105 lines
2.5 KiB
Python
105 lines
2.5 KiB
Python
#!/usr/local/bin/python2
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#
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# This quick-and-dirty script supports only the happy case of SMTP session,
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# i.e. what gpg-mailgate/gpg-lacre needs to deliver encrypted email.
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#
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# It listens on the port given as the only command-line argument and consumes a
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# message, then prints it to standard output. The goal is to be able to
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# compare that output with expected clear-text or encrypted message body.
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#
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import sys
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import socket
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import logging
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EXIT_UNAVAILABLE = 1
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ENCODING = 'utf-8'
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BUFFER_SIZE = 4096
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EOM = "\r\n.\r\n"
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LAST_LINE = -3
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def welcome(msg):
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return b"220 %b\r\n" % (msg)
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def ok(msg = b"OK"):
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return b"250 %b\r\n" % (msg)
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def bye():
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return b"251 Bye"
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def provide_message():
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return b"354 Enter a message, ending it with a '.' on a line by itself\r\n"
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def receive_and_confirm(session):
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session.recv(BUFFER_SIZE)
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session.sendall(ok())
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def localhost_at(port):
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return ('127.0.0.1', port)
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def serve(port):
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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s.bind(localhost_at(port))
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logging.info(f"Listening on localhost, port {port}")
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s.listen(1)
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logging.info("Listening...")
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except socket.error as e:
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print("Cannot connect", e)
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logging.error(f"Cannot connect {e}")
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sys.exit(EXIT_UNAVAILABLE)
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logging.debug("About to accept a connection...")
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(conn, addr) = s.accept()
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logging.debug(f"Accepting connection from {conn}")
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conn.sendall(welcome(b"TEST SERVER"))
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receive_and_confirm(conn) # Ignore HELO/EHLO
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receive_and_confirm(conn) # Ignore sender address
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receive_and_confirm(conn) # Ignore recipient address
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data = conn.recv(BUFFER_SIZE)
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conn.sendall(provide_message())
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# Consume until we get <CR><LF>.<CR><LF>, the end-of-message marker.
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message = ''
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while not message.endswith(EOM):
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message += conn.recv(BUFFER_SIZE).decode(ENCODING)
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conn.sendall(ok(b"OK, id=test"))
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conn.recv(BUFFER_SIZE)
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conn.sendall(bye())
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conn.close()
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logging.debug(f"Received {len(message)} characters of data")
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# Trim EOM marker as we're only interested in the message body.
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return message[:-len(EOM)]
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def error(msg, exit_code):
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logging.error(msg)
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print("ERROR: %s" % (msg))
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sys.exit(exit_code)
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# filename is relative to where we run the tests from, i.e. the project root
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# directory
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logging.basicConfig(filename = 'test/logs/relay.log',
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format = '%(asctime)s %(pathname)s:%(lineno)d %(levelname)s [%(funcName)s] %(message)s',
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datefmt = '%Y-%m-%d %H:%M:%S',
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level = logging.DEBUG)
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if len(sys.argv) < 2:
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error("Usage: relay.py PORT_NUMBER", EXIT_UNAVAILABLE)
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port = int(sys.argv[1])
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body = serve(port)
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print(body)
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