Date: Sat, 27 Aug 2011 12:49:43 -0500 From: "JimF" <jfoug@....net> To: <john-dev@...ts.openwall.com> Subject: Re: #include "john.conf2" (a wish list item) From: "Solar Designer" <solar@...nwall.com> > > I think JimF's code is fine for jumbo (although I am relying on what was > said in here; I haven't tried the feature out yet), but just to provide > inspiration for possible enhancements (if we ever choose to implement > those), here are two other pieces of code with detection of infinite > recursion (loop). > It is likely that we will have to add some form of name storage, checking for the rules including rules code. So, if that is the case, it would be pretty easy to do the same thing for the .conf file including. NOTE, there is no need at all to implement this with super cool bells / whistles, or worry at all about it being made optimal. It is only done one time, at startup, so a very simplistic but rock solid method would be more than adequate. I think simply dropping names on a list, likely a static global to the config.c, and then check the list. If the name is already on the list, then skip that line, just like a comment. now, what is put ON the list does matter. So for the .conf's, I think we need full path. For the rules, I am not sure we have information on if they came from one .conf file, or another, so I think the name itself is all we can look up. One additional step I feel we need to do for rules, is to have a trivial rule elimination step, done after the rule is totally loaded. In this step, take the first rule, and search all lines of the rules for exactly the same line. If we find it, we remove any later instances. Then we take the next line, etc, etc. When done, we have all rules that are not 'exactly' the same removed. NOTE, there certainly can be identical rules still left, if there are thing in different order, or have something different. Az"abc" and $[a]$[b]$[c] and Az'abc' and $a$b$c (and many more) are exactly the same, but putting in logic smart enough to detect this, may be way beyond what we can easily do. However, if a rule include 6 rules, and each of them had Az"abc", then we can easily remove the last 5 of them. Jim.
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