server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>


int main() {
    int def_sock, new_sock;
    struct sockaddr_in s_addr;
    struct sockaddr_in n_addr;
    socklen_t addr_size;
    char buffer[1024];

    /*---- Create the socket. The three arguments are: ----*/
    /* 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) */
    def_sock = socket(AF_INET, SOCK_STREAM, 0);

    if  (def_sock == -1) {
        printf("Socket can't be created, exit script");
        exit(1);
    }


    /*---- Configure settings of the server address struct ----*/
    s_addr.sin_family = AF_INET;
    s_addr.sin_port = htons(5001);
    s_addr.sin_addr.s_addr = INADDR_ANY;

    memset(s_addr.sin_zero, '\0', sizeof s_addr.sin_zero);
    printf("Port = '%d'\n", s_addr.sin_port);

    /*---- Bind the address struct to the socket ----*/
    bind(def_sock, (struct sockaddr *) &s_addr, sizeof(s_addr));



    /*---- Listen on the socket, with 5 max connection requests queued ----*/
    if(listen(def_sock,5)==0)
        printf("Listening\n");
    else
        printf("Listening can't be started\n");


    /*---- Accept call creates a new socket for the incoming connection ----*/
    do {
        addr_size = sizeof n_addr;
        new_sock = accept(def_sock, (struct sockaddr *) &n_addr, &addr_size);

        if ( new_sock == -1 ) {
            printf("Can't create socket for connection\n");
            exit(1);
        }

        /*---- Send message to the socket of the incoming connection ----*/
        memset(buffer, 0, sizeof buffer);
        strcpy(buffer,"Hello World!\n");
        send(new_sock,buffer,13,0);

        /*---- Read the message from the client into the buffer ----*/
        //memset(buffer, 0, sizeof buffer);
        if (recv(new_sock, buffer, sizeof(buffer), 0) < 0) {
            printf("Can't get message from client\n");
        }
        else {
            printf("Client said %s\n", buffer);
        }


    } while(1);


    return 0;
}