SnW_receiver

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>

int main(void)
{
    int socket_desc, client_sock, client_size;
    struct sockaddr_in server_addr, client_addr;
    char buffer[1024];              //for snw
    int k=5,m=1,p;                    //for snw


    // Create socket:
    socket_desc = socket(AF_INET, SOCK_STREAM, 0);

    if(socket_desc < 0){
        printf("Error while creating socket\n");
        return -1;
    }
    printf("Socket created successfully\n");

    // Set port and IP:
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(2000);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // Bind to the set port and IP:
    if(bind(socket_desc, (struct sockaddr*)&server_addr, sizeof(server_addr))<0){
        printf("Couldn't bind to the port\n");
        return -1;
    }
    printf("Done with binding\n");

    // Listen for clients:
    if(listen(socket_desc, 1) < 0){
        printf("Error while listening\n");
        return -1;
    }
    printf("\nListening for incoming connections.....\n");

    // Accept an incoming connection:
    client_size = sizeof(client_addr);
    client_sock = accept(socket_desc, (struct sockaddr*)&client_addr, &client_size);

    if (client_sock < 0){
        printf("Can't accept\n");
        return -1;
    }
    printf("Client connected at IP: %s and port: %i\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

    while(k!=0)    //demo for 5 packets
    {
                   int y = recv(client_sock,buffer,1024,0);
                   if(y==-1)
                   {
                            printf("Error in receiving");
                            exit(1);
                   }
                   if(strncmp(buffer,"frame",5)==0)
                         printf("Received frame %d successfully\n",m);
                   else
                       printf("Frame %d not received\n",m);
                   if(m%2==0)
                             strcpy(buffer,"ack");
                   else
                   {
                             strcpy(buffer,"kca");
                             printf("Ack lost\n");
                             for(p=1;p<=3;p++)
                             {
                                printf("Waiting for %d seconds\n",p);
                             }
                             printf("Retransmitting ack...\n");
                             strcpy(buffer,"ack");
                             sleep(3);
                   }
                   printf("sending ack %d\n",m);
                   int z= send(client_sock, buffer,19,0);
                   if(z==-1)
                   {
                            printf("Error in sending");
                            exit(1);
                   }
                   k--;
                   m++;
    }
    // Closing the socket:
    close(client_sock);
    close(socket_desc);

    return 0;
}