[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 1.25 by pcg, Sun Jul 25 18:11:40 2004 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
3		4
4	This program is free software; you can redistribute it and/or modify	5	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	6	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	7	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	8	(at your option) any later version.
18		19
19	#include "config.h"	20	#include "config.h"
20		21
21	#include <list>	22	#include <list>
22		23
		24	#include <cstdio>
		25	#include <cstring>
23	#include <cstdlib>	26	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		27
27	#include <sys/types.h>	28	#include <sys/types.h>
28	#include <sys/socket.h>	29	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	30	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	31	#include <errno.h>
34	#include <time.h>	32	#include <time.h>
35	#include <unistd.h>	33	#include <unistd.h>
		34	#include <fcntl.h>
		35	#include <sys/socket.h>
		36
		37	#include "netcompat.h"
36		38
37	#include "pidfile.h"	39	#include "pidfile.h"
38		40
39	#include "connection.h"	41	#include "connection.h"
40	#include "util.h"	42	#include "util.h"
41	#include "vpn.h"	43	#include "vpn.h"
42		44
		45	vpn network; // THE vpn (bad design...)
		46
43	/////////////////////////////////////////////////////////////////////////////	47	/////////////////////////////////////////////////////////////////////////////
44		48
45	const char *vpn::script_if_up (int)	49	const char *vpn::script_if_up ()
46	{	50	{
47	// the tunnel device mtu should be the physical mtu - overhead	51	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	52	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	53	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		57
54	char *env;	58	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);	61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	65	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);	68	THISNODE->id & 0xff);
68	putenv (env);	69	putenv (env);
69		70
…		…
71	}	72	}
72		73
73	int	74	int
74	vpn::setup ()	75	vpn::setup ()
75	{	76	{
76	sockinfo si;	77	ipv4_fd = -1;
77		78
78	si.set (THISNODE);	79	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		80	{
		81	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		82
		83	if (ipv4_fd < 0)
		84	return -1;
		85
		86	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		87
		88	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		89	// this I really consider a linux bug. I am neither connected
		90	// nor do I fragment myself. Linux still sets DF and doesn't
		91	// fragment for me sometimes.
		92	{
		93	int oval = IP_PMTUDISC_DONT;
		94	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		95	}
		96	#endif
		97
		98	sockinfo si (THISNODE, PROT_IPv4);
		99
		100	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		101	{
		102	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		103	exit (EXIT_FAILURE);
		104	}
		105
		106	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		107	}
79		108
80	udpv4_fd = -1;	109	udpv4_fd = -1;
81		110
82	if (THISNODE->protocols & PROT_UDPv4)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
83	{	112	{
84	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
85		114
86	if (udpv4_fd < 0)	115	if (udpv4_fd < 0)
87	return -1;	116	return -1;
88		117
89	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		119
		120	// standard daemon practise...
90	{	121	{
91	slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno));	122	int oval = 1;
92	exit (1);	123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
93	}	124	}
94		125
95	#ifdef IP_MTU_DISCOVER	126	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
96	// this I really consider a linux bug. I am neither connected	127	// this I really consider a linux bug. I am neither connected
97	// nor do I fragment myself. Linux still sets DF and doesn't	128	// nor do I fragment myself. Linux still sets DF and doesn't
98	// fragment for me sometimes.	129	// fragment for me sometimes.
99	{	130	{
100	int oval = IP_PMTUDISC_DONT;	131	int oval = IP_PMTUDISC_DONT;
101	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	132	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
102	}	133	}
103	#endif	134	#endif
104		135
105	// standard daemon practise...	136	sockinfo si (THISNODE, PROT_UDPv4);
		137
		138	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		139	{
		140	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		141	exit (EXIT_FAILURE);
		142	}
		143
		144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
		145	}
		146
		147	icmpv4_fd = -1;
		148
		149	#if ENABLE_ICMP
		150	if (THISNODE->protocols & PROT_ICMPv4)
		151	{
		152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		153
		154	if (icmpv4_fd < 0)
		155	return -1;
		156
		157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		158
		159	#ifdef ICMP_FILTER
106	{	160	{
107	int oval = 1;	161	icmp_filter oval;
		162	oval.data = 0xffffffff;
		163	if (::conf.icmp_type < 32)
		164	oval.data &= ~(1 << ::conf.icmp_type);
		165
108	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	166	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
109	}	167	}
		168	#endif
110		169
111	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	170	#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	171	// this I really consider a linux bug. I am neither connected
130	// 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
131	// fragment for me sometimes.	173	// fragment for me sometimes.
132	{	174	{
133	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135	}	177	}
136	#endif	178	#endif
137		179
		180	sockinfo si (THISNODE, PROT_ICMPv4);
		181
		182	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		183	{
		184	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		185	exit (EXIT_FAILURE);
		186	}
		187
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
		189	}
		190	#endif
		191
		192	tcpv4_fd = -1;
		193
		194	#if ENABLE_TCP
		195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
		196	{
		197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
		198
		199	if (tcpv4_fd < 0)
		200	return -1;
		201
		202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		203
		204	// standard daemon practise...
		205	{
		206	int oval = 1;
		207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
139	}	208	}
		209
		210	sockinfo si (THISNODE, PROT_TCPv4);
		211
		212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		213	{
		214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		215	exit (EXIT_FAILURE);
		216	}
		217
		218	if (listen (tcpv4_fd, 5))
		219	{
		220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		221	exit (EXIT_FAILURE);
		222	}
		223
		224	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		225	}
		226	#endif
		227
		228	#if ENABLE_DNS
		229	if (THISNODE->protocols & PROT_DNSv4)
		230	{
		231	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		232
		233	if (dnsv4_fd < 0)
		234	return -1;
		235
		236	// standard daemon practise...
		237	{
		238	int oval = 1;
		239	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		240	}
		241
		242	sockinfo si (THISNODE, PROT_DNSv4);
		243
		244	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		245	{
		246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
		249
		250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
		251	}
		252	#endif
140		253
141	tap = new tap_device ();	254	tap = new tap_device ();
142	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
143	{	256	{
144	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
145	exit (1);	258	exit (EXIT_FAILURE);
146	}	259	}
147		260
148	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
149		262
150	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
151		264
152	reconnect_all ();	265	reconnect_all ();
153		266
154	return 0;	267	return 0;
155	}	268	}
156		269
157	void	270	// send a vpn packet out to other hosts
		271	bool
		272	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		273	{
		274	switch (si.prot)
		275	{
		276	case PROT_IPv4:
		277	return send_ipv4_packet (pkt, si, tos);
		278
		279	case PROT_UDPv4:
		280	return send_udpv4_packet (pkt, si, tos);
		281
		282	#if ENABLE_TCP
		283	case PROT_TCPv4:
		284	return send_tcpv4_packet (pkt, si, tos);
		285	#endif
		286
		287	#if ENABLE_ICMP
		288	case PROT_ICMPv4:
		289	return send_icmpv4_packet (pkt, si, tos);
		290	#endif
		291
		292	#if ENABLE_DNS
		293	case PROT_DNSv4:
		294	return send_dnsv4_packet (pkt, si, tos);
		295	#endif
		296
		297	default:
		298	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		299	return false;
		300	}
		301	}
		302
		303	bool
158	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	304	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
159	{	305	{
		306	#if defined(SOL_IP) && defined(IP_TOS)
160	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	307	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		308	#endif
161	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	309	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
162	}
163		310
164	void	311	return true;
		312	}
		313
		314	static u16
		315	ipv4_checksum (u16 *data, unsigned int len)
		316	{
		317	// use 32 bit accumulator and fold back carry bits at the end
		318	u32 sum = 0;
		319
		320	while (len > 1)
		321	{
		322	sum += *data++;
		323	len -= 2;
		324	}
		325
		326	// odd byte left?
		327	if (len)
		328	sum += (u8 )data;
		329
		330	// add back carry bits
		331	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		332	sum += (sum >> 16); // carry
		333
		334	return ~sum;
		335	}
		336
		337	#if ENABLE_ICMP
		338	bool
		339	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		340	{
		341	#if defined(SOL_IP) && defined(IP_TOS)
		342	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		343	#endif
		344
		345	pkt->unshift_hdr (4);
		346
		347	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		348	hdr->type = ::conf.icmp_type;
		349	hdr->code = 255;
		350	hdr->checksum = 0;
		351	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		352
		353	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		354
		355	return true;
		356	}
		357	#endif
		358
		359	bool
165	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	360	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
166	{	361	{
		362	#if defined(SOL_IP) && defined(IP_TOS)
167	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		364	#endif
168	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	365	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		366
		367	return true;
		368	}
		369
		370	void
		371	vpn::inject_data_packet (tap_packet *pkt, int dst)
		372	{
		373	if (dst)
		374	{
		375	// unicast
		376	if (dst != THISNODE->id)
		377	conns[dst - 1]->inject_data_packet (pkt);
		378	}
		379	else
		380	{
		381	// broadcast, this is ugly, but due to the security policy
		382	// we have to connect to all hosts...
		383	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		384	if ((*c)->conf != THISNODE)
		385	(*c)->inject_data_packet (pkt, true);
		386	}
169	}	387	}
170		388
171	void	389	void
172	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
173	{	391	{
…		…
180	if (src == 0 \|\| src > conns.size ()	398	if (src == 0 \|\| src > conns.size ()
181	\|\| dst > conns.size ()	399	\|\| dst > conns.size ()
182	\|\| pkt->typ () >= vpn_packet::PT_MAX)	400	\|\| pkt->typ () >= vpn_packet::PT_MAX)
183	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	401	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
184	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	402	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		403	else if (dst > conns.size ())
		404	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		405	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
185	else	406	else
186	{	407	{
187	connection *c = conns[src - 1];	408	connection *c = conns[src - 1];
188		409
189	if (dst == 0 && !THISNODE->routerprio)	410	if (dst == 0)
190	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
191	c->conf->nodename, (const char *)rsi);	412	c->conf->nodename, (const char *)rsi);
192	else if (dst != 0 && dst != THISNODE->id)	413	else if (dst != THISNODE->id)
193	// FORWARDING NEEDED ;)	414	{
		415	if (THISNODE->routerprio)
		416	// the tos setting gets lost here. who cares.
		417	conns[dst - 1]->inject_vpn_packet (pkt);
		418	else
194	slog (L_WARN,	419	slog (L_WARN,
195	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	420	_("%s(%s): forwarding request (=> %s), but we are no router"),
		421	c->conf->nodename, (const char *)rsi,
196	dst, conns[dst - 1]->conf->nodename,	422	conns[dst - 1]->conf->nodename);
197	(const char *)rsi,	423	}
198	THISNODE->id, THISNODE->nodename);
199	else	424	else
200	c->recv_vpn_packet (pkt, rsi);	425	c->recv_vpn_packet (pkt, rsi);
201	}	426	}
202	}	427	}
203		428
204	void	429	void
205	vpn::udpv4_ev (short revents)	430	vpn::ipv4_ev (io_watcher &w, short revents)
206	{	431	{
207	if (revents & (POLLIN \| POLLERR))	432	if (revents & EVENT_READ)
208	{	433	{
209	vpn_packet *pkt = new vpn_packet;	434	vpn_packet *pkt = new vpn_packet;
210	struct sockaddr_in sa;	435	struct sockaddr_in sa;
211	socklen_t sa_len = sizeof (sa);	436	socklen_t sa_len = sizeof (sa);
212	int len;	437	int len;
213		438
214	len = recvfrom (udpv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	439	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
215		440
216	sockinfo si(sa);	441	sockinfo si(sa, PROT_IPv4);
217		442
218	if (len > 0)	443	if (len > 0)
219	{	444	{
220	pkt->len = len;	445	pkt->len = len;
		446
		447	// raw sockets deliver the ipv4, but don't expect it on sends
		448	// this is slow, but...
		449	pkt->skip_hdr (IP_OVERHEAD);
221		450
222	recv_vpn_packet (pkt, si);	451	recv_vpn_packet (pkt, si);
223	}	452	}
224	else	453	else
225	{	454	{
226	// probably ECONNRESET or somesuch	455	// probably ECONNRESET or somesuch
227	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
228	}	457	}
229		458
230	delete pkt;	459	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	}	460	}
238	else	461	else
239	{	462	{
240	slog (L_ERR,	463	slog (L_ERR,
241	_("FATAL: unknown revents %08x in socket, terminating\n"),	464	_("FATAL: unknown revents %08x in socket, terminating\n"),
242	revents);	465	revents);
243	exit (1);	466	exit (EXIT_FAILURE);
244	}	467	}
245	}	468	}
246		469
		470	#if ENABLE_ICMP
247	void	471	void
248	vpn::ipv4_ev (short revents)	472	vpn::icmpv4_ev (io_watcher &w, short revents)
249	{	473	{
250	if (revents & (POLLIN \| POLLERR))	474	if (revents & EVENT_READ)
251	{	475	{
252	vpn_packet *pkt = new vpn_packet;	476	vpn_packet *pkt = new vpn_packet;
253	struct sockaddr_in sa;	477	struct sockaddr_in sa;
254	socklen_t sa_len = sizeof (sa);	478	socklen_t sa_len = sizeof (sa);
255	int len;	479	int len;
256		480
257	len = recvfrom (ipv4_fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	481	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
258		482
259	sockinfo si(sa, PROT_IPv4);	483	sockinfo si(sa, PROT_ICMPv4);
260		484
261	if (len > 0)	485	if (len > 0)
262	{	486	{
263	pkt->len = len;	487	pkt->len = len;
264		488
		489	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		490
		491	if (hdr->type == ::conf.icmp_type
		492	&& hdr->code == 255)
		493	{
265	// raw sockets deliver the ipv4, but don't expect it on sends	494	// raw sockets deliver the ipv4, but don't expect it on sends
266	// this is slow, but...	495	// this is slow, but...
267	pkt->skip_hdr (IP_OVERHEAD);	496	pkt->skip_hdr (ICMP_OVERHEAD);
268		497
269	recv_vpn_packet (pkt, si);	498	recv_vpn_packet (pkt, si);
		499	}
270	}	500	}
271	else	501	else
272	{	502	{
273	// probably ECONNRESET or somesuch	503	// probably ECONNRESET or somesuch
274	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
275	}	505	}
276		506
277	delete pkt;	507	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	}	508	}
285	else	509	else
286	{	510	{
287	slog (L_ERR,	511	slog (L_ERR,
288	_("FATAL: unknown revents %08x in socket, terminating\n"),	512	_("FATAL: unknown revents %08x in socket, terminating\n"),
289	revents);	513	revents);
290	exit (1);	514	exit (EXIT_FAILURE);
		515	}
		516	}
		517	#endif
		518
		519	void
		520	vpn::udpv4_ev (io_watcher &w, short revents)
		521	{
		522	if (revents & EVENT_READ)
291	}	523	{
292	}	524	vpn_packet *pkt = new vpn_packet;
		525	struct sockaddr_in sa;
		526	socklen_t sa_len = sizeof (sa);
		527	int len;
293		528
		529	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		530
		531	sockinfo si(sa, PROT_UDPv4);
		532
		533	if (len > 0)
		534	{
		535	pkt->len = len;
		536
		537	recv_vpn_packet (pkt, si);
		538	}
		539	else
		540	{
		541	// probably ECONNRESET or somesuch
		542	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		543	}
		544
		545	delete pkt;
		546	}
		547	else
		548	{
		549	slog (L_ERR,
		550	_("FATAL: unknown revents %08x in socket, terminating\n"),
		551	revents);
		552	exit (EXIT_FAILURE);
		553	}
		554	}
		555
294	void	556	void
295	vpn::tap_ev (short revents)	557	vpn::tap_ev (io_watcher &w, short revents)
296	{	558	{
297	if (revents & POLLIN)	559	if (revents & EVENT_READ)
298	{	560	{
299	/* process data */	561	/* process data */
300	tap_packet *pkt;	562	tap_packet *pkt;
301		563
302	pkt = tap->recv ();	564	pkt = tap->recv ();
303		565
		566	if (!pkt)
		567	return;
		568
		569	if (pkt->len > 14)
		570	{
304	int dst = mac2id (pkt->dst);	571	int dst = mac2id (pkt->dst);
305	int src = mac2id (pkt->src);	572	int src = mac2id (pkt->src);
306		573
307	if (src != THISNODE->id)	574	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	{	575	{
325	// unicast	576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
326	if (dst != THISNODE->id)	577	exit (EXIT_FAILURE);
327	conns[dst - 1]->inject_data_packet (pkt);
328	}	578	}
		579
		580	if (dst == THISNODE->id)
		581	{
		582	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		583	exit (EXIT_FAILURE);
		584	}
		585
		586	if (dst > conns.size ())
		587	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
329	else	588	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);	589	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	}	590	}
342		591
343	delete pkt;	592	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	}	593	}
350	else	594	else
351	abort ();	595	abort ();
352	}	596	}
353		597
354	void	598	void
355	vpn::event_cb (tstamp &ts)	599	vpn::event_cb (time_watcher &w)
356	{	600	{
357	if (events)	601	if (events)
358	{	602	{
359	if (events & EVENT_SHUTDOWN)	603	if (events & EVENT_SHUTDOWN)
360	{	604	{
361	slog (L_INFO, _("preparing shutdown..."));	605	slog (L_INFO, _("preparing shutdown..."));
362		606
363	shutdown_all ();	607	shutdown_all ();
364
365	remove_pid (pidfilename);	608	remove_pid (conf.pidfilename);
366
367	slog (L_INFO, _("terminating"));	609	slog (L_INFO, _("terminating"));
368		610	exit (EXIT_SUCCESS);
369	exit (0);
370	}	611	}
371		612
372	if (events & EVENT_RECONNECT)	613	if (events & EVENT_RECONNECT)
373	{	614	{
374	slog (L_INFO, _("forced reconnect"));	615	slog (L_INFO, _("forced reconnect"));
…		…
376	reconnect_all ();	617	reconnect_all ();
377	}	618	}
378		619
379	events = 0;	620	events = 0;
380	}	621	}
381
382	ts = TSTAMP_CANCEL;
383	}	622	}
384		623
385	void	624	void
386	vpn::shutdown_all ()	625	vpn::shutdown_all ()
387	{	626	{
…		…
419	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
420	{	659	{
421	connection c = i;	660	connection c = i;
422		661
423	if (c->conf->routerprio > prio	662	if (c->conf->routerprio > prio
424	&& c->connectmode == conf_node::C_ALWAYS	663	&& 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)	664	&& c->ictx && c->octx
		665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
427	{	666	{
428	prio = c->conf->routerprio;	667	prio = c->conf->routerprio;
429	router = c;	668	router = c;
430	}	669	}
431	}	670	}
432		671
433	return router;	672	return router;
434	}	673	}
435		674
436	void vpn::connect_request (int id)	675	void vpn::send_connect_request (int id)
437	{	676	{
438	connection *c = find_router ();	677	connection *c = find_router ();
439		678
440	if (c)	679	if (c)
441	c->connect_request (id);	680	c->send_connect_request (id);
442	//else // does not work, because all others must connect to the same router	681	else
443	// // no router found, aggressively connect to all routers	682	// no router found, aggressively connect to all routers
444	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
445	// if ((*i)->conf->routerprio)	684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
446	// (*i)->establish_connection ();	685	(*i)->establish_connection ();
447	}	686	}
448		687
449	void	688	void
450	connection::dump_status ()	689	connection::dump_status ()
451	{	690	{
…		…
468		707
469	slog (L_NOTICE, _("END status dump"));	708	slog (L_NOTICE, _("END status dump"));
470	}	709	}
471		710
472	vpn::vpn (void)	711	vpn::vpn (void)
		712	: event (this, &vpn::event_cb)
473	: udpv4_ev_watcher(this, &vpn::udpv4_ev)	713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
474	, ipv4_ev_watcher(this, &vpn::ipv4_ev)	714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
		715	#if ENABLE_TCP
		716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
		717	#endif
		718	#if ENABLE_ICMP
		719	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		720	#endif
		721	#if ENABLE_DNS
		722	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		723	#endif
475	, tap_ev_watcher(this, &vpn::tap_ev)	724	, tap_ev_watcher (this, &vpn::tap_ev)
476	, event(this, &vpn::event_cb)
477	{	725	{
478	}	726	}
479		727
480	vpn::~vpn ()	728	vpn::~vpn ()
481	{	729	{

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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 1.25 by pcg, Sun Jul 25 18:11:40 2004 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 1.25 by pcg, Sun Jul 25 18:11:40 2004 UTC