cronjob to check for processes still using old (deleted) versions of dynamic libraries

deleted_libraries.py

#!/usr/bin/python
# Copyright 2012 Daniel Richman

import os
import os.path
import pwd
import traceback

def proc_maps():
    for subdir in os.listdir("/proc"):
        try:
            assert subdir == str(int(subdir))
            yield subdir, os.path.join("/proc", subdir, "maps")
        except:
            pass # not a pid

_username_cache = {}

def username(uid):
    global _username_cache
    if uid not in _username_cache:
        _username_cache[uid] = pwd.getpwuid(uid).pw_name
    return _username_cache[uid]

def proc_info(pid):
    with open(os.path.join("/proc", pid, "status")) as f:
        for line in f:
            line = line.split()
            if line[0] == "Name:":
                name = ' '.join(line[1:])
                if len(line) != 2:
                    name = '(?)' + name
            elif line[0] == "Uid:":
                real_uid = int(line[2])
                user = username(real_uid)
    return (name, user)

def parse_maps(map_name):
    deleted = set()

    with open(map_name) as f:
        for line in f:
            parts = line.split()
            if parts[-1] == "(deleted)":
                filename = ' '.join(parts[5:-1])
                if len(parts) != 7:
                    filename = '(?)' + name
                for m in [".so", "/bin/", "/sbin/", "/lib"]:
                    if m in filename:
                        deleted.add(os.path.basename(filename))
                        break

    return list(deleted)

def main():
    header = False
    err_pids = []

    for (p, m) in proc_maps():
        try:
            fl = ' '.join(parse_maps(m))
            if fl:
                (name, username) = proc_info(p)
                if not header:
                    print "The following bins/libs are out of date"
                    header = True
                print name, username, fl
        except:
            err_pids.append(p)

    if err_pids:
        print "Couldn't inspect", len(err_pids), "processes"

if __name__ == "__main__":
    main()