:Implementation of following spoofing assignments using C++ multicore Programming a) IP Spoofing b) Web spoofing

(UDP Server)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>

int main()
{
        int sock;
        int addr_len, bytes_read;
        char recv_data[1024];
        struct sockaddr_in server_addr , client_addr;


        if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
            perror("Socket");
            exit(1);
        }

        server_addr.sin_family = AF_INET;
        server_addr.sin_port = htons(5000);
        server_addr.sin_addr.s_addr = INADDR_ANY;
        bzero(&(server_addr.sin_zero),8);


        if (bind(sock,(struct sockaddr *)&server_addr,
            sizeof(struct sockaddr)) == -1)
        {
            perror("Bind");
            exit(1);
        }

        addr_len = sizeof(struct sockaddr);

printf("\nUDPServer Waiting for client on port 5000");
printf("\n UDPServer Address : - %u\n", server_addr.sin_addr.s_addr);
        fflush(stdout);

while (1)
{

          bytes_read = recvfrom(sock,recv_data,1024,0,
                   (struct sockaddr *)&client_addr, &addr_len);
 

 recv_data[bytes_read] = '\0';

          printf("\n(%s , %d) said : ",inet_ntoa(client_addr.sin_addr),
                                       ntohs(client_addr.sin_port));
          printf("%s", recv_data);
 fflush(stdout);

        }
        return 0;
}
......................................................................................................................................................................
(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 <errno.h>
#include <string.h>
#include <stdlib.h>

int main()
{
int sock;
struct sockaddr_in server_addr;
struct hostent *host;
char send_data[1024];

host= (struct hostent *) gethostbyname((char *)"127.0.0.1");


if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
perror("socket");
exit(1);
}

server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(5000);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(server_addr.sin_zero),8);

   while (1)
   {

    printf("Type Something (q or Q to quit):");
    gets(send_data);

    if ((strcmp(send_data , "q") == 0) || strcmp(send_data , "Q") == 0)
       break;

    else
       sendto(sock, send_data, strlen(send_data), 0,
              (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
     
   }

}
###################################################################################
Output

Terminal 1 (Server)
[soet@localhost gggggg]$ gcc udp.c -o udp
[soet@localhost gggggg]$ ./udp

UDPServer Waiting for client on port 5000
 UDPServer Address : - 0

(127.0.0.1 , 45996) said : hello
(127.0.0.1 , 45996) said : hi
(127.0.0.1 , 45996) said : how r u ?

Terminal 2 (Client)
[root@localhost gggggg]# ./udpClient 127.0.0.1 5000
Type Something (q or Q to quit):hello
Type Something (q or Q to quit):hi
Type Something (q or Q to quit):how r u ?  
Type Something (q or Q to quit):

Terminal 3:-
[soet@localhost ~]$ cd gggggg
[soet@localhost gggggg]$ nc -u 127.0.0.1 5000 adsa
Ncat: Got more than one port specification: 5000 adsa. QUITTING.