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tinc/src/tincd.c
Guus Sliepen 537a936671 Update copyright notices.
2015-05-21 11:09:01 +02:00

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/*
tincd.c -- the main file for tincd
Copyright (C) 1998-2005 Ivo Timmermans
2000-2015 Guus Sliepen <guus@tinc-vpn.org>
2008 Max Rijevski <maksuf@gmail.com>
2009 Michael Tokarev <mjt@tls.msk.ru>
2010 Julien Muchembled <jm@jmuchemb.eu>
2010 Timothy Redaelli <timothy@redaelli.eu>
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
/* Darwin (MacOS/X) needs the following definition... */
#ifndef _P1003_1B_VISIBLE
#define _P1003_1B_VISIBLE
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_LZO
#include LZO1X_H
#endif
#ifndef HAVE_MINGW
#include <pwd.h>
#include <grp.h>
#include <time.h>
#endif
#include <getopt.h>
#include "conf.h"
#include "control.h"
#include "crypto.h"
#include "device.h"
#include "event.h"
#include "logger.h"
#include "names.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
#include "version.h"
/* If nonzero, display usage information and exit. */
static bool show_help = false;
/* If nonzero, print the version on standard output and exit. */
static bool show_version = false;
/* If nonzero, use null ciphers and skip all key exchanges. */
bool bypass_security = false;
#ifdef HAVE_MLOCKALL
/* If nonzero, disable swapping for this process. */
static bool do_mlock = false;
#endif
#ifndef HAVE_MINGW
/* If nonzero, chroot to netdir after startup. */
static bool do_chroot = false;
/* If !NULL, do setuid to given user after startup */
static const char *switchuser = NULL;
#endif
/* If nonzero, write log entries to a separate file. */
bool use_logfile = false;
/* If nonzero, use syslog instead of stderr in no-detach mode. */
bool use_syslog = false;
char **g_argv; /* a copy of the cmdline arguments */
static int status = 1;
static struct option const long_options[] = {
{"config", required_argument, NULL, 'c'},
{"net", required_argument, NULL, 'n'},
{"help", no_argument, NULL, 1},
{"version", no_argument, NULL, 2},
{"no-detach", no_argument, NULL, 'D'},
{"debug", optional_argument, NULL, 'd'},
{"bypass-security", no_argument, NULL, 3},
{"mlock", no_argument, NULL, 'L'},
{"chroot", no_argument, NULL, 'R'},
{"user", required_argument, NULL, 'U'},
{"logfile", optional_argument, NULL, 4},
{"syslog", no_argument, NULL, 's'},
{"pidfile", required_argument, NULL, 5},
{"option", required_argument, NULL, 'o'},
{NULL, 0, NULL, 0}
};
#ifdef HAVE_MINGW
static struct WSAData wsa_state;
int main2(int argc, char **argv);
#endif
static void usage(bool status) {
if(status)
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, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
" -n, --net=NETNAME Connect to net NETNAME.\n"
#ifdef HAVE_MLOCKALL
" -L, --mlock Lock tinc into main memory.\n"
#endif
" --logfile[=FILENAME] Write log entries to a logfile.\n"
" -s --syslog Use syslog instead of stderr with --no-detach.\n"
" --pidfile=FILENAME Write PID and control socket cookie to FILENAME.\n"
" --bypass-security Disables meta protocol security, for debugging.\n"
" -o, --option[HOST.]KEY=VALUE Set global/host configuration value.\n"
#ifndef HAVE_MINGW
" -R, --chroot chroot to NET dir at startup.\n"
" -U, --user=USER setuid to given USER at startup.\n"
#endif
" --help Display this help and exit.\n"
" --version Output version information and exit.\n\n");
printf("Report bugs to tinc@tinc-vpn.org.\n");
}
}
static bool parse_options(int argc, char **argv) {
config_t *cfg;
int r;
int option_index = 0;
int lineno = 0;
cmdline_conf = list_alloc((list_action_t)free_config);
while((r = getopt_long(argc, argv, "c:DLd::n:so:RU:", long_options, &option_index)) != EOF) {
switch (r) {
case 0: /* long option */
break;
case 'c': /* config file */
confbase = xstrdup(optarg);
break;
case 'D': /* no detach */
do_detach = false;
break;
case 'L': /* no detach */
#ifndef HAVE_MLOCKALL
logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
return false;
#else
do_mlock = true;
break;
#endif
case 'd': /* increase debug level */
if(!optarg && optind < argc && *argv[optind] != '-')
optarg = argv[optind++];
if(optarg)
debug_level = atoi(optarg);
else
debug_level++;
break;
case 'n': /* net name given */
netname = xstrdup(optarg);
break;
case 's': /* syslog */
use_logfile = false;
use_syslog = true;
break;
case 'o': /* option */
cfg = parse_config_line(optarg, NULL, ++lineno);
if (!cfg)
return false;
list_insert_tail(cmdline_conf, cfg);
break;
#ifdef HAVE_MINGW
case 'R':
case 'U':
logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
return false;
#else
case 'R': /* chroot to NETNAME dir */
do_chroot = true;
break;
case 'U': /* setuid to USER */
switchuser = optarg;
break;
#endif
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_syslog = false;
use_logfile = true;
if(!optarg && optind < argc && *argv[optind] != '-')
optarg = argv[optind++];
if(optarg)
logfilename = xstrdup(optarg);
break;
case 5: /* open control socket here */
pidfilename = xstrdup(optarg);
break;
case '?': /* wrong options */
usage(true);
return false;
default:
break;
}
}
if(optind < argc) {
fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
usage(true);
return false;
}
if(!netname && (netname = getenv("NETNAME")))
netname = xstrdup(netname);
/* netname "." is special: a "top-level name" */
if(netname && (!*netname || !strcmp(netname, "."))) {
free(netname);
netname = NULL;
}
if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
fprintf(stderr, "Invalid character in netname!\n");
return false;
}
return true;
}
static bool drop_privs(void) {
#ifndef HAVE_MINGW
uid_t uid = 0;
if (switchuser) {
struct passwd *pw = getpwnam(switchuser);
if (!pw) {
logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
return false;
}
uid = pw->pw_uid;
if (initgroups(switchuser, pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"initgroups", strerror(errno));
return false;
}
#ifndef __ANDROID__
// Not supported in android NDK
endgrent();
endpwent();
#endif
}
if (do_chroot) {
tzset(); /* for proper timestamps in logs */
if (chroot(confbase) != 0 || chdir("/") != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"chroot", strerror(errno));
return false;
}
free(confbase);
confbase = xstrdup("");
}
if (switchuser)
if (setuid(uid) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"setuid", strerror(errno));
return false;
}
#endif
return true;
}
#ifdef HAVE_MINGW
# define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
static void stop_handler(void *data, int flags) {
event_exit();
}
static BOOL WINAPI console_ctrl_handler(DWORD type) {
logger(DEBUG_ALWAYS, LOG_NOTICE, "Got console shutdown request");
if (WSASetEvent(stop_io.event) == FALSE)
abort();
return TRUE;
}
#else
# define NORMAL_PRIORITY_CLASS 0
# define BELOW_NORMAL_PRIORITY_CLASS 10
# define HIGH_PRIORITY_CLASS -10
# define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
#endif
int main(int argc, char **argv) {
program_name = argv[0];
if(!parse_options(argc, argv))
return 1;
make_names(true);
if(show_version) {
printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
BUILD_VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
printf("Copyright (C) 1998-2015 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(false);
return 0;
}
#ifdef HAVE_MINGW
if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
return 1;
}
#else
// Check if we got an umbilical fd from the process that started us
char *umbstr = getenv("TINC_UMBILICAL");
if(umbstr) {
umbilical = atoi(umbstr);
if(fcntl(umbilical, F_GETFL) < 0)
umbilical = 0;
#ifdef FD_CLOEXEC
if(umbilical)
fcntl(umbilical, F_SETFD, FD_CLOEXEC);
#endif
}
#endif
openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
g_argv = argv;
if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
do_detach = false;
#ifdef HAVE_UNSETENV
unsetenv("LISTEN_PID");
#endif
init_configuration(&config_tree);
/* Slllluuuuuuurrrrp! */
gettimeofday(&now, NULL);
srand(now.tv_sec + now.tv_usec);
crypto_init();
if(!read_server_config())
return 1;
#ifdef HAVE_LZO
if(lzo_init() != LZO_E_OK) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
return 1;
}
#endif
#ifdef HAVE_MINGW
io_add_event(&stop_io, stop_handler, NULL, WSACreateEvent());
if (stop_io.event == FALSE)
abort();
int result;
if(!do_detach || !init_service()) {
SetConsoleCtrlHandler(console_ctrl_handler, TRUE);
result = main2(argc, argv);
} else
result = 1;
if (WSACloseEvent(stop_io.event) == FALSE)
abort();
io_del(&stop_io);
return result;
}
int main2(int argc, char **argv) {
#endif
char *priority = NULL;
if(!detach())
return 1;
#ifdef HAVE_MLOCKALL
/* Lock all pages into memory if requested.
* This has to be done after daemon()/fork() so it works for child.
* No need to do that in parent as it's very short-lived. */
if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
strerror(errno));
return 1;
}
#endif
/* Setup sockets and open device. */
if(!setup_network())
goto end;
/* Change process priority */
if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
if(!strcasecmp(priority, "Normal")) {
if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
goto end;
}
} else if(!strcasecmp(priority, "Low")) {
if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
goto end;
}
} else if(!strcasecmp(priority, "High")) {
if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
goto end;
}
} else {
logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
goto end;
}
}
/* drop privileges */
if (!drop_privs())
goto end;
/* Start main loop. It only exits when tinc is killed. */
logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
if(umbilical) { // snip!
write(umbilical, "", 1);
close(umbilical);
umbilical = 0;
}
try_outgoing_connections();
status = main_loop();
/* Shutdown properly. */
end:
close_network_connections();
logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
free(priority);
crypto_exit();
exit_configuration(&config_tree);
free(cmdline_conf);
free_names();
return status;
}
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