From: Dany Cayouette <danyc@...>
Date: 2004-09-04T07:45:19+09:00
Subject: Re: Bug in Net::Telnet ? [Newbie]

Sorry... something was not clear...  I will receive the name thing from the remote device, but it shows up on different lines in Dump_log (I suspect different packet on network but not sure)...  i.e.


< 0x00000: ff fe 1f ff  fe 18 ff fa  18 01 ff f0               ............

> 0x00000: ff fc 1f                                            ...

> 0x00000: ff fc 18                                            ...

< 0x00000: 61 64 6d ....


On Fri, 3 Sep 2004 18:25:30 -0400
Dany Cayouette <danyc@nortelnetworks.com> wrote:

> Greetings,
>   I'm a newbie at Ruby.  I think there might be a bug in Net::Telnet from 
> ruby 1.8.1.  
> 
> #ruby --version
> ruby 1.8.1 (2003-12-25) [sparc-solaris2.8]
> 
> 
> Looking at the output from Dump_log, sometimes the remote device will send telnet control sequence follow by some output
> 
> e.g.
> < 0x00000: ff fe 1f ff  fe 18 ff fa  18 01 ff f0  61 64 6d  ...
> 
> Then it works as expected, but sometimes I only get
> 
> ff fe 1f ff  fe 18 ff fa  18 01 ff f0
> 
> And in that scenario, I think waitfor and preprocess methods don't work correctly.
> 
> In waitfor, this seems to match
> 
> elsif pt = c.rindex(/#{IAC}[^#{IAC}#{AO}#{AYT}#{DM}#{IP}#{NOP}]?\z/n
> o)
>               buf = preprocess(c[0 ... pt])
>               rest = c[pt .. -1]
> 
> so we send only a partial telnet sub-option to preprocess
> ff fe 1f ff  fe 18 ff fa  18 01
> 
> and it looks like some telnet control character will be send back to the caller of waitfor.
> 
> I'm not sure that is the expected behavior, but since when the remote device send extra output with the same control sequence, I get different results...  I think it is not the intended behavior.
> 
> Can someone help me out and tell me the best way to 'fix it'  (I'm a newbie!!)
> 
> Thanks,
> Dany