Mercurial > cpython-lru_cache-weakref
annotate Lib/telnetlib.py @ 25838:8540887bcec6 2.2
Backport of 2.183:
Fix memory leak in add_subclass() found by NealN with valgrind.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Fri, 18 Oct 2002 13:42:21 +0000 |
| parents | 1a3270e26c16 |
| children | ea979c5206b7 |
| rev | line source |
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1 """TELNET client class. |
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2 |
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3 Based on RFC 854: TELNET Protocol Specification, by J. Postel and |
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4 J. Reynolds |
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5 |
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6 Example: |
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7 |
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8 >>> from telnetlib import Telnet |
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9 >>> tn = Telnet('www.python.org', 79) # connect to finger port |
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10 >>> tn.write('guido\r\n') |
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11 >>> print tn.read_all() |
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12 Login Name TTY Idle When Where |
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13 guido Guido van Rossum pts/2 <Dec 2 11:10> snag.cnri.reston.. |
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14 |
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15 >>> |
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16 |
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17 Note that read_all() won't read until eof -- it just reads some data |
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18 -- but it guarantees to read at least one byte unless EOF is hit. |
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19 |
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20 It is possible to pass a Telnet object to select.select() in order to |
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21 wait until more data is available. Note that in this case, |
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22 read_eager() may return '' even if there was data on the socket, |
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23 because the protocol negotiation may have eaten the data. This is why |
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24 EOFError is needed in some cases to distinguish between "no data" and |
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25 "connection closed" (since the socket also appears ready for reading |
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26 when it is closed). |
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27 |
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28 Bugs: |
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29 - may hang when connection is slow in the middle of an IAC sequence |
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30 |
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31 To do: |
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32 - option negotiation |
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33 - timeout should be intrinsic to the connection object instead of an |
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34 option on one of the read calls only |
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35 |
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36 """ |
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37 |
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38 |
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39 # Imported modules |
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40 import sys |
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41 import socket |
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42 import select |
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43 |
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44 __all__ = ["Telnet"] |
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45 |
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46 # Tunable parameters |
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47 DEBUGLEVEL = 0 |
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48 |
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49 # Telnet protocol defaults |
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50 TELNET_PORT = 23 |
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51 |
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52 # Telnet protocol characters (don't change) |
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53 IAC = chr(255) # "Interpret As Command" |
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54 DONT = chr(254) |
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55 DO = chr(253) |
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56 WONT = chr(252) |
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57 WILL = chr(251) |
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58 theNULL = chr(0) |
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59 |
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60 # Telnet protocol options code (don't change) |
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61 # These ones all come from arpa/telnet.h |
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62 BINARY = chr(0) # 8-bit data path |
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63 ECHO = chr(1) # echo |
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64 RCP = chr(2) # prepare to reconnect |
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65 SGA = chr(3) # suppress go ahead |
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66 NAMS = chr(4) # approximate message size |
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67 STATUS = chr(5) # give status |
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68 TM = chr(6) # timing mark |
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69 RCTE = chr(7) # remote controlled transmission and echo |
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70 NAOL = chr(8) # negotiate about output line width |
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71 NAOP = chr(9) # negotiate about output page size |
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72 NAOCRD = chr(10) # negotiate about CR disposition |
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73 NAOHTS = chr(11) # negotiate about horizontal tabstops |
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74 NAOHTD = chr(12) # negotiate about horizontal tab disposition |
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75 NAOFFD = chr(13) # negotiate about formfeed disposition |
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76 NAOVTS = chr(14) # negotiate about vertical tab stops |
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77 NAOVTD = chr(15) # negotiate about vertical tab disposition |
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78 NAOLFD = chr(16) # negotiate about output LF disposition |
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79 XASCII = chr(17) # extended ascii character set |
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80 LOGOUT = chr(18) # force logout |
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81 BM = chr(19) # byte macro |
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82 DET = chr(20) # data entry terminal |
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83 SUPDUP = chr(21) # supdup protocol |
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84 SUPDUPOUTPUT = chr(22) # supdup output |
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85 SNDLOC = chr(23) # send location |
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86 TTYPE = chr(24) # terminal type |
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87 EOR = chr(25) # end or record |
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88 TUID = chr(26) # TACACS user identification |
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89 OUTMRK = chr(27) # output marking |
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90 TTYLOC = chr(28) # terminal location number |
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91 VT3270REGIME = chr(29) # 3270 regime |
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92 X3PAD = chr(30) # X.3 PAD |
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93 NAWS = chr(31) # window size |
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94 TSPEED = chr(32) # terminal speed |
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95 LFLOW = chr(33) # remote flow control |
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96 LINEMODE = chr(34) # Linemode option |
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97 XDISPLOC = chr(35) # X Display Location |
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98 OLD_ENVIRON = chr(36) # Old - Environment variables |
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99 AUTHENTICATION = chr(37) # Authenticate |
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100 ENCRYPT = chr(38) # Encryption option |
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101 NEW_ENVIRON = chr(39) # New - Environment variables |
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102 # the following ones come from |
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103 # http://www.iana.org/assignments/telnet-options |
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104 # Unfortunately, that document does not assign identifiers |
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105 # to all of them, so we are making them up |
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106 TN3270E = chr(40) # TN3270E |
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107 XAUTH = chr(41) # XAUTH |
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108 CHARSET = chr(42) # CHARSET |
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109 RSP = chr(43) # Telnet Remote Serial Port |
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110 COM_PORT_OPTION = chr(44) # Com Port Control Option |
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111 SUPPRESS_LOCAL_ECHO = chr(45) # Telnet Suppress Local Echo |
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112 TLS = chr(46) # Telnet Start TLS |
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113 KERMIT = chr(47) # KERMIT |
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114 SEND_URL = chr(48) # SEND-URL |
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115 FORWARD_X = chr(49) # FORWARD_X |
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116 PRAGMA_LOGON = chr(138) # TELOPT PRAGMA LOGON |
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117 SSPI_LOGON = chr(139) # TELOPT SSPI LOGON |
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118 PRAGMA_HEARTBEAT = chr(140) # TELOPT PRAGMA HEARTBEAT |
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119 EXOPL = chr(255) # Extended-Options-List |
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120 |
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121 class Telnet: |
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122 |
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123 """Telnet interface class. |
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124 |
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125 An instance of this class represents a connection to a telnet |
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126 server. The instance is initially not connected; the open() |
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127 method must be used to establish a connection. Alternatively, the |
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128 host name and optional port number can be passed to the |
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129 constructor, too. |
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130 |
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131 Don't try to reopen an already connected instance. |
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132 |
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133 This class has many read_*() methods. Note that some of them |
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134 raise EOFError when the end of the connection is read, because |
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135 they can return an empty string for other reasons. See the |
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136 individual doc strings. |
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137 |
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138 read_until(expected, [timeout]) |
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139 Read until the expected string has been seen, or a timeout is |
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140 hit (default is no timeout); may block. |
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141 |
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142 read_all() |
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143 Read all data until EOF; may block. |
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144 |
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145 read_some() |
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146 Read at least one byte or EOF; may block. |
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147 |
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148 read_very_eager() |
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149 Read all data available already queued or on the socket, |
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150 without blocking. |
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151 |
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152 read_eager() |
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153 Read either data already queued or some data available on the |
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154 socket, without blocking. |
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155 |
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156 read_lazy() |
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157 Read all data in the raw queue (processing it first), without |
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158 doing any socket I/O. |
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159 |
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160 read_very_lazy() |
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161 Reads all data in the cooked queue, without doing any socket |
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162 I/O. |
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163 |
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164 set_option_negotiation_callback(callback) |
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165 Each time a telnet option is read on the input flow, this callback |
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166 (if set) is called with the following parameters : |
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167 callback(telnet socket, command (DO/DONT/WILL/WONT), option) |
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168 No other action is done afterwards by telnetlib. |
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169 |
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170 """ |
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171 |
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172 def __init__(self, host=None, port=0): |
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173 """Constructor. |
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174 |
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175 When called without arguments, create an unconnected instance. |
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176 With a hostname argument, it connects the instance; a port |
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177 number is optional. |
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178 |
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179 """ |
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180 self.debuglevel = DEBUGLEVEL |
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181 self.host = host |
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182 self.port = port |
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183 self.sock = None |
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184 self.rawq = '' |
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185 self.irawq = 0 |
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186 self.cookedq = '' |
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187 self.eof = 0 |
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188 self.option_callback = None |
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189 if host: |
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190 self.open(host, port) |
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191 |
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192 def open(self, host, port=0): |
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193 """Connect to a host. |
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194 |
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195 The optional second argument is the port number, which |
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196 defaults to the standard telnet port (23). |
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197 |
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198 Don't try to reopen an already connected instance. |
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199 |
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200 """ |
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201 self.eof = 0 |
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202 if not port: |
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203 port = TELNET_PORT |
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204 self.host = host |
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205 self.port = port |
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206 msg = "getaddrinfo returns an empty list" |
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207 for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM): |
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208 af, socktype, proto, canonname, sa = res |
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209 try: |
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210 self.sock = socket.socket(af, socktype, proto) |
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211 self.sock.connect(sa) |
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212 except socket.error, msg: |
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213 if self.sock: |
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214 self.sock.close() |
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215 self.sock = None |
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216 continue |
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217 break |
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218 if not self.sock: |
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219 raise socket.error, msg |
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220 |
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221 def __del__(self): |
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222 """Destructor -- close the connection.""" |
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223 self.close() |
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224 |
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225 def msg(self, msg, *args): |
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226 """Print a debug message, when the debug level is > 0. |
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227 |
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228 If extra arguments are present, they are substituted in the |
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229 message using the standard string formatting operator. |
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230 |
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231 """ |
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232 if self.debuglevel > 0: |
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233 print 'Telnet(%s,%d):' % (self.host, self.port), |
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234 if args: |
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235 print msg % args |
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236 else: |
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237 print msg |
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238 |
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239 def set_debuglevel(self, debuglevel): |
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240 """Set the debug level. |
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241 |
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242 The higher it is, the more debug output you get (on sys.stdout). |
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243 |
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244 """ |
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245 self.debuglevel = debuglevel |
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246 |
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247 def close(self): |
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248 """Close the connection.""" |
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249 if self.sock: |
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250 self.sock.close() |
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251 self.sock = 0 |
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252 self.eof = 1 |
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253 |
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254 def get_socket(self): |
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255 """Return the socket object used internally.""" |
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256 return self.sock |
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257 |
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258 def fileno(self): |
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259 """Return the fileno() of the socket object used internally.""" |
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260 return self.sock.fileno() |
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261 |
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262 def write(self, buffer): |
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263 """Write a string to the socket, doubling any IAC characters. |
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264 |
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265 Can block if the connection is blocked. May raise |
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266 socket.error if the connection is closed. |
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267 |
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268 """ |
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269 if IAC in buffer: |
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270 buffer = buffer.replace(IAC, IAC+IAC) |
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271 self.msg("send %s", `buffer`) |
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272 self.sock.sendall(buffer) |
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273 |
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274 def read_until(self, match, timeout=None): |
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275 """Read until a given string is encountered or until timeout. |
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276 |
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277 When no match is found, return whatever is available instead, |
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278 possibly the empty string. Raise EOFError if the connection |
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279 is closed and no cooked data is available. |
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280 |
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281 """ |
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282 n = len(match) |
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283 self.process_rawq() |
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284 i = self.cookedq.find(match) |
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285 if i >= 0: |
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286 i = i+n |
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287 buf = self.cookedq[:i] |
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288 self.cookedq = self.cookedq[i:] |
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289 return buf |
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290 s_reply = ([self], [], []) |
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291 s_args = s_reply |
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292 if timeout is not None: |
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293 s_args = s_args + (timeout,) |
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294 while not self.eof and apply(select.select, s_args) == s_reply: |
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295 i = max(0, len(self.cookedq)-n) |
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296 self.fill_rawq() |
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297 self.process_rawq() |
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298 i = self.cookedq.find(match, i) |
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299 if i >= 0: |
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300 i = i+n |
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301 buf = self.cookedq[:i] |
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302 self.cookedq = self.cookedq[i:] |
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303 return buf |
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304 return self.read_very_lazy() |
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305 |
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306 def read_all(self): |
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307 """Read all data until EOF; block until connection closed.""" |
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308 self.process_rawq() |
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309 while not self.eof: |
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310 self.fill_rawq() |
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311 self.process_rawq() |
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312 buf = self.cookedq |
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313 self.cookedq = '' |
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314 return buf |
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315 |
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316 def read_some(self): |
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317 """Read at least one byte of cooked data unless EOF is hit. |
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318 |
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319 Return '' if EOF is hit. Block if no data is immediately |
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320 available. |
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321 |
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322 """ |
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323 self.process_rawq() |
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324 while not self.cookedq and not self.eof: |
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325 self.fill_rawq() |
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326 self.process_rawq() |
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327 buf = self.cookedq |
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328 self.cookedq = '' |
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329 return buf |
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330 |
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331 def read_very_eager(self): |
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332 """Read everything that's possible without blocking in I/O (eager). |
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333 |
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334 Raise EOFError if connection closed and no cooked data |
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335 available. Return '' if no cooked data available otherwise. |
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336 Don't block unless in the midst of an IAC sequence. |
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337 |
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338 """ |
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339 self.process_rawq() |
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340 while not self.eof and self.sock_avail(): |
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341 self.fill_rawq() |
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342 self.process_rawq() |
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343 return self.read_very_lazy() |
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344 |
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345 def read_eager(self): |
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346 """Read readily available data. |
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347 |
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348 Raise EOFError if connection closed and no cooked data |
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349 available. Return '' if no cooked data available otherwise. |
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350 Don't block unless in the midst of an IAC sequence. |
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351 |
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352 """ |
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353 self.process_rawq() |
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354 while not self.cookedq and not self.eof and self.sock_avail(): |
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355 self.fill_rawq() |
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356 self.process_rawq() |
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357 return self.read_very_lazy() |
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358 |
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359 def read_lazy(self): |
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360 """Process and return data that's already in the queues (lazy). |
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361 |
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362 Raise EOFError if connection closed and no data available. |
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363 Return '' if no cooked data available otherwise. Don't block |
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364 unless in the midst of an IAC sequence. |
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365 |
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366 """ |
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367 self.process_rawq() |
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368 return self.read_very_lazy() |
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369 |
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370 def read_very_lazy(self): |
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371 """Return any data available in the cooked queue (very lazy). |
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372 |
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373 Raise EOFError if connection closed and no data available. |
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374 Return '' if no cooked data available otherwise. Don't block. |
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375 |
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376 """ |
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377 buf = self.cookedq |
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378 self.cookedq = '' |
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379 if not buf and self.eof and not self.rawq: |
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380 raise EOFError, 'telnet connection closed' |
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381 return buf |
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382 |
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383 def set_option_negotiation_callback(self, callback): |
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384 """Provide a callback function called after each receipt of a telnet option.""" |
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385 self.option_callback = callback |
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386 |
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387 def process_rawq(self): |
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388 """Transfer from raw queue to cooked queue. |
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389 |
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390 Set self.eof when connection is closed. Don't block unless in |
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391 the midst of an IAC sequence. |
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392 |
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393 """ |
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394 buf = '' |
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395 try: |
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396 while self.rawq: |
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397 c = self.rawq_getchar() |
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398 if c == theNULL: |
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399 continue |
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400 if c == "\021": |
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401 continue |
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402 if c != IAC: |
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403 buf = buf + c |
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404 continue |
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405 c = self.rawq_getchar() |
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406 if c == IAC: |
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407 buf = buf + c |
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408 elif c in (DO, DONT): |
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409 opt = self.rawq_getchar() |
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410 self.msg('IAC %s %d', c == DO and 'DO' or 'DONT', ord(opt)) |
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411 if self.option_callback: |
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412 self.option_callback(self.sock, c, opt) |
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413 else: |
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414 self.sock.sendall(IAC + WONT + opt) |
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415 elif c in (WILL, WONT): |
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416 opt = self.rawq_getchar() |
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417 self.msg('IAC %s %d', |
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418 c == WILL and 'WILL' or 'WONT', ord(opt)) |
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419 if self.option_callback: |
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420 self.option_callback(self.sock, c, opt) |
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421 else: |
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422 self.sock.sendall(IAC + DONT + opt) |
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423 else: |
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424 self.msg('IAC %d not recognized' % ord(c)) |
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425 except EOFError: # raised by self.rawq_getchar() |
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426 pass |
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427 self.cookedq = self.cookedq + buf |
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428 |
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429 def rawq_getchar(self): |
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430 """Get next char from raw queue. |
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431 |
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432 Block if no data is immediately available. Raise EOFError |
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433 when connection is closed. |
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434 |
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435 """ |
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436 if not self.rawq: |
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437 self.fill_rawq() |
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438 if self.eof: |
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439 raise EOFError |
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440 c = self.rawq[self.irawq] |
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441 self.irawq = self.irawq + 1 |
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442 if self.irawq >= len(self.rawq): |
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443 self.rawq = '' |
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444 self.irawq = 0 |
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445 return c |
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446 |
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447 def fill_rawq(self): |
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448 """Fill raw queue from exactly one recv() system call. |
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449 |
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450 Block if no data is immediately available. Set self.eof when |
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451 connection is closed. |
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452 |
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453 """ |
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454 if self.irawq >= len(self.rawq): |
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455 self.rawq = '' |
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456 self.irawq = 0 |
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457 # The buffer size should be fairly small so as to avoid quadratic |
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458 # behavior in process_rawq() above |
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459 buf = self.sock.recv(50) |
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460 self.msg("recv %s", `buf`) |
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461 self.eof = (not buf) |
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462 self.rawq = self.rawq + buf |
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463 |
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464 def sock_avail(self): |
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465 """Test whether data is available on the socket.""" |
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466 return select.select([self], [], [], 0) == ([self], [], []) |
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467 |
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468 def interact(self): |
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469 """Interaction function, emulates a very dumb telnet client.""" |
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470 if sys.platform == "win32": |
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471 self.mt_interact() |
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472 return |
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473 while 1: |
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474 rfd, wfd, xfd = select.select([self, sys.stdin], [], []) |
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475 if self in rfd: |
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476 try: |
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477 text = self.read_eager() |
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478 except EOFError: |
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479 print '*** Connection closed by remote host ***' |
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480 break |
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481 if text: |
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482 sys.stdout.write(text) |
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483 sys.stdout.flush() |
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484 if sys.stdin in rfd: |
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485 line = sys.stdin.readline() |
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486 if not line: |
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487 break |
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488 self.write(line) |
|
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489 |
|
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|
490 def mt_interact(self): |
|
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491 """Multithreaded version of interact().""" |
|
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492 import thread |
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493 thread.start_new_thread(self.listener, ()) |
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494 while 1: |
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|
495 line = sys.stdin.readline() |
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496 if not line: |
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|
497 break |
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498 self.write(line) |
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|
499 |
|
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|
500 def listener(self): |
|
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501 """Helper for mt_interact() -- this executes in the other thread.""" |
|
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502 while 1: |
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503 try: |
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504 data = self.read_eager() |
|
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505 except EOFError: |
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506 print '*** Connection closed by remote host ***' |
|
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507 return |
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|
508 if data: |
|
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|
509 sys.stdout.write(data) |
|
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|
510 else: |
|
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|
511 sys.stdout.flush() |
|
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|
512 |
|
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|
513 def expect(self, list, timeout=None): |
|
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514 """Read until one from a list of a regular expressions matches. |
|
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|
515 |
|
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|
516 The first argument is a list of regular expressions, either |
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517 compiled (re.RegexObject instances) or uncompiled (strings). |
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518 The optional second argument is a timeout, in seconds; default |
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519 is no timeout. |
|
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520 |
|
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521 Return a tuple of three items: the index in the list of the |
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|
522 first regular expression that matches; the match object |
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523 returned; and the text read up till and including the match. |
|
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524 |
|
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525 If EOF is read and no text was read, raise EOFError. |
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526 Otherwise, when nothing matches, return (-1, None, text) where |
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527 text is the text received so far (may be the empty string if a |
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528 timeout happened). |
|
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|
529 |
|
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530 If a regular expression ends with a greedy match (e.g. '.*') |
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531 or if more than one expression can match the same input, the |
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532 results are undeterministic, and may depend on the I/O timing. |
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533 |
|
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534 """ |
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535 re = None |
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536 list = list[:] |
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537 indices = range(len(list)) |
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538 for i in indices: |
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539 if not hasattr(list[i], "search"): |
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540 if not re: import re |
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541 list[i] = re.compile(list[i]) |
|
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542 while 1: |
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543 self.process_rawq() |
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544 for i in indices: |
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545 m = list[i].search(self.cookedq) |
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546 if m: |
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547 e = m.end() |
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548 text = self.cookedq[:e] |
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549 self.cookedq = self.cookedq[e:] |
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550 return (i, m, text) |
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551 if self.eof: |
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552 break |
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553 if timeout is not None: |
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554 r, w, x = select.select([self.fileno()], [], [], timeout) |
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555 if not r: |
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556 break |
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557 self.fill_rawq() |
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558 text = self.read_very_lazy() |
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559 if not text and self.eof: |
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560 raise EOFError |
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561 return (-1, None, text) |
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562 |
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563 |
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564 def test(): |
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565 """Test program for telnetlib. |
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566 |
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567 Usage: python telnetlib.py [-d] ... [host [port]] |
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568 |
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569 Default host is localhost; default port is 23. |
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570 |
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571 """ |
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572 debuglevel = 0 |
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573 while sys.argv[1:] and sys.argv[1] == '-d': |
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574 debuglevel = debuglevel+1 |
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575 del sys.argv[1] |
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576 host = 'localhost' |
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577 if sys.argv[1:]: |
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578 host = sys.argv[1] |
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579 port = 0 |
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580 if sys.argv[2:]: |
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581 portstr = sys.argv[2] |
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582 try: |
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583 port = int(portstr) |
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584 except ValueError: |
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585 port = socket.getservbyname(portstr, 'tcp') |
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586 tn = Telnet() |
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587 tn.set_debuglevel(debuglevel) |
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588 tn.open(host, port) |
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589 tn.interact() |
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590 tn.close() |
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591 |
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592 if __name__ == '__main__': |
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593 test() |
