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#! /usr/bin/python2.7 # Client and server for udp (datagram) echo. # # Usage: udpecho -s [port] (to start a server) # or: udpecho -c host [port] 2: port = eval(sys.argv[2]) else: port = ECHO_PORT s = socket(AF_INET, SOCK_DGRAM) s.bind(('', port)) print 'udp echo server ready' while 1: data, addr = s.recvfrom(BUFSIZE) print 'server received %r from %r' % (data, addr) s.sendto(data, addr) def client(): if len(sys.argv) < 3: usage() host = sys.argv[2] if len(sys.argv) > 3: port = eval(sys.argv[3]) else: port = ECHO_PORT addr = host, port s = sock