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FingerPrintResults.cc

/***************************************************************************
 * FingerPrintResults -- The FingerPrintResults class the results of OS    *
 * fingerprint matching against a certain host.                            *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2004 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.  This guarantees your right to use,     *
 * modify, and redistribute this software under certain conditions.  If    *
 * you wish to embed Nmap technology into proprietary software, we may be  *
 * willing to sell alternative licenses (contact sales@insecure.com).      *
 * Many security scanner vendors already license Nmap technology such as  *
 * our remote OS fingerprinting database and code, service/version         *
 * detection system, and port scanning code.                               *
 *                                                                         *
 * Note that the GPL places important restrictions on "derived works", yet *
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 * o Integrates source code from Nmap                                      *
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 *   not derivative works.)                                                * 
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 *                                                                         *
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 *                                                                         *
 ***************************************************************************/

/* $Id: FingerPrintResults.cc,v 1.7 2004/08/29 09:12:02 fyodor Exp $ */

#include "FingerPrintResults.h"
#include "osscan.h"
#include "NmapOps.h"

extern NmapOps o;

FingerPrintResults::FingerPrintResults() {
  num_perfect_matches = num_matches = 0;
  overall_results = OSSCAN_NOMATCHES;
  memset(accuracy, 0, sizeof(accuracy));
  isClassified = false;
  osscan_opentcpport = osscan_closedtcpport = -1;
  memset(FPs, 0, sizeof(FPs));
  numFPs = goodFP = 0;
}

FingerPrintResults::~FingerPrintResults() {
  int i;

  /* Free OS fingerprints of OS scanning was done */
  for(i=0; i < numFPs; i++) {
    freeFingerPrint(FPs[i]);
    FPs[i] = NULL;
  }
  numFPs = 0;

}

const struct OS_Classification_Results *FingerPrintResults::getOSClassification() {
  if (!isClassified) { populateClassification(); isClassified = true; }
  return &OSR;
}

  /* Are the attributes of this fingerprint good enough to warrant submission to the official DB? */
bool FingerPrintResults::fingerprintSuitableForSubmission() {
  // TODO:  There are many more tests I could (and should) add.  Maybe related to
  // UDP test, TTL, etc.
  if (o.scan_delay > 500) // This can screw up the sequence timing
    return false;

  if (osscan_opentcpport < 0 || osscan_closedtcpport < 0 ) // then results won't be complete
    return false;

  return true;
}


/* Goes through fingerprinting results to populate OSR */
void FingerPrintResults::populateClassification() {
  int printno, classno;

  OSR.OSC_num_perfect_matches = OSR.OSC_num_matches = 0;
  OSR.overall_results = OSSCAN_SUCCESS;

  if (overall_results == OSSCAN_TOOMANYMATCHES) {
    // The normal classification overflowed so we don't even have all the perfect matches,
    // I don't see any good reason to do classification.
    OSR.overall_results = OSSCAN_TOOMANYMATCHES;
    return;
  }

  for(printno = 0; printno < num_matches; printno++) {
    // a single print may have multiple classifications
    for(classno = 0; classno < prints[printno]->num_OS_Classifications; classno++) {
      if (!classAlreadyExistsInResults(&(prints[printno]->OS_class[classno]))) {
      // Then we have to add it ... first ensure we have room
      if (OSR.OSC_num_matches == MAX_FP_RESULTS) {
        // Out of space ... if the accuracy of this one is 100%, we have a problem
        if (accuracy[printno] == 1.0) OSR.overall_results = OSSCAN_TOOMANYMATCHES;
        return;
      }

      // We have space, but do we even want this one?  No point
      // including lesser matches if we have 1 or more perfect
      // matches.
      if (OSR.OSC_num_perfect_matches > 0 && accuracy[printno] < 1.0) {
        return;
      }

      // OK, we will add the new class
      OSR.OSC[OSR.OSC_num_matches] = &(prints[printno]->OS_class[classno]);
      OSR.OSC_Accuracy[OSR.OSC_num_matches] = accuracy[printno];
      if (accuracy[printno] == 1.0) OSR.OSC_num_perfect_matches++;
      OSR.OSC_num_matches++;
      }
    }
  }

  if (OSR.OSC_num_matches == 0)
    OSR.overall_results = OSSCAN_NOMATCHES;

  return;
}

// Go through any previously enterted classes to see if this is a dupe;
bool FingerPrintResults::classAlreadyExistsInResults(struct OS_Classification *OSC) {
  int i;

  for (i=0; i < OSR.OSC_num_matches; i++) {
    if (!strcmp(OSC->OS_Vendor, OSR.OSC[i]->OS_Vendor)  &&
      !strcmp(OSC->OS_Family, OSR.OSC[i]->OS_Family)  &&
      !strcmp(OSC->Device_Type, OSR.OSC[i]->Device_Type) &&
      !strcmp(OSC->OS_Generation? OSC->OS_Generation : "", 
            OSR.OSC[i]->OS_Generation? OSR.OSC[i]->OS_Generation : "")) {
    // Found a duplicate!
    return true;
    }
  }

  // Went through all the results -- no duplicates found
  return false;
}


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