src/seqWindow.cpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
  15  *                          Christian Pointner <satp@wirdorange.org>
  16  *
  17  *  This file is part of Anytun.
  18  *
  19  *  Anytun is free software: you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License version 3 as
  21  *  published by the Free Software Foundation.
  22  *
  23  *  Anytun is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 #include "threadUtils.hpp"
  33 #include "datatypes.h"
  34
  35 #include "seqWindow.h"
  36
  37 SeqWindow::SeqWindow(window_size_t w) : window_size_(w)
  38 {
  39 }
  40
  41 SeqWindow::~SeqWindow()
  42 {
  43 }
  44
  45 SeqWindow::SeqDeque::size_type SeqWindow::getLength(sender_id_t sender)
  46 {
  47   Lock lock(mutex_);
  48   SenderMap::const_iterator s = sender_.find(sender);
  49   if(s == sender_.end())
  50     return 0;
  51
  52   return s->second.size();
  53 }
  54
  55 bool SeqWindow::hasSeqNr(sender_id_t sender, seq_nr_t seq)
  56 {
  57   Lock lock(mutex_);
  58   if (!window_size_)
  59     return false;
  60   SenderMap::const_iterator s = sender_.find(sender);
  61   if(s == sender_.end())
  62     return false;
  63
  64   SeqDeque::const_iterator it;
  65   for(it = s->second.begin(); it != s->second.end(); it++)
  66     if(*it == seq)
  67       return true;
  68
  69   return false;
  70 }
  71
  72 void SeqWindow::addSeqNr(sender_id_t sender, seq_nr_t seq)
  73 {
  74   Lock lock(mutex_);
  75   if (!window_size_)
  76     return;
  77   if(sender_[sender].size() >= window_size_)
  78     sender_[sender].pop_front();
  79   sender_[sender].push_back(seq);
  80 }
  81
  82 void SeqWindow::clear(sender_id_t sender)
  83 {
  84   Lock lock(mutex_);
  85   sender_[sender].clear();
  86   sender_.erase(sender);
  87 }
  88
  89 void SeqWindow::clear()
  90 {
  91   Lock lock(mutex_);
  92   sender_.clear();
  93 }
  94