2 * Definitions for packet disassembly structures and routines
4 * $Id: packet.h,v 1.31 2001/04/17 06:29:14 guy Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@zing.org>
8 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #include "wiretap/wtap.h"
35 #include "value_string.h"
36 #include "column_info.h"
37 #include "frame_data.h"
38 #include "packet_info.h"
39 #include "column-utils.h"
41 #define hi_nibble(b) (((b) & 0xf0) >> 4)
42 #define lo_nibble(b) ((b) & 0x0f)
44 /* Useful when you have an array whose size you can tell at compile-time */
45 #define array_length(x) (sizeof x / sizeof x[0])
47 /* Useful when highlighting regions inside a dissect_*() function. With this
48 * macro, you can highlight from an arbitrary offset to the end of the
49 * packet (which may come before the end of the frame).
50 * See old_dissect_data() for an example.
52 #define END_OF_FRAME (pi.captured_len - offset)
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, len) ((offset) + (len) <= pi.captured_len)
58 /* Check whether there's any data at all starting at "offset". */
59 #define IS_DATA_IN_FRAME(offset) ((offset) < pi.captured_len)
61 /* To pass one of two strings, singular or plural */
62 #define plurality(d,s,p) ((d) == 1 ? (s) : (p))
64 typedef struct _packet_counts {
78 /* Types of character encodings */
80 CHAR_ASCII = 0, /* ASCII */
81 CHAR_EBCDIC = 1 /* EBCDIC */
84 /* Struct for boolean enumerations */
85 typedef struct true_false_string {
90 void packet_init(void);
91 void packet_cleanup(void);
93 /* Hash table for matching port numbers and dissectors */
94 typedef GHashTable* dissector_table_t;
96 /* types for sub-dissector lookup */
97 typedef void (*old_dissector_t)(const u_char *, int, frame_data *, proto_tree *);
98 typedef void (*dissector_t)(tvbuff_t *, packet_info *, proto_tree *);
100 typedef void (*DATFunc) (gchar *table_name, gpointer key, gpointer value, gpointer user_data);
102 /* Opaque structure - provides type checking but no access to components */
103 typedef struct dtbl_entry dtbl_entry_t;
105 gboolean dissector_get_old_flag (dtbl_entry_t *entry);
106 gint dissector_get_proto (dtbl_entry_t * entry);
107 gint dissector_get_initial_proto (dtbl_entry_t * entry);
108 void dissector_table_foreach_changed (char *name, DATFunc func, gpointer user_data);
109 void dissector_table_foreach (char *name, DATFunc func, gpointer user_data);
110 void dissector_all_tables_foreach_changed (DATFunc func, gpointer user_data);
112 /* a protocol uses the function to register a sub-dissector table */
113 dissector_table_t register_dissector_table(const char *name);
115 /* Add a sub-dissector to a dissector table. Called by the protocol routine */
116 /* that wants to register a sub-dissector. */
117 void old_dissector_add(const char *abbrev, guint32 pattern,
118 old_dissector_t dissector, int proto);
119 void dissector_add(const char *abbrev, guint32 pattern,
120 dissector_t dissector, int proto);
122 /* Add a sub-dissector to a dissector table. Called by the protocol routine */
123 /* that wants to de-register a sub-dissector. */
124 void old_dissector_delete(const char *name, guint32 pattern, old_dissector_t dissector);
125 void dissector_delete(const char *name, guint32 pattern, dissector_t dissector);
127 /* Reset a dissector in a sub-dissector table to its initial value. */
128 void dissector_change(const char *abbrev, guint32 pattern,
129 dissector_t dissector, gboolean old, int proto);
130 void dissector_reset(const char *name, guint32 pattern);
132 /* Look for a given port in a given dissector table and, if found, call
133 the dissector with the arguments supplied, and return TRUE, otherwise
135 gboolean old_dissector_try_port(dissector_table_t sub_dissectors, guint32 port,
136 const u_char *pd, int offset, frame_data *fd, proto_tree *tree);
137 gboolean dissector_try_port(dissector_table_t sub_dissectors, guint32 port,
138 tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
140 /* List of "heuristic" dissectors (which get handed a packet, look at it,
141 and either recognize it as being for their protocol, dissect it, and
142 return TRUE, or don't recognize it and return FALSE) to be called
143 by another dissector. */
144 typedef GSList *heur_dissector_list_t;
146 /* Type of a heuristic dissector */
147 typedef gboolean (*old_heur_dissector_t)(const u_char *, int, frame_data *,
149 typedef gboolean (*heur_dissector_t)(tvbuff_t *, packet_info *,
152 /* A protocol uses this function to register a heuristic dissector list */
153 void register_heur_dissector_list(const char *name, heur_dissector_list_t *list);
155 /* Add a sub-dissector to a heuristic dissector list. Called by the
156 protocol routine that wants to register a sub-dissector. */
157 void old_heur_dissector_add(const char *name, old_heur_dissector_t dissector,
159 void heur_dissector_add(const char *name, heur_dissector_t dissector,
162 /* Try all the dissectors in a given heuristic dissector list until
163 we find one that recognizes the protocol, in which case we return
164 TRUE, or we run out of dissectors, in which case we return FALSE. */
165 gboolean dissector_try_heuristic(heur_dissector_list_t sub_dissectors,
166 tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
168 /* List of "conversation" dissectors (they're not heuristic, but are
169 assigned to a conversation if some other dissector sees some traffic
170 saying "traffic between these hosts on these ports will be of type
171 XXX", e.g. RTSP traffic doing so).
173 These lists are for use by the UI, which, for a given conversation,
174 would offer a list of dissectors that could be used with it; this
175 would include dissectors on the conversation dissector list for
176 the transport-layer protocol for the conversation, as well as
177 dissectors for any port-based lists for that protocol (as a conversation
178 between two ports, both of which have dissectors associated with them,
179 might have been given to the wrong one of those dissectors). */
180 typedef GSList *conv_dissector_list_t;
182 /* A protocol uses this function to register a conversation dissector list */
183 void register_conv_dissector_list(const char *name, conv_dissector_list_t *list);
185 /* Add a sub-dissector to a conversation dissector list. Called by the
186 protocol routine that wants to register a sub-dissector. */
187 void old_conv_dissector_add(const char *name, old_dissector_t dissector,
189 void conv_dissector_add(const char *name, dissector_t dissector,
192 /* Opaque structure - provides type checking but no access to components */
193 typedef struct conv_dtbl_entry conv_dtbl_entry_t;
195 gboolean conv_dissector_get_old_flag (conv_dtbl_entry_t *entry);
196 gint conv_dissector_get_proto (conv_dtbl_entry_t * entry);
197 void dissector_conv_foreach(char *name, DATFunc func, gpointer user_data);
198 void dissector_all_conv_foreach(DATFunc func, gpointer user_data);
200 /* Handle for dissectors you call directly.
201 This handle is opaque outside of "packet.c". */
202 struct dissector_handle;
203 typedef struct dissector_handle *dissector_handle_t;
205 /* Register a dissector. */
206 void register_dissector(const char *name, dissector_t dissector, int proto);
208 /* Find a dissector by name. */
209 dissector_handle_t find_dissector(const char *name);
211 /* Call a dissector through a handle. */
212 void call_dissector(dissector_handle_t handle, tvbuff_t *tvb,
213 packet_info *pinfo, proto_tree *tree);
215 /* Do all one-time initialization. */
216 void dissect_init(void);
218 void dissect_cleanup(void);
220 /* Allow protocols to register "init" routines, which are called before
221 we make a pass through a capture file and dissect all its packets
222 (e.g., when we read in a new capture file, or run a "filter packets"
223 or "colorize packets" pass over the current capture file). */
224 void register_init_routine(void (*func)(void));
226 /* Call all the registered "init" routines. */
227 void init_all_protocols(void);
230 * Dissectors should never modify the packet data.
232 void dissect_packet(tvbuff_t **p_tvb, union wtap_pseudo_header *pseudo_header,
233 const u_char *pd, frame_data *fd, proto_tree *tree);
234 void old_dissect_data(const u_char *, int, frame_data *, proto_tree *);
235 void dissect_data(tvbuff_t *tvb, int, packet_info *pinfo, proto_tree *tree);
238 /* These functions are in packet-ethertype.c */
239 void capture_ethertype(guint16 etype, int offset,
240 const u_char *pd, packet_counts *ld);
241 void ethertype(guint16 etype, tvbuff_t *tvb, int offset_after_ethertype,
242 packet_info *pinfo, proto_tree *tree, proto_tree *fh_tree,
243 int etype_id, int trailer_id);
244 extern const value_string etype_vals[];
246 #endif /* packet.h */