16.bound_host1.c

//
// Created by satellite on 5/4/2023.
//

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "unistd.h"
#include "arpa/inet.h"
#include "sys/socket.h"

#define BUF_SIZE 30
void error_handling(char* message)
{
    fputs(message,stderr);
    fputc('\n',stderr);
    exit(1);
}

int main(int argc , char *argv[])
{
    int sock;
    char message[BUF_SIZE];
    struct sockaddr_in my_adr , your_adr;
    socklen_t adr_sz;
    int str_len , i;

    if (argc != 2) {
        printf("Usage : %s <port>\n", argv[0]);
        exit(1);
    }

    sock = socket(PF_INET,SOCK_DGRAM,0);
    memset(&my_adr,0,sizeof(my_adr));
    my_adr.sin_family = AF_INET;
    my_adr.sin_port = htons(atoi(argv[1]));
    my_adr.sin_addr.s_addr = htonl(INADDR_ANY);

    if(bind(sock,(struct sockaddr*)&my_adr,sizeof(my_adr)) == -1)
        error_handling("bind() error");

    for(int i=0;i<3;i++)
    {
        sleep(5);
        adr_sz = sizeof(your_adr);
        str_len = recvfrom(sock,message,BUF_SIZE,0,(struct sockaddr*)&your_adr,&adr_sz);
        printf("Message %d : %s \n",i+1,message);
    }
    close(sock);
    return 0;
}