Added Guy's netmon.[ch] files to CVS for him. His firewall admins forgot
to add ssh to their firewall rules, so he's out of CVS for a few days. This adds support for MS Network Monitor files to wiretap. svn path=/trunk/; revision=172
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/* netmon.c
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*
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* $Id: netmon.c,v 1.1 1999/01/18 21:34:54 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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#include "wtap.h"
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#include "netmon.h"
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#include <netinet/in.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 eader, *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 files. */
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static char netmon_magic[] = {
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'R', 'T', 'S', 'S'
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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 record header; not defined in STRUCT.H, but deduced by
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* looking at capture files. */
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struct netmonrec_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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/* Returns WTAP_FILE_NETMON on success, WTAP_FILE_UNKNOWN on failure */
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int netmon_open(wtap *wth)
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{
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int bytes_read;
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char magic[sizeof netmon_magic];
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struct netmon_hdr hdr;
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static const int netmon_encap[] = {
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WTAP_ENCAP_NONE,
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WTAP_ENCAP_ETHERNET
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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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/* Read in the string that should be at the start of a Network
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* Monitor file */
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fseek(wth->fh, 0, SEEK_SET);
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bytes_read = fread(magic, 1, sizeof magic, wth->fh);
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if (bytes_read != sizeof magic) {
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return WTAP_FILE_UNKNOWN;
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}
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if (memcmp(magic, netmon_magic, sizeof netmon_magic) != 0) {
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return WTAP_FILE_UNKNOWN;
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}
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/* Read the rest of the header. */
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bytes_read = fread(&hdr, 1, sizeof hdr, wth->fh);
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if (bytes_read != sizeof hdr) {
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return WTAP_FILE_UNKNOWN;
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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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g_error("netmon: network type %d unknown", hdr.network);
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return WTAP_FILE_UNKNOWN;
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}
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/* This is a netmon file */
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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->encapsulation = 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_msecs = pletohs(&hdr.ts_msec);
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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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/*wth->frame_number = 0;*/
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/*wth->file_byte_offset = 0x10b;*/
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/* Seek to the beginning of the data records. */
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fseek(wth->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET);
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return WTAP_FILE_NETMON;
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}
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/* Read the next packet */
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int netmon_read(wtap *wth)
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{
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int packet_size;
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int bytes_read;
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struct netmonrec_hdr hdr;
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int data_offset;
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time_t secs;
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guint32 msecs;
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/* Have we reached the end of the packet data? */
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data_offset = ftell(wth->fh);
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if (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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bytes_read = fread(&hdr, 1, sizeof hdr, wth->fh);
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if (bytes_read != sizeof hdr) {
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if (bytes_read != 0) {
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g_error("netmon_read: not enough packet header data (%d bytes)",
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bytes_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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data_offset += sizeof hdr;
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packet_size = pletohs(&hdr.incl_len);
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buffer_assure_space(&wth->frame_buffer, packet_size);
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bytes_read = fread(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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if (ferror(wth->fh)) {
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g_error("netmon_read: fread for data: read error\n");
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} else {
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g_error("netmon_read: fread for data: %d bytes out of %d",
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bytes_read, packet_size);
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}
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return -1;
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}
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msecs = wth->capture.netmon->start_msecs + pletohl(&hdr.ts_delta);
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secs = wth->capture.netmon->start_secs + msecs/1000;
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msecs = msecs%1000;
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wth->phdr.ts.tv_sec = secs;
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wth->phdr.ts.tv_usec = msecs*1000;
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wth->phdr.caplen = packet_size;
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wth->phdr.len = pletohs(&hdr.orig_len);
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wth->phdr.pkt_encap = wth->encapsulation;
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return data_offset;
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}
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/* netmon.h
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*
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* $Id: netmon.h,v 1.1 1999/01/18 21:34:54 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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int netmon_open(wtap *wth);
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int netmon_read(wtap *wth);
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