1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
#! /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 = 1024
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', `data`, 'from', `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', `data`, 'from', `fromaddr`
main()
|
