![Guy Harris](/assets/img/avatar_default.png)
In particular, epan/wslua/lrexlib.c has its own buffer_ routines, causing some linker warnings on some platforms, as reported in bug 10332. (Not to be backported to 1.12, as that would change the API and ABI of libwsutil and libwiretap. We should also make the buffer_ routines in epan/wslua/lrexlib.c static, which should also address this problem, but the name change avoids other potential namespace collisions.) Change-Id: I1d42c7d1778c7e4c019deb2608d476c52001ce28 Reviewed-on: https://code.wireshark.org/review/3351 Reviewed-by: Guy Harris <guy@alum.mit.edu>
294 lines
8.8 KiB
C
294 lines
8.8 KiB
C
/* daintree_sna.c
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* Routines for opening .dcf capture files created by Daintree's
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* Sensor Network Analyzer for 802.15.4 radios
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* Copyright 2009, Exegin Technologies Limited <fff@exegin.com>
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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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* Started with packetlogger.c as a template, but little packetlogger code
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* remains. Borrowed many snippets from dbs-etherwatch.c, the
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* daintree_sna_process_hex_data function having the largest chunk.
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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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/* This module reads capture files saved by Daintree's Sensor Network Analyzer.
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* Daintree captures are plain text files with a two line header,
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* followed by packet records, one per line, with whitespace separated fields
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* consisting of: packet number, time, bytes of capture data, capture data,
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* unknown, unknown, signal strength?, unknown, etc, and terminated with CRLF.
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*/
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/* Example capture file:
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#Format=4
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# SNA v2.2.0.4 SUS:20090709 ACT:819705
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1 1233783799.326400 10 030809ffffffff07ffff 42 1 -69 25 2 0 1 32767
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2 1233783799.477440 5 02000bffff 110 1 -44 25 6 0 1 32767
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3 1233783799.809920 5 020013ffff 107 1 -45 25 43 0 1 3276
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*/
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#include "config.h"
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#include <glib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <ctype.h>
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#include "wtap.h"
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#include "wtap-int.h"
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#include <wsutil/buffer.h>
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#include "file_wrappers.h"
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#include "daintree-sna.h"
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typedef struct daintree_sna_header {
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guint32 len;
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guint64 ts;
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} daintree_sna_header_t;
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#define DAINTREE_SNA_HEADER_SIZE 2
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#define FCS_LENGTH 2
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static const char daintree_magic_text[] =
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{ '#', 'F', 'o', 'r', 'm', 'a', 't', '=' };
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#define DAINTREE_MAGIC_TEXT_SIZE (sizeof daintree_magic_text)
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#define DAINTREE_MAX_LINE_SIZE 512
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#define READDATA_BUF_SIZE (DAINTREE_MAX_LINE_SIZE/2)
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#define READDATA_MAX_FIELD_SIZE "255" /* DAINTREE_MAX_LINE_SIZE/2 -1 */
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#define COMMENT_LINE daintree_magic_text[0]
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static gboolean daintree_sna_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean daintree_sna_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
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static gboolean daintree_sna_scan_header(struct wtap_pkthdr *phdr,
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char *readLine, char *readData, int *err, gchar **err_info);
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static gboolean daintree_sna_process_hex_data(struct wtap_pkthdr *phdr,
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Buffer *buf, char *readData, int *err, gchar **err_info);
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/* Open a file and determine if it's a Daintree file */
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int daintree_sna_open(wtap *wth, int *err, gchar **err_info)
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{
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char readLine[DAINTREE_MAX_LINE_SIZE];
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guint i;
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/* get first line of file header */
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if (file_gets(readLine, DAINTREE_MAX_LINE_SIZE, wth->fh)==NULL) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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/* check magic text */
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i = 0;
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while (i < DAINTREE_MAGIC_TEXT_SIZE) {
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if (readLine[i] != daintree_magic_text[i]) return 0; /* not daintree format */
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i++;
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}
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/* read second header line */
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if (file_gets(readLine, DAINTREE_MAX_LINE_SIZE, wth->fh)==NULL) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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if (readLine[0] != COMMENT_LINE) return 0; /* daintree files have a two line header */
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/* set up the pointers to the handlers for this file type */
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wth->subtype_read = daintree_sna_read;
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wth->subtype_seek_read = daintree_sna_seek_read;
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/* set up for file type */
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_DAINTREE_SNA;
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wth->file_encap = WTAP_ENCAP_IEEE802_15_4_NOFCS;
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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wth->snapshot_length = 0; /* not available in header */
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return 1; /* it's a Daintree file */
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}
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/* Read the capture file sequentially
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* Wireshark scans the file with sequential reads during preview and initial display. */
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static gboolean
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daintree_sna_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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{
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char readLine[DAINTREE_MAX_LINE_SIZE];
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char readData[READDATA_BUF_SIZE];
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*data_offset = file_tell(wth->fh);
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/* we've only seen file header lines starting with '#', but
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* if others appear in the file, they are tossed */
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do {
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if (file_gets(readLine, DAINTREE_MAX_LINE_SIZE, wth->fh) == NULL) {
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*err = file_error(wth->fh, err_info);
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return FALSE; /* all done */
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}
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} while (readLine[0] == COMMENT_LINE);
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/* parse one line of capture data */
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if (!daintree_sna_scan_header(&wth->phdr, readLine, readData,
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err, err_info))
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return FALSE;
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/* process packet data */
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return daintree_sna_process_hex_data(&wth->phdr, wth->frame_buffer,
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readData, err, err_info);
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}
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/* Read the capture file randomly
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* Wireshark opens the capture file for random access when displaying user-selected packets */
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static gboolean
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daintree_sna_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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{
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char readLine[DAINTREE_MAX_LINE_SIZE];
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char readData[READDATA_BUF_SIZE];
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if(file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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/* It appears only file header lines start with '#', but
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* if we find any others, we toss them */
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do {
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if (file_gets(readLine, DAINTREE_MAX_LINE_SIZE, wth->random_fh) == NULL) {
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*err = file_error(wth->random_fh, err_info);
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return FALSE; /* all done */
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}
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} while (readLine[0] == COMMENT_LINE);
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/* parse one line of capture data */
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if (!daintree_sna_scan_header(phdr, readLine, readData, err, err_info))
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return FALSE;
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/* process packet data */
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return daintree_sna_process_hex_data(phdr, buf, readData, err,
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err_info);
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}
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/* Scan a header line and fill in a struct wtap_pkthdr */
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static gboolean
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daintree_sna_scan_header(struct wtap_pkthdr *phdr, char *readLine,
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char *readData, int *err, gchar **err_info)
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{
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guint64 seconds;
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int useconds;
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phdr->rec_type = REC_TYPE_PACKET;
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phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
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if (sscanf(readLine, "%*s %18" G_GINT64_MODIFIER "u.%9d %9u %" READDATA_MAX_FIELD_SIZE "s",
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&seconds, &useconds, &phdr->len, readData) != 4) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("daintree_sna: invalid read record");
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return FALSE;
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}
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/* Daintree doesn't store the FCS, but pads end of packet with 0xffff, which we toss */
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if (phdr->len <= FCS_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("daintree_sna: packet length <= %u bytes, no frame data present",
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FCS_LENGTH);
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return FALSE;
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}
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phdr->len -= FCS_LENGTH;
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phdr->ts.secs = (time_t) seconds;
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phdr->ts.nsecs = useconds * 1000; /* convert mS to nS */
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return TRUE;
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}
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/* Convert packet data from ASCII hex string to binary in place,
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* sanity-check its length against what we assume is the packet length field,
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* and copy it into a Buffer */
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static gboolean
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daintree_sna_process_hex_data(struct wtap_pkthdr *phdr, Buffer *buf,
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char *readData, int *err, gchar **err_info)
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{
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guchar *str = (guchar *)readData;
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guint bytes;
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guint8 *p;
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p = str; /* overlay source buffer */
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bytes = 0;
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/* convert hex string to guint8 */
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while(*str) {
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/* most significant nibble */
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if (!isxdigit((guchar)*str)) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("daintree_sna: non-hex digit in hex data");
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return FALSE;
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}
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if(isdigit((guchar)*str)) {
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*p = (*str - '0') << 4;
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} else {
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*p = ((tolower(*str) - 'a') + 10) << 4;
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}
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str++;
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/* least significant nibble */
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if (!isxdigit((guchar)*str)) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("daintree_sna: non-hex digit in hex data");
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return FALSE;
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}
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if(isdigit((guchar)*str)) {
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*p += *str - '0';
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} else {
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*p += (tolower(*str) - 'a') + 10;
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}
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str++;
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/* next byte in buffer */
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p++;
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bytes++;
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}
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/* Daintree doesn't store the FCS, but pads end of packet with 0xffff, which we toss */
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if (bytes <= FCS_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("daintree_sna: Only %u bytes of packet data",
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bytes);
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return FALSE;
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}
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bytes -= FCS_LENGTH;
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if (bytes > phdr->len) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("daintree_sna: capture length (%u) > packet length (%u)",
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bytes, phdr->len);
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return FALSE;
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}
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phdr->caplen = bytes;
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ws_buffer_assure_space(buf, bytes);
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memcpy(ws_buffer_start_ptr(buf), readData, bytes);
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return TRUE;
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}
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