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Convert MAC to hex howto

Started by	Johannes Graumann <johannes_graumann@web.de>
First post	2012-10-07 22:44 +0300
Last post	2012-10-07 23:38 +0300
Articles	3 — 2 participants

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  Convert MAC to hex howto Johannes Graumann <johannes_graumann@web.de> - 2012-10-07 22:44 +0300
    Re: Convert MAC to hex howto Paul Rubin <no.email@nospam.invalid> - 2012-10-07 12:56 -0700
      Re: Convert MAC to hex howto Johannes Graumann <johannes_graumann@web.de> - 2012-10-07 23:38 +0300

#30931 — Convert MAC to hex howto

From	Johannes Graumann <johannes_graumann@web.de>
Date	2012-10-07 22:44 +0300
Subject	Convert MAC to hex howto
Message-ID	<mailman.1931.1349639025.27098.python-list@python.org>

Dear all,

I'm trying to convert
	'00:08:9b:ce:f5:d4'
to 
	'\x00\x08\x9b\xce\xf5\xd4'
for use in magic packet construction for WakeOnLan like so:
	wolsocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
       	wolsocket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
	wolsocket.sendto('\xff'*6 + '\x00\x08\x9b\xce\xf5\xd4'*16,
	 (expectedlanbroadcast, 80))

This is what I came up whith, but I remain puzzled on how to preserver the 
leading '\h' ... thanks for any hint

expectedservermac = '00:08:9b:ce:f5:d4'
hexcall = str.split(expectedservermac,":")
hexcall.insert(0,'')
hexcall = "\\x".join(hexcall).decode('string_escape')

Thanks for any pointers.

Sincerely, Joh

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#30933

From	Paul Rubin <no.email@nospam.invalid>
Date	2012-10-07 12:56 -0700
Message-ID	<7xipamcazs.fsf@ruckus.brouhaha.com>
In reply to	#30931

Johannes Graumann <johannes_graumann@web.de> writes:
> 	'00:08:9b:ce:f5:d4'
> ...
> hexcall = "\\x".join(hexcall).decode('string_escape')

I think it's best not to mess with stuff like that.  Convert to integers
then convert back:

  mac = '00:08:9b:ce:f5:d4'
  hexcall = ''.join(chr(int(c,16)) for c in mac.split(':'))

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#30939

From	Johannes Graumann <johannes_graumann@web.de>
Date	2012-10-07 23:38 +0300
Message-ID	<mailman.1938.1349642407.27098.python-list@python.org>
In reply to	#30933

Paul Rubin wrote:

> Johannes Graumann <johannes_graumann@web.de> writes:
>> '00:08:9b:ce:f5:d4'
>> ...
>> hexcall = "\\x".join(hexcall).decode('string_escape')
> 
> I think it's best not to mess with stuff like that.  Convert to integers
> then convert back:
> 
>   mac = '00:08:9b:ce:f5:d4'
>   hexcall = ''.join(chr(int(c,16)) for c in mac.split(':'))

Thanks to you as well!

Joh

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Convert MAC to hex howto

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