de3b8195c5
This patch should hopefully remove any possible buffer overflows in parse_line() as reported by the current Coverity scan. I'm not sure that the error it currently reports is valid (I think its confused by supposing that a condition that is being tested can be true, whereas it can't...), but this patch fixes a number of potential problems remaining in the function. svn path=/trunk/; revision=17979
1352 lines
43 KiB
C
1352 lines
43 KiB
C
/* catapult_dct2000.c
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*
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* $Id$
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "catapult_dct2000.h"
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#define MAX_FIRST_LINE_LENGTH 200
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#define MAX_TIMESTAMP_LINE_LENGTH 100
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#define MAX_LINE_LENGTH 32000
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#define MAX_SECONDS_CHARS 16
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#define MAX_SUBSECOND_DECIMALS 4
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#define MAX_CONTEXT_NAME 64
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#define MAX_PROTOCOL_NAME 64
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#define MAX_PORT_DIGITS 2
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#define AAL_HEADER_CHARS 12
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/* TODO:
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- support for x.25?
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*/
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/* 's' or 'r' of a packet as read from .out file */
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typedef enum packet_direction_t
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{
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sent,
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received
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} packet_direction_t;
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typedef struct
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{
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gchar *before_time;
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gchar *after_time;
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} line_prefix_info_t;
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/*******************************************************************/
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/* Information stored external to a file (wtap) needed for dumping */
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typedef struct dct2000_file_externals
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{
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/* Buffer to hold first line, including magic and format number */
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gchar firstline[MAX_FIRST_LINE_LENGTH];
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gint firstline_length;
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/* Buffer to hold second line with formatted file creation data/time */
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gchar secondline[MAX_TIMESTAMP_LINE_LENGTH];
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gint secondline_length;
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/* Hash table to store text prefix data part of displayed packets.
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Records (file offset -> pre-data-prefix-string)
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N.B. This is only needed for dumping
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*/
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GHashTable *line_header_prefixes_table;
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} dct2000_file_externals_t;
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/* This global table maps wtap -> file_external structs */
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static GHashTable *file_externals_table = NULL;
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/***********************************************************/
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/* Transient data used for parsing */
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/* Buffer to hold a single text line read from the file */
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static gchar linebuff[MAX_LINE_LENGTH];
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/* Buffer for separate AAL header */
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static gchar aal_header_chars[AAL_HEADER_CHARS];
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/* 'Magic number' at start of Catapult DCT2000 .out files. */
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static const gchar catapult_dct2000_magic[] = "Session Transcript";
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/* Context name + port that the packet was captured at */
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static gchar context_name[MAX_CONTEXT_NAME];
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static guint8 context_port;
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/* The DCT2000 protocol name of the packet */
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static gchar protocol_name[MAX_PROTOCOL_NAME+1];
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/*************************************************/
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/* Preference state (shared with stub protocol). */
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/* Set to FALSE to get better use out of other */
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/* wiretap applications (mergecap, editcap) */
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gboolean catapult_dct2000_board_ports_only = FALSE;
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/************************************************************/
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/* Functions called from wiretap */
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static gboolean catapult_dct2000_read(wtap *wth, int *err, gchar **err_info,
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long *data_offset);
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static gboolean catapult_dct2000_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header,
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guchar *pd, int length,
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int *err, gchar **err_info);
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static void catapult_dct2000_close(wtap *wth);
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static gboolean catapult_dct2000_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
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const union wtap_pseudo_header *pseudo_header,
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const guchar *pd, int *err);
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static gboolean catapult_dct2000_dump_close(wtap_dumper *wdh, int *err);
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/************************************************************/
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/* Private helper functions */
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static gboolean read_new_line(FILE_T fh, long *offset, gint *length);
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static gboolean parse_line(gint line_length, gint *seconds, gint *useconds,
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long *before_time_offset, long *after_time_offset,
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long *data_offset,
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gint *data_chars,
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packet_direction_t *direction,
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int *encap,
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gboolean seek_read);
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static guchar hex_from_char(gchar c);
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static gchar char_from_hex(guchar hex);
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static void set_pseudo_header_info(wtap *wth,
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int pkt_encap,
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long file_offset,
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union wtap_pseudo_header *pseudo_header,
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gint length,
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packet_direction_t direction);
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static void set_aal_info(union wtap_pseudo_header *pseudo_header, gint length,
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packet_direction_t direction);
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static void set_isdn_info(union wtap_pseudo_header *pseudo_header,
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packet_direction_t direction);
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static void set_ppp_info(union wtap_pseudo_header *pseudo_header,
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packet_direction_t direction);
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static gint prefix_equal(gconstpointer v, gconstpointer v2);
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static guint prefix_hash_func(gconstpointer v);
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static gboolean get_file_time_stamp(time_t *secs, guint32 *usecs);
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static gboolean free_line_prefix_info(gpointer key, gpointer value, gpointer user_data);
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/********************************************/
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/* Open file */
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/********************************************/
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int catapult_dct2000_open(wtap *wth, int *err, gchar **err_info _U_)
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{
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long offset = 0;
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time_t timestamp;
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guint32 usecs;
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gint firstline_length;
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dct2000_file_externals_t *file_externals;
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/* Clear errno before reading from the file */
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errno = 0;
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/*********************************************************************/
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/* Need entry in file_externals table */
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/* Create file externals table if it doesn't yet exist */
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if (file_externals_table == NULL)
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{
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file_externals_table = g_hash_table_new(prefix_hash_func, prefix_equal);
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}
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/********************************************************************/
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/* First line needs to contain at least as many characters as magic */
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read_new_line(wth->fh, &offset, &firstline_length);
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if (((size_t)firstline_length < strlen(catapult_dct2000_magic)) ||
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firstline_length >= MAX_FIRST_LINE_LENGTH)
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{
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return 0;
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}
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/* This file is not for us if it doesn't match our signature */
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if (memcmp(catapult_dct2000_magic, linebuff, strlen(catapult_dct2000_magic)) != 0)
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{
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return 0;
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}
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/* Allocate a new file_externals structure */
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file_externals = g_malloc(sizeof(dct2000_file_externals_t));
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memset((void*)file_externals, '\0', sizeof(dct2000_file_externals_t));
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/* Copy this first line into buffer so could write out later */
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strncpy(file_externals->firstline, linebuff, firstline_length);
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file_externals->firstline_length = firstline_length;
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/***********************************************************/
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/* Second line contains file timestamp */
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/* Store this offset in in wth->capture->catapult_dct2000 */
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read_new_line(wth->fh, &offset, &(file_externals->secondline_length));
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if ((file_externals->secondline_length >= MAX_TIMESTAMP_LINE_LENGTH) ||
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(!get_file_time_stamp(×tamp, &usecs)))
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{
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/* Give up if file time line wasn't valid */
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g_free(file_externals);
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return 0;
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}
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wth->capture.catapult_dct2000 = g_malloc(sizeof(catapult_dct2000_t));
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wth->capture.catapult_dct2000->start_secs = timestamp;
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wth->capture.catapult_dct2000->start_usecs = usecs;
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/* Copy this second line into buffer so could write out later */
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strncpy(file_externals->secondline, linebuff, file_externals->secondline_length);
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/************************************************************/
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/* File is for us. Fill in details so packets can be read */
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/* Set our file type */
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wth->file_type = WTAP_FILE_CATAPULT_DCT2000;
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/* Use our own encapsulation to send all packets to our stub dissector */
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wth->file_encap = WTAP_ENCAP_CATAPULT_DCT2000;
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/* Callbacks for reading operations */
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wth->subtype_read = catapult_dct2000_read;
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wth->subtype_seek_read = catapult_dct2000_seek_read;
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wth->subtype_close = catapult_dct2000_close;
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/* Choose microseconds (have 4 decimal places...) */
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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/**********************************************/
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/* Initialise line_header_prefixes_table */
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file_externals->line_header_prefixes_table =
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g_hash_table_new(prefix_hash_func, prefix_equal);
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/* Add file_externals for this wtap into the global table */
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g_hash_table_insert(file_externals_table,
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(void*)wth, (void*)file_externals);
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*err = errno;
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return 1;
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}
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/**************************************************/
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/* Read function. */
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/* Look for and read the next usable packet */
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/* - return TRUE and details if found */
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/**************************************************/
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gboolean catapult_dct2000_read(wtap *wth, int *err, gchar **err_info _U_,
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long *data_offset)
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{
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long offset = wth->data_offset;
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long dollar_offset, before_time_offset, after_time_offset;
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packet_direction_t direction;
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int encap;
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/* Find wtap external structure for this wtap */
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dct2000_file_externals_t *file_externals =
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(dct2000_file_externals_t*)g_hash_table_lookup(file_externals_table, wth);
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/* There *has* to be an entry for this wth */
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if (!file_externals)
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{
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return FALSE;
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}
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/* Search for a line containing a usable message */
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while (1)
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{
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int line_length, seconds, useconds, data_chars;
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long this_offset = offset;
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/* Are looking for first packet after 2nd line */
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if (wth->data_offset == 0)
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{
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this_offset += (file_externals->firstline_length+1+
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file_externals->secondline_length+1);
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}
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/* Clear errno before reading from the file */
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errno = 0;
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/* Read a new line from file into linebuff */
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if (read_new_line(wth->fh, &offset, &line_length) == FALSE)
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{
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/* Get out when no more lines to be read */
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break;
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}
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/* Try to parse the line as a message */
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if (parse_line(line_length, &seconds, &useconds,
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&before_time_offset, &after_time_offset,
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&dollar_offset,
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&data_chars, &direction, &encap, FALSE))
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{
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guchar *frame_buffer;
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int n;
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int stub_offset = 0;
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line_prefix_info_t *line_prefix_info;
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char timestamp_string[32];
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sprintf(timestamp_string, "%d.%04d", seconds, useconds/100);
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/* All packets go to Catapult DCT2000 stub dissector */
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wth->phdr.pkt_encap = WTAP_ENCAP_CATAPULT_DCT2000;
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/* Set data_offset to the beginning of the line we're returning.
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This will be the seek_off parameter when this frame is re-read.
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*/
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*data_offset = this_offset;
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/* This is the position in the file where the next _read() will be called from */
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wth->data_offset = this_offset + line_length + 1;
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/* Fill in timestamp (capture base + packet offset) */
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wth->phdr.ts.secs = wth->capture.catapult_dct2000->start_secs + seconds;
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if ((wth->capture.catapult_dct2000->start_usecs + useconds) >= 1000000)
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{
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wth->phdr.ts.secs++;
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}
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wth->phdr.ts.nsecs =
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((wth->capture.catapult_dct2000->start_usecs + useconds) % 1000000) *1000;
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/* Get buffer pointer ready */
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buffer_assure_space(wth->frame_buffer,
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strlen(context_name)+1 + /* Context name */
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1 + /* port */
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strlen(protocol_name)+1 + /* Protocol name */
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1 + /* direction */
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1 + /* encap */
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(data_chars/2));
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frame_buffer = buffer_start_ptr(wth->frame_buffer);
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/*********************/
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/* Write stub header */
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/* Context name */
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strcpy((char*)frame_buffer, context_name);
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stub_offset += (strlen(context_name) + 1);
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/* Context port number */
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frame_buffer[stub_offset] = context_port;
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stub_offset++;
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/* Timestamp within file */
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strcpy((char*)&frame_buffer[stub_offset], timestamp_string);
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stub_offset += (strlen(timestamp_string) + 1);
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/* Protocol name */
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strcpy((char*)&frame_buffer[stub_offset], protocol_name);
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stub_offset += (strlen(protocol_name) + 1);
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/* Direction */
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frame_buffer[stub_offset] = direction;
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stub_offset++;
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/* Encap */
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frame_buffer[stub_offset] = (guint8)encap;
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stub_offset++;
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/* Binary data length is half bytestring length + stub header */
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wth->phdr.len = data_chars/2 + stub_offset;
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wth->phdr.caplen = data_chars/2 + stub_offset;
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/*************************/
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/* Copy data into buffer */
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for (n=0; n <= data_chars; n+=2)
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{
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frame_buffer[stub_offset + n/2] =
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(hex_from_char(linebuff[dollar_offset+n]) << 4) |
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hex_from_char(linebuff[dollar_offset+n+1]);
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}
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/* Store the packet prefix in the hash table */
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line_prefix_info = g_malloc(sizeof(line_prefix_info_t));
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line_prefix_info->before_time = g_malloc(before_time_offset+1);
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strncpy(line_prefix_info->before_time, linebuff, before_time_offset);
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line_prefix_info->before_time[before_time_offset] = '\0';
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line_prefix_info->after_time = g_malloc(dollar_offset - after_time_offset);
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strncpy(line_prefix_info->after_time, linebuff+after_time_offset,
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dollar_offset - after_time_offset);
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line_prefix_info->after_time[dollar_offset - after_time_offset-1] = '\0';
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/* Add packet entry into table */
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g_hash_table_insert(file_externals->line_header_prefixes_table,
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(void*)this_offset, line_prefix_info);
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/* Set pseudo-header if necessary */
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set_pseudo_header_info(wth, encap, this_offset, &wth->pseudo_header,
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data_chars/2, direction);
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/* OK, we have packet details to return */
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*err = errno;
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return TRUE;
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}
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}
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/* No packet details to return... */
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*err = errno;
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return FALSE;
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}
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/**************************************************/
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/* Read & seek function. */
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/**************************************************/
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static gboolean
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catapult_dct2000_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd,
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int length, int *err, gchar **err_info)
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{
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long offset = wth->data_offset;
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long dollar_offset, before_time_offset, after_time_offset;
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packet_direction_t direction;
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int encap;
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int seconds, useconds, data_chars;
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/* Reset errno */
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*err = errno = 0;
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/* Seek to beginning of packet */
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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{
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return FALSE;
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}
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/* Re-read whole line (this should succeed) */
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if (read_new_line(wth->random_fh, &offset, &length) == FALSE)
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{
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return FALSE;
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}
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/* Try to parse this line again (should succeed as re-reading...) */
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if (parse_line(length, &seconds, &useconds,
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&before_time_offset, &after_time_offset,
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&dollar_offset,
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&data_chars, &direction, &encap, TRUE))
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{
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int n;
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int stub_offset = 0;
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char timestamp_string[32];
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sprintf(timestamp_string, "%d.%04d", seconds, useconds/100);
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/* Make sure all packets go to catapult dct2000 dissector */
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wth->phdr.pkt_encap = WTAP_ENCAP_CATAPULT_DCT2000;
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/*********************/
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/* Write stub header */
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strcpy((char*)pd, context_name);
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stub_offset += (strlen(context_name) + 1);
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/* Context port number */
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pd[stub_offset] = context_port;
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stub_offset++;
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/* Timestamp within file */
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strcpy((char*)&pd[stub_offset], timestamp_string);
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stub_offset += (strlen(timestamp_string) + 1);
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/* Protocol name */
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strcpy((char*)&pd[stub_offset], protocol_name);
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stub_offset += (strlen(protocol_name) + 1);
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/* Direction */
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pd[stub_offset] = direction;
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stub_offset++;
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/* Encap */
|
|
pd[stub_offset] = encap;
|
|
stub_offset++;
|
|
|
|
/********************************/
|
|
/* Copy packet data into buffer */
|
|
for (n=0; n <= data_chars; n+=2)
|
|
{
|
|
pd[stub_offset + n/2] = (hex_from_char(linebuff[dollar_offset+n]) << 4) |
|
|
hex_from_char(linebuff[dollar_offset+n+1]);
|
|
}
|
|
|
|
/* Set packet pseudo-header if necessary */
|
|
set_pseudo_header_info(wth, encap, seek_off, pseudo_header, data_chars/2, direction);
|
|
|
|
*err = errno = 0;
|
|
return TRUE;
|
|
}
|
|
|
|
/* If get here, must have failed */
|
|
*err = errno;
|
|
*err_info = g_strdup_printf("catapult dct2000: seek_read failed to read/parse "
|
|
"line at position %ld", seek_off);
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/******************************************/
|
|
/* Free dct2000-specific capture info */
|
|
/******************************************/
|
|
void catapult_dct2000_close(wtap *wth)
|
|
{
|
|
/* Look up externals for this file */
|
|
dct2000_file_externals_t *file_externals =
|
|
(dct2000_file_externals_t*)g_hash_table_lookup(file_externals_table, wth);
|
|
|
|
/* The entry *has* to be found */
|
|
if (!file_externals)
|
|
{
|
|
return;
|
|
}
|
|
|
|
/* Free up its line prefix values */
|
|
g_hash_table_foreach_remove(file_externals->line_header_prefixes_table,
|
|
free_line_prefix_info, NULL);
|
|
/* Free up its line prefix table */
|
|
g_hash_table_destroy(file_externals->line_header_prefixes_table);
|
|
|
|
/* And remove the externals entry from the global table */
|
|
g_hash_table_remove(file_externals_table, (void*)wth);
|
|
|
|
/* And free up file_externals itself */
|
|
g_free(file_externals);
|
|
|
|
/* Also free this capture info */
|
|
g_free(wth->capture.catapult_dct2000);
|
|
}
|
|
|
|
|
|
|
|
|
|
/***************************/
|
|
/* Dump functions */
|
|
/***************************/
|
|
|
|
/*****************************************************/
|
|
/* The file that we are writing to has been opened. */
|
|
/* Set other dump callbacks. */
|
|
/*****************************************************/
|
|
gboolean catapult_dct2000_dump_open(wtap_dumper *wdh, gboolean cant_seek _U_, int *err _U_)
|
|
{
|
|
/* Fill in other dump callbacks */
|
|
wdh->subtype_write = catapult_dct2000_dump;
|
|
wdh->subtype_close = catapult_dct2000_dump_close;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/*********************************************************/
|
|
/* Respond to queries about which encap types we support */
|
|
/* writing to. */
|
|
/*********************************************************/
|
|
int catapult_dct2000_dump_can_write_encap(int encap)
|
|
{
|
|
switch (encap)
|
|
{
|
|
case WTAP_ENCAP_CATAPULT_DCT2000:
|
|
/* We support this */
|
|
return 0;
|
|
default:
|
|
return WTAP_ERR_UNSUPPORTED_ENCAP;
|
|
}
|
|
}
|
|
|
|
|
|
/*****************************************/
|
|
/* Write a single packet out to the file */
|
|
/*****************************************/
|
|
gboolean catapult_dct2000_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
|
|
const union wtap_pseudo_header *pseudo_header,
|
|
const guchar *pd, int *err _U_)
|
|
{
|
|
guint32 n;
|
|
line_prefix_info_t *prefix = NULL;
|
|
gchar time_string[16];
|
|
|
|
/******************************************************/
|
|
/* Look up the file_externals structure for this file */
|
|
/* Find wtap external structure for this wtap */
|
|
dct2000_file_externals_t *file_externals =
|
|
(dct2000_file_externals_t*)g_hash_table_lookup(file_externals_table,
|
|
pseudo_header->dct2000.wth);
|
|
|
|
if (wdh->dump.dct2000 == NULL)
|
|
{
|
|
/* Allocate the dct2000-specific dump structure */
|
|
wdh->dump.dct2000 = g_malloc(sizeof(catapult_dct2000_t));
|
|
|
|
/* Write out saved first line */
|
|
fwrite(file_externals->firstline, 1, file_externals->firstline_length, wdh->fh);
|
|
fwrite("\n", 1, 1, wdh->fh);
|
|
|
|
/* Also write out saved second line with timestamp corresponding to the
|
|
opening time of the log.
|
|
*/
|
|
fwrite(file_externals->secondline, 1, file_externals->secondline_length, wdh->fh);
|
|
fwrite("\n", 1, 1, wdh->fh);
|
|
|
|
/* Allocate the dct2000-specific dump structure */
|
|
wdh->dump.dct2000 = g_malloc(sizeof(catapult_dct2000_t));
|
|
|
|
/* Copy time of beginning of file */
|
|
wdh->dump.dct2000->start_time.secs =
|
|
pseudo_header->dct2000.wth->capture.catapult_dct2000->start_secs;
|
|
wdh->dump.dct2000->start_time.nsecs =
|
|
(pseudo_header->dct2000.wth->capture.catapult_dct2000->start_usecs * 1000);
|
|
|
|
/* Set flag do don't write header out again */
|
|
wdh->dump.dct2000->first_packet_written = TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************************/
|
|
/* Write out this packet's prefix, including calculated timestamp */
|
|
|
|
/* Look up line data prefix using stored offset */
|
|
prefix = (line_prefix_info_t*)g_hash_table_lookup(file_externals->line_header_prefixes_table,
|
|
(void*)pseudo_header->dct2000.seek_off);
|
|
|
|
/* Write out text before timestamp */
|
|
fwrite(prefix->before_time, 1, strlen(prefix->before_time), wdh->fh);
|
|
|
|
/* Calculate time of this packet to write, relative to start of dump */
|
|
if (phdr->ts.nsecs >= wdh->dump.dct2000->start_time.nsecs)
|
|
{
|
|
g_snprintf(time_string, 16, "%ld.%04d",
|
|
phdr->ts.secs - wdh->dump.dct2000->start_time.secs,
|
|
(phdr->ts.nsecs - wdh->dump.dct2000->start_time.nsecs) / 100000);
|
|
}
|
|
else
|
|
{
|
|
g_snprintf(time_string, 16, "%ld.%04u",
|
|
phdr->ts.secs - wdh->dump.dct2000->start_time.secs-1,
|
|
((1000000000 + (phdr->ts.nsecs / 100000)) - (wdh->dump.dct2000->start_time.nsecs / 100000)) % 10000);
|
|
}
|
|
|
|
/* Write out the calculated timestamp */
|
|
fwrite(time_string, 1, strlen(time_string), wdh->fh);
|
|
|
|
/* Write out text between timestamp and start of hex data */
|
|
fwrite(prefix->after_time, 1, strlen(prefix->after_time), wdh->fh);
|
|
|
|
|
|
/****************************************************************/
|
|
/* Need to skip stub header at start of pd before we reach data */
|
|
|
|
/* Context name */
|
|
for (n=0; pd[n] != '\0'; n++);
|
|
n++;
|
|
|
|
/* Context port number */
|
|
n++;
|
|
|
|
/* Timestamp */
|
|
for (; pd[n] != '\0'; n++);
|
|
n++;
|
|
|
|
/* Protocol name */
|
|
for (; pd[n] != '\0'; n++);
|
|
n++;
|
|
|
|
/* Direction & encap */
|
|
n += 2;
|
|
|
|
|
|
/**************************************/
|
|
/* Remainder is encapsulated protocol */
|
|
fwrite("$", 1, 1, wdh->fh);
|
|
|
|
/* Each binary byte is written out as 2 hex string chars */
|
|
for (; n < phdr->len; n++)
|
|
{
|
|
gchar c[2];
|
|
c[0] = char_from_hex((guchar)(pd[n] >> 4));
|
|
c[1] = char_from_hex((guchar)(pd[n] & 0x0f));
|
|
|
|
/* Write both hex chars of byte together */
|
|
fwrite(c, 1, 2, wdh->fh);
|
|
}
|
|
|
|
/* End the line */
|
|
fwrite("\n", 1, 1, wdh->fh);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************/
|
|
/* Close a file we've been writing to. */
|
|
/******************************************************/
|
|
static gboolean catapult_dct2000_dump_close(wtap_dumper *wdh _U_, int *err _U_)
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
|
|
|
|
/****************************/
|
|
/* Private helper functions */
|
|
/****************************/
|
|
|
|
/**********************************************************************/
|
|
/* Read a new line from the file, starting at offset. */
|
|
/* - writes data to static var linebuff */
|
|
/* - on return 'offset' will point to the next position to read from */
|
|
/* - return TRUE if this read is successful */
|
|
/**********************************************************************/
|
|
gboolean read_new_line(FILE_T fh, long *offset, gint *length)
|
|
{
|
|
char *result;
|
|
|
|
/* Read in a line */
|
|
result = file_gets(linebuff, MAX_LINE_LENGTH, fh);
|
|
if (result == NULL)
|
|
{
|
|
/* No characters found */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set length and offset.. */
|
|
*length = strlen(linebuff);
|
|
*offset = *offset + *length;
|
|
|
|
/* ...but don't want to include newline in line length */
|
|
if (linebuff[*length-1] == '\n')
|
|
{
|
|
linebuff[*length-1] = '\0';
|
|
*length = *length - 1;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**********************************************************************/
|
|
/* Parse a line from buffer, by identifying: */
|
|
/* - context, port and direction of packet */
|
|
/* - timestamp */
|
|
/* - data position and length */
|
|
/* Return TRUE if this packet looks valid and can be displayed */
|
|
/**********************************************************************/
|
|
gboolean parse_line(gint line_length, gint *seconds, gint *useconds,
|
|
long *before_time_offset, long *after_time_offset,
|
|
long *data_offset, gint *data_chars,
|
|
packet_direction_t *direction,
|
|
int *encap,
|
|
gboolean seek_read)
|
|
{
|
|
int n = 0;
|
|
int port_digits = 0;
|
|
char port_number_string[MAX_PORT_DIGITS+1];
|
|
int protocol_chars = 0;
|
|
|
|
char seconds_buff[MAX_SECONDS_CHARS+1];
|
|
int seconds_chars;
|
|
char subsecond_decimals_buff[MAX_SUBSECOND_DECIMALS+1];
|
|
int subsecond_decimals_chars;
|
|
|
|
gboolean atm_header_present = FALSE;
|
|
|
|
/* Read context name until find '.' */
|
|
for (n=0; linebuff[n] != '.' && (n < MAX_CONTEXT_NAME) && (n+1 < line_length); n++)
|
|
{
|
|
if (!isalnum(linebuff[n]) && (linebuff[n] != '_'))
|
|
{
|
|
return FALSE;
|
|
}
|
|
context_name[n] = linebuff[n];
|
|
}
|
|
if (n == MAX_CONTEXT_NAME || (n+1 >= line_length))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/* '.' must follow context name */
|
|
if (linebuff[n] != '.')
|
|
{
|
|
return FALSE;
|
|
}
|
|
context_name[n] = '\0';
|
|
/* Skip it */
|
|
n++;
|
|
|
|
|
|
/* Now read port number */
|
|
for (port_digits = 0;
|
|
(linebuff[n] != '/') && (port_digits <= MAX_PORT_DIGITS) && (n+1 < line_length);
|
|
n++, port_digits++)
|
|
{
|
|
if (!isdigit(linebuff[n]))
|
|
{
|
|
return FALSE;
|
|
}
|
|
port_number_string[port_digits] = linebuff[n];
|
|
}
|
|
if (port_digits > MAX_PORT_DIGITS || (n+1 >= line_length))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/* Slash char must follow port number */
|
|
if (linebuff[n] != '/')
|
|
{
|
|
return FALSE;
|
|
}
|
|
port_number_string[port_digits] = '\0';
|
|
context_port = atoi(port_number_string);
|
|
/* Skip it */
|
|
n++;
|
|
|
|
|
|
/* Now for the protocol name */
|
|
for (protocol_chars = 0;
|
|
(linebuff[n] != '/') && (protocol_chars < MAX_PROTOCOL_NAME) && (n < line_length);
|
|
n++, protocol_chars++)
|
|
{
|
|
if (!isalnum(linebuff[n]) && linebuff[n] != '_')
|
|
{
|
|
return FALSE;
|
|
}
|
|
protocol_name[protocol_chars] = linebuff[n];
|
|
}
|
|
if (protocol_chars == MAX_PROTOCOL_NAME || n >= line_length)
|
|
{
|
|
/* If doesn't fit, fail rather than truncate */
|
|
return FALSE;
|
|
}
|
|
protocol_name[protocol_chars] = '\0';
|
|
|
|
/* Slash char must follow protocol name */
|
|
if (linebuff[n] != '/')
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/******************************************************************/
|
|
/* Now check whether we know how to use a packet of this protocol */
|
|
|
|
if ((strcmp(protocol_name, "ip") == 0) || (strcmp(protocol_name, "sctp") == 0))
|
|
{
|
|
*encap = WTAP_ENCAP_RAW_IP;
|
|
}
|
|
else
|
|
|
|
/* For ATM protocols, we need to read the separate atm headerparse */
|
|
if ((strcmp(protocol_name, "fp") == 0) ||
|
|
(strcmp(protocol_name, "fp_r4") == 0) ||
|
|
(strcmp(protocol_name, "fp_r5") == 0) ||
|
|
(strcmp(protocol_name, "fp_r6") == 0))
|
|
{
|
|
*encap = WTAP_ENCAP_ATM_PDUS_UNTRUNCATED;
|
|
atm_header_present = TRUE;
|
|
}
|
|
|
|
else
|
|
if (strcmp(protocol_name, "ppp") == 0)
|
|
{
|
|
*encap = WTAP_ENCAP_PPP;
|
|
}
|
|
else
|
|
if (strcmp(protocol_name, "isdn_l3") == 0)
|
|
{
|
|
/* Despite the name, this does seem to correspond to L2... */
|
|
*encap = WTAP_ENCAP_ISDN;
|
|
}
|
|
else
|
|
if (strcmp(protocol_name, "ethernet") == 0)
|
|
{
|
|
*encap = WTAP_ENCAP_ETHERNET;
|
|
}
|
|
else
|
|
if ((strcmp(protocol_name, "saalnni_sscop") == 0) ||
|
|
(strcmp(protocol_name, "saaluni_sscop") == 0))
|
|
{
|
|
*encap = DCT2000_ENCAP_SSCOP;
|
|
}
|
|
else
|
|
if (strcmp(protocol_name, "frelay_l2") == 0)
|
|
{
|
|
*encap = WTAP_ENCAP_FRELAY;
|
|
}
|
|
else
|
|
if (strcmp(protocol_name, "ss7_mtp2") == 0)
|
|
{
|
|
*encap = DCT2000_ENCAP_MTP2;
|
|
}
|
|
else
|
|
{
|
|
/* Only reject protocol if reading for the first time and preference
|
|
setting says board ports only. This should not fail to read a
|
|
non board-port protocol on re-reading because the preference setting
|
|
has since changed...
|
|
*/
|
|
if (catapult_dct2000_board_ports_only && !seek_read)
|
|
{
|
|
return FALSE;
|
|
}
|
|
else
|
|
{
|
|
/* Not a supported protocol/encap, but should show as raw data anyway */
|
|
*encap = DCT2000_ENCAP_UNHANDLED;
|
|
}
|
|
}
|
|
|
|
|
|
/* Find separate ATM header if necessary */
|
|
if (atm_header_present)
|
|
{
|
|
int header_chars_seen = 0;
|
|
|
|
/* Scan ahead to the next $ */
|
|
for (; (linebuff[n] != '$') && (n+1 < line_length); n++);
|
|
/* Skip it */
|
|
n++;
|
|
if (n+1 >= line_length)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read consecutive hex chars into atm header buffer */
|
|
for (;
|
|
(isalnum(linebuff[n]) &&
|
|
(n < line_length) &&
|
|
(header_chars_seen < AAL_HEADER_CHARS));
|
|
n++, header_chars_seen++)
|
|
{
|
|
aal_header_chars[header_chars_seen] = linebuff[n];
|
|
}
|
|
|
|
if (header_chars_seen != AAL_HEADER_CHARS || n >= line_length)
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
/* Scan ahead to the next space */
|
|
for (; (linebuff[n] != ' ') && (n+1 < line_length); n++);
|
|
if (n+1 >= line_length)
|
|
{
|
|
return FALSE;
|
|
}
|
|
/* Skip it */
|
|
n++;
|
|
|
|
/* Next character gives direction of message (must be 's' or 'r') */
|
|
if (linebuff[n] == 's')
|
|
{
|
|
*direction = sent;
|
|
}
|
|
else
|
|
if (linebuff[n] == 'r')
|
|
{
|
|
*direction = received;
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/*********************************************************************/
|
|
/* Find and read the timestamp */
|
|
|
|
/* Now scan to the next digit, which should be the start of the timestamp */
|
|
for (; !isdigit(linebuff[n]) && (n < line_length); n++);
|
|
if (n >= line_length)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
*before_time_offset = n;
|
|
|
|
/* Seconds */
|
|
for (seconds_chars = 0;
|
|
(linebuff[n] != '.') &&
|
|
(seconds_chars <= MAX_SECONDS_CHARS) &&
|
|
(n < line_length);
|
|
n++, seconds_chars++)
|
|
{
|
|
if (!isdigit(linebuff[n]))
|
|
{
|
|
/* Found a non-digit before decimal point. Fail */
|
|
return FALSE;
|
|
}
|
|
seconds_buff[seconds_chars] = linebuff[n];
|
|
}
|
|
if (seconds_chars > MAX_SECONDS_CHARS || n >= line_length)
|
|
{
|
|
/* Didn't fit in buffer. Fail rather than use truncated */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Convert found value into number */
|
|
seconds_buff[seconds_chars] = '\0';
|
|
*seconds = atoi(seconds_buff);
|
|
|
|
/* The decimal point must follow the last of the seconds digits */
|
|
if (linebuff[n] != '.')
|
|
{
|
|
return FALSE;
|
|
}
|
|
/* Skip it */
|
|
n++;
|
|
|
|
/* Subsecond decimal digits (expect 4-digit accuracy) */
|
|
for (subsecond_decimals_chars = 0;
|
|
(linebuff[n] != ' ') &&
|
|
(subsecond_decimals_chars <= MAX_SUBSECOND_DECIMALS) &&
|
|
(n < line_length);
|
|
n++, subsecond_decimals_chars++)
|
|
{
|
|
if (!isdigit(linebuff[n]))
|
|
{
|
|
return FALSE;
|
|
}
|
|
subsecond_decimals_buff[subsecond_decimals_chars] = linebuff[n];
|
|
}
|
|
if (subsecond_decimals_chars > MAX_SUBSECOND_DECIMALS || n >= line_length)
|
|
{
|
|
/* More numbers than expected - give up */
|
|
return FALSE;
|
|
}
|
|
/* Convert found value into microseconds */
|
|
subsecond_decimals_buff[subsecond_decimals_chars] = '\0';
|
|
*useconds = atoi(subsecond_decimals_buff) * 100;
|
|
|
|
/* Space character must follow end of timestamp */
|
|
if (linebuff[n] != ' ')
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
*after_time_offset = n;
|
|
|
|
/* Now skip ahead to find start of data (marked by '$') */
|
|
for (; (linebuff[n] != '$') && (n+1 < line_length); n++);
|
|
if (n+1 >= line_length)
|
|
{
|
|
return FALSE;
|
|
}
|
|
/* Skip it */
|
|
n++;
|
|
|
|
/* Set offset to data start within line */
|
|
*data_offset = n;
|
|
|
|
/* Set number of chars that comprise the hex string protocol data */
|
|
*data_chars = line_length - n;
|
|
|
|
/* Need to skip first byte (2 hex string chars) from ISDN messages.
|
|
TODO: find out what this byte means...
|
|
*/
|
|
if (*encap == WTAP_ENCAP_ISDN)
|
|
{
|
|
*data_offset += 2;
|
|
*data_chars -= 2;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**************************************************************/
|
|
/* Set pseudo-header info depending upon packet encapsulation */
|
|
/**************************************************************/
|
|
void set_pseudo_header_info(wtap *wth,
|
|
int pkt_encap,
|
|
long file_offset,
|
|
union wtap_pseudo_header *pseudo_header,
|
|
gint length,
|
|
packet_direction_t direction)
|
|
{
|
|
pseudo_header->dct2000.seek_off = file_offset;
|
|
pseudo_header->dct2000.wth = wth;
|
|
|
|
switch (pkt_encap)
|
|
{
|
|
case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
|
|
set_aal_info(pseudo_header, length, direction);
|
|
break;
|
|
case WTAP_ENCAP_ISDN:
|
|
set_isdn_info(pseudo_header, direction);
|
|
break;
|
|
case WTAP_ENCAP_PPP:
|
|
set_ppp_info(pseudo_header, direction);
|
|
break;
|
|
|
|
default:
|
|
/* Other supported types don't need to set anything here... */
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*********************************************/
|
|
/* Fill in atm pseudo-header with known info */
|
|
/*********************************************/
|
|
void set_aal_info(union wtap_pseudo_header *pseudo_header, gint length,
|
|
packet_direction_t direction)
|
|
{
|
|
/* 'aal_head_chars' has this format (for AAL2 at least):
|
|
Global Flow Control (4 bits) | VPI (8 bits) | VCI (16 bits) |
|
|
Payload Type (4 bits) | Padding (3 bits?) | Link? (1 bit) |
|
|
Channel Identifier (8 bits) | ...
|
|
*/
|
|
|
|
/* Indicate that this is a reassembled PDU */
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.flags = 0x00;
|
|
|
|
/* Channel 0 is DTE->DCE, 1 is DCE->DTE. Always set 0 for now.
|
|
TODO: Can we infer the correct value here?
|
|
Meanwhile, just use the direction to make them distinguishable...
|
|
*/
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.channel = (direction == received);
|
|
|
|
/* Assume always AAL2 for FP */
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.aal = AAL_2;
|
|
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.type = TRAF_UNKNOWN;
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.subtype = TRAF_ST_UNKNOWN;
|
|
|
|
/* vpi is 8 bits (2nd & 3rd nibble) */
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.vpi =
|
|
((hex_from_char(aal_header_chars[1]) << 4) |
|
|
hex_from_char(aal_header_chars[2]));
|
|
|
|
/* vci is next 16 bits */
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.vci =
|
|
((hex_from_char(aal_header_chars[3]) << 12) |
|
|
(hex_from_char(aal_header_chars[4]) << 8) |
|
|
(hex_from_char(aal_header_chars[5]) << 4) |
|
|
hex_from_char(aal_header_chars[6]));
|
|
|
|
/* 0 means we don't know how many cells the frame comprises. */
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.cells = 0;
|
|
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.aal5t_u2u = 0;
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.aal5t_len = length;
|
|
pseudo_header->dct2000.inner_pseudo_header.atm.aal5t_chksum = 0;
|
|
}
|
|
|
|
|
|
/**********************************************/
|
|
/* Fill in isdn pseudo-header with known info */
|
|
/**********************************************/
|
|
void set_isdn_info(union wtap_pseudo_header *pseudo_header,
|
|
packet_direction_t direction)
|
|
{
|
|
/* This field is used to set the 'Source' and 'Destination' columns to
|
|
'User' or 'Network'. If we assume that we're simulating the network,
|
|
treat Received messages as being destined for the network.
|
|
*/
|
|
pseudo_header->dct2000.inner_pseudo_header.isdn.uton = (direction == received);
|
|
|
|
/* This corresponds to the circuit ID. 0 is treated as LAPD,
|
|
everything else would be treated as a B-channel
|
|
*/
|
|
pseudo_header->dct2000.inner_pseudo_header.isdn.channel = 0;
|
|
}
|
|
|
|
|
|
/*********************************************/
|
|
/* Fill in ppp pseudo-header with known info */
|
|
/*********************************************/
|
|
static void set_ppp_info(union wtap_pseudo_header *pseudo_header,
|
|
packet_direction_t direction)
|
|
{
|
|
/* Set direction. */
|
|
pseudo_header->dct2000.inner_pseudo_header.p2p.sent = (direction == sent);
|
|
}
|
|
|
|
|
|
/********************************************************/
|
|
/* Return hex nibble equivalent of hex string character */
|
|
/********************************************************/
|
|
guchar hex_from_char(gchar c)
|
|
{
|
|
if ((c >= '0') && (c <= '9'))
|
|
{
|
|
return c - '0';
|
|
}
|
|
|
|
if ((c >= 'a') && (c <= 'f'))
|
|
{
|
|
return 0x0a + (c - 'a');
|
|
}
|
|
|
|
/* Not a valid hex string character */
|
|
return 0xff;
|
|
}
|
|
|
|
|
|
/********************************************************/
|
|
/* Return character corresponding to hex nibble value */
|
|
/********************************************************/
|
|
gchar char_from_hex(guchar hex)
|
|
{
|
|
static char hex_lookup[16] =
|
|
{ '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
|
|
|
|
if (hex > 15)
|
|
{
|
|
return '?';
|
|
}
|
|
|
|
return hex_lookup[hex];
|
|
}
|
|
|
|
|
|
/********************************************/
|
|
/* Equality test for line-prefix hash table */
|
|
/********************************************/
|
|
gint prefix_equal(gconstpointer v, gconstpointer v2)
|
|
{
|
|
return (v == v2);
|
|
}
|
|
|
|
|
|
/********************************************/
|
|
/* Hash function for line-prefix hash table */
|
|
/********************************************/
|
|
guint prefix_hash_func(gconstpointer v)
|
|
{
|
|
/* Just use pointer itself (is actually byte offset of line in file) */
|
|
return (guint)v;
|
|
}
|
|
|
|
|
|
/************************************************************************/
|
|
/* Parse year, month, day, hour, minute, seconds out of formatted line. */
|
|
/* Set secs and usecs as output */
|
|
/* Return FALSE if no valid time can be read */
|
|
/************************************************************************/
|
|
gboolean get_file_time_stamp(time_t *secs, guint32 *usecs)
|
|
{
|
|
int n;
|
|
struct tm tm;
|
|
#define MAX_MONTH_LETTERS 9
|
|
char month[MAX_MONTH_LETTERS+1];
|
|
|
|
int day, year, hour, minute, second;
|
|
int scan_found;
|
|
|
|
/* If line longer than expected, file is probably not correctly formatted */
|
|
if (strlen(linebuff) > MAX_TIMESTAMP_LINE_LENGTH)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* First is month. Read until get a space following the month */
|
|
for (n=0; (linebuff[n] != ' ') && (n < MAX_MONTH_LETTERS); n++)
|
|
{
|
|
month[n] = linebuff[n];
|
|
}
|
|
month[n] = '\0';
|
|
|
|
if (strcmp(month, "January" ) == 0) tm.tm_mon = 0;
|
|
else if (strcmp(month, "February" ) == 0) tm.tm_mon = 1;
|
|
else if (strcmp(month, "March" ) == 0) tm.tm_mon = 2;
|
|
else if (strcmp(month, "April" ) == 0) tm.tm_mon = 3;
|
|
else if (strcmp(month, "May" ) == 0) tm.tm_mon = 4;
|
|
else if (strcmp(month, "June" ) == 0) tm.tm_mon = 5;
|
|
else if (strcmp(month, "July" ) == 0) tm.tm_mon = 6;
|
|
else if (strcmp(month, "August" ) == 0) tm.tm_mon = 7;
|
|
else if (strcmp(month, "September") == 0) tm.tm_mon = 8;
|
|
else if (strcmp(month, "October" ) == 0) tm.tm_mon = 9;
|
|
else if (strcmp(month, "November" ) == 0) tm.tm_mon = 10;
|
|
else if (strcmp(month, "December" ) == 0) tm.tm_mon = 11;
|
|
else
|
|
{
|
|
/* Give up if not found a properly-formatted date */
|
|
return FALSE;
|
|
}
|
|
/* Skip space char */
|
|
n++;
|
|
|
|
/********************************************************/
|
|
/* Scan for remaining numerical fields */
|
|
scan_found = sscanf(linebuff+n, "%d, %d %d:%d:%d.%u",
|
|
&day, &year, &hour, &minute, &second, usecs);
|
|
if (scan_found != 6)
|
|
{
|
|
/* Give up if not all found */
|
|
return FALSE;
|
|
}
|
|
|
|
/******************************************************/
|
|
/* Fill in remaining fields and return it in a time_t */
|
|
tm.tm_year = year - 1900;
|
|
tm.tm_mday = day;
|
|
tm.tm_hour = hour;
|
|
tm.tm_min = minute;
|
|
tm.tm_sec = second;
|
|
tm.tm_isdst = -1; /* daylight saving time info not known */
|
|
|
|
/* Get seconds from this time */
|
|
*secs = mktime(&tm);
|
|
|
|
/* Multiply 4 digits given to get micro-seconds */
|
|
*usecs = *usecs * 100;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Free the data allocated inside a line_prefix_info_t */
|
|
gboolean free_line_prefix_info(gpointer key _U_, gpointer value,
|
|
gpointer user_data _U_)
|
|
{
|
|
line_prefix_info_t *info = (line_prefix_info_t*)value;
|
|
|
|
/* Free the strings inside */
|
|
g_free(info->before_time);
|
|
g_free(info->after_time);
|
|
|
|
/* And the structure itself */
|
|
g_free(info);
|
|
|
|
/* Item will always be removed from table */
|
|
return TRUE;
|
|
}
|
|
|