1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "net/proxy/proxy_server.h"
6
7 #include <algorithm>
8
9 #include "base/strings/string_util.h"
10 #include "net/base/net_util.h"
11 #include "net/http/http_util.h"
12
13 namespace net {
14
15 namespace {
16
17 // Parses the proxy type from a PAC string, to a ProxyServer::Scheme.
18 // This mapping is case-insensitive. If no type could be matched
19 // returns SCHEME_INVALID.
GetSchemeFromPacTypeInternal(std::string::const_iterator begin,std::string::const_iterator end)20 ProxyServer::Scheme GetSchemeFromPacTypeInternal(
21 std::string::const_iterator begin,
22 std::string::const_iterator end) {
23 if (LowerCaseEqualsASCII(begin, end, "proxy"))
24 return ProxyServer::SCHEME_HTTP;
25 if (LowerCaseEqualsASCII(begin, end, "socks")) {
26 // Default to v4 for compatibility. This is because the SOCKS4 vs SOCKS5
27 // notation didn't originally exist, so if a client returns SOCKS they
28 // really meant SOCKS4.
29 return ProxyServer::SCHEME_SOCKS4;
30 }
31 if (LowerCaseEqualsASCII(begin, end, "socks4"))
32 return ProxyServer::SCHEME_SOCKS4;
33 if (LowerCaseEqualsASCII(begin, end, "socks5"))
34 return ProxyServer::SCHEME_SOCKS5;
35 if (LowerCaseEqualsASCII(begin, end, "direct"))
36 return ProxyServer::SCHEME_DIRECT;
37 if (LowerCaseEqualsASCII(begin, end, "https"))
38 return ProxyServer::SCHEME_HTTPS;
39 if (LowerCaseEqualsASCII(begin, end, "quic"))
40 return ProxyServer::SCHEME_QUIC;
41
42 return ProxyServer::SCHEME_INVALID;
43 }
44
45 // Parses the proxy scheme from a URL-like representation, to a
46 // ProxyServer::Scheme. This corresponds with the values used in
47 // ProxyServer::ToURI(). If no type could be matched, returns SCHEME_INVALID.
GetSchemeFromURIInternal(std::string::const_iterator begin,std::string::const_iterator end)48 ProxyServer::Scheme GetSchemeFromURIInternal(std::string::const_iterator begin,
49 std::string::const_iterator end) {
50 if (LowerCaseEqualsASCII(begin, end, "http"))
51 return ProxyServer::SCHEME_HTTP;
52 if (LowerCaseEqualsASCII(begin, end, "socks4"))
53 return ProxyServer::SCHEME_SOCKS4;
54 if (LowerCaseEqualsASCII(begin, end, "socks"))
55 return ProxyServer::SCHEME_SOCKS5;
56 if (LowerCaseEqualsASCII(begin, end, "socks5"))
57 return ProxyServer::SCHEME_SOCKS5;
58 if (LowerCaseEqualsASCII(begin, end, "direct"))
59 return ProxyServer::SCHEME_DIRECT;
60 if (LowerCaseEqualsASCII(begin, end, "https"))
61 return ProxyServer::SCHEME_HTTPS;
62 if (LowerCaseEqualsASCII(begin, end, "quic"))
63 return ProxyServer::SCHEME_QUIC;
64 return ProxyServer::SCHEME_INVALID;
65 }
66
67 } // namespace
68
ProxyServer(Scheme scheme,const HostPortPair & host_port_pair)69 ProxyServer::ProxyServer(Scheme scheme, const HostPortPair& host_port_pair)
70 : scheme_(scheme), host_port_pair_(host_port_pair) {
71 if (scheme_ == SCHEME_DIRECT || scheme_ == SCHEME_INVALID) {
72 // |host_port_pair| isn't relevant for these special schemes, so none should
73 // have been specified. It is important for this to be consistent since we
74 // do raw field comparisons in the equality and comparison functions.
75 DCHECK(host_port_pair.Equals(HostPortPair()));
76 host_port_pair_ = HostPortPair();
77 }
78 }
79
host_port_pair() const80 const HostPortPair& ProxyServer::host_port_pair() const {
81 // Doesn't make sense to call this if the URI scheme doesn't
82 // have concept of a host.
83 DCHECK(is_valid());
84 DCHECK(!is_direct());
85 return host_port_pair_;
86 }
87
88 // static
FromURI(const std::string & uri,Scheme default_scheme)89 ProxyServer ProxyServer::FromURI(const std::string& uri,
90 Scheme default_scheme) {
91 return FromURI(uri.begin(), uri.end(), default_scheme);
92 }
93
94 // static
FromURI(std::string::const_iterator begin,std::string::const_iterator end,Scheme default_scheme)95 ProxyServer ProxyServer::FromURI(std::string::const_iterator begin,
96 std::string::const_iterator end,
97 Scheme default_scheme) {
98 // We will default to |default_scheme| if no scheme specifier was given.
99 Scheme scheme = default_scheme;
100
101 // Trim the leading/trailing whitespace.
102 HttpUtil::TrimLWS(&begin, &end);
103
104 // Check for [<scheme> "://"]
105 std::string::const_iterator colon = std::find(begin, end, ':');
106 if (colon != end &&
107 (end - colon) >= 3 &&
108 *(colon + 1) == '/' &&
109 *(colon + 2) == '/') {
110 scheme = GetSchemeFromURIInternal(begin, colon);
111 begin = colon + 3; // Skip past the "://"
112 }
113
114 // Now parse the <host>[":"<port>].
115 return FromSchemeHostAndPort(scheme, begin, end);
116 }
117
ToURI() const118 std::string ProxyServer::ToURI() const {
119 switch (scheme_) {
120 case SCHEME_DIRECT:
121 return "direct://";
122 case SCHEME_HTTP:
123 // Leave off "http://" since it is our default scheme.
124 return host_port_pair().ToString();
125 case SCHEME_SOCKS4:
126 return std::string("socks4://") + host_port_pair().ToString();
127 case SCHEME_SOCKS5:
128 return std::string("socks5://") + host_port_pair().ToString();
129 case SCHEME_HTTPS:
130 return std::string("https://") + host_port_pair().ToString();
131 case SCHEME_QUIC:
132 return std::string("quic://") + host_port_pair().ToString();
133 default:
134 // Got called with an invalid scheme.
135 NOTREACHED();
136 return std::string();
137 }
138 }
139
140 // static
FromPacString(const std::string & pac_string)141 ProxyServer ProxyServer::FromPacString(const std::string& pac_string) {
142 return FromPacString(pac_string.begin(), pac_string.end());
143 }
144
145 // static
FromPacString(std::string::const_iterator begin,std::string::const_iterator end)146 ProxyServer ProxyServer::FromPacString(std::string::const_iterator begin,
147 std::string::const_iterator end) {
148 // Trim the leading/trailing whitespace.
149 HttpUtil::TrimLWS(&begin, &end);
150
151 // Input should match:
152 // "DIRECT" | ( <type> 1*(LWS) <host-and-port> )
153
154 // Start by finding the first space (if any).
155 std::string::const_iterator space;
156 for (space = begin; space != end; ++space) {
157 if (HttpUtil::IsLWS(*space)) {
158 break;
159 }
160 }
161
162 // Everything to the left of the space is the scheme.
163 Scheme scheme = GetSchemeFromPacTypeInternal(begin, space);
164
165 // And everything to the right of the space is the
166 // <host>[":" <port>].
167 return FromSchemeHostAndPort(scheme, space, end);
168 }
169
ToPacString() const170 std::string ProxyServer::ToPacString() const {
171 switch (scheme_) {
172 case SCHEME_DIRECT:
173 return "DIRECT";
174 case SCHEME_HTTP:
175 return std::string("PROXY ") + host_port_pair().ToString();
176 case SCHEME_SOCKS4:
177 // For compatibility send SOCKS instead of SOCKS4.
178 return std::string("SOCKS ") + host_port_pair().ToString();
179 case SCHEME_SOCKS5:
180 return std::string("SOCKS5 ") + host_port_pair().ToString();
181 case SCHEME_HTTPS:
182 return std::string("HTTPS ") + host_port_pair().ToString();
183 case SCHEME_QUIC:
184 return std::string("QUIC ") + host_port_pair().ToString();
185 default:
186 // Got called with an invalid scheme.
187 NOTREACHED();
188 return std::string();
189 }
190 }
191
192 // static
GetDefaultPortForScheme(Scheme scheme)193 int ProxyServer::GetDefaultPortForScheme(Scheme scheme) {
194 switch (scheme) {
195 case SCHEME_HTTP:
196 return 80;
197 case SCHEME_SOCKS4:
198 case SCHEME_SOCKS5:
199 return 1080;
200 case SCHEME_HTTPS:
201 case SCHEME_QUIC:
202 return 443;
203 case SCHEME_INVALID:
204 case SCHEME_DIRECT:
205 break;
206 }
207 return -1;
208 }
209
210 // static
GetSchemeFromURI(const std::string & scheme)211 ProxyServer::Scheme ProxyServer::GetSchemeFromURI(const std::string& scheme) {
212 return GetSchemeFromURIInternal(scheme.begin(), scheme.end());
213 }
214
215 // static
FromSchemeHostAndPort(Scheme scheme,std::string::const_iterator begin,std::string::const_iterator end)216 ProxyServer ProxyServer::FromSchemeHostAndPort(
217 Scheme scheme,
218 std::string::const_iterator begin,
219 std::string::const_iterator end) {
220
221 // Trim leading/trailing space.
222 HttpUtil::TrimLWS(&begin, &end);
223
224 if (scheme == SCHEME_DIRECT && begin != end)
225 return ProxyServer(); // Invalid -- DIRECT cannot have a host/port.
226
227 HostPortPair host_port_pair;
228
229 if (scheme != SCHEME_INVALID && scheme != SCHEME_DIRECT) {
230 std::string host;
231 int port = -1;
232 // If the scheme has a host/port, parse it.
233 bool ok = net::ParseHostAndPort(begin, end, &host, &port);
234 if (!ok)
235 return ProxyServer(); // Invalid -- failed parsing <host>[":"<port>]
236
237 // Choose a default port number if none was given.
238 if (port == -1)
239 port = GetDefaultPortForScheme(scheme);
240
241 host_port_pair = HostPortPair(host, port);
242 }
243
244 return ProxyServer(scheme, host_port_pair);
245 }
246
247 } // namespace net
248