crack.h

/*
 * Copyright (C) 2018 David C. Harrison. All right reserved.
 *
 * You may not use, distribute, publish, or modify this code without 
 * the express written permission of the copyright holder.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h> 
#include <netdb.h>
#include <sys/types.h> 
#include <sys/socket.h>
#include <netinet/in.h> 
#include <thread>
#include <string>
#include <vector>
#include <deque>
#include <iostream>
#include <ctime>

#define HASH_LENGTH       13
#define MAX_HASHES        64
#define MAX_HOSTNAME_LEN  64
#define MAX_CRUZID_LEN    32

/*
 * On-wire datagram. 
 *
 * Numeric elements should be converted to network byte-order before transmission
 * and converted back to host byte-order on receipt.
 */
typedef struct message_t {
    char cruzid[MAX_CRUZID_LEN];             // Who this datagram is for
    char passwds[MAX_HASHES][HASH_LENGTH+1]; // NUM_PASSWD plain text passwords or password hashes
    unsigned int num_passwds;                // Number of plain text passwords or password  hases in PASSWDS
    char hostname[MAX_HOSTNAME_LEN];         // Host to return decrypted passwords to over TCP
    unsigned int port;                       // Port to return decrypted passwords to
}
Message;

/*
 * Find the four character plain-text password PASSWD given the 
 * password hash HASH.
 *
 * Each byte in passwd is restricted to [a..z][A..Z][0..9]
 * 
 * For example: "Y6f0" is valid, but "a$^K" is not.
 */
void crack(const char *hash, char *passwd);

/*
 * Returns the multicast address the currently logged in user should use
 */
in_addr_t get_multicast_address();

/*
 * Returns the multicast port the currently logged in user should use
 */
unsigned int get_multicast_port();

/*
 * Returns the unicast port the currently logged in user should use
 */
unsigned int get_unicast_port();


class Crackserver{
public:
	void server();
	Message sendUDPmsg();
	void recvTCPmsg(Message &msg);
};

class Crackclient{
public:
	void client();
	Message recvUDPmsg();
	void setRange(Message &msg, char* hostname, int* range);
	void crackpasswds(Message &msg);
	void sendTCPmsg(Message &msg);
};