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;;; 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 system shadow)
#:use-module (gnu packages admin)
#:use-module (gnu packages linux)
#:use-module (gnu packages tor)
#:use-module (guix gexp)
#:use-module (guix monads)
#:export (static-networking-service
dhcp-client-service
tor-service))
;;; Commentary:
;;;
;;; Networking services.
;;;
;;; Code:
(define* (static-networking-service interface ip
#:key
gateway
(provision '(networking))
(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
;; Unless we're providing the loopback interface, wait for udev to be up
;; and running so that INTERFACE is actually usable.
(requirement (if (memq 'loopback provision)
'()
'(udev)))
(documentation
"Bring up the networking interface using a static IP address.")
(provision provision)
(start #~(lambda _
;; Return #t if successfully started.
(and (zero? (system* (string-append #$inetutils
"/bin/ifconfig")
"-i" #$interface "-A" #$ip
"-i" #$interface "--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")
#$interface "down")
#$(if gateway
#~(system* (string-append #$net-tools
"/sbin/route")
"del" "-net" "default")
#t)))))
(respawn? #f)))))
(define* (dhcp-client-service #:key (dhcp isc-dhcp))
"Return a service that runs @var{dhcp}, a Dynamic Host Configuration
Protocol (DHCP) client, on all the non-loopback network interfaces."
(define dhclient
#~(string-append #$dhcp "/sbin/dhclient"))
(define pid-file
"/var/run/dhclient.pid")
(with-monad %store-monad
(return (service
(documentation "Set up networking via DHCP.")
(requirement '(user-processes udev))
;; XXX: Running with '-nw' ("no wait") avoids blocking for a
;; minute when networking is unavailable, but also means that the
;; interface is not up yet when 'start' completes. To wait for
;; the interface to be ready, one should instead monitor udev
;; events.
(provision '(networking))
(start #~(lambda _
;; When invoked without any arguments, 'dhclient'
;; discovers all non-loopback interfaces *that are
;; up*. However, the relevant interfaces are
;; typically down at this point. Thus we perform our
;; own interface discovery here.
(let* ((valid? (negate loopback-network-interface?))
(ifaces (filter valid?
(all-network-interfaces)))
(pid (fork+exec-command
(cons* #$dhclient "-nw"
"-pf" #$pid-file
ifaces))))
(and (zero? (cdr (waitpid pid)))
(call-with-input-file #$pid-file read)))))
(stop #~(make-kill-destructor))))))
(define* (tor-service #:key (tor tor))
"Return a service to run the @uref{https://torproject.org,Tor} daemon.
The daemon runs with the default settings (in particular the default exit
policy) as the @code{tor} unprivileged user."
(mlet %store-monad ((torrc (text-file "torrc" "User tor\n")))
(return
(service
(provision '(tor))
;; Tor needs at least one network interface to be up, hence the
;; dependency on 'loopback'.
(requirement '(user-processes loopback))
(start #~(make-forkexec-constructor
(list (string-append #$tor "/bin/tor") "-f" #$torrc)))
(stop #~(make-kill-destructor))
(user-groups (list (user-group
(name "tor")
(system? #t))))
(user-accounts (list (user-account
(name "tor")
(group "tor")
(system? #t)
(comment "Tor daemon user")
(home-directory "/var/empty")
(shell
"/run/current-system/profile/sbin/nologin"))))
(documentation "Run the Tor anonymous network overlay.")))))
;;; networking.scm ends here
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