[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 1.42 by pcg, Sun Dec 2 00:54:52 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;
91		158
92	sockinfo si (THISNODE, PROT_UDPv4);	159	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
		160	fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
93		161
94	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))	162	// standard daemon practise...
95	{	163	{
96	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));	164	int oval = 1;
97	exit (1);	165	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98	}	166	}
99		167
100	#ifdef IP_MTU_DISCOVER	168	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101	// this I really consider a linux bug. I am neither connected	169	// this I really consider a linux bug. I am neither connected
102	// 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
103	// fragment for me sometimes.	171	// fragment for me sometimes.
104	{	172	{
105	int oval = IP_PMTUDISC_DONT;	173	int oval = IP_PMTUDISC_DONT;
106	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	174	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107	}	175	}
108	#endif	176	#endif
109		177
110	// standard daemon practise...	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
		186	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		187	}
		188
		189	icmpv4_tos = -1;
		190	icmpv4_fd = -1;
		191
		192	#if ENABLE_ICMP
		193	if (THISNODE->protocols & PROT_ICMPv4)
		194	{
		195	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
		196
		197	if (icmpv4_fd < 0)
		198	return -1;
		199
		200	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
		201	fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC);
		202
		203	#ifdef ICMP_FILTER
111	{	204	{
112	int oval = 1;	205	icmp_filter oval;
		206	oval.data = 0xffffffff;
		207	if (::conf.icmp_type < 32)
		208	oval.data &= ~(1 << ::conf.icmp_type);
		209
113	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	210	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114	}	211	}
		212	#endif
115		213
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	214	#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	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;
155		245
156	sockinfo si (THISNODE, PROT_TCPv4);	246	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
157		247	fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
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		248
170	// standard daemon practise...	249	// standard daemon practise...
171	{	250	{
172	int oval = 1;	251	int oval = 1;
173	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	252	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174	}	253	}
175		254
		255	sockinfo si (THISNODE, PROT_TCPv4);
		256
		257	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
		258	{
		259	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		260	exit (EXIT_FAILURE);
		261	}
		262
		263	if (listen (tcpv4_fd, 5))
		264	{
		265	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
		266	exit (EXIT_FAILURE);
		267	}
		268
176	tcpv4_accept_watcher.start (tcpv4_fd, POLLIN);	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);
177	}	296	}
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
		332	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
		333
		334	if (tap->if_up () &&
		335	!run_script (run_script_cb (this, &vpn::script_if_init), true))
		336	{
		337	slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
		338	tap->if_up ());
		339	exit (EXIT_FAILURE);
		340	}
		341
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	342	if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
		343	{
		344	slog (L_ERR, _("if-up command execution failed, exiting."));
		345	exit (EXIT_FAILURE);
		346	}
188		347
189	tap_ev_watcher.start (tap->fd, POLLIN);	348	tap_ev_watcher.start (tap->fd, EV_READ);
190
191	reconnect_all ();
192		349
193	return 0;	350	return 0;
194	}	351	}
195		352
196	void	353	bool
197	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	354	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198	{	355	{
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	356	set_tos (ipv4_fd, ipv4_tos, tos);
200	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	357	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201	}
202		358
203	void	359	return true;
		360	}
		361
		362	static u16
		363	ipv4_checksum (u16 *data, unsigned int len)
		364	{
		365	// use 32 bit accumulator and fold back carry bits at the end
		366	u32 sum = 0;
		367
		368	while (len > 1)
		369	{
		370	sum += *data++;
		371	len -= 2;
		372	}
		373
		374	// odd byte left?
		375	if (len)
		376	sum += (u8 )data;
		377
		378	// add back carry bits
		379	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		380	sum += (sum >> 16); // carry
		381
		382	return ~sum;
		383	}
		384
		385	#if ENABLE_ICMP
		386	bool
		387	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		388	{
		389	pkt->unshift_hdr (4);
		390
		391	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		392	hdr->type = ::conf.icmp_type;
		393	hdr->code = 255;
		394	hdr->checksum = 0;
		395	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		396
		397	set_tos (icmpv4_fd, icmpv4_tos, tos);
		398	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		399
		400	return true;
		401	}
		402	#endif
		403
		404	bool
204	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	405	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205	{	406	{
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	407	set_tos (udpv4_fd, udpv4_tos, tos);
207	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	408	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		409
		410	return true;
		411	}
		412
		413	void
		414	vpn::inject_data_packet (tap_packet *pkt, int dst)
		415	{
		416	if (dst)
		417	{
		418	// unicast
		419	if (dst != THISNODE->id)
		420	conns[dst - 1]->inject_data_packet (pkt);
		421	}
		422	else
		423	{
		424	// broadcast, this is ugly, but due to the security policy
		425	// we have to connect to all hosts...
		426	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		427	if ((*c)->conf != THISNODE)
		428	(*c)->inject_data_packet (pkt, true);
		429	}
208	}	430	}
209		431
210	void	432	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	433	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	434	{
219	if (src == 0 \|\| src > conns.size ()	441	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	442	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	443	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	444	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	445	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		446	else if (dst > conns.size ())
		447	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		448	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224	else	449	else
225	{	450	{
226	connection *c = conns[src - 1];	451	connection *c = conns[src - 1];
227		452
228	if (dst == 0 && !THISNODE->routerprio)	453	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	454	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	455	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	456	else if (dst != THISNODE->id)
232	// FORWARDING NEEDED ;)	457	{
		458	if (THISNODE->routerprio)
		459	// the tos setting gets lost here. who cares.
		460	conns[dst - 1]->inject_vpn_packet (pkt);
		461	else
233	slog (L_WARN,	462	slog (L_WARN,
234	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	463	_("%s(%s): forwarding request (=> %s), but we are no router"),
		464	c->conf->nodename, (const char *)rsi,
235	dst, conns[dst - 1]->conf->nodename,	465	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	466	}
237	THISNODE->id, THISNODE->nodename);
238	else	467	else
239	c->recv_vpn_packet (pkt, rsi);	468	c->recv_vpn_packet (pkt, rsi);
240	}	469	}
241	}	470	}
242		471
243	void	472	bool
244	vpn::udpv4_ev (int fd, short revents)	473	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
245	{	474	{
246	if (revents & (POLLIN \| POLLERR))	475	switch (si.prot)
		476	{
		477	case PROT_IPv4:
		478	return send_ipv4_packet (pkt, si, tos);
		479
		480	case PROT_UDPv4:
		481	return send_udpv4_packet (pkt, si, tos);
		482
		483	#if ENABLE_TCP
		484	case PROT_TCPv4:
		485	return send_tcpv4_packet (pkt, si, tos);
		486	#endif
		487	#if ENABLE_ICMP
		488	case PROT_ICMPv4:
		489	return send_icmpv4_packet (pkt, si, tos);
		490	#endif
		491	#if ENABLE_DNS
		492	case PROT_DNSv4:
		493	return send_dnsv4_packet (pkt, si, tos);
		494	#endif
		495	default:
		496	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		497	}
		498
		499	return false;
		500	}
		501
		502	void
		503	vpn::ipv4_ev (ev::io &w, int revents)
		504	{
		505	if (revents & EV_READ)
247	{	506	{
248	vpn_packet *pkt = new vpn_packet;	507	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	508	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	509	socklen_t sa_len = sizeof (sa);
251	int len;	510	int len;
252		511
253	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	512	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		513
255	sockinfo si(sa);	514	sockinfo si(sa, PROT_IPv4);
256		515
257	if (len > 0)	516	if (len > 0)
258	{	517	{
259	pkt->len = len;	518	pkt->len = len;
		519
		520	// raw sockets deliver the ipv4 header, but don't expect it on sends
		521	pkt->skip_hdr (IP_OVERHEAD);
260		522
261	recv_vpn_packet (pkt, si);	523	recv_vpn_packet (pkt, si);
262	}	524	}
263	else	525	else
264	{	526	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	528	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	529	}
268		530
269	delete pkt;	531	delete pkt;
270	}	532	}
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	533	else
278	{	534	{
279	slog (L_ERR,	535	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	536	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	537	revents);
282	exit (1);	538	exit (EXIT_FAILURE);
283	}	539	}
284	}	540	}
285		541
		542	#if ENABLE_ICMP
286	void	543	void
287	vpn::ipv4_ev (int fd, short revents)	544	vpn::icmpv4_ev (ev::io &w, int revents)
288	{	545	{
289	if (revents & (POLLIN \| POLLERR))	546	if (revents & EV_READ)
290	{	547	{
291	vpn_packet *pkt = new vpn_packet;	548	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	549	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	550	socklen_t sa_len = sizeof (sa);
294	int len;	551	int len;
295		552
296	len = recvfrom (fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	553	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		554
298	sockinfo si(sa, PROT_IPv4);	555	sockinfo si(sa, PROT_ICMPv4);
299		556
300	if (len > 0)	557	if (len > 0)
301	{	558	{
302	pkt->len = len;	559	pkt->len = len;
303		560
		561	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		562
		563	if (hdr->type == ::conf.icmp_type
		564	&& hdr->code == 255)
		565	{
304	// raw sockets deliver the ipv4, but don't expect it on sends	566	// raw sockets deliver the ipv4, but don't expect it on sends
305	// this is slow, but...	567	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	568	pkt->skip_hdr (ICMP_OVERHEAD);
307		569
308	recv_vpn_packet (pkt, si);	570	recv_vpn_packet (pkt, si);
		571	}
309	}	572	}
310	else	573	else
311	{	574	{
312	// probably ECONNRESET or somesuch	575	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	576	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	577	}
315		578
316	delete pkt;	579	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	}	580	}
324	else	581	else
325	{	582	{
326	slog (L_ERR,	583	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	584	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	585	revents);
329	exit (1);	586	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	{	587	}
343	fd = -1;	588	}
		589	#endif
		590
		591	void
		592	vpn::udpv4_ev (ev::io &w, int revents)
		593	{
		594	if (revents & EV_READ)
344	}	595	{
345		596	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;	597	struct sockaddr_in sa;
415	socklen_t sa_len = sizeof (sa);	598	socklen_t sa_len = sizeof (sa);
416	int len;	599	int len;
417		600
418	fd = accept (fd, (sockaddr *)&sa, &sa_len);	601	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
419		602
420	if (fd >= 0)
421	{
422	fcntl (fd, F_SETFL, O_NONBLOCK);
423
424	sockinfo si(sa, PROT_TCPv4);	603	sockinfo si(sa, PROT_UDPv4);
425	tcp_info *i = new tcp_info (this);
426		604
427	i->fd = fd;	605	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	}	606	{
434	}	607	pkt->len = len;
435	}
436		608
437	void	609	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	{	610	}
446	tcp_info *i = info->second;	611	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	}	612	{
		613	// probably ECONNRESET or somesuch
		614	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		615	}
		616
		617	delete pkt;
		618	}
		619	else
465	}	620	{
		621	slog (L_ERR,
		622	_("FATAL: unknown revents %08x in socket, terminating\n"),
		623	revents);
		624	exit (EXIT_FAILURE);
		625	}
466	}	626	}
467		627
468	#endif
469
470	void	628	void
471	vpn::tap_ev (int fd, short revents)	629	vpn::tap_ev (ev::io &w, int revents)
472	{	630	{
473	if (revents & POLLIN)	631	if (revents & EV_READ)
474	{	632	{
475	/* process data */	633	/* process data */
476	tap_packet *pkt;	634	tap_packet *pkt;
477		635
478	pkt = tap->recv ();	636	pkt = tap->recv ();
479		637
		638	if (!pkt)
		639	return;
		640
		641	if (pkt->len > 14)
		642	{
480	int dst = mac2id (pkt->dst);	643	int dst = mac2id (pkt->dst);
481	int src = mac2id (pkt->src);	644	int src = mac2id (pkt->src);
482		645
483	if (src != THISNODE->id)	646	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	{	647	{
501	// unicast	648	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
502	if (dst != THISNODE->id)	649	exit (EXIT_FAILURE);
503	conns[dst - 1]->inject_data_packet (pkt);
504	}	650	}
		651
		652	if (dst == THISNODE->id)
		653	{
		654	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		655	exit (EXIT_FAILURE);
		656	}
		657
		658	if (dst > conns.size ())
		659	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
505	else	660	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);	661	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	}	662	}
518		663
519	delete pkt;	664	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	}	665	}
526	else	666	else
527	abort ();	667	abort ();
528	}	668	}
529		669
530	void	670	void
531	vpn::event_cb (tstamp &ts)	671	vpn::event_cb (ev::timer &w, int)
532	{	672	{
533	if (events)	673	if (events)
534	{	674	{
535	if (events & EVENT_SHUTDOWN)	675	if (events & EVENT_SHUTDOWN)
536	{	676	{
537	slog (L_INFO, _("preparing shutdown..."));	677	slog (L_INFO, _("preparing shutdown..."));
538		678
539	shutdown_all ();	679	shutdown_all ();
540
541	remove_pid (pidfilename);	680	remove_pid (conf.pidfilename);
542
543	slog (L_INFO, _("terminating"));	681	slog (L_INFO, _("terminating"));
544		682	exit (EXIT_SUCCESS);
545	exit (0);
546	}	683	}
547		684
548	if (events & EVENT_RECONNECT)	685	if (events & EVENT_RECONNECT)
549	{	686	{
550	slog (L_INFO, _("forced reconnect"));	687	slog (L_INFO, _("forced reconnect"));
…		…
552	reconnect_all ();	689	reconnect_all ();
553	}	690	}
554		691
555	events = 0;	692	events = 0;
556	}	693	}
557
558	ts = TSTAMP_CANCEL;
559	}	694	}
560		695
561	void	696	void
562	vpn::shutdown_all ()	697	vpn::shutdown_all ()
563	{	698	{
…		…
576	connection_init ();	711	connection_init ();
577		712
578	for (configuration::node_vector::iterator i = conf.nodes.begin ();	713	for (configuration::node_vector::iterator i = conf.nodes.begin ();
579	i != conf.nodes.end (); ++i)	714	i != conf.nodes.end (); ++i)
580	{	715	{
581	connection *conn = new connection (this);	716	connection conn = new connection (this, i);
582
583	conn->conf = *i;
584	conns.push_back (conn);	717	conns.push_back (conn);
585
586	conn->establish_connection ();	718	conn->establish_connection ();
587	}	719	}
588	}	720	}
589		721
590	connection *vpn::find_router ()	722	connection *vpn::find_router ()
591	{	723	{
592	u32 prio = 0;	724	u32 prio = 1;
593	connection *router = 0;	725	connection *router = 0;
594		726
595	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	727	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596	{	728	{
597	connection c = i;	729	connection c = i;
598		730
599	if (c->conf->routerprio > prio	731	if (c->conf->routerprio > prio
600	&& c->connectmode == conf_node::C_ALWAYS	732	&& 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)	733	&& c->ictx && c->octx
		734	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603	{	735	{
604	prio = c->conf->routerprio;	736	prio = c->conf->routerprio;
605	router = c;	737	router = c;
606	}	738	}
607	}	739	}
608		740
609	return router;	741	return router;
610	}	742	}
611		743
612	void vpn::connect_request (int id)	744	void vpn::send_connect_request (int id)
613	{	745	{
614	connection *c = find_router ();	746	connection *c = find_router ();
615		747
616	if (c)	748	if (c)
617	c->connect_request (id);	749	c->send_connect_request (id);
618	//else // does not work, because all others must connect to the same router	750	else
619	// // no router found, aggressively connect to all routers	751	// no router found, aggressively connect to all routers
620	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	752	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621	// if ((*i)->conf->routerprio)	753	if ((i)->conf->routerprio && (i)->conf != THISNODE)
622	// (*i)->establish_connection ();	754	(*i)->establish_connection ();
623	}	755	}
624		756
625	void	757	void
626	connection::dump_status ()	758	connection::dump_status ()
627	{	759	{
…		…
635	}	767	}
636		768
637	void	769	void
638	vpn::dump_status ()	770	vpn::dump_status ()
639	{	771	{
640	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	772	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
641		773
642	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	774	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
643	(*c)->dump_status ();	775	(*c)->dump_status ();
644		776
645	slog (L_NOTICE, _("END status dump"));	777	slog (L_NOTICE, _("END status dump"));
646	}	778	}
647		779
648	vpn::vpn (void)	780	vpn::vpn (void)
649	: event(this, &vpn::event_cb)	781	: event (this, &vpn::event_cb)
650	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	782	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	783	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652	, tap_ev_watcher (this, &vpn::tap_ev)
653	#if ENABLE_TCP	784	#if ENABLE_TCP
654	, tcpv4_accept_watcher(this, &vpn::tcpv4_accept)	785	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655	#endif	786	#endif
		787	#if ENABLE_ICMP
		788	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		789	#endif
		790	#if ENABLE_DNS
		791	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		792	#endif
		793	, tap_ev_watcher (this, &vpn::tap_ev)
656	{	794	{
657	}	795	}
658		796
659	vpn::~vpn ()	797	vpn::~vpn ()
660	{	798	{

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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 1.42 by pcg, Sun Dec 2 00:54:52 2007 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 1.42 by pcg, Sun Dec 2 00:54:52 2007 UTC