[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 1.46 by pcg, Thu Aug 7 17:30:28 2008 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	inline const char *
		93	vpn::script_if_init ()
		94	{
		95	script_init_env ();
		96
		97	return tap->if_up ();
		98	}
		99
		100	inline const char *
		101	vpn::script_if_up ()
		102	{
		103	script_init_env ();
		104
		105	char *filename;
		106	asprintf (&filename,
		107	"%s/%s",
		108	confbase,
71	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	109	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		110
		111	return filename;
72	}	112	}
73		113
74	int	114	int
75	vpn::setup ()	115	vpn::setup ()
76	{	116	{
		117	ipv4_tos = -1;
77	ipv4_fd = -1;	118	ipv4_fd = -1;
78		119
79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	120	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80	{	121	{
81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82		123
83	if (ipv4_fd < 0)	124	if (ipv4_fd < 0)
84	return -1;	125	return -1;
85		126
86	#ifdef IP_MTU_DISCOVER	127	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		128	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		129
		130	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87	// this I really consider a linux bug. I am neither connected	131	// this I really consider a linux bug. I am neither connected
88	// nor do I fragment myself. Linux still sets DF and doesn't	132	// nor do I fragment myself. Linux still sets DF and doesn't
89	// fragment for me sometimes.	133	// fragment for me sometimes.
90	{	134	{
91	int oval = IP_PMTUDISC_DONT;	135	int oval = IP_PMTUDISC_DONT;
96	sockinfo si (THISNODE, PROT_IPv4);	140	sockinfo si (THISNODE, PROT_IPv4);
97		141
98	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	142	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99	{	143	{
100	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	144	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
101	exit (1);	145	exit (EXIT_FAILURE);
102	}	146	}
103		147
104	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	148	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
105	}	149	}
106		150
		151	udpv4_tos = -1;
107	udpv4_fd = -1;	152	udpv4_fd = -1;
108		153
109	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	154	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
110	{	155	{
111	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112		157
113	if (udpv4_fd < 0)	158	if (udpv4_fd < 0)
114	return -1;	159	return -1;
		160
		161	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		162	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
115		163
116	// standard daemon practise...	164	// standard daemon practise...
117	{	165	{
118	int oval = 1;	166	int oval = 1;
119	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	167	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120	}	168	}
121		169
122	#ifdef IP_MTU_DISCOVER	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
124	// nor do I fragment myself. Linux still sets DF and doesn't	172	// nor do I fragment myself. Linux still sets DF and doesn't
125	// fragment for me sometimes.	173	// fragment for me sometimes.
126	{	174	{
127	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
…		…
132	sockinfo si (THISNODE, PROT_UDPv4);	180	sockinfo si (THISNODE, PROT_UDPv4);
133		181
134	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	182	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135	{	183	{
136	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	184	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
137	exit (1);	185	exit (EXIT_FAILURE);
138	}	186	}
139		187
140	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	188	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
141	}	189	}
142		190
		191	icmpv4_tos = -1;
143	icmpv4_fd = -1;	192	icmpv4_fd = -1;
144		193
145	#if ENABLE_ICMP	194	#if ENABLE_ICMP
146	if (THISNODE->protocols & PROT_ICMPv4)	195	if (THISNODE->protocols & PROT_ICMPv4)
147	{	196	{
148	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);	197	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149		198
150	if (icmpv4_fd < 0)	199	if (icmpv4_fd < 0)
151	return -1;	200	return -1;
		201
		202	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		203	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
152		204
153	#ifdef ICMP_FILTER	205	#ifdef ICMP_FILTER
154	{	206	{
155	icmp_filter oval;	207	icmp_filter oval;
156	oval.data = 0xffffffff;	208	oval.data = 0xffffffff;
…		…
159		211
160	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);	212	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161	}	213	}
162	#endif	214	#endif
163		215
164	#ifdef IP_MTU_DISCOVER	216	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165	// this I really consider a linux bug. I am neither connected	217	// this I really consider a linux bug. I am neither connected
166	// nor do I fragment myself. Linux still sets DF and doesn't	218	// nor do I fragment myself. Linux still sets DF and doesn't
167	// fragment for me sometimes.	219	// fragment for me sometimes.
168	{	220	{
169	int oval = IP_PMTUDISC_DONT;	221	int oval = IP_PMTUDISC_DONT;
170	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171	}	223	}
172	#endif	224	#endif
173		225
174	sockinfo si (THISNODE, PROT_ICMPv4);	226	sockinfo si (THISNODE, PROT_ICMPv4);
175		227
176	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))	228	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177	{	229	{
178	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));	230	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
179	exit (1);	231	exit (EXIT_FAILURE);
180	}	232	}
181		233
182	icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);	234	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
183	}	235	}
184	#endif	236	#endif
185		237
186	tcpv4_fd = -1;	238	tcpv4_fd = -1;
187		239
…		…
190	{	242	{
191	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	243	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192		244
193	if (tcpv4_fd < 0)	245	if (tcpv4_fd < 0)
194	return -1;	246	return -1;
		247
		248	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		249	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
195		250
196	// standard daemon practise...	251	// standard daemon practise...
197	{	252	{
198	int oval = 1;	253	int oval = 1;
199	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	254	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
202	sockinfo si (THISNODE, PROT_TCPv4);	257	sockinfo si (THISNODE, PROT_TCPv4);
203		258
204	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
205	{	260	{
206	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	261	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
207	exit (1);	262	exit (EXIT_FAILURE);
208	}	263	}
209		264
210	if (listen (tcpv4_fd, 5))	265	if (listen (tcpv4_fd, 5))
211	{	266	{
212	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	267	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
213	exit (1);	268	exit (EXIT_FAILURE);
		269	}
		270
		271	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		272	}
		273	#endif
		274
		275	dnsv4_tos = -1;
		276	dnsv4_fd = -1;
		277
		278	#if ENABLE_DNS
		279	if (THISNODE->protocols & PROT_DNSv4)
		280	{
		281	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		282
		283	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		284
		285	if (dnsv4_fd < 0)
		286	return -1;
		287
		288	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		289	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		290
		291	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		292	// this I really consider a linux bug. I am neither connected
		293	// nor do I fragment myself. Linux still sets DF and doesn't
		294	// fragment for me sometimes.
		295	{
		296	int oval = IP_PMTUDISC_DONT;
		297	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
214	}	298	}
215
216	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
217	}
218	#endif	299	# endif
		300
		301	// standard daemon practise...
		302	{
		303	int oval = 1;
		304	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		305	}
		306
		307	sockinfo si (THISNODE->dns_hostname,
		308	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		309	PROT_DNSv4);
		310
		311	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		312	{
		313	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		314	exit (EXIT_FAILURE);
		315	}
		316
		317	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		318	}
		319	#endif
		320
		321	/////////////////////////////////////////////////////////////////////////////
		322
		323	reconnect_all ();
		324
		325	/////////////////////////////////////////////////////////////////////////////
219		326
220	tap = new tap_device ();	327	tap = new tap_device ();
221	if (!tap) //D this, of course, never catches	328	if (!tap) //D this, of course, never catches
222	{	329	{
223	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	330	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
224	exit (1);	331	exit (EXIT_FAILURE);
225	}	332	}
226		333
227	run_script (run_script_cb (this, &vpn::script_if_up), true);	334	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
228		335
		336	run_script_cb cb;
		337	cb.set<vpn, &vpn::script_if_init> (this);
		338
		339	if (tap->if_up () &&
		340	!run_script (cb, true))
		341	{
		342	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		343	tap->if_up ());
		344	exit (EXIT_FAILURE);
		345	}
		346
		347	cb.set<vpn, &vpn::script_if_up> (this);
		348	if (!run_script (cb, true))
		349	{
		350	slog (L_ERR, _("if-up command execution failed, exiting."));
		351	exit (EXIT_FAILURE);
		352	}
		353
229	tap_ev_watcher.start (tap->fd, POLLIN);	354	tap_ev_watcher.start (tap->fd, EV_READ);
230
231	reconnect_all ();
232		355
233	return 0;	356	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	}	357	}
263		358
264	bool	359	bool
265	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	360	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
266	{	361	{
267	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	362	set_tos (ipv4_fd, ipv4_tos, tos);
268	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	363	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
269		364
270	return true;	365	return true;
271	}	366	}
272		367
…		…
291	sum += (sum >> 16); // carry	386	sum += (sum >> 16); // carry
292		387
293	return ~sum;	388	return ~sum;
294	}	389	}
295		390
		391	#if ENABLE_ICMP
296	bool	392	bool
297	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	393	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298	{	394	{
299	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
300
301	pkt->unshift_hdr (4);	395	pkt->unshift_hdr (4);
302		396
303	icmphdr hdr = (icmphdr )&((*pkt)[0]);	397	icmp_header hdr = (icmp_header )&((*pkt)[0]);
304	hdr->type = ::conf.icmp_type;	398	hdr->type = ::conf.icmp_type;
305	hdr->code = 255;	399	hdr->code = 255;
306	hdr->checksum = 0;	400	hdr->checksum = 0;
307	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);	401	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308		402
		403	set_tos (icmpv4_fd, icmpv4_tos, tos);
309	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	404	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310		405
311	return true;	406	return true;
312	}	407	}
		408	#endif
313		409
314	bool	410	bool
315	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	411	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
316	{	412	{
317	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	413	set_tos (udpv4_fd, udpv4_tos, tos);
318	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	414	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
319		415
320	return true;	416	return true;
		417	}
		418
		419	void
		420	vpn::inject_data_packet (tap_packet *pkt, int dst)
		421	{
		422	if (dst)
		423	{
		424	// unicast
		425	if (dst != THISNODE->id)
		426	conns[dst - 1]->inject_data_packet (pkt);
		427	}
		428	else
		429	{
		430	// broadcast, this is ugly, but due to the security policy
		431	// we have to connect to all hosts...
		432	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		433	if ((*c)->conf != THISNODE)
		434	(*c)->inject_data_packet (pkt);
		435	}
321	}	436	}
322		437
323	void	438	void
324	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	439	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
325	{	440	{
…		…
339	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	454	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340	else	455	else
341	{	456	{
342	connection *c = conns[src - 1];	457	connection *c = conns[src - 1];
343		458
344	if (dst == 0 && !THISNODE->routerprio)	459	if (dst == 0)
345	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	460	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346	c->conf->nodename, (const char *)rsi);	461	c->conf->nodename, (const char *)rsi);
347	else if (dst != 0 && dst != THISNODE->id)	462	else if (dst != THISNODE->id)
348	{	463	{
349	if (THISNODE->routerprio)	464	if (THISNODE->routerprio)
350	// the tos setting gets lost here. who cares.	465	// the tos setting gets lost here. who cares.
351	conns[dst - 1]->inject_vpn_packet (pkt);	466	conns[dst - 1]->inject_vpn_packet (pkt);
352	else	467	else
…		…
358	else	473	else
359	c->recv_vpn_packet (pkt, rsi);	474	c->recv_vpn_packet (pkt, rsi);
360	}	475	}
361	}	476	}
362		477
363	void	478	bool
		479	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		480	{
		481	switch (si.prot)
		482	{
		483	case PROT_IPv4:
		484	return send_ipv4_packet (pkt, si, tos);
		485
		486	case PROT_UDPv4:
		487	return send_udpv4_packet (pkt, si, tos);
		488
		489	#if ENABLE_TCP
		490	case PROT_TCPv4:
		491	return send_tcpv4_packet (pkt, si, tos);
		492	#endif
		493	#if ENABLE_ICMP
		494	case PROT_ICMPv4:
		495	return send_icmpv4_packet (pkt, si, tos);
		496	#endif
		497	#if ENABLE_DNS
		498	case PROT_DNSv4:
		499	return send_dnsv4_packet (pkt, si, tos);
		500	#endif
		501	default:
		502	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		503	}
		504
		505	return false;
		506	}
		507
		508	inline void
364	vpn::ipv4_ev (io_watcher &w, short revents)	509	vpn::ipv4_ev (ev::io &w, int revents)
365	{	510	{
366	if (revents & (POLLIN \| POLLERR))	511	if (revents & EV_READ)
367	{	512	{
368	vpn_packet *pkt = new vpn_packet;	513	vpn_packet *pkt = new vpn_packet;
369	struct sockaddr_in sa;	514	struct sockaddr_in sa;
370	socklen_t sa_len = sizeof (sa);	515	socklen_t sa_len = sizeof (sa);
371	int len;	516	int len;
…		…
376		521
377	if (len > 0)	522	if (len > 0)
378	{	523	{
379	pkt->len = len;	524	pkt->len = len;
380		525
381	// raw sockets deliver the ipv4, but don't expect it on sends	526	// raw sockets deliver the ipv4 header, but don't expect it on sends
382	// this is slow, but...
383	pkt->skip_hdr (IP_OVERHEAD);	527	pkt->skip_hdr (IP_OVERHEAD);
384		528
385	recv_vpn_packet (pkt, si);	529	recv_vpn_packet (pkt, si);
386	}	530	}
387	else	531	else
…		…
390	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	534	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
391	}	535	}
392		536
393	delete pkt;	537	delete pkt;
394	}	538	}
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	539	else
402	{	540	{
403	slog (L_ERR,	541	slog (L_ERR,
404	_("FATAL: unknown revents %08x in socket, terminating\n"),	542	_("FATAL: unknown revents %08x in socket, terminating\n"),
405	revents);	543	revents);
406	exit (1);	544	exit (EXIT_FAILURE);
407	}	545	}
408	}	546	}
409		547
410	void	548	#if ENABLE_ICMP
		549	inline void
411	vpn::icmpv4_ev (io_watcher &w, short revents)	550	vpn::icmpv4_ev (ev::io &w, int revents)
412	{	551	{
413	if (revents & (POLLIN \| POLLERR))	552	if (revents & EV_READ)
414	{	553	{
415	vpn_packet *pkt = new vpn_packet;	554	vpn_packet *pkt = new vpn_packet;
416	struct sockaddr_in sa;	555	struct sockaddr_in sa;
417	socklen_t sa_len = sizeof (sa);	556	socklen_t sa_len = sizeof (sa);
418	int len;	557	int len;
…		…
423		562
424	if (len > 0)	563	if (len > 0)
425	{	564	{
426	pkt->len = len;	565	pkt->len = len;
427		566
428	icmphdr hdr = (icmphdr )&((*pkt)[IP_OVERHEAD]);	567	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
429		568
430	if (hdr->type == ::conf.icmp_type	569	if (hdr->type == ::conf.icmp_type
431	&& hdr->code == 255)	570	&& hdr->code == 255)
432	{	571	{
433	// raw sockets deliver the ipv4, but don't expect it on sends	572	// raw sockets deliver the ipv4, but don't expect it on sends
…		…
443	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	582	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
444	}	583	}
445		584
446	delete pkt;	585	delete pkt;
447	}	586	}
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	587	else
455	{	588	{
456	slog (L_ERR,	589	slog (L_ERR,
457	_("FATAL: unknown revents %08x in socket, terminating\n"),	590	_("FATAL: unknown revents %08x in socket, terminating\n"),
458	revents);	591	revents);
459	exit (1);	592	exit (EXIT_FAILURE);
460	}	593	}
461	}	594	}
		595	#endif
462		596
463	void	597	inline void
464	vpn::udpv4_ev (io_watcher &w, short revents)	598	vpn::udpv4_ev (ev::io &w, int revents)
465	{	599	{
466	if (revents & (POLLIN \| POLLERR))	600	if (revents & EV_READ)
467	{	601	{
468	vpn_packet *pkt = new vpn_packet;	602	vpn_packet *pkt = new vpn_packet;
469	struct sockaddr_in sa;	603	struct sockaddr_in sa;
470	socklen_t sa_len = sizeof (sa);	604	socklen_t sa_len = sizeof (sa);
471	int len;	605	int len;
…		…
486	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	620	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
487	}	621	}
488		622
489	delete pkt;	623	delete pkt;
490	}	624	}
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	625	else
498	{	626	{
499	slog (L_ERR,	627	slog (L_ERR,
500	_("FATAL: unknown revents %08x in socket, terminating\n"),	628	_("FATAL: unknown revents %08x in socket, terminating\n"),
501	revents);	629	revents);
502	exit (1);	630	exit (EXIT_FAILURE);
503	}	631	}
504	}	632	}
505		633
506	void	634	inline void
507	vpn::tap_ev (io_watcher &w, short revents)	635	vpn::tap_ev (ev::io &w, int revents)
508	{	636	{
509	if (revents & POLLIN)	637	if (revents & EV_READ)
510	{	638	{
511	/* process data */	639	/* process data */
512	tap_packet *pkt;	640	tap_packet *pkt;
513		641
514	pkt = tap->recv ();	642	pkt = tap->recv ();
515		643
		644	if (!pkt)
		645	return;
		646
		647	if (pkt->len > 14)
		648	{
516	int dst = mac2id (pkt->dst);	649	int dst = mac2id (pkt->dst);
517	int src = mac2id (pkt->src);	650	int src = mac2id (pkt->src);
518		651
519	if (src != THISNODE->id)	652	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	{	653	{
537	// unicast	654	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
538	if (dst != THISNODE->id)	655	exit (EXIT_FAILURE);
539	conns[dst - 1]->inject_data_packet (pkt);
540	}	656	}
		657
		658	if (dst == THISNODE->id)
		659	{
		660	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		661	exit (EXIT_FAILURE);
		662	}
		663
		664	if (dst > conns.size ())
		665	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
541	else	666	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);	667	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	}	668	}
554		669
555	delete pkt;	670	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	}	671	}
562	else	672	else
563	abort ();	673	abort ();
564	}	674	}
565		675
566	void	676	inline void
567	vpn::event_cb (time_watcher &w)	677	vpn::event_cb (ev::timer &w, int)
568	{	678	{
569	if (events)	679	if (events)
570	{	680	{
571	if (events & EVENT_SHUTDOWN)	681	if (events & EVENT_SHUTDOWN)
572	{	682	{
573	slog (L_INFO, _("preparing shutdown..."));	683	slog (L_INFO, _("preparing shutdown..."));
574		684
575	shutdown_all ();	685	shutdown_all ();
576
577	remove_pid (pidfilename);	686	remove_pid (conf.pidfilename);
578
579	slog (L_INFO, _("terminating"));	687	slog (L_INFO, _("terminating"));
580		688	exit (EXIT_SUCCESS);
581	exit (0);
582	}	689	}
583		690
584	if (events & EVENT_RECONNECT)	691	if (events & EVENT_RECONNECT)
585	{	692	{
586	slog (L_INFO, _("forced reconnect"));	693	slog (L_INFO, _("forced reconnect"));
…		…
588	reconnect_all ();	695	reconnect_all ();
589	}	696	}
590		697
591	events = 0;	698	events = 0;
592	}	699	}
593
594	w.at = TSTAMP_CANCEL;
595	}	700	}
596		701
597	void	702	void
598	vpn::shutdown_all ()	703	vpn::shutdown_all ()
599	{	704	{
…		…
612	connection_init ();	717	connection_init ();
613		718
614	for (configuration::node_vector::iterator i = conf.nodes.begin ();	719	for (configuration::node_vector::iterator i = conf.nodes.begin ();
615	i != conf.nodes.end (); ++i)	720	i != conf.nodes.end (); ++i)
616	{	721	{
617	connection *conn = new connection (this);	722	connection conn = new connection (this, i);
618
619	conn->conf = *i;
620	conns.push_back (conn);	723	conns.push_back (conn);
621
622	conn->establish_connection ();	724	conn->establish_connection ();
623	}	725	}
624	}	726	}
625		727
626	connection *vpn::find_router ()	728	connection *vpn::find_router ()
627	{	729	{
628	u32 prio = 0;	730	u32 prio = 1;
629	connection *router = 0;	731	connection *router = 0;
630		732
631	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	733	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632	{	734	{
633	connection c = i;	735	connection c = i;
634		736
635	if (c->conf->routerprio > prio	737	if (c->conf->routerprio > prio
636	&& c->connectmode == conf_node::C_ALWAYS	738	&& 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)	739	&& c->ictx && c->octx
		740	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639	{	741	{
640	prio = c->conf->routerprio;	742	prio = c->conf->routerprio;
641	router = c;	743	router = c;
642	}	744	}
643	}	745	}
…		…
652	if (c)	754	if (c)
653	c->send_connect_request (id);	755	c->send_connect_request (id);
654	else	756	else
655	// no router found, aggressively connect to all routers	757	// no router found, aggressively connect to all routers
656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	758	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657	if ((*i)->conf->routerprio)	759	if ((i)->conf->routerprio && (i)->conf != THISNODE)
658	(*i)->establish_connection ();	760	(*i)->establish_connection ();
659	}	761	}
660		762
661	void	763	void
662	connection::dump_status ()	764	connection::dump_status ()
…		…
671	}	773	}
672		774
673	void	775	void
674	vpn::dump_status ()	776	vpn::dump_status ()
675	{	777	{
676	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	778	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
677		779
678	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	780	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
679	(*c)->dump_status ();	781	(*c)->dump_status ();
680		782
681	slog (L_NOTICE, _("END status dump"));	783	slog (L_NOTICE, _("END status dump"));
682	}	784	}
683		785
684	vpn::vpn (void)	786	vpn::vpn (void)
		787	{
685	: event (this, &vpn::event_cb)	788	event .set<vpn, &vpn::event_cb > (this);
686	, udpv4_ev_watcher (this, &vpn::udpv4_ev)	789	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
687	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	790	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
688	#if ENABLE_TCP	791	#if ENABLE_TCP
689	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)	792	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
690	#endif	793	#endif
691	#if ENABLE_ICMP	794	#if ENABLE_ICMP
692	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)	795	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
693	#endif	796	#endif
694	, tap_ev_watcher (this, &vpn::tap_ev)	797	#if ENABLE_DNS
695	{	798	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		799	#endif
		800	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
696	}	801	}
697		802
698	vpn::~vpn ()	803	vpn::~vpn ()
699	{	804	{
700	}	805	}

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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 1.46 by pcg, Thu Aug 7 17:30:28 2008 UTC

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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 1.46 by pcg, Thu Aug 7 17:30:28 2008 UTC