_packet (pkt, si, tos);
		453	#if ENABLE_TCP
		454	case PROT_TCPv4:
		455	return send_tcpv4_packet (pkt, si, tos);
		456	#endif
		457	#if ENABLE_ICMP
		458	case PROT_ICMPv4:
		459	return send_icmpv4_packet (pkt, si, tos);
		460	#endif
		461	#if ENABLE_DNS
		462	case PROT_DNSv4:
		463	return send_dnsv4_packet (pkt, si, tos);
		464	#endif
		465
		466	default:
		467	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		468	}
		469
		470	return false;
		471	}
		472
262	void	473	void
263	vpn::udpv4_ev (io_watcher &w, short revents)	474	vpn::ipv4_ev (io_watcher &w, short revents)
264	{	475	{
265	if (revents & (POLLIN \| POLLERR))	476	if (revents & EVENT_READ)
266	{	477	{
267	vpn_packet *pkt = new vpn_packet;	478	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	479	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	480	socklen_t sa_len = sizeof (sa);
270	int len;	481	int len;
271		482
272	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	483	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
273		484
274	sockinfo si(sa, PROT_UDPv4);	485	sockinfo si(sa, PROT_IPv4);
275		486
276	if (len > 0)	487	if (len > 0)
277	{	488	{
278	pkt->len = len;	489	pkt->len = len;
279		490
		491	// raw sockets deliver the ipv4 header, but don't expect it on sends
		492	pkt->skip_hdr (IP_OVERHEAD);
		493
280	recv_vpn_packet (pkt, si);	494	recv_vpn_packet (pkt, si);
281	}	495	}
282	else	496	else
283	{	497	{
284	// probably ECONNRESET or somesuch	498	// probably ECONNRESET or somesuch
285	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	499	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
286	}	500	}
287		501
288	delete pkt;	502	delete pkt;
289	}	503	}
290	else if (revents & POLLHUP)
291	{
292	// this cannot ;) happen on udp sockets
293	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
294	exit (1);
295	}
296	else	504	else
297	{	505	{
298	slog (L_ERR,	506	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	507	_("FATAL: unknown revents %08x in socket, terminating\n"),
300	revents);	508	revents);
301	exit (1);	509	exit (EXIT_FAILURE);
302	}	510	}
303	}	511	}
304		512
		513	#if ENABLE_ICMP
305	void	514	void
306	vpn::ipv4_ev (io_watcher &w, short revents)	515	vpn::icmpv4_ev (io_watcher &w, short revents)
307	{	516	{
308	if (revents & (POLLIN \| POLLERR))	517	if (revents & EVENT_READ)
309	{	518	{
310	vpn_packet *pkt = new vpn_packet;	519	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	520	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	521	socklen_t sa_len = sizeof (sa);
313	int len;	522	int len;
314		523
315	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	524	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
316		525
317	sockinfo si(sa, PROT_IPv4);	526	sockinfo si(sa, PROT_ICMPv4);
318		527
319	if (len > 0)	528	if (len > 0)
320	{	529	{
321	pkt->len = len;	530	pkt->len = len;
322		531
		532	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		533
		534	if (hdr->type == ::conf.icmp_type
		535	&& hdr->code == 255)
		536	{
323	// raw sockets deliver the ipv4, but don't expect it on sends	537	// raw sockets deliver the ipv4, but don't expect it on sends
324	// this is slow, but...	538	// this is slow, but...
325	pkt->skip_hdr (IP_OVERHEAD);	539	pkt->skip_hdr (ICMP_OVERHEAD);
326		540
327	recv_vpn_packet (pkt, si);	541	recv_vpn_packet (pkt, si);
		542	}
328	}	543	}
329	else	544	else
330	{	545	{
331	// probably ECONNRESET or somesuch	546	// probably ECONNRESET or somesuch
332	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	547	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
333	}	548	}
334		549
335	delete pkt;	550	delete pkt;
336	}
337	else if (revents & POLLHUP)
338	{
339	// this cannot ;) happen on udp sockets
340	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
341	exit (1);
342	}	551	}
343	else	552	else
344	{	553	{
345	slog (L_ERR,	554	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	555	_("FATAL: unknown revents %08x in socket, terminating\n"),
347	revents);	556	revents);
348	exit (1);	557	exit (EXIT_FAILURE);
		558	}
		559	}
		560	#endif
		561
		562	void
		563	vpn::udpv4_ev (io_watcher &w, short revents)
		564	{
		565	if (revents & EVENT_READ)
		566	{
		567	vpn_packet *pkt = new vpn_packet;
		568	struct sockaddr_in sa;
		569	socklen_t sa_len = sizeof (sa);
		570	int len;
		571
		572	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		573
		574	sockinfo si(sa, PROT_UDPv4);
		575
		576	if (len > 0)
		577	{
		578	pkt->len = len;
		579
		580	recv_vpn_packet (pkt, si);
		581	}
		582	else
		583	{
		584	// probably ECONNRESET or somesuch
		585	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		586	}
		587
		588	delete pkt;
		589	}
		590	else
		591	{
		592	slog (L_ERR,
		593	_("FATAL: unknown revents %08x in socket, terminating\n"),
		594	revents);
		595	exit (EXIT_FAILURE);
349	}	596	}
350	}	597	}
351		598
352	void	599	void
353	vpn::tap_ev (io_watcher &w, short revents)	600	vpn::tap_ev (io_watcher &w, short revents)
354	{	601	{
355	if (revents & POLLIN)	602	if (revents & EVENT_READ)
356	{	603	{
357	/* process data */	604	/* process data */
358	tap_packet *pkt;	605	tap_packet *pkt;
359		606
360	pkt = tap->recv ();	607	pkt = tap->recv ();
361		608
		609	if (!pkt)
		610	return;
		611
		612	if (pkt->len > 14)
		613	{
362	int dst = mac2id (pkt->dst);	614	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	615	int src = mac2id (pkt->src);
364		616
365	if (src != THISNODE->id)	617	if (src != THISNODE->id)
366	{
367	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
368	exit (1);
369	}
370
371	if (dst == THISNODE->id)
372	{
373	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
374	exit (1);
375	}
376
377	if (dst > conns.size ())
378	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
379	else
380	{
381	if (dst)
382	{	618	{
383	// unicast	619	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	620	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	621	}
		622
		623	if (dst == THISNODE->id)
		624	{
		625	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		626	exit (EXIT_FAILURE);
		627	}
		628
		629	if (dst > conns.size ())
		630	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else	631	else
388	{
389	// broadcast, first check router, then self, then english
390	connection *router = find_router ();
391
392	if (router)
393	router->inject_data_packet (pkt, true);	632	inject_data_packet (pkt, dst);
394	else
395	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
396	if ((*c)->conf != THISNODE)
397	(*c)->inject_data_packet (pkt);
398	}
399	}	633	}
400		634
401	delete pkt;	635	delete pkt;
402	}
403	else if (revents & (POLLHUP \| POLLERR))
404	{
405	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
406	exit (1);
407	}	636	}
408	else	637	else
409	abort ();	638	abort ();
410	}	639	}
411		640
…		…
417	if (events & EVENT_SHUTDOWN)	646	if (events & EVENT_SHUTDOWN)
418	{	647	{
419	slog (L_INFO, _("preparing shutdown..."));	648	slog (L_INFO, _("preparing shutdown..."));
420		649
421	shutdown_all ();	650	shutdown_all ();
422
423	remove_pid (pidfilename);	651	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	652	slog (L_INFO, _("terminating"));
426		653	exit (EXIT_SUCCESS);
427	exit (0);
428	}	654	}
429		655
430	if (events & EVENT_RECONNECT)	656	if (events & EVENT_RECONNECT)
431	{	657	{
432	slog (L_INFO, _("forced reconnect"));	658	slog (L_INFO, _("forced reconnect"));
…		…
434	reconnect_all ();	660	reconnect_all ();
435	}	661	}
436		662
437	events = 0;	663	events = 0;
438	}	664	}
439
440	w.at = TSTAMP_CANCEL;
441	}	665	}
442		666
443	void	667	void
444	vpn::shutdown_all ()	668	vpn::shutdown_all ()
445	{	669	{
…		…
458	connection_init ();	682	connection_init ();
459		683
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	684	for (configuration::node_vector::iterator i = conf.nodes.begin ();
461	i != conf.nodes.end (); ++i)	685	i != conf.nodes.end (); ++i)
462	{	686	{
463	connection *conn = new connection (this);	687	connection conn = new connection (this, i);
464
465	conn->conf = *i;
466	conns.push_back (conn);	688	conns.push_back (conn);
467
468	conn->establish_connection ();	689	conn->establish_connection ();
469	}	690	}
470	}	691	}
471		692
472	connection *vpn::find_router ()	693	connection *vpn::find_router ()
473	{	694	{
474	u32 prio = 0;	695	u32 prio = 1;
475	connection *router = 0;	696	connection *router = 0;
476		697
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	698	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	699	{
479	connection c = i;	700	connection c = i;
480		701
481	if (c->conf->routerprio > prio	702	if (c->conf->routerprio > prio
482	&& c->connectmode == conf_node::C_ALWAYS	703	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
483	&& c->conf != THISNODE
484	&& c->ictx && c->octx)	704	&& c->ictx && c->octx
		705	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
485	{	706	{
486	prio = c->conf->routerprio;	707	prio = c->conf->routerprio;
487	router = c;	708	router = c;
488	}	709	}
489	}	710	}
490		711
491	return router;	712	return router;
492	}	713	}
493		714
494	void vpn::connect_request (int id)	715	void vpn::send_connect_request (int id)
495	{	716	{
496	connection *c = find_router ();	717	connection *c = find_router ();
497		718
498	if (c)	719	if (c)
499	c->connect_request (id);	720	c->send_connect_request (id);
500	//else // does not work, because all others must connect to the same router	721	else
501	// // no router found, aggressively connect to all routers	722	// no router found, aggressively connect to all routers
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	723	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
503	// if ((*i)->conf->routerprio)	724	if ((i)->conf->routerprio && (i)->conf != THISNODE)
504	// (*i)->establish_connection ();	725	(*i)->establish_connection ();
505	}	726	}
506		727
507	void	728	void
508	connection::dump_status ()	729	connection::dump_status ()
509	{	730	{
…		…
526		747
527	slog (L_NOTICE, _("END status dump"));	748	slog (L_NOTICE, _("END status dump"));
528	}	749	}
529		750
530	vpn::vpn (void)	751	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	752	: event (this, &vpn::event_cb)
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	753	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	754	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	755	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	756	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
537	#endif	757	#endif
		758	#if ENABLE_ICMP
		759	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		760	#endif
		761	#if ENABLE_DNS
		762	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		763	#endif
		764	, tap_ev_watcher (this, &vpn::tap_ev)
538	{	765	{
539	}	766	}
540		767
541	vpn::~vpn ()	768	vpn::~vpn ()
542	{	769	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs. Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC