anyrtpproxy/portWindow.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 anytun.org <satp@wirdorange.org>
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2
  18  *  as published by the Free Software Foundation.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program (see the file COPYING included with this
  27  *  distribution); if not, write to the Free Software Foundation, Inc.,
  28  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  */
  30
  31 #include "portWindow.h"
  32
  33 PortWindow::PortWindow(u_int16_t start, u_int16_t end) : start_port_(start), end_port_(end)
  34 {
  35 }
  36
  37 PortWindow::~PortWindow()
  38 {
  39 }
  40
  41 PortWindow::PortSet::size_type PortWindow::getLength()
  42 {
  43   Lock lock(mutex_);
  44   return ports_.size();
  45 }
  46
  47 bool PortWindow::hasPort(u_int16_t port)
  48 {
  49   Lock lock(mutex_);
  50
  51   PortSet::const_iterator it=ports_.find(port);
  52   if(it == ports_.end())
  53     return false;
  54   return true;
  55 }
  56
  57 bool PortWindow::freePort(u_int16_t port)
  58 {
  59   Lock lock(mutex_);
  60
  61   PortSet::iterator it=ports_.find(port);
  62   if(it == ports_.end())
  63     return false;
  64         ports_.erase(it);
  65   return true;
  66 }
  67
  68 u_int16_t PortWindow::newPort()
  69 {
  70   Lock lock(mutex_);
  71         u_int16_t port= start_port_;
  72         while (port<end_port_ && ports_.find(port) !=ports_.end())
  73           port++;
  74   if (port>=end_port_)
  75                 return 0;
  76         ports_.insert(port);
  77         return port;
  78 }
  79
  80 void PortWindow::clear()
  81 {
  82   Lock lock(mutex_);
  83   ports_.clear();
  84 }
  85