34 lines
1.3 KiB
TypeScript
34 lines
1.3 KiB
TypeScript
/** Клиентские хелперы IPsec (зеркало чистых функций бэкенда). */
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function parseIpv4(s: string): number | null {
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const parts = s.trim().split(".")
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if (parts.length !== 4) return null
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const octets = parts.map((p) => Number(p))
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if (octets.some((o) => !Number.isInteger(o) || o < 0 || o > 255)) return null
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return (((octets[0]! << 24) | (octets[1]! << 16) | (octets[2]! << 8) | octets[3]!) >>> 0)
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}
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function intToIp(n: number): string {
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return [(n >>> 24) & 255, (n >>> 16) & 255, (n >>> 8) & 255, n & 255].join(".")
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}
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/** Первый свободный IP диапазона пула («a.b.c.d-a.b.c.e»), исключая занятые. */
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export function findFreePoolIp(range: string, taken: Iterable<string>): string | null {
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const takenSet = new Set(
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Array.from(taken, (t) => t.replace(/\/\d+$/, "").trim()),
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)
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const first = range.split(",").map((s) => s.trim()).filter(Boolean)[0] ?? ""
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const [fromRaw, toRaw] = first.split("-")
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const from = parseIpv4(fromRaw ?? "")
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const to = parseIpv4(toRaw ?? fromRaw ?? "")
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if (from == null) return null
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const last = to ?? from
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if (last < from) return null
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const cap = Math.min(last, from + 65_534)
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for (let n = from; n <= cap; n++) {
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const ip = intToIp(n)
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if (!takenSet.has(ip)) return ip
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}
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return null
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}
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