forked from osmocom/wireshark
751 lines
22 KiB
C
751 lines
22 KiB
C
/* ngsniffer.c
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*
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* $Id: ngsniffer.c,v 1.12 1999/03/01 18:57:06 gram Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@verdict.uthscsa.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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*/
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/* The code in ngsniffer.c that decodes the time fields for each packet in the
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* Sniffer trace originally came from code from TCPVIEW:
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*
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* TCPVIEW
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*
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* Author: Martin Hunt
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* Networks and Distributed Computing
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* Computing & Communications
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* University of Washington
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* Administration Building, AG-44
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* Seattle, WA 98195
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* Internet: martinh@cac.washington.edu
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*
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*
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* Copyright 1992 by the University of Washington
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted, provided
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* that the above copyright notice appears in all copies and that both the
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* above copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the University of Washington not be
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* used in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. This software is made
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* available "as is", and
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* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
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* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
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* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
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* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include <stdlib.h>
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#include <time.h>
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#include "wtap.h"
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#include "buffer.h"
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#include "ngsniffer.h"
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/*
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* Sniffer record types.
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*/
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#define REC_VERS 1 /* Version record (f_vers) */
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#define REC_FRAME2 4 /* Frame data (f_frame2) */
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#define REC_FRAME4 8 /* Frame data (f_frame4) */
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#define REC_EOF 3 /* End-of-file record (no data follows) */
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/*
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* Sniffer version record format.
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*
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* XXX - the Sniffer documentation doesn't say what the compression stuff
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* means. The manual says "IMPORTANT: You must save the file uncompressed
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* to use this format specification."
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*/
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struct vers_rec {
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gint16 maj_vers; /* major version number */
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gint16 min_vers; /* minor version number */
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gint16 time; /* DOS-format time */
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gint16 date; /* DOS-format date */
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gint8 type; /* what type of records follow */
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gint8 network; /* network type */
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gint8 format; /* format version (we only support version 1!) */
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guint8 timeunit; /* timestamp units */
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gint8 cmprs_vers; /* compression version */
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gint8 cmprs_level; /* compression level */
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gint16 rsvd[2]; /* reserved */
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};
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/*
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* Sniffer type 2 data record format - followed by frame data.
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*/
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struct frame2_rec {
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guint16 time_low; /* low part of time stamp */
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guint16 time_med; /* middle part of time stamp */
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guint16 time_high; /* high part of time stamp */
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gint16 size; /* number of bytes of data */
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guint8 fs; /* frame error status bits */
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guint8 flags; /* buffer flags */
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gint16 true_size; /* size of original frame, in bytes */
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gint16 rsvd; /* reserved */
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};
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/*
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* Sniffer type 4 data record format - followed by frame data.
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*
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* XXX - the manual says that the "flags" field holds "buffer flags;
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* BF_xxxx", but doesn't say what the BF_xxxx flags are.
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*
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* XXX - the manual also says there's an 8-byte "ATMTimeStamp" driver
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* time stamp at the end of "ATMSaveInfo", but, from an ATM Sniffer capture
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* file I've looked at, that appears not to be the case.
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*/
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/*
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* Fields from the AAL5 trailer for the frame, if it's an AAL5 frame
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* rather than a cell.
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*/
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typedef struct _ATM_AAL5Trailer {
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guint16 aal5t_u2u; /* user-to-user indicator */
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guint16 aal5t_len; /* length of the packet */
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guint32 aal5t_chksum; /* checksum for AAL5 packet */
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} ATM_AAL5Trailer;
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typedef struct _ATMTimeStamp {
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guint32 msw; /* most significant word */
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guint32 lsw; /* least significant word */
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} ATMTimeStamp;
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typedef struct _ATMSaveInfo {
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guint32 StatusWord; /* status word from driver */
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ATM_AAL5Trailer Trailer; /* AAL5 trailer */
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guint8 AppTrafType; /* traffic type */
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guint8 AppHLType; /* protocol type */
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guint16 AppReserved; /* reserved */
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guint16 Vpi; /* virtual path identifier */
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guint16 Vci; /* virtual circuit identifier */
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guint16 channel; /* link: 0 for DCE, 1 for DTE */
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guint16 cells; /* number of cells */
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guint32 AppVal1; /* type-dependent */
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guint32 AppVal2; /* type-dependent */
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} ATMSaveInfo;
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/*
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* Bits in StatusWord.
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*/
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#define SW_ERRMASK 0x0F /* Error mask: */
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#define SW_RX_FIFO_UNDERRUN 0x01 /* Receive FIFO underrun */
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#define SW_RX_FIFO_OVERRUN 0x02 /* Receive FIFO overrun */
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#define SW_RX_PKT_TOO_LONG 0x03 /* Received packet > max size */
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#define SW_CRC_ERROR 0x04 /* CRC error */
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#define SW_USER_ABORTED_RX 0x05 /* User aborted receive */
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#define SW_BUF_LEN_TOO_LONG 0x06 /* buffer len > max buf */
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#define SW_INTERNAL_T1_ERROR 0x07 /* Internal T1 error */
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#define SW_RX_CHANNEL_DEACTIV8 0x08 /* Rx channel deactivate */
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#define SW_ERROR 0x80 /* Error indicator */
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#define SW_CONGESTION 0x40 /* Congestion indicator */
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#define SW_CLP 0x20 /* Cell loss priority indicator */
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#define SW_RAW_CELL 0x100 /* RAW cell indicator */
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#define SW_OAM_CELL 0x200 /* OAM cell indicator */
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/*
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* Bits in AppTrafType.
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*
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* For AAL types other than AAL5, the packet data is presumably for a
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* single cell, not a reassembled frame, as the ATM Sniffer manual says
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* it dosn't reassemble cells other than AAL5 cells.
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*/
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#define ATT_AALTYPE 0x0F /* AAL type: */
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#define ATT_AAL_UNKNOWN 0x00 /* Unknown AAL */
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#define ATT_AAL1 0x01 /* AAL1 */
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#define ATT_AAL3_4 0x02 /* AAL3/4 */
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#define ATT_AAL5 0x03 /* AAL5 */
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#define ATT_AAL_USER 0x04 /* User AAL */
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#define ATT_AAL_SIGNALLING 0x05 /* Signaling AAL */
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#define ATT_OAMCELL 0x06 /* OAM cell */
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#define ATT_HLTYPE 0xF0 /* Higher-layer type: */
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#define ATT_HL_UNKNOWN 0x00 /* unknown */
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#define ATT_HL_LLCMX 0x10 /* LLC multiplexed (probably RFC 1483) */
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#define ATT_HL_VCMX 0x20 /* VC multiplexed (probably RFC 1483) */
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#define ATT_HL_LANE 0x30 /* LAN Emulation */
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#define ATT_HL_ILMI 0x40 /* ILMI */
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#define ATT_HL_FRMR 0x50 /* Frame Relay */
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#define ATT_HL_SPANS 0x60 /* FORE SPANS */
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#define ATT_HL_IPSILON 0x70 /* Ipsilon */
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/*
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* Values for AppHLType; the interpretation depends on the ATT_HLTYPE
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* bits in AppTrafType.
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*/
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#define AHLT_UNKNOWN 0x0
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#define AHLT_VCMX_802_3_FCS 0x1 /* VCMX: 802.3 FCS */
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#define AHLT_LANE_LE_CTRL 0x1 /* LANE: LE Ctrl */
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#define AHLT_IPSILON_FT0 0x1 /* Ipsilon: Flow Type 0 */
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#define AHLT_VCMX_802_4_FCS 0x2 /* VCMX: 802.4 FCS */
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#define AHLT_LANE_802_3 0x2 /* LANE: 802.3 */
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#define AHLT_IPSILON_FT1 0x2 /* Ipsilon: Flow Type 1 */
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#define AHLT_VCMX_802_5_FCS 0x3 /* VCMX: 802.5 FCS */
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#define AHLT_LANE_802_5 0x3 /* LANE: 802.5 */
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#define AHLT_IPSILON_FT2 0x3 /* Ipsilon: Flow Type 2 */
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#define AHLT_VCMX_FDDI_FCS 0x4 /* VCMX: FDDI FCS */
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#define AHLT_LANE_802_3_MC 0x4 /* LANE: 802.3 multicast */
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#define AHLT_VCMX_802_6_FCS 0x5 /* VCMX: 802.6 FCS */
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#define AHLT_LANE_802_5_MC 0x5 /* LANE: 802.5 multicast */
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#define AHLT_VCMX_802_3 0x7 /* VCMX: 802.3 */
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#define AHLT_VCMX_802_4 0x8 /* VCMX: 802.4 */
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#define AHLT_VCMX_802_5 0x9 /* VCMX: 802.5 */
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#define AHLT_VCMX_FDDI 0xa /* VCMX: FDDI */
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#define AHLT_VCMX_802_6 0xb /* VCMX: 802.6 */
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#define AHLT_VCMX_FRAGMENTS 0xc /* VCMX: Fragments */
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#define AHLT_VCMX_BPDU 0xe /* VCMX: BPDU */
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struct frame4_rec {
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guint16 time_low; /* low part of time stamp */
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guint16 time_med; /* middle part of time stamp */
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gint8 time_high; /* high part of time stamp */
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gint8 time_day; /* time in days since start of capture */
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gint16 size; /* number of bytes of data */
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gint8 fs; /* frame error status bits */
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gint8 flags; /* buffer flags */
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gint16 true_size; /* size of original frame, in bytes */
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gint16 rsvd3; /* reserved */
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gint16 atm_pad; /* pad to 4-byte boundary */
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ATMSaveInfo atm_info; /* ATM-specific stuff */
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};
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/*
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* Size of ATM LANE header - we have to strip it off as our caller expects
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* a MAC header at the beginning of the frame data.
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*/
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#define ATM_LANE_HEADER_LEN 2
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/* values for V.timeunit */
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#define NUM_NGSNIFF_TIMEUNITS 7
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static double Usec[] = { 15.0, 0.838096, 15.0, 0.5, 2.0, 0.0, 0.1 };
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#define NGSNIFF_ENCAP_ATM 10
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#define NUM_NGSNIFF_ENCAPS 11
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static int sniffer_encap[] = {
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WTAP_ENCAP_TR,
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WTAP_ENCAP_ETHERNET,
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WTAP_ENCAP_ARCNET,
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WTAP_ENCAP_NONE, /* StarLAN */
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WTAP_ENCAP_NONE, /* PC Network broadband */
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WTAP_ENCAP_NONE, /* LocalTalk */
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WTAP_ENCAP_NONE, /* Znet */
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WTAP_ENCAP_NONE, /* Internetwork analyzer */
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WTAP_ENCAP_NONE, /* type 8 not defined in Sniffer */
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WTAP_ENCAP_FDDI,
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WTAP_ENCAP_NONE /* ATM */
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};
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static int get_atm_linktype(wtap *wth);
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static int linktype_for_packet(u_int app_traf_type, u_int app_hl_type);
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/* Returns WTAP_FILE_NGSNIFFER on success, WTAP_FILE_UNKNOWN on failure */
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int ngsniffer_open(wtap *wth)
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{
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int bytes_read;
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char magic[18];
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char record_type[2];
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char record_length[4]; /* only the first 2 bytes are length,
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the last 2 are "reserved" and are thrown away */
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guint16 type, length = 0;
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struct vers_rec version;
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guint16 start_date;
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guint16 start_time;
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struct tm tm;
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/* Read in the string that should be at the start of a Sniffer file */
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fseek(wth->fh, 0, SEEK_SET);
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bytes_read = fread(magic, 1, 17, wth->fh);
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if (bytes_read != 17) {
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return WTAP_FILE_UNKNOWN;
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}
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magic[17] = 0;
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if (strcmp(magic, "TRSNIFF data \x1a")) {
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return WTAP_FILE_UNKNOWN;
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}
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/* This is a ngsniffer file */
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wth->capture.ngsniffer = g_malloc(sizeof(ngsniffer_t));
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wth->subtype_read = ngsniffer_read;
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wth->snapshot_length = 16384; /* not available in header, only in frame */
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/*
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* Read the first record, which the manual says is a version
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* record.
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*/
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bytes_read = fread(record_type, 1, 2, wth->fh);
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bytes_read += fread(record_length, 1, 4, wth->fh);
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if (bytes_read != 6) {
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free(wth->capture.ngsniffer);
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return WTAP_FILE_UNKNOWN;
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}
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type = pletohs(record_type);
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length = pletohs(record_length);
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if (type != REC_VERS) {
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g_message("ngsniffer: Sniffer file doesn't start with a version record");
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free(wth->capture.ngsniffer);
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return WTAP_FILE_UNKNOWN;
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}
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fread(&version, 1, sizeof version, wth->fh);
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/* Make sure this is an uncompressed Sniffer file */
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if (version.format != 1) {
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g_message("ngsniffer: Compressed Sniffer files are not supported");
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free(wth->capture.ngsniffer);
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return WTAP_FILE_UNKNOWN;
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}
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/* Get data link type */
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if (version.network >= NUM_NGSNIFF_ENCAPS) {
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g_message("ngsniffer: network type %d unknown", version.network);
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free(wth->capture.ngsniffer);
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return WTAP_FILE_UNKNOWN;
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}
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else {
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wth->file_encap = sniffer_encap[version.network];
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}
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/* Get time unit */
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if (version.timeunit >= NUM_NGSNIFF_TIMEUNITS) {
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g_message("ngsniffer: Unknown timeunit %d", version.timeunit);
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free(wth->capture.ngsniffer);
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return WTAP_FILE_UNKNOWN;
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}
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else {
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wth->capture.ngsniffer->timeunit = Usec[version.timeunit];
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}
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/* Get capture start time */
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start_time = pletohs(&version.time);
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start_date = pletohs(&version.date);
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tm.tm_year = ((start_date&0xfe00)>>9) + 1980 - 1900;
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tm.tm_mon = ((start_date&0x1e0)>>5) - 1;
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tm.tm_mday = (start_date&0x1f);
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/* The time does not appear to act as an offset; only the date
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tm.tm_hour = (start_time&0xf800)>>11;
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tm.tm_min = (start_time&0x7e0)>>5;
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tm.tm_sec = (start_time&0x1f)<<1;*/
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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wth->capture.ngsniffer->start = mktime(&tm);
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/*
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* XXX - what if "secs" is -1? Unlikely,
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* but if the capture was done in a time
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* zone that switches between standard and
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* summer time sometime other than when we
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* do, and thus the time was one that doesn't
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* exist here because a switch from standard
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* to summer time zips over it, it could
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* happen.
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*
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* On the other hand, if the capture was done
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* in a different time zone, this won't work
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* right anyway; unfortunately, the time zone
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* isn't stored in the capture file.
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*/
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/*
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* Unless this is an ATM capture file, we won't have to read
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* any data records to figure out the network type; zero out
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* "pkt_len" to indicate that we've not read the first packet's
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* header.
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*/
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wth->capture.ngsniffer->pkt_len = 0;
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wth->capture.ngsniffer->is_atm = 0;
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if (version.network == NGSNIFF_ENCAP_ATM) {
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/*
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* Gak. There's no link-layer header; however, the
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* frame is probably the data that AAL5 handed up,
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* which contains RFC 1483 stuff or LANE stuff or SPANS
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* stuff or whatever, or, if the "frame" is just an
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* ATM cell, it's probably just the cell.
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*
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* I.e., there *is* no appropriate "link type".
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*
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* So what we do is scan forward, looking for the first
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* LANE or RFC 1483 LLC-multiplexed frame, use that to
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* determine the link type, and arrange to discard all
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* frames other than those of that type. That denies
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* "libpcap" applications access to anything other
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* than that, but I *suspect* you don't get a mix of
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* RFC 1483 LLC-multiplexed and LANE traffic, and
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* the applications probably would have no idea how
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* to cope with raw cells or other types of frames
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* anyway; the only place you lose is with FORE
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* SPANS.
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*/
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wth->file_encap = get_atm_linktype(wth);
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if (wth->file_encap == -1) {
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/*
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* Oops, we couldn't find a link type we can
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* handle.
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*/
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g_message("ngsniffer: no LANE or RFC 1483 LLC-multiplexed frames found");
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free(wth->capture.ngsniffer);
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return WTAP_FILE_UNKNOWN;
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}
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wth->capture.ngsniffer->is_atm = 1;
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}
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return WTAP_FILE_NGSNIFFER;
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}
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static int get_atm_linktype(wtap *wth)
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{
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int bytes_read;
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char record_type[2];
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char record_length[4]; /* only 1st 2 bytes are length */
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guint16 type, length;
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struct frame4_rec frame4;
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int linktype;
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guint16 time_low, time_med, time_high, true_size, size;
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for (;;) {
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/*
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* Read the record header.
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*/
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bytes_read = fread(record_type, 1, 2, wth->fh);
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bytes_read += fread(record_length, 1, 4, wth->fh);
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if (bytes_read != 6) {
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/*
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* End of file or error. Probably means there *are*
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* no LANE or RFC 1483 LLC-multiplexed frames,
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* which means we can't handle this in
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* "wiretap". Return an error.
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*/
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return -1;
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}
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type = pletohs(record_type);
|
|
length = pletohs(record_length);
|
|
|
|
if (type == REC_EOF) {
|
|
/*
|
|
* End of file. Probably means there *are*
|
|
* no LANE or RFC 1483 LLC-multiplexed frames,
|
|
* which means we can't handle this in
|
|
* "wiretap". Return an error.
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
switch (type) {
|
|
|
|
case REC_FRAME2:
|
|
/*
|
|
* Umm, we're not supposed to get these in an
|
|
* ATM Sniffer file; return an error.
|
|
*/
|
|
return -1;
|
|
|
|
case REC_FRAME4:
|
|
/* Read the f_frame4_struct */
|
|
bytes_read = fread(&frame4, 1, sizeof frame4, wth->fh);
|
|
if (bytes_read != sizeof frame4) {
|
|
/*
|
|
* Read error or short record. Return
|
|
* an error.
|
|
*/
|
|
return -1;
|
|
}
|
|
time_low = pletohs(&frame4.time_low);
|
|
time_med = pletohs(&frame4.time_med);
|
|
time_high = frame4.time_high;
|
|
size = pletohs(&frame4.size);
|
|
true_size = pletohs(&frame4.true_size);
|
|
|
|
length -= sizeof frame4; /* we already read that much */
|
|
|
|
/*
|
|
* Skip it if it's not an AAL5 frame.
|
|
*/
|
|
if ((frame4.atm_info.AppTrafType & ATT_AALTYPE)
|
|
!= ATT_AAL5)
|
|
break;
|
|
|
|
/*
|
|
* OK, can we determine a network type from it?
|
|
*/
|
|
linktype = linktype_for_packet(
|
|
frame4.atm_info.AppTrafType,
|
|
frame4.atm_info.AppHLType);
|
|
if (linktype == -1) {
|
|
/*
|
|
* Nope - keep looking.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* XXX - use the "time_day" field? Is that for captures
|
|
* that take a *really* long time?
|
|
*/
|
|
wth->capture.ngsniffer->t = (double)time_low+(double)(time_med)*65536.0 +
|
|
(double)time_high*4294967296.0;
|
|
|
|
wth->capture.ngsniffer->true_size = true_size;
|
|
wth->capture.ngsniffer->size = size;
|
|
goto found;
|
|
|
|
default:
|
|
break; /* unknown type, skip it */
|
|
}
|
|
|
|
/*
|
|
* Well, we don't know what it is, or we know what
|
|
* it is but can't handle it. Skip past the data
|
|
* portion, and keep looping.
|
|
*/
|
|
fseek(wth->fh, length, SEEK_CUR);
|
|
}
|
|
|
|
found:
|
|
/*
|
|
* Note that we've already read the header, so that we don't do
|
|
* it in "ngsniffer_read()"; we've saved the stuff we need
|
|
* from the header, so we use it instead - and we save the
|
|
* length of the record, so we know how much to read.
|
|
*/
|
|
wth->capture.ngsniffer->pkt_len = length;
|
|
return (linktype);
|
|
}
|
|
|
|
static int linktype_for_packet(u_int app_traf_type, u_int app_hl_type)
|
|
{
|
|
switch (app_traf_type & ATT_HLTYPE) {
|
|
|
|
case ATT_HL_LLCMX:
|
|
return (WTAP_ENCAP_ATM_RFC1483);
|
|
|
|
case ATT_HL_LANE:
|
|
/*
|
|
* OK, is it 802.3, 802.5, or "none of the above"?
|
|
*/
|
|
switch (app_hl_type) {
|
|
|
|
case AHLT_LANE_802_3:
|
|
case AHLT_LANE_802_3_MC:
|
|
return (WTAP_ENCAP_ETHERNET);
|
|
|
|
case AHLT_LANE_802_5:
|
|
case AHLT_LANE_802_5_MC:
|
|
return (WTAP_ENCAP_TR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Keep looking until we find one of the above or run out of
|
|
* capture file.
|
|
*/
|
|
return (-1);
|
|
}
|
|
|
|
/* Read the next packet */
|
|
int ngsniffer_read(wtap *wth)
|
|
{
|
|
int packet_size = wth->capture.ngsniffer->pkt_len;
|
|
int bytes_read;
|
|
char record_type[2];
|
|
char record_length[4]; /* only 1st 2 bytes are length */
|
|
guint16 type, length;
|
|
struct frame2_rec frame2;
|
|
struct frame4_rec frame4;
|
|
int linktype;
|
|
double t;
|
|
guint16 time_low, time_med, time_high, true_size, size;
|
|
int data_offset;
|
|
|
|
/*
|
|
* If we've already read the first packet's header, get the
|
|
* information we saved from it, and skip ahead and read
|
|
* the data.
|
|
*/
|
|
if (wth->capture.ngsniffer->pkt_len != 0) {
|
|
length = wth->capture.ngsniffer->pkt_len;
|
|
true_size = wth->capture.ngsniffer->true_size;
|
|
size = wth->capture.ngsniffer->size;
|
|
t = wth->capture.ngsniffer->t;
|
|
wth->capture.ngsniffer->pkt_len = 0; /* won't have read header for next packet */
|
|
goto found;
|
|
}
|
|
|
|
for (;;) {
|
|
/*
|
|
* Read the record header.
|
|
*/
|
|
bytes_read = fread(record_type, 1, 2, wth->fh);
|
|
bytes_read += fread(record_length, 1, 4, wth->fh);
|
|
if (bytes_read != 6) {
|
|
/*
|
|
* End of file or error.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
type = pletohs(record_type);
|
|
length = pletohs(record_length);
|
|
|
|
switch (type) {
|
|
|
|
case REC_FRAME2:
|
|
/* Read the f_frame2_struct */
|
|
bytes_read = fread(&frame2, 1, sizeof frame2, wth->fh);
|
|
if (bytes_read != sizeof frame2) {
|
|
/*
|
|
* Read error or short record. Return
|
|
* an error.
|
|
*/
|
|
g_message("ngsniffer_read: not enough frame2 data (%d bytes)",
|
|
bytes_read);
|
|
return 0;
|
|
}
|
|
time_low = pletohs(&frame2.time_low);
|
|
time_med = pletohs(&frame2.time_med);
|
|
time_high = pletohs(&frame2.time_high);
|
|
size = pletohs(&frame2.size);
|
|
true_size = pletohs(&frame2.true_size);
|
|
|
|
length -= sizeof frame2; /* we already read that much */
|
|
|
|
t = (double)time_low+(double)(time_med)*65536.0 +
|
|
(double)time_high*4294967296.0;
|
|
|
|
goto found;
|
|
|
|
case REC_FRAME4:
|
|
/* Read the f_frame4_struct */
|
|
bytes_read = fread(&frame4, 1, sizeof frame4, wth->fh);
|
|
if (bytes_read != sizeof frame4) {
|
|
/*
|
|
* Read error or short record. Return
|
|
* an error.
|
|
*/
|
|
g_message("ngsniffer_read: not enough frame4 data (%d bytes)",
|
|
bytes_read);
|
|
return 0;
|
|
}
|
|
time_low = pletohs(&frame4.time_low);
|
|
time_med = pletohs(&frame4.time_med);
|
|
time_high = frame4.time_high;
|
|
size = pletohs(&frame4.size);
|
|
true_size = pletohs(&frame4.true_size);
|
|
|
|
length -= sizeof frame4; /* we already read that much */
|
|
|
|
/*
|
|
* Skip it if it's not an AAL5 frame.
|
|
*/
|
|
if ((frame4.atm_info.AppTrafType & ATT_AALTYPE)
|
|
!= ATT_AAL5)
|
|
break;
|
|
|
|
/*
|
|
* Skip it if it's not a frame of the type we're
|
|
* handling.
|
|
*/
|
|
linktype = linktype_for_packet(
|
|
frame4.atm_info.AppTrafType,
|
|
frame4.atm_info.AppHLType);
|
|
if (wth->file_encap != linktype)
|
|
break;
|
|
|
|
/*
|
|
* XXX - use the "time_day" field? Is that for captures
|
|
* that take a *really* long time?
|
|
*/
|
|
t = (double)time_low+(double)(time_med)*65536.0 +
|
|
(double)time_high*4294967296.0;
|
|
|
|
goto found;
|
|
|
|
case REC_EOF:
|
|
/*
|
|
* End of file. Return an EOF indication.
|
|
*/
|
|
return 0;
|
|
|
|
default:
|
|
break; /* unknown type, skip it */
|
|
}
|
|
|
|
/*
|
|
* Well, we don't know what it is, or we know what
|
|
* it is but can't handle it. Skip past the data
|
|
* portion, and keep looping.
|
|
*/
|
|
fseek(wth->fh, length, SEEK_CUR);
|
|
}
|
|
|
|
found:
|
|
wth->phdr.len = true_size ? true_size : size;
|
|
wth->phdr.caplen = size;
|
|
|
|
/*
|
|
* For ATM LANE, skip the 2-byte LAN Emulation header. That
|
|
* leaves an Ethernet/802.3 header for Ethernet/802.3, and
|
|
* leaves a pad byte and an 802.5 frame control byte for 802.5.
|
|
*/
|
|
if (wth->capture.ngsniffer->is_atm && wth->file_encap != WTAP_ENCAP_ATM_RFC1483) {
|
|
if (length <= ATM_LANE_HEADER_LEN)
|
|
return -1;
|
|
fseek(wth->fh, ATM_LANE_HEADER_LEN, SEEK_CUR);
|
|
wth->phdr.caplen -= ATM_LANE_HEADER_LEN;
|
|
wth->phdr.len -= ATM_LANE_HEADER_LEN;
|
|
length -= ATM_LANE_HEADER_LEN;
|
|
}
|
|
|
|
/*
|
|
* Read the packet data.
|
|
*/
|
|
buffer_assure_space(wth->frame_buffer, length);
|
|
data_offset = ftell(wth->fh);
|
|
bytes_read = fread(buffer_start_ptr(wth->frame_buffer), 1,
|
|
length, wth->fh);
|
|
|
|
if (bytes_read != length) {
|
|
if (ferror(wth->fh)) {
|
|
g_message("ngsniffer_read: fread for data: read error\n");
|
|
} else {
|
|
g_message("ngsniffer_read: fread for data: %d bytes out of %d",
|
|
bytes_read, packet_size);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
t = t/1000000.0 * wth->capture.ngsniffer->timeunit; /* t = # of secs */
|
|
t += wth->capture.ngsniffer->start;
|
|
wth->phdr.ts.tv_sec = (long)t;
|
|
wth->phdr.ts.tv_usec = (unsigned long)((t-(double)(wth->phdr.ts.tv_sec))
|
|
*1.0e6);
|
|
wth->phdr.pkt_encap = wth->file_encap;
|
|
return data_offset;
|
|
}
|