SystemConfiguration.fproj/SCDHostName.c

   1 /*
   2  * Copyright (c) 2000-2008 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  * January 8, 2001              Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34
  35 #include <CoreFoundation/CoreFoundation.h>
  36 #include <CoreFoundation/CFStringDefaultEncoding.h>     // for __CFStringGetUserDefaultEncoding
  37 #include <SystemConfiguration/SystemConfiguration.h>
  38 #include <SystemConfiguration/SCValidation.h>
  39 #include <SystemConfiguration/SCPrivate.h>
  40
  41
  42 #pragma mark ComputerName
  43
  44
  45 static CFStringRef
  46 _SCPreferencesCopyComputerName(SCPreferencesRef prefs,
  47                                CFStringEncoding *nameEncoding)
  48 {
  49         CFDictionaryRef dict;
  50         CFStringRef     name            = NULL;
  51         CFStringRef     path;
  52         Boolean         tempPrefs       = FALSE;
  53
  54         if (prefs == NULL) {
  55                 prefs = SCPreferencesCreate(NULL, CFSTR("_SCPreferencesCopyComputerName"), NULL);
  56                 if (prefs == NULL) {
  57                         return NULL;
  58                 }
  59                 tempPrefs = TRUE;
  60         }
  61
  62         path = CFStringCreateWithFormat(NULL,
  63                                         NULL,
  64                                         CFSTR("/%@/%@"),
  65                                         kSCPrefSystem,
  66                                         kSCCompSystem);
  67         dict = SCPreferencesPathGetValue(prefs, path);
  68         CFRelease(path);
  69
  70         if (dict != NULL) {
  71                 if (isA_CFDictionary(dict)) {
  72                         name = CFDictionaryGetValue(dict, kSCPropSystemComputerName);
  73                         name = isA_CFString(name);
  74                         if (name != NULL) {
  75                                 CFRetain(name);
  76                         }
  77                 }
  78
  79                 if (nameEncoding != NULL) {
  80                         CFNumberRef     num;
  81
  82                         num = CFDictionaryGetValue(dict,
  83                                                    kSCPropSystemComputerNameEncoding);
  84                         if (isA_CFNumber(num)) {
  85                                 CFNumberGetValue(num, kCFNumberIntType, nameEncoding);
  86                         } else {
  87                                 *nameEncoding = CFStringGetSystemEncoding();
  88                         }
  89                 }
  90         }
  91
  92         if (tempPrefs)  CFRelease(prefs);
  93         if (name == NULL) {
  94                 _SCErrorSet(kSCStatusNoKey);
  95         }
  96         return name;
  97 }
  98
  99
 100 CFStringRef
 101 SCDynamicStoreKeyCreateComputerName(CFAllocatorRef allocator)
 102 {
 103         return SCDynamicStoreKeyCreate(allocator,
 104                                        CFSTR("%@/%@"),
 105                                        kSCDynamicStoreDomainSetup,
 106                                        kSCCompSystem);
 107 }
 108
 109
 110 CFStringRef
 111 SCDynamicStoreCopyComputerName(SCDynamicStoreRef        store,
 112                                CFStringEncoding         *nameEncoding)
 113 {
 114         CFDictionaryRef         dict;
 115         CFStringRef             key;
 116         CFStringRef             name            = NULL;
 117         Boolean                 tempSession     = FALSE;
 118
 119         if (store == NULL) {
 120                 store = SCDynamicStoreCreate(NULL,
 121                                              CFSTR("SCDynamicStoreCopyComputerName"),
 122                                              NULL,
 123                                              NULL);
 124                 if (store == NULL) {
 125                         return NULL;
 126                 }
 127                 tempSession = TRUE;
 128         }
 129
 130         key  = SCDynamicStoreKeyCreateComputerName(NULL);
 131         dict = SCDynamicStoreCopyValue(store, key);
 132         CFRelease(key);
 133         if (dict == NULL) {
 134                 /*
 135                  * Let's try looking in the preferences.plist file until
 136                  * (a) we add an API to retrieve the name regardless of
 137                  *     where it is stored and
 138                  * (b) this API is deprecated
 139                  */
 140                 name = _SCPreferencesCopyComputerName(NULL, nameEncoding);
 141                 goto done;
 142         }
 143         if (!isA_CFDictionary(dict)) {
 144                 _SCErrorSet(kSCStatusNoKey);
 145                 goto done;
 146         }
 147
 148         name = isA_CFString(CFDictionaryGetValue(dict, kSCPropSystemComputerName));
 149         if (name == NULL) {
 150                 _SCErrorSet(kSCStatusNoKey);
 151                 goto done;
 152         }
 153         CFRetain(name);
 154
 155         if (nameEncoding != NULL) {
 156                 CFNumberRef     num;
 157
 158                 num = CFDictionaryGetValue(dict,
 159                                            kSCPropSystemComputerNameEncoding);
 160                 if (isA_CFNumber(num)) {
 161                         CFNumberGetValue(num, kCFNumberIntType, nameEncoding);
 162                 } else {
 163                         *nameEncoding = CFStringGetSystemEncoding();
 164                 }
 165         }
 166
 167     done :
 168
 169         if (tempSession)        CFRelease(store);
 170         if (dict != NULL)       CFRelease(dict);
 171         return name;
 172 }
 173
 174
 175 Boolean
 176 SCPreferencesSetComputerName(SCPreferencesRef   prefs,
 177                              CFStringRef        name,
 178                              CFStringEncoding   encoding)
 179 {
 180         CFDictionaryRef         dict;
 181         CFMutableDictionaryRef  newDict;
 182         CFNumberRef             num;
 183         Boolean                 ok;
 184         CFStringRef             path;
 185
 186         if (name != NULL) {
 187                 CFIndex len;
 188
 189                 if (!isA_CFString(name)) {
 190                         _SCErrorSet(kSCStatusInvalidArgument);
 191                         return FALSE;
 192                 }
 193
 194                 len = CFStringGetLength(name);
 195                 if (len == 0) {
 196                         name = NULL;
 197                 }
 198         }
 199
 200         path = CFStringCreateWithFormat(NULL,
 201                                         NULL,
 202                                         CFSTR("/%@/%@"),
 203                                         kSCPrefSystem,
 204                                         kSCCompSystem);
 205
 206         dict = SCPreferencesPathGetValue(prefs, path);
 207         if (dict != NULL) {
 208                 newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
 209         } else {
 210                 newDict = CFDictionaryCreateMutable(NULL,
 211                                                     0,
 212                                                     &kCFTypeDictionaryKeyCallBacks,
 213                                                     &kCFTypeDictionaryValueCallBacks);
 214         }
 215
 216         if ((name != NULL) && (CFStringGetLength(name) > 0)) {
 217                 CFDictionarySetValue(newDict, kSCPropSystemComputerName, name);
 218
 219                 num = CFNumberCreate(NULL, kCFNumberSInt32Type, &encoding);
 220                 CFDictionarySetValue(newDict, kSCPropSystemComputerNameEncoding, num);
 221                 CFRelease(num);
 222
 223                 CFDictionaryRemoveValue(newDict, kSCPropSystemComputerNameRegion);
 224                 if (encoding == kCFStringEncodingMacRoman) {
 225                         UInt32  userEncoding    = 0;
 226                         UInt32  userRegion      = 0;
 227
 228                         __CFStringGetUserDefaultEncoding(&userEncoding, &userRegion);
 229                         if ((userEncoding == kCFStringEncodingMacRoman) && (userRegion != 0)) {
 230                                 num = CFNumberCreate(NULL, kCFNumberSInt32Type, &userRegion);
 231                                 CFDictionarySetValue(newDict, kSCPropSystemComputerNameRegion, num);
 232                                 CFRelease(num);
 233                         }
 234                 }
 235         } else {
 236                 CFDictionaryRemoveValue(newDict, kSCPropSystemComputerName);
 237                 CFDictionaryRemoveValue(newDict, kSCPropSystemComputerNameEncoding);
 238                 CFDictionaryRemoveValue(newDict, kSCPropSystemComputerNameRegion);
 239         }
 240
 241         if (CFDictionaryGetCount(newDict) > 0) {
 242                 ok = SCPreferencesPathSetValue(prefs, path, newDict);
 243         } else {
 244                 ok = SCPreferencesPathRemoveValue(prefs, path);
 245         }
 246
 247         CFRelease(path);
 248         CFRelease(newDict);
 249
 250         return ok;
 251 }
 252
 253
 254 #pragma mark -
 255 #pragma mark HostName
 256
 257
 258 CFStringRef
 259 SCPreferencesGetHostName(SCPreferencesRef       prefs)
 260 {
 261         CFDictionaryRef dict;
 262         CFStringRef     name;
 263         CFStringRef     path;
 264
 265         path = CFStringCreateWithFormat(NULL,
 266                                         NULL,
 267                                         CFSTR("/%@/%@"),
 268                                         kSCPrefSystem,
 269                                         kSCCompSystem);
 270         dict = SCPreferencesPathGetValue(prefs, path);
 271         CFRelease(path);
 272
 273         if (!isA_CFDictionary(dict)) {
 274                 _SCErrorSet(kSCStatusNoKey);
 275                 return NULL;
 276         }
 277
 278         name = isA_CFString(CFDictionaryGetValue(dict, kSCPropSystemHostName));
 279         if (name == NULL) {
 280                 _SCErrorSet(kSCStatusNoKey);
 281                 return NULL;
 282         }
 283
 284         return name;
 285 }
 286
 287
 288 Boolean
 289 SCPreferencesSetHostName(SCPreferencesRef       prefs,
 290                          CFStringRef            name)
 291 {
 292         CFDictionaryRef         dict;
 293         CFMutableDictionaryRef  newDict;
 294         Boolean                 ok;
 295         CFStringRef             path;
 296
 297         if (name != NULL) {
 298                 CFIndex len;
 299
 300                 if (!isA_CFString(name)) {
 301                         _SCErrorSet(kSCStatusInvalidArgument);
 302                         return FALSE;
 303                 }
 304
 305                 len = CFStringGetLength(name);
 306                 if (len == 0) {
 307                         name = NULL;
 308                 }
 309         }
 310
 311         path = CFStringCreateWithFormat(NULL,
 312                                         NULL,
 313                                         CFSTR("/%@/%@"),
 314                                         kSCPrefSystem,
 315                                         kSCCompSystem);
 316
 317         dict = SCPreferencesPathGetValue(prefs, path);
 318         if (dict != NULL) {
 319                 newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
 320         } else {
 321                 newDict = CFDictionaryCreateMutable(NULL,
 322                                                     0,
 323                                                     &kCFTypeDictionaryKeyCallBacks,
 324                                                     &kCFTypeDictionaryValueCallBacks);
 325         }
 326
 327         if (name != NULL) {
 328                 CFDictionarySetValue(newDict, kSCPropSystemHostName, name);
 329         } else {
 330                 CFDictionaryRemoveValue(newDict, kSCPropSystemHostName);
 331         }
 332
 333         if (CFDictionaryGetCount(newDict) > 0) {
 334                 ok = SCPreferencesPathSetValue(prefs, path, newDict);
 335         } else {
 336                 ok = SCPreferencesPathRemoveValue(prefs, path);
 337         }
 338
 339         CFRelease(path);
 340         CFRelease(newDict);
 341
 342         return ok;
 343 }
 344
 345
 346 #pragma mark -
 347 #pragma mark LocalHostName
 348
 349
 350 static CFStringRef
 351 _SCPreferencesCopyLocalHostName(SCPreferencesRef        prefs)
 352 {
 353         CFDictionaryRef dict;
 354         CFStringRef     name            = NULL;
 355         CFStringRef     path;
 356         Boolean         tempPrefs       = FALSE;
 357
 358         if (prefs == NULL) {
 359                 prefs = SCPreferencesCreate(NULL, CFSTR("_SCPreferencesCopyLocalHostName"), NULL);
 360                 if (prefs == NULL) {
 361                         return NULL;
 362                 }
 363                 tempPrefs = TRUE;
 364         }
 365
 366         path = CFStringCreateWithFormat(NULL,
 367                                         NULL,
 368                                         CFSTR("/%@/%@/%@"),
 369                                         kSCPrefSystem,
 370                                         kSCCompNetwork,
 371                                         kSCCompHostNames);
 372         dict = SCPreferencesPathGetValue(prefs, path);
 373         CFRelease(path);
 374
 375         if (dict != NULL) {
 376                 if (isA_CFDictionary(dict)) {
 377                         name = CFDictionaryGetValue(dict, kSCPropNetLocalHostName);
 378                         name = isA_CFString(name);
 379                         if (name != NULL) {
 380                                 CFRetain(name);
 381                         }
 382                 }
 383         }
 384
 385         if (tempPrefs)  CFRelease(prefs);
 386         if (name == NULL) {
 387                 _SCErrorSet(kSCStatusNoKey);
 388         }
 389         return name;
 390 }
 391
 392
 393 CFStringRef
 394 SCDynamicStoreKeyCreateHostNames(CFAllocatorRef allocator)
 395 {
 396         return SCDynamicStoreKeyCreate(allocator,
 397                                        CFSTR("%@/%@/%@"),
 398                                        kSCDynamicStoreDomainSetup,
 399                                        kSCCompNetwork,
 400                                        kSCCompHostNames);
 401 }
 402
 403
 404 CFStringRef
 405 SCDynamicStoreCopyLocalHostName(SCDynamicStoreRef store)
 406 {
 407         CFDictionaryRef         dict;
 408         CFStringRef             key;
 409         CFStringRef             name            = NULL;
 410         Boolean                 tempSession     = FALSE;
 411
 412         if (store == NULL) {
 413                 store = SCDynamicStoreCreate(NULL,
 414                                              CFSTR("SCDynamicStoreCopyLocalHostName"),
 415                                              NULL,
 416                                              NULL);
 417                 if (store == NULL) {
 418                         return NULL;
 419                 }
 420                 tempSession = TRUE;
 421         }
 422
 423         key  = SCDynamicStoreKeyCreateHostNames(NULL);
 424         dict = SCDynamicStoreCopyValue(store, key);
 425         CFRelease(key);
 426         if (dict == NULL) {
 427                 /*
 428                  * Let's try looking in the preferences.plist file until
 429                  * (a) we add an API to retrieve the name regardless of
 430                  *     where it is stored and
 431                  * (b) this API is deprecated
 432                  */
 433                 name = _SCPreferencesCopyLocalHostName(NULL);
 434                 goto done;
 435         }
 436         if (!isA_CFDictionary(dict)) {
 437                 _SCErrorSet(kSCStatusNoKey);
 438                 goto done;
 439         }
 440
 441         name = isA_CFString(CFDictionaryGetValue(dict, kSCPropNetLocalHostName));
 442         if (name == NULL) {
 443                 _SCErrorSet(kSCStatusNoKey);
 444                 goto done;
 445         }
 446         CFRetain(name);
 447
 448     done :
 449
 450         if (tempSession)        CFRelease(store);
 451         if (dict != NULL)       CFRelease(dict);
 452         return name;
 453 }
 454
 455
 456 Boolean
 457 _SC_stringIsValidDNSName(const char *name)
 458 {
 459         int             i;
 460         int             len     = strlen(name);
 461         char            prev    = '\0';
 462         const char      *scan;
 463
 464         if (len == 0) {
 465                 return FALSE;
 466         }
 467
 468         for (scan = name, i = 0; i < len; i++, scan++) {
 469                 char    ch      = *scan;
 470                 char    next    = *(scan + 1);
 471
 472                 if (prev == '.' || prev == '\0') {
 473                         if (isalnum(ch) == 0) {
 474                                 /* a label must begin with a letter or digit */
 475                                 return FALSE;
 476                         }
 477                 } else if (next == '\0' || next == '.') {
 478                         if (isalnum(ch) == 0) {
 479                                 /* a label must end with a letter or digit */
 480                                 return FALSE;
 481                         }
 482                 } else if (isalnum(ch) == 0) {
 483                         switch (ch) {
 484                                 case '.':
 485                                         if (prev == '.') {
 486                                                 /* no empty labels */
 487                                                 return FALSE;
 488                                         }
 489                                         break;
 490                                 case '-':
 491                                         /* hyphens are OK within a label */
 492                                         break;
 493                                 default:
 494                                         /* an invalid character */
 495                                         return FALSE;
 496                                         break;
 497                         }
 498                 }
 499                 prev = ch;
 500         }
 501
 502         return TRUE;
 503 }
 504
 505
 506 Boolean
 507 _SC_CFStringIsValidDNSName(CFStringRef name)
 508 {
 509         Boolean clean   = FALSE;
 510         char    *str    = NULL;
 511
 512         if (!isA_CFString(name)) {
 513                 return FALSE;
 514         }
 515
 516         str = _SC_cfstring_to_cstring(name, NULL, 0, kCFStringEncodingASCII);
 517         if (str == NULL) {
 518                 return FALSE;
 519         }
 520
 521         clean = _SC_stringIsValidDNSName(str);
 522
 523         if (str != NULL)        CFAllocatorDeallocate(NULL, str);
 524         return clean;
 525 }
 526
 527
 528 Boolean
 529 SCPreferencesSetLocalHostName(SCPreferencesRef  prefs,
 530                               CFStringRef       name)
 531 {
 532         CFDictionaryRef         dict;
 533         CFMutableDictionaryRef  newDict;
 534         Boolean                 ok;
 535         CFStringRef             path;
 536
 537         if (name != NULL) {
 538                 CFIndex len;
 539
 540                 if (!isA_CFString(name)) {
 541                         _SCErrorSet(kSCStatusInvalidArgument);
 542                         return FALSE;
 543                 }
 544
 545                 len = CFStringGetLength(name);
 546                 if (len > 0) {
 547                         if (!_SC_CFStringIsValidDNSName(name)) {
 548                                 _SCErrorSet(kSCStatusInvalidArgument);
 549                                 return FALSE;
 550                         }
 551
 552                         if (CFStringFindWithOptions(name, CFSTR("."), CFRangeMake(0, len), 0, NULL)) {
 553                                 _SCErrorSet(kSCStatusInvalidArgument);
 554                                 return FALSE;
 555                         }
 556                 } else {
 557                         name = NULL;
 558                 }
 559         }
 560
 561         path = CFStringCreateWithFormat(NULL,
 562                                         NULL,
 563                                         CFSTR("/%@/%@/%@"),
 564                                         kSCPrefSystem,
 565                                         kSCCompNetwork,
 566                                         kSCCompHostNames);
 567
 568         dict = SCPreferencesPathGetValue(prefs, path);
 569         if (dict != NULL) {
 570                 newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
 571         } else {
 572                 newDict = CFDictionaryCreateMutable(NULL,
 573                                                     0,
 574                                                     &kCFTypeDictionaryKeyCallBacks,
 575                                                     &kCFTypeDictionaryValueCallBacks);
 576         }
 577
 578         if (name != NULL) {
 579                 CFDictionarySetValue(newDict, kSCPropNetLocalHostName, name);
 580         } else {
 581                 CFDictionaryRemoveValue(newDict, kSCPropNetLocalHostName);
 582         }
 583
 584         if (CFDictionaryGetCount(newDict) > 0) {
 585                 ok = SCPreferencesPathSetValue(prefs, path, newDict);
 586         } else {
 587                 ok = SCPreferencesPathRemoveValue(prefs, path);
 588         }
 589
 590         CFRelease(path);
 591         CFRelease(newDict);
 592
 593         return ok;
 594 }
 595
 596
 597 Boolean
 598 _SC_CFStringIsValidNetBIOSName(CFStringRef name)
 599 {
 600         if (!isA_CFString(name)) {
 601                 return FALSE;
 602         }
 603
 604         if (CFStringGetLength(name) > 15) {
 605                 return FALSE;
 606         }
 607
 608         return TRUE;
 609 }