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#!/usr/bin/env python3
import socket
import sys
import getopt
def main(argv):
stype = socket.SOCK_STREAM
opts, args = getopt.getopt(argv, "u")
for opt, arg in opts:
if opt == "-u":
stype = socket.SOCK_DGRAM
s = socket.socket(socket.AF_INET, stype)
s.bind(("", 0))
print(s.getsockname()[1], flush=True)
if stype == socket.SOCK_STREAM:
s.listen(1)
s, _ = s.accept()
while 1:
data, addr = s.recvfrom(1024)
if not data:
break
if addr:
s.sendto(data, addr)
else:
s.sendall(data)
s.close()
if __name__ == "__main__":
main(sys.argv[1:])
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