Socat in one python file

The initial goal was replace socat in kubctl port-forward (which however is no longer required in newer version), so that in systems that were not able to install socat this script could be a replacement.

What's been done

• TCP-LISTEN:<port> for creating server
  • only fork and reuseaddr option were implemented
• TCP:<host>:<port> and TCP4:<host>:<port> for create connections
• OPEN:<file-path> for opening file for reading
• - for stdin and stdout, you could use shell's redir for reading from and writing to files
• No line ending tranlation at all. (I don't need it)

None Goal

• Implement all the features of socat

Example

./pscat.py <addr1> <addr2>

Think pscat as a tool for creating pipes connecting the read end of addr1 and write end of addr2 and vice versa.

As an echo server

./pscat.py - TCP-LISTEN:8080

Note that TCP-LISTEN will accept only one connection. If you need to keep the server running, add fork option:

./pscat.py - TCP-LISTEN:8080,fork

As an echo client

./pscat.py - TCP:localhost:8080

transfer a file

# server side for receiving (with an IP for connection)
./pscat.py - TCP-LISTEN:8080 > file
# client side for sending
./pscat.py - TCP:server:8080 < file

# server side for sending (with an IP for connection)
./pscat.py - TCP-LISTEN:8080 < file
# client side for receiving
./pscat.py - TCP:server:8080 > file

As a proxy

Listening on port 8080 and transfer all data to remote:port.

./pscat.py TCP-LISTEN:8080 TCP:remote:port