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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.5 by pcg, Sat Apr 5 02:32:40 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;
		118	ipv4_fd = -1;
		119
		120	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		121	{
		122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		123
		124	if (ipv4_fd < 0)
		125	return -1;
		126
		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)
		131	// this I really consider a linux bug. I am neither connected
		132	// nor do I fragment myself. Linux still sets DF and doesn't
		133	// fragment for me sometimes.
		134	{
		135	int oval = IP_PMTUDISC_DONT;
		136	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		137	}
		138	#endif
		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
		148	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		149	}
		150
		151	udpv4_tos = -1;
76	udpv4_fd = -1;	152	udpv4_fd = -1;
77		153
78	if (THISNODE->protocols & PROT_UDPv4)	154	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	155	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		157
82	if (udpv4_fd < 0)	158	if (udpv4_fd < 0)
83	return -1;	159	return -1;
		160
		161	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		162	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
84		163
85	// standard daemon practise...	164	// standard daemon practise...
86	{	165	{
87	int oval = 1;	166	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	167	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	168	}
90		169
91	sockinfo si (THISNODE, PROT_UDPv4);	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92
93	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
94	{
95	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
96	exit (1);
97	}
98
99	#ifdef IP_MTU_DISCOVER
100	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
101	// 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
102	// fragment for me sometimes.	173	// fragment for me sometimes.
103	{	174	{
104	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	177	}
107	#endif	178	#endif
108		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
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	188	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
110	}	189	}
111		190
		191	icmpv4_tos = -1;
112	ipv4_fd = -1;	192	icmpv4_fd = -1;
		193
		194	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	195	if (THISNODE->protocols & PROT_ICMPv4)
114	{	196	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	197	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		198
117	if (ipv4_fd < 0)	199	if (icmpv4_fd < 0)
118	return -1;	200	return -1;
119		201
120	sockinfo si (THISNODE, PROT_IPv4);	202	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		203	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
121		204
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	205	#ifdef ICMP_FILTER
123	{	206	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	207	icmp_filter oval;
125	exit (1);	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);
126	}	213	}
		214	#endif
127		215
128	#ifdef IP_MTU_DISCOVER	216	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	217	// this I really consider a linux bug. I am neither connected
130	// 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
131	// fragment for me sometimes.	219	// fragment for me sometimes.
132	{	220	{
133	int oval = IP_PMTUDISC_DONT;	221	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	223	}
136	#endif	224	#endif
137		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
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	234	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
139	}	235	}
		236	#endif
		237
		238	tcpv4_fd = -1;
140		239
141	#if ENABLE_TCP	240	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	241	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	242	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	243	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		244
146	if (tcpv4_fd < 0)	245	if (tcpv4_fd < 0)
147	return -1;	246	return -1;
		247
		248	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		249	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
148		250
149	// standard daemon practise...	251	// standard daemon practise...
150	{	252	{
151	int oval = 1;	253	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	254	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
155	sockinfo si (THISNODE, PROT_TCPv4);	257	sockinfo si (THISNODE, PROT_TCPv4);
156		258
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	260	{
159	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));
160	exit (1);	262	exit (EXIT_FAILURE);
161	}	263	}
162		264
163	if (listen (tcpv4_fd, 5))	265	if (listen (tcpv4_fd, 5))
164	{	266	{
165	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));
166	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);
167	}	298	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#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	/////////////////////////////////////////////////////////////////////////////
172		326
173	tap = new tap_device ();	327	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	328	if (!tap) //D this, of course, never catches
175	{	329	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	330	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	331	exit (EXIT_FAILURE);
178	}	332	}
179		333
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	334	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		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
182	tap_ev_watcher.start (tap->fd, POLLIN);	354	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		355
186	return 0;	356	return 0;
187	}	357	}
188		358
189	// send a vpn packet out to other hosts	359	bool
		360	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		361	{
		362	set_tos (ipv4_fd, ipv4_tos, tos);
		363	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		364
		365	return true;
		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
		409
		410	bool
		411	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		412	{
		413	set_tos (udpv4_fd, udpv4_tos, tos);
		414	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		415
		416	return true;
		417	}
		418
190	void	419	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	420	vpn::inject_data_packet (tap_packet *pkt, int dst)
192	{	421	{
193	switch (si.prot)	422	if (dst)
194	{
195	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);
197	break;
198
199	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);
201	break;
202
203	#if ENABLE_TCP
204	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);
206	break;
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();
212	}	423	{
213	}	424	// unicast
214		425	if (dst != THISNODE->id)
215	void	426	conns[dst - 1]->inject_data_packet (pkt);
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	427	}
217	{	428	else
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	429	{
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	430	// broadcast, this is ugly, but due to the security policy
220	}	431	// we have to connect to all hosts...
221		432	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
222	void	433	if ((*c)->conf != THISNODE)
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	434	(*c)->inject_data_packet (pkt);
224	{	435	}
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
227	}	436	}
228		437
229	void	438	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	439	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	440	{
…		…
238	if (src == 0 \|\| src > conns.size ()	447	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	448	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	449	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	450	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	451	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		452	else if (dst > conns.size ())
		453	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		454	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else	455	else
244	{	456	{
245	connection *c = conns[src - 1];	457	connection *c = conns[src - 1];
246		458
247	if (dst == 0 && !THISNODE->routerprio)	459	if (dst == 0)
248	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	460	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
249	c->conf->nodename, (const char *)rsi);	461	c->conf->nodename, (const char *)rsi);
250	else if (dst != 0 && dst != THISNODE->id)	462	else if (dst != THISNODE->id)
251	// FORWARDING NEEDED ;)	463	{
		464	if (THISNODE->routerprio)
		465	// the tos setting gets lost here. who cares.
		466	conns[dst - 1]->inject_vpn_packet (pkt);
		467	else
252	slog (L_WARN,	468	slog (L_WARN,
253	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	469	_("%s(%s): forwarding request (=> %s), but we are no router"),
		470	c->conf->nodename, (const char *)rsi,
254	dst, conns[dst - 1]->conf->nodename,	471	conns[dst - 1]->conf->nodename);
255	(const char *)rsi,	472	}
256	THISNODE->id, THISNODE->nodename);
257	else	473	else
258	c->recv_vpn_packet (pkt, rsi);	474	c->recv_vpn_packet (pkt, rsi);
259	}	475	}
260	}	476	}
261		477
262	void	478	bool
263	vpn::udpv4_ev (io_watcher &w, short revents)	479	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
264	{	480	{
265	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)
266	{	512	{
267	vpn_packet *pkt = new vpn_packet;	513	vpn_packet *pkt = new vpn_packet;
268	struct sockaddr_in sa;	514	struct sockaddr_in sa;
269	socklen_t sa_len = sizeof (sa);	515	socklen_t sa_len = sizeof (sa);
270	int len;	516	int len;
271		517
272	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);
273		519
274	sockinfo si(sa, PROT_UDPv4);	520	sockinfo si(sa, PROT_IPv4);
275		521
276	if (len > 0)	522	if (len > 0)
277	{	523	{
278	pkt->len = len;	524	pkt->len = len;
279		525
		526	// raw sockets deliver the ipv4 header, but don't expect it on sends
		527	pkt->skip_hdr (IP_OVERHEAD);
		528
280	recv_vpn_packet (pkt, si);	529	recv_vpn_packet (pkt, si);
281	}	530	}
282	else	531	else
283	{	532	{
284	// probably ECONNRESET or somesuch	533	// probably ECONNRESET or somesuch
285	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));
286	}	535	}
287		536
288	delete pkt;	537	delete pkt;
289	}	538	}
290	else if (revents & POLLHUP)
291	{
292	// this cannot ;) happen on udp sockets
293	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
294	exit (1);
295	}
296	else	539	else
297	{	540	{
298	slog (L_ERR,	541	slog (L_ERR,
299	_("FATAL: unknown revents %08x in socket, terminating\n"),	542	_("FATAL: unknown revents %08x in socket, terminating\n"),
300	revents);	543	revents);
301	exit (1);	544	exit (EXIT_FAILURE);
302	}	545	}
303	}	546	}
304		547
305	void	548	#if ENABLE_ICMP
		549	inline void
306	vpn::ipv4_ev (io_watcher &w, short revents)	550	vpn::icmpv4_ev (ev::io &w, int revents)
307	{	551	{
308	if (revents & (POLLIN \| POLLERR))	552	if (revents & EV_READ)
309	{	553	{
310	vpn_packet *pkt = new vpn_packet;	554	vpn_packet *pkt = new vpn_packet;
311	struct sockaddr_in sa;	555	struct sockaddr_in sa;
312	socklen_t sa_len = sizeof (sa);	556	socklen_t sa_len = sizeof (sa);
313	int len;	557	int len;
314		558
315	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);
316		560
317	sockinfo si(sa, PROT_IPv4);	561	sockinfo si(sa, PROT_ICMPv4);
318		562
319	if (len > 0)	563	if (len > 0)
320	{	564	{
321	pkt->len = len;	565	pkt->len = len;
322		566
		567	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		568
		569	if (hdr->type == ::conf.icmp_type
		570	&& hdr->code == 255)
		571	{
323	// 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
324	// this is slow, but...	573	// this is slow, but...
325	pkt->skip_hdr (IP_OVERHEAD);	574	pkt->skip_hdr (ICMP_OVERHEAD);
326		575
327	recv_vpn_packet (pkt, si);	576	recv_vpn_packet (pkt, si);
		577	}
328	}	578	}
329	else	579	else
330	{	580	{
331	// probably ECONNRESET or somesuch	581	// probably ECONNRESET or somesuch
332	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	582	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
333	}	583	}
334		584
335	delete pkt;	585	delete pkt;
336	}
337	else if (revents & POLLHUP)
338	{
339	// this cannot ;) happen on udp sockets
340	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
341	exit (1);
342	}	586	}
343	else	587	else
344	{	588	{
345	slog (L_ERR,	589	slog (L_ERR,
346	_("FATAL: unknown revents %08x in socket, terminating\n"),	590	_("FATAL: unknown revents %08x in socket, terminating\n"),
347	revents);	591	revents);
348	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)
349	}	601	{
350	}	602	vpn_packet *pkt = new vpn_packet;
		603	struct sockaddr_in sa;
		604	socklen_t sa_len = sizeof (sa);
		605	int len;
351		606
352	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
353	vpn::tap_ev (io_watcher &w, short revents)	635	vpn::tap_ev (ev::io &w, int revents)
354	{	636	{
355	if (revents & POLLIN)	637	if (revents & EV_READ)
356	{	638	{
357	/* process data */	639	/* process data */
358	tap_packet *pkt;	640	tap_packet *pkt;
359		641
360	pkt = tap->recv ();	642	pkt = tap->recv ();
361		643
		644	if (!pkt)
		645	return;
		646
		647	if (pkt->len > 14)
		648	{
362	int dst = mac2id (pkt->dst);	649	int dst = mac2id (pkt->dst);
363	int src = mac2id (pkt->src);	650	int src = mac2id (pkt->src);
364		651
365	if (src != THISNODE->id)	652	if (src != THISNODE->id)
366	{
367	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
368	exit (1);
369	}
370
371	if (dst == THISNODE->id)
372	{
373	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
374	exit (1);
375	}
376
377	if (dst > conns.size ())
378	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
379	else
380	{
381	if (dst)
382	{	653	{
383	// unicast	654	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
384	if (dst != THISNODE->id)	655	exit (EXIT_FAILURE);
385	conns[dst - 1]->inject_data_packet (pkt);
386	}	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);
387	else	666	else
388	{
389	// broadcast, first check router, then self, then english
390	connection *router = find_router ();
391
392	if (router)
393	router->inject_data_packet (pkt, true);	667	inject_data_packet (pkt, dst);
394	else
395	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
396	if ((*c)->conf != THISNODE)
397	(*c)->inject_data_packet (pkt);
398	}
399	}	668	}
400		669
401	delete pkt;	670	delete pkt;
402	}
403	else if (revents & (POLLHUP \| POLLERR))
404	{
405	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
406	exit (1);
407	}	671	}
408	else	672	else
409	abort ();	673	abort ();
410	}	674	}
411		675
412	void	676	inline void
413	vpn::event_cb (time_watcher &w)	677	vpn::event_cb (ev::timer &w, int)
414	{	678	{
415	if (events)	679	if (events)
416	{	680	{
417	if (events & EVENT_SHUTDOWN)	681	if (events & EVENT_SHUTDOWN)
418	{	682	{
419	slog (L_INFO, _("preparing shutdown..."));	683	slog (L_INFO, _("preparing shutdown..."));
420		684
421	shutdown_all ();	685	shutdown_all ();
422
423	remove_pid (pidfilename);	686	remove_pid (conf.pidfilename);
424
425	slog (L_INFO, _("terminating"));	687	slog (L_INFO, _("terminating"));
426		688	exit (EXIT_SUCCESS);
427	exit (0);
428	}	689	}
429		690
430	if (events & EVENT_RECONNECT)	691	if (events & EVENT_RECONNECT)
431	{	692	{
432	slog (L_INFO, _("forced reconnect"));	693	slog (L_INFO, _("forced reconnect"));
…		…
434	reconnect_all ();	695	reconnect_all ();
435	}	696	}
436		697
437	events = 0;	698	events = 0;
438	}	699	}
439
440	w.at = TSTAMP_CANCEL;
441	}	700	}
442		701
443	void	702	void
444	vpn::shutdown_all ()	703	vpn::shutdown_all ()
445	{	704	{
…		…
458	connection_init ();	717	connection_init ();
459		718
460	for (configuration::node_vector::iterator i = conf.nodes.begin ();	719	for (configuration::node_vector::iterator i = conf.nodes.begin ();
461	i != conf.nodes.end (); ++i)	720	i != conf.nodes.end (); ++i)
462	{	721	{
463	connection *conn = new connection (this);	722	connection conn = new connection (this, i);
464
465	conn->conf = *i;
466	conns.push_back (conn);	723	conns.push_back (conn);
467
468	conn->establish_connection ();	724	conn->establish_connection ();
469	}	725	}
470	}	726	}
471		727
472	connection *vpn::find_router ()	728	connection *vpn::find_router ()
473	{	729	{
474	u32 prio = 0;	730	u32 prio = 1;
475	connection *router = 0;	731	connection *router = 0;
476		732
477	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	733	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
478	{	734	{
479	connection c = i;	735	connection c = i;
480		736
481	if (c->conf->routerprio > prio	737	if (c->conf->routerprio > prio
482	&& c->connectmode == conf_node::C_ALWAYS	738	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
483	&& c->conf != THISNODE
484	&& c->ictx && c->octx)	739	&& c->ictx && c->octx
		740	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
485	{	741	{
486	prio = c->conf->routerprio;	742	prio = c->conf->routerprio;
487	router = c;	743	router = c;
488	}	744	}
489	}	745	}
490		746
491	return router;	747	return router;
492	}	748	}
493		749
494	void vpn::connect_request (int id)	750	void vpn::send_connect_request (int id)
495	{	751	{
496	connection *c = find_router ();	752	connection *c = find_router ();
497		753
498	if (c)	754	if (c)
499	c->connect_request (id);	755	c->send_connect_request (id);
500	//else // does not work, because all others must connect to the same router	756	else
501	// // no router found, aggressively connect to all routers	757	// no router found, aggressively connect to all routers
502	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	758	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
503	// if ((*i)->conf->routerprio)	759	if ((i)->conf->routerprio && (i)->conf != THISNODE)
504	// (*i)->establish_connection ();	760	(*i)->establish_connection ();
505	}	761	}
506		762
507	void	763	void
508	connection::dump_status ()	764	connection::dump_status ()
509	{	765	{
…		…
517	}	773	}
518		774
519	void	775	void
520	vpn::dump_status ()	776	vpn::dump_status ()
521	{	777	{
522	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	778	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
523		779
524	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	780	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
525	(*c)->dump_status ();	781	(*c)->dump_status ();
526		782
527	slog (L_NOTICE, _("END status dump"));	783	slog (L_NOTICE, _("END status dump"));
528	}	784	}
529		785
530	vpn::vpn (void)	786	vpn::vpn (void)
531	: event(this, &vpn::event_cb)	787	{
		788	event .set<vpn, &vpn::event_cb > (this);
532	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	789	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
533	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	790	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
534	, tap_ev_watcher (this, &vpn::tap_ev)
535	#if ENABLE_TCP	791	#if ENABLE_TCP
536	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	792	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
537	#endif	793	#endif
538	{	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);
539	}	801	}
540		802
541	vpn::~vpn ()	803	vpn::~vpn ()
542	{	804	{
543	}	805	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.5 by pcg, Sat Apr 5 02:32:40 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 1.5 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.46 by pcg, Thu Aug 7 17:30:28 2008 UTC