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/***************************************************************************
* EchoServer.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 __ECHOSERVER_H__
#define __ECHOSERVER_H__ 1
#include "nping.h"
#include "nsock.h"
#include <vector>
#include "NEPContext.h"
#define LISTEN_QUEUE_SIZE 10
class EchoServer {
private:
/* Attributes */
std::vector<NEPContext> client_ctx;
clientid_t client_id_count;
/* Methods */
int nep_listen_socket();
int addClientContext(NEPContext ctx);
NEPContext *getClientContext(clientid_t clnt);
NEPContext *getClientContext(nsock_iod iod);
int destroyClientContext(clientid_t clnt);
nsock_iod getClientNsockIOD(clientid_t clnt);
clientid_t getNewClientID();
clientid_t nep_match_packet(const u8 *pkt, size_t pktlen);
clientid_t nep_match_headers(IPv4Header *ip4, IPv6Header *ip6, TCPHeader *tcp, UDPHeader *udp, ICMPv4Header *icmp4, RawData *payload);
int parse_hs_client(u8 *pkt, size_t pktlen, NEPContext *ctx);
int parse_packet_spec(u8 *pkt, size_t pktlen, NEPContext *ctx);
int generate_hs_server(EchoHeader *h, NEPContext *ctx);
int generate_hs_final(EchoHeader *h, NEPContext *ctx);
int generate_ready(EchoHeader *h, NEPContext *ctx);
int generate_echo(EchoHeader *h, const u8 *pkt, size_t pktlen, NEPContext *ctx);
public:
EchoServer();
~EchoServer();
void reset();
int start();
int cleanup();
int nep_capture_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_echo_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_hs_server_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_hs_client_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_hs_final_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_packetspec_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_ready_handler(nsock_pool nsp, nsock_event nse, void *param);
int nep_session_ended_handler(nsock_pool nsp, nsock_event nse, void *param);
}; /* End of class EchoServer */
typedef struct handler_arg{
EchoServer *me;
void *param;
} handler_arg_t;
/* Handler wrappers */
void capture_handler(nsock_pool nsp, nsock_event nse, void *arg);
void echo_handler(nsock_pool nsp, nsock_event nse, void *arg);
void hs_server_handler(nsock_pool nsp, nsock_event nse, void *arg);
void hs_client_handler(nsock_pool nsp, nsock_event nse, void *arg);
void hs_final_handler(nsock_pool nsp, nsock_event nse, void *arg);
void packetspec_handler(nsock_pool nsp, nsock_event nse, void *arg);
void ready_handler(nsock_pool nsp, nsock_event nse, void *arg);
void empty_handler(nsock_pool nsp, nsock_event nse, void *arg);
void session_ended_handler(nsock_pool nsp, nsock_event nse, void *arg);
#endif /* __ECHOSERVER_H__ */
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