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/p2ptransport.h"
29
30 #include <string>
31 #include <vector>
32
33 #include "talk/base/base64.h"
34 #include "talk/base/common.h"
35 #include "talk/base/stringencode.h"
36 #include "talk/base/stringutils.h"
37 #include "talk/p2p/base/constants.h"
38 #include "talk/p2p/base/p2ptransportchannel.h"
39 #include "talk/p2p/base/parsing.h"
40 #include "talk/p2p/base/sessionmanager.h"
41 #include "talk/p2p/base/sessionmessages.h"
42 #include "talk/xmllite/qname.h"
43 #include "talk/xmllite/xmlelement.h"
44 #include "talk/xmpp/constants.h"
45
46 namespace {
47
48 // We only allow usernames to be this many characters or fewer.
49 const size_t kMaxUsernameSize = 16;
50
51 } // namespace
52
53 namespace cricket {
54
P2PTransport(talk_base::Thread * signaling_thread,talk_base::Thread * worker_thread,PortAllocator * allocator)55 P2PTransport::P2PTransport(talk_base::Thread* signaling_thread,
56 talk_base::Thread* worker_thread,
57 PortAllocator* allocator)
58 : Transport(signaling_thread, worker_thread,
59 NS_GINGLE_P2P, allocator) {
60 }
61
~P2PTransport()62 P2PTransport::~P2PTransport() {
63 DestroyAllChannels();
64 }
65
OnTransportError(const buzz::XmlElement * error)66 void P2PTransport::OnTransportError(const buzz::XmlElement* error) {
67 // Need to know if it was <unknown-channel name="xxx">.
68 ASSERT(error->Name().Namespace() == type());
69 if ((error->Name() == QN_GINGLE_P2P_UNKNOWN_CHANNEL_NAME)
70 && error->HasAttr(buzz::QN_NAME)) {
71 std::string channel_name = error->Attr(buzz::QN_NAME);
72 if (HasChannel(channel_name)) {
73 SignalChannelGone(this, channel_name);
74 }
75 }
76 }
77
78
ParseCandidates(SignalingProtocol protocol,const buzz::XmlElement * elem,Candidates * candidates,ParseError * error)79 bool P2PTransportParser::ParseCandidates(SignalingProtocol protocol,
80 const buzz::XmlElement* elem,
81 Candidates* candidates,
82 ParseError* error) {
83 // TODO: Once we implement standard ICE-UDP, parse the
84 // candidates according to XEP-176.
85 for (const buzz::XmlElement* candidate_elem = elem->FirstElement();
86 candidate_elem != NULL;
87 candidate_elem = candidate_elem->NextElement()) {
88 // Only look at local part because it might be <session><candidate>
89 // or <tranport><candidate>.
90 if (candidate_elem->Name().LocalPart() == LN_CANDIDATE) {
91 Candidate candidate;
92 if (!ParseCandidate(candidate_elem, &candidate, error))
93 return false;
94 candidates->push_back(candidate);
95 }
96 }
97 return true;
98 }
99
ParseCandidate(const buzz::XmlElement * elem,Candidate * candidate,ParseError * error)100 bool P2PTransportParser::ParseCandidate(const buzz::XmlElement* elem,
101 Candidate* candidate,
102 ParseError* error) {
103 if (!elem->HasAttr(buzz::QN_NAME) ||
104 !elem->HasAttr(QN_ADDRESS) ||
105 !elem->HasAttr(QN_PORT) ||
106 !elem->HasAttr(QN_USERNAME) ||
107 !elem->HasAttr(QN_PREFERENCE) ||
108 !elem->HasAttr(QN_PROTOCOL) ||
109 !elem->HasAttr(QN_GENERATION)) {
110 return BadParse("candidate missing required attribute", error);
111 }
112
113 talk_base::SocketAddress address;
114 if (!ParseAddress(elem, QN_ADDRESS, QN_PORT, &address, error))
115 return false;
116
117 candidate->set_name(elem->Attr(buzz::QN_NAME));
118 candidate->set_address(address);
119 candidate->set_username(elem->Attr(QN_USERNAME));
120 candidate->set_preference_str(elem->Attr(QN_PREFERENCE));
121 candidate->set_protocol(elem->Attr(QN_PROTOCOL));
122 candidate->set_generation_str(elem->Attr(QN_GENERATION));
123 if (elem->HasAttr(QN_PASSWORD))
124 candidate->set_password(elem->Attr(QN_PASSWORD));
125 if (elem->HasAttr(buzz::QN_TYPE))
126 candidate->set_type(elem->Attr(buzz::QN_TYPE));
127 if (elem->HasAttr(QN_NETWORK))
128 candidate->set_network_name(elem->Attr(QN_NETWORK));
129
130 if (!VerifyUsernameFormat(candidate->username(), error))
131 return false;
132
133 return true;
134 }
135
VerifyUsernameFormat(const std::string & username,ParseError * error)136 bool P2PTransportParser::VerifyUsernameFormat(const std::string& username,
137 ParseError* error) {
138 if (username.size() > kMaxUsernameSize)
139 return BadParse("candidate username is too long", error);
140 if (!talk_base::Base64::IsBase64Encoded(username))
141 return BadParse(
142 "candidate username has non-base64 encoded characters", error);
143 return true;
144 }
145
GetCandidateQName(SignalingProtocol protocol)146 const buzz::QName& GetCandidateQName(SignalingProtocol protocol) {
147 if (protocol == PROTOCOL_GINGLE) {
148 return QN_GINGLE_CANDIDATE;
149 } else {
150 // TODO: Once we implement standard ICE-UDP, use the
151 // XEP-176 namespace.
152 return QN_GINGLE_P2P_CANDIDATE;
153 }
154 }
155
WriteCandidates(SignalingProtocol protocol,const Candidates & candidates,XmlElements * candidate_elems,WriteError * error)156 bool P2PTransportParser::WriteCandidates(SignalingProtocol protocol,
157 const Candidates& candidates,
158 XmlElements* candidate_elems,
159 WriteError* error) {
160 // TODO: Once we implement standard ICE-UDP, parse the
161 // candidates according to XEP-176.
162 for (std::vector<Candidate>::const_iterator iter = candidates.begin();
163 iter != candidates.end(); ++iter) {
164 buzz::XmlElement* cand_elem =
165 new buzz::XmlElement(GetCandidateQName(protocol));
166 if (!WriteCandidate(*iter, cand_elem, error))
167 return false;
168 candidate_elems->push_back(cand_elem);
169 }
170 return true;
171 }
172
WriteCandidate(const Candidate & candidate,buzz::XmlElement * elem,WriteError * error)173 bool P2PTransportParser::WriteCandidate(const Candidate& candidate,
174 buzz::XmlElement* elem,
175 WriteError* error) {
176 elem->SetAttr(buzz::QN_NAME, candidate.name());
177 elem->SetAttr(QN_ADDRESS, candidate.address().IPAsString());
178 elem->SetAttr(QN_PORT, candidate.address().PortAsString());
179 elem->SetAttr(QN_PREFERENCE, candidate.preference_str());
180 elem->SetAttr(QN_USERNAME, candidate.username());
181 elem->SetAttr(QN_PROTOCOL, candidate.protocol());
182 elem->SetAttr(QN_GENERATION, candidate.generation_str());
183 if (candidate.password().size() > 0)
184 elem->SetAttr(QN_PASSWORD, candidate.password());
185 if (candidate.type().size() > 0)
186 elem->SetAttr(buzz::QN_TYPE, candidate.type());
187 if (candidate.network_name().size() > 0)
188 elem->SetAttr(QN_NETWORK, candidate.network_name());
189 return true;
190 }
191
CreateTransportChannel(const std::string & name,const std::string & content_type)192 TransportChannelImpl* P2PTransport::CreateTransportChannel(
193 const std::string& name, const std::string& content_type) {
194 return new P2PTransportChannel(name, content_type, this, port_allocator());
195 }
196
DestroyTransportChannel(TransportChannelImpl * channel)197 void P2PTransport::DestroyTransportChannel(TransportChannelImpl* channel) {
198 delete channel;
199 }
200
201 } // namespace cricket
202