File: 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) 1996-2016 Insecure.Com LLC ("The Nmap  *
 * Project"). Nmap is also a registered trademark of the Nmap Project.     *
 * 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 ("GPL"), BUT ONLY WITH ALL OF THE   *
 * CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN.  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 sales@nmap.com).        *
 * Dozens of software vendors already license Nmap technology such as      *
 * host discovery, port scanning, OS detection, version detection, and     *
 * the Nmap Scripting Engine.                                              *
 *                                                                         *
 * Note that the GPL places important restrictions on "derivative works",  *
 * yet it does not provide a detailed definition of that term.  To avoid   *
 * misunderstandings, we interpret that term as broadly as copyright law   *
 * allows.  For example, we consider an application to constitute a        *
 * derivative work for the purpose of this license if it does any of the   *
 * following with any software or content covered by this license          *
 * ("Covered Software"):                                                   *
 *                                                                         *
 * o Integrates source code from Covered Software.                         *
 *                                                                         *
 * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db   *
 * or nmap-service-probes.                                                 *
 *                                                                         *
 * o Is designed specifically to execute Covered Software and parse the    *
 * results (as opposed to typical shell or execution-menu apps, which will *
 * execute anything you tell them to).                                     *
 *                                                                         *
 * o Includes Covered Software in a proprietary executable installer.  The *
 * installers produced by InstallShield are an example of this.  Including *
 * Nmap with other software in compressed or archival form does not        *
 * trigger this provision, provided appropriate open source decompression  *
 * or de-archiving software is widely available for no charge.  For the    *
 * purposes of this license, an installer is considered to include Covered *
 * Software even if it actually retrieves a copy of Covered Software from  *
 * another source during runtime (such as by downloading it from the       *
 * Internet).                                                              *
 *                                                                         *
 * o Links (statically or dynamically) to a library which does any of the  *
 * above.                                                                  *
 *                                                                         *
 * o Executes a helper program, module, or script to do any of the above.  *
 *                                                                         *
 * This list is not exclusive, but is meant to clarify our interpretation  *
 * of derived works with some common examples.  Other people may interpret *
 * the plain GPL differently, so we consider this a special exception to   *
 * the GPL that we apply to Covered Software.  Works which meet any of     *
 * these conditions must conform to all of the terms of this license,      *
 * particularly including the GPL Section 3 requirements of providing      *
 * source code and allowing free redistribution of the work as a whole.    *
 *                                                                         *
 * As another special exception to the GPL terms, the Nmap Project 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 docs/licenses/OpenSSL.txt file, and distribute   *
 * linked combinations including the two.                                  *
 *                                                                         * 
 * The Nmap Project has permission to redistribute Npcap, a packet         *
 * capturing driver and library for the Microsoft Windows platform.        *
 * Npcap is a separate work with it's own license rather than this Nmap    *
 * license.  Since the Npcap license does not permit redistribution        *
 * without special permission, our Nmap Windows binary packages which      *
 * contain Npcap may not be redistributed without special permission.      *
 *                                                                         *
 * Any redistribution of Covered Software, including any derived works,    *
 * must obey and carry forward all of the terms of this license, including *
 * obeying all GPL rules and restrictions.  For example, source code of    *
 * the whole work must be provided and free redistribution must be         *
 * allowed.  All GPL references to "this License", are to be treated as    *
 * including the terms and conditions of this license text as well.        *
 *                                                                         *
 * Because this license imposes special exceptions to the GPL, Covered     *
 * Work may not be combined (even as part of a larger work) with plain GPL *
 * software.  The terms, conditions, and exceptions of this license must   *
 * be included as well.  This license is incompatible with some other open *
 * source licenses as well.  In some cases we can relicense portions of    *
 * Nmap or grant special permissions to use it in other open source        *
 * software.  Please contact fyodor@nmap.org with any such requests.       *
 * Similarly, we don't incorporate incompatible open source software into  *
 * Covered Software without special permission from the copyright holders. *
 *                                                                         *
 * If you have any questions about the licensing restrictions on using     *
 * Nmap in other works, are 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.  They also fund the      *
 * continued development of Nmap.  Please email sales@nmap.com for further *
 * information.                                                            *
 *                                                                         *
 * If you have received a written license agreement or contract for        *
 * Covered Software stating terms other than these, you may choose to use  *
 * and redistribute Covered Software under those terms instead of these.   *
 *                                                                         *
 * 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.          *
 *                                                                         *
 * 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 the dev@nmap.org mailing list for possible incorporation into the    *
 * main distribution.  By sending these changes to Fyodor or one of the    *
 * Insecure.Org development mailing lists, or checking them into the Nmap  *
 * source code repository, it is understood (unless you specify            *
 * otherwise) that you are offering the Nmap Project 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 Nmap      *
 * license file for more details (it's in a COPYING file included with     *
 * Nmap, and also available from https://svn.nmap.org/nmap/COPYING)        *
 *                                                                         *
 ***************************************************************************/

/* $Id: Target.cc 36488 2016-12-14 00:12:23Z fyodor $ */

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

#include "Target.h"
#include "FingerPrintResults.h" /* for ~FingerPrintResults() */
#include <dnet.h>
#include "nbase.h"
#include "NmapOps.h"
#include "utils.h"
#include "nmap.h"
#include "nmap_error.h"

extern NmapOps o;

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

void Target::Initialize() {
  hostname = NULL;
  targetname = NULL;
  memset(&seq, 0, sizeof(seq));
  distance = -1;
  distance_calculation_method = DIST_METHOD_NONE;
  FPR = NULL;
  osscan_flag = OS_NOTPERF;
  weird_responses = flags = 0;
  traceroute_probespec.type = PS_NONE;
  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';
  sourceipstring[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;
  htn.host_start = htn.host_end = 0;
  interface_type = devt_other;
  devname[0] = '\0';
  devfullname[0] = '\0';
  mtu = 0;
  state_reason_init(&reason);
  memset(&pingprobe, 0, sizeof(pingprobe));
  pingprobe_state = PORT_UNKNOWN;
}


const char * Target::deviceName() const {
        return (devname[0] != '\0')? devname : NULL;
}

const char * Target::deviceFullName() const {
        return (devfullname[0] != '\0')? devfullname : NULL;
}

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

Target::~Target() {
  FreeInternal();
#ifndef NOLUA
  while (!scriptResults.empty()) {
    scriptResults.front().clear();
    scriptResults.pop_front();
  }
#endif
}

void Target::FreeInternal() {
  /* Free the DNS name if we resolved one */
  if (hostname)
    free(hostname);

  if (targetname)
    free(targetname);

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

  if (FPR) delete FPR;
}

/*  Creates a "presentation" formatted string out of the IPv4/IPv6 address.
    Called when the IP changes */
void Target::GenerateTargetIPString() {
  struct sockaddr_in *sin = (struct sockaddr_in *) &targetsock;
#if HAVE_IPV6
  struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &targetsock;
#endif

  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()));
  }
}

/*  Creates a "presentation" formatted string out of the IPv4/IPv6 address.
    Called when the IP changes */
void Target::GenerateSourceIPString() {
  struct sockaddr_in *sin = (struct sockaddr_in *) &sourcesock;
#if HAVE_IPV6
  struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &sourcesock;
#endif

  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
                sourceipstring, sizeof(sourceipstring)) == NULL) {
    fatal("Failed to convert source address to presentation format!?!  Error: %s", strerror(socket_errno()));
  }
}

/* Returns the address family of the destination address. */
int Target::af() const {
  return targetsock.ss_family;
}

/* 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) const {
  assert(ss);
  assert(ss_len);
  if (targetsocklen <= 0)
    return 1;
  assert(targetsocklen <= sizeof(*ss));
  memcpy(ss, &targetsock, targetsocklen);
  *ss_len = targetsocklen;
  return 0;
}

const struct sockaddr_storage *Target::TargetSockAddr() const {
  return &targetsock;
}

/* Note that it is OK to pass in a sockaddr_in or sockaddr_in6 casted
     to sockaddr_storage */
void Target::setTargetSockAddr(const 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);
    setTargetName(NULL);
  }
  memcpy(&targetsock, ss, ss_len);
  targetsocklen = ss_len;
  GenerateTargetIPString();
  /* The ports array needs to know a name too */
  ports.setIdStr(targetipstr());
}

// Returns IPv4 host address or {0} if unavailable.
struct in_addr Target::v4host() const {
  const struct in_addr *addy = v4hostip();
  struct in_addr in;
  if (addy) return *addy;
  in.s_addr = 0;
  return in;
}

// Returns IPv4 host address or NULL if unavailable.
const struct in_addr *Target::v4hostip() const {
  struct sockaddr_in *sin = (struct sockaddr_in *) &targetsock;
  if (sin->sin_family == AF_INET) {
    return &(sin->sin_addr);
  }
  return NULL;
}

const struct in6_addr *Target::v6hostip() const {
  struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &targetsock;
  if (sin6->sin6_family == AF_INET6) {
    return &(sin6->sin6_addr);
  }
  return NULL;
}

 /* The source address used to reach the target */
int Target::SourceSockAddr(struct sockaddr_storage *ss, size_t *ss_len) const {
  if (sourcesocklen <= 0)
    return 1;
  assert(sourcesocklen <= sizeof(*ss));
  if (ss)
    memcpy(ss, &sourcesock, sourcesocklen);
  if (ss_len)
    *ss_len = sourcesocklen;
  return 0;
}

const struct sockaddr_storage *Target::SourceSockAddr() const {
  return &sourcesock;
}

/* Note that it is OK to pass in a sockaddr_in or sockaddr_in6 casted
     to sockaddr_storage */
void Target::setSourceSockAddr(const struct sockaddr_storage *ss, size_t ss_len) {
  assert(ss_len > 0 && ss_len <= sizeof(*ss));
  memcpy(&sourcesock, ss, ss_len);
  sourcesocklen = ss_len;
  GenerateSourceIPString();
}

// Returns IPv4 host address or {0} if unavailable.
struct sockaddr_storage Target::source() const {
  return sourcesock;
}

// Returns IPv4 host address or NULL if unavailable.
const struct in_addr *Target::v4sourceip() const {
  struct sockaddr_in *sin = (struct sockaddr_in *) &sourcesock;
  if (sin->sin_family == AF_INET) {
    return &(sin->sin_addr);
  }
  return NULL;
}

// Returns IPv6 host address or NULL if unavailable.
const struct in6_addr *Target::v6sourceip() const {
  struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &sourcesock;
  if (sin6->sin6_family == AF_INET6) {
    return &(sin6->sin6_addr);
  }
  return NULL;
}

  /* You can set to NULL to erase a name or if it failed to resolve -- or
     just don't call this if it fails to resolve */
void Target::setHostName(const char *name) {
  char *p;
  if (hostname) {
    free(hostname);
    hostname = NULL;
  }
  if (name) {
    p = hostname = strdup(name);
    while (*p) {
      // I think only a-z A-Z 0-9 . and - are allowed, but I'll be a little more
      // generous.
      if (!isalnum((int) (unsigned char) *p) && !strchr(".-+=:_~*", *p)) {
        log_write(LOG_STDOUT, "Illegal character(s) in hostname -- replacing with '*'\n");
        *p = '*';
      }
      p++;
    }
  }
}

void Target::setTargetName(const char *name) {
  if (targetname) {
    free(targetname);
    targetname = NULL;
  }
  if (name) {
    targetname = strdup(name);
  }
}

 /* Generates a printable string consisting of the host's IP
     address and hostname (if available).  Eg "www.insecure.org
     (64.71.184.53)" or "fe80::202:e3ff:fe14:1102".  The name is
     written into the buffer provided, which is also returned.  Results
     that do not fit in buflen will be truncated. */
const char *Target::NameIP(char *buf, size_t buflen) const {
  assert(buf);
  assert(buflen > 8);
  if (targetname)
    Snprintf(buf, buflen, "%s (%s)", targetname, targetipstring);
  else if (hostname)
    Snprintf(buf, buflen, "%s (%s)", hostname, targetipstring);
  else
    Strncpy(buf, targetipstring, buflen);
  return buf;
}

/* This next version returns a static buffer -- so no concurrency */
const char *Target::NameIP() const {
  /* Add 3 characters for the hostname and IP string, hence we allocate
    (FQDN_LEN + INET6_ADDRSTRLEN + 4) octets, with octet for the null terminator */
  if (!nameIPBuf) nameIPBuf = (char *) safe_malloc(FQDN_LEN + INET6_ADDRSTRLEN + 4);
  return NameIP(nameIPBuf, FQDN_LEN + INET6_ADDRSTRLEN + 4);
}

  /* Returns the next hop for sending packets to this host.  Returns true if
     next_hop was filled in.  It might be false, for example, if
     next_hop has never been set */
bool Target::nextHop(struct sockaddr_storage *next_hop, size_t *next_hop_len) {
  if (nexthopsocklen <= 0)
    return false;
  assert(nexthopsocklen <= sizeof(*next_hop));
  if (next_hop)
    memcpy(next_hop, &nexthopsock, nexthopsocklen);
  if (next_hop_len)
    *next_hop_len = nexthopsocklen;
  return true;
}

  /* If the host is directly connected on a network, set and retrieve
     that information here.  directlyConnected() will abort if it hasn't
     been set yet.  */
void Target::setDirectlyConnected(bool connected) {
  directly_connected = connected? 1 : 0;
}

int Target::directlyConnectedOrUnset() const {
    return directly_connected;
}

bool Target::directlyConnected() const {
  assert(directly_connected == 0 || directly_connected == 1);
  return directly_connected;
}

/* Note that it is OK to pass in a sockaddr_in or sockaddr_in6 casted
     to sockaddr_storage */
void Target::setNextHop(struct sockaddr_storage *next_hop, size_t next_hop_len) {
  assert(next_hop_len > 0 && next_hop_len <= sizeof(nexthopsock));
  memcpy(&nexthopsock, next_hop, next_hop_len);
  nexthopsocklen = next_hop_len;
}

/* Set MTU (to correspond with devname) */
void Target::setMTU(int devmtu) {
  mtu = devmtu;
}

/* Get MTU (to correspond with devname) */
int Target::MTU(void) {
  return mtu;
}

  /* Starts the timeout clock for the host running (e.g. you are
     beginning a scan).  If you do not have the current time handy,
     you can pass in NULL.  When done, call stopTimeOutClock (it will
     also automatically be stopped of timedOut() returns true) */
void Target::startTimeOutClock(const struct timeval *now) {
  assert(htn.toclock_running == false);
  htn.toclock_running = true;
  if (now) htn.toclock_start = *now;
  else gettimeofday(&htn.toclock_start, NULL);
  if (!htn.host_start) htn.host_start = htn.toclock_start.tv_sec;
}
  /* The complement to startTimeOutClock. */
void Target::stopTimeOutClock(const struct timeval *now) {
  struct timeval tv;
  assert(htn.toclock_running == true);
  htn.toclock_running = false;
  if (now) tv = *now;
  else gettimeofday(&tv, NULL);
  htn.msecs_used += TIMEVAL_MSEC_SUBTRACT(tv, htn.toclock_start);
  htn.host_end = tv.tv_sec;
}
  /* Returns whether the host is timedout.  If the timeoutclock is
     running, counts elapsed time for that.  Pass NULL if you don't have the
     current time handy.  You might as well also pass NULL if the
     clock is not running, as the func won't need the time. */
bool Target::timedOut(const struct timeval *now) {
  unsigned long used = htn.msecs_used;
  struct timeval tv;

  if (!o.host_timeout) return false;
  if (htn.toclock_running) {
    if (now) tv = *now;
    else gettimeofday(&tv, NULL);
    used += TIMEVAL_MSEC_SUBTRACT(tv, htn.toclock_start);
  }

  return (used > o.host_timeout);
}


/* Returns zero if MAC address set successfully */
int Target::setMACAddress(const u8 *addy) {
  if (!addy) return 1;
  memcpy(MACaddress, addy, 6);
  MACaddress_set = 1;
  return 0;
}

int Target::setSrcMACAddress(const u8 *addy) {
  if (!addy) return 1;
  memcpy(SrcMACaddress, addy, 6);
  SrcMACaddress_set = 1;
  return 0;
}

int Target::setNextHopMACAddress(const u8 *addy) {
  if (!addy) return 1;
  memcpy(NextHopMACaddress, addy, 6);
  NextHopMACaddress_set = 1;
  return 0;
}

/* Set the device names so that they can be returned by deviceName()
   and deviceFullName().  The normal name may not include alias
   qualifier, while the full name may include it (e.g. "eth1:1").  If
   these are non-null, they will overwrite the stored version */
void Target::setDeviceNames(const char *name, const char *fullname) {
  if (name) Strncpy(devname, name, sizeof(devname));
  if (fullname) Strncpy(devfullname, fullname, sizeof(devfullname));
}

/* Returns the 6-byte long MAC address, or NULL if none has been set */
const u8 *Target::MACAddress() const {
  return (MACaddress_set)? MACaddress : NULL;
}

const u8 *Target::SrcMACAddress() const {
  return (SrcMACaddress_set)? SrcMACaddress : NULL;
}

const u8 *Target::NextHopMACAddress() const {
  return (NextHopMACaddress_set)? NextHopMACaddress : NULL;
}

int Target::osscanPerformed(void) {
        return osscan_flag;
}

void Target::osscanSetFlag(int flag) {
        if(osscan_flag == OS_PERF_UNREL)
                return;
        else
                osscan_flag = flag;
}