scutil.tproj/notifications.c

   1 /*
   2  * Copyright (c) 2000-2004, 2008-2011 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  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  28  * - public API conversion
  29  *
  30  * November 9, 2000             Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34 #include <pthread.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/time.h>
  38 #include <sys/un.h>
  39 #include <unistd.h>
  40
  41 #include "scutil.h"
  42 #include "notifications.h"
  43
  44
  45 static int                      osig;
  46 static struct sigaction         *oact   = NULL;
  47
  48
  49 static char *
  50 elapsed()
  51 {
  52         int                     n;
  53         static char             str[128];
  54         struct tm               tm_diff;
  55         struct tm               tm_now;
  56         struct timeval          tv_diff;
  57         struct timeval          tv_now;
  58         static struct timeval   tv_then = { 0, 0 };
  59
  60         (void)gettimeofday(&tv_now, NULL);
  61
  62         (void)localtime_r(&tv_now.tv_sec, &tm_now);
  63
  64         timersub(&tv_now, &tv_then, &tv_diff);
  65         (void)localtime_r(&tv_diff.tv_sec, &tm_diff);
  66         n = snprintf(str, sizeof(str), "%2d:%02d:%02d.%03d",
  67                      tm_now.tm_hour,
  68                      tm_now.tm_min,
  69                      tm_now.tm_sec,
  70                      tv_now.tv_usec / 1000);
  71         if (((tv_then.tv_sec != 0) || (tv_then.tv_usec != 0)) && (n < sizeof(str))) {
  72                 snprintf(&str[n], sizeof(str) - n, " (+%ld.%03d)",
  73                          tv_diff.tv_sec,
  74                          tv_diff.tv_usec / 1000);
  75         }
  76
  77         tv_then = tv_now;
  78         return str;
  79 }
  80
  81
  82 static CFComparisonResult
  83 sort_keys(const void *p1, const void *p2, void *context) {
  84         CFStringRef key1 = (CFStringRef)p1;
  85         CFStringRef key2 = (CFStringRef)p2;
  86         return CFStringCompare(key1, key2, 0);
  87 }
  88
  89
  90 __private_extern__
  91 void
  92 storeCallback(SCDynamicStoreRef store, CFArrayRef changedKeys, void *info)
  93 {
  94         int             i;
  95         CFIndex         n;
  96
  97         SCPrint(TRUE, stdout, CFSTR("notification callback (store address = %p).\n"), store);
  98
  99         n = CFArrayGetCount(changedKeys);
 100         if (n > 0) {
 101                 for (i = 0; i < n; i++) {
 102                         SCPrint(TRUE,
 103                                 stdout,
 104                                 CFSTR("  %s changedKey [%d] = %@\n"),
 105                                 elapsed(),
 106                                 i,
 107                                 CFArrayGetValueAtIndex(changedKeys, i));
 108                 }
 109         } else {
 110                 SCPrint(TRUE, stdout, CFSTR("  no changed key's.\n"));
 111         }
 112
 113         return;
 114 }
 115
 116
 117 __private_extern__
 118 void
 119 do_notify_list(int argc, char **argv)
 120 {
 121         int                     i;
 122         CFArrayRef              list;
 123         CFIndex                 listCnt;
 124         Boolean                 isRegex = FALSE;
 125         CFMutableArrayRef       sortedList;
 126
 127         if (store == NULL) {
 128                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(kSCStatusNoStoreSession));
 129                 return;
 130         }
 131
 132         if (argc == 1)
 133                 isRegex = TRUE;
 134
 135         list = isRegex ? watchedPatterns : watchedKeys;
 136         if (!list) {
 137                 SCPrint(TRUE,
 138                         stdout,
 139                         CFSTR("  no notifier %s.\n"),
 140                         isRegex ? "patterns" : "keys");
 141                 return;
 142         }
 143
 144         listCnt = CFArrayGetCount(list);
 145         sortedList = CFArrayCreateMutableCopy(NULL, listCnt, list);
 146         CFArraySortValues(sortedList,
 147                           CFRangeMake(0, listCnt),
 148                           sort_keys,
 149                           NULL);
 150
 151         if (listCnt > 0) {
 152                 for (i = 0; i < listCnt; i++) {
 153                         SCPrint(TRUE,
 154                                 stdout,
 155                                 CFSTR("  notifier %s [%d] = %@\n"),
 156                                 isRegex ? "pattern" : "key",
 157                                 i,
 158                                 CFArrayGetValueAtIndex(sortedList, i));
 159                 }
 160         } else {
 161                 SCPrint(TRUE,
 162                         stdout,
 163                         CFSTR("  no notifier %s.\n"),
 164                         isRegex ? "patterns" : "keys");
 165         }
 166         CFRelease(sortedList);
 167
 168         return;
 169 }
 170
 171
 172 __private_extern__
 173 void
 174 do_notify_add(int argc, char **argv)
 175 {
 176         CFStringRef             key;
 177         CFMutableArrayRef       keys;
 178         Boolean                 isRegex = FALSE;
 179
 180         if (store == NULL) {
 181                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(kSCStatusNoStoreSession));
 182                 return;
 183         }
 184
 185         key = CFStringCreateWithCString(NULL, argv[0], kCFStringEncodingUTF8);
 186
 187         if (argc == 2)
 188                 isRegex = TRUE;
 189
 190         keys = isRegex ? watchedPatterns : watchedKeys;
 191         if (CFArrayContainsValue(keys, CFRangeMake(0, CFArrayGetCount(keys)), key)) {
 192                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(kSCStatusKeyExists));
 193                 CFRelease(key);
 194                 return;
 195         }
 196
 197         CFArrayAppendValue(keys, key);
 198         CFRelease(key);
 199
 200         if (!SCDynamicStoreSetNotificationKeys(store, watchedKeys, watchedPatterns)) {
 201                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 202         }
 203
 204         return;
 205 }
 206
 207
 208 __private_extern__
 209 void
 210 do_notify_remove(int argc, char **argv)
 211 {
 212         CFStringRef             key;
 213         CFMutableArrayRef       keys;
 214         CFIndex                 i;
 215         Boolean                 isRegex = FALSE;
 216
 217         if (store == NULL) {
 218                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(kSCStatusNoStoreSession));
 219                 return;
 220         }
 221
 222         key   = CFStringCreateWithCString(NULL, argv[0], kCFStringEncodingUTF8);
 223
 224         if (argc == 2)
 225                 isRegex = TRUE;
 226
 227         keys = isRegex ? watchedPatterns : watchedKeys;
 228         i = CFArrayGetFirstIndexOfValue(keys, CFRangeMake(0, CFArrayGetCount(keys)), key);
 229         CFRelease(key);
 230
 231         if (i == kCFNotFound) {
 232                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(kSCStatusNoKey));
 233                 return;
 234         }
 235
 236         CFArrayRemoveValueAtIndex(keys, i);
 237
 238         if (!SCDynamicStoreSetNotificationKeys(store, watchedKeys, watchedPatterns)) {
 239                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 240         }
 241
 242         return;
 243 }
 244
 245
 246 __private_extern__
 247 void
 248 do_notify_changes(int argc, char **argv)
 249 {
 250         CFArrayRef      list;
 251         CFIndex         listCnt;
 252         int             i;
 253
 254         list = SCDynamicStoreCopyNotifiedKeys(store);
 255         if (!list) {
 256                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 257                 return;
 258         }
 259
 260         listCnt = CFArrayGetCount(list);
 261         if (listCnt > 0) {
 262                 for (i = 0; i < listCnt; i++) {
 263                         SCPrint(TRUE,
 264                                 stdout,
 265                                 CFSTR("  %s changedKey [%d] = %@\n"),
 266                                 elapsed(),
 267                                 i,
 268                                 CFArrayGetValueAtIndex(list, i));
 269                 }
 270         } else {
 271                 SCPrint(TRUE, stdout, CFSTR("  no changedKey's.\n"));
 272         }
 273         CFRelease(list);
 274
 275         return;
 276 }
 277
 278
 279 static void *
 280 _watcher(void *arg)
 281 {
 282         notifyRl = CFRunLoopGetCurrent();
 283         if (notifyRl == NULL) {
 284                 SCPrint(TRUE, stdout, CFSTR("  CFRunLoopGetCurrent() failed\n"));
 285                 return NULL;
 286         }
 287
 288         if (doDispatch) {
 289                 if (!SCDynamicStoreSetDispatchQueue(store, dispatch_get_current_queue())) {
 290                         SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 291                         notifyRl = NULL;
 292                         return NULL;
 293                 }
 294                 notifyRls = (CFRunLoopSourceRef)kCFNull;
 295         } else {
 296                 notifyRls = SCDynamicStoreCreateRunLoopSource(NULL, store, 0);
 297                 if (notifyRls == NULL) {
 298                         SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 299                         notifyRl = NULL;
 300                         return NULL;
 301                 }
 302                 CFRunLoopAddSource(notifyRl, notifyRls, kCFRunLoopDefaultMode);
 303         }
 304
 305         pthread_setname_np("n.watch");
 306         CFRunLoopRun();
 307         notifyRl = NULL;
 308         return NULL;
 309 }
 310
 311 __private_extern__
 312 void
 313 do_notify_watch(int argc, char **argv)
 314 {
 315         pthread_attr_t  tattr;
 316         pthread_t       tid;
 317
 318         if (notifyRl != NULL) {
 319                 SCPrint(TRUE, stdout, CFSTR("already active\n"));
 320                 return;
 321         }
 322
 323         pthread_attr_init(&tattr);
 324         pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM);
 325         pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED);
 326 //      pthread_attr_setstacksize(&tattr, 96 * 1024); // each thread gets a 96K stack
 327         pthread_create(&tid, &tattr, _watcher, NULL);
 328         pthread_attr_destroy(&tattr);
 329
 330         return;
 331 }
 332
 333
 334 __private_extern__
 335 void
 336 do_notify_wait(int argc, char **argv)
 337 {
 338         if (!SCDynamicStoreNotifyWait(store)) {
 339                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 340                 return;
 341         }
 342
 343         return;
 344 }
 345
 346
 347 __private_extern__
 348 void
 349 do_notify_file(int argc, char **argv)
 350 {
 351         int32_t         reqID = 0;
 352         int             fd;
 353         union {
 354                 char    data[4];
 355                 int32_t gotID;
 356         } buf;
 357         char            *bufPtr;
 358         int             needed;
 359
 360         if (argc == 1) {
 361                 if ((sscanf(argv[0], "%d", &reqID) != 1)) {
 362                         SCPrint(TRUE, stdout, CFSTR("invalid identifier.\n"));
 363                         return;
 364                 }
 365         }
 366
 367         if (!SCDynamicStoreNotifyFileDescriptor(store, reqID, &fd)) {
 368                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 369                 return;
 370         }
 371
 372         bzero(buf.data, sizeof(buf.data));
 373         bufPtr = &buf.data[0];
 374         needed = sizeof(buf.gotID);
 375         while (needed > 0) {
 376                 int     got;
 377
 378                 got = read(fd, bufPtr, needed);
 379                 if (got == -1) {
 380                         /* if error detected */
 381                         SCPrint(TRUE, stdout, CFSTR("read() failed: %s.\n"), strerror(errno));
 382                         break;
 383                 }
 384
 385                 if (got == 0) {
 386                         /* if end of file detected */
 387                         SCPrint(TRUE, stdout, CFSTR("read(): detected end of file.\n"));
 388                         break;
 389                 }
 390
 391                 SCPrint(TRUE, stdout, CFSTR("Received %d bytes.\n"), got);
 392                 bufPtr += got;
 393                 needed -= got;
 394         }
 395
 396         if (needed != sizeof(buf.gotID)) {
 397                 SCPrint(TRUE, stdout, CFSTR("  Received notification, identifier = %d.\n"), buf.gotID);
 398         }
 399
 400         /* report the keys that changed */
 401         do_notify_changes(0, NULL);
 402
 403         /* this utility only allows processes one notification per "n.file" request */
 404         (void) SCDynamicStoreNotifyCancel(store);
 405
 406         (void) close(fd);       /* close my side of the file descriptor */
 407
 408         return;
 409 }
 410
 411
 412 static void
 413 signalCatcher(int signum)
 414 {
 415         static int      n = 0;
 416
 417         SCPrint(TRUE, stdout, CFSTR("Received sig%s (#%d).\n"), sys_signame[signum], n++);
 418         return;
 419 }
 420
 421
 422 __private_extern__
 423 void
 424 do_notify_signal(int argc, char **argv)
 425 {
 426         int                     sig;
 427         pid_t                   pid;
 428         struct sigaction        nact;
 429
 430         if (isdigit(*argv[0])) {
 431                 if ((sscanf(argv[0], "%d", &sig) != 1) || (sig <= 0) || (sig >= NSIG)) {
 432                         SCPrint(TRUE, stdout, CFSTR("signal must be in the range of 1 .. %d.\n"), NSIG-1);
 433                         return;
 434                 }
 435         } else {
 436                 for (sig = 1; sig < NSIG; sig++) {
 437                         if (strcasecmp(argv[0], sys_signame[sig]) == 0)
 438                                 break;
 439                 }
 440                 if (sig >= NSIG) {
 441                         CFMutableStringRef      str;
 442
 443                         SCPrint(TRUE, stdout, CFSTR("Signal must be one of the following:\n"));
 444
 445                         str = CFStringCreateMutable(NULL, 0);
 446                         for (sig = 1; sig < NSIG; sig++) {
 447                                 CFStringAppendFormat(str, NULL, CFSTR(" %-6s"), sys_signame[sig]);
 448                                 if ((sig % 10) == 0) {
 449                                         CFStringAppendFormat(str, NULL, CFSTR("\n"));
 450                                 }
 451                         }
 452                         if ((sig % 10) != 0) {
 453                                 CFStringAppendFormat(str, NULL, CFSTR("\n"));
 454                         }
 455                         SCPrint(TRUE, stdout, CFSTR("%@"), str);
 456                         CFRelease(str);
 457                         return;
 458                 }
 459
 460         }
 461
 462         if ((argc != 2) || (sscanf(argv[1], "%d", &pid) != 1)) {
 463                 pid = getpid();
 464         }
 465
 466         if (oact != NULL) {
 467                 (void) sigaction(osig, oact, NULL);     /* restore original signal handler */
 468         } else {
 469                 oact = malloc(sizeof(struct sigaction));
 470         }
 471
 472         nact.sa_handler = signalCatcher;
 473         sigemptyset(&nact.sa_mask);
 474         nact.sa_flags = SA_RESTART;
 475         (void) sigaction(sig, &nact, oact);
 476         osig = sig;
 477         SCPrint(TRUE, stdout, CFSTR("signal handler started.\n"));
 478
 479         if (!SCDynamicStoreNotifySignal(store, pid, sig)) {
 480                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 481                 return;
 482         }
 483
 484         return;
 485 }
 486
 487
 488 __private_extern__
 489 void
 490 do_notify_cancel(int argc, char **argv)
 491 {
 492         if (notifyRls != NULL) {
 493                 if (doDispatch) {
 494                         if (!SCDynamicStoreSetDispatchQueue(store, NULL)) {
 495                                 SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 496                                 return;
 497                         }
 498                 } else {
 499                         CFRunLoopSourceInvalidate(notifyRls);
 500                         CFRelease(notifyRls);
 501                 }
 502                 notifyRls = NULL;
 503         } else {
 504                 if (!SCDynamicStoreNotifyCancel(store)) {
 505                         SCPrint(TRUE, stdout, CFSTR("  %s\n"), SCErrorString(SCError()));
 506                         return;
 507                 }
 508         }
 509
 510         if (notifyRl != NULL) {
 511                 CFRunLoopStop(notifyRl);
 512         }
 513
 514         if (oact != NULL) {
 515                 (void) sigaction(osig, oact, NULL);     /* restore original signal handler */
 516                 free(oact);
 517                 oact = NULL;
 518         }
 519
 520         return;
 521 }