X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Ftincd.c;h=1761dc212ad46c173d881a42c1d9f759e8d289f9;hb=6c0584c55b99dd9814fed5c13536d831b3e5317e;hp=c0c12addae28f763228cb3f56c4430b068610998;hpb=f8733d1935ed83399c4851a31f4be710eb8c825f;p=tinc diff --git a/src/tincd.c b/src/tincd.c index c0c12add..dbf6bc82 100644 --- a/src/tincd.c +++ b/src/tincd.c @@ -1,7 +1,11 @@ /* tincd.c -- the main file for tincd Copyright (C) 1998-2005 Ivo Timmermans - 2000-2007 Guus Sliepen + 2000-2018 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 @@ -13,11 +17,9 @@ 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. - - $Id$ + 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" @@ -31,46 +33,62 @@ #include #endif +#ifdef HAVE_LZO #include LZO1X_H +#endif -#include +#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" - -/* The name this program was run with. */ -char *program_name = NULL; +#include "version.h" /* If nonzero, display usage information and exit. */ -bool show_help = false; +static bool show_help = false; /* If nonzero, print the version on standard output and exit. */ -bool show_version = false; +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. */ -bool do_mlock = false; +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; -char *identname = NULL; /* program name for syslog */ -char *controlsocketname = NULL; /* control socket location */ -char *logfilename = NULL; /* log file location */ -char **g_argv; /* a copy of the cmdline arguments */ +/* 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; +static int status = 1; static struct option const long_options[] = { {"config", required_argument, NULL, 'c'}, @@ -81,174 +99,285 @@ static struct option const long_options[] = { {"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}, - {"controlsocket", required_argument, NULL, 5}, + {"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) -{ +static void usage(bool status) { if(status) - fprintf(stderr, _("Try `%s --help\' for more information.\n"), - program_name); + 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" - " --controlsocket=FILENAME Open control socket at FILENAME.\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")); + 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) -{ +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; - while((r = getopt_long(argc, argv, "c:DLd::n:", 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 */ - do_mlock = true; - break; - - 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 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 */ - controlsocketname = xstrdup(optarg); - break; - - case '?': - usage(true); + 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; - default: - 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; } -/* - 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); +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(netname) - asprintf(&identname, "tinc.%s", netname); - else - identname = xstrdup("tinc"); + if(do_chroot) { + tzset(); /* for proper timestamps in logs */ -#ifdef HAVE_MINGW - if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) { - if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) { - if(!logfilename) - asprintf(&logfilename, "%s/log/%s.log", identname); - if(!confbase) { - if(netname) - asprintf(&confbase, "%s/%s", installdir, netname); - else - asprintf(&confbase, "%s", installdir); - } + if(chroot(confbase) != 0 || chdir("/") != 0) { + logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", + "chroot", strerror(errno)); + return false; } - RegCloseKey(key); - if(*installdir) - return; + + 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)) - if(!controlsocketname) - asprintf(&controlsocketname, LOCALSTATEDIR "/run/%s.control", identname); +static void stop_handler(void *data, int flags) { + event_exit(); +} - if(!logfilename) - asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname); +static BOOL WINAPI console_ctrl_handler(DWORD type) { + logger(DEBUG_ALWAYS, LOG_NOTICE, "Got console shutdown request"); - if(netname) { - if(!confbase) - asprintf(&confbase, CONFDIR "/tinc/%s", netname); - else - logger(LOG_INFO, _("Both netname and configuration directory given, using the latter...")); - } else { - if(!confbase) - asprintf(&confbase, CONFDIR "/tinc"); + 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) -{ +int main(int argc, char **argv) { program_name = argv[0]; - setlocale(LC_ALL, ""); - bindtextdomain(PACKAGE, LOCALEDIR); - textdomain(PACKAGE); - - if(!parse_options(argc, argv)) + if(!parse_options(argc, argv)) { return 1; - - make_names(); + } if(show_version) { - printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE, - VERSION, __DATE__, __TIME__, PROT_CURRENT); - printf(_("Copyright (C) 1998-2007 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")); + 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) 1998-2018 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; } @@ -258,91 +387,183 @@ int main(int argc, char **argv) return 0; } - openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR); + make_names(true); + chdir(confbase); + +#ifdef HAVE_MINGW - if(!event_init()) { - logger(LOG_ERR, _("Error initializing libevent!")); + if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { + logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); return 1; } - if(!init_control()) - return 1; +#else + // Check if we got an umbilical fd from the process that started us + char *umbstr = getenv("TINC_UMBILICAL"); - /* Lock all pages into memory if requested */ + if(umbstr) { + umbilical = atoi(umbstr); + + if(fcntl(umbilical, F_GETFL) < 0) { + umbilical = 0; + } + +#ifdef FD_CLOEXEC + + if(umbilical) { + fcntl(umbilical, F_SETFD, FD_CLOEXEC); + } - if(do_mlock) -#ifdef HAVE_MLOCKALL - if(mlockall(MCL_CURRENT | MCL_FUTURE)) { - logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall", - strerror(errno)); -#else - { - logger(LOG_ERR, _("mlockall() not supported on this platform!")); #endif - 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)); + gettimeofday(&now, NULL); + srand(now.tv_sec + now.tv_usec); crypto_init(); - if(!read_server_config()) + 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(LOG_ERR, _("Error initializing LZO compressor!")); + logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!"); return 1; } +#endif + #ifdef HAVE_MINGW - if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { - logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError())); - return 1; + io_add_event(&stop_io, stop_handler, NULL, WSACreateEvent()); + + if(stop_io.event == FALSE) { + abort(); } - if(!do_detach || !init_service()) - return main2(argc, argv); - else - return 1; + 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) -{ +int main2(int argc, char **argv) { #endif + char *priority = NULL; - if(!detach()) + 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_connections()) + 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(); - ifdebug(CONNECTIONS) - dump_device_stats(); + logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating"); -end: - logger(LOG_NOTICE, _("Terminating")); - -#ifndef HAVE_MINGW - exit_control(); -#endif + free(priority); crypto_exit(); + exit_configuration(&config_tree); + free(cmdline_conf); + free_names(); + return status; }