735 lines
24 KiB
C++
735 lines
24 KiB
C++
// This file Copyright © 2007-2023 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <algorithm>
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#include <array>
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#include <cerrno> // for EINVAL
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#include <string>
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#include <string_view>
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#include <vector>
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#include <fmt/core.h>
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#include <fmt/format.h>
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#include "transmission.h"
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#include "benc.h"
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#include "crypto-utils.h"
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#include "error-types.h"
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#include "error.h"
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#include "file.h"
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#include "log.h"
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#include "quark.h"
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#include "torrent-metainfo.h"
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#include "tr-assert.h"
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#include "tr-strbuf.h"
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#include "utils.h"
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#include "web-utils.h"
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using namespace std::literals;
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/**
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* @brief Ensure that the URLs for multfile torrents end in a slash.
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*
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* See http://bittorrent.org/beps/bep_0019.html#metadata-extension
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* for background on how the trailing slash is used for "url-list"
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* fields.
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*
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* This function is to workaround some .torrent generators, such as
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* mktorrent and very old versions of utorrent, that don't add the
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* trailing slash for multifile torrents if omitted by the end user.
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*/
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std::string tr_torrent_metainfo::fixWebseedUrl(tr_torrent_metainfo const& tm, std::string_view url)
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{
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url = tr_strvStrip(url);
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if (tm.fileCount() > 1U && !std::empty(url) && url.back() != '/')
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{
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return std::string{ url } + '/';
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}
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return std::string{ url };
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}
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namespace
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{
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auto constexpr MaxBencDepth = 32;
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bool tr_error_is_set(tr_error const* const* error)
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{
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return (error != nullptr) && (*error != nullptr);
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}
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} // namespace
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struct MetainfoHandler final : public transmission::benc::BasicHandler<MaxBencDepth>
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{
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using BasicHandler = transmission::benc::BasicHandler<MaxBencDepth>;
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tr_torrent_metainfo& tm_;
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int64_t piece_size_ = 0;
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int64_t length_ = 0;
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std::string encoding_ = "UTF-8";
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std::string_view info_dict_begin_;
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tr_tracker_tier_t tier_ = 0;
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tr_pathbuf file_subpath_;
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std::string_view pieces_root_;
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int64_t file_length_ = 0;
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enum class State
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{
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UsePath,
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FileTree,
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Files,
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FilesIgnored,
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PieceLayers,
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};
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State state_ = State::UsePath;
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explicit MetainfoHandler(tr_torrent_metainfo& tm)
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: tm_{ tm }
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{
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}
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bool Key(std::string_view key, Context const& context) override
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{
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return BasicHandler::Key(key, context);
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}
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bool StartDict(Context const& context) override
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{
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if (state_ == State::FileTree)
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{
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if (!std::empty(file_subpath_))
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{
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file_subpath_ += '/';
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}
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tr_torrent_files::makeSubpathPortable(currentKey(), file_subpath_);
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}
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else if (pathIs(InfoKey))
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{
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info_dict_begin_ = context.raw();
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tm_.info_dict_offset_ = context.tokenSpan().first;
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}
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else if (pathIs(InfoKey, FileTreeKey))
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{
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state_ = State::FileTree;
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file_subpath_.clear();
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file_length_ = 0;
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}
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else if (pathIs(PieceLayersKey))
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{
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state_ = State::PieceLayers;
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}
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return BasicHandler::StartDict(context);
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}
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bool EndDict(Context const& context) override
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{
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BasicHandler::EndDict(context);
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if (pathIs(InfoKey))
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{
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return finishInfoDict(context);
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}
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if (depth() == 0) // top
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{
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return finish(context);
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}
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if (state_ == State::FileTree) // bittorrent v2 format
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{
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// v2, ignore for today
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tr_logAddInfo("'file tree' is ignored");
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state_ = State::UsePath;
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}
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else if (state_ == State::Files) // bittorrent v1 format
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{
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if (!addFile(context))
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{
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return false;
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}
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file_subpath_.clear();
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}
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else if (state_ == State::PieceLayers)
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{
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state_ = State::UsePath;
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}
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return depth() > 0;
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}
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bool StartArray(Context const& context) override
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{
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if (pathIs(InfoKey, FilesKey))
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{
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state_ = std::empty(tm_.files_) ? State::Files : State::FilesIgnored;
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file_subpath_.clear();
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file_length_ = 0;
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}
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else if (pathStartsWith(InfoKey, FilesKey, ""sv, PathUtf8Key))
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{
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// torrent has a utf8 path, drop the other one due to probable non-utf8 encoding
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file_subpath_.clear();
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}
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return BasicHandler::StartArray(context);
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}
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bool EndArray(Context const& context) override
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{
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BasicHandler::EndArray(context);
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if ((state_ == State::Files || state_ == State::FilesIgnored) && currentKey() == FilesKey) // bittorrent v1 format
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{
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state_ = State::UsePath;
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return true;
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}
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if (depth() == 2 && key(1) == AnnounceListKey)
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{
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++tier_;
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}
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return true;
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}
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bool Int64(int64_t value, Context const& /*context*/) override
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{
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auto unhandled = bool{ false };
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if (state_ == State::FilesIgnored)
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{
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// no-op
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}
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else if (state_ == State::FileTree || state_ == State::Files)
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{
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if (currentKey() == LengthKey)
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{
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file_length_ = value;
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}
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else if (pathIs(InfoKey, FilesKey, ""sv, MtimeKey))
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{
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// unused by Transmission
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}
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else
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{
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unhandled = true;
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}
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}
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else if (pathIs(CreationDateKey) || pathIs(InfoKey, CreationDateKey))
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{
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tm_.date_created_ = value;
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}
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else if (pathIs(PrivateKey) || pathIs(InfoKey, PrivateKey))
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{
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tm_.is_private_ = value != 0;
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}
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else if (pathIs(PieceLengthKey) || pathIs(InfoKey, PieceLengthKey))
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{
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piece_size_ = value;
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}
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else if (pathIs(InfoKey, LengthKey))
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{
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length_ = value;
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}
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else if (pathIs(InfoKey, MetaVersionKey))
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{
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// currently unused. TODO support for bittorrent v2
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// TODO https://github.com/transmission/transmission/issues/458
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tm_.is_v2_ = value == 2;
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}
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else if (
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pathIs(DurationKey) || //
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pathIs(EncodedRateKey) || //
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pathIs(HeightKey) || //
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pathIs(InfoKey, EntropyKey) || //
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pathIs(InfoKey, UniqueKey) || //
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pathIs(ProfilesKey, HeightKey) || //
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pathIs(ProfilesKey, WidthKey) || //
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pathIs(WidthKey) || //
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pathStartsWith(AzureusPropertiesKey) || //
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pathStartsWith(InfoKey, FileDurationKey) || //
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pathStartsWith(InfoKey, FileMediaKey) || //
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pathStartsWith(InfoKey, ProfilesKey) || //
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pathStartsWith(LibtorrentResumeKey) || //
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pathStartsWith(NodesKey))
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{
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// unused by Transmission
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}
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else
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{
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unhandled = true;
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}
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if (unhandled)
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{
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tr_logAddWarn(fmt::format("unexpected: path '{}', int '{}'", path(), value));
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}
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return true;
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}
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bool String(std::string_view value, Context const& context) override
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{
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auto const curdepth = depth();
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auto const current_key = currentKey();
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auto unhandled = bool{ false };
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if (state_ == State::FilesIgnored)
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{
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// no-op
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}
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else if (state_ == State::FileTree)
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{
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if (current_key == AttrKey || current_key == PiecesRootKey)
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{
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// currently unused. TODO support for bittorrent v2
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// TODO https://github.com/transmission/transmission/issues/458
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}
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else
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{
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unhandled = true;
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}
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}
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else if (state_ == State::Files)
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{
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if (curdepth > 1 && (key(curdepth - 1) == PathKey || key(curdepth - 1) == PathUtf8Key))
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{
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if (!std::empty(file_subpath_))
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{
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file_subpath_ += '/';
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}
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tr_torrent_files::makeSubpathPortable(value, file_subpath_);
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}
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else if (current_key == AttrKey)
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{
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// currently unused. TODO support for bittorrent v2
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// TODO https://github.com/transmission/transmission/issues/458
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}
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else if (
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pathIs(InfoKey, FilesKey, ""sv, Crc32Key) || //
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pathIs(InfoKey, FilesKey, ""sv, Ed2kKey) || //
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pathIs(InfoKey, FilesKey, ""sv, FilehashKey) || //
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pathIs(InfoKey, FilesKey, ""sv, Md5Key) || //
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pathIs(InfoKey, FilesKey, ""sv, Md5sumKey) || //
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pathIs(InfoKey, FilesKey, ""sv, MtimeKey) || // (why a string?)
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pathIs(InfoKey, FilesKey, ""sv, Sha1Key))
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{
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// unused by Transmission
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}
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else
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{
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unhandled = true;
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}
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}
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else if (pathIs(CommentKey) || pathIs(CommentUtf8Key))
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{
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tm_.comment_ = tr_strv_convert_utf8(value);
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}
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else if (pathIs(CreatedByKey) || pathIs(CreatedByUtf8Key))
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{
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tm_.creator_ = tr_strv_convert_utf8(value);
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}
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else if (
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pathIs(SourceKey) || pathIs(InfoKey, SourceKey) || //
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pathIs(PublisherKey) || pathIs(InfoKey, PublisherKey) || //
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pathIs(PublisherUtf8Key) || pathIs(InfoKey, PublisherUtf8Key))
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{
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// “publisher” is rare, but used by BitComet and appears
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// to have the same use as the 'source' key
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// http://wiki.bitcomet.com/inside_bitcomet
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tm_.source_ = tr_strv_convert_utf8(value);
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}
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else if (pathIs(AnnounceKey))
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{
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tm_.announceList().add(value, tier_);
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}
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else if (pathIs(EncodingKey))
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{
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encoding_ = tr_strvStrip(value);
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}
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else if (pathIs(UrlListKey))
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{
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tm_.addWebseed(value);
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}
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else if (pathIs(InfoKey, NameKey) || pathIs(InfoKey, NameUtf8Key))
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{
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tm_.setName(value);
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}
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else if (pathIs(InfoKey, PiecesKey))
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{
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if (std::size(value) % sizeof(tr_sha1_digest_t) == 0)
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{
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auto const n = std::size(value) / sizeof(tr_sha1_digest_t);
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tm_.pieces_.resize(n);
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std::copy_n(std::data(value), std::size(value), reinterpret_cast<char*>(std::data(tm_.pieces_)));
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tm_.pieces_offset_ = context.tokenSpan().first;
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}
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else
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{
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tr_error_set(context.error, EINVAL, fmt::format("invalid piece size: {}", std::size(value)));
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unhandled = true;
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}
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}
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else if (pathStartsWith(PieceLayersKey))
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{
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// currently unused. TODO support for bittorrent v2
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// TODO https://github.com/transmission/transmission/issues/458
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}
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else if (pathStartsWith(AnnounceListKey))
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{
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tm_.announceList().add(value, tier_);
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}
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else if (curdepth == 2 && (pathStartsWith(HttpSeedsKey) || pathStartsWith(UrlListKey)))
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{
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tm_.addWebseed(value);
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}
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else if (pathIs(MagnetInfoKey, DisplayNameKey))
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{
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// compatibility with Transmission <= 3.0
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tm_.setName(value);
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}
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else if (pathIs(MagnetInfoKey, InfoHashKey))
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{
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// compatibility with Transmission <= 3.0
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if (value.length() == sizeof(tr_sha1_digest_t))
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{
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std::copy_n(std::data(value), sizeof(tr_sha1_digest_t), reinterpret_cast<char*>(std::data(tm_.info_hash_)));
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tm_.info_hash_str_ = tr_sha1_to_string(tm_.info_hash_);
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tm_.has_magnet_info_hash_ = true;
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}
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}
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else if (
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pathIs(ChecksumKey) || //
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pathIs(ErrCallbackKey) || //
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pathIs(InfoKey, Ed2kKey) || //
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pathIs(InfoKey, EntropyKey) || //
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pathIs(InfoKey, Md5sumKey) || //
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pathIs(InfoKey, PublisherUrlKey) || //
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pathIs(InfoKey, PublisherUrlUtf8Key) || //
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pathIs(InfoKey, Sha1Key) || //
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pathIs(InfoKey, UniqueKey) || //
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pathIs(InfoKey, XCrossSeedKey) || //
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pathIs(LocaleKey) || //
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pathIs(LogCallbackKey) || //
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pathIs(PublisherUrlKey) || //
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pathIs(PublisherUrlUtf8Key) || //
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pathIs(TitleKey) || //
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pathStartsWith(AzureusPrivatePropertiesKey) || //
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pathStartsWith(AzureusPropertiesKey) || //
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pathStartsWith(InfoKey, CollectionsKey) || //
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pathStartsWith(InfoKey, FileDurationKey) || //
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pathStartsWith(InfoKey, ProfilesKey) || //
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pathStartsWith(LibtorrentResumeKey) || //
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pathStartsWith(MagnetInfoKey) || //
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pathStartsWith(NodesKey))
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{
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// unused by Transmission
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}
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else
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{
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unhandled = true;
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}
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if (unhandled)
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{
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tr_logAddWarn(fmt::format("unexpected: path '{}', str '{}'", path(), value));
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}
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return true;
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}
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private:
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template<typename... Args>
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[[nodiscard]] bool pathStartsWith(Args... args) const noexcept
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{
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auto i = 1U;
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return (depth() >= sizeof...(args)) && ((key(i++) == args) && ...);
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}
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template<typename... Args>
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[[nodiscard]] bool pathIs(Args... args) const noexcept
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{
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auto i = 1U;
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return (depth() == sizeof...(args)) && ((key(i++) == args) && ...);
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}
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[[nodiscard]] bool addFile(Context const& context)
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{
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bool ok = true;
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if (file_length_ == 0)
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{
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return ok;
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}
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// FIXME: Check to see if we already added this file. This is a safeguard
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// for hybrid torrents with duplicate info between "file tree" and "files"
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if (std::empty(file_subpath_))
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{
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tr_error_set(context.error, EINVAL, fmt::format("invalid path [{:s}]", file_subpath_));
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ok = false;
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}
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else
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{
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tm_.files_.add(file_subpath_, file_length_);
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}
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file_length_ = 0;
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pieces_root_ = {};
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// NB: let caller decide how to clear file_tree_.
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// if we're in "files" mode we clear it; if in "file tree" we pop it
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return ok;
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}
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bool finishInfoDict(Context const& context)
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{
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if (std::empty(info_dict_begin_))
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{
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tr_error_set(context.error, EINVAL, "no info_dict found");
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return false;
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}
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auto root = tr_pathbuf{};
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tr_torrent_files::makeSubpathPortable(tm_.name_, root);
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if (!std::empty(root))
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{
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tm_.files_.insertSubpathPrefix(root);
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}
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TR_ASSERT(info_dict_begin_[0] == 'd');
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TR_ASSERT(context.raw().back() == 'e');
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char const* const begin = &info_dict_begin_.front();
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char const* const end = &context.raw().back() + 1;
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auto const info_dict_benc = std::string_view{ begin, size_t(end - begin) };
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auto const hash = tr_sha1::digest(info_dict_benc);
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auto const hash2 = tr_sha256::digest(info_dict_benc);
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tm_.info_hash_ = hash;
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tm_.info_hash_str_ = tr_sha1_to_string(tm_.info_hash_);
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tm_.info_hash2_ = hash2;
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tm_.info_hash2_str_ = tr_sha256_to_string(tm_.info_hash2_);
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tm_.info_dict_size_ = std::size(info_dict_benc);
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return true;
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}
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bool finish(Context const& context)
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{
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// bittorrent 1.0 spec
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// http://bittorrent.org/beps/bep_0003.html
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//
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// "There is also a key length or a key files, but not both or neither.
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//
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// "If length is present then the download represents a single file,
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// otherwise it represents a set of files which go in a directory structure.
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// In the single file case, length maps to the length of the file in bytes.
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if (tm_.fileCount() == 0 && length_ != 0 && !std::empty(tm_.name_))
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{
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tm_.files_.add(tm_.name_, length_);
|
|
}
|
|
|
|
if (auto const has_metainfo = tm_.infoDictSize() != 0U; has_metainfo)
|
|
{
|
|
// do some sanity checks to make sure the torrent looks sane
|
|
if (tm_.fileCount() == 0)
|
|
{
|
|
if (!tr_error_is_set(context.error))
|
|
{
|
|
tr_error_set(context.error, EINVAL, "no files found");
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (piece_size_ == 0)
|
|
{
|
|
if (!tr_error_is_set(context.error))
|
|
{
|
|
tr_error_set(context.error, EINVAL, fmt::format("invalid piece size: {}", piece_size_));
|
|
}
|
|
return false;
|
|
}
|
|
|
|
tm_.block_info_.initSizes(tm_.files_.totalSize(), piece_size_);
|
|
return true;
|
|
}
|
|
|
|
// no metainfo; might be a Transmission 3.00-style magnet file
|
|
auto const ok = tm_.has_magnet_info_hash_;
|
|
return ok;
|
|
}
|
|
|
|
static constexpr std::string_view AcodecKey = "acodec"sv;
|
|
static constexpr std::string_view AnnounceKey = "announce"sv;
|
|
static constexpr std::string_view AnnounceListKey = "announce-list"sv;
|
|
static constexpr std::string_view AttrKey = "attr"sv;
|
|
static constexpr std::string_view AzureusPrivatePropertiesKey = "azureus_private_properties"sv;
|
|
static constexpr std::string_view AzureusPropertiesKey = "azureus_properties"sv;
|
|
static constexpr std::string_view ChecksumKey = "checksum"sv;
|
|
static constexpr std::string_view CollectionsKey = "collections"sv;
|
|
static constexpr std::string_view CommentKey = "comment"sv;
|
|
static constexpr std::string_view CommentUtf8Key = "comment.utf-8"sv;
|
|
static constexpr std::string_view Crc32Key = "crc32"sv;
|
|
static constexpr std::string_view CreatedByKey = "created by"sv;
|
|
static constexpr std::string_view CreatedByUtf8Key = "created by.utf-8"sv;
|
|
static constexpr std::string_view CreationDateKey = "creation date"sv;
|
|
static constexpr std::string_view DisplayNameKey = "display-name"sv;
|
|
static constexpr std::string_view DurationKey = "duration"sv;
|
|
static constexpr std::string_view Ed2kKey = "ed2k"sv;
|
|
static constexpr std::string_view EncodedRateKey = "encoded rate"sv;
|
|
static constexpr std::string_view EncodingKey = "encoding"sv;
|
|
static constexpr std::string_view EntropyKey = "entropy"sv;
|
|
static constexpr std::string_view ErrCallbackKey = "err_callback"sv;
|
|
static constexpr std::string_view FileDurationKey = "file-duration"sv;
|
|
static constexpr std::string_view FileMediaKey = "file-media"sv;
|
|
static constexpr std::string_view FileTreeKey = "file tree"sv;
|
|
static constexpr std::string_view FilehashKey = "filehash"sv;
|
|
static constexpr std::string_view FilesKey = "files"sv;
|
|
static constexpr std::string_view HeightKey = "height"sv;
|
|
static constexpr std::string_view HttpSeedsKey = "httpseeds"sv;
|
|
static constexpr std::string_view InfoKey = "info"sv;
|
|
static constexpr std::string_view InfoHashKey = "info_hash"sv;
|
|
static constexpr std::string_view LengthKey = "length"sv;
|
|
static constexpr std::string_view LibtorrentResumeKey = "libtorrent_resume"sv;
|
|
static constexpr std::string_view LocaleKey = "locale"sv;
|
|
static constexpr std::string_view LogCallbackKey = "log_callback"sv;
|
|
static constexpr std::string_view MagnetInfoKey = "magnet-info"sv;
|
|
static constexpr std::string_view Md5Key = "md5"sv;
|
|
static constexpr std::string_view Md5sumKey = "md5sum"sv;
|
|
static constexpr std::string_view MetaVersionKey = "meta version"sv;
|
|
static constexpr std::string_view MtimeKey = "mtime"sv;
|
|
static constexpr std::string_view NameKey = "name"sv;
|
|
static constexpr std::string_view NameUtf8Key = "name.utf-8"sv;
|
|
static constexpr std::string_view NodesKey = "nodes"sv;
|
|
static constexpr std::string_view PathKey = "path"sv;
|
|
static constexpr std::string_view PathUtf8Key = "path.utf-8"sv;
|
|
static constexpr std::string_view PieceLayersKey = "piece layers"sv;
|
|
static constexpr std::string_view PieceLengthKey = "piece length"sv;
|
|
static constexpr std::string_view PiecesKey = "pieces"sv;
|
|
static constexpr std::string_view PiecesRootKey = "pieces root"sv;
|
|
static constexpr std::string_view PrivateKey = "private"sv;
|
|
static constexpr std::string_view ProfilesKey = "profiles"sv;
|
|
static constexpr std::string_view PublisherKey = "publisher"sv;
|
|
static constexpr std::string_view PublisherUtf8Key = "publisher.utf-8"sv;
|
|
static constexpr std::string_view PublisherUrlKey = "publisher-url"sv;
|
|
static constexpr std::string_view PublisherUrlUtf8Key = "publisher-url.utf-8"sv;
|
|
static constexpr std::string_view Sha1Key = "sha1"sv;
|
|
static constexpr std::string_view SourceKey = "source"sv;
|
|
static constexpr std::string_view TitleKey = "title"sv;
|
|
static constexpr std::string_view UniqueKey = "unique"sv;
|
|
static constexpr std::string_view UrlListKey = "url-list"sv;
|
|
static constexpr std::string_view VcodecKey = "vcodec"sv;
|
|
static constexpr std::string_view WidthKey = "width"sv;
|
|
static constexpr std::string_view XCrossSeedKey = "x_cross_seed"sv;
|
|
};
|
|
|
|
bool tr_torrent_metainfo::parseBenc(std::string_view benc, tr_error** error)
|
|
{
|
|
auto stack = transmission::benc::ParserStack<MaxBencDepth>{};
|
|
auto handler = MetainfoHandler{ *this };
|
|
|
|
tr_error* my_error = nullptr;
|
|
|
|
if (error == nullptr)
|
|
{
|
|
error = &my_error;
|
|
}
|
|
auto const ok = transmission::benc::parse(benc, stack, handler, nullptr, error);
|
|
|
|
if (tr_error_is_set(error))
|
|
{
|
|
tr_logAddError(fmt::format("{} ({})", (*error)->message, (*error)->code));
|
|
}
|
|
|
|
tr_error_clear(&my_error);
|
|
|
|
if (!ok)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (std::empty(name_))
|
|
{
|
|
// TODO from first file
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool tr_torrent_metainfo::parseTorrentFile(std::string_view filename, std::vector<char>* contents, tr_error** error)
|
|
{
|
|
auto local_contents = std::vector<char>{};
|
|
|
|
if (contents == nullptr)
|
|
{
|
|
contents = &local_contents;
|
|
}
|
|
|
|
return tr_loadFile(filename, *contents, error) && parseBenc({ std::data(*contents), std::size(*contents) }, error);
|
|
}
|
|
|
|
tr_pathbuf tr_torrent_metainfo::makeFilename(
|
|
std::string_view dirname,
|
|
std::string_view name,
|
|
std::string_view info_hash_string,
|
|
BasenameFormat format,
|
|
std::string_view suffix)
|
|
{
|
|
// `${dirname}/${name}.${info_hash}${suffix}`
|
|
// `${dirname}/${info_hash}${suffix}`
|
|
return format == BasenameFormat::Hash ? tr_pathbuf{ dirname, '/', info_hash_string, suffix } :
|
|
tr_pathbuf{ dirname, '/', name, '.', info_hash_string.substr(0, 16), suffix };
|
|
}
|
|
|
|
bool tr_torrent_metainfo::migrateFile(
|
|
std::string_view dirname,
|
|
std::string_view name,
|
|
std::string_view info_hash_string,
|
|
std::string_view suffix)
|
|
{
|
|
auto const old_filename = makeFilename(dirname, name, info_hash_string, BasenameFormat::NameAndPartialHash, suffix);
|
|
if (!tr_sys_path_exists(old_filename))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
auto const new_filename = makeFilename(dirname, name, info_hash_string, BasenameFormat::Hash, suffix);
|
|
if (tr_sys_path_exists(new_filename))
|
|
{
|
|
tr_sys_path_remove(old_filename);
|
|
return false;
|
|
}
|
|
|
|
auto const renamed = tr_sys_path_rename(old_filename, new_filename);
|
|
if (!renamed)
|
|
{
|
|
tr_logAddError(
|
|
fmt::format(
|
|
_("Migrated torrent file from '{old_path}' to '{path}'"),
|
|
fmt::arg("old_path", old_filename),
|
|
fmt::arg("path", new_filename)),
|
|
name);
|
|
return true;
|
|
}
|
|
|
|
return renamed;
|
|
}
|
|
|
|
void tr_torrent_metainfo::removeFile(
|
|
std::string_view dirname,
|
|
std::string_view name,
|
|
std::string_view info_hash_string,
|
|
std::string_view suffix)
|
|
{
|
|
auto filename = makeFilename(dirname, name, info_hash_string, BasenameFormat::NameAndPartialHash, suffix);
|
|
tr_sys_path_remove(filename, nullptr);
|
|
|
|
filename = makeFilename(dirname, name, info_hash_string, BasenameFormat::Hash, suffix);
|
|
tr_sys_path_remove(filename, nullptr);
|
|
}
|