[bug#52689] [PATCH] services: wireguard: Add DNS config field.

[Nathan Dehnel]

From: Nathan Dehnel <5498361+Gooberpatrol66@users.noreply.github.com>

* gnu/services/vpn.scm (wireguard-configuration): Add dns field
* doc/guix.texi: Document dns field
---
 doc/guix.texi        |  3 +++
 gnu/services/vpn.scm | 11 +++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index aca88cdada..8e9cd8df18 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -28601,6 +28601,9 @@ The IP addresses to be assigned to the above interface.
 @item @code{port} (default: @code{51820})
 The port on which to listen for incoming connections.
 
+@item @code{dns} (default: @code{#f})
+The DNS server(s) to announce to VPN clients via DHCP.
+
 @item @code{private-key} (default: @code{"/etc/wireguard/private.key"})
 The private key file for the interface.  It is automatically generated if
 the file does not exist.
diff --git a/gnu/services/vpn.scm b/gnu/services/vpn.scm
index 6004e41d8d..1a8f2c8d6a 100644
--- a/gnu/services/vpn.scm
+++ b/gnu/services/vpn.scm
@@ -67,6 +67,7 @@ (define-module (gnu services vpn)
             wireguard-configuration-interface
             wireguard-configuration-addresses
             wireguard-configuration-port
+            wireguard-configuration-dns
             wireguard-configuration-private-key
             wireguard-configuration-peers
 
@@ -715,7 +716,9 @@ (define-record-type* <wireguard-configuration>
   (private-key        wireguard-configuration-private-key ;string
                       (default "/etc/wireguard/private.key"))
   (peers              wireguard-configuration-peers ;list of <wiregard-peer>
-                      (default '())))
+                      (default '()))
+  (dns                wireguard-configuration-dns ;string
+                      (default #f)))
 
 (define (wireguard-configuration-file config)
   (define (peer->config peer)
@@ -739,7 +742,7 @@ (define (peer->config peer)
                   "\n"))))
 
   (match-record config <wireguard-configuration>
-    (wireguard interface addresses port private-key peers)
+    (wireguard interface addresses port private-key peers dns)
     (let* ((config-file (string-append interface ".conf"))
            (peers (map peer->config peers))
            (config
@@ -755,6 +758,7 @@ (define (peer->config peer)
 Address = ~a
 PostUp = ~a set %i private-key ~a
 ~a
+~a
 ~{~a~^~%~}"
                                #$(string-join addresses ",")
                                #$(file-append wireguard "/bin/wg")
@@ -762,6 +766,9 @@ (define (peer->config peer)
                                #$(if port
                                      (format #f "ListenPort = ~a" port)
                                      "")
+                               #$(if dns
+                                     (format #f "DNS = ~a" (string-join dns 
","))
+                                     "")
                                (list #$@peers)))))))))
       (file-append config "/" config-file))))
 
-- 
2.33.1