Bsd socket how can I find server port number for connection?

Question

I have a server:

./server portNumber

I have a client:

./client serverIpAddress

I have only server Ip Address in the client. I want to connect to Server socket. But every time Server Port Number is different. How Can I connect to server socket with BSD Socket in the client? Is it impossible? Do I have to know server port number?

Simple Usage BSD Socket:

    int socket_desc;
    struct sockaddr_in server;

    //Create socket
    socket_desc = socket(AF_INET , SOCK_STREAM , 0);
    if (socket_desc == -1)
    {
        printf("Could not create socket");
    }

    server.sin_addr.s_addr = inet_addr(ipAddress);
    server.sin_family = AF_INET;
    server.sin_port = htons( ThisIsServerPortNumber );

    //Connect to remote server
    if (connect(socket_desc , (struct sockaddr *)&server , sizeof(server)) < 0)
    {
        puts("connect error");
        return 1;
    }

Where's your C code where you set up the socket? Your question is a bit unclear. Or do you want to find it from the command line? — Will

user3386109 user3386109 · Accepted Answer · 2016-05-22T03:10:26

Pick a port number between 49152 and 65535 for development. If your idea is successful, you'll want to register a port number between 1024 and 49151. Port numbers from 0 to 1023 are well-known ports, e.g. port 80 is for HTTP servers.

The TCP Port Service Multiplexer protocol was intended to allow discovery of port numbers for TCP servers, but it's seldom used due to security concerns.

Bsd socket how can I find server port number for connection?

3 Answers