How to setsockopt under node.js?

Question

Is there a setsockopt/getsockopt-like socket options manipulation functionality in node.js?

Answer 1

I'm expanding on the comment left by socketpair which shows getsockopt. You can accomplish this by using ffi and ref. I've reformatted this to allow it to be easily manipulated.

I edited my comment because I had to make some changes to make the code work on both Linux and Win32. I had to create a node library for Windows to get the socket handle and pass it to setsockopt. Be aware that Linux and Windows may have different values for socket options

Edit: Here's a cleaned up piece of of production code I'm using:

var net = require("net");
var ffi = require("ffi");
var ref = require("ref");
var getSocketHandleAddress;

var SOL_SOCKET = 0x1;
var SO_OOBINLINE = 0xA;
var _setsockopt;

if (process.platform == "win32") {
  SOL_SOCKET = 0xffff;
  SO_OOBINLINE = 0x0100;
}

var setSocketOption = function (handle, level, option, value) {
  if (!_setsockopt) {
    var library;
    var paramTypes;
    if (process.platform === "win32") {
      library = "ws2_32.dll";
      paramTypes = [
        ref.types.int,
        ref.types.int,
        ref.types.int,
        ref.refType(ref.types.void),
        ref.types.int
      ];
    } else {
      paramTypes = [
        ref.types.int,
        ref.types.int,
        ref.types.int,
        ref.refType(ref.types.void),
        ref.refType(ref.types.int)
      ];
    }
    var lib = new ffi.DynamicLibrary(library);
    _setsockopt = ffi.ForeignFunction(
      lib.get("setsockopt"),
      ref.types.int,
      paramTypes);
  }
  var refType;
  var length;
  if (typeof value === "boolean") {
    refType = ref.types.bool;
  } else {
    refType = ref.types.int;
  }
  if (process.platform !== "win32") {
    return _setsockopt(
      handle.fd, 
      level, 
      option, 
      ref.alloc(refType, value), 
      ref.alloc(ref.types.int, refType.size)
    );
  }
  if (!getSocketHandleAddress) {
    getSocketHandleAddress = require("getsockethandleaddress");
  }
  return _setsockopt(
    getSocketHandleAddress.getAddress(handle),
    level,
    option,
    ref.alloc(refType, value), 
    refType.size
  );

};

var tcpserver = net.createServer(function (socket) {
  var ret = setSocketOption(socket._handle, SOL_SOCKET, SO_OOBINLINE, true);
  if (ret !== 0) {
    console.error("OOB Inline socket option failed: " + ret);
  }
});