| // 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 <sysexits.h> |
| #include <unistd.h> // for isatty() |
| |
| #include <string> |
| #include <vector> |
| |
| #include <base/command_line.h> |
| #include <base/strings/string_number_conversions.h> |
| #include <base/strings/string_tokenizer.h> |
| #include <base/strings/string_util.h> |
| #include <base/values.h> |
| #include <brillo/syslog_logging.h> |
| #include <dbus/bus.h> |
| #include <dbus/message.h> |
| #include <dbus/object_proxy.h> |
| #include <chromeos/dbus/service_constants.h> |
| |
| namespace { |
| |
| const char kNoProxy[] = "direct://"; |
| |
| const int kTimeoutDefaultSeconds = 5; |
| |
| const char kHelp[] = "help"; |
| const char kQuiet[] = "quiet"; |
| const char kTimeout[] = "timeout"; |
| const char kVerbose[] = "verbose"; |
| // Help message to show when the --help command line switch is specified. |
| const char kHelpMessage[] = |
| "Chromium OS Crash helper: proxy lister\n" |
| "\n" |
| "Available Switches:\n" |
| " --quiet Only print the proxies\n" |
| " --verbose Print additional messages even when not run from a TTY\n" |
| " --timeout=N Set timeout for browser resolving proxies (default is 5)\n" |
| " --help Show this help.\n"; |
| |
| // Copied from src/update_engine/chrome_browser_proxy_resolver.cc |
| // Parses the browser's answer for resolved proxies. It returns a |
| // list of strings, each of which is a resolved proxy. |
| std::vector<std::string> ParseProxyString(const std::string& input) { |
| std::vector<std::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 |
| base::StringTokenizer entry_tok(input, ";"); |
| while (entry_tok.GetNext()) { |
| std::string token = entry_tok.token(); |
| base::TrimWhitespaceASCII(token, base::TRIM_ALL, &token); |
| |
| // Start by finding the first space (if any). |
| std::string::iterator space; |
| for (space = token.begin(); space != token.end(); ++space) { |
| if (base::IsAsciiWhitespace(*space)) { |
| break; |
| } |
| } |
| |
| std::string scheme = base::ToLowerASCII(std::string(token.begin(), space)); |
| // 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 |
| |
| std::string host_and_port = std::string(space, token.end()); |
| base::TrimWhitespaceASCII(host_and_port, base::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; |
| } |
| |
| bool ShowBrowserProxies(const std::string& url, base::TimeDelta timeout) { |
| dbus::Bus::Options options; |
| options.bus_type = dbus::Bus::SYSTEM; |
| scoped_refptr<dbus::Bus> bus = new dbus::Bus(options); |
| if (!bus->Connect()) { |
| LOG(ERROR) << "Failed to connect to system bus"; |
| return false; |
| } |
| |
| dbus::MethodCall method_call( |
| chromeos::kNetworkProxyServiceInterface, |
| chromeos::kNetworkProxyServiceResolveProxyMethod); |
| dbus::MessageWriter writer(&method_call); |
| writer.AppendString(url); |
| |
| dbus::ObjectProxy* proxy = bus->GetObjectProxy( |
| chromeos::kNetworkProxyServiceName, |
| dbus::ObjectPath(chromeos::kNetworkProxyServicePath)); |
| std::unique_ptr<dbus::Response> response = |
| proxy->CallMethodAndBlock(&method_call, timeout.InMilliseconds()); |
| if (!response) { |
| LOG(ERROR) << "Failed to get response"; |
| return false; |
| } |
| |
| dbus::MessageReader reader(response.get()); |
| std::string proxy_info, error; |
| if (!reader.PopString(&proxy_info) || !reader.PopString(&error)) { |
| LOG(ERROR) << "Invalid arguments in response"; |
| return false; |
| } |
| |
| std::vector<std::string> proxies = ParseProxyString(proxy_info); |
| LOG(INFO) << "Got proxies: " << base::JoinString(proxies, "x"); |
| for (const auto& proxy : proxies) { |
| printf("%s\n", proxy.c_str()); |
| } |
| return true; |
| } |
| |
| } // namespace |
| |
| int main(int argc, char *argv[]) { |
| base::CommandLine::Init(argc, argv); |
| base::CommandLine* cl = base::CommandLine::ForCurrentProcess(); |
| |
| if (cl->HasSwitch(kHelp)) { |
| LOG(INFO) << kHelpMessage; |
| return 0; |
| } |
| |
| bool quiet = cl->HasSwitch(kQuiet); |
| bool verbose = cl->HasSwitch(kVerbose); |
| |
| int timeout = kTimeoutDefaultSeconds; |
| std::string str_timeout = cl->GetSwitchValueASCII(kTimeout); |
| if (!str_timeout.empty() && !base::StringToInt(str_timeout, &timeout)) { |
| LOG(ERROR) << "Invalid timeout value: " << str_timeout; |
| return 1; |
| } |
| |
| // Default to logging to syslog. |
| int init_flags = brillo::kLogToSyslog; |
| // Log to stderr if a TTY (and "-quiet" wasn't passed), or if "-verbose" |
| // was passed. |
| |
| if ((!quiet && isatty(STDERR_FILENO)) || verbose) |
| init_flags |= brillo::kLogToStderr; |
| brillo::InitLog(init_flags); |
| |
| std::string url; |
| base::CommandLine::StringVector urls = cl->GetArgs(); |
| if (!urls.empty()) { |
| url = urls[0]; |
| LOG(INFO) << "Resolving proxies for URL: " << url; |
| } else { |
| LOG(INFO) << "Resolving proxies without URL"; |
| } |
| |
| if (!ShowBrowserProxies(url, base::TimeDelta::FromSeconds(timeout))) { |
| LOG(ERROR) << "Error resolving proxies"; |
| LOG(INFO) << "Assuming direct proxy"; |
| printf("%s\n", kNoProxy); |
| } |
| |
| return 0; |
| } |