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WebSocket Keywords
==================
websocket.payload
-----------------
A sticky buffer on the unmasked payload,
limited by suricata.yaml config value ``websocket.max-payload-size``.
Examples::
websocket.payload; pcre:"/^123[0-9]*/";
websocket.payload content:"swordfish";
``websocket.payload`` is a 'sticky buffer' and can be used as ``fast_pattern``.
websocket.flags
---------------
Matches on the websocket flags.
It uses a 8-bit unsigned integer as value.
Only the four upper bits are used.
The value can also be a list of strings (comma-separated),
where each string is the name of a specific bit like `fin` and `comp`,
and can be prefixed by `!` for negation.
websocket.flags uses an :ref:`unsigned 8-bits integer <rules-integer-keywords>`
Examples::
websocket.flags:128;
websocket.flags:&0x40=0x40;
websocket.flags:fin,!comp;
websocket.mask
--------------
Matches on the websocket mask if any.
It uses a 32-bit unsigned integer as value (big-endian).
websocket.mask uses an :ref:`unsigned 32-bits integer <rules-integer-keywords>`
Examples::
websocket.mask:123456;
websocket.mask:>0;
websocket.opcode
----------------
Matches on the websocket opcode.
It uses a 8-bit unsigned integer as value.
Only 16 values are relevant.
It can also be specified by text from the enumeration
websocket.opcode uses an :ref:`unsigned 8-bits integer <rules-integer-keywords>`
Examples::
websocket.opcode:1;
websocket.opcode:>8;
websocket.opcode:ping;
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