src/NetworkFunctions.cpp

   1 //
   2 // This file is part of the aMule Project.
   3 //
   4 // Copyright (c) 2004-2011 Angel Vidal ( kry@amule.org )
   5 // Copyright (c) 2003-2011 aMule Team ( admin@amule.org / http://www.amule.org )
   6 // Copyright (c) 2002-2011 Merkur ( devs@emule-project.net / http://www.emule-project.net )
   7 //
   8 // Any parts of this program derived from the xMule, lMule or eMule project,
   9 // or contributed by third-party developers are copyrighted by their
  10 // respective authors.
  11 //
  12 // This program is free software; you can redistribute it and/or modify
  13 // it under the terms of the GNU General Public License as published by
  14 // the Free Software Foundation; either version 2 of the License, or
  15 // (at your option) any later version.
  16 //
  17 // This program is distributed in the hope that it will be useful,
  18 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 // GNU General Public License for more details.
  21 //
  22 // You should have received a copy of the GNU General Public License
  23 // along with this program; if not, write to the Free Software
  24 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  25 //
  26
  27 #include "NetworkFunctions.h"   // Interface declaration
  28 #include "amuleIPV4Address.h"
  29
  30 bool StringIPtoUint32(const wxString &strIP, uint32& Ip)
  31 {
  32         // The current position in the current field, used to detect malformed fields (x.y..z).
  33         unsigned digit = 0;
  34
  35         // The current field, used to ensure only IPs that looks like a.b.c.d are supported
  36         unsigned field = 0;
  37
  38         // The value of the current field
  39         unsigned value = 0;
  40
  41         // Stores the work-value of the IP, reference is not changed unless the str was valid
  42         uint32 tmp_ip = 0;
  43
  44         wxString str = strIP.Strip( wxString::both );
  45         for (size_t i = 0; i < str.Length(); i++) {
  46                 wxChar c = str.GetChar( i );
  47
  48                 if ( c >= wxT('0') && c <= wxT('9') && (value >> 8) == 0) {
  49                         value = ( value * 10 ) + ( c - wxT('0') );
  50                         ++digit;
  51                 } else if ( c == wxT('.') ) {
  52                         if ( digit && (value >> 8) == 0) {
  53                                 tmp_ip = tmp_ip | value << ( field * 8 );
  54
  55                                 // Rest the current field values
  56                                 value = digit = 0;
  57                                 ++field;
  58                         } else {
  59                                 return false;
  60                         }
  61                 } else {
  62                         return false;
  63                 }
  64         }
  65
  66         // Only set the referenced value if it was a valid IP
  67         if ( field == 3 && digit && (value >> 8) == 0) {
  68                 Ip = tmp_ip | value << 24;
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75
  76 uint32 StringHosttoUint32(const wxString &Host)
  77 {
  78         if (Host.IsEmpty()) {
  79                 return 0;
  80         }
  81         amuleIPV4Address solver;
  82         if (solver.Hostname(Host)) {
  83                 uint32 result = StringIPtoUint32(solver.IPAddress());
  84                 if (result != (uint32)-1) {     // should not happen
  85                         return result;
  86                 }
  87         }
  88         // This actually happens on wrong hostname
  89         return 0;
  90 }
  91
  92 /**
  93  * Used to store the ranges.
  94  */
  95 struct IPRange
  96 {
  97         const wxChar *addr;
  98         unsigned int mask;
  99         bool isLAN;
 100 };
 101
 102
 103 const IPRange ranges[] = {
 104 //      Here is reserved blocks from RFC 3330 at http://www.rfc-editor.org/rfc/rfc3330.txt
 105 //
 106 //Address Block                      Present Use                           Reference
 107 //----------------------------------------------------------------------------------
 108 { wxT("0.0.0.0"),        8, false }, // "This" Network             [RFC1700, page 4]
 109 { wxT("10.0.0.0"),       8, true  }, // Private-Use Networks               [RFC1918]
 110 // Acording to RFC3330, 24.* and 14.* must be parsed as normal ips.
 111 //{ wxT("14.0.0.0"),       8, false }, // Public-Data Networks     [RFC1700, page 181]
 112 //{ wxT("24.0.0.0"),       8, false }, // Cable Television Networks                 --
 113 { wxT("39.0.0.0"),       8, false }, // Reserved but subject
 114                                      //    to allocation                   [RFC1797]
 115 { wxT("127.0.0.0"),      8, false }, // Loopback                   [RFC1700, page 5]
 116 { wxT("128.0.0.0"),     16, false }, // Reserved but subject
 117                                      //    to allocation                          --
 118 { wxT("169.254.0.0"),   16, false }, // Link Local                                --
 119 { wxT("172.16.0.0"),    12, true  }, // Private-Use Networks               [RFC1918]
 120 { wxT("191.255.0.0"),   16, false }, // Reserved but subject
 121                                      //    to allocation                          --
 122 { wxT("192.0.0.0"),     24, false }, // Reserved but subject
 123                                      //    to allocation                          --
 124 { wxT("192.0.2.0"),     24, false }, // Test-Net
 125 { wxT("192.88.99.0"),   24, false }, // 6to4 Relay Anycast                 [RFC3068]
 126 { wxT("192.168.0.0"),   16, true  }, // Private-Use Networks               [RFC1918]
 127 { wxT("198.18.0.0"),    15, false }, // Network Interconnect
 128                                      //    Device Benchmark Testing        [RFC2544]
 129 { wxT("223.255.255.0"), 24, false }, // Reserved but subject
 130                                      //    to allocation                          --
 131 { wxT("224.0.0.0"),      4, false }, // Multicast                          [RFC3171]
 132 { wxT("240.0.0.0"),      4, false }  // Reserved for Future Use    [RFC1700, page 4]
 133 };
 134
 135
 136 struct filter_st {
 137         uint32 addr;            // Address and mask in anti-host order.
 138         uint32 mask;
 139 };
 140
 141 const unsigned int number_of_ranges = sizeof(ranges) / sizeof(IPRange);
 142 static filter_st filters[number_of_ranges];
 143
 144
 145 // This function is used to initialize the IP filter
 146 bool SetupFilter()
 147 {
 148         for (unsigned int i = 0; i < number_of_ranges; ++i) {
 149                 filters[i].addr = StringIPtoUint32( ranges[i].addr );
 150                 filters[i].mask = ~wxUINT32_SWAP_ALWAYS((1 << (32 - ranges[i].mask)) - 1);
 151         }
 152         return true;
 153 }
 154
 155
 156 // This is a little trick to ensure that the filter-list is initialized before
 157 // it gets used, while not risking threading problems.
 158 static bool filterSetup = SetupFilter();
 159
 160
 161 bool IsGoodIP(uint32 IP, bool filterLAN)
 162 {
 163         for (unsigned int i = 0; i < number_of_ranges; ++i) {
 164                 if (((IP ^ filters[i].addr) & filters[i].mask) == 0) {
 165                         if ( filterLAN || !ranges[i].isLAN ) {
 166                                 return false;
 167                         }
 168                 }
 169         }
 170
 171         return true;
 172 }
 173
 174 bool IsLanIP(uint32_t ip) throw()
 175 {
 176         for (unsigned int i = 0; i < number_of_ranges; i++) {
 177                 if (((ip ^ filters[i].addr) & filters[i].mask) == 0) {
 178                         return ranges[i].isLAN;
 179                 }
 180         }
 181         return false;
 182 }
 183 // File_checked_for_headers