639 lines
21 KiB
C++
639 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Parts of this file is covered by:
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include "config.h"
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// This is the main source for the loolwsd program. LOOL uses several loolwsd processes: one main
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// parent process that listens on the TCP port and accepts connections from LOOL clients, and a
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// number of child processes, each which handles a viewing (editing) session for one document.
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#include <errno.h>
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#include <unistd.h>
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#ifdef __linux
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#include <sys/types.h>
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#include <sys/wait.h>
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#endif
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#include <cassert>
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#include <cstdlib>
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#include <cstring>
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#include <iostream>
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#define LOK_USE_UNSTABLE_API
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#include <LibreOfficeKit/LibreOfficeKitInit.h>
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#include <Poco/File.h>
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#include <Poco/Net/HTTPClientSession.h>
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#include <Poco/Net/HTTPRequest.h>
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#include <Poco/Net/HTTPRequestHandler.h>
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#include <Poco/Net/HTTPRequestHandlerFactory.h>
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#include <Poco/Net/HTTPServer.h>
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#include <Poco/Net/HTTPServerParams.h>
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#include <Poco/Net/HTTPServerParams.h>
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#include <Poco/Net/HTTPServerRequest.h>
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#include <Poco/Net/HTTPServerResponse.h>
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#include <Poco/Net/NetException.h>
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#include <Poco/Net/ServerSocket.h>
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#include <Poco/Net/WebSocket.h>
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#include <Poco/Path.h>
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#include <Poco/Process.h>
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#include <Poco/Util/HelpFormatter.h>
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#include <Poco/Util/Option.h>
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#include <Poco/Util/OptionException.h>
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#include <Poco/Util/OptionSet.h>
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#include <Poco/Util/ServerApplication.h>
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#include "LOOLProtocol.hpp"
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#include "LOOLSession.hpp"
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#include "LOOLWSD.hpp"
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#include "Util.hpp"
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using namespace LOOLProtocol;
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using Poco::File;
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using Poco::Net::HTTPClientSession;
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using Poco::Net::HTTPRequest;
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using Poco::Net::HTTPRequestHandler;
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using Poco::Net::HTTPRequestHandlerFactory;
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using Poco::Net::HTTPResponse;
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using Poco::Net::HTTPServer;
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using Poco::Net::HTTPServerParams;
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using Poco::Net::HTTPServerRequest;
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using Poco::Net::HTTPServerResponse;
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using Poco::Net::ServerSocket;
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using Poco::Net::WebSocket;
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using Poco::Net::WebSocketException;
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using Poco::Path;
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using Poco::Process;
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using Poco::Runnable;
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using Poco::Thread;
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using Poco::Util::Application;
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using Poco::Util::HelpFormatter;
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using Poco::Util::IncompatibleOptionsException;
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using Poco::Util::MissingOptionException;
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using Poco::Util::Option;
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using Poco::Util::OptionSet;
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using Poco::Util::ServerApplication;
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class WebSocketRequestHandler: public HTTPRequestHandler
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/// Handle a WebSocket connection.
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{
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public:
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WebSocketRequestHandler()
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{
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}
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void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response) override
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{
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if(!(request.find("Upgrade") != request.end() && Poco::icompare(request["Upgrade"], "websocket") == 0))
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{
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response.setStatusAndReason(HTTPResponse::HTTP_BAD_REQUEST);
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response.setContentLength(0);
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response.send();
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return;
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}
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Application& app = Application::instance();
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try
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{
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try
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{
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WebSocket ws(request, response);
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std::shared_ptr<MasterProcessSession> session;
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if (request.getURI() == LOOLWSD::CHILD_URI)
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{
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session.reset(new MasterProcessSession(ws, LOOLSession::Kind::ToPrisoner));
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}
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else
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{
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session.reset(new MasterProcessSession(ws, LOOLSession::Kind::ToClient));
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}
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// Loop, receiving WebSocket messages either from the
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// client, or from the child process (to be forwarded to
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// the client).
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int flags;
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int n;
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ws.setReceiveTimeout(0);
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do
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{
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char buffer[100000];
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n = ws.receiveFrame(buffer, sizeof(buffer), flags);
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if (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE)
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if (!session->handleInput(buffer, n))
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n = 0;
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}
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while (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE);
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}
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catch (WebSocketException& exc)
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{
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app.logger().error(Util::logPrefix() + "WebSocketException: " + exc.message());
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switch (exc.code())
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{
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case WebSocket::WS_ERR_HANDSHAKE_UNSUPPORTED_VERSION:
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response.set("Sec-WebSocket-Version", WebSocket::WEBSOCKET_VERSION);
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// fallthrough
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case WebSocket::WS_ERR_NO_HANDSHAKE:
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case WebSocket::WS_ERR_HANDSHAKE_NO_VERSION:
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case WebSocket::WS_ERR_HANDSHAKE_NO_KEY:
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response.setStatusAndReason(HTTPResponse::HTTP_BAD_REQUEST);
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response.setContentLength(0);
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response.send();
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break;
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}
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}
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}
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catch (Poco::IOException& exc)
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{
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app.logger().error(Util::logPrefix() + "IOException: " + exc.message());
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}
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}
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};
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class RequestHandlerFactory: public HTTPRequestHandlerFactory
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{
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public:
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RequestHandlerFactory()
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{
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}
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HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request) override
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{
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Application& app = Application::instance();
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std::string line = (Util::logPrefix() + "Request from " +
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request.clientAddress().toString() + ": " +
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request.getMethod() + " " +
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request.getURI() + " " +
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request.getVersion());
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for (HTTPServerRequest::ConstIterator it = request.begin(); it != request.end(); ++it)
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{
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line += " / " + it->first + ": " + it->second;
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}
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app.logger().information(line);
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return new WebSocketRequestHandler();
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}
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};
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class TestOutput: public Runnable
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{
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public:
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TestOutput(WebSocket& ws) :
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_ws(ws)
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{
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}
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void run() override
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{
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int flags;
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int n;
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Application& app = Application::instance();
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_ws.setReceiveTimeout(0);
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try
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{
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do
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{
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char buffer[100000];
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n = _ws.receiveFrame(buffer, sizeof(buffer), flags);
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if (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE)
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{
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std::cout <<
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Util::logPrefix() <<
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"Client got " << n << " bytes: " << getAbbreviatedMessage(buffer, n) <<
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std::endl;
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}
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}
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while (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE);
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}
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catch (WebSocketException& exc)
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{
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app.logger().error(Util::logPrefix() + "WebSocketException: " + exc.message());
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_ws.close();
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}
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}
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private:
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WebSocket& _ws;
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};
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class TestInput: public Runnable
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{
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public:
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TestInput(ServerApplication& main, ServerSocket& svs, HTTPServer& srv) :
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_main(main),
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_svs(svs),
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_srv(srv)
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{
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}
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void run() override
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{
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HTTPClientSession cs("127.0.0.1", _svs.address().port());
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HTTPRequest request(HTTPRequest::HTTP_GET, "/ws");
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HTTPResponse response;
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WebSocket ws(cs, request, response);
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Thread thread;
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TestOutput output(ws);
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thread.start(output);
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if (isatty(0))
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{
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std::cout << std::endl;
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std::cout << "Enter LOOL WS requests, one per line. Enter EOF to finish." << std::endl;
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}
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while (!std::cin.eof())
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{
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std::string line;
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std::getline(std::cin, line);
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ws.sendFrame(line.c_str(), line.size());
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}
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thread.join();
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_srv.stopAll();
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_main.terminate();
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}
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private:
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ServerApplication& _main;
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ServerSocket& _svs;
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HTTPServer& _srv;
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};
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class Undertaker : public Runnable
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{
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public:
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Undertaker()
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{
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}
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void run() override
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{
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bool someChildrenHaveDied = false;
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while (!someChildrenHaveDied || MasterProcessSession::_childProcesses.size() > 0)
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{
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int status;
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pid_t pid = waitpid(-1, &status, 0);
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if (pid < 0)
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{
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if (errno == ECHILD)
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{
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if (!someChildrenHaveDied)
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{
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// We haven't spawned any children yet, or at least none has died yet. So
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// wait a bit and try again
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Thread::sleep(1000);
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continue;
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}
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else
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{
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// We have spawned children, and we think that we still have them running,
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// but we don't, huh? Something badly messed up, or just a timing glitch,
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// like we are at the moment in the process of spawning new children?
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// Sleep or return from the function (i.e. finish the Undertaker thread)?
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std::cout << Util::logPrefix() << "No child processes even if we think there should be some!?" << std::endl;
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return;
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}
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}
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}
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if (WIFSIGNALED(status))
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Application::instance().logger().error(Util::logPrefix() + "Child " + std::to_string(pid) + " killed by signal " + Util::signalName(WTERMSIG(status)));
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else
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Application::instance().logger().information(Util::logPrefix() + "Child " + std::to_string(pid) + " died normally, status: " + std::to_string(WEXITSTATUS(status)));
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if (MasterProcessSession::_childProcesses.find(pid) == MasterProcessSession::_childProcesses.end())
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std::cout << Util::logPrefix() << "(Not one of our known child processes)" << std::endl;
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else
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{
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File jailDir(MasterProcessSession::getJailPath(MasterProcessSession::_childProcesses[pid]));
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MasterProcessSession::_childProcesses.erase(pid);
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someChildrenHaveDied = true;
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if (!jailDir.exists() || !jailDir.isDirectory())
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{
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Application::instance().logger().error(Util::logPrefix() + "Jail '" + jailDir.path() + "' does not exist or is not a directory");
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}
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else
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{
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std::cout << Util::logPrefix() << "Removing jail tree " << jailDir.path() << std::endl;
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jailDir.remove(true);
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}
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}
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}
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std::cout << Util::logPrefix() << "All child processes have died (I hope)" << std::endl;
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}
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};
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int LOOLWSD::portNumber = DEFAULT_PORT_NUMBER;
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std::string LOOLWSD::sysTemplate;
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std::string LOOLWSD::loTemplate;
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std::string LOOLWSD::childRoot;
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std::string LOOLWSD::loSubPath = "lo";
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std::string LOOLWSD::jail;
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int LOOLWSD::numPreSpawnedChildren = 10;
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const std::string LOOLWSD::CHILD_URI = "/loolws/child/";
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LOOLWSD::LOOLWSD() :
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_doTest(false),
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_childId(0)
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{
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}
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LOOLWSD::~LOOLWSD()
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{
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}
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void LOOLWSD::initialize(Application& self)
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{
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ServerApplication::initialize(self);
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}
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void LOOLWSD::uninitialize()
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{
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ServerApplication::uninitialize();
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}
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void LOOLWSD::defineOptions(OptionSet& options)
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{
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ServerApplication::defineOptions(options);
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options.addOption(Option("help", "", "Display help information on command line arguments.")
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.required(false)
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.repeatable(false));
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options.addOption(Option("port", "", "Port number to listen to (default: " + std::to_string(LOOLWSD::DEFAULT_PORT_NUMBER) + ").")
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.required(false)
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.repeatable(false)
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.argument("port number"));
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options.addOption(Option("systemplate", "", "Path to a template tree with shared libraries etc to be used as source for chroot jails for child processes.")
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.required(false)
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.repeatable(false)
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.argument("directory"));
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options.addOption(Option("lotemplate", "", "Path to a LibreOffice installation tree to be copied (linked) into the jails for child processes. Should be on the same file system as systemplate.")
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.required(false)
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.repeatable(false)
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.argument("directory"));
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options.addOption(Option("childroot", "", "Path to the directory under which the chroot jails for the child processes will be created. Should be on the same file system as systemplate and lotemplate.")
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.required(false)
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.repeatable(false)
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.argument("directory"));
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options.addOption(Option("losubpath", "", "Relative path where the LibreOffice installation will be copied inside a jail (default: '" + loSubPath + "').")
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.required(false)
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.repeatable(false)
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.argument("relative path"));
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options.addOption(Option("numprespawns", "", "Number of child processes to keep started in advance and waiting for new clients.")
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.required(false)
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.repeatable(false)
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.argument("port number"));
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options.addOption(Option("test", "", "Interactive testing.")
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.required(false)
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.repeatable(false));
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options.addOption(Option("child", "", "For internal use only.")
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.required(false)
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.repeatable(false)
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.argument("child id"));
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options.addOption(Option("jail", "", "For internal use only.")
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.required(false)
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.repeatable(false)
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.argument("directory"));
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}
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void LOOLWSD::handleOption(const std::string& name, const std::string& value)
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{
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ServerApplication::handleOption(name, value);
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if (name == "help")
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{
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displayHelp();
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exit(Application::EXIT_OK);
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}
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else if (name == "port")
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portNumber = std::stoi(value);
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else if (name == "systemplate")
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sysTemplate = value;
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else if (name == "lotemplate")
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loTemplate = value;
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else if (name == "childroot")
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childRoot = value;
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else if (name == "losubpath")
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loSubPath = value;
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else if (name == "numprespawns")
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numPreSpawnedChildren = std::stoi(value);
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else if (name == "test")
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_doTest = true;
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else if (name == "child")
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_childId = std::stoull(value);
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else if (name == "jail")
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jail = value;
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}
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void LOOLWSD::displayHelp()
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{
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HelpFormatter helpFormatter(options());
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helpFormatter.setCommand(commandName());
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helpFormatter.setUsage("OPTIONS");
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helpFormatter.setHeader("LibreOffice On-Line WebSocket server.");
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helpFormatter.format(std::cout);
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}
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int LOOLWSD::childMain()
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{
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std::cout << Util::logPrefix() << "Child here!" << std::endl;
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// We use the same option set for both parent and child loolwsd,
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// so must check options required in the child (but not in the
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// parent) separately now. And also for options that are
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// meaningless to the child.
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if (jail == "")
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throw MissingOptionException("systemplate");
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if (sysTemplate != "")
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throw IncompatibleOptionsException("systemplate");
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if (loTemplate != "")
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throw IncompatibleOptionsException("lotemplate");
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if (childRoot != "")
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throw IncompatibleOptionsException("childroot");
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if (chroot(jail.c_str()) == -1)
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{
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logger().error("chroot(\"" + jail + "\") failed: " + strerror(errno));
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exit(1);
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}
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if (chdir("/") == -1)
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{
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logger().error(std::string("chdir(\"/\") in jail failed: ") + strerror(errno));
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exit(1);
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}
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if (std::getenv("SLEEPFORDEBUGGER"))
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{
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std::cout << "Sleeping " << std::getenv("SLEEPFORDEBUGGER") << " seconds, " <<
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"attach process " << Poco::Process::id() << " in debugger now." << std::endl;
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Thread::sleep(std::stoul(std::getenv("SLEEPFORDEBUGGER")) * 1000);
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}
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LibreOfficeKit *loKit(lok_init_2(("/" + loSubPath + "/program").c_str(), "file:///user"));
|
|
|
|
if (!loKit)
|
|
{
|
|
logger().fatal(Util::logPrefix() + "LibreOfficeKit initialisation failed");
|
|
return Application::EXIT_UNAVAILABLE;
|
|
}
|
|
|
|
// Open websocket connection between the child process and the
|
|
// parent. The parent forwards us requests that it can't handle.
|
|
|
|
HTTPClientSession cs("127.0.0.1", portNumber);
|
|
HTTPRequest request(HTTPRequest::HTTP_GET, LOOLWSD::CHILD_URI);
|
|
HTTPResponse response;
|
|
WebSocket ws(cs, request, response);
|
|
|
|
ChildProcessSession session(ws, loKit);
|
|
|
|
ws.setReceiveTimeout(0);
|
|
|
|
std::string hello("child " + std::to_string(_childId));
|
|
session.sendTextFrame(hello);
|
|
|
|
int flags;
|
|
int n;
|
|
do
|
|
{
|
|
char buffer[1024];
|
|
n = ws.receiveFrame(buffer, sizeof(buffer), flags);
|
|
|
|
if (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE)
|
|
if (!session.handleInput(buffer, n))
|
|
n = 0;
|
|
}
|
|
while (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE);
|
|
|
|
return Application::EXIT_OK;
|
|
}
|
|
|
|
int LOOLWSD::main(const std::vector<std::string>& args)
|
|
{
|
|
if (access(LOOLWSD_CACHEDIR, R_OK | W_OK | X_OK) != 0)
|
|
{
|
|
std::cout << "Unable to access " << LOOLWSD_CACHEDIR <<
|
|
", please make sure it exists, and has write permission for this user." << std::endl;
|
|
return Application::EXIT_UNAVAILABLE;
|
|
}
|
|
|
|
if (childMode())
|
|
return childMain();
|
|
|
|
// We use the same option set for both parent and child loolwsd,
|
|
// so must check options required in the parent (but not in the
|
|
// child) separately now. Also check for options that are
|
|
// meaningless for the parent.
|
|
if (sysTemplate == "")
|
|
throw MissingOptionException("systemplate");
|
|
if (loTemplate == "")
|
|
throw MissingOptionException("lotemplate");
|
|
if (childRoot == "")
|
|
throw MissingOptionException("childroot");
|
|
|
|
if (_childId != 0)
|
|
throw IncompatibleOptionsException("child");
|
|
if (jail != "")
|
|
throw IncompatibleOptionsException("jail");
|
|
|
|
// Set up a thread to reap child processes and clean up after them
|
|
Undertaker undertaker;
|
|
Thread undertakerThread;
|
|
undertakerThread.start(undertaker);
|
|
|
|
for (int i = 0; i < numPreSpawnedChildren; i++)
|
|
MasterProcessSession::preSpawn();
|
|
|
|
ServerSocket svs(portNumber);
|
|
|
|
HTTPServer srv(new RequestHandlerFactory(), svs, new HTTPServerParams);
|
|
|
|
srv.start();
|
|
|
|
TestInput input(*this, svs, srv);
|
|
Thread inputThread;
|
|
if (_doTest)
|
|
{
|
|
inputThread.start(input);
|
|
}
|
|
|
|
waitForTerminationRequest();
|
|
|
|
// Doing this causes a crash. So just let the process proceed and exit.
|
|
// srv.stop();
|
|
|
|
if (_doTest)
|
|
inputThread.join();
|
|
|
|
// Terminate child processes
|
|
for (auto i : MasterProcessSession::_childProcesses)
|
|
{
|
|
logger().information(Util::logPrefix() + "Requesting child process " + std::to_string(i.first) + " to terminate");
|
|
Process::requestTermination(i.first);
|
|
}
|
|
|
|
undertakerThread.join();
|
|
|
|
return Application::EXIT_OK;
|
|
}
|
|
|
|
bool LOOLWSD::childMode() const
|
|
{
|
|
return _childId != 0;
|
|
}
|
|
|
|
POCO_SERVER_MAIN(LOOLWSD)
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|