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fix: harden port listener detection

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This commit is contained in:
Peter Steinberger
2026-01-21 18:52:26 +00:00
parent 32550154f9
commit 403904ecd1
6 changed files with 139 additions and 21 deletions
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27
src/infra/ports-inspect.ts
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@@ -1,5 +1,6 @@
import net from "node:net";
import { runCommandWithTimeout } from "../process/exec.js";
import { resolveLsofCommand } from "./ports-lsof.js";
import { buildPortHints } from "./ports-format.js";
import type { PortListener, PortUsage, PortUsageStatus } from "./ports-types.js";
@@ -71,7 +72,8 @@ async function readUnixListeners(
port: number,
): Promise<{ listeners: PortListener[]; detail?: string; errors: string[] }> {
const errors: string[] = [];
const res = await runCommandSafe(["lsof", "-nP", `-iTCP:${port}`, "-sTCP:LISTEN", "-FpFcn"]);
const lsof = await resolveLsofCommand();
const res = await runCommandSafe([lsof, "-nP", `-iTCP:${port}`, "-sTCP:LISTEN", "-FpFcn"]);
if (res.code === 0) {
const listeners = parseLsofFieldOutput(res.stdout);
await Promise.all(
@@ -87,11 +89,12 @@ async function readUnixListeners(
);
return { listeners, detail: res.stdout.trim() || undefined, errors };
}
if (res.code === 1) {
const stderr = res.stderr.trim();
if (res.code === 1 && !res.error && !stderr) {
return { listeners: [], detail: undefined, errors };
}
if (res.error) errors.push(res.error);
const detail = [res.stderr.trim(), res.stdout.trim()].filter(Boolean).join("\n");
const detail = [stderr, res.stdout.trim()].filter(Boolean).join("\n");
if (detail) errors.push(detail);
return { listeners: [], detail: undefined, errors };
}
@@ -175,7 +178,7 @@ async function readWindowsListeners(
return { listeners, detail: res.stdout.trim() || undefined, errors };
}
async function checkPortInUse(port: number): Promise<PortUsageStatus> {
async function tryListenOnHost(port: number, host: string): Promise<PortUsageStatus | "skip"> {
try {
await new Promise<void>((resolve, reject) => {
const tester = net
@@ -184,15 +187,29 @@ async function checkPortInUse(port: number): Promise<PortUsageStatus> {
.once("listening", () => {
tester.close(() => resolve());
})
.listen(port);
.listen({ port, host, exclusive: true });
});
return "free";
} catch (err) {
if (isErrno(err) && err.code === "EADDRINUSE") return "busy";
if (isErrno(err) && (err.code === "EADDRNOTAVAIL" || err.code === "EAFNOSUPPORT")) {
return "skip";
}
return "unknown";
}
}
async function checkPortInUse(port: number): Promise<PortUsageStatus> {
const hosts = ["127.0.0.1", "0.0.0.0", "::1", "::"];
let sawUnknown = false;
for (const host of hosts) {
const result = await tryListenOnHost(port, host);
if (result === "busy") return "busy";
if (result === "unknown") sawUnknown = true;
}
return sawUnknown ? "unknown" : "free";
}
export async function inspectPortUsage(port: number): Promise<PortUsage> {
const errors: string[] = [];
const result =