forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
That makes them work as input to a mergecap that writes pcapng files. File types that don't have a single per-file encapsulation type need more work, with multiple fake IDBs, one for each packet encapsulation type seen in the file, unless we can generate real IDBs. Change-Id: I2859e4f7fb15ec0c0f31a4044dc15638e5db7826 Reviewed-on: https://code.wireshark.org/review/37983 Petri-Dish: Guy Harris <gharris@sonic.net> Tested-by: Petri Dish Buildbot Reviewed-by: Guy Harris <gharris@sonic.net>
641 lines
22 KiB
C
641 lines
22 KiB
C
/* dbs-etherwatch.c
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*
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* Wiretap Library
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* Copyright (c) 2001 by Marc Milgram <ethereal@mmilgram.NOSPAMmail.net>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "wtap-int.h"
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#include "dbs-etherwatch.h"
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#include "file_wrappers.h"
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#include <stdlib.h>
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#include <string.h>
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/* This module reads the text output of the 'DBS-ETHERTRACE' command in VMS
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* It was initially based on vms.c.
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*/
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/*
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Example 'ETHERWATCH' output data (with "printable" characters in the
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"printable characters" section of the output replaced by "." if they have
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the 8th bit set, so as not to upset compilers that are expecting text
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in comments to be in a particular character encoding that can't handle
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those values):
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ETHERWATCH X5-008
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42 names and addresses were loaded
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Reading recorded data from PERSISTENCE
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------------------------------------------------------------------------------
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From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
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Protocol 08-00 00 00-00-00-00-00, 60 byte buffer at 10-OCT-2001 10:20:45.16
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[E..<8...........]- 0-[45 00 00 3C 38 93 00 00 1D 06 D2 12 80 93 11 1A]
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[.........(......]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 90 00 00 00 00]
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[................]- 32-[A0 02 FF FF 95 BD 00 00 02 04 05 B4 03 03 04 01]
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[............ ]- 48-[01 01 08 0A 90 90 E5 14 00 00 00 00]
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------------------------------------------------------------------------------
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From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
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Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
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[E..(8......%....]- 0-[45 00 00 28 38 94 00 00 1D 06 D2 25 80 93 11 1A]
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[.........(..Z.4w]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 91 5A 1C 34 77]
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[P.#(.s..........]- 32-[50 10 23 28 C1 73 00 00 02 04 05 B4 03 03 00 00]
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[.. ]- 48-[02 04]
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Alternative HEX only output, slightly more efficient and all wireshark needs:
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------------------------------------------------------------------------------
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From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
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Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
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0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
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20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
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40-[03 30 30 30 30 30 00 00 03 30]
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*/
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/* Magic text to check for DBS-ETHERWATCH-ness of file */
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static const char dbs_etherwatch_hdr_magic[] =
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{ 'E', 'T', 'H', 'E', 'R', 'W', 'A', 'T', 'C', 'H', ' '};
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#define DBS_ETHERWATCH_HDR_MAGIC_SIZE \
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(sizeof dbs_etherwatch_hdr_magic / sizeof dbs_etherwatch_hdr_magic[0])
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/* Magic text for start of packet */
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static const char dbs_etherwatch_rec_magic[] =
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{'F', 'r', 'o', 'm', ' '};
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#define DBS_ETHERWATCH_REC_MAGIC_SIZE \
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(sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
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/*
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* Default packet size - maximum normal Ethernet packet size, without an
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* FCS.
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*/
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#define DBS_ETHERWATCH_MAX_ETHERNET_PACKET_LEN 1514
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static gboolean dbs_etherwatch_read(wtap *wth, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info, gint64 *data_offset);
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static gboolean dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
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wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
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static gboolean parse_dbs_etherwatch_packet(FILE_T fh, wtap_rec *rec,
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Buffer* buf, int *err, gchar **err_info);
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static guint parse_single_hex_dump_line(char* rec, guint8 *buf,
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int byte_offset);
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static guint parse_hex_dump(char* dump, guint8 *buf, char seperator, char end);
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/* Seeks to the beginning of the next packet, and returns the
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byte offset. Returns -1 on failure, and sets "*err" to the error
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and "*err_info" to null or an additional error string. */
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static gint64 dbs_etherwatch_seek_next_packet(wtap *wth, int *err,
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gchar **err_info)
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{
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int byte;
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unsigned int level = 0;
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gint64 cur_off;
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while ((byte = file_getc(wth->fh)) != EOF) {
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if (byte == dbs_etherwatch_rec_magic[level]) {
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level++;
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if (level >= DBS_ETHERWATCH_REC_MAGIC_SIZE) {
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/* note: we're leaving file pointer right after the magic characters */
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cur_off = file_tell(wth->fh);
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if (cur_off == -1) {
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/* Error. */
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*err = file_error(wth->fh, err_info);
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return -1;
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}
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return cur_off + 1;
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}
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} else {
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level = 0;
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}
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}
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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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return -1;
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}
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#define DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
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#define DBS_ETHERWATCH_LINE_LENGTH 240
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/* Look through the first part of a file to see if this is
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* a DBS Ethertrace text trace file.
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*
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* Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
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* if we get an I/O error, "*err" will be set to a non-zero value and
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* "*err_info" will be set to null or an error string.
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*/
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static gboolean dbs_etherwatch_check_file_type(wtap *wth, int *err,
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gchar **err_info)
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{
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char buf[DBS_ETHERWATCH_LINE_LENGTH];
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int line, byte;
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gsize reclen;
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unsigned int i, level;
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buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
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for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
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if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh) == NULL) {
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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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return FALSE;
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}
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reclen = strlen(buf);
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if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
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continue;
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level = 0;
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for (i = 0; i < reclen; i++) {
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byte = buf[i];
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if (byte == dbs_etherwatch_hdr_magic[level]) {
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level++;
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if (level >=
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DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
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return TRUE;
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}
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}
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else
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level = 0;
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}
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}
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*err = 0;
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return FALSE;
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}
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wtap_open_return_val dbs_etherwatch_open(wtap *wth, int *err, gchar **err_info)
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{
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/* Look for DBS ETHERWATCH header */
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if (!dbs_etherwatch_check_file_type(wth, err, err_info)) {
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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}
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wth->file_encap = WTAP_ENCAP_ETHERNET;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_DBS_ETHERWATCH;
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wth->snapshot_length = 0; /* not known */
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wth->subtype_read = dbs_etherwatch_read;
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wth->subtype_seek_read = dbs_etherwatch_seek_read;
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wth->file_tsprec = WTAP_TSPREC_CSEC;
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/*
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* Add an IDB; we don't know how many interfaces were
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* involved, so we just say one interface, about which
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* we only know the link-layer type, snapshot length,
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* and time stamp resolution.
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*/
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wtap_add_generated_idb(wth);
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return WTAP_OPEN_MINE;
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}
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/* Find the next packet and parse it; called from wtap_read(). */
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static gboolean dbs_etherwatch_read(wtap *wth, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info, gint64 *data_offset)
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{
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gint64 offset;
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/* Find the next packet */
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offset = dbs_etherwatch_seek_next_packet(wth, err, err_info);
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if (offset < 1)
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return FALSE;
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*data_offset = offset;
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/* Parse the packet */
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return parse_dbs_etherwatch_packet(wth->fh, rec, buf, err, err_info);
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}
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/* Used to read packets in random-access fashion */
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static gboolean
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dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
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wtap_rec *rec, Buffer *buf, int *err, gchar **err_info)
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{
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if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
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return FALSE;
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return parse_dbs_etherwatch_packet(wth->random_fh, rec, buf, err,
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err_info);
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}
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/* Parse a packet */
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/*
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Packet header:
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1 2 3 4
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0123456789012345678901234567890123456789012345
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From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
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Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
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*/
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#define MAC_ADDR_LENGTH 6 /* Length MAC address */
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#define DEST_MAC_PREFIX "] to " /* Prefix to the dest. MAC address */
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#define PROTOCOL_LENGTH 2 /* Length protocol */
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#define PROTOCOL_POS 9 /* Position protocol */
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#define SAP_LENGTH 2 /* Length DSAP+SSAP */
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#define SAP_POS 9 /* Position DSAP+SSAP */
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#define CTL_UNNUMB_LENGTH 1 /* Length unnumbered control field */
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#define CTL_NUMB_LENGTH 2 /* Length numbered control field */
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#define CTL_POS 15 /* Position control field */
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#define PID_LENGTH 5 /* Length PID */
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#define PID_POS 18 /* Position PID */
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#define LENGTH_POS 33 /* Position length */
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#define HEX_HDR_SPR '-' /* Seperator char header hex values */
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#define HEX_HDR_END ' ' /* End char hdr. hex val. except PID */
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#define HEX_PID_END ',' /* End char PID hex value */
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#define IEEE802_LEN_LEN 2 /* Length of the IEEE 802 len. field */
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/*
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To check whether it is Ethernet II or IEEE 802 we check the values of the
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control field and PID, when they are all 0's we assume it is Ethernet II
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else IEEE 802. In IEEE 802 the DSAP and SSAP are behind protocol, the
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length in the IEEE data we have to construct.
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*/
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#define ETH_II_CHECK_POS 15
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#define ETH_II_CHECK_STR "00 00-00-00-00-00,"
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/*
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To check whether it IEEE 802.3 with SNAP we check that both the DSAP & SSAP
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values are 0xAA and the control field 0x03.
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*/
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#define SNAP_CHECK_POS 9
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#define SNAP_CHECK_STR "AA-AA 03"
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/*
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To check whether the control field is 1 or two octets we check if it is
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unnumbered. Unnumbered has length 1, numbered 2.
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*/
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#define CTL_UNNUMB_MASK 0x03
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#define CTL_UNNUMB_VALUE 0x03
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static gboolean
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parse_dbs_etherwatch_packet(FILE_T fh, wtap_rec *rec, Buffer* buf,
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int *err, gchar **err_info)
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{
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guint8 *pd;
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char line[DBS_ETHERWATCH_LINE_LENGTH];
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int num_items_scanned;
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int eth_hdr_len, pkt_len, csec;
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int length_pos, length_from, length;
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struct tm tm;
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char mon[4] = "xxx";
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gchar *p;
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static const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
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int count, line_count;
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/* Make sure we have enough room for a regular Ethernet packet */
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ws_buffer_assure_space(buf, DBS_ETHERWATCH_MAX_ETHERNET_PACKET_LEN);
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pd = ws_buffer_start_ptr(buf);
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eth_hdr_len = 0;
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memset(&tm, 0, sizeof(tm));
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/* Our file pointer should be on the first line containing the
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* summary information for a packet. Read in that line and
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* extract the useful information
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*/
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if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
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*err = file_error(fh, err_info);
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if (*err == 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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/* Get the destination address */
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p = strstr(line, DEST_MAC_PREFIX);
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if(!p) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: destination address not found");
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return FALSE;
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}
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p += strlen(DEST_MAC_PREFIX);
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if(parse_hex_dump(p, &pd[eth_hdr_len], HEX_HDR_SPR, HEX_HDR_END)
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!= MAC_ADDR_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: destination address not valid");
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return FALSE;
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}
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eth_hdr_len += MAC_ADDR_LENGTH;
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/* Get the source address */
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/*
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* Since the first part of the line is already skipped in order to find
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* the start of the record we cannot index, just look for the first
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* 'HEX' character
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*/
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p = line;
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while(!g_ascii_isxdigit(*p)) {
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p++;
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}
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if(parse_hex_dump(p, &pd[eth_hdr_len], HEX_HDR_SPR,
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HEX_HDR_END) != MAC_ADDR_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: source address not valid");
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return FALSE;
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}
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eth_hdr_len += MAC_ADDR_LENGTH;
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/* Read the next line of the record header */
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if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
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*err = file_error(fh, err_info);
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if (*err == 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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/* Check the lines is as least as long as the length position */
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if(strlen(line) < LENGTH_POS) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: line too short");
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return FALSE;
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}
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num_items_scanned = sscanf(line + LENGTH_POS,
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"%9d byte buffer at %2d-%3s-%4d %2d:%2d:%2d.%9d",
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&pkt_len,
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&tm.tm_mday, mon,
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&tm.tm_year, &tm.tm_hour, &tm.tm_min,
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&tm.tm_sec, &csec);
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if (num_items_scanned != 8) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: header line not valid");
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return FALSE;
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}
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if (pkt_len < 0) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: packet header has a negative packet length");
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return FALSE;
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}
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/* Determine whether it is Ethernet II or IEEE 802 */
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if(strncmp(&line[ETH_II_CHECK_POS], ETH_II_CHECK_STR,
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strlen(ETH_II_CHECK_STR)) == 0) {
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/* Ethernet II */
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/* Get the Protocol */
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if(parse_hex_dump(&line[PROTOCOL_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
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HEX_HDR_END) != PROTOCOL_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: Ethernet II protocol value not valid");
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return FALSE;
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}
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eth_hdr_len += PROTOCOL_LENGTH;
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} else {
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/* IEEE 802 */
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/* Remember where to put the length in the header */
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length_pos = eth_hdr_len;
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/* Leave room in the header for the length */
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eth_hdr_len += IEEE802_LEN_LEN;
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/* Remember how much of the header should not be added to the length */
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length_from = eth_hdr_len;
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/* Get the DSAP + SSAP */
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if(parse_hex_dump(&line[SAP_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
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HEX_HDR_END) != SAP_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: 802.2 DSAP+SSAP value not valid");
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return FALSE;
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}
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eth_hdr_len += SAP_LENGTH;
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/* Get the (first part of the) control field */
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if(parse_hex_dump(&line[CTL_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
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HEX_HDR_END) != CTL_UNNUMB_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: 802.2 control field first part not valid");
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return FALSE;
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}
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/* Determine whether the control is numbered, and thus longer */
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if((pd[eth_hdr_len] & CTL_UNNUMB_MASK) != CTL_UNNUMB_VALUE) {
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/* Get the rest of the control field, the first octet in the PID */
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if(parse_hex_dump(&line[PID_POS],
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&pd[eth_hdr_len + CTL_UNNUMB_LENGTH], HEX_HDR_END,
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HEX_HDR_SPR) != CTL_NUMB_LENGTH - CTL_UNNUMB_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: 802.2 control field second part value not valid");
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return FALSE;
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}
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eth_hdr_len += CTL_NUMB_LENGTH;
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} else {
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eth_hdr_len += CTL_UNNUMB_LENGTH;
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}
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/* Determine whether it is SNAP */
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if(strncmp(&line[SNAP_CHECK_POS], SNAP_CHECK_STR,
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strlen(SNAP_CHECK_STR)) == 0) {
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/* Get the PID */
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if(parse_hex_dump(&line[PID_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
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HEX_PID_END) != PID_LENGTH) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("dbs_etherwatch: 802.2 PID value not valid");
|
|
return FALSE;
|
|
}
|
|
eth_hdr_len += PID_LENGTH;
|
|
}
|
|
/* Write the length in the header */
|
|
length = eth_hdr_len - length_from + pkt_len;
|
|
pd[length_pos] = (length) >> 8;
|
|
pd[length_pos+1] = (length) & 0xFF;
|
|
}
|
|
|
|
rec->rec_type = REC_TYPE_PACKET;
|
|
rec->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
|
|
|
|
p = strstr(months, mon);
|
|
if (p)
|
|
tm.tm_mon = (int)(p - months) / 3;
|
|
tm.tm_year -= 1900;
|
|
|
|
tm.tm_isdst = -1;
|
|
rec->ts.secs = mktime(&tm);
|
|
rec->ts.nsecs = csec * 10000000;
|
|
rec->rec_header.packet_header.caplen = eth_hdr_len + pkt_len;
|
|
rec->rec_header.packet_header.len = eth_hdr_len + pkt_len;
|
|
|
|
if (rec->rec_header.packet_header.caplen > WTAP_MAX_PACKET_SIZE_STANDARD) {
|
|
/*
|
|
* Probably a corrupt capture file; return an error,
|
|
* so that our caller doesn't blow up trying to allocate
|
|
* space for an immensely-large packet.
|
|
*/
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("dbs_etherwatch: File has %u-byte packet, bigger than maximum of %u",
|
|
rec->rec_header.packet_header.caplen, WTAP_MAX_PACKET_SIZE_STANDARD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Make sure we have enough room, even for an oversized Ethernet packet */
|
|
ws_buffer_assure_space(buf, rec->rec_header.packet_header.caplen);
|
|
pd = ws_buffer_start_ptr(buf);
|
|
|
|
/*
|
|
* We don't have an FCS in this frame.
|
|
*/
|
|
rec->rec_header.packet_header.pseudo_header.eth.fcs_len = 0;
|
|
|
|
/* Parse the hex dump */
|
|
count = 0;
|
|
while (count < pkt_len) {
|
|
if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
|
|
*err = file_error(fh, err_info);
|
|
if (*err == 0) {
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
}
|
|
return FALSE;
|
|
}
|
|
if (!(line_count = parse_single_hex_dump_line(line,
|
|
&pd[eth_hdr_len + count], count))) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("dbs_etherwatch: packet data value not valid");
|
|
return FALSE;
|
|
}
|
|
count += line_count;
|
|
if (count > pkt_len) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("dbs_etherwatch: packet data value has too many bytes");
|
|
return FALSE;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* Parse a hex dump line */
|
|
/*
|
|
/DISPLAY=BOTH output:
|
|
|
|
1 2 3 4
|
|
0123456789012345678901234567890123456789012345
|
|
[E..(8...........]- 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A]
|
|
[.........(..Z.4y]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 BF 5A 1C 34 79]
|
|
[P.#(.C...00000..]- 32-[50 10 23 28 C1 43 00 00 03 30 30 30 30 30 00 00]
|
|
[.0 ]- 48-[03 30]
|
|
|
|
/DISPLAY=HEXADECIMAL output:
|
|
|
|
1 2 3 4
|
|
0123456789012345678901234567890123456789012345
|
|
0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
|
|
20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
|
|
40-[03 30 30 30 30 30 00 00 03 30]
|
|
|
|
*/
|
|
|
|
#define TYPE_CHECK_POS 2 /* Position to check the type of hex dump */
|
|
#define TYPE_CHECK_BOTH '[' /* Value at pos. that indicates BOTH type */
|
|
#define COUNT_POS_BOTH 21 /* Count position BOTH type */
|
|
#define COUNT_POS_HEX 1 /* Count position HEX type */
|
|
#define COUNT_SIZE 5 /* Length counter */
|
|
#define HEX_DUMP_START '[' /* Start char */
|
|
#define HEX_DUMP_SPR ' ' /* Seperator char */
|
|
#define HEX_DUMP_END ']' /* End char */
|
|
|
|
/* Take a string representing one line from a hex dump and converts the
|
|
* text to binary data. We check the printed offset with the offset
|
|
* we are passed to validate the record. We place the bytes in the buffer
|
|
* at the specified offset.
|
|
*
|
|
* Returns length parsed if a good hex dump, 0 if bad.
|
|
*/
|
|
static guint
|
|
parse_single_hex_dump_line(char* rec, guint8 *buf, int byte_offset) {
|
|
|
|
int pos, i;
|
|
int value;
|
|
|
|
|
|
/* Check that the record is as least as long as the check offset */
|
|
for(i = 0; i < TYPE_CHECK_POS; i++)
|
|
{
|
|
if(rec[i] == '\0') {
|
|
return 0;
|
|
}
|
|
}
|
|
/* determine the format and thus the counter offset and hex dump length */
|
|
if(rec[TYPE_CHECK_POS] == TYPE_CHECK_BOTH)
|
|
{
|
|
pos = COUNT_POS_BOTH;
|
|
}
|
|
else
|
|
{
|
|
pos = COUNT_POS_HEX;
|
|
}
|
|
|
|
/* Check that the record is as least as long as the start position */
|
|
while(i < pos)
|
|
{
|
|
if(rec[i] == '\0') {
|
|
return 0;
|
|
}
|
|
i++;
|
|
}
|
|
|
|
/* Get the byte_offset directly from the record */
|
|
value = 0;
|
|
for(i = 0; i < COUNT_SIZE; i++) {
|
|
if(!g_ascii_isspace(rec[pos])) {
|
|
if(g_ascii_isdigit(rec[pos])) {
|
|
value *= 10;
|
|
value += rec[pos] - '0';
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
pos++;
|
|
}
|
|
|
|
if (value != byte_offset) {
|
|
return 0;
|
|
}
|
|
|
|
/* find the start of the hex dump */
|
|
while(rec[pos] != HEX_DUMP_START) {
|
|
if(rec[pos] == '\0') {
|
|
return 0;
|
|
}
|
|
pos++;
|
|
}
|
|
pos++;
|
|
return parse_hex_dump(&rec[pos], buf, HEX_DUMP_SPR, HEX_DUMP_END);
|
|
}
|
|
|
|
/* Parse a hex dump */
|
|
static guint
|
|
parse_hex_dump(char* dump, guint8 *buf, char seperator, char end) {
|
|
int pos, count;
|
|
|
|
/* Parse the hex dump */
|
|
pos = 0;
|
|
count = 0;
|
|
while(dump[pos] != end) {
|
|
/* Check the hex value */
|
|
if(!(g_ascii_isxdigit(dump[pos]) &&
|
|
g_ascii_isxdigit(dump[pos + 1]))) {
|
|
return 0;
|
|
}
|
|
/* Get the hex value value */
|
|
if(g_ascii_isdigit(dump[pos])) {
|
|
buf[count] = (dump[pos] - '0') << 4;
|
|
} else {
|
|
buf[count] = (g_ascii_toupper(dump[pos]) - 'A' + 10) << 4;
|
|
}
|
|
pos++;
|
|
if(g_ascii_isdigit(dump[pos])) {
|
|
buf[count] += dump[pos] - '0';
|
|
} else {
|
|
buf[count] += g_ascii_toupper(dump[pos]) - 'A' + 10;
|
|
}
|
|
pos++;
|
|
count++;
|
|
/* Skip the seperator characters */
|
|
while(dump[pos] == seperator) {
|
|
pos++;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|