forked from osmocom/wireshark
![Bill Meier](/assets/img/avatar_default.png)
remove C++ incompatibilities https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=8416 attachment #10397 svn path=/trunk/; revision=48438
311 lines
7.2 KiB
C
311 lines
7.2 KiB
C
/* circuit.c
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* Routines for building lists of packets that are part of a "circuit"
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*
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* $Id$
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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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#include "config.h"
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#include <glib.h>
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#include "packet.h"
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#include "circuit.h"
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#include "emem.h"
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/*
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* Hash table for circuits.
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*/
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static GHashTable *circuit_hashtable = NULL;
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static guint32 new_index;
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/*
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* Protocol-specific data attached to a circuit_t structure - protocol
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* index and opaque pointer.
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*/
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typedef struct _circuit_proto_data {
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int proto;
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void *proto_data;
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} circuit_proto_data;
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/*
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* Compute the hash value for a circuit.
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*/
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static guint
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circuit_hash(gconstpointer v)
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{
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const circuit_key *key = (const circuit_key *)v;
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return key->ctype ^ key->circuit_id;
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}
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/*
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* Compare two circuit keys.
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*/
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static gint
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circuit_match(gconstpointer v, gconstpointer w)
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{
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const circuit_key *v1 = (const circuit_key *)v;
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const circuit_key *v2 = (const circuit_key *)w;
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return v1->ctype == v2->ctype && v1->circuit_id == v2->circuit_id;
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}
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/*
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* Destroy all existing circuits.
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*/
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void
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circuit_cleanup(void)
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{
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/*
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* Free up any space allocated for the circuit hashtable.
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*
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* We can free the hash as the structures pointed to in the
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* hash are in "seasonal" memory which is freed separately.
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* Note: circuit_cleanup() must be called only when
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* seasonal memory is also freed.
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*/
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if (circuit_hashtable != NULL)
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g_hash_table_destroy(circuit_hashtable);
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circuit_hashtable = NULL;
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}
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/*
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* Initialize some variables every time a file is loaded or re-loaded.
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* Create a new hash table for the circuits in the new file.
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*/
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void
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circuit_init(void)
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{
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g_assert(circuit_hashtable == NULL);
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circuit_hashtable = g_hash_table_new(circuit_hash, circuit_match);
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/*
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* Start the circuit indices over at 0.
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*/
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new_index = 0;
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}
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/*
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* Given a circuit type and circuit ID for a packet, create a new circuit
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* to contain packets for that circuit.
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*/
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circuit_t *
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circuit_new(circuit_type ctype, guint32 circuit_id, guint32 first_frame)
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{
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circuit_t *circuit, *old_circuit;
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circuit_key *new_key;
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new_key = se_new(struct circuit_key);
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new_key->ctype = ctype;
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new_key->circuit_id = circuit_id;
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circuit = se_new(circuit_t);
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circuit->next = NULL;
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circuit->first_frame = first_frame;
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circuit->last_frame = 0; /* not known yet */
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circuit->index = new_index;
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circuit->data_list = NULL;
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circuit->dissector_handle = NULL;
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circuit->key_ptr = new_key;
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new_index++;
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/*
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* Is there already a circuit with this circuit ID?
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*/
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old_circuit = (circuit_t *)g_hash_table_lookup(circuit_hashtable, new_key);
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if (old_circuit != NULL) {
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/*
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* Yes. Find the last circuit in the list of circuits
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* with this circuit ID, and if its last frame isn't
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* known, make it be the previous frame to this one.
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*/
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while (old_circuit->next != NULL)
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old_circuit = old_circuit->next;
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if (old_circuit->last_frame == 0)
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old_circuit->last_frame = first_frame - 1;
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/*
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* Now put the new circuit after the last one in the
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* list.
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*/
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old_circuit->next = circuit;
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} else {
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/*
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* No. This is the first one with this circuit ID; add
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* it to the hash table.
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*/
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g_hash_table_insert(circuit_hashtable, new_key, circuit);
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}
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return circuit;
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}
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/*
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* Given a circuit type and ID, and a frame number, search for a circuit with
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* that type and ID whose range of frames includes that frame number.
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* Returns NULL if not found.
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*/
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circuit_t *
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find_circuit(circuit_type ctype, guint32 circuit_id, guint32 frame)
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{
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circuit_key key;
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circuit_t *circuit;
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key.ctype = ctype;
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key.circuit_id = circuit_id;
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/*
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* OK, search the list of circuits with that type and ID for
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* a circuit whose range of frames includes that frame number.
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*/
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for (circuit = (circuit_t *)g_hash_table_lookup(circuit_hashtable, &key);
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circuit != NULL; circuit = circuit->next) {
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/*
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* The circuit includes that frame number if:
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*
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* the circuit's first frame is unknown or is at or
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* before that frame
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*
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* and
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*
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* the circuit's last frame is unknown or is at or
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* after that frame.
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*/
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if ((circuit->first_frame == 0 || circuit->first_frame <= frame)
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&& (circuit->last_frame == 0 || circuit->last_frame >= frame))
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break;
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}
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return circuit;
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}
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/*
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* Set the last frame of a circuit, if it's not already known,
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* "closing" the circuit.
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*/
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void
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close_circuit(circuit_t *circuit, guint32 last_frame)
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{
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if (circuit->last_frame == 0)
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circuit->last_frame = last_frame;
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}
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static gint
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p_compare(gconstpointer a, gconstpointer b)
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{
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const circuit_proto_data *ap = (const circuit_proto_data *)a;
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const circuit_proto_data *bp = (const circuit_proto_data *)b;
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if (ap->proto > bp->proto)
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return 1;
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else if (ap->proto == bp->proto)
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return 0;
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else
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return -1;
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}
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void
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circuit_add_proto_data(circuit_t *conv, int proto, void *proto_data)
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{
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circuit_proto_data *p1 = se_new(circuit_proto_data);
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p1->proto = proto;
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p1->proto_data = proto_data;
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/* Add it to the list of items for this circuit. */
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conv->data_list = g_slist_insert_sorted(conv->data_list, (gpointer *)p1,
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p_compare);
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}
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void *
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circuit_get_proto_data(circuit_t *conv, int proto)
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{
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circuit_proto_data temp, *p1;
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GSList *item;
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temp.proto = proto;
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temp.proto_data = NULL;
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item = g_slist_find_custom(conv->data_list, (gpointer *)&temp,
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p_compare);
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if (item != NULL) {
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p1 = (circuit_proto_data *)item->data;
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return p1->proto_data;
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}
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return NULL;
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}
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void
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circuit_delete_proto_data(circuit_t *conv, int proto)
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{
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circuit_proto_data temp;
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GSList *item;
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temp.proto = proto;
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temp.proto_data = NULL;
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item = g_slist_find_custom(conv->data_list, (gpointer *)&temp,
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p_compare);
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if (item != NULL)
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conv->data_list = g_slist_remove(conv->data_list, item);
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}
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void
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circuit_set_dissector(circuit_t *circuit, dissector_handle_t handle)
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{
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circuit->dissector_handle = handle;
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}
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dissector_handle_t
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circuit_get_dissector(circuit_t *circuit)
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{
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return circuit->dissector_handle;
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}
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/*
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* Given a circuit type and ID for a packet, search for a matching
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* circuit and, if found and it has a circuit dissector,
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* call that dissector and return TRUE, otherwise return FALSE.
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*/
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gboolean
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try_circuit_dissector(circuit_type ctype, guint32 circuit_id, guint32 frame,
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tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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circuit_t *circuit;
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circuit = find_circuit(ctype, circuit_id, frame);
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if (circuit != NULL) {
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if (circuit->dissector_handle == NULL)
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return FALSE;
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call_dissector(circuit->dissector_handle, tvb, pinfo,
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tree);
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return TRUE;
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}
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return FALSE;
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}
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