forked from osmocom/wireshark
![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>
226 lines
6.7 KiB
C
226 lines
6.7 KiB
C
/* stanag4607.c
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*
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* STANAG 4607 file reading
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*
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* http://www.nato.int/structur/AC/224/standard/4607/4607e_JAS_ED3.pdf
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* (that is now missing from that site, but is available on the Wayback
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* Machine)
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*
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* https://nso.nato.int/nso/zPublic/ap/aedp-7(2).pdf
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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 "wtap-int.h"
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#include "file_wrappers.h"
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#include <wsutil/buffer.h>
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#include "stanag4607.h"
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typedef struct {
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time_t base_secs;
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} stanag4607_t;
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#define PKT_HDR_SIZE 32 /* size of a packet header */
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#define SEG_HDR_SIZE 5 /* size of a segment header */
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static gboolean is_valid_id(guint16 version_id)
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{
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#define VERSION_21 0x3231
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#define VERSION_30 0x3330
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if ((version_id != VERSION_21) &&
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(version_id != VERSION_30))
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/* Not a stanag4607 file */
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return FALSE;
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return TRUE;
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}
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static gboolean stanag4607_read_file(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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{
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stanag4607_t *stanag4607 = (stanag4607_t *)wth->priv;
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guint32 millisecs, secs, nsecs;
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gint64 offset = 0;
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guint8 stanag_pkt_hdr[PKT_HDR_SIZE+SEG_HDR_SIZE];
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guint32 packet_size;
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*err = 0;
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/* Combined packet header and segment header */
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if (!wtap_read_bytes_or_eof(fh, stanag_pkt_hdr, sizeof stanag_pkt_hdr, err, err_info))
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return FALSE;
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offset += sizeof stanag_pkt_hdr;
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if (!is_valid_id(pntoh16(&stanag_pkt_hdr[0]))) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Bad version number");
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return FALSE;
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}
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phdr->rec_type = REC_TYPE_PACKET;
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/* The next 4 bytes are the packet length */
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packet_size = pntoh32(&stanag_pkt_hdr[2]);
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if (packet_size > 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("stanag4607: File has %" G_GUINT32_FORMAT "d-byte packet, "
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"bigger than maximum of %u", packet_size, WTAP_MAX_PACKET_SIZE_STANDARD);
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return FALSE;
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}
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if (packet_size < PKT_HDR_SIZE+SEG_HDR_SIZE) {
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/*
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* Probably a corrupt capture file; don't, for example, loop
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* infinitely if the size is zero.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("stanag4607: File has %" G_GUINT32_FORMAT "d-byte packet, "
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"smaller than minimum of %u", packet_size, PKT_HDR_SIZE+SEG_HDR_SIZE);
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return FALSE;
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}
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phdr->caplen = packet_size;
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phdr->len = packet_size;
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/* Sadly, the header doesn't contain times; but some segments do */
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/* So, get the segment header, which is just past the 32-byte header. */
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phdr->presence_flags = WTAP_HAS_TS;
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/* If no time specified, it's the last baseline time */
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phdr->ts.secs = stanag4607->base_secs;
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phdr->ts.nsecs = 0;
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millisecs = 0;
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#define MISSION_SEGMENT 1
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#define DWELL_SEGMENT 2
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#define JOB_DEFINITION_SEGMENT 5
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#define PLATFORM_LOCATION_SEGMENT 13
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if (MISSION_SEGMENT == stanag_pkt_hdr[32]) {
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guint8 mseg[39];
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struct tm tm;
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if (!wtap_read_bytes(fh, &mseg, sizeof mseg, err, err_info))
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return FALSE;
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offset += sizeof mseg;
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tm.tm_year = pntoh16(&mseg[35]) - 1900;
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tm.tm_mon = mseg[37] - 1;
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tm.tm_mday = mseg[38];
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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stanag4607->base_secs = mktime(&tm);
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phdr->ts.secs = stanag4607->base_secs;
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}
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else if (PLATFORM_LOCATION_SEGMENT == stanag_pkt_hdr[32]) {
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if (!wtap_read_bytes(fh, &millisecs, sizeof millisecs, err, err_info))
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return FALSE;
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offset += sizeof millisecs;
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millisecs = g_ntohl(millisecs);
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}
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else if (DWELL_SEGMENT == stanag_pkt_hdr[32]) {
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guint8 dseg[19];
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if (!wtap_read_bytes(fh, &dseg, sizeof dseg, err, err_info))
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return FALSE;
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offset += sizeof dseg;
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millisecs = pntoh32(&dseg[15]);
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}
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if (0 != millisecs) {
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secs = millisecs/1000;
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nsecs = (millisecs - 1000 * secs) * 1000000;
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phdr->ts.secs = stanag4607->base_secs + secs;
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phdr->ts.nsecs = nsecs;
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}
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/* wind back to the start of the packet ... */
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if (file_seek(fh, - offset, SEEK_CUR, err) == -1)
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return FALSE;
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return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info);
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}
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static gboolean stanag4607_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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{
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gint64 offset;
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*err = 0;
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offset = file_tell(wth->fh);
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*data_offset = offset;
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return stanag4607_read_file(wth, wth->fh, &wth->phdr, wth->frame_buffer, err, err_info);
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}
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static gboolean stanag4607_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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{
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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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return stanag4607_read_file(wth, wth->random_fh, phdr, buf, err, err_info);
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}
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wtap_open_return_val stanag4607_open(wtap *wth, int *err, gchar **err_info)
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{
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guint16 version_id;
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stanag4607_t *stanag4607;
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if (!wtap_read_bytes(wth->fh, &version_id, sizeof version_id, err, err_info))
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return (*err != WTAP_ERR_SHORT_READ) ? WTAP_OPEN_ERROR : WTAP_OPEN_NOT_MINE;
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if (!is_valid_id(GUINT16_TO_BE(version_id)))
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/* Not a stanag4607 file */
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return WTAP_OPEN_NOT_MINE;
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/* seek back to the start of the file */
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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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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_STANAG_4607;
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wth->file_encap = WTAP_ENCAP_STANAG_4607;
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wth->snapshot_length = 0; /* not known */
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stanag4607 = (stanag4607_t *)g_malloc(sizeof(stanag4607_t));
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wth->priv = (void *)stanag4607;
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stanag4607->base_secs = 0; /* unknown as of yet */
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wth->subtype_read = stanag4607_read;
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wth->subtype_seek_read = stanag4607_seek_read;
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wth->file_tsprec = WTAP_TSPREC_MSEC;
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return WTAP_OPEN_MINE;
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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: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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