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64 lines
1.2 KiB
Python
64 lines
1.2 KiB
Python
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#! /usr/local/python
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# Client and server for udp (datagram) echo.
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#
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# Usage: udpecho -s [port] (to start a server)
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# or: udpecho -c host [port] <file (client)
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import sys
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from socket import *
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ECHO_PORT = 50000 + 7
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BUFSIZE = 1024
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def main():
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if len(sys.argv) < 2:
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usage()
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if sys.argv[1] = '-s':
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server()
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elif sys.argv[1] = '-c':
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client()
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else:
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usage()
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def usage():
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sys.stdout = sys.stderr
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print 'Usage: udpecho -s [port] (server)'
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print 'or: udpecho -c host [port] <file (client)'
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sys.exit(2)
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def server():
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if len(sys.argv) > 2:
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port = eval(sys.argv[2])
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else:
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port = ECHO_PORT
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s = socket(AF_INET, SOCK_DGRAM)
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s.bind('', port)
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print 'udp echo server ready'
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while 1:
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data, addr = s.recvfrom(BUFSIZE)
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print 'server received', `data`, 'from', `addr`
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s.sendto(data, addr)
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def client():
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if len(sys.argv) < 3:
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usage()
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host = sys.argv[2]
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if len(sys.argv) > 3:
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port = eval(sys.argv[3])
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else:
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port = ECHO_PORT
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addr = host, port
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s = socket(AF_INET, SOCK_DGRAM)
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s.bind('', 0)
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print 'udp echo client ready, reading stdin'
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while 1:
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line = sys.stdin.readline()
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if not line:
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break
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s.sendto(line, addr)
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data, fromaddr = s.recvfrom(BUFSIZE)
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print 'client received', `data`, 'from', `fromaddr`
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main()
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