sockets

How to connect to a remote Windows machine to execute commands using python?

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You can connect one computer to another computer in a network by using these two methods: Use WMI library. Netuse method. WMI Here is the example to connect using wmi module: ip = ‘192.168.1.13’ username=”username” password = ‘password’ from socket import * try: print(“Establishing connection to %s” %ip) connection = wmi.WMI(ip, user=username, password=password) print(“Connection established”) … Read more

How do I cleanly reconnect a boost::socket following a disconnect?

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You need to create a new boost::asio::ip::tcp::socket each time you reconnect. The easiest way to do this is probably to just allocate the socket on the heap using a boost::shared_ptr (you could probably also get away with scoped_ptr if your socket is entirely encapsulated within a class). E.g.: bool MyClient::myconnect() { bool isConnected = false; … Read more

Does closing the inputstream of a socket also close the socket connection?

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Yes, closing the input stream closes the socket. You need to use the shutdownInput method on socket, to close just the input stream: //do sth with fromSocket … and close it socket.shutdownInput(); Then, you can still send to the output socket //then write to socket again toSocket.print(“is socket connection still available?\r\n”); //close socket socket.close();

What is the actual impact of calling socket.recv with a bufsize that is not a power of 2?

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I’m pretty sure the ‘power of 2’ advice is based on an error in editing, and should not be taken as a requirement. That specific piece of advice was added to the Python 2.5 documentation (and backported to Python 2.4.3 docs), in response to Python issue #756104. The reporter was using an unreasonably large buffer … Read more

Failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED

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CONNECTION_REFUSED is standard when the port is closed, but it could be rejected because SSL is failing authentication (one of a billion reasons). Did you configure SSL with Ratchet? (Apache is bypassed) Did you try without SSL in JavaScript? I don’t think Ratchet has built-in support for SSL. But even if it does you’ll want … Read more

Efficient Linux sockets (DMA/zero-copy)

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There’s been some talk on linux-kernel recently about providing an API for something along these lines, but the sticking point is that you can’t DMA from general userspace buffers to the network card, because: What looks like contiguous data in the userspace linear address space is probably not-contiguous in physical memory, which is a problem … Read more

Is it possible to use port 80 for both HTTP and web socket traffic?

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YES, by using node.js. Express or connect for the HTTP file serving and socket.io for the WebSocket stuff. Example: var express = require(“express”); var app = express.createServer(); app.get(“https://stackoverflow.com/”, function(req, res){ res.redirect(“/index.html”); }); app.configure(function(){ app.use(express.static(__dirname + ‘/public’)); }); app.listen(80); var io = require(‘socket.io’); var socket = io.listen(app); socket.on(‘connection’, function(client){ client.on(‘message’, function(){…}); })

node.js – handling TCP socket error ECONNREFUSED

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I ran the following code: var net = require(‘net’); var client = net.connect(5558, ‘localhost’, function() { console.log(“bla”); }); client.on(‘error’, function(ex) { console.log(“handled error”); console.log(ex); }); As I do not have 5558 open, the output was: $ node test.js handled error { [Error: connect ECONNREFUSED] code: ‘ECONNREFUSED’, errno: ‘ECONNREFUSED’, syscall: ‘connect’ } This proves that the … Read more

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