Target.cc

/***************************************************************************
 * Target.cc -- The Target class is a stripped version of the equivalent   *
 * class of Nmap. It holds information and functions mainly pertaining to  *
 * hostnames and IP addresses of the targets.                              *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2021 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, we are happy to help.  As mentioned above, we also *
 * offer an 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 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 12955 2009-04-15 00:37:03Z fyodor $ */

#include "NcrackOps.h"
#include "Target.h"
#include "nbase.h"
#include "utils.h"

extern NcrackOps o;
using namespace std;


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

void Target::Initialize() {
  hostname = NULL;
  targetname = NULL;
  memset(&targetsock, 0, sizeof(targetsock));
  targetsocklen = 0;
  targetipstring[0] = '\0';
  nameIPBuf = NULL;
}


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

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

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;
  }

}

/*  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;
#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()));
  }
}

/* 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);
    setTargetName(NULL);
  }
  memcpy(&targetsock, ss, ss_len);
  targetsocklen = ss_len;
  GenerateIPString();
  // /* 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 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;
}



/* 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(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(*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) {
  assert(buf);
  assert(buflen > 8);
  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() {
  if (!nameIPBuf) 
    nameIPBuf = (char *) safe_malloc(MAXHOSTNAMELEN + INET6_ADDRSTRLEN);
  return NameIP(nameIPBuf, MAXHOSTNAMELEN + INET6_ADDRSTRLEN);
}