core: implement gateway validation for DHCP and static networks

Add validation for gateway settings based on network type.
2026-06-15 20:11:19 +02:00 · 2026-06-15 09:09:48 +02:00
1 changed files with 14 additions and 0 deletions
@@ -979,6 +979,20 @@ base_settings() {

  IPV6_METHOD=${var_ipv6_method:-"none"}
  GATE=${var_gateway:-""}
+
+  # Guard against invalid gateway combinations from defaults/app vars:
+  # - DHCP must not force a static gateway
+  # - Static IPv4 must use a gateway in the same subnet
+  if [[ "$NET" == "dhcp" && -n "$GATE" ]]; then
+    msg_warn "Ignoring var_gateway '$GATE' because var_net is 'dhcp'"
+    GATE=""
+  elif [[ "$NET" != "dhcp" && -n "$GATE" ]]; then
+    if ! validate_gateway_in_subnet "$NET" "$GATE"; then
+      msg_warn "Ignoring var_gateway '$GATE' because it is not in subnet of var_net '$NET'"
+      GATE=""
+    fi
+  fi
+
  APT_CACHER=${var_apt_cacher:-""}
  APT_CACHER_IP=${var_apt_cacher_ip:-""}