ACF Libraries

ACF Libraries

Because of using lua, a very small language, the need arises to build everything from scratch. This can lead to some confusion, apprehension, or just feeling overwhelmed. Here is documentation on what we have now in the form of libraries and common functions. We hope to build some more and use this information to get the juices flowing in regard to ACF.

Some of these are lua libs or ones written for ACF. We are also using as a standard the lposix library which is documented here LPOSIX

apk.lua

Functions to load/unload apk packages

• get_all_packages
• get_loaded_packages
• get_available_packages
• delete_package
• install_package

authenticator-plaintext.lua

Authentication module

• authenticate
• get_userinfo
• get_userinfo_roles
• list_users
• list_roles
• change_setting
• change_settings
• new_settings
• delete_user

cfe.lua

cfe helper function

• cfe

controllerfunctions.lua

Controller helper functions

• handle_form
• handle_startstop

daemoncontrol.lua

Service start/stop/restart function

• daemoncontrol

date.lua

Date and time functions To be used with os.time() and os.date()

• date_to_seconds - Takes a date table and converts it to seconds from 1970
• seconds_to_date - Takes table of seconds values and converts to a date sorted smallest to largest
• string_to_table
• date_diff - Takes two values of seconds and gives back the difference
• num_month_name - Month number to name of month
• num_month_name_abr - Month number to abr of month
• name_month_num - Month name to number
• abr_month_num - Month abbreviation to number
• num_dow_name - Day of Week number to name
• num_dow_name_abr - Day of week number to abbreviation
• name_dow_num - Day of Week full name to number
• abr_dow_num - Day of week abbreviation to number
• what_tz - Checks to see what timezone the box is set to; /etc/TZ
• change_tz - Changes the timezone
  • Tables are included with this information
    • Timezones
    • Days of Week
    • Months of the Year

fs.lua

Used for various filesystem specific functions

• is_dir - test if the a directory
• is_file - test if is a file
• is_link - test if file is a link
• read_file / read_file_as_array - will read a file as a string / array
• write_file - replace contents of a file
• write_line_file - appends lines to a file
• find - Give a path and a filename and search for it
• md5sum_file - give a hash, md5sum of a file

format.lua

Used to format table,string,input,output ...

• dostounix - converts dos line endings to unix
• remove_blanks_comments - takes out the blank and commented lines
• search_replace - will go through a file or table and search and replace
• search_for_lines - will go through a file and return a table with matches
• cap_begin_word - will capitalize beginning of words
• ipairs_to_string
• table_to_string - formally the join.lua takes a table and makes into a string with delimiter
• string_to_table - formally split.lua. takes a delimited string and turns it into a table
• md5sum_string

fs.lua

File system functions

• is_dir
• is_file
• is_link
• read_file
• read_file_as_array
• write_file
• write_line_file
• md5sum_file
• md5sum_string
• find
• stat

getopts.lua

Functions to parse config files

• opts_to_table
• table_to_opts
• setoptsinfile
• getoptsfromfile

html.lua

Functions used by web_elements.lua. Written by nangel for ACF.

• cookie.set -creates a cookie to be used with ACF
• cookie.unset
• html_escape - will escape html encoded strings
• nv_pair - returns name value pairings as string
• entity
• link
• cfe_unpack - returns the whole of a cfe as a string. Great for troubleshooting.
• Form setup functions - also are the "types" of cfe. See ACF_core_principles
  • form.text
  • form.longtext
  • form.password
  • form.hidden
  • form.submit
  • form.action
  • form.file
  • form.image
  • form.select
  • form.checkbox
  • form.start
  • form.stop

ipcalc.lua

• iptoint
• nettoint
• same_subnet

menubuilder.lua

Written by nangel for ACF

• get_menuitems

modelfunctions.lua

• getenabled
• startstop_service
• getstatus
• getfiledetails
• validateselect
• validatemulti

privsep.lua

drop_privs

Drop privileges while allowing a few functions still have root permissions.

privsep.drop_privs(user, group, functable)

Depends on posix and json.

INPUT:

• user
• group
• functable
  • a table of functions that will run as root

OUTPUT: returns a table identical to functable, except the funcs are wrapped and runs in a separate process with root permissions.

CODING EXAMPLE:

#!/usr/bin/env lua

require "posix" 
require "privsep"

-- register those as privileged funcs 
a = {}
function a.getuid()
        return posix.getpid().euid
end

-- main ---------------------------------------------------------
priv = privsep.drop_privs("nobody", "nogroup", a)
if priv == nil then
        error("failed to drop privileges")
end

print("current uid:", posix.getpid().euid)
print("privileged uid:", priv.getuid())

processinfo.lua

• package_version
• process_botsequence

procps.lua

pidof

find the process ID of a running program

pidof.pidof(program)

INPUT

• program

OUTPUT returns the PID's of running program or nil if there are none.

CODING EXAMPLE

require "pidof"
if pidof.pidof("mini_httpd") ~= nil then
  print("mini_httpd is running")
else
  print("mini_httpd is not running")
end

roles.lua

• list_controllers
• get_controllers
• get_controllers_func
• list_default_roles
• list_roles
• list_all_roles
• get_roles_perm
• get_role_perm
• delete_role
• set_role_perm

session.lua

Written by nangel for ACF.

• random_hash - will create a bash64-like hash from /dev/urandom
• hash_ip_addr - create a hash encoded ip address
• ip_addr_from_hash - take the hash encoded ip and give me the ip
• serialize - go through a table or set of tables and serialize
• save_session - save the session table
• load_session - load a saved session table
• unlink_session - delete a saved session table
• record_event - record an invalid login attempt
• count_events - check if there are too many invalid attempts
• expired_events - delete the expired invalid attempts and saved sessions

validator.lua

This contains multiple different functions that each will validate input in there own way.

• is_string
• is_boolean
• is_number
• is_ipv4 - test if this is a valid ipv4 address
• is_partial_ipv4
• is_mac - test to see if this is a valid mac address
• is_integer - is the number and int
• is_integer_in_range - is the int in the range of numbers
• is_port - the the number in the ip port range
• is_valid_filename

viewfunctions.lua

displayinfo displaymanagement

• displayitem
• displayformitem
• displayform
• displaycommandresults

web_elements.lua

Written by nangel for ACF.

• render_table -walks through a table rendered for a template
• render_mainmenu - will render the side menu
• render_submenu - will render all the sub menu items