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/***************************************************************************
* ncat.h *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 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/
*
***************************************************************************/
/* $Id$ */
#ifndef NCAT_H_
#define NCAT_H_
#include "ncat_config.h"
#include <nbase.h>
#include "nsock.h"
#include "util.h"
#include "sys_wrap.h"
#include "ncat_connect.h"
#include "ncat_core.h"
#include "ncat_exec.h"
#include "ncat_listen.h"
#include "ncat_proxy.h"
#include "ncat_ssl.h"
/* Ncat information for output, etc. */
#define NCAT_NAME "Ncat"
#define NCAT_URL "https://nmap.org/ncat"
#define NCAT_VERSION "7.94SVN"
#ifndef __GNUC__
#ifndef __attribute__
#define __attribute__(x)
#endif
#endif
#define SOCKS_BUFF_SIZE 512
/* structs */
#ifdef WIN32
#pragma pack(1)
#endif
struct socks4_data {
char version;
char type;
unsigned short port;
uint32_t address;
char data[SOCKS_BUFF_SIZE]; // this has to be able to hold FQDN and username
} __attribute__((packed));
struct socks5_connect {
char ver;
unsigned char nmethods;
char methods[3];
} __attribute__((packed));
struct socks5_auth {
char ver; // must be always 1
unsigned char data[SOCKS_BUFF_SIZE];
} __attribute__((packed));
struct socks5_request {
char ver;
char cmd;
char rsv;
char atyp;
unsigned char dst[SOCKS_BUFF_SIZE]; // addr/name and port info
} __attribute__((packed));
#ifdef WIN32
#pragma pack()
#endif
/* defines */
/* Client-mode timeout for reads, infinite */
#define DEFAULT_READ_TIMEOUT -1
/* Client-mode timeout for writes, in msecs */
#define DEFAULT_WRITE_TIMEOUT 2000
/* Client-mode timeout for connection establishment, in msecs */
#define DEFAULT_CONNECT_TIMEOUT 10000
/* The default length of Ncat buffers */
#define DEFAULT_BUF_LEN (1024)
#define DEFAULT_TCP_BUF_LEN (1024 * 8)
#define DEFAULT_UDP_BUF_LEN (1024 * 128)
/* Default Ncat port */
#define DEFAULT_NCAT_PORT 31337
/* Default port for SOCKS4 */
#define DEFAULT_SOCKS4_PORT 1080
/* Default port for SOCKS5 */
#define DEFAULT_SOCKS5_PORT 1080
/* The default port Ncat will connect to when trying to connect to an HTTP
* proxy server. The current setting is the default for squid and probably
* other HTTP proxies. But it may also be 8080, 8888, etc.
*/
#define DEFAULT_PROXY_PORT 3128
/* Listen() backlog */
#define BACKLOG 10
/* The default maximum number of simultaneous connections Ncat will accept to
* a listening port. You may want to increase or decrease this value depending
* on your specific needs.
*/
#ifdef WIN32
/* Windows is commonly limited to 64 sockets, so keep the default somewhat below
that. http://www.tangentsoft.net/wskfaq/advanced.html#64sockets */
#define DEFAULT_MAX_CONNS 60
#else
#define DEFAULT_MAX_CONNS 100
#endif
/* SOCKS4 protocol responses */
#define SOCKS4_VERSION 4
#define SOCKS_CONNECT 1
#define SOCKS_BIND 2
#define SOCKS4_CONN_ACC 90 /* woot */
#define SOCKS4_CONN_REF 91
#define SOCKS4_CONN_IDENT 92
#define SOCKS4_CONN_IDENTDIFF 93
/* SOCKS5 protocol */
#define SOCKS5_VERSION 5
#define SOCKS5_AUTH_NONE 0
#define SOCKS5_AUTH_GSSAPI 1
#define SOCKS5_AUTH_USERPASS 2
#define SOCKS5_AUTH_FAILED 255
#define SOCKS5_ATYP_IPv4 1
#define SOCKS5_ATYP_NAME 3
#define SOCKS5_ATYP_IPv6 4
#define SOCKS5_USR_MAXLEN 255
#define SOCKS5_PWD_MAXLEN 255
#define SOCKS5_DST_MAXLEN 255
#if SOCKS_BUFF_SIZE < (1 + SOCKS5_USR_MAXLEN) + (1 + SOCKS5_PWD_MAXLEN)
#error SOCKS_BUFF_SIZE is defined too small to handle SOCKS5 authentication
#endif
#if SOCKS_BUFF_SIZE < (1 + SOCKS5_DST_MAXLEN) + 2
#error SOCKS_BUFF_SIZE is defined too small to handle SOCKS5 destination
#endif
/* Length of IPv6 address */
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 46
#endif
#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP 132
#endif
/* Dummy WNOHANG for Windows */
#ifndef WNOHANG
#define WNOHANG 0
#endif
#endif
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