SnW_sender

#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;
    struct sockaddr_in server_addr;
    char buffer[1024];             //for snw
    int k=5,m=1,p;                   //for snw
    // Clean buffers:
    //memset(server_message,'\0',sizeof(server_message));
    //memset(client_message,'\0',sizeof(client_message));

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

    if(socket_desc < 0){
        printf("Unable to create socket\n");
        return -1;
    }

    printf("Socket created successfully\n");

    // Set port and IP the same as server-side:
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(2000);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // Send connection request to server:
    if(connect(socket_desc, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0){
        printf("Unable to connect\n");
        return -1;
    }
    printf("Connected with server successfully\n");

    while(k!=0)
    {
               if(m<=5)
                       printf("Sending frame %d\n",m);
               if(m%2==0)
                         strcpy(buffer,"frame");
               else
               {
                   strcpy(buffer,"error");
                   printf("Packet loss\n");
                   for(p=1;p<=3;p++)
                   {
                                printf("Waiting for %d seconds\n",p);
                   }
                   printf("retransmitting...\n");
                   strcpy(buffer,"frame");
                   sleep(3);
               }
               int y= send(socket_desc,buffer,19,0);
               if(y==-1)
               {
                        printf("Error in sending");
                        exit(1);
               }
               else
               {
                   printf("Sent frame %d\n",m);
               }
               int z=recv(socket_desc,buffer,1024,0);
               if(z==-1)
                        printf("Error in receiving data");
               if(strncmp(buffer,"ack",3)==0)
                         printf("Received ACK for frame %d \n",m);

               k--;
               m++;
    }
    // Close the socket:
    close(socket_desc);

    return 0;
}