![Guy Harris](/assets/img/avatar_default.png)
wtap_file_read_expected_bytes() from an open routine - open routines are supposed to return -1 on error, 0 if the file doesn't appear to be a file of the specified type, or 1 if the file does appear to be a file of the specified type, but those macros will cause the caller to return FALSE on errors (so that, even if there's an I/O error, it reports "the file isn't a file of the specified type" rather than "we got an error trying to read the file"). When doing reads in an open routine before we've concluded that the file is probably of the right type, return 0, rather than -1, if we get WTAP_ERR_SHORT_READ - if we don't have enough data to check whether a file is of a given type, we should keep trying other types, not give up. For reads done *after* we've concluded the file is probably of the right type, if a read doesn't return the number of bytes we asked for, but returns an error of 0, return WTAP_ERR_SHORT_READ - the file is apparently cut short. For NetMon and NetXRay/Windows Sniffer files, use a #define for the magic number size, and use that for both magic numbers. svn path=/trunk/; revision=46803
196 lines
5.4 KiB
C
196 lines
5.4 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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guint8 *pd, int length, int *err,
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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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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 = WTAP_FILE_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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packetlogger_header_t pl_hdr;
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guint bytes_read;
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*data_offset = file_tell(wth->fh);
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if(!packetlogger_read_header(&pl_hdr, wth->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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buffer_assure_space(wth->frame_buffer, pl_hdr.len - 8);
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bytes_read = file_read(buffer_start_ptr(wth->frame_buffer),
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pl_hdr.len - 8,
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wth->fh);
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if(bytes_read != pl_hdr.len - 8) {
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*err = file_error(wth->fh, 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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wth->phdr.presence_flags = WTAP_HAS_TS;
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wth->phdr.len = pl_hdr.len - 8;
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wth->phdr.caplen = pl_hdr.len - 8;
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wth->phdr.ts.secs = (time_t) (pl_hdr.ts >> 32);
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wth->phdr.ts.nsecs = (int)((pl_hdr.ts & 0xFFFFFFFF) * 1000);
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return TRUE;
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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 _U_,
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guint8 *pd, int length, int *err,
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gchar **err_info)
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{
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packetlogger_header_t pl_hdr;
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guint bytes_read;
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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_header(&pl_hdr, wth->random_fh, 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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if(length != (int)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 doesn't match requested length %d", pl_hdr.len, length);
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return FALSE;
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}
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bytes_read = file_read(pd, pl_hdr.len - 8, wth->random_fh);
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if(bytes_read != (pl_hdr.len - 8)) {
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*err = file_error(wth->random_fh, 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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