targets.cc

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/***************************************************************************
 * targets.cc -- Functions relating to "ping scanning" as well as          *
 * determining the exact IPs to hit based on CIDR and other input          *
 * formats.                                                                *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
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 * with Nmap.                                                              *
 *                                                                         *
 ***************************************************************************/

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


#include "targets.h"
#include "timing.h"
#include "NmapOps.h"
#include "TargetGroup.h"
#include "Target.h"
#include "scan_engine.h"
#include "nmap_dns.h"
#include "nmap_tty.h"
#include "utils.h"

using namespace std;
extern NmapOps o;
enum pingstyle { pingstyle_unknown, pingstyle_rawtcp, pingstyle_rawudp, pingstyle_connecttcp, 
		 pingstyle_icmp };

/* Gets the host number (index) of target in the hostbatch array of
 pointers.  Note that the target MUST EXIST in the array or all
 heck will break loose. */
static inline int gethostnum(Target *hostbatch[], Target *target) {
  int i = 0;
  do {
    if (hostbatch[i] == target)
      return i;
  } while(++i);

  fatal("fluxx0red");
  return 0; // Unreached
}

char *readhoststate(int state) {
  switch(state) {
  case HOST_UP:
    return "HOST_UP";
  case HOST_DOWN:
    return "HOST_DOWN";
  case HOST_FIREWALLED:
    return "HOST_FIREWALLED";
  default:
    return "UNKNOWN/COMBO";
  }
  return NULL;
}

/* Conducts an ARP ping sweep of the given hosts to determine which ones
   are up on a local ethernet network */
static void arpping(Target *hostbatch[], int num_hosts) {
  /* First I change hostbatch into a vector<Target *>, which is what ultra_scan
     takes.  I remove hosts that cannot be ARP scanned (such as localhost) */
  vector<Target *> targets;
  int targetno;
  targets.reserve(num_hosts);

  for(targetno = 0; targetno < num_hosts; targetno++) {
    initialize_timeout_info(&hostbatch[targetno]->to);
    /* Default timout should be much lower for arp */
    hostbatch[targetno]->to.timeout = MIN(o.initialRttTimeout(), 100) * 1000;
    if (!hostbatch[targetno]->SrcMACAddress()) {
      bool islocal = islocalhost(hostbatch[targetno]->v4hostip());
      if (islocal) {
	log_write(LOG_STDOUT|LOG_NORMAL, 
		  "ARP ping: Considering %s UP because it is a local IP, despite no MAC address for device %s\n",
		  hostbatch[targetno]->NameIP(), hostbatch[targetno]->deviceName());
	hostbatch[targetno]->flags &= ~(HOST_DOWN|HOST_FIREWALLED);
	hostbatch[targetno]->flags |= HOST_UP;
      } else {
	log_write(LOG_STDOUT|LOG_NORMAL, 
		  "ARP ping: Considering %s DOWN because no MAC address found for device %s.\n",
		  hostbatch[targetno]->NameIP(), 
		  hostbatch[targetno]->deviceName());
	hostbatch[targetno]->flags &= ~HOST_FIREWALLED;
	hostbatch[targetno]->flags |= HOST_DOWN;
      }
      continue;
    }
    targets.push_back(hostbatch[targetno]);
  }
  if (!targets.empty())
    ultra_scan(targets, NULL, PING_SCAN_ARP);
  return;
}

static void hoststructfry(Target *hostbatch[], int nelem) {
  genfry((unsigned char *)hostbatch, sizeof(Target *), nelem);
  return;
}

/* Returns the last host obtained by nexthost.  It will be given again the next
   time you call nexthost(). */
void returnhost(HostGroupState *hs) {
  assert(hs->next_batch_no > 0);
  hs->next_batch_no--;
}

/* Is the host passed as Target to be excluded, much of this logic had  (mdmcl)
 * to be rewritten from wam's original code to allow for the objects */
static int hostInExclude(struct sockaddr *checksock, size_t checksocklen, 
		  TargetGroup *exclude_group) {
  unsigned long tmpTarget; /* ip we examine */
  int i=0;                 /* a simple index */
  char targets_type;       /* what is the address type of the Target Group */
  struct sockaddr_storage ss; 
  struct sockaddr_in *sin = (struct sockaddr_in *) &ss;
  size_t slen;             /* needed for funct but not used */
  unsigned long mask = 0;  /* our trusty netmask, which we convert to nbo */
  struct sockaddr_in *checkhost;

  if ((TargetGroup *)0 == exclude_group)
    return 0;

  assert(checksocklen >= sizeof(struct sockaddr_in));
  checkhost = (struct sockaddr_in *) checksock;
  if (checkhost->sin_family != AF_INET)
    checkhost = NULL;

  /* First find out what type of addresses are in the target group */
  targets_type = exclude_group[i].get_targets_type();

  /* Lets go through the targets until we reach our uninitialized placeholder */
  while (exclude_group[i].get_targets_type() != TargetGroup::TYPE_NONE)
  { 
    /* while there are still hosts in the target group */
    while (exclude_group[i].get_next_host(&ss, &slen) == 0) {
      tmpTarget = sin->sin_addr.s_addr; 

      /* For Netmasks simply compare the network bits and move to the next
       * group if it does not compare, we don't care about the individual addrs */
      if (targets_type == TargetGroup::IPV4_NETMASK) {
        mask = htonl((unsigned long) (0-1) << 32-exclude_group[i].get_mask());
        if ((tmpTarget & mask) == (checkhost->sin_addr.s_addr & mask)) {
	  exclude_group[i].rewind();
	  return 1;
        }
	else {
	  break;
	}
      } 
      /* For ranges we need to be a little more slick, if we don't find a match
       * we should skip the rest of the addrs in the octet, thank wam for this
       * optimization */
      else if (targets_type == TargetGroup::IPV4_RANGES) {
        if (tmpTarget == checkhost->sin_addr.s_addr) {
          exclude_group[i].rewind();
          return 1;
        }
        else { /* note these are in network byte order */
	  if ((tmpTarget & 0x000000ff) != (checkhost->sin_addr.s_addr & 0x000000ff))
            exclude_group[i].skip_range(TargetGroup::FIRST_OCTET); 
	  else if ((tmpTarget & 0x0000ff00) != (checkhost->sin_addr.s_addr & 0x0000ff00))
            exclude_group[i].skip_range(TargetGroup::SECOND_OCTET); 
	  else if ((tmpTarget & 0x00ff0000) != (checkhost->sin_addr.s_addr & 0x00ff0000))
            exclude_group[i].skip_range(TargetGroup::THIRD_OCTET); 

          continue;
        }
      }
#if HAVE_IPV6
      else if (targets_type == TargetGroup::IPV6_ADDRESS) {
        fatal("exclude file not supported for IPV6 -- If it is important to you, send a mail to [e-mail] so I can guage support\n");
      }
#endif
    }
    exclude_group[i++].rewind();
  }

  /* we did not find the host */
  return 0;
}

/* loads an exclude file into an exclude target list  (mdmcl) */
TargetGroup* load_exclude(FILE *fExclude, char *szExclude) {
  int i=0;			/* loop counter */
  int iLine=0;			/* line count */
  int iListSz=0;		/* size of our exclude target list. 
				 * It doubles in size as it gets
				 *  close to filling up
				 */
  char acBuf[512];
  char *p_acBuf;
  TargetGroup *excludelist;	/* list of ptrs to excluded targets */
  char *pc;			/* the split out exclude expressions */
  char b_file = (char)0;        /* flag to indicate if we are using a file */

  /* If there are no params return now with a NULL list */
  if (((FILE *)0 == fExclude) && ((char *)0 == szExclude)) {
    excludelist=NULL;
    return excludelist;
  }

  if ((FILE *)0 != fExclude)
    b_file = (char)1;

  /* Since I don't know of a realloc equiv in C++, we will just count
   * the number of elements here. */

  /* If the input was given to us in a file, count the number of elements
   * in the file, and reset the file */
  if (1 == b_file) {
    while ((char *)0 != fgets(acBuf,sizeof(acBuf), fExclude)) {
      if ((char *)0 == strchr(acBuf, '\n')) {
        fatal("Exclude file line %d was too long to read.  Exiting.", iLine);
      }
      pc=strtok(acBuf, "\t\n ");	
      while (NULL != pc) {
        iListSz++;
        pc=strtok(NULL, "\t\n ");