351 lines
8.7 KiB
C
351 lines
8.7 KiB
C
/* radcom.c
|
|
*
|
|
* $Id: radcom.c,v 1.28 2000/11/17 21:00:40 gram Exp $
|
|
*
|
|
* Wiretap Library
|
|
* Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.org>
|
|
*
|
|
* 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, int *data_offset);
|
|
static int radcom_seek_read(wtap *wth, int 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 */
|
|
file_seek(wth->fh, 0, SEEK_SET);
|
|
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, int *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, int 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;
|
|
}
|