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/*
* Dynamically Loaded Object
* (C) 2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/dyn_load.h>
#include <botan/build.h>
#include <botan/exceptn.h>
#if defined(BOTAN_TARGET_OS_HAS_DLOPEN)
#include <dlfcn.h>
#elif defined(BOTAN_TARGET_OS_HAS_LOADLIBRARY)
#include <windows.h>
#endif
namespace Botan {
namespace {
void raise_runtime_loader_exception(const std::string& lib_name,
const char* msg)
{
throw Exception("Failed to load " + lib_name + ": " +
(msg ? msg : "Unknown error"));
}
}
Dynamically_Loaded_Library::Dynamically_Loaded_Library(
const std::string& library) :
m_lib_name(library), m_lib(nullptr)
{
#if defined(BOTAN_TARGET_OS_HAS_DLOPEN)
m_lib = ::dlopen(m_lib_name.c_str(), RTLD_LAZY);
if(!m_lib)
raise_runtime_loader_exception(m_lib_name, dlerror());
#elif defined(BOTAN_TARGET_OS_HAS_LOADLIBRARY)
m_lib = ::LoadLibraryA(m_lib_name.c_str());
if(!m_lib)
raise_runtime_loader_exception(m_lib_name, "LoadLibrary failed");
#endif
if(!m_lib)
raise_runtime_loader_exception(m_lib_name, "Dynamic load not supported");
}
Dynamically_Loaded_Library::~Dynamically_Loaded_Library()
{
#if defined(BOTAN_TARGET_OS_HAS_DLOPEN)
::dlclose(m_lib);
#elif defined(BOTAN_TARGET_OS_HAS_LOADLIBRARY)
::FreeLibrary((HMODULE)m_lib);
#endif
}
void* Dynamically_Loaded_Library::resolve_symbol(const std::string& symbol)
{
void* addr = nullptr;
#if defined(BOTAN_TARGET_OS_HAS_DLOPEN)
addr = ::dlsym(m_lib, symbol.c_str());
#elif defined(BOTAN_TARGET_OS_HAS_LOADLIBRARY)
addr = reinterpret_cast<void*>(::GetProcAddress((HMODULE)m_lib,
symbol.c_str()));
#endif
if(!addr)
throw Exception("Failed to resolve symbol " + symbol +
" in " + m_lib_name);
return addr;
}
}
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