code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017, 2018 Clément Lassieur <clement@lassieur.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2015, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Pierre-Antoine Rouby <contact@parouby.fr>
;;;
;;; 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 messaging)
  #:use-module (gnu packages messaging)
  #:use-module (gnu packages admin)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services configuration)
  #:use-module (gnu system shadow)
  #:use-module (guix gexp)
  #:use-module (guix modules)
  #:use-module (guix records)
  #:use-module (guix packages)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-35)
  #:use-module (ice-9 match)
  #:export (prosody-service-type
            prosody-configuration
            opaque-prosody-configuration

            virtualhost-configuration
            int-component-configuration
            ext-component-configuration

            mod-muc-configuration
            ssl-configuration

            %default-modules-enabled
            prosody-configuration-pidfile

            bitlbee-configuration
            bitlbee-configuration?
            bitlbee-service
            bitlbee-service-type))

;;; Commentary:
;;;
;;; Messaging services.
;;;
;;; Code:

(define-syntax define-all-configurations
  (lambda (stx)
    (define-syntax-rule (id ctx parts ...)
      "Assemble PARTS into a raw (unhygienic) identifier."
      (datum->syntax ctx (symbol-append (syntax->datum parts) ...)))
    (define (make-pred arg)
      (lambda (field target)
        (and (memq (syntax->datum target) `(common ,arg)) field)))
    (syntax-case stx ()
      ((_ stem (field (field-type def) doc target) ...)
       (with-syntax (((new-field-type ...)
                      (map (lambda (field-type target)
                             (if (and (eq? 'common (syntax->datum target))
                                      (not (string-prefix?
                                            "maybe-"
                                            (symbol->string
                                             (syntax->datum field-type)))))
                                 (id #'stem #'maybe- field-type) field-type))
                           #'(field-type ...) #'(target ...)))
                     ((new-def ...)
                      (map (lambda (def target)
                             (if (eq? 'common (syntax->datum target))
                                 #''disabled def))
                           #'(def ...) #'(target ...)))
                     ((new-doc ...)
                      (map (lambda (doc target)
                             (if (eq? 'common (syntax->datum target))
                                 "" doc))
                           #'(doc ...) #'(target ...))))
         #`(begin
             (define #,(id #'stem #'common-fields)
               '(#,@(filter-map (make-pred #f) #'(field ...) #'(target ...))))
             (define-configuration #,(id #'stem #'prosody-configuration)
               #,@(filter-map (make-pred 'global)
                              #'((field (field-type def) doc) ...)
                              #'(target ...)))
             (define-configuration #,(id #'stem #'virtualhost-configuration)
               #,@(filter-map (make-pred 'virtualhost)
                              #'((field (new-field-type new-def) new-doc) ...)
                              #'(target ...)))
             (define-configuration #,(id #'stem #'int-component-configuration)
               #,@(filter-map (make-pred 'int-component)
                              #'((field (new-field-type new-def) new-doc) ...)
                              #'(target ...)))
             (define-configuration #,(id #'stem #'ext-component-configuration)
               #,@(filter-map (make-pred 'ext-component)
                              #'((field (new-field-type new-def) new-doc) ...)
                              #'(target ...)))))))))

(define (uglify-field-name field-name)
  (let ((str (symbol->string field-name)))
    (string-join (string-split (if (string-suffix? "?" str)
                                   (substring str 0 (1- (string-length str)))
                                   str)
                               #\-)
                 "_")))

(define (serialize-field field-name val)
  #~(format #f "~a = ~a;\n" #$(uglify-field-name field-name) #$val))
(define (serialize-field-list field-name val)
  (serialize-field field-name #~(format #f "{\n~@{~a;\n~}}" #$@val)))

(define (serialize-boolean field-name val)
  (serialize-field field-name (if val "true" "false")))
(define-maybe boolean)

(define (string-or-boolean? val)
  (or (string? val) (boolean? val)))
(define (serialize-string-or-boolean field-name val)
  (if (string? val)
      (serialize-string field-name val)
      (serialize-boolean field-name val)))

(define (non-negative-integer? val)
  (and (exact-integer? val) (not (negative? val))))
(define (serialize-non-negative-integer field-name val)
  (serialize-field field-name (number->string val)))
(define-maybe non-negative-integer)

(define (non-negative-integer-list? val)
  (and (list? val) (and-map non-negative-integer? val)))
(define (serialize-non-negative-integer-list field-name val)
  (serialize-field-list field-name (map number->string val)))
(define-maybe non-negative-integer-list)

(define (enclose-quotes s)
  #~(string-append "\"" #$s "\""))
(define (serialize-string field-name val)
  (serialize-field field-name (enclose-quotes val)))
(define-maybe string)

(define (string-list? val)
  (and (list? val)
       (and-map (lambda (x)
                  (and (string? x) (not (string-index x #\,))))
                val)))
(define (serialize-string-list field-name val)
  (serialize-field-list field-name (map enclose-quotes val)))
(define-maybe string-list)

(define (module-list? val)
  (string-list? val))
(define (serialize-module-list field-name val)
  (serialize-string-list field-name val))
(define-maybe module-list)

(define (file-name? val)
  (and (string? val)
       (string-prefix? "/" val)))
(define (serialize-file-name field-name val)
  (serialize-string field-name val))
(define-maybe file-name)

(define (file-name-list? val)
  (and (list? val) (and-map file-name? val)))
(define (serialize-file-name-list field-name val)
  (serialize-string-list field-name val))
(define-maybe file-name)

(define (file-object? val)
  (or (file-like? val) (file-name? val)))
(define (serialize-file-object field-name val)
  (serialize-string field-name val))
(define-maybe file-object)

(define (file-object-list? val)
  (and (list? val) (and-map file-object? val)))
(define (serialize-file-object-list field-name val)
  (serialize-string-list field-name val))
(define-maybe file-object)

(define (raw-content? val)
  (not (eq? val 'disabled)))
(define (serialize-raw-content field-name val)
  val)
(define-maybe raw-content)

(define-configuration mod-muc-configuration
  (name
   (string "Prosody Chatrooms")
   "The name to return in service discovery responses.")

  (restrict-room-creation
   (string-or-boolean #f)
   "If @samp{#t}, this will only allow admins to create new chatrooms.
Otherwise anyone can create a room.  The value @samp{\"local\"} restricts room
creation to users on the service's parent domain.  E.g. @samp{user@@example.com}
can create rooms on @samp{rooms.example.com}.  The value @samp{\"admin\"}
restricts to service administrators only.")

  (max-history-messages
   (non-negative-integer 20)
   "Maximum number of history messages that will be sent to the member that has
just joined the room."))
(define (serialize-mod-muc-configuration field-name val)
  (serialize-configuration val mod-muc-configuration-fields))
(define-maybe mod-muc-configuration)

(define-configuration ssl-configuration
  (protocol
   (maybe-string 'disabled)
   "This determines what handshake to use.")

  (key
   (maybe-file-name 'disabled)
   "Path to your private key file.")

  (certificate
   (maybe-file-name 'disabled)
   "Path to your certificate file.")

  (capath
   (file-object "/etc/ssl/certs")
   "Path to directory containing root certificates that you wish Prosody to
trust when verifying the certificates of remote servers.")

  (cafile
   (maybe-file-object 'disabled)
   "Path to a file containing root certificates that you wish Prosody to trust.
Similar to @code{capath} but with all certificates concatenated together.")

  (verify
   (maybe-string-list 'disabled)
   "A list of verification options (these mostly map to OpenSSL's
@code{set_verify()} flags).")

  (options
   (maybe-string-list 'disabled)
   "A list of general options relating to SSL/TLS.  These map to OpenSSL's
@code{set_options()}.  For a full list of options available in LuaSec, see the
LuaSec source.")

  (depth
   (maybe-non-negative-integer 'disabled)
   "How long a chain of certificate authorities to check when looking for a
trusted root certificate.")

  (ciphers
   (maybe-string 'disabled)
   "An OpenSSL cipher string.  This selects what ciphers Prosody will offer to
clients, and in what order.")

  (dhparam
   (maybe-file-name 'disabled)
   "A path to a file containing parameters for Diffie-Hellman key exchange.  You
can create such a file with:
@code{openssl dhparam -out /etc/prosody/certs/dh-2048.pem 2048}")

  (curve
   (maybe-string 'disabled)
   "Curve for Elliptic curve Diffie-Hellman. Prosody's default is
@samp{\"secp384r1\"}.")

  (verifyext
   (maybe-string-list 'disabled)
   "A list of \"extra\" verification options.")

  (password
   (maybe-string 'disabled)
   "Password for encrypted private keys."))
(define (serialize-ssl-configuration field-name val)
  #~(format #f "ssl = {\n~a};\n"
            #$(serialize-configuration val ssl-configuration-fields)))
(define-maybe ssl-configuration)

(define %default-modules-enabled
  '("roster"
    "saslauth"
    "tls"
    "dialback"
    "disco"
    "carbons"
    "private"
    "blocklist"
    "vcard"
    "version"
    "uptime"
    "time"
    "ping"
    "pep"
    "register"
    "admin_adhoc"))

;; Guile bug.  Use begin wrapper, because otherwise virtualhost-configuration
;; is assumed to be a function.  See
;; https://www.gnu.org/software/guile/manual/html_node/R6RS-Incompatibilities.html
(begin
  (define (virtualhost-configuration-list? val)
    (and (list? val) (and-map virtualhost-configuration? val)))
  (define (serialize-virtualhost-configuration-list l)
    #~(string-append
       #$@(map (lambda (val)
                 (serialize-virtualhost-configuration val)) l)))

  (define (int-component-configuration-list? val)
    (and (list? val) (and-map int-component-configuration? val)))
  (define (serialize-int-component-configuration-list l)
    #~(string-append
       #$@(map (lambda (val)
                 (serialize-int-component-configuration val)) l)))

  (define (ext-component-configuration-list? val)
    (and (list? val) (and-map ext-component-configuration? val)))
  (define (serialize-ext-component-configuration-list l)
    #~(string-append
       #$@(map (lambda (val)
                 (serialize-ext-component-configuration val)) l)))

  (define-all-configurations prosody-configuration
    (prosody
     (package prosody)
     "The Prosody package."
     global)

    (data-path
     (file-name "/var/lib/prosody")
     "Location of the Prosody data storage directory.  See
@url{https://prosody.im/doc/configure}."
     global)

    (plugin-paths
     (file-object-list '())
     "Additional plugin directories.  They are searched in all the specified
paths in order.  See @url{https://prosody.im/doc/plugins_directory}."
     global)

    (certificates
     (file-name "/etc/prosody/certs")
     "Every virtual host and component needs a certificate so that clients and
servers can securely verify its identity.  Prosody will automatically load
certificates/keys from the directory specified here."
     global)

    (admins
     (string-list '())
     "This is a list of accounts that are admins for the server.  Note that you
must create the accounts separately.  See @url{https://prosody.im/doc/admins} and
@url{https://prosody.im/doc/creating_accounts}.
Example: @code{(admins '(\"user1@@example.com\" \"user2@@example.net\"))}"
     common)

    (use-libevent?
     (boolean #f)
     "Enable use of libevent for better performance under high load.  See
@url{https://prosody.im/doc/libevent}."
     common)

    (modules-enabled
     (module-list %default-modules-enabled)
     "This is the list of modules Prosody will load on startup.  It looks for
@code{mod_modulename.lua} in the plugins folder, so make sure that exists too.
Documentation on modules can be found at:
@url{https://prosody.im/doc/modules}."
     common)

    (modules-disabled
     (string-list '())
     "@samp{\"offline\"}, @samp{\"c2s\"} and @samp{\"s2s\"} are auto-loaded, but
should you want to disable them then add them to this list."
     common)

    (groups-file
     (file-object "/var/lib/prosody/sharedgroups.txt")
     "Path to a text file where the shared groups are defined.  If this path is
empty then @samp{mod_groups} does nothing.  See
@url{https://prosody.im/doc/modules/mod_groups}."
     common)

    (allow-registration?
     (boolean #f)
     "Disable account creation by default, for security.  See
@url{https://prosody.im/doc/creating_accounts}."
     common)

    (ssl
     (maybe-ssl-configuration (ssl-configuration))
     "These are the SSL/TLS-related settings.  Most of them are disabled so to
use Prosody's defaults.  If you do not completely understand these options, do
not add them to your config, it is easy to lower the security of your server
using them.  See @url{https://prosody.im/doc/advanced_ssl_config}."
     common)

    (c2s-require-encryption?
     (boolean #f)
     "Whether to force all client-to-server connections to be encrypted or not.
See @url{https://prosody.im/doc/modules/mod_tls}."
     common)

    (disable-sasl-mechanisms
     (string-list '("DIGEST-MD5"))
     "Set of mechanisms that will never be offered.  See
@url{https://prosody.im/doc/modules/mod_saslauth}."
     common)

    (s2s-require-encryption?
     (boolean #f)
     "Whether to force all server-to-server connections to be encrypted or not.
See @url{https://prosody.im/doc/modules/mod_tls}."
     common)

    (s2s-secure-auth?
     (boolean #f)
     "Whether to require encryption and certificate authentication.  This
provides ideal security, but requires servers you communicate with to support
encryption AND present valid, trusted certificates.  See
@url{https://prosody.im/doc/s2s#security}."
     common)

    (s2s-insecure-domains
     (string-list '())
     "Many servers don't support encryption or have invalid or self-signed
certificates.  You can list domains here that will not be required to
authenticate using certificates.  They will be authenticated using DNS.  See
@url{https://prosody.im/doc/s2s#security}."
     common)

    (s2s-secure-domains
     (string-list '())
     "Even if you leave @code{s2s-secure-auth?} disabled, you can still require
valid certificates for some domains by specifying a list here.  See
@url{https://prosody.im/doc/s2s#security}."
     common)

    (authentication
     (string "internal_plain")
     "Select the authentication backend to use.  The default provider stores
passwords in plaintext and uses Prosody's configured data storage to store the
authentication data.  If you do not trust your server please see
@url{https://prosody.im/doc/modules/mod_auth_internal_hashed} for information
about using the hashed backend.  See also
@url{https://prosody.im/doc/authentication}"
     common)

    ;; TODO: Handle more complicated log structures.
    (log
     (maybe-string "*syslog")
     "Set logging options.  Advanced logging configuration is not yet supported
by the GuixSD Prosody Service.  See @url{https://prosody.im/doc/logging}."
     common)

    (pidfile
     (file-name "/var/run/prosody/prosody.pid")
     "File to write pid in.  See @url{https://prosody.im/doc/modules/mod_posix}."
     global)

    (http-max-content-size
     (maybe-non-negative-integer 'disabled)
     "Maximum allowed size of the HTTP body (in bytes)."
     common)

    (http-external-url
     (maybe-string 'disabled)
     "Some modules expose their own URL in various ways.  This URL is built
from the protocol, host and port used.  If Prosody sits behind a proxy, the
public URL will be @code{http-external-url} instead.  See
@url{https://prosody.im/doc/http#external_url}."
     common)

    (virtualhosts
     (virtualhost-configuration-list
      (list (virtualhost-configuration
             (domain "localhost"))))
     "A host in Prosody is a domain on which user accounts can be created.  For
example if you want your users to have addresses like
@samp{\"john.smith@@example.com\"} then you need to add a host
@samp{\"example.com\"}.  All options in this list will apply only to this host.

Note: the name \"virtual\" host is used in configuration to avoid confusion with
the actual physical host that Prosody is installed on.  A single Prosody
instance can serve many domains, each one defined as a VirtualHost entry in
Prosody's configuration.  Conversely a server that hosts a single domain would
have just one VirtualHost entry.

See @url{https://prosody.im/doc/configure#virtual_host_settings}."
     global)

    (int-components
     (int-component-configuration-list '())
     "Components are extra services on a server which are available to clients,
usually on a subdomain of the main server (such as
@samp{\"mycomponent.example.com\"}).  Example components might be chatroom
servers, user directories, or gateways to other protocols.

Internal components are implemented with Prosody-specific plugins.  To add an
internal component, you simply fill the hostname field, and the plugin you wish
to use for the component.

See @url{https://prosody.im/doc/components}."
     global)

    (ext-components
     (ext-component-configuration-list '())
     "External components use XEP-0114, which most standalone components
support.  To add an external component, you simply fill the hostname field.  See
@url{https://prosody.im/doc/components}."
     global)

    (component-secret
     (string (configuration-missing-field 'ext-component 'component-secret))
     "Password which the component will use to log in."
     ext-component)

    (component-ports
     (non-negative-integer-list '(5347))
     "Port(s) Prosody listens on for component connections."
     global)

    (component-interface
     (string "127.0.0.1")
     "Interface Prosody listens on for component connections."
     global)

    (domain
     (string (configuration-missing-field 'virtualhost 'domain))
     "Domain you wish Prosody to serve."
     virtualhost)

    (hostname
     (string (configuration-missing-field 'int-component 'hostname))
     "Hostname of the component."
     int-component)

    (plugin
     (string (configuration-missing-field 'int-component 'plugin))
     "Plugin you wish to use for the component."
     int-component)

    (mod-muc
     (maybe-mod-muc-configuration 'disabled)
     "Multi-user chat (MUC) is Prosody's module for allowing you to create
hosted chatrooms/conferences for XMPP users.

General information on setting up and using multi-user chatrooms can be found
in the \"Chatrooms\" documentation (@url{https://prosody.im/doc/chatrooms}),
which you should read if you are new to XMPP chatrooms.

See also @url{https://prosody.im/doc/modules/mod_muc}."
     int-component)

    (hostname
     (string (configuration-missing-field 'ext-component 'hostname))
     "Hostname of the component."
     ext-component)

    (raw-content
     (maybe-raw-content 'disabled)
     "Raw content that will be added to the configuration file."
     common)))

;; Serialize Virtualhost line first.
(define (serialize-virtualhost-configuration config)
  (define (rest? field)
    (not (memq (configuration-field-name field)
               '(domain))))
  (let ((domain (virtualhost-configuration-domain config))
        (rest (filter rest? virtualhost-configuration-fields)))
    #~(string-append
       #$(format #f "VirtualHost \"~a\"\n" domain)
       #$(serialize-configuration config rest))))

;; Serialize Component line first.
(define (serialize-int-component-configuration config)
  (define (rest? field)
    (not (memq (configuration-field-name field)
               '(hostname plugin))))
  (let ((hostname (int-component-configuration-hostname config))
        (plugin (int-component-configuration-plugin config))
        (rest (filter rest? int-component-configuration-fields)))
    #~(string-append
       #$(format #f "Component \"~a\" \"~a\"\n" hostname plugin)
       #$(serialize-configuration config rest))))

;; Serialize Component line first.
(define (serialize-ext-component-configuration config)
  (define (rest? field)
    (not (memq (configuration-field-name field)
               '(hostname))))
  (let ((hostname (ext-component-configuration-hostname config))
        (rest (filter rest? ext-component-configuration-fields)))
    #~(string-append
       #$(format #f "Component \"~a\"\n" hostname)
       #$(serialize-configuration config rest))))

;; Serialize virtualhosts and components last.
(define (serialize-prosody-configuration config)
  (define (rest? field)
    (not (memq (configuration-field-name field)
               '(virtualhosts int-components ext-components))))
  #~(string-append
     #$(let ((rest (filter rest? prosody-configuration-fields)))
         (serialize-configuration config rest))
     #$(serialize-virtualhost-configuration-list
        (prosody-configuration-virtualhosts config))
     #$(serialize-int-component-configuration-list
        (prosody-configuration-int-components config))
     #$(serialize-ext-component-configuration-list
        (prosody-configuration-ext-components config))))

(define-configuration opaque-prosody-configuration
  (prosody
   (package prosody)
   "The prosody package.")

  (prosody.cfg.lua
   (string (configuration-missing-field 'opaque-prosody-configuration
                                        'prosody.cfg.lua))
   "The contents of the @code{prosody.cfg.lua} to use."))

(define (prosody-shepherd-service config)
  "Return a <shepherd-service> for Prosody with CONFIG."
  (let* ((prosody (if (opaque-prosody-configuration? config)
                      (opaque-prosody-configuration-prosody config)
                      (prosody-configuration-prosody config)))
         (prosodyctl-bin (file-append prosody "/bin/prosodyctl"))
         (pid-file (prosody-configuration-pidfile config))
         (prosodyctl-action (lambda args
                              #~(lambda _
                                  (invoke #$prosodyctl-bin #$@args)
                                  (match '#$args
                                    (("start")
                                     (call-with-input-file #$pid-file read))
                                    (_ #t))))))
    (list (shepherd-service
           (documentation "Run the Prosody XMPP server")
           (provision '(prosody xmpp-daemon))
           (requirement '(networking syslogd user-processes))
           (modules `((ice-9 match)
                      ,@%default-modules))
           (start (prosodyctl-action "start"))
           (stop (prosodyctl-action "stop"))))))

(define %prosody-accounts
  (list (user-group (name "prosody") (system? #t))
        (user-account
         (name "prosody")
         (group "prosody")
         (system? #t)
         (comment "Prosody daemon user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define (prosody-activation config)
  "Return the activation gexp for CONFIG."
  (let* ((config-dir "/etc/prosody")
         (default-certs-dir "/etc/prosody/certs")
         (data-path (prosody-configuration-data-path config))
         (pidfile-dir (dirname (prosody-configuration-pidfile config)))
         (config-str (if (opaque-prosody-configuration? config)
                         (opaque-prosody-configuration-prosody.cfg.lua config)
                         #~(begin
                             (use-modules (ice-9 format))
                             #$(serialize-prosody-configuration config))))
         (config-file (mixed-text-file "prosody.cfg.lua" config-str)))
    #~(begin
        (use-modules (guix build utils))
        (define %user (getpw "prosody"))

        (mkdir-p #$config-dir)
        (chown #$config-dir (passwd:uid %user) (passwd:gid %user))
        (copy-file #$config-file (string-append #$config-dir
                                                "/prosody.cfg.lua"))

        (mkdir-p #$default-certs-dir)
        (chown #$default-certs-dir (passwd:uid %user) (passwd:gid %user))
        (chmod #$default-certs-dir #o750)

        (mkdir-p #$data-path)
        (chown #$data-path (passwd:uid %user) (passwd:gid %user))
        (chmod #$data-path #o750)

        (mkdir-p #$pidfile-dir)
        (chown #$pidfile-dir (passwd:uid %user) (passwd:gid %user)))))

(define prosody-service-type
  (service-type (name 'prosody)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          prosody-shepherd-service)
                       (service-extension account-service-type
                                          (const %prosody-accounts))
                       (service-extension activation-service-type
                                          prosody-activation)))
                (default-value (prosody-configuration
                                (virtualhosts
                                 (list
                                  (virtualhost-configuration
                                   (domain "localhost"))))))
                (description
                 "Run Prosody, a modern XMPP communication server.")))

;; A little helper to make it easier to document all those fields.
(define (generate-documentation)
  (define documentation
    `((prosody-configuration
       ,prosody-configuration-fields
       (ssl ssl-configuration)
       (virtualhosts virtualhost-configuration)
       (int-components int-component-configuration)
       (ext-components ext-component-configuration))
      (ssl-configuration ,ssl-configuration-fields)
      (int-component-configuration ,int-component-configuration-fields
                                   (mod-muc mod-muc-configuration))
      (ext-component-configuration ,ext-component-configuration-fields)
      (mod-muc-configuration ,mod-muc-configuration-fields)
      (virtualhost-configuration ,virtualhost-configuration-fields)
      (opaque-prosody-configuration ,opaque-prosody-configuration-fields)))
  (define (generate configuration-name)
    (match (assq-ref documentation configuration-name)
      ((fields . sub-documentation)
       (format #t "\nAvailable @code{~a} fields are:\n\n" configuration-name)
       (when (memq configuration-name
                   '(virtualhost-configuration
                     int-component-configuration
                     ext-component-configuration))
         (format #t "all these @code{prosody-configuration} fields: ~a, plus:\n"
                 (string-join (map (lambda (s)
                                     (format #f "@code{~a}" s)) common-fields)
                              ", ")))
       (for-each
        (lambda (f)
          (let ((field-name (configuration-field-name f))
                (field-type (configuration-field-type f))
                (field-docs (string-trim-both
                             (configuration-field-documentation f)))
                (default (catch #t
                           (configuration-field-default-value-thunk f)
                           (lambda _ 'nope))))
            (define (escape-chars str chars escape)
              (with-output-to-string
                (lambda ()
                  (string-for-each (lambda (c)
                                     (when (char-set-contains? chars c)
                                       (display escape))
                                     (display c))
                                   str))))
            (define (show-default? val)
              (or (string? val) (number? val) (boolean? val)
                  (and (list? val) (and-map show-default? val))))
            (format #t "@deftypevr {@code{~a} parameter} ~a ~a\n~a\n"
                    configuration-name field-type field-name field-docs)
            (when (show-default? default)
              (format #t "Defaults to @samp{~a}.\n"
                      (escape-chars (format #f "~s" default)
                                    (char-set #\@ #\{ #\})
                                    #\@)))
            (for-each generate (or (assq-ref sub-documentation field-name) '()))
            (format #t "@end deftypevr\n\n")))
        (filter (lambda (f)
                  (not (string=? "" (configuration-field-documentation f))))
                fields)))))
  (generate 'prosody-configuration)
  (format #t "It could be that you just want to get a @code{prosody.cfg.lua}
up and running.  In that case, you can pass an
@code{opaque-prosody-configuration} record as the value of
@code{prosody-service-type}.  As its name indicates, an opaque configuration
does not have easy reflective capabilities.")
  (generate 'opaque-prosody-configuration)
  (format #t "For example, if your @code{prosody.cfg.lua} is just the empty
string, you could instantiate a prosody service like this:

@example
(service prosody-service-type
         (opaque-prosody-configuration
          (prosody.cfg.lua \"\")))
@end example"))

;;;
;;; BitlBee.
;;;

(define-record-type* <bitlbee-configuration>
  bitlbee-configuration make-bitlbee-configuration
  bitlbee-configuration?
  (bitlbee bitlbee-configuration-bitlbee
           (default bitlbee))
  (interface bitlbee-configuration-interface
             (default "127.0.0.1"))
  (port bitlbee-configuration-port
        (default 6667))
  (plugins bitlbee-plugins
           (default '()))
  (extra-settings bitlbee-configuration-extra-settings
                  (default "")))

(define bitlbee-shepherd-service
  (match-lambda
    (($ <bitlbee-configuration> bitlbee interface port
                                plugins extra-settings)
     (let ((conf (mixed-text-file "bitlbee.conf"
                                  "
  [settings]
  User = bitlbee
  ConfigDir = /var/lib/bitlbee
  DaemonInterface = " interface "
  DaemonPort = " (number->string port) "
  PluginDir = " (directory-union "bitlbee-plugins" plugins) "/lib/bitlbee
" extra-settings)))

       (with-imported-modules (source-module-closure
                               '((gnu build shepherd)
                                 (gnu system file-systems)))
         (list (shepherd-service
                (provision '(bitlbee))

                ;; Note: If networking is not up, then /etc/resolv.conf
                ;; doesn't get mapped in the container, hence the dependency
                ;; on 'networking'.
                (requirement '(user-processes networking))

                (modules '((gnu build shepherd)
                           (gnu system file-systems)))
                (start #~(make-forkexec-constructor/container
                          (list #$(file-append bitlbee "/sbin/bitlbee")
                                "-n" "-F" "-u" "bitlbee" "-c" #$conf)

                          #:pid-file "/var/run/bitlbee.pid"
                          #:mappings (list (file-system-mapping
                                            (source "/var/lib/bitlbee")
                                            (target source)
                                            (writable? #t)))))
                (stop  #~(make-kill-destructor)))))))))

(define %bitlbee-accounts
  ;; User group and account to run BitlBee.
  (list (user-group (name "bitlbee") (system? #t))
        (user-account
         (name "bitlbee")
         (group "bitlbee")
         (system? #t)
         (comment "BitlBee daemon user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define %bitlbee-activation
  ;; Activation gexp for BitlBee.
  #~(begin
      (use-modules (guix build utils))

      ;; This directory is used to store OTR data.
      (mkdir-p "/var/lib/bitlbee")
      (let ((user (getpwnam "bitlbee")))
        (chown "/var/lib/bitlbee"
               (passwd:uid user) (passwd:gid user)))))

(define bitlbee-service-type
  (service-type (name 'bitlbee)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          bitlbee-shepherd-service)
                       (service-extension account-service-type
                                          (const %bitlbee-accounts))
                       (service-extension activation-service-type
                                          (const %bitlbee-activation))))
                (default-value (bitlbee-configuration))
                (description
                 "Run @url{http://bitlbee.org,BitlBee}, a daemon that acts as
a gateway between IRC and chat networks.")))

(define* (bitlbee-service #:key (bitlbee bitlbee) ;deprecated
                          (interface "127.0.0.1") (port 6667)
                          (extra-settings ""))
  "Return a service that runs @url{http://bitlbee.org,BitlBee}, a daemon that
acts as a gateway between IRC and chat networks.

The daemon will listen to the interface corresponding to the IP address
specified in @var{interface}, on @var{port}.  @code{127.0.0.1} means that only
local clients can connect, whereas @code{0.0.0.0} means that connections can
come from any networking interface.

In addition, @var{extra-settings} specifies a string to append to the
configuration file."
  (service bitlbee-service-type
           (bitlbee-configuration
            (bitlbee bitlbee)
            (interface interface) (port port)
            (extra-settings extra-settings))))


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Sou Bunnbu <iyzsong@member.fsf.org>
;;; Copyright © 2018 Gábor Boskovits <boskovits@gmail.com>
;;;
;;; 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 monitoring)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages monitoring)
  #:use-module (gnu system shadow)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:export (darkstat-configuration
            prometheus-node-exporter-configuration
            darkstat-service-type
            prometheus-node-exporter-service-type))

;;;
;;; darkstat
;;;

(define-record-type* <darkstat-configuration>
  darkstat-configuration make-darkstat-configuration darkstat-configuration?
  (package      darkstat-configuration-package
                (default darkstat))
  (interface    darkstat-configuration-interface)
  (port         darkstat-configuration-port
                (default "667"))
  (bind-address darkstat-configuration-bind-address
                (default "127.0.0.1"))
  (base         darkstat-configuration-base
                (default "/")))

(define %darkstat-accounts
  (list (user-account
         (name "darkstat")
         (group "darkstat")
         (system? #t)
         (comment "darkstat daemon user")
         (home-directory "/var/lib/darkstat")
         (shell (file-append shadow "/sbin/nologin")))
        (user-group
         (name "darkstat")
         (system? #t))))

(define darkstat-shepherd-service
  (match-lambda
    (($ <darkstat-configuration>
        package interface port bind-address base)
     (shepherd-service
      (documentation "Network statistics gatherer.")
      (provision '(darkstat))
      (requirement '(networking))
      (start #~(make-forkexec-constructor
                (list #$(file-append package "/sbin/darkstat")
                      "-i" #$interface
                      "-p" #$port
                      "-b" #$bind-address
                      "--base" #$base
                      "--syslog" "--no-daemon"
                      "--chroot" "/var/lib/darkstat"
                      "--user" "darkstat"
                      "--import" "darkstat.db"
                      "--export" "darkstat.db")))
      (stop #~(make-kill-destructor))))))

(define darkstat-service-type
  (service-type
   (name 'darkstat)
   (description
    "Run @command{darkstat} to serve network traffic statictics reports over
HTTP.")
   (extensions
    (list (service-extension account-service-type
                             (const %darkstat-accounts))
          (service-extension shepherd-root-service-type
                             (compose list darkstat-shepherd-service))))))

(define-record-type* <prometheus-node-exporter-configuration>
  prometheus-node-exporter-configuration
  make-prometheus-node-exporter-configuration
  prometheus-node-exporter-configuration?
  (package prometheus-node-exporter-configuration-package
           (default go-github-com-prometheus-node-exporter))
  (web-listen-address prometheus-node-exporter-web-listen-address
                      (default ":9100")))

(define prometheus-node-exporter-shepherd-service
  (match-lambda
    (( $ <prometheus-node-exporter-configuration>
         package web-listen-address)
     (shepherd-service
      (documentation "Prometheus node exporter.")
      (provision '(prometheus-node-exporter))
      (requirement '(networking))
      (start #~(make-forkexec-constructor
                (list #$(file-append package "/bin/node_exporter")
                      "--web.listen-address" #$web-listen-address)))
      (stop #~(make-kill-destructor))))))

(define prometheus-node-exporter-service-type
  (service-type
   (name 'prometheus-node-exporter)
   (description
    "Run @command{node_exporter} to serve hardware and OS metrics to
prometheus.")
   (extensions
    (list (service-extension
           shepherd-root-service-type
           (compose list prometheus-node-exporter-shepherd-service))))))

license: mit


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2016, 2018 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2016 John Darrington <jmd@gnu.org>
;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
;;; Copyright © 2017 Thomas Danckaert <post@thomasdanckaert.be>
;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2018 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; 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 services base)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services dbus)
  #:use-module (gnu system shadow)
  #:use-module (gnu system pam)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages connman)
  #:use-module (gnu packages freedesktop)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages tor)
  #:use-module (gnu packages messaging)
  #:use-module (gnu packages networking)
  #:use-module (gnu packages ntp)
  #:use-module (gnu packages wicd)
  #:use-module (gnu packages gnome)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (guix modules)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-26)
  #:use-module (ice-9 match)
  #:re-export (static-networking-service
               static-networking-service-type)
  #:export (%facebook-host-aliases
            dhcp-client-service

            dhcpd-service-type
            dhcpd-configuration
            dhcpd-configuration?
            dhcpd-configuration-package
            dhcpd-configuration-config-file
            dhcpd-configuration-version
            dhcpd-configuration-run-directory
            dhcpd-configuration-lease-file
            dhcpd-configuration-pid-file
            dhcpd-configuration-interfaces

            %ntp-servers

            ntp-configuration
            ntp-configuration?
            ntp-service
            ntp-service-type

            openntpd-configuration
            openntpd-configuration?
            openntpd-service-type

            inetd-configuration
            inetd-entry
            inetd-service-type

            tor-configuration
            tor-configuration?
            tor-hidden-service
            tor-service
            tor-service-type

            wicd-service-type
            wicd-service

            network-manager-configuration
            network-manager-configuration?
            network-manager-configuration-dns
            network-manager-service-type

            connman-configuration
            connman-configuration?
            connman-service-type

            modem-manager-configuration
            modem-manager-configuration?
            modem-manager-service-type
            wpa-supplicant-service-type

            openvswitch-service-type
            openvswitch-configuration

            iptables-configuration
            iptables-configuration?
            iptables-configuration-iptables
            iptables-configuration-ipv4-rules
            iptables-configuration-ipv6-rules
            iptables-service-type))

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

(define %facebook-host-aliases
  ;; This is the list of known Facebook hosts to be added to /etc/hosts if you
  ;; are to block it.
  "\
# Block Facebook IPv4.
127.0.0.1   www.facebook.com
127.0.0.1   facebook.com
127.0.0.1   login.facebook.com
127.0.0.1   www.login.facebook.com
127.0.0.1   fbcdn.net
127.0.0.1   www.fbcdn.net
127.0.0.1   fbcdn.com
127.0.0.1   www.fbcdn.com
127.0.0.1   static.ak.fbcdn.net
127.0.0.1   static.ak.connect.facebook.com
127.0.0.1   connect.facebook.net
127.0.0.1   www.connect.facebook.net
127.0.0.1   apps.facebook.com

# Block Facebook IPv6.
fe80::1%lo0 facebook.com
fe80::1%lo0 login.facebook.com
fe80::1%lo0 www.login.facebook.com
fe80::1%lo0 fbcdn.net
fe80::1%lo0 www.fbcdn.net
fe80::1%lo0 fbcdn.com
fe80::1%lo0 www.fbcdn.com
fe80::1%lo0 static.ak.fbcdn.net
fe80::1%lo0 static.ak.connect.facebook.com
fe80::1%lo0 connect.facebook.net
fe80::1%lo0 www.connect.facebook.net
fe80::1%lo0 apps.facebook.com\n")

(define dhcp-client-service-type
  (shepherd-service-type
   'dhcp-client
   (lambda (dhcp)
     (define dhclient
       (file-append dhcp "/sbin/dhclient"))

     (define pid-file
       "/var/run/dhclient.pid")

     (shepherd-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.
                 (define valid?
                   (negate loopback-network-interface?))
                 (define ifaces
                   (filter valid? (all-network-interface-names)))

                 ;; XXX: Make sure the interfaces are up so that 'dhclient' can
                 ;; actually send/receive over them.
                 (for-each set-network-interface-up ifaces)

                 (false-if-exception (delete-file #$pid-file))
                 (let ((pid (fork+exec-command
                             (cons* #$dhclient "-nw"
                                    "-pf" #$pid-file ifaces))))
                   (and (zero? (cdr (waitpid pid)))
                        (read-pid-file #$pid-file)))))
      (stop #~(make-kill-destructor))))))

(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."
  (service dhcp-client-service-type dhcp))

(define-record-type* <dhcpd-configuration>
  dhcpd-configuration make-dhcpd-configuration
  dhcpd-configuration?
  (package   dhcpd-configuration-package ;<package>
             (default isc-dhcp))
  (config-file   dhcpd-configuration-config-file ;file-like
                 (default #f))
  (version dhcpd-configuration-version ;"4", "6", or "4o6"
              (default "4"))
  (run-directory dhcpd-configuration-run-directory
                 (default "/run/dhcpd"))
  (lease-file dhcpd-configuration-lease-file
              (default "/var/db/dhcpd.leases"))
  (pid-file dhcpd-configuration-pid-file
            (default "/run/dhcpd/dhcpd.pid"))
  ;; list of strings, e.g. (list "enp0s25")
  (interfaces dhcpd-configuration-interfaces
              (default '())))

(define dhcpd-shepherd-service
  (match-lambda
    (($ <dhcpd-configuration> package config-file version run-directory
                              lease-file pid-file interfaces)
     (unless config-file
       (error "Must supply a config-file"))
     (list (shepherd-service
            ;; Allow users to easily run multiple versions simultaneously.
            (provision (list (string->symbol
                              (string-append "dhcpv" version "-daemon"))))
            (documentation (string-append "Run the DHCPv" version " daemon"))
            (requirement '(networking))
            (start #~(make-forkexec-constructor
                      '(#$(file-append package "/sbin/dhcpd")
                        #$(string-append "-" version)
                        "-lf" #$lease-file
                        "-pf" #$pid-file
                        "-cf" #$config-file
                        #$@interfaces)
                      #:pid-file #$pid-file))
            (stop #~(make-kill-destructor)))))))

(define dhcpd-activation
  (match-lambda
    (($ <dhcpd-configuration> package config-file version run-directory
                              lease-file pid-file interfaces)
     (with-imported-modules '((guix build utils))
       #~(begin
           (unless (file-exists? #$run-directory)
             (mkdir #$run-directory))
           ;; According to the DHCP manual (man dhcpd.leases), the lease
           ;; database must be present for dhcpd to start successfully.
           (unless (file-exists? #$lease-file)
             (with-output-to-file #$lease-file
               (lambda _ (display ""))))
           ;; Validate the config.
           (invoke
            #$(file-append package "/sbin/dhcpd") "-t" "-cf"
            #$config-file))))))

(define dhcpd-service-type
  (service-type
   (name 'dhcpd)
   (extensions
    (list (service-extension shepherd-root-service-type dhcpd-shepherd-service)
          (service-extension activation-service-type dhcpd-activation)))))

(define %ntp-servers
  ;; Default set of NTP servers. These URLs are managed by the NTP Pool project.
  ;; Within Guix, Leo Famulari <leo@famulari.name> is the administrative contact
  ;; for this NTP pool "zone".
  '("0.guix.pool.ntp.org"
    "1.guix.pool.ntp.org"
    "2.guix.pool.ntp.org"
    "3.guix.pool.ntp.org"))

;;;
;;; NTP.
;;;

;; TODO: Export.
(define-record-type* <ntp-configuration>
  ntp-configuration make-ntp-configuration
  ntp-configuration?
  (ntp      ntp-configuration-ntp
            (default ntp))
  (servers  ntp-configuration-servers)
  (allow-large-adjustment? ntp-allow-large-adjustment?
                           (default #f)))

(define ntp-shepherd-service
  (match-lambda
    (($ <ntp-configuration> ntp servers allow-large-adjustment?)
     (let ()
       ;; TODO: Add authentication support.
       (define config
         (string-append "driftfile /var/run/ntpd/ntp.drift\n"
                        (string-join (map (cut string-append "server " <>)
                                          servers)
                                     "\n")
                        "
# Disable status queries as a workaround for CVE-2013-5211:
# <http://support.ntp.org/bin/view/Main/SecurityNotice#DRDoS_Amplification_Attack_using>.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery

# Yet, allow use of the local 'ntpq'.
restrict 127.0.0.1
restrict -6 ::1\n"))

       (define ntpd.conf
         (plain-file "ntpd.conf" config))

       (list (shepherd-service
              (provision '(ntpd))
              (documentation "Run the Network Time Protocol (NTP) daemon.")
              (requirement '(user-processes networking))
              (start #~(make-forkexec-constructor
                        (list (string-append #$ntp "/bin/ntpd") "-n"
                              "-c" #$ntpd.conf "-u" "ntpd"
                              #$@(if allow-large-adjustment?
                                     '("-g")
                                     '()))))
              (stop #~(make-kill-destructor))))))))

(define %ntp-accounts
  (list (user-account
         (name "ntpd")
         (group "nogroup")
         (system? #t)
         (comment "NTP daemon user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define (ntp-service-activation config)
  "Return the activation gexp for CONFIG."
  (with-imported-modules '((guix build utils))
    #~(begin
        (use-modules (guix build utils))
        (define %user
          (getpw "ntpd"))

        (let ((directory "/var/run/ntpd"))
          (mkdir-p directory)
          (chown directory (passwd:uid %user) (passwd:gid %user))))))

(define ntp-service-type
  (service-type (name 'ntp)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          ntp-shepherd-service)
                       (service-extension account-service-type
                                          (const %ntp-accounts))
                       (service-extension activation-service-type
                                          ntp-service-activation)))
                (description
                 "Run the @command{ntpd}, the Network Time Protocol (NTP)
daemon of the @uref{http://www.ntp.org, Network Time Foundation}.  The daemon
will keep the system clock synchronized with that of the given servers.")))

(define* (ntp-service #:key (ntp ntp)
                      (servers %ntp-servers)
                      allow-large-adjustment?)
  "Return a service that runs the daemon from @var{ntp}, the
@uref{http://www.ntp.org, Network Time Protocol package}.  The daemon will
keep the system clock synchronized with that of @var{servers}.
@var{allow-large-adjustment?} determines whether @command{ntpd} is allowed to
make an initial adjustment of more than 1,000 seconds."
  (service ntp-service-type
           (ntp-configuration (ntp ntp)
                              (servers servers)
                              (allow-large-adjustment?
                               allow-large-adjustment?))))

;;;
;;; OpenNTPD.
;;;

(define-record-type* <openntpd-configuration>
  openntpd-configuration make-openntpd-configuration
  openntpd-configuration?
  (openntpd                openntpd-configuration-openntpd
                           (default openntpd))
  (listen-on               openntpd-listen-on
                           (default '("127.0.0.1"
                                      "::1")))
  (query-from              openntpd-query-from
                           (default '()))
  (sensor                  openntpd-sensor
                           (default '()))
  (server                  openntpd-server
                           (default %ntp-servers))
  (servers                 openntpd-servers
                           (default '()))
  (constraint-from         openntpd-constraint-from
                           (default '()))
  (constraints-from        openntpd-constraints-from
                           (default '()))
  (allow-large-adjustment? openntpd-allow-large-adjustment?
                           (default #f))) ; upstream default

(define (openntpd-shepherd-service config)
  (match-record config <openntpd-configuration>
    (openntpd listen-on query-from sensor server servers constraint-from
              constraints-from allow-large-adjustment?)
    (let ()
      (define config
        (string-join
          (filter-map
            (lambda (field value)
              (string-join
                (map (cut string-append field <> "\n")
                     value)))
            '("listen on " "query from " "sensor " "server " "servers "
              "constraint from ")
            (list listen-on query-from sensor server servers constraint-from))
          ;; The 'constraints from' field needs to be enclosed in double quotes.
          (string-join
            (map (cut string-append "constraints from \"" <> "\"\n")
                 constraints-from))))

      (define ntpd.conf
        (plain-file "ntpd.conf" config))

      (list (shepherd-service
              (provision '(ntpd))
              (documentation "Run the Network Time Protocol (NTP) daemon.")
              (requirement '(user-processes networking))
              (start #~(make-forkexec-constructor
                         (list (string-append #$openntpd "/sbin/ntpd")
                               "-f" #$ntpd.conf
                               "-d" ;; don't daemonize
                               #$@(if allow-large-adjustment?
                                    '("-s")
                                    '()))
                         ;; When ntpd is daemonized it repeatedly tries to respawn
                         ;; while running, leading shepherd to disable it.  To
                         ;; prevent spamming stderr, redirect output to logfile.
                         #:log-file "/var/log/ntpd"))
              (stop #~(make-kill-destructor)))))))

(define (openntpd-service-activation config)
  "Return the activation gexp for CONFIG."
  (with-imported-modules '((guix build utils))
    #~(begin
        (use-modules (guix build utils))

        (mkdir-p "/var/db")
        (mkdir-p "/var/run")
        (unless (file-exists? "/var/db/ntpd.drift")
          (with-output-to-file "/var/db/ntpd.drift"
                               (lambda _
                                 (format #t "0.0")))))))

(define openntpd-service-type
  (service-type (name 'openntpd)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          openntpd-shepherd-service)
                       (service-extension account-service-type
                                          (const %ntp-accounts))
                       (service-extension profile-service-type
                                          (compose list openntpd-configuration-openntpd))
                       (service-extension activation-service-type
                                          openntpd-service-activation)))
                (default-value (openntpd-configuration))
                (description
                 "Run the @command{ntpd}, the Network Time Protocol (NTP)
daemon, as implemented by @uref{http://www.openntpd.org, OpenNTPD}.  The
daemon will keep the system clock synchronized with that of the given servers.")))

;;;
;;; Inetd.
;;;

(define-record-type* <inetd-configuration> inetd-configuration
  make-inetd-configuration
  inetd-configuration?
  (program           inetd-configuration-program   ;file-like
                     (default (file-append inetutils "/libexec/inetd")))
  (entries           inetd-configuration-entries   ;list of <inetd-entry>
                     (default '())))

(define-record-type* <inetd-entry> inetd-entry make-inetd-entry
  inetd-entry?
  (node              inetd-entry-node         ;string or #f
                     (default #f))
  (name              inetd-entry-name)        ;string, from /etc/services

  (socket-type       inetd-entry-socket-type) ;stream | dgram | raw |
                                              ;rdm | seqpacket
  (protocol          inetd-entry-protocol)    ;string, from /etc/protocols

  (wait?             inetd-entry-wait?        ;Boolean
                     (default #t))
  (user              inetd-entry-user)        ;string

  (program           inetd-entry-program      ;string or file-like object
                     (default "internal"))
  (arguments         inetd-entry-arguments    ;list of strings or file-like objects
                     (default '())))

(define (inetd-config-file entries)
  (apply mixed-text-file "inetd.conf"
         (map
          (lambda (entry)
            (let* ((node (inetd-entry-node entry))
                   (name (inetd-entry-name entry))
                   (socket
                    (if node (string-append node ":" name) name))
                   (type
                    (match (inetd-entry-socket-type entry)
                      ((or 'stream 'dgram 'raw 'rdm 'seqpacket)
                       (symbol->string (inetd-entry-socket-type entry)))))
                   (protocol (inetd-entry-protocol entry))
                   (wait (if (inetd-entry-wait? entry) "wait" "nowait"))
                   (user (inetd-entry-user entry))
                   (program (inetd-entry-program entry))
                   (args (inetd-entry-arguments entry)))
              #~(string-append
                 (string-join
                  (list #$@(list socket type protocol wait user program) #$@args)
                  " ") "\n")))
          entries)))

(define inetd-shepherd-service
  (match-lambda
    (($ <inetd-configuration> program ()) '()) ; empty list of entries -> do nothing
    (($ <inetd-configuration> program entries)
     (list
      (shepherd-service
       (documentation "Run inetd.")
       (provision '(inetd))
       (requirement '(user-processes networking syslogd))
       (start #~(make-forkexec-constructor
                 (list #$program #$(inetd-config-file entries))
                 #:pid-file "/var/run/inetd.pid"))
       (stop #~(make-kill-destructor)))))))

(define-public inetd-service-type
  (service-type
   (name 'inetd)
   (extensions
    (list (service-extension shepherd-root-service-type
                             inetd-shepherd-service)))

   ;; The service can be extended with additional lists of entries.
   (compose concatenate)
   (extend (lambda (config entries)
             (inetd-configuration
              (inherit config)
              (entries (append (inetd-configuration-entries config)
                               entries)))))
   (description
    "Start @command{inetd}, the @dfn{Internet superserver}.  It is responsible
for listening on Internet sockets and spawning the corresponding services on
demand.")))

;;;
;;; Tor.
;;;

(define-record-type* <tor-configuration>
  tor-configuration make-tor-configuration
  tor-configuration?
  (tor              tor-configuration-tor
                    (default tor))
  (config-file      tor-configuration-config-file
                    (default (plain-file "empty" "")))
  (hidden-services  tor-configuration-hidden-services
                    (default '()))
  (socks-socket-type tor-configuration-socks-socket-type ; 'tcp or 'unix
                     (default 'tcp)))

(define %tor-accounts
  ;; User account and groups for Tor.
  (list (user-group (name "tor") (system? #t))
        (user-account
         (name "tor")
         (group "tor")
         (system? #t)
         (comment "Tor daemon user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define-record-type <hidden-service>
  (hidden-service name mapping)
  hidden-service?
  (name    hidden-service-name)                   ;string
  (mapping hidden-service-mapping))               ;list of port/address tuples

(define (tor-configuration->torrc config)
  "Return a 'torrc' file for CONFIG."
  (match config
    (($ <tor-configuration> tor config-file services socks-socket-type)
     (computed-file
      "torrc"
      (with-imported-modules '((guix build utils))
        #~(begin
            (use-modules (guix build utils)
                         (ice-9 match))

            (call-with-output-file #$output
              (lambda (port)
                (display "\
### These lines were generated from your system configuration:
User tor
DataDirectory /var/lib/tor
PidFile /var/run/tor/tor.pid
Log notice syslog\n" port)
                (when (eq? 'unix '#$socks-socket-type)
                  (display "\
SocksPort unix:/var/run/tor/socks-sock
UnixSocksGroupWritable 1\n" port))

                (for-each (match-lambda
                            ((service (ports hosts) ...)
                             (format port "\
HiddenServiceDir /var/lib/tor/hidden-services/~a~%"
                                     service)
                             (for-each (lambda (tcp-port host)
                                         (format port "\
HiddenServicePort ~a ~a~%"
                                                 tcp-port host))
                                       ports hosts)))
                          '#$(map (match-lambda
                                    (($ <hidden-service> name mapping)
                                     (cons name mapping)))
                                  services))

                (display "\
### End of automatically generated lines.\n\n" port)

                ;; Append the user's config file.
                (call-with-input-file #$config-file
                  (lambda (input)
                    (dump-port input port)))
                #t))))))))

(define (tor-shepherd-service config)
  "Return a <shepherd-service> running Tor."
  (match config
    (($ <tor-configuration> tor)
     (let ((torrc (tor-configuration->torrc config)))
       (with-imported-modules (source-module-closure
                               '((gnu build shepherd)
                                 (gnu system file-systems)))
         (list (shepherd-service
                (provision '(tor))

                ;; Tor needs at least one network interface to be up, hence the
                ;; dependency on 'loopback'.
                (requirement '(user-processes loopback syslogd))

                (modules '((gnu build shepherd)
                           (gnu system file-systems)))

                (start #~(make-forkexec-constructor/container
                          (list #$(file-append tor "/bin/tor") "-f" #$torrc)

                          #:mappings (list (file-system-mapping
                                            (source "/var/lib/tor")
                                            (target source)
                                            (writable? #t))
                                           (file-system-mapping
                                            (source "/dev/log") ;for syslog
                                            (target source))
                                           (file-system-mapping
                                            (source "/var/run/tor")
                                            (target source)
                                            (writable? #t)))
                          #:pid-file "/var/run/tor/tor.pid"))
                (stop #~(make-kill-destructor))
                (documentation "Run the Tor anonymous network overlay."))))))))

(define (tor-activation config)
  "Set up directories for Tor and its hidden services, if any."
  #~(begin
      (use-modules (guix build utils))

      (define %user
        (getpw "tor"))

      (define (initialize service)
        (let ((directory (string-append "/var/lib/tor/hidden-services/"
                                        service)))
          (mkdir-p directory)
          (chown directory (passwd:uid %user) (passwd:gid %user))

          ;; The daemon bails out if we give wider permissions.
          (chmod directory #o700)))

      ;; Allow Tor to write its PID file.
      (mkdir-p "/var/run/tor")
      (chown "/var/run/tor" (passwd:uid %user) (passwd:gid %user))
      ;; Set the group permissions to rw so that if the system administrator
      ;; has specified UnixSocksGroupWritable=1 in their torrc file, members
      ;; of the "tor" group will be able to use the SOCKS socket.
      (chmod "/var/run/tor" #o750)

      ;; Allow Tor to access the hidden services' directories.
      (mkdir-p "/var/lib/tor")
      (chown "/var/lib/tor" (passwd:uid %user) (passwd:gid %user))
      (chmod "/var/lib/tor" #o700)

      ;; Make sure /var/lib is accessible to the 'tor' user.
      (chmod "/var/lib" #o755)

      (for-each initialize
                '#$(map hidden-service-name
                        (tor-configuration-hidden-services config)))))

(define tor-service-type
  (service-type (name 'tor)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          tor-shepherd-service)
                       (service-extension account-service-type
                                          (const %tor-accounts))
                       (service-extension activation-service-type
                                          tor-activation)))

                ;; This can be extended with hidden services.
                (compose concatenate)
                (extend (lambda (config services)
                          (tor-configuration
                           (inherit config)
                           (hidden-services
                            (append (tor-configuration-hidden-services config)
                                    services)))))
                (default-value (tor-configuration))
                (description
                 "Run the @uref{https://torproject.org, Tor} anonymous
networking daemon.")))

(define* (tor-service #:optional
                      (config-file (plain-file "empty" ""))
                      #:key (tor tor))
  "Return a service to run the @uref{https://torproject.org, Tor} anonymous
networking daemon.

The daemon runs as the @code{tor} unprivileged user.  It is passed
@var{config-file}, a file-like object, with an additional @code{User tor} line
and lines for hidden services added via @code{tor-hidden-service}.  Run
@command{man tor} for information about the configuration file."
  (service tor-service-type
           (tor-configuration (tor tor)
                              (config-file config-file))))

(define tor-hidden-service-type
  ;; A type that extends Tor with hidden services.
  (service-type (name 'tor-hidden-service)
                (extensions
                 (list (service-extension tor-service-type list)))
                (description
                 "Define a new Tor @dfn{hidden service}.")))

(define (tor-hidden-service name mapping)
  "Define a new Tor @dfn{hidden service} called @var{name} and implementing
@var{mapping}.  @var{mapping} is a list of port/host tuples, such as:

@example
 '((22 \"127.0.0.1:22\")
   (80 \"127.0.0.1:8080\"))
@end example

In this example, port 22 of the hidden service is mapped to local port 22, and
port 80 is mapped to local port 8080.

This creates a @file{/var/lib/tor/hidden-services/@var{name}} directory, where
the @file{hostname} file contains the @code{.onion} host name for the hidden
service.

See @uref{https://www.torproject.org/docs/tor-hidden-service.html.en, the Tor
project's documentation} for more information."
  (service tor-hidden-service-type
           (hidden-service name mapping)))

;;;
;;; Wicd.
;;;

(define %wicd-activation
  ;; Activation gexp for Wicd.
  #~(begin
      (use-modules (guix build utils))

      (mkdir-p "/etc/wicd")
      (let ((file-name "/etc/wicd/dhclient.conf.template.default"))
        (unless (file-exists? file-name)
          (copy-file (string-append #$wicd file-name)
                     file-name)))

      ;; Wicd invokes 'wpa_supplicant', which needs this directory for its
      ;; named socket files.
      (mkdir-p "/var/run/wpa_supplicant")
      (chmod "/var/run/wpa_supplicant" #o750)))

(define (wicd-shepherd-service wicd)
  "Return a shepherd service for WICD."
  (list (shepherd-service
         (documentation "Run the Wicd network manager.")
         (provision '(networking))
         (requirement '(user-processes dbus-system loopback))
         (start #~(make-forkexec-constructor
                   (list (string-append #$wicd "/sbin/wicd")
                         "--no-daemon")))
         (stop #~(make-kill-destructor)))))

(define wicd-service-type
  (service-type (name 'wicd)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          wicd-shepherd-service)
                       (service-extension dbus-root-service-type
                                          list)
                       (service-extension activation-service-type
                                          (const %wicd-activation))

                       ;; Add Wicd to the global profile.
                       (service-extension profile-service-type list)))
                (description
                 "Run @url{https://launchpad.net/wicd,Wicd}, a network
management daemon that aims to simplify wired and wireless networking.")))

(define* (wicd-service #:key (wicd wicd))
  "Return a service that runs @url{https://launchpad.net/wicd,Wicd}, a network
management daemon that aims to simplify wired and wireless networking.

This service adds the @var{wicd} package to the global profile, providing
several commands to interact with the daemon and configure networking:
@command{wicd-client}, a graphical user interface, and the @command{wicd-cli}
and @command{wicd-curses} user interfaces."
  (service wicd-service-type wicd))

;;;
;;; ModemManager
;;;

(define-record-type* <modem-manager-configuration>
  modem-manager-configuration make-modem-manager-configuration
  modem-manager-configuration?
  (modem-manager modem-manager-configuration-modem-manager
                   (default modem-manager)))

;;;
;;; NetworkManager
;;;

(define-record-type* <network-manager-configuration>
  network-manager-configuration make-network-manager-configuration
  network-manager-configuration?
  (network-manager network-manager-configuration-network-manager
                   (default network-manager))
  (dns network-manager-configuration-dns
       (default "default"))
  (vpn-plugins network-manager-vpn-plugins        ;list of <package>
               (default '())))

(define %network-manager-activation
  ;; Activation gexp for NetworkManager.
  #~(begin
      (use-modules (guix build utils))
      (mkdir-p "/etc/NetworkManager/system-connections")))

(define (vpn-plugin-directory plugins)
  "Return a directory containing PLUGINS, the NM VPN plugins."
  (directory-union "network-manager-vpn-plugins" plugins))

(define network-manager-environment
  (match-lambda
    (($ <network-manager-configuration> network-manager dns vpn-plugins)
     ;; Define this variable in the global environment such that
     ;; "nmcli connection import type openvpn file foo.ovpn" works.
     `(("NM_VPN_PLUGIN_DIR"
        . ,(file-append (vpn-plugin-directory vpn-plugins)
                        "/lib/NetworkManager/VPN"))))))

(define network-manager-shepherd-service
  (match-lambda
    (($ <network-manager-configuration> network-manager dns vpn-plugins)
     (let ((conf (plain-file "NetworkManager.conf"
                             (string-append "[main]\ndns=" dns "\n")))
           (vpn  (vpn-plugin-directory vpn-plugins)))
       (list (shepherd-service
              (documentation "Run the NetworkManager.")
              (provision '(networking))
              (requirement '(user-processes dbus-system wpa-supplicant loopback))
              (start #~(make-forkexec-constructor
                        (list (string-append #$network-manager
                                             "/sbin/NetworkManager")
                              (string-append "--config=" #$conf)
                              "--no-daemon")
                        #:environment-variables
                        (list (string-append "NM_VPN_PLUGIN_DIR=" #$vpn
                                             "/lib/NetworkManager/VPN"))))
              (stop #~(make-kill-destructor))))))))

(define network-manager-service-type
  (let
      ((config->package
        (match-lambda
         (($ <network-manager-configuration> network-manager)
          (list network-manager)))))

    (service-type
     (name 'network-manager)
     (extensions
      (list (service-extension shepherd-root-service-type
                               network-manager-shepherd-service)
            (service-extension dbus-root-service-type config->package)
            (service-extension polkit-service-type config->package)
            (service-extension activation-service-type
                               (const %network-manager-activation))
            (service-extension session-environment-service-type
                               network-manager-environment)
            ;; Add network-manager to the system profile.
            (service-extension profile-service-type config->package)))
     (default-value (network-manager-configuration))
     (description
      "Run @uref{https://wiki.gnome.org/Projects/NetworkManager,
NetworkManager}, a network management daemon that aims to simplify wired and
wireless networking."))))

;;;
;;; Connman
;;;

(define-record-type* <connman-configuration>
  connman-configuration make-connman-configuration
  connman-configuration?
  (connman      connman-configuration-connman
                (default connman))
  (disable-vpn? connman-configuration-disable-vpn?
                (default #f)))

(define (connman-activation config)
  (let ((disable-vpn? (connman-configuration-disable-vpn? config)))
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils))
          (mkdir-p "/var/lib/connman/")
          (unless #$disable-vpn?
            (mkdir-p "/var/lib/connman-vpn/"))))))

(define (connman-shepherd-service config)
  "Return a shepherd service for Connman"
  (and
   (connman-configuration? config)
   (let ((connman      (connman-configuration-connman config))
         (disable-vpn? (connman-configuration-disable-vpn? config)))
     (list (shepherd-service
            (documentation "Run Connman")
            (provision '(networking))
            (requirement
             '(user-processes dbus-system loopback wpa-supplicant))
            (start #~(make-forkexec-constructor
                      (list (string-append #$connman
                                           "/sbin/connmand")
                            "-n" "-r"
                            #$@(if disable-vpn? '("--noplugin=vpn") '()))))
            (stop #~(make-kill-destructor)))))))

(define connman-service-type
  (let ((connman-package (compose list connman-configuration-connman)))
    (service-type (name 'connman)
                  (extensions
                   (list (service-extension shepherd-root-service-type
                                            connman-shepherd-service)
                         (service-extension polkit-service-type
                                            connman-package)
                         (service-extension dbus-root-service-type
                                            connman-package)
                         (service-extension activation-service-type
                                            connman-activation)
                         ;; Add connman to the system profile.
                         (service-extension profile-service-type
                                            connman-package)))
                  (default-value (connman-configuration))
                  (description
                   "Run @url{https://01.org/connman,Connman},
a network connection manager."))))

;;;
;;; Modem manager
;;;

(define modem-manager-service-type
  (let ((config->package
         (match-lambda
          (($ <modem-manager-configuration> modem-manager)
           (list modem-manager)))))
    (service-type (name 'modem-manager)
                  (extensions
                   (list (service-extension dbus-root-service-type
                                            config->package)
                         (service-extension udev-service-type
                                            config->package)
                         (service-extension polkit-service-type
                                            config->package)))
                  (default-value (modem-manager-configuration))
                  (description
                   "Run @uref{https://wiki.gnome.org/Projects/ModemManager,
ModemManager}, a modem management daemon that aims to simplify dialup
networking."))))

;;;
;;; WPA supplicant
;;;

(define (wpa-supplicant-shepherd-service wpa-supplicant)
  "Return a shepherd service for wpa_supplicant"
  (list (shepherd-service
         (documentation "Run WPA supplicant with dbus interface")
         (provision '(wpa-supplicant))
         (requirement '(user-processes dbus-system loopback))
         (start #~(make-forkexec-constructor
                   (list (string-append #$wpa-supplicant
                                        "/sbin/wpa_supplicant")
                         "-u" "-B" "-P/var/run/wpa_supplicant.pid")
                   #:pid-file "/var/run/wpa_supplicant.pid"))
         (stop #~(make-kill-destructor)))))

(define wpa-supplicant-service-type
  (service-type (name 'wpa-supplicant)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          wpa-supplicant-shepherd-service)
                       (service-extension dbus-root-service-type list)
                       (service-extension profile-service-type list)))
                (default-value wpa-supplicant)))

;;;
;;; Open vSwitch
;;;

(define-record-type* <openvswitch-configuration>
  openvswitch-configuration make-openvswitch-configuration
  openvswitch-configuration?
  (package openvswitch-configuration-package
           (default openvswitch)))

(define openvswitch-activation
  (match-lambda
    (($ <openvswitch-configuration> package)
     (let ((ovsdb-tool (file-append package "/bin/ovsdb-tool")))
       (with-imported-modules '((guix build utils))
         #~(begin
             (use-modules (guix build utils))
             (mkdir-p "/var/run/openvswitch")
             (mkdir-p "/var/lib/openvswitch")
             (let ((conf.db "/var/lib/openvswitch/conf.db"))
               (unless (file-exists? conf.db)
                 (system* #$ovsdb-tool "create" conf.db)))))))))

(define openvswitch-shepherd-service
  (match-lambda
    (($ <openvswitch-configuration> package)
     (let ((ovsdb-server (file-append package "/sbin/ovsdb-server"))
           (ovs-vswitchd (file-append package "/sbin/ovs-vswitchd")))
       (list
        (shepherd-service
         (provision '(ovsdb))
         (documentation "Run the Open vSwitch database server.")
         (start #~(make-forkexec-constructor
                   (list #$ovsdb-server "--pidfile"
                         "--remote=punix:/var/run/openvswitch/db.sock")
                   #:pid-file "/var/run/openvswitch/ovsdb-server.pid"))
         (stop #~(make-kill-destructor)))
        (shepherd-service
         (provision '(vswitchd))
         (requirement '(ovsdb))
         (documentation "Run the Open vSwitch daemon.")
         (start #~(make-forkexec-constructor
                   (list #$ovs-vswitchd "--pidfile")
                   #:pid-file "/var/run/openvswitch/ovs-vswitchd.pid"))
         (stop #~(make-kill-destructor))))))))

(define openvswitch-service-type
  (service-type
   (name 'openvswitch)
   (extensions
    (list (service-extension activation-service-type
                             openvswitch-activation)
          (service-extension profile-service-type
                             (compose list openvswitch-configuration-package))
          (service-extension shepherd-root-service-type
                             openvswitch-shepherd-service)))
   (description
    "Run @uref{http://www.openvswitch.org, Open vSwitch}, a multilayer virtual
switch designed to enable massive network automation through programmatic
extension.")))

;;;
;;; iptables
;;;

(define %iptables-accept-all-rules
  (plain-file "iptables-accept-all.rules"
              "*filter
:INPUT ACCEPT
:FORWARD ACCEPT
:OUTPUT ACCEPT
COMMIT
"))

(define-record-type* <iptables-configuration>
  iptables-configuration make-iptables-configuration iptables-configuration?
  (iptables iptables-configuration-iptables
            (default iptables))
  (ipv4-rules iptables-configuration-ipv4-rules
              (default %iptables-accept-all-rules))
  (ipv6-rules iptables-configuration-ipv6-rules
              (default %iptables-accept-all-rules)))

(define iptables-shepherd-service
  (match-lambda
    (($ <iptables-configuration> iptables ipv4-rules ipv6-rules)
     (let ((iptables-restore (file-append iptables "/sbin/iptables-restore"))
           (ip6tables-restore (file-append iptables "/sbin/ip6tables-restore")))
       (shepherd-service
        (documentation "Packet filtering framework")
        (provision '(iptables))
        (start #~(lambda _
                   (invoke #$iptables-restore #$ipv4-rules)
                   (invoke #$ip6tables-restore #$ipv6-rules)))
        (stop #~(lambda _
                  (invoke #$iptables-restore #$%iptables-accept-all-rules)
                  (invoke #$ip6tables-restore #$%iptables-accept-all-rules))))))))

(define iptables-service-type
  (service-type
   (name 'iptables)
   (description
    "Run @command{iptables-restore}, setting up the specified rules.")
   (extensions
    (list (service-extension shepherd-root-service-type
                             (compose list iptables-shepherd-service))))))

;;; networking.scm ends here


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 John Darrington <jmd@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 nfs)
  #:use-module (gnu)
  #:use-module (gnu services shepherd)
  #:use-module (gnu packages onc-rpc)
  #:use-module (gnu packages linux)
  #:use-module (guix)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:use-module (gnu build file-systems)
  #:export (rpcbind-service-type
            rpcbind-configuration
            rpcbind-configuration?

            pipefs-service-type
            pipefs-configuration
            pipefs-configuration?

            idmap-service-type
            idmap-configuration
            idmap-configuration?

            gss-service-type
            gss-configuration
            gss-configuration?))

(define default-pipefs-directory "/var/lib/nfs/rpc_pipefs")

(define-record-type* <rpcbind-configuration>
  rpcbind-configuration make-rpcbind-configuration
  rpcbind-configuration?
  (rpcbind             rpcbind-configuration-rpcbind
                       (default rpcbind))
  (warm-start?         rpcbind-configuration-warm-start?
                       (default #t)))

(define rpcbind-service-type
  (shepherd-service-type
   'rpcbind
   (lambda (config)
     (define nfs-utils
       (rpcbind-configuration-rpcbind config))

     (define rpcbind-command
       #~(list (string-append #$nfs-utils "/bin/rpcbind") "-f"
               #$@(if (rpcbind-configuration-warm-start? config) '("-w") '())))

     (shepherd-service
      (documentation "Start the RPC bind daemon.")
      (requirement '(networking))
      (provision '(rpcbind-daemon))

      (start #~(make-forkexec-constructor #$rpcbind-command))
      (stop #~(make-kill-destructor))))))

(define-record-type* <pipefs-configuration>
  pipefs-configuration make-pipefs-configuration
  pipefs-configuration?
  (mount-point           pipefs-configuration-mount-point
                         (default default-pipefs-directory)))

(define pipefs-service-type
  (shepherd-service-type
   'pipefs
   (lambda (config)
     (define pipefs-directory (pipefs-configuration-mount-point config))

     (shepherd-service
      (documentation "Mount the pipefs pseudo file system.")
      (provision '(rpc-pipefs))

      (start #~(lambda ()
                 (mkdir-p #$pipefs-directory)
                 (mount "rpc_pipefs" #$pipefs-directory "rpc_pipefs")
                 (member #$pipefs-directory (mount-points))))

      (stop #~(lambda (pid . args)
                (umount #$pipefs-directory MNT_DETACH)
                (not (member #$pipefs-directory (mount-points)))))))))

(define-record-type* <gss-configuration>
  gss-configuration make-gss-configuration
  gss-configuration?
  (pipefs-directory            gss-configuration-pipefs-directory
                         (default default-pipefs-directory))
  (nfs-utils             gss-configuration-gss
                         (default nfs-utils)))

(define gss-service-type
  (shepherd-service-type
   'gss
   (lambda (config)
     (define nfs-utils
       (gss-configuration-gss config))

     (define pipefs-directory
       (gss-configuration-pipefs-directory config))

     (define gss-command
       #~(list (string-append #$nfs-utils "/sbin/rpc.gssd") "-f"
               "-p" #$pipefs-directory))

     (shepherd-service
      (documentation "Start the RPC GSS daemon.")
      (requirement '(rpcbind-daemon rpc-pipefs))
      (provision '(gss-daemon))

      (start #~(make-forkexec-constructor #$gss-command))
      (stop #~(make-kill-destructor))))))

(define-record-type* <idmap-configuration>
  idmap-configuration make-idmap-configuration
  idmap-configuration?
  (pipefs-directory            idmap-configuration-pipefs-directory
                         (default default-pipefs-directory))
  (domain                idmap-configuration-domain
                           (default #f))
  (nfs-utils             idmap-configuration-idmap
                         (default nfs-utils)))

(define idmap-service-type
  (shepherd-service-type
   'idmap
   (lambda (config)

     (define nfs-utils
       (idmap-configuration-idmap config))

     (define pipefs-directory
       (idmap-configuration-pipefs-directory config))

     (define domain (idmap-configuration-domain config))

     (define (idmap-config-file config)
       (plain-file "idmapd.conf"
                   (string-append
                    "\n[General]\n"
                    (if domain
                        (format #f "Domain = ~a\n" domain))
                    "\n[Mapping]\n"
                    "Nobody-User = nobody\n"
                    "Nobody-Group = nogroup\n")))

     (define idmap-command
       #~(list (string-append #$nfs-utils "/sbin/rpc.idmapd") "-f"
               "-p" #$pipefs-directory
               "-c" #$(idmap-config-file config)))

     (shepherd-service
       (documentation "Start the RPC IDMAP daemon.")
       (requirement '(rpcbind-daemon rpc-pipefs))
       (provision '(idmap-daemon))
       (start #~(make-forkexec-constructor #$idmap-command))
       (stop #~(make-kill-destructor))))))