nmap/reason.h

/***************************************************************************
 * reason.cc -- Verbose packet-level information on port states            *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2004 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.  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 may be  *
 * willing to sell alternative licenses (contact sales@insecure.com).      *
 * Many security scanner vendors already license Nmap technology such as   *
 * our remote OS fingerprinting database and code, service/version         *
 * detection system, and port scanning code.                               *
 *                                                                         *
 * 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://www.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 many    *
 * security 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.                                                              *
 *                                                                         *
 ***************************************************************************/

/*
 * Written by Eddie Bell <ejlbell@gmail.com> 2007
 */

#ifndef REASON_H
#define REASON_H

#ifdef WIN32
#include "winsock2.h"
#else
#include <netinet/in.h>
#endif

class Target;
class PortList;

typedef unsigned short reason_t;

/* stored inside a Port Object and describes
 * why a port is in a specific state */
typedef struct port_reason {
	reason_t reason_id;
	struct in_addr ip_addr;
	unsigned short ttl;
	int state;
} state_reason_t;

/* used to calculate state reason summaries.
 * I.E 10 ports filter because of 10 no-responses */
typedef struct port_reason_summary {
	reason_t reason_id;
	unsigned int count;
	struct port_reason_summary *next;
} state_reason_summary_t;

/* reason.h:reason_codes and reason.cc:reason_str must stay in sync */
enum reason_codes {
	ER_RESETPEER=0, ER_CONREFUSED, ER_CONACCEPT, 
	ER_SYNACK, ER_UDPRESPONSE, ER_PROTORESPONSE, 
	ER_NETUNREACH, ER_HOSTUNREACH, ER_PROTOUNREACH,
	ER_PORTUNREACH, ER_ECHOREPLY,  /* 10 */

	ER_DESTUNREACH=13, ER_SOURCEQUENCH, ER_NETPROHIBITED,
	ER_HOSTPROHIBITED, ER_ADMINPROHIBITED=19,
	ER_TIMEEXCCEDED=21, ER_TIMESTAMPREPLY=24,

	ER_ADDRESSMASKREPLY=28, ER_NOIPIDCHANGE, ER_IPIDCHANGE,
	ER_ARPRESPONSE, ER_TCPRESPONSE, ER_NORESPONSE,
	ER_LOCALHOST, ER_UNKNOWN, ER_MAX=ER_UNKNOWN   /* 36 */
};

/* Be careful to update these values if any ICMP
 * ER_* definitions are modified.
 *
 * ICMP ER_* codes are calculated by adding the 
 * offsets below to an ICMP packets code/type value */
#define ER_ICMPCODE_MOD 6  
#define ER_ICMPTYPE_MOD 10  

/* passed to the print_state_summary.
 * STATE_REASON_EMPTY will append to the current line, prefixed with " because of"
 * STATE_REASON_FULL will start a new line, prefixed with "Reason:" */
#define STATE_REASON_EMPTY 0
#define STATE_REASON_FULL 1

/* Passed to reason_str to determine if string should be in
 * plural of singular form */
#define SINGULAR 1
#define PLURAL 2

void state_reason_init(state_reason_t *reason);

/* converts a reason_id to a string. number represents the 
 * amount ports in a given state. If there is more then one 
 * port the plural is used, otherwise the singular is used. */
const char *reason_str(reason_t reason_id, unsigned int number);

/* Displays reason summary messages */
void print_state_summary(PortList *Ports, unsigned short type);
void print_xml_state_summary(PortList *Ports, int state);

/* Build an output string based on reason and source ip address.
 * Uses static return value so previous values will be over
 * written by subsequent calls */
char *port_reason_str(state_reason_t r);
char *target_reason_str(Target *t);

#endif