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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.29 by pcg, Fri Mar 4 04:52:38 2005 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2005 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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 (int)	51	const char *vpn::script_if_up ()
46	{	52	{
47	// the tunnel device mtu should be the physical mtu - overhead	53	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	54	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	55	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		59
54	char *env;	60	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
68	putenv (env);	71	putenv (env);
69		72
71	}	74	}
72		75
73	int	76	int
74	vpn::setup ()	77	vpn::setup ()
75	{	78	{
76	sockinfo si;	79	ipv4_fd = -1;
77		80
78	si.set (THISNODE);	81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		82	{
		83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		84
		85	if (ipv4_fd < 0)
		86	return -1;
		87
		88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		91	// this I really consider a linux bug. I am neither connected
		92	// nor do I fragment myself. Linux still sets DF and doesn't
		93	// fragment for me sometimes.
		94	{
		95	int oval = IP_PMTUDISC_DONT;
		96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		97	}
		98	#endif
		99
		100	sockinfo si (THISNODE, PROT_IPv4);
		101
		102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		103	{
		104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		105	exit (EXIT_FAILURE);
		106	}
		107
		108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		109	}
79		110
80	udpv4_fd = -1;	111	udpv4_fd = -1;
81		112
82	if (THISNODE->protocols & PROT_UDPv4)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	114	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		116
86	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
87	return -1;	118	return -1;
88		119
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		121
		122	// standard daemon practise...
90	{	123	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	124	int oval = 1;
92	exit (1);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	126	}
94		127
95	#ifdef IP_MTU_DISCOVER	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	130	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	131	// fragment for me sometimes.
99	{	132	{
100	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	135	}
103	#endif	136	#endif
104		137
105	// standard daemon practise...	138	sockinfo si (THISNODE, PROT_UDPv4);
		139
		140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
		146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		147	}
		148
		149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
		152	if (THISNODE->protocols & PROT_ICMPv4)
		153	{
		154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		155
		156	if (icmpv4_fd < 0)
		157	return -1;
		158
		159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		160
		161	#ifdef ICMP_FILTER
106	{	162	{
107	int oval = 1;	163	icmp_filter oval;
		164	oval.data = 0xffffffff;
		165	if (::conf.icmp_type < 32)
		166	oval.data &= ~(1 << ::conf.icmp_type);
		167
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	169	}
		170	#endif
110		171
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
112	}
113
114	ipv4_fd = -1;
115	if (THISNODE->protocols & PROT_IPv4)
116	{
117	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
118
119	if (ipv4_fd < 0)
120	return -1;
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{
124	slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno));
125	exit (1);
126	}
127
128	#ifdef IP_MTU_DISCOVER
129	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	174	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	175	// fragment for me sometimes.
132	{	176	{
133	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	179	}
136	#endif	180	#endif
137		181
		182	sockinfo si (THISNODE, PROT_ICMPv4);
		183
		184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		185	{
		186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		187	exit (EXIT_FAILURE);
		188	}
		189
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		191	}
		192	#endif
		193
		194	tcpv4_fd = -1;
		195
		196	#if ENABLE_TCP
		197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		198	{
		199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		200
		201	if (tcpv4_fd < 0)
		202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		205
		206	// standard daemon practise...
		207	{
		208	int oval = 1;
		209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	210	}
		211
		212	sockinfo si (THISNODE, PROT_TCPv4);
		213
		214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		215	{
		216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		217	exit (EXIT_FAILURE);
		218	}
		219
		220	if (listen (tcpv4_fd, 5))
		221	{
		222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		234
		235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		236
		237	if (dnsv4_fd < 0)
		238	return -1;
		239
		240	// standard daemon practise...
		241	{
		242	int oval = 1;
		243	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		244	}
		245
		246	sockinfo si (THISNODE, PROT_DNSv4);
		247
		248	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		249	{
		250	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		251	exit (EXIT_FAILURE);
		252	}
		253
		254	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		255	}
		256	#endif
140		257
141	tap = new tap_device ();	258	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	259	if (!tap) //D this, of course, never catches
143	{	260	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	261	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	262	exit (EXIT_FAILURE);
146	}	263	}
147		264
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	265	run_script (run_script_cb (this, &vpn::script_if_up), true);
149		266
150	tap_ev_watcher.start (tap->fd, POLLIN);	267	tap_ev_watcher.start (tap->fd, EVENT_READ);
151		268
152	reconnect_all ();	269	reconnect_all ();
153		270
154	return 0;	271	return 0;
155	}	272	}
156		273
157	void	274	bool
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	275	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
159	{	276	{
		277	#if defined(SOL_IP) && defined(IP_TOS)
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	278	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		279	#endif
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	280	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
162	}
163		281
164	void	282	return true;
		283	}
		284
		285	static u16
		286	ipv4_checksum (u16 *data, unsigned int len)
		287	{
		288	// use 32 bit accumulator and fold back carry bits at the end
		289	u32 sum = 0;
		290
		291	while (len > 1)
		292	{
		293	sum += *data++;
		294	len -= 2;
		295	}
		296
		297	// odd byte left?
		298	if (len)
		299	sum += (u8 )data;
		300
		301	// add back carry bits
		302	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		303	sum += (sum >> 16); // carry
		304
		305	return ~sum;
		306	}
		307
		308	#if ENABLE_ICMP
		309	bool
		310	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		311	{
		312	#if defined(SOL_IP) && defined(IP_TOS)
		313	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		314	#endif
		315
		316	pkt->unshift_hdr (4);
		317
		318	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		319	hdr->type = ::conf.icmp_type;
		320	hdr->code = 255;
		321	hdr->checksum = 0;
		322	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		323
		324	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		325
		326	return true;
		327	}
		328	#endif
		329
		330	bool
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	331	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
166	{	332	{
		333	#if defined(SOL_IP) && defined(IP_TOS)
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	334	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		335	#endif
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	336	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		337
		338	return true;
		339	}
		340
		341	void
		342	vpn::inject_data_packet (tap_packet *pkt, int dst)
		343	{
		344	if (dst)
		345	{
		346	// unicast
		347	if (dst != THISNODE->id)
		348	conns[dst - 1]->inject_data_packet (pkt);
		349	}
		350	else
		351	{
		352	// broadcast, this is ugly, but due to the security policy
		353	// we have to connect to all hosts...
		354	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		355	if ((*c)->conf != THISNODE)
		356	(*c)->inject_data_packet (pkt, true);
		357	}
169	}	358	}
170		359
171	void	360	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	361	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	362	{
…		…
180	if (src == 0 \|\| src > conns.size ()	369	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	370	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	371	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	372	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	373	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		374	else if (dst > conns.size ())
		375	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		376	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	377	else
186	{	378	{
187	connection *c = conns[src - 1];	379	connection *c = conns[src - 1];
188		380
189	if (dst == 0 && !THISNODE->routerprio)	381	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	382	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	383	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	384	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	385	{
		386	if (THISNODE->routerprio)
		387	// the tos setting gets lost here. who cares.
		388	conns[dst - 1]->inject_vpn_packet (pkt);
		389	else
194	slog (L_WARN,	390	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	391	_("%s(%s): forwarding request (=> %s), but we are no router"),
		392	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	393	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	394	}
198	THISNODE->id, THISNODE->nodename);
199	else	395	else
200	c->recv_vpn_packet (pkt, rsi);	396	c->recv_vpn_packet (pkt, rsi);
201	}	397	}
202	}	398	}
203		399
204	void	400	void
205	vpn::udpv4_ev (short revents)	401	vpn::ipv4_ev (io_watcher &w, short revents)
206	{	402	{
207	if (revents & (POLLIN \| POLLERR))	403	if (revents & EVENT_READ)
208	{	404	{
209	vpn_packet *pkt = new vpn_packet;	405	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	406	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	407	socklen_t sa_len = sizeof (sa);
212	int len;	408	int len;
213		409
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	410	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		411
216	sockinfo si(sa);	412	sockinfo si(sa, PROT_IPv4);
217		413
218	if (len > 0)	414	if (len > 0)
219	{	415	{
220	pkt->len = len;	416	pkt->len = len;
		417
		418	// raw sockets deliver the ipv4, but don't expect it on sends
		419	// this is slow, but...
		420	pkt->skip_hdr (IP_OVERHEAD);
221		421
222	recv_vpn_packet (pkt, si);	422	recv_vpn_packet (pkt, si);
223	}	423	}
224	else	424	else
225	{	425	{
226	// probably ECONNRESET or somesuch	426	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	427	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	428	}
229		429
230	delete pkt;	430	delete pkt;
231	}
232	else if (revents & POLLHUP)
233	{
234	// this cannot ;) happen on udp sockets
235	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
236	exit (1);
237	}	431	}
238	else	432	else
239	{	433	{
240	slog (L_ERR,	434	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	435	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	436	revents);
243	exit (1);	437	exit (EXIT_FAILURE);
244	}	438	}
245	}	439	}
246		440
		441	#if ENABLE_ICMP
247	void	442	void
248	vpn::ipv4_ev (short revents)	443	vpn::icmpv4_ev (io_watcher &w, short revents)
249	{	444	{
250	if (revents & (POLLIN \| POLLERR))	445	if (revents & EVENT_READ)
251	{	446	{
252	vpn_packet *pkt = new vpn_packet;	447	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	448	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	449	socklen_t sa_len = sizeof (sa);
255	int len;	450	int len;
256		451
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	452	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		453
259	sockinfo si(sa, PROT_IPv4);	454	sockinfo si(sa, PROT_ICMPv4);
260		455
261	if (len > 0)	456	if (len > 0)
262	{	457	{
263	pkt->len = len;	458	pkt->len = len;
264		459
		460	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		461
		462	if (hdr->type == ::conf.icmp_type
		463	&& hdr->code == 255)
		464	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	465	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	466	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	467	pkt->skip_hdr (ICMP_OVERHEAD);
268		468
269	recv_vpn_packet (pkt, si);	469	recv_vpn_packet (pkt, si);
		470	}
270	}	471	}
271	else	472	else
272	{	473	{
273	// probably ECONNRESET or somesuch	474	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	475	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	476	}
276		477
277	delete pkt;	478	delete pkt;
278	}
279	else if (revents & POLLHUP)
280	{
281	// this cannot ;) happen on udp sockets
282	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
283	exit (1);
284	}	479	}
285	else	480	else
286	{	481	{
287	slog (L_ERR,	482	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	483	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	484	revents);
290	exit (1);	485	exit (EXIT_FAILURE);
		486	}
		487	}
		488	#endif
		489
		490	void
		491	vpn::udpv4_ev (io_watcher &w, short revents)
		492	{
		493	if (revents & EVENT_READ)
291	}	494	{
292	}	495	vpn_packet *pkt = new vpn_packet;
		496	struct sockaddr_in sa;
		497	socklen_t sa_len = sizeof (sa);
		498	int len;
293		499
		500	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		501
		502	sockinfo si(sa, PROT_UDPv4);
		503
		504	if (len > 0)
		505	{
		506	pkt->len = len;
		507
		508	recv_vpn_packet (pkt, si);
		509	}
		510	else
		511	{
		512	// probably ECONNRESET or somesuch
		513	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		514	}
		515
		516	delete pkt;
		517	}
		518	else
		519	{
		520	slog (L_ERR,
		521	_("FATAL: unknown revents %08x in socket, terminating\n"),
		522	revents);
		523	exit (EXIT_FAILURE);
		524	}
		525	}
		526
294	void	527	void
295	vpn::tap_ev (short revents)	528	vpn::tap_ev (io_watcher &w, short revents)
296	{	529	{
297	if (revents & POLLIN)	530	if (revents & EVENT_READ)
298	{	531	{
299	/* process data */	532	/* process data */
300	tap_packet *pkt;	533	tap_packet *pkt;
301		534
302	pkt = tap->recv ();	535	pkt = tap->recv ();
303		536
		537	if (!pkt)
		538	return;
		539
		540	if (pkt->len > 14)
		541	{
304	int dst = mac2id (pkt->dst);	542	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	543	int src = mac2id (pkt->src);
306		544
307	if (src != THISNODE->id)	545	if (src != THISNODE->id)
308	{
309	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
310	exit (1);
311	}
312
313	if (dst == THISNODE->id)
314	{
315	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
316	exit (1);
317	}
318
319	if (dst > conns.size ())
320	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
321	else
322	{
323	if (dst)
324	{	546	{
325	// unicast	547	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
326	if (dst != THISNODE->id)	548	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	549	}
		550
		551	if (dst == THISNODE->id)
		552	{
		553	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		554	exit (EXIT_FAILURE);
		555	}
		556
		557	if (dst > conns.size ())
		558	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	559	else
330	{
331	// broadcast, first check router, then self, then english
332	connection *router = find_router ();
333
334	if (router)
335	router->inject_data_packet (pkt, true);	560	inject_data_packet (pkt, dst);
336	else
337	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
338	if ((*c)->conf != THISNODE)
339	(*c)->inject_data_packet (pkt);
340	}
341	}	561	}
342		562
343	delete pkt;	563	delete pkt;
344	}
345	else if (revents & (POLLHUP \| POLLERR))
346	{
347	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
348	exit (1);
349	}	564	}
350	else	565	else
351	abort ();	566	abort ();
352	}	567	}
353		568
354	void	569	void
355	vpn::event_cb (tstamp &ts)	570	vpn::event_cb (time_watcher &w)
356	{	571	{
357	if (events)	572	if (events)
358	{	573	{
359	if (events & EVENT_SHUTDOWN)	574	if (events & EVENT_SHUTDOWN)
360	{	575	{
361	slog (L_INFO, _("preparing shutdown..."));	576	slog (L_INFO, _("preparing shutdown..."));
362		577
363	shutdown_all ();	578	shutdown_all ();
364
365	remove_pid (pidfilename);	579	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	580	slog (L_INFO, _("terminating"));
368		581	exit (EXIT_SUCCESS);
369	exit (0);
370	}	582	}
371		583
372	if (events & EVENT_RECONNECT)	584	if (events & EVENT_RECONNECT)
373	{	585	{
374	slog (L_INFO, _("forced reconnect"));	586	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	588	reconnect_all ();
377	}	589	}
378		590
379	events = 0;	591	events = 0;
380	}	592	}
381
382	ts = TSTAMP_CANCEL;
383	}	593	}
384		594
385	void	595	void
386	vpn::shutdown_all ()	596	vpn::shutdown_all ()
387	{	597	{
…		…
400	connection_init ();	610	connection_init ();
401		611
402	for (configuration::node_vector::iterator i = conf.nodes.begin ();	612	for (configuration::node_vector::iterator i = conf.nodes.begin ();
403	i != conf.nodes.end (); ++i)	613	i != conf.nodes.end (); ++i)
404	{	614	{
405	connection *conn = new connection (this);	615	connection conn = new connection (this, i);
406
407	conn->conf = *i;
408	conns.push_back (conn);	616	conns.push_back (conn);
409
410	conn->establish_connection ();	617	conn->establish_connection ();
411	}	618	}
412	}	619	}
413		620
414	connection *vpn::find_router ()	621	connection *vpn::find_router ()
415	{	622	{
416	u32 prio = 0;	623	u32 prio = 1;
417	connection *router = 0;	624	connection *router = 0;
418		625
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	626	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	627	{
421	connection c = i;	628	connection c = i;
422		629
423	if (c->conf->routerprio > prio	630	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	631	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
425	&& c->conf != THISNODE
426	&& c->ictx && c->octx)	632	&& c->ictx && c->octx
		633	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	634	{
428	prio = c->conf->routerprio;	635	prio = c->conf->routerprio;
429	router = c;	636	router = c;
430	}	637	}
431	}	638	}
432		639
433	return router;	640	return router;
434	}	641	}
435		642
436	void vpn::connect_request (int id)	643	void vpn::send_connect_request (int id)
437	{	644	{
438	connection *c = find_router ();	645	connection *c = find_router ();
439		646
440	if (c)	647	if (c)
441	c->connect_request (id);	648	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	649	else
443	// // no router found, aggressively connect to all routers	650	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	651	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	652	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	653	(*i)->establish_connection ();
447	}	654	}
448		655
449	void	656	void
450	connection::dump_status ()	657	connection::dump_status ()
451	{	658	{
…		…
468		675
469	slog (L_NOTICE, _("END status dump"));	676	slog (L_NOTICE, _("END status dump"));
470	}	677	}
471		678
472	vpn::vpn (void)	679	vpn::vpn (void)
		680	: event (this, &vpn::event_cb)
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	681	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	682	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
		683	#if ENABLE_TCP
		684	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
		685	#endif
		686	#if ENABLE_ICMP
		687	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		688	#endif
		689	#if ENABLE_DNS
		690	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		691	#endif
475	, tap_ev_watcher(this, &vpn::tap_ev)	692	, tap_ev_watcher (this, &vpn::tap_ev)
476	, event(this, &vpn::event_cb)
477	{	693	{
478	}	694	}
479		695
480	vpn::~vpn ()	696	vpn::~vpn ()
481	{	697	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.29 by pcg, Fri Mar 4 04:52:38 2005 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.29 by pcg, Fri Mar 4 04:52:38 2005 UTC