1 // Copyright 2014 The Chromium OS 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 <brillo/dbus/utils.h> 6 7 #include <tuple> 8 #include <vector> 9 10 #include <base/bind.h> 11 #include <brillo/errors/error_codes.h> 12 #include <brillo/strings/string_utils.h> 13 14 namespace brillo { 15 namespace dbus_utils { 16 17 std::unique_ptr<dbus::Response> CreateDBusErrorResponse( 18 dbus::MethodCall* method_call, 19 const std::string& error_name, 20 const std::string& error_message) { 21 return dbus::ErrorResponse::FromMethodCall(method_call, error_name, 22 error_message); 23 } 24 25 std::unique_ptr<dbus::Response> GetDBusError(dbus::MethodCall* method_call, 26 const brillo::Error* error) { 27 CHECK(error) << "Error object must be specified"; 28 std::string error_name = DBUS_ERROR_FAILED; // Default error code. 29 std::string error_message; 30 31 // Special case for "dbus" error domain. 32 // Pop the error code and message from the error chain and use them as the 33 // actual D-Bus error message. 34 if (error->GetDomain() == errors::dbus::kDomain) { 35 error_name = error->GetCode(); 36 error_message = error->GetMessage(); 37 error = error->GetInnerError(); 38 } 39 40 // Append any inner errors to the error message. 41 while (error) { 42 // Format error string as "domain/code:message". 43 if (!error_message.empty()) 44 error_message += ';'; 45 error_message += 46 error->GetDomain() + '/' + error->GetCode() + ':' + error->GetMessage(); 47 error = error->GetInnerError(); 48 } 49 return CreateDBusErrorResponse(method_call, error_name, error_message); 50 } 51 52 void AddDBusError(brillo::ErrorPtr* error, 53 const std::string& dbus_error_name, 54 const std::string& dbus_error_message) { 55 std::vector<std::string> parts = string_utils::Split(dbus_error_message, ";"); 56 std::vector<std::tuple<std::string, std::string, std::string>> errors; 57 for (const std::string& part : parts) { 58 // Each part should be in format of "domain/code:message" 59 size_t slash_pos = part.find('/'); 60 size_t colon_pos = part.find(':'); 61 if (slash_pos != std::string::npos && colon_pos != std::string::npos && 62 slash_pos < colon_pos) { 63 // If we have both '/' and ':' and in proper order, then we have a 64 // correctly encoded error object. 65 std::string domain = part.substr(0, slash_pos); 66 std::string code = part.substr(slash_pos + 1, colon_pos - slash_pos - 1); 67 std::string message = part.substr(colon_pos + 1); 68 errors.emplace_back(domain, code, message); 69 } else if (slash_pos == std::string::npos && 70 colon_pos == std::string::npos && errors.empty()) { 71 // If we don't have both '/' and ':' and this is the first error object, 72 // then we had a D-Bus error at the top of the error chain. 73 errors.emplace_back(errors::dbus::kDomain, dbus_error_name, part); 74 } else { 75 // We have a malformed part. The whole D-Bus error was most likely 76 // not generated by GetDBusError(). To be safe, stop parsing it 77 // and return the error as received from D-Bus. 78 errors.clear(); // Remove any errors accumulated so far. 79 errors.emplace_back( 80 errors::dbus::kDomain, dbus_error_name, dbus_error_message); 81 break; 82 } 83 } 84 85 // Go backwards and add the parsed errors to the error chain. 86 for (auto it = errors.crbegin(); it != errors.crend(); ++it) { 87 Error::AddTo( 88 error, FROM_HERE, std::get<0>(*it), std::get<1>(*it), std::get<2>(*it)); 89 } 90 } 91 92 } // namespace dbus_utils 93 } // namespace brillo 94
