services: Add ddclient service.
* gnu/services/dns.scm (ddclient-configuration, ddclient-service-type): New variables. (uglify-field-name, serialize-field, serialize-boolean, serialize-integer, serialize-string, serialize-list, serialize-extra-options, ddclient-activation, ddclient-shepherd-service, generate-ddclient-documentation): New procedures. * doc/guix.texi (DNS Services): Document it.master
Oleg Pykhalov
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doc/guix.texi
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doc/guix.texi
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@ -17263,6 +17263,114 @@ When false, disable negative caching.
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@end table
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@end deftp
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@subsubheading ddclient Service
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@cindex ddclient
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The ddclient service described below runs the ddclient daemon, which takes
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care of automatically updating DNS entries for service providers such as
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@uref{https://dyn.com/dns/, Dyn}.
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The following example show instantiates the service with its default
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configuration:
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@example
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(service ddclient-service-type)
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@end example
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Note that ddclient needs to access credentials that are stored in a
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@dfn{secret file}, by default @file{/etc/ddclient/secrets} (see
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@code{secret-file} below.) You are expected to create this file manually, in
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an ``out-of-band'' fashion (you @emph{could} make this file part of the
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service configuration, for instance by using @code{plain-file}, but it will be
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world-readable @i{via} @file{/gnu/store}.) See the examples in the
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@file{share/ddclient} directory of the @code{ddclient} package.
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@c %start of fragment
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Available @code{ddclient-configuration} fields are:
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@deftypevr {@code{ddclient-configuration} parameter} package ddclient
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The ddclient package.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} integer daemon
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The period after which ddclient will retry to check IP and domain name.
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Defaults to @samp{300}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} boolean syslog
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Use syslog for the output.
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Defaults to @samp{#t}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} string mail
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Mail to user.
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Defaults to @samp{"root"}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} string mail-failure
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Mail failed update to user.
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Defaults to @samp{"root"}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} string pid
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The ddclient PID file.
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Defaults to @samp{"/var/run/ddclient/ddclient.pid"}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} boolean ssl
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Enable SSL support.
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Defaults to @samp{#t}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} string user
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Specifies the user name or ID that is used when running ddclient
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program.
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Defaults to @samp{"ddclient"}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} string group
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Group of the user who will run the ddclient program.
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Defaults to @samp{"ddclient"}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} string secret-file
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Secret file which will be appended to @file{ddclient.conf} file. This
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file contains credentials for use by ddclient. You are expected to
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create it manually.
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Defaults to @samp{"/etc/ddclient/secrets.conf"}.
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@end deftypevr
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@deftypevr {@code{ddclient-configuration} parameter} list extra-options
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Extra options will be appended to @file{ddclient.conf} file.
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Defaults to @samp{()}.
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@end deftypevr
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@c %end of fragment
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@node VPN Services
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@subsubsection VPN Services
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@cindex VPN (virtual private network)
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@ -1,5 +1,6 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu>
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;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -45,7 +46,10 @@
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zone-entry
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dnsmasq-service-type
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dnsmasq-configuration))
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dnsmasq-configuration
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ddclient-service-type
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ddclient-configuration))
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;;;
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;;; Knot DNS.
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@ -670,3 +674,165 @@
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(compose list dnsmasq-shepherd-service))))
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(default-value (dnsmasq-configuration))
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(description "Run the dnsmasq DNS server.")))
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;;;
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;;; ddclient
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;;;
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(define (uglify-field-name field-name)
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(string-delete #\? (symbol->string field-name)))
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(define (serialize-field field-name val)
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(format #t "~a=~a\n" (uglify-field-name field-name) val))
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(define (serialize-boolean field-name val)
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(serialize-field field-name (if val "yes" "no")))
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(define (serialize-integer field-name val)
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(serialize-field field-name (number->string val)))
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(define (serialize-string field-name val)
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(if (and (string? val) (string=? val ""))
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""
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(serialize-field field-name val)))
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(define (serialize-list field-name val)
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(if (null? val) "" (serialize-field field-name (string-join val))))
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(define (serialize-extra-options extra-options)
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(string-join extra-options "\n" 'suffix))
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(define-configuration ddclient-configuration
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(ddclient
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(package ddclient)
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"The ddclient package.")
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(daemon
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(integer 300)
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"The period after which ddclient will retry to check IP and domain name.")
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(syslog
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(boolean #t)
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"Use syslog for the output.")
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(mail
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(string "root")
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"Mail to user.")
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(mail-failure
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(string "root")
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"Mail failed update to user.")
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(pid
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(string "/var/run/ddclient/ddclient.pid")
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"The ddclient PID file.")
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(ssl
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(boolean #t)
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"Enable SSL support.")
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(user
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(string "ddclient")
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"Specifies the user name or ID that is used when running ddclient
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program.")
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(group
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(string "ddclient")
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"Group of the user who will run the ddclient program.")
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(secret-file
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(string "/etc/ddclient/secrets.conf")
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"Secret file which will be appended to @file{ddclient.conf} file. This
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file contains credentials for use by ddclient. You are expected to create it
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manually.")
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(extra-options
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(list '())
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"Extra options will be appended to @file{ddclient.conf} file."))
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(define (ddclient-account config)
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"Return the user accounts and user groups for CONFIG."
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(let ((ddclient-user (ddclient-configuration-user config))
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(ddclient-group (ddclient-configuration-group config)))
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(list (user-group
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(name ddclient-group)
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(system? #t))
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(user-account
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(name ddclient-user)
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(system? #t)
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(group ddclient-group)
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(comment "ddclientd privilege separation user")
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(home-directory (string-append "/var/run/" ddclient-user))))))
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(define (ddclient-activation config)
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"Return the activation GEXP for CONFIG."
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(with-imported-modules '((guix build utils)
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(ice-9 rdelim))
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#~(begin
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(use-modules (guix build utils)
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(ice-9 rdelim))
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(let ((ddclient-user
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#$(passwd:uid (getpw (ddclient-configuration-user config))))
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(ddclient-group
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#$(passwd:gid (getpw (ddclient-configuration-group config))))
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(ddclient-secret-file
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#$(ddclient-configuration-secret-file config)))
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;; 'ddclient' complains about ddclient.conf file permissions, which
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;; rules out /gnu/store. Thus we copy the ddclient.conf to /etc.
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(for-each (lambda (dir)
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(mkdir-p dir)
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(chmod dir #o700)
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(chown dir ddclient-user ddclient-group))
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'("/var/cache/ddclient" "/var/run/ddclient"
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"/etc/ddclient"))
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(with-output-to-file "/etc/ddclient/ddclient.conf"
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(lambda ()
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(display
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(string-append
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"# Generated by 'ddclient-service'.\n\n"
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#$(with-output-to-string
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(lambda ()
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(serialize-configuration config
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ddclient-configuration-fields)))
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(if (string-null? ddclient-secret-file)
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""
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(format #f "\n\n# Appended from '~a'.\n\n~a"
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ddclient-secret-file
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(with-input-from-file ddclient-secret-file
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read-string)))))))
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(chmod "/etc/ddclient/ddclient.conf" #o600)
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(chown "/etc/ddclient/ddclient.conf"
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ddclient-user ddclient-group)))))
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(define (ddclient-shepherd-service config)
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"Return a <shepherd-service> for ddclient with CONFIG."
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(let ((ddclient (ddclient-configuration-ddclient config))
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(ddclient-pid (ddclient-configuration-pid config))
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(ddclient-user (ddclient-configuration-user config))
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(ddclient-group (ddclient-configuration-group config)))
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(list (shepherd-service
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(provision '(ddclient))
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(documentation "Run ddclient daemon.")
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(start #~(make-forkexec-constructor
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(list #$(file-append ddclient "/bin/ddclient")
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"-foreground"
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"-file" "/etc/ddclient/ddclient.conf")
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#:pid-file #$ddclient-pid
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#:environment-variables
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(list "SSL_CERT_DIR=/run/current-system/profile\
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/etc/ssl/certs"
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"SSL_CERT_FILE=/run/current-system/profile\
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/etc/ssl/certs/ca-certificates.crt")
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#:user #$ddclient-user
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#:group #$ddclient-group))
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(stop #~(make-kill-destructor))))))
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(define ddclient-service-type
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(service-type
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(name 'ddclient)
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(extensions
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(list (service-extension account-service-type
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ddclient-account)
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(service-extension shepherd-root-service-type
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ddclient-shepherd-service)
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(service-extension activation-service-type
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ddclient-activation)))
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(default-value (ddclient-configuration))
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(description "Configure address updating utility for dynamic DNS services,
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ddclient.")))
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(define (generate-ddclient-documentation)
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(generate-documentation
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`((ddclient-configuration ,ddclient-configuration-fields))
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'ddclient-configuration))
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