$ in banner; expect4r assumes prompt on ios

[bthornto]

Hey there-

First thanks for your work on this. It is proving to be very useful. It working fine on our lab but our production routers have a banner motd with a $ in it and it is parsed as a prompt and therefore the password never given:

debug: buf0: [,and may result in fines of $]
debug: match PROMPT
debug: ,and may result in fines of $
debug: print: "show ip route\r", io_writer: #File:0x007fcfe89a8ca0

The actual line of the banner is:

,and may result in fines of $250,000 and/or imprisonment.

Any thoughts?

Brad

[jeanmichel-gh]

Hi Brad,

Thanks for the feedback,
Have you looked at login method in CicoCommon module?
What the exact banner?

Jean-Michel

[bthornto]

This is the exact banner:

^
WARNING
Unauthorized access to this system is a violation of the
Federal Electronics Communications Privacy Act of 1986
,and may result in fines of $250,000 and/or imprisonment.
(Title 18, USC)
^Password:

I was going to modify that but I didn't want to hard code anything in the code. It's seems the $ is what is throwing it off. I'm also not able to change the banner on the entire population of devices.

Brad

[bthornto]

I have a temporary fix for myself, would you consider this change:

in ios.rb and iox.rb:

#remove $ as a prompt, since Cisco doesn't use it

def initialize(args)
super
@PS1 = /(.)(>|#)\s*$/
@more = / --More-- /
end

[bthornto]

A little more testing here. We have some interesting line in our configs and thus need a very specific regex for the prompt. (please excuse my rookie coding skills)

Here's some examples:

an ACL with a remark:

remark 1###########################################

an IPSLA with an 'owner'

owner User Name user@foo.com

Both seem to trigger a prompt find. So rather than hard code it (in ios.rb)

Allow the passing of a prompt:

def initialize(args)
super
if !args[1][:prompt].nil? then
@PS1 = args[1][:prompt]
else
@PS1 = /(.)(>|#)\s*$/
end
@more = / --More-- /
end

The reason for the \r in the regex is, nx-os appears to add a \r to the promt sometime (\rhostname#)

Brad

[jeanmichel-gh]

Removing the '$' char from the prompt seems a better approach.
For the remark issue, you will need to either customize the prompt regex to not match or change the remark value itself.