From e88c2a806721c8a12ec6f16d78c723f3050f4eff Mon Sep 17 00:00:00 2001
From: Aminda Suomalainen <suomalainen+git@mikaela.info>
Date: Fri, 12 Apr 2024 09:52:32 +0300
Subject: [PATCH] etc: attempt to enable mDNS/LLMNR for
 systemd-{networkd,resolved} & NetworkManager

Some boolean fixing slipped in as well
---
 etc/NetworkManager/conf.d/mdns.conf          |  4 ++++
 etc/resolv.conf                              |  2 ++
 etc/systemd/network/10-ether.network         | 12 +++++++++---
 etc/systemd/network/10-wlan.network          | 10 ++++++++--
 etc/systemd/resolved.conf.d/00-defaults.conf |  4 ++++
 5 files changed, 27 insertions(+), 5 deletions(-)
 create mode 100644 etc/NetworkManager/conf.d/mdns.conf

diff --git a/etc/NetworkManager/conf.d/mdns.conf b/etc/NetworkManager/conf.d/mdns.conf
new file mode 100644
index 00000000..b6ec66ca
--- /dev/null
+++ b/etc/NetworkManager/conf.d/mdns.conf
@@ -0,0 +1,4 @@
+# Enables mDNS for systemd-resolved
+[connection]
+connection.mdns=2
+connection.llmnr=2
diff --git a/etc/resolv.conf b/etc/resolv.conf
index f313a7ad..fc304133 100644
--- a/etc/resolv.conf
+++ b/etc/resolv.conf
@@ -20,6 +20,8 @@ options rotate edns0 trust-ad
 
 # no sending local domain to upstream whenever NXDOMAIN happens
 search .
+# Attempt to mDNS everything?
+#search .local
 
 # PS. Remove empty lines and comments if this ends up in /etc/resolv.conf
 # PPS. The traditional spell is:
diff --git a/etc/systemd/network/10-ether.network b/etc/systemd/network/10-ether.network
index e8ad43e1..c313278a 100644
--- a/etc/systemd/network/10-ether.network
+++ b/etc/systemd/network/10-ether.network
@@ -7,14 +7,16 @@ Type=ether
 [Link]
 # My devices generally also have WiFi so lack of ethernet is not a reason
 # to wait for systemd-networkd-wait-online.service
-RequiredForOnline=no
+RequiredForOnline=false
 # Takes "ipv4", "ipv6", "both", or "any" (default).
 RequiredFamilyForOnline=both
-# Always set administrative state to up. Implies RequiredForOnline=yes
+# Always set administrative state to up. Implies RequiredForOnline=true
 #ActivationPolicy=always-up
+# Required for mDNS
+Multicast=true
 
 [Network]
-#DHCP=yes
+#DHCP=true
 # /24, /16, /8 are the the class C, B, A networks
 Address=192.168.0.2/24
 Gateway=192.168.0.1
@@ -30,3 +32,7 @@ IPv6LinkLocalAddressGenerationMode=stable-privacy
 # multiple times, but you are using Chrony instead, right?
 #NTP=fi.pool.ntp.org
 #NTP=time.cloudflare.com
+# Enable mDNS/.local for systemd-resolved
+MulticastDNS=true
+# Windows
+LLMNR=true
diff --git a/etc/systemd/network/10-wlan.network b/etc/systemd/network/10-wlan.network
index 7ddc8e46..839ce67a 100644
--- a/etc/systemd/network/10-wlan.network
+++ b/etc/systemd/network/10-wlan.network
@@ -7,13 +7,19 @@ Type=wlan
 [Link]
 # Takes "ipv4", "ipv6", "both", or "any" (default).
 RequiredFamilyForOnline=both
-# Always set administrative state to up. Implies RequiredForOnline=yes
+# Always set administrative state to up. Implies RequiredForOnline=true
 ActivationPolicy=always-up
 # If something else (like iwd EnableNetworkConfiguration=true) manages network,
 # uncomment
 #Unmanaged=true
+# Required for mDNS
+Multicast=true
 
 [Network]
-DHCP=yes
+DHCP=true
 IPv6PrivacyExtensions=true
 IPv6LinkLocalAddressGenerationMode=stable-privacy
+# Enable mDNS/.local for systemd-resolved
+MulticastDNS=true
+# Windows
+LLMNR=true
diff --git a/etc/systemd/resolved.conf.d/00-defaults.conf b/etc/systemd/resolved.conf.d/00-defaults.conf
index 8856629f..0cb7b64e 100644
--- a/etc/systemd/resolved.conf.d/00-defaults.conf
+++ b/etc/systemd/resolved.conf.d/00-defaults.conf
@@ -10,3 +10,7 @@ Cache=true
 DNS=127.0.0.1
 DNS=::1
 Domains=~.
+# .local domains
+MulticastDNS=true
+# Microsoft Windows compatibility?
+LLMNR=true