950 lines
29 KiB
C++
950 lines
29 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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#include <sys/types.h>
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#include <sys/wait.h>
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#include <utime.h>
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#include <ftw.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#include <atomic>
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#include <mutex>
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#include <cstring>
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#include <cassert>
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#include <iostream>
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#include <fstream>
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#include <deque>
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#include <Poco/Types.h>
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#include <Poco/Random.h>
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#include <Poco/Path.h>
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#include <Poco/File.h>
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#include <Poco/ThreadLocal.h>
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#include <Poco/Process.h>
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#include <Poco/Thread.h>
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#include <Poco/NamedMutex.h>
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#include "Common.hpp"
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#include "Capabilities.hpp"
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#include "Util.hpp"
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// First include the grist of the helper process - ideally
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// we can avoid execve and share lots of memory here. We
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// can't link to a non-PIC translation unit though, so
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// include to share.
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#define LOOLKIT_NO_MAIN 1
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#include "LOOLKit.cpp"
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#define LIB_SOFFICEAPP "lib" "sofficeapp" ".so"
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#define LIB_MERGED "lib" "mergedlo" ".so"
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#define LIB_SCLO "lib" "sclo" ".so"
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#define LIB_SWLO "lib" "swlo" ".so"
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#define LIB_SDLO "lib" "sdlo" ".so"
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#define JAILED_LOOLKIT_PATH "/usr/bin/loolkit"
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typedef int (LokHookPreInit) ( const char *install_path, const char *user_profile_path );
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using Poco::Path;
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using Poco::File;
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using Poco::ThreadLocal;
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using Poco::Process;
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using Poco::Thread;
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using Poco::ProcessHandle;
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const std::string FIFO_FILE = "/tmp/loolwsdfifo";
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const std::string FIFO_BROKER = "/tmp/loolbroker.fifo";
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const std::string BROKER_SUFIX = ".fifo";
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const std::string BROKER_PREFIX = "/tmp/lokit";
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static int readerChild = -1;
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static int readerBroker = -1;
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static std::atomic<unsigned> forkCounter;
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static std::chrono::steady_clock::time_point lastMaintenanceTime = std::chrono::steady_clock::now();
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static unsigned int childCounter = 0;
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static signed numPreSpawnedChildren = 0;
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static std::recursive_mutex forkMutex;
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static std::map<Process::PID, int> _childProcesses;
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static std::map<std::string, Process::PID> _cacheURL;
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namespace
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{
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/// Safely looks up the pipe descriptor
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/// of a child. Returns -1 on error.
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int getChildPipe(const Process::PID pid)
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{
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std::lock_guard<std::recursive_mutex> lock(forkMutex);
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const auto it = _childProcesses.find(pid);
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return (it != _childProcesses.end() ? it->second : -1);
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}
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void requestAbnormalTermination(const Process::PID aPID)
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{
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if (kill(aPID, SIGTERM) != 0 && kill(aPID, 0) != 0)
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{
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Log::info("Cannot terminate lokit [" + std::to_string(aPID) + "].");
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}
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}
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/// Safely removes a child process and
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/// invalidates the URL cache.
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void removeChild(const Process::PID pid)
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{
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std::lock_guard<std::recursive_mutex> lock(forkMutex);
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const auto it = _childProcesses.find(pid);
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if (it != _childProcesses.end())
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{
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// Close the write pipe.
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requestAbnormalTermination(pid);
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close(it->second);
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_childProcesses.erase(it);
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_cacheURL.clear();
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++forkCounter;
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}
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}
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ThreadLocal<std::string> sourceForLinkOrCopy;
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ThreadLocal<Path> destinationForLinkOrCopy;
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int linkOrCopyFunction(const char *fpath,
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const struct stat* /*sb*/,
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int typeflag,
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struct FTW* /*ftwbuf*/)
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{
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if (strcmp(fpath, sourceForLinkOrCopy->c_str()) == 0)
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return 0;
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assert(fpath[strlen(sourceForLinkOrCopy->c_str())] == '/');
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const char *relativeOldPath = fpath + strlen(sourceForLinkOrCopy->c_str()) + 1;
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#ifdef __APPLE__
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if (strcmp(relativeOldPath, "PkgInfo") == 0)
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return 0;
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#endif
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Path newPath(*destinationForLinkOrCopy, Path(relativeOldPath));
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switch (typeflag)
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{
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case FTW_F:
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File(newPath.parent()).createDirectories();
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if (link(fpath, newPath.toString().c_str()) == -1)
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{
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Log::error("Error: link(\"" + std::string(fpath) + "\",\"" + newPath.toString() +
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"\") failed. Exiting.");
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exit(1);
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}
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break;
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case FTW_DP:
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{
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struct stat st;
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if (stat(fpath, &st) == -1)
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{
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Log::error("Error: stat(\"" + std::string(fpath) + "\") failed.");
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return 1;
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}
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File(newPath).createDirectories();
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struct utimbuf ut;
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ut.actime = st.st_atime;
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ut.modtime = st.st_mtime;
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if (utime(newPath.toString().c_str(), &ut) == -1)
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{
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Log::error("Error: utime(\"" + newPath.toString() + "\", &ut) failed.");
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return 1;
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}
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}
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break;
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case FTW_DNR:
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Log::error("Cannot read directory '" + std::string(fpath) + "'");
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return 1;
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case FTW_NS:
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Log::error("nftw: stat failed for '" + std::string(fpath) + "'");
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return 1;
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case FTW_SLN:
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Log::error("nftw: symlink to nonexistent file: '" + std::string(fpath) + "', ignored.");
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break;
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default:
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assert(false);
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}
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return 0;
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}
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void linkOrCopy(const std::string& source, const Path& destination)
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{
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*sourceForLinkOrCopy = source;
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if (sourceForLinkOrCopy->back() == '/')
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sourceForLinkOrCopy->pop_back();
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*destinationForLinkOrCopy = destination;
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if (nftw(source.c_str(), linkOrCopyFunction, 10, FTW_DEPTH) == -1)
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Log::error("linkOrCopy: nftw() failed for '" + source + "'");
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}
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}
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class PipeRunnable: public Runnable
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{
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public:
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PipeRunnable()
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: _pStart(nullptr),
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_pEnd(nullptr)
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{
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}
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ssize_t getResponseLine(int nPipeReader, std::string& aLine)
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{
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ssize_t nBytes = -1;
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aLine.clear();
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try
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{
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while (true)
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{
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if ( _pStart == _pEnd )
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{
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nBytes = Util::readMessage(nPipeReader, _aBuffer, sizeof(_aBuffer));
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if ( nBytes < 0 )
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{
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_pStart = _pEnd = nullptr;
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break;
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}
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_pStart = _aBuffer;
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_pEnd = _aBuffer + nBytes;
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}
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if ( _pStart != _pEnd )
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{
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char aChar = *_pStart++;
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while (_pStart != _pEnd && aChar != '\r' && aChar != '\n')
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{
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aLine += aChar;
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aChar = *_pStart++;
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}
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if ( aChar == '\r' && *_pStart == '\n')
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{
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_pStart++;
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break;
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}
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}
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}
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}
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catch (const std::exception& exc)
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{
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Log::error() << "Exception while reading from pipe ["
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<< nPipeReader << "]: " << exc.what() << Log::end;
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return -1;
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}
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return nBytes;
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}
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bool createThread(const Process::PID nPID, const std::string& aTID, const std::string& aURL)
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{
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const std::string aMessage = "thread " + aTID + " " + aURL + "\r\n";
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if (Util::writeFIFO(getChildPipe(nPID), aMessage) < 0)
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{
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Log::error("Error sending thread message to child [" + std::to_string(nPID) + "].");
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return false;
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}
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std::string aResponse;
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if (getResponseLine(readerChild, aResponse) < 0)
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{
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Log::error("Error reading response to thread message from child [" + std::to_string(nPID) + "].");
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return false;
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}
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StringTokenizer tokens(aResponse, " ", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
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return (tokens.count() == 2 && tokens[1] == "ok");
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}
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void verifyChilds()
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{
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std::lock_guard<std::recursive_mutex> lock(forkMutex);
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// Sanitize cache.
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Log::trace("Verifying Childs.");
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for (auto it = _cacheURL.cbegin(); it != _cacheURL.cend(); )
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{
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const auto aMessage = "search " + it->first + "\r\n";
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if (Util::writeFIFO(getChildPipe(it->second), aMessage) < 0)
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{
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Log::error("Error sending search message to child [" + std::to_string(it->second) + "]. Clearing cache.");
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_cacheURL.clear();
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break;
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}
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std::string aResponse;
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if (getResponseLine(readerChild, aResponse) < 0)
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{
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Log::error("Error reading response to thread message from child [" + std::to_string(it->second) + "]. Clearing cache.");
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_cacheURL.clear();
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break;
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}
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StringTokenizer tokens(aResponse, " ", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
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if (tokens.count() != 2 || tokens[1] != "ok")
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{
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Log::debug() << "Removed expired Kit [" << it->second << "] hosts URL [" << it->first << "]." << Log::end;
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it = _cacheURL.erase(it);
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continue;
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}
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++it;
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}
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}
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Process::PID searchURL(const std::string& aURL)
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{
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std::lock_guard<std::recursive_mutex> lock(forkMutex);
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const std::string aMessage = "search " + aURL + "\r\n";
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Process::PID nPID = -1;
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for (auto it = _childProcesses.cbegin(); it != _childProcesses.cend(); )
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{
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assert(it->first > 0 && it->second > 0);
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Log::trace("Query to kit [" + std::to_string(it->first) + "]: " + aMessage);
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ssize_t nBytes = Util::writeFIFO(it->second, aMessage);
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if ( nBytes < 0 )
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{
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Log::error("Error sending search message to child pipe: " + std::to_string(it->first) + ". Terminating.");
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removeChild(it->first);
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it = _childProcesses.cbegin();
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continue;
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}
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std::string aResponse;
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nBytes = getResponseLine(readerChild, aResponse);
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Log::trace("Response from kit [" + std::to_string(it->first) + "]: " + aResponse);
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if ( nBytes < 0 )
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{
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Log::error("Error reading response to search message from child [" + std::to_string(it->first) + "]. Terminating.");
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removeChild(it->first);
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it = _childProcesses.cbegin();
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continue;
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}
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StringTokenizer tokens(aResponse, " ", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
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if (tokens[1] == "ok")
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{
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// Found, but find all empty instances.
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nPID = it->first;
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Log::debug("Kit [" + std::to_string(nPID) + "] hosts URL [" + aURL + "].");
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break;
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}
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else if (tokens[1] == "empty")
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{
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// Remember the last empty.
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nPID = it->first;
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Log::debug("Kit [" + std::to_string(nPID) + "] is empty.");
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}
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++it;
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}
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return nPID;
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}
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void handleInput(const std::string& aMessage)
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{
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std::lock_guard<std::recursive_mutex> lock(forkMutex);
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StringTokenizer tokens(aMessage, " ", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
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if (tokens[0] == "request" && tokens.count() == 3)
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{
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const std::string aTID = tokens[1];
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const std::string aURL = tokens[2];
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Log::debug("Finding kit for URL [" + aURL + "] on thread [" + aTID + "].");
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// Check the cache first.
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const auto aIterURL = _cacheURL.find(aURL);
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if ( aIterURL != _cacheURL.end() )
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{
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Log::debug("Cache found URL [" + aURL + "] hosted on child [" + std::to_string(aIterURL->second) +
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"]. Creating view for thread [" + aTID + "].");
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if (createThread(aIterURL->second, aTID, aURL))
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return;
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Log::error("Cache: Error creating thread [" + aTID + "] for URL [" + aURL + "]. Will search.");
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}
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else
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{
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// Not found in cache, do a full search.
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Log::debug("URL [" + aURL + "] is not in cache. Will search.");
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}
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const Process::PID nPID = searchURL(aURL);
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if ( nPID > 0 )
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{
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Log::debug("Search found child [" + std::to_string(aIterURL->second) +
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"] to host URL [" + aURL +
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"]. Creating view for thread [" + aTID + "].");
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if (createThread(nPID, aTID, aURL))
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{
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_cacheURL[aURL] = nPID;
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return;
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}
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Log::error("Search: Error creating thread [" + aTID + "] for URL [" + aURL + "].");
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}
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Log::info("No children available. Creating more.");
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++forkCounter;
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}
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}
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void run() override
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{
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std::string aMessage;
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char aBuffer[READ_BUFFER_SIZE];
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char* pStart;
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char* pEnd;
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struct pollfd aPoll;
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ssize_t nBytes = -1;
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aPoll.fd = readerBroker;
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aPoll.events = POLLIN;
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aPoll.revents = 0;
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pStart = aBuffer;
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pEnd = aBuffer;
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static const std::string thread_name = "brk_pipe_reader";
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#ifdef __linux
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if (prctl(PR_SET_NAME, reinterpret_cast<unsigned long>(thread_name.c_str()), 0, 0, 0) != 0)
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Log::error("Cannot set thread name to " + thread_name + ".");
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#endif
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Log::debug("Thread [" + thread_name + "] started.");
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while (!TerminationFlag)
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{
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if ( pStart == pEnd )
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{
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if (poll(&aPoll, 1, POLL_TIMEOUT_MS) < 0)
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{
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Log::error("Failed to poll pipe [" + FIFO_FILE + "].");
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continue;
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}
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else
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if (aPoll.revents & (POLLIN | POLLPRI))
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{
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nBytes = Util::readFIFO(readerBroker, aBuffer, sizeof(aBuffer));
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if (nBytes < 0)
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{
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pStart = pEnd = nullptr;
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Log::error("Error reading message from pipe [" + FIFO_FILE + "].");
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continue;
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}
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pStart = aBuffer;
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pEnd = aBuffer + nBytes;
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}
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else
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if (aPoll.revents & (POLLERR | POLLHUP))
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{
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Log::error("Broken pipe [" + FIFO_FILE + "] with wsd.");
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break;
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}
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}
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if ( pStart != pEnd )
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{
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char aChar = *pStart++;
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while (pStart != pEnd && aChar != '\r' && aChar != '\n')
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{
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aMessage += aChar;
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aChar = *pStart++;
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}
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if ( aChar == '\r' && *pStart == '\n')
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{
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pStart++;
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Log::trace("BrokerFromMaster: " + aMessage);
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const auto duration = (std::chrono::steady_clock::now() - lastMaintenanceTime);
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if (duration >= std::chrono::seconds(10))
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{
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verifyChilds();
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lastMaintenanceTime = std::chrono::steady_clock::now();
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}
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handleInput(aMessage);
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aMessage.clear();
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}
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}
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}
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Log::debug("Thread [" + thread_name + "] finished.");
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}
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private:
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char* _pStart;
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char* _pEnd;
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char _aBuffer[READ_BUFFER_SIZE];
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};
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/// Initializes LibreOfficeKit for cross-fork re-use.
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static bool globalPreinit(const std::string &loSubPath)
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{
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void *handle;
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LokHookPreInit* preInit;
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std::string fname = "/" + loSubPath + "/program/" LIB_SOFFICEAPP;
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handle = dlopen(fname.c_str(), RTLD_GLOBAL|RTLD_NOW);
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if (!handle)
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{
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Log::warn("Failed to load " + std::string(LIB_SOFFICEAPP) + " library. Trying " + std::string(LIB_MERGED));
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fname = "/" + loSubPath + "/program/" LIB_MERGED;
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handle = dlopen(fname.c_str(), RTLD_GLOBAL|RTLD_NOW);
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if (!handle)
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{
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Log::warn("Failed to load " + std::string(LIB_MERGED) + " library.");
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return false;
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}
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}
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preInit = (LokHookPreInit *)dlsym(handle, "lok_preinit");
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if (!preInit)
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{
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Log::warn("Note: No lok_preinit hook in " + std::string(LIB_SOFFICEAPP) +
|
|
" library. Cannot fork, will execv instead.");
|
|
return false;
|
|
}
|
|
|
|
return preInit(("/" + loSubPath + "/program").c_str(), "file:///user") == 0;
|
|
}
|
|
|
|
static int createLibreOfficeKit(const bool sharePages,
|
|
const std::string& loSubPath,
|
|
const std::string& jailId)
|
|
{
|
|
Poco::UInt64 child;
|
|
int nFIFOWriter = -1;
|
|
|
|
const std::string pipe = BROKER_PREFIX + std::to_string(childCounter++) + BROKER_SUFIX;
|
|
|
|
if (mkfifo(pipe.c_str(), 0666) < 0)
|
|
{
|
|
Log::error("Error: mkfifo failed.");
|
|
return -1;
|
|
}
|
|
|
|
if (sharePages)
|
|
{
|
|
Log::debug("Forking LibreOfficeKit.");
|
|
|
|
Poco::UInt64 pid;
|
|
if (!(pid = fork()))
|
|
{
|
|
// child
|
|
lokit_main(loSubPath, jailId, pipe);
|
|
_exit(0);
|
|
}
|
|
else
|
|
{
|
|
// parent
|
|
child = pid; // (somehow - switch the hash to use real pids or ?) ...
|
|
Log::info("Forked kit [" + std::to_string(child) + "].");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Process::Args args;
|
|
args.push_back("--losubpath=" + loSubPath);
|
|
args.push_back("--jailid=" + jailId);
|
|
args.push_back("--pipe=" + pipe);
|
|
args.push_back("--clientport=" + std::to_string(ClientPortNumber));
|
|
|
|
Log::info("Launching LibreOfficeKit #" + std::to_string(childCounter) +
|
|
": " + JAILED_LOOLKIT_PATH + " " +
|
|
Poco::cat(std::string(" "), args.begin(), args.end()));
|
|
|
|
ProcessHandle procChild = Process::launch(JAILED_LOOLKIT_PATH, args);
|
|
child = procChild.id();
|
|
Log::info("Spawned kit [" + std::to_string(child) + "].");
|
|
|
|
if (!Process::isRunning(procChild))
|
|
{
|
|
// This can happen if we fail to copy it, or bad chroot etc.
|
|
Log::error("Error: loolkit [" + std::to_string(child) + "] was stillborn.");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if ( (nFIFOWriter = open(pipe.c_str(), O_WRONLY)) < 0 )
|
|
{
|
|
Log::error("Error: failed to open write pipe [" + pipe + "] with kit. Abandoning child.");
|
|
requestAbnormalTermination(child);
|
|
return -1;
|
|
}
|
|
|
|
Log::info() << "Adding Kit #" << childCounter << ", PID: " << child << Log::end;
|
|
_childProcesses[child] = nFIFOWriter;
|
|
--forkCounter;
|
|
return child;
|
|
}
|
|
|
|
static bool waitForTerminationChild(const Process::PID aPID, signed count = CHILD_TIMEOUT_SECS)
|
|
{
|
|
while (count-- > 0)
|
|
{
|
|
int status;
|
|
waitpid(aPID, &status, WUNTRACED | WNOHANG);
|
|
if (WIFEXITED(status) || WIFSIGNALED(status))
|
|
{
|
|
Log::info("Child " + std::to_string(aPID) + " terminated.");
|
|
return true;
|
|
}
|
|
|
|
sleep(MAINTENANCE_INTERVAL);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// Broker process
|
|
int main(int argc, char** argv)
|
|
{
|
|
if (std::getenv("SLEEPFORDEBUGGER"))
|
|
{
|
|
std::cerr << "Sleeping " << std::getenv("SLEEPFORDEBUGGER")
|
|
<< " seconds to attach debugger to process "
|
|
<< Process::id() << std::endl;
|
|
Thread::sleep(std::stoul(std::getenv("SLEEPFORDEBUGGER")) * 1000);
|
|
}
|
|
|
|
// Initialization
|
|
Log::initialize("brk");
|
|
|
|
Util::setSignals(false);
|
|
|
|
std::string childRoot;
|
|
std::string jailId;
|
|
std::string loSubPath;
|
|
std::string sysTemplate;
|
|
std::string loTemplate;
|
|
|
|
for (int i = 0; i < argc; ++i)
|
|
{
|
|
char *cmd = argv[i];
|
|
char *eq = nullptr;
|
|
if (strstr(cmd, "--losubpath=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
loSubPath = std::string(++eq);
|
|
}
|
|
else if (strstr(cmd, "--systemplate=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
sysTemplate = std::string(++eq);
|
|
}
|
|
else if (strstr(cmd, "--lotemplate=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
loTemplate = std::string(++eq);
|
|
}
|
|
else if (strstr(cmd, "--childroot=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
childRoot = std::string(++eq);
|
|
}
|
|
else if (strstr(cmd, "--jailid=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
jailId = std::string(++eq);
|
|
}
|
|
else if (strstr(cmd, "--numprespawns=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
numPreSpawnedChildren = std::stoi(std::string(++eq));
|
|
}
|
|
else if (strstr(cmd, "--clientport=") == cmd)
|
|
{
|
|
eq = strchrnul(cmd, '=');
|
|
if (*eq)
|
|
ClientPortNumber = std::stoll(std::string(++eq));
|
|
}
|
|
}
|
|
|
|
if (loSubPath.empty())
|
|
{
|
|
Log::error("Error: --losubpath is empty");
|
|
exit(-1);
|
|
}
|
|
|
|
if (sysTemplate.empty())
|
|
{
|
|
Log::error("Error: --losubpath is empty");
|
|
exit(-1);
|
|
}
|
|
|
|
if (loTemplate.empty())
|
|
{
|
|
Log::error("Error: --lotemplate is empty");
|
|
exit(-1);
|
|
}
|
|
|
|
if (childRoot.empty())
|
|
{
|
|
Log::error("Error: --childroot is empty");
|
|
exit(-1);
|
|
}
|
|
|
|
if (numPreSpawnedChildren < 1)
|
|
{
|
|
Log::error("Error: --numprespawns is 0");
|
|
exit(-1);
|
|
}
|
|
|
|
if ( (readerBroker = open(FIFO_FILE.c_str(), O_RDONLY) ) < 0 )
|
|
{
|
|
Log::error("Error: failed to open pipe [" + FIFO_FILE + "] read only. Exiting.");
|
|
exit(-1);
|
|
}
|
|
|
|
try
|
|
{
|
|
Poco::Environment::get("LD_BIND_NOW");
|
|
}
|
|
catch (const Poco::NotFoundException& exc)
|
|
{
|
|
Log::warn("Note: LD_BIND_NOW is not set.");
|
|
}
|
|
|
|
try
|
|
{
|
|
Poco::Environment::get("LOK_VIEW_CALLBACK");
|
|
}
|
|
catch (const Poco::NotFoundException& exc)
|
|
{
|
|
Log::warn("Note: LOK_VIEW_CALLBACK is not set.");
|
|
}
|
|
|
|
// The loolkit binary must be in our directory.
|
|
const std::string loolkitPath = Poco::Path(argv[0]).parent().toString() + "loolkit";
|
|
if (!File(loolkitPath).exists())
|
|
{
|
|
Log::error("Error: loolkit does not exists at [" + loolkitPath + "].");
|
|
exit(-1);
|
|
}
|
|
|
|
const Path jailPath = Path::forDirectory(childRoot + Path::separator() + jailId);
|
|
Log::info("Jail path: " + jailPath.toString());
|
|
|
|
File(jailPath).createDirectories();
|
|
|
|
Path jailLOInstallation(jailPath, loSubPath);
|
|
jailLOInstallation.makeDirectory();
|
|
File(jailLOInstallation).createDirectory();
|
|
|
|
// Copy (link) LO installation and other necessary files into it from the template.
|
|
linkOrCopy(sysTemplate, jailPath);
|
|
linkOrCopy(loTemplate, jailLOInstallation);
|
|
|
|
// It is necessary to deploy loolkit process to chroot jail.
|
|
File(loolkitPath).copyTo(Path(jailPath, JAILED_LOOLKIT_PATH).toString());
|
|
|
|
// We need this because sometimes the hostname is not resolved
|
|
const std::vector<std::string> networkFiles = {"/etc/host.conf", "/etc/hosts", "/etc/nsswitch.conf", "/etc/resolv.conf"};
|
|
for (const auto& filename : networkFiles)
|
|
{
|
|
const File networkFile(filename);
|
|
if (networkFile.exists())
|
|
{
|
|
networkFile.copyTo(Path(jailPath, "/etc").toString());
|
|
}
|
|
}
|
|
|
|
#ifdef __linux
|
|
// 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::error("Error: 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::error("Error: mknod(" + jailPath.toString() + "/dev/urandom) failed.");
|
|
}
|
|
#endif
|
|
|
|
Log::info("loolbroker -> chroot(\"" + jailPath.toString() + "\")");
|
|
if (chroot(jailPath.toString().c_str()) == -1)
|
|
{
|
|
Log::error("Error: chroot(\"" + jailPath.toString() + "\") failed.");
|
|
exit(-1);
|
|
}
|
|
|
|
if (chdir("/") == -1)
|
|
{
|
|
Log::error("Error: chdir(\"/\") in jail failed.");
|
|
exit(-1);
|
|
}
|
|
|
|
#ifdef __linux
|
|
dropCapability(CAP_SYS_CHROOT);
|
|
dropCapability(CAP_MKNOD);
|
|
dropCapability(CAP_FOWNER);
|
|
#else
|
|
dropCapability();
|
|
#endif
|
|
|
|
if (mkfifo(FIFO_BROKER.c_str(), 0666) == -1)
|
|
{
|
|
Log::error("Error: Failed to create pipe FIFO [" + FIFO_BROKER + "].");
|
|
exit(-1);
|
|
}
|
|
|
|
// Initialize LoKit and hope we can fork and save memory by sharing pages.
|
|
const bool sharePages = globalPreinit(loSubPath);
|
|
|
|
// We must have at least one child, more is created dynamically.
|
|
if (createLibreOfficeKit(sharePages, loSubPath, jailId) < 0)
|
|
{
|
|
Log::error("Error: failed to create children.");
|
|
exit(-1);
|
|
}
|
|
|
|
if ( (readerChild = open(FIFO_BROKER.c_str(), O_RDONLY) ) < 0 )
|
|
{
|
|
Log::error("Error: pipe opened for reading.");
|
|
exit(-1);
|
|
}
|
|
|
|
PipeRunnable pipeHandler;
|
|
Poco::Thread aPipe;
|
|
|
|
aPipe.start(pipeHandler);
|
|
|
|
Log::info("loolbroker is ready.");
|
|
|
|
unsigned timeoutCounter = 0;
|
|
while (!TerminationFlag)
|
|
{
|
|
if (forkCounter > 0)
|
|
{
|
|
std::lock_guard<std::recursive_mutex> lock(forkMutex);
|
|
|
|
pipeHandler.verifyChilds();
|
|
|
|
// Figure out how many children we need.
|
|
const signed total = _childProcesses.size();
|
|
const signed used = _cacheURL.size();
|
|
const signed extra = total - used;
|
|
signed spawn = std::min(static_cast<int>(forkCounter), numPreSpawnedChildren);
|
|
Log::debug() << "Spawning " << spawn << " children. Current Total: " << total
|
|
<< ", used: " << used << ", extra: " << extra << Log::end;
|
|
do
|
|
{
|
|
if (createLibreOfficeKit(sharePages, loSubPath, jailId) < 0)
|
|
Log::error("Error: fork failed.");
|
|
}
|
|
while (--spawn > 0);
|
|
|
|
// We've done our best. If need more, retrying will bump the counter.
|
|
forkCounter = 0;
|
|
}
|
|
|
|
int status;
|
|
const pid_t pid = waitpid(-1, &status, WUNTRACED | WNOHANG);
|
|
if (pid > 0)
|
|
{
|
|
if (WIFEXITED(status))
|
|
{
|
|
Log::info() << "Child process [" << pid << "] exited with code: "
|
|
<< WEXITSTATUS(status) << "." << Log::end;
|
|
|
|
removeChild(pid);
|
|
}
|
|
else
|
|
if (WIFSIGNALED(status))
|
|
{
|
|
std::string fate = "died";
|
|
#ifdef WCOREDUMP
|
|
if (WCOREDUMP(status))
|
|
fate = "core-dumped";
|
|
#endif
|
|
Log::error() << "Child process [" << pid << "] " << fate
|
|
<< " with " << Util::signalName(WTERMSIG(status))
|
|
<< " signal. " << Log::end;
|
|
|
|
removeChild(pid);
|
|
}
|
|
else if (WIFSTOPPED(status))
|
|
{
|
|
Log::info() << "Child process [" << pid << "] stopped with "
|
|
<< Util::signalName(WSTOPSIG(status))
|
|
<< " signal. " << Log::end;
|
|
}
|
|
else if (WIFCONTINUED(status))
|
|
{
|
|
Log::info() << "Child process [" << pid << "] resumed with SIGCONT."
|
|
<< Log::end;
|
|
}
|
|
else
|
|
{
|
|
Log::warn() << "Unknown status returned by waitpid: "
|
|
<< std::hex << status << "." << Log::end;
|
|
}
|
|
}
|
|
else if (pid < 0)
|
|
Log::error("Error: waitpid failed.");
|
|
|
|
if (timeoutCounter++ == INTERVAL_PROBES)
|
|
{
|
|
timeoutCounter = 0;
|
|
sleep(MAINTENANCE_INTERVAL);
|
|
}
|
|
}
|
|
|
|
// Terminate child processes
|
|
for (auto& it : _childProcesses)
|
|
{
|
|
Log::info("Requesting child process " + std::to_string(it.first) + " to terminate.");
|
|
Process::requestTermination(it.first);
|
|
}
|
|
|
|
// Wait and kill child processes
|
|
for (auto& it : _childProcesses)
|
|
{
|
|
if (!waitForTerminationChild(it.first))
|
|
{
|
|
Log::info("Forcing child process " + std::to_string(it.first) + " to terminate.");
|
|
Process::kill(it.first);
|
|
}
|
|
|
|
// Close the write pipe.
|
|
close(it.second);
|
|
}
|
|
|
|
aPipe.join();
|
|
close(readerChild);
|
|
close(readerBroker);
|
|
|
|
Log::info("Process [loolbroker] finished.");
|
|
return 0;
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|