![Guy Harris](/assets/img/avatar_default.png)
same. Add to wiretap/pcap-common.c a routine to fill in the pseudo-header for ATM (by looking at the VPI, VCI, and packet data, and guessing) and Ethernet (setting the FCS length appropriately). Use it for both pcap and pcap-ng files. svn path=/trunk/; revision=38840
469 lines
12 KiB
C
469 lines
12 KiB
C
/* radcom.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 "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "radcom.h"
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struct frame_date {
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guint16 year;
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guint8 month;
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guint8 day;
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guint32 sec; /* seconds since midnight */
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guint32 usec;
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};
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struct unaligned_frame_date {
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char year[2];
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char month;
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char day;
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char sec[4]; /* seconds since midnight */
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char usec[4];
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};
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/* Found at the beginning of the file. Bytes 2 and 3 (D2:00) seem to be
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* different in some captures */
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static const guint8 radcom_magic[8] = {
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0x42, 0xD2, 0x00, 0x34, 0x12, 0x66, 0x22, 0x88
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};
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static const guint8 encap_magic[4] = {
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0x00, 0x42, 0x43, 0x09
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};
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static const guint8 active_time_magic[11] = {
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0x41, 0x63, 0x74, 0x69, 0x76, 0x65, 0x20, 0x54, 0x69, 0x6d, 0x65
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};
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/* RADCOM record header - followed by frame data (perhaps including FCS).
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"data_length" appears to be the length of packet data following
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the record header. It's 0 in the last record.
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"length" appears to be the amount of captured packet data, and
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"real_length" might be the actual length of the frame on the wire -
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in some captures, it's the same as "length", and, in others,
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it's greater than "length". In the last record, however, those
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may have bogus values (or is that some kind of trailer record?).
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"xxx" appears to be all-zero in all but the last record in one
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capture; if so, perhaps this indicates that the last record is,
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in fact, a trailer of some sort, and some field in the header
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is a record type. */
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struct radcomrec_hdr {
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char xxx[4]; /* unknown */
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char data_length[2]; /* packet length? */
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char xxy[5]; /* unknown */
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struct unaligned_frame_date date; /* date/time stamp of packet */
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char real_length[2]; /* actual length of packet */
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char length[2]; /* captured length of packet */
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char xxz[2]; /* unknown */
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char dce; /* DCE/DTE flag (and other flags?) */
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char xxw[9]; /* unknown */
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};
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static gboolean radcom_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean radcom_seek_read(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
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int *err, gchar **err_info);
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static int radcom_read_rec_header(FILE_T fh, struct radcomrec_hdr *hdr,
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int *err, gchar **err_info);
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static gboolean radcom_read_rec_data(FILE_T fh, guint8 *pd, int length,
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int *err, gchar **err_info);
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int radcom_open(wtap *wth, int *err, gchar **err_info)
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{
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int bytes_read;
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guint8 r_magic[8], t_magic[11], search_encap[7];
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struct frame_date start_date;
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#if 0
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guint32 sec;
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struct tm tm;
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#endif
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/* Read in the string that should be at the start of a RADCOM file */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(r_magic, 8, wth->fh);
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if (bytes_read != 8) {
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*err = file_error(wth->fh, err_info);
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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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/* XXX: bytes 2 and 3 of the "magic" header seem to be different in some
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* captures. We force them to our standard value so that the test
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* succeeds (until we find if they have a special meaning, perhaps a
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* version number ?) */
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r_magic[1] = 0xD2;
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r_magic[2] = 0x00;
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if (memcmp(r_magic, radcom_magic, 8) != 0) {
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return 0;
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}
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/* Look for the "Active Time" string. The "frame_date" structure should
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* be located 32 bytes before the beginning of this string */
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wth->data_offset = 8;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(t_magic, 11, wth->fh);
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if (bytes_read != 11) {
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*err = file_error(wth->fh, err_info);
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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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while (memcmp(t_magic, active_time_magic, 11) != 0)
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{
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if (file_seek(wth->fh, -10, SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset += 1;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(t_magic, 11, wth->fh);
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if (bytes_read != 11) {
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*err = file_error(wth->fh, err_info);
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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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}
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if (file_seek(wth->fh, -43, SEEK_CUR, err) == -1) return -1;
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wth->data_offset -= 32;
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/* Get capture start time */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&start_date, sizeof(struct frame_date),
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wth->fh);
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if (bytes_read != sizeof(struct frame_date)) {
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*err = file_error(wth->fh, err_info);
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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 += sizeof(struct frame_date);
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/* This is a radcom file */
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wth->file_type = WTAP_FILE_RADCOM;
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wth->subtype_read = radcom_read;
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wth->subtype_seek_read = radcom_seek_read;
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wth->snapshot_length = 0; /* not available in header, only in frame */
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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#if 0
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tm.tm_year = pletohs(&start_date.year)-1900;
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tm.tm_mon = start_date.month-1;
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tm.tm_mday = start_date.day;
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sec = pletohl(&start_date.sec);
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tm.tm_hour = sec/3600;
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tm.tm_min = (sec%3600)/60;
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tm.tm_sec = sec%60;
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tm.tm_isdst = -1;
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#endif
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if (file_seek(wth->fh, sizeof(struct frame_date), SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset += sizeof(struct frame_date);
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(search_encap, 4, wth->fh);
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if (bytes_read != 4) {
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goto read_error;
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}
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wth->data_offset += 4;
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while (memcmp(encap_magic, search_encap, 4)) {
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if (file_seek(wth->fh, -3, SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset -= 3;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(search_encap, 4, wth->fh);
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if (bytes_read != 4) {
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goto read_error;
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}
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wth->data_offset += 4;
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}
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if (file_seek(wth->fh, 12, SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset += 12;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(search_encap, 4, wth->fh);
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if (bytes_read != 4) {
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goto read_error;
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}
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wth->data_offset += 4;
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if (memcmp(search_encap, "LAPB", 4) == 0)
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wth->file_encap = WTAP_ENCAP_LAPB;
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else if (memcmp(search_encap, "Ethe", 4) == 0)
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wth->file_encap = WTAP_ENCAP_ETHERNET;
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else if (memcmp(search_encap, "ATM/", 4) == 0)
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wth->file_encap = WTAP_ENCAP_ATM_RFC1483;
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else {
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*err = WTAP_ERR_UNSUPPORTED_ENCAP;
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*err_info = g_strdup_printf("radcom: network type \"%.4s\" unknown", search_encap);
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return -1;
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}
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#if 0
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bytes_read = file_read(&next_date, sizeof(struct frame_date), wth->fh);
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errno = WTAP_ERR_CANT_READ;
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if (bytes_read != sizeof(struct frame_date)) {
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goto read_error;
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}
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while (memcmp(&start_date, &next_date, 4)) {
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if (file_seek(wth->fh, 1-sizeof(struct frame_date), SEEK_CUR, err) == -1)
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return -1;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&next_date, sizeof(struct frame_date),
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wth->fh);
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if (bytes_read != sizeof(struct frame_date)) {
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goto read_error;
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}
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}
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#endif
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if (wth->file_encap == WTAP_ENCAP_ETHERNET) {
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if (file_seek(wth->fh, 294, SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset += 294;
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} else if (wth->file_encap == WTAP_ENCAP_LAPB) {
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if (file_seek(wth->fh, 297, SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset += 297;
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} else if (wth->file_encap == WTAP_ENCAP_ATM_RFC1483) {
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if (file_seek(wth->fh, 504, SEEK_CUR, err) == -1)
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return -1;
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wth->data_offset += 504;
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}
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return 1;
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read_error:
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*err = file_error(wth->fh, err_info);
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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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/* Read the next packet */
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static gboolean radcom_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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int ret;
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struct radcomrec_hdr hdr;
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guint16 data_length, real_length, length;
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guint32 sec;
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int bytes_read;
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struct tm tm;
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guint8 phdr[8];
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char fcs[2];
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/* Read record header. */
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*data_offset = wth->data_offset;
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ret = radcom_read_rec_header(wth->fh, &hdr, err, err_info);
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if (ret <= 0) {
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/* Read error or EOF */
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return FALSE;
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}
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wth->data_offset += sizeof hdr;
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data_length = pletohs(&hdr.data_length);
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if (data_length == 0) {
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/*
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* The last record appears to have 0 in its "data_length"
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* field, but non-zero values in other fields, so we
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* check for that and treat it as an EOF indication.
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*/
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*err = 0;
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return FALSE;
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}
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length = pletohs(&hdr.length);
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real_length = pletohs(&hdr.real_length);
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if (wth->file_encap == WTAP_ENCAP_LAPB) {
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length -= 2; /* FCS */
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real_length -= 2;
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}
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wth->phdr.len = real_length;
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wth->phdr.caplen = length;
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tm.tm_year = pletohs(&hdr.date.year)-1900;
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tm.tm_mon = (hdr.date.month&0x0f)-1;
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tm.tm_mday = hdr.date.day;
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sec = pletohl(&hdr.date.sec);
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tm.tm_hour = sec/3600;
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tm.tm_min = (sec%3600)/60;
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tm.tm_sec = sec%60;
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tm.tm_isdst = -1;
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wth->phdr.ts.secs = mktime(&tm);
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wth->phdr.ts.nsecs = pletohl(&hdr.date.usec) * 1000;
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switch (wth->file_encap) {
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case WTAP_ENCAP_ETHERNET:
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/* XXX - is there an FCS? */
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wth->pseudo_header.eth.fcs_len = -1;
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break;
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case WTAP_ENCAP_LAPB:
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wth->pseudo_header.x25.flags = (hdr.dce & 0x1) ?
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0x00 : FROM_DCE;
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break;
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case WTAP_ENCAP_ATM_RFC1483:
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/*
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* XXX - is this stuff a pseudo-header?
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* The direction appears to be in the "hdr.dce" field.
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*/
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if (!radcom_read_rec_data(wth->fh, phdr, sizeof phdr, err,
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err_info))
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return FALSE; /* Read error */
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wth->data_offset += 8;
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length -= 8;
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wth->phdr.len -= 8;
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wth->phdr.caplen -= 8;
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break;
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}
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/*
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* Read the packet data.
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*/
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buffer_assure_space(wth->frame_buffer, length);
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if (!radcom_read_rec_data(wth->fh,
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buffer_start_ptr(wth->frame_buffer), length, err, err_info))
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return FALSE; /* Read error */
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wth->data_offset += length;
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if (wth->file_encap == WTAP_ENCAP_LAPB) {
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/* Read the FCS.
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XXX - should we have some way of indicating the
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presence and size of an FCS to our caller?
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That'd let us handle other file types as well. */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&fcs, sizeof fcs, wth->fh);
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if (bytes_read != sizeof fcs) {
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*err = file_error(wth->fh, err_info);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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wth->data_offset += sizeof fcs;
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}
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return TRUE;
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}
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static gboolean
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radcom_seek_read(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
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int *err, gchar **err_info)
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{
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int ret;
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struct radcomrec_hdr hdr;
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guint8 phdr[8];
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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/* Read record header. */
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ret = radcom_read_rec_header(wth->random_fh, &hdr, err, err_info);
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if (ret <= 0) {
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/* Read error or EOF */
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if (ret == 0) {
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/* EOF means "short read" in random-access mode */
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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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switch (wth->file_encap) {
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case WTAP_ENCAP_ETHERNET:
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/* XXX - is there an FCS? */
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pseudo_header->eth.fcs_len = -1;
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break;
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case WTAP_ENCAP_LAPB:
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pseudo_header->x25.flags = (hdr.dce & 0x1) ? 0x00 : FROM_DCE;
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break;
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case WTAP_ENCAP_ATM_RFC1483:
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/*
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* XXX - is this stuff a pseudo-header?
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* The direction appears to be in the "hdr.dce" field.
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*/
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if (!radcom_read_rec_data(wth->random_fh, phdr, sizeof phdr,
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err, err_info))
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return FALSE; /* Read error */
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break;
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}
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/*
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* Read the packet data.
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*/
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return radcom_read_rec_data(wth->random_fh, pd, length, err, err_info);
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}
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static int
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radcom_read_rec_header(FILE_T fh, struct radcomrec_hdr *hdr, int *err,
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gchar **err_info)
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{
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int bytes_read;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(hdr, sizeof *hdr, fh);
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if (bytes_read != sizeof *hdr) {
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*err = file_error(fh, err_info);
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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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return 1;
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}
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static gboolean
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radcom_read_rec_data(FILE_T fh, guint8 *pd, int length, int *err,
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gchar **err_info)
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{
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int bytes_read;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(pd, length, fh);
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if (bytes_read != length) {
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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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return FALSE;
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}
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return TRUE;
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}
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