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timing.h

/***************************************************************************
 * timing.h -- Functions related to computing scan timing (such as keeping *
 * track of and adjusting smoothed round trip times, statistical           *
 * deviations, timeout values, etc.  Various user options (such as the     *
 * timing policy (-T)) also play a role in these calculations.             *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
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 * also a registered trademark of Insecure.Com LLC.  This program is free  *
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 *                                                                         *
 ***************************************************************************/

/* $Id: timing.h 6633 2007-12-22 06:32:03Z fyodor $ */

#ifndef NMAP_TIMING_H
#define NMAP_TIMING_H

#include "nmap.h"
#include "global_structures.h"

/* Call this function on a newly allocated struct timeout_info to
   initialize the values appropriately */
void initialize_timeout_info(struct timeout_info *to);

/* Same as adjust_timeouts(), except this one allows you to specify
 the receive time too (which could be because it was received a while
 back or it could be for efficiency because the caller already knows
 the current time */
void adjust_timeouts2(const struct timeval *sent, 
                  const struct timeval *received, 
                  struct timeout_info *to);

/* Adjust our timeout values based on the time the latest probe took for a 
   response.  We update our RTT averages, etc. */
void adjust_timeouts(struct timeval sent, struct timeout_info *to);


/* Sleeps if necessary to ensure that it isn't called twice within less
   time than o.send_delay.  If it is passed a non-null tv, the POST-SLEEP
   time is recorded in it */
void enforce_scan_delay(struct timeval *tv);

class ScanProgressMeter {
 public:
  /* A COPY of stypestr is made and saved for when stats are printed */
  ScanProgressMeter(char *stypestr);
  ~ScanProgressMeter();
/* Decides whether a timing report is likely to even be
   printed.  There are stringent limitations on how often they are
   printed, as well as the verbosity level that must exist.  So you
   might as well check this before spending much time computing
   progress info.  now can be NULL if caller doesn't have the current
   time handy.  Just because this function returns true does not mean
   that the next printStatsIfNeccessary will always print something.
   It depends on whether time estimates have changed, which this func
   doesn't even know about. */
  bool mayBePrinted(const struct timeval *now);

/* Prints an estimate of when this scan will complete.  It only does
   so if mayBePrinted() is true, and it seems reasonable to do so
   because the estimate has changed significantly.  Returns whether
   or not a line was printed.*/
  bool printStatsIfNeccessary(double perc_done, const struct timeval *now);

  /* Prints an estimate of when this scan will complete. */
  bool printStats(double perc_done, const struct timeval *now);

  /* Prints that this task is complete. */
  bool endTask(const struct timeval *now, const char *additional_info) { return beginOrEndTask(now, additional_info, false); }

  struct timeval begin; /* When this ScanProgressMeter was instantiated */
 private:
  struct timeval last_print_test; /* Last time printStatsIfNeccessary was called */
  struct timeval last_print; /* The most recent time the ETC was printed */
  char *scantypestr;
  struct timeval last_est; /* The latest PRINTED estimate */

  bool beginOrEndTask(const struct timeval *now, const char *additional_info, bool beginning);
};

#endif /* NMAP_TIMING_H */


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