Move previously global table into detect engine ctx. Now that we
can register buffers at rule loading time we need to take concurrency
into account.
Move DetectBufferType to detect.h and update DetectBufferCtx API calls
to include a detect engine ctx reference.
Introduce InspectionBuffer a structure for passing data between
prefilters, transforms and inspection engines.
At rule parsing time, we'll register new unique 'DetectBufferType's
for a 'parent' buffer (e.g. pure file_data) with its transformations.
Each unique combination of buffer with transformations gets it's
own buffer id.
Similarly, mpm registration and inspect engine registration will be
copied from the 'parent' (again, e.g. pure file_data) to the new id's.
The transforms are called from within the prefilter engines themselves.
Provide generic MPM matching and setup callbacks. Can be used by
keywords to avoid needless code duplication. Supports transformations.
Use unique name for profiling, to distinguish between pure buffers
and buffers with transformation.
Add new registration calls for mpm/prefilters and inspect engines.
Inspect engine api v2: Pass engine to itself. Add generic engine that
uses GetData callback and other registered settings.
The generic engine should be usable for every 'simple' case where
there is just a single non-streaming buffer. For example HTTP uri.
The v2 API assumes that registered MPM implements transformations.
Add util func to set new transform in rule and add util funcs for rule
parsing.
Set flags by default:
-Wmissing-prototypes
-Wmissing-declarations
-Wstrict-prototypes
-Wwrite-strings
-Wcast-align
-Wbad-function-cast
-Wformat-security
-Wno-format-nonliteral
-Wmissing-format-attribute
-funsigned-char
Fix minor compiler warnings for these new flags on gcc and clang.
Now that detect moves the raw progress forward, it's important
to deal with the case where detect don't consider raw inspection.
If no 'stream' rules are active, disable raw. For this the disable
raw flag is now per stream.
The new Hyperscan 4.4 API provides a function to check for SSSE3
presence at runtime. This allows us to fall back to non-Hyperscan
matchers on systems without SSSE3 even when the suricata executable
is built with Hyperscan support. Addresses Redmine issue #2010.
Signed-off-by: Sascha Steinbiss <sascha@steinbiss.name>
Tested-by: Arturo Borrero Gonzalez <arturo@debian.org>
Register keywords globally at start up.
Create a map of the registery per detection engine. This we need because
the sgh_mpm_context value is set per detect engine.
Remove APP_MPMS_MAX.
Introduce prefilter keyword to force a keyword to be used as prefilter.
e.g.
alert tcp any any -> any any (content:"A"; flags:R; prefilter; sid:1;)
alert tcp any any -> any any (content:"A"; flags:R; sid:2;)
alert tcp any any -> any any (content:"A"; dsize:1; prefilter; sid:3;)
alert tcp any any -> any any (content:"A"; dsize:1; sid:4;)
In sid 2 and 4 the content keyword is used in the MPM engine.
In sid 1 and 3 the flags and dsize keywords will be used.