forked from osmocom/wireshark
![Stig Bjørlykke](/assets/img/avatar_default.png)
When fields have changed the compiled display filter may be invalid or need a recompile to be valid. Filters which are not valid after a recompile is set to a filter matching no packets (frame.number == 0) to indicate that this does no longer match anything. We should probably have a better filter matching no packet for this purpose. Change-Id: Id27efa9f46e77e20df50d7366f26d5cada186f93 Reviewed-on: https://code.wireshark.org/review/10123 Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>
267 lines
12 KiB
C
267 lines
12 KiB
C
/* tap.h
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* packet tap interface 2002 Ronnie Sahlberg
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __TAP_H__
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#define __TAP_H__
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#include <epan/epan.h>
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#include "ws_symbol_export.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef void (*tap_reset_cb)(void *tapdata);
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typedef gboolean (*tap_packet_cb)(void *tapdata, packet_info *pinfo, epan_dissect_t *edt, const void *data);
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typedef void (*tap_draw_cb)(void *tapdata);
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/**
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* Flags to indicate what a tap listener's packet routine requires.
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*/
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#define TL_REQUIRES_NOTHING 0x00000000 /**< nothing */
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#define TL_REQUIRES_PROTO_TREE 0x00000001 /**< full protocol tree */
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#define TL_REQUIRES_COLUMNS 0x00000002 /**< columns */
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#define TL_REQUIRES_ERROR_PACKETS 0x00000004 /**< include packet even if pinfo->flags.in_error_pkt is set */
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/** Flags to indicate what the tap listener does */
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#define TL_IS_DISSECTOR_HELPER 0x00000008 /**< tap helps a dissector do work
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** but does not, itself, require dissection */
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#ifdef HAVE_PLUGINS
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/** Register tap plugin type with the plugin system.
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Called by epan_register_plugin_types(); do not call it yourself. */
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extern void register_tap_plugin_type(void);
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#endif
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/*
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* For all tap plugins, call their register routines.
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* Must be called after init_plugins(), and must be called only once in
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* a program.
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*
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* XXX - should probably be handled by epan_init(), as the tap mechanism
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* is part of libwireshark.
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*/
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WS_DLL_PUBLIC void register_all_plugin_tap_listeners(void);
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extern void tap_init(void);
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/** This function registers that a dissector has the packet tap ability
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* available. The name parameter is the name of this tap and extensions can
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* use open_tap(char *name,... to specify that it wants to receive packets/
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* events from this tap.
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*
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* This function is only to be called once, when the dissector initializes.
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*
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* The return value from this call is later used as a parameter to the
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* tap_packet(unsigned int *tap_id,...
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* call so that the tap subsystem knows to which tap point this tapped
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* packet is associated.
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*/
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WS_DLL_PUBLIC int register_tap(const char *name);
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/* Gets a GList of the tap names */
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WS_DLL_PUBLIC GList* get_tap_names(void);
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/** This function will return the tap_id for the specific protocol tap
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* or 0 if no such tap was found.
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*/
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WS_DLL_PUBLIC int find_tap_id(const char *name);
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/** Everytime the dissector has finished dissecting a packet (and all
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* subdissectors have returned) and if the dissector has been made "tappable"
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* it will push some data to everyone tapping this layer by a call
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* to tap_queue_packet().
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* The first parameter is the tap_id returned by the register_tap()
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* call for this dissector (so the tap system can keep track of who it came
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* from and who is listening to it)
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* The second is the packet_info structure which many tap readers will find
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* interesting.
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* The third argument is specific to each tap point or NULL if no additional
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* data is available to this tap. A tap point in say IP will probably want to
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* push the IP header structure here. Same thing for TCP and ONCRPC.
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*
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* The pinfo and the specific pointer are what is supplied to every listener
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* in the read_callback() call made to every one currently listening to this
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* tap.
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*
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* The tap reader is responsible to know how to parse any structure pointed
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* to by the tap specific data pointer.
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*/
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WS_DLL_PUBLIC void tap_queue_packet(int tap_id, packet_info *pinfo, const void *tap_specific_data);
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/** Functions used by file.c to drive the tap subsystem */
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WS_DLL_PUBLIC void tap_build_interesting(epan_dissect_t *edt);
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/** This function is used to delete/initialize the tap queue and prime an
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* epan_dissect_t with all the filters for tap listeners.
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* To free the tap queue, we just prepend the used queue to the free queue.
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*/
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extern void tap_queue_init(epan_dissect_t *edt);
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/** this function is called after a packet has been fully dissected to push the tapped
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* data to all extensions that has callbacks registered.
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*/
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extern void tap_push_tapped_queue(epan_dissect_t *edt);
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/** This function is called after a packet has been fully dissected to push the tapped
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* data to all extensions that has callbacks registered.
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*/
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WS_DLL_PUBLIC void reset_tap_listeners(void);
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/** This function is called when we need to redraw all tap listeners, for example
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* when we open/start a new capture or if we need to rescan the packet list.
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* It should be called from a low priority thread say once every 3 seconds
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*
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* If draw_all is true, redraw all aplications regardless if they have
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* changed or not.
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*/
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WS_DLL_PUBLIC void draw_tap_listeners(gboolean draw_all);
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/** this function attaches the tap_listener to the named tap.
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* function returns :
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* NULL: ok.
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* non-NULL: error, return value points to GString containing error
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* message.
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* @param tapname The name of the tap we want to listen to.
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* @param tapdata is the instance identifier. The tap system uses the value of this
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* pointer to distinguish between different instances of a tap.
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* Just make sure that it is unique by letting it be the pointer to a struct
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* holding all state variables. If you want to allow multiple concurrent
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* instances, just put ALL state variables inside a struct allocated by
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* g_malloc() and use that pointer.
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* @param fstring is a pointer to a filter string.
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* If this is NULL, then the tap system will provide ALL packets passing the
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* tapped protocol to your listener.
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* If you specify a filter string here the tap system will first try
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* to apply this string to the packet and then only pass those packets that
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* matched the filter to your listener.
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* The syntax for the filter string is identical to normal display filters.
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*
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* NOTE: Specifying filter strings will have a significant performance impact
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* on your application and Wireshark. If possible it is MUCH better to take
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* unfiltered data and just filter it yourself in the packet-callback than
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* to specify a filter string.
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* ONLY use a filter string if no other option exist.
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*
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* @param flags is a set of flags for the tap listener. The flags that can be set are:
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*
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* TL_REQUIRES_PROTO_TREE
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*
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* set if your tap listener "packet" routine requires a protocol
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* tree to be built. It will require a protocol tree to be
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* built if either
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*
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* 1) it looks at the protocol tree in edt->tree
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*
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* or
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*
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* 2) the tap-specific data passed to it is constructed only if
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* the protocol tree is being built.
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*
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* TL_REQUIRES_COLUMNS
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*
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* set if your tap listener "packet" routine requires the column
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* strings to be constructed.
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*
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* If no flags are needed, use TL_REQUIRES_NOTHING.
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*
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* @param tap_reset void (*reset)(void *tapdata)
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* This callback is called whenever Wireshark wants to inform your
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* listener that it is about to start [re]reading a capture file or a new capture
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* from an interface and that your application should reset any state it has
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* in the *tapdata instance.
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* @param tap_packet gboolean (*packet)(void *tapdata, packet_info *pinfo, epan_dissect_t *edt, const void *data)
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* This callback is used whenever a new packet has arrived at the tap and that
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* it has passed the filter (if there were a filter).
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* The *data structure type is specific to each tap.
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* This function returns an gboolean and it should return
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* TRUE, if the data in the packet caused state to be updated
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* (and thus a redraw of the window would later be required)
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* FALSE, if we don't need to redraw the window.
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* NOTE: that (*packet) should be as fast and efficient as possible. Use this
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* function ONLY to store data for later and do the CPU-intensive processing
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* or GUI updates down in (*draw) instead.
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* @param tap_draw void (*draw)(void *tapdata)
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* This callback is used when Wireshark wants your application to redraw its
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* output. It will usually not be called unless your application has received
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* new data through the (*packet) callback.
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* On some ports of Wireshark (gtk2) (*draw) will be called asynchronously
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* from a separate thread up to once every 2-3 seconds.
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* On other ports it might only be called once when the capture is finished
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* or the file has been [re]read completely.
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*/
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WS_DLL_PUBLIC GString *register_tap_listener(const char *tapname, void *tapdata,
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const char *fstring, guint flags, tap_reset_cb tap_reset,
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tap_packet_cb tap_packet, tap_draw_cb tap_draw);
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/** This function sets a new dfilter to a tap listener */
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WS_DLL_PUBLIC GString *set_tap_dfilter(void *tapdata, const char *fstring);
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/** This function recompiles dfilter for all registered tap listeners */
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WS_DLL_PUBLIC void tap_listeners_dfilter_recompile(void);
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/** this function removes a tap listener */
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WS_DLL_PUBLIC void remove_tap_listener(void *tapdata);
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/**
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* Return TRUE if we have one or more tap listeners that require dissection,
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* FALSE otherwise.
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*/
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WS_DLL_PUBLIC gboolean tap_listeners_require_dissection(void);
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/** Returns TRUE there is an active tap listener for the specified tap id. */
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WS_DLL_PUBLIC gboolean have_tap_listener(int tap_id);
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/** Return TRUE if we have any tap listeners with filters, FALSE otherwise. */
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WS_DLL_PUBLIC gboolean have_filtering_tap_listeners(void);
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/**
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* Get the union of all the flags for all the tap listeners; that gives
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* an indication of whether the protocol tree, or the columns, are
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* required by any taps.
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*/
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WS_DLL_PUBLIC guint union_of_tap_listener_flags(void);
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/** This function can be used by a dissector to fetch any tapped data before
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* returning.
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* This can be useful if one wants to extract the data inside dissector BEFORE
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* it exists as an alternative to the callbacks that are all called AFTER the
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* dissection has completed.
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*
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* Example: SMB2 uses this mechanism to extract the data tapped from NTLMSSP
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* containing the account and domain names before exiting.
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* Note that the SMB2 tap listener specifies all three callbacks as NULL.
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*
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* Beware: when using this mechanism to extract the tapped data you can not
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* use "filters" and should specify the "filter" as NULL when registering
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* the tap listener.
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*/
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WS_DLL_PUBLIC const void *fetch_tapped_data(int tap_id, int idx);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __TAP_H__ */
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