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/* packetlogger.c
* Routines for opening Apple's (Bluetooth) PacketLogger file format captures
* Copyright 2008-2009, Stephen Fisher (see AUTHORS file)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Based on commview.c, Linux's BlueZ-Gnome Analyzer program and hexdumps of
* the output files from Apple's PacketLogger tool.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include "config.h"
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "packetlogger.h"
typedef struct {
gboolean little_endian;
} packetlogger_t;
typedef struct packetlogger_header {
guint32 len;
guint32 ts_secs;
guint32 ts_usecs;
} packetlogger_header_t;
static gboolean packetlogger_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset);
static gboolean packetlogger_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr,
Buffer *buf, int *err, gchar **err_info);
static gboolean packetlogger_read_header(packetlogger_header_t *pl_hdr,
FILE_T fh, gboolean little_endian,
int *err, gchar **err_info);
static gboolean packetlogger_read_packet(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
Buffer *buf, int *err,
gchar **err_info);
wtap_open_return_val packetlogger_open(wtap *wth, int *err, gchar **err_info)
{
gboolean little_endian = FALSE;
packetlogger_header_t pl_hdr;
guint8 type;
packetlogger_t *packetlogger;
if(!packetlogger_read_header(&pl_hdr, wth->fh, little_endian,
err, err_info)) {
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
if (!wtap_read_bytes(wth->fh, &type, 1, err, err_info)) {
if (*err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
/*
* If the upper 16 bits of the length are non-zero and the lower
* 16 bits are zero, assume the file is little-endian.
*/
if ((pl_hdr.len & 0x0000FFFF) == 0 &&
(pl_hdr.len & 0xFFFF0000) != 0) {
/*
* Byte-swap the upper 16 bits (the lower 16 bits are
* zero, so we don't have to look at them).
*/
pl_hdr.len = ((pl_hdr.len >> 24) & 0xFF) |
(((pl_hdr.len >> 16) & 0xFF) << 8);
little_endian = TRUE;
}
/* Verify this file belongs to us */
if (!((8 <= pl_hdr.len) && (pl_hdr.len < 65536) &&
(type < 0x04 || type == 0xFB || type == 0xFC || type == 0xFE || type == 0xFF)))
return WTAP_OPEN_NOT_MINE;
/* No file header. Reset the fh to 0 so we can read the first packet */
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
return WTAP_OPEN_ERROR;
/* This is a PacketLogger file */
packetlogger = (packetlogger_t *)g_malloc(sizeof(packetlogger_t));
packetlogger->little_endian = little_endian;
wth->priv = (void *)packetlogger;
/* Set up the pointers to the handlers for this file type */
wth->subtype_read = packetlogger_read;
wth->subtype_seek_read = packetlogger_seek_read;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PACKETLOGGER;
wth->file_encap = WTAP_ENCAP_PACKETLOGGER;
wth->file_tsprec = WTAP_TSPREC_USEC;
return WTAP_OPEN_MINE; /* Our kind of file */
}
static gboolean
packetlogger_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
{
*data_offset = file_tell(wth->fh);
return packetlogger_read_packet(wth, wth->fh, &wth->phdr,
wth->frame_buffer, err, err_info);
}
static gboolean
packetlogger_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
Buffer *buf, int *err, gchar **err_info)
{
if(file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
if(!packetlogger_read_packet(wth, wth->random_fh, phdr, buf, err, err_info)) {
if(*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
return TRUE;
}
static gboolean
packetlogger_read_header(packetlogger_header_t *pl_hdr, FILE_T fh,
gboolean little_endian, int *err, gchar **err_info)
{
if (!wtap_read_bytes_or_eof(fh, &pl_hdr->len, 4, err, err_info))
return FALSE;
if (!wtap_read_bytes(fh, &pl_hdr->ts_secs, 4, err, err_info))
return FALSE;
if (!wtap_read_bytes(fh, &pl_hdr->ts_usecs, 4, err, err_info))
return FALSE;
/* Convert multi-byte values to host endian */
if (little_endian) {
pl_hdr->len = GUINT32_FROM_LE(pl_hdr->len);
pl_hdr->ts_secs = GUINT32_FROM_LE(pl_hdr->ts_secs);
pl_hdr->ts_usecs = GUINT32_FROM_LE(pl_hdr->ts_usecs);
} else {
pl_hdr->len = GUINT32_FROM_BE(pl_hdr->len);
pl_hdr->ts_secs = GUINT32_FROM_BE(pl_hdr->ts_secs);
pl_hdr->ts_usecs = GUINT32_FROM_BE(pl_hdr->ts_usecs);
}
return TRUE;
}
static gboolean
packetlogger_read_packet(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf,
int *err, gchar **err_info)
{
packetlogger_t *packetlogger = (packetlogger_t *)wth->priv;
packetlogger_header_t pl_hdr;
if(!packetlogger_read_header(&pl_hdr, fh, packetlogger->little_endian,
err, err_info))
return FALSE;
if (pl_hdr.len < 8) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("packetlogger: record length %u is too small", pl_hdr.len);
return FALSE;
}
if (pl_hdr.len - 8 > WTAP_MAX_PACKET_SIZE) {
/*
* Probably a corrupt capture file; don't blow up trying
* to allocate space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("packetlogger: File has %u-byte packet, bigger than maximum of %u",
pl_hdr.len - 8, WTAP_MAX_PACKET_SIZE);
return FALSE;
}
phdr->rec_type = REC_TYPE_PACKET;
phdr->presence_flags = WTAP_HAS_TS;
phdr->len = pl_hdr.len - 8;
phdr->caplen = pl_hdr.len - 8;
phdr->ts.secs = (time_t)pl_hdr.ts_secs;
phdr->ts.nsecs = (int)(pl_hdr.ts_usecs * 1000);
return wtap_read_packet_bytes(fh, buf, phdr->caplen, err, err_info);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/