unix_domain_client.py

#!/usr/bin/env python3

#                 DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#                          Version π, September 2017
#
# Everyone is permitted to copy and distribute verbatim or modified
# copies of this license document.
#
#         DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
# TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
#
#  0. You just DO WHAT THE FUCK YOU WANT TO.

import socket


if __name__ == '__main__':
    with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
        sock.connect('/var/run/example.sock')
        data = bytes(input('-> ') + '\n', 'utf-8')
        sock.send(data)
        length = len(data)
        received = str(sock.recv(length), 'utf-8').strip()
        print(received)
        sock.shutdown(socket.SHUT_RDWR)
        sock.close()

unix_domain_srv.py

#!/usr/bin/env python3

#                 DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#                          Version π, September 2017
#
# Everyone is permitted to copy and distribute verbatim or modified
# copies of this license document.
#
#         DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
# TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
#
#  0. You just DO WHAT THE FUCK YOU WANT TO.

import socketserver


class Handler(socketserver.StreamRequestHandler):
    def handle(self):
        # self.rfile is a file-like object created by the handler;
        # we can now use e.g. readline() instead of raw recv() calls
        self.data = self.rfile.readline().strip()
        print(self.data)
        # Likewise, self.wfile is a file-like object used to write back
        # to the client
        self.wfile.write(self.data.swapcase())


if __name__ == '__main__':
    with socketserver.UnixStreamServer('/var/run/example.sock', Handler) as srv:
        print('Listening...')
        srv.serve_forever()
        print('done.')