sending hexadecimal data via telnet

Looserette has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks,

I fear that's an easy question, but I just can't find the answer ... (maybe I'm not using the right words).

Here's a snippet of snoop output:

          64: 8d5b ffff 3131 3931 3031 3030 3030 3032    .[..119101000
+002
          80: 2e30 3130 3030 2020 2020 2020 2020 2020    .01000
[download]

=> I need to send that "0xffff" using Net::Telnet ... how can I do that ?

Thanks for your help !

Comment on sending hexadecimal data via telnet Download Code

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Re: sending hexadecimal data via telnet by tobyink (Canon) on Aug 07, 2012 at 13:16 UTC
`$telnet->put("\x{FF}\x{FF}");` [download] `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l]
Re: sending hexadecimal data via telnet by aitap (Curate) on Aug 07, 2012 at 13:25 UTC
Or use pack to transform arbitrary hexademical numbers into bytes. For example: `$ echo -n deadbeef \| perl -pe's/([[:xdigit:]]{2})/pack("H2",$1)/ge' \| +xxd 0000000: dead beef ....` [download] Sorry if my advice was wrong.	[reply] [d/l]
Re: sending hexadecimal data via telnet by thundergnat (Deacon) on Aug 07, 2012 at 19:07 UTC
"\xff" is the Telnet IAC (Interpret As Command) character. If you want to send an actual "\xff" character as data, you need to double it; "\xff\xff" Since it seems you want two "\xff" bytes in a row as data, you need to send 4 "\xff" bytes. See RFC854 pages 13-14.	[reply]