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nmap/nping/nping.h
dmiller 72b6830067 Bump version to 7.98SVN
2025-08-21 20:29:59 +00:00

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/***************************************************************************
* Nping.h -- This file contains general defines and constants used *
* throughout Nping's code. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2025 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* 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 submit your changes as a
* Github PR or by email to the dev@nmap.org mailing list for possible
* incorporation into the main distribution. Unless you specify otherwise, it
* is understood that you are offering us very broad rights to use your
* submissions as described in the Nmap Public Source License Contributor
* Agreement. This is important because we fund the project by selling licenses
* with various terms, and also because the inability to relicense code has
* caused devastating problems for other Free Software projects (such as KDE
* and NASM).
*
* The free version of Nmap 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. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
#ifndef NPING_H
#define NPING_H 1
/* Common library requirements and definitions *******************************/
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <nbase.h>
#include <fcntl.h>
#include <stdarg.h>
#include <errno.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "../libnetutil/netutil.h"
#include "../libnetutil/npacket.h"
#ifdef HAVE_CONFIG_H
#include "nping_config.h"
#else
#ifdef WIN32
#include "nping_winconfig.h"
#endif /* WIN32 */
#endif /* HAVE_CONFIG_H */
#ifndef WIN32
#include <sysexits.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#else
void *malloc();
void *realloc();
#endif
#if STDC_HEADERS || HAVE_STRING_H
#include <string.h>
#if !STDC_HEADERS && HAVE_MEMORY_H
#include <memory.h>
#endif
#endif
#if HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_BSTRING_H
#include <bstring.h>
#endif
#ifndef WIN32
#include <sys/wait.h>
#endif /* !WIN32 */
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
# endif
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
/* Keep assert() defined for security reasons */
#undef NDEBUG
#define MAXLINE 255
/* CONSTANT DEFINES ***********************************************************
* @warning It's better not to play with these, because the code may make *
* SOME assumptions like "defined value A is an integer greater than defined *
* value B" or "value C is an odd integer greater than 0", etc. */
/* VERBOSITY LEVELS */
/* These are the defines for Nping's internal verbosity levels. Every time
* you write code for Nping and you have to print something to the terminal,
* you'll have to choose a verbosity level. You choose a level so your message
* gets printed only when the user has requested messages from that level to be
* printed. For example, we have some calls to output functions that print out
* things like "%d target IPs resolved". We don't want that message to always
* get printed during Nping's execution. We only want it out when the user
* has increase the verbosity.
*
* So the thing here is that there are two things that should be taken
* into account:
* 1. The current verbosity level that user has supplied from the command line
* 2. The verbosity level that we supply in our print calls ( nping_print(),
* nping_warning(), etc...)
*
* Fortunately Nping output functions already take care of checking the
* current verbosity level, so programmers only have to decide which level
* should they specify in their output calls. If you are a programmer and
* you are using nping_print(), nping_warning() or nping_fatal() calls in Nping's code,
* you have to ask yourself: Do I want to print extra information that
* shouldn't be printed by default? Or am I printing important stuff like
* errors, etc, that should almost always be printed out?
*
* In the first case, you will call the output function using a verbosity
* level of VB_0 or higher. Calls that specify VB_0 are printed by default
* as VB_0 is the base verbosity level. Calls that specify VB_1 get printed
* only when the user has incremented verbosity level by at least one using
* option "-v". Same with VB_2 for which the users needs to have specified
* either "-v2" or "-v -v".
*
* In the other case, where you are printing errors etc, you have supply
* levels like QT_1, QT_2, QT_3 or QT_4. Those are called quiet levels.
* They are called quiet levels from a user point of view but they are
* verbose to us, programmers, because calls that supply QT_X levels almost
* always get printed. This is because base verbosity is VB_0 and that
* includes all QT_X levels. So you have to be careful with those. QT_ levels
* should only be used to print important stuff like fatal errors, warnings,
* and some basic running time information. Level QT_4 is the quiet-est one
* and nothing is ever printed out.
*
* Check the comments after each level definition to see how they should be
* used. Here are some examples:
*
* nping_fatal(QT_3,"createIPv4(): NULL pointer supplied.");
* nping_print(DBG_2,"Resolving specified targets...");
* nping_print(VB_0, "Raw packets sent: %llu ", this->stats.getSentPackets() );
*
* */
/* Less verbosity */
#define QT_4 0 /**< No output at all */
#define QT_3 1 /**< Fatal error messages, help info, version number */
#define QT_2 2 /**< Warnings and very limited output(just some statistics) */
#define QT_1 3 /**< Start and timing information but no sent/recv packets */
/* Base level (QT_0 is provided for consistency but should not be used) */
#define QT_0 4 /**< Normal info (sent/recv packets, statistics...) (DEFAULT */
#define VB_0 4 /**< Normal info (sent/recv packets, statistics...) (DEFAULT)*/
/* More verbosity */
#define VB_1 5 /**< Detailed information about times, flags, etc. */
#define VB_2 6 /**< Very detailed information about packets, */
#define VB_3 7 /**< Reserved for future use */
#define VB_4 8 /**< Reserved for future use */
/* DEBUGGING LEVELS */
#define DBG_0 30 /**< No debug information at all (DEFAULT) */
#define DBG_1 31 /**< Very important or high level debug information */
#define DBG_2 32 /**< Important or medium level debug information */
#define DBG_3 33 /**< Regular and low level debug information */
#define DBG_4 34 /**< Messages only a real Nping freak would want to see */
#define DBG_5 35 /**< Enables Nsock (and other libs) basic tracing */
#define DBG_6 36 /**< Enables full Nsock (and other libs) tracing */
#define DBG_7 37 /**< Reserved for future use */
#define DBG_8 38 /**< Reserved for future use */
#define DBG_9 39 /**< Reserved for future use */
#define MAX_IP_PACKET_LEN 65535 /**< Max len of an IP datagram */
#define MAX_UDP_PAYLOAD_LEN 65507 /**< Check comments in UDPHeader::setSum() */
#define MAX_DEV_LEN 128 /**< Max network interface name length */
#define NO_NEWLINE 0x8000 /**< Used in nping_fatal(), nping_warning() and nping_print() */
/** Bit count for number parsing functions */
#define RANGE_8_BITS 8
#define RANGE_16_BITS 16
#define RANGE_32_BITS 32
#define RANGE_64_BITS 64
/* Crypto Lengths */
#define CIPHER_BLOCK_SIZE (128/8)
#define CIPHER_KEY_LEN (128/8)
#define MAC_KEY_LEN (128/8)
/* General tunable defines **************************************************/
#define NPING_NAME "Nping"
#define NPING_URL "https://nmap.org/nping"
#define NPING_VERSION "0.7.98SVN"
#define DEFAULT_VERBOSITY VB_0
#define DEFAULT_DEBUGGING DBG_0
/**< Default number of probes that are sent to each target */
#define DEFAULT_PACKET_COUNT 5
/* When doing traceroute, the number of packets sent to each host must be
* higher because 5 is probably not enough to reach the average target on the
* Internet. The following paper suggests that internet hosts are no more than
* 30 hops apart, so setting the packet count to 48 when --traceroute is set
* seems like a safe choice.
* Cheng, J., Haining, W. and Kang, GS. (2006). Hop-Count Filtering: An
* Effective Defense Against Spoofed DDoS Traffic. Australian Telecommu-
* nication Networks & Applications Conference (ATNAC). Australia.
* <http://portal.acm.org/citation.cfm?id=948109.948116>
*/
#define TRACEROUTE_PACKET_COUNT 48
#define DEFAULT_DELAY 1000 /**< Milliseconds between each probe */
/** Milliseconds Nping waits for replies after all probes have been sent */
#define DEFAULT_WAIT_AFTER_PROBES 1000
#define DEFAULT_IP_TTL 64 /**< Default IP Time To Live */
#define DEFAULT_IP_TOS 0 /**< Default IP Type of Service */
#define DEFAULT_IPv6_TTL 64 /**< Default IPv6 Hop Limit */
#define DEFAULT_IPv6_TRAFFIC_CLASS 0x00 /**< Default IPv6 Traffic Class */
#define DEFAULT_TCP_TARGET_PORT 80 /**< Default TCP target port */
#define DEFAULT_UDP_TARGET_PORT 40125 /**< Default UDP target port */
#define DEFAULT_UDP_SOURCE_PORT 53 /**< Default UDP source port */
#define DEFAULT_TCP_WINDOW_SIZE 1480 /**< Default TCP Window size */
/**< MTU used when user just supplies option -f but no MTU value */
#define DEFAULT_MTU_FOR_FRAGMENTATION 72
#define DEFAULT_ICMP_TYPE 8 /**< Default ICMP message: Echo Request */
#define DEFAULT_ICMP_CODE 0 /**< Default ICMP code: 0 (standard) */
#define DEFAULT_ICMPv6_TYPE 128 /**< Default ICMPv6 message: Echo Request */
#define DEFAULT_ICMPv6_CODE 0 /**< Default ICMPv6 code: 0 (standard) */
#define DEFAULT_ARP_OP 1 /**< Default ARP operation: OP_ARP_REQUEST */
/* WARNING: This is the max length for UDP and TCP payloads. Whatever you set
* here, it cannot exceed the worst case:
* 65535 bytes - IPv6Header with options - TCP Header with options. */
#define MAX_PAYLOAD_ALLOWED 65400
/* I've tested this on a GNU/Linux 2.6.24 and I've seen that if the length
* of the whole IP packet is more than 16436 when using loopback interface or
* more than 1500 when using a normal network interface, the kernel complains
* and says "Message too long". This is obviously caused by the configured
* MTU. So the thing is that although we allow users to specify payloads up to
* MAX_PAYLOAD_ALLOWED bytes, when we generate random payloads, we set our
* on limit on 1500-20-20=1460 bytes. Let's be conservative and consider that
* IP packet has 40bytes of options and TCP has 20. So max length should be
* 1500-60-40 = 1400. */
#define MAX_RANDOM_PAYLOAD 1400
#define MAX_RECOMMENDED_PAYLOAD 1400
/* Cached hosts in resolveChached() and gethostbynameCached() */
#define MAX_CACHED_HOSTS 512
#define MAX_CACHED_HOSTNAME_LEN 512
/* (9929 because is prime as has not been assigned by IANA yet) */
#define DEFAULT_ECHO_PORT 9929
/* The echo server tries to zero any application layer data before echoing
* network packets. However, sometimes we may not be able to successfully
* parse a given packet (decide whether the packet contains application data
* or not), so this define specifies the amount of bytes of a packet that the
* server does not zero in such case. 40 bytes allows IPv4+TCP, an IPv6 header,
* an IPv4+UDP+12payload bytes, etc. In the case of UDP, the first 12 data bytes
* would be leaked. However, we should be able to parse simple IPv4-UDP packets
* without problem, so it should never happen. We expect to use this constant
* when received packets are really weird (eg. tunneled traffic, protocols we
* don't understand, etc. The 40 bytes are a compromise between dropping the
* packet but provide total protection against data leakage due to attacks to
* the echo server, and providing some flexibility at the risk of leaking
* a few bytes if an attacker is able to trick the echo server into echoing
* packets that were not originated by him. */
#define PAYLOAD_ECHO_BYTES_IN_DOUBT 40
#define NSOCK_INFINITE -1
/* Prototypes for nping.cc shared functions */
char *getBPFFilterString();
#endif
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