I am trying to read ASCII text response from a tcp open streaming socket This is what I have come up with so far. I want to know what is the best way to do this that includes error handling. Should I also be checking the SocketError after the Receive call in the do loop? IPEndPoint ep = new IPEndPoint(IPAddress.Parse("192.168.1.1"), ...
Greetings, I'm trying to find a way to 'unbind' a socket from a particular IP/Port combination. My pseudocode looks like this: ClassA a = new ClassA(); //(class A instantiates socket and binds it to 127.0.0.1:4567) //do something //...much later, a has been garbage-collected away. ClassA aa = new ClassA(); //crash here. At this p...
I have a machine with VmWare installed which added two extra network interfaces. The OS is Vista. I have two Java applications, one which broadcasts datagrams, and one which receives those datagrams. The problem I'm having is that unless I disable both VmWare network interfaces, the receiver can't receive the datagrams. What is th...
I am a bit confused about socket programming in C. You create a socket, bind it to an interface and an IP address and get it to listen. I found a couple of web resources on that, and understood it fine. In particular, I found an article Network programming under Unix systems to be very informative. What confuses me is the timing of dat...
When I call socket.getsockname() on a socket object, it returns a tuple of my machine's internal IP and the port. However, I would like to retrieve my external IP. What's the cheapest, most efficient manner of doing this? ...
I'm reading lines of input on a TCP socket, similar to this: class Bla def getcmd @sock.gets unless @sock.closed? end def start srv = TCPServer.new(5000) @sock = srv.accept while ! @sock.closed? ans = getcmd end end end If the endpoint terminates the connection while getline() is running then ...
I am getting the following error trying to read from a socket. I'm doing a readInt() on that InputStream, and I am getting this error. Perusing the documentation this suggests that the client part of the connection closed the connection. In this scenario, I am the server. I have access to the client log files and it is not closing the c...
Sorry for the subject line sounding like an even nerdier Harry Potter title. I'm trying to use AS3's Socket class to write a simple FTP program to export as an AIR app in Flex Builder 3. I'm using an FTP server on my local network to test the program. I can successfully connect to the server (the easy part) but I can't send any comman...
I have seen another program provide traceroute functionality within it but without needing root (superuser) privileges? I've always assumed that raw sockets need to be root, but is there some other way? (I think somebody mentioned "supertrace" or "tracepath"?) Thanks! ...
I'm a beginning C++ programmer / network admin, but I figure I can learn how to do this if someone points me in the right direction. Most of the tutorials are demonstrated using old code that no longer works for some reason. Since I'm on Linux, all I need is an explanation on how to write raw Berkeley sockets. Can someone give me a qui...
Hi there, i'm begining on a new proyect that need to collect data from some VoIP network equiment, and i thinking to make a python app using some network library and need know some intersting Books or web resources about the netwoking library in python. best regards. ...
How do i measure how long a client has to wait for a request. On the server side it is easy, through a filter for example. But if we want to take into accout the total time including latency and data transfer, it gets diffcult. is it possible to access the underlying socket to see when the request is finished? or is it neccessary to d...
I have some experience making multiplayer turn-based games using sockets, but I've never attempted a realtime action game. What kind of extra issues would I have to deal with? Do I need to keep a history of player actions in case lagged players do something in the past? Do I really need to use UDP packets or will TCP suffice? What else? ...
I am trying to write a C# client to a server that is written in Java. The server expects a 4 byte (DataInputStread readInt() in Java) message header followed by the actual message. I am absolutely new to C#, how can I send this message header over to the Java Server? I tried it several ways (mostly trial and error without getting too de...
I came back today to an old script I had for logging into Gmail via SSL. The script worked fine last time I ran it (several months ago) but now it dies immediately with: <urlopen error The read operation timed out> If I set the timeout (no matter how long), it dies even more immediately with: <urlopen error The connect operation time...
I want to read the contents of a URL but don't want to "hang" if the URL is unresponsive. I've created a BufferedReader using the URL... URL theURL = new URL(url); URLConnection urlConn = theURL.openConnection(); urlConn.setDoOutput(true); BufferedReader urlReader = new BufferedReader(newInputStreamReader(urlConn.getInputStream())); ...
I'm implementing a simple service using datagrams over unix local sockets (AF_UNIX address family, i.e. not UDP). The server is bound to a public address, and it receives requests just fine. Unfortunately, when it comes to answering back, sendto fails unless the client is bound too. (the common error is Transport endpoint is not conne...
I got a call from a tester about a machine that was failing our software. When I examined the problem machine, I quickly realized the problem was fairly low level: Inbound network traffic works fine. Basic outbound command like ping and ssh are working fine, but anything involving the connect() call is failing with "No route to host". F...
From what I understand, the crystals on PC's are notorious for clock skew. If clocks are always skewing, what is the best way to synchronize clocks between machines with millisecond accuracy and precision? From what I've found, NTP and PTP are possible solutions, but I was wondering if anybody had any experience on stackoverflow.com! I ...
I have a java app (not running in any application container) which listens on a ServerSocket for connections. I would like it to only accept connections which come from localhost. Currently, after a connection is accepted, it checks the peer IP and rejects it if it is not the loopback address, but I know that peer IP addresses can be s...