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# DHCP - Dynamic Host Configuration Protocol - RFC 1541
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# Pattern attributes: good veryfast fast
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# Protocol groups: networking ietf_draft_standard
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# Wiki: http://www.protocolinfo.org/wiki/DHCP
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#
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# Usually runs on ports 67 (server) and 68 (client)
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#
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# Also matches BOOTP (Bootstrap Protocol (RFC 951)) in the case that
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# the "vendor specific options" are used (these options were made standard
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# for DHCP).
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#
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# This pattern is lightly tested.
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dhcp
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^[\x01\x02][\x01- ]\x06.*c\x82sc
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# Let's break that down:
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#
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# (\x01|\x02) is for BOOTREQUEST or BOOTREPLY
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# Is there a demand for doing these seperately? The Packeteer does.
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#
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# [\x01-\x20] is for any of the hardware address types listed at
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# (http://www.iana.org/assignments/arp-parameters) and hopefully faster
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# ethernets too (100, 1000 and 10000mb) as well (do they share the 10mb
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# number?).
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#
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# \x06 for "hardware address length = 6 bytes". Does anyone use other lengths
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# these days? If so, this pattern won't match it as it stands.
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#
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# .* covers the hops, xid, secs, flags, ciaddr, yiaddr, siaddr, giaddr,
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# chaddr, sname and file fields. While this can't really be "any number
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# of characters" long, it doesn't seem worth it to count.
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# Can we make this more specific by restricting the number of hops or seconds?
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#
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# 0x63825363 is the "magic cookie" which begins the DHCP options field.
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