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https://github.com/kasmtech/KasmVNC.git
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92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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//
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// Blacklist.h - Handling of black-listed entities.
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// Just keeps a table mapping strings to timing information, including
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// how many times the entry has been black-listed and when to next
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// put it on probation (e.g. allow a connection in from the host, and
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// re-blacklist it if that fails).
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//
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#ifndef __RFB_BLACKLIST_H__
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#define __RFB_BLACKLIST_H__
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#include <string.h>
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#include <time.h>
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#include <map>
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#include <rfb/Configuration.h>
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#include <rfb/util.h>
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namespace rfb {
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//
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// -=- Blacklist handler
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//
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// Parameters include a threshold after which to blacklist the named
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// host, and a timeout after which to re-consider them.
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//
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// Threshold means that isBlackmarked can be called that number of times
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// before it will return true.
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//
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// Timeout means that after that many seconds, the next call to isBlackmarked
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// will return false. At the same time, the timeout is doubled, so that the
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// next calls will fail, until the timeout expires again or clearBlackmark is
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// called.
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//
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// When clearBlackMark is called, the corresponding entry is completely
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// removed, causing the next isBlackmarked call to return false.
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// KNOWN BUG: Client can keep making rejected requests, thus increasing
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// their timeout. If client does this for 30 years, timeout may wrap round
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// to a very small value again.
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// THIS CLASS IS NOT THREAD-SAFE!
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class Blacklist {
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public:
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Blacklist();
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~Blacklist();
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bool isBlackmarked(const char* name);
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void clearBlackmark(const char* name);
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static IntParameter threshold;
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static IntParameter initialTimeout;
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protected:
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struct ltStr {
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bool operator()(const char* s1, const char* s2) const {
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return strcmp(s1, s2) < 0;
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};
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};
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struct BlacklistInfo {
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int marks;
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time_t blockUntil;
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unsigned int blockTimeout;
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};
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typedef std::map<const char*,BlacklistInfo,ltStr> BlacklistMap;
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BlacklistMap blm;
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};
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}
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#endif
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