1 /* 2 * Copyright 2018 Google Inc. 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 "utils.hpp" 18 19 #include "fs.hpp" 20 #include "manager.hpp" 21 22 #include <dlfcn.h> 23 24 #include <phosphor-logging/log.hpp> 25 26 #include <memory> 27 #include <regex> 28 #include <string> 29 #include <unordered_set> 30 #include <vector> 31 32 namespace blobs 33 { 34 35 using namespace phosphor::logging; 36 37 bool matchBlobHandler(const std::string& filename) 38 { 39 return filename.find(".so") != std::string::npos; 40 } 41 42 void loadLibraries(ManagerInterface* manager, const std::string& path, 43 const internal::DlSysInterface* sys) 44 { 45 std::unordered_set<HandlerFactory> seen; 46 void* libHandle = NULL; 47 HandlerFactory factory; 48 49 std::vector<std::string> libs = getLibraryList(path, matchBlobHandler); 50 51 for (const auto& p : libs) 52 { 53 libHandle = sys->dlopen(p.c_str(), RTLD_NOW | RTLD_GLOBAL); 54 if (!libHandle) 55 { 56 log<level::ERR>("ERROR opening", entry("HANDLER=%s", p.c_str()), 57 entry("ERROR=%s", sys->dlerror())); 58 continue; 59 } 60 61 sys->dlerror(); /* Clear any previous error. */ 62 63 factory = reinterpret_cast<HandlerFactory>( 64 sys->dlsym(libHandle, "createHandler")); 65 66 const char* error = sys->dlerror(); 67 if (error) 68 { 69 log<level::ERR>("ERROR loading symbol", 70 entry("HANDLER=%s", p.c_str()), 71 entry("ERROR=%s", error)); 72 continue; 73 } 74 75 // We may have duplicate libraries in the blobs directory that we only 76 // want to initialize once. 77 if (seen.count(factory) > 0) 78 { 79 continue; 80 } 81 seen.emplace(factory); 82 83 try 84 { 85 std::unique_ptr<GenericBlobInterface> result = factory(); 86 if (!result) 87 { 88 log<level::ERR>("Unable to create handler", 89 entry("HANDLER=%s", p.c_str())); 90 continue; 91 } 92 93 manager->registerHandler(std::move(result)); 94 } 95 catch (const std::exception& e) 96 { 97 log<level::ERR>("Received exception loading handler", 98 entry("HANDLER=%s", p.c_str()), 99 entry("EXCEPTION=%s", e.what())); 100 } 101 } 102 } 103 104 } // namespace blobs 105