/* tincd.c -- the main file for tincd Copyright (C) 1998-2005 Ivo Timmermans 2000-2012 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 #include #include #include #include #include #ifdef HAVE_LZO #include LZO1X_H #endif #ifndef HAVE_MINGW #include #include #include #endif #include #include "conf.h" #include "control.h" #include "crypto.h" #include "device.h" #include "logger.h" #include "net.h" #include "netutl.h" #include "process.h" #include "protocol.h" #include "utils.h" #include "xalloc.h" /* The name this program was run with. */ char *program_name = NULL; /* 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; /* If nonzero, disable swapping for this process. */ static bool do_mlock = false; /* 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; /* If nonzero, write log entries to a separate file. */ bool use_logfile = false; char *identname = NULL; /* program name for syslog */ char *logfilename = NULL; /* log file location */ char *pidfilename = NULL; 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}, {"pidfile", required_argument, NULL, 5}, {"option", required_argument, NULL, 'o'}, {NULL, 0, NULL, 0} }; #ifdef HAVE_MINGW static struct WSAData wsa_state; CRITICAL_SECTION mutex; 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" " -L, --mlock Lock tinc into main memory.\n" " --logfile[=FILENAME] Write log entries to a logfile.\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" " -R, --chroot chroot to NET dir at startup.\n" " -U, --user=USER setuid to given USER at startup.\n" " --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:o: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, "%s not supported on this platform", "mlockall()"); return false; #else do_mlock = true; break; #endif case 'd': /* inc debug level */ if(optarg) debug_level = atoi(optarg); else debug_level++; break; case 'n': /* net name given */ netname = xstrdup(optarg); break; case 'o': /* option */ cfg = parse_config_line(optarg, NULL, ++lineno); if (!cfg) return false; list_insert_tail(cmdline_conf, cfg); break; case 'R': /* chroot to NETNAME dir */ do_chroot = true; break; case 'U': /* setuid to USER */ switchuser = optarg; break; 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; case 5: /* open control socket here */ pidfilename = xstrdup(optarg); break; case '?': usage(true); return false; default: break; } } 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; } /* Set all files and paths according to netname */ static void make_names(void) { #ifdef HAVE_MINGW HKEY key; char installdir[1024] = ""; long len = sizeof installdir; #endif if(netname) xasprintf(&identname, "tinc.%s", netname); else identname = xstrdup("tinc"); #ifdef HAVE_MINGW if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) { if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) { if(!logfilename) xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", identname); if(!confbase) { if(netname) xasprintf(&confbase, "%s" SLASH "%s", installdir, netname); else xasprintf(&confbase, "%s", installdir); } if(!pidfilename) xasprintf(&pidfilename, "%s" SLASH "pid", confbase); } RegCloseKey(key); if(*installdir) return; } #endif if(!logfilename) xasprintf(&logfilename, LOCALSTATEDIR SLASH "log" SLASH "%s.log", identname); if(!pidfilename) xasprintf(&pidfilename, LOCALSTATEDIR SLASH "run" SLASH "%s.pid", identname); if(netname) { if(!confbase) xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname); else logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter..."); } else { if(!confbase) xasprintf(&confbase, CONFDIR SLASH "tinc"); } } static void free_names(void) { if (identname) free(identname); if (netname) free(netname); if (pidfilename) free(pidfilename); if (logfilename) free(logfilename); if (confbase) free(confbase); } static bool drop_privs(void) { #ifdef HAVE_MINGW if (switchuser) { logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-U"); return false; } if (do_chroot) { logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-R"); return false; } #else 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; } endgrent(); endpwent(); } 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)) #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(); if(show_version) { printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE, VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR); printf("Copyright (C) 1998-2012 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; } #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! */ srand(time(NULL)); 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 if(!do_detach || !init_service()) return main2(argc, argv); else return 1; } int main2(int argc, char **argv) { InitializeCriticalSection(&mutex); EnterCriticalSection(&mutex); #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 if(!event_init()) { logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing libevent!"); return 1; } /* Setup sockets and open device. */ if(!setup_network()) goto end_nonet; if(!init_control()) goto end_nonet; /* Initiate all outgoing connections. */ try_outgoing_connections(); /* 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. */ status = main_loop(); /* Shutdown properly. */ if(debug_level >= DEBUG_CONNECTIONS) devops.dump_stats(); close_network_connections(); end: exit_control(); end_nonet: logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating"); free(priority); crypto_exit(); exit_configuration(&config_tree); free(cmdline_conf); free_names(); return status; }