From: Rodrigo Bermejo <rodrigo.bermejo@...>
Date: 2009-09-10T22:49:17+09:00
Subject: Re: Net::Telnet login() intercept authentication error

born in USSR wrote:
> CODE:
>>user_login='user1'
>>user_paswd='xxxxxx'
>>...
>>tserv = Net::Telnet::new("Host" => "192.168.1.5",
>>"Timeout" => 1, "Prompt" => /[$%#>] \z/n)
>>
>>  begin
>>     ans=tserv.login(user_login,user_paswd)
>>  rescue => err
>>     puts err
>>  end    
>>
>>puts ans
>>...
> 
> if user_login or user_paswd is wrong the application is hanging (don't
> know how it is on english, i mean that application stops). How can i
> intercept error.
> 
> http://www.ruby-doc.org tells that 'The method returns all data received
> during the login process from the host, including the echoed username
> but not the password (which the host should not echo). If a block is
> passed in, this received data is also yielded to the block as it is
> received. ', but nothing about wrong authentication.



Not all exceptions are created the same way

If the exception is a parent of StandardError, you will catch it
with a simple rescue , for other kind of exception this does not apply


begin
  tserv = Net::Telnet::new("Host" => "192.168.1.5", "Timeout" => 5, 
"Prompt" => /[$%#>] \z/n)
  ans=tserv.login(user_login,user_paswd)
rescue TimeoutError => e
  ans="Error while connecting: #{e}"
end

puts ans

-ronnie
-- 
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