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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.24 by pcg, Fri Apr 2 14:42:45 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"
		44
		45	vpn network; // THE vpn (bad design...)
42		46
43	/////////////////////////////////////////////////////////////////////////////	47	/////////////////////////////////////////////////////////////////////////////
44		48
45	const char *vpn::script_if_up ()	49	const char *vpn::script_if_up ()
46	{	50	{
…		…
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	{
		77	ipv4_fd = -1;
		78
		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	}
		108
76	udpv4_fd = -1;	109	udpv4_fd = -1;
77		110
78	if (THISNODE->protocols & PROT_UDPv4)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
79	{	112	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
81		114
82	if (udpv4_fd < 0)	115	if (udpv4_fd < 0)
83	return -1;	116	return -1;
		117
		118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
84		119
85	// standard daemon practise...	120	// standard daemon practise...
86	{	121	{
87	int oval = 1;	122	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}	124	}
90		125
91	sockinfo si (THISNODE, PROT_UDPv4);	126	#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	127	// this I really consider a linux bug. I am neither connected
101	// 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
102	// fragment for me sometimes.	129	// fragment for me sometimes.
103	{	130	{
104	int oval = IP_PMTUDISC_DONT;	131	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	132	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
106	}	133	}
107	#endif	134	#endif
108		135
		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
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	144	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
110	}	145	}
111		146
112	ipv4_fd = -1;	147	icmpv4_fd = -1;
		148
		149	#if ENABLE_ICMP
113	if (THISNODE->protocols & PROT_IPv4)	150	if (THISNODE->protocols & PROT_ICMPv4)
114	{	151	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	152	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
116		153
117	if (ipv4_fd < 0)	154	if (icmpv4_fd < 0)
118	return -1;	155	return -1;
119		156
120	sockinfo si (THISNODE, PROT_IPv4);	157	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
121		158
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	159	#ifdef ICMP_FILTER
123	{	160	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	161	icmp_filter oval;
125	exit (1);	162	oval.data = 0xffffffff;
		163	if (::conf.icmp_type < 32)
		164	oval.data &= ~(1 << ::conf.icmp_type);
		165
		166	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
126	}	167	}
		168	#endif
127		169
128	#ifdef IP_MTU_DISCOVER	170	#if defined(SOL_IP) && defined(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);
139	}	189	}
		190	#endif
		191
		192	tcpv4_fd = -1;
140		193
141	#if ENABLE_TCP	194	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	196	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		198
146	if (tcpv4_fd < 0)	199	if (tcpv4_fd < 0)
147	return -1;	200	return -1;
		201
		202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
148		203
149	// standard daemon practise...	204	// standard daemon practise...
150	{	205	{
151	int oval = 1;	206	int oval = 1;
152	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
155	sockinfo si (THISNODE, PROT_TCPv4);	210	sockinfo si (THISNODE, PROT_TCPv4);
156		211
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	212	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	213	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	214	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160	exit (1);	215	exit (EXIT_FAILURE);
161	}	216	}
162		217
163	if (listen (tcpv4_fd, 5))	218	if (listen (tcpv4_fd, 5))
164	{	219	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	220	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166	exit (1);	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 ()))
167	}	245	{
		246	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		247	exit (EXIT_FAILURE);
		248	}
168		249
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	250	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
170	}	251	}
171	#endif	252	#endif
172		253
173	tap = new tap_device ();	254	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
175	{	256	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
177	exit (1);	258	exit (EXIT_FAILURE);
178	}	259	}
179		260
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
181		262
182	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
183		264
184	reconnect_all ();	265	reconnect_all ();
185		266
186	return 0;	267	return 0;
187	}	268	}
…		…
201	#if ENABLE_TCP	282	#if ENABLE_TCP
202	case PROT_TCPv4:	283	case PROT_TCPv4:
203	return send_tcpv4_packet (pkt, si, tos);	284	return send_tcpv4_packet (pkt, si, tos);
204	#endif	285	#endif
205		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
206	default:	297	default:
207	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);	298	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
208	return false;	299	return false;
209	}	300	}
210	}	301	}
211		302
212	bool	303	bool
213	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)
214	{	305	{
		306	#if defined(SOL_IP) && defined(IP_TOS)
215	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	307	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		308	#endif
216	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 ());
217		310
218	return true;	311	return true;
219	}	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
220		358
221	bool	359	bool
222	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)
223	{	361	{
		362	#if defined(SOL_IP) && defined(IP_TOS)
224	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		364	#endif
225	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 ());
226		366
227	return true;	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	}
228	}	387	}
229		388
230	void	389	void
231	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
232	{	391	{
…		…
246	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	405	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247	else	406	else
248	{	407	{
249	connection *c = conns[src - 1];	408	connection *c = conns[src - 1];
250		409
251	if (dst == 0 && !THISNODE->routerprio)	410	if (dst == 0)
252	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
253	c->conf->nodename, (const char *)rsi);	412	c->conf->nodename, (const char *)rsi);
254	else if (dst != 0 && dst != THISNODE->id)	413	else if (dst != THISNODE->id)
255	{	414	{
256	if (THISNODE->routerprio)	415	if (THISNODE->routerprio)
257	// the tos setting gets lost here. who cares.	416	// the tos setting gets lost here. who cares.
258	conns[dst - 1]->inject_vpn_packet (pkt);	417	conns[dst - 1]->inject_vpn_packet (pkt);
259	else	418	else
…		…
266	c->recv_vpn_packet (pkt, rsi);	425	c->recv_vpn_packet (pkt, rsi);
267	}	426	}
268	}	427	}
269		428
270	void	429	void
271	vpn::udpv4_ev (io_watcher &w, short revents)	430	vpn::ipv4_ev (io_watcher &w, short revents)
272	{	431	{
273	if (revents & (POLLIN \| POLLERR))	432	if (revents & EVENT_READ)
274	{	433	{
275	vpn_packet *pkt = new vpn_packet;	434	vpn_packet *pkt = new vpn_packet;
276	struct sockaddr_in sa;	435	struct sockaddr_in sa;
277	socklen_t sa_len = sizeof (sa);	436	socklen_t sa_len = sizeof (sa);
278	int len;	437	int len;
279		438
280	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	439	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
281		440
282	sockinfo si(sa, PROT_UDPv4);	441	sockinfo si(sa, PROT_IPv4);
283		442
284	if (len > 0)	443	if (len > 0)
285	{	444	{
286	pkt->len = len;	445	pkt->len = len;
287		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);
		450
288	recv_vpn_packet (pkt, si);	451	recv_vpn_packet (pkt, si);
289	}	452	}
290	else	453	else
291	{	454	{
292	// probably ECONNRESET or somesuch	455	// probably ECONNRESET or somesuch
293	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
294	}	457	}
295		458
296	delete pkt;	459	delete pkt;
297	}
298	else if (revents & POLLHUP)
299	{
300	// this cannot ;) happen on udp sockets
301	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
302	exit (1);
303	}	460	}
304	else	461	else
305	{	462	{
306	slog (L_ERR,	463	slog (L_ERR,
307	_("FATAL: unknown revents %08x in socket, terminating\n"),	464	_("FATAL: unknown revents %08x in socket, terminating\n"),
308	revents);	465	revents);
309	exit (1);	466	exit (EXIT_FAILURE);
310	}	467	}
311	}	468	}
312		469
		470	#if ENABLE_ICMP
313	void	471	void
314	vpn::ipv4_ev (io_watcher &w, short revents)	472	vpn::icmpv4_ev (io_watcher &w, short revents)
315	{	473	{
316	if (revents & (POLLIN \| POLLERR))	474	if (revents & EVENT_READ)
317	{	475	{
318	vpn_packet *pkt = new vpn_packet;	476	vpn_packet *pkt = new vpn_packet;
319	struct sockaddr_in sa;	477	struct sockaddr_in sa;
320	socklen_t sa_len = sizeof (sa);	478	socklen_t sa_len = sizeof (sa);
321	int len;	479	int len;
322		480
323	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	481	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
324		482
325	sockinfo si(sa, PROT_IPv4);	483	sockinfo si(sa, PROT_ICMPv4);
326		484
327	if (len > 0)	485	if (len > 0)
328	{	486	{
329	pkt->len = len;	487	pkt->len = len;
330		488
		489	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		490
		491	if (hdr->type == ::conf.icmp_type
		492	&& hdr->code == 255)
		493	{
331	// 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
332	// this is slow, but...	495	// this is slow, but...
333	pkt->skip_hdr (IP_OVERHEAD);	496	pkt->skip_hdr (ICMP_OVERHEAD);
334		497
335	recv_vpn_packet (pkt, si);	498	recv_vpn_packet (pkt, si);
		499	}
336	}	500	}
337	else	501	else
338	{	502	{
339	// probably ECONNRESET or somesuch	503	// probably ECONNRESET or somesuch
340	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
341	}	505	}
342		506
343	delete pkt;	507	delete pkt;
344	}
345	else if (revents & POLLHUP)
346	{
347	// this cannot ;) happen on udp sockets
348	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
349	exit (1);
350	}	508	}
351	else	509	else
352	{	510	{
353	slog (L_ERR,	511	slog (L_ERR,
354	_("FATAL: unknown revents %08x in socket, terminating\n"),	512	_("FATAL: unknown revents %08x in socket, terminating\n"),
355	revents);	513	revents);
356	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)
		523	{
		524	vpn_packet *pkt = new vpn_packet;
		525	struct sockaddr_in sa;
		526	socklen_t sa_len = sizeof (sa);
		527	int len;
		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);
357	}	553	}
358	}	554	}
359		555
360	void	556	void
361	vpn::tap_ev (io_watcher &w, short revents)	557	vpn::tap_ev (io_watcher &w, short revents)
362	{	558	{
363	if (revents & POLLIN)	559	if (revents & EVENT_READ)
364	{	560	{
365	/* process data */	561	/* process data */
366	tap_packet *pkt;	562	tap_packet *pkt;
367		563
368	pkt = tap->recv ();	564	pkt = tap->recv ();
369		565
		566	if (!pkt)
		567	return;
		568
		569	if (pkt->len > 14)
		570	{
370	int dst = mac2id (pkt->dst);	571	int dst = mac2id (pkt->dst);
371	int src = mac2id (pkt->src);	572	int src = mac2id (pkt->src);
372		573
373	if (src != THISNODE->id)	574	if (src != THISNODE->id)
374	{
375	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
376	exit (1);
377	}
378
379	if (dst == THISNODE->id)
380	{
381	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
382	exit (1);
383	}
384
385	if (dst > conns.size ())
386	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
387	else
388	{
389	if (dst)
390	{	575	{
391	// unicast	576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
392	if (dst != THISNODE->id)	577	exit (EXIT_FAILURE);
393	conns[dst - 1]->inject_data_packet (pkt);
394	}	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);
395	else	588	else
396	{
397	// broadcast, first check router, then self, then english
398	connection *router = find_router ();
399
400	if (router)
401	router->inject_data_packet (pkt, true);	589	inject_data_packet (pkt, dst);
402	else
403	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
404	if ((*c)->conf != THISNODE)
405	(*c)->inject_data_packet (pkt);
406	}
407	}	590	}
408		591
409	delete pkt;	592	delete pkt;
410	}
411	else if (revents & (POLLHUP \| POLLERR))
412	{
413	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
414	exit (1);
415	}	593	}
416	else	594	else
417	abort ();	595	abort ();
418	}	596	}
419		597
…		…
425	if (events & EVENT_SHUTDOWN)	603	if (events & EVENT_SHUTDOWN)
426	{	604	{
427	slog (L_INFO, _("preparing shutdown..."));	605	slog (L_INFO, _("preparing shutdown..."));
428		606
429	shutdown_all ();	607	shutdown_all ();
430
431	remove_pid (pidfilename);	608	remove_pid (conf.pidfilename);
432
433	slog (L_INFO, _("terminating"));	609	slog (L_INFO, _("terminating"));
434		610	exit (EXIT_SUCCESS);
435	exit (0);
436	}	611	}
437		612
438	if (events & EVENT_RECONNECT)	613	if (events & EVENT_RECONNECT)
439	{	614	{
440	slog (L_INFO, _("forced reconnect"));	615	slog (L_INFO, _("forced reconnect"));
…		…
442	reconnect_all ();	617	reconnect_all ();
443	}	618	}
444		619
445	events = 0;	620	events = 0;
446	}	621	}
447
448	w.at = TSTAMP_CANCEL;
449	}	622	}
450		623
451	void	624	void
452	vpn::shutdown_all ()	625	vpn::shutdown_all ()
453	{	626	{
…		…
477	}	650	}
478	}	651	}
479		652
480	connection *vpn::find_router ()	653	connection *vpn::find_router ()
481	{	654	{
482	u32 prio = 0;	655	u32 prio = 1;
483	connection *router = 0;	656	connection *router = 0;
484		657
485	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
486	{	659	{
487	connection c = i;	660	connection c = i;
488		661
489	if (c->conf->routerprio > prio	662	if (c->conf->routerprio > prio
490	&& c->connectmode == conf_node::C_ALWAYS	663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
491	&& c->conf != THISNODE
492	&& c->ictx && c->octx)	664	&& c->ictx && c->octx
		665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
493	{	666	{
494	prio = c->conf->routerprio;	667	prio = c->conf->routerprio;
495	router = c;	668	router = c;
496	}	669	}
497	}	670	}
…		…
506	if (c)	679	if (c)
507	c->send_connect_request (id);	680	c->send_connect_request (id);
508	else	681	else
509	// no router found, aggressively connect to all routers	682	// no router found, aggressively connect to all routers
510	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
511	if ((*i)->conf->routerprio)	684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
512	(*i)->establish_connection ();	685	(*i)->establish_connection ();
513	}	686	}
514		687
515	void	688	void
516	connection::dump_status ()	689	connection::dump_status ()
…		…
534		707
535	slog (L_NOTICE, _("END status dump"));	708	slog (L_NOTICE, _("END status dump"));
536	}	709	}
537		710
538	vpn::vpn (void)	711	vpn::vpn (void)
539	: event(this, &vpn::event_cb)	712	: event (this, &vpn::event_cb)
540	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
541	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
542	, tap_ev_watcher (this, &vpn::tap_ev)
543	#if ENABLE_TCP	715	#if ENABLE_TCP
544	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
545	#endif	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
		724	, tap_ev_watcher (this, &vpn::tap_ev)
546	{	725	{
547	}	726	}
548		727
549	vpn::~vpn ()	728	vpn::~vpn ()
550	{	729	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs. Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.7 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC