GNU bug report logs - #75934
[PATCH] services: networking: Add dhcpcd service.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#75934: closed ([PATCH] services: networking: Add dhcpcd service.)
Date: Sat, 08 Mar 2025 15:11:02 +0000

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Your message dated Sat, 08 Mar 2025 16:10:42 +0100
with message-id <877c4zv9ql.fsf <at> gnu.org>
and subject line Re: [bug#75934] [PATCH v2] services: networking: Add dhcpcd service.
has caused the debbugs.gnu.org bug report #75934,
regarding [PATCH] services: networking: Add dhcpcd service.
to be marked as done.

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75934: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=75934
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From: soeren <at> soeren-tempel.net
To: guix-patches <at> gnu.org
Cc: Quelln <at> protonmail.com, ludo <at> gnu.org
Subject: [PATCH] services: networking: Add dhcpcd service.
Date: Wed, 29 Jan 2025 21:45:22 +0100

From: Sören Tempel <soeren <at> soeren-tempel.net>

This is intended as an alternative to dhcp-client-service-type as
isc-dhcp has reached its end-of-life in 2022 (three years ago!),
see #68619 for more details.  Long-term, this services is therefore
intended to replace dhcp-client-service-type.

* gnu/services/networking.scm (dhcpcd-service-type): New service.
(dhcpcd-shepherd-service): New procedure.
(dhcpcd-account-service): New variable.
(dhcpcd-config-file): New procedure.
(dhcpcd-configuration): New record type.
(dhcpcd-serialize-list-of-strings, dhcpcd-serialize-boolean)
(dhcpcd-serialize-string): New procedures.
* gnu/tests/networking.scm (run-dhcpcd-test): New procedure.
(%dhcpcd-os, %test-dhcpcd): New variables.
* doc/guix.texi (Networking Services): Document it.
---
Previously, an integration into the dhcp-client-service-type was
attempted.  However, the discussion there established that a new
entirely separate service would be a better fit.

See https://issues.guix.gnu.org/68675 for the prior discussion.

 doc/guix.texi               |  57 ++++++++++++++
 gnu/services/networking.scm | 147 ++++++++++++++++++++++++++++++++++++
 gnu/tests/networking.scm    | 106 ++++++++++++++++++++++++++
 3 files changed, 310 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index b1b6d98e74..6f51d1e1f6 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -21468,6 +21468,63 @@ which provides the @code{networking} Shepherd service.
 @end table
 @end deftp
 
+@cindex DHCPCD, networking service
+
+@defvar dhcpcd-service-type
+This is a service which runs @var{dhcpcd}, an alternative Dynamic
+Host Configuration Protocol (DHCP) client.
+@end defvar
+
+@deftp {Data Type} dhcpcd-configuration
+Available @code{dhcpcd-configuration} fields are:
+
+@table @asis
+@item @code{interfaces} (default: @code{()}) (type: list)
+List of interfaces to start a DHCP client for.
+
+@item @code{command-args} (default: @code{("-q" "-q")}) (type: list)
+List of additional command-line options.
+
+@item @code{hostname} (default: @code{""}) (type: maybe-string)
+Hostname to send via DHCP, defaults to the current system hostname.
+
+@item @code{duid} (default: @code{""}) (type: maybe-string)
+Use and generate a DHCP Unique Identifier.
+
+@item @code{persistent} (default: @code{#t}) (type: boolean)
+Do not de-configure on shutdown.
+
+@item @code{option} (default: @code{("rapid_commit" "domain_name_servers" "domain_name" "domain_search" "host_name" "classless_static_routes" "interface_mtu")}) (type: list-of-strings)
+List of options to request from the server.
+
+@item @code{require} (default: @code{("dhcp_server_identifier")}) (type: list-of-strings)
+List of options to require in responses.
+
+@item @code{slaac} (default: @code{"private"}) (type: maybe-string)
+Interface identifier used for SLAAC generated IPv6 addresses.
+
+@item @code{nooption} (default: @code{()}) (type: list-of-strings)
+List of options to remove from the message before it's processed.
+
+@item @code{nohook} (default: @code{()}) (type: list-of-strings)
+List of hook script which should not be invoked.
+
+@item @code{static} (default: @code{()}) (type: list-of-strings)
+Configure a static value (e.g.  ip_address).
+
+@item @code{vendorclassid} (type: maybe-string)
+Set the DHCP Vendor Class.
+
+@item @code{clientid} (type: maybe-string)
+Use the interface hardware address or the given string as a Client ID.
+
+@item @code{extra-content} (type: maybe-string)
+Extra content to append to the configuration as-is.
+
+@end table
+@end deftp
+
+
 @cindex NetworkManager
 
 @defvar network-manager-service-type
diff --git a/gnu/services/networking.scm b/gnu/services/networking.scm
index af28bd0626..c97d50eccf 100644
--- a/gnu/services/networking.scm
+++ b/gnu/services/networking.scm
@@ -108,6 +108,24 @@ (define-module (gnu services networking)
             dhcpd-configuration-pid-file
             dhcpd-configuration-interfaces
 
+            dhcpcd-service-type
+            dhcpcd-configuration
+            dhcpcd-configuration?
+            dhcpcd-configuration-interfaces
+            dhcpcd-configuration-command-args
+            dhcpcd-configuration-hostname
+            dhcpcd-configuration-duid
+            dhcpcd-configuration-persistent
+            dhcpcd-configuration-option
+            dhcpcd-configuration-require
+            dhcpcd-configuration-slaac
+            dhcpcd-configuration-nooption
+            dhcpcd-configuration-nohook
+            dhcpcd-configuration-static
+            dhcpcd-configuration-vendorclassid
+            dhcpcd-configuration-clientid
+            dhcpcd-configuration-extra-content
+
             ntp-configuration
             ntp-configuration?
             ntp-configuration-ntp
@@ -491,6 +509,135 @@ (define dhcpd-service-type
    (description "Run a DHCP (Dynamic Host Configuration Protocol) daemon.  The
 daemon is responsible for allocating IP addresses to its client.")))
 
+
+;;
+;; DHCPCD.
+;;
+
+(define (dhcpcd-serialize-string field-name value)
+  (let ((field (object->string field-name)))
+    (if (string=? field "extra-content")
+      #~(string-append #$value "\n")
+      #~(format #f "~a ~a~%" #$field #$value))))
+
+(define (dhcpcd-serialize-boolean field-name value)
+  (if value
+    #~(format #f "~a~%" #$(object->string field-name))
+    ""))
+
+(define (dhcpcd-serialize-list-of-strings field-name value)
+  #~(string-append #$@(map (cut dhcpcd-serialize-string field-name <>) value)))
+
+;; Some fields (e.g. hostname) can be specified with an empty string argument.
+;; Therefore, we need a maybe type to differentiate disabled/empty-string.
+(define-maybe string (prefix dhcpcd-))
+
+(define-configuration dhcpcd-configuration
+  (interfaces
+    (list '())
+    "List of interfaces to start a DHCP client for."
+    empty-serializer)
+  (command-args
+    (list '("-q" "-q"))
+    "List of additional command-line options."
+    empty-serializer)
+
+  ;; The following defaults replicate the default dhcpcd configuration file.
+  ;;
+  ;; See https://github.com/NetworkConfiguration/dhcpcd/tree/v10.0.10#configuration
+  (hostname
+    (maybe-string "")
+    "Hostname to send via DHCP, defaults to the current system hostname.")
+  (duid
+    (maybe-string "")
+    "Use and generate a DHCP Unique Identifier.")
+  (persistent
+    (boolean #t)
+    "Do not de-configure on shutdown.")
+  (option
+    (list-of-strings
+      '("rapid_commit"
+        "domain_name_servers"
+        "domain_name"
+        "domain_search"
+        "host_name"
+        "classless_static_routes"
+        "interface_mtu"))
+    "List of options to request from the server.")
+  (require
+    (list-of-strings '("dhcp_server_identifier"))
+    "List of options to require in responses.")
+  (slaac
+    (maybe-string "private")
+    "Interface identifier used for SLAAC generated IPv6 addresses.")
+
+  ;; Common options not set in the default configuration file.
+  (nooption
+    (list-of-strings '())
+    "List of options to remove from the message before it's processed.")
+  (nohook
+    (list-of-strings '())
+    "List of hook script which should not be invoked.")
+  (static
+    (list-of-strings '())
+    "Configure a static value (e.g. ip_address).")
+  (vendorclassid
+    maybe-string
+    "Set the DHCP Vendor Class.")
+  (clientid
+    maybe-string
+    "Use the interface hardware address or the given string as a Client ID.")
+
+  ;; Escape hatch for the generated configuration file.
+  (extra-content
+    maybe-string
+    "Extra content to append to the configuration as-is.")
+
+  (prefix dhcpcd-))
+
+(define (dhcpcd-config-file config)
+  (mixed-text-file "dhcpcd.conf"
+    (serialize-configuration
+      config
+      dhcpcd-configuration-fields)))
+
+(define dhcpcd-account-service
+  (list (user-group (name "dhcpcd") (system? #t))
+        (user-account
+          (name "dhcpcd")
+          (group "dhcpcd")
+          (system? #t)
+          (comment "dhcpcd daemon user")
+          (home-directory "/var/empty")
+          (shell (file-append shadow "/sbin/nologin")))))
+
+(define (dhcpcd-shepherd-service config)
+  (let* ((config-file (dhcpcd-config-file config))
+         (command-args (dhcpcd-configuration-command-args config))
+         (ifaces (dhcpcd-configuration-interfaces config)))
+    (list (shepherd-service
+            (documentation "dhcpcd daemon.")
+            (provision '(networking))
+            (requirement '(user-processes udev))
+            (actions (list (shepherd-configuration-action config-file)))
+            (start
+              #~(lambda _
+                  (fork+exec-command
+                    (list (string-append #$dhcpcd "/sbin/dhcpcd")
+                          #$@command-args "-B" "-f" #$config-file #$@ifaces))))
+            (stop #~(make-kill-destructor))))))
+
+(define dhcpcd-service-type
+  (service-type (name 'dhcpcd)
+                (description "Run the dhcpcd daemon.")
+                (extensions
+                 (list (service-extension account-service-type
+                                          (const dhcpcd-account-service))
+                       (service-extension shepherd-root-service-type
+                                          dhcpcd-shepherd-service)))
+                (compose concatenate)
+                (default-value (dhcpcd-configuration))))
+
 
 ;;;
 ;;; NTP.
diff --git a/gnu/tests/networking.scm b/gnu/tests/networking.scm
index e7c02b9e00..720f123953 100644
--- a/gnu/tests/networking.scm
+++ b/gnu/tests/networking.scm
@@ -32,6 +32,7 @@ (define-module (gnu tests networking)
   #:use-module (guix store)
   #:use-module (guix monads)
   #:use-module (guix modules)
+  #:use-module (gnu packages admin)
   #:use-module (gnu packages bash)
   #:use-module (gnu packages linux)
   #:use-module (gnu packages networking)
@@ -44,6 +45,7 @@ (define-module (gnu tests networking)
             %test-inetd
             %test-openvswitch
             %test-dhcpd
+            %test-dhcpcd
             %test-tor
             %test-iptables
             %test-ipfs))
@@ -673,6 +675,110 @@ (define %test-dhcpd
    (description "Test a running DHCP daemon configuration.")
    (value (run-dhcpd-test))))
 
+
+;;;
+;;; DHCPCD Daemon
+;;;
+
+(define %dhcpcd-os
+  (let ((base-os
+          (simple-operating-system
+            (service dhcpcd-service-type
+                     (dhcpcd-configuration
+                       (command-args '("--debug" "--logfile" "/dev/console"))
+                       (interfaces '("ens3")))))))
+    (operating-system
+      (inherit base-os)
+      (packages
+        (append (list dhcpcd iproute)
+                (operating-system-packages base-os))))))
+
+(define (run-dhcpcd-test)
+  "Run tests in %dhcpcd-os with a running dhcpcd daemon on localhost."
+  (define os
+    (marionette-operating-system
+     %dhcpcd-os
+     #:imported-modules '((gnu services herd))))
+
+  (define vm
+    (virtual-machine os))
+
+  (define test
+    (with-imported-modules '((gnu build marionette))
+      #~(begin
+          (use-modules (srfi srfi-64)
+                       (gnu build marionette))
+          (define marionette
+            (make-marionette (list #$vm)))
+
+          (define (wait-for-lease)
+            (marionette-eval
+              '(begin
+                 (use-modules (ice-9 popen) (ice-9 rdelim))
+
+                 (let loop ((i 15))
+                   (if (> i 0)
+                     (let* ((port (open-input-pipe "dhcpcd --dumplease ens3"))
+                            (output (read-string port)))
+                       (close-port port)
+                       (unless (string-contains output "reason=BOUND")
+                         (sleep 1)
+                         (loop (- i 1))))
+                     (error "failed to obtain a DHCP lease"))))
+              marionette))
+
+          (test-runner-current (system-test-runner #$output))
+          (test-begin "dhcpcd")
+
+          (test-assert "service is running"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+
+                ;; Make sure the 'dhcpcd' command is found.
+                (setenv "PATH" "/run/current-system/profile/sbin")
+
+                (wait-for-service 'networking))
+             marionette))
+
+          (test-assert "IPC socket exists"
+            (marionette-eval
+              '(file-exists? "/var/run/dhcpcd/ens3.sock")
+              marionette))
+
+          (test-equal "IPC is functional"
+            0
+            (marionette-eval
+              '(status:exit-val
+                 (system* "dhcpcd" "--dumplease" "ens3"))
+              marionette))
+
+          (test-equal "aquires IPv4 address via DHCP"
+            1
+            (and
+              (wait-for-lease)
+              (marionette-eval
+                '(begin
+                   (use-modules (ice-9 popen) (ice-9 rdelim))
+
+                   (let* ((port  (open-input-pipe "ip -4 address show dev ens3"))
+                          (lines (string-split (read-string port) #\newline)))
+                     (close-port port)
+                     (length
+                       (filter (lambda (line)
+                                 (string-contains line "scope global dynamic"))
+                               lines))))
+                marionette)))
+
+          (test-end))))
+  (gexp->derivation "dhcpcd-test" test))
+
+(define %test-dhcpcd
+  (system-test
+   (name "dhcpcd")
+   (description "Test that the dhcpcd obtains IP DHCP leases.")
+   (value (run-dhcpcd-test))))
+
 
 ;;;
 ;;; Services related to Tor

[Message part 3 (message/rfc822, inline)]

From: Ludovic Courtès <ludo <at> gnu.org>
To: soeren <at> soeren-tempel.net
Cc: 75934-done <at> debbugs.gnu.org, Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Subject: Re: [bug#75934] [PATCH v2] services: networking: Add dhcpcd service.
Date: Sat, 08 Mar 2025 16:10:42 +0100

Hello Sören,

soeren <at> soeren-tempel.net skribis:

> From: Sören Tempel <soeren <at> soeren-tempel.net>
>
> This is intended as an alternative to dhcp-client-service-type as
> isc-dhcp has reached its end-of-life in 2022 (three years ago!),
> see #68619 for more details.  Long-term, this services is therefore
> intended to replace dhcp-client-service-type.
>
> * gnu/services/networking.scm (dhcpcd-service-type): New service.
> (dhcpcd-shepherd-service): New procedure.
> (dhcpcd-account-service): New variable.
> (dhcpcd-config-file): New procedure.
> (dhcpcd-configuration): New record type.
> (dhcpcd-serialize-list-of-strings, dhcpcd-serialize-boolean)
> (dhcpcd-serialize-string): New procedures.
> (serialize-field-name): New procedure.
> * gnu/tests/networking.scm (run-dhcpcd-test): New procedure.
> (%dhcpcd-os, %test-dhcpcd): New variables.
> * doc/guix.texi (Networking Services): Document it.
> ---
> Change since v1:
>
> * Expand documentation and include a larger configuration example
> * Improve record type by hyphening record field names
> * Use make-forkexec-constructor in shepherd service
> * Fix indention of if expression

Great.  Applied, thanks!

Ludo'.

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