![Guy Harris](/assets/img/avatar_default.png)
from the frame table - Network Monitor 2.x, at least, doesn't always write frame N+1 right after frame N. To do that, we need to mallocate a big array to hold the frame table, and free it when we close the capture file; this requires that we have capture-file-type-specific close routines as well as capture-file-type-specific read routines - we let it the pointer to that routine be null if it's not needed. Given that, we might as well get rid of the switch statement in "wtap_close()", in favor of using capture-file-type-specific close routines, as per the comment before that switch statement. svn path=/trunk/; revision=1740
305 lines
8.5 KiB
C
305 lines
8.5 KiB
C
/* lanalyzer.c
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*
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* $Id: lanalyzer.c,v 1.21 2000/03/22 07:06:58 guy Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.org>
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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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*/
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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 <stdlib.h>
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#include <errno.h>
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#include <time.h>
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#include "wtap.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "lanalyzer.h"
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/* The LANalyzer format is documented (at least in part) in Novell document
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TID022037, which can be found at, among other places:
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http://www.hackzone.ru/nsp/info/nw/lan/trace.txt
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*/
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/* Record types. */
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#define REC_TRACE_HEADER 0x1001
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#define REC_CYCLIC_TRACE_HEADER 0x1007
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#define REC_TRACE_SUMMARY 0x1002
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#define REC_TRACE_PACKET_DATA 0x1005
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/* LANalyzer board types (which indicate the type of network on which
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the capture was done). */
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#define BOARD_325 226 /* LANalyzer 325 (Ethernet) */
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#define BOARD_325TR 227 /* LANalyzer 325TR (Token-ring) */
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static int lanalyzer_read(wtap *wth, int *err);
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static void lanalyzer_close(wtap *wth);
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int lanalyzer_open(wtap *wth, int *err)
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{
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int bytes_read;
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char LE_record_type[2];
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char LE_record_length[2];
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char summary[210];
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guint16 board_type, mxslc;
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guint16 record_type, record_length;
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guint8 cr_day, cr_month, cr_year;
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struct tm tm;
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file_seek(wth->fh, 0, SEEK_SET);
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wth->data_offset = 0;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(LE_record_type, 1, 2, wth->fh);
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bytes_read += file_read(LE_record_length, 1, 2, wth->fh);
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if (bytes_read != 4) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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return 0;
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}
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wth->data_offset += 4;
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record_type = pletohs(LE_record_type);
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record_length = pletohs(LE_record_length); /* make sure to do this for while() loop */
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if (record_type != REC_TRACE_HEADER && record_type != REC_CYCLIC_TRACE_HEADER) {
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return 0;
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}
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/* If we made it this far, then the file is a LANAlyzer file.
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* Let's get some info from it. Note that we get wth->snapshot_length
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* from a record later in the file. */
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wth->file_type = WTAP_FILE_LANALYZER;
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wth->capture.lanalyzer = g_malloc(sizeof(lanalyzer_t));
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wth->subtype_read = lanalyzer_read;
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wth->subtype_close = lanalyzer_close;
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wth->snapshot_length = 0;
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/* Read records until we find the start of packets */
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while (1) {
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file_seek(wth->fh, record_length, SEEK_CUR);
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wth->data_offset += record_length;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(LE_record_type, 1, 2, wth->fh);
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bytes_read += file_read(LE_record_length, 1, 2, wth->fh);
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if (bytes_read != 4) {
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*err = file_error(wth->fh);
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if (*err != 0) {
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g_free(wth->capture.lanalyzer);
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return -1;
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}
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g_free(wth->capture.lanalyzer);
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return 0;
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}
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wth->data_offset += 4;
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record_type = pletohs(LE_record_type);
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record_length = pletohs(LE_record_length);
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/*g_message("Record 0x%04X Length %d", record_type, record_length);*/
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switch (record_type) {
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/* Trace Summary Record */
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case REC_TRACE_SUMMARY:
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(summary, 1, sizeof summary,
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wth->fh);
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if (bytes_read != sizeof summary) {
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*err = file_error(wth->fh);
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if (*err != 0) {
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g_free(wth->capture.lanalyzer);
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return -1;
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}
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g_free(wth->capture.lanalyzer);
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return 0;
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}
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wth->data_offset += sizeof summary;
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/* Assume that the date of the creation of the trace file
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* is the same date of the trace. Lanalyzer doesn't
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* store the creation date/time of the trace, but only of
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* the file. Unless you traced at 11:55 PM and saved at 00:05
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* AM, the assumption that trace.date == file.date is true.
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*/
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cr_day = summary[0];
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cr_month = summary[1];
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cr_year = pletohs(&summary[2]);
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/*g_message("Day %d Month %d Year %d (%04X)", cr_day, cr_month,
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cr_year, cr_year);*/
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/* Get capture start time. I learned how to do
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* this from Guy's code in ngsniffer.c
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*/
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/* this strange year offset is not in the
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* lanalyzer file format documentation, but it
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* works. */
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tm.tm_year = cr_year - (1900 - 1792);
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tm.tm_mon = cr_month - 1;
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tm.tm_mday = cr_day;
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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wth->capture.lanalyzer->start = mktime(&tm);
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/*g_message("Day %d Month %d Year %d", tm.tm_mday,
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tm.tm_mon, tm.tm_year);*/
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mxslc = pletohs(&summary[30]);
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wth->snapshot_length = mxslc;
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record_length = 0; /* to fake the next iteration of while() */
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board_type = pletohs(&summary[188]);
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switch (board_type) {
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case BOARD_325:
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wth->file_encap = WTAP_ENCAP_ETHERNET;
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break;
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case BOARD_325TR:
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wth->file_encap = WTAP_ENCAP_TR;
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break;
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default:
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g_message("lanalyzer: board type %u unknown",
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board_type);
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g_free(wth->capture.lanalyzer);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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break;
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/* Trace Packet Data Record */
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case REC_TRACE_PACKET_DATA:
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/* Go back header number ob ytes so that lanalyzer_read
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* can read this header */
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file_seek(wth->fh, -bytes_read, SEEK_CUR);
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wth->data_offset -= bytes_read;
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return 1;
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default:
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; /* no action */
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}
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}
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/* never gets here */
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g_assert_not_reached();
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return 0;
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}
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#define DESCRIPTOR_LEN 32
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/* Read the next packet */
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static int lanalyzer_read(wtap *wth, int *err)
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{
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int packet_size = 0;
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int bytes_read;
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char LE_record_type[2];
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char LE_record_length[2];
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guint16 record_type, record_length;
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gchar descriptor[DESCRIPTOR_LEN];
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int data_offset;
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guint16 time_low, time_med, time_high, true_size;
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double t;
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/* read the record type and length. */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(LE_record_type, 1, 2, wth->fh);
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if (bytes_read != 2) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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if (bytes_read != 0) {
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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return 0;
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}
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wth->data_offset += 2;
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bytes_read = file_read(LE_record_length, 1, 2, wth->fh);
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if (bytes_read != 2) {
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*err = file_error(wth->fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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wth->data_offset += 2;
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record_type = pletohs(LE_record_type);
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record_length = pletohs(LE_record_length);
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/* Only Trace Packet Data Records should occur now that we're in
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* the middle of reading packets. If any other record type exists
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* after a Trace Packet Data Record, mark it as an error. */
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if (record_type != REC_TRACE_PACKET_DATA) {
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g_message("lanalyzer: record type %u seen after trace summary record",
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record_type);
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*err = WTAP_ERR_BAD_RECORD;
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return -1;
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}
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else {
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packet_size = record_length - DESCRIPTOR_LEN;
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}
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/* Read the descriptor data */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(descriptor, 1, DESCRIPTOR_LEN, wth->fh);
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if (bytes_read != DESCRIPTOR_LEN) {
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*err = file_error(wth->fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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wth->data_offset += DESCRIPTOR_LEN;
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/* Read the packet data */
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buffer_assure_space(wth->frame_buffer, packet_size);
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data_offset = wth->data_offset;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(buffer_start_ptr(wth->frame_buffer), 1,
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packet_size, wth->fh);
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if (bytes_read != packet_size) {
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*err = file_error(wth->fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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wth->data_offset += packet_size;
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true_size = pletohs(&descriptor[4]);
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time_low = pletohs(&descriptor[8]);
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time_med = pletohs(&descriptor[10]);
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time_high = pletohs(&descriptor[12]);
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t = (double)time_low+(double)(time_med)*65536.0 +
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(double)time_high*4294967296.0;
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t = t/1000000.0 * 0.5; /* t = # of secs */
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t += wth->capture.lanalyzer->start;
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wth->phdr.ts.tv_sec = (long)t;
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wth->phdr.ts.tv_usec = (unsigned long)((t-(double)(wth->phdr.ts.tv_sec))
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*1.0e6);
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wth->phdr.len = true_size - 4;
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wth->phdr.caplen = packet_size;
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wth->phdr.pkt_encap = wth->file_encap;
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return data_offset;
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}
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static void
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lanalyzer_close(wtap *wth)
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{
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g_free(wth->capture.lanalyzer);
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}
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