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 <base/memory/scoped_ptr.h> 12 #include <brillo/errors/error_codes.h> 13 #include <brillo/strings/string_utils.h> 14 15 namespace brillo { 16 namespace dbus_utils { 17 18 std::unique_ptr<dbus::Response> CreateDBusErrorResponse( 19 dbus::MethodCall* method_call, 20 const std::string& error_name, 21 const std::string& error_message) { 22 auto resp = dbus::ErrorResponse::FromMethodCall( 23 method_call, error_name, error_message); 24 return std::unique_ptr<dbus::Response>(resp.release()); 25 } 26 27 std::unique_ptr<dbus::Response> GetDBusError(dbus::MethodCall* method_call, 28 const brillo::Error* error) { 29 CHECK(error) << "Error object must be specified"; 30 std::string error_name = DBUS_ERROR_FAILED; // Default error code. 31 std::string error_message; 32 33 // Special case for "dbus" error domain. 34 // Pop the error code and message from the error chain and use them as the 35 // actual D-Bus error message. 36 if (error->GetDomain() == errors::dbus::kDomain) { 37 error_name = error->GetCode(); 38 error_message = error->GetMessage(); 39 error = error->GetInnerError(); 40 } 41 42 // Append any inner errors to the error message. 43 while (error) { 44 // Format error string as "domain/code:message". 45 if (!error_message.empty()) 46 error_message += ';'; 47 error_message += 48 error->GetDomain() + '/' + error->GetCode() + ':' + error->GetMessage(); 49 error = error->GetInnerError(); 50 } 51 return CreateDBusErrorResponse(method_call, error_name, error_message); 52 } 53 54 void AddDBusError(brillo::ErrorPtr* error, 55 const std::string& dbus_error_name, 56 const std::string& dbus_error_message) { 57 std::vector<std::string> parts = string_utils::Split(dbus_error_message, ";"); 58 std::vector<std::tuple<std::string, std::string, std::string>> errors; 59 for (const std::string& part : parts) { 60 // Each part should be in format of "domain/code:message" 61 size_t slash_pos = part.find('/'); 62 size_t colon_pos = part.find(':'); 63 if (slash_pos != std::string::npos && colon_pos != std::string::npos && 64 slash_pos < colon_pos) { 65 // If we have both '/' and ':' and in proper order, then we have a 66 // correctly encoded error object. 67 std::string domain = part.substr(0, slash_pos); 68 std::string code = part.substr(slash_pos + 1, colon_pos - slash_pos - 1); 69 std::string message = part.substr(colon_pos + 1); 70 errors.emplace_back(domain, code, message); 71 } else if (slash_pos == std::string::npos && 72 colon_pos == std::string::npos && errors.empty()) { 73 // If we don't have both '/' and ':' and this is the first error object, 74 // then we had a D-Bus error at the top of the error chain. 75 errors.emplace_back(errors::dbus::kDomain, dbus_error_name, part); 76 } else { 77 // We have a malformed part. The whole D-Bus error was most likely 78 // not generated by GetDBusError(). To be safe, stop parsing it 79 // and return the error as received from D-Bus. 80 errors.clear(); // Remove any errors accumulated so far. 81 errors.emplace_back( 82 errors::dbus::kDomain, dbus_error_name, dbus_error_message); 83 break; 84 } 85 } 86 87 // Go backwards and add the parsed errors to the error chain. 88 for (auto it = errors.crbegin(); it != errors.crend(); ++it) { 89 Error::AddTo( 90 error, FROM_HERE, std::get<0>(*it), std::get<1>(*it), std::get<2>(*it)); 91 } 92 } 93 94 } // namespace dbus_utils 95 } // namespace brillo 96
