Exp 6

client.c

/*********************************************                                                                                                              * Author: Rohan Garg <[email protected]> *                                                                                                              * License: MIT ( 2011 )                      *                                                                                                              * client.c [ Experiment 6 ]                  *
*********************************************/

#include<stdio.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<sys/errno.h>
#include<string.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<string.h>
#include<netdb.h>
# define MYPORT  21750
int main()
{
  
  int socketid, k,len;
  char buf[100];
  char ch[100];
  struct sockaddr_in server, client;
  socketid=socket(AF_INET,SOCK_STREAM,0);
  
  
  
  server.sin_family=AF_INET;
  server.sin_port=htons(MYPORT);
  server.sin_addr.s_addr=inet_addr("192.168.56.150");
  
  len=sizeof(server);
  k=connect(socketid,(struct sockaddr*) &server,len);
  

  while(1){
      printf("Enter site name :\n ");
      len = read(0 , ch , 100);
      ch[len-1] = '\0';
      write(k, ch, len);
      len = read(socketid,buf, 100);
      buf[len-1]='\0';
      if(len>0){
	printf(" %s\n",inet_ntoa(*((struct in_addr*) buf)));
      }
    }
  close(socketid);
  return 1;
}

/*********************************************
*                 OUTPUT                     *
* student@ubuntu:~/08EL285$ ./client         *
*  Enter site name :                         *
*   www.google.com                           *
*     88.243.100.237                         *
*  Enter site name :                         *
*   www.gmail.com                            *
*     88.243.100.237                         *
*********************************************/     

server.c

/*********************************************                                                              * Author: Rohan Garg <[email protected]> *
* License: MIT ( 2011 )
* server.c [ Experiment 6 ]                  *
*********************************************/

#include<stdio.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#include<sys/errno.h>
#include<netdb.h>
#define MYPORT 21750
int main()
{

  struct hostent *host;
  int sockid, len;
  int retbind, retaccept;
  char ch[100];
  struct sockaddr_in server, client;
  sockid=socket(AF_INET,SOCK_STREAM,0);
  int k;

  server.sin_family=AF_INET;
  server.sin_port=htons(MYPORT);
  server.sin_addr.s_addr=inet_addr("192.168.56.150");
  retbind = bind(sockid,(struct sockaddr*) &server,sizeof(server));
  
  listen(sockid,10);
  len=sizeof(client);
  
  retaccept = accept(sockid , (struct sockaddr*) &client, &len);

  while(1){
      len = read(retaccept , ch , 100);
      ch[len] = '\0';
      host = gethostbyname(ch);
      if(host == NULL)
	write(retaccept , " Invalid site name \n" , 20 );
      else
	write(retaccept ,host->h_addr , 40 );
    }
  close(sockid);
  return 1;
}