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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	33	#include <errno.h>
34	#include <time.h>	34	#include <time.h>
35	#include <unistd.h>	35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <sys/socket.h>
		38
		39	#include "netcompat.h"
36		40
37	#include "pidfile.h"	41	#include "pidfile.h"
38		42
39	#include "connection.h"	43	#include "connection.h"
40	#include "util.h"	44	#include "util.h"
41	#include "vpn.h"	45	#include "vpn.h"
42		46
43	#if ENABLE_TCP	47	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		48
50	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
51		50
52	const char *vpn::script_if_up ()	51	static void inline
		52	set_tos (int fd, int &tos_prev, int tos)
		53	{
		54	#if defined(SOL_IP) && defined(IP_TOS)
		55	if (tos_prev == tos)
		56	return;
		57
		58	tos_prev = tos;
		59	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		60	#endif
		61	}
		62
		63	void
		64	vpn::script_init_env ()
53	{	65	{
54	// the tunnel device mtu should be the physical mtu - overhead	66	// the tunnel device mtu should be the physical mtu - overhead
55	// the tricky part is rounding to the cipher key blocksize	67	// the tricky part is rounding to the cipher key blocksize
56	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	68	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	69	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	70	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	71	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		72
61	char *env;	73	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	74	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	75	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	76	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		77	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	78	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);	79	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	80	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);
75	putenv (env);
76		81
		82	conns [THISNODE->id - 1]->script_init_env ("");
		83
		84	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		85	{
		86	char ext[16];
		87	snprintf (ext, 16, "_%d", (*c)->conf->id);
		88	(*c)->script_init_env (ext);
		89	}
		90	}
		91
		92	const char *vpn::script_if_init ()
		93	{
		94	script_init_env ();
		95
		96	return tap->if_up ();
		97	}
		98
		99	const char *vpn::script_if_up ()
		100	{
		101	script_init_env ();
		102
		103	char *filename;
		104	asprintf (&filename,
		105	"%s/%s",
		106	confbase,
77	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	107	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		108
		109	return filename;
78	}	110	}
79		111
80	int	112	int
81	vpn::setup ()	113	vpn::setup ()
82	{	114	{
		115	ipv4_tos = -1;
		116	ipv4_fd = -1;
		117
		118	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		119	{
		120	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		121
		122	if (ipv4_fd < 0)
		123	return -1;
		124
		125	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		126	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		127
		128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		129	// this I really consider a linux bug. I am neither connected
		130	// nor do I fragment myself. Linux still sets DF and doesn't
		131	// fragment for me sometimes.
		132	{
		133	int oval = IP_PMTUDISC_DONT;
		134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		135	}
		136	#endif
		137
		138	sockinfo si (THISNODE, PROT_IPv4);
		139
		140	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
		146	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		147	}
		148
		149	udpv4_tos = -1;
83	udpv4_fd = -1;	150	udpv4_fd = -1;
84		151
85	if (THISNODE->protocols & PROT_UDPv4)	152	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	153	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	154	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		155
89	if (udpv4_fd < 0)	156	if (udpv4_fd < 0)
90	return -1;	157	return -1;
		158
		159	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		160	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
91		161
92	// standard daemon practise...	162	// standard daemon practise...
93	{	163	{
94	int oval = 1;	164	int oval = 1;
95	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	165	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96	}	166	}
97		167
98	sockinfo si (THISNODE, PROT_UDPv4);	168	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
99
100	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
101	{
102	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
103	exit (1);
104	}
105
106	#ifdef IP_MTU_DISCOVER
107	// this I really consider a linux bug. I am neither connected	169	// this I really consider a linux bug. I am neither connected
108	// nor do I fragment myself. Linux still sets DF and doesn't	170	// nor do I fragment myself. Linux still sets DF and doesn't
109	// fragment for me sometimes.	171	// fragment for me sometimes.
110	{	172	{
111	int oval = IP_PMTUDISC_DONT;	173	int oval = IP_PMTUDISC_DONT;
112	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	174	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113	}	175	}
114	#endif	176	#endif
115		177
		178	sockinfo si (THISNODE, PROT_UDPv4);
		179
		180	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		181	{
		182	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		183	exit (EXIT_FAILURE);
		184	}
		185
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	186	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
117	}	187	}
118		188
		189	icmpv4_tos = -1;
119	ipv4_fd = -1;	190	icmpv4_fd = -1;
		191
		192	#if ENABLE_ICMP
120	if (THISNODE->protocols & PROT_IPv4)	193	if (THISNODE->protocols & PROT_ICMPv4)
121	{	194	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	195	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123		196
124	if (ipv4_fd < 0)	197	if (icmpv4_fd < 0)
125	return -1;	198	return -1;
126		199
127	sockinfo si (THISNODE, PROT_IPv4);	200	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		201	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
128		202
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	203	#ifdef ICMP_FILTER
130	{	204	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	205	icmp_filter oval;
132	exit (1);	206	oval.data = 0xffffffff;
		207	if (::conf.icmp_type < 32)
		208	oval.data &= ~(1 << ::conf.icmp_type);
		209
		210	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133	}	211	}
		212	#endif
134		213
135	#ifdef IP_MTU_DISCOVER	214	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136	// this I really consider a linux bug. I am neither connected	215	// this I really consider a linux bug. I am neither connected
137	// nor do I fragment myself. Linux still sets DF and doesn't	216	// nor do I fragment myself. Linux still sets DF and doesn't
138	// fragment for me sometimes.	217	// fragment for me sometimes.
139	{	218	{
140	int oval = IP_PMTUDISC_DONT;	219	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	220	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	221	}
143	#endif	222	#endif
144		223
		224	sockinfo si (THISNODE, PROT_ICMPv4);
		225
		226	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		227	{
		228	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		229	exit (EXIT_FAILURE);
		230	}
		231
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	232	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
146	}	233	}
		234	#endif
		235
		236	tcpv4_fd = -1;
147		237
148	#if ENABLE_TCP	238	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	239	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	240	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	241	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		242
153	if (tcpv4_fd < 0)	243	if (tcpv4_fd < 0)
154	return -1;	244	return -1;
		245
		246	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		247	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
155		248
156	// standard daemon practise...	249	// standard daemon practise...
157	{	250	{
158	int oval = 1;	251	int oval = 1;
159	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	252	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
162	sockinfo si (THISNODE, PROT_TCPv4);	255	sockinfo si (THISNODE, PROT_TCPv4);
163		256
164	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	257	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
165	{	258	{
166	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	259	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);	260	exit (EXIT_FAILURE);
168	}	261	}
169		262
170	if (listen (tcpv4_fd, 5))	263	if (listen (tcpv4_fd, 5))
171	{	264	{
172	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	265	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
173	exit (1);	266	exit (EXIT_FAILURE);
		267	}
		268
		269	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		270	}
		271	#endif
		272
		273	dnsv4_tos = -1;
		274	dnsv4_fd = -1;
		275
		276	#if ENABLE_DNS
		277	if (THISNODE->protocols & PROT_DNSv4)
		278	{
		279	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		280
		281	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		282
		283	if (dnsv4_fd < 0)
		284	return -1;
		285
		286	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		287	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		288
		289	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		290	// this I really consider a linux bug. I am neither connected
		291	// nor do I fragment myself. Linux still sets DF and doesn't
		292	// fragment for me sometimes.
		293	{
		294	int oval = IP_PMTUDISC_DONT;
		295	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
174	}	296	}
175
176	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177	}
178	#endif	297	# endif
		298
		299	// standard daemon practise...
		300	{
		301	int oval = 1;
		302	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		303	}
		304
		305	sockinfo si (THISNODE->dns_hostname,
		306	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		307	PROT_DNSv4);
		308
		309	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		310	{
		311	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		312	exit (EXIT_FAILURE);
		313	}
		314
		315	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		316	}
		317	#endif
		318
		319	/////////////////////////////////////////////////////////////////////////////
		320
		321	reconnect_all ();
		322
		323	/////////////////////////////////////////////////////////////////////////////
179		324
180	tap = new tap_device ();	325	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	326	if (!tap) //D this, of course, never catches
182	{	327	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	328	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	329	exit (EXIT_FAILURE);
185	}	330	}
186		331
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	332	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
188		333
		334	run_script_cb cb;
		335
		336	callback_set (cb, this, vpn, script_if_init);
		337	if (tap->if_up () &&
		338	!run_script (cb, true))
		339	{
		340	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		341	tap->if_up ());
		342	exit (EXIT_FAILURE);
		343	}
		344
		345	callback_set (cb, this, vpn, script_if_up);
		346	if (!run_script (cb, true))
		347	{
		348	slog (L_ERR, _("if-up command execution failed, exiting."));
		349	exit (EXIT_FAILURE);
		350	}
		351
189	tap_ev_watcher.start (tap->fd, POLLIN);	352	tap_ev_watcher.start (tap->fd, EV_READ);
190
191	reconnect_all ();
192		353
193	return 0;	354	return 0;
194	}	355	}
195		356
196	void	357	bool
197	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	358	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198	{	359	{
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	360	set_tos (ipv4_fd, ipv4_tos, tos);
200	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	361	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201	}
202		362
203	void	363	return true;
		364	}
		365
		366	static u16
		367	ipv4_checksum (u16 *data, unsigned int len)
		368	{
		369	// use 32 bit accumulator and fold back carry bits at the end
		370	u32 sum = 0;
		371
		372	while (len > 1)
		373	{
		374	sum += *data++;
		375	len -= 2;
		376	}
		377
		378	// odd byte left?
		379	if (len)
		380	sum += (u8 )data;
		381
		382	// add back carry bits
		383	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		384	sum += (sum >> 16); // carry
		385
		386	return ~sum;
		387	}
		388
		389	#if ENABLE_ICMP
		390	bool
		391	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		392	{
		393	pkt->unshift_hdr (4);
		394
		395	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		396	hdr->type = ::conf.icmp_type;
		397	hdr->code = 255;
		398	hdr->checksum = 0;
		399	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		400
		401	set_tos (icmpv4_fd, icmpv4_tos, tos);
		402	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		403
		404	return true;
		405	}
		406	#endif
		407
		408	bool
204	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	409	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205	{	410	{
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	411	set_tos (udpv4_fd, udpv4_tos, tos);
207	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	412	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		413
		414	return true;
		415	}
		416
		417	void
		418	vpn::inject_data_packet (tap_packet *pkt, int dst)
		419	{
		420	if (dst)
		421	{
		422	// unicast
		423	if (dst != THISNODE->id)
		424	conns[dst - 1]->inject_data_packet (pkt);
		425	}
		426	else
		427	{
		428	// broadcast, this is ugly, but due to the security policy
		429	// we have to connect to all hosts...
		430	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		431	if ((*c)->conf != THISNODE)
		432	(*c)->inject_data_packet (pkt, true);
		433	}
208	}	434	}
209		435
210	void	436	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	437	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	438	{
…		…
219	if (src == 0 \|\| src > conns.size ()	445	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	446	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	447	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	448	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	449	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		450	else if (dst > conns.size ())
		451	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		452	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224	else	453	else
225	{	454	{
226	connection *c = conns[src - 1];	455	connection *c = conns[src - 1];
227		456
228	if (dst == 0 && !THISNODE->routerprio)	457	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	458	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	459	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	460	else if (dst != THISNODE->id)
232	// FORWARDING NEEDED ;)	461	{
		462	if (THISNODE->routerprio)
		463	// the tos setting gets lost here. who cares.
		464	conns[dst - 1]->inject_vpn_packet (pkt);
		465	else
233	slog (L_WARN,	466	slog (L_WARN,
234	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	467	_("%s(%s): forwarding request (=> %s), but we are no router"),
		468	c->conf->nodename, (const char *)rsi,
235	dst, conns[dst - 1]->conf->nodename,	469	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	470	}
237	THISNODE->id, THISNODE->nodename);
238	else	471	else
239	c->recv_vpn_packet (pkt, rsi);	472	c->recv_vpn_packet (pkt, rsi);
240	}	473	}
241	}	474	}
242		475
243	void	476	bool
244	vpn::udpv4_ev (io_watcher &w, short revents)	477	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
245	{	478	{
246	if (revents & (POLLIN \| POLLERR))	479	switch (si.prot)
		480	{
		481	case PROT_IPv4:
		482	return send_ipv4_packet (pkt, si, tos);
		483
		484	case PROT_UDPv4:
		485	return send_udpv4_packet (pkt, si, tos);
		486
		487	#if ENABLE_TCP
		488	case PROT_TCPv4:
		489	return send_tcpv4_packet (pkt, si, tos);
		490	#endif
		491	#if ENABLE_ICMP
		492	case PROT_ICMPv4:
		493	return send_icmpv4_packet (pkt, si, tos);
		494	#endif
		495	#if ENABLE_DNS
		496	case PROT_DNSv4:
		497	return send_dnsv4_packet (pkt, si, tos);
		498	#endif
		499	default:
		500	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		501	}
		502
		503	return false;
		504	}
		505
		506	void
		507	vpn::ipv4_ev (ev::io &w, int revents)
		508	{
		509	if (revents & EV_READ)
247	{	510	{
248	vpn_packet *pkt = new vpn_packet;	511	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	512	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	513	socklen_t sa_len = sizeof (sa);
251	int len;	514	int len;
252		515
253	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	516	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		517
255	sockinfo si(sa);	518	sockinfo si(sa, PROT_IPv4);
256		519
257	if (len > 0)	520	if (len > 0)
258	{	521	{
259	pkt->len = len;	522	pkt->len = len;
		523
		524	// raw sockets deliver the ipv4 header, but don't expect it on sends
		525	pkt->skip_hdr (IP_OVERHEAD);
260		526
261	recv_vpn_packet (pkt, si);	527	recv_vpn_packet (pkt, si);
262	}	528	}
263	else	529	else
264	{	530	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	532	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	533	}
268		534
269	delete pkt;	535	delete pkt;
270	}	536	}
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	}
277	else	537	else
278	{	538	{
279	slog (L_ERR,	539	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	540	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	541	revents);
282	exit (1);	542	exit (EXIT_FAILURE);
283	}	543	}
284	}	544	}
285		545
		546	#if ENABLE_ICMP
286	void	547	void
287	vpn::ipv4_ev (io_watcher &w, short revents)	548	vpn::icmpv4_ev (ev::io &w, int revents)
288	{	549	{
289	if (revents & (POLLIN \| POLLERR))	550	if (revents & EV_READ)
290	{	551	{
291	vpn_packet *pkt = new vpn_packet;	552	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	553	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	554	socklen_t sa_len = sizeof (sa);
294	int len;	555	int len;
295		556
296	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	557	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		558
298	sockinfo si(sa, PROT_IPv4);	559	sockinfo si(sa, PROT_ICMPv4);
299		560
300	if (len > 0)	561	if (len > 0)
301	{	562	{
302	pkt->len = len;	563	pkt->len = len;
303		564
		565	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		566
		567	if (hdr->type == ::conf.icmp_type
		568	&& hdr->code == 255)
		569	{
304	// raw sockets deliver the ipv4, but don't expect it on sends	570	// raw sockets deliver the ipv4, but don't expect it on sends
305	// this is slow, but...	571	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	572	pkt->skip_hdr (ICMP_OVERHEAD);
307		573
308	recv_vpn_packet (pkt, si);	574	recv_vpn_packet (pkt, si);
		575	}
309	}	576	}
310	else	577	else
311	{	578	{
312	// probably ECONNRESET or somesuch	579	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	580	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	581	}
315		582
316	delete pkt;	583	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	}	584	}
324	else	585	else
325	{	586	{
326	slog (L_ERR,	587	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	588	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	589	revents);
329	exit (1);	590	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_connection;
336
337	struct lt_sockinfo
338	{
339	bool operator()(const sockinfo a, const sockinfo b) const
340	{
341	return a < b;
342	}
343	};
344
345	struct tcp_si_map : public map<const sockinfo , tcp_connection , lt_sockinfo> {
346	void cleaner_cb (time_watcher &w); time_watcher cleaner;
347
348	tcp_si_map ()
349	: cleaner(this, &tcp_si_map::cleaner_cb)
350	{
351	cleaner.start (0);
352	}
353	} tcp_si;
354
355	struct tcp_connection : io_watcher {
356	tstamp last_activity;
357	const sockinfo si;
358	vpn &v;
359	bool ok;
360
361	void tcpv4_ev (io_watcher &w, short revents);
362
363	operator tcp_si_map::value_type()
364	{
365	return tcp_si_map::value_type (&si, this);
366	}
367
368	tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
369	: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev), ok(false)
370	{
371	last_activity = NOW;
372	start (fd_, POLLOUT);
373	}
374
375	~tcp_connection () { close (fd); }
376	};
377
378	void tcp_si_map::cleaner_cb (time_watcher &w)
379	{
380	w.at = NOW + 600;
381	tstamp to = NOW - ::conf.keepalive - 30;
382
383	for (iterator i = begin (); i != end(); )
384	if (i->second->last_activity >= to)
385	++i;
386	else
387	{
388	erase (i);
389	i = begin ();
390	}	591	}
391	}	592	}
		593	#endif
392		594
393	void	595	void
394	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	596	vpn::udpv4_ev (ev::io &w, int revents)
395	{	597	{
396	tcp_si_map::iterator info = tcp_si.find (&si);	598	if (revents & EV_READ)
397
398	if (info == tcp_si.end ())
399	{
400	// woaw, the first lost packet ;)
401	int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
402
403	if (fd >= 0)
404	{
405	fcntl (fd, F_SETFL, O_NONBLOCK);
406
407	if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0
408	\|\| errno == EINPROGRESS)
409	{
410	tcp_connection i = new tcp_connection (fd, si, this);
411
412	tcp_si.insert (*i);
413	}
414	else
415	close (fd);
416	}
417	}	599	{
418	else
419	{
420	tcp_connection *i = info->second;
421
422	i->last_activity = NOW;
423
424	if (i->ok)
425	{
426	setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
427
428	// we use none of the advantages of tcp
429	write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32);
430	}
431	}
432
433	#if 0
434	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
435	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
436	#endif
437	}
438
439	void
440	tcp_connection::tcpv4_ev (io_watcher &w, short revents)
441	{
442	last_activity = NOW;
443
444	if (!ok) // just established?
445	{
446	ok = true;
447	fcntl (fd, F_SETFL, 0);
448	stop ();
449	start (fd, POLLIN);
450	}
451
452	if (revents & (POLLIN \| POLLERR))
453	{
454	u32 len;
455
456	if (sizeof (len) == read (fd, &len, sizeof (len)))
457	{
458	vpn_packet *pkt = new vpn_packet;	600	vpn_packet *pkt = new vpn_packet;
459
460	if (len == read (fd, &((*pkt)[0]), len))
461	{
462	pkt->len = len;
463
464	v.recv_vpn_packet (pkt, si);
465	return;
466	}
467
468	delete pkt;
469	}
470
471	tcp_si.erase (&si);
472	stop ();
473	}
474	}
475
476	void
477	vpn::tcpv4_ev (io_watcher &w, short revents)
478	{
479	if (revents & (POLLIN \| POLLERR))
480	{
481	struct sockaddr_in sa;	601	struct sockaddr_in sa;
482	socklen_t sa_len = sizeof (sa);	602	socklen_t sa_len = sizeof (sa);
483	int len;	603	int len;
484		604
485	int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);	605	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
486		606
487	if (fd >= 0)
488	{
489	fcntl (fd, F_SETFL, O_NONBLOCK);
490
491	sockinfo si(sa, PROT_TCPv4);	607	sockinfo si(sa, PROT_UDPv4);
492	tcp_connection i = new tcp_connection (fd, si, this);
493		608
494	slog (L_ERR, "accepted %d\n", fd);//D	609	if (len > 0)
495
496	tcp_si.insert (*i);
497	}	610	{
		611	pkt->len = len;
		612
		613	recv_vpn_packet (pkt, si);
		614	}
		615	else
		616	{
		617	// probably ECONNRESET or somesuch
		618	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		619	}
		620
		621	delete pkt;
		622	}
		623	else
498	}	624	{
		625	slog (L_ERR,
		626	_("FATAL: unknown revents %08x in socket, terminating\n"),
		627	revents);
		628	exit (EXIT_FAILURE);
		629	}
499	}	630	}
500		631
501	#endif
502
503	void	632	void
504	vpn::tap_ev (io_watcher &w, short revents)	633	vpn::tap_ev (ev::io &w, int revents)
505	{	634	{
506	if (revents & POLLIN)	635	if (revents & EV_READ)
507	{	636	{
508	/* process data */	637	/* process data */
509	tap_packet *pkt;	638	tap_packet *pkt;
510		639
511	pkt = tap->recv ();	640	pkt = tap->recv ();
512		641
		642	if (!pkt)
		643	return;
		644
		645	if (pkt->len > 14)
		646	{
513	int dst = mac2id (pkt->dst);	647	int dst = mac2id (pkt->dst);
514	int src = mac2id (pkt->src);	648	int src = mac2id (pkt->src);
515		649
516	if (src != THISNODE->id)	650	if (src != THISNODE->id)
517	{
518	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
519	exit (1);
520	}
521
522	if (dst == THISNODE->id)
523	{
524	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
525	exit (1);
526	}
527
528	if (dst > conns.size ())
529	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
530	else
531	{
532	if (dst)
533	{	651	{
534	// unicast	652	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
535	if (dst != THISNODE->id)	653	exit (EXIT_FAILURE);
536	conns[dst - 1]->inject_data_packet (pkt);
537	}	654	}
		655
		656	if (dst == THISNODE->id)
		657	{
		658	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		659	exit (EXIT_FAILURE);
		660	}
		661
		662	if (dst > conns.size ())
		663	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
538	else	664	else
539	{
540	// broadcast, first check router, then self, then english
541	connection *router = find_router ();
542
543	if (router)
544	router->inject_data_packet (pkt, true);	665	inject_data_packet (pkt, dst);
545	else
546	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
547	if ((*c)->conf != THISNODE)
548	(*c)->inject_data_packet (pkt);
549	}
550	}	666	}
551		667
552	delete pkt;	668	delete pkt;
553	}
554	else if (revents & (POLLHUP \| POLLERR))
555	{
556	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
557	exit (1);
558	}	669	}
559	else	670	else
560	abort ();	671	abort ();
561	}	672	}
562		673
563	void	674	void
564	vpn::event_cb (time_watcher &w)	675	vpn::event_cb (ev::timer &w, int)
565	{	676	{
566	if (events)	677	if (events)
567	{	678	{
568	if (events & EVENT_SHUTDOWN)	679	if (events & EVENT_SHUTDOWN)
569	{	680	{
570	slog (L_INFO, _("preparing shutdown..."));	681	slog (L_INFO, _("preparing shutdown..."));
571		682
572	shutdown_all ();	683	shutdown_all ();
573
574	remove_pid (pidfilename);	684	remove_pid (conf.pidfilename);
575
576	slog (L_INFO, _("terminating"));	685	slog (L_INFO, _("terminating"));
577		686	exit (EXIT_SUCCESS);
578	exit (0);
579	}	687	}
580		688
581	if (events & EVENT_RECONNECT)	689	if (events & EVENT_RECONNECT)
582	{	690	{
583	slog (L_INFO, _("forced reconnect"));	691	slog (L_INFO, _("forced reconnect"));
…		…
585	reconnect_all ();	693	reconnect_all ();
586	}	694	}
587		695
588	events = 0;	696	events = 0;
589	}	697	}
590
591	w.at = TSTAMP_CANCEL;
592	}	698	}
593		699
594	void	700	void
595	vpn::shutdown_all ()	701	vpn::shutdown_all ()
596	{	702	{
…		…
609	connection_init ();	715	connection_init ();
610		716
611	for (configuration::node_vector::iterator i = conf.nodes.begin ();	717	for (configuration::node_vector::iterator i = conf.nodes.begin ();
612	i != conf.nodes.end (); ++i)	718	i != conf.nodes.end (); ++i)
613	{	719	{
614	connection *conn = new connection (this);	720	connection conn = new connection (this, i);
615
616	conn->conf = *i;
617	conns.push_back (conn);	721	conns.push_back (conn);
618
619	conn->establish_connection ();	722	conn->establish_connection ();
620	}	723	}
621	}	724	}
622		725
623	connection *vpn::find_router ()	726	connection *vpn::find_router ()
624	{	727	{
625	u32 prio = 0;	728	u32 prio = 1;
626	connection *router = 0;	729	connection *router = 0;
627		730
628	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	731	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
629	{	732	{
630	connection c = i;	733	connection c = i;
631		734
632	if (c->conf->routerprio > prio	735	if (c->conf->routerprio > prio
633	&& c->connectmode == conf_node::C_ALWAYS	736	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
634	&& c->conf != THISNODE
635	&& c->ictx && c->octx)	737	&& c->ictx && c->octx
		738	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
636	{	739	{
637	prio = c->conf->routerprio;	740	prio = c->conf->routerprio;
638	router = c;	741	router = c;
639	}	742	}
640	}	743	}
641		744
642	return router;	745	return router;
643	}	746	}
644		747
645	void vpn::connect_request (int id)	748	void vpn::send_connect_request (int id)
646	{	749	{
647	connection *c = find_router ();	750	connection *c = find_router ();
648		751
649	if (c)	752	if (c)
650	c->connect_request (id);	753	c->send_connect_request (id);
651	//else // does not work, because all others must connect to the same router	754	else
652	// // no router found, aggressively connect to all routers	755	// no router found, aggressively connect to all routers
653	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	756	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
654	// if ((*i)->conf->routerprio)	757	if ((i)->conf->routerprio && (i)->conf != THISNODE)
655	// (*i)->establish_connection ();	758	(*i)->establish_connection ();
656	}	759	}
657		760
658	void	761	void
659	connection::dump_status ()	762	connection::dump_status ()
660	{	763	{
…		…
668	}	771	}
669		772
670	void	773	void
671	vpn::dump_status ()	774	vpn::dump_status ()
672	{	775	{
673	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	776	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
674		777
675	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	778	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
676	(*c)->dump_status ();	779	(*c)->dump_status ();
677		780
678	slog (L_NOTICE, _("END status dump"));	781	slog (L_NOTICE, _("END status dump"));
679	}	782	}
680		783
681	vpn::vpn (void)	784	vpn::vpn (void)
682	: event(this, &vpn::event_cb)	785	: event (this, &vpn::event_cb)
683	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	786	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
684	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	787	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
685	, tap_ev_watcher (this, &vpn::tap_ev)
686	#if ENABLE_TCP	788	#if ENABLE_TCP
687	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	789	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
688	#endif	790	#endif
		791	#if ENABLE_ICMP
		792	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		793	#endif
		794	#if ENABLE_DNS
		795	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		796	#endif
		797	, tap_ev_watcher (this, &vpn::tap_ev)
689	{	798	{
690	}	799	}
691		800
692	vpn::~vpn ()	801	vpn::~vpn ()
693	{	802	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs. Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.43 by pcg, Tue Dec 4 15:01:12 2007 UTC