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Connection.h
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Connection.h
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/***************************************************************************
* Connection.h -- The "Connection" class holds information specifically *
* pertaining to connection probes. Objects of this class must always *
* belong to a certain "Service" object. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2021 Insecure.Com LLC ("The Nmap *
* Project"). Nmap is also a registered trademark of the Nmap Project. *
* This program is free software; you may redistribute and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE *
* CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your *
* right to use, modify, and redistribute this software under certain *
* conditions. If you wish to embed Nmap technology into proprietary *
* software, we sell alternative licenses (contact [email protected]). *
* Dozens of software vendors already license Nmap technology such as *
* host discovery, port scanning, OS detection, version detection, and *
* the Nmap Scripting Engine. *
* *
* Note that the GPL places important restrictions on "derivative works", *
* yet it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we interpret that term as broadly as copyright law *
* allows. For example, we consider an application to constitute a *
* derivative work for the purpose of this license if it does any of the *
* following with any software or content covered by this license *
* ("Covered Software"): *
* *
* o Integrates source code from Covered Software. *
* *
* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
* or nmap-service-probes. *
* *
* o Is designed specifically to execute Covered Software and parse the *
* results (as opposed to typical shell or execution-menu apps, which will *
* execute anything you tell them to). *
* *
* o Includes Covered Software in a proprietary executable installer. The *
* installers produced by InstallShield are an example of this. Including *
* Nmap with other software in compressed or archival form does not *
* trigger this provision, provided appropriate open source decompression *
* or de-archiving software is widely available for no charge. For the *
* purposes of this license, an installer is considered to include Covered *
* Software even if it actually retrieves a copy of Covered Software from *
* another source during runtime (such as by downloading it from the *
* Internet). *
* *
* o Links (statically or dynamically) to a library which does any of the *
* above. *
* *
* o Executes a helper program, module, or script to do any of the above. *
* *
* This list is not exclusive, but is meant to clarify our interpretation *
* of derived works with some common examples. Other people may interpret *
* the plain GPL differently, so we consider this a special exception to *
* the GPL that we apply to Covered Software. Works which meet any of *
* these conditions must conform to all of the terms of this license, *
* particularly including the GPL Section 3 requirements of providing *
* source code and allowing free redistribution of the work as a whole. *
* *
* As another special exception to the GPL terms, the Nmap Project grants *
* permission to link the code of this program with any version of the *
* OpenSSL library which is distributed under a license identical to that *
* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
* linked combinations including the two. *
* *
* The Nmap Project has permission to redistribute Npcap, a packet *
* capturing driver and library for the Microsoft Windows platform. *
* Npcap is a separate work with it's own license rather than this Nmap *
* license. Since the Npcap license does not permit redistribution *
* without special permission, our Nmap Windows binary packages which *
* contain Npcap may not be redistributed without special permission. *
* *
* Any redistribution of Covered Software, including any derived works, *
* must obey and carry forward all of the terms of this license, including *
* obeying all GPL rules and restrictions. For example, source code of *
* the whole work must be provided and free redistribution must be *
* allowed. All GPL references to "this License", are to be treated as *
* including the terms and conditions of this license text as well. *
* *
* Because this license imposes special exceptions to the GPL, Covered *
* Work may not be combined (even as part of a larger work) with plain GPL *
* software. The terms, conditions, and exceptions of this license must *
* be included as well. This license is incompatible with some other open *
* source licenses as well. In some cases we can relicense portions of *
* Nmap or grant special permissions to use it in other open source *
* software. Please contact [email protected] with any such requests. *
* Similarly, we don't incorporate incompatible open source software into *
* Covered Software without special permission from the copyright holders. *
* *
* If you have any questions about the licensing restrictions on using *
* Nmap in other works, we are happy to help. As mentioned above, we also *
* offer an alternative license to integrate Nmap into proprietary *
* applications and appliances. These contracts have been sold to dozens *
* of software vendors, and generally include a perpetual license as well *
* as providing support and updates. They also fund the continued *
* development of Nmap. Please email [email protected] for further *
* information. *
* *
* If you have received a written license agreement or contract for *
* Covered Software stating terms other than these, you may choose to use *
* and redistribute Covered Software under those terms instead of these. *
* *
* 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 send your changes *
* to the [email protected] mailing list for possible incorporation into the *
* main distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, or checking them into the Nmap *
* source code repository, it is understood (unless you specify *
* otherwise) that you are offering the Nmap Project the unlimited, *
* non-exclusive right to reuse, modify, and relicense the code. Nmap *
* will always be available Open Source, but this is important because *
* the inability to relicense code has caused devastating problems for *
* other Free Software projects (such as KDE and NASM). We also *
* occasionally relicense the code to third parties as discussed above. *
* If you wish to specify special license conditions of your *
* contributions, just say so when you send them. *
* *
* This program 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. See the Nmap *
* license file for more details (it's in a COPYING file included with *
* Nmap, and also available from https://svn.nmap.org/nmap/COPYING) *
* *
***************************************************************************/
class Service;
/*
* Active connection taking place for authenticating service.
* Each connection may try to authenticatate more than once before closing,
* depending on the service. For UDP 1 connection = 1 authentication session.
*/
class Connection
{
public:
Connection(Service *serv);
~Connection();
int time_started;
int time_elapsed;
char *user;
char *pass;
/*
* True when we peer might close connection at the near moment.
* Consider the case, when some services after reaching the maximum
* authentication limit per connecton, just drop the connection without
* specifically telling you that you failed at the last authentication
* attempt. Thus, we use this, to be able to count the correct number of
* maximum attempts the peer lets us do (stored in 'supported_attempts'
* inside the Service class). A module should probably set it to true
* after writing the password on the wire and before issuing the next
* read call. Also if you use it, don't forget to set it to false, in the
* first state of your module, because we might need it to differentiate
* between normal server FINs and FINs/RSTs sent in the middle of an
* authentication due to strange network conditions.
*/
bool peer_might_close;
/* True if we have received a server reply, that indicated that it didn't
* close the connection prematurely. This may used in cases, when the
* server may close the connection after the maximum allowed auth attempts
* are reached, but will also print a relative message saying we failed.
*/
bool finished_normally; /* XXX not currently used anywhere */
bool check_closed; /* true -> check if peer closed connection on us */
bool peer_alive; /* true -> if peer is certain to be alive currently */
bool auth_complete; /* true -> login pair tested */
bool from_pool; /* true -> login pair was extracted from pair_pool */
bool closed; /* true -> connection was closed */
bool auth_success; /* true -> we found a valid pair!!! */
bool force_close; /* true -> forcefully close the connection */
void *misc_info; /* additional state information that might be needed */
/* function pointer to module-specific free operation that deallocates
* all internal struct members of misc_info
*/
void (* ops_free)(Connection *);
int close_reason;
int state; /* module state-machine's current state */
Buf *inbuf; /* buffer for inbound data */
Buf *outbuf; /* buffer for outbound data */
unsigned long login_attempts; /* login attempts up until now */
nsock_iod niod; /* I/O descriptor for this connection */
/* This stores our SSL session id, which will help speed up subsequent
* SSL connections. It's overwritten each time. void* is used so we don't
* need to #ifdef HAVE_OPENSSL all over. We'll cast later as needed.
*/
void *ssl_session;
Service *service; /* service it belongs to */
};
enum close_reasons { READ_EOF, READ_TIMEOUT, CON_ERR, CON_TIMEOUT, MODULE_ERR };