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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 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 <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	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,
70	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;
71	}	112	}
72		113
73	int	114	int
74	vpn::setup ()	115	vpn::setup ()
75	{	116	{
		117	ipv4_tos = -1;
76	ipv4_fd = -1;	118	ipv4_fd = -1;
77		119
78	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)	120	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	121	{
80	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81		123
82	if (ipv4_fd < 0)	124	if (ipv4_fd < 0)
83	return -1;	125	return -1;
84		126
85	sockinfo si (THISNODE, PROT_IPv4);	127	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		128	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
86		129
87	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	130	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
88	{
89	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90	exit (1);
91	}
92
93	#ifdef IP_MTU_DISCOVER
94	// this I really consider a linux bug. I am neither connected	131	// this I really consider a linux bug. I am neither connected
95	// 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
96	// fragment for me sometimes.	133	// fragment for me sometimes.
97	{	134	{
98	int oval = IP_PMTUDISC_DONT;	135	int oval = IP_PMTUDISC_DONT;
99	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	136	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100	}	137	}
101	#endif	138	#endif
102		139
		140	sockinfo si (THISNODE, PROT_IPv4);
		141
		142	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		143	{
		144	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		145	exit (EXIT_FAILURE);
		146	}
		147
103	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	148	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
104	}	149	}
105		150
		151	udpv4_tos = -1;
106	udpv4_fd = -1;	152	udpv4_fd = -1;
107		153
108	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)	154	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
109	{	155	{
110	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111		157
112	if (udpv4_fd < 0)	158	if (udpv4_fd < 0)
113	return -1;	159	return -1;
		160
		161	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		162	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
114		163
115	// standard daemon practise...	164	// standard daemon practise...
116	{	165	{
117	int oval = 1;	166	int oval = 1;
118	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	167	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119	}	168	}
120		169
121	sockinfo si (THISNODE, PROT_UDPv4);	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
122
123	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
124	{
125	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
126	exit (1);
127	}
128
129	#ifdef IP_MTU_DISCOVER
130	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
131	// 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
132	// fragment for me sometimes.	173	// fragment for me sometimes.
133	{	174	{
134	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
135	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136	}	177	}
137	#endif	178	#endif
138		179
		180	sockinfo si (THISNODE, PROT_UDPv4);
		181
		182	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		183	{
		184	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		185	exit (EXIT_FAILURE);
		186	}
		187
139	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	188	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		189	}
		190
		191	icmpv4_tos = -1;
		192	icmpv4_fd = -1;
		193
		194	#if ENABLE_ICMP
		195	if (THISNODE->protocols & PROT_ICMPv4)
		196	{
		197	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		198
		199	if (icmpv4_fd < 0)
		200	return -1;
		201
		202	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		203	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		204
		205	#ifdef ICMP_FILTER
		206	{
		207	icmp_filter oval;
		208	oval.data = 0xffffffff;
		209	if (::conf.icmp_type < 32)
		210	oval.data &= ~(1 << ::conf.icmp_type);
		211
		212	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
140	}	213	}
		214	#endif
		215
		216	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		217	// this I really consider a linux bug. I am neither connected
		218	// nor do I fragment myself. Linux still sets DF and doesn't
		219	// fragment for me sometimes.
		220	{
		221	int oval = IP_PMTUDISC_DONT;
		222	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		223	}
		224	#endif
		225
		226	sockinfo si (THISNODE, PROT_ICMPv4);
		227
		228	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		229	{
		230	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		231	exit (EXIT_FAILURE);
		232	}
		233
		234	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		235	}
		236	#endif
141		237
142	tcpv4_fd = -1;	238	tcpv4_fd = -1;
143		239
144	#if ENABLE_TCP	240	#if ENABLE_TCP
145	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)	241	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146	{	242	{
147	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	243	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148		244
149	if (tcpv4_fd < 0)	245	if (tcpv4_fd < 0)
150	return -1;	246	return -1;
		247
		248	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		249	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
151		250
152	// standard daemon practise...	251	// standard daemon practise...
153	{	252	{
154	int oval = 1;	253	int oval = 1;
155	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	254	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
158	sockinfo si (THISNODE, PROT_TCPv4);	257	sockinfo si (THISNODE, PROT_TCPv4);
159		258
160	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161	{	260	{
162	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));
163	exit (1);	262	exit (EXIT_FAILURE);
164	}	263	}
165		264
166	if (listen (tcpv4_fd, 5))	265	if (listen (tcpv4_fd, 5))
167	{	266	{
168	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));
169	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);
170	}	298	}
171
172	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
173	}
174	#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	/////////////////////////////////////////////////////////////////////////////
175		326
176	tap = new tap_device ();	327	tap = new tap_device ();
177	if (!tap) //D this, of course, never catches	328	if (!tap) //D this, of course, never catches
178	{	329	{
179	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	330	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
180	exit (1);	331	exit (EXIT_FAILURE);
181	}	332	}
182		333
183	run_script (run_script_cb (this, &vpn::script_if_up), true);	334	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
184		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
185	tap_ev_watcher.start (tap->fd, POLLIN);	354	tap_ev_watcher.start (tap->fd, EV_READ);
186
187	reconnect_all ();
188		355
189	return 0;	356	return 0;
190	}
191
192	// send a vpn packet out to other hosts
193	bool
194	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
195	{
196	switch (si.prot)
197	{
198	case PROT_IPv4:
199	return send_ipv4_packet (pkt, si, tos);
200
201	case PROT_UDPv4:
202	return send_udpv4_packet (pkt, si, tos);
203
204	#if ENABLE_TCP
205	case PROT_TCPv4:
206	return send_tcpv4_packet (pkt, si, tos);
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	return false;
212	}
213	}	357	}
214		358
215	bool	359	bool
216	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)
217	{	361	{
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	362	set_tos (ipv4_fd, ipv4_tos, tos);
219	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 ());
220		364
221	return true;	365	return true;
222	}	366	}
		367
		368	static u16
		369	ipv4_checksum (u16 *data, unsigned int len)
		370	{
		371	// use 32 bit accumulator and fold back carry bits at the end
		372	u32 sum = 0;
		373
		374	while (len > 1)
		375	{
		376	sum += *data++;
		377	len -= 2;
		378	}
		379
		380	// odd byte left?
		381	if (len)
		382	sum += (u8 )data;
		383
		384	// add back carry bits
		385	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		386	sum += (sum >> 16); // carry
		387
		388	return ~sum;
		389	}
		390
		391	#if ENABLE_ICMP
		392	bool
		393	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		394	{
		395	pkt->unshift_hdr (4);
		396
		397	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		398	hdr->type = ::conf.icmp_type;
		399	hdr->code = 255;
		400	hdr->checksum = 0;
		401	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		402
		403	set_tos (icmpv4_fd, icmpv4_tos, tos);
		404	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		405
		406	return true;
		407	}
		408	#endif
223		409
224	bool	410	bool
225	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)
226	{	412	{
227	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	413	set_tos (udpv4_fd, udpv4_tos, tos);
228	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 ());
229		415
230	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	}
231	}	436	}
232		437
233	void	438	void
234	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	439	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
235	{	440	{
…		…
249	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	454	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
250	else	455	else
251	{	456	{
252	connection *c = conns[src - 1];	457	connection *c = conns[src - 1];
253		458
254	if (dst == 0 && !THISNODE->routerprio)	459	if (dst == 0)
255	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	460	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
256	c->conf->nodename, (const char *)rsi);	461	c->conf->nodename, (const char *)rsi);
257	else if (dst != 0 && dst != THISNODE->id)	462	else if (dst != THISNODE->id)
258	{	463	{
259	if (THISNODE->routerprio)	464	if (THISNODE->routerprio)
260	// the tos setting gets lost here. who cares.	465	// the tos setting gets lost here. who cares.
261	conns[dst - 1]->inject_vpn_packet (pkt);	466	conns[dst - 1]->inject_vpn_packet (pkt);
262	else	467	else
…		…
268	else	473	else
269	c->recv_vpn_packet (pkt, rsi);	474	c->recv_vpn_packet (pkt, rsi);
270	}	475	}
271	}	476	}
272		477
273	void	478	bool
274	vpn::udpv4_ev (io_watcher &w, short revents)	479	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
275	{	480	{
276	if (revents & (POLLIN \| POLLERR))	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
		509	vpn::ipv4_ev (ev::io &w, int revents)
		510	{
		511	if (revents & EV_READ)
277	{	512	{
278	vpn_packet *pkt = new vpn_packet;	513	vpn_packet *pkt = new vpn_packet;
279	struct sockaddr_in sa;	514	struct sockaddr_in sa;
280	socklen_t sa_len = sizeof (sa);	515	socklen_t sa_len = sizeof (sa);
281	int len;	516	int len;
282		517
283	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	518	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
284		519
285	sockinfo si(sa, PROT_UDPv4);	520	sockinfo si(sa, PROT_IPv4);
286		521
287	if (len > 0)	522	if (len > 0)
288	{	523	{
289	pkt->len = len;	524	pkt->len = len;
290		525
		526	// raw sockets deliver the ipv4 header, but don't expect it on sends
		527	pkt->skip_hdr (IP_OVERHEAD);
		528
291	recv_vpn_packet (pkt, si);	529	recv_vpn_packet (pkt, si);
292	}	530	}
293	else	531	else
294	{	532	{
295	// probably ECONNRESET or somesuch	533	// probably ECONNRESET or somesuch
296	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	534	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
297	}	535	}
298		536
299	delete pkt;	537	delete pkt;
300	}	538	}
301	else if (revents & POLLHUP)
302	{
303	// this cannot ;) happen on udp sockets
304	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
305	exit (1);
306	}
307	else	539	else
308	{	540	{
309	slog (L_ERR,	541	slog (L_ERR,
310	_("FATAL: unknown revents %08x in socket, terminating\n"),	542	_("FATAL: unknown revents %08x in socket, terminating\n"),
311	revents);	543	revents);
312	exit (1);	544	exit (EXIT_FAILURE);
313	}	545	}
314	}	546	}
315		547
316	void	548	#if ENABLE_ICMP
		549	inline void
317	vpn::ipv4_ev (io_watcher &w, short revents)	550	vpn::icmpv4_ev (ev::io &w, int revents)
318	{	551	{
319	if (revents & (POLLIN \| POLLERR))	552	if (revents & EV_READ)
320	{	553	{
321	vpn_packet *pkt = new vpn_packet;	554	vpn_packet *pkt = new vpn_packet;
322	struct sockaddr_in sa;	555	struct sockaddr_in sa;
323	socklen_t sa_len = sizeof (sa);	556	socklen_t sa_len = sizeof (sa);
324	int len;	557	int len;
325		558
326	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	559	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
327		560
328	sockinfo si(sa, PROT_IPv4);	561	sockinfo si(sa, PROT_ICMPv4);
329		562
330	if (len > 0)	563	if (len > 0)
331	{	564	{
332	pkt->len = len;	565	pkt->len = len;
333		566
		567	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		568
		569	if (hdr->type == ::conf.icmp_type
		570	&& hdr->code == 255)
		571	{
334	// 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
335	// this is slow, but...	573	// this is slow, but...
336	pkt->skip_hdr (IP_OVERHEAD);	574	pkt->skip_hdr (ICMP_OVERHEAD);
337		575
338	recv_vpn_packet (pkt, si);	576	recv_vpn_packet (pkt, si);
		577	}
339	}	578	}
340	else	579	else
341	{	580	{
342	// probably ECONNRESET or somesuch	581	// probably ECONNRESET or somesuch
343	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	582	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
344	}	583	}
345		584
346	delete pkt;	585	delete pkt;
347	}
348	else if (revents & POLLHUP)
349	{
350	// this cannot ;) happen on udp sockets
351	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
352	exit (1);
353	}	586	}
354	else	587	else
355	{	588	{
356	slog (L_ERR,	589	slog (L_ERR,
357	_("FATAL: unknown revents %08x in socket, terminating\n"),	590	_("FATAL: unknown revents %08x in socket, terminating\n"),
358	revents);	591	revents);
359	exit (1);	592	exit (EXIT_FAILURE);
		593	}
		594	}
		595	#endif
		596
		597	inline void
		598	vpn::udpv4_ev (ev::io &w, int revents)
		599	{
		600	if (revents & EV_READ)
360	}	601	{
361	}	602	vpn_packet *pkt = new vpn_packet;
		603	struct sockaddr_in sa;
		604	socklen_t sa_len = sizeof (sa);
		605	int len;
362		606
363	void	607	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		608
		609	sockinfo si(sa, PROT_UDPv4);
		610
		611	if (len > 0)
		612	{
		613	pkt->len = len;
		614
		615	recv_vpn_packet (pkt, si);
		616	}
		617	else
		618	{
		619	// probably ECONNRESET or somesuch
		620	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		621	}
		622
		623	delete pkt;
		624	}
		625	else
		626	{
		627	slog (L_ERR,
		628	_("FATAL: unknown revents %08x in socket, terminating\n"),
		629	revents);
		630	exit (EXIT_FAILURE);
		631	}
		632	}
		633
		634	inline void
364	vpn::tap_ev (io_watcher &w, short revents)	635	vpn::tap_ev (ev::io &w, int revents)
365	{	636	{
366	if (revents & POLLIN)	637	if (revents & EV_READ)
367	{	638	{
368	/* process data */	639	/* process data */
369	tap_packet *pkt;	640	tap_packet *pkt;
370		641
371	pkt = tap->recv ();	642	pkt = tap->recv ();
372		643
		644	if (!pkt)
		645	return;
		646
		647	if (pkt->len > 14)
		648	{
373	int dst = mac2id (pkt->dst);	649	int dst = mac2id (pkt->dst);
374	int src = mac2id (pkt->src);	650	int src = mac2id (pkt->src);
375		651
376	if (src != THISNODE->id)	652	if (src != THISNODE->id)
377	{
378	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
379	exit (1);
380	}
381
382	if (dst == THISNODE->id)
383	{
384	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
385	exit (1);
386	}
387
388	if (dst > conns.size ())
389	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
390	else
391	{
392	if (dst)
393	{	653	{
394	// unicast	654	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
395	if (dst != THISNODE->id)	655	exit (EXIT_FAILURE);
396	conns[dst - 1]->inject_data_packet (pkt);
397	}	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);
398	else	666	else
399	{
400	// broadcast, first check router, then self, then english
401	connection *router = find_router ();
402
403	if (router)
404	router->inject_data_packet (pkt, true);	667	inject_data_packet (pkt, dst);
405	else
406	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
407	if ((*c)->conf != THISNODE)
408	(*c)->inject_data_packet (pkt);
409	}
410	}	668	}
411		669
412	delete pkt;	670	delete pkt;
413	}
414	else if (revents & (POLLHUP \| POLLERR))
415	{
416	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
417	exit (1);
418	}	671	}
419	else	672	else
420	abort ();	673	abort ();
421	}	674	}
422		675
423	void	676	inline void
424	vpn::event_cb (time_watcher &w)	677	vpn::event_cb (ev::timer &w, int)
425	{	678	{
426	if (events)	679	if (events)
427	{	680	{
428	if (events & EVENT_SHUTDOWN)	681	if (events & EVENT_SHUTDOWN)
429	{	682	{
430	slog (L_INFO, _("preparing shutdown..."));	683	slog (L_INFO, _("preparing shutdown..."));
431		684
432	shutdown_all ();	685	shutdown_all ();
433
434	remove_pid (pidfilename);	686	remove_pid (conf.pidfilename);
435
436	slog (L_INFO, _("terminating"));	687	slog (L_INFO, _("terminating"));
437		688	exit (EXIT_SUCCESS);
438	exit (0);
439	}	689	}
440		690
441	if (events & EVENT_RECONNECT)	691	if (events & EVENT_RECONNECT)
442	{	692	{
443	slog (L_INFO, _("forced reconnect"));	693	slog (L_INFO, _("forced reconnect"));
…		…
445	reconnect_all ();	695	reconnect_all ();
446	}	696	}
447		697
448	events = 0;	698	events = 0;
449	}	699	}
450
451	w.at = TSTAMP_CANCEL;
452	}	700	}
453		701
454	void	702	void
455	vpn::shutdown_all ()	703	vpn::shutdown_all ()
456	{	704	{
…		…
469	connection_init ();	717	connection_init ();
470		718
471	for (configuration::node_vector::iterator i = conf.nodes.begin ();	719	for (configuration::node_vector::iterator i = conf.nodes.begin ();
472	i != conf.nodes.end (); ++i)	720	i != conf.nodes.end (); ++i)
473	{	721	{
474	connection *conn = new connection (this);	722	connection conn = new connection (this, i);
475
476	conn->conf = *i;
477	conns.push_back (conn);	723	conns.push_back (conn);
478
479	conn->establish_connection ();	724	conn->establish_connection ();
480	}	725	}
481	}	726	}
482		727
483	connection *vpn::find_router ()	728	connection *vpn::find_router ()
484	{	729	{
485	u32 prio = 0;	730	u32 prio = 1;
486	connection *router = 0;	731	connection *router = 0;
487		732
488	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	733	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489	{	734	{
490	connection c = i;	735	connection c = i;
491		736
492	if (c->conf->routerprio > prio	737	if (c->conf->routerprio > prio
493	&& c->connectmode == conf_node::C_ALWAYS	738	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
494	&& c->conf != THISNODE
495	&& c->ictx && c->octx)	739	&& c->ictx && c->octx
		740	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
496	{	741	{
497	prio = c->conf->routerprio;	742	prio = c->conf->routerprio;
498	router = c;	743	router = c;
499	}	744	}
500	}	745	}
…		…
509	if (c)	754	if (c)
510	c->send_connect_request (id);	755	c->send_connect_request (id);
511	else	756	else
512	// no router found, aggressively connect to all routers	757	// no router found, aggressively connect to all routers
513	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	758	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
514	if ((*i)->conf->routerprio)	759	if ((i)->conf->routerprio && (i)->conf != THISNODE)
515	(*i)->establish_connection ();	760	(*i)->establish_connection ();
516	}	761	}
517		762
518	void	763	void
519	connection::dump_status ()	764	connection::dump_status ()
…		…
528	}	773	}
529		774
530	void	775	void
531	vpn::dump_status ()	776	vpn::dump_status ()
532	{	777	{
533	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	778	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
534		779
535	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	780	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
536	(*c)->dump_status ();	781	(*c)->dump_status ();
537		782
538	slog (L_NOTICE, _("END status dump"));	783	slog (L_NOTICE, _("END status dump"));
539	}	784	}
540		785
541	vpn::vpn (void)	786	vpn::vpn (void)
542	: event(this, &vpn::event_cb)	787	{
		788	event .set<vpn, &vpn::event_cb > (this);
543	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	789	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
544	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	790	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
545	, tap_ev_watcher (this, &vpn::tap_ev)
546	#if ENABLE_TCP	791	#if ENABLE_TCP
547	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	792	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
548	#endif	793	#endif
549	{	794	#if ENABLE_ICMP
		795	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		796	#endif
		797	#if ENABLE_DNS
		798	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		799	#endif
		800	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
550	}	801	}
551		802
552	vpn::~vpn ()	803	vpn::~vpn ()
553	{	804	{
554	}	805	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.8 by pcg, Mon Apr 7 01:28:56 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 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.46 by pcg, Thu Aug 7 17:30:28 2008 UTC