CODEWITHSUNDEEP
clinuxsocketstcp
fpemud
fpemud

Reputation: 363

"tcp session control protocol" in linux kernel?

I'm programming in Linux environment.

I want to establish a TCP socket between two PCs, and multiplexing it.

To be specific, here is the pseudo-code:

void func_in_process0()
{
    socket s = socket(AF_INET, SOCK_STREAM, 0);
    connect(s, "1.1.1.1", 8080);

    socket s1 = ADD_CHANNEL(s, 1);                    // key part
    SEND_FILE_DESCRIPTOR_TO_PROCESS(s1, process1);
    socket s2 = ADD_CHANNEL(s, 2);                    // key part
    SEND_FILE_DESCRIPTOR_TO_PROCESS(s2, process2);

    WAIT_FOR_PROCESS_TO_FINISH(process1);
    WAIT_FOR_PROCESS_TO_FINISH(process2);

    close(s);
}

void func_in_process1()
{
    socket s1 = GET_SOCKET_FROM_PROCESS0();

    send(s1, "abcdefg");
    close(s1);
}

void func_in_process2()
{
    socket s2 = GET_SOCKET_FROM_PROCESS0();

    send(s2, "abcdefg");
    close(s2);
}

The key part is how to implement function ADD_CHANNEL.

I found a document TCP Session Control Protocol which provides exactly the function I want. But I don't think it is implemented in Linux kernel.

I can implement this protocol in userspace, but variable "s1" and "s2" will not be file descriptor and can't be sent to other processses.

Edit:

  1. process0, process1 and process2 are all on localhost.

  2. socket "s" is a client socket.

  3. 1.1.1.1 is a remote PC, who is the server. so proc1 and proc2 both sends packet to 1.1.1.1 through the CHANNEL.

  4. the server is CHANNEL aware too.

Edit2:

  1. I read the SCP Protocol, but it still has no in-kernel implementation.

  2. I learned the SCTP multi-streaming, which is implemented in kernel, but there's no API that creates sub-socket so the problem remains.

Upvotes: 0

Views: 406

Answers (1)

David Schwartz
David Schwartz

Reputation: 182827

Sure, they can be file descriptors. Create two pipes and give one end to each of the other two processes. Your 'multiplexor' will read from, and write two, the other ends of the two bidirectional pipes.

Upvotes: 1

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