tinc/src/tincd.c

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/*
tincd.c -- the main file for tincd
Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>
2000-2003 Guus Sliepen <guus@sliepen.eu.org>
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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.
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$Id: tincd.c,v 1.10.4.82 2003/08/03 09:08:52 guus Exp $
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*/
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#include "system.h"
/* Darwin (MacOS/X) needs the following definition... */
#ifndef _P1003_1B_VISIBLE
#define _P1003_1B_VISIBLE
#endif
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#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
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#endif
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#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
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#include <openssl/evp.h>
#include <lzo1x.h>
#include <getopt.h>
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#include "conf.h"
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#include "device.h"
#include "logger.h"
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#include "net.h"
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#include "netutl.h"
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#include "process.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
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/* The name this program was run with. */
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;
/* If nonzero, use null ciphers and skip all key exchanges. */
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bool bypass_security = false;
/* If nonzero, disable swapping for this process. */
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bool do_mlock = false;
/* If nonzero, write log entries to a separate file. */
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bool use_logfile = false;
char *identname = NULL; /* program name for syslog */
char *pidfilename = NULL; /* pid file location */
char *logfilename = NULL; /* log file location */
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char **g_argv; /* a copy of the cmdline arguments */
int exitstatus = 0;
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static struct option const long_options[] = {
{"config", required_argument, NULL, 'c'},
{"kill", optional_argument, NULL, 'k'},
{"net", required_argument, NULL, 'n'},
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{"help", no_argument, NULL, 1},
{"version", no_argument, NULL, 2},
{"no-detach", no_argument, NULL, 'D'},
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{"generate-keys", optional_argument, NULL, 'K'},
{"debug", optional_argument, NULL, 'd'},
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{"bypass-security", no_argument, NULL, 3},
{"mlock", no_argument, NULL, 'L'},
{"logfile", optional_argument, NULL, 4},
{"pidfile", required_argument, NULL, 5},
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{NULL, 0, NULL, 0}
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};
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#ifdef HAVE_MINGW
static struct WSAData wsa_state;
#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"),
program_name);
else {
printf(_("Usage: %s [option]...\n\n"), program_name);
printf(_(" -c, --config=DIR Read configuration options from DIR.\n"
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" -D, --no-detach Don't fork and detach.\n"
" -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
" -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
" -n, --net=NETNAME Connect to net NETNAME.\n"
" -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
" -L, --mlock Lock tinc into main memory.\n"
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" --logfile[=FILENAME] Write log entries to a logfile.\n"
" --pidfile=FILENAME Write PID to FILENAME.\n"
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" --help Display this help and exit.\n"
" --version Output version information and exit.\n\n"));
printf(_("Report bugs to tinc@nl.linux.org.\n"));
}
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}
static bool parse_options(int argc, char **argv)
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{
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int r;
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) {
case 0: /* long option */
break;
case 'c': /* config file */
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confbase = xstrdup(optarg);
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break;
case 'D': /* no detach */
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do_detach = false;
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break;
case 'L': /* no detach */
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do_mlock = true;
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break;
case 'd': /* inc debug level */
if(optarg)
debug_level = atoi(optarg);
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else
debug_level++;
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break;
case 'k': /* kill old tincds */
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#ifndef HAVE_MINGW
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if(optarg) {
if(!strcasecmp(optarg, "HUP"))
kill_tincd = SIGHUP;
else if(!strcasecmp(optarg, "TERM"))
kill_tincd = SIGTERM;
else if(!strcasecmp(optarg, "KILL"))
kill_tincd = SIGKILL;
else if(!strcasecmp(optarg, "USR1"))
kill_tincd = SIGUSR1;
else if(!strcasecmp(optarg, "USR2"))
kill_tincd = SIGUSR2;
else if(!strcasecmp(optarg, "WINCH"))
kill_tincd = SIGWINCH;
else if(!strcasecmp(optarg, "INT"))
kill_tincd = SIGINT;
else if(!strcasecmp(optarg, "ALRM"))
kill_tincd = SIGALRM;
else {
kill_tincd = atoi(optarg);
if(!kill_tincd) {
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);
return false;
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}
}
} else
kill_tincd = SIGTERM;
#else
kill_tincd = 1;
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#endif
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break;
case 'n': /* net name given */
netname = xstrdup(optarg);
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break;
case 'K': /* generate public/private keypair */
if(optarg) {
generate_keys = atoi(optarg);
if(generate_keys < 512) {
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);
return false;
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}
generate_keys &= ~7; /* Round it to bytes */
} else
generate_keys = 1024;
break;
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case 1: /* show help */
show_help = true;
break;
case 2: /* show version */
show_version = true;
break;
case 3: /* bypass security */
bypass_security = true;
break;
case 4: /* write log entries to a file */
use_logfile = true;
if(optarg)
logfilename = xstrdup(optarg);
break;
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case 5: /* write PID to a file */
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pidfilename = xstrdup(optarg);
break;
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case '?':
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usage(true);
return false;
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default:
break;
}
}
return true;
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}
/* This function prettyprints the key generation process */
static void indicator(int a, int b, void *p)
{
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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 ask for a file to store
them in.
*/
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static bool keygen(int bits)
{
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RSA *rsa_key;
FILE *f;
char *name = NULL;
char *filename;
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!\n"));
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return false;
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} else
fprintf(stderr, _("Done.\n"));
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asprintf(&filename, "%s/rsa_key.priv", confbase);
f = ask_and_safe_open(filename, _("private RSA key"), true, "a");
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if(!f)
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return false;
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if(ftell(f))
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);
free(filename);
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get_config_string(lookup_config(config_tree, "Name"), &name);
if(name)
asprintf(&filename, "%s/hosts/%s", confbase, name);
else
asprintf(&filename, "%s/rsa_key.pub", confbase);
f = ask_and_safe_open(filename, _("public RSA key"), false, "a");
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if(!f)
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return false;
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if(ftell(f))
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);
free(filename);
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return true;
}
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/*
Set all files and paths according to netname
*/
static void make_names(void)
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{
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if(netname)
asprintf(&identname, "tinc.%s", netname);
else
identname = xstrdup("tinc");
if(!pidfilename)
asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
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if(!logfilename)
asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
if(netname) {
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if(!confbase)
asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
else
logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
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} else {
if(!confbase)
asprintf(&confbase, "%s/tinc", CONFDIR);
}
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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, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
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if(!parse_options(argc, argv))
return 1;
make_names();
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if(show_version) {
printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
VERSION, __DATE__, __TIME__, PROT_CURRENT);
printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
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"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"));
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return 0;
}
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if(show_help) {
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usage(false);
return 0;
}
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if(kill_tincd)
return !kill_other(kill_tincd);
openlogger("tinc", LOGMODE_STDERR);
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/* Lock all pages into memory if requested */
if(do_mlock)
#ifdef HAVE_MLOCKALL
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if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
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strerror(errno));
#else
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{
logger(LOG_ERR, _("mlockall() not supported on this platform!"));
#endif
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return -1;
}
g_argv = argv;
init_configuration(&config_tree);
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/* Slllluuuuuuurrrrp! */
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RAND_load_file("/dev/urandom", 1024);
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OpenSSL_add_all_algorithms();
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if(generate_keys) {
read_server_config();
return !keygen(generate_keys);
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}
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if(!read_server_config())
return 1;
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if(lzo_init() != LZO_E_OK) {
logger(LOG_ERR, _("Error initializing LZO compressor!"));
return 1;
}
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#ifdef HAVE_MINGW
if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
return 1;
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}
if(!do_detach || !init_service())
return main2(argc, argv);
else
return 1;
}
int main2(int argc, char **argv)
{
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#endif
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if(!detach())
return 1;
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/* Setup sockets and open device. If it doesn't work, don't give up but try again. */
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while(!setup_network_connections()) {
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if(do_detach) {
logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
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sleep(maxtimeout);
} else {
logger(LOG_ERR, _("Not restarting."));
return 1;
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}
}
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/* Start main loop. It only exits when tinc is killed. */
int status;
status = main_loop();
/* Shutdown properly. */
close_network_connections();
ifdebug(CONNECTIONS)
dump_device_stats();
logger(LOG_NOTICE, _("Terminating"));
return status;
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}