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binpac: Add FlowBuffer policy mechanisms

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This allows for tunability of the following behaviors:

* Minimum flowbuffer capacity to use when parsing a new unit

* Threshold at which flowbuffer capacity is contracted back to the
  minimum after parsing a complete unit and before parsing the next

* Maximum flowbuffer capacity to allow when parsing a given unit

Failed flowbuffer allocations due to reaching maximum capacity or any
other reason now throw ExceptionFlowBufferAlloc.
This commit is contained in:
Jon Siwek 2019-04-05 12:21:42 -07:00 • committed by Tim Wojtulewicz
parent 7e6e24a4d8
commit b4b229acf7
4 changed files with 73 additions and 13 deletions
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10
tools/binpac/lib/binpac_regex.h
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@ -13,7 +13,8 @@ namespace binpac
//
// Note, this must be declared/defined here, and inline, because the RE
// functionality can only be used when compiling from inside Bro.
inline void init();
// A copy is made of any FlowBuffer policy struct data passed.
inline void init(FlowBuffer::Policy* fbp = 0);
// Internal vector recording not yet compiled matchers.
extern std::vector<RE_Matcher*>* uncompiled_re_matchers;
@ -42,7 +43,7 @@ public:
}
private:
friend void ::binpac::init();
friend void ::binpac::init(FlowBuffer::Policy*);
// Function, and state, for compiling matchers.
static void init();
@ -68,9 +69,12 @@ inline void RegExMatcher::init()
uncompiled_re_matchers->clear();
}
inline void init()
inline void init(FlowBuffer::Policy* fbp)
{
RegExMatcher::init();
if ( fbp )
FlowBuffer::init(*fbp);
}
} // namespace binpac