Created
August 13, 2022 05:15
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Minimal UDP echo tool.
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#! /usr/bin/env python | |
# Client and server for udp (datagram) echo. | |
# | |
# Usage: udpecho -s [port] (to start a server) | |
# or: udpecho -c host [port] <file (client) | |
import sys | |
from socket import * | |
ECHO_PORT = 50000 + 7 | |
BUFSIZE = 65535 | |
def main(): | |
if len(sys.argv) < 2: | |
usage() | |
if sys.argv[1] == '-s': | |
server() | |
elif sys.argv[1] == '-c': | |
client() | |
else: | |
usage() | |
def usage(): | |
sys.stdout = sys.stderr | |
print 'Usage: udpecho -s [port] (server)' | |
print 'or: udpecho -c host [port] <file (client)' | |
sys.exit(2) | |
def server(): | |
if len(sys.argv) > 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 = socket(AF_INET, SOCK_DGRAM) | |
s.bind(('', 0)) | |
print 'udp echo client ready, reading stdin' | |
while 1: | |
line = sys.stdin.readline() | |
if not line: | |
break | |
s.sendto(line, addr) | |
data, fromaddr = s.recvfrom(BUFSIZE) | |
print 'client received %r from %r' % (data, fromaddr) | |
main() |
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