339 lines
12 KiB
C
339 lines
12 KiB
C
/* file-pcap.c
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* Routines for PCAP File Format
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* http://www.tcpdump.org/manpages/pcap-savefile.5.html
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*
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* Copyright 2015, Michal Labedzki for Tieto Corporation
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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 <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/exceptions.h>
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#include <epan/show_exception.h>
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#include <epan/wmem/wmem.h>
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#include <epan/dissectors/packet-pcap_pktdata.h>
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static int proto_pcap = -1;
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static dissector_handle_t pcap_pktdata_handle;
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static int hf_pcap_header = -1;
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static int hf_pcap_header_magic_number = -1;
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static int hf_pcap_header_version_major = -1;
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static int hf_pcap_header_version_minor = -1;
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static int hf_pcap_header_this_zone = -1;
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static int hf_pcap_header_sigfigs = -1;
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static int hf_pcap_header_snapshot_length = -1;
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static int hf_pcap_header_link_type = -1;
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static int hf_pcap_packet = -1;
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static int hf_pcap_packet_timestamp = -1;
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static int hf_pcap_packet_timestamp_sec = -1;
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static int hf_pcap_packet_timestamp_usec = -1;
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static int hf_pcap_packet_included_length = -1;
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static int hf_pcap_packet_origin_length = -1;
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static int hf_pcap_packet_data = -1;
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static gint ett_pcap = -1;
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static gint ett_pcap_header = -1;
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static gint ett_pcap_packet = -1;
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static gint ett_pcap_packet_data = -1;
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static gint ett_pcap_timestamp = -1;
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static gboolean pref_dissect_next_layer = FALSE;
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void proto_register_file_pcap(void);
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void proto_reg_handoff_file_pcap(void);
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#define MAGIC_NUMBER_SIZE 4
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static int
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dissect_pcap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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static const guint8 pcap_big_endian_magic[MAGIC_NUMBER_SIZE] = {
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0xa1, 0xb2, 0xc3, 0xd4
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};
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static const guint8 pcap_little_endian_magic[MAGIC_NUMBER_SIZE] = {
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0xd4, 0xc3, 0xb2, 0xa1
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};
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static const guint8 pcap_nsec_big_endian_magic[MAGIC_NUMBER_SIZE] = {
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0xa1, 0xb2, 0x3c, 0xd4
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};
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static const guint8 pcap_nsec_little_endian_magic[MAGIC_NUMBER_SIZE] = {
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0xd4, 0x3c, 0xb2, 0xa1
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};
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volatile gint offset = 0;
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proto_tree *main_tree;
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proto_item *main_item;
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proto_tree *header_tree;
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proto_item *header_item;
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proto_item *magic_number_item;
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proto_tree *packet_tree;
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proto_item *packet_item;
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proto_tree *timestamp_tree;
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proto_item *timestamp_item;
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proto_tree *packet_data_tree;
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proto_item *packet_data_item;
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volatile guint32 encoding;
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volatile guint timestamp_scale_factor;
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const char *magic;
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guint32 origin_length;
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guint32 length;
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guint32 link_type;
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volatile guint32 frame_number = 1;
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nstime_t timestamp;
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if (tvb_memeql(tvb, 0, pcap_big_endian_magic, MAGIC_NUMBER_SIZE) == 0) {
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encoding = ENC_BIG_ENDIAN;
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timestamp_scale_factor = 1000;
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magic = "Big-endian";
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} else if (tvb_memeql(tvb, 0, pcap_little_endian_magic, MAGIC_NUMBER_SIZE) == 0) {
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encoding = ENC_LITTLE_ENDIAN;
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timestamp_scale_factor = 1000;
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magic = "Little-endian";
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} else if (tvb_memeql(tvb, 0, pcap_nsec_big_endian_magic, MAGIC_NUMBER_SIZE) == 0) {
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encoding = ENC_BIG_ENDIAN;
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timestamp_scale_factor = 1;
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magic = "Big-endian, nanosecond resolution";
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} else if (tvb_memeql(tvb, 0, pcap_nsec_little_endian_magic, MAGIC_NUMBER_SIZE) == 0) {
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encoding = ENC_LITTLE_ENDIAN;
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timestamp_scale_factor = 1;
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magic = "Little-endian, nanosecond resolution";
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} else {
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/*
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* Not one of the magic numbers we recognize.
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* XXX - add them?
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*/
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return 0;
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}
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main_item = proto_tree_add_item(tree, proto_pcap, tvb, offset, -1, ENC_NA);
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main_tree = proto_item_add_subtree(main_item, ett_pcap);
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header_item = proto_tree_add_item(main_tree, hf_pcap_header , tvb, offset, 24, ENC_NA);
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header_tree = proto_item_add_subtree(header_item, ett_pcap_header);
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magic_number_item = proto_tree_add_item(header_tree, hf_pcap_header_magic_number, tvb, offset, 4, ENC_NA);
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proto_item_append_text(magic_number_item, " (%s)", magic);
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offset += 4;
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proto_tree_add_item(header_tree, hf_pcap_header_version_major, tvb, offset, 2, encoding);
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offset += 2;
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proto_tree_add_item(header_tree, hf_pcap_header_version_minor, tvb, offset, 2, encoding);
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offset += 2;
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proto_tree_add_item(header_tree, hf_pcap_header_this_zone, tvb, offset, 4, encoding);
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offset += 4;
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proto_tree_add_item(header_tree, hf_pcap_header_sigfigs, tvb, offset, 4, encoding);
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offset += 4;
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proto_tree_add_item(header_tree, hf_pcap_header_snapshot_length, tvb, offset, 4, encoding);
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offset += 4;
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proto_tree_add_item(header_tree, hf_pcap_header_link_type, tvb, offset, 4, encoding);
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link_type = tvb_get_guint32(tvb, offset, encoding);
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offset += 4;
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while (offset < (gint) tvb_reported_length(tvb)) {
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packet_item = proto_tree_add_item(main_tree, hf_pcap_packet, tvb, offset, 4 * 4, ENC_NA);
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packet_tree = proto_item_add_subtree(packet_item, ett_pcap_packet);
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proto_item_append_text(packet_item, " %u", frame_number);
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timestamp.secs = tvb_get_guint32(tvb, offset, encoding);
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timestamp.nsecs = tvb_get_guint32(tvb, offset + 4, encoding) * timestamp_scale_factor;
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timestamp_item = proto_tree_add_time(packet_tree, hf_pcap_packet_timestamp, tvb, offset, 8, ×tamp);
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timestamp_tree = proto_item_add_subtree(timestamp_item, ett_pcap_timestamp);
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proto_tree_add_item(timestamp_tree, hf_pcap_packet_timestamp_sec, tvb, offset, 4, encoding);
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offset += 4;
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proto_tree_add_item(timestamp_tree, hf_pcap_packet_timestamp_usec, tvb, offset, 4, encoding);
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offset += 4;
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proto_tree_add_item_ret_uint(packet_tree, hf_pcap_packet_included_length, tvb, offset, 4, encoding, &length);
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offset += 4;
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proto_tree_add_item_ret_uint(packet_tree, hf_pcap_packet_origin_length, tvb, offset, 4, encoding, &origin_length);
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offset += 4;
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packet_data_item = proto_tree_add_item(packet_tree, hf_pcap_packet_data, tvb, offset, length, ENC_NA);
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packet_data_tree = proto_item_add_subtree(packet_data_item, ett_pcap_packet_data);
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pinfo->num = frame_number;
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pinfo->abs_ts = timestamp;
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if (pref_dissect_next_layer) {
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TRY {
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call_dissector_with_data(pcap_pktdata_handle, tvb_new_subset_length_caplen(tvb, offset, length, origin_length), pinfo, packet_data_tree, &link_type);
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}
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CATCH_BOUNDS_ERRORS {
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show_exception(tvb, pinfo, packet_data_tree, EXCEPT_CODE, GET_MESSAGE);
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}
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ENDTRY;
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}
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offset += length;
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proto_item_set_len(packet_item, 4 * 4 + length);
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frame_number += 1;
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}
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return offset;
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}
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static gboolean
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dissect_pcap_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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return dissect_pcap(tvb, pinfo, tree, NULL) > 0;
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}
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void
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proto_register_file_pcap(void)
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{
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module_t *module;
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static hf_register_info hf[] = {
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{ &hf_pcap_header,
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{ "Header", "pcap.header",
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FT_NONE, BASE_NONE, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_magic_number,
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{ "Magic Number", "pcap.header.magic_number",
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FT_BYTES, BASE_NONE, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_version_major,
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{ "Version Major", "pcap.header.version.major",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_version_minor,
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{ "Version Minor", "pcap.header.version.minor",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_this_zone,
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{ "This Zone", "pcap.header.this_zone",
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FT_INT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_sigfigs,
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{ "Sigfigs", "pcap.header.sigfigs",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_snapshot_length,
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{ "Snapshot Length", "pcap.header.snapshot_length",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_header_link_type,
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{ "Link Type", "pcap.header.link_type",
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FT_UINT32, BASE_DEC_HEX, VALS(link_type_vals), 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet,
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{ "Packet", "pcap.packet",
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FT_NONE, BASE_NONE, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet_timestamp,
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{ "Timestamp", "pcap.packet.timestamp",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet_timestamp_sec,
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{ "Timestamp sec", "pcap.packet.timestamp.sec",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet_timestamp_usec,
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{ "Timestamp usec", "pcap.packet.timestamp.usec",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet_included_length,
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{ "Included Length", "pcap.packet.included_length",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet_origin_length,
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{ "Origin Length", "pcap.packet.origin_length",
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FT_UINT32, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_pcap_packet_data,
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{ "Data", "pcap.packet.data",
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FT_NONE, BASE_NONE, NULL, 0x00,
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NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_pcap,
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&ett_pcap_header,
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&ett_pcap_packet,
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&ett_pcap_packet_data,
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&ett_pcap_timestamp
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};
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proto_pcap = proto_register_protocol("PCAP File Format", "File-PCAP", "file-pcap");
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proto_register_field_array(proto_pcap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("file-pcap", dissect_pcap, proto_pcap);
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module = prefs_register_protocol(proto_pcap, NULL);
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prefs_register_static_text_preference(module, "version",
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"PCAP version: >=2.4",
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"Version of file-format supported by this dissector.");
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prefs_register_bool_preference(module, "dissect_next_layer",
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"Dissect next layer",
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"Dissect next layer",
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&pref_dissect_next_layer);
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}
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void
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proto_reg_handoff_file_pcap(void)
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{
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heur_dissector_add("wtap_file", dissect_pcap_heur, "PCAP File", "pcap_wtap", proto_pcap, HEURISTIC_ENABLE);
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pcap_pktdata_handle = find_dissector_add_dependency("pcap_pktdata", proto_pcap);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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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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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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