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#!/usr/bin/env python
import unittest
import logging
import os
import sys
import stat
import re
import subprocess
import tempfile
import shutil
import lief
from lief import Logger
Logger.set_level(lief.LOGGING_LEVEL.INFO)
from subprocess import Popen
from unittest import TestCase
from utils import get_sample
CURRENT_DIRECTORY = os.path.dirname(os.path.abspath(__file__))
STUB = lief.parse(os.path.join(CURRENT_DIRECTORY, "hello_lief.bin"))
LIBADD_C = """\
#include <stdlib.h>
#include <stdio.h>
int add(int a, int b);
int add(int a, int b) {
printf("%d + %d = %d\\n", a, b, a + b);
return a + b;
}
"""
BINADD_C = """\
#include <stdio.h>
#include <stdlib.h>
int add(int a, int b);
int main(int argc, char **argv) {
if (argc != 3) {
printf("Usage: %s <a> <b>\\n", argv[0]);
exit(-1);
}
int res = add(atoi(argv[1]), atoi(argv[2]));
printf("From myLIb, a + b = %d\\n", res);
return 0;
}
"""
class LibAddSample(object):
COUNT = 0
def __init__(self):
self.logger = logging.getLogger(__name__)
self.tmp_dir = tempfile.mkdtemp(suffix='_lief_sample_{:d}'.format(LibAddSample.COUNT))
self.logger.debug("temp dir: {}".format(self.tmp_dir))
LibAddSample.COUNT += 1
self.binadd_path = os.path.join(self.tmp_dir, "binadd.c")
self.libadd_path = os.path.join(self.tmp_dir, "libadd.c")
self.libadd_so = os.path.join(self.tmp_dir, "libadd.so")
self.binadd_bin = os.path.join(self.tmp_dir, "binadd.bin")
self.compiler = '/usr/bin/cc'
if self.compiler is None:
self.logger.error("Unable to find a compiler")
sys.exit(0)
self.logger.debug("Compiler: {}".format(self.compiler))
with open(self.binadd_path, 'w') as f:
f.write(BINADD_C)
with open(self.libadd_path, 'w') as f:
f.write(LIBADD_C)
self._compile_libadd()
self._compile_binadd()
def _compile_libadd(self, extra_flags=[]):
if os.path.isfile(self.libadd_so):
os.remove(self.libadd_so)
CC_FLAGS = ['-fPIC', '-shared', '-Wl,-soname,libadd.so'] + extra_flags
cmd = [self.compiler, '-o', self.libadd_so] + CC_FLAGS + [self.libadd_path]
self.logger.debug("Compile 'libadd' with: {}".format(" ".join(cmd)))
p = Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, _ = p.communicate()
self.logger.debug(stdout)
def _compile_binadd(self, extra_flags=[]):
if os.path.isfile(self.binadd_bin):
os.remove(self.binadd_bin)
CC_FLAGS = ['-L', self.tmp_dir] + extra_flags
cmd = [self.compiler, '-o', self.binadd_bin] + CC_FLAGS + [self.binadd_path, '-ladd']
self.logger.debug("Compile 'binadd' with: {}".format(" ".join(cmd)))
p = Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, _ = p.communicate()
self.logger.debug(stdout)
@property
def libadd(self):
return self.libadd_so
@property
def binadd(self):
return self.binadd_bin
@property
def directory(self):
return self.tmp_dir
def remove(self):
if os.path.isdir(self.directory):
shutil.rmtree(self.directory)
def __del__(self):
self.remove()
class TestDynamic(TestCase):
def setUp(self):
self.logger = logging.getLogger(__name__)
@unittest.skipUnless(sys.platform.startswith("linux"), "requires Linux")
def test_remove_library(self):
sample = LibAddSample()
libadd = lief.parse(sample.libadd)
binadd = lief.parse(sample.binadd)
libadd_needed = binadd.get_library("libadd.so")
binadd -= libadd_needed
self.assertFalse(binadd.has_library("libadd.so"))
@unittest.skipUnless(sys.platform.startswith("linux"), "requires Linux")
def test_remove_tag(self):
sample = LibAddSample()
libadd = lief.parse(sample.libadd)
binadd = lief.parse(sample.binadd)
self.logger.debug("BEFORE")
list(map(lambda e : self.logger.debug(e), binadd.dynamic_entries))
self.logger.debug("")
binadd -= lief.ELF.DYNAMIC_TAGS.NEEDED
self.logger.debug("AFTER")
list(map(lambda e : self.logger.debug(e), binadd.dynamic_entries))
self.logger.debug("")
self.assertTrue(all(e.tag != lief.ELF.DYNAMIC_TAGS.NEEDED for e in binadd.dynamic_entries))
@unittest.skipUnless(sys.platform.startswith("linux"), "requires Linux")
def test_runpath_api(self):
sample = LibAddSample()
libadd = lief.parse(sample.libadd)
binadd = lief.parse(sample.binadd)
rpath = lief.ELF.DynamicEntryRunPath()
rpath = binadd.add(rpath)
self.logger.debug(rpath)
rpath += "/tmp"
self.logger.debug(rpath)
self.assertEqual(rpath.paths, ["/tmp"])
self.assertEqual(rpath.runpath, "/tmp")
rpath.insert(0, "/foo")
self.assertEqual(rpath.paths, ["/foo", "/tmp"])
self.assertEqual(rpath.runpath, "/foo:/tmp")
rpath.paths = ["/foo", "/tmp", "/bar"]
self.logger.debug(rpath)
self.assertEqual(rpath.paths, ["/foo", "/tmp", "/bar"])
self.assertEqual(rpath.runpath, "/foo:/tmp:/bar")
rpath -= "/tmp"
self.logger.debug(rpath)
self.assertEqual(rpath.runpath, "/foo:/bar")
rpath.remove("/foo").remove("/bar")
self.logger.debug(rpath)
self.assertEqual(rpath.runpath, "")
self.logger.debug(rpath)
@unittest.skipUnless(sys.platform.startswith("linux"), "requires Linux")
def test_change_libname(self):
sample = LibAddSample()
libadd = lief.parse(sample.libadd)
binadd = lief.parse(sample.binadd)
new_name = "libwhichhasalongverylongname.so"
self.assertIn(lief.ELF.DYNAMIC_TAGS.SONAME, libadd)
so_name = libadd[lief.ELF.DYNAMIC_TAGS.SONAME]
self.logger.debug("DT_SONAME: {}".format(so_name.name))
so_name.name = new_name
libfoo_path = os.path.join(sample.directory, new_name)
self.logger.debug(libfoo_path)
libadd.write(libfoo_path)
libfoo = lief.parse(libfoo_path)
new_so_name = libadd[lief.ELF.DYNAMIC_TAGS.SONAME]
# Check builder did the job right
self.assertEqual(new_so_name.name, new_name)
libadd_needed = binadd.get_library("libadd.so")
libadd_needed.name = new_name
# Add a RPATH entry
rpath = lief.ELF.DynamicEntryRunPath(sample.directory)
rpath = binadd.add(rpath)
self.logger.debug(rpath)
new_binadd_path = os.path.join(sample.directory, "binadd_updated.bin")
self.logger.debug(new_binadd_path)
binadd.write(new_binadd_path)
# Remove original binaries:
os.remove(sample.libadd)
os.remove(sample.binadd)
# Run the new executable
st = os.stat(libfoo_path)
os.chmod(libfoo_path, st.st_mode | stat.S_IEXEC)
st = os.stat(new_binadd_path)
os.chmod(new_binadd_path, st.st_mode | stat.S_IEXEC)
p = Popen([new_binadd_path, '1', '2'],
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
#env={"LD_LIBRARY_PATH": sample.directory}) # Shouldn't be needed if RPATH inject succeed
stdout, _ = p.communicate()
if p.returncode > 0:
self.logger.fatal(stdout.decode("utf8"))
self.assertEqual(p.returncode, 0)
self.logger.debug(stdout.decode("utf8"))
self.assertIsNotNone(re.search(r'From myLIb, a \+ b = 3', stdout.decode("utf8")))
sample.remove()
if __name__ == '__main__':
root_logger = logging.getLogger()
root_logger.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
root_logger.addHandler(ch)
unittest.main(verbosity=2)
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