/***************************************************************************
 * targets.h -- Functions relating to "ping scanning" as well as           *
 * determining the exact IPs to hit based on CIDR and other input formats. *
 *                                                                         *
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 ***************************************************************************/

/* $Id$ */

#ifndef TARGETS_H
#define TARGETS_H

#include "TargetGroup.h"
#include <list>
#include <nbase.h>
class Target;

class HostGroupState {
public:
  /* The maximum number of entries we want to allow storing in defer_buffer. */
  static const unsigned int DEFER_LIMIT = 64;

  HostGroupState(int lookahead, int randomize, int argc, const char *argv[]);
  ~HostGroupState();
  Target **hostbatch;

  /* The defer_buffer is a place to store targets that have previously been
     returned but that can't be used right now. They wait in defer_buffer until
     HostGroupState::undefer is called, at which point they all move to the end
     of the undeferred list. HostGroupState::next_target always pulls from the
     undeferred list before returning anything new. */
  std::list<Target *> defer_buffer;
  std::list<Target *> undeferred;

  int argc;
  const char **argv;
  int max_batch_sz; /* The size of the hostbatch[] array */
  int current_batch_sz; /* The number of VALID members of hostbatch[] */
  int next_batch_no; /* The index of the next hostbatch[] member to be given
                        back to the user */
  int randomize; /* Whether each batch should be "shuffled" prior to the ping
                    scan (they will also be out of order when given back one
                    at a time to the client program */
  TargetGroup current_group; /* For batch chunking -- targets in queue */

  /* Returns true iff the defer buffer is not yet full. */
  bool defer(Target *t);
  void undefer();
  const char *next_expression();
  Target *next_target();
};

/* ports is used to pass information about what ports to use for host discovery */
Target *nexthost(HostGroupState *hs, struct addrset *exclude_group,
                 const struct scan_lists *ports, int pingtype);
int load_exclude_file(struct addrset *exclude_group, FILE *fp);
int load_exclude_string(struct addrset *exclude_group, const char *s);
/* a debugging routine to dump an exclude list to stdout. */
int dumpExclude(const struct addrset *exclude_group);
/* Returns the last host obtained by nexthost.  It will be given again the next
   time you call nexthost(). */
void returnhost(HostGroupState *hs);


bool target_needs_new_hostgroup(Target **targets, int targets_sz, const Target *target);

#endif /* TARGETS_H */