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#!/usr/bin/env python
"""
Converts netscreen snoop hex-dumps to a hex-dump that text2pcap can read.
Copyright (c) 2004 by Gilbert Ramirez <gram@alumni.rice.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
import sys
import re
import os
import stat
import time
class OutputFile:
TIMER_MAX = 99999.9
def __init__(self, name, base_time):
try:
self.fh = open(name, "w")
except IOError, err:
sys.exit(err)
self.base_time = base_time
self.prev_timestamp = 0.0
def PrintPacket(self, timestamp, datalines):
# What do to with the timestamp? I need more data about what
# the netscreen timestamp is, then I can generate one for the text file.
# print "TS:", timestamp.group("time")
try:
timestamp = float(timestamp.group("time"))
except ValueError:
sys.exit("Unable to convert '%s' to floating point." % \
(timestamp,))
# Did we wrap around the timeer max?
if timestamp < self.prev_timestamp:
self.base_time += self.TIMER_MAX
self.prev_timestamp = timestamp
packet_timestamp = self.base_time + timestamp
# Determine the time string to print
gmtime = time.gmtime(packet_timestamp)
subsecs = packet_timestamp - int(packet_timestamp)
assert subsecs <= 0
subsecs = int(subsecs * 10)
print >> self.fh, "%s.%d" % (time.strftime("%Y-%m-%d %H:%M:%S", gmtime), \
subsecs)
# Print the packet data
offset = 0
for lineno, hexgroup in datalines:
hexline = hexgroup.group("hex")
hexpairs = hexline.split()
print >> self.fh, "%08x %s" % (offset, hexline)
offset += len(hexpairs)
# Blank line
print >> self.fh
# Find a timestamp line
re_timestamp = re.compile(r"^(?P<time>\d+\.\d): [\w/]+\((?P<io>.)\)(:| len=)")
# Find a hex dump line
re_hex_line = re.compile(r"(?P<hex>([0-9a-f]{2} ){1,16})\s+(?P<ascii>.){1,16}")
def run(input_filename, output_filename):
try:
ifh = open(input_filename, "r")
except IOError, err:
sys.exit(err)
# Get the file's creation time.
try:
ctime = os.stat(input_filename)[stat.ST_CTIME]
except OSError, err:
sys.exit(err)
output_file = OutputFile(output_filename, ctime)
timestamp = None
datalines = []
lineno = 0
for line in ifh.xreadlines():
lineno += 1
# If we have no timestamp yet, look for one
if not timestamp:
m = re_timestamp.search(line)
if m:
timestamp = m
# Otherwise, look for hex dump lines
else:
m = re_hex_line.search(line)
if m:
datalines.append((lineno, m))
else:
# If we have been gathering hex dump lines,
# and this line is not a hex dump line, then the hex dump
# has finished, and so has the packet. So print the packet
# and reset our variables so we can look for the next packet.
if datalines:
output_file.PrintPacket(timestamp, datalines)
timestamp = None
datalines = []
# At the end of the file we may still have hex dump data in memory.
# If so, print the packet
if datalines:
output_file.PrintPacket(timestamp, datalines)
timestamp = None
datalines = []
def usage():
print >> sys.stderr, "Usage: netscreen2dump.py netscreen-dump-file new-dump-file"
sys.exit(1)
def main():
if len(sys.argv) != 3:
usage()
run(sys.argv[1], sys.argv[2])
if __name__ == "__main__":
main()
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