/**
 * URL Validation Utilities (SMI-721, SMI-729)
 *
 * SSRF prevention validators for URL access.
 *
 * Security Features:
 * - Protocol validation (http/https only)
 * - Private IPv4 range blocking
 * - Private IPv6 range blocking
 * - Localhost and loopback blocking
 */
/**
 * Get human-readable IP range name for error messages
 */
export declare function getIpRangeName(a: number, b: number): string;
/**
 * Validate IPv6 address to prevent SSRF attacks (SMI-729)
 *
 * Blocks:
 * - Link-local: fe80::/10
 * - Unique local addresses (ULA): fc00::/7
 * - Multicast: ff00::/8
 * - IPv4-mapped IPv6: ::ffff:0:0/96
 * - Loopback ::1 (already blocked above)
 *
 * @param hostname - IPv6 hostname to validate
 * @param url - Full URL for error context
 * @throws {ValidationError} if IPv6 address is not allowed
 */
export declare function validateIPv6(hostname: string, url: string): void;
/**
 * Validate URL to prevent SSRF attacks (SMI-721, SMI-729)
 *
 * Blocks:
 * - Non-http(s) protocols
 * - Private IPv4 ranges (10.x, 172.16-31.x, 192.168.x)
 * - Private IPv6 ranges (fe80::/10, fc00::/7, ff00::/8, ::ffff:0:0/96)
 * - Localhost variants (127.x, localhost, ::1, 0.0.0.0)
 * - Link-local addresses (169.254.x, fe80::/10)
 * - Current network (0.x)
 *
 * @param url - URL to validate
 * @throws {ValidationError} if URL is not allowed
 *
 * @example
 * ```typescript
 * validateUrl('https://example.com/api')  // OK
 * validateUrl('http://localhost:3000')    // Throws ValidationError
 * validateUrl('ftp://example.com')        // Throws ValidationError
 * validateUrl('http://192.168.1.1')       // Throws ValidationError
 * validateUrl('http://[fe80::1]')         // Throws ValidationError (IPv6 link-local)
 * ```
 */
export declare function validateUrl(url: string): void;
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