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-rwxr-xr-xDemo/sockets/telnet.py109
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diff --git a/Demo/sockets/telnet.py b/Demo/sockets/telnet.py
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--- a/Demo/sockets/telnet.py
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-#! /usr/bin/env python3
-
-# Minimal interface to the Internet telnet protocol.
-#
-# It refuses all telnet options and does not recognize any of the other
-# telnet commands, but can still be used to connect in line-by-line mode.
-# It's also useful to play with a number of other services,
-# like time, finger, smtp and even ftp.
-#
-# Usage: telnet host [port]
-#
-# The port may be a service name or a decimal port number;
-# it defaults to 'telnet'.
-
-
-import sys, posix, time
-from socket import *
-
-BUFSIZE = 1024
-
-# Telnet protocol characters
-
-IAC = chr(255) # Interpret as command
-DONT = chr(254)
-DO = chr(253)
-WONT = chr(252)
-WILL = chr(251)
-
-def main():
- host = sys.argv[1]
- try:
- hostaddr = gethostbyname(host)
- except error:
- sys.stderr.write(sys.argv[1] + ': bad host name\n')
- sys.exit(2)
- #
- if len(sys.argv) > 2:
- servname = sys.argv[2]
- else:
- servname = 'telnet'
- #
- if '0' <= servname[:1] <= '9':
- port = eval(servname)
- else:
- try:
- port = getservbyname(servname, 'tcp')
- except error:
- sys.stderr.write(servname + ': bad tcp service name\n')
- sys.exit(2)
- #
- s = socket(AF_INET, SOCK_STREAM)
- #
- try:
- s.connect((host, port))
- except error as msg:
- sys.stderr.write('connect failed: ' + repr(msg) + '\n')
- sys.exit(1)
- #
- pid = posix.fork()
- #
- if pid == 0:
- # child -- read stdin, write socket
- while 1:
- line = sys.stdin.readline()
- s.send(line)
- else:
- # parent -- read socket, write stdout
- iac = 0 # Interpret next char as command
- opt = '' # Interpret next char as option
- while 1:
- data = s.recv(BUFSIZE)
- if not data:
- # EOF; kill child and exit
- sys.stderr.write( '(Closed by remote host)\n')
- posix.kill(pid, 9)
- sys.exit(1)
- cleandata = ''
- for c in data:
- if opt:
- print(ord(c))
- s.send(opt + c)
- opt = ''
- elif iac:
- iac = 0
- if c == IAC:
- cleandata = cleandata + c
- elif c in (DO, DONT):
- if c == DO: print('(DO)', end=' ')
- else: print('(DONT)', end=' ')
- opt = IAC + WONT
- elif c in (WILL, WONT):
- if c == WILL: print('(WILL)', end=' ')
- else: print('(WONT)', end=' ')
- opt = IAC + DONT
- else:
- print('(command)', ord(c))
- elif c == IAC:
- iac = 1
- print('(IAC)', end=' ')
- else:
- cleandata = cleandata + c
- sys.stdout.write(cleandata)
- sys.stdout.flush()
-
-
-try:
- main()
-except KeyboardInterrupt:
- pass