[Snort-users] snort rule

can you help me
  to write rules regarding DHCP
  The rule is
  "detect all attempts to exploit this vulnerability. In particular, it should 
detect attempts by any computer making DHCP requests where hte Hlen field has 
an invalid value, and where the following byte-code sequence is found anywhere 
in the Sname or File fields. The byte-code sequence should not be matched in 
any other field of the request. The byte-code sequence (in hexadecimal) is:
  01 48 23 87 AB 1F FA 2C 9A 00 00 00 00 21 FF FF
   on detecction of such attack attempts, your rule should generate an alert 
with the message:
  "DHCP Service invalid input HLen attack detected".
   
  thanx

       
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