![Guy Harris](/assets/img/avatar_default.png)
Use WTAP_MAX_PACKET_SIZE_STANDARD, set to 256KB, for everything except for D-Bus captures. Use WTAP_MAX_PACKET_SIZE_DBUS, set to 128MB, for them, because that's the largest possible D-Bus message size. See https://bugs.freedesktop.org/show_bug.cgi?id=100220 for an example of the problems caused by limiting the snapshot length to 256KB for D-Bus. Have a snapshot length of 0 in a capture_file structure mean "there is no snapshot length for the file"; we don't need the has_snap field in that case, a value of 0 mean "no, we don't have a snapshot length". In dumpcap, start out with a pipe buffer size of 2KB, and grow it as necessary. When checking for a too-big packet from a pipe, check against the appropriate maximum - 128MB for DLT_DBUS, 256KB for everything else. Change-Id: Ib2ce7a0cf37b971fbc0318024fd011e18add8b20 Reviewed-on: https://code.wireshark.org/review/21952 Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Guy Harris <guy@alum.mit.edu>
221 lines
6.6 KiB
C
221 lines
6.6 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 <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "packetlogger.h"
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typedef struct {
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gboolean little_endian;
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} packetlogger_t;
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typedef struct packetlogger_header {
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guint32 len;
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guint32 ts_secs;
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guint32 ts_usecs;
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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, gboolean little_endian,
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int *err, gchar **err_info);
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static gboolean packetlogger_read_packet(wtap *wth, 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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wtap_open_return_val packetlogger_open(wtap *wth, int *err, gchar **err_info)
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{
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gboolean little_endian = FALSE;
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packetlogger_header_t pl_hdr;
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guint8 type;
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packetlogger_t *packetlogger;
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if(!packetlogger_read_header(&pl_hdr, wth->fh, little_endian,
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err, err_info)) {
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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}
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if (!wtap_read_bytes(wth->fh, &type, 1, err, err_info)) {
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if (*err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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}
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/*
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* If the upper 16 bits of the length are non-zero and the lower
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* 16 bits are zero, assume the file is little-endian.
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*/
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if ((pl_hdr.len & 0x0000FFFF) == 0 &&
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(pl_hdr.len & 0xFFFF0000) != 0) {
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/*
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* Byte-swap the upper 16 bits (the lower 16 bits are
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* zero, so we don't have to look at them).
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*/
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pl_hdr.len = ((pl_hdr.len >> 24) & 0xFF) |
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(((pl_hdr.len >> 16) & 0xFF) << 8);
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little_endian = TRUE;
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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 WTAP_OPEN_NOT_MINE;
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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 WTAP_OPEN_ERROR;
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/* This is a PacketLogger file */
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packetlogger = (packetlogger_t *)g_malloc(sizeof(packetlogger_t));
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packetlogger->little_endian = little_endian;
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wth->priv = (void *)packetlogger;
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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->file_tsprec = WTAP_TSPREC_USEC;
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return WTAP_OPEN_MINE; /* 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, 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, 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,
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gboolean little_endian, int *err, gchar **err_info)
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{
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if (!wtap_read_bytes_or_eof(fh, &pl_hdr->len, 4, err, err_info))
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return FALSE;
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if (!wtap_read_bytes(fh, &pl_hdr->ts_secs, 4, err, err_info))
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return FALSE;
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if (!wtap_read_bytes(fh, &pl_hdr->ts_usecs, 4, err, err_info))
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return FALSE;
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/* Convert multi-byte values to host endian */
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if (little_endian) {
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pl_hdr->len = GUINT32_FROM_LE(pl_hdr->len);
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pl_hdr->ts_secs = GUINT32_FROM_LE(pl_hdr->ts_secs);
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pl_hdr->ts_usecs = GUINT32_FROM_LE(pl_hdr->ts_usecs);
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} else {
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pl_hdr->len = GUINT32_FROM_BE(pl_hdr->len);
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pl_hdr->ts_secs = GUINT32_FROM_BE(pl_hdr->ts_secs);
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pl_hdr->ts_usecs = GUINT32_FROM_BE(pl_hdr->ts_usecs);
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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_packet(wtap *wth, 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_t *packetlogger = (packetlogger_t *)wth->priv;
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packetlogger_header_t pl_hdr;
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if(!packetlogger_read_header(&pl_hdr, fh, packetlogger->little_endian,
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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_STANDARD) {
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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_STANDARD);
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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_secs;
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phdr->ts.nsecs = (int)(pl_hdr.ts_usecs * 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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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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