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1 /* | 1 /* |
2 * Copyright 2012 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2012 The WebRTC Project Authors. All rights reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #include "webrtc/p2p/base/transportdescriptionfactory.h" | 11 #include "webrtc/p2p/base/transportdescriptionfactory.h" |
12 | 12 |
13 #include "webrtc/p2p/base/transportdescription.h" | 13 #include "webrtc/p2p/base/transportdescription.h" |
14 #include "webrtc/base/helpers.h" | 14 #include "webrtc/base/helpers.h" |
15 #include "webrtc/base/logging.h" | 15 #include "webrtc/base/logging.h" |
16 #include "webrtc/base/messagedigest.h" | 16 #include "webrtc/base/messagedigest.h" |
17 #include "webrtc/base/scoped_ptr.h" | 17 #include "webrtc/base/scoped_ptr.h" |
18 #include "webrtc/base/sslfingerprint.h" | 18 #include "webrtc/base/sslfingerprint.h" |
19 | 19 |
20 namespace cricket { | 20 namespace cricket { |
21 | 21 |
| 22 static TransportProtocol kDefaultProtocol = ICEPROTO_RFC5245; |
| 23 |
22 TransportDescriptionFactory::TransportDescriptionFactory() | 24 TransportDescriptionFactory::TransportDescriptionFactory() |
23 : secure_(SEC_DISABLED) { | 25 : protocol_(kDefaultProtocol), |
| 26 secure_(SEC_DISABLED) { |
24 } | 27 } |
25 | 28 |
26 TransportDescription* TransportDescriptionFactory::CreateOffer( | 29 TransportDescription* TransportDescriptionFactory::CreateOffer( |
27 const TransportOptions& options, | 30 const TransportOptions& options, |
28 const TransportDescription* current_description) const { | 31 const TransportDescription* current_description) const { |
29 rtc::scoped_ptr<TransportDescription> desc(new TransportDescription()); | 32 rtc::scoped_ptr<TransportDescription> desc(new TransportDescription()); |
30 | 33 |
| 34 // Set the transport type depending on the selected protocol. |
| 35 if (protocol_ == ICEPROTO_RFC5245) { |
| 36 desc->transport_type = NS_JINGLE_ICE_UDP; |
| 37 } else if (protocol_ == ICEPROTO_HYBRID) { |
| 38 desc->transport_type = NS_JINGLE_ICE_UDP; |
| 39 desc->AddOption(ICE_OPTION_GICE); |
| 40 } else if (protocol_ == ICEPROTO_GOOGLE) { |
| 41 desc->transport_type = NS_GINGLE_P2P; |
| 42 } |
| 43 |
31 // Generate the ICE credentials if we don't already have them. | 44 // Generate the ICE credentials if we don't already have them. |
32 if (!current_description || options.ice_restart) { | 45 if (!current_description || options.ice_restart) { |
33 desc->ice_ufrag = rtc::CreateRandomString(ICE_UFRAG_LENGTH); | 46 desc->ice_ufrag = rtc::CreateRandomString(ICE_UFRAG_LENGTH); |
34 desc->ice_pwd = rtc::CreateRandomString(ICE_PWD_LENGTH); | 47 desc->ice_pwd = rtc::CreateRandomString(ICE_PWD_LENGTH); |
35 } else { | 48 } else { |
36 desc->ice_ufrag = current_description->ice_ufrag; | 49 desc->ice_ufrag = current_description->ice_ufrag; |
37 desc->ice_pwd = current_description->ice_pwd; | 50 desc->ice_pwd = current_description->ice_pwd; |
38 } | 51 } |
39 | 52 |
40 // If we are trying to establish a secure transport, add a fingerprint. | 53 // If we are trying to establish a secure transport, add a fingerprint. |
41 if (secure_ == SEC_ENABLED || secure_ == SEC_REQUIRED) { | 54 if (secure_ == SEC_ENABLED || secure_ == SEC_REQUIRED) { |
42 // Fail if we can't create the fingerprint. | 55 // Fail if we can't create the fingerprint. |
43 // If we are the initiator set role to "actpass". | 56 // If we are the initiator set role to "actpass". |
44 if (!SetSecurityInfo(desc.get(), CONNECTIONROLE_ACTPASS)) { | 57 if (!SetSecurityInfo(desc.get(), CONNECTIONROLE_ACTPASS)) { |
45 return NULL; | 58 return NULL; |
46 } | 59 } |
47 } | 60 } |
48 | 61 |
49 return desc.release(); | 62 return desc.release(); |
50 } | 63 } |
51 | 64 |
52 TransportDescription* TransportDescriptionFactory::CreateAnswer( | 65 TransportDescription* TransportDescriptionFactory::CreateAnswer( |
53 const TransportDescription* offer, | 66 const TransportDescription* offer, |
54 const TransportOptions& options, | 67 const TransportOptions& options, |
55 const TransportDescription* current_description) const { | 68 const TransportDescription* current_description) const { |
| 69 // A NULL offer is treated as a GICE transport description. |
56 // TODO(juberti): Figure out why we get NULL offers, and fix this upstream. | 70 // TODO(juberti): Figure out why we get NULL offers, and fix this upstream. |
57 if (!offer) { | 71 rtc::scoped_ptr<TransportDescription> desc(new TransportDescription()); |
58 LOG(LS_WARNING) << "Failed to create TransportDescription answer " << | 72 |
59 "because offer is NULL"; | 73 // Figure out which ICE variant to negotiate; prefer RFC 5245 ICE, but fall |
| 74 // back to G-ICE if needed. Note that we never create a hybrid answer, since |
| 75 // we know what the other side can support already. |
| 76 if (offer && offer->transport_type == NS_JINGLE_ICE_UDP && |
| 77 (protocol_ == ICEPROTO_RFC5245 || protocol_ == ICEPROTO_HYBRID)) { |
| 78 // Offer is ICE or hybrid, we support ICE or hybrid: use ICE. |
| 79 desc->transport_type = NS_JINGLE_ICE_UDP; |
| 80 } else if (offer && offer->transport_type == NS_JINGLE_ICE_UDP && |
| 81 offer->HasOption(ICE_OPTION_GICE) && |
| 82 protocol_ == ICEPROTO_GOOGLE) { |
| 83 desc->transport_type = NS_GINGLE_P2P; |
| 84 // Offer is hybrid, we support GICE: use GICE. |
| 85 } else if ((!offer || offer->transport_type == NS_GINGLE_P2P) && |
| 86 (protocol_ == ICEPROTO_HYBRID || protocol_ == ICEPROTO_GOOGLE)) { |
| 87 // Offer is GICE, we support hybrid or GICE: use GICE. |
| 88 desc->transport_type = NS_GINGLE_P2P; |
| 89 } else { |
| 90 // Mismatch. |
| 91 LOG(LS_WARNING) << "Failed to create TransportDescription answer " |
| 92 "because of incompatible transport types"; |
60 return NULL; | 93 return NULL; |
61 } | 94 } |
62 | 95 |
63 rtc::scoped_ptr<TransportDescription> desc(new TransportDescription()); | |
64 // Generate the ICE credentials if we don't already have them or ice is | 96 // Generate the ICE credentials if we don't already have them or ice is |
65 // being restarted. | 97 // being restarted. |
66 if (!current_description || options.ice_restart) { | 98 if (!current_description || options.ice_restart) { |
67 desc->ice_ufrag = rtc::CreateRandomString(ICE_UFRAG_LENGTH); | 99 desc->ice_ufrag = rtc::CreateRandomString(ICE_UFRAG_LENGTH); |
68 desc->ice_pwd = rtc::CreateRandomString(ICE_PWD_LENGTH); | 100 desc->ice_pwd = rtc::CreateRandomString(ICE_PWD_LENGTH); |
69 } else { | 101 } else { |
70 desc->ice_ufrag = current_description->ice_ufrag; | 102 desc->ice_ufrag = current_description->ice_ufrag; |
71 desc->ice_pwd = current_description->ice_pwd; | 103 desc->ice_pwd = current_description->ice_pwd; |
72 } | 104 } |
73 | 105 |
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118 << digest_alg; | 150 << digest_alg; |
119 return false; | 151 return false; |
120 } | 152 } |
121 | 153 |
122 // Assign security role. | 154 // Assign security role. |
123 desc->connection_role = role; | 155 desc->connection_role = role; |
124 return true; | 156 return true; |
125 } | 157 } |
126 | 158 |
127 } // namespace cricket | 159 } // namespace cricket |
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