/***************************************************************************
 * TargetGroup.h -- The "TargetGroup" class holds a group of IP addresses, *
 * such as those from a '/16' or '10.*.*.*' specification.  It also has a  *
 * trivial HostGroupState class which handles a bunch of expressions that  *
 * go into TargetGroup classes.                                            *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is    *
 * also a registered trademark of Insecure.Com LLC.  This program is free  *
 * software; you may redistribute and/or modify it under the terms of the  *
 * GNU General Public License as published by the Free Software            *
 * Foundation; Version 2 with the clarifications and exceptions described  *
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 * technology into proprietary software, we sell alternative licenses      *
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 *                                                                         *
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 *                                                                         *
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 *                                                                         *
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 *                                                                         *
 ***************************************************************************/

/* $Id$ */

#ifndef TARGETGROUP_H
#define TARGETGROUP_H

#include <limits.h>

#include <list>
#include <queue>
#include <set>
#include <string>

#include "nmap.h"

/* We use bit vectors to represent what values are allowed in an IPv4 octet.
   Each vector is built up of an array of bitvector_t (any convenient integer
   type). */
typedef unsigned long bitvector_t;
/* A 256-element bit vector, representing legal values for one octet. */
typedef bitvector_t octet_bitvector[(256 - 1) / (sizeof(unsigned long) * CHAR_BIT) + 1];

class NetBlock {
public:
  virtual ~NetBlock() {}
  std::string hostname;
  std::list<struct sockaddr_storage> resolvedaddrs;

  /* Parses an expression such as 192.168.0.0/16, 10.1.0-5.1-254, or
     fe80::202:e3ff:fe14:1102/112 and returns a newly allocated NetBlock. The af
     parameter is AF_INET or AF_INET6. Returns NULL in case of error. */
  static NetBlock *parse_expr(const char *target_expr, int af);

  bool is_resolved_address(const struct sockaddr_storage *ss) const;

  virtual bool next(struct sockaddr_storage *ss) = 0;
  virtual void apply_netmask(int bits) = 0;
  virtual std::string str() const = 0;
};

class NetBlockIPv4Ranges : public NetBlock {
public:
  octet_bitvector octets[4];

  bool next(struct sockaddr_storage *ss);
  void apply_netmask(int bits);
  std::string str() const;

private:
  unsigned int counter[4];
};

class NetBlockIPv6Netmask : public NetBlock {
public:
  void set_addr(const struct sockaddr_in6 *addr);

  bool next(struct sockaddr_storage *ss);
  void apply_netmask(int bits);
  std::string str() const;

private:
  bool exhausted;
  struct sockaddr_in6 addr;
  struct in6_addr start;
  struct in6_addr cur;
  struct in6_addr end;
};

class NetBlockHostname : public NetBlock {
public:
  NetBlockHostname(const char *hostname, int af);
  int af;
  int bits;

  NetBlock *resolve() const;

  bool next(struct sockaddr_storage *ss);
  void apply_netmask(int bits);
  std::string str() const;
};

/* Adding new targets is for NSE scripts */
class NewTargets {
public:
  NewTargets();

  /* return a previous inserted target */
  static std::string read (void);

  /* clear the scanned_targets_cache */
  static void clear (void);

  /* get the number of all new added targets */
  static unsigned long get_number (void);

  /* get the number that have been scanned */
  static unsigned long get_scanned (void);

  /* get the number of queued targets left to scan */
  static unsigned long get_queued (void);

  /* get the new_targets object */
  static NewTargets *get (void);

  /* insert targets to the new_targets_queue */
  static unsigned long insert (const char *target);
private:
  /* unsigned long mex_new_targets; */

  /* A queue to push new targets that were discovered by NSE scripts.
   * Nmap will pop future targets from this queue. */
  std::queue<std::string> queue;

  /* A cache to save scanned targets specifiactions.
   * (These are targets that were pushed to Nmap scan queue) */
  std::set<std::string> history;

  void Initialize();

  /* Save new targets onto the queue */
  unsigned long push (const char *target);
protected:
  static NewTargets *new_targets;
};

#endif /* TARGETGROUP_H */