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#!/usr/bin/env python3
# (c) Zygmunt Krynicki 2005,
# Licensed under GPL, see COPYING for the whole text
from __future__ import print_function
import os
import os.path
import sys
import re
import logging
import DebPackage
try:
from urllib.parse import unquote
except ImportError:
from urllib import unquote
import apt
import apt_pkg
from string import Template
class PackageInfo(object):
def __init__(self, name, arch, repo, executables):
self.name = name
self.arch = arch
self.repo = repo
self.executables = set(executables)
def __str__(self):
return "%s|%s|%s|%s" % (self.arch, self.repo, self.name, ",".join(self.executables))
def display(self):
print("Package: %s for arch %s in repo %s" % (self.name, self.arch, self.repo))
print("Executables: ", self.executables)
def strip_comment(line):
i = line.find('#')
if i == -1:
return line
else:
return line[:i]
def get_alternatives(package):
"""
Attempts to extract alternatives registerd by a package.
NOTE: This code is a big HACK since we don't really understand or execute
postinst shell scripts here. Some alternatives are not retrieved.
"""
contents = package.getControlFile("postinst")
shell_vars = dict()
values_of_i = None
name_of_i = None
def expand_values(*text_list):
logging.debug("About to perform substitution on %s using %s and %s (for i-list)" % (text_list, shell_vars, values_of_i))
if values_of_i is None:
yield tuple([Template(text).safe_substitute(**shell_vars) for text in text_list])
else:
for i in values_of_i:
shell_vars[name_of_i] = i
yield tuple([Template(text).safe_substitute(**shell_vars) for text in text_list])
def one_element_tuple_to_value(it):
for item in it:
if len(item) == 1:
yield item[0]
else:
yield item
def nice_expand(*text_list):
return set(one_element_tuple_to_value(expand_values(*text_list)))
if contents != None:
for line in contents.decode(errors='replace').replace("\\\n","").splitlines():
line = strip_comment(line).strip()
if line == "":
continue
words = line.split()
# this ugly hack is capable of detecting both
# variable=value as well as variable="list of values"
if '=' in words[0] and "==" not in words[0]:
name = words[0][:words[0].index('=')]
value = line[line.index('=')+1:].strip('\'"')
shell_vars[name] = value
logging.debug("Based on line: %s" % line)
logging.debug("Variable binding established: %s=%s" % (name, value))
# this ugly hack is capable of detecting
# for something in a list of values; do ...
elif len(words) > 3 and words[0] == 'for' and words[2] == 'in' and ';' in line:
name_of_i = words[1]
values_of_i = " ".join(nice_expand (line[len('for %s in' % name_of_i):line.index(';')])).split()
logging.debug("Based on line: %s" % line)
logging.debug("Iterable variable binding established %s=%s" % (name_of_i, values_of_i))
# this ugly hack is capable of detecting
# for something in a list of values\n
elif len(words) > 3 and words[0] == 'for' and words[2] == 'in' and ';' not in line:
name_of_i = words[1]
values_of_i = " ".join(nice_expand(" ".join(words[3:]))).split()
logging.debug("Based on line: %s" % line)
logging.debug("Iterable variable binding established %s=%s" % (name_of_i, values_of_i))
else:
if words[0] == "update-alternatives":
words = words[1:]
while len(words) > 0:
if words[0] == "--install":
name = words[1]
target = words[3]
words = words[5:]
elif words[0] == "--slave":
name = words[1]
target = words[3]
words = words[4:]
# all remaining options are ignored
elif words[0] in ("--set", "--remove"):
words = words[3:]
continue
elif words[0] in ("--verbose", "--quiet", "--test", "--help", "--all"):
words = words[1:]
continue
elif words[0] in ("--altdir", "--admindir", "--list", "--display", "--auto", "--config", "--remove-all"):
words = words[2:]
continue
# sometimes || true or redirection follows the last argument
elif words[0] in (";", "||") or words[0].startswith(">"):
break
else:
logging.error("%s: aborting analisys of update-alternatives on argument '%s', line: %s" % (
package.filename, words[0], line))
break
# sometimes pathnames are quoted
name = name.strip('\'"')
target = target.strip('\'"')
for new_name, new_target in nice_expand(name, target):
if not new_name.startswith('/'):
new_name = "/" + new_name
if not new_target.startswith('/'):
new_target = "/" + new_target
if '$' in new_name or '$' in new_target:
logging.error("%s: FIXME alternatives need manual analisys: %s -> %s" % (
package.filename, new_name, new_target))
else:
yield new_name, new_target
def get_symlinks(package):
def symlink_filter(item_info):
return isinstance (item_info, DebPackage.SymbolicLinkInfo)
return [("/"+item_info.name, item_info.target) for item_info in package.items if symlink_filter(item_info)]
def get_executables(package):
def exec_filter(item_info):
# lib*.so* are usualy +x so we'll exclude them
return isinstance(item_info, DebPackage.FileInfo) and item_info.is_executable() and not re.match("^lib.*\\.so.*", os.path.basename(item_info.name))
return ["/"+item_info.name for item_info in package.items if exec_filter(item_info)]
def get_symlinks_to_executables(symlinks, executables):
for name, target in symlinks:
if target in executables:
yield name
def normalize_symlinks(symlinks):
for name, target in symlinks:
if not target.startswith("/"):
target = os.path.join(os.path.dirname(name), target)
target = os.path.normpath(target)
yield name, target
def get_repo(package):
parts = package.filename.split(os.path.sep)
try:
return parts[parts.index("pool")+1]
except ValueError:
logging.error("Unable to determine repository of package %s" % package.filename)
return None
def analyze_package(filename):
try:
package = DebPackage.load(filename)
except Exception as ex:
logging.error("Unable to process package %s: %s" % (filename, ex))
return None
logging.info("PACKAGE: %s" % package.filename)
repo = get_repo(package)
executables = get_executables(package)
logging.debug("EXECUTABLES:")
for executable in executables:
logging.debug("\t%s" % executable)
symlinks = list()
symlinks.extend(get_symlinks(package))
symlinks.extend(get_alternatives(package))
logging.debug("SYMLINKS:")
for name, target in symlinks:
logging.debug("\t%s -> %s" % (name, target))
symlinks = list(normalize_symlinks(symlinks))
logging.debug("NORMALIZED SYMLINKS:")
for name, target in symlinks:
logging.debug("\t%s -> %s" % (name, target))
executables.extend(get_symlinks_to_executables(symlinks, executables))
logging.debug("FINAL LIST OF EXECUTABLES:")
for executable in executables:
logging.debug("\t%s" % executable)
executables = [item for item in executables if item.startswith('/usr/bin') or item.startswith('/usr/sbin') or item.startswith('/bin') or item.startswith('/sbin') or item.startswith('/usr/games')]
if len(executables) == 0:
return None
return PackageInfo(package.name, package.arch, repo, executables)
def verify_package(filename):
" check if the given pkg is our arch/our distribution "
global arch
m = re.match("(.*)_(.*)_(.*).deb", filename)
pkgname = m.group(1)
ver = m.group(2)
# fix the quoting
ver = unquote(ver)
pkgarch = m.group(3)
# check arch
if pkgarch != "all" and arch != pkgarch:
return False
# check distro
candVer = "xxx"
if pkgname in cache:
candVer = getattr(cache[pkgname].candidate, "version", None)
# strip the epoch
if candVer and ":" in candVer:
candVer = candVer.split(":")[1]
if candVer != ver:
logging.debug("Skipping because '%s' (%s) it's not in our distro release" % (ver, pkgname))
return False
return True
def dir_walk(output, dirname, names):
#logging.debug("Entering dir: '%s' " % dirname)
for filename in names:
if filename.endswith(".deb") and verify_package(filename):
package_info = analyze_package(os.path.join(dirname, filename))
if package_info is None:
continue
#package_info.display()
print(package_info, file=output)
def scan(dir_path, output):
for dirpath, dirnames, filenames in os.walk(dir_path):
dir_walk(output, dirpath, filenames)
if __name__ == "__main__":
global arch, cache
# init logging
logging.basicConfig(level=logging.DEBUG,
filename="scan.log",
format='%(levelname)s %(message)s',
filemode='w')
# init output
filename="scan.data"
with open(filename, "w") as out:
for arch in ["i386","amd64","powerpc"]:
# init arch specific cache
apt_pkg.config.set("APT::Architecture",arch)
apt_pkg.config.set("Dir::state","./apt/")
apt_pkg.config.set("Dir::Etc","./apt")
cache = apt.Cache(apt.progress.base.OpProgress())
prog = apt.progress.base.AcquireProgress()
cache.update(prog)
cache.open(apt.progress.base.OpProgress())
# now do the scan for this arch
if len(sys.argv) == 2:
scan(sys.argv[1],out)
else:
scan("mirror/archive.ubuntu.com/pool", out)
#scan("mirror/archive.ubuntu.com/pool/main/a")
#scan("mirror/archive.ubuntu.com/pool/universe/c/command-not-found")
#scan("mirror/archive.ubuntu.com/pool/main/g/gksu")
#scan("mirror/archive.ubuntu.com/pool/main/v")
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