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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, Google Inc.
      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 #include "talk/p2p/base/portallocator.h"
     29 
     30 #include "talk/p2p/base/portallocatorsessionproxy.h"
     31 
     32 namespace cricket {
     33 
     34 PortAllocatorSession::PortAllocatorSession(const std::string& content_name,
     35                                            int component,
     36                                            const std::string& ice_ufrag,
     37                                            const std::string& ice_pwd,
     38                                            uint32 flags)
     39     : content_name_(content_name),
     40       component_(component),
     41       flags_(flags),
     42       generation_(0),
     43       // If PORTALLOCATOR_ENABLE_SHARED_UFRAG flag is not enabled, ignore the
     44       // incoming ufrag and pwd, which will cause each Port to generate one
     45       // by itself.
     46       username_(flags_ & PORTALLOCATOR_ENABLE_SHARED_UFRAG ? ice_ufrag : ""),
     47       password_(flags_ & PORTALLOCATOR_ENABLE_SHARED_UFRAG ? ice_pwd : "") {
     48 }
     49 
     50 PortAllocator::~PortAllocator() {
     51   for (SessionMuxerMap::iterator iter = muxers_.begin();
     52        iter != muxers_.end(); ++iter) {
     53     delete iter->second;
     54   }
     55 }
     56 
     57 PortAllocatorSession* PortAllocator::CreateSession(
     58     const std::string& sid,
     59     const std::string& content_name,
     60     int component,
     61     const std::string& ice_ufrag,
     62     const std::string& ice_pwd) {
     63   if (flags_ & PORTALLOCATOR_ENABLE_BUNDLE) {
     64     // If we just use |sid| as key in identifying PortAllocatorSessionMuxer,
     65     // ICE restart will not result in different candidates, as |sid| will
     66     // be same. To yield different candiates we are using combination of
     67     // |ice_ufrag| and |ice_pwd|.
     68     // Ideally |ice_ufrag| and |ice_pwd| should change together, but
     69     // there can be instances where only ice_pwd will be changed.
     70     std::string key_str = ice_ufrag + ":" + ice_pwd;
     71     PortAllocatorSessionMuxer* muxer = GetSessionMuxer(key_str);
     72     if (!muxer) {
     73       PortAllocatorSession* session_impl = CreateSessionInternal(
     74           content_name, component, ice_ufrag, ice_pwd);
     75       // Create PortAllocatorSessionMuxer object for |session_impl|.
     76       muxer = new PortAllocatorSessionMuxer(session_impl);
     77       muxer->SignalDestroyed.connect(
     78           this, &PortAllocator::OnSessionMuxerDestroyed);
     79       // Add PortAllocatorSession to the map.
     80       muxers_[key_str] = muxer;
     81     }
     82     PortAllocatorSessionProxy* proxy =
     83         new PortAllocatorSessionProxy(content_name, component, flags_);
     84     muxer->RegisterSessionProxy(proxy);
     85     return proxy;
     86   }
     87   return CreateSessionInternal(content_name, component, ice_ufrag, ice_pwd);
     88 }
     89 
     90 PortAllocatorSessionMuxer* PortAllocator::GetSessionMuxer(
     91     const std::string& key) const {
     92   SessionMuxerMap::const_iterator iter = muxers_.find(key);
     93   if (iter != muxers_.end())
     94     return iter->second;
     95   return NULL;
     96 }
     97 
     98 void PortAllocator::OnSessionMuxerDestroyed(
     99     PortAllocatorSessionMuxer* session) {
    100   SessionMuxerMap::iterator iter;
    101   for (iter = muxers_.begin(); iter != muxers_.end(); ++iter) {
    102     if (iter->second == session)
    103       break;
    104   }
    105   if (iter != muxers_.end())
    106     muxers_.erase(iter);
    107 }
    108 
    109 }  // namespace cricket
    110