mirror of
https://github.com/matrix-construct/construct
synced 2024-11-20 17:01:55 +01:00
701 lines
15 KiB
C++
701 lines
15 KiB
C++
/*
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* ircd-ratbox: A slightly useful ircd.
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* modules.c: A module loader.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk <jason@zemos.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include <boost/filesystem.hpp>
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#include <boost/dll.hpp>
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namespace filesystem = boost::filesystem;
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namespace load_mode = boost::dll::load_mode;
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#include <ircd/mapi.h> // Module's internal API
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namespace ircd {
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namespace mods {
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struct mod
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:std::enable_shared_from_this<mod>
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{
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static std::map<std::string, mod *> loaded;
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boost::dll::shared_library handle;
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mapi::header *header;
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// Metadata
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auto &operator[](const std::string &s) const { return header->meta.operator[](s); }
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auto &operator[](const std::string &s) { return header->meta.operator[](s); }
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auto name() const { return handle.location().filename().string(); }
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auto location() const { return handle.location().string(); }
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auto &version() const { return header->version; }
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auto &description() const { return (*this)["description"]; }
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bool has(const std::string &name) const;
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template<class T> const T &get(const std::string &name) const;
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template<class T> T &get(const std::string &name);
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template<class T = uint8_t> const T *ptr(const std::string &name) const;
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template<class T = uint8_t> T *ptr(const std::string &name);
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mod(const filesystem::path &,
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const load_mode::type & = load_mode::rtld_local | load_mode::rtld_now);
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~mod() noexcept;
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};
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filesystem::path prefix_if_relative(const filesystem::path &path);
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filesystem::path postfixed(const filesystem::path &path);
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std::string postfixed(const std::string &name);
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template<class R, class F> R info(const filesystem::path &, F&& closure);
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std::vector<std::string> sections(const filesystem::path &path);
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std::vector<std::string> symbols(const filesystem::path &path);
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std::vector<std::string> symbols(const filesystem::path &path, const std::string §ion);
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// Get the full path of a [valid] available module by name
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filesystem::path fullpath(const std::string &name);
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// Checks if loadable module containing a mapi header (does not verify the magic)
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bool is_module(const filesystem::path &);
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bool is_module(const filesystem::path &, std::string &why);
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bool is_module(const filesystem::path &, std::nothrow_t);
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bool is_module(const std::string &fullpath, std::string &why);
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bool is_module(const std::string &fullpath, std::nothrow_t);
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bool is_module(const std::string &fullpath);
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struct log::log log
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{
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"modules", 'M'
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};
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} // namespace mods
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} // namespace ircd
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ircd::mods::init::init()
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{
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}
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ircd::mods::init::~init()
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noexcept
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{
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// module
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//
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namespace ircd {
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namespace mods {
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} // namespace mods
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} // namespace ircd
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ircd::mods::module::module(const std::string &name)
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try
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:std::shared_ptr<mod>{[&name]
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{
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const auto path(fullpath(name));
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const auto filename(postfixed(name));
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// Search for loaded module and increment the reference counter for this handle if loaded.
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auto it(mod::loaded.find(filename));
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if(it != end(mod::loaded))
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{
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auto &mod(*it->second);
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return shared_from(mod);
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}
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static const load_mode::type flags
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{
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load_mode::rtld_local |
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load_mode::rtld_now
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};
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log.debug("Attempting to load '%s' @ `%s'",
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filename.c_str(),
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path.string().c_str());
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return std::make_shared<mod>(path, flags);
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}()}
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{
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}
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catch(const std::exception &e)
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{
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log.error("Failed to load '%s': %s",
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name.c_str(),
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e.what());
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throw;
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}
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ircd::mods::module::~module()
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noexcept
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{
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}
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std::string
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ircd::mods::module::path()
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const
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{
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if(unlikely(!*this))
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return std::string{};
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auto &mod(**this);
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return mod.location();
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}
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std::string
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ircd::mods::module::name()
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const
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{
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if(unlikely(!*this))
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return std::string{};
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auto &mod(**this);
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return mod.name();
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}
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template<> uint8_t *
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ircd::mods::module::ptr<uint8_t>(const std::string &name)
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{
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const auto &mod(**this);
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return &mod.handle.get<uint8_t>(name);
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}
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template<>
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const uint8_t *
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ircd::mods::module::ptr<const uint8_t>(const std::string &name)
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const
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{
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const auto &mod(**this);
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return &mod.handle.get<const uint8_t>(name);
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}
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bool
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ircd::mods::module::has(const std::string &name)
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const
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{
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if(unlikely(!*this))
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return false;
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const auto &mod(**this);
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return mod.handle.has(name);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// misc
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//
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namespace ircd {
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namespace mods {
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} // namespace mods
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} // namespace ircd
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bool
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ircd::mods::loaded(const std::string &name)
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{
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return mod::loaded.count(postfixed(name));
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}
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bool
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ircd::mods::available(const std::string &name)
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{
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using filesystem::path;
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std::vector<std::string> why;
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return !search(name, why).empty();
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}
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std::string
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ircd::mods::search(const std::string &name)
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{
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std::vector<std::string> why;
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return search(name, why);
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}
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std::vector<std::string>
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ircd::mods::find_symbol(const std::string &symbol)
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{
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std::vector<std::string> ret;
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const auto av(available());
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std::copy_if(begin(av), end(av), std::back_inserter(ret), [&symbol]
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(const auto &name)
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{
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return has_symbol(name, symbol);
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});
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return ret;
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}
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bool
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ircd::mods::has_symbol(const std::string &name,
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const std::string &symbol)
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{
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const auto fullpath(search(name));
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if(fullpath.empty())
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return false;
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const auto syms(symbols(fullpath));
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return std::find(begin(syms), end(syms), symbol) != end(syms);
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}
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filesystem::path
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ircd::mods::fullpath(const std::string &name)
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{
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std::vector<std::string> why;
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const filesystem::path path(search(name, why));
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if(path.empty())
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{
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for(const auto &str : why)
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log.error("candidate for module '%s' failed: %s",
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name.c_str(),
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str.c_str());
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throw error("No valid module by name `%s'", name.c_str());
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}
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return path;
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}
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std::string
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ircd::mods::search(const std::string &name,
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std::vector<std::string> &why)
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{
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using filesystem::path;
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const path path(postfixed(name));
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if(!path.is_relative())
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{
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why.resize(why.size() + 1);
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return is_module(path, why.back())? name : std::string{};
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}
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else for(const auto &dir : paths)
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{
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why.resize(why.size() + 1);
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if(is_module(dir/path, why.back()))
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return (dir/path).string();
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}
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return {};
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}
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std::forward_list<std::string>
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ircd::mods::available()
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{
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using filesystem::path;
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using filesystem::directory_iterator;
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std::forward_list<std::string> ret;
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for(const auto &dir : paths) try
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{
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for(directory_iterator it(dir); it != directory_iterator(); ++it)
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if(is_module(it->path(), std::nothrow))
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ret.emplace_front(relative(it->path(), dir).string());
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}
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catch(const filesystem::filesystem_error &e)
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{
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log.warning("Module path [%s]: %s",
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dir.c_str(),
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e.what());
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continue;
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}
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return ret;
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}
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bool
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ircd::mods::is_module(const std::string &fullpath)
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{
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return is_module(filesystem::path(fullpath));
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}
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bool
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ircd::mods::is_module(const std::string &fullpath,
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std::nothrow_t)
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{
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return is_module(filesystem::path(fullpath), std::nothrow);
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}
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bool
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ircd::mods::is_module(const std::string &fullpath,
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std::string &why)
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{
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return is_module(filesystem::path(fullpath), why);
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}
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bool
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ircd::mods::is_module(const filesystem::path &path,
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std::nothrow_t)
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try
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{
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return is_module(path);
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}
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catch(const std::exception &e)
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{
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return false;
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}
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bool
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ircd::mods::is_module(const filesystem::path &path,
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std::string &why)
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try
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{
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return is_module(path);
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}
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catch(const std::exception &e)
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{
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why = e.what();
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return false;
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}
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bool
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ircd::mods::is_module(const filesystem::path &path)
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{
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if(!exists(path))
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throw filesystem_error("`%s' does not exist",
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path.string().c_str());
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if(!is_regular_file(path))
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throw filesystem_error("`%s' is not a file",
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path.string().c_str());
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const auto syms(symbols(path));
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const auto &header_name(mapi::header_symbol_name);
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const auto it(std::find(begin(syms), end(syms), header_name));
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if(it == end(syms))
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throw error("`%s': has no MAPI header (%s)",
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path.string().c_str(),
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header_name);
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return true;
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}
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std::vector<std::string>
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ircd::mods::sections(const std::string &fullpath)
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{
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return sections(filesystem::path(fullpath));
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}
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std::vector<std::string>
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ircd::mods::symbols(const std::string &fullpath)
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{
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return symbols(filesystem::path(fullpath));
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}
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std::vector<std::string>
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ircd::mods::symbols(const std::string &fullpath,
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const std::string §ion)
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{
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return symbols(filesystem::path(fullpath), section);
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}
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std::vector<std::string>
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ircd::mods::sections(const filesystem::path &path)
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{
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return info<std::vector<std::string>>(path, []
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(boost::dll::library_info &info)
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{
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return info.sections();
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});
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}
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std::vector<std::string>
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ircd::mods::symbols(const filesystem::path &path)
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{
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return info<std::vector<std::string>>(path, []
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(boost::dll::library_info &info)
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{
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return info.symbols();
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});
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}
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std::vector<std::string>
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ircd::mods::symbols(const filesystem::path &path,
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const std::string §ion)
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{
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return info<std::vector<std::string>>(path, [§ion]
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(boost::dll::library_info &info)
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{
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return info.symbols(section);
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});
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}
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template<class R,
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class F>
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R
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ircd::mods::info(const filesystem::path &path,
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F&& closure)
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{
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if(!exists(path))
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throw filesystem_error("`%s' does not exist",
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path.string().c_str());
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if(!is_regular_file(path))
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throw filesystem_error("`%s' is not a file",
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path.string().c_str());
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boost::dll::library_info info(path);
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return closure(info);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// paths
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//
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namespace ircd {
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namespace mods {
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const filesystem::path modroot
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{
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ircd::path::get(ircd::path::MODULES)
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};
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struct paths paths;
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} // namespace mods
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} // namespace ircd
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ircd::mods::paths::paths()
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:std::vector<std::string>
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{{
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modroot.string()
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}}
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{
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}
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bool
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ircd::mods::paths::add(const std::string &dir)
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{
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using filesystem::path;
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const path path(prefix_if_relative(dir));
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if(!exists(path))
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throw filesystem_error("path `%s' (%s) does not exist",
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dir.c_str(),
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path.string().c_str());
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if(!is_directory(path))
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throw filesystem_error("path `%s' (%s) is not a directory",
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dir.c_str(),
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path.string().c_str());
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if(added(dir))
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return false;
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emplace(begin(), dir);
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return true;
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}
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bool
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ircd::mods::paths::add(const std::string &dir,
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std::nothrow_t)
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try
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{
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return add(dir);
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}
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catch(const std::exception &e)
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{
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log.error("Failed to add path: %s", e.what());
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return false;
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}
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bool
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ircd::mods::paths::del(const std::string &dir)
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{
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std::remove(begin(), end(), prefix_if_relative(dir).string());
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return true;
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}
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bool
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ircd::mods::paths::added(const std::string &dir)
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const
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{
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return std::find(begin(), end(), dir) != end();
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}
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std::string
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ircd::mods::postfixed(const std::string &name)
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{
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return postfixed(filesystem::path(name)).string();
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}
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filesystem::path
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ircd::mods::postfixed(const filesystem::path &path)
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{
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static const auto suffix(boost::dll::shared_library::suffix());
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if(extension(path) == suffix)
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return path;
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filesystem::path ret(path);
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return ret += suffix;
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}
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filesystem::path
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ircd::mods::prefix_if_relative(const filesystem::path &path)
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{
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return path.is_relative()? (modroot / path) : path;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// mod (internal)
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//
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namespace ircd {
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namespace mods {
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std::map<std::string, mod *> mod::loaded;
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} // namespace mods
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} // namespace ircd
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ircd::mods::mod::mod(const filesystem::path &path,
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const load_mode::type &type)
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try
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:handle
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{
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path, type
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}
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,header
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{
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&handle.get<mapi::header>(mapi::header_symbol_name)
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}
|
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{
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log.debug("Loaded static segment of '%s' @ `%s'",
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name().c_str(),
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path.string().c_str());
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if(unlikely(!header))
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|
throw error("Unexpected null header");
|
|
|
|
if(header->magic != mapi::MAGIC)
|
|
throw error("Bad magic [%04x] need: [%04x]",
|
|
header->magic,
|
|
mapi::MAGIC);
|
|
|
|
// Set some basic metadata
|
|
auto &meta(header->meta);
|
|
meta["name"] = name();
|
|
meta["location"] = location();
|
|
|
|
// If init throws an exception from here the loading process will back out.
|
|
if(header->init)
|
|
header->init();
|
|
|
|
// Without init exception, the module is now considered loaded.
|
|
loaded.emplace(name(), this);
|
|
log.info("Loaded module %s v%u \"%s\"",
|
|
name().c_str(),
|
|
header->version,
|
|
description().size()? description().c_str() : "<no description>");
|
|
}
|
|
catch(const boost::system::system_error &e)
|
|
{
|
|
throw error("%s", e.what());
|
|
}
|
|
|
|
// Allows module to communicate static destruction is taking place when mapi::header
|
|
// destructs. If dlclose() returns without this being set, dlclose() lied about really
|
|
// unloading the module. That is considered a "stuck" module.
|
|
bool ircd::mapi::static_destruction;
|
|
|
|
ircd::mods::mod::~mod()
|
|
noexcept try
|
|
{
|
|
const auto name(this->name());
|
|
log.debug("Attempting unload module '%s' @ `%s'",
|
|
name.c_str(),
|
|
location().c_str());
|
|
|
|
const size_t erased(loaded.erase(name));
|
|
assert(erased == 1);
|
|
|
|
if(header->fini)
|
|
header->fini();
|
|
|
|
log.debug("Attempting static unload for '%s' @ `%s'",
|
|
name.c_str(),
|
|
location().c_str());
|
|
|
|
mapi::static_destruction = false;
|
|
handle.unload();
|
|
assert(!handle.is_loaded());
|
|
if(!mapi::static_destruction)
|
|
{
|
|
log.error("Module \"%s\" is stuck and failing to unload.", name.c_str());
|
|
log.warning("Module \"%s\" may result in undefined behavior if not fixed.", name.c_str());
|
|
} else {
|
|
log.info("Unloaded '%s'", name.c_str());
|
|
}
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::critical("Module @%p unload: %s",
|
|
(const void *)this,
|
|
e.what());
|
|
|
|
if(!ircd::debugmode)
|
|
return;
|
|
}
|
|
|
|
template<class T>
|
|
T *
|
|
ircd::mods::mod::ptr(const std::string &name)
|
|
{
|
|
return &handle.get<T>(name);
|
|
}
|
|
|
|
template<class T>
|
|
const T *
|
|
ircd::mods::mod::ptr(const std::string &name)
|
|
const
|
|
{
|
|
return &handle.get<T>(name);
|
|
}
|
|
|
|
template<class T>
|
|
T &
|
|
ircd::mods::mod::get(const std::string &name)
|
|
{
|
|
handle.get<T>(name);
|
|
}
|
|
|
|
template<class T>
|
|
const T &
|
|
ircd::mods::mod::get(const std::string &name)
|
|
const
|
|
{
|
|
handle.get<T>(name);
|
|
}
|
|
|
|
bool
|
|
ircd::mods::mod::has(const std::string &name)
|
|
const
|
|
{
|
|
return handle.has(name);
|
|
}
|