607 lines
18 KiB
C
607 lines
18 KiB
C
/* netmon.c
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*
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* $Id: netmon.c,v 1.23 2000/01/13 07:09:17 guy 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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#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 <time.h>
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#include <string.h>
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#include "wtap.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "netmon.h"
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/* The file at
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*
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* ftp://ftp.microsoft.com/developr/drg/cifs/cifs/Bhfile.zip
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*
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* contains "STRUCT.H", which declares the typedef CAPTUREFILE_HEADER
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* for the header of a Microsoft Network Monitor capture file.
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*/
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/* Capture file header, *including* magic number, is padded to 128 bytes. */
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#define CAPTUREFILE_HEADER_SIZE 128
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/* Magic number in Network Monitor 1.x files. */
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static const char netmon_1_x_magic[] = {
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'R', 'T', 'S', 'S'
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};
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/* Magic number in Network Monitor 2.x files. */
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static const char netmon_2_x_magic[] = {
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'G', 'M', 'B', 'U'
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};
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/* Network Monitor file header (minus magic number). */
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struct netmon_hdr {
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guint8 ver_minor; /* minor version number */
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guint8 ver_major; /* major version number */
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guint16 network; /* network type */
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guint16 ts_year; /* year of capture start */
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guint16 ts_month; /* month of capture start (January = 1) */
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guint16 ts_dow; /* day of week of capture start (Sun = 0) */
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guint16 ts_day; /* day of month of capture start */
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guint16 ts_hour; /* hour of capture start */
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guint16 ts_min; /* minute of capture start */
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guint16 ts_sec; /* second of capture start */
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guint16 ts_msec; /* millisecond of capture start */
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guint32 frametableoffset; /* frame index table offset */
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guint32 frametablelength; /* frame index table size */
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guint32 userdataoffset; /* user data offset */
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guint32 userdatalength; /* user data size */
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guint32 commentdataoffset; /* comment data offset */
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guint32 commentdatalength; /* comment data size */
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guint32 statisticsoffset; /* offset to statistics structure */
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guint32 statisticslength; /* length of statistics structure */
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guint32 networkinfooffset; /* offset to network info structure */
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guint32 networkinfolength; /* length of network info structure */
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};
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/* Network Monitor 1.x record header; not defined in STRUCT.H, but deduced by
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* looking at capture files. */
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struct netmonrec_1_x_hdr {
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guint32 ts_delta; /* time stamp - msecs since start of capture */
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guint16 orig_len; /* actual length of packet */
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guint16 incl_len; /* number of octets captured in file */
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};
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/* Network Monitor 2.x record header; not defined in STRUCT.H, but deduced by
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* looking at capture files. */
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struct netmonrec_2_x_hdr {
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guint32 ts_delta_lo; /* time stamp - usecs since start of capture */
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guint32 ts_delta_hi; /* time stamp - usecs since start of capture */
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guint32 orig_len; /* actual length of packet */
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guint32 incl_len; /* number of octets captured in file */
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};
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static int netmon_read(wtap *wth, int *err);
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static gboolean netmon_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
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const u_char *pd, int *err);
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static gboolean netmon_dump_close(wtap_dumper *wdh, int *err);
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int netmon_open(wtap *wth, int *err)
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{
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int bytes_read;
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char magic[sizeof netmon_1_x_magic];
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struct netmon_hdr hdr;
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int file_type;
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static const int netmon_encap[] = {
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WTAP_ENCAP_UNKNOWN,
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WTAP_ENCAP_ETHERNET,
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WTAP_ENCAP_TR,
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WTAP_ENCAP_FDDI_BITSWAPPED,
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WTAP_ENCAP_UNKNOWN, /* WAN */
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WTAP_ENCAP_UNKNOWN, /* LocalTalk */
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WTAP_ENCAP_UNKNOWN, /* "DIX" - should not occur */
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WTAP_ENCAP_UNKNOWN, /* ARCNET raw */
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WTAP_ENCAP_UNKNOWN, /* ARCNET 878.2 */
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WTAP_ENCAP_UNKNOWN, /* ATM */
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WTAP_ENCAP_UNKNOWN, /* Wireless WAN */
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WTAP_ENCAP_UNKNOWN /* IrDA */
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};
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#define NUM_NETMON_ENCAPS (sizeof netmon_encap / sizeof netmon_encap[0])
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struct tm tm;
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guint32 frame_table_length;
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guint32 first_frame_table_entry;
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/* Read in the string that should be at the start of a Network
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* Monitor file */
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file_seek(wth->fh, 0, SEEK_SET);
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(magic, 1, sizeof magic, wth->fh);
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if (bytes_read != sizeof magic) {
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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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if (memcmp(magic, netmon_1_x_magic, sizeof netmon_1_x_magic) != 0
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&& memcmp(magic, netmon_2_x_magic, sizeof netmon_1_x_magic) != 0) {
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return 0;
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}
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/* Read the rest of the header. */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, 1, sizeof hdr, wth->fh);
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if (bytes_read != sizeof hdr) {
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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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switch (hdr.ver_major) {
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case 1:
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file_type = WTAP_FILE_NETMON_1_x;
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break;
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case 2:
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file_type = WTAP_FILE_NETMON_2_x;
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break;
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default:
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g_message("netmon: major version %u unsupported", hdr.ver_major);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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hdr.network = pletohs(&hdr.network);
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if (hdr.network >= NUM_NETMON_ENCAPS
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|| netmon_encap[hdr.network] == WTAP_ENCAP_UNKNOWN) {
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g_message("netmon: network type %u unknown or unsupported",
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hdr.network);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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/* This is a netmon file */
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wth->file_type = file_type;
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wth->capture.netmon = g_malloc(sizeof(netmon_t));
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wth->subtype_read = netmon_read;
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wth->file_encap = netmon_encap[hdr.network];
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wth->snapshot_length = 16384; /* XXX - not available in header */
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/*
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* Convert the time stamp to a "time_t" and a number of
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* milliseconds.
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*/
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tm.tm_year = pletohs(&hdr.ts_year) - 1900;
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tm.tm_mon = pletohs(&hdr.ts_month) - 1;
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tm.tm_mday = pletohs(&hdr.ts_day);
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tm.tm_hour = pletohs(&hdr.ts_hour);
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tm.tm_min = pletohs(&hdr.ts_min);
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tm.tm_sec = pletohs(&hdr.ts_sec);
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tm.tm_isdst = -1;
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wth->capture.netmon->start_secs = mktime(&tm);
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/*
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* XXX - what if "secs" is -1? Unlikely, but if the capture was
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* done in a time zone that switches between standard and summer
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* time sometime other than when we do, and thus the time was one
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* that doesn't exist here because a switch from standard to summer
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* time zips over it, it could happen.
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*
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* On the other hand, if the capture was done in a different time
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* zone, this won't work right anyway; unfortunately, the time
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* zone isn't stored in the capture file (why the hell didn't
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* they stuff a FILETIME, which is the number of 100-nanosecond
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* intervals since 1601-01-01 00:00:00 "UTC", there, instead
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* of stuffing a SYSTEMTIME, which is time-zone-dependent, there?).
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*/
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wth->capture.netmon->start_usecs = pletohs(&hdr.ts_msec)*1000;
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wth->capture.netmon->version_major = hdr.ver_major;
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/*
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* The "frame index table" appears to come after the last
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* packet; remember its offset, so we know when we have no
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* more packets to read.
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*/
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wth->capture.netmon->end_offset = pletohl(&hdr.frametableoffset);
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/*
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* It appears that some NetMon 2.x files don't have the
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* first packet starting exactly 128 bytes into the file.
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* So we read the first entry from the frame table, and
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* use that as the offset of the first packet.
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*
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* First, make sure the frame table has at least one entry
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* in it....
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*/
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frame_table_length = pletohl(&hdr.frametablelength);
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if (frame_table_length < sizeof first_frame_table_entry) {
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g_message("netmon: frame table length is %u, which means it's less than one entry in size",
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frame_table_length);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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/*
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* Now read that entry. (It appears that the N+1st frame immediately
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* follows the Nth frame, so we don't need any entries after the
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* first entry.)
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*/
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errno = WTAP_ERR_CANT_READ;
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file_seek(wth->fh, wth->capture.netmon->end_offset, SEEK_SET);
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bytes_read = file_read(&first_frame_table_entry, 1,
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sizeof first_frame_table_entry, wth->fh);
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if (bytes_read != sizeof first_frame_table_entry) {
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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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/* Seek to the beginning of the data records. */
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wth->data_offset = pletohl(&first_frame_table_entry);
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file_seek(wth->fh, wth->data_offset, SEEK_SET);
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return 1;
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}
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/* Read the next packet */
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static int netmon_read(wtap *wth, int *err)
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{
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guint32 packet_size = 0;
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int bytes_read;
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union {
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struct netmonrec_1_x_hdr hdr_1_x;
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struct netmonrec_2_x_hdr hdr_2_x;
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} hdr;
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int hdr_size = 0;
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int data_offset;
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time_t secs;
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guint32 usecs;
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double t;
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/* Have we reached the end of the packet data? */
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if (wth->data_offset >= wth->capture.netmon->end_offset) {
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/* Yes. */
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return 0;
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}
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/* Read record header. */
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switch (wth->capture.netmon->version_major) {
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case 1:
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hdr_size = sizeof (struct netmonrec_1_x_hdr);
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break;
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case 2:
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hdr_size = sizeof (struct netmonrec_2_x_hdr);
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break;
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}
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, 1, hdr_size, wth->fh);
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if (bytes_read != hdr_size) {
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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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if (bytes_read != 0) {
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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return 0;
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}
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wth->data_offset += hdr_size;
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switch (wth->capture.netmon->version_major) {
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case 1:
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packet_size = pletohs(&hdr.hdr_1_x.incl_len);
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break;
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case 2:
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packet_size = pletohl(&hdr.hdr_2_x.incl_len);
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break;
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}
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if (packet_size > WTAP_MAX_PACKET_SIZE) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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g_message("netmon: File has %u-byte packet, bigger than maximum of %u",
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packet_size, WTAP_MAX_PACKET_SIZE);
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*err = WTAP_ERR_BAD_RECORD;
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return -1;
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}
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buffer_assure_space(wth->frame_buffer, packet_size);
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data_offset = wth->data_offset;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(buffer_start_ptr(wth->frame_buffer), 1,
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packet_size, wth->fh);
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if (bytes_read != packet_size) {
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*err = file_error(wth->fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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wth->data_offset += packet_size;
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t = (double)wth->capture.netmon->start_usecs;
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switch (wth->capture.netmon->version_major) {
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case 1:
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t += ((double)pletohl(&hdr.hdr_1_x.ts_delta))*1000;
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break;
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case 2:
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t += (double)pletohl(&hdr.hdr_2_x.ts_delta_lo)
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+ (double)pletohl(&hdr.hdr_2_x.ts_delta_hi)*4294967296.0;
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break;
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}
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secs = (time_t)(t/1000000);
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usecs = (guint32)(t - secs*1000000);
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wth->phdr.ts.tv_sec = wth->capture.netmon->start_secs + secs;
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wth->phdr.ts.tv_usec = usecs;
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wth->phdr.caplen = packet_size;
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switch (wth->capture.netmon->version_major) {
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case 1:
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wth->phdr.len = pletohs(&hdr.hdr_1_x.orig_len);
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break;
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case 2:
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wth->phdr.len = pletohl(&hdr.hdr_2_x.orig_len);
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break;
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}
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wth->phdr.pkt_encap = wth->file_encap;
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return data_offset;
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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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1, /* WTAP_ENCAP_ETHERNET -> NDIS Ethernet */
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2, /* WTAP_ENCAP_TR -> NDIS Token Ring */
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-1, /* WTAP_ENCAP_SLIP -> unsupported */
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-1, /* WTAP_ENCAP_PPP -> unsupported */
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3, /* WTAP_ENCAP_FDDI -> NDIS FDDI */
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3, /* WTAP_ENCAP_FDDI_BITSWAPPED -> NDIS FDDI */
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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_SNIFFER -> 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 netmon_dump_can_write_encap(int filetype, 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 || 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 netmon_dump_open(wtap_dumper *wdh, int *err)
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{
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/* This is a netmon file */
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wdh->subtype_write = netmon_dump;
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wdh->subtype_close = netmon_dump_close;
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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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fseek(wdh->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET);
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wdh->private.netmon = g_malloc(sizeof(netmon_dump_t));
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wdh->private.netmon->frame_table_offset = CAPTUREFILE_HEADER_SIZE;
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wdh->private.netmon->got_first_record_time = FALSE;
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wdh->private.netmon->frame_table = NULL;
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wdh->private.netmon->frame_table_index = 0;
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wdh->private.netmon->frame_table_size = 0;
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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 netmon_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
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const u_char *pd, int *err)
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{
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netmon_dump_t *priv = wdh->private.netmon;
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struct netmonrec_1_x_hdr rec_1_x_hdr;
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struct netmonrec_2_x_hdr rec_2_x_hdr;
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char *hdrp;
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int hdr_size;
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int nwritten;
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/* NetMon files have a capture start time in the file header,
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and have times relative to that in the packet headers;
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pick the time of the first packet as the capture start
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time. */
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if (!priv->got_first_record_time) {
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priv->first_record_time = phdr->ts;
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priv->got_first_record_time = TRUE;
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}
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switch (wdh->file_type) {
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case WTAP_FILE_NETMON_1_x:
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rec_1_x_hdr.ts_delta = htolel(
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(phdr->ts.tv_sec - priv->first_record_time.tv_sec)*1000
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+ (phdr->ts.tv_usec - priv->first_record_time.tv_usec + 500)/1000);
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rec_1_x_hdr.orig_len = htoles(phdr->len);
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rec_1_x_hdr.incl_len = htoles(phdr->caplen);
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hdrp = (char *)&rec_1_x_hdr;
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hdr_size = sizeof rec_1_x_hdr;
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break;
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case WTAP_FILE_NETMON_2_x:
|
|
/* XXX - fill in 64-bit time diff in microseconds */
|
|
rec_2_x_hdr.orig_len = htolel(phdr->len);
|
|
rec_2_x_hdr.incl_len = htolel(phdr->caplen);
|
|
hdrp = (char *)&rec_2_x_hdr;
|
|
hdr_size = sizeof rec_2_x_hdr;
|
|
break;
|
|
|
|
default:
|
|
/* We should never get here - our open routine
|
|
should only get called for the types above. */
|
|
*err = WTAP_ERR_UNSUPPORTED_FILE_TYPE;
|
|
return FALSE;
|
|
}
|
|
|
|
nwritten = fwrite(hdrp, 1, hdr_size, wdh->fh);
|
|
if (nwritten != hdr_size) {
|
|
if (nwritten < 0)
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
|
|
if (nwritten != phdr->caplen) {
|
|
if (nwritten < 0)
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* Stash the file offset of this frame.
|
|
*/
|
|
if (priv->frame_table_size == 0) {
|
|
/*
|
|
* Haven't yet allocated the buffer for the frame table.
|
|
*/
|
|
priv->frame_table = g_malloc(1024 * sizeof *priv->frame_table);
|
|
priv->frame_table_size = 1024;
|
|
} else {
|
|
/*
|
|
* We've allocated it; are we at the end?
|
|
*/
|
|
if (priv->frame_table_index >= priv->frame_table_size) {
|
|
/*
|
|
* Yes - double the size of the frame table.
|
|
*/
|
|
priv->frame_table_size *= 2;
|
|
priv->frame_table = g_realloc(priv->frame_table,
|
|
priv->frame_table_size * sizeof *priv->frame_table);
|
|
}
|
|
}
|
|
priv->frame_table[priv->frame_table_index] =
|
|
htolel(priv->frame_table_offset);
|
|
priv->frame_table_index++;
|
|
priv->frame_table_offset += hdr_size + phdr->caplen;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Finish writing to a dump file.
|
|
Returns TRUE on success, FALSE on failure. */
|
|
static gboolean netmon_dump_close(wtap_dumper *wdh, int *err)
|
|
{
|
|
netmon_dump_t *priv = wdh->private.netmon;
|
|
int n_to_write;
|
|
int nwritten;
|
|
struct netmon_hdr file_hdr;
|
|
const char *magicp;
|
|
int magic_size;
|
|
struct tm *tm;
|
|
|
|
/* Write out the frame table. "priv->frame_table_index" is
|
|
the number of entries we've put into it. */
|
|
n_to_write = priv->frame_table_index * sizeof *priv->frame_table;
|
|
nwritten = fwrite(priv->frame_table, 1, n_to_write, wdh->fh);
|
|
if (nwritten != n_to_write) {
|
|
if (nwritten < 0)
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
/* Now go fix up the file header. */
|
|
fseek(wdh->fh, 0, SEEK_SET);
|
|
memset(&file_hdr, '\0', sizeof file_hdr);
|
|
switch (wdh->file_type) {
|
|
|
|
case WTAP_FILE_NETMON_1_x:
|
|
magicp = netmon_1_x_magic;
|
|
magic_size = sizeof netmon_1_x_magic;
|
|
/* current NetMon version, for 1.x, is 1.1 */
|
|
file_hdr.ver_minor = 1;
|
|
file_hdr.ver_major = 1;
|
|
break;
|
|
|
|
case WTAP_FILE_NETMON_2_x:
|
|
magicp = netmon_2_x_magic;
|
|
magic_size = sizeof netmon_2_x_magic;
|
|
/* XXX - fill in V2 stuff. */
|
|
break;
|
|
|
|
default:
|
|
/* We should never get here - our open routine
|
|
should only get called for the types above. */
|
|
*err = WTAP_ERR_UNSUPPORTED_FILE_TYPE;
|
|
return FALSE;
|
|
}
|
|
nwritten = fwrite(magicp, 1, magic_size, wdh->fh);
|
|
if (nwritten != magic_size) {
|
|
if (nwritten < 0)
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
file_hdr.network = htoles(wtap_encap[wdh->encap]);
|
|
tm = localtime(&priv->first_record_time.tv_sec);
|
|
file_hdr.ts_year = htoles(1900 + tm->tm_year);
|
|
file_hdr.ts_month = htoles(tm->tm_mon + 1);
|
|
file_hdr.ts_dow = htoles(tm->tm_wday);
|
|
file_hdr.ts_day = htoles(tm->tm_mday);
|
|
file_hdr.ts_hour = htoles(tm->tm_hour);
|
|
file_hdr.ts_min = htoles(tm->tm_min);
|
|
file_hdr.ts_sec = htoles(tm->tm_sec);
|
|
file_hdr.ts_msec = htoles(priv->first_record_time.tv_usec/1000);
|
|
/* XXX - what about rounding? */
|
|
file_hdr.frametableoffset = htolel(priv->frame_table_offset);
|
|
file_hdr.frametablelength =
|
|
htolel(priv->frame_table_index * sizeof *priv->frame_table);
|
|
nwritten = fwrite(&file_hdr, 1, sizeof file_hdr, wdh->fh);
|
|
if (nwritten != sizeof file_hdr) {
|
|
if (nwritten < 0)
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|