Can specify MAC addresses for domains

virtweb_frontend/src/widgets/forms/MACInput.tsx

@@ -0,0 +1,46 @@
+import { TextInput } from "./TextInput";
+
+export function MACInput(p: {
+  label: string;
+  editable: boolean;
+  value?: string;
+  onValueChange?: (newVal: string | undefined) => void;
+}): React.ReactElement {
+  const { onValueChange, ...props } = p;
+  return (
+    <TextInput
+      onValueChange={(v) => {
+        onValueChange?.(sanitizeMacAddress(v));
+      }}
+      {...props}
+    />
+  );
+}
+
+function sanitizeMacAddress(s: string | undefined): string | undefined {
+  if (s === "" || s === undefined) return s;
+
+  const split = s.split(":");
+  if (split.length > 6) split.splice(6);
+
+  let needAnotherIteration = false;
+
+  const res = split
+    .map((e) => {
+      if (e === "") return e;
+
+      const num = parseInt(e, 16);
+      if (isNaN(num)) return "0";
+
+      let s = num.toString(16).padStart(2, "0");
+      if (num > 0xff) {
+        needAnotherIteration = true;
+        return s.slice(0, 2) + ":" + s.slice(2);
+      }
+
+      return s;
+    })
+    .join(":");
+
+  return needAnotherIteration ? sanitizeMacAddress(res) : res;
+}

virtweb_frontend/src/widgets/forms/VMNetworksList.tsx

@@ -14,6 +14,9 @@ import { VMInfo, VMNetInterface } from "../../api/VMApi";
 import { useConfirm } from "../../hooks/providers/ConfirmDialogProvider";
 import { SelectInput } from "./SelectInput";
 import { NetworkInfo } from "../../api/NetworksApi";
+import { randomMacAddress } from "../../utils/RandUtils";
+import { ServerApi } from "../../api/ServerApi";
+import { MACInput } from "./MACInput";
 
 export function VMNetworksList(p: {
   vm: VMInfo;
@@ -22,7 +25,10 @@ export function VMNetworksList(p: {
   networksList: NetworkInfo[];
 }): React.ReactElement {
   const addNew = () => {
-    p.vm.networks.push({ type: "UserspaceSLIRPStack" });
+    p.vm.networks.push({
+      type: "UserspaceSLIRPStack",
+      mac: randomMacAddress(ServerApi.Config.net_mac_prefix),
+    });
     p.onChange?.();
   };
 
@@ -120,6 +126,16 @@ function NetworkInfoWidget(p: {
         />
       </ListItem>
       <div style={{ marginLeft: "70px" }}>
+        <MACInput
+          editable={p.editable}
+          label="MAC Address"
+          value={p.network.mac}
+          onValueChange={(v) => {
+            p.network.mac = v!;
+            p.onChange?.();
+          }}
+        />
+
         {p.network.type === "DefinedNetwork" && (
           <SelectInput
             editable={p.editable}