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(PHP ActiveX) TCP Socket through SSH Tunnel (Port Forwarding)Demonstrates using Chilkat Socket to communicate to a TCP service through an SSH tunnel. This example will connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time. Note: This is not necessarily a recommended means for getting the current date/time. The most commonly used time protocol is the Network Time Protocol (RFC-1305). The intent of this example is to show how TCP communications can occur through an SSH tunnel.
<?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.Socket') $tunnel = new COM("Chilkat.Socket"); $sshHostname = 'sftp.example.com'; $sshPort = 22; // Connect to an SSH server and establish the SSH tunnel: $success = $tunnel->SshOpenTunnel($sshHostname,$sshPort); if ($success != 1) { print $tunnel->LastErrorText . "\n"; exit; } // Authenticate with the SSH server via a login/password // or with a public key. // This example demonstrates SSH password authentication. $success = $tunnel->SshAuthenticatePw('mySshLogin','mySshPassword'); if ($success != 1) { print $tunnel->LastErrorText . "\n"; exit; } // OK, the SSH tunnel is setup. Now open a channel within the tunnel. // Once the channel is obtained, the Socket API may // be used exactly the same as usual, except all communications // are sent through the channel in the SSH tunnel. // Any number of channels may be created from the same SSH tunnel. // Multiple channels may coexist at the same time. // Connect to an NIST time server and read the current date/time $maxWaitMs = 4000; $useTls = 0; // channel is a Chilkat.Socket $channel = $tunnel->SshOpenChannel('time-c.nist.gov',37,$useTls,$maxWaitMs); if ($tunnel->LastMethodSuccess == 0) { print $tunnel->LastErrorText . "\n"; exit; } // The time server will send a big-endian 32-bit integer representing // the number of seconds since since 00:00 (midnight) 1 January 1900 GMT. // The ReceiveInt32 method will receive a 4-byte integer, but returns // 1 or 0 to indicate success. If successful, the integer // is obtained via the ReceivedInt property. $bigEndian = 1; $success = $channel->ReceiveInt32($bigEndian); if ($success != 1) { print $channel->LastErrorText . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.CkDateTime') $dt = new COM("Chilkat.CkDateTime"); $dt->SetFromNtpTime($channel->ReceivedInt); // Show the current local date/time $bLocalTime = 1; print 'Current local date/time: ' . $dt->getAsRfc822($bLocalTime) . "\n"; // Close the SSH channel. $success = $channel->Close($maxWaitMs); if ($success != 1) { print $channel->LastErrorText . "\n"; exit; } // It is possible to create a new channel from the existing SSH tunnel for the next connection: // Any number of channels may be created from the same SSH tunnel. // Multiple channels may coexist at the same time. // channel is a Chilkat.Socket $channel = $tunnel->SshOpenChannel('time-a.nist.gov',37,$useTls,$maxWaitMs); if ($tunnel->LastMethodSuccess == 0) { print $tunnel->LastErrorText . "\n"; exit; } // Review the LastErrorText to see that the connection was made via the SSH tunnel: print $tunnel->LastErrorText . "\n"; // Close the connection to time-a.nist.gov. This is actually closing our channel // within the SSH tunnel, but keeps the tunnel open for the next port-forwarded connection. $success = $channel->Close($maxWaitMs); if ($success != 1) { print $channel->LastErrorText . "\n"; exit; } // Finally, close the SSH tunnel. $success = $tunnel->SshCloseTunnel(); if ($success != 1) { print $tunnel->LastErrorText . "\n"; exit; } print 'TCP SSH tunneling example completed.' . "\n"; ?> |
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