154 lines
4.5 KiB
C
154 lines
4.5 KiB
C
/*
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* h225-persistentdata.c
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* Source for lists and hash tables used in ethereal's h225 dissector
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* for calculation of delays in h225-calls
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*
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* Copyright 2003 Lars Roland
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <epan/emem.h>
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#include <stdio.h>
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#include <string.h>
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#include "h225-persistentdata.h"
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/* Global Memory Chunks for lists and Global hash tables*/
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static GHashTable *ras_calls[7] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL};
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/*
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* Functions needed for Ras-Hash-Table
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*/
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/* compare 2 keys */
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static gint h225ras_call_equal(gconstpointer k1, gconstpointer k2)
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{
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const h225ras_call_info_key* key1 = (const h225ras_call_info_key*) k1;
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const h225ras_call_info_key* key2 = (const h225ras_call_info_key*) k2;
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return (key1->reqSeqNum == key2->reqSeqNum &&
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key1->conversation == key2->conversation);
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}
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/* calculate a hash key */
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static guint h225ras_call_hash(gconstpointer k)
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{
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const h225ras_call_info_key* key = (const h225ras_call_info_key*) k;
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return key->reqSeqNum + GPOINTER_TO_UINT(key->conversation);
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}
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h225ras_call_t * find_h225ras_call(h225ras_call_info_key *h225ras_call_key ,int category)
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{
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h225ras_call_t *h225ras_call = NULL;
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h225ras_call = (h225ras_call_t *)g_hash_table_lookup(ras_calls[category], h225ras_call_key);
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return h225ras_call;
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}
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h225ras_call_t * new_h225ras_call(h225ras_call_info_key *h225ras_call_key, packet_info *pinfo, guint8 *guid, int category)
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{
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h225ras_call_info_key *new_h225ras_call_key;
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h225ras_call_t *h225ras_call = NULL;
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/* Prepare the value data.
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"req_num" and "rsp_num" are frame numbers;
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frame numbers are 1-origin, so we use 0
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to mean "we don't yet know in which frame
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the reply for this call appears". */
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new_h225ras_call_key = se_alloc(sizeof(h225ras_call_info_key));
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new_h225ras_call_key->reqSeqNum = h225ras_call_key->reqSeqNum;
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new_h225ras_call_key->conversation = h225ras_call_key->conversation;
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h225ras_call = se_alloc(sizeof(h225ras_call_t));
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h225ras_call->req_num = pinfo->fd->num;
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h225ras_call->rsp_num = 0;
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h225ras_call->requestSeqNum = h225ras_call_key->reqSeqNum;
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h225ras_call->responded = FALSE;
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h225ras_call->next_call = NULL;
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h225ras_call->req_time=pinfo->fd->abs_ts;
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memcpy(h225ras_call->guid, guid,16);
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/* store it */
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g_hash_table_insert(ras_calls[category], new_h225ras_call_key, h225ras_call);
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return h225ras_call;
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}
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h225ras_call_t * append_h225ras_call(h225ras_call_t *prev_call, packet_info *pinfo, guint8 *guid, int category _U_)
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{
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h225ras_call_t *h225ras_call = NULL;
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/* Prepare the value data.
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"req_num" and "rsp_num" are frame numbers;
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frame numbers are 1-origin, so we use 0
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to mean "we don't yet know in which frame
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the reply for this call appears". */
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h225ras_call = se_alloc(sizeof(h225ras_call_t));
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h225ras_call->req_num = pinfo->fd->num;
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h225ras_call->rsp_num = 0;
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h225ras_call->requestSeqNum = prev_call->requestSeqNum;
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h225ras_call->responded = FALSE;
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h225ras_call->next_call = NULL;
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h225ras_call->req_time=pinfo->fd->abs_ts;
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memcpy(h225ras_call->guid, guid,16);
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prev_call->next_call = h225ras_call;
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return h225ras_call;
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}
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/* Init routine for hash tables and delay calculation
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This routine will be called by Ethereal, before it
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is (re-)dissecting a trace file from beginning.
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We need to discard and init any state we've saved */
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void
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h225_init_routine(void)
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{
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int i;
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/* free hash-tables for RAS SRT */
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for(i=0;i<7;i++) {
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if (ras_calls[i] != NULL) {
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g_hash_table_destroy(ras_calls[i]);
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ras_calls[i] = NULL;
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}
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}
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/* create new hash-tables for RAS SRT */
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for(i=0;i<7;i++) {
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ras_calls[i] = g_hash_table_new(h225ras_call_hash, h225ras_call_equal);
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}
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}
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