mDNSMacOSX/Bonjour Safari Extension/CNServiceBrowserView.m

   1 /*
   2  * Copyright (c) 2017-2019 Apple Inc. All rights reserved.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #import "CNServiceBrowserView.h"
  18 #import "CNDomainBrowserPathUtils.h"
  19 #include <dns_sd.h>
  20
  21 #import <SafariServices/SafariServices.h>
  22
  23 #define SHOW_SERVICETYPE_IF_SEARCH_COUNT        0
  24
  25 const NSString *    _CNInstanceKey_fullName             = @"fullName";
  26 const NSString *    _CNInstanceKey_name                 = @"name";
  27 const NSString *    _CNInstanceKey_serviceType          = @"serviceType";
  28 const NSString *    _CNInstanceKey_domainPath           = @"domainPath";
  29 const NSString *    _CNInstanceKey_resolveUrl           = @"resolveUrl";
  30 const NSString *    _CNInstanceKey_resolveInstance      = @"resolveInstance";
  31
  32 @interface _DNSServiceRefWrapper : NSObject
  33 {
  34     DNSServiceRef    _ref;
  35 }
  36
  37 - (instancetype)initWithRef:(DNSServiceRef)ref;
  38 @end
  39
  40 @implementation _DNSServiceRefWrapper
  41
  42 - (instancetype)initWithRef:(DNSServiceRef)ref
  43 {
  44     if( self = [super init] )
  45     {
  46         _ref = ref;
  47     }
  48     return( self );
  49 }
  50
  51 - (void)dealloc
  52 {
  53     if( _ref ) DNSServiceRefDeallocate( _ref );
  54 }
  55
  56 @end
  57
  58 @implementation NSArray( CaseInsensitiveStringArrayCompare )
  59
  60 - (BOOL)caseInsensitiveStringMatch:(NSArray *)inArray
  61 {
  62     BOOL match = YES;
  63
  64     if( self.count != [inArray count] )    match = NO;    //    Nil zero len ok
  65     else
  66     {
  67         NSInteger    i = 0;
  68         for( NSString * next in self )
  69         {
  70             NSString * inNext = inArray[i++];
  71             if( ![inNext isKindOfClass: [NSString class]] || ![next isKindOfClass: [NSString class]] )
  72             {
  73                 match = NO;
  74                 break;
  75             }
  76             else if( [next caseInsensitiveCompare: inNext] != NSOrderedSame )
  77             {
  78                 match = NO;
  79                 break;
  80             }
  81         }
  82     }
  83
  84     return( match );
  85 }
  86
  87 @end
  88
  89 @protocol CNServiceTypeLocalizerDelegate <NSObject>
  90 @property (strong) NSDictionary * localizedServiceTypesDictionary;
  91 @end
  92
  93 @interface CNServiceTypeLocalizer : NSValueTransformer
  94 {
  95         id<CNServiceTypeLocalizerDelegate>      _delegate;
  96 }
  97 - (instancetype)initWithDelegate:(id<CNServiceTypeLocalizerDelegate>)delegate;
  98
  99 @end
 100
 101 @implementation CNServiceTypeLocalizer
 102
 103 - (instancetype)initWithDelegate:(id<CNServiceTypeLocalizerDelegate>)delegate
 104 {
 105         if( self = [super init] )
 106         {
 107                 _delegate = delegate;
 108         }
 109         return( self );
 110 }
 111
 112 + (Class)transformedValueClass
 113 {
 114         return [NSString class];
 115 }
 116
 117 + (BOOL)allowsReverseTransformation
 118 {
 119         return NO;
 120 }
 121
 122 - (nullable id)transformedValue:(nullable id)value
 123 {
 124         id      result = value;
 125
 126         if( value && _delegate && [_delegate respondsToSelector: @selector(localizedServiceTypesDictionary)] )
 127         {
 128                 NSString *      localizedValue = [_delegate.localizedServiceTypesDictionary objectForKey: value];
 129                 if( localizedValue ) result = localizedValue;
 130         }
 131
 132         return( result );
 133 }
 134
 135 @end
 136
 137 @implementation NSBrowser( PathArray )
 138
 139 - (NSArray *)pathArrayToColumn:(NSInteger)column includeSelectedRow:(BOOL)includeSelection
 140 {
 141         NSMutableArray * pathArray = [NSMutableArray array];
 142         if( !includeSelection ) column--;
 143         for( NSInteger c = 0 ; c <= column ; c++ )
 144         {
 145                 NSBrowserCell *cell = [self selectedCellInColumn: c];
 146                 if( cell ) [pathArray addObject: [cell stringValue]];
 147         }
 148
 149         return( pathArray );
 150 }
 151
 152 @end
 153
 154 static void resolveReply( DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interfaceIndex, DNSServiceErrorType errorCode, const char *fullname, const char *hosttarget, uint16_t port, uint16_t txtLen, const unsigned char *txtRecord, void *context );
 155 static void browseReply( DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interfaceIndex, DNSServiceErrorType errorCode, const char *serviceName, const char *regtype, const char *replyDomain, void *context );
 156
 157 @interface CNServiceBrowserView ()
 158
 159 @property (strong) NSTableView  *                       instanceTable;
 160 @property (strong) NSArrayController *          instanceC;
 161 @property (strong) NSTableColumn *                      instanceNameColumn;
 162 @property (strong) NSTableColumn *                      instanceServiceTypeColumn;
 163 @property (strong) NSTableColumn *                      instancePathPopupColumn;
 164
 165 @property (strong) CNServiceTypeLocalizer * serviceTypeLocalizer;
 166
 167 @property (strong) NSArray *                currentDomainPath;
 168 @property (strong) NSMutableArray *         instanceRs;
 169 @property (strong) NSMutableDictionary *    instanceD;
 170 @property (strong) NSMutableArray *         instanceA;
 171
 172 @property (strong) dispatch_queue_t         instanceBrowseQ;
 173
 174 @end
 175
 176 @implementation CNServiceBrowserView
 177
 178 @synthesize serviceTypes = _serviceTypes;
 179
 180 - (instancetype)initWithFrame:(NSRect)frameRect
 181 {
 182         if( self = [super initWithFrame: frameRect] )
 183         {
 184                 [self commonInit];
 185         }
 186         return( self );
 187 }
 188
 189 - (nullable instancetype)initWithCoder:(NSCoder *)coder
 190 {
 191         if( self = [super initWithCoder: coder] )
 192         {
 193                 [self commonInit];
 194         }
 195         return( self );
 196 }
 197
 198
 199 - (void)contentViewsInit
 200 {
 201         NSRect  frame = self.frame;
 202         self.instanceC = [[NSArrayController alloc] init];
 203         self.serviceTypeLocalizer = [[CNServiceTypeLocalizer alloc] initWithDelegate: (id<CNServiceTypeLocalizerDelegate>)self];
 204
 205         //      My table view
 206         NSTableView * tableView = [[NSTableView alloc] initWithFrame: frame];
 207         tableView.columnAutoresizingStyle = NSTableViewFirstColumnOnlyAutoresizingStyle;
 208         tableView.allowsColumnReordering = NO;
 209         tableView.delegate = (id<NSTableViewDelegate>)self;
 210     tableView.doubleAction = @selector( doubleAction:);
 211         [tableView bind: NSContentBinding toObject: self.instanceC withKeyPath: @"arrangedObjects" options: nil];
 212         self.instanceTable = tableView;
 213
 214         //      Scroll view for table
 215         NSScrollView * tableContainer = [[NSScrollView alloc] initWithFrame: frame];
 216         tableContainer.autoresizingMask = (NSViewHeightSizable | NSViewWidthSizable);
 217         [tableContainer setDocumentView: tableView];
 218
 219         //      Name column
 220         NSTableColumn * column = [[NSTableColumn alloc] init];
 221         column.resizingMask = (NSTableColumnAutoresizingMask);
 222         column.width = frame.size.width / 3;
 223         column.minWidth = column.width / 2;
 224         NSTextFieldCell * cell = [[NSTextFieldCell alloc] init];
 225         cell.truncatesLastVisibleLine = YES;
 226         column.dataCell = cell;
 227         [column.headerCell setStringValue: NSLocalizedString( @"_dnsBrowser.instances.name", nil )];
 228         [column bind: NSValueBinding toObject: self.instanceC withKeyPath: @"arrangedObjects.name" options: nil];
 229         [tableView addTableColumn: column];
 230         self.instanceNameColumn = column;
 231
 232         //      Service type column
 233         column = [[NSTableColumn alloc] init];
 234         column.resizingMask = (NSTableColumnNoResizing);
 235         column.width = frame.size.width / 3;
 236         column.dataCell = [[NSTextFieldCell alloc] init];
 237         [column.headerCell setStringValue: NSLocalizedString( @"_dnsBrowser.instances.type", nil )];
 238         [column bind: NSValueBinding toObject: self.instanceC withKeyPath: @"arrangedObjects.serviceType" options: @{ NSValueTransformerBindingOption: self.serviceTypeLocalizer }];
 239         [tableView addTableColumn: column];
 240         self.instanceServiceTypeColumn = column;
 241
 242         //      Path popup column
 243         column = [[NSTableColumn alloc] init];
 244         column.resizingMask = (NSTableColumnNoResizing);
 245         column.width = frame.size.width / 3;
 246         NSPopUpButtonCell * popUpCell = [[NSPopUpButtonCell alloc] init];
 247         popUpCell.pullsDown = YES;
 248         popUpCell.arrowPosition = NSPopUpArrowAtBottom;
 249         popUpCell.autoenablesItems = YES;
 250         popUpCell.preferredEdge = NSRectEdgeMaxY;
 251     popUpCell.bezelStyle = NSBezelStyleTexturedSquare;
 252         popUpCell.font = [NSFont systemFontOfSize: [NSFont smallSystemFontSize]];
 253         column.dataCell = popUpCell;
 254         [column.headerCell setStringValue: NSLocalizedString( @"_dnsBrowser.instances.domain", nil )];
 255         [column bind: NSContentBinding toObject: self.instanceC withKeyPath: @"arrangedObjects.domainPath" options: nil];
 256         [tableView addTableColumn: column];
 257         self.instancePathPopupColumn = column;
 258
 259         [self addSubview: tableContainer];
 260 }
 261
 262 - (void)commonInit
 263 {
 264     self.serviceTypes = @[@"_http._tcp"];
 265     self.instanceRs = [NSMutableArray array];
 266     self.instanceD = [NSMutableDictionary dictionary];
 267     self.instanceA = [NSMutableArray array];
 268
 269     [self contentViewsInit];
 270 }
 271
 272 - (void) setServiceTypes:(NSArray *)serviceTypes
 273 {
 274         if( ![_serviceTypes isEqualTo: serviceTypes] )
 275         {
 276                 _serviceTypes = serviceTypes;
 277         }
 278 }
 279
 280 - (NSArray *) serviceTypes
 281 {
 282         return( _serviceTypes );
 283 }
 284
 285 - (BOOL)foundInstancesWithMoreThanOneServiceType
 286 {
 287     BOOL result = NO;
 288
 289 #if SHOW_SERVICETYPE_IF_SEARCH_COUNT
 290     result = (_serviceTypes.count > 1);
 291 #else
 292     if( _instanceD.count )
 293     {
 294         NSString * serviceType;
 295         for( NSDictionary *next in [_instanceD allValues] )
 296         {
 297             if( !serviceType )
 298             {
 299                 serviceType = next[_CNInstanceKey_serviceType];
 300                 continue;
 301             }
 302             else if( [next[_CNInstanceKey_serviceType] caseInsensitiveCompare: serviceType] != NSOrderedSame )
 303             {
 304                 result = YES;
 305                 break;
 306             }
 307         }
 308     }
 309 #endif
 310
 311     return( result );
 312 }
 313
 314 - (BOOL)foundInstancesInMoreThanCurrentDomainPath
 315 {
 316     BOOL result = NO;
 317
 318     if( _instanceD.count )
 319     {
 320         NSArray * selectedPathArray = [[_currentDomainPath reverseObjectEnumerator] allObjects];
 321         if( !selectedPathArray.count ) selectedPathArray = [NSArray arrayWithObject: @"local"];
 322         for( NSDictionary *next in [_instanceD allValues] )
 323         {
 324             if( [next[_CNInstanceKey_domainPath] caseInsensitiveStringMatch: selectedPathArray] )    continue;
 325             else
 326             {
 327                 result = YES;
 328                 break;
 329             }
 330         }
 331     }
 332
 333 #if DEBUG_DOMAIN_POPUPS
 334     return( YES );
 335 #else
 336     return( result );
 337 #endif
 338 }
 339
 340 #pragma mark - Notifications
 341
 342 - (void)tableViewSelectionDidChange:(NSNotification *)notification
 343 {
 344         if( _delegate && [_delegate respondsToSelector: @selector(bonjourServiceSelected:type:atDomain:)] &&
 345             notification.object == self.instanceTable )
 346         {
 347                 NSTableView * table = (NSTableView *)notification.object;
 348                 NSDictionary * record = nil;
 349                 if( table.selectedRow >= 0 && table.selectedRow < (NSInteger)[self.instanceC.content count] ) record = (NSDictionary *)self.instanceC.content[table.selectedRow];
 350
 351         [_delegate bonjourServiceSelected: record[_CNInstanceKey_name]
 352                                      type: record[_CNInstanceKey_serviceType]
 353                                  atDomain: record ? DomainPathToDNSDomain( [[record[_CNInstanceKey_domainPath] reverseObjectEnumerator] allObjects] ) : nil];
 354     }
 355 }
 356
 357
 358 #pragma mark - Delegates
 359
 360 - (void)tableView:(NSTableView *)tableView willDisplayCell:(id)cell forTableColumn:(nullable NSTableColumn *)tableColumn row:(NSInteger)row
 361 {
 362     (void)tableColumn;    // Unused
 363     (void)row;            // Unused
 364     if( tableView == self.instanceTable )
 365         {
 366                 if( [cell isKindOfClass: [NSPopUpButtonCell class]] )
 367                 {
 368                         NSPopUpButtonCell *     popCell = cell;
 369                         if( popCell.numberOfItems > 1  )        popCell.arrowPosition = NSPopUpArrowAtBottom;
 370                         else                                                            popCell.arrowPosition = NSPopUpNoArrow;
 371                 }
 372         }
 373 }
 374
 375 #if 0
 376 - (void)tableView:(NSTableView *)tableView didClickTableColumn:(NSTableColumn *)tableColumn
 377 {
 378 }
 379 #endif
 380
 381 - (void) handleBrowseResults
 382 {
 383     dispatch_async( dispatch_get_main_queue(), ^{
 384         [self bonjourBrowserServiceBrowseUpdate: self->_instanceA];
 385     });
 386 }
 387
 388 - (void)bonjourBrowserServiceBrowseUpdate:(NSArray *)services
 389 {
 390     self.instanceC.content = [services sortedArrayUsingComparator: ^( id obj1, id obj2 ) {
 391         return (NSComparisonResult)[ obj1[_CNInstanceKey_name] compare: obj2[_CNInstanceKey_name]];
 392     }];
 393     [self adjustInstancesColumnWidths];
 394 }
 395
 396 - (void) adjustInstancesColumnWidths
 397 {
 398     self.instanceServiceTypeColumn.hidden = ![self foundInstancesWithMoreThanOneServiceType];
 399     self.instancePathPopupColumn.hidden = ![self foundInstancesInMoreThanCurrentDomainPath];
 400
 401     if( !self.instanceServiceTypeColumn.hidden || !self.instancePathPopupColumn.hidden )
 402     {
 403         BOOL        sizeChanged = NO;
 404         CGFloat        maxWidthType = 0;
 405         CGFloat        maxWidthDomain = 0;
 406         BOOL        needRoomForPopup = NO;
 407         NSDictionary * fontAttrType = @{ NSFontAttributeName: ((NSTextFieldCell *)self.instanceServiceTypeColumn.dataCell).font };
 408         NSDictionary * fontAttrDomain = @{ NSFontAttributeName: ((NSTextFieldCell *)self.instancePathPopupColumn.dataCell).font };
 409
 410         for( NSDictionary * next in self.instanceC.content )
 411         {
 412             NSString * serviceType = [self.serviceTypeLocalizer transformedValue: next[_CNInstanceKey_serviceType]];
 413             NSSize        nextSize = [serviceType sizeWithAttributes: fontAttrType];
 414             maxWidthType = MAX( nextSize.width, maxWidthType );
 415
 416             NSArray *    path = next[_CNInstanceKey_domainPath];
 417             nextSize = [path[0] sizeWithAttributes: fontAttrDomain];
 418             maxWidthDomain = MAX( nextSize.width, maxWidthDomain );
 419             if( path.count > 1 ) needRoomForPopup = YES;
 420         }
 421
 422 #define EDGE_GAP    5
 423 #define POPUP_ARROW    22
 424
 425         if( !self.instanceServiceTypeColumn.hidden )
 426         {
 427             maxWidthType += (EDGE_GAP * 2);
 428             if( self.instanceServiceTypeColumn.width != maxWidthType )
 429             {
 430                 self.instanceServiceTypeColumn.width = self.instanceServiceTypeColumn.minWidth = self.instanceServiceTypeColumn.maxWidth = maxWidthType;
 431                 sizeChanged = YES;
 432             }
 433         }
 434
 435         if( !self.instancePathPopupColumn.hidden )
 436         {
 437             maxWidthDomain += (EDGE_GAP * 2) + needRoomForPopup ? POPUP_ARROW : 0;
 438             if( self.instancePathPopupColumn.width != maxWidthDomain )
 439             {
 440                 self.instancePathPopupColumn.width = self.instancePathPopupColumn.minWidth = self.instancePathPopupColumn.maxWidth = maxWidthDomain;
 441                 sizeChanged = YES;
 442             }
 443         }
 444
 445         if( sizeChanged )
 446         {
 447             [self.instancePathPopupColumn.tableView sizeToFit];
 448         }
 449     }
 450 }
 451
 452 #pragma mark - Dispatch
 453
 454 static void finalizer( void * context )
 455 {
 456     CNServiceBrowserView *self = (__bridge CNServiceBrowserView *)context;
 457 //    NSLog( @"finalizer: %@", self );
 458     (void)CFBridgingRelease( (__bridge void *)self );
 459 }
 460
 461 #pragma mark - Commands
 462
 463 - (void)doubleAction:(id)sender
 464 {
 465     if( _delegate && [_delegate respondsToSelector: @selector(doubleAction:)] &&
 466        sender == self.instanceTable )
 467     {
 468         NSTableView * table = (NSTableView *)sender;
 469         NSDictionary * record = nil;
 470         if( table.selectedRow >= 0 && table.selectedRow < (NSInteger)[self.instanceC.content count] ) record = (NSDictionary *)self.instanceC.content[table.selectedRow];
 471         [_delegate doubleAction: record[_CNInstanceKey_resolveUrl]];
 472     }
 473 }
 474
 475 - (void)newServiceBrowse:(NSArray *)domainPath
 476 {
 477         if( _serviceTypes.count)
 478         {
 479         self.instanceC.content = nil;
 480         [self browseForServiceTypes: _serviceTypes inDomainPath: domainPath];
 481         }
 482 }
 483
 484 - (void)browseForServiceTypes:(NSArray *)serviceTypes inDomainPath:(NSArray *)domainPath
 485 {
 486     if( serviceTypes.count /*&& domainPath.count*/ )
 487     {
 488         _serviceTypes = [serviceTypes copy];
 489         _currentDomainPath = [domainPath copy];
 490
 491         NSString * domainStr = DomainPathToDNSDomain( _currentDomainPath );
 492
 493         [_instanceRs removeAllObjects];
 494         if( !_instanceBrowseQ )
 495         {
 496             self.instanceBrowseQ = dispatch_queue_create( "DNSServiceBrowse", DISPATCH_QUEUE_PRIORITY_DEFAULT );
 497             dispatch_set_context( _instanceBrowseQ, (void *)CFBridgingRetain( self ) );
 498             dispatch_set_finalizer_f( _instanceBrowseQ, finalizer );
 499         }
 500
 501         dispatch_sync( _instanceBrowseQ, ^{
 502             [self->_instanceD removeAllObjects];
 503             [self->_instanceA removeAllObjects];
 504         });
 505
 506         DNSServiceErrorType error;
 507         DNSServiceRef mainRef;
 508         if( (error = DNSServiceCreateConnection( &mainRef )) != 0 )
 509             NSLog(@"DNSServiceCreateConnection failed error: %ld", error);
 510         else
 511         {
 512             for( NSString * nextService in _serviceTypes )
 513             {
 514                 DNSServiceRef ref = mainRef;
 515                 if( (error = DNSServiceBrowse( &ref, kDNSServiceFlagsShareConnection, 0, [nextService UTF8String], [domainStr UTF8String], browseReply, (__bridge void *)self )) != 0 )
 516                     NSLog(@"DNSServiceBrowse failed error: %ld", error);
 517                 else
 518                 {
 519                     [_instanceRs addObject: [[_DNSServiceRefWrapper alloc] initWithRef: ref]];
 520                 }
 521             }
 522             [_instanceRs addObject: [[_DNSServiceRefWrapper alloc] initWithRef: mainRef]];
 523             if( !error )
 524             {
 525                 error = DNSServiceSetDispatchQueue( mainRef, _instanceBrowseQ );
 526                 if( error ) NSLog( @"DNSServiceSetDispatchQueue error: %d", error );
 527             }
 528         }
 529     }
 530 }
 531
 532 - (void)resolveServiceInstance:(NSMutableDictionary *)record
 533 {
 534     __weak NSDictionary *   weakRecord = record;
 535     DNSServiceRef           ref;
 536     DNSServiceErrorType     error;
 537     NSString *              domainPath = DomainPathToDNSDomain( record[_CNInstanceKey_domainPath] );
 538
 539     if( (error = DNSServiceResolve( &ref, (DNSServiceFlags)0, kDNSServiceInterfaceIndexAny, [record[_CNInstanceKey_name] UTF8String], [record[_CNInstanceKey_serviceType] UTF8String], [domainPath UTF8String], resolveReply, (__bridge void *)weakRecord )) != 0 )
 540     {
 541         NSLog(@"DNSServiceResolve failed error: %ld", error);
 542     }
 543     else
 544     {
 545         record[_CNInstanceKey_resolveInstance] = [[_DNSServiceRefWrapper alloc] initWithRef: ref];
 546         error = DNSServiceSetDispatchQueue( ref, _instanceBrowseQ );
 547         if( error ) NSLog( @"resolve DNSServiceSetDispatchQueue error: %d", error );
 548     }
 549 }
 550
 551 #pragma mark - Static Callbacks
 552
 553 static void resolveReply( DNSServiceRef sdRef,
 554                   DNSServiceFlags flags,
 555                   uint32_t interfaceIndex,
 556                   DNSServiceErrorType errorCode,
 557                   const char *fullname,
 558                   const char *hosttarget,
 559                   uint16_t port,                                   /* In network byte order */
 560                   uint16_t txtLen,
 561                   const unsigned char *txtRecord,
 562                   void *context )
 563 {
 564     (void)sdRef;            //    Unused
 565     (void)flags;            //    Unused
 566     (void)interfaceIndex;   //    Unused
 567     (void)errorCode;        //    Unused
 568     (void)fullname;         //    Unused
 569     __weak NSMutableDictionary * record = (__bridge __weak NSMutableDictionary *)context;
 570     if( record && hosttarget )
 571     {
 572         NSURLComponents * urlComponents = [[NSURLComponents alloc] init];
 573         urlComponents.scheme = @"http";
 574         urlComponents.host = [NSString stringWithUTF8String: hosttarget];
 575         if( TXTRecordContainsKey( txtLen, txtRecord, "path" ) )
 576         {
 577             uint8_t         valueLen;
 578             const u_char *  valuePtr = TXTRecordGetValuePtr( txtLen, txtRecord, "path", &valueLen );
 579             urlComponents.path = (__bridge_transfer NSString *)CFStringCreateWithBytes( kCFAllocatorDefault, valuePtr, valueLen, kCFStringEncodingUTF8, false );
 580         }
 581         if( port ) urlComponents.port = [NSNumber numberWithUnsignedShort: ntohs( port )];
 582         record[_CNInstanceKey_resolveUrl] = urlComponents.URL;
 583     }
 584 }
 585
 586 static void browseReply( DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interfaceIndex, DNSServiceErrorType errorCode, const char *serviceName, const char *regtype, const char *replyDomain, void *context )
 587 {
 588     (void)sdRef;            //    Unused
 589     (void)interfaceIndex;   //    Unused
 590     (void)errorCode;        //    Unused
 591     CNServiceBrowserView *self = (__bridge CNServiceBrowserView *)context;
 592     char fullNameBuffer[kDNSServiceMaxDomainName];
 593     if( DNSServiceConstructFullName( fullNameBuffer, serviceName, regtype, replyDomain ) == kDNSServiceErr_NoError )
 594     {
 595         NSString *fullName = @(fullNameBuffer);
 596         NSString *name = [NSString stringWithUTF8String: serviceName];
 597         NSArray *pathArray = DNSDomainToDomainPath( [NSString stringWithUTF8String: replyDomain] );
 598
 599         if( flags & kDNSServiceFlagsAdd )
 600         {
 601             BOOL    okToAdd = YES;
 602             NSString * newServiceType = [[NSString stringWithUTF8String: regtype] stringByTrimmingCharactersInSet: [NSCharacterSet characterSetWithCharactersInString: @"."]];
 603             NSString * oldServiceType = [self.instanceD objectForKey: name][_CNInstanceKey_serviceType];
 604             if( oldServiceType && ![newServiceType isEqualToString: oldServiceType] )
 605             {
 606                 NSInteger newIndex = [self.serviceTypes indexOfObject: newServiceType];
 607                 NSInteger oldIndex = [self.serviceTypes indexOfObject: oldServiceType];
 608                 if( newIndex != NSNotFound && oldIndex != NSNotFound && oldIndex < newIndex ) okToAdd = NO;
 609             }
 610             if( okToAdd )
 611             {
 612                 NSMutableDictionary * record = [NSMutableDictionary dictionary];
 613                 record[_CNInstanceKey_fullName] = fullName;
 614                 record[_CNInstanceKey_name] = name;
 615                 record[_CNInstanceKey_serviceType] = newServiceType;
 616                 record[_CNInstanceKey_domainPath] = [[pathArray reverseObjectEnumerator] allObjects];
 617                 [self.instanceD setObject: record
 618                                    forKey: name];
 619                 [self resolveServiceInstance: record];
 620             }
 621         }
 622         else
 623         {
 624             NSString * newServiceType = [[NSString stringWithUTF8String: regtype] stringByTrimmingCharactersInSet: [NSCharacterSet characterSetWithCharactersInString: @"."]];
 625             NSDictionary * oldRecord = [self.instanceD objectForKey: name];
 626             if( [oldRecord[_CNInstanceKey_serviceType] isEqualToString: newServiceType] )
 627             {
 628                 [self.instanceD removeObjectForKey: name];
 629             }
 630         }
 631
 632         if( !(flags & kDNSServiceFlagsMoreComing) )
 633         {
 634             dispatch_async( dispatch_get_main_queue(), ^{
 635                 [self.instanceA setArray: [[self.instanceD allValues] sortedArrayUsingComparator: ^( id obj1, id obj2 ) {
 636                     return (NSComparisonResult)[obj1[_CNInstanceKey_name] compare: obj2[_CNInstanceKey_name] options: NSCaseInsensitiveSearch];
 637                 }]];
 638                 [self handleBrowseResults];
 639             });
 640         }
 641     }
 642 }
 643
 644 @end