S01_BSD_03_SERVER

/*
Napisz program, ktory bedzie realizowal polecenie zawarte w zadaniu pierwszy, ale w oparciu o protokol UDP/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 SERVER_PORT 1919

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

int main(void)
{
    int socketfd;
    struct sockaddr_in sockaddr;
    char buffer[BUFSIZ];

    sockaddr.sin_family = AF_INET;
    sockaddr.sin_port = htons(SERVER_PORT);
    sockaddr.sin_addr.s_addr = INADDR_ANY;
    memset(sockaddr.sin_zero, '\0', 8);

    if((socketfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
        error_handler("socket");

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

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

    socklen_t socklen = sizeof(struct sockaddr);
    if(recvfrom(socketfd, buffer, BUFSIZ, 0, (struct sockaddr *)&sockaddr, &socklen) == -1)
        error_handler("recvfrom");

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

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

    return EXIT_SUCCESS;
}