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\"\",\n\t\taddress: node.TailscaleIPs.find((ip) => isIP(ip) === 4) ?? node.TailscaleIPs[0]!,\n\t};\n}\n\nasync function status(): Promise {\n\ttry {\n\t\tconst value = await run([\"status\", \"--json\"]) as Status;\n\t\treturn value.BackendState === \"Running\" ? value : undefined;\n\t} catch {\n\t\treturn undefined;\n\t}\n}\n\n/** This machine on the tailnet, or nothing when Tailscale is not running. */\nexport async function self(): Promise {\n\tconst value = await status();\n\treturn value && machine(value.Self, value);\n}\n\nexport async function diagnostics(): Promise {\n\tif (!binary) return { state: \"missing\" };\n\ttry {\n\t\tconst value = await run([\"status\", \"--json\"]) as Status;\n\t\tif (value.BackendState !== \"Running\") return { state: \"offline\" };\n\t\treturn { state: \"running\", name: machine(value.Self, value).name };\n\t} catch (error) {\n\t\treturn { state: \"error\", error: (error as Error).message };\n\t}\n}\n\n/** Online machines owned by people; tagged nodes are servers, not participants. */\nexport async function peers(): Promise {\n\tconst value = await status();\n\tif (!value) return [];\n\treturn Object.values(value.Peer ?? {})\n\t\t.filter((node) => node.Online && !node.Tags?.length)\n\t\t.map((node) => machine(node, value));\n}\n\n/** Only CGNAT and ULA tailnet addresses; anything else did not arrive over Tailscale. */\nexport function tailnet(ip: string): string | undefined {\n\tconst plain = ip.replace(/^::ffff:/, \"\");\n\tif (isIP(plain) === 4) {\n\t\tconst [a, b] = plain.split(\".\").map(Number);\n\t\treturn a === 100 && b! >= 64 && b! <= 127 ? plain : undefined;\n\t}\n\treturn plain.toLowerCase().startsWith(\"fd7a:115c:a1e0:\") ? plain : undefined;\n}\n\n/** A certificate for this machine's MagicDNS name, when the tailnet has HTTPS enabled. */\nexport async function certificate(\n\tdns: string,\n\tdir: string,\n): Promise<{ cert: string; key: string }> {\n\tif (!binary) throw new Error(\"Tailscale is not installed\");\n\tconst cert = join(dir, \"tailnet.crt\");\n\tconst key = join(dir, \"tailnet.key\");\n\tconst child = Bun.spawn([binary, \"cert\", \"--cert-file\", cert, \"--key-file\", key, dns], {\n\t\tenv: options().env,\n\t\tstdout: \"ignore\",\n\t\tstderr: \"pipe\",\n\t});\n\tconst [error, code] = await Promise.all([new Response(child.stderr).text(), child.exited]);\n\tif (code !== 0) throw new Error(error.trim().split(\"\\n\").at(-1) || \"tailscale cert failed\");\n\treturn { cert, key };\n}\n\n/** The person behind an inbound TCP connection, as Tailscale verified it. 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