import type { CallToolResult } from "@modelcontextprotocol/sdk/types";
export declare const VALID_HOSTNAME_PATTERN: RegExp;
export declare const VALID_TARGET_PATTERN: RegExp;
export declare const CIDR_PATTERN: RegExp;
/**
 * Validates an IP address (IPv4 or IPv6) using ipaddr.js
 * @param ip - The IP address string to validate
 * @returns true if valid, false otherwise
 */
export declare function isValidIPAddress(ip: string): boolean;
/**
 * Validates a CIDR notation string (e.g., "10.0.0.0/8" or "2001:db8::/32")
 * Uses ipaddr.js for proper validation including:
 * - IPv4 octets must be 0-255
 * - IPv6 segments must be valid hex
 * - IPv4 prefix length must be 0-32
 * - IPv6 prefix length must be 0-128
 *
 * @param cidr - The CIDR string to validate
 * @returns true if valid, false otherwise
 */
export declare function isValidCIDR(cidr: string): boolean;
export declare const DANGEROUS_CHARS: string[];
export declare function validateTarget(target: string): void;
export declare function validateStringInput(input: string, fieldName: string): void;
export declare function validateRoutes(routes: string[]): void;
export declare function getErrorMessage(error: unknown): string;
export declare function returnToolSuccess(message: string): CallToolResult;
export declare function returnToolError(error: unknown): CallToolResult;
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