如何在Node JS中的特定接口上打开套接字？

I want to know how it is possible to open simply a socket on a specific interface (eth0, wlan0, ...) in Node JS.

我想知道如何在Node JS中的特定接口（eth0，wlan0，...）上打开一个套接字。

It seems to be possible in C and possible also with ping command with ping -I eth0 google.com.

它似乎可以在C中使用ping -I eth0 google.com的ping命令。

But how to do that with Node JS ? I have seen nothing in net.Socket documentation.

但是如何使用Node JS做到这一点？我在net.Socket文档中没有看到任何内容。

I have found some code that wrap dynamic library but there should be a easier way to do that. No ? Something like socket.connect({host :"google.com", port:80, interface:"eth0"});

我找到了一些包装动态库的代码，但应该有一种更简单的方法。不是吗？像socket.connect（{host：“google.com”，port：80，interface：“eth0”}）;

1 个解决方案

#1

net.Socket.connect(options[, connectListener]) accepts localAddress parameter which specifies what address the socket should connect from. Each your physical interface has exactly one IP address attached to it*. So the proper way would be to determine an IP address of the interface you'd like to use and use the IP in connect call.

net.Socket.connect（options [，connectListener]）接受localAddress参数，该参数指定套接字应从哪个地址连接。每个物理接口都只有一个IP地址*。因此，正确的方法是确定您要使用的接口的IP地址，并在连接呼叫中使用IP。

socket.connect({
    host: "google.com",
    port: 80,
    localAddress: somehowGetIPv4AddrOfInterface("eth0"),
 });

The OS will then determine the interface (eth0 in this case). A bit cumbersome, but it is a usual pattern to avoid dealing with lower level addresses when a higher level is available.

然后操作系统将确定接口（在这种情况下为eth0）。有点麻烦，但是当更高级别可用时，这是避免处理较低级别地址的通常模式。

* - a little bit more if IPv6 is also configured, but this is rarely a problem.

* - 如果还配置了IPv6，可以多一点，但这很少是一个问题。

#1

socket.connect({
    host: "google.com",
    port: 80,
    localAddress: somehowGetIPv4AddrOfInterface("eth0"),
 });