hashim

#include<stdio.h>
#include<string.h>
#include<time.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<unistd.h>
#define packetcount 10 
typedef struct Packet
{
int id;
int recieved;
}Packet;
Packet packets[packetcount];
void main()
{
for(int i=0;i<packetcount;++i)
{
packets[i].id=i+1;
packets[i].recieved=0;
}
char *ip="127.0.0.100";
int port=5555;
srand(time(0));
int sockfd;
struct sockaddr_in server_addr,client_addr;
char buffer[1024];
socklen_t addr_size;
int n;
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0)
{
perror("[-] Socket error");
exit(1);
}
memset(&server_addr,'\0',sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(port);
server_addr.sin_addr.s_addr=inet_addr(ip); 
n=bind(sockfd,(struct sockaddr*)&server_addr,sizeof(server_addr));
if(n<0)
{
perror("[-] bind error");
exit(1);
}
while(1)
{
bzero(buffer,1024);
addr_size=sizeof(client_addr);
recvfrom(sockfd,buffer,1024,0,(struct sockaddr*)&client_addr,&addr_size);
sleep(1);
int paclet=atoi(buffer);
if(packets[packet-1].recieved==1||rand()%5==0)
continue;
else if(rand()%4==0)
{
printf("server:recieved corrupted packeted %s.sending negatrive ackn\n",buffer);
sprintf(buffer,"NACK %d",packet);
sendto(sockfd,buffer,1024,0,(struct sockaddr*)&client_addr,sizeof(client_addr));
}
else
{
printf("server:recieved  packet .sending  ackn\n",buffer);
sprintf(buffer,"ACK %d",packet);
sendto(sockfd,buffer,1024,0,(struct sockaddr*)&client_addr,sizeof(client_addr));
packets[packet-1].recieved=1;
}
}
}