![Guy Harris](/assets/img/avatar_default.png)
Otherwise, if you link with both libwiretap and libfiletap, it's anybody's guess which one you get. That means you're wasting memory with two copies of its routines if they're identical, and means surprising behavior if they're not (which showed up when I was debugging a double-free crash - fixing libwiretap's buffer_free() didn't fix the problem, because Wireshark happened to be calling libfiletap' unfixed buffer_free()). There's nothing *tap-specific about Buffers, anyway, so it really belongs in wsutil. Change-Id: I91537e46917e91277981f8f3365a2c0873152870 Reviewed-on: https://code.wireshark.org/review/3066 Reviewed-by: Guy Harris <guy@alum.mit.edu>
171 lines
5 KiB
C
171 lines
5 KiB
C
/* packetlogger.c
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* Routines for opening Apple's (Bluetooth) PacketLogger file format captures
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* Copyright 2008-2009, Stephen Fisher (see AUTHORS file)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Based on commview.c, Linux's BlueZ-Gnome Analyzer program and hexdumps of
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* the output files from Apple's PacketLogger tool.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include "wtap.h"
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#include "wtap-int.h"
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#include <wsutil/buffer.h>
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#include "file_wrappers.h"
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#include "packetlogger.h"
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typedef struct packetlogger_header {
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guint32 len;
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guint64 ts;
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} packetlogger_header_t;
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static gboolean packetlogger_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean packetlogger_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info);
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static gboolean packetlogger_read_header(packetlogger_header_t *pl_hdr,
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FILE_T fh, int *err, gchar **err_info);
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static gboolean packetlogger_read_packet(FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err,
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gchar **err_info);
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int packetlogger_open(wtap *wth, int *err, gchar **err_info)
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{
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packetlogger_header_t pl_hdr;
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guint8 type;
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if(!packetlogger_read_header(&pl_hdr, wth->fh, err, err_info)) {
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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if (file_read(&type, 1, wth->fh) <= 0) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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/* Verify this file belongs to us */
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if (!((8 <= pl_hdr.len) && (pl_hdr.len < 65536) &&
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(type < 0x04 || type == 0xFB || type == 0xFC || type == 0xFE || type == 0xFF)))
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return 0;
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/* No file header. Reset the fh to 0 so we can read the first packet */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return -1;
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/* Set up the pointers to the handlers for this file type */
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wth->subtype_read = packetlogger_read;
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wth->subtype_seek_read = packetlogger_seek_read;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PACKETLOGGER;
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wth->file_encap = WTAP_ENCAP_PACKETLOGGER;
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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return 1; /* Our kind of file */
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}
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static gboolean
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packetlogger_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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{
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*data_offset = file_tell(wth->fh);
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return packetlogger_read_packet(wth->fh, &wth->phdr,
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wth->frame_buffer, err, err_info);
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}
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static gboolean
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packetlogger_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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{
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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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if(!packetlogger_read_packet(wth->random_fh, phdr, buf, err, 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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static gboolean
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packetlogger_read_header(packetlogger_header_t *pl_hdr, FILE_T fh, int *err,
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gchar **err_info)
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{
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wtap_file_read_expected_bytes(&pl_hdr->len, 4, fh, err, err_info);
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wtap_file_read_expected_bytes(&pl_hdr->ts, 8, fh, err, err_info);
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/* Convert multi-byte values from big endian to host endian */
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pl_hdr->len = GUINT32_FROM_BE(pl_hdr->len);
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pl_hdr->ts = GUINT64_FROM_BE(pl_hdr->ts);
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return TRUE;
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}
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static gboolean
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packetlogger_read_packet(FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf,
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int *err, gchar **err_info)
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{
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packetlogger_header_t pl_hdr;
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if(!packetlogger_read_header(&pl_hdr, fh, err, err_info))
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return FALSE;
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if (pl_hdr.len < 8) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("packetlogger: record length %u is too small", pl_hdr.len);
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return FALSE;
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}
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if (pl_hdr.len - 8 > WTAP_MAX_PACKET_SIZE) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("packetlogger: File has %u-byte packet, bigger than maximum of %u",
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pl_hdr.len - 8, WTAP_MAX_PACKET_SIZE);
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return FALSE;
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}
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phdr->rec_type = REC_TYPE_PACKET;
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phdr->presence_flags = WTAP_HAS_TS;
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phdr->len = pl_hdr.len - 8;
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phdr->caplen = pl_hdr.len - 8;
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phdr->ts.secs = (time_t) (pl_hdr.ts >> 32);
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phdr->ts.nsecs = (int)((pl_hdr.ts & 0xFFFFFFFF) * 1000);
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return wtap_read_packet_bytes(fh, buf, phdr->caplen, err, err_info);
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}
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