regular expression for MAC address validation


 
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# 22  
Old 11-08-2007
With bash, I use the following regexp:
Code:
egrep "^([0-9a-fA-F]{2}\:){5}[0-9a-fA-F]{2}$"

It's simpler than the one below and accepts capital letters as well.

Quote:
Originally Posted by hcclnoodles
OK this works perfectly (using egrep rather than sed)


Code:
#!/bin/ksh
echo enter mac
read mac
result=$( echo $mac | egrep ^[0-9a-f][0-9a-f]\:[0-9a-f][0-9a-f]\:[0-9a-f][0-9a-f]\:[0-9a-f][0-9a-f]\:[0-9a-f][0-9a-f]\:[0-9a-f][0-9a-f]$ )
if [ -z $result ]; then
  echo mac doesnt comply
else
echo mac is fine
fi

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MAC_NONE(4)						   BSD Kernel Interfaces Manual 					       MAC_NONE(4)

NAME
mac_none -- null MAC policy module SYNOPSIS
To compile the null policy into your kernel, place the following lines in your kernel configuration file: options MAC options MAC_NONE Alternately, to load the sample module at boot time, place the following line in your kernel configuration file: options MAC and in loader.conf(5): mac_none_load="YES" DESCRIPTION
The mac_none policy module implements a sample MAC policy that has no effect on access control in the system. Unlike mac_stub(4), none of the MAC entry points are defined. Label Format No labels are defined for mac_none. SEE ALSO
mac(4), mac_biba(4), mac_bsdextended(4), mac_ifoff(4), mac_lomac(4), mac_mls(4), mac_partition(4), mac_portacl(4), mac_seeotheruids(4), mac_stub(4), mac_test(4), mac(9) HISTORY
The mac_none policy module first appeared in FreeBSD 5.0 and was developed by the TrustedBSD Project. AUTHORS
This software was contributed to the FreeBSD Project by Network Associates Labs, the Security Research Division of Network Associates Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA CHATS research program. BUGS
See mac(9) concerning appropriateness for production use. The TrustedBSD MAC Framework is considered experimental in FreeBSD. While the MAC Framework design is intended to support the containment of the root user, not all attack channels are currently protected by entry point checks. As such, MAC Framework policies should not be relied on, in isolation, to protect against a malicious privileged user. BSD
December 1, 2002 BSD