nmap/TargetGroup.h

/***************************************************************************
 * 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.                                            *
 *                                                                         *
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 ***************************************************************************/

/* $Id$ */

#ifndef TARGETGROUP_H
#define TARGETGROUP_H

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

#include "nmap.h"

class TargetGroup {
 public:
  /* used by get_target_types */
  enum _targets_types { TYPE_NONE, IPV4_NETMASK, IPV4_RANGES, IPV6_ADDRESS };
  /* used as input to skip range */
  enum _octet_nums { FIRST_OCTET, SECOND_OCTET, THIRD_OCTET };
  TargetGroup();

 /* Initializes (or reinitializes) the object with a new expression,
    such as 192.168.0.0/16 , 10.1.0-5.1-254 , or
    fe80::202:e3ff:fe14:1102 .  The af parameter is AF_INET or
    AF_INET6 Returns 0 for success */
  int parse_expr(const char * const target_expr, int af);
  /* Reset the object without reinitializing it */
  int rewind();
  /* Grab the next host from this expression (if any).  Returns 0 and
     fills in ss if successful.  ss must point to a pre-allocated
     sockaddr_storage structure */
  int get_next_host(struct sockaddr_storage *ss, size_t *sslen);
  /* Returns the last given host, so that it will be given again next
     time get_next_host is called.  Obviously, you should only call
     this if you have fetched at least 1 host since parse_expr() was
     called */
  int return_last_host();
  /* Returns true iff the given address is the one that was resolved to create
     this target group; i.e., not one of the addresses derived from it with a
     netmask. */
  bool is_resolved_address(const struct sockaddr_storage *ss);
  /* Return a string of the name or address that was resolved for this group. */
  const char *get_resolved_name(void);
  /* Return the list of addresses that the name for this group resolved to, if
     it came from a name resolution. */
  const std::list<struct sockaddr_storage> &get_resolved_addrs(void);
  /* return the target type */
  char get_targets_type() {return targets_type;};
  /* get the netmask */
  int get_mask() {return netmask;};
  /* is the current expression a named host */
  int get_namedhost() {return namedhost;};
  /* Skip an octet in the range array */
  int skip_range(_octet_nums octet);
 private:
  enum _targets_types targets_type;
  void Initialize();

#if HAVE_IPV6
  struct sockaddr_in6 ip6;
#endif

  std::list<struct sockaddr_storage> resolvedaddrs;

  /* These are used for the '/mask' style of specifying target 
     net (IPV4_NETMASK) */
  u32 netmask;
  std::string resolvedname;
  struct in_addr startaddr;
  struct in_addr currentaddr;
  struct in_addr endaddr;

  // These three are for the '138.1-7,16,91-95,200-.12.1' style (IPV4_RANGES)
  u8 addresses[4][256];
  unsigned int current[4];
  u8 last[4];  

/* Number of IPs left in this structure -- set to 0 if 
		  the fields are not valid */
  unsigned long long ipsleft; 

  // is the current target expression a named host
  int namedhost;
};

/* 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;
};

class HostGroupState {
 public:
  HostGroupState(int lookahead, int randomize, char *target_expressions[],
		 int num_expressions);
  ~HostGroupState();
  Target **hostbatch;
  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 */
  char **target_expressions; /* An array of target expression strings, passed
				to us by the client (client is also in charge
				of deleting it AFTER it is done with the 
				hostgroup_state */
  int num_expressions;       /* The number of valid expressions in 
				target_expressions member above */
  int next_expression;   /* The index of the next expression we have
			    to handle */
  TargetGroup current_expression; /* For batch chunking -- targets in queue */
};

#endif /* TARGETGROUP_H */