1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "src/traced/probes/ftrace/ftrace_config.h" 18 19 #include "perfetto/base/logging.h" 20 21 namespace perfetto { 22 namespace { 23 24 bool IsGoodFtracePunctuation(char c) { 25 return c == '_' || c == '/' || c == '*'; 26 } 27 28 bool IsGoodAtracePunctuation(char c) { 29 return c == '_' || c == '.' || c == '*'; 30 } 31 32 bool IsValidAtraceEventName(const std::string& str) { 33 for (size_t i = 0; i < str.size(); i++) { 34 if (!isalnum(str[i]) && !IsGoodAtracePunctuation(str[i])) 35 return false; 36 } 37 return true; 38 } 39 40 bool IsValidFtraceEventName(const std::string& str) { 41 int slash_count = 0; 42 for (size_t i = 0; i < str.size(); i++) { 43 if (!isalnum(str[i]) && !IsGoodFtracePunctuation(str[i])) 44 return false; 45 if (str[i] == '/') { 46 slash_count++; 47 // At most one '/' allowed and not at the beginning or end. 48 if (slash_count > 1 || i == 0 || i == str.size() - 1) 49 return false; 50 } 51 if (str[i] == '*' && i != str.size() - 1) 52 return false; 53 } 54 return true; 55 } 56 57 } // namespace 58 59 FtraceConfig CreateFtraceConfig(std::set<std::string> names) { 60 FtraceConfig config; 61 for (const std::string& name : names) 62 *config.add_ftrace_events() = name; 63 return config; 64 } 65 66 bool RequiresAtrace(const FtraceConfig& config) { 67 return !config.atrace_categories().empty() || !config.atrace_apps().empty(); 68 } 69 70 bool ValidConfig(const FtraceConfig& config) { 71 for (const std::string& event_name : config.ftrace_events()) { 72 if (!IsValidFtraceEventName(event_name)) { 73 PERFETTO_ELOG("Bad event name '%s'", event_name.c_str()); 74 return false; 75 } 76 } 77 for (const std::string& category : config.atrace_categories()) { 78 if (!IsValidAtraceEventName(category)) { 79 PERFETTO_ELOG("Bad category name '%s'", category.c_str()); 80 return false; 81 } 82 } 83 for (const std::string& app : config.atrace_apps()) { 84 if (!IsValidAtraceEventName(app)) { 85 PERFETTO_ELOG("Bad app '%s'", app.c_str()); 86 return false; 87 } 88 } 89 return true; 90 } 91 92 } // namespace perfetto 93
