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;;; nm.el --- Simple NetworkManager integration through D-Bus. -*- lexical-binding: t; -*-
;; -*- coding: utf-8 -*-
;; Author: Øyvind Stegard <oyvind.stegard@ifi.uio.no>
;; License: Public domain, use at own risk, no warranties of any kind.
;; Requires Emacs23 with D-Bus bindings and preferably a running NetworkManager
;; instance.
;;
;; You will need to call the function `nm-enable' for things to start happening.
;; Functions you would like to run when network is connected:
;; (add-hook 'nm-connected-hook 'ping-skynet)
;;
;; Functions you would like to run when network is disconnected:
;; (add-hook 'nm-disconnected-hook (lambda() (message "Darnit, we are down.")))
(require 'dbus)
(defvar nm-connected-hook nil
"A hook variable which runs when network is connected.")
(defvar nm-disconnected-hook nil
"A hook variable which runs when network is disconnected.")
(defun nm-service-p()
"Checks whether NetworkManager service is available on system bus."
(member "org.freedesktop.NetworkManager" (dbus-list-known-names :system)))
(defun nm-connected-p()
"Returns nil if NetworkManager service indicates that network is down, t otherwise. "
(and
(nm-service-p)
(equal 70
(dbus-get-property :system
"org.freedesktop.NetworkManager"
"/org/freedesktop/NetworkManager"
"org.freedesktop.NetworkManager" "State"))))
(defvar nm-dbus-registration nil
"Record if registered with NM.")
(defun nm-enable()
"Enable integration with NetworkManager. Does nothing if
already enabled or service is not available."
(interactive)
(cl-declare (special nm-dbus-registration))
(cond
((not (nm-service-p))
(message "NetworkManager service not available.") nil)
((not nm-dbus-registration)
(setq nm-dbus-registration
(dbus-register-signal
:system
"org.freedesktop.NetworkManager" "/org/freedesktop/NetworkManager"
"org.freedesktop.NetworkManager" "StateChanged"
'nm-state-dbus-signal-handler))
(message "Enabled integration with NetworkManager."))
((message "Integration with NetworkManager already enabled."))))
(defun nm-disable()
"Disable integration with NetworkManager. Does nothing if already disabled."
(interactive)
(cl-declare (special nm-dbus-registration))
(when nm-dbus-registration
(dbus-unregister-object nm-dbus-registration)
(setq nm-dbus-registration nil)
(message "Disabled integration with NetworkManager.")))
;; NM_STATE numbers and meanings:
;; NM_STATE_UNKNOWN = 0
;; Networking state is unknown.
;; NM_STATE_ASLEEP = 10
;; Networking is inactive and all devices are disabled.
;; NM_STATE_DISCONNECTED = 20
;; There is no active network connection.
;; NM_STATE_DISCONNECTING = 30
;; Network connections are being cleaned up.
;; NM_STATE_CONNECTING = 40
;; A network device is connecting to a network and there is no other available network connection.
;; NM_STATE_CONNECTED_LOCAL = 50
;; A network device is connected, but there is only link-local connectivity.
;; NM_STATE_CONNECTED_SITE = 60
;; A network device is connected, but there is only site-local connectivity.
;; NM_STATE_CONNECTED_GLOBAL = 70
;; A network device is connected, with global network connectivity.
;;
;; See:
;; https://developer.gnome.org/NetworkManager/unstable/spec.html#type-NM_STATE
(defun nm-state-dbus-signal-handler (nmstate)
"Handles NetworkManager signals and runs appropriate hooks."
(cond
((or (= 10 nmstate) (= 20 nmstate) (= 30 nmstate) (= 50 nmstate) (= 60 nmstate))
(run-hooks 'nm-disconnected-hook))
((= 70 nmstate)
(run-hooks 'nm-connected-hook))))
(provide 'nm)
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