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HELP: DNS

Posted on 2000-05-09
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Last Modified: 2010-04-04
Hi all!

I'm using D5 with the Windshoes WinshoeMappedPort. It works like a dream :-)

Q: For each connection made through the WinshoeMappedPort a thread is running. In each of these threads I want to make a DNS lookup (converting a name to ip).

So basicly I need some code that I can put inside the code of each thread (I don't with to use synchronized code, due to performance reasons).

If several DNS servers is available, I guess it would be smart to have multiple thread querying each of them. Please comment this issue.

Please note the DNS address can be either on a LAN or modem connection.

Source code would be very appreciated, something like
DNSQuery(ComputerName : String) : TStrings;
begin
  ?
end;

I know FPiette has an example using ICS, so don't give me that solution! If I can avoid it, I would try to stick to WinShoes.

Best regards,

Peter
0
Comment
Question by:jpvj
  • 2
3 Comments
 
LVL 7

Accepted Solution

by:
God_Ares earned 100 total points
ID: 2791916
uses WinSock;

function GetHostName(name : string) : string;
var
wsdata : TWSAData;
  he : PHostEnt;
  ip : TInAddr;            
begin
  WSAStartup(MakeWord(1, 1), wsdata);
  ip.S_addr := inet_addr(PChar(name));
  he := gethostbyaddr(@ip.S_un_b, 4, AF_INET);        
  if he<>nil then
    Result := string(he.h_name)
  else
    Result := IntToStr(WSAGetLastError);
  WSACleanup();
end;

function GetIPAddress(name : string) : string;
var wsdata : TWSAData;
    he : PHostEnt;
    ss : pchar;
    ip : TInAddr;
begin
  WSAStartup(MakeWord(1, 1), wsdata);
  he := gethostbyname(pchar(name));
  if he<>nil then
  begin
    ip.S_addr := integer(pointer(he^. h_addr_list^)^);
    ss := inet_ntoa(ip);
    Result := string(ss);
  end;
  WSACleanup();
end;
0
 

Author Comment

by:jpvj
ID: 2793741
Thanks a lot!

Peter
0
 
LVL 7

Expert Comment

by:God_Ares
ID: 2795697
yeah shure no probl.. thanx for tha points...

yet again closer to my t-shirt :)
0

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