feat(server): add --mdns-domain flag to customize mDNS hostname (#11796)

5 files changed, 21 insertions, 6 deletions

diff --git a/packages/opencode/src/cli/cmd/web.ts b/packages/opencode/src/cli/cmd/web.ts
index 5fa2bb426..0fe056f21 100644
--- a/packages/opencode/src/cli/cmd/web.ts
+++ b/packages/opencode/src/cli/cmd/web.ts
@@ -63,7 +63,7 @@ export const WebCommand = cmd({
         UI.println(
           UI.Style.TEXT_INFO_BOLD + "  mDNS:              ",
           UI.Style.TEXT_NORMAL,
-          `opencode.local:${server.port}`,
+          `${opts.mdnsDomain}:${server.port}`,
         )
       }
 
diff --git a/packages/opencode/src/cli/network.ts b/packages/opencode/src/cli/network.ts
index fe5731d07..dd09e1689 100644
--- a/packages/opencode/src/cli/network.ts
+++ b/packages/opencode/src/cli/network.ts
@@ -17,6 +17,11 @@ const options = {
     describe: "enable mDNS service discovery (defaults hostname to 0.0.0.0)",
     default: false,
   },
+  "mdns-domain": {
+    type: "string" as const,
+    describe: "custom domain name for mDNS service (default: opencode.local)",
+    default: "opencode.local",
+  },
   cors: {
     type: "string" as const,
     array: true,
@@ -36,9 +41,11 @@ export async function resolveNetworkOptions(args: NetworkOptions) {
   const portExplicitlySet = process.argv.includes("--port")
   const hostnameExplicitlySet = process.argv.includes("--hostname")
   const mdnsExplicitlySet = process.argv.includes("--mdns")
+  const mdnsDomainExplicitlySet = process.argv.includes("--mdns-domain")
   const corsExplicitlySet = process.argv.includes("--cors")
 
   const mdns = mdnsExplicitlySet ? args.mdns : (config?.server?.mdns ?? args.mdns)
+  const mdnsDomain = mdnsDomainExplicitlySet ? args["mdns-domain"] : (config?.server?.mdnsDomain ?? args["mdns-domain"])
   const port = portExplicitlySet ? args.port : (config?.server?.port ?? args.port)
   const hostname = hostnameExplicitlySet
     ? args.hostname
@@ -49,5 +56,5 @@ export async function resolveNetworkOptions(args: NetworkOptions) {
   const argsCors = Array.isArray(args.cors) ? args.cors : args.cors ? [args.cors] : []
   const cors = [...configCors, ...argsCors]
 
-  return { hostname, port, mdns, cors }
+  return { hostname, port, mdns, mdnsDomain, cors }
 }
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index b0164e8aa..54ca94ae4 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -860,6 +860,7 @@ export namespace Config {
       port: z.number().int().positive().optional().describe("Port to listen on"),
       hostname: z.string().optional().describe("Hostname to listen on"),
       mdns: z.boolean().optional().describe("Enable mDNS service discovery"),
+      mdnsDomain: z.string().optional().describe("Custom domain name for mDNS service (default: opencode.local)"),
       cors: z.array(z.string()).optional().describe("Additional domains to allow for CORS"),
     })
     .strict()
diff --git a/packages/opencode/src/server/mdns.ts b/packages/opencode/src/server/mdns.ts
index 953269de4..778afa26a 100644
--- a/packages/opencode/src/server/mdns.ts
+++ b/packages/opencode/src/server/mdns.ts
@@ -7,17 +7,18 @@ export namespace MDNS {
   let bonjour: Bonjour | undefined
   let currentPort: number | undefined
 
-  export function publish(port: number) {
+  export function publish(port: number, domain?: string) {
     if (currentPort === port) return
     if (bonjour) unpublish()
 
     try {
+      const host = domain ?? "opencode.local"
       const name = `opencode-${port}`
       bonjour = new Bonjour()
       const service = bonjour.publish({
         name,
         type: "http",
-        host: "opencode.local",
+        host,
         port,
         txt: { path: "/" },
       })
diff --git a/packages/opencode/src/server/server.ts b/packages/opencode/src/server/server.ts
index f6dd0d122..015553802 100644
--- a/packages/opencode/src/server/server.ts
+++ b/packages/opencode/src/server/server.ts
@@ -563,7 +563,13 @@ export namespace Server {
     return result
   }
 
-  export function listen(opts: { port: number; hostname: string; mdns?: boolean; cors?: string[] }) {
+  export function listen(opts: {
+    port: number
+    hostname: string
+    mdns?: boolean
+    mdnsDomain?: string
+    cors?: string[]
+  }) {
     _corsWhitelist = opts.cors ?? []
 
     const args = {
@@ -591,7 +597,7 @@ export namespace Server {
       opts.hostname !== "localhost" &&
       opts.hostname !== "::1"
     if (shouldPublishMDNS) {
-      MDNS.publish(server.port!)
+      MDNS.publish(server.port!, opts.mdnsDomain)
     } else if (opts.mdns) {
       log.warn("mDNS enabled but hostname is loopback; skipping mDNS publish")
     }