Buffer Overflow Tutorial - Socket Program

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
/*
http://www.terminalcoders.blogspot.com
BOF Tutorial
Video: https://youtu.be/uPfBkU0LqBA
*/
void copy(char str[8000]){ //Vulnerable function
  char cpy[84];
  strcpy(cpy, str); //Vulnerable section
}
void start_server(){
    char str[8000], cpy[64];
    int sfd, cfd;

    struct sockaddr_in sock;

    sfd = socket(AF_INET, SOCK_STREAM, 0);

    bzero(&sock, sizeof(sock));

    sock.sin_family = AF_INET;
    sock.sin_addr.s_addr = htons(INADDR_ANY);
    sock.sin_port = htons(5601); //Binding port

    bind(sfd, (struct sockaddr *) &sock, sizeof(sock));

    listen(sfd, 10);

    cfd = accept(sfd, (struct sockaddr*) NULL, NULL);

    while(1){
        read(cfd,str,8000);
        copy(str);
        puts(str);
        write(cfd, str, strlen(str)+1);
    }
}
int main(int argc, char **argv){
    start_server();
}