X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Ftincd.c;h=1a9bad0d55cea46abe899685bd89ecfa80d1b2d6;hb=7ea85043ac1fb2096baea44f6b0af27ac0d0b2cf;hp=6b90de761c413c35e3800aee4f7e2045bd34a973;hpb=721e4caee0f7c6e003c297c95fb6d93bd4102219;p=tinc diff --git a/src/tincd.c b/src/tincd.c index 6b90de76..1a9bad0d 100644 --- a/src/tincd.c +++ b/src/tincd.c @@ -1,7 +1,9 @@ /* tincd.c -- the main file for tincd - Copyright (C) 1998-2003 Ivo Timmermans - 2000-2003 Guus Sliepen + Copyright (C) 1998-2005 Ivo Timmermans + 2000-2009 Guus Sliepen + 2008 Max Rijevski + 2009 Michael Tokarev 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 +15,9 @@ 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 1.10.4.78 2003/07/29 22:59:00 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" @@ -31,14 +31,20 @@ #include #endif -#include -#include -#include -#include +#include LZO1X_H + +#ifndef HAVE_MINGW +#include +#include +#include +#endif -#include +#include #include "conf.h" +#include "control.h" +#include "crypto.h" +#include "device.h" #include "logger.h" #include "net.h" #include "netutl.h" @@ -56,77 +62,75 @@ 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; - /* If nonzero, use null ciphers and skip all key exchanges. */ bool bypass_security = false; /* If nonzero, disable swapping for this process. */ 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 *pidfilename = NULL; /* pid file location */ +char *controlsocketname = NULL; /* control socket 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 */ + +static int status; 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}, - {"pidfile", required_argument, NULL, 5}, + {"controlsocket", required_argument, NULL, 5}, {NULL, 0, NULL, 0} }; #ifdef HAVE_MINGW static struct WSAData wsa_state; +CRITICAL_SECTION mutex; #endif -static void usage(bool status) -{ +static void usage(bool status) { if(status) - fprintf(stderr, _("Try `%s --help\' for more information.\n"), + 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" + " -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" + " --bypass-security Disables meta protocol security, for debugging.\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"); } - - exit(status); } -static void parse_options(int argc, char **argv, char **envp) -{ +static bool parse_options(int argc, char **argv) { int r; int option_index = 0; - while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) { + while((r = getopt_long(argc, argv, "c:DLd::n:RU:", long_options, &option_index)) != EOF) { switch (r) { case 0: /* long option */ break; @@ -140,8 +144,13 @@ static void parse_options(int argc, char **argv, char **envp) break; case 'L': /* no detach */ +#ifndef HAVE_MLOCKALL + logger(LOG_ERR, "%s not supported on this platform", "mlockall()"); + return false; +#else do_mlock = true; break; +#endif case 'd': /* inc debug level */ if(optarg) @@ -150,56 +159,16 @@ static void parse_options(int argc, char **argv, char **envp) debug_level++; 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; -#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); - } + case 'R': /* chroot to NETNAME dir */ + do_chroot = true; + break; - generate_keys &= ~7; /* Round it to bytes */ - } else - generate_keys = 1024; + case 'U': /* setuid to USER */ + switchuser = optarg; break; case 1: /* show help */ @@ -220,107 +189,18 @@ static void parse_options(int argc, char **argv, char **envp) logfilename = xstrdup(optarg); break; - case 5: /* write PID to a file */ - pidfilename = xstrdup(optarg); + case 5: /* open control socket here */ + controlsocketname = xstrdup(optarg); break; case '?': usage(true); + return false; default: break; } } -} - -/* This function prettyprints the key generation process */ - -static 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, "?"); - } -} - -/* - 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")); - return false; - } else - fprintf(stderr, _("Done.\n")); - - asprintf(&filename, "%s/rsa_key.priv", confbase); - f = ask_and_safe_open(filename, _("private RSA key"), true, "a"); - - if(!f) - return false; - - 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); - - get_config_string(lookup_config(config_tree, "Name"), &name); - - if(name) - asprintf(&filename, "%s/hosts/%s", confbase, name); - else - asprintf(&filename, "%s/rsa_key.pub", confbase); - - f = ask_and_safe_open(filename, _("public RSA key"), false, "a"); - - if(!f) - return false; - - 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); return true; } @@ -328,124 +208,253 @@ static bool keygen(int bits) /* Set all files and paths according to netname */ -static void make_names(void) -{ +static void make_names(void) { +#ifdef HAVE_MINGW + HKEY key; + char installdir[1024] = ""; + long len = sizeof installdir; +#endif + if(netname) - asprintf(&identname, "tinc.%s", netname); + xasprintf(&identname, "tinc.%s", netname); else identname = xstrdup("tinc"); - if(!pidfilename) - asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname); +#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/log/%s.log", identname); + if(!confbase) { + if(netname) + xasprintf(&confbase, "%s/%s", installdir, netname); + else + xasprintf(&confbase, "%s", installdir); + } + } + RegCloseKey(key); + if(*installdir) + return; + } +#endif + + if(!controlsocketname) + xasprintf(&controlsocketname, "%s/run/%s.control/socket", LOCALSTATEDIR, identname); if(!logfilename) - asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname); + xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname); if(netname) { if(!confbase) - asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname); + xasprintf(&confbase, CONFDIR "/tinc/%s", netname); else - logger(LOG_INFO, _("Both netname and configuration directory given, using the latter...")); + logger(LOG_INFO, "Both netname and configuration directory given, using the latter..."); } else { if(!confbase) - asprintf(&confbase, "%s/tinc", CONFDIR); + xasprintf(&confbase, CONFDIR "/tinc"); } } -int main(int argc, char **argv, char **envp) -{ - program_name = argv[0]; +static void free_names() { + if (identname) free(identname); + if (netname) free(netname); + if (controlsocketname) free(controlsocketname); + if (logfilename) free(logfilename); + if (confbase) free(confbase); +} - setlocale(LC_ALL, ""); - bindtextdomain(PACKAGE, LOCALEDIR); - textdomain(PACKAGE); +static bool drop_privs() { +#ifdef HAVE_MINGW + if (switchuser) { + logger(LOG_ERR, "%s not supported on this platform", "-U"); + return false; + } + if (do_chroot) { + logger(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(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(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(LOG_ERR, "System call `%s' failed: %s", + "chroot", strerror(errno)); + return false; + } + free(confbase); + confbase = xstrdup(""); + } + if (switchuser) + if (setuid(uid) != 0) { + logger(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) nice(level) +#endif - environment = envp; - parse_options(argc, argv, envp); +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)\n"), PACKAGE, + 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" + printf("Copyright (C) 1998-2009 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")); + "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)); - - openlogger("tinc", LOGMODE_STDERR); - - /* Lock all pages into memory if requested */ + openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR); - 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; + if(!event_init()) { + logger(LOG_ERR, "Error initializing libevent!"); + return 1; } + if(!init_control()) + return 1; + g_argv = argv; init_configuration(&config_tree); /* Slllluuuuuuurrrrp! */ - RAND_load_file("/dev/urandom", 1024); - - OpenSSL_add_all_algorithms(); - - if(generate_keys) { - read_server_config(); - exit(!keygen(generate_keys)); - } + srand(time(NULL)); + crypto_init(); if(!read_server_config()) - exit(1); + return 1; if(lzo_init() != LZO_E_OK) { - logger(LOG_ERR, _("Error initializing LZO compressor!")); - exit(1); + logger(LOG_ERR, "Error initializing LZO compressor!"); + return 1; } #ifdef HAVE_MINGW if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { - logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", strerror(errno)); - exit(1); + logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); + return 1; } + + if(!do_detach || !init_service()) + return main2(argc, argv); + else + return 1; +} + +int main2(int argc, char **argv) { + InitializeCriticalSection(&mutex); + EnterCriticalSection(&mutex); #endif - - if(!detach()) - exit(1); - - for(;;) { - if(setup_network_connections()) { - main_loop(); - cleanup_and_exit(1); - } - logger(LOG_ERR, _("Unrecoverable error")); - cp_trace(); + if(!detach()) + return 1; - if(do_detach) { - logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout); - sleep(maxtimeout); - } else { - logger(LOG_ERR, _("Not restarting.")); - exit(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(LOG_ERR, "System call `%s' failed: %s", "mlockall", + strerror(errno)); + return 1; } +#endif + + /* Setup sockets and open device. */ + + if(!setup_network()) + goto end; + + /* Initiate all outgoing connections. */ + + try_outgoing_connections(); + + /* Change process priority */ + + char *priority = 0; + + if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) { + if(!strcasecmp(priority, "Normal")) + setpriority(NORMAL_PRIORITY_CLASS); + else if(!strcasecmp(priority, "Low")) + setpriority(BELOW_NORMAL_PRIORITY_CLASS); + else if(!strcasecmp(priority, "High")) + setpriority(HIGH_PRIORITY_CLASS); + else { + logger(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. */ + + ifdebug(CONNECTIONS) + dump_device_stats(); + + close_network_connections(); + +end: + logger(LOG_NOTICE, "Terminating"); + +#ifndef HAVE_MINGW + exit_control(); +#endif + + crypto_exit(); + + exit_configuration(&config_tree); + free_names(); + + return status; }