fix: publish host IP in AD DNS

setup

@@ -57,6 +57,45 @@ sanitize_sam_account_name() {
   printf '%s' "${cleaned_name:0:20}"
 }
 
+parse_route_source_ip() {
+  local route="$1"
+  local previous=""
+  local token
+
+  for token in $route; do
+    if [[ "$previous" == "src" ]]; then
+      printf '%s\n' "$token"
+      return 0
+    fi
+    previous="$token"
+  done
+
+  return 1
+}
+
+detect_ad_dns_ip() {
+  local lookup_name="$1"
+  local target_ip=""
+  local route=""
+
+  if ! command -v ip >/dev/null 2>&1; then
+    return 1
+  fi
+
+  if [[ -n "$lookup_name" ]] && command -v getent >/dev/null 2>&1; then
+    while read -r target_ip _; do
+      if [[ ! "$target_ip" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; then
+        continue
+      fi
+      route="$(ip -o -4 route get "$target_ip" 2>/dev/null || true)"
+      parse_route_source_ip "$route" && return 0
+    done < <(getent ahostsv4 "$lookup_name" 2>/dev/null)
+  fi
+
+  route="$(ip -o -4 route get 1.1.1.1 2>/dev/null || true)"
+  parse_route_source_ip "$route"
+}
+
 prompt_value() {
   local var_name="$1"
   local prompt_text="$2"
@@ -92,11 +131,17 @@ write_env_file() {
   local backup_retention_yearly="1"
   local samba_hostname="adsambafsrv"
   local netbios_name="ADSAMBAFSRV"
+  local ad_dns_ip=""
+  local ad_dns_name=""
+  local ad_dns_ip_auto="0"
   local service_password=""
   local service_account_sam=""
   local fslogix_group_prompt=""
   local samba_hostname_input=""
   local netbios_name_input=""
+  local ad_dns_ip_input=""
+  local ad_dns_name_input=""
+  local detected_ad_dns_ip=""
   local sanitized_netbios_name=""
 
   prompt_value realm "REALM (e.g. EXAMPLE.COM)"
@@ -128,6 +173,25 @@ write_env_file() {
   fi
   netbios_name="$sanitized_netbios_name"
 
+  detected_ad_dns_ip="$(detect_ad_dns_ip "$domain" || true)"
+  if [[ -n "$detected_ad_dns_ip" ]]; then
+    read -r -p "AD_DNS_IP (host LAN IP to publish in AD DNS) [${detected_ad_dns_ip}]: " ad_dns_ip_input
+    if [[ -n "$ad_dns_ip_input" ]]; then
+      ad_dns_ip="$ad_dns_ip_input"
+    else
+      ad_dns_ip="$detected_ad_dns_ip"
+      ad_dns_ip_auto="1"
+    fi
+  else
+    prompt_value ad_dns_ip "AD_DNS_IP (host LAN IP to publish in AD DNS)"
+  fi
+
+  ad_dns_name="${samba_hostname}.${domain}"
+  read -r -p "AD_DNS_NAME [${ad_dns_name}]: " ad_dns_name_input
+  if [[ -n "$ad_dns_name_input" ]]; then
+    ad_dns_name="$ad_dns_name_input"
+  fi
+
   read -r -p "BACKUP_DESTINATION (optional URL, press Enter to disable): " backup_destination
   read -r -p "BACKUP_START_HOUR [2]: " backup_start_hour
   backup_start_hour="${backup_start_hour:-2}"
@@ -176,6 +240,9 @@ SERVICE_ACCOUNT_PASSWORD=${service_password}
 DOMAIN_USERS_SID=${domain_users_sid}
 DOMAIN_ADMINS_SID=${domain_admins_sid}
 FSLOGIX_GROUP_SID=${fslogix_group_sid}
+AD_DNS_IP=${ad_dns_ip}
+AD_DNS_NAME=${ad_dns_name}
+AD_DNS_IP_AUTO=${ad_dns_ip_auto}
 BACKUP_DESTINATION=${backup_destination}
 BACKUP_START_HOUR=${backup_start_hour}
 BACKUP_RETENTION_DAILY=${backup_retention_daily}
@@ -233,6 +300,9 @@ JOIN_PASSWORD=${service_password}
 DOMAIN_USERS_SID=${domain_users_sid}
 DOMAIN_ADMINS_SID=${domain_admins_sid}
 FSLOGIX_GROUP_SID=${fslogix_group_sid}
+AD_DNS_IP=${ad_dns_ip}
+AD_DNS_NAME=${ad_dns_name}
+AD_DNS_IP_AUTO=${ad_dns_ip_auto}
 BACKUP_DESTINATION=${backup_destination}
 BACKUP_START_HOUR=${backup_start_hour}
 BACKUP_RETENTION_DAILY=${backup_retention_daily}