我需要与 smtp 服务器建立 tcp 套接字连接。是否可以通过nodejs上的代理服务器连接?有可用的 npm 模块吗?我根本没找到。
var net = require('net');
var HOST = '127.0.0.1';
var PORT = 6969;
var client = new net.Socket();
client.connect(PORT, HOST, function() {
console.log('CONNECTED TO: ' + HOST + ':' + PORT);
client.write('I am here!');
});
// Add a 'data' event handler for the client socket
// data is what the server sent to this socket
client.on('data', function(data) {
console.log('DATA: ' + data);
});
// Add a 'close' event handler for the client socket
client.on('close', function() {
console.log('Connection closed');
});
net.socket
、tls.connect
和 dgram
没有代理支持。
将其与代理一起使用的最简单方法是将一些 libc 函数替换为
proxychains
或类似的东西。
var client = require('tls')
.connect(443, 'www.facebook.com', function() {
console.log('connected');
client.write('hello');
})
.on('data', function(data) {
console.log('received', data.toString());
})
.on('close', function() {
console.log('closed');
});
代理链节点 fit.js
connected
received HTTP/1.1 400 Bad Request
...
closed
除了“net”之外,只要代理服务器支持 HTTPS 流量,您不需要另一个模块来使套接字通过代理服务器连接到主机。
尽管此过程以 HTTP 开始,但这并不意味着它不适用于 SMTP 流量。初始 HTTP 消息仅用于协商连接,之后只是原始流量。代理服务器可能会查看您想要连接的端口或主机并禁止它。例如,阻止与低于 80 或低于 443 的端口(例如端口 25)的连接,因此是否允许连接实际上取决于代理服务器。
我将this文章改造成更现代的东西,它只使用NodeJS中内置的
net
包。
const net = require('net')
class ProxyClient {
constructor(config) {
this.config = config
}
async setup() {
const { proxyClient } = this.config
if (!proxyClient) {
return
}
const { localPort, remoteHost, remotePort } = proxyClient
console.info(`[ProxyClient] Starting ODBC proxy to ${remoteHost}:${remotePort} on local port ${localPort}...`)
console.info('[ProxyClient] Opening service socket to remote host...')
const serviceSocket = await new Promise(resolve => {
const socket = new net.Socket()
socket.connect(remotePort, remoteHost, () => resolve(socket))
})
console.info('[ProxyClient] Service socket to remote host opened.')
console.info('[ProxyClient] Creating the local proxy server...')
await new Promise(resolve => {
const server = net.createServer(proxyServerSocket => {
proxyServerSocket.on('data', message => {
serviceSocket.write(message)
})
serviceSocket.on('data', message => {
proxyServerSocket.write(message)
})
})
server.listen(localPort, '0.0.0.0', () => resolve())
})
console.info('[ProxyClient] Local proxy server created.')
console.info(`[ProxyClient] ODBC proxy to ${remoteHost}:${remotePort} on local port ${localPort} started successfully.`)
}
}
module.exports = ProxyClient
是的,可以使用以下 NPM 模块之一:
http-proxy-agent:HTTP 端点的 HTTP 代理 http.Agent 实现
https-proxy-agent:HTTPS 端点的 HTTP(s) 代理 http.Agent 实现
pac-proxy-agent:HTTP 和 HTTPS 的 PAC 文件代理 http.Agent 实现
socks-proxy-agent:HTTP 和 HTTPS 的 SOCKS (v4a) 代理 http.Agent 实现
HTTPS 代理示例:
var url = require('url');
var WebSocket = require('ws');
var HttpsProxyAgent = require('https-proxy-agent');
// HTTP/HTTPS proxy to connect to
var proxy = process.env.http_proxy || 'http://168.63.76.32:3128';
console.log('using proxy server %j', proxy);
// WebSocket endpoint for the proxy to connect to
var endpoint = process.argv[2] || 'ws://echo.websocket.org';
var parsed = url.parse(endpoint);
console.log('attempting to connect to WebSocket %j', endpoint);
// create an instance of the `HttpsProxyAgent` class with the proxy server information
var opts = url.parse(proxy);
var agent = new HttpsProxyAgent(opts);
// finally, initiate the WebSocket connection
var socket = new WebSocket(endpoint, { agent: agent });
socket.on('open', function () {
console.log('"open" event!');
socket.send('hello world');
});
socket.on('message', function (data, flags) {
console.log('"message" event! %j %j', data, flags);
socket.close();
});
我希望这有帮助。