net/proxy/proxy_resolver_mac.cc

   1 // Copyright (c) 2011 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_resolver_mac.h"
   6
   7 #include <CoreFoundation/CoreFoundation.h>
   8
   9 #include "base/logging.h"
  10 #include "base/mac/foundation_util.h"
  11 #include "base/mac/scoped_cftyperef.h"
  12 #include "base/strings/string_util.h"
  13 #include "base/strings/sys_string_conversions.h"
  14 #include "net/base/net_errors.h"
  15 #include "net/proxy/proxy_info.h"
  16 #include "net/proxy/proxy_resolver.h"
  17 #include "net/proxy/proxy_server.h"
  18
  19 #if defined(OS_IOS)
  20 #include <CFNetwork/CFProxySupport.h>
  21 #else
  22 #include <CoreServices/CoreServices.h>
  23 #endif
  24
  25 namespace net {
  26
  27 namespace {
  28
  29 // Utility function to map a CFProxyType to a ProxyServer::Scheme.
  30 // If the type is unknown, returns ProxyServer::SCHEME_INVALID.
  31 ProxyServer::Scheme GetProxyServerScheme(CFStringRef proxy_type) {
  32   if (CFEqual(proxy_type, kCFProxyTypeNone))
  33     return ProxyServer::SCHEME_DIRECT;
  34   if (CFEqual(proxy_type, kCFProxyTypeHTTP))
  35     return ProxyServer::SCHEME_HTTP;
  36   if (CFEqual(proxy_type, kCFProxyTypeHTTPS)) {
  37     // The "HTTPS" on the Mac side here means "proxy applies to https://" URLs;
  38     // the proxy itself is still expected to be an HTTP proxy.
  39     return ProxyServer::SCHEME_HTTP;
  40   }
  41   if (CFEqual(proxy_type, kCFProxyTypeSOCKS)) {
  42     // We can't tell whether this was v4 or v5. We will assume it is
  43     // v5 since that is the only version OS X supports.
  44     return ProxyServer::SCHEME_SOCKS5;
  45   }
  46   return ProxyServer::SCHEME_INVALID;
  47 }
  48
  49 // Callback for CFNetworkExecuteProxyAutoConfigurationURL. |client| is a pointer
  50 // to a CFTypeRef.  This stashes either |error| or |proxies| in that location.
  51 void ResultCallback(void* client, CFArrayRef proxies, CFErrorRef error) {
  52   DCHECK((proxies != NULL) == (error == NULL));
  53
  54   CFTypeRef* result_ptr = reinterpret_cast<CFTypeRef*>(client);
  55   DCHECK(result_ptr != NULL);
  56   DCHECK(*result_ptr == NULL);
  57
  58   if (error != NULL) {
  59     *result_ptr = CFRetain(error);
  60   } else {
  61     *result_ptr = CFRetain(proxies);
  62   }
  63   CFRunLoopStop(CFRunLoopGetCurrent());
  64 }
  65
  66 class ProxyResolverMac : public ProxyResolver {
  67  public:
  68   explicit ProxyResolverMac(
  69       const scoped_refptr<ProxyResolverScriptData>& script_data);
  70   ~ProxyResolverMac() override;
  71
  72   // ProxyResolver methods:
  73   int GetProxyForURL(const GURL& url,
  74                      ProxyInfo* results,
  75                      const CompletionCallback& callback,
  76                      RequestHandle* request,
  77                      const BoundNetLog& net_log) override;
  78
  79   void CancelRequest(RequestHandle request) override;
  80
  81   LoadState GetLoadState(RequestHandle request) const override;
  82
  83  private:
  84   const scoped_refptr<ProxyResolverScriptData> script_data_;
  85 };
  86
  87 ProxyResolverMac::ProxyResolverMac(
  88     const scoped_refptr<ProxyResolverScriptData>& script_data)
  89     : script_data_(script_data) {
  90 }
  91
  92 ProxyResolverMac::~ProxyResolverMac() {}
  93
  94 // Gets the proxy information for a query URL from a PAC. Implementation
  95 // inspired by http://developer.apple.com/samplecode/CFProxySupportTool/
  96 int ProxyResolverMac::GetProxyForURL(const GURL& query_url,
  97                                      ProxyInfo* results,
  98                                      const CompletionCallback& /*callback*/,
  99                                      RequestHandle* /*request*/,
 100                                      const BoundNetLog& net_log) {
 101   base::ScopedCFTypeRef<CFStringRef> query_ref(
 102       base::SysUTF8ToCFStringRef(query_url.spec()));
 103   base::ScopedCFTypeRef<CFURLRef> query_url_ref(
 104       CFURLCreateWithString(kCFAllocatorDefault, query_ref.get(), NULL));
 105   if (!query_url_ref.get())
 106     return ERR_FAILED;
 107   base::ScopedCFTypeRef<CFStringRef> pac_ref(base::SysUTF8ToCFStringRef(
 108       script_data_->type() == ProxyResolverScriptData::TYPE_AUTO_DETECT
 109           ? std::string()
 110           : script_data_->url().spec()));
 111   base::ScopedCFTypeRef<CFURLRef> pac_url_ref(
 112       CFURLCreateWithString(kCFAllocatorDefault, pac_ref.get(), NULL));
 113   if (!pac_url_ref.get())
 114     return ERR_FAILED;
 115
 116   // Work around <rdar://problem/5530166>. This dummy call to
 117   // CFNetworkCopyProxiesForURL initializes some state within CFNetwork that is
 118   // required by CFNetworkExecuteProxyAutoConfigurationURL.
 119
 120   base::ScopedCFTypeRef<CFDictionaryRef> empty_dictionary(
 121       CFDictionaryCreate(NULL, NULL, NULL, 0, NULL, NULL));
 122   CFArrayRef dummy_result =
 123       CFNetworkCopyProxiesForURL(query_url_ref.get(), empty_dictionary);
 124   if (dummy_result)
 125     CFRelease(dummy_result);
 126
 127   // We cheat here. We need to act as if we were synchronous, so we pump the
 128   // runloop ourselves. Our caller moved us to a new thread anyway, so this is
 129   // OK to do. (BTW, CFNetworkExecuteProxyAutoConfigurationURL returns a
 130   // runloop source we need to release despite its name.)
 131
 132   CFTypeRef result = NULL;
 133   CFStreamClientContext context = { 0, &result, NULL, NULL, NULL };
 134   base::ScopedCFTypeRef<CFRunLoopSourceRef> runloop_source(
 135       CFNetworkExecuteProxyAutoConfigurationURL(
 136           pac_url_ref.get(), query_url_ref.get(), ResultCallback, &context));
 137   if (!runloop_source)
 138     return ERR_FAILED;
 139
 140   const CFStringRef private_runloop_mode =
 141       CFSTR("org.chromium.ProxyResolverMac");
 142
 143   CFRunLoopAddSource(CFRunLoopGetCurrent(), runloop_source.get(),
 144                      private_runloop_mode);
 145   CFRunLoopRunInMode(private_runloop_mode, DBL_MAX, false);
 146   CFRunLoopSourceInvalidate(runloop_source.get());
 147   DCHECK(result != NULL);
 148
 149   if (CFGetTypeID(result) == CFErrorGetTypeID()) {
 150     // TODO(avi): do something better than this
 151     CFRelease(result);
 152     return ERR_FAILED;
 153   }
 154   base::ScopedCFTypeRef<CFArrayRef> proxy_array_ref(
 155       base::mac::CFCastStrict<CFArrayRef>(result));
 156   DCHECK(proxy_array_ref != NULL);
 157
 158   // This string will be an ordered list of <proxy-uri> entries, separated by
 159   // semi-colons. It is the format that ProxyInfo::UseNamedProxy() expects.
 160   //    proxy-uri = [<proxy-scheme>"://"]<proxy-host>":"<proxy-port>
 161   // (This also includes entries for direct connection, as "direct://").
 162   std::string proxy_uri_list;
 163
 164   CFIndex proxy_array_count = CFArrayGetCount(proxy_array_ref.get());
 165   for (CFIndex i = 0; i < proxy_array_count; ++i) {
 166     CFDictionaryRef proxy_dictionary = base::mac::CFCastStrict<CFDictionaryRef>(
 167         CFArrayGetValueAtIndex(proxy_array_ref.get(), i));
 168     DCHECK(proxy_dictionary != NULL);
 169
 170     // The dictionary may have the following keys:
 171     // - kCFProxyTypeKey : The type of the proxy
 172     // - kCFProxyHostNameKey
 173     // - kCFProxyPortNumberKey : The meat we're after.
 174     // - kCFProxyUsernameKey
 175     // - kCFProxyPasswordKey : Despite the existence of these keys in the
 176     //                         documentation, they're never populated. Even if a
 177     //                         username/password were to be set in the network
 178     //                         proxy system preferences, we'd need to fetch it
 179     //                         from the Keychain ourselves. CFProxy is such a
 180     //                         tease.
 181     // - kCFProxyAutoConfigurationURLKey : If the PAC file specifies another
 182     //                                     PAC file, I'm going home.
 183
 184     CFStringRef proxy_type = base::mac::GetValueFromDictionary<CFStringRef>(
 185         proxy_dictionary, kCFProxyTypeKey);
 186     ProxyServer proxy_server = ProxyServer::FromDictionary(
 187         GetProxyServerScheme(proxy_type),
 188         proxy_dictionary,
 189         kCFProxyHostNameKey,
 190         kCFProxyPortNumberKey);
 191     if (!proxy_server.is_valid())
 192       continue;
 193
 194     if (!proxy_uri_list.empty())
 195       proxy_uri_list += ";";
 196     proxy_uri_list += proxy_server.ToURI();
 197   }
 198
 199   if (!proxy_uri_list.empty())
 200     results->UseNamedProxy(proxy_uri_list);
 201   // Else do nothing (results is already guaranteed to be in the default state).
 202
 203   return OK;
 204 }
 205
 206 void ProxyResolverMac::CancelRequest(RequestHandle request) {
 207   NOTREACHED();
 208 }
 209
 210 LoadState ProxyResolverMac::GetLoadState(RequestHandle request) const {
 211   NOTREACHED();
 212   return LOAD_STATE_IDLE;
 213 }
 214
 215 }  // namespace
 216
 217 ProxyResolverFactoryMac::ProxyResolverFactoryMac()
 218     : ProxyResolverFactory(false /*expects_pac_bytes*/) {
 219 }
 220
 221 int ProxyResolverFactoryMac::CreateProxyResolver(
 222     const scoped_refptr<ProxyResolverScriptData>& pac_script,
 223     scoped_ptr<ProxyResolver>* resolver,
 224     const CompletionCallback& callback,
 225     scoped_ptr<Request>* request) {
 226   resolver->reset(new ProxyResolverMac(pac_script));
 227   return OK;
 228 }
 229
 230 }  // namespace net