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/***************************************************************************
* EchoClient.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/
*
***************************************************************************/
#ifndef __ECHOCLIENT_H__
#define __ECHOCLIENT_H__ 1
#include "nping.h"
#include "NpingTarget.h"
#include "NEPContext.h"
#include "ProbeMode.h"
#define ECHO_CONNECT_TIMEOUT (10*1000) /* 10 Seconds */
#define ECHO_READ_TIMEOUT (10*1000)
#define ECHO_WRITE_TIMEOUT (10*1000)
/* Max number of bytes that are supplied as data for the PAYLOAD_MAGIC specifier */
#define NEP_PAYLOADMAGIC_MAX_BYTES 8
class EchoClient {
private:
/* Attributes */
nsock_pool nsp; /**< Nsock pool (shared with ProbeMode) */
nsock_iod nsi; /**< IOD for the side-channel tcp socket*/
struct sockaddr_in srvaddr4; /**< Server's IPv4 address */
struct sockaddr_in6 srvaddr6; /**< Server's IPv6 address */
int af; /**< Address family (AF_INET or AF_INET6)*/
NEPContext ctx;
ProbeMode probe;
u8 lasthdr[MAX_NEP_PACKET_LENGTH];
size_t readbytes;
/* Methods */
int nep_connect(NpingTarget *target, u16 port);
int nep_handshake();
int nep_send_packet_spec();
int nep_recv_ready();
int nep_recv_echo(u8 *packet, size_t packetlen);
int parse_hs_server(u8 *pkt, size_t pktlen);
int parse_hs_final(u8 *pkt, size_t pktlen);
int parse_ready(u8 *pkt, size_t pktlen);
int parse_echo(u8 *pkt, size_t pktlen);
int parse_error(u8 *pkt, size_t pktlen);
int generate_hs_client(EchoHeader *h);
int generate_packet_spec(EchoHeader *h);
public:
EchoClient();
~EchoClient();
void reset();
int start(NpingTarget *target, u16 port);
int cleanup();
int nep_echoed_packet_handler(nsock_pool nsp, nsock_event nse, void *arg);
int nep_recv_std_header_handler(nsock_pool nsp, nsock_event nse, void *arg);
int nep_recv_hs_server_handler(nsock_pool nsp, nsock_event nse, void *arg);
int nep_recv_hs_final_handler(nsock_pool nsp, nsock_event nse, void *arg);
int nep_recv_ready_handler(nsock_pool nsp, nsock_event nse, void *arg);
}; /* End of class EchoClient */
/* Handler wrappers */
void echoed_packet_handler(nsock_pool nsp, nsock_event nse, void *arg);
void recv_std_header_handler(nsock_pool nsp, nsock_event nse, void *arg);
void connect_done_handler(nsock_pool nsp, nsock_event nse, void *arg);
void write_done_handler(nsock_pool nsp, nsock_event nse, void *arg);
void recv_hs_server_handler(nsock_pool nsp, nsock_event nse, void *arg);
void recv_hs_final_handler(nsock_pool nsp, nsock_event nse, void *arg);
void recv_ready_handler(nsock_pool nsp, nsock_event nse, void *arg);
#endif /* __ECHOCLIENT_H__ */
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