Exception when parsing binary data

[edeca]

aiosmtpd will try to ASCII decode binary data as SMTP commands, raising a UnicodeDecodeError. A simple test case that triggers this is shown at the end of this report. This can be caught by a generic exception handler, however it would be better to do this inside the library.

This can be trivially fixed with a try/except handler. PR incoming.

from base64 import b64decode
import socket


TCP_IP = '127.0.0.1'
TCP_PORT = 8025
BUFFER_SIZE = 1024

RAW = "gUMBAwMBGgAAACAAwDAAwCwAwCgAwCQAwBQAwAoAwCIAwCEAAKMAAJ8AAGsAAGoAADkAADgAAIgAAIcAwBkAwCAAwDIAwC4AwCoAwCYAwA8AwAUAAJ0AAD0AADUAAIQAwBIAwAgAwBwAwBsAABYAABMAwBcAwBoAwA0AwAMAAAoHAMAAwC8AwCsAwCcAwCMAwBMAwAkAwB8AwB4AAKIAAJ4AAGcAAEAAADMAADIAAJoAAJkAAEUAAEQAwBgAwB0AwDEAwC0AwCkAwCUAwA4AwAQAAJwAADwAAC8AAJYAAEEAAAcAwBEAwAcAwBYAwAwAwAIAAAUAAAQFAIADAIABAIAAABUAABIAAAkGAEAAABQAABEAAAgAAAYAAAMEAIACAIAAAP8cXF6WB1DBTAUUZfksmYhwy/mtOvciiLZb+ZNMaF/tYg=="
MESSAGE = b64decode(RAW)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
data = s.recv(BUFFER_SIZE)
print("Received: {}".format(data))
s.send(MESSAGE)
data = s.recv(BUFFER_SIZE)
print("Received: {}".format(data))
s.close()