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114 lines
3.1 KiB
Python
114 lines
3.1 KiB
Python
# Minimal interface to the Internet telnet protocol.
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#
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# *** modified to use threads ***
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#
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# It refuses all telnet options and does not recognize any of the other
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# telnet commands, but can still be used to connect in line-by-line mode.
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# It's also useful to play with a number of other services,
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# like time, finger, smtp and even ftp.
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#
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# Usage: telnet host [port]
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#
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# The port may be a service name or a decimal port number;
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# it defaults to 'telnet'.
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import sys, os, time
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from socket import *
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import _thread as thread
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BUFSIZE = 8*1024
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# Telnet protocol characters
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IAC = chr(255) # Interpret as command
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DONT = chr(254)
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DO = chr(253)
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WONT = chr(252)
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WILL = chr(251)
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def main():
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if len(sys.argv) < 2:
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sys.stderr.write('usage: telnet hostname [port]\n')
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sys.exit(2)
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host = sys.argv[1]
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try:
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hostaddr = gethostbyname(host)
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except error:
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sys.stderr.write(sys.argv[1] + ': bad host name\n')
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sys.exit(2)
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#
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if len(sys.argv) > 2:
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servname = sys.argv[2]
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else:
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servname = 'telnet'
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#
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if '0' <= servname[:1] <= '9':
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port = eval(servname)
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else:
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try:
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port = getservbyname(servname, 'tcp')
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except error:
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sys.stderr.write(servname + ': bad tcp service name\n')
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sys.exit(2)
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#
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s = socket(AF_INET, SOCK_STREAM)
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#
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try:
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s.connect((host, port))
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except error as msg:
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sys.stderr.write('connect failed: %r\n' % (msg,))
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sys.exit(1)
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#
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thread.start_new(child, (s,))
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parent(s)
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def parent(s):
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# read socket, write stdout
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iac = 0 # Interpret next char as command
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opt = '' # Interpret next char as option
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while 1:
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data, dummy = s.recvfrom(BUFSIZE)
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if not data:
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# EOF -- exit
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sys.stderr.write( '(Closed by remote host)\n')
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sys.exit(1)
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cleandata = ''
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for c in data:
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if opt:
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print(ord(c))
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## print '(replying: %r)' % (opt+c,)
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s.send(opt + c)
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opt = ''
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elif iac:
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iac = 0
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if c == IAC:
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cleandata = cleandata + c
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elif c in (DO, DONT):
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if c == DO: print('(DO)', end=' ')
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else: print('(DONT)', end=' ')
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opt = IAC + WONT
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elif c in (WILL, WONT):
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if c == WILL: print('(WILL)', end=' ')
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else: print('(WONT)', end=' ')
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opt = IAC + DONT
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else:
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print('(command)', ord(c))
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elif c == IAC:
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iac = 1
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print('(IAC)', end=' ')
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else:
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cleandata = cleandata + c
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sys.stdout.write(cleandata)
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sys.stdout.flush()
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## print 'Out:', repr(cleandata)
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def child(s):
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# read stdin, write socket
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while 1:
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line = sys.stdin.readline()
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## print 'Got:', repr(line)
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if not line: break
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s.send(line)
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main()
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