S01_BSD_01_SERVER

/*
Napisz programy do przesyłania prostych komunikatów między dwoma komputerami zuż yciem protokoł u TCP/IP.
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>

#define PORT 1919
#define MAX_CLIENTS 5
#define READ_BUFFER_SIZE 128

void error_handler(const char *msg)
{
    perror(msg);
    exit(EXIT_FAILURE);
}

int main(void)
{
    struct sockaddr_in server_addr, client_addr;
    int server_socket, client_socket;
    char buffer[READ_BUFFER_SIZE];

    if((server_socket = socket(AF_INET, SOCK_STREAM, 0)) == -1)
        error_handler("socket");

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    memset(server_addr.sin_zero, '\0', 8);

    if(bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1)
        error_handler("bind");

    if(listen(server_socket, MAX_CLIENTS) == -1)
        error_handler("listen");

    printf("Oczekiwanie na polaczenie...\n");

    socklen_t struct_size = sizeof(struct sockaddr);
    if((client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &struct_size)) == -1)
        error_handler("accept");

    printf("Polaczono, oczekiwanie na przeslanie wiadomosci...\n");

    memset(buffer, '\0', READ_BUFFER_SIZE);
    if(read(client_socket, buffer, READ_BUFFER_SIZE-1) == -1)
        error_handler("read");

    printf("Przeslana wiadomosc: %s\n", buffer);

    if(close(server_socket) == -1)
        error_handler("close");

    return EXIT_SUCCESS;
}