![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>
817 lines
30 KiB
C
817 lines
30 KiB
C
/***************************************************************************
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network_instruments.c - description
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-------------------
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begin : Wed Oct 29 2003
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copyright : (C) 2003 by root
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email : scotte[AT}netinst.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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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 "network_instruments.h"
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static const char network_instruments_magic[] = {"ObserverPktBufferVersion=15.00"};
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static const int true_magic_length = 17;
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static const guint32 observer_packet_magic = 0x88888888;
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/*
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* This structure is used to keep state when writing files. An instance is
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* allocated for each file, and its address is stored in the wtap_dumper.priv
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* pointer field.
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*/
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typedef struct {
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guint64 packet_count;
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guint8 network_type;
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guint32 time_format;
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} observer_dump_private_state;
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/*
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* Some time offsets are calculated in advance here, when the first Observer
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* file is opened for reading or writing, and are then used to adjust frame
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* timestamps as they are read or written.
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*
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* The Wiretap API expects timestamps in nanoseconds relative to
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* January 1, 1970, 00:00:00 GMT (the Wiretap epoch).
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*
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* Observer versions before 13.10 encode frame timestamps in nanoseconds
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* relative to January 1, 2000, 00:00:00 local time (the Observer epoch).
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* Versions 13.10 and later switch over to GMT encoding. Which encoding was used
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* when saving the file is identified via the time format TLV following
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* the file header.
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*
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* Unfortunately, even though Observer versions before 13.10 saved in local
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* time, they didn't include the timezone from which the frames were captured,
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* so converting to GMT correctly from all timezones is impossible. So an
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* assumption is made that the file is being read from within the same timezone
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* that it was written.
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*
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* All code herein is normalized to versions 13.10 and later, special casing for
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* versions earlier. In other words, timestamps are worked with as if
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* they are GMT-encoded, and adjustments from local time are made only if
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* the source file warrants it.
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*
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* All destination files are saved in GMT format.
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*/
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static const time_t ansi_to_observer_epoch_offset = 946684800;
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static time_t gmt_to_localtime_offset = (time_t) -1;
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static const char *init_gmt_to_localtime_offset(void)
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{
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if (gmt_to_localtime_offset == (time_t) -1) {
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time_t ansi_epoch_plus_one_day = 86400;
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struct tm *tm;
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struct tm gmt_tm;
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struct tm local_tm;
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/*
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* Compute the local time zone offset as the number of seconds west
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* of GMT. There's no obvious cross-platform API for querying this
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* directly. As a workaround, GMT and local tm structures are populated
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* relative to the ANSI time_t epoch (plus one day to ensure that
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* local time stays after 1970/1/1 00:00:00). They are then converted
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* back to time_t as if they were both local times, resulting in the
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* time zone offset being the difference between them.
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*/
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tm = gmtime(&ansi_epoch_plus_one_day);
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if (tm == NULL)
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return "gmtime(one day past the Epoch) fails (this \"shouldn't happen\")";
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gmt_tm = *tm;
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tm = localtime(&ansi_epoch_plus_one_day);
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if (tm == NULL)
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return "localtime(one day past the Epoch) fails (this \"shouldn't happen\")";
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local_tm = *tm;
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local_tm.tm_isdst = 0;
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gmt_to_localtime_offset = mktime(&gmt_tm) - mktime(&local_tm);
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}
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return NULL;
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}
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static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean observer_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 int read_packet_header(wtap *wth, FILE_T fh, union wtap_pseudo_header *pseudo_header,
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packet_entry_header *packet_header, int *err, gchar **err_info);
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static gboolean process_packet_header(wtap *wth,
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packet_entry_header *packet_header, struct wtap_pkthdr *phdr, int *err,
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gchar **err_info);
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static int read_packet_data(FILE_T fh, int offset_to_frame, int current_offset_from_packet_header,
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Buffer *buf, int length, int *err, char **err_info);
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static gboolean skip_to_next_packet(wtap *wth, int offset_to_next_packet,
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int current_offset_from_packet_header, int *err, char **err_info);
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static gboolean observer_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
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const guint8 *pd, int *err, gchar **err_info);
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static gint observer_to_wtap_encap(int observer_encap);
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static gint wtap_to_observer_encap(int wtap_encap);
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wtap_open_return_val network_instruments_open(wtap *wth, int *err, gchar **err_info)
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{
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int offset;
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capture_file_header file_header;
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guint i;
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tlv_header tlvh;
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int seek_increment;
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int header_offset;
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packet_entry_header packet_header;
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observer_dump_private_state * private_state = NULL;
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offset = 0;
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/* read in the buffer file header */
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if (!wtap_read_bytes(wth->fh, &file_header, sizeof file_header,
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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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offset += (int)sizeof file_header;
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CAPTURE_FILE_HEADER_FROM_LE_IN_PLACE(file_header);
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/* check if version info is present */
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if (memcmp(file_header.observer_version, network_instruments_magic, true_magic_length)!=0) {
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return WTAP_OPEN_NOT_MINE;
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}
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/* initialize the private state */
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private_state = (observer_dump_private_state *) g_malloc(sizeof(observer_dump_private_state));
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private_state->time_format = TIME_INFO_LOCAL;
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wth->priv = (void *) private_state;
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/* get the location of the first packet */
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/* v15 and newer uses high byte offset, in previous versions it will be 0 */
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header_offset = file_header.offset_to_first_packet + ((int)(file_header.offset_to_first_packet_high_byte)<<16);
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/* process extra information */
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for (i = 0; i < file_header.number_of_information_elements; i++) {
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/* for safety break if we've reached the first packet */
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if (offset >= header_offset)
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break;
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/* read the TLV header */
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if (!wtap_read_bytes(wth->fh, &tlvh, sizeof tlvh, err, err_info))
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return WTAP_OPEN_ERROR;
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offset += (int)sizeof tlvh;
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TLV_HEADER_FROM_LE_IN_PLACE(tlvh);
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if (tlvh.length < sizeof tlvh) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("Observer: bad record (TLV length %u < %lu)",
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tlvh.length, (unsigned long)sizeof tlvh);
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return WTAP_OPEN_ERROR;
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}
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/* process (or skip over) the current TLV */
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switch (tlvh.type) {
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case INFORMATION_TYPE_TIME_INFO:
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/* XXX - what if tlvh.length != sizeof sizeof private_state->time_format? */
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if (!wtap_read_bytes(wth->fh, &private_state->time_format,
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sizeof private_state->time_format,
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err, err_info))
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return WTAP_OPEN_ERROR;
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private_state->time_format = GUINT32_FROM_LE(private_state->time_format);
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offset += (int)sizeof private_state->time_format;
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break;
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default:
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seek_increment = tlvh.length - (int)sizeof tlvh;
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if (seek_increment > 0) {
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if (!wtap_read_bytes(wth->fh, NULL, seek_increment, err, err_info))
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return WTAP_OPEN_ERROR;
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}
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offset += seek_increment;
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}
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}
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/* get to the first packet */
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if (header_offset < offset) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("Observer: bad record (offset to first packet %d < %d)",
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header_offset, offset);
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return WTAP_OPEN_ERROR;
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}
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seek_increment = header_offset - offset;
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if (seek_increment > 0) {
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if (!wtap_read_bytes(wth->fh, NULL, seek_increment, err, err_info))
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return WTAP_OPEN_ERROR;
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}
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/* pull off the packet header */
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if (!wtap_read_bytes(wth->fh, &packet_header, sizeof packet_header,
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err, err_info))
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return WTAP_OPEN_ERROR;
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PACKET_ENTRY_HEADER_FROM_LE_IN_PLACE(packet_header);
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/* check the packet's magic number */
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if (packet_header.packet_magic != observer_packet_magic) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup_printf("Observer: unsupported packet version %ul", packet_header.packet_magic);
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return WTAP_OPEN_ERROR;
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}
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/* check the data link type */
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if (observer_to_wtap_encap(packet_header.network_type) == WTAP_ENCAP_UNKNOWN) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup_printf("Observer: network type %u unknown or unsupported", packet_header.network_type);
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return WTAP_OPEN_ERROR;
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}
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wth->file_encap = observer_to_wtap_encap(packet_header.network_type);
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/* set up the rest of the capture parameters */
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private_state->packet_count = 0;
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private_state->network_type = wtap_to_observer_encap(wth->file_encap);
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wth->subtype_read = observer_read;
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wth->subtype_seek_read = observer_seek_read;
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wth->subtype_close = NULL;
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wth->subtype_sequential_close = NULL;
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wth->snapshot_length = 0; /* not available in header */
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wth->file_tsprec = WTAP_TSPREC_NSEC;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_NETWORK_INSTRUMENTS;
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/* reset the pointer to the first packet */
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if (file_seek(wth->fh, header_offset, SEEK_SET, err) == -1)
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return WTAP_OPEN_ERROR;
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if (init_gmt_to_localtime_offset() != NULL) {
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*err = WTAP_ERR_INTERNAL;
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/*
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* XXX - we should return the error string, so the caller
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* can report the details of the internal error, but that
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* would require plugin file readers to do so for internal
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* errors as well, which could break binary compatibility;
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* we'll do that in the next release.
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*/
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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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/* Reads the next packet. */
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static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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int header_bytes_consumed;
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int data_bytes_consumed;
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packet_entry_header packet_header;
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/* skip records other than data records */
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for (;;) {
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*data_offset = file_tell(wth->fh);
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/* process the packet header, including TLVs */
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header_bytes_consumed = read_packet_header(wth, wth->fh, &wth->phdr.pseudo_header, &packet_header, err,
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err_info);
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if (header_bytes_consumed <= 0)
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return FALSE; /* EOF or error */
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if (packet_header.packet_type == PACKET_TYPE_DATA_PACKET)
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break;
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/* skip to next packet */
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if (!skip_to_next_packet(wth, packet_header.offset_to_next_packet,
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header_bytes_consumed, err, err_info)) {
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return FALSE; /* EOF or error */
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}
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}
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if (!process_packet_header(wth, &packet_header, &wth->phdr, err, err_info))
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return FALSE;
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/* read the frame data */
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data_bytes_consumed = read_packet_data(wth->fh, packet_header.offset_to_frame,
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header_bytes_consumed, wth->frame_buffer,
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wth->phdr.caplen, err, err_info);
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if (data_bytes_consumed < 0) {
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return FALSE;
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}
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/* skip over any extra bytes following the frame data */
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if (!skip_to_next_packet(wth, packet_header.offset_to_next_packet,
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header_bytes_consumed + data_bytes_consumed, 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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/* Reads a packet at an offset. */
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static gboolean observer_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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{
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union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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packet_entry_header packet_header;
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int offset;
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int data_bytes_consumed;
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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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/* process the packet header, including TLVs */
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offset = read_packet_header(wth, wth->random_fh, pseudo_header, &packet_header, err,
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err_info);
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if (offset <= 0)
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return FALSE; /* EOF or error */
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if (!process_packet_header(wth, &packet_header, phdr, err, err_info))
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return FALSE;
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/* read the frame data */
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data_bytes_consumed = read_packet_data(wth->random_fh, packet_header.offset_to_frame,
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offset, buf, phdr->caplen, err, err_info);
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if (data_bytes_consumed < 0) {
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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 int
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read_packet_header(wtap *wth, FILE_T fh, union wtap_pseudo_header *pseudo_header,
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packet_entry_header *packet_header, int *err, gchar **err_info)
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{
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int offset;
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guint i;
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tlv_header tlvh;
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int seek_increment;
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tlv_wireless_info wireless_header;
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offset = 0;
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/* pull off the packet header */
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if (!wtap_read_bytes_or_eof(fh, packet_header, sizeof *packet_header,
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err, err_info)) {
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if (*err != 0)
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return -1;
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return 0; /* EOF */
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}
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offset += (int)sizeof *packet_header;
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PACKET_ENTRY_HEADER_FROM_LE_IN_PLACE(*packet_header);
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/* check the packet's magic number */
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if (packet_header->packet_magic != observer_packet_magic) {
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/*
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* Some files are zero-padded at the end. There is no warning of this
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* in the previous packet header information, such as setting
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* offset_to_next_packet to zero. So detect this situation by treating
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* an all-zero header as a sentinel. Return EOF when it is encountered,
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* rather than treat it as a bad record.
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*/
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for (i = 0; i < sizeof *packet_header; i++) {
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if (((guint8*) packet_header)[i] != 0)
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break;
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}
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if (i == sizeof *packet_header) {
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*err = 0;
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return 0; /* EOF */
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}
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("Observer: bad record: Invalid magic number 0x%08x",
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packet_header->packet_magic);
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return -1;
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}
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/* initialize the pseudo header */
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switch (wth->file_encap) {
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case WTAP_ENCAP_ETHERNET:
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/* There is no FCS in the frame */
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pseudo_header->eth.fcs_len = 0;
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break;
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case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
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memset(&pseudo_header->ieee_802_11, 0, sizeof(pseudo_header->ieee_802_11));
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pseudo_header->ieee_802_11.fcs_len = 0;
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pseudo_header->ieee_802_11.decrypted = FALSE;
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pseudo_header->ieee_802_11.datapad = FALSE;
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pseudo_header->ieee_802_11.phy = PHDR_802_11_PHY_UNKNOWN;
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/* Updated below */
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break;
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}
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/* process extra information */
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for (i = 0; i < packet_header->number_of_information_elements; i++) {
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/* read the TLV header */
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if (!wtap_read_bytes(fh, &tlvh, sizeof tlvh, err, err_info))
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return -1;
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offset += (int)sizeof tlvh;
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TLV_HEADER_FROM_LE_IN_PLACE(tlvh);
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if (tlvh.length < sizeof tlvh) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("Observer: bad record (TLV length %u < %lu)",
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tlvh.length, (unsigned long)sizeof tlvh);
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return -1;
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}
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/* process (or skip over) the current TLV */
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switch (tlvh.type) {
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case INFORMATION_TYPE_WIRELESS:
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/* XXX - what if tlvh.length != sizeof wireless_header? */
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if (!wtap_read_bytes(fh, &wireless_header, sizeof wireless_header,
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err, err_info))
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return -1;
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/* set decryption status */
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/* XXX - what other bits are there in conditions? */
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pseudo_header->ieee_802_11.decrypted = (wireless_header.conditions & WIRELESS_WEP_SUCCESS) != 0;
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pseudo_header->ieee_802_11.has_channel = TRUE;
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pseudo_header->ieee_802_11.channel = wireless_header.frequency;
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pseudo_header->ieee_802_11.has_data_rate = TRUE;
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pseudo_header->ieee_802_11.data_rate = wireless_header.rate;
|
|
pseudo_header->ieee_802_11.has_signal_percent = TRUE;
|
|
pseudo_header->ieee_802_11.signal_percent = wireless_header.strengthPercent;
|
|
offset += (int)sizeof wireless_header;
|
|
break;
|
|
default:
|
|
/* skip the TLV data */
|
|
seek_increment = tlvh.length - (int)sizeof tlvh;
|
|
if (seek_increment > 0) {
|
|
if (!wtap_read_bytes(fh, NULL, seek_increment, err, err_info))
|
|
return -1;
|
|
}
|
|
offset += seek_increment;
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static gboolean
|
|
process_packet_header(wtap *wth, packet_entry_header *packet_header,
|
|
struct wtap_pkthdr *phdr, int *err, gchar **err_info)
|
|
{
|
|
/* set the wiretap packet header fields */
|
|
phdr->rec_type = REC_TYPE_PACKET;
|
|
phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
|
|
phdr->pkt_encap = observer_to_wtap_encap(packet_header->network_type);
|
|
if(wth->file_encap == WTAP_ENCAP_FIBRE_CHANNEL_FC2_WITH_FRAME_DELIMS) {
|
|
phdr->len = packet_header->network_size;
|
|
phdr->caplen = packet_header->captured_size;
|
|
} else {
|
|
/*
|
|
* XXX - what are those 4 bytes?
|
|
*
|
|
* The comment in the code said "neglect frame markers for wiretap",
|
|
* but in the captures I've seen, there's no actual data corresponding
|
|
* to them that might be a "frame marker".
|
|
*
|
|
* Instead, the packets had a network_size 4 bytes larger than the
|
|
* captured_size; does the network_size include the CRC, even
|
|
* though it's not included in a capture? If so, most other
|
|
* network analyzers that have a "network size" and a "captured
|
|
* size" don't include the CRC in the "network size" if they
|
|
* don't include the CRC in a full-length captured packet; the
|
|
* "captured size" is less than the "network size" only if a
|
|
* user-specified "snapshot length" caused the packet to be
|
|
* sliced at a particular point.
|
|
*
|
|
* That's the model that wiretap and Wireshark/TShark use, so
|
|
* we implement that model here.
|
|
*/
|
|
if (packet_header->network_size < 4) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("Observer: bad record: Packet length %u < 4",
|
|
packet_header->network_size);
|
|
return FALSE;
|
|
}
|
|
|
|
phdr->len = packet_header->network_size - 4;
|
|
phdr->caplen = MIN(packet_header->captured_size, phdr->len);
|
|
}
|
|
/*
|
|
* The maximum value of packet_header->captured_size is 65535, which
|
|
* is less than WTAP_MAX_PACKET_SIZE_STANDARD will ever be, so we don't need
|
|
* to check it.
|
|
*/
|
|
|
|
/* set the wiretap timestamp, assuming for the moment that Observer encoded it in GMT */
|
|
phdr->ts.secs = (time_t) ((packet_header->nano_seconds_since_2000 / 1000000000) + ansi_to_observer_epoch_offset);
|
|
phdr->ts.nsecs = (int) (packet_header->nano_seconds_since_2000 % 1000000000);
|
|
|
|
/* adjust to local time, if necessary, also accounting for DST if the frame
|
|
was captured while it was in effect */
|
|
if (((observer_dump_private_state*)wth->priv)->time_format == TIME_INFO_LOCAL)
|
|
{
|
|
struct tm *tm;
|
|
struct tm daylight_tm;
|
|
struct tm standard_tm;
|
|
time_t dst_offset;
|
|
|
|
/* the Observer timestamp was encoded as local time, so add a
|
|
correction from local time to GMT */
|
|
phdr->ts.secs += gmt_to_localtime_offset;
|
|
|
|
/* perform a DST adjustment if necessary */
|
|
tm = localtime(&phdr->ts.secs);
|
|
if (tm != NULL) {
|
|
standard_tm = *tm;
|
|
if (standard_tm.tm_isdst > 0) {
|
|
daylight_tm = standard_tm;
|
|
standard_tm.tm_isdst = 0;
|
|
dst_offset = mktime(&standard_tm) - mktime(&daylight_tm);
|
|
phdr->ts.secs -= dst_offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int
|
|
read_packet_data(FILE_T fh, int offset_to_frame, int current_offset_from_packet_header, Buffer *buf,
|
|
int length, int *err, char **err_info)
|
|
{
|
|
int seek_increment;
|
|
int bytes_consumed = 0;
|
|
|
|
/* validate offsets */
|
|
if (offset_to_frame < current_offset_from_packet_header) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("Observer: bad record (offset to packet data %d < %d)",
|
|
offset_to_frame, current_offset_from_packet_header);
|
|
return -1;
|
|
}
|
|
|
|
/* skip to the packet data */
|
|
seek_increment = offset_to_frame - current_offset_from_packet_header;
|
|
if (seek_increment > 0) {
|
|
if (!wtap_read_bytes(fh, NULL, seek_increment, err, err_info)) {
|
|
return -1;
|
|
}
|
|
bytes_consumed += seek_increment;
|
|
}
|
|
|
|
/* set-up the packet buffer */
|
|
ws_buffer_assure_space(buf, length);
|
|
|
|
/* read in the packet data */
|
|
if (!wtap_read_packet_bytes(fh, buf, length, err, err_info))
|
|
return FALSE;
|
|
bytes_consumed += length;
|
|
|
|
return bytes_consumed;
|
|
}
|
|
|
|
static gboolean
|
|
skip_to_next_packet(wtap *wth, int offset_to_next_packet, int current_offset_from_packet_header, int *err,
|
|
char **err_info)
|
|
{
|
|
int seek_increment;
|
|
|
|
/* validate offsets */
|
|
if (offset_to_next_packet < current_offset_from_packet_header) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("Observer: bad record (offset to next packet %d < %d)",
|
|
offset_to_next_packet, current_offset_from_packet_header);
|
|
return FALSE;
|
|
}
|
|
|
|
/* skip to the next packet header */
|
|
seek_increment = offset_to_next_packet - current_offset_from_packet_header;
|
|
if (seek_increment > 0) {
|
|
if (!wtap_read_bytes(wth->fh, NULL, seek_increment, err, err_info))
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Returns 0 if we could write the specified encapsulation type,
|
|
an error indication otherwise. */
|
|
int network_instruments_dump_can_write_encap(int encap)
|
|
{
|
|
/* per-packet encapsulations aren't supported */
|
|
if (encap == WTAP_ENCAP_PER_PACKET)
|
|
return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;
|
|
|
|
if (encap < 0 || (wtap_to_observer_encap(encap) == OBSERVER_UNDEFINED))
|
|
return WTAP_ERR_UNWRITABLE_ENCAP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
|
|
failure. */
|
|
gboolean network_instruments_dump_open(wtap_dumper *wdh, int *err)
|
|
{
|
|
observer_dump_private_state * private_state = NULL;
|
|
capture_file_header file_header;
|
|
|
|
tlv_header comment_header;
|
|
tlv_time_info time_header;
|
|
char comment[64];
|
|
size_t comment_length;
|
|
struct tm * current_time;
|
|
time_t system_time;
|
|
|
|
/* initialize the private state */
|
|
private_state = (observer_dump_private_state *) g_malloc(sizeof(observer_dump_private_state));
|
|
private_state->packet_count = 0;
|
|
private_state->network_type = wtap_to_observer_encap(wdh->encap);
|
|
private_state->time_format = TIME_INFO_GMT;
|
|
|
|
/* populate the fields of wdh */
|
|
wdh->priv = (void *) private_state;
|
|
wdh->subtype_write = observer_dump;
|
|
|
|
/* initialize the file header */
|
|
memset(&file_header, 0x00, sizeof(file_header));
|
|
g_strlcpy(file_header.observer_version, network_instruments_magic, 31);
|
|
file_header.offset_to_first_packet = (guint16)sizeof(file_header);
|
|
file_header.offset_to_first_packet_high_byte = 0;
|
|
|
|
/* create the file comment TLV */
|
|
{
|
|
time(&system_time);
|
|
current_time = localtime(&system_time);
|
|
memset(&comment, 0x00, sizeof(comment));
|
|
if (current_time != NULL)
|
|
g_snprintf(comment, 64, "This capture was saved from Wireshark on %s", asctime(current_time));
|
|
else
|
|
g_snprintf(comment, 64, "This capture was saved from Wireshark");
|
|
comment_length = strlen(comment);
|
|
|
|
comment_header.type = INFORMATION_TYPE_COMMENT;
|
|
comment_header.length = (guint16) (sizeof(comment_header) + comment_length);
|
|
|
|
/* update the file header to account for the comment TLV */
|
|
file_header.number_of_information_elements++;
|
|
file_header.offset_to_first_packet += comment_header.length;
|
|
}
|
|
|
|
/* create the timestamp encoding TLV */
|
|
{
|
|
time_header.type = INFORMATION_TYPE_TIME_INFO;
|
|
time_header.length = (guint16) (sizeof(time_header));
|
|
time_header.time_format = TIME_INFO_GMT;
|
|
|
|
/* update the file header to account for the timestamp encoding TLV */
|
|
file_header.number_of_information_elements++;
|
|
file_header.offset_to_first_packet += time_header.length;
|
|
}
|
|
|
|
/* write the file header, swapping any multibyte fields first */
|
|
CAPTURE_FILE_HEADER_TO_LE_IN_PLACE(file_header);
|
|
if (!wtap_dump_file_write(wdh, &file_header, sizeof(file_header), err)) {
|
|
return FALSE;
|
|
}
|
|
wdh->bytes_dumped += sizeof(file_header);
|
|
|
|
/* write the comment TLV */
|
|
{
|
|
TLV_HEADER_TO_LE_IN_PLACE(comment_header);
|
|
if (!wtap_dump_file_write(wdh, &comment_header, sizeof(comment_header), err)) {
|
|
return FALSE;
|
|
}
|
|
wdh->bytes_dumped += sizeof(comment_header);
|
|
|
|
if (!wtap_dump_file_write(wdh, &comment, comment_length, err)) {
|
|
return FALSE;
|
|
}
|
|
wdh->bytes_dumped += comment_length;
|
|
}
|
|
|
|
/* write the time info TLV */
|
|
{
|
|
TLV_TIME_INFO_TO_LE_IN_PLACE(time_header);
|
|
if (!wtap_dump_file_write(wdh, &time_header, sizeof(time_header), err)) {
|
|
return FALSE;
|
|
}
|
|
wdh->bytes_dumped += sizeof(time_header);
|
|
}
|
|
|
|
init_gmt_to_localtime_offset();
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Write a record for a packet to a dump file.
|
|
Returns TRUE on success, FALSE on failure. */
|
|
static gboolean observer_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
|
|
const guint8 *pd,
|
|
int *err, gchar **err_info _U_)
|
|
{
|
|
observer_dump_private_state * private_state = NULL;
|
|
packet_entry_header packet_header;
|
|
guint64 seconds_since_2000;
|
|
|
|
/* We can only write packet records. */
|
|
if (phdr->rec_type != REC_TYPE_PACKET) {
|
|
*err = WTAP_ERR_UNWRITABLE_REC_TYPE;
|
|
return FALSE;
|
|
}
|
|
|
|
/* The captured size field is 16 bits, so there's a hard limit of
|
|
65535. */
|
|
if (phdr->caplen > 65535) {
|
|
*err = WTAP_ERR_PACKET_TOO_LARGE;
|
|
return FALSE;
|
|
}
|
|
|
|
/* convert the number of seconds since epoch from ANSI-relative to
|
|
Observer-relative */
|
|
if (phdr->ts.secs < ansi_to_observer_epoch_offset) {
|
|
if(phdr->ts.secs > (time_t) 0) {
|
|
seconds_since_2000 = phdr->ts.secs;
|
|
} else {
|
|
seconds_since_2000 = (time_t) 0;
|
|
}
|
|
} else {
|
|
seconds_since_2000 = phdr->ts.secs - ansi_to_observer_epoch_offset;
|
|
}
|
|
|
|
/* populate the fields of the packet header */
|
|
private_state = (observer_dump_private_state *) wdh->priv;
|
|
|
|
memset(&packet_header, 0x00, sizeof(packet_header));
|
|
packet_header.packet_magic = observer_packet_magic;
|
|
packet_header.network_speed = 1000000;
|
|
packet_header.captured_size = (guint16) phdr->caplen;
|
|
packet_header.network_size = (guint16) (phdr->len + 4);
|
|
packet_header.offset_to_frame = sizeof(packet_header);
|
|
/* XXX - what if this doesn't fit in 16 bits? It's not guaranteed to... */
|
|
packet_header.offset_to_next_packet = (guint16)sizeof(packet_header) + phdr->caplen;
|
|
packet_header.network_type = private_state->network_type;
|
|
packet_header.flags = 0x00;
|
|
packet_header.number_of_information_elements = 0;
|
|
packet_header.packet_type = PACKET_TYPE_DATA_PACKET;
|
|
packet_header.packet_number = private_state->packet_count;
|
|
packet_header.original_packet_number = packet_header.packet_number;
|
|
packet_header.nano_seconds_since_2000 = seconds_since_2000 * 1000000000 + phdr->ts.nsecs;
|
|
|
|
private_state->packet_count++;
|
|
|
|
/* write the packet header */
|
|
PACKET_ENTRY_HEADER_TO_LE_IN_PLACE(packet_header);
|
|
if (!wtap_dump_file_write(wdh, &packet_header, sizeof(packet_header), err)) {
|
|
return FALSE;
|
|
}
|
|
wdh->bytes_dumped += sizeof(packet_header);
|
|
|
|
/* write the packet data */
|
|
if (!wtap_dump_file_write(wdh, pd, phdr->caplen, err)) {
|
|
return FALSE;
|
|
}
|
|
wdh->bytes_dumped += phdr->caplen;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gint observer_to_wtap_encap(int observer_encap)
|
|
{
|
|
switch(observer_encap) {
|
|
case OBSERVER_ETHERNET:
|
|
return WTAP_ENCAP_ETHERNET;
|
|
case OBSERVER_TOKENRING:
|
|
return WTAP_ENCAP_TOKEN_RING;
|
|
case OBSERVER_FIBRE_CHANNEL:
|
|
return WTAP_ENCAP_FIBRE_CHANNEL_FC2_WITH_FRAME_DELIMS;
|
|
case OBSERVER_WIRELESS_802_11:
|
|
return WTAP_ENCAP_IEEE_802_11_WITH_RADIO;
|
|
case OBSERVER_UNDEFINED:
|
|
return WTAP_ENCAP_UNKNOWN;
|
|
}
|
|
return WTAP_ENCAP_UNKNOWN;
|
|
}
|
|
|
|
static gint wtap_to_observer_encap(int wtap_encap)
|
|
{
|
|
switch(wtap_encap) {
|
|
case WTAP_ENCAP_ETHERNET:
|
|
return OBSERVER_ETHERNET;
|
|
case WTAP_ENCAP_TOKEN_RING:
|
|
return OBSERVER_TOKENRING;
|
|
case WTAP_ENCAP_FIBRE_CHANNEL_FC2_WITH_FRAME_DELIMS:
|
|
return OBSERVER_FIBRE_CHANNEL;
|
|
case WTAP_ENCAP_UNKNOWN:
|
|
return OBSERVER_UNDEFINED;
|
|
}
|
|
return OBSERVER_UNDEFINED;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|