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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 05:15:00 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
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	void
		52	vpn::script_init_env ()
53	{	53	{
54	// the tunnel device mtu should be the physical mtu - overhead	54	// the tunnel device mtu should be the physical mtu - overhead
55	// the tricky part is rounding to the cipher key blocksize	55	// the tricky part is rounding to the cipher key blocksize
56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		60
61	char *env;	61	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	62	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	63	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);	64	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	65	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	66	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		67	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	68	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	69	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	70	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);	71	THISNODE->id & 0xff); putenv (env);
75	putenv (env);
76		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,
77	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;
78	}	94	}
79		95
80	int	96	int
81	vpn::setup ()	97	vpn::setup ()
82	{	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
83	udpv4_fd = -1;	131	udpv4_fd = -1;
84		132
85	if (THISNODE->protocols & PROT_UDPv4)	133	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	134	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	135	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		136
89	if (udpv4_fd < 0)	137	if (udpv4_fd < 0)
90	return -1;	138	return -1;
91		139
92	sockinfo si (THISNODE, PROT_UDPv4);	140	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
93		141
94	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	142	// standard daemon practise...
95	{	143	{
96	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	144	int oval = 1;
97	exit (1);	145	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98	}	146	}
99		147
100	#ifdef IP_MTU_DISCOVER	148	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101	// this I really consider a linux bug. I am neither connected	149	// this I really consider a linux bug. I am neither connected
102	// 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
103	// fragment for me sometimes.	151	// fragment for me sometimes.
104	{	152	{
105	int oval = IP_PMTUDISC_DONT;	153	int oval = IP_PMTUDISC_DONT;
106	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	154	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107	}	155	}
108	#endif	156	#endif
109		157
110	// standard daemon practise...	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
		166	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		167	}
		168
		169	icmpv4_fd = -1;
		170
		171	#if ENABLE_ICMP
		172	if (THISNODE->protocols & PROT_ICMPv4)
		173	{
		174	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		175
		176	if (icmpv4_fd < 0)
		177	return -1;
		178
		179	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		180
		181	#ifdef ICMP_FILTER
111	{	182	{
112	int oval = 1;	183	icmp_filter oval;
		184	oval.data = 0xffffffff;
		185	if (::conf.icmp_type < 32)
		186	oval.data &= ~(1 << ::conf.icmp_type);
		187
113	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	188	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114	}	189	}
		190	#endif
115		191
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	192	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
117	}
118
119	ipv4_fd = -1;
120	if (THISNODE->protocols & PROT_IPv4)
121	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
123
124	if (ipv4_fd < 0)
125	return -1;
126
127	sockinfo si (THISNODE, PROT_IPv4);
128
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
130	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
132	exit (1);
133	}
134
135	#ifdef IP_MTU_DISCOVER
136	// this I really consider a linux bug. I am neither connected	193	// this I really consider a linux bug. I am neither connected
137	// 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
138	// fragment for me sometimes.	195	// fragment for me sometimes.
139	{	196	{
140	int oval = IP_PMTUDISC_DONT;	197	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	198	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	199	}
143	#endif	200	#endif
144		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
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	210	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	211	}
		212	#endif
		213
		214	tcpv4_fd = -1;
147		215
148	#if ENABLE_TCP	216	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	217	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	218	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	219	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		220
153	if (tcpv4_fd < 0)	221	if (tcpv4_fd < 0)
154	return -1;	222	return -1;
155		223
156	sockinfo si (THISNODE, PROT_TCPv4);	224	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
157
158	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
159	{
160	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
161	exit (1);
162	}
163
164	if (listen (tcpv4_fd, 5))
165	{
166	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);
168	}
169		225
170	// standard daemon practise...	226	// standard daemon practise...
171	{	227	{
172	int oval = 1;	228	int oval = 1;
173	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	229	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174	}	230	}
175		231
		232	sockinfo si (THISNODE, PROT_TCPv4);
		233
		234	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		235	{
		236	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		237	exit (EXIT_FAILURE);
		238	}
		239
		240	if (listen (tcpv4_fd, 5))
		241	{
		242	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		243	exit (EXIT_FAILURE);
		244	}
		245
176	tcpv4_accept_watcher.start (tcpv4_fd, POLLIN);	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 ()))
		281	{
		282	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		283	exit (EXIT_FAILURE);
		284	}
		285
		286	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
177	}	287	}
178	#endif	288	#endif
179		289
180	tap = new tap_device ();	290	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	291	if (!tap) //D this, of course, never catches
182	{	292	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	293	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	294	exit (EXIT_FAILURE);
185	}	295	}
186		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
187	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	}
188		310
189	tap_ev_watcher.start (tap->fd, POLLIN);	311	tap_ev_watcher.start (tap->fd, EVENT_READ);
190		312
191	reconnect_all ();	313	reconnect_all ();
192		314
193	return 0;	315	return 0;
194	}	316	}
195		317
196	void	318	bool
197	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)
198	{	320	{
		321	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	322	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		323	#endif
200	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 ());
201	}
202		325
203	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
204	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)
205	{	376	{
		377	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	378	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		379	#endif
207	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	}
208	}	402	}
209		403
210	void	404	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	405	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	406	{
219	if (src == 0 \|\| src > conns.size ()	413	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	414	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	415	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	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)"),
223	(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 ());
224	else	421	else
225	{	422	{
226	connection *c = conns[src - 1];	423	connection *c = conns[src - 1];
227		424
228	if (dst == 0 && !THISNODE->routerprio)	425	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	426	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	427	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	428	else if (dst != THISNODE->id)
232	// 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
233	slog (L_WARN,	434	slog (L_WARN,
234	_("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,
235	dst, conns[dst - 1]->conf->nodename,	437	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	438	}
237	THISNODE->id, THISNODE->nodename);
238	else	439	else
239	c->recv_vpn_packet (pkt, rsi);	440	c->recv_vpn_packet (pkt, rsi);
240	}	441	}
241	}	442	}
242		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
243	void	473	void
244	vpn::udpv4_ev (int fd, short revents)	474	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	475	{
246	if (revents & (POLLIN \| POLLERR))	476	if (revents & EVENT_READ)
247	{	477	{
248	vpn_packet *pkt = new vpn_packet;	478	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	479	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	480	socklen_t sa_len = sizeof (sa);
251	int len;	481	int len;
252		482
253	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	483	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		484
255	sockinfo si(sa);	485	sockinfo si(sa, PROT_IPv4);
256		486
257	if (len > 0)	487	if (len > 0)
258	{	488	{
259	pkt->len = len;	489	pkt->len = len;
		490
		491	// raw sockets deliver the ipv4 header, but don't expect it on sends
		492	pkt->skip_hdr (IP_OVERHEAD);
260		493
261	recv_vpn_packet (pkt, si);	494	recv_vpn_packet (pkt, si);
262	}	495	}
263	else	496	else
264	{	497	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	499	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	500	}
268		501
269	delete pkt;	502	delete pkt;
270	}	503	}
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	504	else
278	{	505	{
279	slog (L_ERR,	506	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	507	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	508	revents);
282	exit (1);	509	exit (EXIT_FAILURE);
283	}	510	}
284	}	511	}
285		512
		513	#if ENABLE_ICMP
286	void	514	void
287	vpn::ipv4_ev (int fd, short revents)	515	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	516	{
289	if (revents & (POLLIN \| POLLERR))	517	if (revents & EVENT_READ)
290	{	518	{
291	vpn_packet *pkt = new vpn_packet;	519	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	520	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	521	socklen_t sa_len = sizeof (sa);
294	int len;	522	int len;
295		523
296	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	524	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		525
298	sockinfo si(sa, PROT_IPv4);	526	sockinfo si(sa, PROT_ICMPv4);
299		527
300	if (len > 0)	528	if (len > 0)
301	{	529	{
302	pkt->len = len;	530	pkt->len = len;
303		531
		532	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		533
		534	if (hdr->type == ::conf.icmp_type
		535	&& hdr->code == 255)
		536	{
304	// 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
305	// this is slow, but...	538	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	539	pkt->skip_hdr (ICMP_OVERHEAD);
307		540
308	recv_vpn_packet (pkt, si);	541	recv_vpn_packet (pkt, si);
		542	}
309	}	543	}
310	else	544	else
311	{	545	{
312	// probably ECONNRESET or somesuch	546	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	547	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	548	}
315		549
316	delete pkt;	550	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	}	551	}
324	else	552	else
325	{	553	{
326	slog (L_ERR,	554	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	555	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	556	revents);
329	exit (1);	557	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_info {
336	int fd;
337	bool ok;
338	io_watcher r;
339
340	tcp_info (vpn *v)
341	: r(v, &vpn::tcpv4_ev)
342	{	558	}
343	fd = -1;	559	}
		560	#endif
		561
		562	void
		563	vpn::udpv4_ev (io_watcher &w, short revents)
		564	{
		565	if (revents & EVENT_READ)
344	}	566	{
345		567	vpn_packet *pkt = new vpn_packet;
346	~tcp_info () { close (fd); }
347	};
348
349	typedef map<sockinfo, tcp_info *> tcp_si_map;
350	typedef map<int, tcp_info *> tcp_fd_map; // unneecssary if iom would be cooler
351	static tcp_si_map tcp_si;
352	static tcp_fd_map tcp_fd;
353
354	void
355	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
356	{
357	tcp_si_map::iterator info = tcp_si.find (si);
358
359	if (info == tcp_si.end ())
360	{
361	// woaw, the first lost packet ;)
362	tcp_info *i = new tcp_info (this);
363
364	i->ok = false;
365	i->fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
366
367	if (i->fd >= 0)
368	{
369	fcntl (i->fd, F_SETFL, O_NONBLOCK);
370
371	if (connect (i->fd, si.sav4 (), si.salenv4 ()) >= 0
372	\|\| errno == EINPROGRESS)
373	{
374	tcp_si.insert (tcp_si_map::value_type (si, i));
375	tcp_fd.insert (tcp_fd_map::value_type (i->fd, i));
376	return;
377	}
378
379	delete i;
380	}
381	}
382	else
383	{
384	tcp_info *i = info->second;
385
386	if (i->ok)
387	{
388	setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
389
390	if (write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32))
391	{
392	// error, close socket, forget it and retry immediately
393	tcp_si.erase (info);
394	tcp_fd.erase (i->fd);
395	delete i;
396
397	// tail recursion is... better than goto(?)
398	send_tcpv4_packet (pkt, si, tos);
399	}
400	}
401	}
402
403	#if 0
404	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
405	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
406	#endif
407	}
408
409	void
410	vpn::tcpv4_accept (int fd, short revents)
411	{
412	if (revents & (POLLIN \| POLLERR))
413	{
414	struct sockaddr_in sa;	568	struct sockaddr_in sa;
415	socklen_t sa_len = sizeof (sa);	569	socklen_t sa_len = sizeof (sa);
416	int len;	570	int len;
417		571
418	fd = accept (fd, (sockaddr *)&sa, &sa_len);	572	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
419		573
420	if (fd >= 0)
421	{
422	fcntl (fd, F_SETFL, O_NONBLOCK);
423
424	sockinfo si(sa, PROT_TCPv4);	574	sockinfo si(sa, PROT_UDPv4);
425	tcp_info *i = new tcp_info (this);
426		575
427	i->fd = fd;	576	if (len > 0)
428	i->ok = true;
429	i->r.start (fd, POLLIN);
430
431	tcp_si.insert (tcp_si_map::value_type (si, i));
432	tcp_fd.insert (tcp_fd_map::value_type (fd, i));
433	}	577	{
434	}	578	pkt->len = len;
435	}
436		579
437	void	580	recv_vpn_packet (pkt, si);
438	vpn::tcpv4_ev (int fd, short revents)
439	{
440	if (revents & (POLLIN \| POLLERR))
441	{
442	tcp_fd_map::iterator info = tcp_fd.find (fd);
443
444	if (info != tcp_fd.end ())
445	{	581	}
446	tcp_info *i = info->second;	582	else
447
448	if (!i->ok) // not yet established
449	{
450	i->ok = true;
451	fcntl (i->fd, F_SETFL, 0);
452	}
453
454	u32 len;
455
456	if (sizeof (len) == read (fd, &len, sizeof (len)))
457	{
458	slog (L_ERR, "%d bytes received\n", len);
459	}
460
461	//tcp_si.erase (i);
462	tcp_fd.erase (fd);
463	delete i;
464	}	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
465	}	591	{
		592	slog (L_ERR,
		593	_("FATAL: unknown revents %08x in socket, terminating\n"),
		594	revents);
		595	exit (EXIT_FAILURE);
		596	}
466	}	597	}
467		598
468	#endif
469
470	void	599	void
471	vpn::tap_ev (int fd, short revents)	600	vpn::tap_ev (io_watcher &w, short revents)
472	{	601	{
473	if (revents & POLLIN)	602	if (revents & EVENT_READ)
474	{	603	{
475	/* process data */	604	/* process data */
476	tap_packet *pkt;	605	tap_packet *pkt;
477		606
478	pkt = tap->recv ();	607	pkt = tap->recv ();
479		608
		609	if (!pkt)
		610	return;
		611
		612	if (pkt->len > 14)
		613	{
480	int dst = mac2id (pkt->dst);	614	int dst = mac2id (pkt->dst);
481	int src = mac2id (pkt->src);	615	int src = mac2id (pkt->src);
482		616
483	if (src != THISNODE->id)	617	if (src != THISNODE->id)
484	{
485	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
486	exit (1);
487	}
488
489	if (dst == THISNODE->id)
490	{
491	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
492	exit (1);
493	}
494
495	if (dst > conns.size ())
496	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
497	else
498	{
499	if (dst)
500	{	618	{
501	// unicast	619	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
502	if (dst != THISNODE->id)	620	exit (EXIT_FAILURE);
503	conns[dst - 1]->inject_data_packet (pkt);
504	}	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);
505	else	631	else
506	{
507	// broadcast, first check router, then self, then english
508	connection *router = find_router ();
509
510	if (router)
511	router->inject_data_packet (pkt, true);	632	inject_data_packet (pkt, dst);
512	else
513	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
514	if ((*c)->conf != THISNODE)
515	(*c)->inject_data_packet (pkt);
516	}
517	}	633	}
518		634
519	delete pkt;	635	delete pkt;
520	}
521	else if (revents & (POLLHUP \| POLLERR))
522	{
523	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
524	exit (1);
525	}	636	}
526	else	637	else
527	abort ();	638	abort ();
528	}	639	}
529		640
530	void	641	void
531	vpn::event_cb (tstamp &ts)	642	vpn::event_cb (time_watcher &w)
532	{	643	{
533	if (events)	644	if (events)
534	{	645	{
535	if (events & EVENT_SHUTDOWN)	646	if (events & EVENT_SHUTDOWN)
536	{	647	{
537	slog (L_INFO, _("preparing shutdown..."));	648	slog (L_INFO, _("preparing shutdown..."));
538		649
539	shutdown_all ();	650	shutdown_all ();
540
541	remove_pid (pidfilename);	651	remove_pid (conf.pidfilename);
542
543	slog (L_INFO, _("terminating"));	652	slog (L_INFO, _("terminating"));
544		653	exit (EXIT_SUCCESS);
545	exit (0);
546	}	654	}
547		655
548	if (events & EVENT_RECONNECT)	656	if (events & EVENT_RECONNECT)
549	{	657	{
550	slog (L_INFO, _("forced reconnect"));	658	slog (L_INFO, _("forced reconnect"));
…		…
552	reconnect_all ();	660	reconnect_all ();
553	}	661	}
554		662
555	events = 0;	663	events = 0;
556	}	664	}
557
558	ts = TSTAMP_CANCEL;
559	}	665	}
560		666
561	void	667	void
562	vpn::shutdown_all ()	668	vpn::shutdown_all ()
563	{	669	{
…		…
576	connection_init ();	682	connection_init ();
577		683
578	for (configuration::node_vector::iterator i = conf.nodes.begin ();	684	for (configuration::node_vector::iterator i = conf.nodes.begin ();
579	i != conf.nodes.end (); ++i)	685	i != conf.nodes.end (); ++i)
580	{	686	{
581	connection *conn = new connection (this);	687	connection conn = new connection (this, i);
582
583	conn->conf = *i;
584	conns.push_back (conn);	688	conns.push_back (conn);
585
586	conn->establish_connection ();	689	conn->establish_connection ();
587	}	690	}
588	}	691	}
589		692
590	connection *vpn::find_router ()	693	connection *vpn::find_router ()
591	{	694	{
592	u32 prio = 0;	695	u32 prio = 1;
593	connection *router = 0;	696	connection *router = 0;
594		697
595	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	698	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596	{	699	{
597	connection c = i;	700	connection c = i;
598		701
599	if (c->conf->routerprio > prio	702	if (c->conf->routerprio > prio
600	&& c->connectmode == conf_node::C_ALWAYS	703	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
601	&& c->conf != THISNODE
602	&& c->ictx && c->octx)	704	&& c->ictx && c->octx
		705	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603	{	706	{
604	prio = c->conf->routerprio;	707	prio = c->conf->routerprio;
605	router = c;	708	router = c;
606	}	709	}
607	}	710	}
608		711
609	return router;	712	return router;
610	}	713	}
611		714
612	void vpn::connect_request (int id)	715	void vpn::send_connect_request (int id)
613	{	716	{
614	connection *c = find_router ();	717	connection *c = find_router ();
615		718
616	if (c)	719	if (c)
617	c->connect_request (id);	720	c->send_connect_request (id);
618	//else // does not work, because all others must connect to the same router	721	else
619	// // no router found, aggressively connect to all routers	722	// no router found, aggressively connect to all routers
620	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	723	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621	// if ((*i)->conf->routerprio)	724	if ((i)->conf->routerprio && (i)->conf != THISNODE)
622	// (*i)->establish_connection ();	725	(*i)->establish_connection ();
623	}	726	}
624		727
625	void	728	void
626	connection::dump_status ()	729	connection::dump_status ()
627	{	730	{
…		…
644		747
645	slog (L_NOTICE, _("END status dump"));	748	slog (L_NOTICE, _("END status dump"));
646	}	749	}
647		750
648	vpn::vpn (void)	751	vpn::vpn (void)
649	: event(this, &vpn::event_cb)	752	: event (this, &vpn::event_cb)
650	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	753	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	754	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652	, tap_ev_watcher (this, &vpn::tap_ev)
653	#if ENABLE_TCP	755	#if ENABLE_TCP
654	, tcpv4_accept_watcher(this, &vpn::tcpv4_accept)	756	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655	#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)
656	{	765	{
657	}	766	}
658		767
659	vpn::~vpn ()	768	vpn::~vpn ()
660	{	769	{

Diff Legend

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Comparing gvpe/src/vpn.C (file contents): Revision 1.2 by pcg, Wed Apr 2 05:15:00 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 1.2 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.33 by pcg, Wed Mar 23 21:55:39 2005 UTC