I'm developing an application that detects Source-based games running on the LAN. Following up on the specifications provided by Valve, I have it narrowed down to exactly what I want: making a UDP connection on port 27015, sending an A2S_INFO query (0xFFFFFFFF followed by "TSource Engine Query") and parsing the binary reply. This is the...
According to this post, UDP just doesn't block. Are there any advantage using the (non-blocking) NIO API for UDP? Or should I just use the easier "traditional" io API? ...
I have some code that listens for "announcements" via UDP multicast. I can get the IP address of the sender, but what I really need is the MAC address of the sender (since the IP address can and will change). Is there an easy way to do this in Python? A code snippet is included for reference, but likely unnecessary. sock = socket.sock...
I am trying to setup a simple UDP client and server using Ruby. The code looks like this: require 'socket.so' class UDPServer def initialize(port) @port = port end def start @socket = UDPSocket.new @socket.bind(nil, @port) # is nil OK here? while true packet = @socket.recvfrom(1024) puts packet en...
I currently have a small Python script that I'm using to spawn multiple executables, (voice chat servers), and in the next version of the software, the servers have the ability to receive heartbeat signals on the UDP port. (There will be possibly thousands of servers on one machine, ranging from ports 7878 and up) My problem is that the...
I have been trying to do this in ms visual studio 2008 using the winsock2 package but whenever i try to resolve the input ip address, which is valid, I get an "Invalid ip..." error. My only guess is that there is some permissions error, but I really have no clue whats wrong. Please help! if(WSAStartup(MAKEWORD(2,2), &wsaData) != 0){ ...
Hello, I am trying to implement a function using boost asio udpSocket, that waits until data is ready to be read, or waits until a timeout expires. using asyc_read and a async_wait, I can do something similar, but I have to read the data. I would like to do the same without reading the data This would allow a much easier use of the ud...
Do you think that Twisted Spread may be suitable (in terms of performance) for a multiplayer racing simulator? The rest of the application is based on Python-Ogre. Can Perspective Broker run upon (reliable?) UDP? ...
Hi, I'm attempting to send multichannel audio over WiFi from one server to multiple client computers using UDP broadcast on a private network. I'm using software called Pure Data, with a UDP broadcast tool called netsend~ and netreceive~. The code is here: http://www.remu.fr/sound-delta/netsend~/ To cut a long story short, I'm able ...
Hey everyone, I'm having a bit of a problem with UDP and Datagrams. I'm supposed to make a server that will get a request from the client to send a file in the same directory. The UDP Server will then get this file (a video), put it into a datagram and send it. I think I know how to do it, but I can't put the file in the datagram. I'm...
I'm new to network programming, and am basically learning-by-doing. I'm folling Mike Ashes program "Sphere Net" from iPhone Cool Projects. I understand what's going on in the program, but I'm ready to start extending it and I expect to be sending a reasonable variety of packet types (each represented as a struct). It doesn't seem rign...
For the following I'm assuming one network card. I have a component of my program which is designed to let others in the subnet know of its existence. For this, I've implemented a solution where whenever the program starts up (and periodically afterwards) it sends a broadcast to INADDR_BROADCAST - whoever listens on the required port w...
In other words, can I intercept those packets (possibly at the stack level) using a separate application, manipulate them and then send them to the destination the original application was trying to send them to? ...
I have an FPGA device with which my code needs to talk. The protocol is as follows: I send a single non-zero byte (UDP) to turn on a feature. The FPGA board then begins spewing data on the port from which I sent. Do you see my dilemma? I know which port I sent the message to, but I do not know from which port I sent (is this port no...
Which of the following ports is the best one to use for a program I'm working on using a custom protocol still under development. I'm looking for one that will be accessible to virtually every host that is connected to the public internet (ie every host that can view websites can use this port). The three main options are: port 53 udp ...
I have an application that is sending some UDP packets using multicast. I looked at the network traffic and there seems to be a lot of ancillary packets related to using multicast. I don't totally understand it, but does multicast by nature result in MORE network traffic. If so how can I throttle this down? x ...
Apologies if this is a dumb question, I've limited network knowledge. If I sent a string to port 80 on UDP, would the server / receiving IP log it? I'm pretty sure it wouldn't in access logs, but what about firewall logs? ...
I'm using sendto() and recvfrom() to send some simple packets via UDP over WiFI. I've tried using two phones, and a simulator, the results I'm getting are: Packets sent from phones -> recieved by simulator Packets sent from simulator -> simulator recvfrom remains blocking. Packets sent from phones -> other phone recvfrom remains blocki...
I was under the impression that in Java, a Thread will pause and give other threads a chance to do some work during blocking I/O operations ( like Socket.read() or DataGramsocket.receive() ). For some reason in my multi threaded network application, a call to receive() is causing all my other threads to starve ( the thread that called re...
I am trying to send over UDP using the following code, but i'm getting strange results. if((sendto(newSocket, sendBuf, totalLength, 0, (SOCKADDR *)&sendAddr, sizeof(sendAddr)) == bytesSent) < 0) { printf("Send error! - %d\n", WSAGetLastError()); } However say when the totalLength variable is set to 30 the sendto functio...