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resolver.pas
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resolver.pas
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{
* Copyright (c) 2012, Tristan Linnell <tris@canthack.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
}
// hgdc-x Cross Platform hgd client written in Lazarus/Freepascal
// resolver.pas - Patch to FPC's name resolution under Unix. Uses libc calls.
unit Resolver;
{$mode objfpc}{$H+}
interface
uses
initc, Classes, SysUtils, Sockets;
type
THostEnt = record
H_Name : pchar; { Official name }
H_Aliases : ppchar; { Null-terminated list of aliases}
H_Addrtype : longint; { Host address type }
H_length : longint; { Length of address }
H_Addr : ppchar; { null-terminated list of adresses }
end;
PHostEntry = ^THostEnt;
THostAddr = in_addr;
PHostAddr = ^THostAddr;
// From libc
function gethostbyname(Name: Pchar): PHostEntry; cdecl; external clib;
function NameLookup(Name: string; out IP: string): boolean;
implementation
function NameLookup(Name: string; out IP: string): boolean;
var
PHost : PHostEntry;
Addr: THostAddr;
begin
IP := Name;
PHost := GetHostByName(PChar(Name));
If PHost <> nil then
begin
Addr := NetToHost(PHostAddr(PHost^.H_Addr[0])^);
IP := HostAddrToStr(Addr);
Result := True;
end;
end;
end.