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POExpect Output inconsistency
 

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  1. POExpect Output inconsistency
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    <p>I want to automate the following interaction using Tcl/expect</p> <pre><code>[root@mgmt NAS]# ssh -q -p 8022 -l user 10.1.1.1 Password: HP Network Automation Version 9.10.02 Type "HELP connect" to see how to connect to a device. Type "HELP" to view a list of available commands. NA&gt;connect 10.1.1.2 WARNING: You do not have an approved reservation for this device at this time. Attempting to connect to device bigip1.network.company.net (10.1.1.2). Last login: Wed Sep 26 08:11:42 2012 from 10.2.1.1 Last login: Wed Sep 26 08:11:42 2012 from 10.2.1.1 [root@bigip1:Standby] config # [root@bigip1:Standby] config # [root@bigip1:Standby] config # [root@bigip1:Standby] config # uname -a Linux bigip1.network.company.net 2.6.18-164.11.1.el5.1.0.f5app #1 SMP Thu Apr 8 18:26:58 PDT 2010 i686 i686 i386 GNU/Linux [root@bigip1:Standby] config # exit logout Disconnected from device bigip1.network.company.net (10.1.1.2). NA&gt;quit Logging out of the NA Proxy Interface. &lt;Blank Line: couldn't show it with simple formatting&gt; </code></pre> <p>The user input is essentially:</p> <pre><code>password connect 10.1.1.2 uname -a exit quit </code></pre> <p>The script I wrote out, <code>connect.exp</code>, is as follows:</p> <pre><code>#!/usr/local/bin/expect # Set the input parameters set nashost [lindex $argv 0] set port [lindex $argv 1] set user [lindex $argv 2] set passw [lindex $argv 3] set device [lindex $argv 4] set cmd [lindex $argv 5] set binpath /usr/bin log_user 0 # Set timeout to 45 seconds set timeout 45 #check if all were provided if { $nashost == "" || $port == "" || $user == "" || $passw == "" || $device == "" || $cmd == "" } { puts "Usage: &lt;nashost&gt; &lt;port&gt; &lt;user&gt; &lt;passw&gt; &lt;device&gt; &lt;command&gt;\n" exit 1 } # String Variables set nasprompt "NA&gt;$" set prompt "config # $" # Flag Variables set running 1 set count 0 # SSH to specified NAS host if { [catch {spawn $binpath/ssh -q -p $port -o "StrictHostKeyChecking no" -l $user $nashost} error] } { puts "Spawn: SSH failed: $error" exit } expect { "assword: " { send "$passw\r" incr count if {$count &gt; 3} { puts "SSH failed on authentication after 3 tries" set running 0 } else { exp_continue } } -re "$nasprompt" { set running 1 } "Connection refused" { puts "$expect_out(buffer)" set running 0 } "Offending key" { puts "Host key verification failed." set running 0 } eof { puts -nonewline "Connection terminated unexpectedly:\n$expect_out(buffer)" set running 0 } timeout { puts "ssh: connect to NAS host $host: Connection timed out" set running 0 } } if {$running == 1} { send "connect $device\r" expect { -re "$nasprompt" { if {$running &gt; 0} { puts "connect to Device $device failed:\n$expect_out(buffer)" } send "quit\r" } -re "$prompt" { if {$running &gt; 0} { send "$cmd\r" set running 0 exp_continue } else { puts "$expect_out(buffer)" send "exit\r" } } full_buffer { puts "$expect_out(buffer)" exp_continue } eof { puts "ssh: Connection terminated unexpectedly during command execution: $host." } timeout { puts "ssh: Connection timed out during command execution: $host." } } } </code></pre> <p>The issue I face is that the output I get for this interaction with this script is inconsistent.</p> <p>I call the script as follows: <code>expect connect.exp 10.1.1.1 8022 user 'pwd' 10.1.1.2 'uname -a'</code></p> <p>Output one:</p> <pre><code>[root@bigip1:Standby] config # [root@bigip1:Standby] config # uname -a Linux bigip1.network.company.net 2.6.18-164.11.1.el5.1.0.f5app #1 SMP Thu Apr 8 18:26:58 PDT 2010 i686 i686 i386 GNU/Linux [root@bigip1:Standby] config # </code></pre> <p>Output two:</p> <pre><code>&lt;blank line&gt; &lt;blank line&gt; u[root@bigip1:Standby] config # [root@bigip1:Standby] config # </code></pre> <p>The <code>u</code> at the beginning of line 3 is part of the output, not a typo.</p> <p>Other variations of output two exist as well.</p> <p>The output I expected is: </p> <pre><code>Linux bigip1.network.company.net 2.6.18-164.11.1.el5.1.0.f5app #1 SMP Thu Apr 8 18:26:58 PDT 2010 i686 i686 i386 GNU/Linux [root@bigip1:Standby] config # </code></pre> <p>What am I doing incorrect in my script?</p>
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