forked from osmocom/wireshark
9d41c658fe
wtap_seek_read(). svn path=/trunk/; revision=54570
172 lines
5 KiB
C
172 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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* $Id$
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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 "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->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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