def handle_command(line, mail_state):
"""Handle each SMTP command as it's sent to the server
The paramater 'line' is the currently stream of data
ending in '\\n'.
'mail_state' is an instance of 'hoard.state.MailState'.
"""
close = False
if mail_state.reading:
resp = None
# Not exactly nice but it's only way I could safely figure
# out if it was the \n.\n
if line[0] == "." and len(line) == 3 and ord(line[0]) == 46:
mail_state.reading = False
mail_state.write_to_db()
resp = response()
elif line.lower().startswith("ehlo"):
resp = ["%s\n" % x for x in EHLO_RESPONSES]
elif any(line.lower().startswith(e) for e in ['helo', 'mail from',
'rcpt to', 'noop']):
resp = response(250)
elif line.lower().startswith("rset"):
new_id = email_id()
log.debug("[%s] RSET received, changing ID to [%s]" %
(mail_state.email_id, new_id))
# Reset mail state
mail_state.reading = False
mail_state.email_id = new_id
resp = response(250)
elif line.lower().startswith("starttls"):
resp = response(220)
elif line.lower().startswith("vrfy"):
resp = response(252)
elif line.lower().startswith("quit"):
resp = response(221)
close = True
elif line.lower().startswith("data"):
resp = response(354)
mail_state.reading = True
else:
resp = response(500)
return resp, close
def connection_ready(sock, fd, events):
"""
Accepts the socket connections and passes them off
to be handled.
'sock' is an instance of 'socket'.
'fd' is an open file descriptor for the current connection.
'events' is an integer of the number of events on the socket.
"""
while True:
try:
connection, address = sock.accept()
except socket.error as e:
if e.errno not in (errno.EWOULDBLOCK, errno.EAGAIN):
raise
return
log.debug("Connection from '%s'" % address[0])
connection.setblocking(0)
stream = connection_stream(connection)
if not stream:
return
mail_state = MailState()
mail_state.address = address[0]
mail_state.email_id = email_id()
# Sadly there is nothing I can do about the handle and loop
# fuctions. They have to exist within connection_ready
def handle(line):
"""
Handle a line of socket data, figure out if
it's a valid SMTP keyword and handle it
accordingly.
"""
log.debug("[%s] RECV: %s" % (mail_state.email_id, line.rstrip()))
mail_state.commands = line.rstrip()
resp, close = handle_command(line, mail_state)
if resp:
if isinstance(resp, list):
# This is required for returning
# multiple status codes for EHLO
for r in resp:
try:
write_response(stream, mail_state, r)
except iostream.StreamClosedError:
return
else:
# Otherwise it's a single response
try:
write_response(stream, mail_state, resp)
except iostream.StreamClosedError:
return
if close is True:
log.debug("Closing")
stream.close()
return
else:
loop()
def loop():
"""
Loop over the socket data until we receive
a newline character (\n)
"""
stream.read_until("\n", handle)
stream.write(response(220))
loop()
