AU: Full proxy support

chrome_browser_proxy_resolver.cc

+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "update_engine/chrome_browser_proxy_resolver.h"
+
+#include <map>
+#include <string>
+
+#include <base/string_tokenizer.h>
+#include <base/string_util.h>
+#include <dbus/dbus-glib.h>
+#include <dbus/dbus-glib-lowlevel.h>
+#include <google/protobuf/stubs/common.h>
+
+#include "update_engine/dbus_constants.h"
+#include "update_engine/utils.h"
+
+namespace chromeos_update_engine {
+
+using google::protobuf::Closure;
+using google::protobuf::NewCallback;
+using std::deque;
+using std::make_pair;
+using std::multimap;
+using std::pair;
+using std::string;
+
+#define LIB_CROS_PROXY_RESOLVE_NAME "ProxyResolved"
+#define LIB_CROS_PROXY_RESOLVE_SIGNAL_INTERFACE                 \
+  "org.chromium.UpdateEngineLibcrosProxyResolvedInterface"
+const char kLibCrosServiceName[] = "org.chromium.LibCrosService";
+const char kLibCrosServicePath[] = "/org/chromium/LibCrosService";
+const char kLibCrosServiceInterface[] = "org.chromium.LibCrosServiceInterface";
+const char kLibCrosServiceResolveNetworkProxyMethodName[] =
+    "ResolveNetworkProxy";
+const char kLibCrosProxyResolveName[] = LIB_CROS_PROXY_RESOLVE_NAME;
+const char kLibCrosProxyResolveSignalInterface[] =
+    LIB_CROS_PROXY_RESOLVE_SIGNAL_INTERFACE;
+const char kLibCrosProxyResolveSignalFilter[] = "type='signal', "
+    "interface='" LIB_CROS_PROXY_RESOLVE_SIGNAL_INTERFACE "', "
+    "path='/', "
+    "member='" LIB_CROS_PROXY_RESOLVE_NAME "'";
+#undef LIB_CROS_PROXY_RESOLVE_SIGNAL_INTERFACE
+#undef LIB_CROS_PROXY_RESOLVE_NAME
+
+namespace {
+const int kTimeout = 5;  // seconds
+
+DBusGProxy* GetProxy(DbusGlibInterface* dbus) {
+  GError* error = NULL;
+
+  DBusGConnection* bus = dbus->BusGet(DBUS_BUS_SYSTEM, &error);
+  if (!bus) {
+    LOG(ERROR) << "Failed to get bus";
+    return NULL;
+  }
+  DBusGProxy* proxy = dbus->ProxyNewForNameOwner(bus,
+                                                 kLibCrosServiceName,
+                                                 kLibCrosServicePath,
+                                                 kLibCrosServiceInterface,
+                                                 &error);
+  if (!proxy) {
+    LOG(ERROR) << "Error getting dbus proxy for "
+               << kLibCrosServiceName << ": " << utils::GetGErrorMessage(error);
+    return NULL;
+  }
+  return proxy;
+}
+
+}  // namespace {}
+
+ChromeBrowserProxyResolver::ChromeBrowserProxyResolver(DbusGlibInterface* dbus)
+    : dbus_(dbus), proxy_(NULL), timeout_(kTimeout) {}
+
+bool ChromeBrowserProxyResolver::Init() {
+  // Set up signal handler. Code lifted from libcros
+  if (proxy_) {
+    // Already initialized
+    return true;
+  }
+  GError* gerror = NULL;
+  DBusGConnection* gbus = dbus_->BusGet(DBUS_BUS_SYSTEM, &gerror);
+  TEST_AND_RETURN_FALSE(gbus);
+  DBusConnection* connection = dbus_->ConnectionGetConnection(gbus);
+  TEST_AND_RETURN_FALSE(connection);
+  DBusError error;
+  dbus_error_init(&error);
+  dbus_->DbusBusAddMatch(connection, kLibCrosProxyResolveSignalFilter, &error);
+  TEST_AND_RETURN_FALSE(!dbus_error_is_set(&error));
+  TEST_AND_RETURN_FALSE(dbus_->DbusConnectionAddFilter(
+      connection,
+      &ChromeBrowserProxyResolver::StaticFilterMessage,
+      this,
+      NULL));
+
+  proxy_ = GetProxy(dbus_);
+  if (!proxy_) {
+    dbus_->DbusConnectionRemoveFilter(
+        connection,
+        &ChromeBrowserProxyResolver::StaticFilterMessage,
+        this);
+  }
+  TEST_AND_RETURN_FALSE(proxy_);  // For the error log
+  return true;
+}
+
+ChromeBrowserProxyResolver::~ChromeBrowserProxyResolver() {
+  if (proxy_) {
+    GError* gerror = NULL;
+    DBusGConnection* gbus = dbus_->BusGet(DBUS_BUS_SYSTEM, &gerror);
+    TEST_AND_RETURN(gbus);
+    DBusConnection* connection = dbus_->ConnectionGetConnection(gbus);
+    dbus_->DbusConnectionRemoveFilter(
+        connection,
+        &ChromeBrowserProxyResolver::StaticFilterMessage,
+        this);
+  }
+  // Kill outstanding timers
+  for (TimeoutsMap::iterator it = timers_.begin(), e = timers_.end(); it != e;
+       ++it) {
+    g_source_destroy(it->second);
+    it->second = NULL;
+  }
+}
+
+bool ChromeBrowserProxyResolver::GetProxiesForUrl(const string& url,
+                                                  ProxiesResolvedFn callback,
+                                                  void* data) {
+  GError* error = NULL;
+  TEST_AND_RETURN_FALSE(proxy_);
+  if (!dbus_->ProxyCall(
+          proxy_,
+          kLibCrosServiceResolveNetworkProxyMethodName,
+          &error,
+          G_TYPE_STRING, url.c_str(),
+          G_TYPE_STRING, kLibCrosProxyResolveSignalInterface,
+          G_TYPE_STRING, kLibCrosProxyResolveName,
+          G_TYPE_INVALID, G_TYPE_INVALID)) {
+    LOG(ERROR) << "dbus_g_proxy_call failed: "
+               << utils::GetGErrorMessage(error);
+    return false;
+  }
+  callbacks_.insert(make_pair(url, make_pair(callback, data)));
+  Closure* closure = NewCallback(this,
+                                 &ChromeBrowserProxyResolver::HandleTimeout,
+                                 url);
+  GSource* timer = g_timeout_source_new_seconds(timeout_);
+  g_source_set_callback(timer, &utils::GlibRunClosure, closure, NULL);
+  g_source_attach(timer, NULL);
+  timers_.insert(make_pair(url, timer));
+  return true;
+}
+
+DBusHandlerResult ChromeBrowserProxyResolver::FilterMessage(
+    DBusConnection* connection,
+    DBusMessage* message) {
+  // Code lifted from libcros.
+  if (!dbus_->DbusMessageIsSignal(message,
+                                  kLibCrosProxyResolveSignalInterface,
+                                  kLibCrosProxyResolveName)) {
+    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+  }
+  // Get args
+  char* source_url = NULL;
+  char* proxy_list = NULL;
+  char* error = NULL;
+  DBusError arg_error;
+  dbus_error_init(&arg_error);
+  if (!dbus_->DbusMessageGetArgs(message, &arg_error,
+                                 DBUS_TYPE_STRING, &source_url,
+                                 DBUS_TYPE_STRING, &proxy_list,
+                                 DBUS_TYPE_STRING, &error,
+                                 DBUS_TYPE_INVALID)) {
+    LOG(ERROR) << "Error reading dbus signal.";
+    return DBUS_HANDLER_RESULT_HANDLED;
+  }
+  if (!source_url || !proxy_list) {
+    LOG(ERROR) << "Error getting url, proxy list from dbus signal.";
+    return DBUS_HANDLER_RESULT_HANDLED;
+  }
+  HandleReply(source_url, proxy_list);
+  return DBUS_HANDLER_RESULT_HANDLED;
+}
+
+bool ChromeBrowserProxyResolver::DeleteUrlState(
+    const string& source_url,
+    bool delete_timer,
+    pair<ProxiesResolvedFn, void*>* callback) {
+  {
+    CallbacksMap::iterator it = callbacks_.lower_bound(source_url);
+    TEST_AND_RETURN_FALSE(it != callbacks_.end());
+    TEST_AND_RETURN_FALSE(it->first == source_url);
+    if (callback)
+      *callback = it->second;
+    callbacks_.erase(it);
+  }
+  {
+    TimeoutsMap::iterator it = timers_.lower_bound(source_url);
+    TEST_AND_RETURN_FALSE(it != timers_.end());
+    TEST_AND_RETURN_FALSE(it->first == source_url);
+    if (delete_timer)
+      g_source_destroy(it->second);
+    timers_.erase(it);
+  }
+  return true;
+}
+
+void ChromeBrowserProxyResolver::HandleReply(const string& source_url,
+                                             const string& proxy_list) {
+  pair<ProxiesResolvedFn, void*> callback;
+  TEST_AND_RETURN(DeleteUrlState(source_url, true, &callback));
+  (*callback.first)(ParseProxyString(proxy_list), callback.second);
+}
+
+void ChromeBrowserProxyResolver::HandleTimeout(string source_url) {
+  LOG(INFO) << "Timeout handler called. Seems Chrome isn't responding.";
+  pair<ProxiesResolvedFn, void*> callback;
+  TEST_AND_RETURN(DeleteUrlState(source_url, false, &callback));
+  deque<string> proxies;
+  proxies.push_back(kNoProxy);
+  (*callback.first)(proxies, callback.second);
+}
+
+deque<string> ChromeBrowserProxyResolver::ParseProxyString(
+    const string& input) {
+  deque<string> ret;
+  // Some of this code taken from
+  // http://src.chromium.org/svn/trunk/src/net/proxy/proxy_server.cc and
+  // http://src.chromium.org/svn/trunk/src/net/proxy/proxy_list.cc
+  StringTokenizer entry_tok(input, ";");
+  while (entry_tok.GetNext()) {
+    string token = entry_tok.token();
+    TrimWhitespaceASCII(token, TRIM_ALL, &token);
+
+    // Start by finding the first space (if any).
+    std::string::iterator space;
+    for (space = token.begin(); space != token.end(); ++space) {
+      if (IsAsciiWhitespace(*space)) {
+        break;
+      }
+    }
+
+    string scheme = string(token.begin(), space);
+    StringToLowerASCII(&scheme);
+    // Chrome uses "socks" to mean socks4 and "proxy" to mean http.
+    if (scheme == "socks")
+      scheme += "4";
+    else if (scheme == "proxy")
+      scheme = "http";
+    else if (scheme != "https" &&
+             scheme != "socks4" &&
+             scheme != "socks5" &&
+             scheme != "direct")
+      continue;  // Invalid proxy scheme
+
+    string host_and_port = string(space, token.end());
+    TrimWhitespaceASCII(host_and_port, TRIM_ALL, &host_and_port);
+    if (scheme != "direct" && host_and_port.empty())
+      continue;  // Must supply host/port when non-direct proxy used.
+    ret.push_back(scheme + "://" + host_and_port);
+  }
+  if (ret.empty() || *ret.rbegin() != kNoProxy)
+    ret.push_back(kNoProxy);
+  return ret;
+}
+
+}  // namespace chromeos_update_engine