;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2017, 2018 Clément Lassieur ;;; Copyright © 2017 Mathieu Othacehe ;;; Copyright © 2015, 2017, 2018 Ludovic Courtès ;;; Copyright © 2018 Pierre-Antoine Rouby ;;; ;;; 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 . (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) "Maximum2020-05-13fix corner case in `reduce_vars` (#3895)...fixes #3894Alex Lam S.L 2020-05-12fix corner case in `reduce_vars` (#3881)...fixes #3880Alex Lam S.L 2020-05-11enhance `evaluate` & `reduce_vars` (#3873)Alex Lam S.L 2020-05-10enhance `evaluate` & `reduce_vars` (#3870)Alex Lam S.L 2020-05-10fix corner case in `reduce_vars` (#3867)...fixes #3866Alex Lam S.L 2020-05-04fix corner case in `reduce_vars` (#3845)...fixes #3844Alex Lam S.L 2020-05-03enhance `reduce_vars` (#3843)Alex Lam S.L 2020-05-01enhance `inline` (#3832)Alex Lam S.L 2020-04-24improve `compress` (#3814)...- avoid identifier overflow through consecutive API calls - simplify `reduce_vars` - enhance `unsafe` `evaluate`Alex Lam S.L 2020-04-18enhance `unused` (#3794)Alex Lam S.L 2020-04-11fix corner case in `reduce_vars` (#3775)...fixes #3774Alex Lam S.L 2020-04-10enhance `inline` (#3767)Alex Lam S.L #$@(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)) #$(serialize-ext-component-configuration-list (prosody-configuration-ext-components config)))) (define-configuration opaque-prosody-configuration (prosody (package prosody) "The prosody package.") (prosody.cfg.lua (string (configuration-missing-field 'opaque-prosody-configuration 'prosody.cfg.lua)) "The contents of the @code{prosody.cfg.lua} to use.")) (define (prosody-shepherd-service config) "Return a for Prosody with CONFIG." (let* ((prosody (if (opaque-prosody-configuration? config) (opaque-prosody-configuration-prosody config) (prosody-configuration-prosody config))) (prosodyctl-bin (file-append prosody "/bin/prosodyctl")) (pid-file (prosody-configuration-pidfile config)) (prosodyctl-action (lambda args #~(lambda _ (invoke #$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 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 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))))