/* tincd.c -- the main file for tincd Copyright (C) 1998-2005 Ivo Timmermans 2000-2016 Guus Sliepen 2008 Max Rijevski 2009 Michael Tokarev 2010 Julien Muchembled 2010 Timothy Redaelli 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 #endif #ifdef HAVE_LZO #include LZO1X_H #endif #ifndef HAVE_MINGW #include #include #include #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 "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 && !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; } 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); chdir(confbase); 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; } #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; }