Some examples from wiki caused parsing errors.
For example, "[1:80,![2,4]]" was treated as a mistake.
Also fixed loop detection in variables declaration. For example,
'A: "HOME_NET, !$HOME_NET"' resulted in parsing error.
Many rules have the same address vars, so instead of parsing them
each time use a hash to store the string and the parsed result.
Rules now reference the stored result in the hash table.
Suricata crashed when variable (either address or port)
referred to itself or if one created a looped chain of
variables. For instance:
HOME_NET: "!$EXTERNAL_NET"
EXTERNAL_NET: "!$HOME_NET"
Or:
Var1: "$Var2"
Var2: "$Var3"
Var3: "$Var1"