portlist.h

/***************************************************************************
 * portlist.h -- Functions for manipulating various lists of ports         *
 * maintained internally by Nmap.                                          *
 *                                                                         *
 ***********************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 sales@insecure.com).  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        *
 * sales@insecure.com 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 fyodor@insecure.org 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.                                                              *
 *                                                                         *
 ***************************************************************************/

/* $Id$ */

#ifndef PORTLIST_H
#define PORTLIST_H

#include <map>
#include "nbase.h"
#include "nse_main.h"

/* port states */
#define PORT_UNKNOWN 0
#define PORT_CLOSED 1
#define PORT_OPEN 2
#define PORT_FILTERED 3
#define PORT_TESTING 4
#define PORT_FRESH 5
#define PORT_UNFILTERED 6
#define PORT_OPENFILTERED 7 /* Like udp/fin/xmas/null/ipproto scan with no response */
#define PORT_CLOSEDFILTERED 8 /* Idle scan */
#define PORT_HIGHEST_STATE 9 /* ***IMPORTANT -- BUMP THIS UP WHEN STATES ARE 
				ADDED *** */
 
#define TCPANDUDP IPPROTO_MAX

#define CONF_NONE 0
#define CONF_LOW 1
#define CONF_HIGH 2

enum serviceprobestate {
  PROBESTATE_INITIAL=1, // No probes started yet
  PROBESTATE_NULLPROBE, // Is working on the NULL Probe
  PROBESTATE_MATCHINGPROBES, // Is doing matching probe(s)
  PROBESTATE_NONMATCHINGPROBES, // The above failed, is checking nonmatches
  PROBESTATE_FINISHED_HARDMATCHED, // Yay!  Found a match
  PROBESTATE_FINISHED_SOFTMATCHED, // Well, a soft match anyway
  PROBESTATE_FINISHED_NOMATCH, // D'oh!  Failed to find the service.
  PROBESTATE_FINISHED_TCPWRAPPED, // We think the port is blocked via tcpwrappers
  PROBESTATE_EXCLUDED, // The port has been excluded from the scan
  PROBESTATE_INCOMPLETE // failed to complete (error, host timeout, etc.)
};

enum service_detection_type { SERVICE_DETECTION_TABLE, SERVICE_DETECTION_PROBED };

enum service_tunnel_type { SERVICE_TUNNEL_NONE, SERVICE_TUNNEL_SSL };

// Move some popular TCP ports to the beginning of the portlist, because
// that can speed up certain scans.  You should have already done any port
// randomization, this should prevent the ports from always coming out in the
// same order.
void random_port_cheat(u16 *ports, int portcount);

struct serviceDeductions {
  const char *name; // will be NULL if can't determine
  // Confidence is a number from 0 (least confident) to 10 (most
  // confident) expressing how accurate the service detection is
  // likely to be.
  int name_confidence;
  // Any of these 6 can be NULL if we weren't able to determine it
  const char *product;
  const char *version;
  const char *extrainfo;
  const char *hostname;
  const char *ostype;
  const char *devicetype;
  // SERVICE_TUNNEL_NONE or SERVICE_TUNNEL_SSL
  enum service_tunnel_type service_tunnel; 
  // This is the combined version of the three fields above.  It will be 
  // zero length if unavailable.
  char fullversion[128];
  // if we should give the user a service fingerprint to submit, here it is.  Otherwise NULL.
  const char *service_fp; 
  enum service_detection_type dtype; // definition above
  int rpc_status; /* RPC_STATUS_UNTESTED means we haven't checked
		    RPC_STATUS_UNKNOWN means the port appears to be RPC
		    but we couldn't find a match
		    RPC_STATUS_GOOD_PROG means rpc_program gives the prog #
		    RPC_STATUS_NOT_RPC means the port doesn't appear to 
		    be RPC */
  unsigned long rpc_program; /* Only valid if rpc_state == RPC_STATUS_GOOD_PROG */
  unsigned int rpc_lowver;
  unsigned int rpc_highver;

};



class Port {
 public:
  Port();
  ~Port();

  // pass in an allocated struct serviceDeductions (don't worry about initializing, and
  // you don't have to free any internal ptrs.  See the serviceDeductions definition for
  // the fields that are populated.  Returns 0 if at least a name is available.
  int getServiceDeductions(struct serviceDeductions *sd);

  // sname should be NULL if sres is not
  // PROBESTATE_FINISHED_MATCHED. product,version, and/or extrainfo
  // will be NULL if unavailable. Note that this function makes its
  // own copy of sname and product/version/extrainfo.  This function
  // also takes care of truncating the version strings to a
  // 'reasonable' length if neccessary, and cleaning up any unprinable
  // chars. (these tests are to avoid annoying DOS (or other) attacks
  // by malicious services).  The fingerprint should be NULL unless
  // one is available and the user should submit it.  tunnel must be
  // SERVICE_TUNNEL_NULL (normal) or SERVICE_TUNNEL_SSL (means ssl was
  // detected and we tried to tunnel through it ).
  void setServiceProbeResults(enum serviceprobestate sres, const char *sname,
			      enum service_tunnel_type tunnel, const char *product, 
			      const char *version, const char *hostname,
			      const char *ostype, const char *devicetype,
			      const char *extrainfo, const char *fingerprint);

  char* cstringSanityCheck(const char* string, int len);

  /* Sets the results of an RPC scan.  if rpc_status is not
   RPC_STATUS_GOOD_PROGRAM, pass 0 for the other args. This function
   takes care of setting the port's service and version
   appropriately. */
  void setRPCProbeResults(int rpc_status, unsigned long rpc_program, 
			  unsigned int rpc_lowver, unsigned int rpc_highver);

  u16 portno;
  u8 proto;
  char *owner;
  int state; 
  int confidence; /* How sure are we about the state? */

  ScriptResults scriptResults;

 private:
  int rpc_status; /* RPC_STATUS_UNTESTED means we haven't checked
		    RPC_STATUS_UNKNOWN means the port appears to be RPC
		    but we couldn't find a match
		    RPC_STATUS_GOOD_PROG means rpc_program gives the prog #
		    RPC_STATUS_NOT_RPC means the port doesn't appear to 
		    be RPC */
  unsigned long rpc_program; /* Only valid if rpc_state == RPC_STATUS_GOOD_PROG */
  unsigned int rpc_lowver;
  unsigned int rpc_highver;
  Port *next; /* Internal use only -- we sometimes like to link them
			together */
  enum serviceprobestate serviceprobe_results; // overall results of service scan
  char *serviceprobe_service; // If a service was discovered, points to the name
  // Any of these next three can be NULL if the details are not available
  char *serviceprobe_product; 
  char *serviceprobe_version; 
  char *serviceprobe_extrainfo; 
  char *serviceprobe_hostname;
  char *serviceprobe_ostype;
  char *serviceprobe_devicetype;
  enum service_tunnel_type serviceprobe_tunnel;
  // A fingerprint that the user can submit if the service wasn't recognized
  char *serviceprobe_fp;

};


/* Needed enums to address some arrays. This values
 * should never be used directly. Use INPROTO2PORTLISTPROTO macro */
enum portlist_proto {	// PortList Protocols
  PORTLIST_PROTO_TCP	= 0,
  PORTLIST_PROTO_UDP	= 1,
  PORTLIST_PROTO_IP	= 2,
  PORTLIST_PROTO_MAX	= 3
};

class PortList {
 public:
  PortList();
  ~PortList();
  /* Set ports that will be scanned for each protocol. This function
   * must be called before any PortList object will be created. */
  static void initializePortMap(int protocol, u16 *ports, int portcount);
  /* Free memory used by port_map. It should be done somewhere before quitting*/
  static void freePortMap();
  
  /* Add a new port to this list.  If the state has changed, it is
     OK to call this function to effect the change */
  int addPort(u16 portno, u8 protocol, char *owner, int state);
  int removePort(u16 portno, u8 protocol);
  /* Saves an identification string for the target containing these
     ports (an IP addrss might be a good example, but set what you
     want).  Only used when printing new port updates.  Optional.  A
     copy is made. */
  void setIdStr(const char *id);
  /* A function for iterating through the ports.  Give NULL for the
   first "afterthisport".  Then supply the most recent returned port
   for each subsequent call.  When no more matching ports remain, NULL
   will be returned.  To restrict returned ports to just one protocol,
   specify IPPROTO_TCP or IPPROTO_UDP for allowed_protocol. A TCPANDUDP
   for allowed_protocol matches either. A 0 for allowed_state matches 
   all possible states. This function returns ports in numeric
   order from lowest to highest, except that if you ask for both TCP &
   UDP, every TCP port will be returned before we start returning UDP
   ports */
   Port *nextPort(Port *afterthisport, 
  	          int allowed_protocol, int allowed_state);

  /* Get Port structure from PortList structure.*/
  Port *getPortEntry(u16 portno, u8 protocol);
  /* Set Port structure to PortList structure.*/
  void  setPortEntry(u16 portno, u8 protocol, Port *port);

  int numports; /* Total number of ports in list in ANY state */
  int numscriptresults; /* Total number of scripts which produced output */

  /* Get number of ports in this state. This a sum for protocols. */
  int getStateCounts(int state);
  /* Get number of ports in this state for requested protocol. */
  int getStateCounts(int protocol, int state);

  /* Cycles through the 0 or more "ignored" ports which should be
   consolidated for Nmap output.  They are returned sorted by the
   number of prots in the state, starting with the most common.  It
   should first be called with PORT_UNKNOWN to obtain the most popular
   ignored state (if any).  Then call with that state to get the next
   most popular one.  Returns the state if there is one, but returns
   PORT_UNKNOWN if there are no (more) states which qualify for
   consolidation */
  int nextIgnoredState(int prevstate);

  /* Returns true if a state should be ignored (consolidated), false otherwise */
  bool isIgnoredState(int state);

  int numIgnoredStates();
  int numIgnoredPorts();

 private:
  /* A string identifying the system these ports are on.  Just used for 
     printing open ports, if it is set with setIdStr() */
  char *idstr;
  /* Number of ports in each state per each protocol */
  int state_counts_proto[PORTLIST_PROTO_MAX][PORT_HIGHEST_STATE];
  Port **port_list[PORTLIST_PROTO_MAX];
 protected:
  /* Maps port_number to index in port_list array.
   * Only functions: getPortEntry, setPortEntry, initializePortMap and 
   * nextPort should access this structure directly. */
  static u16 *port_map[PORTLIST_PROTO_MAX];
  /* Number of allocated elements in port_list per each protocol. */
  static int port_list_count[PORTLIST_PROTO_MAX];
};

#endif