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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 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 <errno.h>	33	#include <errno.h>
32	#include <time.h>	34	#include <time.h>
33	#include <unistd.h>	35	#include <unistd.h>
34	#include <arpa/inet.h>	36	#include <fcntl.h>
35	#include <netinet/in.h>	37	#include <sys/socket.h>
36	#include <netinet/ip_icmp.h>	38
		39	#include "netcompat.h"
37		40
38	#include "pidfile.h"	41	#include "pidfile.h"
39		42
40	#include "connection.h"	43	#include "connection.h"
41	#include "util.h"	44	#include "util.h"
42	#include "vpn.h"	45	#include "vpn.h"
43		46
		47	vpn network; // THE vpn (bad design...)
		48
44	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
45		50
46	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 ()
47	{	65	{
48	// the tunnel device mtu should be the physical mtu - overhead	66	// the tunnel device mtu should be the physical mtu - overhead
49	// the tricky part is rounding to the cipher key blocksize	67	// the tricky part is rounding to the cipher key blocksize
50	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
51	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
52	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
53	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
54		72
55	char *env;	73	char *env;
56	asprintf (&env, "CONFBASE=%s", confbase);	74	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
57	putenv (env);
58	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
59	putenv (env);
60	asprintf (&env, "NODEID=%d", THISNODE->id);
61	putenv (env);
62	asprintf (&env, "IFNAME=%s", tap->interface ());	75	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63	putenv (env);	76	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		77	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
64	asprintf (&env, "MTU=%d", mtu);	78	asprintf (&env, "MTU=%d", mtu); putenv (env);
65	putenv (env);	79	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	80	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
68	THISNODE->id & 0xff);
69	putenv (env);
70		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,
71	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;
72	}	110	}
73		111
74	int	112	int
75	vpn::setup ()	113	vpn::setup ()
76	{	114	{
		115	ipv4_tos = -1;
77	ipv4_fd = -1;	116	ipv4_fd = -1;
78		117
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	118	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	119	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	120	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		121
83	if (ipv4_fd < 0)	122	if (ipv4_fd < 0)
84	return -1;	123	return -1;
85		124
86	#ifdef IP_MTU_DISCOVER	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)
87	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
88	// 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
89	// fragment for me sometimes.	131	// fragment for me sometimes.
90	{	132	{
91	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
96	sockinfo si (THISNODE, PROT_IPv4);	138	sockinfo si (THISNODE, PROT_IPv4);
97		139
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	140	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	141	{
100	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	142	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
101	exit (1);	143	exit (EXIT_FAILURE);
102	}	144	}
103		145
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	146	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
105	}	147	}
106		148
		149	udpv4_tos = -1;
107	udpv4_fd = -1;	150	udpv4_fd = -1;
108		151
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	152	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	153	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	154	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		155
113	if (udpv4_fd < 0)	156	if (udpv4_fd < 0)
114	return -1;	157	return -1;
		158
		159	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		160	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
115		161
116	// standard daemon practise...	162	// standard daemon practise...
117	{	163	{
118	int oval = 1;	164	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	165	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	166	}
121		167
122	#ifdef IP_MTU_DISCOVER	168	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	169	// this I really consider a linux bug. I am neither connected
124	// 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
125	// fragment for me sometimes.	171	// fragment for me sometimes.
126	{	172	{
127	int oval = IP_PMTUDISC_DONT;	173	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	178	sockinfo si (THISNODE, PROT_UDPv4);
133		179
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	180	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	181	{
136	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	182	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
137	exit (1);	183	exit (EXIT_FAILURE);
138	}	184	}
139		185
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	186	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
141	}	187	}
142		188
		189	icmpv4_tos = -1;
143	icmpv4_fd = -1;	190	icmpv4_fd = -1;
144		191
145	#if ENABLE_ICMP	192	#if ENABLE_ICMP
146	if (THISNODE->protocols & PROT_ICMPv4)	193	if (THISNODE->protocols & PROT_ICMPv4)
147	{	194	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	195	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		196
150	if (icmpv4_fd < 0)	197	if (icmpv4_fd < 0)
151	return -1;	198	return -1;
		199
		200	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		201	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
152		202
153	#ifdef ICMP_FILTER	203	#ifdef ICMP_FILTER
154	{	204	{
155	icmp_filter oval;	205	icmp_filter oval;
156	oval.data = 0xffffffff;	206	oval.data = 0xffffffff;
…		…
159		209
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	210	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	211	}
162	#endif	212	#endif
163		213
164	#ifdef IP_MTU_DISCOVER	214	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	215	// this I really consider a linux bug. I am neither connected
166	// 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
167	// fragment for me sometimes.	217	// fragment for me sometimes.
168	{	218	{
169	int oval = IP_PMTUDISC_DONT;	219	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	220	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	221	}
172	#endif	222	#endif
173		223
174	sockinfo si (THISNODE, PROT_ICMPv4);	224	sockinfo si (THISNODE, PROT_ICMPv4);
175		225
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	226	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	227	{
178	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	228	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
179	exit (1);	229	exit (EXIT_FAILURE);
180	}	230	}
181		231
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	232	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
183	}	233	}
184	#endif	234	#endif
185		235
186	tcpv4_fd = -1;	236	tcpv4_fd = -1;
187		237
…		…
190	{	240	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	241	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		242
193	if (tcpv4_fd < 0)	243	if (tcpv4_fd < 0)
194	return -1;	244	return -1;
		245
		246	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		247	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
195		248
196	// standard daemon practise...	249	// standard daemon practise...
197	{	250	{
198	int oval = 1;	251	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	252	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	255	sockinfo si (THISNODE, PROT_TCPv4);
203		256
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	257	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	258	{
206	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));
207	exit (1);	260	exit (EXIT_FAILURE);
208	}	261	}
209		262
210	if (listen (tcpv4_fd, 5))	263	if (listen (tcpv4_fd, 5))
211	{	264	{
212	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));
213	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);
214	}	296	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#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	/////////////////////////////////////////////////////////////////////////////
219		324
220	tap = new tap_device ();	325	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	326	if (!tap) //D this, of course, never catches
222	{	327	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	328	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	329	exit (EXIT_FAILURE);
225	}	330	}
226		331
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	332	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
228		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
229	tap_ev_watcher.start (tap->fd, POLLIN);	352	tap_ev_watcher.start (tap->fd, EV_READ);
230
231	reconnect_all ();
232		353
233	return 0;	354	return 0;
234	}
235
236	// send a vpn packet out to other hosts
237	bool
238	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
239	{
240	switch (si.prot)
241	{
242	case PROT_IPv4:
243	return send_ipv4_packet (pkt, si, tos);
244
245	case PROT_UDPv4:
246	return send_udpv4_packet (pkt, si, tos);
247
248	#if ENABLE_TCP
249	case PROT_TCPv4:
250	return send_tcpv4_packet (pkt, si, tos);
251	#endif
252
253	#if ENABLE_ICMP
254	case PROT_ICMPv4:
255	return send_icmpv4_packet (pkt, si, tos);
256	#endif
257
258	default:
259	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
260	return false;
261	}
262	}	355	}
263		356
264	bool	357	bool
265	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)
266	{	359	{
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	360	set_tos (ipv4_fd, ipv4_tos, tos);
268	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 ());
269		362
270	return true;	363	return true;
271	}	364	}
272		365
…		…
291	sum += (sum >> 16); // carry	384	sum += (sum >> 16); // carry
292		385
293	return ~sum;	386	return ~sum;
294	}	387	}
295		388
		389	#if ENABLE_ICMP
296	bool	390	bool
297	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	391	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298	{	392	{
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
300
301	pkt->unshift_hdr (4);	393	pkt->unshift_hdr (4);
302		394
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	395	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	396	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	397	hdr->code = 255;
306	hdr->checksum = 0;	398	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	399	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		400
		401	set_tos (icmpv4_fd, icmpv4_tos, tos);
309	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	402	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310		403
311	return true;	404	return true;
312	}	405	}
		406	#endif
313		407
314	bool	408	bool
315	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)
316	{	410	{
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	411	set_tos (udpv4_fd, udpv4_tos, tos);
318	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 ());
319		413
320	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	}
321	}	434	}
322		435
323	void	436	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	437	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	438	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	452	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	453	else
341	{	454	{
342	connection *c = conns[src - 1];	455	connection *c = conns[src - 1];
343		456
344	if (dst == 0 && !THISNODE->routerprio)	457	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	458	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	459	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	460	else if (dst != THISNODE->id)
348	{	461	{
349	if (THISNODE->routerprio)	462	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	463	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	464	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	465	else
…		…
358	else	471	else
359	c->recv_vpn_packet (pkt, rsi);	472	c->recv_vpn_packet (pkt, rsi);
360	}	473	}
361	}	474	}
362		475
		476	bool
		477	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		478	{
		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
363	void	506	void
364	vpn::ipv4_ev (io_watcher &w, short revents)	507	vpn::ipv4_ev (ev::io &w, int revents)
365	{	508	{
366	if (revents & (POLLIN \| POLLERR))	509	if (revents & EV_READ)
367	{	510	{
368	vpn_packet *pkt = new vpn_packet;	511	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	512	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	513	socklen_t sa_len = sizeof (sa);
371	int len;	514	int len;
…		…
376		519
377	if (len > 0)	520	if (len > 0)
378	{	521	{
379	pkt->len = len;	522	pkt->len = len;
380		523
381	// raw sockets deliver the ipv4, but don't expect it on sends	524	// raw sockets deliver the ipv4 header, but don't expect it on sends
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	525	pkt->skip_hdr (IP_OVERHEAD);
384		526
385	recv_vpn_packet (pkt, si);	527	recv_vpn_packet (pkt, si);
386	}	528	}
387	else	529	else
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	532	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	533	}
392		534
393	delete pkt;	535	delete pkt;
394	}	536	}
395	else if (revents & POLLHUP)
396	{
397	// this cannot ;) happen on udp sockets
398	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
399	exit (1);
400	}
401	else	537	else
402	{	538	{
403	slog (L_ERR,	539	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	540	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	541	revents);
406	exit (1);	542	exit (EXIT_FAILURE);
407	}	543	}
408	}	544	}
409		545
		546	#if ENABLE_ICMP
410	void	547	void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	548	vpn::icmpv4_ev (ev::io &w, int revents)
412	{	549	{
413	if (revents & (POLLIN \| POLLERR))	550	if (revents & EV_READ)
414	{	551	{
415	vpn_packet *pkt = new vpn_packet;	552	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	553	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	554	socklen_t sa_len = sizeof (sa);
418	int len;	555	int len;
…		…
423		560
424	if (len > 0)	561	if (len > 0)
425	{	562	{
426	pkt->len = len;	563	pkt->len = len;
427		564
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	565	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		566
430	if (hdr->type == ::conf.icmp_type	567	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	568	&& hdr->code == 255)
432	{	569	{
433	// 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
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	580	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	581	}
445		582
446	delete pkt;	583	delete pkt;
447	}	584	}
448	else if (revents & POLLHUP)
449	{
450	// this cannot ;) happen on udp sockets
451	slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
452	exit (1);
453	}
454	else	585	else
455	{	586	{
456	slog (L_ERR,	587	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	588	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	589	revents);
459	exit (1);	590	exit (EXIT_FAILURE);
460	}	591	}
461	}	592	}
		593	#endif
462		594
463	void	595	void
464	vpn::udpv4_ev (io_watcher &w, short revents)	596	vpn::udpv4_ev (ev::io &w, int revents)
465	{	597	{
466	if (revents & (POLLIN \| POLLERR))	598	if (revents & EV_READ)
467	{	599	{
468	vpn_packet *pkt = new vpn_packet;	600	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	601	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	602	socklen_t sa_len = sizeof (sa);
471	int len;	603	int len;
…		…
486	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	618	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
487	}	619	}
488		620
489	delete pkt;	621	delete pkt;
490	}	622	}
491	else if (revents & POLLHUP)
492	{
493	// this cannot ;) happen on udp sockets
494	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
495	exit (1);
496	}
497	else	623	else
498	{	624	{
499	slog (L_ERR,	625	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	626	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	627	revents);
502	exit (1);	628	exit (EXIT_FAILURE);
503	}	629	}
504	}	630	}
505		631
506	void	632	void
507	vpn::tap_ev (io_watcher &w, short revents)	633	vpn::tap_ev (ev::io &w, int revents)
508	{	634	{
509	if (revents & POLLIN)	635	if (revents & EV_READ)
510	{	636	{
511	/* process data */	637	/* process data */
512	tap_packet *pkt;	638	tap_packet *pkt;
513		639
514	pkt = tap->recv ();	640	pkt = tap->recv ();
515		641
		642	if (!pkt)
		643	return;
		644
		645	if (pkt->len > 14)
		646	{
516	int dst = mac2id (pkt->dst);	647	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	648	int src = mac2id (pkt->src);
518		649
519	if (src != THISNODE->id)	650	if (src != THISNODE->id)
520	{
521	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
522	exit (1);
523	}
524
525	if (dst == THISNODE->id)
526	{
527	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
528	exit (1);
529	}
530
531	if (dst > conns.size ())
532	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
533	else
534	{
535	if (dst)
536	{	651	{
537	// unicast	652	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	653	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	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);
541	else	664	else
542	{
543	// broadcast, first check router, then self, then english
544	connection *router = find_router ();
545
546	if (router)
547	router->inject_data_packet (pkt, true);	665	inject_data_packet (pkt, dst);
548	else
549	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
550	if ((*c)->conf != THISNODE)
551	(*c)->inject_data_packet (pkt);
552	}
553	}	666	}
554		667
555	delete pkt;	668	delete pkt;
556	}
557	else if (revents & (POLLHUP \| POLLERR))
558	{
559	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
560	exit (1);
561	}	669	}
562	else	670	else
563	abort ();	671	abort ();
564	}	672	}
565		673
566	void	674	void
567	vpn::event_cb (time_watcher &w)	675	vpn::event_cb (ev::timer &w, int)
568	{	676	{
569	if (events)	677	if (events)
570	{	678	{
571	if (events & EVENT_SHUTDOWN)	679	if (events & EVENT_SHUTDOWN)
572	{	680	{
573	slog (L_INFO, _("preparing shutdown..."));	681	slog (L_INFO, _("preparing shutdown..."));
574		682
575	shutdown_all ();	683	shutdown_all ();
576
577	remove_pid (pidfilename);	684	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	685	slog (L_INFO, _("terminating"));
580		686	exit (EXIT_SUCCESS);
581	exit (0);
582	}	687	}
583		688
584	if (events & EVENT_RECONNECT)	689	if (events & EVENT_RECONNECT)
585	{	690	{
586	slog (L_INFO, _("forced reconnect"));	691	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	693	reconnect_all ();
589	}	694	}
590		695
591	events = 0;	696	events = 0;
592	}	697	}
593
594	w.at = TSTAMP_CANCEL;
595	}	698	}
596		699
597	void	700	void
598	vpn::shutdown_all ()	701	vpn::shutdown_all ()
599	{	702	{
…		…
612	connection_init ();	715	connection_init ();
613		716
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	717	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	718	i != conf.nodes.end (); ++i)
616	{	719	{
617	connection *conn = new connection (this);	720	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	721	conns.push_back (conn);
621
622	conn->establish_connection ();	722	conn->establish_connection ();
623	}	723	}
624	}	724	}
625		725
626	connection *vpn::find_router ()	726	connection *vpn::find_router ()
627	{	727	{
628	u32 prio = 0;	728	u32 prio = 1;
629	connection *router = 0;	729	connection *router = 0;
630		730
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	732	{
633	connection c = i;	733	connection c = i;
634		734
635	if (c->conf->routerprio > prio	735	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	736	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
637	&& c->conf != THISNODE
638	&& c->ictx && c->octx)	737	&& c->ictx && c->octx
		738	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	739	{
640	prio = c->conf->routerprio;	740	prio = c->conf->routerprio;
641	router = c;	741	router = c;
642	}	742	}
643	}	743	}
…		…
652	if (c)	752	if (c)
653	c->send_connect_request (id);	753	c->send_connect_request (id);
654	else	754	else
655	// no router found, aggressively connect to all routers	755	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	756	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	757	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	758	(*i)->establish_connection ();
659	}	759	}
660		760
661	void	761	void
662	connection::dump_status ()	762	connection::dump_status ()
…		…
671	}	771	}
672		772
673	void	773	void
674	vpn::dump_status ()	774	vpn::dump_status ()
675	{	775	{
676	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	776	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
677		777
678	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	778	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
679	(*c)->dump_status ();	779	(*c)->dump_status ();
680		780
681	slog (L_NOTICE, _("END status dump"));	781	slog (L_NOTICE, _("END status dump"));
…		…
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	789	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
690	#endif	790	#endif
691	#if ENABLE_ICMP	791	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	792	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693	#endif	793	#endif
		794	#if ENABLE_DNS
		795	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		796	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	797	, tap_ev_watcher (this, &vpn::tap_ev)
695	{	798	{
696	}	799	}
697		800
698	vpn::~vpn ()	801	vpn::~vpn ()

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Comparing gvpe/src/vpn.C (file contents): Revision 1.10 by pcg, Tue Apr 8 03:25:35 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 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC