p11_module.cpp

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/*
* PKCS#11 Module
* (C) 2016 Daniel Neus, Sirrix AG
* (C) 2016 Philipp Weber, Sirrix AG
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#include <botan/p11_types.h>
 
#include <botan/internal/dyn_load.h>
 
namespace Botan::PKCS11 {
 
Module::Module(std::string_view file_path, C_InitializeArgs init_args) : m_file_path(file_path) {
   if(file_path.empty()) {
      throw Invalid_Argument("PKCS11 no module path specified");
   }
   reload(init_args);
}
 
Module::Module(Module&& other) noexcept = default;
 
Module::~Module() noexcept {
   try {
      if(m_low_level) {
         m_low_level->C_Finalize(nullptr, nullptr);
      }
   } catch(...) {
      // we are noexcept and must swallow any exception here
   }
}
 
void Module::reload(C_InitializeArgs init_args) {
   // Build the new library + LowLevel in locals so library load and interface
   // discovery failures leave m_library / m_low_level untouched.
   auto new_library = std::make_unique<Dynamically_Loaded_Library>(m_file_path);
   auto new_low_level = std::make_unique<LowLevel>(InterfaceWrapper::latest_p11_interface(*new_library));
 
   // m_file_path is const, so dlopen typically returns the same handle as the
   // old module and PKCS#11 state is shared; we must finalize before
   // re-initializing. Clear the old members up front so a C_Initialize failure
   // below leaves the Module empty rather than holding a function table for an
   // already-finalized library.
   if(m_low_level) {
      m_low_level->C_Finalize(nullptr);
   }
   m_low_level.reset();
   m_library.reset();
 
   new_low_level->C_Initialize(&init_args);
 
   m_low_level = std::move(new_low_level);
   m_library = std::move(new_library);
}
 
}  // namespace Botan::PKCS11