106 lines
2.5 KiB
Plaintext
106 lines
2.5 KiB
Plaintext
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{
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$Project$
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$Workfile$
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$Revision$
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$DateUTC$
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$Id$
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This file is part of the Indy (Internet Direct) project, and is offered
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under the dual-licensing agreement described on the Indy website.
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(http://www.indyproject.org/)
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Copyright:
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(c) 1993-2005, Chad Z. Hower and the Indy Pit Crew. All rights reserved.
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}
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{
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$Log$
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}
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unit IdTraceRoute;
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interface
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{$i IdCompilerDefines.inc}
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uses
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IdIcmpClient, IdRawBase, IdRawClient, IdThread;
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type
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TIdTraceRoute = class(TIdCustomICMPClient)
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protected
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FResolveHostNames : Boolean;
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procedure DoReply; override;
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public
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procedure Trace;
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published
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{$IFDEF DOTNET_2_OR_ABOVE}
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property IPVersion;
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{$ENDIF}
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property PacketSize;
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property ReceiveTimeout;
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property ResolveHostNames : Boolean read FResolveHostNames write FResolveHostNames;
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property OnReply;
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end;
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implementation
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uses
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IdGlobal, IdStack;
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{ TIdTraceRoute }
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procedure TIdTraceRoute.DoReply;
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begin
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if FResolveHostNames and
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(PosInStrArray(FReplyStatus.FromIpAddress, ['0.0.0.0', '::0']) = -1) then {do not localize}
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begin
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//resolve IP to hostname
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try
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FReplyStatus.HostName := GStack.HostByAddress(FReplyStatus.FromIpAddress, FBinding.IPVersion);
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except
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{
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We do things this way because we are likely have a reverse DNS
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failure if you have a computer with IP address and no DNS name at all.
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}
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FReplyStatus.HostName := FReplyStatus.FromIpAddress;
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end;
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end;
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inherited DoReply;
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end;
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procedure TIdTraceRoute.Trace;
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//In traceroute, there are a maximum of thirty echo request packets. You start
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//requests with a TTL of one and keep sending them until you get to thirty or you
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//get an echo response (whatever comes sooner).
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var
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i : Integer;
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lSeq : UInt32;
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LTTL : Integer;
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LIPAddr : String;
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begin
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// PacketSize := 64;
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//We do things this way because we only want to resolve the destination host name
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//only one time. Otherwise, there's a performance penalty for earch DNS resolve.
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LIPAddr := GStack.ResolveHost(FHost, FBinding.IPVersion);
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LSeq := $1;
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LTTL := 1;
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TTL := LTTL;
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for i := 1 to 30 do
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begin
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ReplyStatus.PacketNumber := i;
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InternalPing(LIPAddr, '', LSeq);
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case ReplyStatus.ReplyStatusType of
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rsErrorTTLExceeded,
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rsTimeout : ;
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else
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Break;
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end;
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Inc(LTTL);
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TTL := LTTL;
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LSeq := LSeq * 2;
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end;
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end;
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end.
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