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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) 1996-2011 Insecure.Com LLC. Nmap is *
* also a registered trademark of Insecure.Com LLC. 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 with the clarifications and exceptions described *
* below. 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, and version detection. *
* *
* Note that the GPL places important restrictions on "derived works", yet *
* it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we consider an application to constitute a *
* "derivative work" for the purpose of this license if it does any of the *
* following: *
* o Integrates source code from Nmap *
* o Reads or includes Nmap copyrighted data files, such as *
* nmap-os-db or nmap-service-probes. *
* o Executes Nmap and parses the results (as opposed to typical shell or *
* execution-menu apps, which simply display raw Nmap output and so are *
* not derivative works.) *
* o Integrates/includes/aggregates Nmap into a proprietary executable *
* installer, such as those produced by InstallShield. *
* o Links to a library or executes a program that does any of the above *
* *
* The term "Nmap" should be taken to also include any portions or derived *
* works of Nmap. This list is not exclusive, but is meant to clarify our *
* interpretation of derived works with some common examples. Our *
* interpretation applies only to Nmap--we don't speak for other people's *
* GPL works. *
* *
* If you have any questions about the GPL licensing restrictions on using *
* Nmap in non-GPL works, we would be happy to help. As mentioned above, *
* we also offer 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 for priority support and updates as well as helping to *
* fund the continued development of Nmap technology. Please email *
* [email protected] for further information. *
* *
* As a special exception to the GPL terms, Insecure.Com LLC 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. You must obey the GNU GPL in all *
* respects for all of the code used other than OpenSSL. If you modify *
* this file, you may extend this exception to your version of the file, *
* but you are not obligated to do so. *
* *
* If you received these files with a written license agreement or *
* contract stating terms other than the terms above, then that *
* alternative license agreement takes precedence over these comments. *
* *
* 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 (none *
* have been found so far). *
* *
* 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 [email protected] for possible incorporation into the main *
* distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, it is assumed that you are *
* offering the Nmap Project (Insecure.Com LLC) 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 GNU *
* General Public License v2.0 for more details at *
* http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file *
* included with Nmap. *
* *
***************************************************************************/
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 };