Module: RailsPwnerer::Util

Extended by:
Base
Defined in:
lib/rails_pwnerer/util/main.rb,
lib/rails_pwnerer/util/kill_process_set.rb

Class Method Summary collapse

Methods included from Base

_setup_unix, _setup_windows, all_packages, all_packages_without_caching, atomic_erase, atomic_read, atomic_write, best_package_matching, check_rails_root, control_boot_script, cpu_cores, current_user, gem_exists?, gid_for_username, group_for_username, hook_boot_script, install_gem, install_gems, install_package, install_package_impl, install_package_matching, install_packages, kill_tree, os_distro, package_info_hash, path_to_boot_script, path_to_boot_script_defaults, path_to_gemdir, process_info, prompt_user_for_password, remove_package, remove_packages, search_packages, uid_for_username, unroll_collection, update_all_packages, update_all_packages_impl, update_gems, update_package_metadata, upgrade_gem, upgrade_gems, upgrade_package, upgrade_package_impl, upgrade_packages, with_package_source, with_temp_dir

Class Method Details

.kill_process_set(kill_script, pid_patterns, process_patterns, options = {}) ⇒ Object

Complex procedure for killing a process or a bunch of process replicas kill_command is the script that’s supposed to kill the process / processes (tried first) pid_patters are globs identifying PID files (a file can match any of the patterns) process_patterns are strings that should show on a command line (a process must match all)

options:

:verbose - display what gets killed
:script_delay - the amount of seconds to sleep after launching the kill script
:force_script - the kill script is executed even if there are no PID files



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# File 'lib/rails_pwnerer/util/kill_process_set.rb', line 12

def self.kill_process_set(kill_script, pid_patterns, process_patterns, options = {})
  # Phase 1: kill order (only if there's a PID file)
  pid_patterns = [pid_patterns] unless pid_patterns.kind_of? Enumerable
  unless options[:force_script]
    pid_files = pid_patterns.map { |pattern| Dir.glob(pattern) }.flatten
  end
  if options[:force_script] or !(pid_files.empty? or kill_script.nil?)
    print "Issuing kill order: #{kill_script}\n" if options[:verbose]
    success = Kernel.system kill_script unless kill_script.nil?
    if !success and options[:verbose]
      print "Kill order failed with exit code #{$CHILD_STATUS.exitstatus}\n"
    end
    
    deadline_time = Time.now + (options[:script_delay] || 0.5)
    while Time.now < deadline_time
      pid_files = pid_patterns.map { |pattern| Dir.glob(pattern) }.flatten
      break if pid_files.empty?
      sleep 0.05
    end
  end
  
  # Phase 2: look through PID files and issue kill orders
  pinfo = process_info()
  pid_files = pid_patterns.map { |pattern| Dir.glob(pattern) }.flatten 
  pid_files.each do |fname|
    begin
      pid = File.open(fname, 'r') { |f| f.read.strip! }
      process_cmdline = pinfo[pid][:cmdline]
      # avoid killing innocent victims
      if pinfo[pid].nil? or process_patterns.all? { |pattern| process_cmdline.index pattern } 
        print "Killing #{pid}: #{process_cmdline}\n" if options[:verbose]
        kill_tree pid.to_i
      end
    rescue
      # just in case the file gets wiped before we see it
    end
    begin
      print "Deleting #{fname}\n" if options[:verbose]
      File.delete fname if File.exists? fname
    rescue
      # prevents crashing if the file is wiped after we call exists?
    end
  end
  
  # Phase 3: look through the process table and kill anything that looks good
  pinfo = process_info()
  pinfo.each do |pid, info|
    next unless process_patterns.all? { |pattern| info[:cmdline].index pattern }
    print "Killing #{pid}: #{pinfo[pid][:cmdline]}\n" if options[:verbose]
    kill_tree pid.to_i
  end
end