/*************************************************************************** * ncat.h * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2022 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 #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 "7.93" #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