mDNSMacOSX/DomainBrowser/Shared/CNDomainBrowserPathUtils.m

   1 /*
   2  *
   3  * Copyright (c) 2016 Apple Inc. All rights reserved.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #import "CNDomainBrowserPathUtils.h"
  19 #import <CFNetwork/CFHostPriv.h>
  20 #include "../../../Clients/ClientCommon.h"
  21
  22 static const char *EscapeLabel(const char *cstr, char label[64])
  23 {
  24     //  Based on code on clownfish from: DNSName::GetEscapedDNSName
  25     char *ptr = label;
  26     while (*cstr)                                                                                               // While we have characters in the label...
  27     {
  28         char c = *cstr++;
  29         if (c == '\\' || c == '.')                                                              //      escape '\' and '.'
  30         {
  31             if (ptr >= label+64-2) return(NULL);
  32             *ptr++ = '\\';
  33             *ptr++ = c;
  34         }
  35         else if (c <= ' ')                                                                              //      escape ' ' and lower
  36         {
  37             if (ptr >= label+64-4) return(NULL);
  38             *ptr++ = '\\';
  39             *ptr++ = '0' + (c / 100);
  40             *ptr++ = '0' + ((c / 10) % 10);
  41             *ptr++ = '0' + (c % 10);
  42         }
  43         else
  44         {
  45             if (ptr >= label+64-1) return(NULL);
  46             *ptr++ = c;
  47         }
  48     }
  49     *ptr = 0;
  50     return(label);
  51 }
  52
  53 NSString * DomainPathToDNSDomain(NSArray * domainPath)
  54 {
  55     NSMutableString * dnsStr = [NSMutableString string];
  56
  57     char label[64];
  58     for (NSString * next in domainPath)
  59     {
  60         NSString * nextLabel;
  61         if (dnsStr.length) nextLabel = [NSString stringWithUTF8String: EscapeLabel([next UTF8String], label)];
  62         else               nextLabel = next;
  63         [dnsStr insertString: [NSString stringWithFormat: @"%@.", nextLabel] atIndex: 0];
  64     }
  65
  66     return(dnsStr);
  67 }
  68
  69 NSArray *  DNSDomainToDomainPath(NSString * domain)
  70 {
  71     int labels = 0, depth = 0;
  72     char text[64];
  73     const char * domainStr = domain.UTF8String;
  74     const char *label[128];
  75     NSString *  undottedStr;
  76     NSMutableArray *a = [NSMutableArray array];
  77
  78     while (*domainStr)
  79     {
  80         label[labels] = domainStr;
  81         domainStr = GetNextLabel(domainStr, text);
  82
  83         undottedStr = [[NSString stringWithUTF8String: label[labels]]
  84                        stringByTrimmingCharactersInSet: [NSCharacterSet punctuationCharacterSet]];
  85         if (!*domainStr || _CFHostIsDomainTopLevel((__bridge CFStringRef)undottedStr))
  86         {
  87             if (labels)
  88             {
  89                 labels--;                                                                       //      If not first level then back up one level
  90                 undottedStr = [[NSString stringWithUTF8String: label[labels]]
  91                                stringByTrimmingCharactersInSet: [NSCharacterSet punctuationCharacterSet]];
  92             }
  93             [a addObject: undottedStr];
  94             break;
  95         }
  96         labels++;
  97     }
  98
  99     // Process the remainder of the hierarchy
 100     for (depth = 0 ; depth < labels ; depth++)
 101     {
 102         GetNextLabel(label[labels-1-depth], text);
 103         [a addObject: [NSString stringWithUTF8String: text]];
 104     }
 105
 106     return(a);
 107 }
 108
 109 NSString * TrimCharactersFromDNSDomain(NSString * domain)
 110 {
 111     NSMutableCharacterSet * trimSet = [NSMutableCharacterSet whitespaceCharacterSet];
 112     [trimSet formUnionWithCharacterSet:[NSCharacterSet punctuationCharacterSet]];
 113     return([domain stringByTrimmingCharactersInSet:trimSet]);
 114 }