patch: Allow various ethernet address notations

[Arien Vijn <arien.vijn () ams-ix net>]

Greetings,

Attached is a small patch which makes libpcap filter expressions a bit  
more tolerant towards ethernet (MAC) address notations.

When troubleshooting network problems, me and my colleagues often want  
to cut-and-paste MAC addresses as displayed by network equipment.  
However, modern equipment show addresses in notations that are not  
accepted in libpcap filter expressions. Changing the notation each  
time is trivial but annoying. It seems unlikely that we are the only  
ones doing this. Therefore we would like to propose this patch.

With this patch the following notation forms are accepted as valid  
addresses:

        \1 xx:xx:xx:xx:xx:xx
        \2 xxxx.xxxx.xxxx
        \3 xx-xx-xx-xx-xx-xx
        \4 xx.xx.xx.xx.xx.xx
        \5 xxxxxxxxxxxx

\1 is the common notation; \2 is the Cisco-like notation, as used by  
many equipment vendors; \3 seems preferred by the IEEE and in many  
books. While testing this patch, I discovered that Debian applies a  
similar, independently developed, patch just to allow notations \4 and  
\5.

Please review this patch and consider it for some future release. If  
needed, I can make a patch for CVS HEAD. The same diff was uploaded to  
sourceforge.

Kind regards, Arien





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