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#!/usr/bin/env python
import sys
import getopt
import os
import subprocess
import re
import pax
def get_ldd_linkings(elf):
try:
#When subprocess.DEVNULL makes it to python, change this: http://bugs.python.org/issue5870
ldd_output = subprocess.check_output(['/usr/bin/ldd', elf], stderr=subprocess.PIPE)
except:
# We should record these elfs which are probably static
return []
ldd_lines = ldd_output.split('\n')
linkings = []
mappings = {}
for m in range(0,len(ldd_lines)):
if not re.search('=>', ldd_lines[m]):
continue
ldd_lines[m] = ldd_lines[m].strip()
mapp = re.split('=>', ldd_lines[m] )
soname = mapp[0].strip()
soname = os.path.basename(soname) # This is for ./libSDL-1.2.so.0
filename = re.sub('\(.*$', '', mapp[1]).strip()
if filename == '':
continue
filename = os.path.realpath(filename)
linkings.append(soname)
mappings[soname] = filename
return ( linkings, mappings )
def get_forward_linkings():
# I'm still not sure we wan to use /var/db/pkg vs some path of binaries
var_db_pkg = '/var/db/pkg'
forward_linkings = {}
so2filename_mappings = {}
for cat in os.listdir(var_db_pkg):
catdir = '%s/%s' % (var_db_pkg, cat)
for pkg in os.listdir(catdir):
pkgdir = '%s/%s' % (catdir, pkg)
need = '%s/%s' % (pkgdir, 'NEEDED')
try:
g = open(need, 'r')
needs = g.readlines()
for line in needs:
line = line.strip()
link = re.split('\s', line)
elf = link[0]
( linkings, mappings ) = get_ldd_linkings(elf)
forward_linkings[elf] = linkings
so2filename_mappings.update(mappings)
except:
continue
return ( forward_linkings, so2filename_mappings )
def invert_linkings( forward_linkings ):
reverse_linkings = {}
for elf in forward_linkings:
for elf_dep in forward_linkings[elf]:
reverse_linkings[elf_dep] = []
for elf in forward_linkings:
for elf_dep in forward_linkings[elf]:
reverse_linkings[elf_dep].append(elf)
return reverse_linkings
def print_forward_linkings( forward_linkings, so2filename_mappings ):
missing_elfs = []
missing_links = []
for elf in forward_linkings:
try:
print elf, '(', pax.getflags(elf), ')'
except:
missing_elfs.append(elf)
continue
for elf_dep in forward_linkings[elf]:
try:
filename = so2filename_mappings[elf_dep]
flags = pax.getflags(filename)
print '\t', elf_dep, '\t', filename, '(', flags, ')'
except:
missing_links.append(elf_dep)
missing_elfs = set(missing_elfs)
print '\n\n'
print '**** Missing elfs ****'
for m in missing_elfs:
print m
missing_links = set(missing_links)
print '\n\n'
print '**** Missing forward linkings ****'
for m in missing_links:
print m
print '\n\n'
def print_reverse_linkings( reverse_linkings, so2filename_mappings ):
missing_elfs = []
missing_links = []
for elf in reverse_linkings:
try:
filename = so2filename_mappings[elf]
flags = pax.getflags(filename)
print elf, '\t', filename, '(', flags, ')'
except:
missing_elfs.append(elf)
for elf_dep in reverse_linkings[elf]:
try:
flags = pax.getflags(elf_dep)
print '\t', elf_dep, '(', flags, ')'
except:
missing_links.append(elf_dep)
missing_elfs = set(missing_elfs)
print '\n\n'
print '**** Missing elfs ****'
for m in missing_elfs:
print m
missing_links = set(missing_links)
print '\n\n'
print '**** Missing reverse linkings ****'
for m in missing_links:
print m
print '\n\n'
def usage():
print 'Package Name : elfix\n'
print 'Bug Reports : http://bugs.gentoo.org/'
print 'Program Name : revdep-pax\n'
print 'Description : Get or set pax flags on an ELF object\n\n'
print 'Usage : revdep-pax [-fv] | [-rv] | -v [-b BINARY] | -v [-s SONAME] | -h\n\n'
print 'Options : -f print out all the forward mappings for all system binaries\n'
print ' : -r print out all the reverse mappints for all system sonames\n'
print ' : -b BINARY print all the forward mappings only for BINARY\n'
print ' : -s SONAME print all the reverse mappings only for SONAME\n'
print ' : -v verbose, otherwise just print mismatched pax flags \n'
print ' : -h print out this help\n\n'
def run_forward():
( forward_linkings, so2filename_mappings ) = get_forward_linkings()
print_forward_linkings( forward_linkings, so2filename_mappings )
def run_reverse():
( forward_linkings, so2filename_mappings ) = get_forward_linkings()
reverse_linkings = invert_linkings( forward_linkings )
print_reverse_linkings( reverse_linkings, so2filename_mappings )
def run_binary(binary, verbose):
( linkings, mappings ) = get_ldd_linkings(binary)
binary_flags = pax.getflags(binary)
print binary, '(', binary_flags, ')'
count = 0
for soname in linkings:
try:
filename = mappings[soname]
soname_flags = pax.getflags(filename)
if verbose:
print '\t', soname, '\t', filename, '(', soname_flags, ')'
else:
if binary_flags != soname_flags:
print '\t', soname, '\t',filename, '(', soname_flags, ')'
count = count + 1
except:
print "file for soname %s not found" % soname
if count == 0:
print '\nNo mismatches'
def run_soname(soname, verbose):
( forward_linkings, so2filename_mappings ) = get_forward_linkings()
reverse_linkings = invert_linkings( forward_linkings )
linkings = reverse_linkings[soname]
library = so2filename_mappings[soname]
flags = pax.getflags(library)
if verbose:
print soname, '\t', library, '(', flags, ')'
for binary in linkings:
try:
flags = pax.getflags(binary)
if verbose:
print '\t', binary, '(', flags, ')'
except:
print "cannot obtain pax flags for %s" % binary
def main():
try:
opts, args = getopt.getopt(sys.argv[1:], 'hfrb:s:v')
except getopt.GetoptError, err:
print str(err) # will print something like 'option -a not recognized'
usage()
sys.exit(1)
if len(opts) == 0:
usage()
sys.exit(1)
do_usage = False
do_forward = False
do_reverse = False
binary = None
soname = None
verbose = False
for o, a in opts:
if o == '-h':
do_usage = True
elif o == '-f':
do_forward = True
elif o == '-r':
do_reverse = True
elif o == '-b':
binary = a
elif o == '-s':
soname = a
elif o == '-v':
verbose = True
else:
print 'Option included in getopt but not handled here!'
print 'Please file a bug'
sys.exit(1)
if do_usage:
run_usage()
if do_forward:
run_forward()
if do_reverse:
run_reverse()
if binary != None:
run_binary(binary, verbose)
if soname !=None:
run_soname(soname)
if __name__ == '__main__':
main()
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