SSL Server Example

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit.

Download Chilkat Socket ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATCERTIFICATELib_TLB,
    CHILKATSOCKETLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
listenSslSocket: TChilkatSocket;
success: Integer;
certStore: CHILKATCERTIFICATELib_TLB.IChilkatCertStore;
cert: CHILKATSOCKETLib_TLB.IChilkatCert;
myPort: Integer;
backLog: Integer;
clientSock: IChilkatSocket;
maxWaitMillisec: Integer;
receivedMsg: String;

begin
listenSslSocket := TChilkatSocket.Create(Self);

//  Any string automatically begins a fully-functional 30-day trial.

success := listenSslSocket.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage('Failed to unlock component');
    Exit;
  end;

//  An SSL server needs a digital certificate.  This example loads it from a PFX file.

//  Create an instance of a certificate store object, load a PFX file,
//  locate the certificate we need, and use it.
//  (a PFX file may contain more than one certificate.)
certStore := CoChilkatCertStore.Create();
//  The 1st argument is the filename, the 2nd arg is the
//  PFX file's password:
success := certStore.LoadPfxFile('chilkat.pfx','test');
if (success <> 1) then
  begin
    ShowMessage(certStore.LastErrorText);
    Exit;
  end;

//  Find the certificate to be used for SSL:

cert := certStore.FindCertBySubject('Chilkat Software, Inc.') As CHILKATSOCKETLib_TLB.IChilkatCert;
if (cert = nil ) then
  begin
    ShowMessage(certStore.LastErrorText);
    Exit;
  end;

//  Use the certificate:
success := listenSslSocket.InitSslServer(cert As CHILKATSOCKETLib_TLB.IChilkatCert);
if (success <> 1) then
  begin
    ShowMessage(listenSslSocket.LastErrorText);
    Exit;
  end;

//  Bind and listen on a port:
myPort := 8123;
//  Allow for a max of 5 queued connect requests.
backLog := 5;
success := listenSslSocket.BindAndListen(myPort,backLog);
if (success <> 1) then
  begin
    ShowMessage(listenSslSocket.LastErrorText);
    Exit;
  end;

//  If accepting an SSL/TLS connection, the SSL handshake is part of the connection
//  establishment process. This involves a few back-and-forth messages between the
//  client and server to establish algorithms and a shared key to create the secure
//  channel. The sending and receiving of these messages are governed by the
//  MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0
//  (and this is the default unless changed by your application), then the
//  AcceptNextConnection can hang indefinitely during the SSL handshake process.
//  Make sure these properties are set to appropriate values before calling AcceptNextConnection.

//  Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.MaxReadIdleMs := 10000;
listenSslSocket.MaxSendIdleMs := 10000;

//  Accept a single client connection and establish the secure SSL/TLS channel:

maxWaitMillisec := 20000;
clientSock := listenSslSocket.AcceptNextConnection(maxWaitMillisec);
if (clientSock = nil ) then
  begin
    ShowMessage(listenSslSocket.LastErrorText);
    Exit;
  end;

//  The client (in this example) is going to send a "Hello Server! -EOM-"
//  message.  Read it:

receivedMsg := clientSock.ReceiveUntilMatch('-EOM-');
if (Length(receivedMsg) = 0 ) then
  begin
    ShowMessage(clientSock.LastErrorText);
    Exit;
  end;

ShowMessage(receivedMsg);

//  Send a "Hello Client! -EOM-" message:
success := clientSock.SendString('Hello Client! -EOM-');
if (success <> 1) then
  begin
    ShowMessage(clientSock.LastErrorText);
    Exit;
  end;

//  Close the connection with the client
//  Wait a max of 20 seconds (20000 millsec)
clientSock.Close(20000);
end;