Convert IAC IAC to IAC in Telnet Binary Mode

app/Classes/Sock/SocketClient.php

@@ -433,7 +433,34 @@ final class SocketClient {
 			if ($flags !== MSG_PEEK)
 				$this->rx_buf = substr($this->rx_buf,strlen($result));
 
-			return $result;
+			// In case we are in Telnet Binary Mode
+			if ($this->iac_bin) {
+				if (self::DEBUG)
+					Log::debug(sprintf('%s:- Telnet IAC Binary Mode, looking for ff ff',self::LOGKEY));
+
+				// if the last char is ff, we need to get the next char
+				if (str_ends_with($result,"\xff")) {
+					// If we have it in our buffer, just get it
+					if ($this->rx_left) {
+						$result .= substr($this->rx_buf,0,1);
+						$this->rx_buf = substr($this->rx_buf,1);
+
+					// Else put everything back into rx_buf, and increase len by 1
+					} else {
+						$this->rx_buf = $result;
+						$len++;
+						$result = NULL;
+					}
+				}
+
+				if (strlen($result) > 1)
+					$result = str_replace("\xff\xff","\xff",$result);
+
+				if ($result)
+					return $result;
+
+			} else
+				return $result;
 		}
 
 		if (self::DEBUG)