2 ### greet HOST PORT CHALLENGE
3 ### Sends a TrIPE greeting packet to the server listening on HOST and PORT.
4 ### The payload is the base64-encoded CHALLENGE.
10 return (s + '='*((-len(s))%4)).decode('base64')
12 addr, chal = (lambda _, h, p, c: ((h, int(p)), db64(c)))(*argv)
13 sk = S.socket(S.AF_INET, S.SOCK_DGRAM)