#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h> /* close() */
#include <string.h> /* memset() */

#define LOCAL_SERVER_PORT 100
#define MAX_MSG 500

int main(int argc, char *argv[])
{

   int sd, rc, n, cliLen;
   struct sockaddr_in cliAddr, servAddr;
   char msg[MAX_MSG];

   /* socket creation */
   sd=socket(AF_INET, SOCK_DGRAM, 0);
   if(sd<0) {
      printf("%s: cannot open socket \n",argv[0]);
      exit(1);
   }

   /* bind local server port */
   servAddr.sin_family = AF_INET;
   servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
   servAddr.sin_port = htons(LOCAL_SERVER_PORT);
   rc = bind (sd, (struct sockaddr *) &servAddr,sizeof(servAddr));
   if(rc<0) {
      printf("%s: cannot bind port number %d \n",
       argv[0], LOCAL_SERVER_PORT);
      exit(1);
   }

   printf("%s: waiting for data on port UDP %u\n",
       argv[0],LOCAL_SERVER_PORT);

   /* server infinite loop */
   while(1)
   {

      /* init buffer */
      memset(msg,0x0,MAX_MSG);


      /* receive message */
     cliLen = sizeof(cliAddr);
     n = recvfrom(sd, msg, MAX_MSG, 0,(struct sockaddr *) &cliAddr, &cliLen);
 printf("Fail\n");
      if(n<0)
      {
         printf("%s: cannot receive data \n",argv[0]);
         continue;
      }

      /* print received message */
      printf("%s: from %s:UDP%u : %s \n",
       argv[0],inet_ntoa(cliAddr.sin_addr),
       ntohs(cliAddr.sin_port),msg);

   }/* end of server infinite loop */

return 0;

}