/**
 * Socket options (sockopt) configuration for Xray-Core.
 *
 * @see https://xtls.github.io/en/config/transport.html#sockoptobject
 */
export interface SocketConfig {
    /** SO_MARK value for outbound connections (Linux only). */
    mark?: number;
    /** Enable TCP Fast Open. true/false or integer queue length. */
    tcpFastOpen?: boolean | number;
    /** Transparent proxy mode (Linux only). */
    tproxy?: TProxyMode;
    /** Accept PROXY protocol on inbound connections. */
    acceptProxyProtocol?: boolean;
    /** Domain resolution strategy for this connection. */
    domainStrategy?: SockoptDomainStrategy;
    /** Tag of another outbound to use as dialer proxy. */
    dialerProxy?: string;
    /** TCP keep-alive probe interval in seconds. */
    tcpKeepAliveInterval?: number;
    /** TCP keep-alive idle time before first probe in seconds. */
    tcpKeepAliveIdle?: number;
    /** TCP congestion control algorithm (e.g. "bbr", "cubic"). */
    tcpCongestion?: string;
    /** TCP window clamp value. */
    tcpWindowClamp?: number;
    /** TCP maximum segment size. */
    tcpMaxSeg?: number;
    /** Enable NAT penetration mode. */
    penetrate?: boolean;
    /** TCP user timeout in milliseconds. */
    tcpUserTimeout?: number;
    /** Restrict to IPv6 only. */
    v6only?: boolean;
    /** Bind to specific network interface. */
    interface?: string;
    /** Enable Multipath TCP (MPTCP). */
    tcpMptcp?: boolean;
    /** Custom socket options (advanced). */
    customSockopt?: CustomSockoptConfig[];
    /** Address and port binding strategy. */
    addressPortStrategy?: string;
    /** Happy Eyeballs (RFC 8305) settings. */
    happyEyeballs?: HappyEyeballsConfig;
    /** Trusted X-Forwarded-For IP addresses. */
    trustedXForwardedFor?: string[];
}
export interface CustomSockoptConfig {
    /** System/OS type (e.g. "linux"). */
    system?: string;
    /** Network type (e.g. "tcp", "udp"). */
    network?: string;
    /** Socket option level (e.g. "SOL_SOCKET", "IPPROTO_TCP"). */
    level?: string;
    /** Socket option name (e.g. "SO_REUSEADDR"). */
    opt?: string;
    /** Socket option value. */
    value?: string;
    /** Value type (e.g. "int", "str"). */
    type?: string;
}
export interface HappyEyeballsConfig {
    /** Prefer IPv6 over IPv4. */
    prioritizeIPv6?: boolean;
    /** Delay in ms before trying next address family. */
    tryDelayMs?: number;
    /** Interleave factor for address sorting. */
    interleave?: number;
    /** Maximum concurrent connection attempts. */
    maxConcurrentTry?: number;
}
export type TProxyMode = 'off' | 'redirect' | 'tproxy';
export type SockoptDomainStrategy = 'AsIs' | 'UseIP' | 'UseIPv4' | 'UseIPv6' | 'UseIPv4v6' | 'UseIPv6v4' | 'ForceIP' | 'ForceIPv4' | 'ForceIPv6' | 'ForceIPv4v6' | 'ForceIPv6v4';
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