Pexpect telnet into one device and then from there to another Post: 302766395

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Top Forums Programming Pexpect telnet into one device and then from there to another Post 302766395 by kaf3773 on Monday 4th of February 2013 04:16:06 PM

02-04-2013

Registered User

Pexpect telnet into one device and then from there to another

I am trying to use pexpect to telnet to a device and then subsequently
telnet from that device to another device but i am unable to. Here is the
script i wrote and the error i am getting

I will appreciate help very much. Thanks

Code:

import pexpect

child = pexpect.spawn('telnet 192.168.2.45');

child.expect('assword:');
child.sendline('getin');

child.expect('AS-C5350-02>');
child.sendline('telnet 192.168.1.2'); 
child.expect('\nTrying 192.168.1.2 ... Open\n\n\nUser Access Verification\n\nPassword:');
child.sendline('cisco'); 
child.expect('ipipgw01>'); 
child.sendline('sh clock');
child.sendline('exit');

child.expect(pexpect.EOF);

print child.before;

This is the error i keep getting

Code:

Traceback (most recent call last):
  File "expect_telnetback.py", line 14, in <module>
    child.expect('\nTrying 192.168.1.2 ... Open\n\n\nUser Access Verification\n\nPassword:');
  File "/usr/lib/python2.6/dist-packages/pexpect.py", line 1311, in expect
    return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
  File "/usr/lib/python2.6/dist-packages/pexpect.py", line 1325, in expect_list
    return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
  File "/usr/lib/python2.6/dist-packages/pexpect.py", line 1409, in expect_loop
    raise TIMEOUT (str(e) + '\n' + str(self))
pexpect.TIMEOUT: Timeout exceeded in read_nonblocking().
<pexpect.spawn object at 0xb7752a2c>
version: 2.3 ($Revision: 399 $)
command: /usr/bin/telnet
args: ['/usr/bin/telnet', '192.168.2.45']
searcher: searcher_re:
    0: re.compile("
Trying 196.192.7.14 ... Open


User Access Verification

Password:")
buffer (last 100 chars): telnet 192.168.1.2
Trying 192.168.1.2 ... Open


User Access Verification

Password: 
before (last 100 chars): telnet 192.168.1.2
Trying 192.168.1.2 ... Open


User Access Verification

Password: 
after: <class 'pexpect.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 26275
child_fd: 3
closed: False
timeout: 30
delimiter: <class 'pexpect.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1

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LEARN ABOUT CENTOS

telnet-probe

TELNET-PROBE(1) 					      General Commands Manual						   TELNET-PROBE(1)

NAME

       telnet-probe - lightweight telnet-like port probe

SYNOPSIS

       $PCP_BINADM_DIR/telnet-probe [-c] [-v] host port

DESCRIPTION

       telnet-probe  allows  the  pmdashping(1)  daemons  to establish connections to arbitrary local and remote service-providing daemons so that
       response time and service availability information can be obtained.

       The required host and port number arguments have the same meaning as their telnet(1) equivalents.

       The -c option causes telnet-probe to perform a connect(2) only.	This skips the read(2) and write(2) exercise that would otherwise be  done
       after connecting (see below).

       The -v option causes telnet-probe to be verbose while operating.

       Once the telnet connection has been established, telnet-probe reads from stdin until end-of-file, and writes all the input data to the tel-
       net connection.	Next, telnet-probe will read from the telnet connection until end-of-file, discarding whatever	data  it  receives.   Then
       telnet-probe exits.

       To  operate  successfully,  the input passed via telnet-probe to the remote service must be sufficient to cause the remote service to close
       the connection when the last line of input has been processed, e.g. ending with ``quit'' when probing SMTP on port 25.

       By default telnet-probe will not produce any output, unless there is an error in which case a diagnostic message can be displayed (in  ver-
       bose mode only) and the exit status will be non-zero indicating a failure.

PCP ENVIRONMENT

       Environment  variables  with  the prefix PCP_ are used to parameterize the file and directory names used by PCP.  On each installation, the
       file /etc/pcp.conf contains the local values for these variables.  The $PCP_CONF variable may be used to specify an alternative	configura-
       tion file, as described in pcp.conf(5).

DIAGNOSTICS

       If  telnet-probe  succeeds, then 0 will be returned.  If the attempt to establish a connection fails or is terminated, then a non-zero exit
       status is returned.

SEE ALSO

       PCPintro(1), pmdashping(1), pmie(1), telnet(1), connect(2), read(2) and write(2).

Performance Co-Pilot							PCP							   TELNET-PROBE(1)