Annotation of embedaddon/strongswan/src/charon/charon.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2006-2017 Tobias Brunner
! 3: * Copyright (C) 2005-2009 Martin Willi
! 4: * Copyright (C) 2006 Daniel Roethlisberger
! 5: * Copyright (C) 2005 Jan Hutter
! 6: * HSR Hochschule fuer Technik Rapperswil
! 7: *
! 8: * This program is free software; you can redistribute it and/or modify it
! 9: * under the terms of the GNU General Public License as published by the
! 10: * Free Software Foundation; either version 2 of the License, or (at your
! 11: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 12: *
! 13: * This program is distributed in the hope that it will be useful, but
! 14: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 15: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 16: * for more details.
! 17: */
! 18:
! 19: #include <stdio.h>
! 20: #include <signal.h>
! 21: #include <pthread.h>
! 22: #include <sys/stat.h>
! 23: #include <sys/types.h>
! 24: #include <sys/utsname.h>
! 25: #include <unistd.h>
! 26: #include <getopt.h>
! 27: #include <fcntl.h>
! 28: #include <errno.h>
! 29:
! 30: #include <daemon.h>
! 31:
! 32: #include <library.h>
! 33: #include <utils/backtrace.h>
! 34: #include <threading/thread.h>
! 35:
! 36: #ifdef ANDROID
! 37: #include <private/android_filesystem_config.h> /* for AID_VPN */
! 38: #endif
! 39:
! 40: /**
! 41: * PID file, in which charon stores its process id
! 42: */
! 43: #define PID_FILE IPSEC_PIDDIR "/charon.pid"
! 44:
! 45: /**
! 46: * Default user and group
! 47: */
! 48: #ifndef IPSEC_USER
! 49: #define IPSEC_USER NULL
! 50: #endif
! 51:
! 52: #ifndef IPSEC_GROUP
! 53: #define IPSEC_GROUP NULL
! 54: #endif
! 55:
! 56: /**
! 57: * Global reference to PID file (required to truncate, if undeletable)
! 58: */
! 59: static FILE *pidfile = NULL;
! 60:
! 61: /**
! 62: * hook in library for debugging messages
! 63: */
! 64: extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);
! 65:
! 66: /**
! 67: * Logging hook for library logs, using stderr output
! 68: */
! 69: static void dbg_stderr(debug_t group, level_t level, char *fmt, ...)
! 70: {
! 71: va_list args;
! 72:
! 73: if (level <= 1)
! 74: {
! 75: va_start(args, fmt);
! 76: fprintf(stderr, "00[%N] ", debug_names, group);
! 77: vfprintf(stderr, fmt, args);
! 78: fprintf(stderr, "\n");
! 79: va_end(args);
! 80: }
! 81: }
! 82:
! 83: /**
! 84: * Run the daemon and handle unix signals
! 85: */
! 86: static void run()
! 87: {
! 88: sigset_t set;
! 89:
! 90: /* handle SIGINT, SIGHUP and SIGTERM in this handler */
! 91: sigemptyset(&set);
! 92: sigaddset(&set, SIGINT);
! 93: sigaddset(&set, SIGHUP);
! 94: sigaddset(&set, SIGTERM);
! 95: sigprocmask(SIG_BLOCK, &set, NULL);
! 96:
! 97: while (TRUE)
! 98: {
! 99: int sig;
! 100:
! 101: sig = sigwaitinfo(&set, NULL);
! 102: if (sig == -1)
! 103: {
! 104: if (errno == EINTR)
! 105: { /* ignore signals we didn't wait for */
! 106: continue;
! 107: }
! 108: DBG1(DBG_DMN, "waiting for signal failed: %s", strerror(errno));
! 109: return;
! 110: }
! 111: switch (sig)
! 112: {
! 113: case SIGHUP:
! 114: {
! 115: DBG1(DBG_DMN, "signal of type SIGHUP received. Reloading "
! 116: "configuration");
! 117: if (lib->settings->load_files(lib->settings, lib->conf, FALSE))
! 118: {
! 119: charon->load_loggers(charon);
! 120: lib->plugins->reload(lib->plugins, NULL);
! 121: }
! 122: else
! 123: {
! 124: DBG1(DBG_DMN, "reloading config failed, keeping old");
! 125: }
! 126: break;
! 127: }
! 128: case SIGINT:
! 129: {
! 130: DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
! 131: charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
! 132: return;
! 133: }
! 134: case SIGTERM:
! 135: {
! 136: DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
! 137: charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
! 138: return;
! 139: }
! 140: }
! 141: }
! 142: }
! 143:
! 144: /**
! 145: * lookup UID and GID
! 146: */
! 147: static bool lookup_uid_gid()
! 148: {
! 149: char *name;
! 150:
! 151: name = lib->settings->get_str(lib->settings, "charon.user", IPSEC_USER);
! 152: if (name && !lib->caps->resolve_uid(lib->caps, name))
! 153: {
! 154: return FALSE;
! 155: }
! 156: name = lib->settings->get_str(lib->settings, "charon.group", IPSEC_GROUP);
! 157: if (name && !lib->caps->resolve_gid(lib->caps, name))
! 158: {
! 159: return FALSE;
! 160: }
! 161: #ifdef ANDROID
! 162: lib->caps->set_uid(lib->caps, AID_VPN);
! 163: #endif
! 164: return TRUE;
! 165: }
! 166:
! 167: /**
! 168: * Handle SIGSEGV/SIGILL signals raised by threads
! 169: */
! 170: #ifndef DISABLE_SIGNAL_HANDLER
! 171: static void segv_handler(int signal)
! 172: {
! 173: backtrace_t *backtrace;
! 174:
! 175: DBG1(DBG_DMN, "thread %u received %d", thread_current_id(), signal);
! 176: backtrace = backtrace_create(2);
! 177: backtrace->log(backtrace, NULL, TRUE);
! 178: backtrace->log(backtrace, stderr, TRUE);
! 179: backtrace->destroy(backtrace);
! 180:
! 181: DBG1(DBG_DMN, "killing ourself, received critical signal");
! 182: abort();
! 183: }
! 184: #endif /* DISABLE_SIGNAL_HANDLER */
! 185:
! 186: /**
! 187: * Check/create PID file, return TRUE if already running
! 188: */
! 189: static bool check_pidfile()
! 190: {
! 191: struct stat stb;
! 192:
! 193: if (stat(PID_FILE, &stb) == 0)
! 194: {
! 195: pidfile = fopen(PID_FILE, "r");
! 196: if (pidfile)
! 197: {
! 198: char buf[64];
! 199: pid_t pid = 0;
! 200:
! 201: memset(buf, 0, sizeof(buf));
! 202: if (fread(buf, 1, sizeof(buf), pidfile))
! 203: {
! 204: buf[sizeof(buf) - 1] = '\0';
! 205: pid = atoi(buf);
! 206: }
! 207: fclose(pidfile);
! 208: pidfile = NULL;
! 209: if (pid && pid != getpid() && kill(pid, 0) == 0)
! 210: {
! 211: DBG1(DBG_DMN, "charon already running ('"PID_FILE"' exists)");
! 212: return TRUE;
! 213: }
! 214: }
! 215: DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
! 216: unlink(PID_FILE);
! 217: }
! 218:
! 219: /* create new pidfile */
! 220: pidfile = fopen(PID_FILE, "w");
! 221: if (pidfile)
! 222: {
! 223: int fd;
! 224:
! 225: fd = fileno(pidfile);
! 226: if (fd == -1)
! 227: {
! 228: DBG1(DBG_DMN, "unable to determine fd for '"PID_FILE"'");
! 229: return TRUE;
! 230: }
! 231: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
! 232: {
! 233: DBG1(DBG_LIB, "setting FD_CLOEXEC for '"PID_FILE"' failed: %s",
! 234: strerror(errno));
! 235: }
! 236: /* Only change owner of the pidfile if we have CAP_CHOWN. Otherwise,
! 237: * attempt to change group of pidfile to group under which charon
! 238: * runs after dropping caps. This requires the user that charon
! 239: * starts as to:
! 240: * a) Have write access to the socket dir.
! 241: * b) Belong to the group that charon will run under after dropping
! 242: * caps. */
! 243: if (lib->caps->check(lib->caps, CAP_CHOWN))
! 244: {
! 245: ignore_result(fchown(fd,
! 246: lib->caps->get_uid(lib->caps),
! 247: lib->caps->get_gid(lib->caps)));
! 248: }
! 249: else
! 250: {
! 251: ignore_result(fchown(fd, -1,
! 252: lib->caps->get_gid(lib->caps)));
! 253: }
! 254: fprintf(pidfile, "%d\n", getpid());
! 255: fflush(pidfile);
! 256: return FALSE;
! 257: }
! 258: else
! 259: {
! 260: DBG1(DBG_DMN, "unable to create pidfile '"PID_FILE"'");
! 261: return TRUE;
! 262: }
! 263: }
! 264:
! 265: /**
! 266: * Delete/truncate the PID file
! 267: */
! 268: static void unlink_pidfile()
! 269: {
! 270: /* because unlinking the PID file may fail, we truncate it to ensure the
! 271: * daemon can be properly restarted. one probable cause for this is the
! 272: * combination of not running as root and the effective user lacking
! 273: * permissions on the parent dir(s) of the PID file */
! 274: if (pidfile)
! 275: {
! 276: ignore_result(ftruncate(fileno(pidfile), 0));
! 277: fclose(pidfile);
! 278: unlink(PID_FILE);
! 279: }
! 280: }
! 281:
! 282: /**
! 283: * print command line usage and exit
! 284: */
! 285: static void usage(const char *msg)
! 286: {
! 287: if (msg != NULL && *msg != '\0')
! 288: {
! 289: fprintf(stderr, "%s\n", msg);
! 290: }
! 291: fprintf(stderr, "Usage: charon\n"
! 292: " [--help]\n"
! 293: " [--version]\n"
! 294: " [--use-syslog]\n"
! 295: " [--debug-<type> <level>]\n"
! 296: " <type>: log context type (dmn|mgr|ike|chd|job|cfg|knl|net|asn|enc|tnc|imc|imv|pts|tls|esp|lib)\n"
! 297: " <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
! 298: " 2 = controlmore, 3 = raw, 4 = private)\n"
! 299: "\n"
! 300: );
! 301: }
! 302:
! 303: /**
! 304: * Main function, starts the daemon.
! 305: */
! 306: int main(int argc, char *argv[])
! 307: {
! 308: struct sigaction action;
! 309: int group, status = SS_RC_INITIALIZATION_FAILED;
! 310: struct utsname utsname;
! 311: level_t levels[DBG_MAX];
! 312: bool use_syslog = FALSE;
! 313:
! 314: /* logging for library during initialization, as we have no bus yet */
! 315: dbg = dbg_stderr;
! 316:
! 317: /* initialize library */
! 318: if (!library_init(NULL, "charon"))
! 319: {
! 320: library_deinit();
! 321: exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
! 322: }
! 323:
! 324: if (lib->integrity &&
! 325: !lib->integrity->check_file(lib->integrity, "charon", argv[0]))
! 326: {
! 327: dbg_stderr(DBG_DMN, 1, "integrity check of charon failed");
! 328: library_deinit();
! 329: exit(SS_RC_DAEMON_INTEGRITY);
! 330: }
! 331:
! 332: if (!libcharon_init())
! 333: {
! 334: dbg_stderr(DBG_DMN, 1, "initialization failed - aborting charon");
! 335: goto deinit;
! 336: }
! 337:
! 338: /* use CTRL loglevel for default */
! 339: for (group = 0; group < DBG_MAX; group++)
! 340: {
! 341: levels[group] = LEVEL_CTRL;
! 342: }
! 343:
! 344: /* handle arguments */
! 345: for (;;)
! 346: {
! 347: struct option long_opts[] = {
! 348: { "help", no_argument, NULL, 'h' },
! 349: { "version", no_argument, NULL, 'v' },
! 350: { "use-syslog", no_argument, NULL, 'l' },
! 351: /* TODO: handle "debug-all" */
! 352: { "debug-dmn", required_argument, &group, DBG_DMN },
! 353: { "debug-mgr", required_argument, &group, DBG_MGR },
! 354: { "debug-ike", required_argument, &group, DBG_IKE },
! 355: { "debug-chd", required_argument, &group, DBG_CHD },
! 356: { "debug-job", required_argument, &group, DBG_JOB },
! 357: { "debug-cfg", required_argument, &group, DBG_CFG },
! 358: { "debug-knl", required_argument, &group, DBG_KNL },
! 359: { "debug-net", required_argument, &group, DBG_NET },
! 360: { "debug-asn", required_argument, &group, DBG_ASN },
! 361: { "debug-enc", required_argument, &group, DBG_ENC },
! 362: { "debug-tnc", required_argument, &group, DBG_TNC },
! 363: { "debug-imc", required_argument, &group, DBG_IMC },
! 364: { "debug-imv", required_argument, &group, DBG_IMV },
! 365: { "debug-pts", required_argument, &group, DBG_PTS },
! 366: { "debug-tls", required_argument, &group, DBG_TLS },
! 367: { "debug-esp", required_argument, &group, DBG_ESP },
! 368: { "debug-lib", required_argument, &group, DBG_LIB },
! 369: { 0,0,0,0 }
! 370: };
! 371:
! 372: int c = getopt_long(argc, argv, "", long_opts, NULL);
! 373: switch (c)
! 374: {
! 375: case EOF:
! 376: break;
! 377: case 'h':
! 378: usage(NULL);
! 379: status = 0;
! 380: goto deinit;
! 381: case 'v':
! 382: printf("FreeBSD strongSwan %s\n", VERSION);
! 383: status = 0;
! 384: goto deinit;
! 385: case 'l':
! 386: use_syslog = TRUE;
! 387: continue;
! 388: case 0:
! 389: /* option is in group */
! 390: levels[group] = atoi(optarg);
! 391: continue;
! 392: default:
! 393: usage("");
! 394: status = 1;
! 395: goto deinit;
! 396: }
! 397: break;
! 398: }
! 399:
! 400: if (!lookup_uid_gid())
! 401: {
! 402: dbg_stderr(DBG_DMN, 1, "invalid uid/gid - aborting charon");
! 403: goto deinit;
! 404: }
! 405:
! 406: charon->set_default_loggers(charon, levels, !use_syslog);
! 407: charon->load_loggers(charon);
! 408:
! 409: if (uname(&utsname) != 0)
! 410: {
! 411: memset(&utsname, 0, sizeof(utsname));
! 412: }
! 413: DBG1(DBG_DMN, "Starting IKE charon daemon (strongSwan "VERSION", %s %s, %s)",
! 414: utsname.sysname, utsname.release, utsname.machine);
! 415: if (lib->integrity)
! 416: {
! 417: DBG1(DBG_DMN, "integrity tests enabled:");
! 418: DBG1(DBG_DMN, "lib 'libstrongswan': passed file and segment integrity tests");
! 419: DBG1(DBG_DMN, "lib 'libcharon': passed file and segment integrity tests");
! 420: DBG1(DBG_DMN, "daemon 'charon': passed file integrity test");
! 421: }
! 422:
! 423: /* initialize daemon */
! 424: if (!charon->initialize(charon,
! 425: lib->settings->get_str(lib->settings, "charon.load", PLUGINS)))
! 426: {
! 427: DBG1(DBG_DMN, "initialization failed - aborting charon");
! 428: goto deinit;
! 429: }
! 430: lib->plugins->status(lib->plugins, LEVEL_CTRL);
! 431:
! 432: if (check_pidfile())
! 433: {
! 434: goto deinit;
! 435: }
! 436:
! 437: if (!lib->caps->drop(lib->caps))
! 438: {
! 439: DBG1(DBG_DMN, "capability dropping failed - aborting charon");
! 440: goto deinit;
! 441: }
! 442:
! 443: /* add handler for fatal signals,
! 444: * INT, TERM and HUP are handled by sigwaitinfo() in run() */
! 445: action.sa_flags = 0;
! 446: sigemptyset(&action.sa_mask);
! 447: sigaddset(&action.sa_mask, SIGINT);
! 448: sigaddset(&action.sa_mask, SIGTERM);
! 449: sigaddset(&action.sa_mask, SIGHUP);
! 450:
! 451: /* optionally let the external system handle fatal signals */
! 452: #ifndef DISABLE_SIGNAL_HANDLER
! 453: action.sa_handler = segv_handler;
! 454: sigaction(SIGSEGV, &action, NULL);
! 455: sigaction(SIGILL, &action, NULL);
! 456: sigaction(SIGBUS, &action, NULL);
! 457: #endif /* DISABLE_SIGNAL_HANDLER */
! 458:
! 459: action.sa_handler = SIG_IGN;
! 460: sigaction(SIGPIPE, &action, NULL);
! 461:
! 462: pthread_sigmask(SIG_SETMASK, &action.sa_mask, NULL);
! 463:
! 464: /* start daemon (i.e. the threads in the thread-pool) */
! 465: charon->start(charon);
! 466:
! 467: /* main thread goes to run loop */
! 468: run();
! 469:
! 470: status = 0;
! 471:
! 472: deinit:
! 473: libcharon_deinit();
! 474: unlink_pidfile();
! 475: library_deinit();
! 476: return status;
! 477: }
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