1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* Copyright 2013 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "p2p/base/transport_description.h"
#include <cstddef>
#include <optional>
#include <string>
#include <vector>
#include "absl/algorithm/container.h"
#include "absl/strings/ascii.h"
#include "absl/strings/match.h"
#include "absl/strings/string_view.h"
#include "api/rtc_error.h"
#include "p2p/base/p2p_constants.h"
#include "rtc_base/logging.h"
#include "rtc_base/ssl_fingerprint.h"
#include "rtc_base/strings/string_builder.h"
using webrtc::RTCError;
using webrtc::RTCErrorOr;
using webrtc::RTCErrorType;
namespace webrtc {
namespace {
bool IsIceChar(char c) {
// Note: '-', '=', '#' and '_' are *not* valid ice-chars but temporarily
// permitted in order to allow external software to upgrade.
if (c == '-' || c == '=' || c == '#' || c == '_') {
RTC_LOG(LS_WARNING)
<< "'-', '=', '#' and '-' are not valid ice-char and thus not "
<< "permitted in ufrag or pwd. This is a protocol violation that "
<< "is permitted to allow upgrading but will be rejected in "
<< "the future. See https://crbug.com/1053756";
return true;
}
return absl::ascii_isalnum(c) || c == '+' || c == '/';
}
RTCError ValidateIceUfrag(absl::string_view raw_ufrag) {
if (!(ICE_UFRAG_MIN_LENGTH <= raw_ufrag.size() &&
raw_ufrag.size() <= ICE_UFRAG_MAX_LENGTH)) {
StringBuilder sb;
sb << "ICE ufrag must be between " << ICE_UFRAG_MIN_LENGTH << " and "
<< ICE_UFRAG_MAX_LENGTH << " characters long.";
return RTCError(RTCErrorType::SYNTAX_ERROR, sb.Release());
}
if (!absl::c_all_of(raw_ufrag, IsIceChar)) {
return RTCError(
RTCErrorType::SYNTAX_ERROR,
"ICE ufrag must contain only alphanumeric characters, '+', and '/'.");
}
return RTCError::OK();
}
RTCError ValidateIcePwd(absl::string_view raw_pwd) {
if (!(ICE_PWD_MIN_LENGTH <= raw_pwd.size() &&
raw_pwd.size() <= ICE_PWD_MAX_LENGTH)) {
StringBuilder sb;
sb << "ICE pwd must be between " << ICE_PWD_MIN_LENGTH << " and "
<< ICE_PWD_MAX_LENGTH << " characters long.";
return RTCError(RTCErrorType::SYNTAX_ERROR, sb.Release());
}
if (!absl::c_all_of(raw_pwd, IsIceChar)) {
return RTCError(
RTCErrorType::SYNTAX_ERROR,
"ICE pwd must contain only alphanumeric characters, '+', and '/'.");
}
return RTCError::OK();
}
} // namespace
RTCErrorOr<IceParameters> IceParameters::Parse(absl::string_view raw_ufrag,
absl::string_view raw_pwd) {
IceParameters parameters(std::string(raw_ufrag), std::string(raw_pwd),
/* renomination= */ false);
auto result = parameters.Validate();
if (!result.ok()) {
return result;
}
return parameters;
}
RTCError IceParameters::Validate() const {
// For legacy protocols.
// TODO(zhihuang): Remove this once the legacy protocol is no longer
// supported.
if (ufrag.empty() && pwd.empty()) {
return RTCError::OK();
}
auto ufrag_result = ValidateIceUfrag(ufrag);
if (!ufrag_result.ok()) {
return ufrag_result;
}
auto pwd_result = ValidateIcePwd(pwd);
if (!pwd_result.ok()) {
return pwd_result;
}
return RTCError::OK();
}
std::optional<ConnectionRole> StringToConnectionRole(
absl::string_view role_str) {
const char* const roles[] = {
CONNECTIONROLE_ACTIVE_STR, CONNECTIONROLE_PASSIVE_STR,
CONNECTIONROLE_ACTPASS_STR, CONNECTIONROLE_HOLDCONN_STR};
for (size_t i = 0; i < std::size(roles); ++i) {
if (absl::EqualsIgnoreCase(roles[i], role_str)) {
return static_cast<ConnectionRole>(CONNECTIONROLE_ACTIVE + i);
}
}
return std::nullopt;
}
bool ConnectionRoleToString(const ConnectionRole& role, std::string* role_str) {
switch (role) {
case CONNECTIONROLE_ACTIVE:
*role_str = CONNECTIONROLE_ACTIVE_STR;
break;
case CONNECTIONROLE_ACTPASS:
*role_str = CONNECTIONROLE_ACTPASS_STR;
break;
case CONNECTIONROLE_PASSIVE:
*role_str = CONNECTIONROLE_PASSIVE_STR;
break;
case CONNECTIONROLE_HOLDCONN:
*role_str = CONNECTIONROLE_HOLDCONN_STR;
break;
default:
return false;
}
return true;
}
TransportDescription::TransportDescription()
: ice_mode(ICEMODE_FULL), connection_role(CONNECTIONROLE_NONE) {}
TransportDescription::TransportDescription(
const std::vector<std::string>& transport_options,
absl::string_view ice_ufrag,
absl::string_view ice_pwd,
IceMode ice_mode,
ConnectionRole role,
const SSLFingerprint* identity_fingerprint)
: transport_options(transport_options),
ice_ufrag(ice_ufrag),
ice_pwd(ice_pwd),
ice_mode(ice_mode),
connection_role(role),
identity_fingerprint(CopyFingerprint(identity_fingerprint)) {}
TransportDescription::TransportDescription(absl::string_view ice_ufrag,
absl::string_view ice_pwd)
: ice_ufrag(ice_ufrag),
ice_pwd(ice_pwd),
ice_mode(ICEMODE_FULL),
connection_role(CONNECTIONROLE_NONE) {}
TransportDescription::TransportDescription(const TransportDescription& from)
: transport_options(from.transport_options),
ice_ufrag(from.ice_ufrag),
ice_pwd(from.ice_pwd),
ice_mode(from.ice_mode),
connection_role(from.connection_role),
identity_fingerprint(CopyFingerprint(from.identity_fingerprint.get())) {}
TransportDescription::~TransportDescription() = default;
TransportDescription& TransportDescription::operator=(
const TransportDescription& from) {
// Self-assignment
if (this == &from)
return *this;
transport_options = from.transport_options;
ice_ufrag = from.ice_ufrag;
ice_pwd = from.ice_pwd;
ice_mode = from.ice_mode;
connection_role = from.connection_role;
identity_fingerprint.reset(CopyFingerprint(from.identity_fingerprint.get()));
return *this;
}
} // namespace webrtc
|
