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      1 /*
      2  * libjingle
      3  * Copyright 2012 Google Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_P2P_BASE_TRANSPORTDESCRIPTIONFACTORY_H_
     29 #define TALK_P2P_BASE_TRANSPORTDESCRIPTIONFACTORY_H_
     30 
     31 #include "talk/p2p/base/transportdescription.h"
     32 
     33 namespace rtc {
     34 class SSLIdentity;
     35 }
     36 
     37 namespace cricket {
     38 
     39 struct TransportOptions {
     40   TransportOptions() : ice_restart(false), prefer_passive_role(false) {}
     41   bool ice_restart;
     42   bool prefer_passive_role;
     43 };
     44 
     45 // Creates transport descriptions according to the supplied configuration.
     46 // When creating answers, performs the appropriate negotiation
     47 // of the various fields to determine the proper result.
     48 class TransportDescriptionFactory {
     49  public:
     50   // Default ctor; use methods below to set configuration.
     51   TransportDescriptionFactory();
     52   SecurePolicy secure() const { return secure_; }
     53   // The identity to use when setting up DTLS.
     54   rtc::SSLIdentity* identity() const { return identity_; }
     55 
     56   // Specifies the transport protocol to be use.
     57   void set_protocol(TransportProtocol protocol) { protocol_ = protocol; }
     58   // Specifies the transport security policy to use.
     59   void set_secure(SecurePolicy s) { secure_ = s; }
     60   // Specifies the identity to use (only used when secure is not SEC_DISABLED).
     61   void set_identity(rtc::SSLIdentity* identity) { identity_ = identity; }
     62 
     63   // Creates a transport description suitable for use in an offer.
     64   TransportDescription* CreateOffer(const TransportOptions& options,
     65       const TransportDescription* current_description) const;
     66   // Create a transport description that is a response to an offer.
     67   TransportDescription* CreateAnswer(
     68       const TransportDescription* offer,
     69       const TransportOptions& options,
     70       const TransportDescription* current_description) const;
     71 
     72  private:
     73   bool SetSecurityInfo(TransportDescription* description,
     74                        ConnectionRole role) const;
     75 
     76   TransportProtocol protocol_;
     77   SecurePolicy secure_;
     78   rtc::SSLIdentity* identity_;
     79 };
     80 
     81 }  // namespace cricket
     82 
     83 #endif  // TALK_P2P_BASE_TRANSPORTDESCRIPTIONFACTORY_H_
     84