Yes, even though there has been much silence recently, this blog is still alive and kicking.  I’ve been spending all my time working on Peach 2.3 and related things.

The Contract Killer film The first beta of Peach 2.3 should hit sourceforge this week, it’s currently undergoing it’s first major rollout for testing.  With the new I’ll be posting up a number of what’s new how too’s.

Also look for a series of "Advanced Peach" articles that will cover some of the advanced uses of Peach for complex file types and network protocols.

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Working from coffee shops has been a source of hate and discontent in my life for some time.  After finally getting a spot on some small table I find the internet connection is fully saturated by hipsters logged into MySpace.  VPN?  Hell NO!  Arrg!  Waist of time.  Back to the house it is, no social interaction for me today.  Entering from stage left is a new hspda laptop card.  I’m not convinced it will do much for me, when has the cell network ever been fast.  Rumors of speed form Asia are just that to me.  Hrmm… connected… speed test… BINGO!  Doing over 700 down, 200 up with 3 (of 5) bars, rocking the vpn, sharing my connection out to friends, and generally happy with life in the coffee shop again.

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Peach 2.0 development is rocking, here is a quick look at Peach Builder, a GUI for creating Peach 2.0 DDL files.  Peach builder will make fuzzer development much easier and faster.

Welcome to the first advanced Peach article.  In this series I’ll be covering a number of more advanced Peach concepts, tips, and tricks.

Today we are going to talk about relative offset relationships.  It’s not uncommon to find file formats that contain offsets to other parts of the file.  Two examples of this are: OpenType font files (TTF), and ZIP files.  Both formats contain offsets to additional structures in the file.  In the case of TTF most of these offsets are relative to other portions of the file.  By default Peach relationships are relative to the start of the data stream, however it’s easy to change this for relative offsets.

Lets start out with a basic example that contains a Header, some Data in the body, and has an Index located at the very end of the file.  This is the most basic example, and as you would guess it looks something like the following:

<DataModel name="RelativeOffsets">
    <Block name="Header">
        <Number name="DataLength">
            <Relative type="size" of="Data" />
        </Number>

        <Number name="IndexOffset">
            <Relative type="offset" of="Index" />
        </Number>
    </Block>

    <Blob name="Data" />

    <Block name="Index">
        <Number name="CountOfStrings">
            <Relative type="count" of="Strings" />
        </Number>
        <String name="Strings" nullTerminated="true" minOccures="1" maxOccures="1024" />
    </Block>
</DataModel>

Now, the value of IndexOffset is going to be relative to the start of the data consumed or produced by this data model.  However what if the specification said that IndexOffset’s value was relative to the position of IndexOffset?  In that case we would set the relative attribute to true like this:

<DataModel name=”RelativeOffsets”>
    <Block name=”Header”>
        <Number name=”DataLength”>
            <Relative type=”size” of=”Data” />
        </Number>
        <Number name=”IndexOffset”>
            <Relative type=”offset” of=”Index” relative=”true” />
        </Number>
    </Block>
    <Blob name=”Data” />
    <Block name=”Index”>
        <Number name=”CountOfStrings”>
            <Relative type=”count” of=”Strings” />
        </Number>
        <String name=”Strings” nullTerminated=”true” minOccures=”1″ maxOccures=”1024″ />
    </Block>
</DataModel>

Lets take it one set further and say we are instead relative to the end of Header.  In that case we could use the relativeTo attribute to specify which element, note however that we will not use Header but instead Data!  Why? Because the value specified in relativeTo will be relative to the beginning of that element, not the end.

<DataModel name=”RelativeOffsets”>
    <Block name=”Header”>
        <Number name=”DataLength”>
            <Relative type=”size” of=”Data” />
        </Number>
        <Number name=”IndexOffset”>
            <Relative type=”offset” of=”Index” relative=”true” relativeTo=”Data” />
        </Number>
    </Block>
    <Blob name=”Data” />
    <Block name=”Index”>
        <Number name=”CountOfStrings”>
            <Relative type=”count” of=”Strings” />
        </Number>
        <String name=”Strings” nullTerminated=”true” minOccures=”1″ maxOccures=”1024″ />
    </Block>
</DataModel>

Hey, that wasn’t so hard!!