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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/proxy_string_util.h"
#include <string>
#include "base/notreached.h"
#include "base/strings/strcat.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "net/base/proxy_server.h"
#include "net/base/url_util.h"
#include "net/http/http_util.h"
#include "url/third_party/mozilla/url_parse.h"
namespace net {
namespace {
// Parses the proxy type from a PAC string, to a ProxyServer::Scheme.
// This mapping is case-insensitive. If no type could be matched
// returns SCHEME_INVALID.
ProxyServer::Scheme GetSchemeFromPacTypeInternal(base::StringPiece type) {
if (base::EqualsCaseInsensitiveASCII(type, "proxy"))
return ProxyServer::SCHEME_HTTP;
if (base::EqualsCaseInsensitiveASCII(type, "socks")) {
// Default to v4 for compatibility. This is because the SOCKS4 vs SOCKS5
// notation didn't originally exist, so if a client returns SOCKS they
// really meant SOCKS4.
return ProxyServer::SCHEME_SOCKS4;
}
if (base::EqualsCaseInsensitiveASCII(type, "socks4"))
return ProxyServer::SCHEME_SOCKS4;
if (base::EqualsCaseInsensitiveASCII(type, "socks5"))
return ProxyServer::SCHEME_SOCKS5;
if (base::EqualsCaseInsensitiveASCII(type, "direct"))
return ProxyServer::SCHEME_DIRECT;
if (base::EqualsCaseInsensitiveASCII(type, "https"))
return ProxyServer::SCHEME_HTTPS;
if (base::EqualsCaseInsensitiveASCII(type, "quic"))
return ProxyServer::SCHEME_QUIC;
return ProxyServer::SCHEME_INVALID;
}
ProxyServer FromSchemeHostAndPort(ProxyServer::Scheme scheme,
base::StringPiece host_and_port) {
// Trim leading/trailing space.
host_and_port = HttpUtil::TrimLWS(host_and_port);
if (scheme == ProxyServer::SCHEME_INVALID)
return ProxyServer();
if (scheme == ProxyServer::SCHEME_DIRECT) {
if (!host_and_port.empty())
return ProxyServer(); // Invalid -- DIRECT cannot have a host/port.
return ProxyServer::Direct();
}
url::Component username_component;
url::Component password_component;
url::Component hostname_component;
url::Component port_component;
url::ParseAuthority(host_and_port.data(),
url::Component(0, host_and_port.size()),
&username_component, &password_component,
&hostname_component, &port_component);
if (username_component.is_valid() || password_component.is_valid() ||
hostname_component.is_empty()) {
return ProxyServer();
}
base::StringPiece hostname =
host_and_port.substr(hostname_component.begin, hostname_component.len);
// Reject inputs like "foo:". /url parsing and canonicalization code generally
// allows it and treats it the same as a URL without a specified port, but
// Chrome has traditionally disallowed it in proxy specifications.
if (port_component.is_valid() && port_component.is_empty())
return ProxyServer();
base::StringPiece port =
port_component.is_nonempty()
? host_and_port.substr(port_component.begin, port_component.len)
: "";
return ProxyServer::FromSchemeHostAndPort(scheme, hostname, port);
}
std::string ConstructHostPortString(base::StringPiece hostname, uint16_t port) {
DCHECK(!hostname.empty());
DCHECK((hostname.front() == '[' && hostname.back() == ']') ||
hostname.find(":") == base::StringPiece::npos);
return base::StrCat({hostname, ":", base::NumberToString(port)});
}
} // namespace
ProxyChain PacResultElementToProxyChain(base::StringPiece pac_result_element) {
// TODO(https://crbug.com/1491092): Support parsing multi-hop proxy chains
// from PAC scripts.
return ProxyChain(PacResultElementToProxyServer(pac_result_element));
}
ProxyServer PacResultElementToProxyServer(
base::StringPiece pac_result_element) {
// Trim the leading/trailing whitespace.
pac_result_element = HttpUtil::TrimLWS(pac_result_element);
// Input should match:
// "DIRECT" | ( <type> 1*(LWS) <host-and-port> )
// Start by finding the first space (if any).
size_t space = 0;
for (; space < pac_result_element.size(); space++) {
if (HttpUtil::IsLWS(pac_result_element[space])) {
break;
}
}
// Everything to the left of the space is the scheme.
ProxyServer::Scheme scheme =
GetSchemeFromPacTypeInternal(pac_result_element.substr(0, space));
// And everything to the right of the space is the
// <host>[":" <port>].
return FromSchemeHostAndPort(scheme, pac_result_element.substr(space));
}
std::string ProxyChainToPacResultElement(const ProxyChain& proxy_chain) {
// TODO(https://crbug.com/1491092): Support converting a multi-hop ProxyChain
// to a PAC script format.
CHECK(!proxy_chain.is_multi_proxy());
return ProxyServerToPacResultElement(proxy_chain.proxy_server());
}
std::string ProxyServerToPacResultElement(const ProxyServer& proxy_server) {
switch (proxy_server.scheme()) {
case ProxyServer::SCHEME_DIRECT:
return "DIRECT";
case ProxyServer::SCHEME_HTTP:
return std::string("PROXY ") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_SOCKS4:
// For compatibility send SOCKS instead of SOCKS4.
return std::string("SOCKS ") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_SOCKS5:
return std::string("SOCKS5 ") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_HTTPS:
return std::string("HTTPS ") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_QUIC:
return std::string("QUIC ") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
default:
// Got called with an invalid scheme.
NOTREACHED();
return std::string();
}
}
ProxyChain ProxyUriToProxyChain(base::StringPiece uri,
ProxyServer::Scheme default_scheme) {
return ProxyChain(ProxyUriToProxyServer(uri, default_scheme));
}
ProxyServer ProxyUriToProxyServer(base::StringPiece uri,
ProxyServer::Scheme default_scheme) {
// We will default to |default_scheme| if no scheme specifier was given.
ProxyServer::Scheme scheme = default_scheme;
// Trim the leading/trailing whitespace.
uri = HttpUtil::TrimLWS(uri);
// Check for [<scheme> "://"]
size_t colon = uri.find(':');
if (colon != base::StringPiece::npos && uri.size() - colon >= 3 &&
uri[colon + 1] == '/' && uri[colon + 2] == '/') {
scheme = GetSchemeFromUriScheme(uri.substr(0, colon));
uri = uri.substr(colon + 3); // Skip past the "://"
}
// Now parse the <host>[":"<port>].
return FromSchemeHostAndPort(scheme, uri);
}
std::string ProxyServerToProxyUri(const ProxyServer& proxy_server) {
switch (proxy_server.scheme()) {
case ProxyServer::SCHEME_DIRECT:
return "direct://";
case ProxyServer::SCHEME_HTTP:
// Leave off "http://" since it is our default scheme.
return ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_SOCKS4:
return std::string("socks4://") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_SOCKS5:
return std::string("socks5://") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_HTTPS:
return std::string("https://") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
case ProxyServer::SCHEME_QUIC:
return std::string("quic://") +
ConstructHostPortString(proxy_server.GetHost(),
proxy_server.GetPort());
default:
// Got called with an invalid scheme.
NOTREACHED();
return std::string();
}
}
ProxyServer::Scheme GetSchemeFromUriScheme(base::StringPiece scheme) {
if (base::EqualsCaseInsensitiveASCII(scheme, "http"))
return ProxyServer::SCHEME_HTTP;
if (base::EqualsCaseInsensitiveASCII(scheme, "socks4"))
return ProxyServer::SCHEME_SOCKS4;
if (base::EqualsCaseInsensitiveASCII(scheme, "socks"))
return ProxyServer::SCHEME_SOCKS5;
if (base::EqualsCaseInsensitiveASCII(scheme, "socks5"))
return ProxyServer::SCHEME_SOCKS5;
if (base::EqualsCaseInsensitiveASCII(scheme, "direct"))
return ProxyServer::SCHEME_DIRECT;
if (base::EqualsCaseInsensitiveASCII(scheme, "https"))
return ProxyServer::SCHEME_HTTPS;
if (base::EqualsCaseInsensitiveASCII(scheme, "quic"))
return ProxyServer::SCHEME_QUIC;
return ProxyServer::SCHEME_INVALID;
}
} // namespace net
|
