Client can't connect to server in sbx sandbox #50533

Description

Summary

I am launching opencode in an sbx sandbox with the following command :

sbx run opencode . -- --hostname 0.0.0.0 --port 4096
Although the server binds to 0.0.0.0 fine, the client side fails to connect in the sandbox, with the error :

Error: dial tcp4 0.0.0.0:4096: connect: connection refused

at <anonymous> (/$bunfs/root/chunk-pf78enbq.js:8:7615)
at processTicksAndRejections (native:7:39)

I can replicate this in the sandbox with a separate opencode serve ... and opencode attach ... commands. the serve works fine, the attach fails with the same error.

The problem seems to be that the url that the client uses to connect is constructed from the passed hostname (0.0.0.0), and this is a non-routable address for connections.

Proposed fix

I suggest translating the wildcard bind address to a loopback address when the TUI worker returns the URL to its local client.

For example, in packages/opencode/src/cli/tui/worker.ts:

async server(input: { port: number; hostname: string; mdns?: boolean; cors?: string[] }) {
if (server) await server.stop(true)

server = await Server.listen(input)

const url = new URL(server.url)

if (input.hostname === "0.0.0.0") {
url.hostname = "127.0.0.1"
}

return { url: url.toString() }
}

Other Information

There seems to be similar logic in this code :

https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/cli/cmd/web.ts?utm_source=chatgpt.com#L49-L51

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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