/*
tincd.c -- the main file for tincd
- Copyright (C) 1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>
- 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 1998-2005 Ivo Timmermans
+ 2000-2016 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
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 1.10.4.51 2001/07/24 20:04:22 guus Exp $
+ 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 "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>
+#include "system.h"
+
+/* Darwin (MacOS/X) needs the following definition... */
+#ifndef _P1003_1B_VISIBLE
+#define _P1003_1B_VISIBLE
#endif
-#include <openssl/rand.h>
-#include <openssl/rsa.h>
-#include <openssl/pem.h>
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
-#include <utils.h>
-#include <xalloc.h>
+#ifdef HAVE_LZO
+#include LZO1X_H
+#endif
+
+#ifndef HAVE_MINGW
+#include <pwd.h>
+#include <grp.h>
+#include <time.h>
+#endif
#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 "subnet.h"
-
-#include "system.h"
-
-/* The name this program was run with. */
-char *program_name;
+#include "utils.h"
+#include "xalloc.h"
+#include "version.h"
/* If nonzero, display usage information and exit. */
-static int show_help;
+static bool show_help = false;
/* 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 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 */
-
-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 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}
};
-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);
+#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");
+ }
}
-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 */
- if(optarg)
- debug_lvl = atoi(optarg);
- else
- 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 `%s'; BITS must be a number equal to or greater than 512.\n"),
- optarg);
- usage(1);
- }
- generate_keys &= ~7; /* Round it to bytes */
- }
- else
- generate_keys = 1024;
- break;
- case '?':
- usage(1);
- default:
- break;
- }
- }
+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 && !check_netname(netname, false)) {
+ fprintf(stderr, "Invalid character in netname!\n");
+ return false;
+ }
+
+ if(netname && !check_netname(netname, true)) {
+ fprintf(stderr, "Warning: unsafe character in netname!\n");
+ }
+
+ return true;
}
-/* 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, "?");
- }
+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;
}
-/*
- Generate a public/private RSA keypair, and ask for a file to store
- them in.
-*/
-int keygen(int bits)
-{
- RSA *rsa_key;
- FILE *f;
- config_t const *cfg;
- 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"));
- return -1;
- }
- else
- fprintf(stderr, _("Done.\n"));
-
- if(config && (cfg = get_config_val(config, config_name)))
- asprintf(&filename, "%s/hosts/%s", confbase, cfg->data.ptr);
- else
- asprintf(&filename, "%s/rsa_key.pub", confbase);
-
- if((f = ask_and_safe_open(filename, _("public RSA key"), "a")) == NULL)
- return -1;
-
- if(ftell(f))
- fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
-
- PEM_write_RSAPublicKey(f, rsa_key);
- fclose(f);
- free(filename);
-
- asprintf(&filename, "%s/rsa_key.priv", confbase);
- if((f = ask_and_safe_open(filename, _("private RSA key"), "a")) == NULL)
- return -1;
-
- if(ftell(f))
- fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
-
- PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
- fclose(f);
- free(filename);
-
- return 0;
+#ifdef HAVE_MINGW
+# define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
+
+static void stop_handler(void *data, int flags) {
+ event_exit();
}
-/*
- Set all files and paths according to netname
-*/
-void make_names(void)
-{
- if(netname)
- {
- if(!pidfilename)
- asprintf(&pidfilename, LOCALSTATEDIR "/run/tinc.%s.pid", netname);
- if(!confbase)
- asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
- else
- syslog(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
- if(!identname)
- asprintf(&identname, "tinc.%s", netname);
- }
- else
- {
- if(!pidfilename)
- pidfilename = LOCALSTATEDIR "/run/tinc.pid";
- if(!confbase)
- asprintf(&confbase, "%s/tinc", CONFDIR);
- if(!identname)
- identname = "tinc";
- }
+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;
+ }
+
+ 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) 1998-2016 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;
+ }
+
+ make_names(true);
+ chdir(confbase);
+
+#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;
+ }
-int
-main(int argc, char **argv, char **envp)
-{
- program_name = argv[0];
-
- setlocale (LC_ALL, "");
- bindtextdomain (PACKAGE, LOCALEDIR);
- textdomain (PACKAGE);
-
- 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) 1998-2001 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.\n"));
- return 1;
- }
-
-#ifdef HAVE_SOLARIS
- openlog("tinc", LOG_CONS, LOG_DAEMON); /* Catch all syslog() calls issued before detaching */
-#else
- openlog("tinc", LOG_PERROR, LOG_DAEMON); /* Catch all syslog() calls issued before detaching */
+#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
- g_argv = argv;
-
- make_names();
-
- /* Slllluuuuuuurrrrp! */
-cp
- RAND_load_file("/dev/urandom", 1024);
-cp
- if(generate_keys)
- {
- read_server_config();
- exit(keygen(generate_keys));
- }
-
- if(kill_tincd)
- exit(kill_other());
-
- if(read_server_config())
- exit(1);
-cp
- if(detach())
- exit(0);
-cp
- 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(1);
- }
- }
+ init_configuration(&config_tree);
+
+ /* Slllluuuuuuurrrrp! */
+
+ gettimeofday(&now, NULL);
+ srand(now.tv_sec + now.tv_usec);
+ crypto_init();
+
+ if(!read_server_config()) {
+ return 1;
+ }
+
+ if(!debug_level) {
+ get_config_int(lookup_config(config_tree, "LogLevel"), &debug_level);
+ }
+
+#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;
}