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annotate OrthancFramework/Sources/SharedLibrary.cpp @ 4386:3ea753570c6d

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 18 Dec 2020 12:15:45 +0100
parents c601f48c7c80
children d9473bd5ed43
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "PrecompiledHeaders.h"
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24 #include "SharedLibrary.h"
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25
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26 #include "Logging.h"
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27 #include "OrthancException.h"
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28
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29 #include <boost/filesystem.hpp>
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30
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31 #if defined(_WIN32)
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32 #include <windows.h>
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33 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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34 #include <dlfcn.h>
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35 #else
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36 #error Support your platform here
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37 #endif
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38
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39 namespace Orthanc
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40 {
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41 SharedLibrary::SharedLibrary(const std::string& path) :
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42 path_(path),
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43 handle_(NULL)
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44 {
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45 #if defined(_WIN32)
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46 handle_ = ::LoadLibraryA(path_.c_str());
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47 if (handle_ == NULL)
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48 {
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49 LOG(ERROR) << "LoadLibrary(" << path_ << ") failed: Error " << ::GetLastError();
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50
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51 if (::GetLastError() == ERROR_BAD_EXE_FORMAT &&
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52 sizeof(void*) == 4)
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53 {
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54 throw OrthancException(ErrorCode_SharedLibrary,
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55 "You are most probably trying to load a 64bit plugin into a 32bit version of Orthanc");
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56 }
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57 else if (::GetLastError() == ERROR_BAD_EXE_FORMAT &&
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58 sizeof(void*) == 8)
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59 {
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60 throw OrthancException(ErrorCode_SharedLibrary,
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61 "You are most probably trying to load a 32bit plugin into a 64bit version of Orthanc");
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62 }
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63 else
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64 {
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65 throw OrthancException(ErrorCode_SharedLibrary);
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66 }
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67 }
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68
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69 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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70
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71 /**
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72 * "RTLD_LOCAL" is the default, and is only present to be
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73 * explicit. "RTLD_DEEPBIND" was added in Orthanc 1.6.0, in order
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74 * to avoid crashes while loading plugins from the LSB binaries of
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75 * the Orthanc core.
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76 *
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77 * BUT this had no effect, and this results in a crash if loading
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78 * the Python 2.7 plugin => We disabled it again in Orthanc 1.6.1.
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79 **/
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80
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81 #if 0 // && defined(RTLD_DEEPBIND) // This is a GNU extension
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82 // Disabled in Orthanc 1.6.1
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83 handle_ = ::dlopen(path_.c_str(), RTLD_NOW | RTLD_LOCAL | RTLD_DEEPBIND);
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84 #else
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85 handle_ = ::dlopen(path_.c_str(), RTLD_NOW | RTLD_LOCAL);
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86 #endif
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87
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88 if (handle_ == NULL)
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89 {
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90 std::string explanation;
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91 const char *tmp = ::dlerror();
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92 if (tmp)
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93 {
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94 explanation = ": Error " + std::string(tmp);
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95 }
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96
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97 LOG(ERROR) << "dlopen(" << path_ << ") failed" << explanation;
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98 throw OrthancException(ErrorCode_SharedLibrary);
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99 }
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100
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101 #else
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102 #error Support your platform here
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103 #endif
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104 }
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105
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106 SharedLibrary::~SharedLibrary()
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107 {
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108 if (handle_)
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109 {
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110 #if defined(_WIN32)
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111 ::FreeLibrary((HMODULE)handle_);
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112 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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113 ::dlclose(handle_);
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114 #else
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115 #error Support your platform here
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116 #endif
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117 }
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118 }
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119
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120
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121 const std::string &SharedLibrary::GetPath() const
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122 {
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123 return path_;
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124 }
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125
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126
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127 SharedLibrary::FunctionPointer SharedLibrary::GetFunctionInternal(const std::string& name)
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128 {
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129 if (!handle_)
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130 {
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131 throw OrthancException(ErrorCode_InternalError);
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132 }
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133
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134 #if defined(_WIN32)
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135 return ::GetProcAddress((HMODULE)handle_, name.c_str());
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136 #elif defined(__linux__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD_kernel__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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137 return ::dlsym(handle_, name.c_str());
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138 #else
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139 #error Support your platform here
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140 #endif
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141 }
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142
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143
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144 SharedLibrary::FunctionPointer SharedLibrary::GetFunction(const std::string& name)
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145 {
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146 SharedLibrary::FunctionPointer result = GetFunctionInternal(name);
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147
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148 if (result == NULL)
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149 {
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150 throw OrthancException(
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151 ErrorCode_SharedLibrary,
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152 "Shared library does not expose function \"" + name + "\"");
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153 }
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154 else
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155 {
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156 return result;
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157 }
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158 }
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159
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160
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161 bool SharedLibrary::HasFunction(const std::string& name)
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162 {
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163 return GetFunctionInternal(name) != NULL;
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164 }
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165 }