514 lines
12 KiB
C
514 lines
12 KiB
C
/*
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tincd.c -- the main file for tincd
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Copyright (C) 1998-2005 Ivo Timmermans <ivo@tinc-vpn.org>
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2000-2005 Guus Sliepen <guus@tinc-vpn.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#include "system.h"
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/* Darwin (MacOS/X) needs the following definition... */
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#ifndef _P1003_1B_VISIBLE
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#define _P1003_1B_VISIBLE
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include <openssl/rand.h>
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#include <openssl/rsa.h>
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#include <openssl/pem.h>
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#include <openssl/evp.h>
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#include <openssl/engine.h>
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#include <lzo1x.h>
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#include <getopt.h>
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#include "pidfile.h"
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#include "conf.h"
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#include "device.h"
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#include "logger.h"
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#include "net.h"
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#include "netutl.h"
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#include "process.h"
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#include "protocol.h"
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#include "utils.h"
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#include "xalloc.h"
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/* The name this program was run with. */
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char *program_name = NULL;
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/* If nonzero, display usage information and exit. */
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bool show_help = false;
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/* If nonzero, print the version on standard output and exit. */
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bool show_version = false;
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/* If nonzero, it will attempt to kill a running tincd and exit. */
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int kill_tincd = 0;
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/* If nonzero, generate public/private keypair for this host/net. */
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int generate_keys = 0;
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/* If nonzero, use null ciphers and skip all key exchanges. */
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bool bypass_security = false;
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/* If nonzero, disable swapping for this process. */
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bool do_mlock = false;
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/* If nonzero, write log entries to a separate file. */
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bool use_logfile = false;
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char *identname = NULL; /* program name for syslog */
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char *pidfilename = NULL; /* pid file location */
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char *logfilename = NULL; /* log file location */
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char **g_argv; /* a copy of the cmdline arguments */
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static int status;
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static struct option const long_options[] = {
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{"config", required_argument, NULL, 'c'},
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{"kill", optional_argument, NULL, 'k'},
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{"net", required_argument, NULL, 'n'},
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{"help", no_argument, NULL, 1},
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{"version", no_argument, NULL, 2},
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{"no-detach", no_argument, NULL, 'D'},
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{"generate-keys", optional_argument, NULL, 'K'},
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{"debug", optional_argument, NULL, 'd'},
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{"bypass-security", no_argument, NULL, 3},
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{"mlock", no_argument, NULL, 'L'},
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{"logfile", optional_argument, NULL, 4},
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{"pidfile", required_argument, NULL, 5},
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{NULL, 0, NULL, 0}
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};
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#ifdef HAVE_MINGW
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static struct WSAData wsa_state;
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#endif
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static void usage(bool status)
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{
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if(status)
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fprintf(stderr, _("Try `%s --help\' for more information.\n"),
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program_name);
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else {
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printf(_("Usage: %s [option]...\n\n"), program_name);
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printf(_(" -c, --config=DIR Read configuration options from DIR.\n"
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" -D, --no-detach Don't fork and detach.\n"
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" -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
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" -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
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" -n, --net=NETNAME Connect to net NETNAME.\n"
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" -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
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" -L, --mlock Lock tinc into main memory.\n"
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" --logfile[=FILENAME] Write log entries to a logfile.\n"
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" --pidfile=FILENAME Write PID to FILENAME.\n"
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" --help Display this help and exit.\n"
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" --version Output version information and exit.\n\n"));
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printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
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}
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}
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static bool parse_options(int argc, char **argv)
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{
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int r;
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int option_index = 0;
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while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
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switch (r) {
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case 0: /* long option */
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break;
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case 'c': /* config file */
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confbase = xstrdup(optarg);
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break;
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case 'D': /* no detach */
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do_detach = false;
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break;
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case 'L': /* no detach */
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do_mlock = true;
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break;
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case 'd': /* inc debug level */
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if(optarg)
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debug_level = atoi(optarg);
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else
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debug_level++;
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break;
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case 'k': /* kill old tincds */
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#ifndef HAVE_MINGW
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if(optarg) {
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if(!strcasecmp(optarg, "HUP"))
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kill_tincd = SIGHUP;
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else if(!strcasecmp(optarg, "TERM"))
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kill_tincd = SIGTERM;
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else if(!strcasecmp(optarg, "KILL"))
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kill_tincd = SIGKILL;
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else if(!strcasecmp(optarg, "USR1"))
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kill_tincd = SIGUSR1;
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else if(!strcasecmp(optarg, "USR2"))
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kill_tincd = SIGUSR2;
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else if(!strcasecmp(optarg, "WINCH"))
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kill_tincd = SIGWINCH;
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else if(!strcasecmp(optarg, "INT"))
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kill_tincd = SIGINT;
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else if(!strcasecmp(optarg, "ALRM"))
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kill_tincd = SIGALRM;
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else {
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kill_tincd = atoi(optarg);
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if(!kill_tincd) {
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fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
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optarg);
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usage(true);
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return false;
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}
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}
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} else
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kill_tincd = SIGTERM;
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#else
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kill_tincd = 1;
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#endif
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break;
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case 'n': /* net name given */
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netname = xstrdup(optarg);
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break;
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case 'K': /* generate public/private keypair */
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if(optarg) {
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generate_keys = atoi(optarg);
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if(generate_keys < 512) {
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fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
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optarg);
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usage(true);
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return false;
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}
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generate_keys &= ~7; /* Round it to bytes */
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} else
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generate_keys = 1024;
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break;
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case 1: /* show help */
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show_help = true;
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break;
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case 2: /* show version */
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show_version = true;
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break;
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case 3: /* bypass security */
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bypass_security = true;
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break;
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case 4: /* write log entries to a file */
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use_logfile = true;
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if(optarg)
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logfilename = xstrdup(optarg);
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break;
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case 5: /* write PID to a file */
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pidfilename = xstrdup(optarg);
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break;
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case '?':
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usage(true);
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return false;
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default:
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break;
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}
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}
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return true;
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}
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/* This function prettyprints the key generation process */
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static void indicator(int a, int b, void *p)
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{
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switch (a) {
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case 0:
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fprintf(stderr, ".");
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break;
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case 1:
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fprintf(stderr, "+");
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break;
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case 2:
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fprintf(stderr, "-");
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break;
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case 3:
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switch (b) {
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case 0:
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fprintf(stderr, " p\n");
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break;
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case 1:
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fprintf(stderr, " q\n");
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break;
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default:
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fprintf(stderr, "?");
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}
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break;
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default:
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fprintf(stderr, "?");
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}
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}
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/*
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Generate a public/private RSA keypair, and ask for a file to store
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them in.
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*/
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static bool keygen(int bits)
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{
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RSA *rsa_key;
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FILE *f;
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char *name = NULL;
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char *filename;
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fprintf(stderr, _("Generating %d bits keys:\n"), bits);
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rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
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if(!rsa_key) {
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fprintf(stderr, _("Error during key generation!\n"));
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return false;
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} else
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fprintf(stderr, _("Done.\n"));
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asprintf(&filename, "%s/rsa_key.priv", confbase);
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f = ask_and_open(filename, _("private RSA key"), "a");
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if(!f)
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return false;
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#ifdef HAVE_FCHMOD
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/* Make it unreadable for others. */
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fchmod(fileno(f), 0600);
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#endif
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if(ftell(f))
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fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
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PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
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fclose(f);
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free(filename);
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get_config_string(lookup_config(config_tree, "Name"), &name);
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if(name)
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asprintf(&filename, "%s/hosts/%s", confbase, name);
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else
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asprintf(&filename, "%s/rsa_key.pub", confbase);
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f = ask_and_open(filename, _("public RSA key"), "a");
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if(!f)
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return false;
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if(ftell(f))
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fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
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PEM_write_RSAPublicKey(f, rsa_key);
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fclose(f);
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free(filename);
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return true;
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}
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/*
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Set all files and paths according to netname
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*/
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static void make_names(void)
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{
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#ifdef HAVE_MINGW
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HKEY key;
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char installdir[1024] = "";
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long len = sizeof(installdir);
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#endif
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if(netname)
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asprintf(&identname, "tinc.%s", netname);
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else
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identname = xstrdup("tinc");
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#ifdef HAVE_MINGW
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if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
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if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
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if(!logfilename)
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asprintf(&logfilename, "%s/log/%s.log", identname);
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if(!confbase) {
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if(netname)
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asprintf(&confbase, "%s/%s", installdir, netname);
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else
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asprintf(&confbase, "%s", installdir);
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}
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}
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RegCloseKey(key);
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if(*installdir)
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return;
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}
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#endif
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if(!pidfilename)
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asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
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if(!logfilename)
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asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
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if(netname) {
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if(!confbase)
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asprintf(&confbase, CONFDIR "/tinc/%s", netname);
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else
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logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
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} else {
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if(!confbase)
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asprintf(&confbase, CONFDIR "/tinc");
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}
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}
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int main(int argc, char **argv)
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{
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program_name = argv[0];
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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if(!parse_options(argc, argv))
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return 1;
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make_names();
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if(show_version) {
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printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
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VERSION, __DATE__, __TIME__, PROT_CURRENT);
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printf(_("Copyright (C) 1998-2005 Ivo Timmermans, Guus Sliepen and others.\n"
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"See the AUTHORS file for a complete list.\n\n"
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"tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
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"and you are welcome to redistribute it under certain conditions;\n"
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"see the file COPYING for details.\n"));
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return 0;
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}
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if(show_help) {
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usage(false);
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return 0;
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}
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if(kill_tincd)
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return !kill_other(kill_tincd);
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openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
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/* Lock all pages into memory if requested */
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if(do_mlock)
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#ifdef HAVE_MLOCKALL
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if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
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logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
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strerror(errno));
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#else
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{
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logger(LOG_ERR, _("mlockall() not supported on this platform!"));
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#endif
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return -1;
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}
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g_argv = argv;
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init_configuration(&config_tree);
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/* Slllluuuuuuurrrrp! */
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RAND_load_file("/dev/urandom", 1024);
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ENGINE_load_builtin_engines();
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ENGINE_register_all_complete();
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OpenSSL_add_all_algorithms();
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if(generate_keys) {
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read_server_config();
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return !keygen(generate_keys);
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}
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if(!read_server_config())
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return 1;
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if(lzo_init() != LZO_E_OK) {
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logger(LOG_ERR, _("Error initializing LZO compressor!"));
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return 1;
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}
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#ifdef HAVE_MINGW
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if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
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logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
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return 1;
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}
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if(!do_detach || !init_service())
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return main2(argc, argv);
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else
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return 1;
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}
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int main2(int argc, char **argv)
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{
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#endif
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if(!detach())
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return 1;
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/* Setup sockets and open device. */
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if(!setup_network_connections())
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goto end;
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/* Start main loop. It only exits when tinc is killed. */
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status = main_loop();
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/* Shutdown properly. */
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close_network_connections();
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ifdebug(CONNECTIONS)
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dump_device_stats();
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end:
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logger(LOG_NOTICE, _("Terminating"));
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#ifndef HAVE_MINGW
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remove_pid(pidfilename);
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#endif
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return status;
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}
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