#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <unistd.h>

/* argv[1] = le numéro de port sur lequel tourne le service (par ex:80 pour http) */
/* AF_INET= ipv4, SOCK_STREAM corresponds à TCP*/
#define BUFF_SIZE 1024

int main(int argc, char *argv[])
{
    int s;
    struct sockaddr_in addr_internet;
    struct sockaddr_in addr_client;
    
    if(argc<2) {
        printf("Usage : %s <port>\n", argv[0]);
        exit(1);
    }


    if((s=socket(AF_INET, SOCK_STREAM,0))<0) {
        perror("socket");
        exit(1);
    }

    addr_internet.sin_family=AF_INET;
    addr_internet.sin_port = (in_port_t)htons(atoi(argv[1]));
    addr_internet.sin_addr.s_addr = htonl(INADDR_ANY);

    if((bind(s, (struct sockaddr *)&addr_internet, sizeof(addr_internet)))<0)
        perror("bind");

    if(listen(s, 10)<0)
        perror("listen");

    socklen_t len_client;
    int new_socket;
    if((new_socket=accept(s, (struct sockaddr *)&addr_client, &len_client))<0)
        perror("accept");

    printf("New client\n");

    /* initialisation terminée */

    char buff_e[BUFF_SIZE];
    ssize_t nread;
    nread=read(0,buff_e,BUFF_SIZE);
    write(new_socket,buff_e,nread);

    char buff_r[BUFF_SIZE];
    while(1) { 
        nread=read(new_socket,buff_r,BUFF_SIZE);
        if(nread == 0)
            break;
        write(1,buff_r,nread);
    }

    close(s);
    return 0;
}