todo

this is sample about DHCP-agent

[ Quite a bit! ]

Things that need to be done for RFC compliance:
   
-- allow options to be concantonated together (which
   extend over 255 octets)

   probably many more to come once the rest of the todos are
   complete. currently the client seems to be behaving properly.

major todos:

-- make dhcpclient relay agent friendly
   -- check rfcs for any catch 22s

-- write dhcpserver

-- write dhcpdiscover
   a scanner to output information on servers/relay agents
   responding

other todo:

-- rawnet_is_valid needs more checks.

   * actually this needs to be reviewed more carefully.
     we're currently using a lot of validity checks
     in many places which is good, but they should all be
     complete in their own domain. these domains need to be
     defined.

-- implement in inform the client.
   as per RFC2131

-- other minor optimizations which would be nice are noted in FIXMEs
   all over the code.

-- stringbuffer used in almost _all_ string operations except really simple ones.

-- document output from dhcpsniff -- especially how brief mode is layed out.

-- in dhcp-tokenizer use mmap() to implement nicer peeking.

-- find out why dnet is acting a little silly with aliased interfaces.

-- we're using bit (really byte) arrays to hold an option list in
   many places in the code where this is useful. it may be
   prudent to capsulate this as an object in its own right.

-- subnet mask must be first option if router option is set.

-- stringbuffer might be more useful it allowed marking of
   arbitrary characters with sentinels.

-- "do-measure-router-latency" and
   "client-do-discover-icmp-latency" seem to be misnamed. rename
   scheme routine to bring it in line with the user setting.

-- make the hostname option settable via the command line.