![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>
388 lines
11 KiB
C
388 lines
11 KiB
C
/* radcom.c
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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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 USA.
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*/
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#include "config.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 "radcom.h"
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struct frame_date {
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guint16 year;
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guint8 month;
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guint8 day;
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guint32 sec; /* seconds since midnight */
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guint32 usec;
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};
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struct unaligned_frame_date {
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char year[2];
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char month;
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char day;
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char sec[4]; /* seconds since midnight */
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char usec[4];
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};
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/* Found at the beginning of the file. Bytes 2 and 3 (D2:00) seem to be
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* different in some captures */
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static const guint8 radcom_magic[8] = {
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0x42, 0xD2, 0x00, 0x34, 0x12, 0x66, 0x22, 0x88
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};
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static const guint8 encap_magic[4] = {
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0x00, 0x42, 0x43, 0x09
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};
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static const guint8 active_time_magic[11] = {
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'A', 'c', 't', 'i', 'v', 'e', ' ', 'T', 'i', 'm', 'e'
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};
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/* RADCOM record header - followed by frame data (perhaps including FCS).
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"data_length" appears to be the length of packet data following
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the record header. It's 0 in the last record.
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"length" appears to be the amount of captured packet data, and
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"real_length" might be the actual length of the frame on the wire -
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in some captures, it's the same as "length", and, in others,
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it's greater than "length". In the last record, however, those
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may have bogus values (or is that some kind of trailer record?).
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"xxx" appears to be all-zero in all but the last record in one
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capture; if so, perhaps this indicates that the last record is,
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in fact, a trailer of some sort, and some field in the header
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is a record type. */
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struct radcomrec_hdr {
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char xxx[4]; /* unknown */
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char data_length[2]; /* packet length? */
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char xxy[5]; /* unknown */
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struct unaligned_frame_date date; /* date/time stamp of packet */
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char real_length[2]; /* actual length of packet */
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char length[2]; /* captured length of packet */
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char xxz[2]; /* unknown */
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char dce; /* DCE/DTE flag (and other flags?) */
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char xxw[9]; /* unknown */
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};
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static gboolean radcom_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean radcom_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
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static gboolean radcom_read_rec(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info);
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wtap_open_return_val radcom_open(wtap *wth, int *err, gchar **err_info)
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{
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guint8 r_magic[8], t_magic[11], search_encap[7];
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struct frame_date start_date;
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#if 0
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guint32 sec;
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struct tm tm;
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#endif
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/* Read in the string that should be at the start of a RADCOM file */
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if (!wtap_read_bytes(wth->fh, r_magic, 8, 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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/* XXX: bytes 2 and 3 of the "magic" header seem to be different in some
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* captures. We force them to our standard value so that the test
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* succeeds (until we find if they have a special meaning, perhaps a
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* version number ?) */
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r_magic[1] = 0xD2;
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r_magic[2] = 0x00;
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if (memcmp(r_magic, radcom_magic, 8) != 0) {
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return WTAP_OPEN_NOT_MINE;
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}
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/* Look for the "Active Time" string. The "frame_date" structure should
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* be located 32 bytes before the beginning of this string */
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if (!wtap_read_bytes(wth->fh, t_magic, 11, 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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while (memcmp(t_magic, active_time_magic, 11) != 0)
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{
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if (file_seek(wth->fh, -10, SEEK_CUR, err) == -1)
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return WTAP_OPEN_ERROR;
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if (!wtap_read_bytes(wth->fh, t_magic, 11, 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 (file_seek(wth->fh, -43, SEEK_CUR, err) == -1)
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return WTAP_OPEN_ERROR;
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/* Get capture start time */
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if (!wtap_read_bytes(wth->fh, &start_date, sizeof(struct frame_date),
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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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/* So what time is this? */
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if (!wtap_read_bytes(wth->fh, NULL, sizeof(struct frame_date),
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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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for (;;) {
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if (!wtap_read_bytes(wth->fh, search_encap, 4,
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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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if (memcmp(encap_magic, search_encap, 4) == 0)
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break;
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/*
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* OK, that's not it, go forward 1 byte - reading
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* the magic moved us forward 4 bytes, so seeking
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* backward 3 bytes moves forward 1 byte - and
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* try the 4 bytes at that offset.
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*/
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if (file_seek(wth->fh, -3, SEEK_CUR, err) == -1)
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return WTAP_OPEN_ERROR;
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}
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if (!wtap_read_bytes(wth->fh, NULL, 12, 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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if (!wtap_read_bytes(wth->fh, search_encap, 4, 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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/* This is a radcom file */
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_RADCOM;
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wth->subtype_read = radcom_read;
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wth->subtype_seek_read = radcom_seek_read;
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wth->snapshot_length = 0; /* not available in header, only in frame */
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wth->file_tsprec = WTAP_TSPREC_USEC;
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#if 0
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tm.tm_year = pletoh16(&start_date.year)-1900;
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tm.tm_mon = start_date.month-1;
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tm.tm_mday = start_date.day;
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sec = pletoh32(&start_date.sec);
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tm.tm_hour = sec/3600;
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tm.tm_min = (sec%3600)/60;
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tm.tm_sec = sec%60;
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tm.tm_isdst = -1;
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#endif
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if (memcmp(search_encap, "LAPB", 4) == 0)
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wth->file_encap = WTAP_ENCAP_LAPB;
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else if (memcmp(search_encap, "Ethe", 4) == 0)
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wth->file_encap = WTAP_ENCAP_ETHERNET;
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else if (memcmp(search_encap, "ATM/", 4) == 0)
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wth->file_encap = WTAP_ENCAP_ATM_RFC1483;
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else {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup_printf("radcom: network type \"%.4s\" unknown", search_encap);
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return WTAP_OPEN_ERROR;
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}
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#if 0
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if (!wtap_read_bytes(wth->fh, &next_date, sizeof(struct frame_date),
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err, err_info))
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return WTAP_OPEN_ERROR;
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while (memcmp(&start_date, &next_date, 4)) {
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if (file_seek(wth->fh, 1-sizeof(struct frame_date), SEEK_CUR, err) == -1)
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return WTAP_OPEN_ERROR;
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if (!wtap_read_bytes(wth->fh, &next_date, sizeof(struct frame_date),
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err, err_info))
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return WTAP_OPEN_ERROR;
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}
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#endif
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if (wth->file_encap == WTAP_ENCAP_ETHERNET) {
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if (!wtap_read_bytes(wth->fh, NULL, 294, err, err_info))
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return WTAP_OPEN_ERROR;
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} else if (wth->file_encap == WTAP_ENCAP_LAPB) {
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if (!wtap_read_bytes(wth->fh, NULL, 297, err, err_info))
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return WTAP_OPEN_ERROR;
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} else if (wth->file_encap == WTAP_ENCAP_ATM_RFC1483) {
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if (!wtap_read_bytes(wth->fh, NULL, 504, err, err_info))
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return WTAP_OPEN_ERROR;
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}
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return WTAP_OPEN_MINE;
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}
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/* Read the next packet */
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static gboolean radcom_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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char fcs[2];
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*data_offset = file_tell(wth->fh);
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/* Read record. */
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if (!radcom_read_rec(wth, wth->fh, &wth->phdr, wth->frame_buffer,
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err, err_info)) {
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/* Read error or EOF */
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return FALSE;
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}
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if (wth->file_encap == WTAP_ENCAP_LAPB) {
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/* Read the FCS.
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XXX - should we have some way of indicating the
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presence and size of an FCS to our caller?
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That'd let us handle other file types as well. */
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if (!wtap_read_bytes(wth->fh, &fcs, sizeof fcs, err, err_info))
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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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radcom_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf,
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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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/* Read record. */
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if (!radcom_read_rec(wth, wth->random_fh, phdr, buf, err,
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err_info)) {
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/* Read error or EOF */
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if (*err == 0) {
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/* EOF means "short read" in random-access mode */
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*err = WTAP_ERR_SHORT_READ;
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}
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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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radcom_read_rec(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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struct radcomrec_hdr hdr;
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guint16 data_length, real_length, length;
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guint32 sec;
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struct tm tm;
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guint8 atmhdr[8];
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if (!wtap_read_bytes_or_eof(fh, &hdr, sizeof hdr, err, err_info))
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return FALSE;
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data_length = pletoh16(&hdr.data_length);
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if (data_length == 0) {
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/*
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* The last record appears to have 0 in its "data_length"
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* field, but non-zero values in other fields, so we
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* check for that and treat it as an EOF indication.
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*/
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*err = 0;
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return FALSE;
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}
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length = pletoh16(&hdr.length);
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real_length = pletoh16(&hdr.real_length);
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/*
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* The maximum value of length is 65535, which is less than
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* WTAP_MAX_PACKET_SIZE_STANDARD will ever be, so we don't need to check
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* it.
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*/
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phdr->rec_type = REC_TYPE_PACKET;
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phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
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tm.tm_year = pletoh16(&hdr.date.year)-1900;
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tm.tm_mon = (hdr.date.month&0x0f)-1;
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tm.tm_mday = hdr.date.day;
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sec = pletoh32(&hdr.date.sec);
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tm.tm_hour = sec/3600;
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tm.tm_min = (sec%3600)/60;
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tm.tm_sec = sec%60;
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tm.tm_isdst = -1;
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phdr->ts.secs = mktime(&tm);
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phdr->ts.nsecs = pletoh32(&hdr.date.usec) * 1000;
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switch (wth->file_encap) {
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case WTAP_ENCAP_ETHERNET:
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/* XXX - is there an FCS? */
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phdr->pseudo_header.eth.fcs_len = -1;
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break;
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case WTAP_ENCAP_LAPB:
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phdr->pseudo_header.x25.flags = (hdr.dce & 0x1) ?
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0x00 : FROM_DCE;
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length -= 2; /* FCS */
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real_length -= 2;
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break;
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case WTAP_ENCAP_ATM_RFC1483:
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/*
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* XXX - is this stuff a pseudo-header?
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* The direction appears to be in the "hdr.dce" field.
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*/
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if (!wtap_read_bytes(fh, atmhdr, sizeof atmhdr, err,
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err_info))
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return FALSE; /* Read error */
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length -= 8;
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real_length -= 8;
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break;
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}
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phdr->len = real_length;
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phdr->caplen = length;
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/*
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* Read the packet data.
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*/
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if (!wtap_read_packet_bytes(fh, buf, length, err, err_info))
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return FALSE; /* Read error */
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return TRUE;
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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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