forked from osmocom/wireshark
139 lines
4.6 KiB
C
139 lines
4.6 KiB
C
/* export_object_tftp.c
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* Routines for aving objects (files) found in TFTP sessions
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* See also: export_object.c / export_object.h for common code
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* Initial file, prototypes and general structure initially copied
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* from export_object_smb.c
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*
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* Martin Mathieson
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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,
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* USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/dissectors/packet-tftp.h>
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#include <epan/tap.h>
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#include "export_object.h"
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/* A list of block list entries to delete from cleanup callback when window is closed. */
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typedef struct eo_info_dynamic_t {
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gchar *filename;
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GSList *block_list;
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} eo_info_dynamic_t;
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static GSList *s_dynamic_info_list = NULL;
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/* Tap function */
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gboolean
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eo_tftp_packet(void *tapdata, packet_info *pinfo, epan_dissect_t *edt _U_,
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const void *data)
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{
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export_object_list_t *object_list = (export_object_list_t *)tapdata;
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const tftp_eo_t *eo_info = (const tftp_eo_t *)data;
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export_object_entry_t *entry;
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GSList *block_iterator;
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guint payload_data_offset = 0;
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eo_info_dynamic_t *dynamic_info;
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/* These values will be freed when the Export Object window is closed. */
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entry = (export_object_entry_t*)g_malloc(sizeof(export_object_entry_t));
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/* Remember which frame had the last block of the file */
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entry->pkt_num = pinfo->num;
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/* Copy filename */
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entry->filename = g_strdup(g_path_get_basename(eo_info->filename));
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/* Iterate over list of blocks and concatenate into contiguous memory */
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entry->payload_len = eo_info->payload_len;
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entry->payload_data = (guint8 *)g_try_malloc((gsize)entry->payload_len);
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for (block_iterator = eo_info->block_list; block_iterator; block_iterator = block_iterator->next) {
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file_block_t *block = (file_block_t*)block_iterator->data;
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memcpy(entry->payload_data + payload_data_offset,
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block->data,
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block->length);
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payload_data_offset += block->length;
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}
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/* These 2 fields not used */
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entry->hostname = NULL;
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entry->content_type = NULL;
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/* Add to list of entries to be cleaned up. eo_info is only packet scope, so
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need to make list only of block list now */
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dynamic_info = (eo_info_dynamic_t*)g_malloc(sizeof(eo_info_dynamic_t));
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dynamic_info->filename = eo_info->filename;
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dynamic_info->block_list = eo_info->block_list;
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s_dynamic_info_list = g_slist_append(s_dynamic_info_list, (eo_info_dynamic_t*)dynamic_info);
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/* Pass out entry to the GUI */
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object_list_add_entry(object_list, entry);
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return TRUE; /* State changed - window should be redrawn */
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}
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/* Clean up the stored parts of a single tapped entry */
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static void cleanup_tftp_eo(eo_info_dynamic_t *dynamic_info)
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{
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GSList *block_iterator;
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/* Free the filename */
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g_free(dynamic_info->filename);
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/* Walk list of block items */
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for (block_iterator = dynamic_info->block_list; block_iterator; block_iterator = block_iterator->next) {
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file_block_t *block = (file_block_t*)(block_iterator->data);
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/* Free block data */
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wmem_free(NULL, block->data);
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/* Free block itself */
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g_free(block);
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}
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}
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/* Callback for freeing up data supplied with taps. The taps themselves only have
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packet scope, so only store/free dynamic memory pointers */
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void eo_tftp_cleanup(void)
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{
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/* Cleanup each entry in the global list */
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GSList *dynamic_iterator;
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for (dynamic_iterator = s_dynamic_info_list; dynamic_iterator; dynamic_iterator = dynamic_iterator->next) {
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eo_info_dynamic_t *dynamic_info = (eo_info_dynamic_t*)dynamic_iterator->data;
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cleanup_tftp_eo(dynamic_info);
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}
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/* List is empty again */
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s_dynamic_info_list = NULL;
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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