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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 21:02:25 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
43	#if ENABLE_TCP	47	vpn network; // THE vpn (bad design...)
44	# include <map>
45	# include <unistd.h>
46	# include <fcntl.h>
47	# include <sys/poll.h>
48	#endif
49		48
50	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
51		50
52	const char *vpn::script_if_up ()	51	const char *vpn::script_if_up ()
53	{	52	{
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		59
61	char *env;	60	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
75	putenv (env);	71	putenv (env);
76		72
…		…
78	}	74	}
79		75
80	int	76	int
81	vpn::setup ()	77	vpn::setup ()
82	{	78	{
		79	ipv4_fd = -1;
		80
		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	}
		110
83	udpv4_fd = -1;	111	udpv4_fd = -1;
84		112
85	if (THISNODE->protocols & PROT_UDPv4)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	114	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		116
89	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
90	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
91		121
92	// standard daemon practise...	122	// standard daemon practise...
93	{	123	{
94	int oval = 1;	124	int oval = 1;
95	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96	}	126	}
97		127
98	sockinfo si (THISNODE, PROT_UDPv4);	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
99
100	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
101	{
102	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
103	exit (1);
104	}
105
106	#ifdef IP_MTU_DISCOVER
107	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
108	// 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
109	// fragment for me sometimes.	131	// fragment for me sometimes.
110	{	132	{
111	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
112	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113	}	135	}
114	#endif	136	#endif
115		137
		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
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
117	}	147	}
118		148
119	ipv4_fd = -1;	149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
120	if (THISNODE->protocols & PROT_IPv4)	152	if (THISNODE->protocols & PROT_ICMPv4)
121	{	153	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123		155
124	if (ipv4_fd < 0)	156	if (icmpv4_fd < 0)
125	return -1;	157	return -1;
126		158
127	sockinfo si (THISNODE, PROT_IPv4);	159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
128		160
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	161	#ifdef ICMP_FILTER
130	{	162	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	163	icmp_filter oval;
132	exit (1);	164	oval.data = 0xffffffff;
		165	if (::conf.icmp_type < 32)
		166	oval.data &= ~(1 << ::conf.icmp_type);
		167
		168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133	}	169	}
		170	#endif
134		171
135	#ifdef IP_MTU_DISCOVER	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
137	// 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
138	// fragment for me sometimes.	175	// fragment for me sometimes.
139	{	176	{
140	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	179	}
143	#endif	180	#endif
144		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
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	191	}
		192	#endif
		193
		194	tcpv4_fd = -1;
147		195
148	#if ENABLE_TCP	196	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	198	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		200
153	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
154	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
155		205
156	// standard daemon practise...	206	// standard daemon practise...
157	{	207	{
158	int oval = 1;	208	int oval = 1;
159	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
162	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
163		213
164	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
165	{	215	{
166	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);	217	exit (EXIT_FAILURE);
168	}	218	}
169		219
170	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
171	{	221	{
172	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
173	exit (1);	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 ()))
174	}	261	{
		262	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		263	exit (EXIT_FAILURE);
		264	}
175		265
176	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	266	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
177	}	267	}
178	#endif	268	#endif
179		269
180	tap = new tap_device ();	270	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	271	if (!tap) //D this, of course, never catches
182	{	272	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	273	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	274	exit (EXIT_FAILURE);
185	}	275	}
186		276
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	277	run_script (run_script_cb (this, &vpn::script_if_up), true);
188		278
189	tap_ev_watcher.start (tap->fd, POLLIN);	279	tap_ev_watcher.start (tap->fd, EVENT_READ);
190		280
191	reconnect_all ();	281	reconnect_all ();
192		282
193	return 0;	283	return 0;
194	}	284	}
195		285
196	void	286	bool
197	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)
198	{	288	{
		289	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	290	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		291	#endif
200	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 ());
201	}
202		293
203	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
204	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)
205	{	344	{
		345	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	346	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		347	#endif
207	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	}
208	}	370	}
209		371
210	void	372	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	373	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	374	{
…		…
219	if (src == 0 \|\| src > conns.size ()	381	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	382	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	383	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	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)"),
223	(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 ());
224	else	389	else
225	{	390	{
226	connection *c = conns[src - 1];	391	connection *c = conns[src - 1];
227		392
228	if (dst == 0 && !THISNODE->routerprio)	393	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	394	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	395	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	396	else if (dst != THISNODE->id)
232	// 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
233	slog (L_WARN,	402	slog (L_WARN,
234	_("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,
235	dst, conns[dst - 1]->conf->nodename,	405	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	406	}
237	THISNODE->id, THISNODE->nodename);
238	else	407	else
239	c->recv_vpn_packet (pkt, rsi);	408	c->recv_vpn_packet (pkt, rsi);
240	}	409	}
241	}	410	}
242		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
243	void	441	void
244	vpn::udpv4_ev (io_watcher &w, short revents)	442	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	443	{
246	if (revents & (POLLIN \| POLLERR))	444	if (revents & EVENT_READ)
247	{	445	{
248	vpn_packet *pkt = new vpn_packet;	446	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	447	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	448	socklen_t sa_len = sizeof (sa);
251	int len;	449	int len;
252		450
253	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	451	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		452
255	sockinfo si(sa);	453	sockinfo si(sa, PROT_IPv4);
256		454
257	if (len > 0)	455	if (len > 0)
258	{	456	{
259	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);
260		461
261	recv_vpn_packet (pkt, si);	462	recv_vpn_packet (pkt, si);
262	}	463	}
263	else	464	else
264	{	465	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	467	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	468	}
268		469
269	delete pkt;	470	delete pkt;
270	}	471	}
271	else if (revents & POLLHUP)
272	{
273	// this cannot ;) happen on udp sockets
274	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
275	exit (1);
276	}
277	else	472	else
278	{	473	{
279	slog (L_ERR,	474	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	475	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	476	revents);
282	exit (1);	477	exit (EXIT_FAILURE);
283	}	478	}
284	}	479	}
285		480
		481	#if ENABLE_ICMP
286	void	482	void
287	vpn::ipv4_ev (io_watcher &w, short revents)	483	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	484	{
289	if (revents & (POLLIN \| POLLERR))	485	if (revents & EVENT_READ)
290	{	486	{
291	vpn_packet *pkt = new vpn_packet;	487	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	488	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	489	socklen_t sa_len = sizeof (sa);
294	int len;	490	int len;
295		491
296	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	492	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		493
298	sockinfo si(sa, PROT_IPv4);	494	sockinfo si(sa, PROT_ICMPv4);
299		495
300	if (len > 0)	496	if (len > 0)
301	{	497	{
302	pkt->len = len;	498	pkt->len = len;
303		499
		500	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		501
		502	if (hdr->type == ::conf.icmp_type
		503	&& hdr->code == 255)
		504	{
304	// 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
305	// this is slow, but...	506	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	507	pkt->skip_hdr (ICMP_OVERHEAD);
307		508
308	recv_vpn_packet (pkt, si);	509	recv_vpn_packet (pkt, si);
		510	}
309	}	511	}
310	else	512	else
311	{	513	{
312	// probably ECONNRESET or somesuch	514	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	515	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	516	}
315		517
316	delete pkt;	518	delete pkt;
317	}
318	else if (revents & POLLHUP)
319	{
320	// this cannot ;) happen on udp sockets
321	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
322	exit (1);
323	}	519	}
324	else	520	else
325	{	521	{
326	slog (L_ERR,	522	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	523	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	524	revents);
329	exit (1);	525	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_connection;
336
337	struct lt_sockinfo
338	{
339	bool operator()(const sockinfo a, const sockinfo b) const
340	{
341	return a < b;
342	}
343	};
344
345	struct tcp_si_map : public map<const sockinfo , tcp_connection , lt_sockinfo> {
346	void cleaner_cb (time_watcher &w); time_watcher cleaner;
347
348	tcp_si_map ()
349	: cleaner(this, &tcp_si_map::cleaner_cb)
350	{
351	cleaner.start (0);
352	}
353	} tcp_si;
354
355	struct tcp_connection : io_watcher {
356	tstamp last_activity;
357	const sockinfo si;
358	vpn &v;
359	bool ok;
360
361	void tcpv4_ev (io_watcher &w, short revents);
362
363	operator tcp_si_map::value_type()
364	{
365	return tcp_si_map::value_type (&si, this);
366	}
367
368	tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
369	: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev), ok(false)
370	{
371	last_activity = NOW;
372	start (fd_, POLLOUT);
373	}
374
375	~tcp_connection () { close (fd); }
376	};
377
378	void tcp_si_map::cleaner_cb (time_watcher &w)
379	{
380	w.at = NOW + 600;
381	tstamp to = NOW - ::conf.keepalive - 30;
382
383	for (iterator i = begin (); i != end(); )
384	if (i->second->last_activity >= to)
385	++i;
386	else
387	{
388	erase (i);
389	i = begin ();
390	}	526	}
391	}	527	}
392
393	void
394	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
395	{
396	tcp_si_map::iterator info = tcp_si.find (&si);
397
398	if (info == tcp_si.end ())
399	{
400	// woaw, the first lost packet ;)
401	int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
402
403	if (fd >= 0)
404	{
405	fcntl (fd, F_SETFL, O_NONBLOCK);
406
407	if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0
408	\|\| errno == EINPROGRESS)
409	{
410	tcp_connection i = new tcp_connection (fd, si, this);
411
412	tcp_si.insert (*i);
413	}
414	else
415	close (fd);
416	}
417	}
418	else
419	{
420	tcp_connection *i = info->second;
421
422	i->last_activity = NOW;
423
424	if (i->ok)
425	{
426	setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
427
428	// we use none of the advantages of tcp
429	write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32);
430	}
431	}
432
433	#if 0
434	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
435	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
436	#endif	528	#endif
437	}
438		529
439	void	530	void
440	tcp_connection::tcpv4_ev (io_watcher &w, short revents)
441	{
442	last_activity = NOW;
443
444	if (!ok) // just established?
445	{
446	ok = true;
447	fcntl (fd, F_SETFL, 0);
448	stop ();
449	start (fd, POLLIN);
450	}
451
452	if (revents & (POLLIN \| POLLERR))
453	{
454	u32 len;
455
456	if (sizeof (len) == read (fd, &len, sizeof (len)))
457	{
458	vpn_packet *pkt = new vpn_packet;
459
460	if (len == read (fd, &((*pkt)[0]), len))
461	{
462	pkt->len = len;
463
464	v.recv_vpn_packet (pkt, si);
465	return;
466	}
467
468	delete pkt;
469	}
470
471	tcp_si.erase (&si);
472	stop ();
473	}
474	}
475
476	void
477	vpn::tcpv4_ev (io_watcher &w, short revents)	531	vpn::udpv4_ev (io_watcher &w, short revents)
478	{	532	{
479	if (revents & (POLLIN \| POLLERR))	533	if (revents & EVENT_READ)
480	{	534	{
		535	vpn_packet *pkt = new vpn_packet;
481	struct sockaddr_in sa;	536	struct sockaddr_in sa;
482	socklen_t sa_len = sizeof (sa);	537	socklen_t sa_len = sizeof (sa);
483	int len;	538	int len;
484		539
485	int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);	540	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
486		541
487	if (fd >= 0)
488	{
489	fcntl (fd, F_SETFL, O_NONBLOCK);
490
491	sockinfo si(sa, PROT_TCPv4);	542	sockinfo si(sa, PROT_UDPv4);
492	tcp_connection i = new tcp_connection (fd, si, this);
493		543
494	slog (L_ERR, "accepted %d\n", fd);//D	544	if (len > 0)
495
496	tcp_si.insert (*i);
497	}	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
498	}	559	{
		560	slog (L_ERR,
		561	_("FATAL: unknown revents %08x in socket, terminating\n"),
		562	revents);
		563	exit (EXIT_FAILURE);
		564	}
499	}	565	}
500
501	#endif
502		566
503	void	567	void
504	vpn::tap_ev (io_watcher &w, short revents)	568	vpn::tap_ev (io_watcher &w, short revents)
505	{	569	{
506	if (revents & POLLIN)	570	if (revents & EVENT_READ)
507	{	571	{
508	/* process data */	572	/* process data */
509	tap_packet *pkt;	573	tap_packet *pkt;
510		574
511	pkt = tap->recv ();	575	pkt = tap->recv ();
512		576
		577	if (!pkt)
		578	return;
		579
		580	if (pkt->len > 14)
		581	{
513	int dst = mac2id (pkt->dst);	582	int dst = mac2id (pkt->dst);
514	int src = mac2id (pkt->src);	583	int src = mac2id (pkt->src);
515		584
516	if (src != THISNODE->id)	585	if (src != THISNODE->id)
517	{
518	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
519	exit (1);
520	}
521
522	if (dst == THISNODE->id)
523	{
524	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
525	exit (1);
526	}
527
528	if (dst > conns.size ())
529	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
530	else
531	{
532	if (dst)
533	{	586	{
534	// unicast	587	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
535	if (dst != THISNODE->id)	588	exit (EXIT_FAILURE);
536	conns[dst - 1]->inject_data_packet (pkt);
537	}	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);
538	else	599	else
539	{
540	// broadcast, first check router, then self, then english
541	connection *router = find_router ();
542
543	if (router)
544	router->inject_data_packet (pkt, true);	600	inject_data_packet (pkt, dst);
545	else
546	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
547	if ((*c)->conf != THISNODE)
548	(*c)->inject_data_packet (pkt);
549	}
550	}	601	}
551		602
552	delete pkt;	603	delete pkt;
553	}
554	else if (revents & (POLLHUP \| POLLERR))
555	{
556	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
557	exit (1);
558	}	604	}
559	else	605	else
560	abort ();	606	abort ();
561	}	607	}
562		608
…		…
568	if (events & EVENT_SHUTDOWN)	614	if (events & EVENT_SHUTDOWN)
569	{	615	{
570	slog (L_INFO, _("preparing shutdown..."));	616	slog (L_INFO, _("preparing shutdown..."));
571		617
572	shutdown_all ();	618	shutdown_all ();
573
574	remove_pid (pidfilename);	619	remove_pid (conf.pidfilename);
575
576	slog (L_INFO, _("terminating"));	620	slog (L_INFO, _("terminating"));
577		621	exit (EXIT_SUCCESS);
578	exit (0);
579	}	622	}
580		623
581	if (events & EVENT_RECONNECT)	624	if (events & EVENT_RECONNECT)
582	{	625	{
583	slog (L_INFO, _("forced reconnect"));	626	slog (L_INFO, _("forced reconnect"));
…		…
585	reconnect_all ();	628	reconnect_all ();
586	}	629	}
587		630
588	events = 0;	631	events = 0;
589	}	632	}
590
591	w.at = TSTAMP_CANCEL;
592	}	633	}
593		634
594	void	635	void
595	vpn::shutdown_all ()	636	vpn::shutdown_all ()
596	{	637	{
…		…
609	connection_init ();	650	connection_init ();
610		651
611	for (configuration::node_vector::iterator i = conf.nodes.begin ();	652	for (configuration::node_vector::iterator i = conf.nodes.begin ();
612	i != conf.nodes.end (); ++i)	653	i != conf.nodes.end (); ++i)
613	{	654	{
614	connection *conn = new connection (this);	655	connection conn = new connection (this, i);
615
616	conn->conf = *i;
617	conns.push_back (conn);	656	conns.push_back (conn);
618
619	conn->establish_connection ();	657	conn->establish_connection ();
620	}	658	}
621	}	659	}
622		660
623	connection *vpn::find_router ()	661	connection *vpn::find_router ()
624	{	662	{
625	u32 prio = 0;	663	u32 prio = 1;
626	connection *router = 0;	664	connection *router = 0;
627		665
628	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	666	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
629	{	667	{
630	connection c = i;	668	connection c = i;
631		669
632	if (c->conf->routerprio > prio	670	if (c->conf->routerprio > prio
633	&& c->connectmode == conf_node::C_ALWAYS	671	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
634	&& c->conf != THISNODE
635	&& c->ictx && c->octx)	672	&& c->ictx && c->octx
		673	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
636	{	674	{
637	prio = c->conf->routerprio;	675	prio = c->conf->routerprio;
638	router = c;	676	router = c;
639	}	677	}
640	}	678	}
641		679
642	return router;	680	return router;
643	}	681	}
644		682
645	void vpn::connect_request (int id)	683	void vpn::send_connect_request (int id)
646	{	684	{
647	connection *c = find_router ();	685	connection *c = find_router ();
648		686
649	if (c)	687	if (c)
650	c->connect_request (id);	688	c->send_connect_request (id);
651	//else // does not work, because all others must connect to the same router	689	else
652	// // no router found, aggressively connect to all routers	690	// no router found, aggressively connect to all routers
653	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	691	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
654	// if ((*i)->conf->routerprio)	692	if ((i)->conf->routerprio && (i)->conf != THISNODE)
655	// (*i)->establish_connection ();	693	(*i)->establish_connection ();
656	}	694	}
657		695
658	void	696	void
659	connection::dump_status ()	697	connection::dump_status ()
660	{	698	{
…		…
677		715
678	slog (L_NOTICE, _("END status dump"));	716	slog (L_NOTICE, _("END status dump"));
679	}	717	}
680		718
681	vpn::vpn (void)	719	vpn::vpn (void)
682	: event(this, &vpn::event_cb)	720	: event (this, &vpn::event_cb)
683	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	721	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
684	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	722	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
685	, tap_ev_watcher (this, &vpn::tap_ev)
686	#if ENABLE_TCP	723	#if ENABLE_TCP
687	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	724	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
688	#endif	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
		732	, tap_ev_watcher (this, &vpn::tap_ev)
689	{	733	{
690	}	734	}
691		735
692	vpn::~vpn ()	736	vpn::~vpn ()
693	{	737	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.3 by pcg, Wed Apr 2 21:02:25 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 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC