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* Copyright 2004--2005, Google Inc.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "talk/base/nattypes.h"
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class SymmetricNAT : public NAT {
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bool IsSymmetric() { return true; }
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bool FiltersIP() { return true; }
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bool FiltersPort() { return true; }
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class OpenConeNAT : public NAT {
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bool IsSymmetric() { return false; }
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bool FiltersIP() { return false; }
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bool FiltersPort() { return false; }
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class AddressRestrictedNAT : public NAT {
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bool IsSymmetric() { return false; }
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bool FiltersIP() { return true; }
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bool FiltersPort() { return false; }
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class PortRestrictedNAT : public NAT {
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bool IsSymmetric() { return false; }
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bool FiltersIP() { return true; }
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bool FiltersPort() { return true; }
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NAT* NAT::Create(NATType type) {
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case NAT_OPEN_CONE: return new OpenConeNAT();
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case NAT_ADDR_RESTRICTED: return new AddressRestrictedNAT();
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case NAT_PORT_RESTRICTED: return new PortRestrictedNAT();
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case NAT_SYMMETRIC: return new SymmetricNAT();
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default: assert(0); return 0;
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} // namespace talk_base