;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu services networking)
  #:use-module (gnu services)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages linux)
  #:use-module (guix gexp)
  #:use-module (guix monads)
  #:export (static-networking-service))

;;; Commentary:
;;;
;;; Networking services.
;;;
;;; Code:

(define* (static-networking-service interface ip
                                    #:key
                                    gateway
                                    (name-servers '())
                                    (inetutils inetutils)
                                    (net-tools net-tools))
  "Return a service that starts @var{interface} with address @var{ip}.  If
@var{gateway} is true, it must be a string specifying the default network
gateway."

  ;; TODO: Eventually we should do this using Guile's networking procedures,
  ;; like 'configure-qemu-networking' does, but the patch that does this is
  ;; not yet in stock Guile.
  (with-monad %store-monad
    (return
     (service
      (documentation
       (string-append "Set up networking on the '" interface
                      "' interface using a static IP address."))
      (provision '(networking))
      (start #~(lambda _
                 ;; Return #t if successfully started.
                 (and (zero? (system* (string-append #$inetutils
                                                     "/bin/ifconfig")
                                      #$interface #$ip "up"))
                      #$(if gateway
                            #~(zero? (system* (string-append #$net-tools
                                                             "/sbin/route")
                                              "add" "-net" "default"
                                              "gw" #$gateway))
                            #t)
                      #$(if (pair? name-servers)
                            #~(call-with-output-file "/etc/resolv.conf"
                                (lambda (port)
                                  (display
                                   "# Generated by 'static-networking-service'.\n"
                                   port)
                                  (for-each (lambda (server)
                                              (format port "nameserver ~a~%"
                                                      server))
                                            '#$name-servers)))
                            #t))))
      (stop #~(lambda _
                ;; Return #f is successfully stopped.
                (not (and (system* (string-append #$inetutils "/bin/ifconfig")
                                   #$interface "down")
                          (system* (string-append #$net-tools "/sbin/route")
                                   "del" "-net" "default")))))
      (respawn? #f)))))

;;; networking.scm ends here