target.cc

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/***************************************************************************
 * Target.cc -- The Target class encapsulates much of the information Nmap *
 * has about a host.  Results (such as ping, OS scan, etc) are stored in   *
 * this class as they are determined.                                      *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2006 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  *
 * below.  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 sell alternative licenses      *
 * (contact [e-mail]).  Dozens of software vendors already       *
 * license Nmap technology such as host discovery, port scanning, OS       *
 * detection, and version detection.                                       *
 *                                                                         *
 * Note that the GPL places important restrictions on "derived works", yet *
 * it does not provide a detailed definition of that term.  To avoid       *
 * misunderstandings, we consider an application to constitute a           *
 * "derivative work" for the purpose of this license if it does any of the *
 * following:                                                              *
 * o Integrates source code from Nmap                                      *
 * o Reads or includes Nmap copyrighted data files, such as                *
 *   nmap-os-fingerprints or nmap-service-probes.                          *
 * o Executes Nmap and parses the results (as opposed to typical shell or  *
 *   execution-menu apps, which simply display raw Nmap output and so are  *
 *   not derivative works.)                                                * 
 * o Integrates/includes/aggregates Nmap into a proprietary executable     *
 *   installer, such as those produced by InstallShield.                   *
 * o Links to a library or executes a program that does any of the above   *
 *                                                                         *
 * The term "Nmap" should be taken to also include any portions or derived *
 * works of Nmap.  This list is not exclusive, but is just meant to        *
 * clarify our interpretation of derived works with some common examples.  *
 * These restrictions only apply when you actually redistribute Nmap.  For *
 * example, nothing stops you from writing and selling a proprietary       *
 * front-end to Nmap.  Just distribute it by itself, and point people to   *
 * http://insecure.org/nmap/ to download Nmap.                             *
 *                                                                         *
 * We don't consider these to be added restrictions on top of the GPL, but *
 * just a clarification of how we interpret "derived works" as it applies  *
 * to our GPL-licensed Nmap product.  This is similar to the way Linus     *
 * Torvalds has announced his interpretation of how "derived works"        *
 * applies to Linux kernel modules.  Our interpretation refers only to     *
 * Nmap - we don't speak for any other GPL products.                       *
 *                                                                         *
 * If you have any questions about the GPL licensing restrictions on using *
 * Nmap in non-GPL works, we would be happy to help.  As mentioned above,  *
 * we also offer alternative license to integrate Nmap into proprietary    *
 * applications and appliances.  These contracts have been sold to dozens  *
 * of software vendors, and generally include a perpetual license as well  *
 * as providing for priority support and updates as well as helping to     *
 * fund the continued development of Nmap technology.  Please email        *
 * [e-mail] for further information.                             *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included Copying.OpenSSL file, and distribute linked      *
 * combinations including the two. You must obey the GNU GPL in all        *
 * respects for all of the code used other than OpenSSL.  If you modify    *
 * this file, you may extend this exception to your version of the file,   *
 * but you are not obligated to do so.                                     *
 *                                                                         *
 * If you received these files with a written license agreement or         *
 * contract stating terms other than the terms above, then that            *
 * alternative license agreement takes precedence over these comments.     *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
 * This also allows you to audit the software for security holes (none     *
 * have been found so far).                                                *
 *                                                                         *
 * Source code also allows you to port Nmap to new platforms, fix bugs,    *
 * and add new features.  You are highly encouraged to send your changes   *
 * to [e-mail] for possible incorporation into the main         *
 * distribution.  By sending these changes to Fyodor or one the            *
 * Insecure.Org development mailing lists, it is assumed that you are      *
 * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right *
 * to reuse, modify, and relicense the code.  Nmap will always be          *
 * available Open Source, but this is important because the inability to   *
 * relicense code has caused devastating problems for other Free Software  *
 * projects (such as KDE and NASM).  We also occasionally relicense the    *
 * code to third parties as discussed above.  If you wish to specify       *
 * special license conditions of your contributions, just say so when you  *
 * send them.                                                              *
 *                                                                         *
 * This program is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of              *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
 * General Public License for more details at                              *
 * http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included  *
 * with Nmap.                                                              *
 *                                                                         *
 ***************************************************************************/

/* $Id: Target.cc 3869 2006-08-25 01:47:49Z fyodor $ */

#ifdef WIN32
#include "nmap_winconfig.h"
#endif

#include <dnet.h>

#include "Target.h"
#include "osscan.h"
#include "nbase.h"
#include "NmapOps.h"

extern NmapOps o;

Target::Target() {
  Initialize();
}

void Target::Initialize() {
  hostname = NULL;
  memset(&seq, 0, sizeof(seq));
  distance = -1;
  FPR1 = NULL;
  FPR = NULL;
  osscan_performed = 0;
  wierd_responses = flags = 0;
  memset(&to, 0, sizeof(to));
  memset(&targetsock, 0, sizeof(targetsock));
  memset(&sourcesock, 0, sizeof(sourcesock));
  memset(&nexthopsock, 0, sizeof(nexthopsock));
  targetsocklen = sourcesocklen = nexthopsocklen = 0;
  directly_connected = -1;
  targetipstring[0] = '\0';
  nameIPBuf = NULL;
  memset(&MACaddress, 0, sizeof(MACaddress));
  memset(&SrcMACaddress, 0, sizeof(SrcMACaddress));
  memset(&NextHopMACaddress, 0, sizeof(NextHopMACaddress));
  MACaddress_set = SrcMACaddress_set = NextHopMACaddress_set = false;
  htn.msecs_used = 0;
  htn.toclock_running = false;
  interface_type = devt_other;
  devname[0] = devfullname[0] = '\0';
}

void Target::Recycle() {
  FreeInternal();
  Initialize();
}

Target::~Target() {
  FreeInternal();
}

void Target::FreeInternal() {

  /* Free the DNS name if we resolved one */
  if (hostname)
    free(hostname);

  if (nameIPBuf) {
    free(nameIPBuf);
    nameIPBuf = NULL;
  }

  if (FPR1) delete FPR1;
  if (FPR) delete FPR;
}

/*  Creates a "presentation" formatted string out of the IPv4/IPv6 address.
    Called when the IP changes */
void Target::GenerateIPString() {
  struct sockaddr_in *sin = (struct sockaddr_in *) &targetsock;
  struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &targetsock;

  if (inet_ntop(sin->sin_family, (sin->sin_family == AF_INET)? 
                (char *) &sin->sin_addr : 
#if HAVE_IPV6
                (char *) &sin6->sin6_addr, 
#else
                (char *) NULL,
#endif
		targetipstring, sizeof(targetipstring)) == NULL) {
    fatal("Failed to convert target address to presentation format!?!  Error: %s", strerror(socket_errno()));
  }
}

/* Fills a sockaddr_storage with the AF_INET or AF_INET6 address
     information of the target.  This is a preferred way to get the
     address since it is portable for IPv6 hosts.  Returns 0 for
     success. ss_len must be provided.  It is not examined, but is set
     to the size of the sockaddr copied in. */
int Target::TargetSockAddr(struct sockaddr_storage *ss, size_t *ss_len) {
  assert(ss);
  assert(ss_len);  
  if (targetsocklen <= 0)
    return 1;
  assert(targetsocklen <= sizeof(*ss));
  memcpy(ss, &targetsock, targetsocklen);
  *ss_len = targetsocklen;
  return 0;
}

/* Note that it is OK to pass in a sockaddr_in or sockaddr_in6 casted
     to sockaddr_storage */
void Target::setTargetSockAddr(struct sockaddr_storage *ss, size_t ss_len) {

  assert(ss_len > 0 && ss_len <= sizeof(*ss));
  if (targetsocklen > 0) {
    /* We had an old target sock, so we better blow away the hostname as
       this one may be new. */
    setHostName(NULL);
  }
  memcpy(&targetsock, ss, ss_len);
  targetsocklen = ss_len;
  GenerateIPString();
  /* The ports array needs to know a name too */
  ports.setIdStr(targetipstr());