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libreoffice-online/loolwsd/LOOLKit.cpp
Ashod Nakashian 6536ba2fe2 loolwsd: correct multiview creation 
Change-Id: Id6675f6410793b743aec53182a4b5756b7cffa23
Reviewed-on: https://gerrit.libreoffice.org/27272
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
2016-07-18 02:49:45 +00:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/*
* The main entry point for the LibreOfficeKit process serving
* a document editing session.
*/
#include <dlfcn.h>
#include <ftw.h>
#include <limits.h>
#include <malloc.h>
#include <stdlib.h>
#include <sys/capability.h>
#include <unistd.h>
#include <utime.h>
#include <atomic>
#include <cassert>
#include <condition_variable>
#include <cstdlib>
#include <iostream>
#include <memory>
#define LOK_USE_UNSTABLE_API
#include <LibreOfficeKit/LibreOfficeKitInit.h>
#include <Poco/Exception.h>
#include <Poco/Net/HTTPClientSession.h>
#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/HTTPResponse.h>
#include <Poco/Net/NetException.h>
#include <Poco/Net/WebSocket.h>
#include <Poco/Process.h>
#include <Poco/Runnable.h>
#include <Poco/StringTokenizer.h>
#include <Poco/Thread.h>
#include <Poco/URI.h>
#include <Poco/Util/Application.h>
#include "ChildSession.hpp"
#include "Common.hpp"
#include "IoUtil.hpp"
#include "LOKitHelper.hpp"
#include "LOOLProtocol.hpp"
#include "LibreOfficeKit.hpp"
#include "Log.hpp"
#include "Png.hpp"
#include "QueueHandler.hpp"
#include "Rectangle.hpp"
#include "TileDesc.hpp"
#include "Unit.hpp"
#include "UserMessages.hpp"
#include "Util.hpp"
#define LIB_SOFFICEAPP "lib" "sofficeapp" ".so"
#define LIB_MERGED "lib" "mergedlo" ".so"
typedef int (LokHookPreInit) (const char *install_path, const char *user_profile_path);
using namespace LOOLProtocol;
using Poco::Exception;
using Poco::File;
using Poco::Net::NetException;
using Poco::Net::HTTPClientSession;
using Poco::Net::HTTPResponse;
using Poco::Net::HTTPRequest;
using Poco::Net::WebSocket;
using Poco::Path;
using Poco::Process;
using Poco::Runnable;
using Poco::StringTokenizer;
using Poco::Thread;
using Poco::Timestamp;
using Poco::Util::Application;
using Poco::URI;
namespace
{
typedef enum { COPY_ALL, COPY_LO, COPY_NO_USR } LinkOrCopyType;
LinkOrCopyType linkOrCopyType;
std::string sourceForLinkOrCopy;
Path destinationForLinkOrCopy;
bool shouldCopyDir(const char *path)
{
switch (linkOrCopyType)
{
case COPY_NO_USR:
// bind mounted.
return strcmp(path,"usr");
case COPY_LO:
return
strcmp(path, "program/wizards") &&
strcmp(path, "sdk") &&
strcmp(path, "share/basic") &&
strcmp(path, "share/gallery") &&
strcmp(path, "share/Scripts") &&
strcmp(path, "share/template") &&
strcmp(path, "share/config/wizard") &&
strcmp(path, "share/config/wizard");
default: // COPY_ALL
return true;
}
}
int linkOrCopyFunction(const char *fpath,
const struct stat* /*sb*/,
int typeflag,
struct FTW* /*ftwbuf*/)
{
if (strcmp(fpath, sourceForLinkOrCopy.c_str()) == 0)
return 0;
assert(fpath[strlen(sourceForLinkOrCopy.c_str())] == '/');
const char *relativeOldPath = fpath + strlen(sourceForLinkOrCopy.c_str()) + 1;
Path newPath(destinationForLinkOrCopy, Path(relativeOldPath));
switch (typeflag)
{
case FTW_F:
case FTW_SLN:
File(newPath.parent()).createDirectories();
if (link(fpath, newPath.toString().c_str()) == -1)
{
Log::syserror("link(\"" + std::string(fpath) + "\",\"" + newPath.toString() +
"\") failed. Exiting.");
std::_Exit(Application::EXIT_SOFTWARE);
}
break;
case FTW_D:
{
struct stat st;
if (stat(fpath, &st) == -1)
{
Log::syserror("stat(\"" + std::string(fpath) + "\") failed.");
return 1;
}
if (!shouldCopyDir(relativeOldPath))
{
Log::trace("skip redundant paths " + std::string(relativeOldPath));
return FTW_SKIP_SUBTREE;
}
File(newPath).createDirectories();
struct utimbuf ut;
ut.actime = st.st_atime;
ut.modtime = st.st_mtime;
if (utime(newPath.toString().c_str(), &ut) == -1)
{
Log::syserror("utime(\"" + newPath.toString() + "\") failed.");
return 1;
}
}
break;
case FTW_DNR:
Log::error("Cannot read directory '" + std::string(fpath) + "'");
return 1;
case FTW_NS:
Log::error("nftw: stat failed for '" + std::string(fpath) + "'");
return 1;
default:
Log::error("nftw: unexpected type: '" + std::to_string(typeflag));
assert(false);
break;
}
return 0;
}
void linkOrCopy(const std::string& source,
const Path& destination,
LinkOrCopyType type)
{
linkOrCopyType = type;
sourceForLinkOrCopy = source;
if (sourceForLinkOrCopy.back() == '/')
sourceForLinkOrCopy.pop_back();
destinationForLinkOrCopy = destination;
if (nftw(source.c_str(), linkOrCopyFunction, 10, FTW_ACTIONRETVAL) == -1)
Log::error("linkOrCopy: nftw() failed for '" + source + "'");
}
void dropCapability(cap_value_t capability)
{
cap_t caps;
cap_value_t cap_list[] = { capability };
caps = cap_get_proc();
if (caps == nullptr)
{
Log::syserror("cap_get_proc() failed.");
std::_Exit(1);
}
char *capText = cap_to_text(caps, nullptr);
Log::trace("Capabilities first: " + std::string(capText));
cap_free(capText);
if (cap_set_flag(caps, CAP_EFFECTIVE, sizeof(cap_list)/sizeof(cap_list[0]), cap_list, CAP_CLEAR) == -1 ||
cap_set_flag(caps, CAP_PERMITTED, sizeof(cap_list)/sizeof(cap_list[0]), cap_list, CAP_CLEAR) == -1)
{
Log::syserror("cap_set_flag() failed.");
std::_Exit(1);
}
if (cap_set_proc(caps) == -1)
{
Log::syserror("cap_set_proc() failed.");
std::_Exit(1);
}
capText = cap_to_text(caps, nullptr);
Log::trace("Capabilities now: " + std::string(capText));
cap_free(capText);
cap_free(caps);
}
}
class Connection: public Runnable
{
public:
Connection(std::shared_ptr<ChildSession> session,
std::shared_ptr<WebSocket> ws) :
_session(session),
_ws(ws),
_stop(false),
_joined(false)
{
Log::info("Connection ctor in child for " + _session->getId());
}
~Connection()
{
Log::info("~Connection dtor in child for " + _session->getId());
stop();
join();
}
std::shared_ptr<WebSocket> getWebSocket() const { return _ws; }
std::shared_ptr<ChildSession> getSession() { return _session; }
void start()
{
_thread.start(*this);
}
bool isRunning()
{
return _thread.isRunning();
}
void stop()
{
_stop = true;
}
void join()
{
// The thread is joinable only once.
std::unique_lock<std::mutex> lock(_threadMutex);
if (!_joined)
{
_thread.join();
_joined = true;
}
}
void run() override
{
Util::setThreadName("kit_ws_" + _session->getId());
Log::debug("Thread started.");
try
{
auto queue = std::make_shared<TileQueue>();
QueueHandler handler(queue, _session, "kit_queue_" + _session->getId());
Thread queueHandlerThread;
queueHandlerThread.start(handler);
std::shared_ptr<ChildSession> session = _session;
IoUtil::SocketProcessor(_ws,
[&queue](const std::vector<char>& payload)
{
queue->put(payload);
return true;
},
[&session]() { session->closeFrame(); },
[&queueHandlerThread]() { return TerminationFlag || !queueHandlerThread.isRunning(); });
queue->clear();
queue->put("eof");
queueHandlerThread.join();
if (session->isCloseFrame())
{
Log::trace("Normal close handshake.");
_ws->shutdown();
}
else
{
Log::trace("Abnormal close handshake.");
_ws->shutdown(WebSocket::WS_ENDPOINT_GOING_AWAY, SERVICE_UNAVALABLE_INTERNAL_ERROR);
}
}
catch (const Exception& exc)
{
Log::error() << "Connection::run: Exception: " << exc.displayText()
<< (exc.nested() ? " (" + exc.nested()->displayText() + ")" : "")
<< Log::end;
}
catch (const std::exception& exc)
{
Log::error(std::string("Connection::run: Exception: ") + exc.what());
}
catch (...)
{
Log::error("Connection::run:: Unexpected exception");
}
Log::debug("Thread finished.");
}
private:
Thread _thread;
std::shared_ptr<ChildSession> _session;
std::shared_ptr<WebSocket> _ws;
std::atomic<bool> _stop;
std::mutex _threadMutex;
std::atomic<bool> _joined;
};
/// A document container.
/// Owns LOKitDocument instance and connections.
/// Manages the lifetime of a document.
/// Technically, we can host multiple documents
/// per process. But for security reasons don't.
/// However, we could have a loolkit instance
/// per user or group of users (a trusted circle).
class Document
{
public:
/// We have two types of password protected documents
/// 1) Documents which require password to view
/// 2) Document which require password to modify
enum class PasswordType { ToView, ToModify };
Document(const std::shared_ptr<lok::Office>& loKit,
const std::string& jailId,
const std::string& docKey,
const std::string& url)
: _multiView(std::getenv("LOK_VIEW_CALLBACK")),
_loKit(loKit),
_jailId(jailId),
_docKey(docKey),
_url(url),
_docPassword(""),
_haveDocPassword(false),
_isDocPasswordProtected(false),
_docPasswordType(PasswordType::ToView),
_isLoading(0),
_clientViews(0)
{
Log::info("Document ctor for url [" + _url + "] on child [" + _jailId +
"] LOK_VIEW_CALLBACK=" + std::to_string(_multiView) + ".");
assert(_loKit && _loKit->get());
}
~Document()
{
Log::info("~Document dtor for url [" + _url + "] on child [" + _jailId +
"]. There are " + std::to_string(_clientViews) + " views.");
// Flag all connections to stop.
for (auto aIterator : _connections)
{
aIterator.second->stop();
}
// Destroy all connections and views.
for (auto aIterator : _connections)
{
try
{
// stop all websockets
if (aIterator.second->isRunning())
{
std::shared_ptr<WebSocket> ws = aIterator.second->getWebSocket();
if (ws)
{
ws->shutdownReceive();
aIterator.second->join();
}
}
}
catch(NetException& exc)
{
Log::error() << "Document::~Document: " << exc.displayText()
<< (exc.nested() ? " (" + exc.nested()->displayText() + ")" : "")
<< Log::end;
}
}
// Destroy all connections and views.
_connections.clear();
}
const std::string& getUrl() const { return _url; }
bool createSession(const std::string& sessionId, const unsigned intSessionId)
{
std::unique_lock<std::mutex> lock(_mutex);
try
{
const auto& it = _connections.find(intSessionId);
if (it != _connections.end())
{
// found item, check if still running
if (it->second->isRunning())
{
Log::warn("Session [" + sessionId + "] is already running.");
return true;
}
// Restore thread. TODO: Review this logic.
Log::warn("Session [" + sessionId + "] is not running. Restoring.");
_connections.erase(intSessionId);
}
Log::info() << "Creating " << (_clientViews ? "new" : "first")
<< " view for url: " << _url << " for sessionId: " << sessionId
<< " on jailId: " << _jailId << Log::end;
// Open websocket connection between the child process and the
// parent. The parent forwards us requests that it can't handle (i.e most).
HTTPClientSession cs("127.0.0.1", MasterPortNumber);
cs.setTimeout(0);
const auto childUrl = std::string(CHILD_URI) + "sessionId=" + sessionId + "&jailId=" + _jailId + "&docKey=" + _docKey;
HTTPRequest request(HTTPRequest::HTTP_GET, childUrl);
HTTPResponse response;
auto ws = std::make_shared<WebSocket>(cs, request, response);
ws->setReceiveTimeout(0);
auto session = std::make_shared<ChildSession>(sessionId, ws, _jailId,
[this](const std::string& id, const std::string& uri, const std::string& docPassword,
const std::string& renderOpts, bool haveDocPassword) { return onLoad(id, uri, docPassword, renderOpts, haveDocPassword); },
[this](const std::string& id) { onUnload(id); });
auto thread = std::make_shared<Connection>(session, ws);
const auto aInserted = _connections.emplace(intSessionId, thread);
if (aInserted.second)
{
thread->start();
}
else
{
Log::error("Connection already exists for child: " + _jailId + ", session: " + sessionId);
}
Log::debug("Connections: " + std::to_string(_connections.size()));
return true;
}
catch (const std::exception& ex)
{
Log::error("Exception while creating session [" + sessionId + "] on url [" + _url + "] - '" + ex.what() + "'.");
return false;
}
}
/// Purges dead connections and returns
/// the remaining number of clients.
/// Returns -1 on failure.
size_t purgeSessions()
{
std::vector<std::shared_ptr<ChildSession>> deadSessions;
size_t num_connections = 0;
{
std::unique_lock<std::mutex> lock(_mutex, std::defer_lock);
if (!lock.try_lock())
{
// Not a good time, try later.
return -1;
}
for (auto it = _connections.cbegin(); it != _connections.cend(); )
{
if (!it->second->isRunning())
{
deadSessions.push_back(it->second->getSession());
it = _connections.erase(it);
}
else
{
++it;
}
}
num_connections = _connections.size();
}
// Don't destroy sessions while holding our lock.
// We may deadlock if a session is waiting on us
// during callback initiated while handling a command
// and the dtor tries to take its lock (which is taken).
deadSessions.clear();
return num_connections;
}
/// Returns true if at least one *live* connection exists.
/// Does not consider user activity, just socket status.
bool hasConnections()
{
// -ve values for failure.
return purgeSessions() != 0;
}
/// Returns true if there is no activity and
/// the document is saved.
bool canDiscard()
{
//TODO: Implement proper time-out on inactivity.
return !hasConnections();
}
/// Set Document password for given URL
void setDocumentPassword(int nPasswordType)
{
Log::info() << "setDocumentPassword: passwordProtected=" << _isDocPasswordProtected
<< " passwordProvided=" << _haveDocPassword
<< " password='" << _docPassword << "'" << Log::end;
if (_isDocPasswordProtected && _haveDocPassword)
{
// it means this is the second attempt with the wrong password; abort the load operation
_loKit->setDocumentPassword(_jailedUrl.c_str(), nullptr);
return;
}
// One thing for sure, this is a password protected document
_isDocPasswordProtected = true;
if (nPasswordType == LOK_CALLBACK_DOCUMENT_PASSWORD)
_docPasswordType = PasswordType::ToView;
else if (nPasswordType == LOK_CALLBACK_DOCUMENT_PASSWORD_TO_MODIFY)
_docPasswordType = PasswordType::ToModify;
Log::info("Calling _loKit->setDocumentPassword");
if (_haveDocPassword)
_loKit->setDocumentPassword(_jailedUrl.c_str(), _docPassword.c_str());
else
_loKit->setDocumentPassword(_jailedUrl.c_str(), nullptr);
Log::info("setDocumentPassword returned");
}
void renderTile(StringTokenizer& tokens, const std::shared_ptr<Poco::Net::WebSocket>& ws)
{
auto tile = TileDesc::parse(tokens);
// Send back the request with all optional parameters given in the request.
const auto tileMsg = tile.serialize("tile:");
#if ENABLE_DEBUG
const std::string response = tileMsg + " renderid=" + Util::UniqueId() + "\n";
#else
const std::string response = tileMsg + "\n";
#endif
std::vector<char> output;
output.reserve(response.size() + (4 * tile.getWidth() * tile.getHeight()));
output.resize(response.size());
std::memcpy(output.data(), response.data(), response.size());
std::vector<unsigned char> pixmap;
pixmap.resize(output.capacity());
std::unique_lock<std::recursive_mutex> lock(ChildSession::getLock());
if (!_loKitDocument)
{
Log::error("Tile rendering requested before loading document.");
return;
}
Timestamp timestamp;
_loKitDocument->paintPartTile(pixmap.data(), tile.getPart(),
tile.getWidth(), tile.getHeight(),
tile.getTilePosX(), tile.getTilePosY(),
tile.getTileWidth(), tile.getTileHeight());
Log::trace() << "paintTile at (" << tile.getPart() << ',' << tile.getTilePosX() << ',' << tile.getTilePosY()
<< ") rendered in " << (timestamp.elapsed()/1000.) << " ms" << Log::end;
const auto mode = static_cast<LibreOfficeKitTileMode>(_loKitDocument->getTileMode());
if (!png::encodeBufferToPNG(pixmap.data(), tile.getWidth(), tile.getHeight(), output, mode))
{
//FIXME: Return error.
//sendTextFrame("error: cmd=tile kind=failure");
Log::error("Failed to encode tile into PNG.");
return;
}
const auto length = output.size();
if (length > SMALL_MESSAGE_SIZE)
{
const std::string nextmessage = "nextmessage: size=" + std::to_string(length);
ws->sendFrame(nextmessage.data(), nextmessage.size());
}
Log::trace("Sending render-tile response (" + std::to_string(length) + " bytes) for: " + response);
ws->sendFrame(output.data(), length, WebSocket::FRAME_BINARY);
}
void renderCombinedTiles(StringTokenizer& tokens, const std::shared_ptr<Poco::Net::WebSocket>& ws)
{
auto tileCombined = TileCombined::parse(tokens);
auto& tiles = tileCombined.getTiles();
Util::Rectangle renderArea;
std::vector<Util::Rectangle> tileRecs;
tileRecs.reserve(tiles.size());
for (auto& tile : tiles)
{
Util::Rectangle rectangle(tile.getTilePosX(), tile.getTilePosY(),
tileCombined.getTileWidth(), tileCombined.getTileHeight());
if (tileRecs.empty())
{
renderArea = rectangle;
}
else
{
renderArea.extend(rectangle);
}
tileRecs.push_back(rectangle);
}
const int tilesByX = renderArea.getWidth() / tileCombined.getTileWidth();
const int tilesByY = renderArea.getHeight() / tileCombined.getTileHeight();
const int pixmapWidth = tilesByX * tileCombined.getWidth();
const int pixmapHeight = tilesByY * tileCombined.getHeight();
const size_t pixmapSize = 4 * pixmapWidth * pixmapHeight;
std::vector<unsigned char> pixmap(pixmapSize, 0);
std::unique_lock<std::recursive_mutex> lock(ChildSession::getLock());
if (!_loKitDocument)
{
Log::error("Tile rendering requested before loading document.");
return;
}
Timestamp timestamp;
_loKitDocument->paintPartTile(pixmap.data(), tileCombined.getPart(),
pixmapWidth, pixmapHeight,
renderArea.getLeft(), renderArea.getTop(),
renderArea.getWidth(), renderArea.getHeight());
Log::debug() << "paintTile (combined) called, tile at [" << renderArea.getLeft() << ", " << renderArea.getTop() << "]"
<< " (" << renderArea.getWidth() << ", " << renderArea.getHeight() << ") rendered in "
<< double(timestamp.elapsed())/1000 << " ms." << Log::end;
const auto mode = static_cast<LibreOfficeKitTileMode>(_loKitDocument->getTileMode());
std::vector<char> output;
output.reserve(pixmapWidth * pixmapHeight * 4);
size_t tileIndex = 0;
for (Util::Rectangle& tileRect : tileRecs)
{
const int positionX = (tileRect.getLeft() - renderArea.getLeft()) / tileCombined.getTileWidth();
const int positionY = (tileRect.getTop() - renderArea.getTop()) / tileCombined.getTileHeight();
const auto oldSize = output.size();
const auto pixelWidth = tileCombined.getWidth();
const auto pixelHeight = tileCombined.getHeight();
if (!png::encodeSubBufferToPNG(pixmap.data(), positionX * pixelWidth, positionY * pixelHeight,
pixelWidth, pixelHeight, pixmapWidth, pixmapHeight, output, mode))
{
//FIXME: Return error.
//sendTextFrame("error: cmd=tile kind=failure");
Log::error("Failed to encode tile into PNG.");
return;
}
const auto imgSize = output.size() - oldSize;
Log::trace() << "Encoded tile #" << tileIndex << " in " << imgSize << " bytes." << Log::end;
tiles[tileIndex++].setImgSize(imgSize);
}
#if ENABLE_DEBUG
const auto tileMsg = tileCombined.serialize("tilecombine:") + " renderid=" + Util::UniqueId() + "\n";
#else
const auto tileMsg = tileCombined.serialize("tilecombine:") + "\n";
#endif
Log::trace("Sending back painted tiles for " + tileMsg);
std::vector<char> response;
response.resize(tileMsg.size() + output.size());
std::copy(tileMsg.begin(), tileMsg.end(), response.begin());
std::copy(output.begin(), output.end(), response.begin() + tileMsg.size());
const auto length = response.size();
if (length > SMALL_MESSAGE_SIZE)
{
const std::string nextmessage = "nextmessage: size=" + std::to_string(length);
ws->sendFrame(nextmessage.data(), nextmessage.size());
}
ws->sendFrame(response.data(), length, WebSocket::FRAME_BINARY);
}
private:
static void ViewCallback(int , const char* , void* )
{
//TODO: Delegate the callback.
}
static void DocumentCallback(const int nType, const char* pPayload, void* pData)
{
Log::trace() << "Document::DocumentCallback "
<< LOKitHelper::kitCallbackTypeToString(nType)
<< " [" << (pPayload ? pPayload : "") << "]." << Log::end;
Document* self = reinterpret_cast<Document*>(pData);
if (self == nullptr)
{
return;
}
std::unique_lock<std::mutex> lock(self->_mutex);
if (nType == LOK_CALLBACK_DOCUMENT_PASSWORD_TO_MODIFY ||
nType == LOK_CALLBACK_DOCUMENT_PASSWORD)
{
// Mark the document password type.
self->setDocumentPassword(nType);
return;
}
for (auto& it: self->_connections)
{
if (it.second->isRunning())
{
auto session = it.second->getSession();
if (session)
{
session->loKitCallback(nType, pPayload);
}
}
}
}
/// Load a document (or view) and register callbacks.
std::shared_ptr<lok::Document> onLoad(const std::string& sessionId,
const std::string& uri,
const std::string& docPassword,
const std::string& renderOpts,
bool haveDocPassword)
{
Log::info("Session " + sessionId + " is loading. " + std::to_string(_clientViews) + " views loaded.");
std::unique_lock<std::mutex> lock(_mutex);
while (_isLoading)
{
_cvLoading.wait(lock);
}
// Flag and release lock.
++_isLoading;
lock.unlock();
try
{
load(sessionId, uri, docPassword, renderOpts, haveDocPassword);
if (!_loKitDocument || !_loKitDocument->get())
{
return nullptr;
}
}
catch (const std::exception& exc)
{
Log::error("Exception while loading [" + uri + "] : " + exc.what());
return nullptr;
}
// Done loading, let the next one in (if any).
assert(_loKitDocument && _loKitDocument->get() && "Uninitialized lok::Document instance");
lock.lock();
++_clientViews;
--_isLoading;
_cvLoading.notify_one();
return _loKitDocument;
}
void onUnload(const std::string& sessionId)
{
const unsigned intSessionId = Util::decodeId(sessionId);
const auto it = _connections.find(intSessionId);
if (it == _connections.end() || !it->second || !_loKitDocument)
{
// Nothing to do.
return;
}
auto session = it->second->getSession();
auto sessionLock = session->getLock();
std::unique_lock<std::mutex> lock(_mutex);
Log::info("Session " + sessionId + " is unloading. Erasing connection.");
_connections.erase(it);
--_clientViews;
Log::info("Session " + sessionId + " is unloading. " + std::to_string(_clientViews) + " views will remain.");
if (_multiView && _loKitDocument)
{
Log::info() << "Document [" << _url << "] session ["
<< sessionId << "] unloaded, leaving "
<< _clientViews << " views." << Log::end;
const auto viewId = _loKitDocument->getView();
_loKitDocument->registerCallback(nullptr, nullptr);
_loKitDocument->destroyView(viewId);
}
}
private:
std::shared_ptr<lok::Document> load(const std::string& sessionId,
const std::string& uri,
const std::string& docPassword,
const std::string& renderOpts,
bool haveDocPassword)
{
const unsigned intSessionId = Util::decodeId(sessionId);
const auto it = _connections.find(intSessionId);
if (it == _connections.end() || !it->second)
{
Log::error("Cannot find session [" + sessionId + "].");
return nullptr;
}
auto session = it->second->getSession();
if (!_loKitDocument)
{
// This is the first time we are loading the document
Log::info("Loading new document from URI: [" + uri + "] for session [" + sessionId + "].");
auto lock(_loKit->getLock());
if (LIBREOFFICEKIT_HAS(_loKit->get(), registerCallback))
{
_loKit->get()->pClass->registerCallback(_loKit->get(), DocumentCallback, this);
const auto flags = LOK_FEATURE_DOCUMENT_PASSWORD
| LOK_FEATURE_DOCUMENT_PASSWORD_TO_MODIFY;
_loKit->setOptionalFeatures(flags);
}
// Save the provided password with us and the jailed url
_haveDocPassword = haveDocPassword;
_docPassword = docPassword;
_jailedUrl = uri;
_isDocPasswordProtected = false;
Log::debug("Calling lokit::documentLoad.");
_loKitDocument = _loKit->documentLoad(uri.c_str());
Log::debug("Returned lokit::documentLoad.");
if (!_loKitDocument || !_loKitDocument->get())
{
Log::error("Failed to load: " + uri + ", error: " + _loKit->getError());
// Checking if wrong password or no password was reason for failure.
if (_isDocPasswordProtected)
{
Log::info("Document [" + uri + "] is password protected.");
if (!_haveDocPassword)
{
Log::info("No password provided for password-protected document [" + uri + "].");
std::string passwordFrame = "passwordrequired:";
if (_docPasswordType == PasswordType::ToView)
passwordFrame += "to-view";
else if (_docPasswordType == PasswordType::ToModify)
passwordFrame += "to-modify";
session->sendTextFrame("error: cmd=load kind=" + passwordFrame);
}
else
{
Log::info("Wrong password for password-protected document [" + uri + "].");
session->sendTextFrame("error: cmd=load kind=wrongpassword");
}
}
return nullptr;
}
// Only save the options on opening the document.
// No support for changing them after opening a document.
_renderOpts = renderOpts;
}
else
{
// Check if this document requires password
if (_isDocPasswordProtected)
{
if (!haveDocPassword)
{
std::string passwordFrame = "passwordrequired:";
if (_docPasswordType == PasswordType::ToView)
passwordFrame += "to-view";
else if (_docPasswordType == PasswordType::ToModify)
passwordFrame += "to-modify";
session->sendTextFrame("error: cmd=load kind=" + passwordFrame);
return nullptr;
}
else if (docPassword != _docPassword)
{
session->sendTextFrame("error: cmd=load kind=wrongpassword");
return nullptr;
}
}
}
if (_multiView)
{
Log::info("Loading view to document from URI: [" + uri + "] for session [" + sessionId + "].");
const auto viewId = _loKitDocument->createView();
Log::info() << "Document [" << _url << "] view ["
<< viewId << "] loaded, leaving "
<< (_clientViews + 1) << " views." << Log::end;
}
// initializeForRendering() should be called before
// registerCallback(), as the previous creates a new view in Impress.
_loKitDocument->initializeForRendering(_renderOpts.c_str());
_loKitDocument->registerCallback(DocumentCallback, this);
return _loKitDocument;
}
private:
const bool _multiView;
std::shared_ptr<lok::Office> _loKit;
const std::string _jailId;
const std::string _docKey;
const std::string _url;
std::string _jailedUrl;
std::string _renderOpts;
std::shared_ptr<lok::Document> _loKitDocument;
// Document password provided
std::string _docPassword;
// Whether password was provided or not
bool _haveDocPassword;
// Whether document is password protected
bool _isDocPasswordProtected;
// Whether password is required to view the document, or modify it
PasswordType _docPasswordType;
std::mutex _mutex;
std::condition_variable _cvLoading;
std::atomic_size_t _isLoading;
std::map<unsigned, std::shared_ptr<Connection>> _connections;
std::atomic_size_t _clientViews;
};
namespace {
void symlinkPathToJail(const Path& jailPath, const std::string &loTemplate,
const std::string &loSubPath)
{
Path symlinkSource(jailPath, Path(loTemplate.substr(1)));
File(symlinkSource.parent()).createDirectories();
std::string symlinkTarget;
for (auto i = 0; i < Path(loTemplate).depth(); i++)
symlinkTarget += "../";
symlinkTarget += loSubPath;
Log::debug("symlink(\"" + symlinkTarget + "\",\"" + symlinkSource.toString() + "\")");
if (symlink(symlinkTarget.c_str(), symlinkSource.toString().c_str()) == -1)
{
Log::syserror("symlink(\"" + symlinkTarget + "\",\"" + symlinkSource.toString() + "\") failed");
throw Exception("symlink() failed");
}
}
}
void lokit_main(const std::string& childRoot,
const std::string& sysTemplate,
const std::string& loTemplate,
const std::string& loSubPath,
bool noCapabilities,
bool queryVersion)
{
// Reinitialize logging when forked.
Log::initialize("kit");
Util::rng::reseed();
assert(!childRoot.empty());
assert(!sysTemplate.empty());
assert(!loTemplate.empty());
assert(!loSubPath.empty());
// We only host a single document in our lifetime.
std::shared_ptr<Document> document;
// Ideally this will be a random ID, but forkit will cleanup
// our jail directory when we die, and it's simpler to know
// the jailId (i.e. the path) implicitly by knowing our pid.
static const std::string pid = std::to_string(Process::id());
static const std::string jailId = pid;
Util::setThreadName("loolkit");
Log::debug("Process started.");
Util::setTerminationSignals();
Util::setFatalSignals();
std::string instdir_path;
Path jailPath;
bool bRunInsideJail = !noCapabilities;
try
{
if (bRunInsideJail)
{
instdir_path = "/" + loSubPath + "/program";
jailPath = Path::forDirectory(childRoot + "/" + jailId);
Log::info("Jail path: " + jailPath.toString());
File(jailPath).createDirectories();
// Create a symlink inside the jailPath so that the absolute pathname loTemplate, when
// interpreted inside a chroot at jailPath, points to loSubPath (relative to the chroot).
symlinkPathToJail(jailPath, loTemplate, loSubPath);
// Font paths can end up as realpaths so match that too.
char *resolved = realpath(loTemplate.c_str(), NULL);
if (resolved)
{
if (strcmp(loTemplate.c_str(), resolved))
symlinkPathToJail(jailPath, std::string(resolved), loSubPath);
free (resolved);
}
Path jailLOInstallation(jailPath, loSubPath);
jailLOInstallation.makeDirectory();
File(jailLOInstallation).createDirectory();
// Copy (link) LO installation and other necessary files into it from the template.
bool bLoopMounted = false;
if (getenv("LOOL_BIND_MOUNT"))
{
Path usrSrcPath(sysTemplate, "usr");
Path usrDestPath(jailPath, "usr");
File(usrDestPath).createDirectory();
std::string mountCommand =
std::string("loolmount ") +
usrSrcPath.toString() +
std::string(" ") +
usrDestPath.toString();
Log::debug("Initializing jail bind mount.");
bLoopMounted = !system(mountCommand.c_str());
Log::debug("Initialized jail bind mount.");
}
linkOrCopy(sysTemplate, jailPath,
bLoopMounted ? COPY_NO_USR : COPY_ALL);
linkOrCopy(loTemplate, jailLOInstallation, COPY_LO);
// We need this because sometimes the hostname is not resolved
const auto networkFiles = {"/etc/host.conf", "/etc/hosts", "/etc/nsswitch.conf", "/etc/resolv.conf"};
for (const auto& filename : networkFiles)
{
const auto etcPath = Path(jailPath, filename).toString();
const File networkFile(filename);
if (networkFile.exists() && !File(etcPath).exists())
{
networkFile.copyTo(etcPath);
}
}
Log::debug("Initialized jail files.");
// Create the urandom and random devices
File(Path(jailPath, "/dev")).createDirectory();
if (mknod((jailPath.toString() + "/dev/random").c_str(),
S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH,
makedev(1, 8)) != 0)
{
Log::syserror("mknod(" + jailPath.toString() + "/dev/random) failed.");
}
if (mknod((jailPath.toString() + "/dev/urandom").c_str(),
S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH,
makedev(1, 9)) != 0)
{
Log::syserror("mknod(" + jailPath.toString() + "/dev/urandom) failed.");
}
Log::info("chroot(\"" + jailPath.toString() + "\")");
if (chroot(jailPath.toString().c_str()) == -1)
{
Log::syserror("chroot(\"" + jailPath.toString() + "\") failed.");
std::_Exit(Application::EXIT_SOFTWARE);
}
if (chdir("/") == -1)
{
Log::syserror("chdir(\"/\") in jail failed.");
std::_Exit(Application::EXIT_SOFTWARE);
}
dropCapability(CAP_SYS_CHROOT);
dropCapability(CAP_MKNOD);
dropCapability(CAP_FOWNER);
Log::debug("Initialized jail nodes, dropped caps.");
}
else // noCapabilities set
{
Log::info("Using template " + loTemplate + " as install subpath - skipping jail setup");
instdir_path = "/" + loTemplate + "/program";
}
std::shared_ptr<lok::Office> loKit;
{
const char *instdir = instdir_path.c_str();
const char *userdir = "file:///user";
auto kit = UnitKit::get().lok_init(instdir, userdir);
if (!kit)
{
kit = lok_init_2(instdir, userdir);
}
loKit = std::make_shared<lok::Office>(kit);
if (!loKit || !loKit->get())
{
Log::error("LibreOfficeKit initialization failed. Exiting.");
std::_Exit(Application::EXIT_SOFTWARE);
}
}
assert(loKit && loKit->get());
Log::info("Process is ready.");
// Open websocket connection between the child process and WSD.
HTTPClientSession cs("127.0.0.1", MasterPortNumber);
cs.setTimeout(0);
std::string requestUrl = std::string(NEW_CHILD_URI) + "pid=" + pid;
if (queryVersion)
{
char* versionInfo = loKit->getVersionInfo();
std::string encodedVersionStr;
URI::encode(std::string(versionInfo), "", encodedVersionStr);
requestUrl += "&version=" + encodedVersionStr;
free(versionInfo);
}
HTTPRequest request(HTTPRequest::HTTP_GET, requestUrl);
HTTPResponse response;
auto ws = std::make_shared<WebSocket>(cs, request, response);
ws->setReceiveTimeout(0);
const std::string socketName = "ChildControllerWS";
IoUtil::SocketProcessor(ws,
[&socketName, &ws, &document, &loKit](const std::vector<char>& data)
{
std::string message(data.data(), data.size());
if (UnitKit::get().filterKitMessage(ws, message))
return true;
Log::debug(socketName + ": recv [" + LOOLProtocol::getAbbreviatedMessage(message) + "].");
StringTokenizer tokens(message, " ", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
// Note: Syntax or parsing errors here are unexpected and fatal.
if (TerminationFlag)
{
Log::debug("Too late, we're going down");
}
else if (tokens[0] == "session")
{
const std::string& sessionId = tokens[1];
const unsigned intSessionId = Util::decodeId(sessionId);
const std::string& docKey = tokens[2];
std::string url;
URI::decode(docKey, url);
Log::info("New session [" + sessionId + "] request on url [" + url + "].");
if (!document)
{
document = std::make_shared<Document>(loKit, jailId, docKey, url);
}
// Validate and create session.
if (!(url == document->getUrl() &&
document->createSession(sessionId, intSessionId)))
{
Log::debug("CreateSession failed.");
}
}
else if (tokens[0] == "tile")
{
if (document)
{
document->renderTile(tokens, ws);
}
else
{
Log::warn("No document while processing tile request.");
}
}
else if (tokens[0] == "tilecombine")
{
if (document)
{
document->renderCombinedTiles(tokens, ws);
}
else
{
Log::warn("No document while processing tilecombine request.");
}
}
else if (document && document->canDiscard())
{
TerminationFlag = true;
}
else
{
Log::info("Bad or unknown token [" + tokens[0] + "]");
}
return true;
},
[]() {},
[&document]()
{
if (document && document->canDiscard())
TerminationFlag = true;
return TerminationFlag.load();
});
// Clean up jail if we created one
if (bRunInsideJail && !jailPath.isRelative())
{
// In theory we should here do Util::removeFile("/", true), because we are inside the
// chroot jail, and all of it can be removed now when we are exiting. (At least the root
// of the chroot jail probably would not be removed even if we tried, so we still would
// need to complete the cleanup in loolforkit.)
// But: It is way too risky to actually do that (effectively, "rm -rf /") as it would
// trash a developer's machine if something goes wrong while hacking and debugging and
// the process isn't in a chroot after all when it comes here.
// So just remove what we can reasonably safely assume won't exist as global pathnames
// on a developer's machine, loSubpath (typically "/lo") and JAILED_DOCUMENT_ROOT
// ("/user/docs/").
Log::info("Removing '/" + loSubPath + "'");
Util::removeFile("/" + loSubPath, true);
Log::info("Removing '" + std::string(JAILED_DOCUMENT_ROOT) + "'");
Util::removeFile(std::string(JAILED_DOCUMENT_ROOT), true);
}
}
catch (const Exception& exc)
{
Log::error() << "Poco Exception: " << exc.displayText()
<< (exc.nested() ? " (" + exc.nested()->displayText() + ")" : "")
<< Log::end;
}
catch (const std::exception& exc)
{
Log::error(std::string("Exception: ") + exc.what());
}
// Sleep a second here in case we get a fatal signal just when about to finish up, which sadly
// seems to happen often, so that handleFatalSignal() in Util.cpp has time to produce a
// backtrace.
sleep(1);
Log::info("Process finished.");
std::_Exit(Application::EXIT_OK);
}
/// Initializes LibreOfficeKit for cross-fork re-use.
bool globalPreinit(const std::string &loTemplate)
{
const std::string libSofficeapp = loTemplate + "/program/" LIB_SOFFICEAPP;
const std::string libMerged = loTemplate + "/program/" LIB_MERGED;
std::string loadedLibrary;
void *handle;
if (File(libMerged).exists())
{
handle = dlopen(libMerged.c_str(), RTLD_GLOBAL|RTLD_NOW);
if (!handle)
{
Log::error("Failed to load " + libMerged + ": " + std::string(dlerror()));
return false;
}
loadedLibrary = libMerged;
}
else
{
if (File(libSofficeapp).exists())
{
handle = dlopen(libSofficeapp.c_str(), RTLD_GLOBAL|RTLD_NOW);
if (!handle)
{
Log::error("Failed to load " + libSofficeapp + ": " + std::string(dlerror()));
return false;
}
loadedLibrary = libSofficeapp;
}
else
{
Log::error("Neither " + libSofficeapp + " or " + libMerged + " exist.");
return false;
}
}
LokHookPreInit* preInit = (LokHookPreInit *)dlsym(handle, "lok_preinit");
if (!preInit)
{
Log::error("No lok_preinit symbol in " + loadedLibrary + ": " + std::string(dlerror()));
return false;
}
if (preInit((loTemplate + "/program").c_str(), "file:///user") != 0)
{
Log::error("lok_preinit() in " + loadedLibrary + " failed");
return false;
}
return true;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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