I know there are many threads about this theme, but i can not make it. I want to send a letter or a number over the Internet(not Local!). I have tried it with Ipv6 and Ip4 but both did not work. If you can pls in C# or Java :c Here are some code samples:
//Server
Socket sock = new Socket(AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp);
sock.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, 0);
sock.Bind(new IPEndPoint(IPAddress.IPv6Any, 5005));
sock.Listen(4);
Socket client = sock.Accept();
Console.WriteLine("Works!");
Console.ReadKey();
//Client
string ip;
ip = Console.ReadLine();
IPAddress ipad = IPAddress.Parse(ip);
Socket sock = new Socket(AddressFamily.InterNetworkV6,
SocketType.Stream,
ProtocolType.Tcp);
Console.WriteLine("try to "+ipad,
ipad);
sock.Connect(ipad, 5005);
Console.WriteLine("yesssssss");
Console.ReadKey();
Related
I have below code to print a simple txt file on a epson ip ticket printer. How can I add a paper cut line / paper cut?
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
clientSocket.NoDelay = true;
IPAddress ip = IPAddress.Parse("000.000.000.000");
IPEndPoint ipep = new IPEndPoint(ip, 9100);
clientSocket.Connect(ipep);
byte[] fileBytes = File.ReadAllBytes("C:/xxx/xxx.txt");
clientSocket.Send(fileBytes);
clientSocket.Close();
I am trying to write code the receives broadcast messages coming from another app. using wireShark, I can see that they are sent to 255.255.255.255:300.
I tried the following code:
IPEndPoint ServerEndPoint = new IPEndPoint(IPAddress.Any, 3000);
Socket WinSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
WinSocket.Bind(ServerEndPoint);
byte[] data = new byte[10];
Console.Write("Waiting for client");
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint Remote = (EndPoint)(sender);
int recv = WinSocket.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}:", Remote.ToString());
string str = Encoding.ASCII.GetString(data, 0, recv);
but when my app reached to the "bind" command there is an error message:
"Only one usage of each socket address (protocol/network address/port) is normally permitted"
if I change the port there is no error but I catch nothing.
Please advice
I am going to upgrade a system which used TCP connection without SSL. I want to add SSL encryption to the current connection without changing much in code. This is what there was previously in the code.
IPAddress ipAddress = IPAddress.Parse(IpAddress);
IPEndPoint remoteEP = new IPEndPoint(ipAddress, Port);
// Create a TCP/IP socket.
var client = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
client.BeginConnect(remoteEP,new AsyncCallback(ConnectCallback), client);
What I tried is this,
IPAddress ipAddress = IPAddress.Parse(IpAddress);
IPEndPoint remoteEP = new IPEndPoint(ipAddress, Port);
// Create a TCP/IP socket.
var client = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
client.BeginConnect(remoteEP, new AsyncCallback(ConnectCallback), client);
while (!client.Connected) { }
NetworkStream stream = new NetworkStream(client);
SslStream ssl = new SslStream(stream, false, ValidateServerCertificate);
But this is not doing what I need. At least ValidateServerCertificate delegate is not called.
What's wrong with my code?
IMPORTANT
I cannot remove this socket named client during the change because it will affect lot of other codes.
The following code sends a packet on port 15000:
int port = 15000;
UdpClient udp = new UdpClient();
//udp.EnableBroadcast = true; //This was suggested in a now deleted answer
IPEndPoint groupEP = new IPEndPoint(IPAddress.Broadcast, port);
string str4 = "I want to receive this!";
byte[] sendBytes4 = Encoding.ASCII.GetBytes(str4);
udp.Send(sendBytes4, sendBytes4.Length, groupEP);
udp.Close();
However, it's kind of useless if I can't then receive it on another computer. All I need is to send a command to another computer on the LAN, and for it to receive it and do something.
Without using a Pcap library, is there any way I can accomplish this? The computer my program is communicating with is Windows XP 32-bit, and the sending computer is Windows 7 64-bit, if it makes a difference. I've looked into various net send commands, but I can't figure them out.
I also have access to the computer (the XP one)'s local IP, by being able to physically type 'ipconfig' on it.
EDIT: Here's the Receive function I'm using, copied from somewhere:
public void ReceiveBroadcast(int port)
{
Debug.WriteLine("Trying to receive...");
UdpClient client = null;
try
{
client = new UdpClient(port);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
IPEndPoint server = new IPEndPoint(IPAddress.Broadcast, port);
byte[] packet = client.Receive(ref server);
Debug.WriteLine(Encoding.ASCII.GetString(packet));
}
I'm calling ReceiveBroadcast(15000) but there's no output at all.
Here is the simple version of Server and Client to send/receive UDP packets
Server
IPEndPoint ServerEndPoint= new IPEndPoint(IPAddress.Any,9050);
Socket WinSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
WinSocket.Bind(ServerEndPoint);
Console.Write("Waiting for client");
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0)
EndPoint Remote = (EndPoint)(sender);
int recv = WinSocket.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}:", Remote.ToString());
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
Client
IPEndPoint RemoteEndPoint= new IPEndPoint(
IPAddress.Parse("ServerHostName"), 9050);
Socket server = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp);
string welcome = "Hello, are you there?";
data = Encoding.ASCII.GetBytes(welcome);
server.SendTo(data, data.Length, SocketFlags.None, RemoteEndPoint);
Here is my code
Socket sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck.Bind(new IPEndPoint(IPAddress.Any, 0));
// Broadcast to find server
string msg = "Imlookingforaserver:" + udp_listen_port;
byte[] sendBytes4 = Encoding.ASCII.GetBytes(msg);
IPEndPoint groupEP = new IPEndPoint(IPAddress.Parse("255.255.255.255"), server_port);
sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
sck.SendTo(sendBytes4, groupEP);
//Wait response from server
Socket sck2 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck2.Bind(new IPEndPoint(IPAddress.Any, udp_listen_port));
byte[] buffer = new byte[128];
EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, udp_listen_port);
sck2.ReceiveFrom(buffer, ref remoteEndPoint); //<<< I never pass this line
I use above code to try find a server. First I broadcast a message and then I wait for a response from the server.
A test I made with the server written in C++ and running in Windows Vista, client written in C# and run on the same machine with server.
Problem is: The server can receive message which client broadcast, but client can not receive anything from server.
I try to write a client with C++ and it work like a charm, I think my problem is in C# client.
I would start listening on that port before you broadcast. You're using UDP which is connectionless so you could be missing your packet.
Socket sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck.Bind(new IPEndPoint(IPAddress.Any, 0));
//Wait response from server
Socket sck2 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck2.Bind(new IPEndPoint(IPAddress.Any, udp_listen_port));
byte[] buffer = new byte[128];
EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, udp_listen_port);
// Broadcast to find server
string msg = "Imlookingforaserver:" + udp_listen_port;
byte[] sendBytes4 = Encoding.ASCII.GetBytes(msg);
IPEndPoint groupEP = new IPEndPoint(IPAddress.Parse("255.255.255.255"), server_port);
sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
sck.SendTo(sendBytes4, groupEP);
sck2.ReceiveFrom(buffer, ref remoteEndPoint);