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

Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.67 by root, Fri Oct 11 04:07:24 2013 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2008,2010,2011,2013 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 it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	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, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	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 GNU General
12	GNU General Public License for more details.	15	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 along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	#include <list>	34	#include <list>
22		35
		36	#include <cstdio>
		37	#include <cstring>
23	#include <cstdlib>	38	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		39
27	#include <sys/types.h>	40	#include <sys/types.h>
28	#include <sys/socket.h>	41	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	42	#include <sys/wait.h>
31	#include <netinet/in.h>	43	#include <sys/stat.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	44	#include <errno.h>
34	#include <time.h>	45	#include <time.h>
35	#include <unistd.h>	46	#include <unistd.h>
		47	#include <fcntl.h>
		48	#include <sys/socket.h>
		49
		50	#include "netcompat.h"
36		51
37	#include "pidfile.h"	52	#include "pidfile.h"
38		53
39	#include "connection.h"	54	#include "connection.h"
40	#include "util.h"	55	#include "util.h"
41	#include "vpn.h"	56	#include "vpn.h"
42		57
		58	using namespace std;
		59
		60	vpn network; // THE vpn (bad design...)
		61
43	/////////////////////////////////////////////////////////////////////////////	62	/////////////////////////////////////////////////////////////////////////////
44		63
45	const char *vpn::script_if_up ()	64	static void inline
		65	set_tos (int fd, int &tos_prev, int tos)
		66	{
		67	#if defined(SOL_IP) && defined(IP_TOS)
		68	if (tos_prev == tos)
		69	return;
		70
		71	tos_prev = tos;
		72	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		73	#endif
		74	}
		75
		76	void
		77	vpn::script_init_env ()
46	{	78	{
47	// the tunnel device mtu should be the physical mtu - overhead	79	// the tunnel device mtu should be the physical mtu - overhead
48	// the tricky part is rounding to the cipher key blocksize	80	// the tricky part is rounding to the cipher key blocksize
49	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;	81	int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
50	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	82	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
51	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	83	mtu -= mtu % BLOCK_SIZE (CIPHER); // round
52	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	84	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
53		85
54	char *env;	86	char *env;
55	asprintf (&env, "CONFBASE=%s", confbase);	87	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
56	putenv (env);
57	asprintf (&env, "NODENAME=%s", THISNODE->nodename);
58	putenv (env);
59	asprintf (&env, "NODEID=%d", THISNODE->id);
60	putenv (env);
61	asprintf (&env, "IFNAME=%s", tap->interface ());	88	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
62	putenv (env);	89	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		90	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
63	asprintf (&env, "MTU=%d", mtu);	91	asprintf (&env, "MTU=%d", mtu); putenv (env);
64	putenv (env);	92	asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
65	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	93	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
66	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
67	THISNODE->id & 0xff);
68	putenv (env);
69		94
70	return ::conf.script_if_up ? ::conf.script_if_up : "if-up";	95	conns [THISNODE->id - 1]->script_init_env ("");
		96
		97	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		98	{
		99	char ext[16];
		100	snprintf (ext, 16, "_%d", (*c)->conf->id);
		101	(*c)->script_init_env (ext);
		102	}
		103	}
		104
		105	inline const char *
		106	vpn::script_if_init ()
		107	{
		108	script_init_env ();
		109
		110	return tap->if_up ();
		111	}
		112
		113	inline const char *
		114	vpn::script_if_up ()
		115	{
		116	script_init_env ();
		117
		118	return conf.config_filename (::conf.script_if_up, "if-up");
		119	}
		120
		121	int
		122	vpn::setup_socket (u8 prot, int family, int type, int proto)
		123	{
		124	int fd = socket (family, type, proto);
		125
		126	if (fd < 0)
		127	{
		128	slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
		129	return fd;
		130	}
		131
		132	fcntl (fd, F_SETFL, O_NONBLOCK);
		133	fcntl (fd, F_SETFD, FD_CLOEXEC);
		134
		135	#ifdef SO_MARK
		136	if (::conf.nfmark)
		137	if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
		138	slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
		139	#endif
		140
		141	return fd;
71	}	142	}
72		143
73	int	144	int
74	vpn::setup ()	145	vpn::setup ()
75	{	146	{
		147	int success = 0;
		148
		149	ipv4_tos = -1;
76	udpv4_fd = -1;	150	ipv4_fd = -1;
77		151
78	if (THISNODE->protocols & PROT_UDPv4)	152	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79	{	153	{
80	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	154	ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
81		155
82	if (udpv4_fd < 0)	156	if (ipv4_fd < 0)
83	return -1;	157	return -1;
84		158
85	// standard daemon practise...	159	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
86	{
87	int oval = 1;
88	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89	}
90
91	sockinfo si (THISNODE, PROT_UDPv4);
92
93	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
94	{
95	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
96	exit (1);
97	}
98
99	#ifdef IP_MTU_DISCOVER
100	// this I really consider a linux bug. I am neither connected	160	// this I really consider a linux bug. I am neither connected
101	// nor do I fragment myself. Linux still sets DF and doesn't	161	// nor do I fragment myself. Linux still sets DF and doesn't
102	// fragment for me sometimes.	162	// fragment for me sometimes.
103	{	163	{
104	int oval = IP_PMTUDISC_DONT;	164	int oval = IP_PMTUDISC_DONT;
105	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	165	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		166	}
		167	#endif
		168
		169	sockinfo si (THISNODE, PROT_IPv4);
		170
		171	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		172	{
		173	slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
		174	return -1;
106	}	175	}
107	#endif
108		176
109	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	177	ipv4_ev_watcher.start (ipv4_fd, EV_READ);
		178	++success;
110	}	179	}
		180	else
		181	THISNODE->protocols &= ~PROT_IPv4;
111		182
		183	udpv4_tos = -1;
112	ipv4_fd = -1;	184	udpv4_fd = -1;
113	if (THISNODE->protocols & PROT_IPv4)
114	{
115	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
116		185
		186	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
		187	{
		188	udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		189
117	if (ipv4_fd < 0)	190	if (udpv4_fd < 0)
118	return -1;	191	return -1;
119		192
120	sockinfo si (THISNODE, PROT_IPv4);	193	// standard daemon practise...
121
122	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123	{	194	{
124	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	195	int oval = 1;
125	exit (1);	196	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
126	}	197	}
127		198
128	#ifdef IP_MTU_DISCOVER	199	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	// this I really consider a linux bug. I am neither connected	200	// this I really consider a linux bug. I am neither connected
130	// nor do I fragment myself. Linux still sets DF and doesn't	201	// nor do I fragment myself. Linux still sets DF and doesn't
131	// fragment for me sometimes.	202	// fragment for me sometimes.
132	{	203	{
133	int oval = IP_PMTUDISC_DONT;	204	int oval = IP_PMTUDISC_DONT;
		205	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		206	}
		207	#endif
		208
		209	sockinfo si (THISNODE, PROT_UDPv4);
		210
		211	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		212	{
		213	slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		214	return -1;
		215	}
		216
		217	udpv4_ev_watcher.start (udpv4_fd, EV_READ);
		218	++success;
		219	}
		220	else
		221	THISNODE->protocols &= ~PROT_UDPv4;
		222
		223	icmpv4_tos = -1;
		224	icmpv4_fd = -1;
		225
		226	#if ENABLE_ICMP
		227	if (THISNODE->protocols & PROT_ICMPv4)
		228	{
		229	icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
		230
		231	if (icmpv4_fd < 0)
		232	return -1;
		233
		234	#ifdef ICMP_FILTER
		235	{
		236	icmp_filter oval;
		237	oval.data = 0xffffffff;
		238	if (::conf.icmp_type < 32)
		239	oval.data &= ~(1 << ::conf.icmp_type);
		240
		241	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
		242	}
		243	#endif
		244
		245	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		246	// this I really consider a linux bug. I am neither connected
		247	// nor do I fragment myself. Linux still sets DF and doesn't
		248	// fragment for me sometimes.
		249	{
		250	int oval = IP_PMTUDISC_DONT;
134	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	251	setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		252	}
		253	#endif
		254
		255	sockinfo si (THISNODE, PROT_ICMPv4);
		256
		257	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		258	{
		259	slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		260	return -1;
135	}	261	}
136	#endif
137		262
138	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	263	icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
		264	++success;
139	}	265	}
		266	#endif
		267
		268	tcpv4_fd = -1;
140		269
141	#if ENABLE_TCP	270	#if ENABLE_TCP
142	if (THISNODE->protocols & PROT_TCPv4)	271	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
143	{	272	{
144	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	273	tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
145		274
146	if (tcpv4_fd < 0)	275	if (tcpv4_fd < 0)
147	return -1;	276	return -1;
148		277
149	// standard daemon practise...	278	// standard daemon practise...
154		283
155	sockinfo si (THISNODE, PROT_TCPv4);	284	sockinfo si (THISNODE, PROT_TCPv4);
156		285
157	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	286	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158	{	287	{
159	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	288	slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
160	exit (1);	289	return -1;
161	}	290	}
162		291
163	if (listen (tcpv4_fd, 5))	292	if (listen (tcpv4_fd, 5))
164	{	293	{
165	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	294	slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
166	exit (1);	295	return -1;
		296	}
		297
		298	tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
		299	++success;
		300	}
		301	else
		302	THISNODE->protocols &= ~PROT_TCPv4;
		303	#endif
		304
		305	dnsv4_tos = -1;
		306	dnsv4_fd = -1;
		307
		308	#if ENABLE_DNS
		309	if (THISNODE->protocols & PROT_DNSv4)
		310	{
		311	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		312
		313	dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		314
		315	if (dnsv4_fd < 0)
		316	return -1;
		317
		318	# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		319	// this I really consider a linux bug. I am neither connected
		320	// nor do I fragment myself. Linux still sets DF and doesn't
		321	// fragment for me sometimes.
		322	{
		323	int oval = IP_PMTUDISC_DONT;
		324	setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
167	}	325	}
168
169	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
170	}
171	#endif	326	# endif
		327
		328	// standard daemon practise...
		329	{
		330	int oval = 1;
		331	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		332	}
		333
		334	sockinfo si (THISNODE->dns_hostname,
		335	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		336	PROT_DNSv4);
		337
		338	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
		339	{
		340	slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
		341	return -1;
		342	}
		343
		344	dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
		345	++success;
		346	}
		347	#endif
		348
		349	/////////////////////////////////////////////////////////////////////////////
		350
		351	if (!success)
		352	{
		353	slog (L_ERR, _("no protocols enabled."));
		354	return -1;
		355	}
		356
		357	reconnect_all ();
		358
		359	/////////////////////////////////////////////////////////////////////////////
172		360
173	tap = new tap_device ();	361	tap = new tap_device ();
174	if (!tap) //D this, of course, never catches	362	if (!tap) //D this, of course, never catches
175	{	363	{
176	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	364	slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
177	exit (1);	365	return -1;
178	}	366	}
179		367
180	run_script (run_script_cb (this, &vpn::script_if_up), true);	368	fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
181		369
		370	run_script_cb cb;
		371	cb.set<vpn, &vpn::script_if_init> (this);
		372
		373	if (tap->if_up () &&
		374	!run_script (cb, true))
		375	{
		376	slog (L_ERR, _("interface initialization command '%s' failed."),
		377	tap->if_up ());
		378	return -1;
		379	}
		380
		381	cb.set<vpn, &vpn::script_if_up> (this);
		382	if (!run_script (cb, true))
		383	{
		384	slog (L_ERR, _("if-up command execution failed."));
		385	return -1;
		386	}
		387
182	tap_ev_watcher.start (tap->fd, POLLIN);	388	tap_ev_watcher.start (tap->fd, EV_READ);
183
184	reconnect_all ();
185		389
186	return 0;	390	return 0;
187	}	391	}
188		392
189	// send a vpn packet out to other hosts	393	bool
		394	vpn::drop_privileges ()
		395	{
		396	if (::conf.change_root)
		397	{
		398	if (!strcmp (::conf.change_root, "/"))
		399	{
		400	char dir [L_tmpnam];
		401	if (!tmpnam (dir))
		402	{
		403	slog (L_CRIT, _("unable to create anonymous root path."));
		404	return false;
		405	}
		406
		407	if (mkdir (dir, 0700))
		408	{
		409	slog (L_CRIT, _("unable to crate anonymous root directory."));
		410	return false;
		411	}
		412
		413	if (chdir (dir))
		414	{
		415	slog (L_CRIT, _("unable to change to anonymous root directory."));
		416	return false;
		417	}
		418
		419	if (rmdir (dir))
		420	slog (L_ERR, _("unable to remove anonymous root directory, continuing."));
		421	}
		422	else
		423	{
		424	if (chdir (::conf.change_root))
		425	{
		426	slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root);
		427	return false;
		428	}
		429	}
		430
		431	if (chroot ("."))
		432	{
		433	slog (L_CRIT, _("unable to set new root directory."));
		434	return false;
		435	}
		436
		437	if (chdir ("/"))
		438	{
		439	slog (L_CRIT, _("unable to set cwd to new root directory."));
		440	return false;
		441	}
		442	}
		443
		444	if (::conf.change_gid)
		445	if (setgid (::conf.change_gid))
		446	{
		447	slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid);
		448	return false;
		449	}
		450
		451	if (::conf.change_uid)
		452	if (setuid (::conf.change_uid))
		453	{
		454	slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid);
		455	return false;
		456	}
		457
		458	return true;
		459	}
		460
		461	bool
		462	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		463	{
		464	set_tos (ipv4_fd, ipv4_tos, tos);
		465	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		466
		467	return true;
		468	}
		469
		470	static u16
		471	ipv4_checksum (u16 *data, unsigned int len)
		472	{
		473	// use 32 bit accumulator and fold back carry bits at the end
		474	u32 sum = 0;
		475
		476	while (len > 1)
		477	{
		478	sum += *data++;
		479	len -= 2;
		480	}
		481
		482	// odd byte left?
		483	if (len)
		484	sum += (u8 )data;
		485
		486	// add back carry bits
		487	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		488	sum += (sum >> 16); // carry
		489
		490	return ~sum;
		491	}
		492
		493	#if ENABLE_ICMP
		494	bool
		495	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		496	{
		497	pkt->unshift_hdr (4);
		498
		499	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		500	hdr->type = ::conf.icmp_type;
		501	hdr->code = 255;
		502	hdr->checksum = 0;
		503	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		504
		505	set_tos (icmpv4_fd, icmpv4_tos, tos);
		506	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		507
		508	return true;
		509	}
		510	#endif
		511
		512	bool
		513	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		514	{
		515	set_tos (udpv4_fd, udpv4_tos, tos);
		516	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		517
		518	return true;
		519	}
		520
190	void	521	void
191	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	522	vpn::inject_data_packet (tap_packet *pkt, int dst)
192	{	523	{
193	switch (si.prot)	524	if (dst)
194	{
195	case PROT_IPv4:
196	send_ipv4_packet (pkt, si, tos);
197	break;
198
199	case PROT_UDPv4:
200	send_udpv4_packet (pkt, si, tos);
201	break;
202
203	#if ENABLE_TCP
204	case PROT_TCPv4:
205	send_tcpv4_packet (pkt, si, tos);
206	break;
207	#endif
208
209	default:
210	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211	abort ();
212	}	525	{
213	}	526	// unicast
214		527	if (dst != THISNODE->id)
215	void	528	conns[dst - 1]->inject_data_packet (pkt);
216	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	529	}
217	{	530	else
218	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	531	{
219	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	532	// broadcast, this is ugly, but due to the security policy
220	}	533	// we have to connect to all hosts...
221		534	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
222	void	535	if ((*c)->conf != THISNODE)
223	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	536	(*c)->inject_data_packet (pkt);
224	{	537	}
225	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
226	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
227	}	538	}
228		539
229	void	540	void
230	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	541	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
231	{	542	{
232	unsigned int src = pkt->src ();	543	unsigned int src = pkt->src ();
233	unsigned int dst = pkt->dst ();	544	unsigned int dst = pkt->dst ();
234		545
235	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),	546	slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
236	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);	547	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
237		548
238	if (src == 0 \|\| src > conns.size ()	549	if (src == 0 \|\| src > conns.size ()
239	\|\| dst > conns.size ()	550	\|\| dst > conns.size ()
240	\|\| pkt->typ () >= vpn_packet::PT_MAX)	551	\|\| pkt->typ () >= vpn_packet::PT_MAX)
241	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	552	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
242	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243	else if (dst > conns.size ())
244	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
245	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	553	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
246	else	554	else
247	{	555	{
248	connection *c = conns[src - 1];	556	connection *c = conns[src - 1];
249		557
250	if (dst == 0 && !THISNODE->routerprio)	558	if (dst == 0)
251	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	559	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
252	c->conf->nodename, (const char *)rsi);	560	c->conf->nodename, (const char *)rsi);
253	else if (dst != 0 && dst != THISNODE->id)	561	else if (dst != THISNODE->id)
254	{	562	{
255	if (THISNODE->routerprio)	563	if (THISNODE->routerprio)
256	// the tos setting gets lost here. who cares.	564	// the tos setting gets lost here. who cares.
257	conns[dst - 1]->inject_vpn_packet (pkt);	565	conns[dst - 1]->inject_vpn_packet (pkt);
258	else	566	else
259	slog (L_WARN,	567	slog (L_WARN,
260	_("%s(%s): forwarding request (=> %s), but we are no router"),	568	_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
261	c->conf->nodename, (const char *)rsi,	569	c->conf->nodename, (const char *)rsi,
262	conns[dst - 1]->conf->nodename);	570	conns[dst - 1]->conf->nodename);
263	}	571	}
264	else	572	else
265	c->recv_vpn_packet (pkt, rsi);	573	c->recv_vpn_packet (pkt, rsi);
266	}	574	}
267	}	575	}
268		576
269	void	577	bool
270	vpn::udpv4_ev (io_watcher &w, short revents)	578	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
271	{	579	{
272	if (revents & (POLLIN \| POLLERR))	580	switch (si.prot)
		581	{
		582	case PROT_IPv4:
		583	return send_ipv4_packet (pkt, si, tos);
		584
		585	case PROT_UDPv4:
		586	return send_udpv4_packet (pkt, si, tos);
		587
		588	#if ENABLE_TCP
		589	case PROT_TCPv4:
		590	return send_tcpv4_packet (pkt, si, tos);
		591	#endif
		592	#if ENABLE_ICMP
		593	case PROT_ICMPv4:
		594	return send_icmpv4_packet (pkt, si, tos);
		595	#endif
		596	#if ENABLE_DNS
		597	case PROT_DNSv4:
		598	return send_dnsv4_packet (pkt, si, tos);
		599	#endif
		600	default:
		601	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
		602	}
		603
		604	return false;
		605	}
		606
		607	inline void
		608	vpn::ipv4_ev (ev::io &w, int revents)
		609	{
		610	if (revents & EV_READ)
273	{	611	{
274	vpn_packet *pkt = new vpn_packet;	612	vpn_packet *pkt = new vpn_packet;
275	struct sockaddr_in sa;	613	struct sockaddr_in sa;
276	socklen_t sa_len = sizeof (sa);	614	socklen_t sa_len = sizeof (sa);
277	int len;	615	int len;
278		616
279	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	617	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
280		618
281	sockinfo si(sa, PROT_UDPv4);	619	sockinfo si(sa, PROT_IPv4);
282		620
283	if (len > 0)	621	if (len > 0)
284	{	622	{
285	pkt->len = len;	623	pkt->len = len;
286		624
		625	// raw sockets deliver the ipv4 header, but don't expect it on sends
		626	pkt->skip_hdr (pkt->ipv4_hdr_len ());
		627
287	recv_vpn_packet (pkt, si);	628	recv_vpn_packet (pkt, si);
288	}	629	}
289	else	630	else
290	{	631	{
291	// probably ECONNRESET or somesuch	632	// probably ECONNRESET or somesuch
292	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));	633	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
293	}	634	}
294		635
295	delete pkt;	636	delete pkt;
296	}	637	}
297	else if (revents & POLLHUP)
298	{
299	// this cannot ;) happen on udp sockets
300	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
301	exit (1);
302	}
303	else	638	else
304	{	639	{
305	slog (L_ERR,	640	slog (L_ERR,
306	_("FATAL: unknown revents %08x in socket, terminating\n"),	641	_("FATAL: unknown revents %08x in socket, exiting.\n"),
307	revents);	642	revents);
308	exit (1);	643	exit (EXIT_FAILURE);
309	}	644	}
310	}	645	}
311		646
312	void	647	#if ENABLE_ICMP
		648	inline void
313	vpn::ipv4_ev (io_watcher &w, short revents)	649	vpn::icmpv4_ev (ev::io &w, int revents)
314	{	650	{
315	if (revents & (POLLIN \| POLLERR))	651	if (revents & EV_READ)
316	{	652	{
317	vpn_packet *pkt = new vpn_packet;	653	vpn_packet *pkt = new vpn_packet;
318	struct sockaddr_in sa;	654	struct sockaddr_in sa;
319	socklen_t sa_len = sizeof (sa);	655	socklen_t sa_len = sizeof (sa);
320	int len;	656	int len;
321		657
322	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	658	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
323		659
324	sockinfo si(sa, PROT_IPv4);	660	sockinfo si(sa, PROT_ICMPv4);
325		661
326	if (len > 0)	662	if (len > 0)
327	{	663	{
328	pkt->len = len;	664	pkt->len = len;
329		665
		666	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		667
		668	if (hdr->type == ::conf.icmp_type
		669	&& hdr->code == 255)
		670	{
330	// raw sockets deliver the ipv4, but don't expect it on sends	671	// raw sockets deliver the ipv4, but don't expect it on sends
331	// this is slow, but...	672	// this is slow, but...
332	pkt->skip_hdr (IP_OVERHEAD);	673	pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
		674
		675	recv_vpn_packet (pkt, si);
		676	}
		677	}
		678	else
		679	{
		680	// probably ECONNRESET or somesuch
		681	slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
		682	}
		683
		684	delete pkt;
		685	}
		686	else
		687	{
		688	slog (L_ERR,
		689	_("FATAL: unknown revents %08x in socket, exiting.\n"),
		690	revents);
		691	exit (EXIT_FAILURE);
		692	}
		693	}
		694	#endif
		695
		696	inline void
		697	vpn::udpv4_ev (ev::io &w, int revents)
		698	{
		699	if (revents & EV_READ)
		700	{
		701	vpn_packet *pkt = new vpn_packet;
		702	struct sockaddr_in sa;
		703	socklen_t sa_len = sizeof (sa);
		704	int len;
		705
		706	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
		707
		708	sockinfo si(sa, PROT_UDPv4);
		709
		710	if (len > 0)
		711	{
		712	pkt->len = len;
333		713
334	recv_vpn_packet (pkt, si);	714	recv_vpn_packet (pkt, si);
335	}	715	}
336	else	716	else
337	{	717	{
338	// probably ECONNRESET or somesuch	718	// probably ECONNRESET or somesuch
339	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	719	slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
340	}	720	}
341		721
342	delete pkt;	722	delete pkt;
343	}	723	}
344	else if (revents & POLLHUP)
345	{
346	// this cannot ;) happen on udp sockets
347	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
348	exit (1);
349	}
350	else	724	else
351	{	725	{
352	slog (L_ERR,	726	slog (L_ERR,
353	_("FATAL: unknown revents %08x in socket, terminating\n"),	727	_("FATAL: unknown revents %08x in socket, exiting.\n"),
354	revents);	728	revents);
355	exit (1);	729	exit (EXIT_FAILURE);
356	}	730	}
357	}	731	}
358		732
359	void	733	inline void
360	vpn::tap_ev (io_watcher &w, short revents)	734	vpn::tap_ev (ev::io &w, int revents)
361	{	735	{
362	if (revents & POLLIN)	736	if (revents & EV_READ)
363	{	737	{
364	/* process data */	738	/* process data */
365	tap_packet *pkt;	739	tap_packet *pkt;
366		740
367	pkt = tap->recv ();	741	pkt = tap->recv ();
368		742
		743	if (!pkt)
		744	return;
		745
		746	if (pkt->len > 14)
		747	{
369	int dst = mac2id (pkt->dst);	748	int dst = mac2id (pkt->dst);
370	int src = mac2id (pkt->src);	749	int src = mac2id (pkt->src);
371		750
372	if (src != THISNODE->id)	751	if (src != THISNODE->id)
373	{
374	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
375	exit (1);
376	}
377
378	if (dst == THISNODE->id)
379	{
380	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
381	exit (1);
382	}
383
384	if (dst > conns.size ())
385	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
386	else
387	{
388	if (dst)
389	{	752	{
390	// unicast	753	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
391	if (dst != THISNODE->id)	754	exit (EXIT_FAILURE);
392	conns[dst - 1]->inject_data_packet (pkt);
393	}	755	}
		756
		757	if (dst == THISNODE->id)
		758	{
		759	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		760	exit (EXIT_FAILURE);
		761	}
		762
		763	if (dst > conns.size ())
		764	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
394	else	765	else
395	{
396	// broadcast, first check router, then self, then english
397	connection *router = find_router ();
398
399	if (router)
400	router->inject_data_packet (pkt, true);	766	inject_data_packet (pkt, dst);
401	else
402	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
403	if ((*c)->conf != THISNODE)
404	(*c)->inject_data_packet (pkt);
405	}
406	}	767	}
407		768
408	delete pkt;	769	delete pkt;
409	}
410	else if (revents & (POLLHUP \| POLLERR))
411	{
412	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
413	exit (1);
414	}	770	}
415	else	771	else
416	abort ();	772	abort ();
417	}	773	}
418		774
419	void	775	inline void
420	vpn::event_cb (time_watcher &w)	776	vpn::event_cb (ev::timer &w, int)
421	{	777	{
422	if (events)	778	if (events)
423	{	779	{
424	if (events & EVENT_SHUTDOWN)	780	if (events & EVENT_SHUTDOWN)
425	{	781	{
426	slog (L_INFO, _("preparing shutdown..."));	782	slog (L_INFO, _("preparing shutdown..."));
427		783
428	shutdown_all ();	784	shutdown_all ();
429
430	remove_pid (pidfilename);	785	remove_pid (conf.pidfilename);
431
432	slog (L_INFO, _("terminating"));	786	slog (L_INFO, _("exiting."));
433		787	exit (EXIT_SUCCESS);
434	exit (0);
435	}	788	}
436		789
437	if (events & EVENT_RECONNECT)	790	if (events & EVENT_RECONNECT)
438	{	791	{
439	slog (L_INFO, _("forced reconnect"));	792	slog (L_INFO, _("forced reconnect."));
440		793
441	reconnect_all ();	794	reconnect_all ();
442	}	795	}
443		796
444	events = 0;	797	events = 0;
445	}	798	}
446
447	w.at = TSTAMP_CANCEL;
448	}	799	}
449		800
450	void	801	void
451	vpn::shutdown_all ()	802	vpn::shutdown_all ()
452	{	803	{
…		…
462		813
463	conns.clear ();	814	conns.clear ();
464		815
465	connection_init ();	816	connection_init ();
466		817
467	for (configuration::node_vector::iterator i = conf.nodes.begin ();	818	for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
468	i != conf.nodes.end (); ++i)	819	conns.push_back (new connection (this, *i));
469	{
470	connection *conn = new connection (this);
471		820
472	conn->conf = *i;	821	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
473	conns.push_back (conn);
474
475	conn->establish_connection ();	822	(*c)->establish_connection ();
476	}
477	}	823	}
478		824
479	connection *vpn::find_router ()	825	bool
		826	vpn::can_direct (conf_node src, conf_node dst) const
480	{	827	{
481	u32 prio = 0;	828	return src != dst
		829	&& src->may_direct (dst)
		830	&& dst->may_direct (src)
		831	&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
		832	\|\| (src->protocols & dst->connectable_protocols ()));
		833	}
		834
		835	// only works for indirect and routed connections: find a router
		836	// from THISNODE to dst
		837	connection *
		838	vpn::find_router_for (const connection *dst)
		839	{
482	connection *router = 0;	840	connection *router = 0;
483		841
		842	// first try to find a router with a direct connection, route there
		843	// regardless of any other considerations.
		844	{
		845	u32 prio = 1;
		846
		847	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		848	{
		849	connection c = i;
		850
		851	if (c->conf->routerprio > prio
		852	&& c->conf != THISNODE
		853	&& can_direct (c->conf, dst->conf)
		854	&& c->ictx && c->octx)
		855	{
		856	prio = c->conf->routerprio;
		857	router = c;
		858	}
		859	}
		860	}
		861
		862	if (router)
		863	return router;
		864
		865	// second try find the router with the highest priority, higher than ours
		866	{
		867	u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
		868
		869	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
		870	{
		871	connection c = i;
		872
		873	if (c->conf->routerprio > prio
		874	&& c != dst
		875	&& c->conf != THISNODE
		876	&& c->ictx && c->octx)
		877	{
		878	prio = c->conf->routerprio;
		879	router = c;
		880	}
		881	}
		882	}
		883
		884	return router;
		885	}
		886
		887	void
		888	vpn::connection_established (connection *c)
		889	{
484	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	890	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
485	{	891	{
486	connection c = i;	892	connection o = i;
487		893
488	if (c->conf->routerprio > prio	894	if (o->si.valid ()
489	&& c->connectmode == conf_node::C_ALWAYS	895	&& c->si != o->si
490	&& c->conf != THISNODE	896	&& c == find_router_for (o)
491	&& c->ictx && c->octx)	897	&& !can_direct (THISNODE, o->conf))
492	{
493	prio = c->conf->routerprio;
494	router = c;
495	}	898	{
		899	slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
		900	o->conf->nodename, c->conf->nodename);
		901	o->rekey ();
		902	}
496	}	903	}
497
498	return router;
499	}	904	}
500		905
501	void vpn::connect_request (int id)	906	void
		907	vpn::send_connect_request (connection *c)
502	{	908	{
503	connection *c = find_router ();	909	connection *r = find_router_for (c);
504		910
505	if (c)	911	if (r)
		912	{
		913	slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
		914	c->conf->nodename, r->conf->nodename);
506	c->connect_request (id);	915	r->send_connect_request (c->conf->id);
507	//else // does not work, because all others must connect to the same router	916	}
508	// // no router found, aggressively connect to all routers	917	else
509	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	918	slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
510	// if ((*i)->conf->routerprio)	919	c->conf->nodename);
511	// (*i)->establish_connection ();
512	}	920	}
513		921
514	void	922	void
515	connection::dump_status ()	923	connection::dump_status ()
516	{	924	{
517	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);	925	slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
518	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),	926	slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
519	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);	927	connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
520	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),	928	slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
521	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);	929	(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
522	slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
523	(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
524	}	930	}
525		931
526	void	932	void
527	vpn::dump_status ()	933	vpn::dump_status ()
528	{	934	{
529	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);	935	slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
530		936
531	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)	937	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
532	(*c)->dump_status ();	938	(*c)->dump_status ();
533		939
534	slog (L_NOTICE, _("END status dump"));	940	slog (L_NOTICE, _("END status dump"));
535	}	941	}
536		942
537	vpn::vpn (void)	943	vpn::vpn (void)
538	: event(this, &vpn::event_cb)	944	{
		945	event .set<vpn, &vpn::event_cb > (this);
539	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	946	udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
540	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	947	ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
541	, tap_ev_watcher (this, &vpn::tap_ev)
542	#if ENABLE_TCP	948	#if ENABLE_TCP
543	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	949	tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
544	#endif	950	#endif
545	{	951	#if ENABLE_ICMP
		952	icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
		953	#endif
		954	#if ENABLE_DNS
		955	dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
		956	#endif
		957	tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
546	}	958	}
547		959
548	vpn::~vpn ()	960	vpn::~vpn ()
549	{	961	{
550	}	962	}

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Comparing gvpe/src/vpn.C (file contents): Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.67 by root, Fri Oct 11 04:07:24 2013 UTC

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Comparing gvpe/src/vpn.C (file contents):
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.67 by root, Fri Oct 11 04:07:24 2013 UTC