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/stunrequest.h"
29
30 #include "talk/base/common.h"
31 #include "talk/base/helpers.h"
32 #include "talk/base/logging.h"
33
34 namespace cricket {
35
36 const uint32 MSG_STUN_SEND = 1;
37
38 const int MAX_SENDS = 9;
39 const int DELAY_UNIT = 100; // 100 milliseconds
40 const int DELAY_MAX_FACTOR = 16;
41
StunRequestManager(talk_base::Thread * thread)42 StunRequestManager::StunRequestManager(talk_base::Thread* thread)
43 : thread_(thread) {
44 }
45
~StunRequestManager()46 StunRequestManager::~StunRequestManager() {
47 while (requests_.begin() != requests_.end()) {
48 StunRequest *request = requests_.begin()->second;
49 requests_.erase(requests_.begin());
50 delete request;
51 }
52 }
53
Send(StunRequest * request)54 void StunRequestManager::Send(StunRequest* request) {
55 SendDelayed(request, 0);
56 }
57
SendDelayed(StunRequest * request,int delay)58 void StunRequestManager::SendDelayed(StunRequest* request, int delay) {
59 request->set_manager(this);
60 ASSERT(requests_.find(request->id()) == requests_.end());
61 request->Construct();
62 requests_[request->id()] = request;
63 thread_->PostDelayed(delay, request, MSG_STUN_SEND, NULL);
64 }
65
Remove(StunRequest * request)66 void StunRequestManager::Remove(StunRequest* request) {
67 ASSERT(request->manager() == this);
68 RequestMap::iterator iter = requests_.find(request->id());
69 if (iter != requests_.end()) {
70 ASSERT(iter->second == request);
71 requests_.erase(iter);
72 thread_->Clear(request);
73 }
74 }
75
Clear()76 void StunRequestManager::Clear() {
77 std::vector<StunRequest*> requests;
78 for (RequestMap::iterator i = requests_.begin(); i != requests_.end(); ++i)
79 requests.push_back(i->second);
80
81 for (uint32 i = 0; i < requests.size(); ++i)
82 Remove(requests[i]);
83 }
84
CheckResponse(StunMessage * msg)85 bool StunRequestManager::CheckResponse(StunMessage* msg) {
86 RequestMap::iterator iter = requests_.find(msg->transaction_id());
87 if (iter == requests_.end())
88 return false;
89
90 StunRequest* request = iter->second;
91 if (msg->type() == GetStunResponseType(request->type())) {
92 request->OnResponse(msg);
93 } else if (msg->type() == GetStunErrorResponseType(request->type())) {
94 request->OnErrorResponse(msg);
95 } else {
96 LOG(LERROR) << "Received response with wrong type: " << msg->type()
97 << " (expecting " << GetStunResponseType(request->type()) << ")";
98 return false;
99 }
100
101 delete request;
102 return true;
103 }
104
CheckResponse(const char * data,size_t size)105 bool StunRequestManager::CheckResponse(const char* data, size_t size) {
106 // Check the appropriate bytes of the stream to see if they match the
107 // transaction ID of a response we are expecting.
108
109 if (size < 20)
110 return false;
111
112 std::string id;
113 id.append(data + 4, 16);
114
115 RequestMap::iterator iter = requests_.find(id);
116 if (iter == requests_.end())
117 return false;
118
119 // Parse the STUN message and continue processing as usual.
120
121 talk_base::ByteBuffer buf(data, size);
122 StunMessage msg;
123 if (!msg.Read(&buf))
124 return false;
125
126 return CheckResponse(&msg);
127 }
128
StunRequest()129 StunRequest::StunRequest()
130 : count_(0), timeout_(false), manager_(0),
131 id_(talk_base::CreateRandomString(16)), msg_(new StunMessage()),
132 tstamp_(0) {
133 msg_->SetTransactionID(id_);
134 }
135
StunRequest(StunMessage * request)136 StunRequest::StunRequest(StunMessage* request)
137 : count_(0), timeout_(false), manager_(0),
138 id_(request->transaction_id()), msg_(request) {
139 }
140
~StunRequest()141 StunRequest::~StunRequest() {
142 ASSERT(manager_ != NULL);
143 if (manager_) {
144 manager_->Remove(this);
145 manager_->thread_->Clear(this);
146 }
147 delete msg_;
148 }
149
Construct()150 void StunRequest::Construct() {
151 if (msg_->type() == 0) {
152 Prepare(msg_);
153 ASSERT(msg_->transaction_id() == id_);
154 ASSERT(msg_->type() != 0);
155 }
156 }
157
type()158 StunMessageType StunRequest::type() {
159 ASSERT(msg_ != NULL);
160 return msg_->type();
161 }
162
set_manager(StunRequestManager * manager)163 void StunRequest::set_manager(StunRequestManager* manager) {
164 ASSERT(!manager_);
165 manager_ = manager;
166 }
167
OnMessage(talk_base::Message * pmsg)168 void StunRequest::OnMessage(talk_base::Message* pmsg) {
169 ASSERT(manager_ != NULL);
170 ASSERT(pmsg->message_id == MSG_STUN_SEND);
171
172 if (timeout_) {
173 OnTimeout();
174 delete this;
175 return;
176 }
177
178 tstamp_ = talk_base::Time();
179
180 talk_base::ByteBuffer buf;
181 msg_->Write(&buf);
182 manager_->SignalSendPacket(buf.Data(), buf.Length(), this);
183
184 int delay = GetNextDelay();
185 manager_->thread_->PostDelayed(delay, this, MSG_STUN_SEND, NULL);
186 }
187
Elapsed() const188 uint32 StunRequest::Elapsed() const {
189 return talk_base::TimeSince(tstamp_);
190 }
191
GetNextDelay()192 int StunRequest::GetNextDelay() {
193 int delay = DELAY_UNIT * talk_base::_min(1 << count_, DELAY_MAX_FACTOR);
194 count_ += 1;
195 if (count_ == MAX_SENDS)
196 timeout_ = true;
197 return delay;
198 }
199
200 } // namespace cricket
201