// Client side implementation of UDP client-server model 
#include <stdio.h> 
#include <stdlib.h> 
#include <unistd.h> 
#include <string.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <netinet/in.h> 
  
#define PORT    26000 
#define MAXLINE 1024 

char *UDP_AddrToString (struct sockaddr_in *addr)
{
    static char buffer[22];
    int haddr;

    haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);

    sprintf(buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff,
    (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff, ntohs(((struct sockaddr_in *)addr)->sin_port));

    return buffer;
}
  
// Driver code 
int main() { 
    int sockfd; 
    char buffer[MAXLINE]; 
    char *hello = "Hello from client"; 
    struct sockaddr_in servaddr; 
  
    // Creating socket file descriptor 
    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) { 
        perror("socket creation failed"); 
        exit(EXIT_FAILURE); 
    } 
  
    memset(&servaddr, 0, sizeof(servaddr)); 
      
    // Filling server information 
    servaddr.sin_family      = AF_INET; 
    servaddr.sin_port        = htons(PORT); 
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
      
    int n, len; 
    
    sendto (sockfd, (const char *)hello, strlen(hello), MSG_CONFIRM, (const struct sockaddr *)&servaddr, sizeof(servaddr));
    
    printf("Hello message sent.\n"); 
          
    n         = recvfrom(sockfd, (char *)buffer, MAXLINE, MSG_WAITALL, (struct sockaddr *)&servaddr, &len); 
    buffer[n] = '\0';
    
    printf("From: %s\n", UDP_AddrToString(&servaddr));
    printf("Server: %s\n", buffer); 
  
    close(sockfd); 
    return 0; 
}