telnetting cisco routers/devices

[Peña, Botp]

Hi ruby telnet gurus,

I'm having difficulty telnetting properly cisco devices. I googled the net
and found http://nettelnetcisco.sourceforge.net/docs.html. But this is perl.
Any kind soul doing something like this in ruby and would love to share?

Thanks in advance -botp

 

[jm]

Just a dumb question to begin with - what have you tried? Net::Telnet?=20=

Have you tried ruby's expect? (Had forgotten about this until I was=20
flipping through pickaxe 2 today for something else).

J.

Hi ruby telnet gurus,

I'm having difficulty telnetting properly cisco devices. I googled the=20=

 

[Ghislain Mary]

Hi,

Here is what I did to access some information on a Cisco Access Point
using telnet:


require 'net/telnet'


=begin rdoc
This class consists of using a telnet connection to get some information
from a Cisco Access Point.

It has the ability to get some information about the STAs associations,
some global statistics about the wireless interface of the AP, some
statistics per QoS priority, and some statistics per STA.
=end
class CiscoAP

# The parameters of the AP about QoS: CWMin, CWMax, TXOP...
attr_reader :qos_params

# Create a new CiscoAP instance.
def initialize(host, login, password)
@host, @login, @password = host, login, password
connect
@qos_params = qos_information
end

# Close the connection to the telnet server.
def close
@connection.close
end

# Clear all the statistics.
def clear_all_stats
clear_global_stats
clear_interface_stats
end

# Clear the global statistics about the Dot11Radio 0 interface.
def clear_global_stats
telnet_exec('clear dot11 statistics Dot11Radio 0')

true
end

# Clear the interface statistics about the Dot11Radio 0 interface.
def clear_interface_stats
telnet_exec('clear interface Dot11Radio 0')

true
end

# Get the global statistics about the Dot11Radio 0 interface.
def global_stats
telnet_exec('show interfaces Dot11Radio 0 statistics')
end

=begin rdoc
Get a Hash containing statistics for a particular STA knowing its
MAC address.

Output example:
{
:rts_retries => 0,
ackets_in => 76274,
:ip_address => "10.0.1.3",
ackets_out => 157063,
:state => "Assoc",
:bytes_in => 24183047,
:mac_address => "0040.96a6.802c",
:supported_rates => [6.0, 9.0, 18.0, 24.0, 36.0],
:bytes_out => 165501061,
:data_retries => 7604,
:signal_strength => -39,
:current_rate => 36.0
}
=end
def information_about_sta(mac_address)
result = telnet_exec(
"show dot11 associations #{to_cisco_mac_address mac_address }")

if result.size > 0
output = Hash.new
(md = result.match(/Address\s*:\s*(.{4}\..{4}\..{4})/)) &&
(output[:mac_address] = md[1])
(md = result.match(/IP Address\s*:\s*(\d+\.\d+\.\d+\.\d+)/)) &&
(output[:ip_address] = md[1])
(md = result.match(/State\s*:\s*(\w+)/)) && (output[:state] =
md[1])
(md = result.match(/Current Rate\s*:\s*(.*)?\s/)) &&
(output[:current_rate] = md[1].to_f)
(md = result.match(/Supported Rates\s*:\s*(.*)$/)) &&
(output[:supported_rates] = md[1].split.collect { |elem|
elem.to_f })
(md = result.match(/Signal Strength\s*:\s*(-\d+)\s/)) &&
(output[:signal_strength] = md[1].to_i)
(md = result.match(/Packets Input\s*:\s*(\d+)\s/)) &&
(output[ackets_in] = md[1].to_i)
(md = result.match(/Packets Output\s*:\s*(\d+)\s/)) &&
(output[ackets_out] = md[1].to_i)
(md = result.match(/Bytes Input\s*:\s*(\d+)\s/)) &&
(output[:bytes_in] = md[1].to_i)
(md = result.match(/Bytes Output\s*:\s*(\d+)\s/)) &&
(output[:bytes_out] = md[1].to_i)
(md = result.match(/Data Retries\s*:\s*(\d+)\s/)) &&
(output[:data_retries] = md[1].to_i)
(md = result.match(/RTS Retries\s*:\s*(\d+)\s/)) &&
(output[:rts_retries] = md[1].to_i)

output
end
end

=begin rdoc
Get QoS information about the AP: the values for CWmin, CWmax,
AIFSn and TXOP.

Output example:
{
:BACKGROUND => { :cwmin => 4,
:cwmax => 10,
:aifsn => 7,
:txop => 0 },
:VIDEO => { :cwmin => 3,
:cwmax => 4,
:aifsn => 2,
:txop => 3008 },
:BESTEFFORT => { :cwmin => 4,
:cwmax => 10,
:aifsn => 3,
:txop => 0 },
:VOICE => { :cwmin => 2,
:cwmax => 3,
:aifsn => 2,
:txop => 1504 }
}
=end
def qos_information
result = telnet_exec('show controllers | begin Configured Access
Class Parameters')
result = result.split("\n")[1..4].join("\n")

if result.size > 0
output = Hash.new
result.each_line do |line|
priority = line.match(/\s*(\w*)\s*:/)[1].upcase.to_sym
output[priority] = {
:cwmin => line.match(/cw-min\s+(\d+)/)[1].to_i,
:cwmax => line.match(/cw-max\s+(\d+)/)[1].to_i,
:aifsn => line.match(/fixed-slot\s+(\d+)/)[1].to_i,
:txop => line.match(/txop\s+(\d+)/)[1].to_i
}
end
end

output
end

private

# Connect to the telnet server.
def connect
@connection = Net::Telnet.new(
"Host" => @host,
"Timeout" => false,
"Prompt" => /.*\#/
) #{ |str| print str }
@connection.login({
"Name" => @login,
"Password" => @password,
"LoginPrompt" => /Username:/
}) #{ |str| print str }

# Unset the terminal length.
@connection.cmd('terminal length 0')
end

# Execute a set of telnet commands.
def telnet_exec(commands)
result = ''
commands = [commands] if commands.class != Array

# Execute each command.
commands.each do |command|
result += @connection.cmd(command)
end

# Clean the result a bit.
result.gsub!(/^.*#/, '')
commands.each do |command|
result.gsub!(/#{command}/, '')
end
result.gsub!(/(\n)+/, "\n")
result.gsub!(/\|\n/, '')
result.strip!

result
end

# Converts an ordinary MAC address to a Cisco MAC address.
# XX:XX:XX:XX:XX:XX => XXXX.XXXX.XXXX
def to_cisco_mac_address(mac_address)
mac_address =~ /(\w\w)\w\w)\w\w)\w\w)\w\w)\w\w)/
"#$1#$2.#$3#$4.#$5#$6"
end

end


Hope that helps.

Regards,

Ghislain