bux-lang/lib/Net.bux

module Std::Net {
    extern func bux_socket_create() -> int;
    extern func bux_socket_reuse(fd: int) -> int;
    extern func bux_socket_bind(fd: int, addr: String, port: int) -> int;
    extern func bux_socket_listen(fd: int, backlog: int) -> int;
    extern func bux_socket_accept(fd: int) -> int;
    extern func bux_socket_connect(fd: int, addr: String, port: int) -> int;
    extern func bux_socket_send(fd: int, data: String, len: int) -> int;
    extern func bux_socket_recv(fd: int, maxLen: int) -> String;
    extern func bux_socket_close(fd: int) -> int;
    extern func bux_socket_error() -> String;

    // TLS server (OpenSSL) — opaque SSL_CTX* / SSL* as *void
    extern func bux_tls_server_ctx(certPath: String, keyPath: String) -> *void;
    extern func bux_tls_server_ctx_ex(certPath: String, keyPath: String, clientCaPath: String) -> *void;
    extern func bux_tls_ctx_free(ctx: *void);
    extern func bux_tls_accept(ctx: *void, fd: int) -> *void;
    extern func bux_tls_send(ssl: *void, data: String, len: int) -> int;
    extern func bux_tls_recv(ssl: *void, maxLen: int) -> String;
    extern func bux_tls_close(ssl: *void);
    extern func bux_tls_error() -> String;

    /* Create a TCP socket. Returns -1 on error. */
    func Net_Create() -> int {
        return bux_socket_create();
    }

    /* Enable SO_REUSEADDR on a socket. */
    func Net_SetReuse(fd: int) -> bool {
        return bux_socket_reuse(fd) == 0;
    }

    /* Bind a socket to an address and port. */
    func Net_Bind(fd: int, addr: String, port: int) -> bool {
        return bux_socket_bind(fd, addr, port) == 0;
    }

    /* Start listening for connections. */
    func Net_Listen(fd: int, backlog: int) -> bool {
        return bux_socket_listen(fd, backlog) == 0;
    }

    /* Accept a connection. Returns new fd or -1 on error. */
    func Net_Accept(fd: int) -> int {
        return bux_socket_accept(fd);
    }

    /* Connect to a remote address and port. */
    func Net_Connect(fd: int, addr: String, port: int) -> bool {
        return bux_socket_connect(fd, addr, port) == 0;
    }

    /* Send data. Returns bytes sent or -1 on error. */
    func Net_Send(fd: int, data: String) -> int {
        return bux_socket_send(fd, data, bux_strlen(data) as int);
    }

    /* Receive up to maxLen bytes. Returns empty string on error/EOF. */
    func Net_Recv(fd: int, maxLen: int) -> String {
        return bux_socket_recv(fd, maxLen);
    }

    /* Close a socket. */
    func Net_Close(fd: int) -> bool {
        return bux_socket_close(fd) == 0;
    }

    /* Get last socket error as a string. */
    func Net_LastError() -> String {
        return bux_socket_error();
    }

    // ── TLS server (session 78) ──────────────────────────────────────────

    /// Load PEM cert+key into a server SSL context. null on failure.
    func Tls_ServerCtx(certPath: String, keyPath: String) -> *void {
        return bux_tls_server_ctx(certPath, keyPath);
    }

    /// Server TLS + mTLS: require client certs signed by `clientCaPath` PEM.
    func Tls_ServerCtxMtls(certPath: String, keyPath: String, clientCaPath: String) -> *void {
        return bux_tls_server_ctx_ex(certPath, keyPath, clientCaPath);
    }

    func Tls_CtxFree(ctx: *void) {
        bux_tls_ctx_free(ctx);
    }

    /// Handshake on an accepted TCP fd. Returns SSL handle or null.
    func Tls_Accept(ctx: *void, fd: int) -> *void {
        return bux_tls_accept(ctx, fd);
    }

    func Tls_Send(ssl: *void, data: String) -> int {
        return bux_tls_send(ssl, data, bux_strlen(data) as int);
    }

    func Tls_Recv(ssl: *void, maxLen: int) -> String {
        return bux_tls_recv(ssl, maxLen);
    }

    /// Free SSL handle only (caller still closes the TCP fd).
    func Tls_Close(ssl: *void) {
        bux_tls_close(ssl);
    }

    func Tls_LastError() -> String {
        return bux_tls_error();
    }
}