// This file Copyright © 2008-2023 Mnemosyne LLC. // It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only), // or any future license endorsed by Mnemosyne LLC. // License text can be found in the licenses/ folder. #include #include #include #include /* for strcspn() */ #include #include #include #include #include #include #ifndef _WIN32 #include #include #include #endif #include #include #include /* TODO: eventually remove this */ #include #include #include #include #include "libtransmission/transmission.h" #include "libtransmission/crypto-utils.h" /* tr_ssha1_matches() */ #include "libtransmission/error.h" #include "libtransmission/log.h" #include "libtransmission/net.h" #include "libtransmission/platform.h" /* tr_getWebClientDir() */ #include "libtransmission/quark.h" #include "libtransmission/rpc-server.h" #include "libtransmission/rpcimpl.h" #include "libtransmission/session-id.h" #include "libtransmission/session.h" #include "libtransmission/timer.h" #include "libtransmission/tr-assert.h" #include "libtransmission/tr-strbuf.h" #include "libtransmission/utils.h" #include "libtransmission/variant.h" #include "libtransmission/web-utils.h" #include "libtransmission/web.h" /* session-id is used to make cross-site request forgery attacks difficult. * Don't disable this feature unless you really know what you're doing! * https://en.wikipedia.org/wiki/Cross-site_request_forgery * https://shiflett.org/articles/cross-site-request-forgeries * http://www.webappsec.org/lists/websecurity/archive/2008-04/msg00037.html */ #define REQUIRE_SESSION_ID #define MY_REALM "Transmission" using namespace std::literals; namespace { auto constexpr TrUnixSocketPrefix = "unix:"sv; /* The maximum size of a unix socket path is defined per-platform based on sockaddr_un.sun_path. * On Windows the fallback is the length of an ipv6 address. Subtracting one at the end is for * double counting null terminators from sun_path and TrUnixSocketPrefix. */ #ifdef _WIN32 auto inline constexpr TrUnixAddrStrLen = size_t{ INET6_ADDRSTRLEN }; #else auto inline constexpr TrUnixAddrStrLen = size_t{ sizeof(((struct sockaddr_un*)nullptr)->sun_path) + std::size(TrUnixSocketPrefix) }; #endif enum tr_rpc_address_type { TR_RPC_INET_ADDR, TR_RPC_UNIX_ADDR }; class tr_unix_addr { public: [[nodiscard]] std::string to_string() const { return std::empty(unix_socket_path_) ? unix_socket_path_ : std::string(TrUnixSocketPrefix); } [[nodiscard]] bool from_string(std::string_view src) { if (!tr_strvStartsWith(TrUnixSocketPrefix, src)) { return false; } if (std::size(src) >= TrUnixAddrStrLen) { tr_logAddError(fmt::format( _("Unix socket path must be fewer than {count} characters (including '{prefix}' prefix)"), fmt::arg("count", TrUnixAddrStrLen - 1), fmt::arg("prefix", TrUnixSocketPrefix))); return false; } unix_socket_path_ = src; return true; } private: std::string unix_socket_path_ = {}; }; } // namespace class tr_rpc_address { public: tr_rpc_address() : inet_addr_(tr_address::any_ipv4()) { } [[nodiscard]] constexpr auto is_unix_addr() const noexcept { return type_ == TR_RPC_UNIX_ADDR; } [[nodiscard]] constexpr auto is_inet_addr() const noexcept { return type_ == TR_RPC_INET_ADDR; } bool from_string(std::string_view src) { if (auto address = tr_address::from_string(src); address.has_value()) { type_ = TR_RPC_INET_ADDR; inet_addr_ = address.value(); return true; } if (unix_addr_.from_string(src)) { type_ = TR_RPC_UNIX_ADDR; return true; } return false; } [[nodiscard]] std::string to_string(tr_port port = {}) const { if (type_ == TR_RPC_UNIX_ADDR) { return unix_addr_.to_string(); } if (port.empty()) { return { inet_addr_.display_name() }; } return { inet_addr_.display_name(port) }; } private: tr_rpc_address_type type_ = TR_RPC_INET_ADDR; struct tr_address inet_addr_; class tr_unix_addr unix_addr_; }; namespace { int constexpr DeflateLevel = 6; // medium / default // --- void send_simple_response(struct evhttp_request* req, int code, char const* text = nullptr) { char const* code_text = tr_webGetResponseStr(code); struct evbuffer* body = evbuffer_new(); evbuffer_add_printf(body, "

%d: %s

", code, code_text); if (text != nullptr) { evbuffer_add_printf(body, "%s", text); } evhttp_send_reply(req, code, code_text, body); evbuffer_free(body); } // --- [[nodiscard]] constexpr char const* mimetype_guess(std::string_view path) { // these are the ones we need for serving the web client's files... auto constexpr Types = std::array, 7>{ { { ".css"sv, "text/css" }, { ".gif"sv, "image/gif" }, { ".html"sv, "text/html" }, { ".ico"sv, "image/vnd.microsoft.icon" }, { ".js"sv, "application/javascript" }, { ".png"sv, "image/png" }, { ".svg"sv, "image/svg+xml" }, } }; for (auto const& [suffix, mime_type] : Types) { if (tr_strvEndsWith(path, suffix)) { return mime_type; } } return "application/octet-stream"; } [[nodiscard]] evbuffer* make_response(struct evhttp_request* req, tr_rpc_server const* server, std::string_view content) { auto* const out = evbuffer_new(); char const* key = "Accept-Encoding"; char const* encoding = evhttp_find_header(req->input_headers, key); if (bool const do_compress = encoding != nullptr && tr_strvContains(encoding, "gzip"sv); !do_compress) { evbuffer_add(out, std::data(content), std::size(content)); } else { auto const max_compressed_len = libdeflate_deflate_compress_bound(server->compressor.get(), std::size(content)); auto iov = evbuffer_iovec{}; evbuffer_reserve_space(out, std::max(std::size(content), max_compressed_len), &iov, 1); auto const compressed_len = libdeflate_gzip_compress( server->compressor.get(), std::data(content), std::size(content), iov.iov_base, iov.iov_len); if (0 < compressed_len && compressed_len < std::size(content)) { iov.iov_len = compressed_len; evhttp_add_header(req->output_headers, "Content-Encoding", "gzip"); } else { std::copy(std::begin(content), std::end(content), static_cast(iov.iov_base)); iov.iov_len = std::size(content); } evbuffer_commit_space(out, &iov, 1); } return out; } void add_time_header(struct evkeyvalq* headers, char const* key, time_t now) { // RFC 2616 says this must follow RFC 1123's date format, so use gmtime instead of localtime evhttp_add_header(headers, key, fmt::format("{:%a %b %d %T %Y%n}", fmt::gmtime(now)).c_str()); } void serve_file(struct evhttp_request* req, tr_rpc_server const* server, std::string_view filename) { if (req->type != EVHTTP_REQ_GET) { evhttp_add_header(req->output_headers, "Allow", "GET"); send_simple_response(req, HTTP_BADMETHOD); return; } auto content = std::vector{}; if (tr_error* error = nullptr; !tr_loadFile(filename, content, &error)) { send_simple_response(req, HTTP_NOTFOUND, fmt::format("{} ({})", filename, error->message).c_str()); tr_error_free(error); return; } auto const now = tr_time(); add_time_header(req->output_headers, "Date", now); add_time_header(req->output_headers, "Expires", now + (24 * 60 * 60)); evhttp_add_header(req->output_headers, "Content-Type", mimetype_guess(filename)); auto* const response = make_response(req, server, std::string_view{ std::data(content), std::size(content) }); evhttp_send_reply(req, HTTP_OK, "OK", response); evbuffer_free(response); } void handle_web_client(struct evhttp_request* req, tr_rpc_server const* server) { if (std::empty(server->web_client_dir_)) { send_simple_response( req, HTTP_NOTFOUND, "

Couldn't find Transmission's web interface files!

" "

Users: to tell Transmission where to look, " "set the TRANSMISSION_WEB_HOME environment " "variable to the folder where the web interface's " "index.html is located.

" "

Package Builders: to set a custom default at compile time, " "#define PACKAGE_DATA_DIR in libtransmission/platform.c " "or tweak tr_getClutchDir() by hand.

"); } else { // convert `req->uri` (ex: "/transmission/web/images/favicon.png") // into a filesystem path (ex: "/usr/share/transmission/web/images/favicon.png") // remove the "/transmission/web/" prefix static auto constexpr Web = "web/"sv; auto subpath = std::string_view{ req->uri }.substr(std::size(server->url()) + std::size(Web)); // remove any trailing query / fragment subpath = subpath.substr(0, subpath.find_first_of("?#"sv)); // if the query is empty, use the default static auto constexpr DefaultPage = "index.html"sv; if (std::empty(subpath)) { subpath = DefaultPage; } if (tr_strvContains(subpath, ".."sv)) { send_simple_response(req, HTTP_NOTFOUND); } else { serve_file(req, server, tr_pathbuf{ server->web_client_dir_, '/', subpath }); } } } struct rpc_response_data { struct evhttp_request* req; tr_rpc_server* server; }; void rpc_response_func(tr_session* /*session*/, tr_variant* content, void* user_data) { auto* data = static_cast(user_data); auto* const response = make_response(data->req, data->server, tr_variantToStr(content, TR_VARIANT_FMT_JSON_LEAN)); evhttp_add_header(data->req->output_headers, "Content-Type", "application/json; charset=UTF-8"); evhttp_send_reply(data->req, HTTP_OK, "OK", response); evbuffer_free(response); delete data; } void handle_rpc_from_json(struct evhttp_request* req, tr_rpc_server* server, std::string_view json) { auto top = tr_variant{}; auto const have_content = tr_variantFromBuf(&top, TR_VARIANT_PARSE_JSON | TR_VARIANT_PARSE_INPLACE, json); tr_rpc_request_exec_json( server->session, have_content ? &top : nullptr, rpc_response_func, new rpc_response_data{ req, server }); if (have_content) { tr_variantClear(&top); } } void handle_rpc(struct evhttp_request* req, tr_rpc_server* server) { if (req->type == EVHTTP_REQ_POST) { auto json = std::string_view{ reinterpret_cast(evbuffer_pullup(req->input_buffer, -1)), evbuffer_get_length(req->input_buffer) }; handle_rpc_from_json(req, server, json); return; } send_simple_response(req, HTTP_BADMETHOD); } bool is_address_allowed(tr_rpc_server const* server, char const* address) { if (!server->is_whitelist_enabled()) { return true; } auto const& src = server->whitelist_; return std::any_of(std::begin(src), std::end(src), [&address](auto const& s) { return tr_wildmat(address, s); }); } bool isIPAddressWithOptionalPort(char const* host) { auto address = sockaddr_storage{}; int address_len = sizeof(address); /* TODO: move to net.{c,h} */ return evutil_parse_sockaddr_port(host, reinterpret_cast(&address), &address_len) != -1; } bool isHostnameAllowed(tr_rpc_server const* server, evhttp_request const* req) { /* If password auth is enabled, any hostname is permitted. */ if (server->is_password_enabled()) { return true; } /* If whitelist is disabled, no restrictions. */ if (!server->is_host_whitelist_enabled_) { return true; } char const* const host = evhttp_find_header(req->input_headers, "Host"); /* No host header, invalid request. */ if (host == nullptr) { return false; } /* IP address is always acceptable. */ if (isIPAddressWithOptionalPort(host)) { return true; } /* Host header might include the port. */ auto const hostname = std::string(host, strcspn(host, ":")); /* localhost is always acceptable. */ if (hostname == "localhost" || hostname == "localhost.") { return true; } auto const& src = server->host_whitelist_; return std::any_of(std::begin(src), std::end(src), [&hostname](auto const& str) { return tr_wildmat(hostname, str); }); } bool test_session_id(tr_rpc_server const* server, evhttp_request const* req) { char const* const session_id = evhttp_find_header(req->input_headers, TR_RPC_SESSION_ID_HEADER); return session_id != nullptr && server->session->sessionId() == session_id; } bool is_authorized(tr_rpc_server const* server, char const* auth_header) { if (!server->is_password_enabled()) { return true; } // https://datatracker.ietf.org/doc/html/rfc7617 // `Basic ${base64(username)}:${base64(password)}` auto constexpr Prefix = "Basic "sv; auto auth = std::string_view{ auth_header != nullptr ? auth_header : "" }; if (!tr_strvStartsWith(auth, Prefix)) { return false; } auth.remove_prefix(std::size(Prefix)); auto const decoded_str = tr_base64_decode(auth); auto decoded = std::string_view{ decoded_str }; auto const username = tr_strvSep(&decoded, ':'); auto const password = decoded; return server->username() == username && tr_ssha1_matches(server->salted_password_, password); } void handle_request(struct evhttp_request* req, void* arg) { auto constexpr HttpErrorUnauthorized = 401; auto constexpr HttpErrorForbidden = 403; auto* server = static_cast(arg); if (req != nullptr && req->evcon != nullptr) { evhttp_add_header(req->output_headers, "Server", MY_REALM); if (server->is_anti_brute_force_enabled() && server->login_attempts_ >= server->anti_brute_force_limit_) { send_simple_response(req, HttpErrorForbidden); return; } if (!is_address_allowed(server, req->remote_host)) { send_simple_response(req, HttpErrorForbidden); return; } evhttp_add_header(req->output_headers, "Access-Control-Allow-Origin", "*"); if (req->type == EVHTTP_REQ_OPTIONS) { if (char const* headers = evhttp_find_header(req->input_headers, "Access-Control-Request-Headers"); headers != nullptr) { evhttp_add_header(req->output_headers, "Access-Control-Allow-Headers", headers); } evhttp_add_header(req->output_headers, "Access-Control-Allow-Methods", "GET, POST, OPTIONS"); send_simple_response(req, HTTP_OK); return; } if (!is_authorized(server, evhttp_find_header(req->input_headers, "Authorization"))) { evhttp_add_header(req->output_headers, "WWW-Authenticate", "Basic realm=\"" MY_REALM "\""); if (server->is_anti_brute_force_enabled()) { ++server->login_attempts_; } send_simple_response(req, HttpErrorUnauthorized); return; } server->login_attempts_ = 0; auto uri = std::string_view{ req->uri }; auto const location = tr_strvStartsWith(uri, server->url()) ? uri.substr(std::size(server->url())) : ""sv; if (std::empty(location) || location == "web"sv) { auto const new_location = fmt::format(FMT_STRING("{:s}web/"), server->url()); evhttp_add_header(req->output_headers, "Location", new_location.c_str()); send_simple_response(req, HTTP_MOVEPERM, nullptr); } else if (tr_strvStartsWith(location, "web/"sv)) { handle_web_client(req, server); } else if (!isHostnameAllowed(server, req)) { char const* const tmp = "

Transmission received your request, but the hostname was unrecognized.

" "

To fix this, choose one of the following options:" "

    " "
  • Enable password authentication, then any hostname is allowed.
  • " "
  • Add the hostname you want to use to the whitelist in settings.
  • " "

" "

If you're editing settings.json, see the 'rpc-host-whitelist' and 'rpc-host-whitelist-enabled' entries.

" "

This requirement has been added to help prevent " "DNS Rebinding " "attacks.

"; send_simple_response(req, 421, tmp); } #ifdef REQUIRE_SESSION_ID else if (!test_session_id(server, req)) { auto const session_id = std::string{ server->session->sessionId() }; auto const tmp = fmt::format( FMT_STRING("

Your request had an invalid session-id header.

" "

To fix this, follow these steps:" "

  1. When reading a response, get its X-Transmission-Session-Id header and remember it" "
  2. Add the updated header to your outgoing requests" "
  3. When you get this 409 error message, resend your request with the updated header" "

" "

This requirement has been added to help prevent " "CSRF " "attacks.

" "

{:s}: {:s}

"), TR_RPC_SESSION_ID_HEADER, session_id); evhttp_add_header(req->output_headers, TR_RPC_SESSION_ID_HEADER, session_id.c_str()); evhttp_add_header(req->output_headers, "Access-Control-Expose-Headers", TR_RPC_SESSION_ID_HEADER); send_simple_response(req, 409, tmp.c_str()); } #endif else if (tr_strvStartsWith(location, "rpc"sv)) { handle_rpc(req, server); } else { send_simple_response(req, HTTP_NOTFOUND, req->uri); } } } auto constexpr ServerStartRetryCount = int{ 10 }; auto constexpr ServerStartRetryDelayIncrement = 5s; auto constexpr ServerStartRetryMaxDelay = 60s; bool bindUnixSocket( [[maybe_unused]] struct event_base* base, [[maybe_unused]] struct evhttp* httpd, [[maybe_unused]] char const* path, [[maybe_unused]] tr_mode_t socket_mode) { #ifdef _WIN32 tr_logAddError(fmt::format( _("Unix sockets are unsupported on Windows. Please change '{key}' in your settings."), fmt::arg("key", tr_quark_get_string_view(TR_KEY_rpc_bind_address)))); return false; #else auto addr = sockaddr_un{}; addr.sun_family = AF_UNIX; tr_strlcpy(addr.sun_path, path + std::size(TrUnixSocketPrefix), sizeof(addr.sun_path)); unlink(addr.sun_path); struct evconnlistener* lev = evconnlistener_new_bind( base, nullptr, nullptr, LEV_OPT_CLOSE_ON_FREE, -1, reinterpret_cast(&addr), sizeof(addr)); if (lev == nullptr) { return false; } if (chmod(addr.sun_path, socket_mode) != 0) { tr_logAddWarn( fmt::format(_("Couldn't set RPC socket mode to {mode:#o}, defaulting to 0755"), fmt::arg("mode", socket_mode))); } return evhttp_bind_listener(httpd, lev) != nullptr; #endif } void start_server(tr_rpc_server* server); auto rpc_server_start_retry(tr_rpc_server* server) { if (!server->start_retry_timer) { server->start_retry_timer = server->session->timerMaker().create([server]() { start_server(server); }); } ++server->start_retry_counter; auto const interval = std::min(ServerStartRetryDelayIncrement * server->start_retry_counter, ServerStartRetryMaxDelay); server->start_retry_timer->start_single_shot(std::chrono::duration_cast(interval)); return interval; } void rpc_server_start_retry_cancel(tr_rpc_server* server) { server->start_retry_timer.reset(); server->start_retry_counter = 0; } void start_server(tr_rpc_server* server) { if (server->httpd) { return; } auto* const base = server->session->event_base(); auto* const httpd = evhttp_new(base); evhttp_set_allowed_methods(httpd, EVHTTP_REQ_GET | EVHTTP_REQ_POST | EVHTTP_REQ_OPTIONS); auto const address = server->get_bind_address(); auto const port = server->port(); bool const success = server->bind_address_->is_unix_addr() ? bindUnixSocket(base, httpd, address.c_str(), server->socket_mode_) : (evhttp_bind_socket(httpd, address.c_str(), port.host()) != -1); auto const addr_port_str = server->bind_address_->to_string(port); if (!success) { evhttp_free(httpd); if (server->start_retry_counter < ServerStartRetryCount) { auto const retry_delay = rpc_server_start_retry(server); auto const seconds = std::chrono::duration_cast(retry_delay).count(); tr_logAddDebug(fmt::format("Couldn't bind to {}, retrying in {} seconds", addr_port_str, seconds)); return; } tr_logAddError(fmt::format( tr_ngettext( "Couldn't bind to {address} after {count} attempt, giving up", "Couldn't bind to {address} after {count} attempts, giving up", ServerStartRetryCount), fmt::arg("address", addr_port_str), fmt::arg("count", ServerStartRetryCount))); } else { evhttp_set_gencb(httpd, handle_request, server); server->httpd.reset(httpd); tr_logAddInfo(fmt::format(_("Listening for RPC and Web requests on '{address}'"), fmt::arg("address", addr_port_str))); } rpc_server_start_retry_cancel(server); } void stop_server(tr_rpc_server* server) { auto const lock = server->session->unique_lock(); rpc_server_start_retry_cancel(server); auto& httpd = server->httpd; if (!httpd) { return; } auto const address = server->get_bind_address(); httpd.reset(); if (server->bind_address_->is_unix_addr()) { unlink(address.c_str() + std::size(TrUnixSocketPrefix)); } tr_logAddInfo(fmt::format( _("Stopped listening for RPC and Web requests on '{address}'"), fmt::arg("address", server->bind_address_->to_string(server->port())))); } void restart_server(tr_rpc_server* const server) { if (server->is_enabled()) { stop_server(server); start_server(server); } } auto parse_whitelist(std::string_view whitelist) { auto list = std::vector{}; while (!std::empty(whitelist)) { auto const pos = whitelist.find_first_of(" ,;"sv); auto const token = tr_strvStrip(whitelist.substr(0, pos)); list.emplace_back(token); tr_logAddInfo(fmt::format(_("Added '{entry}' to host whitelist"), fmt::arg("entry", token))); whitelist = pos == std::string_view::npos ? ""sv : whitelist.substr(pos + 1); } return list; } } // namespace void tr_rpc_server::set_enabled(bool is_enabled) { is_enabled_ = is_enabled; session->runInSessionThread( [this]() { if (!is_enabled_) { stop_server(this); } else { start_server(this); } }); } void tr_rpc_server::set_port(tr_port port) noexcept { if (port_ == port) { return; } port_ = port; if (is_enabled()) { session->runInSessionThread(&restart_server, this); } } void tr_rpc_server::set_url(std::string_view url) { url_ = url; tr_logAddDebug(fmt::format(FMT_STRING("setting our URL to '{:s}'"), url_)); } void tr_rpc_server::set_whitelist(std::string_view whitelist) { this->whitelist_str_ = whitelist; this->whitelist_ = parse_whitelist(whitelist); } // --- PASSWORD void tr_rpc_server::set_username(std::string_view username) { username_ = username; tr_logAddDebug(fmt::format(FMT_STRING("setting our username to '{:s}'"), username_)); } void tr_rpc_server::set_password(std::string_view password) noexcept { auto const is_salted = tr_ssha1_test(password); salted_password_ = is_salted ? password : tr_ssha1(password); tr_logAddDebug(fmt::format(FMT_STRING("setting our salted password to '{:s}'"), salted_password_)); } void tr_rpc_server::set_password_enabled(bool enabled) { is_password_enabled_ = enabled; tr_logAddDebug(fmt::format("setting password-enabled to '{}'", enabled)); } std::string tr_rpc_server::get_bind_address() const { return bind_address_->to_string(); } void tr_rpc_server::set_anti_brute_force_enabled(bool enabled) noexcept { is_anti_brute_force_enabled_ = enabled; if (!enabled) { login_attempts_ = 0; } } // --- LIFECYCLE tr_rpc_server::tr_rpc_server(tr_session* session_in, tr_variant* settings) : compressor{ libdeflate_alloc_compressor(DeflateLevel), libdeflate_free_compressor } , web_client_dir_{ tr_getWebClientDir(session_in) } , bind_address_(std::make_unique()) , session{ session_in } { load(settings); } void tr_rpc_server::load(tr_variant* src) { #define V(key, field, type, default_value, comment) \ if (auto* const child = tr_variantDictFind(src, key); child != nullptr) \ { \ if (auto val = libtransmission::VariantConverter::load(child); val) \ { \ this->field = *val; \ } \ } RPC_SETTINGS_FIELDS(V) #undef V if (!tr_strvEndsWith(url_, '/')) { url_ = fmt::format(FMT_STRING("{:s}/"), url_); } this->host_whitelist_ = parse_whitelist(host_whitelist_str_); this->set_password_enabled(authentication_required_); this->set_whitelist(whitelist_str_); this->set_username(username_); this->set_password(salted_password_); if (!bind_address_->from_string(bind_address_str_)) { // NOTE: bind_address_ is default initialized to INADDR_ANY tr_logAddWarn(fmt::format( _("The '{key}' setting is '{value}' but must be an IPv4 or IPv6 address or a Unix socket path. Using default value '0.0.0.0'"), fmt::format("key", tr_quark_get_string_view(TR_KEY_rpc_bind_address)), fmt::format("value", bind_address_str_))); } if (bind_address_->is_unix_addr()) { this->set_whitelist_enabled(false); this->is_host_whitelist_enabled_ = false; } if (this->is_enabled()) { auto const rpc_uri = bind_address_->to_string(this->port()) + this->url_; tr_logAddInfo(fmt::format(_("Serving RPC and Web requests on {address}"), fmt::arg("address", rpc_uri))); session->runInSessionThread(start_server, this); if (this->is_whitelist_enabled()) { tr_logAddInfo(_("Whitelist enabled")); } if (this->is_password_enabled()) { tr_logAddInfo(_("Password required")); } } if (!std::empty(web_client_dir_)) { tr_logAddInfo(fmt::format(_("Serving RPC and Web requests from '{path}'"), fmt::arg("path", web_client_dir_))); } } void tr_rpc_server::save(tr_variant* tgt) const { #define V(key, field, type, default_value, comment) \ tr_variantDictRemove(tgt, key); \ libtransmission::VariantConverter::save(tr_variantDictAdd(tgt, key), field); RPC_SETTINGS_FIELDS(V) #undef V } void tr_rpc_server::default_settings(tr_variant* tgt){ #define V(key, field, type, default_value, comment) \ { \ tr_variantDictRemove(tgt, key); \ libtransmission::VariantConverter::save(tr_variantDictAdd(tgt, key), default_value); \ } RPC_SETTINGS_FIELDS(V) #undef V } tr_rpc_server::~tr_rpc_server() { stop_server(this); }