X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Ftincd.c;h=1761dc212ad46c173d881a42c1d9f759e8d289f9;hb=6c0584c55b99dd9814fed5c13536d831b3e5317e;hp=4b303622bedff7fbd21a0f4f36fe2109a9843a38;hpb=fcbe29bc4cc67530581a36cf1a3a1445c741b8e5;p=tinc diff --git a/src/tincd.c b/src/tincd.c index 4b303622..dbf6bc82 100644 --- a/src/tincd.c +++ b/src/tincd.c @@ -1,7 +1,11 @@ /* tincd.c -- the main file for tincd - Copyright (C) 1998-2003 Ivo Timmermans - 2000-2003 Guus Sliepen + Copyright (C) 1998-2005 Ivo Timmermans + 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: tincd.c,v 1.10.4.79 2003/07/30 11:50:45 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 "system.h" @@ -31,423 +33,537 @@ #include #endif -#include -#include -#include -#include - -#include +#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; - -/* If nonzero, it will attempt to kill a running tincd and exit. */ -int kill_tincd = 0; - -/* If nonzero, generate public/private keypair for this host/net. */ -int generate_keys = 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. */ -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 *pidfilename = NULL; /* pid file location */ -char *logfilename = NULL; /* log file location */ -char **g_argv; /* a copy of the cmdline arguments */ -char **environment; /* A pointer to the environment on startup */ +/* 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'}, - {"kill", optional_argument, NULL, 'k'}, {"net", required_argument, NULL, 'n'}, {"help", no_argument, NULL, 1}, {"version", no_argument, NULL, 2}, {"no-detach", no_argument, NULL, 'D'}, - {"generate-keys", optional_argument, NULL, 'K'}, {"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) -{ +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" - " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n" - " -n, --net=NETNAME Connect to net NETNAME.\n" - " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n" - " -L, --mlock Lock tinc into main memory.\n" - " --logfile[=FILENAME] Write log entries to a logfile.\n" - " --pidfile=FILENAME Write PID to FILENAME.\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")); + 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"); } - - exit(status); } -static void parse_options(int argc, char **argv, char **envp) -{ +static bool parse_options(int argc, char **argv) { + config_t *cfg; int r; int option_index = 0; + int lineno = 0; - while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) { - switch (r) { - case 0: /* long option */ - break; + cmdline_conf = list_alloc((list_action_t)free_config); - 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:so:RU:", long_options, &option_index)) != EOF) { + switch(r) { + case 0: /* long option */ + break; - case 'L': /* no detach */ - do_mlock = true; - break; + case 'c': /* config file */ + confbase = xstrdup(optarg); + break; - case 'd': /* inc debug level */ - if(optarg) - debug_level = atoi(optarg); - else - debug_level++; - break; + case 'D': /* no detach */ + do_detach = false; + break; - case 'k': /* kill old tincds */ -#ifndef HAVE_MINGW - if(optarg) { - if(!strcasecmp(optarg, "HUP")) - kill_tincd = SIGHUP; - else if(!strcasecmp(optarg, "TERM")) - kill_tincd = SIGTERM; - else if(!strcasecmp(optarg, "KILL")) - kill_tincd = SIGKILL; - else if(!strcasecmp(optarg, "USR1")) - kill_tincd = SIGUSR1; - else if(!strcasecmp(optarg, "USR2")) - kill_tincd = SIGUSR2; - else if(!strcasecmp(optarg, "WINCH")) - kill_tincd = SIGWINCH; - else if(!strcasecmp(optarg, "INT")) - kill_tincd = SIGINT; - else if(!strcasecmp(optarg, "ALRM")) - kill_tincd = SIGALRM; - else { - kill_tincd = atoi(optarg); - - if(!kill_tincd) { - fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"), - optarg); - usage(true); - } - } - } else - kill_tincd = SIGTERM; + 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 - break; - - case 'n': /* net name given */ - netname = xstrdup(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(true); - } - - generate_keys &= ~7; /* Round it to bytes */ - } else - generate_keys = 1024; - 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: /* write PID to a file */ - pidfilename = xstrdup(optarg); - break; - - case '?': - usage(true); - - default: - break; - } - } -} -/* This function prettyprints the key generation process */ + 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); -static void indicator(int a, int b, void *p) -{ - switch (a) { - case 0: - fprintf(stderr, "."); + if(!cfg) { + return false; + } + + list_insert_tail(cmdline_conf, cfg); break; - case 1: - fprintf(stderr, "+"); +#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 2: - fprintf(stderr, "-"); + case 'U': /* setuid to USER */ + switchuser = optarg; break; +#endif - case 3: - switch (b) { - case 0: - fprintf(stderr, " p\n"); - break; + case 1: /* show help */ + show_help = true; + break; - case 1: - fprintf(stderr, " q\n"); - break; + case 2: /* show version */ + show_version = true; + break; + + case 3: /* bypass security */ + bypass_security = true; + break; - default: - fprintf(stderr, "?"); + 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: - fprintf(stderr, "?"); + break; + } } -} -/* - Generate a public/private RSA keypair, and ask for a file to store - them in. -*/ -static bool keygen(int bits) -{ - RSA *rsa_key; - FILE *f; - char *name = NULL; - 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")); + if(optind < argc) { + fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]); + usage(true); return false; - } else - fprintf(stderr, _("Done.\n")); + } + + if(!netname && (netname = getenv("NETNAME"))) { + netname = xstrdup(netname); + } - asprintf(&filename, "%s/rsa_key.priv", confbase); - f = ask_and_safe_open(filename, _("private RSA key"), true, "a"); + /* netname "." is special: a "top-level name" */ - if(!f) + 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"); + } - if(ftell(f)) - fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n")); + return true; +} - PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL); - fclose(f); - free(filename); +static bool drop_privs(void) { +#ifndef HAVE_MINGW + uid_t uid = 0; - get_config_string(lookup_config(config_tree, "Name"), &name); + if(switchuser) { + struct passwd *pw = getpwnam(switchuser); - if(name) - asprintf(&filename, "%s/hosts/%s", confbase, name); - else - asprintf(&filename, "%s/rsa_key.pub", confbase); + if(!pw) { + logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser); + return false; + } - f = ask_and_safe_open(filename, _("public RSA key"), false, "a"); + uid = pw->pw_uid; - if(!f) - return false; + 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(ftell(f)) - fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n")); + 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(""); + } - PEM_write_RSAPublicKey(f, rsa_key); - fclose(f); - free(filename); + if(switchuser) + if(setuid(uid) != 0) { + logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", + "setuid", strerror(errno)); + return false; + } +#endif return true; } -/* - Set all files and paths according to netname -*/ -static void make_names(void) -{ - if(netname) - asprintf(&identname, "tinc.%s", netname); - else - identname = xstrdup("tinc"); - - if(!pidfilename) - asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname); - - if(!logfilename) - asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname); - - if(netname) { - if(!confbase) - asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname); - else - logger(LOG_INFO, _("Both netname and configuration directory given, using the latter...")); - } else { - if(!confbase) - asprintf(&confbase, "%s/tinc", CONFDIR); +#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, char **envp) -{ +int main(int argc, char **argv) { program_name = argv[0]; - setlocale(LC_ALL, ""); - bindtextdomain(PACKAGE, LOCALEDIR); - textdomain(PACKAGE); - - environment = envp; - parse_options(argc, argv, envp); - make_names(); + if(!parse_options(argc, argv)) { + return 1; + } if(show_version) { - printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE, - VERSION, __DATE__, __TIME__, PROT_CURRENT); - printf(_("Copyright (C) 1998-2003 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; } - if(show_help) + if(show_help) { usage(false); + return 0; + } - if(kill_tincd) - exit(!kill_other(kill_tincd)); + make_names(true); + chdir(confbase); - openlogger("tinc", LOGMODE_STDERR); +#ifdef HAVE_MINGW - /* Lock all pages into memory if requested */ + if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { + logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); + return 1; + } - 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!")); + // 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 - 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! */ - RAND_load_file("/dev/urandom", 1024); + gettimeofday(&now, NULL); + srand(now.tv_sec + now.tv_usec); + crypto_init(); - OpenSSL_add_all_algorithms(); + if(!read_server_config()) { + return 1; + } - if(generate_keys) { - read_server_config(); - exit(!keygen(generate_keys)); + if(!debug_level) { + get_config_int(lookup_config(config_tree, "LogLevel"), &debug_level); } - if(!read_server_config()) - exit(1); +#ifdef HAVE_LZO if(lzo_init() != LZO_E_OK) { - logger(LOG_ERR, _("Error initializing LZO compressor!")); - exit(1); + 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", strerror(errno)); - exit(1); + 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 - - if(!detach()) - exit(1); - - for(;;) { - if(setup_network_connections()) { - main_loop(); - cleanup_and_exit(1); - } + char *priority = NULL; + + if(!detach()) { + return 1; + } + +#ifdef HAVE_MLOCKALL - logger(LOG_ERR, _("Unrecoverable error")); - cp_trace(); + /* 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(do_detach) { - logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout); - sleep(maxtimeout); + /* 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(LOG_ERR, _("Not restarting.")); - exit(1); + 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; }