On Mon, 2009-09-14 at 22:01 -0500, Larry Finger wrote:
> I tried it on the file above and got the following:
>
> fin...@larrylap:~/WAG54GX2> ~/sprom/b43_fwcutter.py
> src.GPL/driver/2.6.8.1/extra/wl.ko
> Firmware md5sum is 4f1218df93c23b4e27c83cb208031a1d...
> Extracting a0g0bsinitvals2 of length 0x10 from offset 0x52A4C...
> Traceback (most recent call last):
> File "/home/finger/sprom/b43_fwcutter.py", line 267, in <module>
> extract_firmware(fd, extract, options.endian, outfn)
> File "/home/finger/sprom/b43_fwcutter.py", line 197, in extract_firmware
> buf, n = build_ivs(buf, endian)
> File "/home/finger/sprom/b43_fwcutter.py", line 169, in build_ivs
> assert biv.size in (2,4)
> AssertionError
>
Oh, sorry... run it with the -b option to indicate that the binary is
big-endian.
You can see the command-line options with --help. Also, I've attached
my script to downloads and inspect /all/ the firmware from the Linksys
site. (Warning: ugly, hackish code to handle ugly, ridiculously
organized archives.)
Dan
#!/usr/bin/python
#
# (C) 2009 by Dan Lenski
#
# Uses b43_finder.py to seek out all the firmware from Linksys's GPL
# code site.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import sys, os, re, tempfile, urllib, hashlib
import tarfile, zipfile
import b43_fwcutter
outdir = sys.argv[1]
def reporthook(blocks, blocksize, totalsize):
sofar = blocks*blocksize
if sofar>1.01e9: amount="%.2f GB"%(sofar/1e9)
elif sofar>1.01e6: amount="%.2f MB"%(sofar/1e6)
elif sofar>1.01e3: amount="%.2f kB"%(sofar/1e3)
else: amount="%.2f B"%sofar
if totalsize: percent = 100.0*sofar/totalsize
else: percent = 100
print "%2d%% - Downloaded %s \r" % (percent, amount),
if percent>=100: print
def search_archive(fn, name):
# open the archive
try:
if name.endswith('.zip'):
print "Opening zipfile..."
archive = zipfile.ZipFile(fn)
getnames = archive.namelist
getfile = archive.open
elif any(x in name for x in ('.tar','.tgz','.gz','.tbz','.bz')):
print "Opening tarball..."
archive = tarfile.open(fn)
getnames = archive.getnames
getfile = archive.extractfile
else:
print "Don't know what to do with archive named '%s'..." % name
print "Skipping..."
return
# get contents
print "Getting contents..."
names = getnames()
except:
print "Couldn't open/list archive named '%s'..." % name
print "Skipping..."
return
# find nested archives and potential firmware-containing binaries
print "Finding files potentially containing firmware..."
nested = [ n for n in names if any(x in n.lower() for x in ('.zip','.tar','.tgz','.gz','.tbz','.bz')) ]
potential = [ n for n in names if re.match('wl(?:\w*)\.k?o', os.path.basename(n)) ]
# stupid archive-inside-archives... RRRGH!
if not potential:
for fn in nested:
tmp = "/tmp/"+hashlib.md5(fn).hexdigest()
if not os.access(tmp, os.F_OK):
print "Extracting nested archive %s..." % fn
try:
open(tmp,"w").write( getfile(fn).read() )
except:
print "Couldn't extract nested archive!!!"
continue
print "Checking nested archive %s..." % fn
search_archive( tmp, fn ) # RECURSE!
# extract potential firmware-containing binaries
for fn in potential:
print "Extracting %s..." % fn
tmp = tempfile.NamedTemporaryFile()
contents = getfile(fn).read()
md5sum = hashlib.md5(contents).hexdigest()
tmp.write( contents )
print "Guessing endian..."
endian = '<'
headers = os.popen("readelf -h %s" % tmp.name).readlines()
for h in headers:
if 'little endian' in h:
endian = '<'
break
elif 'big endian' in h:
endian = '>'
break
print "Cataloging %s..." % fn
extracts = b43_fwcutter.mklist(tmp.name)
if extracts:
print " Found firmware!"
print " MD5SUM of file is %s" % md5sum
print " Saving firmware to %s/%s..." % (outdir, md5sum)
if not os.access("%s/%s" % (outdir, md5sum), os.F_OK):
os.mkdir("%s/%s" % (outdir, md5sum))
open("%s/%s/info.txt" % (outdir, md5sum), "w").write("Archive: %s\nFile: %s\n" % (name, fn))
open(os.path.join(outdir, md5sum, os.path.basename(fn)), "w").write(contents)
for extract in extracts:
print " Extracting %s of length 0x%X from offset 0x%X..." % (
extract.name, extract.length, extract.offset)
outfn = os.path.join(outdir, md5sum, extract.name+".fw")
b43_fwcutter.extract_firmware(tmp, extract, endian, outfn)
######################################################################
# get list of GPL code archives from Linksys
page = urllib.urlopen("http://www.linksysbycisco.com/gpl";).read()
archives = re.findall('''href=['"](http://downloads.linksysbycisco.com/.+)['"]''', page)
archives.insert(0, archives.pop(archives.index('http://downloads.linksysbycisco.com/downloads/wrt610n_v1.00.02.10_us.tar,0.gz')))
# go through 'em one-by-one
for archive in archives:
tmp = "/tmp/"+hashlib.md5(archive).hexdigest()
if not os.access(tmp, os.F_OK):
print "Downloading %s..." % archive
tmp, headers = urllib.urlretrieve(archive, tmp, reporthook=reporthook)
print "Checking archive from %s for firmware..." % archive
search_archive(tmp, archive)
print "Done with %s..." % archive
print "=================================================="
print
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