From 39bf15289ca10ff5b61eb4070292ffb13f53e94e Mon Sep 17 00:00:00 2001
From: sarthurdev <965089+sarthurdev@users.noreply.github.com>
Date: Tue, 9 Jan 2024 22:44:16 +0100
Subject: dhcp: T3316: Workaround to append domain suffix to hostfile entries

---
 src/system/on-dhcp-event.sh | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'src')

diff --git a/src/system/on-dhcp-event.sh b/src/system/on-dhcp-event.sh
index 3534fe601..e1a9f1884 100755
--- a/src/system/on-dhcp-event.sh
+++ b/src/system/on-dhcp-event.sh
@@ -17,6 +17,32 @@ fi
 action=$1
 hostsd_client="/usr/bin/vyos-hostsd-client"
 
+get_subnet_domain_name () {
+  python3 <<EOF
+from vyos.kea import kea_get_active_config
+from vyos.utils.dict import dict_search_args
+
+config = kea_get_active_config('4')
+shared_networks = dict_search_args(config, 'arguments', f'Dhcp4', 'shared-networks')
+
+found = False
+
+if shared_networks:
+  for network in shared_networks:
+    for subnet in network[f'subnet4']:
+      if subnet['id'] == $1:
+        for option in subnet['option-data']:
+          if option['name'] == 'domain-name':
+            print(option['data'])
+            found = True
+
+        if not found:
+          for option in network['option-data']:
+            if option['name'] == 'domain-name':
+              print(option['data'])
+EOF
+}
+
 case "$action" in
   lease4_renew|lease4_recover)
     exit 0
@@ -45,6 +71,12 @@ case "$action" in
           client_name=$(echo "host-$client_mac" | tr : -)
       fi
 
+      client_domain=$(get_subnet_domain_name $client_subnet_id)
+
+      if [ -n "$client_domain" ]; then
+        client_name="$client_name.$client_domain"
+      fi
+
       $hostsd_client --add-hosts "$client_name,$client_ip" --tag "dhcp-server-$client_ip" --apply
     done
 
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