/*
tincd.c -- the main file for tincd
Copyright (C) 1998,1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>
2000 Guus Sliepen <guus@sliepen.warande.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: tincd.c,v 1.10.4.32 2000/11/20 22:13:14 guus Exp $
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <termios.h>
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_OPENSSL_RAND_H
# include <openssl/rand.h>
#else
# include <rand.h>
#endif
#ifdef HAVE_OPENSSL_RSA_H
# include <openssl/rsa.h>
#else
# include <rsa.h>
#endif
#ifdef HAVE_OPENSSL_ERR_H
# include <openssl/err.h>
#else
# include <err.h>
#endif
#include <utils.h>
#include <xalloc.h>
#include "conf.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "subnet.h"
#include "system.h"
/* The name this program was run with. */
char *program_name;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output and exit. */
static int show_version;
/* If nonzero, it will attempt to kill a running tincd and exit. */
static int kill_tincd = 0;
/* If zero, don't detach from the terminal. */
extern int do_detach;
/* If nonzero, generate public/private keypair for this host/net. */
static int generate_keys = 0;
char *identname; /* program name for syslog */
char *pidfilename; /* pid file location */
char **g_argv; /* a copy of the cmdline arguments */
char **environment; /* A pointer to the environment on
startup */
void cleanup_and_exit(int);
int kill_other(void);
void make_names(void);
int write_pidfile(void);
static struct option const long_options[] =
{
{ "config", required_argument, NULL, 'c' },
{ "kill", no_argument, NULL, 'k' },
{ "net", required_argument, NULL, 'n' },
{ "help", no_argument, &show_help, 1 },
{ "version", no_argument, &show_version, 1 },
{ "no-detach", no_argument, &do_detach, 0 },
{ "generate-keys", optional_argument, NULL, 'K'},
{ NULL, 0, NULL, 0 }
};
static void
usage(int status)
{
if(status != 0)
fprintf(stderr, _("Try `%s --help\' for more information.\n"), program_name);
else
{
printf(_("Usage: %s [option]...\n\n"), program_name);
printf(_(" -c, --config=DIR Read configuration options from DIR.\n"
" -D, --no-detach Don't fork and detach.\n"
" -d Increase debug level.\n"
" -k, --kill Attempt to kill a running tincd and exit.\n"
" -n, --net=NETNAME Connect to net NETNAME.\n"));
printf(_(" -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
" --help Display this help and exit.\n"
" --version Output version information and exit.\n\n"));
printf(_("Report bugs to tinc@nl.linux.org.\n"));
}
exit(status);
}
void
parse_options(int argc, char **argv, char **envp)
{
int r;
int option_index = 0;
while((r = getopt_long(argc, argv, "c:Ddkn:K::", long_options, &option_index)) != EOF)
{
switch(r)
{
case 0: /* long option */
break;
case 'c': /* config file */
confbase = xmalloc(strlen(optarg)+1);
strcpy(confbase, optarg);
break;
case 'D': /* no detach */
do_detach = 0;
break;
case 'd': /* inc debug level */
debug_lvl++;
break;
case 'k': /* kill old tincds */
kill_tincd = 1;
break;
case 'n': /* net name given */
netname = xmalloc(strlen(optarg)+1);
strcpy(netname, optarg);
break;
case 'K': /* generate public/private keypair */
if(optarg)
{
generate_keys = atoi(optarg);
if(generate_keys < 512)
{
fprintf(stderr, _("Invalid argument! BITS must be a number equal to or greater than 512.\n"));
usage(1);
}
generate_keys &= ~7; /* Round it to bytes */
}
else
generate_keys = 1024;
break;
case '?':
usage(1);
default:
break;
}
}
}
/* This function prettyprints the key generation process */
void indicator(int a, int b, void *p)
{
switch(a)
{
case 0:
fprintf(stderr, ".");
break;
case 1:
fprintf(stderr, "+");
break;
case 2:
fprintf(stderr, "-");
break;
case 3:
switch(b)
{
case 0:
fprintf(stderr, " p\n");
break;
case 1:
fprintf(stderr, " q\n");
break;
default:
fprintf(stderr, "?");
}
break;
default:
fprintf(stderr, "?");
}
}
/* Generate a public/private RSA keypair, and possibly store it into the configuration file. */
int keygen(int bits)
{
RSA *rsa_key;
fprintf(stderr, _("Generating %d bits keys:\n"), bits);
rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
if(!rsa_key)
{
fprintf(stderr, _("Error during key generation!"));
return -1;
}
else
fprintf(stderr, _("Done.\n"));
fprintf(stderr, _("Please copy the private key to tinc.conf and the\npublic key to your host configuration file:\n\n"));
printf("PublicKey = %s\n", BN_bn2hex(rsa_key->n));
printf("PrivateKey = %s\n", BN_bn2hex(rsa_key->d));
fflush(stdin);
return 0;
}
/*
Set all files and paths according to netname
*/
void make_names(void)
{
if(netname)
{
if(!pidfilename)
asprintf(&pidfilename, "/var/run/tinc.%s.pid", netname);
if(!confbase)
asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
else
fprintf(stderr, _("Both netname and configuration directory given, using the latter...\n"));
if(!identname)
asprintf(&identname, "tinc.%s", netname);
}
else
{
if(!pidfilename)
pidfilename = "/var/run/tinc.pid";
if(!confbase)
asprintf(&confbase, "%s/tinc", CONFDIR);
if(!identname)
identname = "tinc";
}
}
int
main(int argc, char **argv, char **envp)
{
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
/* Do some intl stuff right now */
unknown = _("unknown");
environment = envp;
parse_options(argc, argv, envp);
if(show_version)
{
printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE, VERSION, __DATE__, __TIME__, PROT_CURRENT);
printf(_("Copyright (C) 1998,1999,2000 Ivo Timmermans, Guus Sliepen and others.\n"
"See the AUTHORS file for a complete list.\n\n"
"tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
"and you are welcome to redistribute it under certain conditions;\n"
"see the file COPYING for details.\n"));
return 0;
}
if(show_help)
usage(0);
if(geteuid())
{
fprintf(stderr, _("You must be root to run this program. Sorry.\n"));
return 1;
}
g_argv = argv;
make_names();
/* Slllluuuuuuurrrrp! */
RAND_load_file("/dev/urandom", 1024);
if(generate_keys)
exit(keygen(generate_keys));
if(kill_tincd)
exit(kill_other());
if(read_server_config())
return 1;
init_processes();
if(detach())
exit(0);
if(debug_lvl >= DEBUG_ERROR)
ERR_load_crypto_strings();
for(;;)
{
if(!setup_network_connections())
{
main_loop();
cleanup_and_exit(1);
}
syslog(LOG_ERR, _("Unrecoverable error"));
cp_trace();
if(do_detach)
{
syslog(LOG_NOTICE, _("Restarting in %d seconds!"), MAXTIMEOUT);
sleep(MAXTIMEOUT);
}
else
{
syslog(LOG_ERR, _("Not restarting."));
exit(0);
}
}
}