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    <p>This is a one command at a time function a colleague wrote. Still wondering if more can be done in terms of flexibility, efficiency, and speed.</p> <pre><code>/* * lcmd - execute LISTSERV command * * This function connects to a LISTSERV host and executes a single command * using the supplied credentials. * * Returns result from command if successful; otherwise, returns FALSE. */ function lcmd($host, $port, $user, $password, $cmd) { $request_header = ""; $request_body = ""; $response_header = ""; $response_body = ""; $length = 0; $status; $result; /* * Get host address */ $host = gethostbyname($host); /* * Connect to server */ $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if (!$socket) { return FALSE; } $status = socket_connect($socket, $host, $port); if (!$status) { return FALSE; } /* * Format request body */ $request_body = "${cmd} PW=${password}"; $length = strlen($user) + strlen($request_body) + 1; /* * Format request header */ $request_header = array(); $request_header[] = "1B\r\n"; $request_header[] = chr((int)($length / 256)); $request_header[] = chr($length % 255); $request_header[] = chr(strlen($user)); $request_header[] = $user; $request_header = implode($request_header); /* * Send request header */ $status = socket_send( $socket, $request_header, strlen($request_header), 0 ); if (strlen($request_header) != $status) { return FALSE; } /* * Receive response header */ while (socket_recv($socket, $b, 1, 0) == 1) { $response_header .= $b; if ("\n" == $b) { break; } } $status = (int)$response_header; /* * If status is not 250, then the is refusing the request. */ if (250 != $status) { return FALSE; } /* * Send request body */ $status = socket_send( $socket, $request_body, strlen($request_body), 0 ); if (strlen($request_body) != $status) { return FALSE; } /* * Receive response body * * The first 8 bytes of the body is two unsigned 32-bit integers * that define the status of the command and the length of the * result. */ $status = socket_recv($socket, $response_body, 8, 0); if (8 != $status) { return FALSE; } /* * Decode unsigned 32-bit big-endian integer status and result * length. */ $response_body = str_split($response_body); $status = ( (ord($response_body[0]) &lt;&lt; 24 ) | (ord($response_body[1]) &lt;&lt; 16 ) | (ord($response_body[2]) &lt;&lt; 8 ) | (ord($response_body[3]) &lt;&lt; 0 ) ); $length = ( (ord($response_body[4]) &lt;&lt; 24 ) | (ord($response_body[5]) &lt;&lt; 16 ) | (ord($response_body[6]) &lt;&lt; 8 ) | (ord($response_body[7]) &lt;&lt; 0 ) ); /* * If status is not 0, then command execution has failed. */ if (0 != $status) { return FALSE; } /* * Receive result */ $status = socket_recv($socket, $result, $length, MSG_WAITALL); if ($length != $status) { return FALSE; } /* * Disconnect from server */ socket_close($socket); /* * Return */ return $result; } </code></pre>
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