mcs/class/System/System.Net/EndpointPermission.cs

   1 //\r
   2 // System.Net.EndpointPermission.cs\r
   3 //\r
   4 // Author:\r
   5 //   Lawrence Pit (loz@cable.a2000.nl)\r
   6 //\r
   7 \r
   8 //\r
   9 // Permission is hereby granted, free of charge, to any person obtaining\r
  10 // a copy of this software and associated documentation files (the\r
  11 // "Software"), to deal in the Software without restriction, including\r
  12 // without limitation the rights to use, copy, modify, merge, publish,\r
  13 // distribute, sublicense, and/or sell copies of the Software, and to\r
  14 // permit persons to whom the Software is furnished to do so, subject to\r
  15 // the following conditions:\r
  16 // \r
  17 // The above copyright notice and this permission notice shall be\r
  18 // included in all copies or substantial portions of the Software.\r
  19 // \r
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,\r
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\r
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\r
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\r
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\r
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\r
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
  27 //\r
  28 \r
  29 using System;\r
  30 using System.Collections;\r
  31 using System.Security;\r
  32 using System.Security.Permissions;\r
  33 \r
  34 namespace System.Net\r
  35 {\r
  36         [Serializable]\r
  37         public class EndpointPermission // too bad about the lowercase p, not consistent with IPEndPoint ;)\r
  38         {\r
  39                 private static char [] dot_char = new char [] { '.' };\r
  40                 \r
  41                 // Fields\r
  42                 private string hostname;\r
  43                 private int port;\r
  44                 private TransportType transport;\r
  45 \r
  46                 private bool resolved;          \r
  47                 private bool hasWildcard;\r
  48                 private IPAddress [] addresses;\r
  49                 \r
  50                 // Constructors\r
  51                 internal EndpointPermission (string hostname, \r
  52                                              int port, \r
  53                                              TransportType transport) : base () \r
  54                 {                       \r
  55                         if (hostname == null)\r
  56                                 throw new ArgumentNullException ("hostname");\r
  57                         this.hostname = hostname;\r
  58                         this.port = port;\r
  59                         this.transport = transport;\r
  60                         this.resolved = false;\r
  61                         this.hasWildcard = false;\r
  62                         this.addresses = null;\r
  63                 }               \r
  64                 \r
  65                 // Properties\r
  66 \r
  67                 public string Hostname {\r
  68                         get { return hostname; }\r
  69                 }\r
  70 \r
  71                 public int Port {\r
  72                         get { return port; }\r
  73                 }\r
  74                 \r
  75                 public TransportType Transport {\r
  76                         get { return transport; }\r
  77                 }\r
  78                 \r
  79                 // Methods\r
  80                 \r
  81                 public override bool Equals (object obj) \r
  82                 {\r
  83                         EndpointPermission epp = obj as EndpointPermission;\r
  84                         return ((epp != null) &&\r
  85                                 (this.port == epp.port) &&\r
  86                                 (this.transport == epp.transport) &&\r
  87                                 (String.Compare (this.hostname, epp.hostname, true) == 0));\r
  88                 }\r
  89                 \r
  90                 public override int GetHashCode () \r
  91                 {\r
  92                         return ToString ().GetHashCode ();\r
  93                 }\r
  94                 \r
  95                 public override string ToString () \r
  96                 {\r
  97                         return hostname + "#" + port + "#" + (int) transport;\r
  98                 }\r
  99                 \r
 100                 // Internal & Private Methods\r
 101                 \r
 102                 internal bool IsSubsetOf (EndpointPermission perm) \r
 103                 {\r
 104                         if (perm == null)\r
 105                                 return false;\r
 106                         \r
 107                         if (perm.port != SocketPermission.AllPorts &&\r
 108                             this.port != perm.port)\r
 109                                 return false;\r
 110                         \r
 111                         if (perm.transport != TransportType.All &&\r
 112                             this.transport != perm.transport)\r
 113                                 return false;\r
 114                         \r
 115                         this.Resolve ();\r
 116                         perm.Resolve ();\r
 117                         \r
 118                         if (this.hasWildcard) {\r
 119                                 if (perm.hasWildcard)\r
 120                                         return IsSubsetOf (this.hostname, perm.hostname);\r
 121                                 else \r
 122                                         return false;\r
 123                         } \r
 124                         \r
 125                         if (this.addresses == null) \r
 126                                 return false;\r
 127                         \r
 128                         if (perm.hasWildcard) \r
 129                                 // a bit dubious... should they all be a subset or is one \r
 130                                 // enough in this case?\r
 131                                 foreach (IPAddress addr in this.addresses)\r
 132                                         if (IsSubsetOf (addr.ToString (), perm.hostname))\r
 133                                                 return true;\r
 134                                 \r
 135                         if (perm.addresses == null) \r
 136                                 return false;\r
 137                                 \r
 138                         // a bit dubious... should they all be a subset or is one \r
 139                         // enough in this case?\r
 140                         foreach (IPAddress addr in perm.addresses)\r
 141                                 if (IsSubsetOf (this.hostname, addr.ToString ())) \r
 142                                         return true;    \r
 143                                         \r
 144                         return false;           \r
 145                 }               \r
 146                 \r
 147                 private bool IsSubsetOf (string addr1, string addr2)\r
 148                 {\r
 149                         string [] h1 = addr1.Split (dot_char);          \r
 150                         string [] h2 = addr2.Split (dot_char);\r
 151                                 \r
 152                         for (int i = 0; i < 4; i++) {\r
 153                                 int part1 = ToNumber (h1 [i]);\r
 154                                 if (part1 == -1) \r
 155                                         return false;                           \r
 156 \r
 157                                 int part2 = ToNumber (h2 [i]);\r
 158                                 if (part2 == -1)\r
 159                                         return false;                           \r
 160                                 if (part1 == 256)\r
 161                                         continue;\r
 162                                 if (part1 != part2 && part2 != 256)\r
 163                                         return false;\r
 164                         }\r
 165                         return true;\r
 166                 }\r
 167                 \r
 168                 internal EndpointPermission Intersect (EndpointPermission perm) \r
 169                 {\r
 170                         if (perm == null)\r
 171                                 return null;\r
 172                         \r
 173                         int _port;\r
 174                         if (this.port == perm.port)\r
 175                                 _port = this.port;\r
 176                         else if (this.port == SocketPermission.AllPorts)\r
 177                                 _port = perm.port;\r
 178                         else if (perm.port == SocketPermission.AllPorts)\r
 179                                 _port = this.port;\r
 180                         else\r
 181                                 return null;\r
 182 \r
 183                         TransportType _transport;\r
 184                         if (this.transport == perm.transport)\r
 185                                 _transport = this.transport;\r
 186                         else if (this.transport == TransportType.All)\r
 187                                 _transport = perm.transport;\r
 188                         else if (perm.transport == TransportType.All)\r
 189                                 _transport = this.transport;\r
 190                         else\r
 191                                 return null;\r
 192 \r
 193                         string _hostname = IntersectHostname (perm);                                            \r
 194                         \r
 195                         if (_hostname == null)\r
 196                                 return null;\r
 197 \r
 198                         if (!this.hasWildcard)\r
 199                                 return this;\r
 200                                 \r
 201                         if (!perm.hasWildcard)\r
 202                                 return perm;\r
 203                                 \r
 204                         EndpointPermission newperm = new EndpointPermission (_hostname, _port, _transport);\r
 205                         newperm.hasWildcard = true;\r
 206                         newperm.resolved = true;\r
 207                         return newperm;\r
 208                 }\r
 209                 \r
 210                 private string IntersectHostname (EndpointPermission perm)\r
 211                 {\r
 212                         if (this.hostname == perm.hostname)\r
 213                                 return this.hostname;\r
 214                                 \r
 215                         this.Resolve ();\r
 216                         perm.Resolve ();\r
 217                         \r
 218                         string _hostname = null;\r
 219                         \r
 220                         if (this.hasWildcard) {\r
 221                                 if (perm.hasWildcard) {\r
 222                                         _hostname = Intersect (this.hostname, perm.hostname);\r
 223                                 } else if (perm.addresses != null) {\r
 224                                         for (int j = 0; j < perm.addresses.Length; j++) {\r
 225                                                 _hostname = Intersect (this.hostname, perm.addresses [j].ToString ());\r
 226                                                 if (_hostname != null) \r
 227                                                         break;\r
 228                                         }\r
 229                                 }\r
 230                         } else if (this.addresses != null) {\r
 231                                 for (int i = 0; i < this.addresses.Length; i++) {\r
 232                                         string thisaddr = this.addresses [i].ToString ();\r
 233                                         if (perm.hasWildcard) {\r
 234                                                 _hostname = Intersect (thisaddr, perm.hostname);\r
 235                                         } else if (perm.addresses != null) {\r
 236                                                 for (int j = 0; j < perm.addresses.Length; j++) {\r
 237                                                         _hostname = Intersect (thisaddr, perm.addresses [j].ToString ());\r
 238                                                         if (_hostname != null) \r
 239                                                                 break;\r
 240                                                 }\r
 241                                         }\r
 242                                 }\r
 243                         }\r
 244                         \r
 245                         return _hostname;\r
 246                 }\r
 247                 \r
 248                 // alas, currently we'll only support IPv4 as that's MS.Net behaviour\r
 249                 // returns null when both host strings do not intersect\r
 250                 private string Intersect (string addr1, string addr2)\r
 251                 {\r
 252                         string [] h1 = addr1.Split (dot_char);          \r
 253                         string [] h2 = addr2.Split (dot_char);\r
 254                                 \r
 255                         string [] s = new string [7];\r
 256                         for (int i = 0; i < 4; i++) {\r
 257                                 int part1 = ToNumber (h1 [i]);\r
 258                                 if (part1 == -1) \r
 259                                         return null;                            \r
 260 \r
 261                                 int part2 = ToNumber (h2 [i]);\r
 262                                 if (part2 == -1)\r
 263                                         return null;                            \r
 264 \r
 265                                 if (part1 == 256) \r
 266                                         s [i << 1] = (part2 == 256) ? "*" : String.Empty + part2;\r
 267                                 else if (part2 == 256)\r
 268                                         s [i << 1] = (part1 == 256) ? "*" : String.Empty + part1;                               \r
 269                                 else if (part1 == part2)\r
 270                                         s [i << 1] = String.Empty + part1;\r
 271                                 else\r
 272                                         return null;\r
 273                         }\r
 274                         \r
 275                         s [1] = s [3] = s [5] = ".";\r
 276                         return String.Concat (s);\r
 277                 }\r
 278                 \r
 279                 // returns 256 if value is a '*' character\r
 280                 // returns -1 if value isn't a number between 0 and 255         \r
 281                 private int ToNumber (string value)\r
 282                 {\r
 283                         if (value == "*")\r
 284                                 return 256;\r
 285                                 \r
 286                         int len = value.Length;\r
 287                         if (len < 1 || len > 3)\r
 288                                 return -1;\r
 289                                 \r
 290                         int val = 0;                            \r
 291                         for (int i = 0; i < len; i++) {\r
 292                                 char c = value [i];\r
 293                                 if ('0' <= c && c <= '9') \r
 294                                         val = checked (val * 10 + (c - '0'));\r
 295                                 else\r
 296                                         return -1;\r
 297                         }\r
 298                         \r
 299                         return val <= 255 ? val : -1;\r
 300                 }\r
 301 \r
 302                 internal void Resolve ()\r
 303                 {\r
 304                         if (resolved)   \r
 305                                 return;\r
 306                                 \r
 307                         bool isHostname = false;                                \r
 308                         bool hasWildcard = false;\r
 309                         this.addresses = null;\r
 310                         \r
 311                         string [] s = hostname.Split (dot_char);\r
 312 \r
 313                         if (s.Length != 4) {\r
 314                                 isHostname = true;\r
 315                         } else {\r
 316                                 for (int i = 0; i < 4; i++) {\r
 317                                         int quad = ToNumber (s [i]);\r
 318                                         if (quad == -1) {\r
 319                                                 isHostname = true;\r
 320                                                 break;\r
 321                                         }\r
 322                                         if (quad == 256)\r
 323                                                 hasWildcard = true;\r
 324                                 }\r
 325                         }\r
 326                         \r
 327                         if (isHostname) {\r
 328                                 this.hasWildcard = false;\r
 329                                 try {\r
 330                                         this.addresses = Dns.GetHostAddresses (hostname);\r
 331                                 } catch (System.Net.Sockets.SocketException) {                                  \r
 332                                 }\r
 333                         } else {\r
 334                                 this.hasWildcard = hasWildcard;\r
 335                                 if (!hasWildcard) {\r
 336                                         addresses = new IPAddress [1];\r
 337                                         addresses [0] = IPAddress.Parse (hostname);\r
 338                                 }\r
 339                         }\r
 340                         \r
 341                         this.resolved = true;                           \r
 342                 }\r
 343                 \r
 344                 internal void UndoResolve ()\r
 345                 {\r
 346                         resolved = false;\r
 347                 }\r
 348         }\r
 349 }\r