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wireshark/wiretap/ngsniffer.c

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/* ngsniffer.c
*
* $Id: ngsniffer.c,v 1.19 1999/08/22 02:29:39 guy Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@verdict.uthscsa.edu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/* The code in ngsniffer.c that decodes the time fields for each packet in the
* Sniffer trace originally came from code from TCPVIEW:
*
* TCPVIEW
*
* Author: Martin Hunt
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: martinh@cac.washington.edu
*
*
* Copyright 1992 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include "wtap.h"
#include "buffer.h"
#include "ngsniffer.h"
/*
* Sniffer record types.
*/
#define REC_VERS 1 /* Version record (f_vers) */
#define REC_FRAME2 4 /* Frame data (f_frame2) */
#define REC_FRAME4 8 /* Frame data (f_frame4) */
#define REC_EOF 3 /* End-of-file record (no data follows) */
/*
* Sniffer version record format.
*
* XXX - the Sniffer documentation doesn't say what the compression stuff
* means. The manual says "IMPORTANT: You must save the file uncompressed
* to use this format specification."
*/
struct vers_rec {
gint16 maj_vers; /* major version number */
gint16 min_vers; /* minor version number */
gint16 time; /* DOS-format time */
gint16 date; /* DOS-format date */
gint8 type; /* what type of records follow */
guint8 network; /* network type */
gint8 format; /* format version (we only support version 1!) */
guint8 timeunit; /* timestamp units */
gint8 cmprs_vers; /* compression version */
gint8 cmprs_level; /* compression level */
gint16 rsvd[2]; /* reserved */
};
/*
* Sniffer type 2 data record format - followed by frame data.
*/
struct frame2_rec {
guint16 time_low; /* low part of time stamp */
guint16 time_med; /* middle part of time stamp */
guint16 time_high; /* high part of time stamp */
gint16 size; /* number of bytes of data */
guint8 fs; /* frame error status bits */
guint8 flags; /* buffer flags */
gint16 true_size; /* size of original frame, in bytes */
gint16 rsvd; /* reserved */
};
/*
* Sniffer type 4 data record format - followed by frame data.
*
* XXX - the manual says that the "flags" field holds "buffer flags;
* BF_xxxx", but doesn't say what the BF_xxxx flags are.
*
* XXX - the manual also says there's an 8-byte "ATMTimeStamp" driver
* time stamp at the end of "ATMSaveInfo", but, from an ATM Sniffer capture
* file I've looked at, that appears not to be the case.
*/
/*
* Fields from the AAL5 trailer for the frame, if it's an AAL5 frame
* rather than a cell.
*/
typedef struct _ATM_AAL5Trailer {
guint16 aal5t_u2u; /* user-to-user indicator */
guint16 aal5t_len; /* length of the packet */
guint32 aal5t_chksum; /* checksum for AAL5 packet */
} ATM_AAL5Trailer;
typedef struct _ATMTimeStamp {
guint32 msw; /* most significant word */
guint32 lsw; /* least significant word */
} ATMTimeStamp;
typedef struct _ATMSaveInfo {
guint32 StatusWord; /* status word from driver */
ATM_AAL5Trailer Trailer; /* AAL5 trailer */
guint8 AppTrafType; /* traffic type */
guint8 AppHLType; /* protocol type */
guint16 AppReserved; /* reserved */
guint16 Vpi; /* virtual path identifier */
guint16 Vci; /* virtual circuit identifier */
guint16 channel; /* link: 0 for DCE, 1 for DTE */
guint16 cells; /* number of cells */
guint32 AppVal1; /* type-dependent */
guint32 AppVal2; /* type-dependent */
} ATMSaveInfo;
/*
* Bits in StatusWord.
*/
#define SW_ERRMASK 0x0F /* Error mask: */
#define SW_RX_FIFO_UNDERRUN 0x01 /* Receive FIFO underrun */
#define SW_RX_FIFO_OVERRUN 0x02 /* Receive FIFO overrun */
#define SW_RX_PKT_TOO_LONG 0x03 /* Received packet > max size */
#define SW_CRC_ERROR 0x04 /* CRC error */
#define SW_USER_ABORTED_RX 0x05 /* User aborted receive */
#define SW_BUF_LEN_TOO_LONG 0x06 /* buffer len > max buf */
#define SW_INTERNAL_T1_ERROR 0x07 /* Internal T1 error */
#define SW_RX_CHANNEL_DEACTIV8 0x08 /* Rx channel deactivate */
#define SW_ERROR 0x80 /* Error indicator */
#define SW_CONGESTION 0x40 /* Congestion indicator */
#define SW_CLP 0x20 /* Cell loss priority indicator */
#define SW_RAW_CELL 0x100 /* RAW cell indicator */
#define SW_OAM_CELL 0x200 /* OAM cell indicator */
/*
* Bits in AppTrafType.
*
* For AAL types other than AAL5, the packet data is presumably for a
* single cell, not a reassembled frame, as the ATM Sniffer manual says
* it dosn't reassemble cells other than AAL5 cells.
*/
#define ATT_AALTYPE 0x0F /* AAL type: */
#define ATT_AAL_UNKNOWN 0x00 /* Unknown AAL */
#define ATT_AAL1 0x01 /* AAL1 */
#define ATT_AAL3_4 0x02 /* AAL3/4 */
#define ATT_AAL5 0x03 /* AAL5 */
#define ATT_AAL_USER 0x04 /* User AAL */
#define ATT_AAL_SIGNALLING 0x05 /* Signaling AAL */
#define ATT_OAMCELL 0x06 /* OAM cell */
#define ATT_HLTYPE 0xF0 /* Higher-layer type: */
#define ATT_HL_UNKNOWN 0x00 /* unknown */
#define ATT_HL_LLCMX 0x10 /* LLC multiplexed (probably RFC 1483) */
#define ATT_HL_VCMX 0x20 /* VC multiplexed (probably RFC 1483) */
#define ATT_HL_LANE 0x30 /* LAN Emulation */
#define ATT_HL_ILMI 0x40 /* ILMI */
#define ATT_HL_FRMR 0x50 /* Frame Relay */
#define ATT_HL_SPANS 0x60 /* FORE SPANS */
#define ATT_HL_IPSILON 0x70 /* Ipsilon */
/*
* Values for AppHLType; the interpretation depends on the ATT_HLTYPE
* bits in AppTrafType.
*/
#define AHLT_UNKNOWN 0x0
#define AHLT_VCMX_802_3_FCS 0x1 /* VCMX: 802.3 FCS */
#define AHLT_LANE_LE_CTRL 0x1 /* LANE: LE Ctrl */
#define AHLT_IPSILON_FT0 0x1 /* Ipsilon: Flow Type 0 */
#define AHLT_VCMX_802_4_FCS 0x2 /* VCMX: 802.4 FCS */
#define AHLT_LANE_802_3 0x2 /* LANE: 802.3 */
#define AHLT_IPSILON_FT1 0x2 /* Ipsilon: Flow Type 1 */
#define AHLT_VCMX_802_5_FCS 0x3 /* VCMX: 802.5 FCS */
#define AHLT_LANE_802_5 0x3 /* LANE: 802.5 */
#define AHLT_IPSILON_FT2 0x3 /* Ipsilon: Flow Type 2 */
#define AHLT_VCMX_FDDI_FCS 0x4 /* VCMX: FDDI FCS */
#define AHLT_LANE_802_3_MC 0x4 /* LANE: 802.3 multicast */
#define AHLT_VCMX_802_6_FCS 0x5 /* VCMX: 802.6 FCS */
#define AHLT_LANE_802_5_MC 0x5 /* LANE: 802.5 multicast */
#define AHLT_VCMX_802_3 0x7 /* VCMX: 802.3 */
#define AHLT_VCMX_802_4 0x8 /* VCMX: 802.4 */
#define AHLT_VCMX_802_5 0x9 /* VCMX: 802.5 */
#define AHLT_VCMX_FDDI 0xa /* VCMX: FDDI */
#define AHLT_VCMX_802_6 0xb /* VCMX: 802.6 */
#define AHLT_VCMX_FRAGMENTS 0xc /* VCMX: Fragments */
#define AHLT_VCMX_BPDU 0xe /* VCMX: BPDU */
struct frame4_rec {
guint16 time_low; /* low part of time stamp */
guint16 time_med; /* middle part of time stamp */
gint8 time_high; /* high part of time stamp */
gint8 time_day; /* time in days since start of capture */
gint16 size; /* number of bytes of data */
gint8 fs; /* frame error status bits */
gint8 flags; /* buffer flags */
gint16 true_size; /* size of original frame, in bytes */
gint16 rsvd3; /* reserved */
gint16 atm_pad; /* pad to 4-byte boundary */
ATMSaveInfo atm_info; /* ATM-specific stuff */
};
/* values for V.timeunit */
#define NUM_NGSNIFF_TIMEUNITS 7
static double Usec[] = { 15.0, 0.838096, 15.0, 0.5, 2.0, 0.0, 0.1 };
static int ngsniffer_read(wtap *wth, int *err);
int ngsniffer_open(wtap *wth, int *err)
{
int bytes_read;
char magic[18];
char record_type[2];
char record_length[4]; /* only the first 2 bytes are length,
the last 2 are "reserved" and are thrown away */
guint16 type, length = 0;
struct vers_rec version;
guint16 start_date;
guint16 start_time;
static const int sniffer_encap[] = {
WTAP_ENCAP_TR,
WTAP_ENCAP_ETHERNET,
WTAP_ENCAP_ARCNET,
WTAP_ENCAP_UNKNOWN, /* StarLAN */
WTAP_ENCAP_UNKNOWN, /* PC Network broadband */
WTAP_ENCAP_UNKNOWN, /* LocalTalk */
WTAP_ENCAP_UNKNOWN, /* Znet */
WTAP_ENCAP_LAPB, /* Internetwork analyzer */
WTAP_ENCAP_UNKNOWN, /* type 8 not defined in Sniffer */
WTAP_ENCAP_FDDI,
WTAP_ENCAP_ATM_SNIFFER /* ATM */
};
#define NUM_NGSNIFF_ENCAPS (sizeof sniffer_encap / sizeof sniffer_encap[0])
struct tm tm;
/* Read in the string that should be at the start of a Sniffer file */
fseek(wth->fh, 0, SEEK_SET);
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(magic, 1, 17, wth->fh);
if (bytes_read != 17) {
if (ferror(wth->fh)) {
*err = errno;
return -1;
}
return 0;
}
magic[17] = 0;
if (strcmp(magic, "TRSNIFF data \x1a")) {
return 0;
}
/*
* Read the first record, which the manual says is a version
* record.
*/
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(record_type, 1, 2, wth->fh);
bytes_read += fread(record_length, 1, 4, wth->fh);
if (bytes_read != 6) {
if (ferror(wth->fh)) {
*err = errno;
return -1;
}
return 0;
}
type = pletohs(record_type);
length = pletohs(record_length);
if (type != REC_VERS) {
g_message("ngsniffer: Sniffer file doesn't start with a version record");
*err = WTAP_ERR_BAD_RECORD;
return -1;
}
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(&version, 1, sizeof version, wth->fh);
if (bytes_read != sizeof version) {
if (ferror(wth->fh)) {
*err = errno;
return -1;
}
return 0;
}
/* Make sure this is an uncompressed Sniffer file */
if (version.format != 1) {
g_message("ngsniffer: Compressed Sniffer files are not supported");
*err = WTAP_ERR_UNSUPPORTED;
return -1;
}
/* Check the data link type */
if (version.network >= NUM_NGSNIFF_ENCAPS
|| sniffer_encap[version.network] == WTAP_ENCAP_UNKNOWN) {
g_message("ngsniffer: network type %u unknown or unsupported",
version.network);
*err = WTAP_ERR_UNSUPPORTED;
return -1;
}
/* Check the time unit */
if (version.timeunit >= NUM_NGSNIFF_TIMEUNITS) {
g_message("ngsniffer: Unknown timeunit %u", version.timeunit);
*err = WTAP_ERR_UNSUPPORTED;
return -1;
}
/* This is a ngsniffer file */
wth->file_type = WTAP_FILE_NGSNIFFER;
wth->capture.ngsniffer = g_malloc(sizeof(ngsniffer_t));
wth->subtype_read = ngsniffer_read;
wth->snapshot_length = 16384; /* not available in header, only in frame */
wth->capture.ngsniffer->timeunit = Usec[version.timeunit];
wth->file_encap = sniffer_encap[version.network];
wth->capture.ngsniffer->is_atm =
(wth->file_encap == WTAP_ENCAP_ATM_SNIFFER);
/* Get capture start time */
start_time = pletohs(&version.time);
start_date = pletohs(&version.date);
tm.tm_year = ((start_date&0xfe00)>>9) + 1980 - 1900;
tm.tm_mon = ((start_date&0x1e0)>>5) - 1;
tm.tm_mday = (start_date&0x1f);
/* The time does not appear to act as an offset; only the date
tm.tm_hour = (start_time&0xf800)>>11;
tm.tm_min = (start_time&0x7e0)>>5;
tm.tm_sec = (start_time&0x1f)<<1;*/
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = -1;
wth->capture.ngsniffer->start = mktime(&tm);
/*
* XXX - what if "secs" is -1? Unlikely,
* but if the capture was done in a time
* zone that switches between standard and
* summer time sometime other than when we
* do, and thus the time was one that doesn't
* exist here because a switch from standard
* to summer time zips over it, it could
* happen.
*
* On the other hand, if the capture was done
* in a different time zone, this won't work
* right anyway; unfortunately, the time zone
* isn't stored in the capture file.
*/
return 1;
}
/* Read the next packet */
static int ngsniffer_read(wtap *wth, int *err)
{
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;
double t;
guint16 time_low, time_med, time_high, true_size, size;
int data_offset;
for (;;) {
/*
* Read the record header.
*/
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(record_type, 1, 2, wth->fh);
if (bytes_read != 2) {
if (ferror(wth->fh)) {
*err = errno;
return -1;
}
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(record_length, 1, 4, wth->fh);
if (bytes_read != 4) {
if (ferror(wth->fh))
*err = errno;
else
*err = WTAP_ERR_SHORT_READ;
return -1;
}
type = pletohs(record_type);
length = pletohs(record_length);
switch (type) {
case REC_FRAME2:
if (wth->capture.ngsniffer->is_atm) {
/*
* We shouldn't get a frame2 record in
* an ATM capture.
*/
g_message("ngsniffer: REC_FRAME2 record in an ATM Sniffer file");
*err = WTAP_ERR_BAD_RECORD;
return -1;
}
/* Read the f_frame2_struct */
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(&frame2, 1, sizeof frame2, wth->fh);
if (bytes_read != sizeof frame2) {
if (ferror(wth->fh))
*err = errno;
else
*err = WTAP_ERR_SHORT_READ;
return -1;
}
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;
wth->phdr.pseudo_header.x25.flags = frame2.fs & 0x80;
goto found;
case REC_FRAME4:
if (!wth->capture.ngsniffer->is_atm) {
/*
* We shouldn't get a frame2 record in
* a non-ATM capture.
*/
g_message("ngsniffer: REC_FRAME4 record in a non-ATM Sniffer file");
*err = WTAP_ERR_BAD_RECORD;
return -1;
}
/* Read the f_frame4_struct */
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(&frame4, 1, sizeof frame4, wth->fh);
if (bytes_read != sizeof frame4) {
if (ferror(wth->fh))
*err = errno;
else
*err = WTAP_ERR_SHORT_READ;
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 */
/*
* 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;
wth->phdr.pseudo_header.ngsniffer_atm.AppTrafType =
frame4.atm_info.AppTrafType;
wth->phdr.pseudo_header.ngsniffer_atm.AppHLType =
frame4.atm_info.AppHLType;
wth->phdr.pseudo_header.ngsniffer_atm.Vpi =
pletohs(&frame4.atm_info.Vpi);
wth->phdr.pseudo_header.ngsniffer_atm.Vci =
pletohs(&frame4.atm_info.Vci);
wth->phdr.pseudo_header.ngsniffer_atm.channel =
pletohs(&frame4.atm_info.channel);
wth->phdr.pseudo_header.ngsniffer_atm.cells =
pletohs(&frame4.atm_info.cells);
wth->phdr.pseudo_header.ngsniffer_atm.aal5t_u2u =
pletohs(&frame4.atm_info.Trailer.aal5t_u2u);
wth->phdr.pseudo_header.ngsniffer_atm.aal5t_len =
pletohs(&frame4.atm_info.Trailer.aal5t_len);
wth->phdr.pseudo_header.ngsniffer_atm.aal5t_chksum =
pletohl(&frame4.atm_info.Trailer.aal5t_chksum);
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;
/*
* Read the packet data.
*/
buffer_assure_space(wth->frame_buffer, length);
data_offset = ftell(wth->fh);
errno = WTAP_ERR_CANT_READ;
bytes_read = fread(buffer_start_ptr(wth->frame_buffer), 1,
length, wth->fh);
if (bytes_read != length) {
if (ferror(wth->fh))
*err = errno;
else
*err = WTAP_ERR_SHORT_READ;
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;
}
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