53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
import os from "node:os";
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export type TailnetAddresses = {
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ipv4: string[];
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ipv6: string[];
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};
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function isTailnetIPv4(address: string): boolean {
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const parts = address.split(".");
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if (parts.length !== 4) return false;
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const octets = parts.map((p) => Number.parseInt(p, 10));
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if (octets.some((n) => !Number.isFinite(n) || n < 0 || n > 255)) return false;
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// Tailscale IPv4 range: 100.64.0.0/10
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// https://tailscale.com/kb/1015/100.x-addresses
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const [a, b] = octets;
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return a === 100 && b >= 64 && b <= 127;
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}
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function isTailnetIPv6(address: string): boolean {
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// Tailscale IPv6 ULA prefix: fd7a:115c:a1e0::/48
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// (stable across tailnets; nodes get per-device suffixes)
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const normalized = address.trim().toLowerCase();
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return normalized.startsWith("fd7a:115c:a1e0:");
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}
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export function listTailnetAddresses(): TailnetAddresses {
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const ipv4: string[] = [];
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const ipv6: string[] = [];
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const ifaces = os.networkInterfaces();
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for (const entries of Object.values(ifaces)) {
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if (!entries) continue;
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for (const e of entries) {
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if (!e || e.internal) continue;
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const address = e.address?.trim();
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if (!address) continue;
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if (isTailnetIPv4(address)) ipv4.push(address);
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if (isTailnetIPv6(address)) ipv6.push(address);
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}
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}
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return { ipv4: [...new Set(ipv4)], ipv6: [...new Set(ipv6)] };
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}
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export function pickPrimaryTailnetIPv4(): string | undefined {
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return listTailnetAddresses().ipv4[0];
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}
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export function pickPrimaryTailnetIPv6(): string | undefined {
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return listTailnetAddresses().ipv6[0];
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}
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