forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
by the gunzipping code. Have it also supply a err_info string, and report it. Have file_error() supply an err_info string. Put "the file" - or, for WTAP_ERR_DECOMPRESS, "the compressed file", to suggest a decompression error - into the rawshark and tshark errors, along the lines of what other programs print. Fix a case in the Netscaler code where we weren't fetching the error code on a read failure. svn path=/trunk/; revision=36748
602 lines
16 KiB
C
602 lines
16 KiB
C
/* airopeek9.c
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* Routines for opening EtherPeek and AiroPeek V9 files
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*
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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "airopeek9.h"
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/* CREDITS
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*
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* This file decoder could not have been writen without examining
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* http://www.varsanofiev.com/inside/airopeekv9.htm, the help from
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* Martin Regner and Guy Harris, and the etherpeek.c file.
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*/
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/*
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* NOTE: it says "airopeek" because the first files seen that use this
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* format were AiroPeek files; however, EtherPeek files using it have
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* also been seen.
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*/
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/* section header */
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typedef struct airopeek_section_header {
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gint8 section_id[4];
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guint32 section_len;
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guint32 section_const;
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} airopeek_section_header_t;
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/*
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* Network subtype values.
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*
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* XXX - do different network subtype values for 802.11 indicate different
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* network adapter types, with some adapters supplying the FCS and others
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* not supplying the FCS?
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*/
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#define AIROPEEK_V9_NST_ETHERNET 0
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#define AIROPEEK_V9_NST_802_11 1 /* 802.11 with 0's at the end */
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#define AIROPEEK_V9_NST_802_11_2 2 /* 802.11 with 0's at the end */
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#define AIROPEEK_V9_NST_802_11_WITH_FCS 3 /* 802.11 with FCS at the end */
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/* tags for fields in packet header */
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#define TAG_AIROPEEK_V9_LENGTH 0x0000
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#define TAG_AIROPEEK_V9_TIMESTAMP_LOWER 0x0001
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#define TAG_AIROPEEK_V9_TIMESTAMP_UPPER 0x0002
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#define TAG_AIROPEEK_V9_FLAGS_AND_STATUS 0x0003
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#define TAG_AIROPEEK_V9_CHANNEL 0x0004
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#define TAG_AIROPEEK_V9_RATE 0x0005
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#define TAG_AIROPEEK_V9_SIGNAL_PERC 0x0006
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#define TAG_AIROPEEK_V9_SIGNAL_DBM 0x0007
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#define TAG_AIROPEEK_V9_NOISE_PERC 0x0008
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#define TAG_AIROPEEK_V9_NOISE_DBM 0x0009
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#define TAG_AIROPEEK_V9_UNKNOWN_0x000D 0x000D
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#define TAG_AIROPEEK_V9_SLICE_LENGTH 0xffff
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/* 64-bit time in nanoseconds from the (Windows FILETIME) epoch */
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typedef struct airopeek_utime {
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guint32 upper;
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guint32 lower;
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} airopeek_utime;
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typedef struct {
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gboolean has_fcs;
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} airopeek9_t;
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static gboolean airopeekv9_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean airopeekv9_seek_read(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
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int *err, gchar **err_info);
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static int wtap_file_read_pattern (wtap *wth, const char *pattern, int *err,
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gchar **err_info)
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{
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int c;
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const char *cp;
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cp = pattern;
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while (*cp)
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{
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c = file_getc(wth->fh);
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if (c == EOF) {
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if (file_eof(wth->fh))
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return 0; /* EOF */
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else {
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*err = file_error(wth->fh, err_info);
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return -1; /* error */
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}
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}
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if (c == *cp)
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cp++;
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else
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{
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if (c == pattern[0])
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cp = &pattern[1];
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else
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cp = pattern;
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}
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}
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return (*cp == '\0' ? 1 : 0);
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}
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static int wtap_file_read_till_separator (wtap *wth, char *buffer, int buflen,
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const char *separators, int *err,
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gchar **err_info)
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{
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int c;
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char *cp;
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int i;
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for (cp = buffer, i = 0; i < buflen; i++, cp++)
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{
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c = file_getc(wth->fh);
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if (c == EOF) {
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if (file_eof(wth->fh))
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return 0; /* EOF */
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else {
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*err = file_error(wth->fh, err_info);
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return -1; /* error */
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}
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}
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if (strchr (separators, c) != NULL)
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{
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*cp = '\0';
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break;
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}
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else
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*cp = c;
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}
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return i;
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}
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static int wtap_file_read_number (wtap *wth, guint32 *num, int *err,
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gchar **err_info)
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{
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int ret;
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char str_num[12];
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unsigned long value;
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char *p;
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ret = wtap_file_read_till_separator (wth, str_num, sizeof (str_num)-1, "<",
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err, err_info);
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if (ret != 1) {
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/* 0 means EOF, which means "not a valid AiroPeek V9 file";
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-1 means error, and "err" has been set. */
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return ret;
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}
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value = strtoul (str_num, &p, 10);
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if (p == str_num || value > G_MAXUINT32)
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return 0;
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*num = (guint32)value;
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return 1;
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}
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int airopeek9_open(wtap *wth, int *err, gchar **err_info)
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{
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airopeek_section_header_t ap_hdr;
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int ret;
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guint32 fileVersion;
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guint32 mediaType;
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guint32 mediaSubType = 0;
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int file_encap;
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static const int airopeek9_encap[] = {
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WTAP_ENCAP_ETHERNET,
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WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
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WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
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WTAP_ENCAP_IEEE_802_11_WITH_RADIO
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};
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#define NUM_AIROPEEK9_ENCAPS (sizeof airopeek9_encap / sizeof airopeek9_encap[0])
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airopeek9_t *airopeek9;
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wtap_file_read_unknown_bytes(&ap_hdr, sizeof(ap_hdr), wth->fh, err,
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err_info);
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if (memcmp (ap_hdr.section_id, "\177ver", sizeof(ap_hdr.section_id)) != 0)
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return 0; /* doesn't begin with a "\177ver" section */
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/*
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* XXX - we should get the length of the "\177ver" section, check
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* that it's followed by a little-endian 0x00000200, and then,
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* when reading the XML, make sure we don't go past the end of
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* that section, and skip to the end of that section when
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* we have the file version (and possibly check to make sure all
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* tags are properly opened and closed).
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*/
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ret = wtap_file_read_pattern (wth, "<FileVersion>", err, err_info);
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if (ret != 1) {
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/* 0 means EOF, which means "not a valid AiroPeek V9 file";
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-1 means error, and "err" has been set. */
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return ret;
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}
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ret = wtap_file_read_number (wth, &fileVersion, err, err_info);
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if (ret != 1) {
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/* 0 means EOF, which means "not a valid AiroPeek V9 file";
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-1 means error, and "err" has been set. */
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return ret;
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}
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/* If we got this far, we assume it's an AiroPeek V9 file. */
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if (fileVersion != 9) {
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/* We only support version 9. */
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup_printf("airopeekv9: version %u unsupported",
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fileVersion);
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return -1;
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}
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/*
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* XXX - once we've skipped the "\177ver" section, we should
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* check for a "sess" section and fail if we don't see it.
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* Then we should get the length of the "sess" section, check
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* that it's followed by a little-endian 0x00000200, and then,
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* when reading the XML, make sure we don't go past the end of
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* that section, and skip to the end of the section when
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* we have the file version (and possibly check to make sure all
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* tags are properly opened and closed).
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*/
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ret = wtap_file_read_pattern (wth, "<MediaType>", err, err_info);
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if (ret == -1)
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return -1;
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if (ret == 0) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("airopeekv9: <MediaType> tag not found");
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return -1;
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}
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/* XXX - this appears to be 0 in both the EtherPeek and AiroPeek
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files we've seen; should we require it to be 0? */
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ret = wtap_file_read_number (wth, &mediaType, err, err_info);
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if (ret == -1)
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return -1;
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if (ret == 0) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("airopeekv9: <MediaType> value not found");
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return -1;
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}
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ret = wtap_file_read_pattern (wth, "<MediaSubType>", err, err_info);
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if (ret == -1)
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return -1;
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if (ret == 0) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("airopeekv9: <MediaSubType> tag not found");
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return -1;
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}
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ret = wtap_file_read_number (wth, &mediaSubType, err, err_info);
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if (ret == -1)
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return -1;
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if (ret == 0) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("airopeekv9: <MediaSubType> value not found");
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return -1;
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}
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if (mediaSubType >= NUM_AIROPEEK9_ENCAPS
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|| airopeek9_encap[mediaSubType] == WTAP_ENCAP_UNKNOWN) {
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*err = WTAP_ERR_UNSUPPORTED_ENCAP;
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*err_info = g_strdup_printf("airopeekv9: network type %u unknown or unsupported",
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mediaSubType);
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return -1;
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}
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ret = wtap_file_read_pattern (wth, "pkts", err, err_info);
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if (ret == -1)
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return -1;
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if (ret == 0) {
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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/* skip 8 zero bytes */
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if (file_seek (wth->fh, 8L, SEEK_CUR, err) == -1)
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return 0;
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/*
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* This is an EtherPeek or AiroPeek V9 file.
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*/
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wth->data_offset = file_tell (wth->fh);
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file_encap = airopeek9_encap[mediaSubType];
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wth->file_type = WTAP_FILE_AIROPEEK_V9;
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wth->file_encap = file_encap;
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wth->subtype_read = airopeekv9_read;
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wth->subtype_seek_read = airopeekv9_seek_read;
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wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
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airopeek9 = (airopeek9_t *)g_malloc(sizeof(airopeek9_t));
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wth->priv = (void *)airopeek9;
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switch (mediaSubType) {
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case AIROPEEK_V9_NST_ETHERNET:
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case AIROPEEK_V9_NST_802_11:
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case AIROPEEK_V9_NST_802_11_2:
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airopeek9->has_fcs = FALSE;
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break;
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case AIROPEEK_V9_NST_802_11_WITH_FCS:
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airopeek9->has_fcs = TRUE;
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break;
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}
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wth->snapshot_length = 0; /* not available in header */
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return 1;
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}
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typedef struct {
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guint32 length;
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guint32 sliceLength;
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airopeek_utime timestamp;
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struct ieee_802_11_phdr ieee_802_11;
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} hdr_info_t;
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/*
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* Process the packet header.
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*
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* XXX - we should supply the additional radio information;
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* the pseudo-header should probably be supplied in a fashion
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* similar to the new BSD radio header, so that the 802.11
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* dissector can determine which, if any, information items
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* are present.
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*/
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static int
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airopeekv9_process_header(FILE_T fh, hdr_info_t *hdr_info, int *err,
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gchar **err_info)
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{
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int header_len = 0;
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int bytes_read;
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guint8 tag_value[6];
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guint16 tag;
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gboolean saw_length = FALSE;
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gboolean saw_timestamp_lower = FALSE;
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gboolean saw_timestamp_upper = FALSE;
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/* Extract the fields from the packet header */
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do {
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/* Get the tag and value.
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XXX - this assumes all values are 4 bytes long. */
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bytes_read = file_read(tag_value, sizeof tag_value, fh);
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if (bytes_read != (int) sizeof tag_value) {
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*err = file_error(fh, err_info);
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if (*err == 0) {
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if (bytes_read > 0)
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*err = WTAP_ERR_SHORT_READ;
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else if (bytes_read == 0) {
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/*
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* Short read if we've read something already;
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* just an EOF if we haven't.
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*/
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if (header_len != 0)
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*err = WTAP_ERR_SHORT_READ;
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}
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}
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return 0;
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}
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header_len += (int) sizeof(tag_value);
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tag = pletohs(&tag_value[0]);
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switch (tag) {
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case TAG_AIROPEEK_V9_LENGTH:
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if (saw_length) {
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("airopeekv9: record has two length fields");
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return 0;
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}
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hdr_info->length = pletohl(&tag_value[2]);
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saw_length = TRUE;
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break;
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case TAG_AIROPEEK_V9_TIMESTAMP_LOWER:
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if (saw_timestamp_lower) {
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("airopeekv9: record has two timestamp-lower fields");
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return 0;
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}
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hdr_info->timestamp.lower = pletohl(&tag_value[2]);
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saw_timestamp_lower = TRUE;
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break;
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case TAG_AIROPEEK_V9_TIMESTAMP_UPPER:
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if (saw_timestamp_upper) {
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("airopeekv9: record has two timestamp-upper fields");
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return 0;
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}
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hdr_info->timestamp.upper = pletohl(&tag_value[2]);
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saw_timestamp_upper = TRUE;
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break;
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case TAG_AIROPEEK_V9_FLAGS_AND_STATUS:
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/* XXX - not used yet */
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break;
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case TAG_AIROPEEK_V9_CHANNEL:
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hdr_info->ieee_802_11.channel = pletohl(&tag_value[2]);
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break;
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case TAG_AIROPEEK_V9_RATE:
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hdr_info->ieee_802_11.data_rate = pletohl(&tag_value[2]);
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break;
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case TAG_AIROPEEK_V9_SIGNAL_PERC:
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hdr_info->ieee_802_11.signal_level = pletohl(&tag_value[2]);
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break;
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case TAG_AIROPEEK_V9_SIGNAL_DBM:
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/* XXX - not used yet */
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break;
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case TAG_AIROPEEK_V9_NOISE_PERC:
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/* XXX - not used yet */
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break;
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case TAG_AIROPEEK_V9_NOISE_DBM:
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/* XXX - not used yet */
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break;
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case TAG_AIROPEEK_V9_UNKNOWN_0x000D:
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/* XXX - seen in an EtherPeek capture; value unknown */
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break;
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case TAG_AIROPEEK_V9_SLICE_LENGTH:
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hdr_info->sliceLength = pletohl(&tag_value[2]);
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break;
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default:
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break;
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}
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} while (tag != TAG_AIROPEEK_V9_SLICE_LENGTH); /* last tag */
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if (!saw_length) {
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("airopeekv9: record has no length field");
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return 0;
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}
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if (!saw_timestamp_lower) {
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("airopeekv9: record has no timestamp-lower field");
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return 0;
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}
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if (!saw_timestamp_upper) {
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("airopeekv9: record has no timestamp-upper field");
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return 0;
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}
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return header_len;
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}
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/*
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* Time stamps appear to be in nanoseconds since the Windows epoch
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* as used in FILETIMEs, i.e. midnight, January 1, 1601.
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*
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* 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))
|
|
|
|
static gboolean airopeekv9_read(wtap *wth, int *err, gchar **err_info,
|
|
gint64 *data_offset)
|
|
{
|
|
airopeek9_t *airopeek9 = (airopeek9_t *)wth->priv;
|
|
hdr_info_t hdr_info;
|
|
int hdrlen;
|
|
double t;
|
|
|
|
*data_offset = wth->data_offset;
|
|
|
|
/* Process the packet header. */
|
|
hdrlen = airopeekv9_process_header(wth->fh, &hdr_info, err, err_info);
|
|
if (hdrlen == 0)
|
|
return FALSE;
|
|
wth->data_offset += hdrlen;
|
|
|
|
/* force sliceLength to be the actual length of the packet */
|
|
if (hdr_info.sliceLength == 0)
|
|
hdr_info.sliceLength = hdr_info.length;
|
|
|
|
/* fill in packet header length values before slicelength may be
|
|
adjusted */
|
|
wth->phdr.len = hdr_info.length;
|
|
wth->phdr.caplen = hdr_info.sliceLength;
|
|
|
|
/* read the frame data */
|
|
buffer_assure_space(wth->frame_buffer, hdr_info.sliceLength);
|
|
wtap_file_read_expected_bytes(buffer_start_ptr(wth->frame_buffer),
|
|
hdr_info.sliceLength, wth->fh, err,
|
|
err_info);
|
|
wth->data_offset += hdr_info.sliceLength;
|
|
|
|
/* recalculate 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;
|
|
wth->phdr.ts.secs = (time_t) t;
|
|
wth->phdr.ts.nsecs = (guint32) ((t - wth->phdr.ts.secs)*1000000000);
|
|
|
|
switch (wth->file_encap) {
|
|
|
|
case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
|
|
/*
|
|
* The last 4 bytes sometimes contains the FCS but on a lot of
|
|
* interfaces these are zero. Is there some way to determine
|
|
* from the packet header whether it's an FCS or not?
|
|
*
|
|
* For now, we just discard those bytes; if we can determine
|
|
* whether it's an FCS or not, we should use that to determine
|
|
* whether to supply it as an FCS or discard it.
|
|
*/
|
|
wth->pseudo_header.ieee_802_11 = hdr_info.ieee_802_11;
|
|
if (airopeek9->has_fcs)
|
|
wth->pseudo_header.ieee_802_11.fcs_len = 4;
|
|
else {
|
|
wth->pseudo_header.ieee_802_11.fcs_len = 0;
|
|
wth->phdr.len -= 4;
|
|
wth->phdr.caplen -= 4;
|
|
}
|
|
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?
|
|
*/
|
|
wth->pseudo_header.eth.fcs_len = 0;
|
|
wth->phdr.len -= 4;
|
|
wth->phdr.caplen -= 4;
|
|
break;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
airopeekv9_seek_read(wtap *wth, gint64 seek_off,
|
|
union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
|
|
int *err, gchar **err_info)
|
|
{
|
|
airopeek9_t *airopeek9 = (airopeek9_t *)wth->priv;
|
|
hdr_info_t hdr_info;
|
|
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
return FALSE;
|
|
|
|
/* Process the packet header. */
|
|
if (airopeekv9_process_header(wth->random_fh, &hdr_info, err, err_info) == -1)
|
|
return FALSE;
|
|
|
|
switch (wth->file_encap) {
|
|
|
|
case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
|
|
pseudo_header->ieee_802_11 = hdr_info.ieee_802_11;
|
|
if (airopeek9->has_fcs)
|
|
pseudo_header->ieee_802_11.fcs_len = 4;
|
|
else
|
|
pseudo_header->ieee_802_11.fcs_len = 0;
|
|
break;
|
|
|
|
case WTAP_ENCAP_ETHERNET:
|
|
pseudo_header->eth.fcs_len = 0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* XXX - should "errno" be set in "wtap_file_read_expected_bytes()"?
|
|
*/
|
|
errno = WTAP_ERR_CANT_READ;
|
|
wtap_file_read_expected_bytes(pd, length, wth->random_fh, err, err_info);
|
|
return TRUE;
|
|
}
|