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annotate Demo/threads/telnet.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 71a294bd7950
children 6b18a095c2e7
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1 # Minimal interface to the Internet telnet protocol.
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2 #
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3 # *** modified to use threads ***
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4 #
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5 # It refuses all telnet options and does not recognize any of the other
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6 # telnet commands, but can still be used to connect in line-by-line mode.
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7 # It's also useful to play with a number of other services,
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8 # like time, finger, smtp and even ftp.
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9 #
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10 # Usage: telnet host [port]
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11 #
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12 # The port may be a service name or a decimal port number;
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13 # it defaults to 'telnet'.
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14
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15
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16 import sys, os, time
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17 from socket import *
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18 import thread
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19
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20 BUFSIZE = 8*1024
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21
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22 # Telnet protocol characters
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23
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24 IAC = chr(255) # Interpret as command
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25 DONT = chr(254)
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26 DO = chr(253)
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27 WONT = chr(252)
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28 WILL = chr(251)
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29
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30 def main():
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31 if len(sys.argv) < 2:
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32 sys.stderr.write('usage: telnet hostname [port]\n')
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33 sys.exit(2)
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34 host = sys.argv[1]
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35 try:
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36 hostaddr = gethostbyname(host)
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37 except error:
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38 sys.stderr.write(sys.argv[1] + ': bad host name\n')
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39 sys.exit(2)
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40 #
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41 if len(sys.argv) > 2:
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42 servname = sys.argv[2]
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43 else:
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44 servname = 'telnet'
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45 #
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46 if '0' <= servname[:1] <= '9':
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47 port = eval(servname)
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48 else:
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49 try:
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50 port = getservbyname(servname, 'tcp')
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51 except error:
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52 sys.stderr.write(servname + ': bad tcp service name\n')
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53 sys.exit(2)
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54 #
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55 s = socket(AF_INET, SOCK_STREAM)
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56 #
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57 try:
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58 s.connect((host, port))
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59 except error, msg:
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60 sys.stderr.write('connect failed: %r\n' % (msg,))
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61 sys.exit(1)
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62 #
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63 thread.start_new(child, (s,))
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64 parent(s)
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65
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66 def parent(s):
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67 # read socket, write stdout
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68 iac = 0 # Interpret next char as command
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69 opt = '' # Interpret next char as option
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70 while 1:
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71 data, dummy = s.recvfrom(BUFSIZE)
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72 if not data:
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73 # EOF -- exit
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74 sys.stderr.write( '(Closed by remote host)\n')
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75 sys.exit(1)
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76 cleandata = ''
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77 for c in data:
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78 if opt:
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79 print ord(c)
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80 ## print '(replying: %r)' % (opt+c,)
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81 s.send(opt + c)
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82 opt = ''
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83 elif iac:
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84 iac = 0
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85 if c == IAC:
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86 cleandata = cleandata + c
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87 elif c in (DO, DONT):
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88 if c == DO: print '(DO)',
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89 else: print '(DONT)',
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90 opt = IAC + WONT
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91 elif c in (WILL, WONT):
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92 if c == WILL: print '(WILL)',
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93 else: print '(WONT)',
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94 opt = IAC + DONT
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95 else:
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96 print '(command)', ord(c)
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97 elif c == IAC:
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98 iac = 1
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99 print '(IAC)',
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100 else:
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101 cleandata = cleandata + c
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102 sys.stdout.write(cleandata)
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103 sys.stdout.flush()
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104 ## print 'Out:', repr(cleandata)
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105
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106 def child(s):
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107 # read stdin, write socket
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108 while 1:
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109 line = sys.stdin.readline()
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110 ## print 'Got:', repr(line)
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111 if not line: break
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112 s.send(line)
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113
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114 main()