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/*
* Library Internal/Global State
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/libstate.h>
#include <botan/charset.h>
#include <botan/engine.h>
#include <botan/init.h>
#include <botan/internal/defalloc.h>
#include <botan/internal/default_engine.h>
#include <botan/internal/mutex.h>
#include <botan/internal/mux_noop.h>
#include <botan/internal/stl_util.h>
#include <botan/internal/mlock.h>
#include <algorithm>
#if defined(BOTAN_HAS_SELFTESTS)
#include <botan/selftest.h>
#endif
#if defined(BOTAN_HAS_MUTEX_PTHREAD)
#include <botan/internal/mux_pthr.h>
#elif defined(BOTAN_HAS_MUTEX_WIN32)
#include <botan/internal/mux_win32.h>
#elif defined(BOTAN_HAS_MUTEX_QT)
#include <botan/internal/mux_qt.h>
#endif
#if defined(BOTAN_HAS_ALLOC_MMAP)
#include <botan/internal/mmap_mem.h>
#endif
#if defined(BOTAN_HAS_ENGINE_IA32_ASSEMBLER)
#include <botan/internal/ia32_engine.h>
#endif
#if defined(BOTAN_HAS_ENGINE_AMD64_ASSEMBLER)
#include <botan/internal/amd64_engine.h>
#endif
#if defined(BOTAN_HAS_ENGINE_AES_ISA)
#include <botan/internal/aes_isa_engine.h>
#endif
#if defined(BOTAN_HAS_ENGINE_SIMD)
#include <botan/internal/simd_engine.h>
#endif
#if defined(BOTAN_HAS_ENGINE_GNU_MP)
#include <botan/internal/gnump_engine.h>
#endif
#if defined(BOTAN_HAS_ENGINE_OPENSSL)
#include <botan/internal/openssl_engine.h>
#endif
namespace Botan {
/*
* Botan's global state
*/
namespace {
Library_State* global_lib_state = 0;
}
/*
* Access the global state object
*/
Library_State& global_state()
{
/* Lazy initialization. Botan still needs to be deinitialized later
on or memory might leak.
*/
if(!global_lib_state)
LibraryInitializer::initialize("thread_safe=true");
return (*global_lib_state);
}
/*
* Set a new global state object
*/
void set_global_state(Library_State* new_state)
{
delete swap_global_state(new_state);
}
/*
* Swap two global state objects
*/
Library_State* swap_global_state(Library_State* new_state)
{
Library_State* old_state = global_lib_state;
global_lib_state = new_state;
return old_state;
}
/*
* Get a new mutex object
*/
Mutex* Library_State::get_mutex() const
{
return mutex_factory->make();
}
/*
* Get an allocator by its name
*/
Allocator* Library_State::get_allocator(const std::string& type) const
{
Mutex_Holder lock(allocator_lock);
if(type != "")
return search_map<std::string, Allocator*>(alloc_factory, type, 0);
if(!cached_default_allocator)
{
cached_default_allocator =
search_map<std::string, Allocator*>(alloc_factory,
default_allocator_name, 0);
}
return cached_default_allocator;
}
/*
* Create a new name to object mapping
*/
void Library_State::add_allocator(Allocator* allocator)
{
Mutex_Holder lock(allocator_lock);
allocator->init();
allocators.push_back(allocator);
alloc_factory[allocator->type()] = allocator;
}
/*
* Set the default allocator type
*/
void Library_State::set_default_allocator(const std::string& type)
{
Mutex_Holder lock(allocator_lock);
if(type == "")
return;
default_allocator_name = type;
cached_default_allocator = 0;
}
/*
* Get a configuration value
*/
std::string Library_State::get(const std::string& section,
const std::string& key) const
{
Mutex_Holder lock(config_lock);
return search_map<std::string, std::string>(config,
section + "/" + key, "");
}
/*
* See if a particular option has been set
*/
bool Library_State::is_set(const std::string& section,
const std::string& key) const
{
Mutex_Holder lock(config_lock);
return search_map(config, section + "/" + key, false, true);
}
/*
* Set a configuration value
*/
void Library_State::set(const std::string& section, const std::string& key,
const std::string& value, bool overwrite)
{
Mutex_Holder lock(config_lock);
std::string full_key = section + "/" + key;
std::map<std::string, std::string>::const_iterator i =
config.find(full_key);
if(overwrite || i == config.end() || i->second == "")
config[full_key] = value;
}
/*
* Add an alias
*/
void Library_State::add_alias(const std::string& key, const std::string& value)
{
set("alias", key, value);
}
/*
* Dereference an alias to a fixed name
*/
std::string Library_State::deref_alias(const std::string& key) const
{
std::string result = key;
while(is_set("alias", result))
result = get("alias", result);
return result;
}
/*
* Return a reference to the Algorithm_Factory
*/
Algorithm_Factory& Library_State::algorithm_factory() const
{
if(!m_algorithm_factory)
throw Invalid_State("Uninitialized in Library_State::algorithm_factory");
return *m_algorithm_factory;
}
/*
* Return a reference to the global PRNG
*/
RandomNumberGenerator& Library_State::global_rng()
{
Mutex_Holder lock(global_rng_lock);
if(!global_rng_ptr)
global_rng_ptr = make_global_rng(algorithm_factory(),
global_rng_lock);
return *global_rng_ptr;
}
/*
* Load a set of modules
*/
void Library_State::initialize(bool thread_safe)
{
if(mutex_factory)
throw Invalid_State("Library_State has already been initialized");
if(!thread_safe)
{
mutex_factory = new Noop_Mutex_Factory;
}
else
{
#if defined(BOTAN_HAS_MUTEX_PTHREAD)
mutex_factory = new Pthread_Mutex_Factory;
#elif defined(BOTAN_HAS_MUTEX_WIN32)
mutex_factory = new Win32_Mutex_Factory;
#elif defined(BOTAN_HAS_MUTEX_QT)
mutex_factory Qt_Mutex_Factory;
#else
throw Invalid_State("Could not find a thread-safe mutex object to use");
#endif
}
allocator_lock = get_mutex();
config_lock = get_mutex();
global_rng_lock = get_mutex();
default_allocator_name = has_mlock() ? "locking" : "malloc";
add_allocator(new Malloc_Allocator);
add_allocator(new Locking_Allocator(get_mutex()));
#if defined(BOTAN_HAS_ALLOC_MMAP)
add_allocator(new MemoryMapping_Allocator(get_mutex()));
#endif
load_default_config();
m_algorithm_factory = new Algorithm_Factory(*mutex_factory);
#if defined(BOTAN_HAS_ENGINE_GNU_MP)
algorithm_factory().add_engine(new GMP_Engine);
#endif
#if defined(BOTAN_HAS_ENGINE_OPENSSL)
algorithm_factory().add_engine(new OpenSSL_Engine);
#endif
#if defined(BOTAN_HAS_ENGINE_AES_ISA)
algorithm_factory().add_engine(new AES_ISA_Engine);
#endif
#if defined(BOTAN_HAS_ENGINE_SIMD)
algorithm_factory().add_engine(new SIMD_Engine);
#endif
#if defined(BOTAN_HAS_ENGINE_AMD64_ASSEMBLER)
algorithm_factory().add_engine(new AMD64_Assembler_Engine);
#endif
#if defined(BOTAN_HAS_ENGINE_IA32_ASSEMBLER)
algorithm_factory().add_engine(new IA32_Assembler_Engine);
#endif
algorithm_factory().add_engine(new Default_Engine);
#if defined(BOTAN_HAS_SELFTESTS)
confirm_startup_self_tests(algorithm_factory());
#endif
}
/*
* Library_State Constructor
*/
Library_State::Library_State()
{
mutex_factory = 0;
allocator_lock = config_lock = 0;
cached_default_allocator = 0;
m_algorithm_factory = 0;
global_rng_lock = 0;
global_rng_ptr = 0;
}
/*
* Library_State Destructor
*/
Library_State::~Library_State()
{
delete m_algorithm_factory;
delete global_rng_ptr;
cached_default_allocator = 0;
for(u32bit j = 0; j != allocators.size(); ++j)
{
allocators[j]->destroy();
delete allocators[j];
}
delete global_rng_lock;
delete allocator_lock;
delete mutex_factory;
delete config_lock;
}
}
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