Plugins/LinkConfiguration/linkconfig.c

   1 /*
   2  * Copyright (c) 2002-2007, 2011, 2013, 2015-2020 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 21, 2000             Allan Nathanson <ajn@apple.com>
  28  * - initial revision
  29  */
  30
  31
  32 #include <stdio.h>
  33 #include <unistd.h>
  34 #include <sys/ioctl.h>
  35 #include <sys/socket.h>
  36 #include <sys/wait.h>
  37 #include <net/if.h>
  38 #include <net/if_media.h>
  39
  40 #define SC_LOG_HANDLE           __log_LinkConfiguration
  41 #define SC_LOG_HANDLE_TYPE      static
  42 #include "SCNetworkConfigurationInternal.h"
  43 #include <SystemConfiguration/SCDPlugin.h>              // for _SCDPluginExecCommand
  44
  45
  46 static CFMutableDictionaryRef   baseSettings            = NULL;
  47 static CFStringRef              interfacesKey           = NULL;
  48 static SCDynamicStoreRef        store                   = NULL;
  49 static CFRunLoopSourceRef       rls                     = NULL;
  50 static CFMutableDictionaryRef   wantSettings            = NULL;
  51
  52
  53 #pragma mark -
  54 #pragma mark Logging
  55
  56
  57 static os_log_t
  58 __log_LinkConfiguration(void)
  59 {
  60         static os_log_t log     = NULL;
  61
  62         if (log == NULL) {
  63                 log = os_log_create("com.apple.SystemConfiguration", "LinkConfiguration");
  64         }
  65
  66         return log;
  67 }
  68
  69
  70 #pragma mark -
  71 #pragma mark Capabilities
  72
  73
  74 #define CAPABILITIES_KEY        CFSTR("_CAPABILITIES_")
  75
  76
  77 __private_extern__
  78 Boolean
  79 _SCNetworkInterfaceSetCapabilities(SCNetworkInterfaceRef        interface,
  80                                    CFDictionaryRef              options)
  81 {
  82         CFDictionaryRef baseOptions;
  83         int             cap_base;
  84         int             cap_current;
  85         int             cap_requested;
  86         CFStringRef     interfaceName;
  87
  88 #ifdef  SIOCSIFCAP
  89         struct ifreq    ifr;
  90         int             ret;
  91         int             sock;
  92 #endif  // SIOCSIFCAP
  93
  94         interfaceName = SCNetworkInterfaceGetBSDName(interface);
  95         if (interfaceName == NULL) {
  96                 /* if no BSD interface name */
  97                 return FALSE;
  98         }
  99
 100         cap_current = __SCNetworkInterfaceCreateCapabilities(interface, -1, NULL);
 101         if (cap_current == -1) {
 102                 /* could not get current capabilities */
 103                 return FALSE;
 104         }
 105
 106         // get base capabilities
 107         cap_base = cap_current;
 108         baseOptions = CFDictionaryGetValue(baseSettings, interfaceName);
 109         if (baseOptions != NULL) {
 110                 CFNumberRef     num;
 111
 112                 num = CFDictionaryGetValue(baseOptions, CAPABILITIES_KEY);
 113                 if (num != NULL) {
 114                         CFNumberGetValue(num, kCFNumberIntType, &cap_base);
 115                 }
 116         }
 117
 118         cap_requested = __SCNetworkInterfaceCreateCapabilities(interface, cap_base, options);
 119
 120 #ifdef  SIOCSIFCAP
 121         if (cap_requested == cap_current) {
 122                 /* if current setting is as requested */
 123                 return TRUE;
 124         }
 125
 126         memset((char *)&ifr, 0, sizeof(ifr));
 127         (void)_SC_cfstring_to_cstring(interfaceName, ifr.ifr_name, sizeof(ifr.ifr_name), kCFStringEncodingASCII);
 128         ifr.ifr_curcap = cap_current;
 129         ifr.ifr_reqcap = cap_requested;
 130
 131         sock = socket(AF_INET, SOCK_DGRAM, 0);
 132         if (sock == -1) {
 133                 SC_log(LOG_ERR, "socket() failed: %s", strerror(errno));
 134                 return FALSE;
 135         }
 136
 137         ret = ioctl(sock, SIOCSIFCAP, (caddr_t)&ifr);
 138         (void)close(sock);
 139         if (ret == -1) {
 140                 SC_log(LOG_ERR, "%@: ioctl(SIOCSIFCAP) failed: %s", interfaceName, strerror(errno));
 141                 return FALSE;
 142         }
 143 #endif  // SIOCSIFCAP
 144
 145         return TRUE;
 146 }
 147
 148
 149 #pragma mark -
 150 #pragma mark Media options
 151
 152
 153 static CFDictionaryRef
 154 __copyMediaOptions(CFDictionaryRef options)
 155 {
 156         CFMutableDictionaryRef  requested       = NULL;
 157         CFTypeRef               val;
 158
 159         if (!isA_CFDictionary(options)) {
 160                 return NULL;
 161         }
 162
 163         val = CFDictionaryGetValue(options, kSCPropNetEthernetMediaSubType);
 164         if (isA_CFString(val)) {
 165                 requested = CFDictionaryCreateMutable(NULL,
 166                                                       0,
 167                                                       &kCFTypeDictionaryKeyCallBacks,
 168                                                       &kCFTypeDictionaryValueCallBacks);
 169                 CFDictionaryAddValue(requested, kSCPropNetEthernetMediaSubType, val);
 170         } else {
 171                 /* if garbage */;
 172                 return NULL;
 173         }
 174
 175         val = CFDictionaryGetValue(options, kSCPropNetEthernetMediaOptions);
 176         if (isA_CFArray(val)) {
 177                 CFDictionaryAddValue(requested, kSCPropNetEthernetMediaOptions, val);
 178         } else {
 179                 /* if garbage */;
 180                 CFRelease(requested);
 181                 return NULL;
 182         }
 183
 184         return requested;
 185 }
 186
 187
 188 __private_extern__
 189 Boolean
 190 _SCNetworkInterfaceSetMediaOptions(SCNetworkInterfaceRef        interface,
 191                                    CFDictionaryRef              options)
 192 {
 193         CFArrayRef              available       = NULL;
 194         CFDictionaryRef         current         = NULL;
 195         struct ifmediareq       ifm;
 196         struct ifreq            ifr;
 197         CFStringRef             interfaceName;
 198         Boolean                 ok              = FALSE;
 199         int                     newOptions;
 200         CFDictionaryRef         requested;
 201         int                     sock            = -1;
 202
 203         if (!isA_SCNetworkInterface(interface)) {
 204                 _SCErrorSet(kSCStatusInvalidArgument);
 205                 return FALSE;
 206         }
 207
 208         interfaceName = SCNetworkInterfaceGetBSDName(interface);
 209         if (interfaceName == NULL) {
 210                 /* if no BSD interface name */
 211                 SC_log(LOG_INFO, "no BSD interface name for %@", interface);
 212                 _SCErrorSet(kSCStatusInvalidArgument);
 213                 return FALSE;
 214         }
 215
 216         /* get current & available options */
 217         if (!SCNetworkInterfaceCopyMediaOptions(interface, &current, NULL, &available, FALSE)) {
 218                 /* could not get current media options */
 219                 SC_log(LOG_INFO, "no media options for %@", interfaceName);
 220                 return FALSE;
 221         }
 222
 223         /* extract just the dictionary key/value pairs of interest */
 224         requested = __copyMediaOptions(options);
 225         if (requested == NULL) {
 226                 CFDictionaryRef baseOptions;
 227
 228                 /* get base options */
 229                 baseOptions = CFDictionaryGetValue(baseSettings, interfaceName);
 230                 requested = __copyMediaOptions(baseOptions);
 231         }
 232         if (requested == NULL) {
 233                 /* get base options */
 234                 requested = __copyMediaOptions(current);
 235         }
 236         if (requested == NULL) {
 237                 /* if no media options to set */
 238                 goto done;
 239         }
 240
 241         if ((current != NULL) && CFEqual(current, requested)) {
 242                 /* if current settings are as requested */
 243                 ok = TRUE;
 244                 goto done;
 245         }
 246
 247         if (!CFArrayContainsValue(available, CFRangeMake(0, CFArrayGetCount(available)), requested)) {
 248                 /* if requested settings not currently available */
 249                 SC_log(LOG_INFO, "requested media settings unavailable for %@", interfaceName);
 250                 goto done;
 251         }
 252
 253         newOptions = __SCNetworkInterfaceCreateMediaOptions(interface, requested);
 254         if (newOptions == -1) {
 255                 /* since we have just validated, this should never happen */
 256                 goto done;
 257         }
 258
 259         sock = socket(AF_INET, SOCK_DGRAM, 0);
 260         if (sock == -1) {
 261                 SC_log(LOG_ERR, "socket() failed: %s", strerror(errno));
 262                 goto done;
 263         }
 264
 265         memset((char *)&ifm, 0, sizeof(ifm));
 266         (void)_SC_cfstring_to_cstring(interfaceName, ifm.ifm_name, sizeof(ifm.ifm_name), kCFStringEncodingASCII);
 267
 268         if (ioctl(sock, SIOCGIFXMEDIA, (caddr_t)&ifm) == -1) {
 269                 SC_log(LOG_ERR, "%@: ioctl(SIOCGIFXMEDIA) failed: %s", interfaceName, strerror(errno));
 270                 goto done;
 271         }
 272
 273         memset((char *)&ifr, 0, sizeof(ifr));
 274         memcpy(ifr.ifr_name, ifm.ifm_name, sizeof(ifr.ifr_name));
 275         ifr.ifr_media =  ifm.ifm_current & ~(IFM_NMASK|IFM_TMASK|IFM_OMASK|IFM_GMASK);
 276         ifr.ifr_media |= newOptions;
 277
 278         SC_log(LOG_INFO, "old media settings: 0x%8.8x (0x%8.8x)", ifm.ifm_current, ifm.ifm_active);
 279         SC_log(LOG_INFO, "new media settings: 0x%8.8x", ifr.ifr_media);
 280
 281         if (ioctl(sock, SIOCSIFMEDIA, (caddr_t)&ifr) == -1) {
 282                 SC_log(LOG_ERR, "%@: ioctl(SIOCSIFMEDIA) failed: %s", interfaceName, strerror(errno));
 283                 goto done;
 284         }
 285
 286         ok = TRUE;
 287
 288     done :
 289
 290         if (available != NULL)  CFRelease(available);
 291         if (current != NULL)    CFRelease(current);
 292         if (requested != NULL)  CFRelease(requested);
 293         if (sock != -1) (void)close(sock);
 294
 295         return ok;
 296 }
 297
 298
 299 #pragma mark -
 300 #pragma mark MTU
 301
 302
 303 #ifndef USE_SIOCSIFMTU
 304 static void
 305 ifconfig_exit(pid_t pid, int status, struct rusage *rusage, void *context)
 306 {
 307 #pragma unused(pid)
 308 #pragma unused(rusage)
 309         char    *if_name        = (char *)context;
 310
 311         if (WIFEXITED(status)) {
 312                 if (WEXITSTATUS(status) != 0) {
 313                         SC_log(LOG_NOTICE, "ifconfig %s failed, exit status = %d",
 314                                if_name,
 315                                WEXITSTATUS(status));
 316                 }
 317         } else if (WIFSIGNALED(status)) {
 318                 SC_log(LOG_NOTICE, "ifconfig %s: terminated w/signal = %d",
 319                        if_name,
 320                        WTERMSIG(status));
 321         } else {
 322                 SC_log(LOG_NOTICE, "ifconfig %s: exit status = %d",
 323                        if_name,
 324                        status);
 325         }
 326
 327         CFAllocatorDeallocate(NULL, if_name);
 328         return;
 329 }
 330 #endif  /* !USE_SIOCSIFMTU */
 331
 332
 333 __private_extern__
 334 Boolean
 335 _SCNetworkInterfaceSetMTU(SCNetworkInterfaceRef interface,
 336                           CFDictionaryRef       options)
 337 {
 338         CFArrayRef                      bridge_members          = NULL;
 339         Boolean                         bridge_updated          = FALSE;
 340         CFStringRef                     interfaceName;
 341         SCNetworkInterfacePrivateRef    interfacePrivate        = (SCNetworkInterfacePrivateRef)interface;
 342         CFStringRef                     interfaceType;
 343         int                             mtu_cur                 = -1;
 344         int                             mtu_max                 = -1;
 345         int                             mtu_min                 = -1;
 346         Boolean                         ok                      = TRUE;
 347         int                             requested;
 348         CFNumberRef                     val;
 349
 350         interfaceName = SCNetworkInterfaceGetBSDName(interface);
 351         if (interfaceName == NULL) {
 352                 /* if no BSD interface name */
 353                 return FALSE;
 354         }
 355
 356         if (!SCNetworkInterfaceCopyMTU(interface, &mtu_cur, &mtu_min, &mtu_max)) {
 357                 /* could not get current MTU */
 358                 return FALSE;
 359         }
 360
 361         val = NULL;
 362         if (isA_CFDictionary(options)) {
 363                 val = CFDictionaryGetValue(options, kSCPropNetEthernetMTU);
 364                 val = isA_CFNumber(val);
 365         }
 366         if (val == NULL) {
 367                 CFDictionaryRef baseOptions;
 368
 369                 /* get base MTU */
 370                 baseOptions = CFDictionaryGetValue(baseSettings, interfaceName);
 371                 if (baseOptions != NULL) {
 372                         val = CFDictionaryGetValue(baseOptions, kSCPropNetEthernetMTU);
 373                 }
 374         }
 375         if (val != NULL) {
 376                 CFNumberGetValue(val, kCFNumberIntType, &requested);
 377         } else {
 378                 requested = mtu_cur;
 379         }
 380
 381         if (requested == mtu_cur) {
 382                 /* if current setting is as requested */
 383                 return TRUE;
 384         }
 385
 386         if (((mtu_min >= 0) && (requested < mtu_min)) ||
 387             ((mtu_max >= 0) && (requested > mtu_max))) {
 388                 /* if requested MTU outside of the valid range */
 389                 return FALSE;
 390         }
 391
 392         interfaceType = SCNetworkInterfaceGetInterfaceType(interface);
 393         if (CFEqual(interfaceType, kSCNetworkInterfaceTypeBridge)) {
 394                 bridge_members = SCBridgeInterfaceGetMemberInterfaces(interface);
 395                 if ((bridge_members != NULL) && (CFArrayGetCount(bridge_members) == 0)) {
 396                         /* if no members */
 397                         bridge_members = NULL;
 398                 }
 399                 if (bridge_members != NULL) {
 400                         SCNetworkInterfaceRef   member0;
 401
 402                         /* temporarily, remove all bridge members */
 403                         CFRetain(bridge_members);
 404                         ok = SCBridgeInterfaceSetMemberInterfaces(interface, NULL);
 405                         if (!ok) {
 406                                 goto done;
 407                         }
 408
 409                         /* and update the (bridge) configuration */
 410                         ok = _SCBridgeInterfaceUpdateConfiguration(interfacePrivate->prefs);
 411                         if (!ok) {
 412                                 goto done;
 413                         }
 414
 415                         /* switch from updating the MTU of the bridge to the first member */
 416                         member0 = CFArrayGetValueAtIndex(bridge_members, 0);
 417                         interfaceName = SCNetworkInterfaceGetBSDName(member0);
 418
 419                         bridge_updated = TRUE;
 420                 }
 421         }
 422
 423 #ifdef  USE_SIOCSIFMTU
 424 {
 425         struct ifreq    ifr;
 426         int             ret;
 427         int             sock;
 428
 429         memset((char *)&ifr, 0, sizeof(ifr));
 430         (void)_SC_cfstring_to_cstring(interfaceName, ifr.ifr_name, sizeof(ifr.ifr_name), kCFStringEncodingASCII);
 431         ifr.ifr_mtu = requested;
 432
 433         sock = socket(AF_INET, SOCK_DGRAM, 0);
 434         if (sock == -1) {
 435                 SC_log(LOG_ERR, "socket() failed: %s", strerror(errno));
 436                 ok = FALSE;
 437                 goto done;
 438         }
 439
 440         ret = ioctl(sock, SIOCSIFMTU, (caddr_t)&ifr);
 441         (void)close(sock);
 442         if (ret == -1) {
 443                 SC_log(LOG_ERR, "%@: ioctl(SIOCSIFMTU) failed: %s", interfaceName, strerror(errno));
 444                 ok = FALSE;
 445                 goto done;
 446         }
 447 }
 448 #else   /* !USE_SIOCSIFMTU */
 449 {
 450         char    *ifconfig_argv[] = { "ifconfig", NULL, "mtu", NULL, NULL };
 451         pid_t   pid;
 452
 453         ifconfig_argv[1] = _SC_cfstring_to_cstring(interfaceName, NULL, 0, kCFStringEncodingASCII);
 454         (void)asprintf(&ifconfig_argv[3], "%d", requested);
 455
 456         pid = _SCDPluginExecCommand(ifconfig_exit,      // callout,
 457                                     ifconfig_argv[1],   // context
 458                                     0,                  // uid
 459                                     0,                  // gid
 460                                     "/sbin/ifconfig",   // path
 461                                     ifconfig_argv       // argv
 462                                    );
 463
 464 //      CFAllocatorDeallocate(NULL, ifconfig_argv[1]);  // released in ifconfig_exit()
 465         free(ifconfig_argv[3]);
 466
 467         if (pid <= 0) {
 468                 ok = FALSE;
 469                 goto done;
 470         }
 471 }
 472 #endif  /* !USE_SIOCSIFMTU */
 473
 474     done :
 475
 476         if (bridge_members != NULL) {
 477                 /* restore bridge members */
 478                 (void) SCBridgeInterfaceSetMemberInterfaces(interface, bridge_members);
 479                 CFRelease(bridge_members);
 480
 481                 if (bridge_updated) {
 482                         /* and update the (bridge) configuration */
 483                         (void) _SCBridgeInterfaceUpdateConfiguration(interfacePrivate->prefs);
 484                 }
 485         }
 486
 487         return ok;
 488 }
 489
 490
 491 #pragma mark -
 492 #pragma mark Update link configuration
 493
 494
 495 /*
 496  * Function: parse_component
 497  * Purpose:
 498  *   Given a string 'key' and a string prefix 'prefix',
 499  *   return the next component in the slash '/' separated
 500  *   key.
 501  *
 502  * Examples:
 503  * 1. key = "a/b/c" prefix = "a/"
 504  *    returns "b"
 505  * 2. key = "a/b/c" prefix = "a/b/"
 506  *    returns "c"
 507  */
 508 static CF_RETURNS_RETAINED CFStringRef
 509 parse_component(CFStringRef key, CFStringRef prefix)
 510 {
 511         CFMutableStringRef      comp;
 512         CFRange                 range;
 513
 514         if (!CFStringHasPrefix(key, prefix)) {
 515                 return NULL;
 516         }
 517         comp = CFStringCreateMutableCopy(NULL, 0, key);
 518         CFStringDelete(comp, CFRangeMake(0, CFStringGetLength(prefix)));
 519         range = CFStringFind(comp, CFSTR("/"), 0);
 520         if (range.location == kCFNotFound) {
 521                 return comp;
 522         }
 523         range.length = CFStringGetLength(comp) - range.location;
 524         CFStringDelete(comp, range);
 525         return comp;
 526 }
 527
 528
 529 static void updateLink(CFStringRef interfaceName, CFDictionaryRef options);
 530
 531
 532 static void
 533 updateInterfaces(CFArrayRef newInterfaces)
 534 {
 535         CFIndex                 i;
 536         CFIndex                 n_old;
 537         CFIndex                 n_new;
 538         static CFArrayRef       oldInterfaces   = NULL;
 539
 540         n_old = (oldInterfaces != NULL) ? CFArrayGetCount(oldInterfaces) : 0;
 541         n_new = CFArrayGetCount(newInterfaces);
 542
 543         for (i = 0; i < n_new; i++) {
 544                 CFStringRef     interfaceName;
 545
 546                 interfaceName = CFArrayGetValueAtIndex(newInterfaces, i);
 547
 548                 if ((n_old == 0) ||
 549                     !CFArrayContainsValue(oldInterfaces,
 550                                           CFRangeMake(0, n_old),
 551                                           interfaceName)) {
 552                         CFDictionaryRef options;
 553
 554                         // if new interface
 555                         options = CFDictionaryGetValue(wantSettings, interfaceName);
 556                         updateLink(interfaceName, options);
 557                 }
 558         }
 559
 560         if (oldInterfaces != NULL) CFRelease(oldInterfaces);
 561         oldInterfaces = CFRetain(newInterfaces);
 562 }
 563
 564
 565 static void
 566 updateLink(CFStringRef interfaceName, CFDictionaryRef options)
 567 {
 568         SCNetworkInterfaceRef   interface;
 569
 570         /* retain requested configuration */
 571         if (options != NULL) {
 572                 CFDictionarySetValue(wantSettings, interfaceName, options);
 573         } else {
 574                 CFDictionaryRemoveValue(wantSettings, interfaceName);
 575         }
 576
 577         /* apply requested configuration */
 578         interface = _SCNetworkInterfaceCreateWithBSDName(NULL, interfaceName,
 579                                                          kIncludeAllVirtualInterfaces);
 580         if (interface == NULL) {
 581                 return;
 582         }
 583
 584         if (options != NULL) {
 585                 if (!CFDictionaryContainsKey(baseSettings, interfaceName)) {
 586                         int                     cur_cap         = -1;
 587                         CFDictionaryRef         cur_media       = NULL;
 588                         CFMutableDictionaryRef  new_media       = NULL;
 589                         int                     cur_mtu         = -1;
 590
 591                         /* preserve current media options */
 592                         if (SCNetworkInterfaceCopyMediaOptions(interface, &cur_media, NULL, NULL, FALSE)) {
 593                                 if (cur_media != NULL) {
 594                                         new_media = CFDictionaryCreateMutableCopy(NULL, 0, cur_media);
 595                                         CFRelease(cur_media);
 596                                 }
 597                         }
 598
 599                         /* preserve current MTU */
 600                         if (SCNetworkInterfaceCopyMTU(interface, &cur_mtu, NULL, NULL)) {
 601                                 if (cur_mtu != -1) {
 602                                         CFNumberRef     num;
 603
 604                                         if (new_media == NULL) {
 605                                                 new_media = CFDictionaryCreateMutable(NULL,
 606                                                                                       0,
 607                                                                                       &kCFTypeDictionaryKeyCallBacks,
 608                                                                                       &kCFTypeDictionaryValueCallBacks);
 609                                         }
 610
 611                                         num = CFNumberCreate(NULL, kCFNumberIntType, &cur_mtu);
 612                                         CFDictionaryAddValue(new_media, kSCPropNetEthernetMTU, num);
 613                                         CFRelease(num);
 614                                 }
 615                         }
 616
 617                         /* preserve capabilities */
 618                         cur_cap = __SCNetworkInterfaceCreateCapabilities(interface, -1, NULL);
 619                         if (cur_cap != -1) {
 620                                 CFNumberRef     num;
 621
 622                                 if (new_media == NULL) {
 623                                         new_media = CFDictionaryCreateMutable(NULL,
 624                                                                               0,
 625                                                                               &kCFTypeDictionaryKeyCallBacks,
 626                                                                               &kCFTypeDictionaryValueCallBacks);
 627                                 }
 628
 629                                 num = CFNumberCreate(NULL, kCFNumberIntType, &cur_cap);
 630                                 CFDictionaryAddValue(new_media, CAPABILITIES_KEY, num);
 631                                 CFRelease(num);
 632                         }
 633
 634                         if (new_media != NULL) {
 635                                 CFDictionarySetValue(baseSettings, interfaceName, new_media);
 636                                 CFRelease(new_media);
 637                         }
 638                 }
 639
 640                 /* establish new settings */
 641                 (void)_SCNetworkInterfaceSetCapabilities(interface, options);
 642                 (void)_SCNetworkInterfaceSetMediaOptions(interface, options);
 643                 (void)_SCNetworkInterfaceSetMTU         (interface, options);
 644         } else {
 645                 /* no requested settings */
 646                 options = CFDictionaryGetValue(baseSettings, interfaceName);
 647                 if (options != NULL) {
 648                         /* restore original settings */
 649                         (void)_SCNetworkInterfaceSetCapabilities(interface, options);
 650                         (void)_SCNetworkInterfaceSetMediaOptions(interface, options);
 651                         (void)_SCNetworkInterfaceSetMTU         (interface, options);
 652                         CFDictionaryRemoveValue(baseSettings, interfaceName);
 653                 }
 654         }
 655
 656         CFRelease(interface);
 657         return;
 658 }
 659
 660
 661 static void
 662 linkConfigChangedCallback(SCDynamicStoreRef store, CFArrayRef changedKeys, void *arg)
 663 {
 664 #pragma unused(arg)
 665         CFDictionaryRef         changes;
 666         CFIndex                 i;
 667         CFIndex                 n;
 668         static CFStringRef      prefix          = NULL;
 669
 670         if (prefix == NULL) {
 671                 prefix = SCDynamicStoreKeyCreate(NULL,
 672                                                  CFSTR("%@/%@/%@/"),
 673                                                  kSCDynamicStoreDomainSetup,
 674                                                  kSCCompNetwork,
 675                                                  kSCCompInterface);
 676         }
 677
 678         changes = SCDynamicStoreCopyMultiple(store, changedKeys, NULL);
 679
 680         n = (changes != NULL) ? CFArrayGetCount(changedKeys) : 0;
 681         for (i = 0; i < n; i++) {
 682                 CFStringRef     key;
 683                 CFDictionaryRef info;
 684
 685                 key  = CFArrayGetValueAtIndex(changedKeys, i);
 686                 info = CFDictionaryGetValue(changes, key);
 687
 688                 if (CFEqual(key, interfacesKey)) {
 689                         if (isA_CFDictionary(info) != NULL) {
 690                                 CFArrayRef      interfaces;
 691
 692                                 interfaces = CFDictionaryGetValue(info, kSCPropNetInterfaces);
 693                                 if (isA_CFArray(interfaces)) {
 694                                         updateInterfaces(interfaces);
 695                                 }
 696                         }
 697                 } else {
 698                         CFStringRef     interfaceName;
 699
 700                         interfaceName = parse_component(key, prefix);
 701                         if (interfaceName != NULL) {
 702                                 updateLink(interfaceName, info);
 703                                 CFRelease(interfaceName);
 704                         }
 705                 }
 706         }
 707
 708         if (changes != NULL) {
 709                 CFRelease(changes);
 710         }
 711
 712         return;
 713 }
 714
 715
 716 __private_extern__
 717 void
 718 load_LinkConfiguration(CFBundleRef bundle, Boolean bundleVerbose)
 719 {
 720 #pragma unused(bundleVerbose)
 721         CFStringRef             key;
 722         CFMutableArrayRef       keys            = NULL;
 723         Boolean                 ok;
 724         CFMutableArrayRef       patterns        = NULL;
 725
 726         SC_log(LOG_DEBUG, "load() called");
 727         SC_log(LOG_DEBUG, "  bundle ID = %@", CFBundleGetIdentifier(bundle));
 728
 729         /* initialize a few globals */
 730
 731         baseSettings = CFDictionaryCreateMutable(NULL,
 732                                                  0,
 733                                                  &kCFTypeDictionaryKeyCallBacks,
 734                                                  &kCFTypeDictionaryValueCallBacks);
 735         wantSettings = CFDictionaryCreateMutable(NULL,
 736                                                  0,
 737                                                  &kCFTypeDictionaryKeyCallBacks,
 738                                                  &kCFTypeDictionaryValueCallBacks);
 739
 740         /* open a "configd" store to allow cache updates */
 741         store = SCDynamicStoreCreate(NULL,
 742                                      CFSTR("Link Configuraton plug-in"),
 743                                      linkConfigChangedCallback,
 744                                      NULL);
 745         if (store == NULL) {
 746                 SC_log(LOG_ERR, "SCDynamicStoreCreate() failed: %s", SCErrorString(SCError()));
 747                 goto error;
 748         }
 749
 750         /* establish notification keys and patterns */
 751         keys     = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
 752         patterns = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
 753
 754         /* ...watch for a change in the list of network interfaces */
 755         interfacesKey = SCDynamicStoreKeyCreateNetworkInterface(NULL,
 756                                                                 kSCDynamicStoreDomainState);
 757         CFArrayAppendValue(keys, interfacesKey);
 758
 759         /* ...watch for (per-interface) AirPort configuration changes */
 760         key = SCDynamicStoreKeyCreateNetworkInterfaceEntity(NULL,
 761                                                             kSCDynamicStoreDomainSetup,
 762                                                             kSCCompAnyRegex,
 763                                                             kSCEntNetAirPort);
 764         CFArrayAppendValue(patterns, key);
 765         CFRelease(key);
 766
 767         /* ...watch for (per-interface) Ethernet configuration changes */
 768         key = SCDynamicStoreKeyCreateNetworkInterfaceEntity(NULL,
 769                                                             kSCDynamicStoreDomainSetup,
 770                                                             kSCCompAnyRegex,
 771                                                             kSCEntNetEthernet);
 772         CFArrayAppendValue(patterns, key);
 773         CFRelease(key);
 774
 775 #if     TARGET_OS_OSX
 776         /* ...watch for (per-interface) FireWire configuration changes */
 777         key = SCDynamicStoreKeyCreateNetworkInterfaceEntity(NULL,
 778                                                             kSCDynamicStoreDomainSetup,
 779                                                             kSCCompAnyRegex,
 780                                                             kSCEntNetFireWire);
 781         CFArrayAppendValue(patterns, key);
 782         CFRelease(key);
 783 #endif  // TARGET_OS_OSX
 784
 785         /* register the keys/patterns */
 786         ok = SCDynamicStoreSetNotificationKeys(store, keys, patterns);
 787         CFRelease(keys);
 788         CFRelease(patterns);
 789         if (!ok) {
 790                 SC_log(LOG_NOTICE, "SCDynamicStoreSetNotificationKeys() failed: %s",
 791                        SCErrorString(SCError()));
 792                 goto error;
 793         }
 794
 795         rls = SCDynamicStoreCreateRunLoopSource(NULL, store, 0);
 796         if (rls == NULL) {
 797                 SC_log(LOG_NOTICE, "SCDynamicStoreCreateRunLoopSource() failed: %s",
 798                        SCErrorString(SCError()));
 799                 goto error;
 800         }
 801
 802         CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode);
 803         return;
 804
 805     error :
 806
 807         if (baseSettings != NULL)       CFRelease(baseSettings);
 808         if (wantSettings != NULL)       CFRelease(wantSettings);
 809         if (store != NULL)              CFRelease(store);
 810         return;
 811 }
 812
 813
 814 #ifdef  MAIN
 815
 816
 817 #pragma mark -
 818 #pragma mark Standalone test code
 819
 820
 821 int
 822 main(int argc, char **argv)
 823 {
 824         SCPreferencesRef        prefs;
 825
 826         _sc_log     = kSCLogDestinationFile;
 827         _sc_verbose = (argc > 1) ? TRUE : FALSE;
 828
 829         prefs = SCPreferencesCreate(NULL, CFSTR("linkconfig"), NULL);
 830         if (prefs != NULL) {
 831                 SCNetworkSetRef set;
 832
 833                 set = SCNetworkSetCopyCurrent(prefs);
 834                 if (set != NULL) {
 835                         CFMutableSetRef seen;
 836                         CFArrayRef      services;
 837
 838                         services = SCNetworkSetCopyServices(set);
 839                         if (services != NULL) {
 840                                 CFIndex         i;
 841                                 CFIndex         n;
 842
 843                                 seen = CFSetCreateMutable(NULL, 0, &kCFTypeSetCallBacks);
 844
 845                                 n = CFArrayGetCount(services);
 846                                 for (i = 0; i < n; i++) {
 847                                         SCNetworkInterfaceRef   interface;
 848                                         SCNetworkServiceRef     service;
 849
 850                                         service = CFArrayGetValueAtIndex(services, i);
 851                                         interface = SCNetworkServiceGetInterface(service);
 852                                         if ((interface != NULL) &&
 853                                             !CFSetContainsValue(seen, interface)) {
 854                                                 CFDictionaryRef capabilities;
 855
 856                                                 capabilities = SCNetworkInterfaceCopyCapability(interface, NULL);
 857                                                 if (capabilities != NULL) {
 858                                                         int             cap_current;
 859                                                         int             cap_requested;
 860                                                         CFDictionaryRef options;
 861
 862                                                         options = SCNetworkInterfaceGetConfiguration(interface);
 863                                                         cap_current   = __SCNetworkInterfaceCreateCapabilities(interface, -1, NULL);
 864                                                         cap_requested = __SCNetworkInterfaceCreateCapabilities(interface, cap_current, options);
 865
 866                                                         SCPrint(TRUE, stdout,
 867                                                                 CFSTR("%sinterface = %@, current = %p, requested = %p\n%@\n"),
 868                                                                 (i == 0) ? "" : "\n",
 869                                                                 SCNetworkInterfaceGetBSDName(interface),
 870                                                                 (void *)(uintptr_t)cap_current,
 871                                                                 (void *)(uintptr_t)cap_requested,
 872                                                                 capabilities);
 873                                                         CFRelease(capabilities);
 874                                                 }
 875
 876                                                 CFSetAddValue(seen, interface);
 877                                         }
 878                                 }
 879
 880                                 CFRelease(seen);
 881                                 CFRelease(services);
 882                         }
 883
 884                         CFRelease(set);
 885                 }
 886
 887                 CFRelease(prefs);
 888         }
 889
 890         load_LinkConfiguration(CFBundleGetMainBundle(), (argc > 1) ? TRUE : FALSE);
 891         CFRunLoopRun();
 892         /* not reached */
 893         exit(0);
 894         return 0;
 895 }
 896 #endif