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|
SIP Keywords
============
The SIP keywords are implemented as sticky buffers and can be used to match on fields in SIP messages.
============================== ==================
Keyword Direction
============================== ==================
sip.method Request
sip.uri Request
sip.request_line Request
sip.stat_code Response
sip.stat_msg Response
sip.response_line Response
sip.protocol Both
============================== ==================
sip.method
----------
This keyword matches on the method found in a SIP request.
Syntax
~~~~~~
::
sip.method; content:<method>;
Examples of methods are:
* INVITE
* BYE
* REGISTER
* CANCEL
* ACK
* OPTIONS
Examples
~~~~~~~~
::
sip.method; content:"INVITE";
sip.uri
-------
This keyword matches on the uri found in a SIP request.
Syntax
~~~~~~
::
sip.uri; content:<uri>;
Where <uri> is an uri that follows the SIP URI scheme.
Examples
~~~~~~~~
::
sip.uri; content:"sip:sip.url.org";
sip.request_line
----------------
This keyword forces the whole SIP request line to be inspected.
Syntax
~~~~~~
::
sip.request_line; content:<request_line>;
Where <request_line> is a partial or full line.
Examples
~~~~~~~~
::
sip.request_line; content:"REGISTER sip:sip.url.org SIP/2.0"
sip.stat_code
-------------
This keyword matches on the status code found in a SIP response.
Syntax
~~~~~~
::
sip.stat_code; content:<stat_code>
Where <status_code> belongs to one of the following groups of codes:
* 1xx - Provisional Responses
* 2xx - Successful Responses
* 3xx - Redirection Responses
* 4xx - Client Failure Responses
* 5xx - Server Failure Responses
* 6xx - Global Failure Responses
Examples
~~~~~~~~
::
sip.stat_code; content:"100";
sip.stat_msg
------------
This keyword matches on the status message found in a SIP response.
Syntax
~~~~~~
::
sip.stat_msg; content:<stat_msg>
Where <stat_msg> is a reason phrase associated to a status code.
Examples
~~~~~~~~
::
sip.stat_msg; content:"Trying";
sip.response_line
-----------------
This keyword forces the whole SIP response line to be inspected.
Syntax
~~~~~~
::
sip.response_line; content:<response_line>;
Where <response_line> is a partial or full line.
Examples
~~~~~~~~
::
sip.response_line; content:"SIP/2.0 100 OK"
sip.protocol
------------
This keyword matches the protocol field from a SIP request or response line.
If the response line is 'SIP/2.0 100 OK', then this buffer will contain 'SIP/2.0'
Syntax
~~~~~~
::
sip.protocol; content:<protocol>
Where <protocol> is the SIP protocol version.
Example
~~~~~~~
::
sip.protocol; content:"SIP/2.0"
|
