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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 05:15:00 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"
42		44
43	#if ENABLE_TCP	45	vpn network; // THE vpn (bad design...)
44	# include <map>
45	# include <unistd.h>
46	# include <fcntl.h>
47	# include <sys/poll.h>
48	#endif
49		46
50	/////////////////////////////////////////////////////////////////////////////	47	/////////////////////////////////////////////////////////////////////////////
51		48
52	const char *vpn::script_if_up ()	49	const char *vpn::script_if_up ()
53	{	50	{
…		…
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	54	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	55	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	56	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		57
61	char *env;	58	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	59	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	60	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);	61	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	62	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	63	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		64	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	65	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	66	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	67	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);	68	THISNODE->id & 0xff);
75	putenv (env);	69	putenv (env);
76		70
…		…
78	}	72	}
79		73
80	int	74	int
81	vpn::setup ()	75	vpn::setup ()
82	{	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
83	udpv4_fd = -1;	109	udpv4_fd = -1;
84		110
85	if (THISNODE->protocols & PROT_UDPv4)	111	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	112	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	113	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		114
89	if (udpv4_fd < 0)	115	if (udpv4_fd < 0)
90	return -1;	116	return -1;
91		117
92	sockinfo si (THISNODE, PROT_UDPv4);	118	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
93		119
94	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	120	// standard daemon practise...
95	{	121	{
96	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	122	int oval = 1;
97	exit (1);	123	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98	}	124	}
99		125
100	#ifdef IP_MTU_DISCOVER	126	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101	// this I really consider a linux bug. I am neither connected	127	// this I really consider a linux bug. I am neither connected
102	// 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
103	// fragment for me sometimes.	129	// fragment for me sometimes.
104	{	130	{
105	int oval = IP_PMTUDISC_DONT;	131	int oval = IP_PMTUDISC_DONT;
106	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	132	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107	}	133	}
108	#endif	134	#endif
109		135
110	// 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
111	{	160	{
112	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
113	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	166	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114	}	167	}
		168	#endif
115		169
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	170	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
117	}
118
119	ipv4_fd = -1;
120	if (THISNODE->protocols & PROT_IPv4)
121	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
123
124	if (ipv4_fd < 0)
125	return -1;
126
127	sockinfo si (THISNODE, PROT_IPv4);
128
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
130	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
132	exit (1);
133	}
134
135	#ifdef IP_MTU_DISCOVER
136	// this I really consider a linux bug. I am neither connected	171	// this I really consider a linux bug. I am neither connected
137	// 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
138	// fragment for me sometimes.	173	// fragment for me sometimes.
139	{	174	{
140	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	177	}
143	#endif	178	#endif
144		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
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	188	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	189	}
		190	#endif
		191
		192	tcpv4_fd = -1;
147		193
148	#if ENABLE_TCP	194	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	195	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	196	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	197	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		198
153	if (tcpv4_fd < 0)	199	if (tcpv4_fd < 0)
154	return -1;	200	return -1;
155		201
156	sockinfo si (THISNODE, PROT_TCPv4);	202	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
157
158	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
159	{
160	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
161	exit (1);
162	}
163
164	if (listen (tcpv4_fd, 5))
165	{
166	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);
168	}
169		203
170	// standard daemon practise...	204	// standard daemon practise...
171	{	205	{
172	int oval = 1;	206	int oval = 1;
173	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	207	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174	}	208	}
175		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
176	tcpv4_accept_watcher.start (tcpv4_fd, POLLIN);	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);
177	}	251	}
178	#endif	252	#endif
179		253
180	tap = new tap_device ();	254	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	255	if (!tap) //D this, of course, never catches
182	{	256	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	257	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	258	exit (EXIT_FAILURE);
185	}	259	}
186		260
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	261	run_script (run_script_cb (this, &vpn::script_if_up), true);
188		262
189	tap_ev_watcher.start (tap->fd, POLLIN);	263	tap_ev_watcher.start (tap->fd, EVENT_READ);
190		264
191	reconnect_all ();	265	reconnect_all ();
192		266
193	return 0;	267	return 0;
194	}	268	}
195		269
196	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
197	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)
198	{	305	{
		306	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	307	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		308	#endif
200	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 ());
201	}
202		310
203	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
204	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)
205	{	361	{
		362	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	363	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		364	#endif
207	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	}
208	}	387	}
209		388
210	void	389	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	390	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	391	{
…		…
219	if (src == 0 \|\| src > conns.size ()	398	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	399	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	400	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	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)"),
223	(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 ());
224	else	406	else
225	{	407	{
226	connection *c = conns[src - 1];	408	connection *c = conns[src - 1];
227		409
228	if (dst == 0 && !THISNODE->routerprio)	410	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	411	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	412	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	413	else if (dst != THISNODE->id)
232	// 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
233	slog (L_WARN,	419	slog (L_WARN,
234	_("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,
235	dst, conns[dst - 1]->conf->nodename,	422	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	423	}
237	THISNODE->id, THISNODE->nodename);
238	else	424	else
239	c->recv_vpn_packet (pkt, rsi);	425	c->recv_vpn_packet (pkt, rsi);
240	}	426	}
241	}	427	}
242		428
243	void	429	void
244	vpn::udpv4_ev (int fd, short revents)	430	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	431	{
246	if (revents & (POLLIN \| POLLERR))	432	if (revents & EVENT_READ)
247	{	433	{
248	vpn_packet *pkt = new vpn_packet;	434	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	435	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	436	socklen_t sa_len = sizeof (sa);
251	int len;	437	int len;
252		438
253	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	439	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		440
255	sockinfo si(sa);	441	sockinfo si(sa, PROT_IPv4);
256		442
257	if (len > 0)	443	if (len > 0)
258	{	444	{
259	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);
260		450
261	recv_vpn_packet (pkt, si);	451	recv_vpn_packet (pkt, si);
262	}	452	}
263	else	453	else
264	{	454	{
265	// probably ECONNRESET or somesuch	455	// probably ECONNRESET or somesuch
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	456	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	457	}
268		458
269	delete pkt;	459	delete pkt;
270	}
271	else if (revents & POLLHUP)
272	{
273	// this cannot ;) happen on udp sockets
274	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
275	exit (1);
276	}	460	}
277	else	461	else
278	{	462	{
279	slog (L_ERR,	463	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	464	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	465	revents);
282	exit (1);	466	exit (EXIT_FAILURE);
283	}	467	}
284	}	468	}
285		469
		470	#if ENABLE_ICMP
286	void	471	void
287	vpn::ipv4_ev (int fd, short revents)	472	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	473	{
289	if (revents & (POLLIN \| POLLERR))	474	if (revents & EVENT_READ)
290	{	475	{
291	vpn_packet *pkt = new vpn_packet;	476	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	477	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	478	socklen_t sa_len = sizeof (sa);
294	int len;	479	int len;
295		480
296	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	481	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		482
298	sockinfo si(sa, PROT_IPv4);	483	sockinfo si(sa, PROT_ICMPv4);
299		484
300	if (len > 0)	485	if (len > 0)
301	{	486	{
302	pkt->len = len;	487	pkt->len = len;
303		488
		489	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		490
		491	if (hdr->type == ::conf.icmp_type
		492	&& hdr->code == 255)
		493	{
304	// 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
305	// this is slow, but...	495	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	496	pkt->skip_hdr (ICMP_OVERHEAD);
307		497
308	recv_vpn_packet (pkt, si);	498	recv_vpn_packet (pkt, si);
		499	}
309	}	500	}
310	else	501	else
311	{	502	{
312	// probably ECONNRESET or somesuch	503	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	504	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	505	}
315		506
316	delete pkt;	507	delete pkt;
317	}
318	else if (revents & POLLHUP)
319	{
320	// this cannot ;) happen on udp sockets
321	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
322	exit (1);
323	}	508	}
324	else	509	else
325	{	510	{
326	slog (L_ERR,	511	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	512	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	513	revents);
329	exit (1);	514	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_info {
336	int fd;
337	bool ok;
338	io_watcher r;
339
340	tcp_info (vpn *v)
341	: r(v, &vpn::tcpv4_ev)
342	{	515	}
343	fd = -1;	516	}
		517	#endif
		518
		519	void
		520	vpn::udpv4_ev (io_watcher &w, short revents)
		521	{
		522	if (revents & EVENT_READ)
344	}	523	{
345		524	vpn_packet *pkt = new vpn_packet;
346	~tcp_info () { close (fd); }
347	};
348
349	typedef map<sockinfo, tcp_info *> tcp_si_map;
350	typedef map<int, tcp_info *> tcp_fd_map; // unneecssary if iom would be cooler
351	static tcp_si_map tcp_si;
352	static tcp_fd_map tcp_fd;
353
354	void
355	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
356	{
357	tcp_si_map::iterator info = tcp_si.find (si);
358
359	if (info == tcp_si.end ())
360	{
361	// woaw, the first lost packet ;)
362	tcp_info *i = new tcp_info (this);
363
364	i->ok = false;
365	i->fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
366
367	if (i->fd >= 0)
368	{
369	fcntl (i->fd, F_SETFL, O_NONBLOCK);
370
371	if (connect (i->fd, si.sav4 (), si.salenv4 ()) >= 0
372	\|\| errno == EINPROGRESS)
373	{
374	tcp_si.insert (tcp_si_map::value_type (si, i));
375	tcp_fd.insert (tcp_fd_map::value_type (i->fd, i));
376	return;
377	}
378
379	delete i;
380	}
381	}
382	else
383	{
384	tcp_info *i = info->second;
385
386	if (i->ok)
387	{
388	setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
389
390	if (write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32))
391	{
392	// error, close socket, forget it and retry immediately
393	tcp_si.erase (info);
394	tcp_fd.erase (i->fd);
395	delete i;
396
397	// tail recursion is... better than goto(?)
398	send_tcpv4_packet (pkt, si, tos);
399	}
400	}
401	}
402
403	#if 0
404	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
405	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
406	#endif
407	}
408
409	void
410	vpn::tcpv4_accept (int fd, short revents)
411	{
412	if (revents & (POLLIN \| POLLERR))
413	{
414	struct sockaddr_in sa;	525	struct sockaddr_in sa;
415	socklen_t sa_len = sizeof (sa);	526	socklen_t sa_len = sizeof (sa);
416	int len;	527	int len;
417		528
418	fd = accept (fd, (sockaddr *)&sa, &sa_len);	529	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
419		530
420	if (fd >= 0)
421	{
422	fcntl (fd, F_SETFL, O_NONBLOCK);
423
424	sockinfo si(sa, PROT_TCPv4);	531	sockinfo si(sa, PROT_UDPv4);
425	tcp_info *i = new tcp_info (this);
426		532
427	i->fd = fd;	533	if (len > 0)
428	i->ok = true;
429	i->r.start (fd, POLLIN);
430
431	tcp_si.insert (tcp_si_map::value_type (si, i));
432	tcp_fd.insert (tcp_fd_map::value_type (fd, i));
433	}	534	{
434	}	535	pkt->len = len;
435	}
436		536
437	void	537	recv_vpn_packet (pkt, si);
438	vpn::tcpv4_ev (int fd, short revents)
439	{
440	if (revents & (POLLIN \| POLLERR))
441	{
442	tcp_fd_map::iterator info = tcp_fd.find (fd);
443
444	if (info != tcp_fd.end ())
445	{	538	}
446	tcp_info *i = info->second;	539	else
447
448	if (!i->ok) // not yet established
449	{
450	i->ok = true;
451	fcntl (i->fd, F_SETFL, 0);
452	}
453
454	u32 len;
455
456	if (sizeof (len) == read (fd, &len, sizeof (len)))
457	{
458	slog (L_ERR, "%d bytes received\n", len);
459	}
460
461	//tcp_si.erase (i);
462	tcp_fd.erase (fd);
463	delete i;
464	}	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
465	}	548	{
		549	slog (L_ERR,
		550	_("FATAL: unknown revents %08x in socket, terminating\n"),
		551	revents);
		552	exit (EXIT_FAILURE);
		553	}
466	}	554	}
467		555
468	#endif
469
470	void	556	void
471	vpn::tap_ev (int fd, short revents)	557	vpn::tap_ev (io_watcher &w, short revents)
472	{	558	{
473	if (revents & POLLIN)	559	if (revents & EVENT_READ)
474	{	560	{
475	/* process data */	561	/* process data */
476	tap_packet *pkt;	562	tap_packet *pkt;
477		563
478	pkt = tap->recv ();	564	pkt = tap->recv ();
479		565
		566	if (!pkt)
		567	return;
		568
		569	if (pkt->len > 14)
		570	{
480	int dst = mac2id (pkt->dst);	571	int dst = mac2id (pkt->dst);
481	int src = mac2id (pkt->src);	572	int src = mac2id (pkt->src);
482		573
483	if (src != THISNODE->id)	574	if (src != THISNODE->id)
484	{
485	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
486	exit (1);
487	}
488
489	if (dst == THISNODE->id)
490	{
491	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
492	exit (1);
493	}
494
495	if (dst > conns.size ())
496	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
497	else
498	{
499	if (dst)
500	{	575	{
501	// unicast	576	slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
502	if (dst != THISNODE->id)	577	exit (EXIT_FAILURE);
503	conns[dst - 1]->inject_data_packet (pkt);
504	}	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);
505	else	588	else
506	{
507	// broadcast, first check router, then self, then english
508	connection *router = find_router ();
509
510	if (router)
511	router->inject_data_packet (pkt, true);	589	inject_data_packet (pkt, dst);
512	else
513	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
514	if ((*c)->conf != THISNODE)
515	(*c)->inject_data_packet (pkt);
516	}
517	}	590	}
518		591
519	delete pkt;	592	delete pkt;
520	}
521	else if (revents & (POLLHUP \| POLLERR))
522	{
523	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
524	exit (1);
525	}	593	}
526	else	594	else
527	abort ();	595	abort ();
528	}	596	}
529		597
530	void	598	void
531	vpn::event_cb (tstamp &ts)	599	vpn::event_cb (time_watcher &w)
532	{	600	{
533	if (events)	601	if (events)
534	{	602	{
535	if (events & EVENT_SHUTDOWN)	603	if (events & EVENT_SHUTDOWN)
536	{	604	{
537	slog (L_INFO, _("preparing shutdown..."));	605	slog (L_INFO, _("preparing shutdown..."));
538		606
539	shutdown_all ();	607	shutdown_all ();
540
541	remove_pid (pidfilename);	608	remove_pid (conf.pidfilename);
542
543	slog (L_INFO, _("terminating"));	609	slog (L_INFO, _("terminating"));
544		610	exit (EXIT_SUCCESS);
545	exit (0);
546	}	611	}
547		612
548	if (events & EVENT_RECONNECT)	613	if (events & EVENT_RECONNECT)
549	{	614	{
550	slog (L_INFO, _("forced reconnect"));	615	slog (L_INFO, _("forced reconnect"));
…		…
552	reconnect_all ();	617	reconnect_all ();
553	}	618	}
554		619
555	events = 0;	620	events = 0;
556	}	621	}
557
558	ts = TSTAMP_CANCEL;
559	}	622	}
560		623
561	void	624	void
562	vpn::shutdown_all ()	625	vpn::shutdown_all ()
563	{	626	{
…		…
587	}	650	}
588	}	651	}
589		652
590	connection *vpn::find_router ()	653	connection *vpn::find_router ()
591	{	654	{
592	u32 prio = 0;	655	u32 prio = 1;
593	connection *router = 0;	656	connection *router = 0;
594		657
595	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	658	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596	{	659	{
597	connection c = i;	660	connection c = i;
598		661
599	if (c->conf->routerprio > prio	662	if (c->conf->routerprio > prio
600	&& c->connectmode == conf_node::C_ALWAYS	663	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
601	&& c->conf != THISNODE
602	&& c->ictx && c->octx)	664	&& c->ictx && c->octx
		665	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603	{	666	{
604	prio = c->conf->routerprio;	667	prio = c->conf->routerprio;
605	router = c;	668	router = c;
606	}	669	}
607	}	670	}
608		671
609	return router;	672	return router;
610	}	673	}
611		674
612	void vpn::connect_request (int id)	675	void vpn::send_connect_request (int id)
613	{	676	{
614	connection *c = find_router ();	677	connection *c = find_router ();
615		678
616	if (c)	679	if (c)
617	c->connect_request (id);	680	c->send_connect_request (id);
618	//else // does not work, because all others must connect to the same router	681	else
619	// // no router found, aggressively connect to all routers	682	// no router found, aggressively connect to all routers
620	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	683	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621	// if ((*i)->conf->routerprio)	684	if ((i)->conf->routerprio && (i)->conf != THISNODE)
622	// (*i)->establish_connection ();	685	(*i)->establish_connection ();
623	}	686	}
624		687
625	void	688	void
626	connection::dump_status ()	689	connection::dump_status ()
627	{	690	{
…		…
644		707
645	slog (L_NOTICE, _("END status dump"));	708	slog (L_NOTICE, _("END status dump"));
646	}	709	}
647		710
648	vpn::vpn (void)	711	vpn::vpn (void)
649	: event(this, &vpn::event_cb)	712	: event (this, &vpn::event_cb)
650	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	713	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	714	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652	, tap_ev_watcher (this, &vpn::tap_ev)
653	#if ENABLE_TCP	715	#if ENABLE_TCP
654	, tcpv4_accept_watcher(this, &vpn::tcpv4_accept)	716	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655	#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)
656	{	725	{
657	}	726	}
658		727
659	vpn::~vpn ()	728	vpn::~vpn ()
660	{	729	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.2 by pcg, Wed Apr 2 05:15:00 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 1.2 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC