2 * Definitions for packet disassembly structures and routines
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 * If <inttypes.h> defines formats to be used to print 64-bit integers,
32 #ifdef INTTYPES_H_DEFINES_FORMATS
36 #include "wiretap/wtap.h"
41 #include "value_string.h"
42 #include "column_info.h"
43 #include "frame_data.h"
44 #include "packet_info.h"
45 #include "column-utils.h"
48 #define hi_nibble(b) (((b) & 0xf0) >> 4)
49 #define lo_nibble(b) ((b) & 0x0f)
51 /* Useful when you have an array whose size you can tell at compile-time */
52 #define array_length(x) (sizeof x / sizeof x[0])
54 /* Check whether the "len" bytes of data starting at "offset" is
55 * entirely inside the captured data for this packet. */
56 #define BYTES_ARE_IN_FRAME(offset, captured_len, len) \
57 ((guint)(offset) + (guint)(len) > (guint)(offset) && \
58 (guint)(offset) + (guint)(len) <= (guint)(captured_len))
60 /* To pass one of two strings, singular or plural */
61 #define plurality(d,s,p) ((d) == 1 ? (s) : (p))
63 typedef struct _packet_counts {
78 /** Number of packet counts. */
79 #define PACKET_COUNTS_SIZE sizeof(packet_counts) / sizeof (gint)
81 /* Types of character encodings */
83 CHAR_ASCII = 0, /* ASCII */
84 CHAR_EBCDIC = 1 /* EBCDIC */
87 /* Struct for boolean enumerations */
88 typedef struct true_false_string {
94 * A default set of true/false strings that dissectors can use for
95 * FT_BOOLEAN header fields.
97 extern const true_false_string flags_set_truth;
99 extern void packet_init(void);
100 extern void packet_cleanup(void);
102 /* Handle for dissectors you call directly or register with "dissector_add()".
103 This handle is opaque outside of "packet.c". */
104 struct dissector_handle;
105 typedef struct dissector_handle *dissector_handle_t;
107 /* Hash table for matching port numbers and dissectors; this is opaque
108 outside of "packet.c". */
109 struct dissector_table;
110 typedef struct dissector_table *dissector_table_t;
113 * Dissector that returns nothing.
115 typedef void (*dissector_t)(tvbuff_t *, packet_info *, proto_tree *);
118 * Dissector that returns:
120 * the amount of data in the protocol's PDU, if it was able to
121 * dissect all the data;
123 * 0, if the tvbuff doesn't contain a PDU for that protocol;
125 * the negative of the amount of additional data needed, if
126 * we need more data (e.g., from subsequent TCP segments) to
127 * dissect the entire PDU.
129 typedef int (*new_dissector_t)(tvbuff_t *, packet_info *, proto_tree *);
131 typedef void (*DATFunc) (gchar *table_name, ftenum_t selector_type,
132 gpointer key, gpointer value, gpointer user_data);
133 typedef void (*DATFunc_handle) (gchar *table_name, gpointer value,
135 typedef void (*DATFunc_table) (gchar *table_name, gchar *ui_name,
138 /* Opaque structure - provides type checking but no access to components */
139 typedef struct dtbl_entry dtbl_entry_t;
141 extern dissector_handle_t dtbl_entry_get_handle (dtbl_entry_t *dtbl_entry);
142 extern dissector_handle_t dtbl_entry_get_initial_handle (dtbl_entry_t * entry);
143 extern void dissector_table_foreach_changed (char *name, DATFunc func,
145 extern void dissector_table_foreach (char *name, DATFunc func,
147 extern void dissector_all_tables_foreach_changed (DATFunc func,
149 extern void dissector_table_foreach_handle(char *name, DATFunc_handle func,
151 extern void dissector_all_tables_foreach_table (DATFunc_table func,
154 /* a protocol uses the function to register a sub-dissector table */
155 extern dissector_table_t register_dissector_table(const char *name,
156 char *ui_name, ftenum_t type, int base);
158 /* Find a dissector table by table name. */
159 extern dissector_table_t find_dissector_table(const char *name);
161 /* Get the UI name for a sub-dissector table, given its internal name */
162 extern char *get_dissector_table_ui_name(const char *name);
164 /* Get the field type for values of the selector for a dissector table,
165 given the table's internal name */
166 extern ftenum_t get_dissector_table_selector_type(const char *name);
168 /* Get the base to use when displaying values of the selector for a
169 sub-dissector table, given the table's internal name */
170 extern int get_dissector_table_base(const char *name);
172 /* Add an entry to a uint dissector table. */
173 extern void dissector_add(const char *abbrev, guint32 pattern,
174 dissector_handle_t handle);
176 /* Delete the entry for a dissector in a uint dissector table
177 with a particular pattern. */
178 extern void dissector_delete(const char *name, guint32 pattern,
179 dissector_handle_t handle);
181 /* Change the entry for a dissector in a uint dissector table
182 with a particular pattern to use a new dissector handle. */
183 extern void dissector_change(const char *abbrev, guint32 pattern,
184 dissector_handle_t handle);
186 /* Reset an entry in a uint dissector table to its initial value. */
187 extern void dissector_reset(const char *name, guint32 pattern);
189 /* Look for a given value in a given uint dissector table and, if found,
190 call the dissector with the arguments supplied, and return TRUE,
191 otherwise return FALSE. */
192 extern gboolean dissector_try_port(dissector_table_t sub_dissectors,
193 guint32 port, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
195 /* Look for a given value in a given uint dissector table and, if found,
196 return the dissector handle for that value. */
197 extern dissector_handle_t dissector_get_port_handle(
198 dissector_table_t sub_dissectors, guint32 port);
200 /* Add an entry to a string dissector table. */
201 extern void dissector_add_string(const char *name, gchar *pattern,
202 dissector_handle_t handle);
204 /* Delete the entry for a dissector in a string dissector table
205 with a particular pattern. */
206 extern void dissector_delete_string(const char *name, const gchar *pattern,
207 dissector_handle_t handle);
209 /* Change the entry for a dissector in a string dissector table
210 with a particular pattern to use a new dissector handle. */
211 extern void dissector_change_string(const char *name, gchar *pattern,
212 dissector_handle_t handle);
214 /* Reset an entry in a string sub-dissector table to its initial value. */
215 extern void dissector_reset_string(const char *name, const gchar *pattern);
217 /* Look for a given string in a given dissector table and, if found, call
218 the dissector with the arguments supplied, and return TRUE, otherwise
220 extern gboolean dissector_try_string(dissector_table_t sub_dissectors,
221 const gchar *string, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
223 /* Look for a given value in a given string dissector table and, if found,
224 return the dissector handle for that value. */
225 extern dissector_handle_t dissector_get_string_handle(
226 dissector_table_t sub_dissectors, const gchar *string);
228 /* Add a handle to the list of handles that *could* be used with this
229 table. That list is used by code in the UI. */
230 extern void dissector_add_handle(const char *name, dissector_handle_t handle);
232 /* List of "heuristic" dissectors (which get handed a packet, look at it,
233 and either recognize it as being for their protocol, dissect it, and
234 return TRUE, or don't recognize it and return FALSE) to be called
235 by another dissector. */
236 typedef GSList *heur_dissector_list_t;
238 /** A protocol uses this function to register a heuristic sub-dissector list.
239 * Call this in the parent dissectors proto_register function.
241 * @param name the name of this protocol
242 * @param list the list of heuristic sub-dissectors to be registered
244 extern void register_heur_dissector_list(const char *name,
245 heur_dissector_list_t *list);
247 /** Try all the dissectors in a given heuristic dissector list. This is done,
248 * until we find one that recognizes the protocol.
249 * Call this while the parent dissector running.
251 * @param sub_dissectors the sub-dissector list
252 * @param tvb the tv_buff with the (remaining) packet data
253 * @param pinfo the packet info of this packet (additional info)
254 * @param tree the protocol tree to be build or NULL
255 * @return TRUE if the packet was recognized by the sub-dissector (stop dissection here)
257 extern gboolean dissector_try_heuristic(heur_dissector_list_t sub_dissectors,
258 tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
260 /** Type of a heuristic dissector, used in heur_dissector_add().
262 * @param tvb the tv_buff with the (remaining) packet data
263 * @param pinfo the packet info of this packet (additional info)
264 * @param tree the protocol tree to be build or NULL
265 * @return TRUE if the packet was recognized by the sub-dissector (stop dissection here)
267 typedef gboolean (*heur_dissector_t)(tvbuff_t *tvb, packet_info *pinfo,
270 /** Add a sub-dissector to a heuristic dissector list.
271 * Call this in the proto_handoff function of the sub-dissector.
273 * @param name the name of the "parent" protocol, e.g. "tcp"
274 * @param dissector the sub-dissector to be registered
275 * @param proto the protocol id of the sub-dissector
277 extern void heur_dissector_add(const char *name, heur_dissector_t dissector,
280 /* Register a dissector. */
281 extern void register_dissector(const char *name, dissector_t dissector,
283 extern void new_register_dissector(const char *name, new_dissector_t dissector,
286 /* Get the short name of the protocol for a dissector handle. */
287 extern char *dissector_handle_get_short_name(dissector_handle_t handle);
289 /* Get the index of the protocol for a dissector handle. */
290 extern int dissector_handle_get_protocol_index(dissector_handle_t handle);
292 /* Find a dissector by name. */
293 extern dissector_handle_t find_dissector(const char *name);
295 /* Create an anonymous handle for a dissector. */
296 extern dissector_handle_t create_dissector_handle(dissector_t dissector,
298 extern dissector_handle_t new_create_dissector_handle(new_dissector_t dissector,
301 /* Call a dissector through a handle. */
302 extern int call_dissector(dissector_handle_t handle, tvbuff_t *tvb,
303 packet_info *pinfo, proto_tree *tree);
305 /* Do all one-time initialization. */
306 extern void dissect_init(void);
308 extern void dissect_cleanup(void);
311 * Given a tvbuff, and a length from a packet header, adjust the length
312 * of the tvbuff to reflect the specified length.
314 extern void set_actual_length(tvbuff_t *tvb, guint specified_len);
316 /* Allow protocols to register "init" routines, which are called before
317 we make a pass through a capture file and dissect all its packets
318 (e.g., when we read in a new capture file, or run a "filter packets"
319 or "colorize packets" pass over the current capture file). */
320 extern void register_init_routine(void (*func)(void));
322 /* Initialize all data structures used for dissection. */
323 extern void init_dissection(void);
325 /* Free data structures allocated for dissection. */
326 extern void cleanup_dissection(void);
328 /* Allow protocols to register a "cleanup" routine to be
329 * run after the initial sequential run through the packets.
330 * Note that the file can still be open after this; this is not
331 * the final cleanup. */
332 extern void register_postseq_cleanup_routine(void (*func)(void));
334 /* Call all the registered "postseq_cleanup" routines. */
335 extern void postseq_cleanup_all_protocols(void);
337 /* Allow dissectors to register a "final_registration" routine
338 * that is run like the proto_register_XXX() routine, but the end
339 * end of the epan_init() function; that is, *after* all other
340 * subsystems, liked dfilters, have finished initializing. This is
341 * useful for dissector registration routines which need to compile
342 * display filters. dfilters can't initialize itself until all protocols
343 * have registereed themselvs. */
345 register_final_registration_routine(void (*func)(void));
347 /* Call all the registered "final_registration" routines. */
349 final_registration_all_protocols(void);
352 * Add a new data source to the list of data sources for a frame, given
353 * the tvbuff for the data source and its name.
355 extern void add_new_data_source(packet_info *pinfo, tvbuff_t *tvb,
359 * Free up a frame's list of data sources.
361 extern void free_data_sources(packet_info *pinfo);
364 * Dissectors should never modify the packet data.
366 extern void dissect_packet(epan_dissect_t *edt,
367 union wtap_pseudo_header *pseudo_header, const guchar *pd,
368 frame_data *fd, column_info *cinfo);
370 /* These functions are in packet-ethertype.c */
371 extern void capture_ethertype(guint16 etype, const guchar *pd, int offset,
372 int len, packet_counts *ld);
373 extern void ethertype(guint16 etype, tvbuff_t *tvb, int offset_after_ethertype,
374 packet_info *pinfo, proto_tree *tree, proto_tree *fh_tree,
375 int etype_id, int trailer_id, int fcs_len);
378 * Dump layer/selector/dissector records in a fashion similar to the
379 * proto_registrar_dump_* routines.
381 extern void dissector_dump_decodes(void);
383 #endif /* packet.h */