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;;; guix-arunisaac --- arunisaac's Guix odds and ends
;;; Copyright © 2023 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of guix-arunisaac.
;;;
;;; guix-arunisaac 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.
;;;
;;; guix-arunisaac 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 guix-arunisaac. If not, see
;;; <https://www.gnu.org/licenses/>.
(define-module (arunisaac powerdns)
#:use-module (ice-9 match)
#:use-module (gnu packages admin)
#:use-module (gnu packages boost)
#:use-module (gnu packages lua)
#:use-module (gnu packages pkg-config)
#:use-module (gnu packages tls)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu system shadow)
#:use-module (guix build-system gnu)
#:use-module (guix download)
#:use-module (guix gexp)
#:use-module ((guix licenses) #:prefix license:)
#:use-module (guix packages)
#:use-module (guix records)
#:export (powerdns-configuration
powerdns-configuration?
powerdns-configuration-package
powerdns-configuration-backends
powerdns-configuration-expand-alias?
powerdns-configuration-local-address
powerdns-configuration-local-port
powerdns-configuration-socket-directory
powerdns-configuration-resolver
powerdns-configuration-zone-cache-refresh-interval
powerdns-configuration-bind-config
powerdns-configuration-bind-check-interval
powerdns-configuration-pipe-abi-version
powerdns-configuration-pipe-command
powerdns-configuration-pipe-timeout
powerdns-configuration-pipe-regex
powerdns-service-type))
(define pdns
(package
(name "pdns")
(version "4.6.2")
(source
(origin
(method url-fetch)
(uri (string-append "https://downloads.powerdns.com/releases/pdns-"
version ".tar.bz2"))
(sha256
(base32
"1f0r1gp64wx5rak1srzjxdzvbzq178xn2882hnsbn4dv8j4q8hzl"))))
(build-system gnu-build-system)
(arguments
(list #:configure-flags
#~(list "--disable-lua-records"
"--with-modules=bind"
(string-append "--sbindir="
(assoc-ref %outputs "out") "/bin"))))
(inputs
(list luajit openssl))
(native-inputs
(list boost pkg-config))
(home-page "https://www.powerdns.com/index.html")
(synopsis "Authoritative DNS name server")
(description "The PowerDNS Authoritative Server is a versatile nameserver
which supports a large number of backends. These backends can either be plain
zone files or be more dynamic in nature. PowerDNS backends are datastores
that the server will consult and contains DNS records (and some metadata).
The backends range from database backends (MySQL, PostgreSQL) and BIND zone
files to co-processes and JSON APIs. Multiple backends can be enabled in the
configuration. Each backend can be configured separately.")
(license (list license:gpl2 ; main license
;; ext/json11, ext/yahttp, src_js/d3.js, src_js/jquery.js,
;; src_js/moment.js, src_js/rickshaw.js
license:expat
;; ext/luawrapper
license:bsd-3))))
(define-record-type* <powerdns-configuration>
powerdns-configuration make-powerdns-configuration
powerdns-configuration?
(package powerdns-configuration-package
(default pdns))
(backends powerdns-configuration-backends
(default (list)))
(expand-alias? powerdns-configuration-expand-alias?
(default 'unset))
(local-address powerdns-configuration-local-address
(default #f))
(local-port powerdns-configuration-local-port
(default #f))
;; TODO: Reconsider unset for socket dir.
(socket-directory powerdns-configuration-socket-directory
(default "/var/run/powerdns"))
(resolver powerdns-configuration-resolver
(default #f))
(zone-cache-refresh-interval powerdns-configuration-zone-cache-refresh-interval
(default #f))
;; BIND backend configuration
(bind-config powerdns-configuration-bind-config
(default #f))
(bind-check-interval powerdns-configuration-bind-check-interval
(default #f))
;; Pipe backend configuration
(pipe-abi-version powerdns-configuration-pipe-abi-version
(default #f))
(pipe-command powerdns-configuration-pipe-command
(default #f))
(pipe-timeout powerdns-configuration-pipe-timeout
(default #f))
(pipe-regex powerdns-configuration-pipe-regex
(default #f)))
(define %powerdns-accounts
(list (user-account
(name "powerdns")
(group "powerdns")
(system? #t)
(comment "PowerDNS daemon user")
(home-directory "/var/empty")
(shell (file-append shadow "/sbin/nologin")))
(user-group
(name "powerdns")
(system? #t))))
(define (pdns-conf-gexp config)
(match config
(($ <powerdns-configuration> package backends expand-alias?
local-address local-port socket-directory
resolver zone-cache-refresh-interval
bind-config bind-check-interval
pipe-abi-version pipe-command
pipe-timeout pipe-regex)
(when (and (not (eq? expand-alias? 'unset))
expand-alias?
(not resolver))
(error "expand-alias? will be ignored without a resolver"))
(when (and (member "pipe" backends)
(not pipe-command))
(error "pipe-command is mandatory when pipe backend is used"))
#~(begin
(define (write-setting port key value)
"Write KEY=VALUE to PORT when VALUE is not #f."
(when value
(format port "~a=~a~%" key value)))
(call-with-output-file #$output
(lambda (port)
(write-setting port "setuid" "powerdns")
(write-setting port "setgid" "powerdns")
(write-setting port "launch" (and (not (null? '#$backends))
(string-join '#$backends ",")))
(write-setting port "expand-alias" #$(cond
((eq? expand-alias? 'unset) #f)
(expand-alias? "yes")
(else "no")))
(write-setting port "local-address" #$local-address)
(write-setting port "local-port" #$local-port)
(write-setting port "socket-dir" #$socket-directory)
(write-setting port "resolver" #$resolver)
(write-setting port "zone-cache-refresh-interval" #$zone-cache-refresh-interval)
;; BIND backend configuration
(write-setting port "bind-config" #$bind-config)
(write-setting port "bind-check-interval" #$bind-check-interval)
;; Pipe backend configuration
(write-setting port "pipe-abi-version" #$pipe-abi-version)
(write-setting port "pipe-command" #$pipe-command)
(write-setting port "pipe-timeout" #$pipe-timeout)
(write-setting port "pipe-regex" #$pipe-regex)))))))
(define (powerdns-activation config)
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils))
(let ((user (getpw "powerdns"))
(socket-directory #$(powerdns-configuration-socket-directory config)))
;; Create socket directory.
(mkdir-p socket-directory)
(chown socket-directory (passwd:uid user) (passwd:gid user))))))
(define (powerdns-shepherd-service config)
(shepherd-service
(documentation "Run PowerDNS authoritative name server.")
(provision '(powerdns))
(requirement '(networking))
(start #~(make-forkexec-constructor
(list #$(file-append (powerdns-configuration-package config)
"/bin/pdns_server")
(string-append
"--config-dir="
#$(file-union "powerdns"
`(("pdns.conf" ,(computed-file "pdns.conf"
(pdns-conf-gexp config)))))))
#:log-file "/var/log/pdns.log"))
(stop #~(make-kill-destructor))))
(define powerdns-service-type
(service-type
(name 'powerdns)
(description "Run PowerDNS authoritative name server.")
(extensions (list (service-extension account-service-type
(const %powerdns-accounts))
(service-extension activation-service-type
powerdns-activation)
(service-extension shepherd-root-service-type
(compose list powerdns-shepherd-service))))
(default-value (powerdns-configuration))))
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