Write a program using socket programming for UDP preferably in C.

//UDP client:-

#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>

#include <string.h> /* memset() */

#include <sys/time.h> /* select() */

#include <stdlib.h>

#define REMOTE_SERVER_PORT 2500

#define MAX_MSG 100

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

int sd, rc, i,cliLen,n;

struct sockaddr_in cliAddr, remoteServAddr;

struct hostent *h;

char msg[100];

   /* check command line args */

   if(argc<2)

   {

      printf("usage : %s <server>  \n", argv[0]);

      exit(1);

   }

   /* get server IP address (no check if input is IP address or DNS name */

   h = gethostbyname(argv[1]);

   if(h==NULL)

   {

      printf("%s: unknown host '%s' \n", argv[0], argv[1]);

      exit(1);

   }

   printf("%s: sending data to '%s' (IP : %s) \n", argv[0], h->h_name,

   inet_ntoa(*(struct in_addr *)h->h_addr_list[0]));

   remoteServAddr.sin_family = h->h_addrtype;

   memcpy((char *) &remoteServAddr.sin_addr.s_addr,h->h_addr_list[0], h->h_length);

   remoteServAddr.sin_port = htons(REMOTE_SERVER_PORT);

   /* socket creation */

   sd = socket(AF_INET,SOCK_DGRAM,0);

   if(sd<0)

   {

      printf("%s: cannot open socket \n",argv[0]);

      exit(1);

   }

  

   /* bind any port */

   cliAddr.sin_family = AF_INET;

   cliAddr.sin_addr.s_addr = htonl(INADDR_ANY);

   cliAddr.sin_port = htons(0);

  

   rc = bind(sd, (struct sockaddr *) &cliAddr, sizeof(cliAddr));

   if(rc<0)

   {

      printf("%s: cannot bind port\n", argv[0]);

      exit(1);

   }

   /* send data */

   while(1)

   {

      char temp[100];

      //printf("client :");

                scanf("%s",temp);

      rc = sendto(sd, temp, strlen(temp), 0,(struct sockaddr *) &remoteServAddr,sizeof(remoteServAddr));

      if(rc<0)

                {

         printf("%s: cannot send data %d \n",argv[0],i-1);

         close(sd);

         exit(1);

      }

                cliLen = sizeof(remoteServAddr);

      n = recvfrom(sd, msg, MAX_MSG, 0,(struct sockaddr *) &remoteServAddr, &cliLen);

                printf("Server:%s\n",msg);

   }

   return 1;

}

//UDP server:-

#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() */

#include <stdlib.h>

#define LOCAL_SERVER_PORT 2500

#define MAX_MSG 100

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);

  if(n<0)

  {

         printf("%s: cannot receive data \n",argv[0]);

         continue;

  }

        

  /* print received message */

  printf("Client: %s \n",msg);

  

  char temp[100];

  //printf("client :");

  scanf("%s",temp);

  rc = sendto(sd, temp, strlen(temp), 0,(struct sockaddr *) &cliAddr,sizeof(cliAddr));

  //printf("%s",temp);

}/* end of server infinite loop */

return 0;

}