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(PHP ActiveX) TCP or TLS over Multiple Hop SSH to Remote ServerDemonstrates how to use the Chilkat Socket API to connect to a remote server (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this: Application => ServerSSH1 => ServerSSH2 => DestinationServer The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.
<?php // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Ssh') $ssh1 = new COM("Chilkat.Ssh"); // Connect directly to the 1st SSH server. $success = $ssh1->Connect('serverssh1.com',22); if ($success != 1) { print $ssh1->LastErrorText . "\n"; exit; } // Authenticate using login/password: $success = $ssh1->AuthenticatePw('ssh1Login','ssh1Password'); if ($success != 1) { print $ssh1->LastErrorText . "\n"; exit; } // Connect through the 1st SSH connection to reach a 2nd SSH server. // Note: Any number of SSH connections may be simultaneously tunneled through a single // existing SSH connection. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Ssh') $ssh2 = new COM("Chilkat.Ssh"); $success = $ssh2->ConnectThroughSsh($ssh1,'serverssh2.com',22); if ($success != 1) { print $ssh2->LastErrorText . "\n"; exit; } // Authenticate with ssh2... $success = $ssh2->AuthenticatePw('ssh2Login','ssh2Password'); if ($success != 1) { print $ssh2->LastErrorText . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Socket') $socket = new COM("Chilkat.Socket"); // Tell the socket object to connect to our destination server though the ssh2 tunnel (which itself is routed through ssh1). // The connection looks like this: ApplicationSocket(TLS) => ServerSSH1 => ServerSSH2 => DestinationServer $success = $socket->UseSsh($ssh2); if ($success != 1) { print $socket->LastErrorText . "\n"; exit; } // Connect using TLS to www.chilkatsoft.com // We could also tunnel a bare TCP connection by specifying port 80 with useTls = 0. $useTls = 1; $maxWaitMillisec = 20000; $success = $socket->Connect('www.chilkatsoft.com',443,$useTls,$maxWaitMillisec); if ($success != 1) { print $socket->LastErrorText . "\n"; exit; } // Once the multiple hop SSH tunneled connection is setup, the socket programming // is identical to the normal case where we have a direct connection. // Tell the socket object that all text is to be sent in the utf-8 encoding, // and the text received is assumed to be utf-8. $socket->StringCharset = 'utf-8'; // Send an HTTP HEAD request: $success = $socket->SendString('HEAD / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n'); if ($success != 1) { print $socket->LastErrorText . "\n"; exit; } // Wait a maximum of 4 seconds while no data is forthcoming: $socket->MaxReadIdleMs = 4000; // Get the 1st response line, which should be "HTTP/1.1 200 OK" $responseStatusLine = $socket->receiveToCRLF(); if ($socket->LastMethodSuccess != 1) { print $socket->LastErrorText . "\n"; exit; } print 'StatusLine: ' . $responseStatusLine . "\n"; // Now get the 1st line of the response header: $responseHeaderLine = $socket->receiveToCRLF(); if ($socket->LastMethodSuccess != 1) { print $socket->LastErrorText . "\n"; exit; } print 'HeaderLine: ' . $responseHeaderLine . "\n"; // Now read the remainder of the response header by reading until a double CRLF is seen: $remainderOfHeader = $socket->receiveUntilMatch('\r\n\r\n'); if ($socket->LastMethodSuccess != 1) { print $socket->LastErrorText . "\n"; exit; } print 'Remainder: ' . $remainderOfHeader . "\n"; // Close the connection with the server. This closes the tunnel through ssh2. // Wait a max of 20 seconds (20000 millsec) $success = $socket->Close(20000); // Close the connection with ssh2. (This closes the the tunnel through ssh1.) // The connection with ssh1 is still alive, and may be used for more connections. $ssh2->Disconnect(); $ssh1->Disconnect(); ?> |
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