2 * Definitions for packet disassembly structures and routines
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
28 #include "wiretap/wtap.h"
33 #include "value_string.h"
34 #include "column_info.h"
35 #include "frame_data.h"
36 #include "packet_info.h"
37 #include "column-utils.h"
40 #include "ws_symbol_export.h"
44 #endif /* __cplusplus */
46 #define hi_nibble(b) (((b) & 0xf0) >> 4)
47 #define lo_nibble(b) ((b) & 0x0f)
49 /* Useful when you have an array whose size you can tell at compile-time */
50 #define array_length(x) (sizeof x / sizeof x[0])
52 /* Check whether the "len" bytes of data starting at "offset" is
53 * entirely inside the captured data for this packet. */
54 #define BYTES_ARE_IN_FRAME(offset, captured_len, len) \
55 ((guint)(offset) + (guint)(len) > (guint)(offset) && \
56 (guint)(offset) + (guint)(len) <= (guint)(captured_len))
58 /* To pass one of two strings, singular or plural */
59 #define plurality(d,s,p) ((d) == 1 ? (s) : (p))
61 typedef struct _packet_counts {
78 /** Number of packet counts. */
79 #define PACKET_COUNTS_SIZE sizeof(packet_counts) / sizeof (gint)
81 extern void packet_init(void);
82 extern void packet_cleanup(void);
84 /* Handle for dissectors you call directly or register with "dissector_add_uint()".
85 This handle is opaque outside of "packet.c". */
86 struct dissector_handle;
87 typedef struct dissector_handle *dissector_handle_t;
89 /* Hash table for matching unsigned integers, or strings, and dissectors;
90 this is opaque outside of "packet.c". */
91 struct dissector_table;
92 typedef struct dissector_table *dissector_table_t;
95 * Dissector that returns nothing.
97 typedef void (*dissector_t)(tvbuff_t *, packet_info *, proto_tree *);
100 * Dissector that returns:
102 * The amount of data in the protocol's PDU, if it was able to
103 * dissect all the data;
105 * 0, if the tvbuff doesn't contain a PDU for that protocol;
107 * The negative of the amount of additional data needed, if
108 * we need more data (e.g., from subsequent TCP segments) to
109 * dissect the entire PDU.
111 typedef int (*new_dissector_t)(tvbuff_t *, packet_info *, proto_tree *, void *);
113 /** Type of a heuristic dissector, used in heur_dissector_add().
115 * @param tvb the tv_buff with the (remaining) packet data
116 * @param pinfo the packet info of this packet (additional info)
117 * @param tree the protocol tree to be build or NULL
118 * @return TRUE if the packet was recognized by the sub-dissector (stop dissection here)
120 typedef gboolean (*heur_dissector_t)(tvbuff_t *tvb, packet_info *pinfo,
121 proto_tree *tree, void *);
123 typedef void (*DATFunc) (const gchar *table_name, ftenum_t selector_type,
124 gpointer key, gpointer value, gpointer user_data);
125 typedef void (*DATFunc_handle) (const gchar *table_name, gpointer value,
127 typedef void (*DATFunc_table) (const gchar *table_name, const gchar *ui_name,
130 typedef void (*DATFunc_heur_table) (const gchar *table_name,gpointer table,
133 /* Opaque structure - provides type checking but no access to components */
134 typedef struct dtbl_entry dtbl_entry_t;
136 WS_DLL_PUBLIC dissector_handle_t dtbl_entry_get_handle (dtbl_entry_t *dtbl_entry);
137 WS_DLL_PUBLIC dissector_handle_t dtbl_entry_get_initial_handle (dtbl_entry_t * entry);
138 void dissector_table_foreach_changed (const char *name, DATFunc func,
140 WS_DLL_PUBLIC void dissector_table_foreach (const char *name, DATFunc func,
142 WS_DLL_PUBLIC void dissector_all_tables_foreach_changed (DATFunc func,
144 WS_DLL_PUBLIC void dissector_table_foreach_handle(const char *name, DATFunc_handle func,
146 WS_DLL_PUBLIC void dissector_all_tables_foreach_table (DATFunc_table func,
147 gpointer user_data, GCompareFunc compare_key_func);
149 /* a protocol uses the function to register a sub-dissector table */
150 WS_DLL_PUBLIC dissector_table_t register_dissector_table(const char *name,
151 const char *ui_name, const ftenum_t type, const int base);
153 /* Find a dissector table by table name. */
154 WS_DLL_PUBLIC dissector_table_t find_dissector_table(const char *name);
156 /* Get the UI name for a sub-dissector table, given its internal name */
157 WS_DLL_PUBLIC const char *get_dissector_table_ui_name(const char *name);
159 /* Get the field type for values of the selector for a dissector table,
160 given the table's internal name */
161 WS_DLL_PUBLIC ftenum_t get_dissector_table_selector_type(const char *name);
163 /* Get the base to use when displaying values of the selector for a
164 sub-dissector table, given the table's internal name */
165 WS_DLL_PUBLIC int get_dissector_table_base(const char *name);
167 /* Add an entry to a uint dissector table. */
168 WS_DLL_PUBLIC void dissector_add_uint(const char *abbrev, const guint32 pattern,
169 dissector_handle_t handle);
171 /* Delete the entry for a dissector in a uint dissector table
172 with a particular pattern. */
173 WS_DLL_PUBLIC void dissector_delete_uint(const char *name, const guint32 pattern,
174 dissector_handle_t handle);
176 /* Change the entry for a dissector in a uint dissector table
177 with a particular pattern to use a new dissector handle. */
178 WS_DLL_PUBLIC void dissector_change_uint(const char *abbrev, const guint32 pattern,
179 dissector_handle_t handle);
181 /* Reset an entry in a uint dissector table to its initial value. */
182 WS_DLL_PUBLIC void dissector_reset_uint(const char *name, const guint32 pattern);
184 /* Look for a given value in a given uint dissector table and, if found,
185 call the dissector with the arguments supplied, and return TRUE,
186 otherwise return FALSE. */
187 WS_DLL_PUBLIC gboolean dissector_try_uint(dissector_table_t sub_dissectors,
188 const guint32 uint_val, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
190 /* Look for a given value in a given uint dissector table and, if found,
191 call the dissector with the arguments supplied, and return TRUE,
192 otherwise return FALSE. */
193 gboolean dissector_try_uint_new(dissector_table_t sub_dissectors,
194 const guint32 uint_val, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, const gboolean add_proto_name, void *data);
196 /* Look for a given value in a given uint dissector table and, if found,
197 return the dissector handle for that value. */
198 WS_DLL_PUBLIC dissector_handle_t dissector_get_uint_handle(
199 dissector_table_t const sub_dissectors, const guint32 uint_val);
201 /* Add an entry to a string dissector table. */
202 WS_DLL_PUBLIC void dissector_add_string(const char *name, const gchar *pattern,
203 dissector_handle_t handle);
205 /* Delete the entry for a dissector in a string dissector table
206 with a particular pattern. */
207 WS_DLL_PUBLIC void dissector_delete_string(const char *name, const gchar *pattern,
208 dissector_handle_t handle);
210 /* Change the entry for a dissector in a string dissector table
211 with a particular pattern to use a new dissector handle. */
212 WS_DLL_PUBLIC void dissector_change_string(const char *name, const gchar *pattern,
213 dissector_handle_t handle);
215 /* Reset an entry in a string sub-dissector table to its initial value. */
216 WS_DLL_PUBLIC void dissector_reset_string(const char *name, const gchar *pattern);
218 /* Look for a given string in a given dissector table and, if found, call
219 the dissector with the arguments supplied, and return TRUE, otherwise
221 WS_DLL_PUBLIC gboolean dissector_try_string(dissector_table_t sub_dissectors,
222 const gchar *string, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
224 /* Look for a given value in a given string dissector table and, if found,
225 return the dissector handle for that value. */
226 WS_DLL_PUBLIC dissector_handle_t dissector_get_string_handle(
227 dissector_table_t sub_dissectors, const gchar *string);
229 /* Add a handle to the list of handles that *could* be used with this
230 table. That list is used by code in the UI. */
231 WS_DLL_PUBLIC void dissector_add_handle(const char *name, dissector_handle_t handle);
233 /* List of "heuristic" dissectors (which get handed a packet, look at it,
234 and either recognize it as being for their protocol, dissect it, and
235 return TRUE, or don't recognize it and return FALSE) to be called
236 by another dissector. */
237 typedef GSList *heur_dissector_list_t;
241 heur_dissector_t dissector;
242 protocol_t *protocol;
246 /** A protocol uses this function to register a heuristic sub-dissector list.
247 * Call this in the parent dissectors proto_register function.
249 * @param name the name of this protocol
250 * @param list the list of heuristic sub-dissectors to be registered
252 WS_DLL_PUBLIC void register_heur_dissector_list(const char *name,
253 heur_dissector_list_t *list);
255 WS_DLL_PUBLIC void dissector_all_heur_tables_foreach_table (DATFunc_heur_table func,
258 /** Try all the dissectors in a given heuristic dissector list. This is done,
259 * until we find one that recognizes the protocol.
260 * Call this while the parent dissector running.
262 * @param sub_dissectors the sub-dissector list
263 * @param tvb the tv_buff with the (remaining) packet data
264 * @param pinfo the packet info of this packet (additional info)
265 * @param tree the protocol tree to be build or NULL
266 * @param data parameter to pass to subdissector
267 * @return TRUE if the packet was recognized by the sub-dissector (stop dissection here)
269 WS_DLL_PUBLIC gboolean dissector_try_heuristic(heur_dissector_list_t sub_dissectors,
270 tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data);
272 /** Add a sub-dissector to a heuristic dissector list.
273 * Call this in the proto_handoff function of the sub-dissector.
275 * @param name the name of the "parent" protocol, e.g. "tcp"
276 * @param dissector the sub-dissector to be registered
277 * @param proto the protocol id of the sub-dissector
279 WS_DLL_PUBLIC void heur_dissector_add(const char *name, heur_dissector_t dissector,
282 /** Remove a sub-dissector from a heuristic dissector list.
283 * Call this in the prefs_reinit function of the sub-dissector.
285 * @param name the name of the "parent" protocol, e.g. "tcp"
286 * @param dissector the sub-dissector to be unregistered
287 * @param proto the protocol id of the sub-dissector
289 WS_DLL_PUBLIC void heur_dissector_delete(const char *name, heur_dissector_t dissector, const int proto);
291 /** Enable/Disable a sub-dissector in a heuristic dissector list
292 * Call this in the prefs_reinit function of the sub-dissector.
294 * @param name the name of the "parent" protocol, e.g. "tcp"
295 * @param dissector the sub-dissector to be disabled/enabled
296 * @param proto the protocol id of the sub-dissector
297 * @param TRUE/FALSE to enable/disable the sub-dissector
299 extern void heur_dissector_set_enabled(const char *name, heur_dissector_t dissector, const int proto, const gboolean enabled);
301 /* Register a dissector. */
302 WS_DLL_PUBLIC void register_dissector(const char *name, dissector_t dissector,
304 WS_DLL_PUBLIC void new_register_dissector(const char *name, new_dissector_t dissector,
307 /* Get the long name of the protocol for a dissector handle. */
308 extern const char *dissector_handle_get_long_name(const dissector_handle_t handle);
310 /* Get the short name of the protocol for a dissector handle. */
311 WS_DLL_PUBLIC const char *dissector_handle_get_short_name(const dissector_handle_t handle);
313 /* Get the index of the protocol for a dissector handle. */
314 WS_DLL_PUBLIC int dissector_handle_get_protocol_index(const dissector_handle_t handle);
316 /* Find a dissector by name. */
317 WS_DLL_PUBLIC dissector_handle_t find_dissector(const char *name);
319 /* Create an anonymous handle for a dissector. */
320 WS_DLL_PUBLIC dissector_handle_t create_dissector_handle(dissector_t dissector,
322 WS_DLL_PUBLIC dissector_handle_t new_create_dissector_handle(new_dissector_t dissector,
325 /* Call a dissector through a handle and if no dissector was found
326 * pass it over to the "data" dissector instead.
328 * @param handle The dissector to call.
329 * @param tvb The buffer to dissect.
330 * @param pinfo Packet Info.
331 * @param tree The protocol tree.
332 * @param data parameter to pass to dissector
333 * @return If the protocol for that handle isn't enabled call the data
334 * dissector. Otherwise, if the handle refers to a new-style
335 * dissector, call the dissector and return its return value, otherwise call
336 * it and return the length of the tvbuff pointed to by the argument.
338 WS_DLL_PUBLIC int call_dissector_with_data(dissector_handle_t handle, tvbuff_t *tvb,
339 packet_info *pinfo, proto_tree *tree, void *data);
340 WS_DLL_PUBLIC int call_dissector(dissector_handle_t handle, tvbuff_t *tvb,
341 packet_info *pinfo, proto_tree *tree);
343 /* Call a dissector through a handle but if no dissector was found
344 * just return 0 and do not call the "data" dissector instead.
346 * @param handle The dissector to call.
347 * @param tvb The buffer to dissect.
348 * @param pinfo Packet Info.
349 * @param tree The protocol tree.
350 * @param data parameter to pass to dissector
351 * @return If the protocol for that handle isn't enabled, return 0 without
352 * calling the dissector. Otherwise, if the handle refers to a new-style
353 * dissector, call the dissector and return its return value, otherwise call
354 * it and return the length of the tvbuff pointed to by the argument.
356 WS_DLL_PUBLIC int call_dissector_only(dissector_handle_t handle, tvbuff_t *tvb,
357 packet_info *pinfo, proto_tree *tree, void *data);
359 /* Do all one-time initialization. */
360 extern void dissect_init(void);
362 extern void dissect_cleanup(void);
365 * Given a tvbuff, and a length from a packet header, adjust the length
366 * of the tvbuff to reflect the specified length.
368 WS_DLL_PUBLIC void set_actual_length(tvbuff_t *tvb, const guint specified_len);
370 /* Allow protocols to register "init" routines, which are called before
371 we make a pass through a capture file and dissect all its packets
372 (e.g., when we read in a new capture file, or run a "filter packets"
373 or "colorize packets" pass over the current capture file). */
374 WS_DLL_PUBLIC void register_init_routine(void (*func)(void));
376 /* Initialize all data structures used for dissection. */
377 WS_DLL_PUBLIC void init_dissection(void);
379 /* Free data structures allocated for dissection. */
380 WS_DLL_PUBLIC void cleanup_dissection(void);
382 /* Allow protocols to register a "cleanup" routine to be
383 * run after the initial sequential run through the packets.
384 * Note that the file can still be open after this; this is not
385 * the final cleanup. */
386 WS_DLL_PUBLIC void register_postseq_cleanup_routine(void (*func)(void));
388 /* Call all the registered "postseq_cleanup" routines. */
389 WS_DLL_PUBLIC void postseq_cleanup_all_protocols(void);
391 /* Allow dissectors to register a "final_registration" routine
392 * that is run like the proto_register_XXX() routine, but the end
393 * end of the epan_init() function; that is, *after* all other
394 * subsystems, liked dfilters, have finished initializing. This is
395 * useful for dissector registration routines which need to compile
396 * display filters. dfilters can't initialize itself until all protocols
397 * have registereed themselvs. */
399 register_final_registration_routine(void (*func)(void));
401 /* Call all the registered "final_registration" routines. */
403 final_registration_all_protocols(void);
406 * Add a new data source to the list of data sources for a frame, given
407 * the tvbuff for the data source and its name.
409 WS_DLL_PUBLIC void add_new_data_source(packet_info *pinfo, tvbuff_t *tvb,
414 * Return the data source name, tvb.
417 WS_DLL_PUBLIC const char *get_data_source_name(const struct data_source *src);
418 WS_DLL_PUBLIC tvbuff_t *get_data_source_tvb(const struct data_source *src);
421 * Free up a frame's list of data sources.
423 extern void free_data_sources(packet_info *pinfo);
425 /* Mark another frame as depended upon by the current frame.
427 * This information is used to ensure that the dependend-upon frame is saved
428 * if the user does a File->Save-As of only the Displayed packets and the
429 * current frame passed the display filter.
431 WS_DLL_PUBLIC void mark_frame_as_depended_upon(packet_info *pinfo, guint32 frame_num);
434 * Dissectors should never modify the packet data.
436 extern void dissect_packet(epan_dissect_t *edt,
437 struct wtap_pkthdr *phdr, const guchar *pd,
438 frame_data *fd, column_info *cinfo);
440 /* These functions are in packet-ethertype.c */
441 extern void capture_ethertype(guint16 etype, const guchar *pd, int offset,
442 int len, packet_counts *ld);
443 WS_DLL_PUBLIC void ethertype(guint16 etype, tvbuff_t *tvb, int offset_after_ethertype,
444 packet_info *pinfo, proto_tree *tree, proto_tree *fh_tree,
445 int etype_id, int trailer_id, int fcs_len);
448 * Dump layer/selector/dissector records in a fashion similar to the
449 * proto_registrar_dump_* routines.
451 WS_DLL_PUBLIC void dissector_dump_decodes(void);
454 * For each heuristic dissector table, dump list of dissectors (filter_names) for that table
456 WS_DLL_PUBLIC void dissector_dump_heur_decodes(void);
459 * post dissectors are to be called by packet-frame.c after every other
460 * dissector has been called.
462 WS_DLL_PUBLIC void register_postdissector(dissector_handle_t);
463 extern gboolean have_postdissector(void);
464 extern void call_all_postdissectors(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
468 #endif /* __cplusplus */
470 #endif /* packet.h */