Ports in FTP

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  13 years ago

  by phb5000

  Philip Bergqvist

  Sweden, Sweden

  Joined 15 years ago
  Hi,
  
  I'm currently working on a very simple, lighweight FTP server built for passive connections. This requires the FTP server to send the "PASV" command telling the client to what IP and port connections can be made to on the server for data transfer. From my "research" I found the syntax for the PASV command to be as follows:
  
  "PASV n1,n2,n3,n4,p1,p2" where n1-n4 is the IP address and p1,p2 is the port number. However, I havent been able to find any information on how to convert a decimal port number into the two "hex octets". If I wish to tell the client to connect to port 1234, what would my p1 and p2 to be?
  
  -Thanks!
  
  
  
  
  
  
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