forked from osmocom/wireshark
9d41c658fe
wtap_seek_read(). svn path=/trunk/; revision=54570
675 lines
20 KiB
C
675 lines
20 KiB
C
/* peektagged.c
|
|
* Routines for opening files in what WildPackets calls the tagged file
|
|
* format in the description of their "PeekRdr Sample Application" (C++
|
|
* source code to read their capture files, downloading of which requires
|
|
* a maintenance contract, so it's not free as in beer and probably not
|
|
* as in speech, either).
|
|
*
|
|
* As that description says, it's used by AiroPeek and AiroPeek NX 2.0
|
|
* and later, EtherPeek 6.0 and later, EtherPeek NX 3.0 and later,
|
|
* EtherPeek VX 1.0 and later, GigaPeek NX 1.0 and later, Omni3 1.0
|
|
* and later (both OmniPeek and the Remote Engine), and WANPeek NX
|
|
* 1.0 and later. They also say it'll be used by future WildPackets
|
|
* products.
|
|
*
|
|
* $Id$
|
|
*
|
|
* Wiretap Library
|
|
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include "wtap-int.h"
|
|
#include "file_wrappers.h"
|
|
#include "buffer.h"
|
|
#include "peektagged.h"
|
|
|
|
/* CREDITS
|
|
*
|
|
* This file decoder could not have been writen without examining
|
|
* http://www.varsanofiev.com/inside/airopeekv9.htm, the help from
|
|
* Martin Regner and Guy Harris, and the etherpeek.c file (as it
|
|
* was called before renaming it to peekclassic.c).
|
|
*/
|
|
|
|
/*
|
|
* Section header.
|
|
*
|
|
* A Peek tagged file consists of multiple sections, each of which begins
|
|
* with a header in the following format.
|
|
*
|
|
* The section ID is a 4-character string saying what type of section
|
|
* it is. The section length is a little-endian field giving the
|
|
* length of the section, in bytes, including the section header
|
|
* itself. The other field of the section header is a little-endian
|
|
* constant that always appears to be 0x00000200.
|
|
*
|
|
* Files we've seen have the following sections, in order:
|
|
*
|
|
* "\177vers" - version information. The contents are XML, giving
|
|
* the file format version and application version information.
|
|
*
|
|
* "sess" - capture session information. The contents are XML, giving
|
|
* various information about the capture session.
|
|
*
|
|
* "pkts" - captured packets. The contents are binary records, one for
|
|
* each packet, with the record being a list of tagged values followed
|
|
* by the raw packet data.
|
|
*/
|
|
typedef struct peektagged_section_header {
|
|
gint8 section_id[4]; /* string identifying the section */
|
|
guint32 section_len; /* little-endian section length */
|
|
guint32 section_const; /* little-endian 0x00000200 */
|
|
} peektagged_section_header_t;
|
|
|
|
/*
|
|
* Network subtype values.
|
|
*
|
|
* XXX - do different network subtype values for 802.11 indicate different
|
|
* network adapter types, with some adapters supplying the FCS and others
|
|
* not supplying the FCS?
|
|
*/
|
|
#define PEEKTAGGED_NST_ETHERNET 0
|
|
#define PEEKTAGGED_NST_802_11 1 /* 802.11 with 0's at the end */
|
|
#define PEEKTAGGED_NST_802_11_2 2 /* 802.11 with 0's at the end */
|
|
#define PEEKTAGGED_NST_802_11_WITH_FCS 3 /* 802.11 with FCS at the end */
|
|
|
|
/* tags for fields in packet header */
|
|
#define TAG_PEEKTAGGED_LENGTH 0x0000
|
|
#define TAG_PEEKTAGGED_TIMESTAMP_LOWER 0x0001
|
|
#define TAG_PEEKTAGGED_TIMESTAMP_UPPER 0x0002
|
|
#define TAG_PEEKTAGGED_FLAGS_AND_STATUS 0x0003
|
|
#define TAG_PEEKTAGGED_CHANNEL 0x0004
|
|
#define TAG_PEEKTAGGED_RATE 0x0005
|
|
#define TAG_PEEKTAGGED_SIGNAL_PERC 0x0006
|
|
#define TAG_PEEKTAGGED_SIGNAL_DBM 0x0007
|
|
#define TAG_PEEKTAGGED_NOISE_PERC 0x0008
|
|
#define TAG_PEEKTAGGED_NOISE_DBM 0x0009
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x000A 0x000A
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x000D 0x000D /* frequency? */
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x000E 0x000E
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x000F 0x000F /* 000F-0013 - dBm values? */
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x0010 0x0010
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x0011 0x0011
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x0012 0x0012
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x0013 0x0013
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x0014 0x0014
|
|
#define TAG_PEEKTAGGED_UNKNOWN_0x0015 0x0015
|
|
|
|
#define TAG_PEEKTAGGED_SLICE_LENGTH 0xffff
|
|
|
|
/* 64-bit time in nanoseconds from the (Windows FILETIME) epoch */
|
|
typedef struct peektagged_utime {
|
|
guint32 upper;
|
|
guint32 lower;
|
|
} peektagged_utime;
|
|
|
|
typedef struct {
|
|
gboolean has_fcs;
|
|
} peektagged_t;
|
|
|
|
static gboolean peektagged_read(wtap *wth, int *err, gchar **err_info,
|
|
gint64 *data_offset);
|
|
static gboolean peektagged_seek_read(wtap *wth, gint64 seek_off,
|
|
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
|
|
|
|
static int wtap_file_read_pattern (wtap *wth, const char *pattern, int *err,
|
|
gchar **err_info)
|
|
{
|
|
int c;
|
|
const char *cp;
|
|
|
|
cp = pattern;
|
|
while (*cp)
|
|
{
|
|
c = file_getc(wth->fh);
|
|
if (c == EOF)
|
|
{
|
|
*err = file_error(wth->fh, err_info);
|
|
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
|
|
return -1; /* error */
|
|
return 0; /* EOF */
|
|
}
|
|
if (c == *cp)
|
|
cp++;
|
|
else
|
|
{
|
|
if (c == pattern[0])
|
|
cp = &pattern[1];
|
|
else
|
|
cp = pattern;
|
|
}
|
|
}
|
|
return (*cp == '\0' ? 1 : 0);
|
|
}
|
|
|
|
|
|
static int wtap_file_read_till_separator (wtap *wth, char *buffer, int buflen,
|
|
const char *separators, int *err,
|
|
gchar **err_info)
|
|
{
|
|
int c;
|
|
char *cp;
|
|
int i;
|
|
|
|
for (cp = buffer, i = 0; i < buflen; i++, cp++)
|
|
{
|
|
c = file_getc(wth->fh);
|
|
if (c == EOF)
|
|
{
|
|
*err = file_error(wth->fh, err_info);
|
|
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
|
|
return -1; /* error */
|
|
return 0; /* EOF */
|
|
}
|
|
if (strchr (separators, c) != NULL)
|
|
{
|
|
*cp = '\0';
|
|
break;
|
|
}
|
|
else
|
|
*cp = c;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
|
|
static int wtap_file_read_number (wtap *wth, guint32 *num, int *err,
|
|
gchar **err_info)
|
|
{
|
|
int ret;
|
|
char str_num[12];
|
|
unsigned long value;
|
|
char *p;
|
|
|
|
ret = wtap_file_read_till_separator (wth, str_num, sizeof (str_num)-1, "<",
|
|
err, err_info);
|
|
if (ret != 1) {
|
|
/* 0 means EOF, which means "not a valid Peek tagged file";
|
|
-1 means error, and "err" has been set. */
|
|
return ret;
|
|
}
|
|
value = strtoul (str_num, &p, 10);
|
|
if (p == str_num || value > G_MAXUINT32)
|
|
return 0;
|
|
*num = (guint32)value;
|
|
return 1;
|
|
}
|
|
|
|
|
|
int peektagged_open(wtap *wth, int *err, gchar **err_info)
|
|
{
|
|
peektagged_section_header_t ap_hdr;
|
|
int bytes_read;
|
|
int ret;
|
|
guint32 fileVersion;
|
|
guint32 mediaType;
|
|
guint32 mediaSubType = 0;
|
|
int file_encap;
|
|
static const int peektagged_encap[] = {
|
|
WTAP_ENCAP_ETHERNET,
|
|
WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
|
|
WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
|
|
WTAP_ENCAP_IEEE_802_11_WITH_RADIO
|
|
};
|
|
#define NUM_PEEKTAGGED_ENCAPS (sizeof peektagged_encap / sizeof peektagged_encap[0])
|
|
peektagged_t *peektagged;
|
|
|
|
bytes_read = file_read(&ap_hdr, (int)sizeof(ap_hdr), wth->fh);
|
|
if (bytes_read != (int)sizeof(ap_hdr)) {
|
|
*err = file_error(wth->fh, err_info);
|
|
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
if (memcmp (ap_hdr.section_id, "\177ver", sizeof(ap_hdr.section_id)) != 0)
|
|
return 0; /* doesn't begin with a "\177ver" section */
|
|
|
|
/*
|
|
* XXX - we should get the length of the "\177ver" section, check
|
|
* that it's followed by a little-endian 0x00000200, and then,
|
|
* when reading the XML, make sure we don't go past the end of
|
|
* that section, and skip to the end of that section when
|
|
* we have the file version (and possibly check to make sure all
|
|
* tags are properly opened and closed).
|
|
*/
|
|
ret = wtap_file_read_pattern (wth, "<FileVersion>", err, err_info);
|
|
if (ret != 1) {
|
|
/* 0 means EOF, which means "not a valid Peek tagged file";
|
|
-1 means error, and "err" has been set. */
|
|
return ret;
|
|
}
|
|
ret = wtap_file_read_number (wth, &fileVersion, err, err_info);
|
|
if (ret != 1) {
|
|
/* 0 means EOF, which means "not a valid Peek tagged file";
|
|
-1 means error, and "err" has been set. */
|
|
return ret;
|
|
}
|
|
|
|
/* If we got this far, we assume it's a Peek tagged file. */
|
|
if (fileVersion != 9) {
|
|
/* We only support version 9. */
|
|
*err = WTAP_ERR_UNSUPPORTED;
|
|
*err_info = g_strdup_printf("peektagged: version %u unsupported",
|
|
fileVersion);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* XXX - once we've skipped the "\177ver" section, we should
|
|
* check for a "sess" section and fail if we don't see it.
|
|
* Then we should get the length of the "sess" section, check
|
|
* that it's followed by a little-endian 0x00000200, and then,
|
|
* when reading the XML, make sure we don't go past the end of
|
|
* that section, and skip to the end of the section when
|
|
* we have the file version (and possibly check to make sure all
|
|
* tags are properly opened and closed).
|
|
*/
|
|
ret = wtap_file_read_pattern (wth, "<MediaType>", err, err_info);
|
|
if (ret == -1)
|
|
return -1;
|
|
if (ret == 0) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: <MediaType> tag not found");
|
|
return -1;
|
|
}
|
|
/* XXX - this appears to be 0 in both the EtherPeek and AiroPeek
|
|
files we've seen; should we require it to be 0? */
|
|
ret = wtap_file_read_number (wth, &mediaType, err, err_info);
|
|
if (ret == -1)
|
|
return -1;
|
|
if (ret == 0) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: <MediaType> value not found");
|
|
return -1;
|
|
}
|
|
|
|
ret = wtap_file_read_pattern (wth, "<MediaSubType>", err, err_info);
|
|
if (ret == -1)
|
|
return -1;
|
|
if (ret == 0) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: <MediaSubType> tag not found");
|
|
return -1;
|
|
}
|
|
ret = wtap_file_read_number (wth, &mediaSubType, err, err_info);
|
|
if (ret == -1)
|
|
return -1;
|
|
if (ret == 0) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: <MediaSubType> value not found");
|
|
return -1;
|
|
}
|
|
if (mediaSubType >= NUM_PEEKTAGGED_ENCAPS
|
|
|| peektagged_encap[mediaSubType] == WTAP_ENCAP_UNKNOWN) {
|
|
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
|
|
*err_info = g_strdup_printf("peektagged: network type %u unknown or unsupported",
|
|
mediaSubType);
|
|
return -1;
|
|
}
|
|
|
|
ret = wtap_file_read_pattern (wth, "pkts", err, err_info);
|
|
if (ret == -1)
|
|
return -1;
|
|
if (ret == 0) {
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
return -1;
|
|
}
|
|
|
|
/* skip 8 zero bytes */
|
|
if (file_seek (wth->fh, 8L, SEEK_CUR, err) == -1)
|
|
return 0;
|
|
|
|
/*
|
|
* This is an Peek tagged file.
|
|
*/
|
|
file_encap = peektagged_encap[mediaSubType];
|
|
|
|
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PEEKTAGGED;
|
|
wth->file_encap = file_encap;
|
|
wth->subtype_read = peektagged_read;
|
|
wth->subtype_seek_read = peektagged_seek_read;
|
|
wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
|
|
|
|
peektagged = (peektagged_t *)g_malloc(sizeof(peektagged_t));
|
|
wth->priv = (void *)peektagged;
|
|
switch (mediaSubType) {
|
|
|
|
case PEEKTAGGED_NST_ETHERNET:
|
|
case PEEKTAGGED_NST_802_11:
|
|
case PEEKTAGGED_NST_802_11_2:
|
|
peektagged->has_fcs = FALSE;
|
|
break;
|
|
|
|
case PEEKTAGGED_NST_802_11_WITH_FCS:
|
|
peektagged->has_fcs = TRUE;
|
|
break;
|
|
}
|
|
|
|
wth->snapshot_length = 0; /* not available in header */
|
|
|
|
return 1;
|
|
}
|
|
|
|
typedef struct {
|
|
guint32 length;
|
|
guint32 sliceLength;
|
|
peektagged_utime timestamp;
|
|
struct ieee_802_11_phdr ieee_802_11;
|
|
} hdr_info_t;
|
|
|
|
/*
|
|
* Time stamps appear to be in nanoseconds since the Windows epoch
|
|
* as used in FILETIMEs, i.e. midnight, January 1, 1601.
|
|
*
|
|
* This magic number came from "nt_time_to_nstime()" in "packet-smb.c".
|
|
* 1970-1601 is 369; I'm not sure what the extra 3 days and 6 hours are
|
|
* that are being subtracted.
|
|
*/
|
|
#define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
|
|
|
|
/*
|
|
* Read the packet.
|
|
*
|
|
* XXX - we should supply the additional radio information;
|
|
* the pseudo-header should probably be supplied in a fashion
|
|
* similar to the radiotap radio header, so that the 802.11
|
|
* dissector can determine which, if any, information items
|
|
* are present.
|
|
*/
|
|
static int
|
|
peektagged_read_packet(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
|
|
Buffer *buf, int *err, gchar **err_info)
|
|
{
|
|
peektagged_t *peektagged = (peektagged_t *)wth->priv;
|
|
hdr_info_t hdr_info;
|
|
int header_len = 0;
|
|
int bytes_read;
|
|
guint8 tag_value[6];
|
|
guint16 tag;
|
|
gboolean saw_length = FALSE;
|
|
gboolean saw_timestamp_lower = FALSE;
|
|
gboolean saw_timestamp_upper = FALSE;
|
|
int skip_len = 0;
|
|
double t;
|
|
|
|
memset(&hdr_info, 0, sizeof(hdr_info_t));
|
|
|
|
/* Extract the fields from the packet header */
|
|
do {
|
|
/* Get the tag and value.
|
|
XXX - this assumes all values are 4 bytes long. */
|
|
bytes_read = file_read(tag_value, sizeof tag_value, fh);
|
|
if (bytes_read != (int) sizeof tag_value) {
|
|
*err = file_error(fh, err_info);
|
|
if (*err == 0) {
|
|
if (bytes_read > 0)
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
else if (bytes_read == 0) {
|
|
/*
|
|
* Short read if we've read something already;
|
|
* just an EOF if we haven't.
|
|
*/
|
|
if (header_len != 0)
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
header_len += (int) sizeof(tag_value);
|
|
tag = pletoh16(&tag_value[0]);
|
|
switch (tag) {
|
|
|
|
case TAG_PEEKTAGGED_LENGTH:
|
|
if (saw_length) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: record has two length fields");
|
|
return -1;
|
|
}
|
|
hdr_info.length = pletoh32(&tag_value[2]);
|
|
saw_length = TRUE;
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_TIMESTAMP_LOWER:
|
|
if (saw_timestamp_lower) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: record has two timestamp-lower fields");
|
|
return -1;
|
|
}
|
|
hdr_info.timestamp.lower = pletoh32(&tag_value[2]);
|
|
saw_timestamp_lower = TRUE;
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_TIMESTAMP_UPPER:
|
|
if (saw_timestamp_upper) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: record has two timestamp-upper fields");
|
|
return -1;
|
|
}
|
|
hdr_info.timestamp.upper = pletoh32(&tag_value[2]);
|
|
saw_timestamp_upper = TRUE;
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_FLAGS_AND_STATUS:
|
|
/* XXX - not used yet */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_CHANNEL:
|
|
hdr_info.ieee_802_11.channel = pletoh32(&tag_value[2]);
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_RATE:
|
|
hdr_info.ieee_802_11.data_rate = pletoh32(&tag_value[2]);
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_SIGNAL_PERC:
|
|
hdr_info.ieee_802_11.signal_level = pletoh32(&tag_value[2]);
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_SIGNAL_DBM:
|
|
/* XXX - not used yet */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_NOISE_PERC:
|
|
/* XXX - not used yet */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_NOISE_DBM:
|
|
/* XXX - not used yet */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x000A:
|
|
/* XXX - seen in an OmniPeek 802.11n capture; value unknown */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x000D:
|
|
/* XXX - seen in an EtherPeek capture; value unknown */
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; frequency? */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x000E:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; value unknown */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x000F:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; dBm value? */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x0010:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; dBm value? */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x0011:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; dBm value? */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x0012:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; dBm value? */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x0013:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; dBm value? */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x0014:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; value unknown */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_UNKNOWN_0x0015:
|
|
/* XXX - seen in an AiroPeek/OmniPeek capture; value unknown */
|
|
break;
|
|
|
|
case TAG_PEEKTAGGED_SLICE_LENGTH:
|
|
hdr_info.sliceLength = pletoh32(&tag_value[2]);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
} while (tag != TAG_PEEKTAGGED_SLICE_LENGTH); /* last tag */
|
|
|
|
if (!saw_length) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: record has no length field");
|
|
return -1;
|
|
}
|
|
if (!saw_timestamp_lower) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: record has no timestamp-lower field");
|
|
return -1;
|
|
}
|
|
if (!saw_timestamp_upper) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("peektagged: record has no timestamp-upper field");
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* If sliceLength is 0, force it to be the actual length of the packet.
|
|
*/
|
|
if (hdr_info.sliceLength == 0)
|
|
hdr_info.sliceLength = hdr_info.length;
|
|
|
|
if (hdr_info.sliceLength > WTAP_MAX_PACKET_SIZE) {
|
|
/*
|
|
* Probably a corrupt capture file; don't blow up trying
|
|
* to allocate space for an immensely-large packet.
|
|
*/
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("peektagged: File has %u-byte packet, bigger than maximum of %u",
|
|
hdr_info.sliceLength, WTAP_MAX_PACKET_SIZE);
|
|
return -1;
|
|
}
|
|
|
|
phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
|
|
phdr->len = hdr_info.length;
|
|
phdr->caplen = hdr_info.sliceLength;
|
|
|
|
/* calculate and fill in packet time stamp */
|
|
t = (double) hdr_info.timestamp.lower +
|
|
(double) hdr_info.timestamp.upper * 4294967296.0;
|
|
t *= 1.0e-9;
|
|
t -= TIME_FIXUP_CONSTANT;
|
|
phdr->ts.secs = (time_t) t;
|
|
phdr->ts.nsecs = (guint32) ((t - phdr->ts.secs)*1000000000);
|
|
|
|
switch (wth->file_encap) {
|
|
|
|
case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
|
|
phdr->pseudo_header.ieee_802_11 = hdr_info.ieee_802_11;
|
|
if (peektagged->has_fcs)
|
|
phdr->pseudo_header.ieee_802_11.fcs_len = 4;
|
|
else {
|
|
if (phdr->len < 4 || phdr->caplen < 4) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("peektagged: 802.11 packet has length < 4");
|
|
return FALSE;
|
|
}
|
|
phdr->pseudo_header.ieee_802_11.fcs_len = 0;
|
|
phdr->len -= 4;
|
|
phdr->caplen -= 4;
|
|
skip_len = 4;
|
|
}
|
|
phdr->pseudo_header.ieee_802_11.decrypted = FALSE;
|
|
break;
|
|
|
|
case WTAP_ENCAP_ETHERNET:
|
|
/*
|
|
* The last 4 bytes appear to be 0 in the captures I've seen;
|
|
* are there any captures where it's an FCS?
|
|
*/
|
|
if (phdr->len < 4 || phdr->caplen < 4) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup_printf("peektagged: Ethernet packet has length < 4");
|
|
return FALSE;
|
|
}
|
|
phdr->pseudo_header.eth.fcs_len = 0;
|
|
phdr->len -= 4;
|
|
phdr->caplen -= 4;
|
|
skip_len = 4;
|
|
break;
|
|
}
|
|
|
|
/* Read the packet data. */
|
|
if (!wtap_read_packet_bytes(fh, buf, phdr->caplen, err, err_info))
|
|
return -1;
|
|
|
|
return skip_len;
|
|
}
|
|
|
|
static gboolean peektagged_read(wtap *wth, int *err, gchar **err_info,
|
|
gint64 *data_offset)
|
|
{
|
|
int skip_len;
|
|
|
|
*data_offset = file_tell(wth->fh);
|
|
|
|
/* Read the packet. */
|
|
skip_len = peektagged_read_packet(wth, wth->fh, &wth->phdr,
|
|
wth->frame_buffer, err, err_info);
|
|
if (skip_len == -1)
|
|
return FALSE;
|
|
|
|
if (skip_len != 0) {
|
|
/* Skip extra junk at the end of the packet data. */
|
|
if (!file_skip(wth->fh, skip_len, err))
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
peektagged_seek_read(wtap *wth, gint64 seek_off,
|
|
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
|
|
{
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
return FALSE;
|
|
|
|
/* Read the packet. */
|
|
if (peektagged_read_packet(wth, wth->random_fh, phdr, buf, err, err_info) == -1) {
|
|
if (*err == 0)
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|