![Guy Harris](/assets/img/avatar_default.png)
0 means "there is no FCS in the packet data", 4 means "there is an FCS in the packet data", -1 means "I don't know whether there's an FCS in the packet data, guess based on the packet size". Assume that Ethernet encapsulated inside other protocols has no FCS, by having the "eth" dissector assume that (and not check for an Ethernet pseudo-header). Have "ethertype()" take an argument giving the FCS size; pass 0 when appropriate. Fix up Wiretap routines to set the pseudo-header. This means we no longer use the "generic" seek-and-read routine, so get rid of it. svn path=/trunk/; revision=8574
495 lines
15 KiB
C
495 lines
15 KiB
C
/* 5views.c
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*
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* $Id: 5views.c,v 1.3 2003/10/01 07:11:46 guy Exp $
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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 <time.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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typedef struct
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{
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guint32 Signature;
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guint32 Size; /* Total size of Header in bytes (included Signature) */
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guint32 Version; /* Identify version and so the format of this record */
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guint32 DataSize; /* Total size of data included in the Info Record (except the header size) */
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guint32 FileType; /* Type of the file */
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guint32 Reserved[3]; /* Reserved for future use */
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}t_5VW_Info_Header;
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typedef struct
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{
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guint32 Type; /* Id of the attribute */
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guint16 Size; /* Size of the data part of the attribute (not including header size) */
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guint16 Nb; /* Number of elements */
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}t_5VW_Attributes_Header;
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#define CST_5VW_INFO_HEADER_KEY 0xAAAAAAAA /* signature */
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#define CST_5VW_INFO_RECORD_VERSION 0x00010000 /* version */
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#define CST_5VW_DECALE_FILE_TYPE 24
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#define CST_5VW_SECTION_CAPTURES 0x08
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#define CST_5VW_CAPTURES_FILE (CST_5VW_SECTION_CAPTURES << CST_5VW_DECALE_FILE_TYPE) /* 0x08000000 */
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#define CST_5VW_FLAT_FILE 0x10000000
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#define CST_5VW_CAPTURE_FILEID (CST_5VW_FLAT_FILE | CST_5VW_CAPTURES_FILE)
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#define CST_5VW_FAMILY_CAP_ETH 0x01
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#define CST_5VW_FAMILY_CAP_WAN 0x02
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#define CST_5VW_DECALE_FILE_FAMILY 12
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#define CST_5VW_CAP_ETH (CST_5VW_FAMILY_CAP_ETH << CST_5VW_DECALE_FILE_FAMILY) /* 0x00001000 */
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#define CST_5VW_CAP_WAN (CST_5VW_FAMILY_CAP_WAN << CST_5VW_DECALE_FILE_FAMILY) /* 0x00002000 */
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#define CST_5VW_CAPTURE_ETH_FILEID (CST_5VW_CAPTURE_FILEID | CST_5VW_CAP_ETH)
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#define CST_5VW_CAPTURE_WAN_FILEID (CST_5VW_CAPTURE_FILEID | CST_5VW_CAP_WAN)
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#define CST_5VW_CAPTURE_FILE_TYPE_MASK 0xFF000000
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#define CST_5VW_FRAME_RECORD 0x00000000
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#define CST_5VW_RECORDS_HEADER_KEY 0x3333EEEE
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typedef struct
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{
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t_5VW_Info_Header Info_Header;
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t_5VW_Attributes_Header HeaderDateCreation;
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guint32 Time;
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t_5VW_Attributes_Header HeaderNbFrames;
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guint32 TramesStockeesInFile;
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}t_5VW_Capture_Header;
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typedef struct
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{
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guint32 Key; /* 0x3333EEEE */
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guint16 HeaderSize; /* Actual size of this header in bytes (32) */
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guint16 HeaderType; /* Exact type of this header (0x4000) */
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guint32 RecType; /* Type of record */
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guint32 RecSubType; /* Subtype of record */
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guint32 RecSize; /* Size of one record */
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guint32 RecNb; /* Number of records */
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guint32 Utc;
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guint32 NanoSecondes;
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guint32 RecInfo; /* Info about Alarm / Event / Frame captured */
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}t_5VW_TimeStamped_Header;
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#define CST_5VW_IA_CAP_INF_NB_TRAMES_STOCKEES 0x20000000
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#define CST_5VW_IA_DATE_CREATION 0x80000007 /* Struct t_Attrib_Date_Create */
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#define CST_5VW_TIMESTAMPED_HEADER_TYPE 0x4000
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#define CST_5VW_CAPTURES_RECORD (CST_5VW_SECTION_CAPTURES << 28) /* 0x80000000 */
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#define CST_5VW_SYSTEM_RECORD 0x00000000
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static gboolean _5views_read(wtap *wth, int *err, long *data_offset);
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static gboolean _5views_read_rec_data(FILE_T fh, guchar *pd, int length,int *err);
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static int _5views_read_header(wtap *wth, FILE_T fh, t_5VW_TimeStamped_Header *hdr, int *err);
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static gboolean _5views_seek_read(wtap *wth, long seek_off, union wtap_pseudo_header *pseudo_header, guchar *pd, int length, int *err);
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static gboolean _5views_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
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const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err);
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static gboolean _5views_dump_close(wtap_dumper *wdh, int *err);
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int _5views_open(wtap *wth, int *err)
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{
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int bytes_read;
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t_5VW_Capture_Header Capture_Header;
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int encap = WTAP_ENCAP_UNKNOWN;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&Capture_Header.Info_Header, 1, sizeof(t_5VW_Info_Header), wth->fh);
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if (bytes_read != sizeof(t_5VW_Info_Header)) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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return 0;
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}
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wth->data_offset+=bytes_read;
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/* Check whether that's 5Views format or not */
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if(Capture_Header.Info_Header.Signature != CST_5VW_INFO_HEADER_KEY)
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{
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return 0;
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}
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/* Check Version */
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Capture_Header.Info_Header.Version =
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pletohl(&Capture_Header.Info_Header.Version);
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switch (Capture_Header.Info_Header.Version) {
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case CST_5VW_INFO_RECORD_VERSION:
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break;
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default:
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g_message("5views: header version %u unsupported", Capture_Header.Info_Header.Version);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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/* Check File Type */
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Capture_Header.Info_Header.FileType =
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pletohl(&Capture_Header.Info_Header.FileType);
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if((Capture_Header.Info_Header.FileType & CST_5VW_CAPTURE_FILE_TYPE_MASK) != CST_5VW_CAPTURE_FILEID)
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{
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g_message("5views: file is not a capture file (filetype is %u)", Capture_Header.Info_Header.Version);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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/* Check possible Encap */
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switch (Capture_Header.Info_Header.FileType) {
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case CST_5VW_CAPTURE_ETH_FILEID:
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encap = WTAP_ENCAP_ETHERNET;
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break;
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/* case CST_5VW_CAPTURE_WAN_FILEID:
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break;
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*/
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default:
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g_message("5views: network type %u unknown or unsupported",
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Capture_Header.Info_Header.FileType);
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*err = WTAP_ERR_UNSUPPORTED_ENCAP;
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return -1;
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}
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/* read the remaining header information */
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bytes_read = file_read(&Capture_Header.HeaderDateCreation, 1, sizeof (t_5VW_Capture_Header) - sizeof(t_5VW_Info_Header), wth->fh);
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if (bytes_read != sizeof (t_5VW_Capture_Header)- sizeof(t_5VW_Info_Header) ) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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return 0;
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}
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wth->data_offset+=bytes_read;
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/* This is a 5views capture file */
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wth->file_type = WTAP_FILE_5VIEWS;
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wth->subtype_read = _5views_read;
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wth->subtype_seek_read = _5views_seek_read;
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wth->file_encap = encap;
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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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/* Read the next packet */
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static gboolean
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_5views_read(wtap *wth, int *err, long *data_offset)
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{
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t_5VW_TimeStamped_Header TimeStamped_Header;
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int bytes_read;
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guint packet_size;
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guint orig_size;
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do
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{
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bytes_read = _5views_read_header(wth, wth->fh, &TimeStamped_Header, err);
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if (bytes_read == -1) {
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/*
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* We failed to read the header.
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*/
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return FALSE;
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}
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wth->data_offset += bytes_read;
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TimeStamped_Header.Key = pletohl(&TimeStamped_Header.Key);
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if(TimeStamped_Header.Key != CST_5VW_RECORDS_HEADER_KEY)
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return FALSE;
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TimeStamped_Header.RecSubType =
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pletohl(&TimeStamped_Header.RecSubType);
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TimeStamped_Header.RecSize =
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pletohl(&TimeStamped_Header.RecSize);
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if(TimeStamped_Header.RecSubType != CST_5VW_FRAME_RECORD) {
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if (file_seek(wth->fh, TimeStamped_Header.RecSize, SEEK_SET, err) == -1)
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return FALSE;
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wth->data_offset += TimeStamped_Header.RecSize;
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} else
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break;
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} while (1);
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packet_size = TimeStamped_Header.RecSize;
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orig_size = TimeStamped_Header.RecSize;
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*data_offset = wth->data_offset;
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buffer_assure_space(wth->frame_buffer, packet_size);
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if (!_5views_read_rec_data(wth->fh, buffer_start_ptr(wth->frame_buffer),
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packet_size, err))
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return FALSE; /* Read error */
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wth->data_offset += packet_size;
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TimeStamped_Header.Utc = pletohl(&TimeStamped_Header.Utc);
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TimeStamped_Header.NanoSecondes =
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pletohl(&TimeStamped_Header.NanoSecondes);
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wth->phdr.ts.tv_sec = TimeStamped_Header.Utc;
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wth->phdr.ts.tv_usec = TimeStamped_Header.NanoSecondes/1000;
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wth->phdr.caplen = packet_size;
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wth->phdr.len = orig_size;
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wth->phdr.pkt_encap = wth->file_encap;
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switch (wth->file_encap) {
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case WTAP_ENCAP_ETHERNET:
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/* We assume there's no FCS in this frame. */
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wth->pseudo_header.eth.fcs_len = 0;
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break;
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}
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return TRUE;
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}
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static gboolean
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_5views_read_rec_data(FILE_T fh, guchar *pd, int length, int *err)
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{
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int bytes_read;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(pd, 1, length, fh);
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if (bytes_read != length) {
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*err = file_error(fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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return TRUE;
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}
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/* Read the header of the next packet; if "silent" is TRUE, don't complain
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to the console, as we're testing to see if the file appears to be of a
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particular type.
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Return -1 on an error, or the number of bytes of header read on success. */
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static int
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_5views_read_header(wtap *wth _U_, FILE_T fh, t_5VW_TimeStamped_Header *hdr, int *err)
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{
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int bytes_read, bytes_to_read;
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bytes_to_read = sizeof(t_5VW_TimeStamped_Header);
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/* Read record header. */
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bytes_read = file_read(hdr, 1, bytes_to_read, fh);
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if (bytes_read != bytes_to_read) {
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*err = file_error(fh);
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if (*err == 0 && bytes_read != 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return -1;
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}
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return bytes_read;
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}
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static gboolean
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_5views_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd, int length, int *err)
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{
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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/*
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* Read the packet data.
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*/
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if (!_5views_read_rec_data(wth->random_fh, pd, length, err))
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return FALSE;
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switch (wth->file_encap) {
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case WTAP_ENCAP_ETHERNET:
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/* We assume there's no FCS in this frame. */
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pseudo_header->eth.fcs_len = 0;
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break;
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}
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return TRUE;
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}
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static const int wtap_encap[] = {
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-1, /* WTAP_ENCAP_UNKNOWN -> unsupported */
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CST_5VW_CAPTURE_ETH_FILEID, /* WTAP_ENCAP_ETHERNET -> Ehernet Ethernet */
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-1, /* WTAP_ENCAP_TOKEN_RING -> unsupported */
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-1, /* WTAP_ENCAP_SLIP -> unsupported */
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-1, /* WTAP_ENCAP_PPP -> unsupported */
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-1, /* WTAP_ENCAP_FDDI -> unsupported */
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-1, /* WTAP_ENCAP_FDDI_BITSWAPPED -> unsupported */
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-1, /* WTAP_ENCAP_RAW_IP -> unsupported */
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-1, /* WTAP_ENCAP_ARCNET -> unsupported */
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-1, /* WTAP_ENCAP_ATM_RFC1483 -> unsupported */
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-1, /* WTAP_ENCAP_LINUX_ATM_CLIP -> unsupported */
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-1, /* WTAP_ENCAP_LAPB -> unsupported */
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-1, /* WTAP_ENCAP_ATM_PDUS -> unsupported */
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-1 /* WTAP_ENCAP_NULL -> unsupported */
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};
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#define NUM_WTAP_ENCAPS (sizeof wtap_encap / sizeof wtap_encap[0])
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/* Returns 0 if we could write the specified encapsulation type,
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an error indication otherwise. */
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int _5views_dump_can_write_encap(int encap)
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{
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/* Per-packet encapsulations aren't supported. */
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if (encap == WTAP_ENCAP_PER_PACKET)
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return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;
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if (encap < 0 || (unsigned) encap >= NUM_WTAP_ENCAPS || wtap_encap[encap] == -1)
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return WTAP_ERR_UNSUPPORTED_ENCAP;
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return 0;
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}
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/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
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failure */
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gboolean _5views_dump_open(wtap_dumper *wdh, gboolean cant_seek _U_, int *err)
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{
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/* We can't fill in all the fields in the file header, as we
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haven't yet written any packets. As we'll have to rewrite
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the header when we've written out all the packets, we just
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skip over the header for now. */
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if (fseek(wdh->fh, sizeof(t_5VW_Capture_Header), SEEK_SET) == -1) {
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*err = errno;
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return FALSE;
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}
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/* This is a 5Views file */
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wdh->subtype_write = _5views_dump;
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wdh->subtype_close = _5views_dump_close;
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wdh->dump._5views = g_malloc(sizeof(_5views_dump_t));
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return TRUE;
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}
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/* Write a record for a packet to a dump file.
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Returns TRUE on success, FALSE on failure. */
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static gboolean _5views_dump(wtap_dumper *wdh,
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const struct wtap_pkthdr *phdr,
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const union wtap_pseudo_header *pseudo_header _U_,
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const guchar *pd, int *err)
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{
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size_t nwritten;
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static t_5VW_TimeStamped_Header HeaderFrame;
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/* Frame Header */
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/* constant fields */
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HeaderFrame.Key = htolel(CST_5VW_RECORDS_HEADER_KEY);
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HeaderFrame.HeaderSize = htoles(sizeof(t_5VW_TimeStamped_Header));
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HeaderFrame.HeaderType = htoles(CST_5VW_TIMESTAMPED_HEADER_TYPE);
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HeaderFrame.RecType = htolel(CST_5VW_CAPTURES_RECORD | CST_5VW_SYSTEM_RECORD);
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HeaderFrame.RecSubType = htolel(CST_5VW_FRAME_RECORD);
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HeaderFrame.RecNb = htolel(1);
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/* record-dependant fields */
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HeaderFrame.Utc = htolel(phdr->ts.tv_sec);
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HeaderFrame.NanoSecondes = htolel(phdr->ts.tv_usec*1000);
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HeaderFrame.RecSize = htolel(phdr->len);
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HeaderFrame.RecInfo = htolel(0);
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/* write the record header */
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nwritten = fwrite(&HeaderFrame, 1, sizeof(t_5VW_TimeStamped_Header), wdh->fh);
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if (nwritten != sizeof(t_5VW_TimeStamped_Header)) {
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if (nwritten == 0 && ferror(wdh->fh))
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*err = errno;
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else
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*err = WTAP_ERR_SHORT_WRITE;
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return FALSE;
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}
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/* write the data */
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nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
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if (nwritten != phdr->caplen) {
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if (nwritten == 0 && ferror(wdh->fh))
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*err = errno;
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else
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*err = WTAP_ERR_SHORT_WRITE;
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return FALSE;
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}
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wdh->dump._5views->nframes ++;
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return TRUE;
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}
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static gboolean _5views_dump_close(wtap_dumper *wdh, int *err)
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{
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t_5VW_Capture_Header file_hdr;
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size_t nwritten;
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if (fseek(wdh->fh, 0, SEEK_SET) == -1) {
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*err = errno;
|
|
return FALSE;
|
|
}
|
|
|
|
/* fill in the Info_Header */
|
|
file_hdr.Info_Header.Signature = htolel(CST_5VW_INFO_HEADER_KEY);
|
|
file_hdr.Info_Header.Size = htolel(sizeof(t_5VW_Info_Header)); /* Total size of Header in bytes (included Signature) */
|
|
file_hdr.Info_Header.Version = htolel(CST_5VW_INFO_RECORD_VERSION); /* Identify version and so the format of this record */
|
|
file_hdr.Info_Header.DataSize = htolel(sizeof(t_5VW_Attributes_Header)
|
|
+ sizeof(guint32)
|
|
+ sizeof(t_5VW_Attributes_Header)
|
|
+ sizeof(guint32));
|
|
/* Total size of data included in the Info Record (except the header size) */
|
|
file_hdr.Info_Header.FileType = htolel(wtap_encap[wdh->encap]); /* Type of the file */
|
|
file_hdr.Info_Header.Reserved[0] = 0; /* Reserved for future use */
|
|
file_hdr.Info_Header.Reserved[1] = 0; /* Reserved for future use */
|
|
file_hdr.Info_Header.Reserved[2] = 0; /* Reserved for future use */
|
|
|
|
/* fill in the HeaderDateCreation */
|
|
file_hdr.HeaderDateCreation.Type = htolel(CST_5VW_IA_DATE_CREATION); /* Id of the attribute */
|
|
file_hdr.HeaderDateCreation.Size = htoles(sizeof(guint32)); /* Size of the data part of the attribute (not including header size) */
|
|
file_hdr.HeaderDateCreation.Nb = htoles(1); /* Number of elements */
|
|
|
|
/* fill in the Time field */
|
|
#ifdef _WIN32
|
|
_tzset();
|
|
#endif
|
|
file_hdr.Time = htolel(time(NULL));
|
|
|
|
/* fill in the Time field */
|
|
file_hdr.HeaderNbFrames.Type = htolel(CST_5VW_IA_CAP_INF_NB_TRAMES_STOCKEES); /* Id of the attribute */
|
|
file_hdr.HeaderNbFrames.Size = htoles(sizeof(guint32)); /* Size of the data part of the attribute (not including header size) */
|
|
file_hdr.HeaderNbFrames.Nb = htoles(1); /* Number of elements */
|
|
|
|
/* fill in the number of frames saved */
|
|
file_hdr.TramesStockeesInFile = htolel(wdh->dump._5views->nframes);
|
|
|
|
/* Write the file header. */
|
|
nwritten = fwrite(&file_hdr, 1, sizeof(t_5VW_Capture_Header), wdh->fh);
|
|
if (nwritten != sizeof(t_5VW_Capture_Header)) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|