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TCP/IP Protocol
[edit] Webserver example
Bellow there is an example http server written with Synapse and tested in Mac OS X, after changing the synapse source to use a fixed constant $20000 as MSG_NOSIGNAL, because this constant isn't present in the sockets unit in Mac OS X.
{
The Micro Pascal WebServer
This is a very simple example webserver implemented with the Synapse library.
It works with blocking sockets and a single thread, so it
can only handle one request at a given time.
It will write the headers that it receives from the browser
to the standard output.
It serves a fixed webpage for the / URI
For any other URI it will return 504 not found
}
program upserver;
{$ifdef fpc}
{$mode delphi}
{$endif}
{$apptype console}
uses
Classes, blcksock, sockets, Synautil, SysUtils;
{@@
Attends a connection. Reads the headers and gives an
appropriate response
}
procedure AttendConnection(ASocket: TTCPBlockSocket);
var
timeout: integer;
s: string;
method, uri, protocol: string;
OutputDataString: string;
ResultCode: integer;
begin
timeout := 120000;
WriteLn('Received headers+document from browser:');
//read request line
s := ASocket.RecvString(timeout);
WriteLn(s);
method := fetch(s, ' ');
uri := fetch(s, ' ');
protocol := fetch(s, ' ');
//read request headers
repeat
s := ASocket.RecvString(Timeout);
WriteLn(s);
until s = '';
// Now write the document to the output stream
if uri = '/' then
begin
// Write the output document to the stream
OutputDataString :=
'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'
+ ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">' + CRLF
+ '<html><h1>Teste</h1></html>' + CRLF;
// Write the headers back to the client
ASocket.SendString('HTTP/1.0 200' + CRLF);
ASocket.SendString('Content-type: Text/Html' + CRLF);
ASocket.SendString('Content-length: ' + IntTostr(Length(OutputDataString)) + CRLF);
ASocket.SendString('Connection: close' + CRLF);
ASocket.SendString('Date: ' + Rfc822DateTime(now) + CRLF);
ASocket.SendString('Server: Servidor do Felipe usando Synapse' + CRLF);
ASocket.SendString('' + CRLF);
// if ASocket.lasterror <> 0 then HandleError;
// Write the document back to the browser
ASocket.SendString(OutputDataString);
end
else
ASocket.SendString('HTTP/1.0 504' + CRLF);
end;
var
ListenerSocket, ConnectionSocket: TTCPBlockSocket;
begin
ListenerSocket := TTCPBlockSocket.Create;
ConnectionSocket := TTCPBlockSocket.Create;
ListenerSocket.CreateSocket;
ListenerSocket.setLinger(true,10);
ListenerSocket.bind('0.0.0.0','1500');
ListenerSocket.listen;
repeat
if ListenerSocket.canread(1000) then
begin
ConnectionSocket.Socket := ListenerSocket.accept;
WriteLn('Attending Connection. Error code (0=Success): ', ConnectionSocket.lasterror);
AttendConnection(ConnectionSocket);
end;
until false;
ListenerSocket.Free;
ConnectionSocket.Free;
end. |
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|手机版|小黑屋|Lazarus中国|Lazarus中文社区
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发表于 2009-2-16 10:53:47
发表于 2009-6-20 22:44:26
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