[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 1.45 by pcg, Thu Dec 6 00:35:29 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	inline const char *
		93	vpn::script_if_init ()
		94	{
		95	script_init_env ();
		96
		97	return tap->if_up ();
		98	}
		99
		100	inline const char *
		101	vpn::script_if_up ()
		102	{
		103	script_init_env ();
		104
		105	char *filename;
		106	asprintf (&filename,
		107	"%s/%s",
		108	confbase,
77	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	109	::conf.script_if_up ? ::conf.script_if_up : "if-up");
		110
		111	return filename;
78	}	112	}
79		113
80	int	114	int
81	vpn::setup ()	115	vpn::setup ()
82	{	116	{
		117	ipv4_tos = -1;
		118	ipv4_fd = -1;
		119
		120	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		121	{
		122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		123
		124	if (ipv4_fd < 0)
		125	return -1;
		126
		127	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		128	fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
		129
		130	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		131	// this I really consider a linux bug. I am neither connected
		132	// nor do I fragment myself. Linux still sets DF and doesn't
		133	// fragment for me sometimes.
		134	{
		135	int oval = IP_PMTUDISC_DONT;
		136	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		137	}
		138	#endif
		139
		140	sockinfo si (THISNODE, PROT_IPv4);
		141
		142	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		143	{
		144	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		145	exit (EXIT_FAILURE);
		146	}
		147
		148	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		149	}
		150
		151	udpv4_tos = -1;
83	udpv4_fd = -1;	152	udpv4_fd = -1;
84		153
85	if (THISNODE->protocols & PROT_UDPv4)	154	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	155	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	156	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		157
89	if (udpv4_fd < 0)	158	if (udpv4_fd < 0)
90	return -1;	159	return -1;
		160
		161	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		162	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
91		163
92	// standard daemon practise...	164	// standard daemon practise...
93	{	165	{
94	int oval = 1;	166	int oval = 1;
95	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	167	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96	}	168	}
97		169
98	sockinfo si (THISNODE, PROT_UDPv4);	170	#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	171	// this I really consider a linux bug. I am neither connected
108	// 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
109	// fragment for me sometimes.	173	// fragment for me sometimes.
110	{	174	{
111	int oval = IP_PMTUDISC_DONT;	175	int oval = IP_PMTUDISC_DONT;
112	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	176	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113	}	177	}
114	#endif	178	#endif
115		179
		180	sockinfo si (THISNODE, PROT_UDPv4);
		181
		182	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		183	{
		184	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		185	exit (EXIT_FAILURE);
		186	}
		187
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	188	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
117	}	189	}
118		190
		191	icmpv4_tos = -1;
119	ipv4_fd = -1;	192	icmpv4_fd = -1;
		193
		194	#if ENABLE_ICMP
120	if (THISNODE->protocols & PROT_IPv4)	195	if (THISNODE->protocols & PROT_ICMPv4)
121	{	196	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	197	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123		198
124	if (ipv4_fd < 0)	199	if (icmpv4_fd < 0)
125	return -1;	200	return -1;
126		201
127	sockinfo si (THISNODE, PROT_IPv4);	202	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		203	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
128		204
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	205	#ifdef ICMP_FILTER
130	{	206	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	207	icmp_filter oval;
132	exit (1);	208	oval.data = 0xffffffff;
		209	if (::conf.icmp_type < 32)
		210	oval.data &= ~(1 << ::conf.icmp_type);
		211
		212	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133	}	213	}
		214	#endif
134		215
135	#ifdef IP_MTU_DISCOVER	216	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136	// this I really consider a linux bug. I am neither connected	217	// this I really consider a linux bug. I am neither connected
137	// nor do I fragment myself. Linux still sets DF and doesn't	218	// nor do I fragment myself. Linux still sets DF and doesn't
138	// fragment for me sometimes.	219	// fragment for me sometimes.
139	{	220	{
140	int oval = IP_PMTUDISC_DONT;	221	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	222	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	223	}
143	#endif	224	#endif
144		225
		226	sockinfo si (THISNODE, PROT_ICMPv4);
		227
		228	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		229	{
		230	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		231	exit (EXIT_FAILURE);
		232	}
		233
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	234	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
146	}	235	}
		236	#endif
		237
		238	tcpv4_fd = -1;
147		239
148	#if ENABLE_TCP	240	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	241	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	242	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	243	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		244
153	if (tcpv4_fd < 0)	245	if (tcpv4_fd < 0)
154	return -1;	246	return -1;
		247
		248	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
		249	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
155		250
156	// standard daemon practise...	251	// standard daemon practise...
157	{	252	{
158	int oval = 1;	253	int oval = 1;
159	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	254	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
162	sockinfo si (THISNODE, PROT_TCPv4);	257	sockinfo si (THISNODE, PROT_TCPv4);
163		258
164	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	259	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
165	{	260	{
166	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	261	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);	262	exit (EXIT_FAILURE);
168	}	263	}
169		264
170	if (listen (tcpv4_fd, 5))	265	if (listen (tcpv4_fd, 5))
171	{	266	{
172	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	267	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
173	exit (1);	268	exit (EXIT_FAILURE);
		269	}
		270
		271	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		272	}
		273	#endif
		274
		275	dnsv4_tos = -1;
		276	dnsv4_fd = -1;
		277
		278	#if ENABLE_DNS
		279	if (THISNODE->protocols & PROT_DNSv4)
		280	{
		281	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		282
		283	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		284
		285	if (dnsv4_fd < 0)
		286	return -1;
		287
		288	fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
		289	fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
		290
		291	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		292	// this I really consider a linux bug. I am neither connected
		293	// nor do I fragment myself. Linux still sets DF and doesn't
		294	// fragment for me sometimes.
		295	{
		296	int oval = IP_PMTUDISC_DONT;
		297	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
174	}	298	}
175
176	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177	}
178	#endif	299	# endif
		300
		301	// standard daemon practise...
		302	{
		303	int oval = 1;
		304	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		305	}
		306
		307	sockinfo si (THISNODE->dns_hostname,
		308	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		309	PROT_DNSv4);
		310
		311	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		312	{
		313	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		314	exit (EXIT_FAILURE);
		315	}
		316
		317	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		318	}
		319	#endif
		320
		321	/////////////////////////////////////////////////////////////////////////////
		322
		323	reconnect_all ();
		324
		325	/////////////////////////////////////////////////////////////////////////////
179		326
180	tap = new tap_device ();	327	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	328	if (!tap) //D this, of course, never catches
182	{	329	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	330	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	331	exit (EXIT_FAILURE);
185	}	332	}
186		333
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	334	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
188		335
		336	run_script_cb cb;
		337	cb.set<vpn, &vpn::script_if_init> (this);
		338
		339	if (tap->if_up () &&
		340	!run_script (cb, true))
		341	{
		342	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		343	tap->if_up ());
		344	exit (EXIT_FAILURE);
		345	}
		346
		347	cb.set<vpn, &vpn::script_if_up> (this);
		348	if (!run_script (cb, true))
		349	{
		350	slog (L_ERR, _("if-up command execution failed, exiting."));
		351	exit (EXIT_FAILURE);
		352	}
		353
189	tap_ev_watcher.start (tap->fd, POLLIN);	354	tap_ev_watcher.start (tap->fd, EV_READ);
190
191	reconnect_all ();
192		355
193	return 0;	356	return 0;
194	}	357	}
195		358
		359	bool
		360	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		361	{
		362	set_tos (ipv4_fd, ipv4_tos, tos);
		363	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		364
		365	return true;
		366	}
		367
		368	static u16
		369	ipv4_checksum (u16 *data, unsigned int len)
		370	{
		371	// use 32 bit accumulator and fold back carry bits at the end
		372	u32 sum = 0;
		373
		374	while (len > 1)
		375	{
		376	sum += *data++;
		377	len -= 2;
		378	}
		379
		380	// odd byte left?
		381	if (len)
		382	sum += (u8 )data;
		383
		384	// add back carry bits
		385	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		386	sum += (sum >> 16); // carry
		387
		388	return ~sum;
		389	}
		390
		391	#if ENABLE_ICMP
		392	bool
		393	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		394	{
		395	pkt->unshift_hdr (4);
		396
		397	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		398	hdr->type = ::conf.icmp_type;
		399	hdr->code = 255;
		400	hdr->checksum = 0;
		401	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		402
		403	set_tos (icmpv4_fd, icmpv4_tos, tos);
		404	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		405
		406	return true;
		407	}
		408	#endif
		409
		410	bool
		411	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		412	{
		413	set_tos (udpv4_fd, udpv4_tos, tos);
		414	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		415
		416	return true;
		417	}
		418
196	void	419	void
197	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	420	vpn::inject_data_packet (tap_packet *pkt, int dst)
198	{	421	{
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	422	if (dst)
200	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	423	{
201	}	424	// unicast
202		425	if (dst != THISNODE->id)
203	void	426	conns[dst - 1]->inject_data_packet (pkt);
204	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	427	}
205	{	428	else
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	429	{
207	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	430	// broadcast, this is ugly, but due to the security policy
		431	// we have to connect to all hosts...
		432	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		433	if ((*c)->conf != THISNODE)
		434	(*c)->inject_data_packet (pkt, true);
		435	}
208	}	436	}
209		437
210	void	438	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	439	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	440	{
…		…
219	if (src == 0 \|\| src > conns.size ()	447	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	448	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	449	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	450	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	451	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		452	else if (dst > conns.size ())
		453	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		454	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224	else	455	else
225	{	456	{
226	connection *c = conns[src - 1];	457	connection *c = conns[src - 1];
227		458
228	if (dst == 0 && !THISNODE->routerprio)	459	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	460	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	461	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	462	else if (dst != THISNODE->id)
232	// FORWARDING NEEDED ;)	463	{
		464	if (THISNODE->routerprio)
		465	// the tos setting gets lost here. who cares.
		466	conns[dst - 1]->inject_vpn_packet (pkt);
		467	else
233	slog (L_WARN,	468	slog (L_WARN,
234	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	469	_("%s(%s): forwarding request (=> %s), but we are no router"),
		470	c->conf->nodename, (const char *)rsi,
235	dst, conns[dst - 1]->conf->nodename,	471	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	472	}
237	THISNODE->id, THISNODE->nodename);
238	else	473	else
239	c->recv_vpn_packet (pkt, rsi);	474	c->recv_vpn_packet (pkt, rsi);
240	}	475	}
241	}	476	}
242		477
243	void	478	bool
244	vpn::udpv4_ev (io_watcher &w, short revents)	479	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
245	{	480	{
246	if (revents & (POLLIN \| POLLERR))	481	switch (si.prot)
		482	{
		483	case PROT_IPv4:
		484	return send_ipv4_packet (pkt, si, tos);
		485
		486	case PROT_UDPv4:
		487	return send_udpv4_packet (pkt, si, tos);
		488
		489	#if ENABLE_TCP
		490	case PROT_TCPv4:
		491	return send_tcpv4_packet (pkt, si, tos);
		492	#endif
		493	#if ENABLE_ICMP
		494	case PROT_ICMPv4:
		495	return send_icmpv4_packet (pkt, si, tos);
		496	#endif
		497	#if ENABLE_DNS
		498	case PROT_DNSv4:
		499	return send_dnsv4_packet (pkt, si, tos);
		500	#endif
		501	default:
		502	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		503	}
		504
		505	return false;
		506	}
		507
		508	inline void
		509	vpn::ipv4_ev (ev::io &w, int revents)
		510	{
		511	if (revents & EV_READ)
247	{	512	{
248	vpn_packet *pkt = new vpn_packet;	513	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	514	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	515	socklen_t sa_len = sizeof (sa);
251	int len;	516	int len;
252		517
253	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	518	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		519
255	sockinfo si(sa);	520	sockinfo si(sa, PROT_IPv4);
256		521
257	if (len > 0)	522	if (len > 0)
258	{	523	{
259	pkt->len = len;	524	pkt->len = len;
		525
		526	// raw sockets deliver the ipv4 header, but don't expect it on sends
		527	pkt->skip_hdr (IP_OVERHEAD);
260		528
261	recv_vpn_packet (pkt, si);	529	recv_vpn_packet (pkt, si);
262	}	530	}
263	else	531	else
264	{	532	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	534	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	535	}
268		536
269	delete pkt;	537	delete pkt;
270	}	538	}
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	539	else
278	{	540	{
279	slog (L_ERR,	541	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	542	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	543	revents);
282	exit (1);	544	exit (EXIT_FAILURE);
283	}	545	}
284	}	546	}
285		547
286	void	548	#if ENABLE_ICMP
		549	inline void
287	vpn::ipv4_ev (io_watcher &w, short revents)	550	vpn::icmpv4_ev (ev::io &w, int revents)
288	{	551	{
289	if (revents & (POLLIN \| POLLERR))	552	if (revents & EV_READ)
290	{	553	{
291	vpn_packet *pkt = new vpn_packet;	554	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	555	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	556	socklen_t sa_len = sizeof (sa);
294	int len;	557	int len;
295		558
296	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	559	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		560
298	sockinfo si(sa, PROT_IPv4);	561	sockinfo si(sa, PROT_ICMPv4);
299		562
300	if (len > 0)	563	if (len > 0)
301	{	564	{
302	pkt->len = len;	565	pkt->len = len;
303		566
		567	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		568
		569	if (hdr->type == ::conf.icmp_type
		570	&& hdr->code == 255)
		571	{
304	// raw sockets deliver the ipv4, but don't expect it on sends	572	// raw sockets deliver the ipv4, but don't expect it on sends
305	// this is slow, but...	573	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	574	pkt->skip_hdr (ICMP_OVERHEAD);
307		575
308	recv_vpn_packet (pkt, si);	576	recv_vpn_packet (pkt, si);
		577	}
309	}	578	}
310	else	579	else
311	{	580	{
312	// probably ECONNRESET or somesuch	581	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	582	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	583	}
315		584
316	delete pkt;	585	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	}	586	}
324	else	587	else
325	{	588	{
326	slog (L_ERR,	589	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	590	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	591	revents);
329	exit (1);	592	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	}	593	}
391	}	594	}
		595	#endif
392		596
393	void	597	inline void
394	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	598	vpn::udpv4_ev (ev::io &w, int revents)
395	{	599	{
396	tcp_si_map::iterator info = tcp_si.find (&si);	600	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	}	601	{
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;	602	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;	603	struct sockaddr_in sa;
482	socklen_t sa_len = sizeof (sa);	604	socklen_t sa_len = sizeof (sa);
483	int len;	605	int len;
484		606
485	int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);	607	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
486		608
487	if (fd >= 0)
488	{
489	fcntl (fd, F_SETFL, O_NONBLOCK);
490
491	sockinfo si(sa, PROT_TCPv4);	609	sockinfo si(sa, PROT_UDPv4);
492	tcp_connection i = new tcp_connection (fd, si, this);
493		610
494	slog (L_ERR, "accepted %d\n", fd);//D	611	if (len > 0)
495
496	tcp_si.insert (*i);
497	}	612	{
		613	pkt->len = len;
		614
		615	recv_vpn_packet (pkt, si);
		616	}
		617	else
		618	{
		619	// probably ECONNRESET or somesuch
		620	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		621	}
		622
		623	delete pkt;
		624	}
		625	else
498	}	626	{
		627	slog (L_ERR,
		628	_("FATAL: unknown revents %08x in socket, terminating\n"),
		629	revents);
		630	exit (EXIT_FAILURE);
		631	}
499	}	632	}
500		633
501	#endif	634	inline void
502
503	void
504	vpn::tap_ev (io_watcher &w, short revents)	635	vpn::tap_ev (ev::io &w, int revents)
505	{	636	{
506	if (revents & POLLIN)	637	if (revents & EV_READ)
507	{	638	{
508	/* process data */	639	/* process data */
509	tap_packet *pkt;	640	tap_packet *pkt;
510		641
511	pkt = tap->recv ();	642	pkt = tap->recv ();
512		643
		644	if (!pkt)
		645	return;
		646
		647	if (pkt->len > 14)
		648	{
513	int dst = mac2id (pkt->dst);	649	int dst = mac2id (pkt->dst);
514	int src = mac2id (pkt->src);	650	int src = mac2id (pkt->src);
515		651
516	if (src != THISNODE->id)	652	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	{	653	{
534	// unicast	654	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
535	if (dst != THISNODE->id)	655	exit (EXIT_FAILURE);
536	conns[dst - 1]->inject_data_packet (pkt);
537	}	656	}
		657
		658	if (dst == THISNODE->id)
		659	{
		660	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		661	exit (EXIT_FAILURE);
		662	}
		663
		664	if (dst > conns.size ())
		665	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
538	else	666	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);	667	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	}	668	}
551		669
552	delete pkt;	670	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	}	671	}
559	else	672	else
560	abort ();	673	abort ();
561	}	674	}
562		675
563	void	676	inline void
564	vpn::event_cb (time_watcher &w)	677	vpn::event_cb (ev::timer &w, int)
565	{	678	{
566	if (events)	679	if (events)
567	{	680	{
568	if (events & EVENT_SHUTDOWN)	681	if (events & EVENT_SHUTDOWN)
569	{	682	{
570	slog (L_INFO, _("preparing shutdown..."));	683	slog (L_INFO, _("preparing shutdown..."));
571		684
572	shutdown_all ();	685	shutdown_all ();
573
574	remove_pid (pidfilename);	686	remove_pid (conf.pidfilename);
575
576	slog (L_INFO, _("terminating"));	687	slog (L_INFO, _("terminating"));
577		688	exit (EXIT_SUCCESS);
578	exit (0);
579	}	689	}
580		690
581	if (events & EVENT_RECONNECT)	691	if (events & EVENT_RECONNECT)
582	{	692	{
583	slog (L_INFO, _("forced reconnect"));	693	slog (L_INFO, _("forced reconnect"));
…		…
585	reconnect_all ();	695	reconnect_all ();
586	}	696	}
587		697
588	events = 0;	698	events = 0;
589	}	699	}
590
591	w.at = TSTAMP_CANCEL;
592	}	700	}
593		701
594	void	702	void
595	vpn::shutdown_all ()	703	vpn::shutdown_all ()
596	{	704	{
…		…
609	connection_init ();	717	connection_init ();
610		718
611	for (configuration::node_vector::iterator i = conf.nodes.begin ();	719	for (configuration::node_vector::iterator i = conf.nodes.begin ();
612	i != conf.nodes.end (); ++i)	720	i != conf.nodes.end (); ++i)
613	{	721	{
614	connection *conn = new connection (this);	722	connection conn = new connection (this, i);
615
616	conn->conf = *i;
617	conns.push_back (conn);	723	conns.push_back (conn);
618
619	conn->establish_connection ();	724	conn->establish_connection ();
620	}	725	}
621	}	726	}
622		727
623	connection *vpn::find_router ()	728	connection *vpn::find_router ()
624	{	729	{
625	u32 prio = 0;	730	u32 prio = 1;
626	connection *router = 0;	731	connection *router = 0;
627		732
628	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	733	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
629	{	734	{
630	connection c = i;	735	connection c = i;
631		736
632	if (c->conf->routerprio > prio	737	if (c->conf->routerprio > prio
633	&& c->connectmode == conf_node::C_ALWAYS	738	&& 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)	739	&& c->ictx && c->octx
		740	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
636	{	741	{
637	prio = c->conf->routerprio;	742	prio = c->conf->routerprio;
638	router = c;	743	router = c;
639	}	744	}
640	}	745	}
641		746
642	return router;	747	return router;
643	}	748	}
644		749
645	void vpn::connect_request (int id)	750	void vpn::send_connect_request (int id)
646	{	751	{
647	connection *c = find_router ();	752	connection *c = find_router ();
648		753
649	if (c)	754	if (c)
650	c->connect_request (id);	755	c->send_connect_request (id);
651	//else // does not work, because all others must connect to the same router	756	else
652	// // no router found, aggressively connect to all routers	757	// no router found, aggressively connect to all routers
653	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	758	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
654	// if ((*i)->conf->routerprio)	759	if ((i)->conf->routerprio && (i)->conf != THISNODE)
655	// (*i)->establish_connection ();	760	(*i)->establish_connection ();
656	}	761	}
657		762
658	void	763	void
659	connection::dump_status ()	764	connection::dump_status ()
660	{	765	{
…		…
668	}	773	}
669		774
670	void	775	void
671	vpn::dump_status ()	776	vpn::dump_status ()
672	{	777	{
673	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	778	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
674		779
675	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	780	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
676	(*c)->dump_status ();	781	(*c)->dump_status ();
677		782
678	slog (L_NOTICE, _("END status dump"));	783	slog (L_NOTICE, _("END status dump"));
679	}	784	}
680		785
681	vpn::vpn (void)	786	vpn::vpn (void)
682	: event(this, &vpn::event_cb)	787	{
		788	event .set<vpn, &vpn::event_cb > (this);
683	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	789	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
684	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	790	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
685	, tap_ev_watcher (this, &vpn::tap_ev)
686	#if ENABLE_TCP	791	#if ENABLE_TCP
687	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	792	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
688	#endif	793	#endif
689	{	794	#if ENABLE_ICMP
		795	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		796	#endif
		797	#if ENABLE_DNS
		798	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		799	#endif
		800	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
690	}	801	}
691		802
692	vpn::~vpn ()	803	vpn::~vpn ()
693	{	804	{
694	}	805	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/vpn.C (file contents): Revision 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs. Revision 1.45 by pcg, Thu Dec 6 00:35:29 2007 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.45 by pcg, Thu Dec 6 00:35:29 2007 UTC