configd.tproj/configd.m

   1 /*
   2  * Copyright (c) 2000-2011, 2013-2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * Modification History
  26  *
  27  * October 30, 2003             Allan Nathanson <ajn@apple.com>
  28  * - add plugin "stop()" function support
  29  *
  30  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  31  * - public API conversion
  32  *
  33  * 24 March 2000                Allan Nathanson <ajn@apple.com>
  34  * - created
  35  */
  36
  37 #define DO_NOT_INFORM
  38
  39 #include <getopt.h>
  40 #include <stdio.h>
  41 #include <sysexits.h>
  42 #include <syslog.h>
  43 #include <unistd.h>
  44 #include <paths.h>
  45 #include <fcntl.h>
  46 #include <sys/types.h>
  47 #include <sys/stat.h>
  48 #include <sys/wait.h>
  49 #include <objc/objc-runtime.h>
  50 #include <servers/bootstrap.h>
  51 #include <vproc.h>
  52 #include <vproc_priv.h>
  53
  54 #include "configd.h"
  55 #include "configd_server.h"
  56 #include "plugin_support.h"
  57
  58 #if     TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR && !defined(DO_NOT_INFORM)
  59 #include <CoreFoundation/CFUserNotification.h>
  60 #endif  // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR && !defined(DO_NOT_INFORM)
  61
  62 __private_extern__
  63 Boolean _configd_verbose                = FALSE;        /* TRUE if verbose logging enabled */
  64
  65 __private_extern__
  66 CFMutableSetRef _plugins_allowed        = NULL;         /* bundle identifiers to allow when loading */
  67
  68 __private_extern__
  69 CFMutableSetRef _plugins_exclude        = NULL;         /* bundle identifiers to exclude from loading */
  70
  71 __private_extern__
  72 CFMutableSetRef _plugins_verbose        = NULL;         /* bundle identifiers to enable verbose logging */
  73
  74 static CFMachPortRef termRequested      = NULL;         /* Mach port used to notify runloop of a shutdown request */
  75
  76
  77 static const struct option longopts[] = {
  78 //      { "include-plugin",     required_argument,      0,      'A' },
  79 //      { "no-bundles",         no_argument,            0,      'b' },
  80 //      { "exclude-plugin",     required_argument,      0,      'B' },
  81 //      { "no-fork",            no_argument,            0,      'd' },
  82 //      { "test-bundle",        required_argument,      0,      't' },
  83 //      { "verbose",            no_argument,            0,      'v' },
  84 //      { "verbose-bundle",     required_argument,      0,      'V' },
  85         { "help",               no_argument,            0,      '?' },
  86         { 0,                    0,                      0,      0 }
  87 };
  88
  89
  90 static void
  91 usage(const char *prog)
  92 {
  93         SCPrint(TRUE, stderr, CFSTR("%s: [-d] [-v] [-V bundleID] [-b] [-B bundleID] [-A bundleID] [-t bundle-path]\n"), prog);
  94         SCPrint(TRUE, stderr, CFSTR("options:\n"));
  95         SCPrint(TRUE, stderr, CFSTR("\t-d\tdisable daemon/run in foreground\n"));
  96         SCPrint(TRUE, stderr, CFSTR("\t-v\tenable verbose logging\n"));
  97         SCPrint(TRUE, stderr, CFSTR("\t-V\tenable verbose logging for the specified plug-in\n"));
  98         SCPrint(TRUE, stderr, CFSTR("\t-f\tload ALL plug-ins in a separate process\n"));
  99         SCPrint(TRUE, stderr, CFSTR("\t-b\tdisable loading of ALL plug-ins\n"));
 100         SCPrint(TRUE, stderr, CFSTR("\t-B\tdisable loading of the specified plug-in\n"));
 101         SCPrint(TRUE, stderr, CFSTR("\t-A\tenable loading of the specified plug-in\n"));
 102         SCPrint(TRUE, stderr, CFSTR("\t-t\tload/test the specified plug-in\n"));
 103         SCPrint(TRUE, stderr, CFSTR("\t\t  (Note: only the plug-in will be started)\n"));
 104         exit (EX_USAGE);
 105 }
 106
 107
 108 __private_extern__ os_log_t
 109 __configd_SCDynamicStore()
 110 {
 111         static os_log_t log     = NULL;
 112
 113         if (log == NULL) {
 114                 log = os_log_create("com.apple.SystemConfiguration", "SCDynamicStore");
 115         }
 116
 117         return log;
 118 }
 119
 120
 121 static void
 122 catcher(int signum)
 123 {
 124         switch (signum) {
 125                 case SIGINT :
 126                 case SIGTERM :
 127                         if (termRequested != NULL) {
 128                                 if (_sc_log > 0) {
 129                                         /*
 130                                          * if we've received a [shutdown] SIGTERM
 131                                          * and we are syslog'ing than it's likely
 132                                          * that syslogd is also being term'd.  As
 133                                          * such, let's also push any remaining log
 134                                          * messages to stdout/stderr.
 135                                          */
 136                                         _sc_log = 2;
 137                                 }
 138
 139                                 /*
 140                                  * send message to indicate that a request has been made
 141                                  * for the daemon to be shutdown.
 142                                  */
 143                                 _SC_sendMachMessage(CFMachPortGetPort(termRequested), 0);
 144                         } else {
 145                                 _exit(EX_OK);
 146                         }
 147                         break;
 148         }
 149
 150         return;
 151 }
 152
 153
 154 static void
 155 term(CFMachPortRef port, void *msg, CFIndex size, void *info)
 156 {
 157 #pragma unused(port)
 158 #pragma unused(msg)
 159 #pragma unused(size)
 160 #pragma unused(info)
 161         int     status  = EX_OK;
 162         Boolean wait;
 163
 164         wait = plugin_term(&status);
 165         if (!wait) {
 166                 // if we are not waiting on a plugin
 167                 status = server_shutdown();
 168                 exit (status);
 169         }
 170
 171         return;
 172 }
 173
 174
 175 static void
 176 parent_exit(int i)
 177 {
 178 #pragma unused(i)
 179         _exit (0);
 180 }
 181
 182
 183 static void
 184 init_fds()
 185 {
 186         int     fd;
 187         int     i;
 188
 189         /* close any open FDs */
 190         for (i = getdtablesize()-1; i>=0; i--) close(i);
 191
 192         /* set stdin, stdout, stderr */
 193         fd = open(_PATH_DEVNULL, O_RDWR, 0);
 194         if (fd != -1) {
 195                 int     ofd;
 196
 197                 // stdin
 198                 (void) dup2(fd, STDIN_FILENO);
 199
 200                 // stdout, stderr
 201                 ofd = open("/var/log/configd.log", O_WRONLY|O_APPEND, 0);
 202                 if (ofd != -1) {
 203                         if (fd > STDIN_FILENO) {
 204                                 (void) close(fd);
 205                         }
 206                         fd = ofd;
 207                 }
 208                 (void) dup2(fd, STDOUT_FILENO);
 209                 (void) dup2(fd, STDERR_FILENO);
 210                 if (fd > STDERR_FILENO) {
 211                         (void) close(fd);
 212                 }
 213         }
 214
 215         return;
 216 }
 217
 218
 219 static int
 220 fork_child()
 221 {
 222         int     child_pid;
 223
 224         signal(SIGTERM, parent_exit);
 225         child_pid = fork();
 226         switch (child_pid) {
 227                 case -1: {
 228                         return -1;
 229                 }
 230                 case 0: {
 231                         /* child: becomes the daemon (see below) */
 232                         signal(SIGTERM, SIG_DFL);
 233                         break;
 234                 }
 235                 default: {
 236                         /* parent: wait for signal, then exit */
 237                         int     status;
 238
 239                         (void) wait4(child_pid, (int *)&status, 0, 0);
 240                         if (WIFEXITED(status)) {
 241                                 fprintf(stderr,
 242                                         "*** configd (daemon) failed to start, exit status=%d\n",
 243                                         WEXITSTATUS(status));
 244                         } else {
 245                                 fprintf(stderr,
 246                                         "*** configd (daemon) failed to start, received signal=%d\n",
 247                                         WTERMSIG(status));
 248                         }
 249                         fflush (stderr);
 250                         exit (EX_SOFTWARE);
 251                 }
 252         }
 253
 254         if (setsid() == -1)
 255                 return -1;
 256
 257         (void) chdir("/");
 258
 259         return 0;
 260 }
 261
 262 static CFStringRef
 263 termMPCopyDescription(const void *info)
 264 {
 265 #pragma unused(info)
 266         return CFStringCreateWithFormat(NULL, NULL, CFSTR("<SIGTERM MP>"));
 267 }
 268
 269
 270 int
 271 main(int argc, char * const argv[])
 272 {
 273         CFMachPortContext       context         = { 0
 274                                                   , (void *)1
 275                                                   , NULL
 276                                                   , NULL
 277                                                   , termMPCopyDescription
 278                                                   };
 279         Boolean                 forceForeground = FALSE;
 280         Boolean                 forcePlugin     = FALSE;
 281         int64_t                 is_launchd_job  = 0;
 282         mach_port_limits_t      limits;
 283         Boolean                 loadBundles     = TRUE;
 284         struct sigaction        nact;
 285         int                     opt;
 286 //      extern int              optind;
 287         const char              *prog           = argv[0];
 288         CFRunLoopSourceRef      rls;
 289         kern_return_t           status;
 290         CFStringRef             str;
 291         const char              *testBundle     = NULL;
 292
 293         _plugins_allowed = CFSetCreateMutable(NULL, 0, &kCFTypeSetCallBacks);
 294         _plugins_exclude = CFSetCreateMutable(NULL, 0, &kCFTypeSetCallBacks);
 295         _plugins_verbose = CFSetCreateMutable(NULL, 0, &kCFTypeSetCallBacks);
 296
 297         /* process any arguments */
 298
 299         while ((opt = getopt_long(argc, argv, "A:bB:dt:vV:", longopts, NULL)) != -1) {
 300                 switch(opt) {
 301                         case 'A':
 302                                 str = CFStringCreateWithCString(NULL, optarg, kCFStringEncodingMacRoman);
 303                                 CFSetSetValue(_plugins_allowed, str);
 304                                 CFRelease(str);
 305                                 break;
 306                         case 'b':
 307                                 loadBundles = FALSE;
 308                                 break;
 309                         case 'B':
 310                                 str = CFStringCreateWithCString(NULL, optarg, kCFStringEncodingMacRoman);
 311                                 CFSetSetValue(_plugins_exclude, str);
 312                                 CFRelease(str);
 313                                 break;
 314                         case 'd':
 315                                 forceForeground = TRUE;
 316                                 break;
 317                         case 't':
 318                                 testBundle = optarg;
 319                                 break;
 320                         case 'v':
 321                                 _configd_verbose = TRUE;
 322                                 break;
 323                         case 'V':
 324                                 if (strcmp(optarg, "com.apple.SystemConfiguration") == 0) {
 325                                         _sc_verbose = TRUE;
 326                                 } else {
 327                                         str = CFStringCreateWithCString(NULL, optarg, kCFStringEncodingMacRoman);
 328                                         CFSetSetValue(_plugins_verbose, str);
 329                                         CFRelease(str);
 330                                 }
 331                                 break;
 332                         case '?':
 333                         default :
 334                                 usage(prog);
 335                 }
 336         }
 337 //      argc -= optind;
 338 //      argv += optind;
 339
 340         /* check credentials */
 341 #if     !TARGET_OS_SIMULATOR
 342         if (getuid() != 0) {
 343                 fprintf(stderr, "%s: permission denied.\n", prog);
 344                 exit (EX_NOPERM);
 345         }
 346 #endif  // !TARGET_OS_SIMULATOR
 347
 348         /* check if we have been started by launchd */
 349         vproc_swap_integer(NULL, VPROC_GSK_IS_MANAGED, NULL, &is_launchd_job);
 350
 351 #if     TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR && !defined(DO_NOT_INFORM)
 352         // if launchd job, check to see if we have been restarted
 353         if (is_launchd_job) {
 354                 int64_t status  = 0;
 355
 356                 vproc_swap_integer(NULL, VPROC_GSK_LAST_EXIT_STATUS, NULL, &status);
 357                 if ((status != 0) && _SC_isAppleInternal()) {
 358                         int     fd;
 359
 360                         // if we've been restarted
 361                         fd = open("/var/run/configd-crash-reported", O_WRONLY|O_CREAT|O_EXCL, 0644);
 362                         if (fd >= 0) {
 363                                 // if we have not yet alerted the user
 364                                 CFUserNotificationDisplayNotice(0,
 365                                                                 kCFUserNotificationStopAlertLevel,
 366                                                                 NULL,
 367                                                                 NULL,
 368                                                                 NULL,
 369                                                                 CFSTR("\"configd\" restarted"),
 370                                                                 CFSTR("Please collect the crash report and file a Radar."),
 371                                                                 NULL);
 372                                 close(fd);
 373                         }
 374                 }
 375         }
 376 #endif  // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR && !defined(DO_NOT_INFORM)
 377
 378         /* ensure that forked plugins behave */
 379         if (testBundle != NULL) {
 380                 forcePlugin = TRUE;
 381         }
 382
 383         /* if needed, daemonize */
 384         if (!forceForeground && !is_launchd_job) {
 385                 /*
 386                  * if we haven't been asked to run in the foreground
 387                  * and have not been started by launchd (i.e. we're
 388                  * not already running as a Foreground process) then
 389                  * daemonize ourself.
 390                  */
 391                 if (fork_child() == -1) {
 392                         fprintf(stderr, "configd: fork() failed: %s\n", strerror(errno));
 393                         exit (1);
 394                 }
 395
 396                 /*
 397                  * Note: we are now the child process. The parent
 398                  *       waits/exits in fork_child.
 399                  */
 400         }
 401
 402         /*
 403          * close file descriptors, establish stdin/stdout/stderr,
 404          * setup logging.
 405          */
 406         if (!forceForeground || forcePlugin) {
 407                 int             facility        = LOG_DAEMON;
 408                 int             logopt          = LOG_CONS|LOG_NDELAY|LOG_PID;
 409
 410                 if (!is_launchd_job && !forcePlugin) {
 411                         init_fds();
 412                 }
 413
 414                 if (_configd_verbose) {
 415                         logopt |= LOG_CONS;
 416                 }
 417
 418                 if (_SC_isInstallEnvironment()) {
 419                         facility = LOG_INSTALL;
 420                 }
 421
 422                 openlog("configd", logopt, facility);
 423         } else {
 424                 _sc_log = FALSE;        /* redirect SCLog() to stdout/stderr */
 425         }
 426
 427         /* add signal handler to catch a SIGHUP */
 428         nact.sa_handler = catcher;
 429         sigemptyset(&nact.sa_mask);
 430         nact.sa_flags = SA_RESTART;
 431         if (sigaction(SIGHUP, &nact, NULL) == -1) {
 432                 SC_log(LOG_ERR, "sigaction(SIGHUP, ...) failed: %s", strerror(errno));
 433         }
 434
 435         /* add signal handler to catch a SIGPIPE */
 436         if (sigaction(SIGPIPE, &nact, NULL) == -1) {
 437                 SC_log(LOG_ERR, "sigaction(SIGPIPE, ...) failed: %s", strerror(errno));
 438         }
 439
 440         /* add signal handler to catch a SIGTERM */
 441         if (sigaction(SIGTERM, &nact, NULL) == -1) {
 442                 SC_log(LOG_ERR, "sigaction(SIGTERM, ...) failed: %s", strerror(errno));
 443         }
 444
 445         /* add signal handler to catch a SIGINT */
 446         if (sigaction(SIGINT, &nact, NULL) == -1) {
 447                 SC_log(LOG_ERR, "sigaction(SIGINT, ...) failed: %s", strerror(errno));
 448         }
 449
 450         /* create the "shutdown requested" notification port */
 451         termRequested = CFMachPortCreate(NULL, term, &context, NULL);
 452
 453         /* set queue limit */
 454         limits.mpl_qlimit = 1;
 455         status = mach_port_set_attributes(mach_task_self(),
 456                                           CFMachPortGetPort(termRequested),
 457                                           MACH_PORT_LIMITS_INFO,
 458                                           (mach_port_info_t)&limits,
 459                                           MACH_PORT_LIMITS_INFO_COUNT);
 460         if (status != KERN_SUCCESS) {
 461                 perror("mach_port_set_attributes");
 462         }
 463
 464         /* add to our runloop */
 465         rls = CFMachPortCreateRunLoopSource(NULL, termRequested, 0);
 466         CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode);
 467         CFRelease(rls);
 468
 469         if (testBundle == NULL) {
 470                 /* initialize primary (store management) thread */
 471                 server_init();
 472
 473                 if (!forceForeground && !is_launchd_job) {
 474                         /* synchronize with parent process */
 475                         kill(getppid(), SIGTERM);
 476                 }
 477
 478                 /* load/initialize/start bundles into the secondary thread */
 479                 if (loadBundles) {
 480                         /* start plug-in initialization */
 481                         plugin_init();
 482                 }
 483
 484                 /* start primary (store management) thread */
 485                 server_loop();
 486         } else {
 487                 /* load/initialize/start specified plug-in */
 488                 plugin_exec((void *)testBundle);
 489         }
 490
 491         exit (EX_OK);   /* insure the process exit status is 0 */
 492         return 0;       /* ...and make main fit the ANSI spec. */
 493 }