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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	33	#include <errno.h>
34	#include <time.h>	34	#include <time.h>
35	#include <unistd.h>	35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <sys/socket.h>
		38
		39	#include "netcompat.h"
36		40
37	#include "pidfile.h"	41	#include "pidfile.h"
38		42
39	#include "connection.h"	43	#include "connection.h"
40	#include "util.h"	44	#include "util.h"
41	#include "vpn.h"	45	#include "vpn.h"
42		46
		47	vpn network; // THE vpn (bad design...)
		48
43	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
44		50
45	const char *vpn::script_if_up ()	51	static void inline
		52	set_tos (int fd, int &tos_prev, int tos)
		53	{
		54	#if defined(SOL_IP) && defined(IP_TOS)
		55	if (tos_prev == tos)
		56	return;
		57
		58	tos_prev = tos;
		59	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		60	#endif
		61	}
		62
		63	void
		64	vpn::script_init_env ()
46	{	65	{
47	// the tunnel device mtu should be the physical mtu - overhead	66	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	67	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		72
54	char *env;	73	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	74	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	75	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	76	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		77	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	78	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);	79	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	80	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);
68	putenv (env);
69		81
		82	conns [THISNODE->id - 1]->script_init_env ("");
		83
		84	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		85	{
		86	char ext[16];
		87	snprintf (ext, 16, "_%d", (*c)->conf->id);
		88	(*c)->script_init_env (ext);
		89	}
		90	}
		91
		92	const char *vpn::script_if_init ()
		93	{
		94	script_init_env ();
		95
		96	return tap->if_up ();
		97	}
		98
		99	const char *vpn::script_if_up ()
		100	{
		101	script_init_env ();
		102
		103	char *filename;
		104	asprintf (&filename,
		105	"%s/%s",
		106	confbase,
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	107	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		108
		109	return filename;
71	}	110	}
72		111
73	int	112	int
74	vpn::setup ()	113	vpn::setup ()
75	{	114	{
		115	ipv4_tos = -1;
		116	ipv4_fd = -1;
		117
		118	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		119	{
		120	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		121
		122	if (ipv4_fd < 0)
		123	return -1;
		124
		125	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		126	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		127
		128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		129	// this I really consider a linux bug. I am neither connected
		130	// nor do I fragment myself. Linux still sets DF and doesn't
		131	// fragment for me sometimes.
		132	{
		133	int oval = IP_PMTUDISC_DONT;
		134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		135	}
		136	#endif
		137
		138	sockinfo si (THISNODE, PROT_IPv4);
		139
		140	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
		146	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		147	}
		148
		149	udpv4_tos = -1;
76	udpv4_fd = -1;	150	udpv4_fd = -1;
77		151
78	if (THISNODE->protocols & PROT_UDPv4)	152	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	153	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	154	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		155
82	if (udpv4_fd < 0)	156	if (udpv4_fd < 0)
83	return -1;	157	return -1;
		158
		159	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		160	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
84		161
85	// standard daemon practise...	162	// standard daemon practise...
86	{	163	{
87	int oval = 1;	164	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	165	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	166	}
90		167
91	sockinfo si (THISNODE, PROT_UDPv4);	168	#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	169	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	170	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	171	// fragment for me sometimes.
103	{	172	{
104	int oval = IP_PMTUDISC_DONT;	173	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	174	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	175	}
107	#endif	176	#endif
108		177
		178	sockinfo si (THISNODE, PROT_UDPv4);
		179
		180	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		181	{
		182	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		183	exit (EXIT_FAILURE);
		184	}
		185
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	186	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
110	}	187	}
111		188
		189	icmpv4_tos = -1;
112	ipv4_fd = -1;	190	icmpv4_fd = -1;
		191
		192	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	193	if (THISNODE->protocols & PROT_ICMPv4)
114	{	194	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	195	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		196
117	if (ipv4_fd < 0)	197	if (icmpv4_fd < 0)
118	return -1;	198	return -1;
119		199
120	sockinfo si (THISNODE, PROT_IPv4);	200	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		201	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
121		202
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	203	#ifdef ICMP_FILTER
123	{	204	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	205	icmp_filter oval;
125	exit (1);	206	oval.data = 0xffffffff;
		207	if (::conf.icmp_type < 32)
		208	oval.data &= ~(1 << ::conf.icmp_type);
		209
		210	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	211	}
		212	#endif
127		213
128	#ifdef IP_MTU_DISCOVER	214	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	215	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	216	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	217	// fragment for me sometimes.
132	{	218	{
133	int oval = IP_PMTUDISC_DONT;	219	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	220	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	221	}
136	#endif	222	#endif
137		223
		224	sockinfo si (THISNODE, PROT_ICMPv4);
		225
		226	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		227	{
		228	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		229	exit (EXIT_FAILURE);
		230	}
		231
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	232	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
139	}	233	}
		234	#endif
		235
		236	tcpv4_fd = -1;
140		237
141	#if ENABLE_TCP	238	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	239	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	240	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	241	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		242
146	if (tcpv4_fd < 0)	243	if (tcpv4_fd < 0)
147	return -1;	244	return -1;
		245
		246	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		247	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
148		248
149	// standard daemon practise...	249	// standard daemon practise...
150	{	250	{
151	int oval = 1;	251	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	252	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
155	sockinfo si (THISNODE, PROT_TCPv4);	255	sockinfo si (THISNODE, PROT_TCPv4);
156		256
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	257	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	258	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	259	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160	exit (1);	260	exit (EXIT_FAILURE);
161	}	261	}
162		262
163	if (listen (tcpv4_fd, 5))	263	if (listen (tcpv4_fd, 5))
164	{	264	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	265	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166	exit (1);	266	exit (EXIT_FAILURE);
		267	}
		268
		269	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		270	}
		271	#endif
		272
		273	dnsv4_tos = -1;
		274	dnsv4_fd = -1;
		275
		276	#if ENABLE_DNS
		277	if (THISNODE->protocols & PROT_DNSv4)
		278	{
		279	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		280
		281	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		282
		283	if (dnsv4_fd < 0)
		284	return -1;
		285
		286	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		287	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		288
		289	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		290	// this I really consider a linux bug. I am neither connected
		291	// nor do I fragment myself. Linux still sets DF and doesn't
		292	// fragment for me sometimes.
		293	{
		294	int oval = IP_PMTUDISC_DONT;
		295	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
167	}	296	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#endif	297	# endif
		298
		299	// standard daemon practise...
		300	{
		301	int oval = 1;
		302	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		303	}
		304
		305	sockinfo si (THISNODE->dns_hostname,
		306	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		307	PROT_DNSv4);
		308
		309	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		310	{
		311	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		312	exit (EXIT_FAILURE);
		313	}
		314
		315	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		316	}
		317	#endif
		318
		319	/////////////////////////////////////////////////////////////////////////////
		320
		321	reconnect_all ();
		322
		323	/////////////////////////////////////////////////////////////////////////////
172		324
173	tap = new tap_device ();	325	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	326	if (!tap) //D this, of course, never catches
175	{	327	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	328	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	329	exit (EXIT_FAILURE);
178	}	330	}
179		331
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	332	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		333
		334	run_script_cb cb;
		335
		336	callback_set (cb, this, vpn, script_if_init);
		337	if (tap->if_up () &&
		338	!run_script (cb, true))
		339	{
		340	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		341	tap->if_up ());
		342	exit (EXIT_FAILURE);
		343	}
		344
		345	callback_set (cb, this, vpn, script_if_up);
		346	if (!run_script (cb, true))
		347	{
		348	slog (L_ERR, _("if-up command execution failed, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
182	tap_ev_watcher.start (tap->fd, POLLIN);	352	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		353
186	return 0;	354	return 0;
187	}
188
189	// send a vpn packet out to other hosts
190	bool
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192	{
193	switch (si.prot)
194	{
195	case PROT_IPv4:
196	return send_ipv4_packet (pkt, si, tos);
197
198	case PROT_UDPv4:
199	return send_udpv4_packet (pkt, si, tos);
200
201	#if ENABLE_TCP
202	case PROT_TCPv4:
203	return send_tcpv4_packet (pkt, si, tos);
204	#endif
205
206	default:
207	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
208	return false;
209	}
210	}	355	}
211		356
212	bool	357	bool
213	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	358	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
214	{	359	{
215	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	360	set_tos (ipv4_fd, ipv4_tos, tos);
216	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	361	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
217		362
218	return true;	363	return true;
219	}	364	}
		365
		366	static u16
		367	ipv4_checksum (u16 *data, unsigned int len)
		368	{
		369	// use 32 bit accumulator and fold back carry bits at the end
		370	u32 sum = 0;
		371
		372	while (len > 1)
		373	{
		374	sum += *data++;
		375	len -= 2;
		376	}
		377
		378	// odd byte left?
		379	if (len)
		380	sum += (u8 )data;
		381
		382	// add back carry bits
		383	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		384	sum += (sum >> 16); // carry
		385
		386	return ~sum;
		387	}
		388
		389	#if ENABLE_ICMP
		390	bool
		391	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		392	{
		393	pkt->unshift_hdr (4);
		394
		395	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		396	hdr->type = ::conf.icmp_type;
		397	hdr->code = 255;
		398	hdr->checksum = 0;
		399	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		400
		401	set_tos (icmpv4_fd, icmpv4_tos, tos);
		402	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		403
		404	return true;
		405	}
		406	#endif
220		407
221	bool	408	bool
222	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	409	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
223	{	410	{
224	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	411	set_tos (udpv4_fd, udpv4_tos, tos);
225	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	412	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
226		413
227	return true;	414	return true;
		415	}
		416
		417	void
		418	vpn::inject_data_packet (tap_packet *pkt, int dst)
		419	{
		420	if (dst)
		421	{
		422	// unicast
		423	if (dst != THISNODE->id)
		424	conns[dst - 1]->inject_data_packet (pkt);
		425	}
		426	else
		427	{
		428	// broadcast, this is ugly, but due to the security policy
		429	// we have to connect to all hosts...
		430	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		431	if ((*c)->conf != THISNODE)
		432	(*c)->inject_data_packet (pkt, true);
		433	}
228	}	434	}
229		435
230	void	436	void
231	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	437	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
232	{	438	{
…		…
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	452	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else	453	else
248	{	454	{
249	connection *c = conns[src - 1];	455	connection *c = conns[src - 1];
250		456
251	if (dst == 0 && !THISNODE->routerprio)	457	if (dst == 0)
252	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	458	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
253	c->conf->nodename, (const char *)rsi);	459	c->conf->nodename, (const char *)rsi);
254	else if (dst != 0 && dst != THISNODE->id)	460	else if (dst != THISNODE->id)
255	{	461	{
256	if (THISNODE->routerprio)	462	if (THISNODE->routerprio)
257	// the tos setting gets lost here. who cares.	463	// the tos setting gets lost here. who cares.
258	conns[dst - 1]->inject_vpn_packet (pkt);	464	conns[dst - 1]->inject_vpn_packet (pkt);
259	else	465	else
…		…
265	else	471	else
266	c->recv_vpn_packet (pkt, rsi);	472	c->recv_vpn_packet (pkt, rsi);
267	}	473	}
268	}	474	}
269		475
270	void	476	bool
271	vpn::udpv4_ev (io_watcher &w, short revents)	477	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
272	{	478	{
273	if (revents & (POLLIN \| POLLERR))	479	switch (si.prot)
		480	{
		481	case PROT_IPv4:
		482	return send_ipv4_packet (pkt, si, tos);
		483
		484	case PROT_UDPv4:
		485	return send_udpv4_packet (pkt, si, tos);
		486
		487	#if ENABLE_TCP
		488	case PROT_TCPv4:
		489	return send_tcpv4_packet (pkt, si, tos);
		490	#endif
		491	#if ENABLE_ICMP
		492	case PROT_ICMPv4:
		493	return send_icmpv4_packet (pkt, si, tos);
		494	#endif
		495	#if ENABLE_DNS
		496	case PROT_DNSv4:
		497	return send_dnsv4_packet (pkt, si, tos);
		498	#endif
		499	default:
		500	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		501	}
		502
		503	return false;
		504	}
		505
		506	void
		507	vpn::ipv4_ev (ev::io &w, int revents)
		508	{
		509	if (revents & EV_READ)
274	{	510	{
275	vpn_packet *pkt = new vpn_packet;	511	vpn_packet *pkt = new vpn_packet;
276	struct sockaddr_in sa;	512	struct sockaddr_in sa;
277	socklen_t sa_len = sizeof (sa);	513	socklen_t sa_len = sizeof (sa);
278	int len;	514	int len;
279		515
280	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	516	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
281		517
282	sockinfo si(sa, PROT_UDPv4);	518	sockinfo si(sa, PROT_IPv4);
283		519
284	if (len > 0)	520	if (len > 0)
285	{	521	{
286	pkt->len = len;	522	pkt->len = len;
287		523
		524	// raw sockets deliver the ipv4 header, but don't expect it on sends
		525	pkt->skip_hdr (IP_OVERHEAD);
		526
288	recv_vpn_packet (pkt, si);	527	recv_vpn_packet (pkt, si);
289	}	528	}
290	else	529	else
291	{	530	{
292	// probably ECONNRESET or somesuch	531	// probably ECONNRESET or somesuch
293	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	532	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
294	}	533	}
295		534
296	delete pkt;	535	delete pkt;
297	}	536	}
298	else if (revents & POLLHUP)
299	{
300	// this cannot ;) happen on udp sockets
301	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
302	exit (1);
303	}
304	else	537	else
305	{	538	{
306	slog (L_ERR,	539	slog (L_ERR,
307	_("FATAL: unknown revents %08x in socket, terminating\n"),	540	_("FATAL: unknown revents %08x in socket, terminating\n"),
308	revents);	541	revents);
309	exit (1);	542	exit (EXIT_FAILURE);
310	}	543	}
311	}	544	}
312		545
		546	#if ENABLE_ICMP
313	void	547	void
314	vpn::ipv4_ev (io_watcher &w, short revents)	548	vpn::icmpv4_ev (ev::io &w, int revents)
315	{	549	{
316	if (revents & (POLLIN \| POLLERR))	550	if (revents & EV_READ)
317	{	551	{
318	vpn_packet *pkt = new vpn_packet;	552	vpn_packet *pkt = new vpn_packet;
319	struct sockaddr_in sa;	553	struct sockaddr_in sa;
320	socklen_t sa_len = sizeof (sa);	554	socklen_t sa_len = sizeof (sa);
321	int len;	555	int len;
322		556
323	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	557	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
324		558
325	sockinfo si(sa, PROT_IPv4);	559	sockinfo si(sa, PROT_ICMPv4);
326		560
327	if (len > 0)	561	if (len > 0)
328	{	562	{
329	pkt->len = len;	563	pkt->len = len;
330		564
		565	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		566
		567	if (hdr->type == ::conf.icmp_type
		568	&& hdr->code == 255)
		569	{
331	// raw sockets deliver the ipv4, but don't expect it on sends	570	// raw sockets deliver the ipv4, but don't expect it on sends
332	// this is slow, but...	571	// this is slow, but...
333	pkt->skip_hdr (IP_OVERHEAD);	572	pkt->skip_hdr (ICMP_OVERHEAD);
334		573
335	recv_vpn_packet (pkt, si);	574	recv_vpn_packet (pkt, si);
		575	}
336	}	576	}
337	else	577	else
338	{	578	{
339	// probably ECONNRESET or somesuch	579	// probably ECONNRESET or somesuch
340	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	580	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
341	}	581	}
342		582
343	delete pkt;	583	delete pkt;
344	}
345	else if (revents & POLLHUP)
346	{
347	// this cannot ;) happen on udp sockets
348	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
349	exit (1);
350	}	584	}
351	else	585	else
352	{	586	{
353	slog (L_ERR,	587	slog (L_ERR,
354	_("FATAL: unknown revents %08x in socket, terminating\n"),	588	_("FATAL: unknown revents %08x in socket, terminating\n"),
355	revents);	589	revents);
356	exit (1);	590	exit (EXIT_FAILURE);
		591	}
		592	}
		593	#endif
		594
		595	void
		596	vpn::udpv4_ev (ev::io &w, int revents)
		597	{
		598	if (revents & EV_READ)
357	}	599	{
358	}	600	vpn_packet *pkt = new vpn_packet;
		601	struct sockaddr_in sa;
		602	socklen_t sa_len = sizeof (sa);
		603	int len;
359		604
		605	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		606
		607	sockinfo si(sa, PROT_UDPv4);
		608
		609	if (len > 0)
		610	{
		611	pkt->len = len;
		612
		613	recv_vpn_packet (pkt, si);
		614	}
		615	else
		616	{
		617	// probably ECONNRESET or somesuch
		618	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		619	}
		620
		621	delete pkt;
		622	}
		623	else
		624	{
		625	slog (L_ERR,
		626	_("FATAL: unknown revents %08x in socket, terminating\n"),
		627	revents);
		628	exit (EXIT_FAILURE);
		629	}
		630	}
		631
360	void	632	void
361	vpn::tap_ev (io_watcher &w, short revents)	633	vpn::tap_ev (ev::io &w, int revents)
362	{	634	{
363	if (revents & POLLIN)	635	if (revents & EV_READ)
364	{	636	{
365	/* process data */	637	/* process data */
366	tap_packet *pkt;	638	tap_packet *pkt;
367		639
368	pkt = tap->recv ();	640	pkt = tap->recv ();
369		641
		642	if (!pkt)
		643	return;
		644
		645	if (pkt->len > 14)
		646	{
370	int dst = mac2id (pkt->dst);	647	int dst = mac2id (pkt->dst);
371	int src = mac2id (pkt->src);	648	int src = mac2id (pkt->src);
372		649
373	if (src != THISNODE->id)	650	if (src != THISNODE->id)
374	{
375	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
376	exit (1);
377	}
378
379	if (dst == THISNODE->id)
380	{
381	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
382	exit (1);
383	}
384
385	if (dst > conns.size ())
386	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else
388	{
389	if (dst)
390	{	651	{
391	// unicast	652	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
392	if (dst != THISNODE->id)	653	exit (EXIT_FAILURE);
393	conns[dst - 1]->inject_data_packet (pkt);
394	}	654	}
		655
		656	if (dst == THISNODE->id)
		657	{
		658	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		659	exit (EXIT_FAILURE);
		660	}
		661
		662	if (dst > conns.size ())
		663	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
395	else	664	else
396	{
397	// broadcast, first check router, then self, then english
398	connection *router = find_router ();
399
400	if (router)
401	router->inject_data_packet (pkt, true);	665	inject_data_packet (pkt, dst);
402	else
403	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
404	if ((*c)->conf != THISNODE)
405	(*c)->inject_data_packet (pkt);
406	}
407	}	666	}
408		667
409	delete pkt;	668	delete pkt;
410	}
411	else if (revents & (POLLHUP \| POLLERR))
412	{
413	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
414	exit (1);
415	}	669	}
416	else	670	else
417	abort ();	671	abort ();
418	}	672	}
419		673
420	void	674	void
421	vpn::event_cb (time_watcher &w)	675	vpn::event_cb (ev::timer &w, int)
422	{	676	{
423	if (events)	677	if (events)
424	{	678	{
425	if (events & EVENT_SHUTDOWN)	679	if (events & EVENT_SHUTDOWN)
426	{	680	{
427	slog (L_INFO, _("preparing shutdown..."));	681	slog (L_INFO, _("preparing shutdown..."));
428		682
429	shutdown_all ();	683	shutdown_all ();
430
431	remove_pid (pidfilename);	684	remove_pid (conf.pidfilename);
432
433	slog (L_INFO, _("terminating"));	685	slog (L_INFO, _("terminating"));
434		686	exit (EXIT_SUCCESS);
435	exit (0);
436	}	687	}
437		688
438	if (events & EVENT_RECONNECT)	689	if (events & EVENT_RECONNECT)
439	{	690	{
440	slog (L_INFO, _("forced reconnect"));	691	slog (L_INFO, _("forced reconnect"));
…		…
442	reconnect_all ();	693	reconnect_all ();
443	}	694	}
444		695
445	events = 0;	696	events = 0;
446	}	697	}
447
448	w.at = TSTAMP_CANCEL;
449	}	698	}
450		699
451	void	700	void
452	vpn::shutdown_all ()	701	vpn::shutdown_all ()
453	{	702	{
…		…
466	connection_init ();	715	connection_init ();
467		716
468	for (configuration::node_vector::iterator i = conf.nodes.begin ();	717	for (configuration::node_vector::iterator i = conf.nodes.begin ();
469	i != conf.nodes.end (); ++i)	718	i != conf.nodes.end (); ++i)
470	{	719	{
471	connection *conn = new connection (this);	720	connection conn = new connection (this, i);
472
473	conn->conf = *i;
474	conns.push_back (conn);	721	conns.push_back (conn);
475
476	conn->establish_connection ();	722	conn->establish_connection ();
477	}	723	}
478	}	724	}
479		725
480	connection *vpn::find_router ()	726	connection *vpn::find_router ()
481	{	727	{
482	u32 prio = 0;	728	u32 prio = 1;
483	connection *router = 0;	729	connection *router = 0;
484		730
485	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
486	{	732	{
487	connection c = i;	733	connection c = i;
488		734
489	if (c->conf->routerprio > prio	735	if (c->conf->routerprio > prio
490	&& c->connectmode == conf_node::C_ALWAYS	736	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
491	&& c->conf != THISNODE
492	&& c->ictx && c->octx)	737	&& c->ictx && c->octx
		738	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
493	{	739	{
494	prio = c->conf->routerprio;	740	prio = c->conf->routerprio;
495	router = c;	741	router = c;
496	}	742	}
497	}	743	}
…		…
506	if (c)	752	if (c)
507	c->send_connect_request (id);	753	c->send_connect_request (id);
508	else	754	else
509	// no router found, aggressively connect to all routers	755	// no router found, aggressively connect to all routers
510	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	756	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
511	if ((*i)->conf->routerprio)	757	if ((i)->conf->routerprio && (i)->conf != THISNODE)
512	(*i)->establish_connection ();	758	(*i)->establish_connection ();
513	}	759	}
514		760
515	void	761	void
516	connection::dump_status ()	762	connection::dump_status ()
…		…
525	}	771	}
526		772
527	void	773	void
528	vpn::dump_status ()	774	vpn::dump_status ()
529	{	775	{
530	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	776	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
531		777
532	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	778	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
533	(*c)->dump_status ();	779	(*c)->dump_status ();
534		780
535	slog (L_NOTICE, _("END status dump"));	781	slog (L_NOTICE, _("END status dump"));
536	}	782	}
537		783
538	vpn::vpn (void)	784	vpn::vpn (void)
539	: event(this, &vpn::event_cb)	785	: event (this, &vpn::event_cb)
540	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	786	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
541	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	787	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
542	, tap_ev_watcher (this, &vpn::tap_ev)
543	#if ENABLE_TCP	788	#if ENABLE_TCP
544	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	789	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
545	#endif	790	#endif
		791	#if ENABLE_ICMP
		792	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		793	#endif
		794	#if ENABLE_DNS
		795	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		796	#endif
		797	, tap_ev_watcher (this, &vpn::tap_ev)
546	{	798	{
547	}	799	}
548		800
549	vpn::~vpn ()	801	vpn::~vpn ()
550	{	802	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs. Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC