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iCloud Private Relay hides iPhones' real public IP, breaking IP-based LAN grouping. Devices now detect their local IP (192.168.x.x) via WebRTC ICE candidates and send it to the server. The server groups devices by local subnet as a fallback when public IPs differ. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
53 lines
1.3 KiB
TypeScript
53 lines
1.3 KiB
TypeScript
/**
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* Detect the local LAN IP (192.168.x.x, 10.x.x.x, 172.16-31.x.x)
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* using WebRTC ICE candidate gathering.
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*
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* Returns the first private IPv4 found, or undefined if none detected
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* (e.g. browser blocks mDNS candidates).
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*/
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export async function detectLocalIP(timeoutMs = 3000): Promise<string | undefined> {
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return new Promise((resolve) => {
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let resolved = false;
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const done = (ip?: string) => {
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if (resolved) return;
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resolved = true;
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pc.close();
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clearTimeout(timer);
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resolve(ip);
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};
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const timer = setTimeout(() => done(undefined), timeoutMs);
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const pc = new RTCPeerConnection({
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iceServers: [{ urls: "stun:stun.l.google.com:19302" }],
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});
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pc.createDataChannel("");
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pc.onicecandidate = (event) => {
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if (!event.candidate?.candidate) return;
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const match = event.candidate.candidate.match(
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/(?:srflx|host)\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s/,
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);
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if (match) {
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const ip = match[1];
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if (isPrivateIPv4(ip)) {
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done(ip);
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}
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}
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};
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pc.createOffer()
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.then((offer) => pc.setLocalDescription(offer))
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.catch(() => done(undefined));
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});
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}
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function isPrivateIPv4(ip: string): boolean {
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return (
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ip.startsWith("192.168.") ||
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ip.startsWith("10.") ||
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/^172\.(1[6-9]|2\d|3[01])\./.test(ip)
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);
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}
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