socket.setTTL()方法是dgram模块中Socket类的内置应用程序编程接口,用于设置或清除IP_TTL套接字选项,该选项有助于指定允许数据包通过指定路由器或IP的行进IP跳数。网关。
用法:
const socket.setTTL( ttl )
参数:此方法采用整数值,该整数值表示允许数据包通过指定路由器或网关传播的IP跳数。
返回值:此方法不返回任何值。
范例1: 文件名:index.js
Javascript
// Node.js program to demonstrate the
// server.setTTL() method
// Importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
let broadcast_address = 12345;
// Cathing the message event
server.on("message", function (msg) {
// Displaying the client message
process.stdout.write("UDP String:" + msg + "\n");
// Exiting process
process.exit();
})
.bind(broadcast_address, () => {
// Enable the IP_TTL socket option
// and specifying the number of IP hopes
// by using the setTTL() method
server.setTTL(144);
});
// Client sending message to server
client.send("Hello", 0, 7, broadcast_address, "localhost");
输出:
UDP String:Hello
范例2: 文件名:index.js
Javascript
// Node.js program to demonstrate the
// server.setTTL() method
// Importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
// Cathing the message event
server.on("message", function (msg) {
// Displaying the client message
process.stdout.write("UDP String:" + msg + "\n");
// Exiting process
process.exit();
});
// Cathing the listening event
server.on('listening', () => {
const address = server.address();
console.log(`server listening
${address.address}:${address.port}`);
});
// Binding server with port address
server.bind(1234, () => {
// Enable the IP_TTL socket option
// and specifying the number of IP hopes
// by using the setTTL() method
server.setTTL(144);
});
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
server listening 0.0.0.0:1234 UDP String:Hello
使用以下命令运行index.js文件:
node index.js
参考:https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_setttl_ttl
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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js socket.setTTL() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。