Preprocessors

Each dynamic preprocessor must define the following items. These must be defined in the global scope of a source file (e.g. spp_example.c).

• const int MAJOR_VERSION

  This specifies the major version of the preprocessor.

• const int MINOR_VERSION

  This specifies the minor version of the preprocessor.

• const int BUILD_VERSION

  This specifies the build version of the preprocessor.

• const char *PREPROC_NAME

  This specifies the display name of the preprocessor.

• void DYNAMIC_PREPROC_SETUP(void)

  This function is called to register the preprocessor to be called with packets data.

The preprocessor must be built with the same macros defined as the Snort binary and linked with the dynamic preprocessor library that was created during the Snort build. A package configuration file is exported as part of the Snort build and can be accessed using the following commands with PKG_CONFIG_PATH=$<$snort build prefix/lib/pkgconfig$>$:

• pkg-config -cflags snort_preproc

  Returns the macros and include path needed to compile the dynamic preprocessor.

• pkg-config -libs snort_preproc

  Returns the library and library path needed to link the dynamic preprocessor.