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wireshark/wiretap/radcom.c

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/* radcom.c
*
* $Id: radcom.c,v 1.31 2001/11/13 23:55:44 gram Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "buffer.h"
#include "radcom.h"
struct frame_date {
guint16 year;
guint8 month;
guint8 day;
guint32 sec; /* seconds since midnight */
guint32 usec;
};
struct unaligned_frame_date {
char year[2];
char month;
char day;
char sec[4]; /* seconds since midnight */
char usec[4];
};
static guint8 radcom_magic[8] = {
0x42, 0xD2, 0x00, 0x34, 0x12, 0x66, 0x22, 0x88
};
/* RADCOM record header - followed by frame data (perhaps including FCS).
The first two bytes of "xxz" appear to equal "length", as do the
second two bytes; if a RADCOM box can be told not to save all of
the captured packet, might one or the other of those be the
captured length of the packet? */
struct radcomrec_hdr {
char xxx[4]; /* unknown */
char length[2]; /* packet length */
char xxy[5]; /* unknown */
struct unaligned_frame_date date; /* date/time stamp of packet */
char xxz[6]; /* unknown */
char dce; /* DCE/DTE flag (and other flags?) */
char xxw[9]; /* unknown */
};
static gboolean radcom_read(wtap *wth, int *err, long *data_offset);
static int radcom_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, u_char *pd, int length);
static int radcom_read_rec_header(FILE_T fh, struct radcomrec_hdr *hdr,
int *err);
static int radcom_read_rec_data(FILE_T fh, u_char *pd, int length, int *err);
int radcom_open(wtap *wth, int *err)
{
int bytes_read;
char magic[8];
struct frame_date start_date;
guint32 sec;
struct tm tm;
char byte;
char encap_magic[4] = {0x00, 0x42, 0x43, 0x09};
char search_encap[7];
/* Read in the string that should be at the start of a RADCOM file */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(magic, 1, 8, wth->fh);
if (bytes_read != 8) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
if (memcmp(magic, radcom_magic, 8) != 0) {
return 0;
}
file_seek(wth->fh, 0x8B, SEEK_SET);
wth->data_offset = 0x8B;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&byte, 1, 1, wth->fh);
if (bytes_read != 1) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += 1;
while (byte) {
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&byte, 1, 1, wth->fh);
if (bytes_read != 1) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += 1;
}
/* Get capture start time */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&start_date, 1, sizeof(struct frame_date), wth->fh);
if (bytes_read != sizeof(struct frame_date)) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += sizeof(struct frame_date);
/* This is a radcom file */
wth->file_type = WTAP_FILE_RADCOM;
wth->subtype_read = radcom_read;
wth->subtype_seek_read = radcom_seek_read;
wth->snapshot_length = 16384; /* not available in header, only in frame */
tm.tm_year = pletohs(&start_date.year)-1900;
tm.tm_mon = start_date.month-1;
tm.tm_mday = start_date.day;
sec = pletohl(&start_date.sec);
tm.tm_hour = sec/3600;
tm.tm_min = (sec%3600)/60;
tm.tm_sec = sec%60;
tm.tm_isdst = -1;
file_seek(wth->fh, sizeof(struct frame_date), SEEK_CUR);
wth->data_offset += sizeof(struct frame_date);
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(search_encap, 1, 4, wth->fh);
if (bytes_read != 4) {
goto read_error;
}
wth->data_offset += 4;
while (memcmp(encap_magic, search_encap, 4)) {
file_seek(wth->fh, -3, SEEK_CUR);
wth->data_offset -= 3;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(search_encap, 1, 4, wth->fh);
if (bytes_read != 4) {
goto read_error;
}
wth->data_offset += 4;
}
file_seek(wth->fh, 12, SEEK_CUR);
wth->data_offset += 12;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(search_encap, 1, 4, wth->fh);
if (bytes_read != 4) {
goto read_error;
}
wth->data_offset += 4;
if (!memcmp(search_encap, "LAPB", 4))
wth->file_encap = WTAP_ENCAP_LAPB;
else if (!memcmp(search_encap, "Ethe", 4))
wth->file_encap = WTAP_ENCAP_ETHERNET;
else {
g_message("pcap: network type \"%.4s\" unknown", search_encap);
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
return -1;
}
/*bytes_read = file_read(&next_date, 1, sizeof(struct frame_date), wth->fh);
errno = WTAP_ERR_CANT_READ;
if (bytes_read != sizeof(struct frame_date)) {
goto read_error;
}
while (memcmp(&start_date, &next_date, 4)) {
file_seek(wth->fh, 1-sizeof(struct frame_date), SEEK_CUR);
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&next_date, 1, sizeof(struct frame_date),
wth->fh);
if (bytes_read != sizeof(struct frame_date)) {
goto read_error;
}
}*/
if (wth->file_encap == WTAP_ENCAP_ETHERNET) {
file_seek(wth->fh, 294, SEEK_CUR);
wth->data_offset += 294;
} else if (wth->file_encap == WTAP_ENCAP_LAPB) {
file_seek(wth->fh, 297, SEEK_CUR);
wth->data_offset += 297;
}
return 1;
read_error:
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
/* Read the next packet */
static gboolean radcom_read(wtap *wth, int *err, long *data_offset)
{
int ret;
struct radcomrec_hdr hdr;
guint16 length;
guint32 sec;
int bytes_read;
struct tm tm;
char fcs[2];
/* Read record header. */
*data_offset = wth->data_offset;
ret = radcom_read_rec_header(wth->fh, &hdr, err);
if (ret <= 0) {
/* Read error or EOF */
return FALSE;
}
wth->data_offset += sizeof hdr;
length = pletohs(&hdr.length);
if (length == 0) return FALSE;
if (wth->file_encap == WTAP_ENCAP_LAPB)
length -= 2; /* FCS */
wth->phdr.len = length;
wth->phdr.caplen = length;
tm.tm_year = pletohs(&hdr.date.year)-1900;
tm.tm_mon = hdr.date.month-1;
tm.tm_mday = hdr.date.day;
sec = pletohl(&hdr.date.sec);
tm.tm_hour = sec/3600;
tm.tm_min = (sec%3600)/60;
tm.tm_sec = sec%60;
tm.tm_isdst = -1;
wth->phdr.ts.tv_sec = mktime(&tm);
wth->phdr.ts.tv_usec = pletohl(&hdr.date.usec);
wth->pseudo_header.x25.flags = (hdr.dce & 0x1) ? 0x00 : 0x80;
/*
* Read the packet data.
*/
buffer_assure_space(wth->frame_buffer, length);
if (radcom_read_rec_data(wth->fh,
buffer_start_ptr(wth->frame_buffer), length, err) < 0)
return FALSE; /* Read error */
wth->data_offset += length;
wth->phdr.pkt_encap = wth->file_encap;
if (wth->file_encap == WTAP_ENCAP_LAPB) {
/* Read the FCS.
XXX - should we put it in the pseudo-header? */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&fcs, 1, sizeof fcs, wth->fh);
if (bytes_read != sizeof fcs) {
*err = file_error(wth->fh);
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
wth->data_offset += sizeof fcs;
}
return TRUE;
}
static int
radcom_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, u_char *pd, int length)
{
int ret;
int err; /* XXX - return this */
struct radcomrec_hdr hdr;
file_seek(wth->random_fh, seek_off, SEEK_SET);
/* Read record header. */
ret = radcom_read_rec_header(wth->random_fh, &hdr, &err);
if (ret <= 0) {
/* Read error or EOF */
return ret;
}
pseudo_header->x25.flags = (hdr.dce & 0x1) ? 0x00 : 0x80;
/*
* Read the packet data.
*/
return radcom_read_rec_data(wth->random_fh, pd, length, &err);
}
static int
radcom_read_rec_header(FILE_T fh, struct radcomrec_hdr *hdr, int *err)
{
int bytes_read;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(hdr, 1, sizeof *hdr, fh);
if (bytes_read != sizeof *hdr) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
return 1;
}
static int
radcom_read_rec_data(FILE_T fh, u_char *pd, int length, int *err)
{
int bytes_read;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(pd, 1, length, fh);
if (bytes_read != length) {
*err = file_error(fh);
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
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