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// Copyright 2021 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include "ProcessResolver.h"
#include <cstring>
ProcessResolver::ProcessResolver(bool resolveImmediately)
: m_processNames(),
m_processPIDs() {
if (resolveImmediately) {
resolve();
}
}
ProcessResolver::~ProcessResolver() {
freeAndClearData();
}
void ProcessResolver::freeAndClearData() {
// delete all names
foreach(const char *currentName, m_processNames) {
delete currentName;
}
m_processNames.clear();
m_processPIDs.clear();
}
const QVector<const char*>& ProcessResolver::getProcessNames() const {
return m_processNames;
}
const QVector<uint64_t>& ProcessResolver::getProcessPIDs() const {
return m_processPIDs;
}
void ProcessResolver::resolve() {
// first clear the current lists
freeAndClearData();
doResolve();
}
size_t ProcessResolver::amountOfProcesses() const {
return m_processPIDs.size();
}
/// Helper function to add a name stored as a stack-variable to the given vector
///
/// @param stackName The pointer to the stack-variable
/// @param destVec The destination vector to add the pointer to
void addName(const char *stackName, QVector<const char*>& destVec) {
// We can't store the pointer of a stack-variable (will be invalid as soon as we exit scope)
// so we'll have to allocate memory on the heap and copy the name there.
size_t nameLength = std::strlen(stackName) + 1; // +1 for terminating NULL-byte
char *name = new char[nameLength];
std::strcpy(name, stackName);
destVec.append(name);
}
// The implementation of the doResolve-function is platfrom-dependent
// The different implementations are heavily inspired by the ones given at https://github.com/davidebeatrici/list-processes
#ifdef Q_OS_WIN
// Implementation for Windows
#ifndef UNICODE
#define UNICODE
#endif
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <tlhelp32.h>
#include <limits>
bool utf16ToUtf8(const wchar_t *source, const int size, char *destination) {
if (!WideCharToMultiByte(CP_UTF8, 0, source, -1, destination, size, NULL, NULL)) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: WideCharToMultiByte() failed with error %d\n", GetLastError());
#endif
return false;
}
return true;
}
void ProcessResolver::doResolve() {
HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnap == INVALID_HANDLE_VALUE) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: CreateToolhelp32Snapshot() failed with error %d", GetLastError());
#endif
return;
}
PROCESSENTRY32 pe;
pe.dwSize = sizeof(pe);
BOOL ok = Process32First(hSnap, &pe);
if (!ok) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: Process32First() failed with error %d\n", GetLastError());
#endif
return;
}
char name[MAX_PATH];
while (ok) {
if (utf16ToUtf8(pe.szExeFile, sizeof(name), name)) {
// Store name
addName(name, m_processNames);
// Store corresponding PID
m_processPIDs.append(pe.th32ProcessID);
}
#ifndef QT_NO_DEBUG
else {
qWarning("ProcessResolver: utf16ToUtf8() failed, skipping entry...");
}
#endif
ok = Process32Next(hSnap, &pe);
}
CloseHandle(hSnap);
}
#elif defined(Q_OS_LINUX)
// Implementation for Linux
#include <QtCore/QFile>
#include <QtCore/QDir>
#include <QtCore/QStringList>
#include <QtCore/QFileInfo>
#include <QtCore/QByteArray>
#include <QtCore/QString>
static constexpr const char *PROC_DIR = "/proc/";
void ProcessResolver::doResolve() {
QDir procDir(QString::fromLatin1(PROC_DIR));
QStringList entries = procDir.entryList();
bool ok;
foreach(const QString& currentEntry, entries) {
uint64_t pid = static_cast<unsigned long long int>(currentEntry.toLongLong(&ok, 10));
if (!ok) {
continue;
}
QString exe = QFile::symLinkTarget(QString::fromLatin1(PROC_DIR) + currentEntry + QString::fromLatin1("/exe"));
QFileInfo fi(exe);
QString firstPart = fi.baseName();
QString completeSuffix = fi.completeSuffix();
QString baseName;
if (completeSuffix.isEmpty()) {
baseName = firstPart;
} else {
baseName = firstPart + QLatin1String(".") + completeSuffix;
}
if (baseName == QLatin1String("wine-preloader") || baseName == QLatin1String("wine64-preloader")) {
QFile f(QString::fromLatin1(PROC_DIR) + currentEntry + QString::fromLatin1("/cmdline"));
if (f.open(QIODevice::ReadOnly)) {
QByteArray cmdline = f.readAll();
f.close();
int nul = cmdline.indexOf('\0');
if (nul != -1) {
cmdline.truncate(nul);
}
QString exe = QString::fromUtf8(cmdline);
if (exe.contains(QLatin1String("\\"))) {
int lastBackslash = exe.lastIndexOf(QLatin1String("\\"));
if (exe.count() > lastBackslash + 1) {
baseName = exe.mid(lastBackslash + 1);
}
}
}
}
if (!baseName.isEmpty()) {
// add name
addName(baseName.toUtf8().data(), m_processNames);
// add corresponding PID
m_processPIDs.append(pid);
}
}
}
#elif defined(Q_OS_MACOS)
// Implementation for MacOS
// Code taken from https://stackoverflow.com/questions/49506579/how-to-find-the-pid-of-any-process-in-mac-osx-c
#include <libproc.h>
void ProcessResolver::doResolve() {
pid_t pids[2048];
int bytes = proc_listpids(PROC_ALL_PIDS, 0, pids, sizeof(pids));
int n_proc = bytes / sizeof(pids[0]);
for (int i = 0; i < n_proc; i++) {
struct proc_bsdinfo proc;
int st = proc_pidinfo(pids[i], PROC_PIDTBSDINFO, 0,
&proc, PROC_PIDTBSDINFO_SIZE);
if (st == PROC_PIDTBSDINFO_SIZE) {
// add name
addName(proc.pbi_name, m_processNames);
// add corresponding PID
m_processPIDs.append(pids[i]);
}
}
}
#elif defined(Q_OS_FREEBSD)
// Implementation for FreeBSD
#include <libutil.h>
#include <sys/types.h>
#include <sys/user.h>
void ProcessResolver::doResolve() {
int n_procs;
struct kinfo_proc *procs_info = kinfo_getallproc(&n_procs);
if (!procs_info) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: kinfo_getallproc() failed\n");
#endif
return;
}
for (int i = 0; i < n_procs; ++i) {
// Add name
addName(procs_info[i].ki_comm, m_processNames);
// Add corresponding PID
m_processPIDs.append(procs_info[i].ki_pid);
}
free(procs_info);
}
#elif defined(Q_OS_BSD4)
// Implementation of generic BSD other than FreeBSD
#include <limits.h>
#include <fcntl.h>
#include <kvm.h>
#include <paths.h>
#include <sys/sysctl.h>
#include <sys/user.h>
bool kvm_cleanup(kvm_t *kd) {
if (kvm_close(kd) == -1) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: kvm_close() failed with error %d\n", errno);
#endif
return false;
}
return true;
}
void ProcessResolver::doResolve() {
char error[_POSIX2_LINE_MAX];
#ifdef KVM_NO_FILES
kvm_t *kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, error);
#else
kvm_t *kd = kvm_openfiles(NULL, _PATH_DEVNULL, NULL, O_RDONLY, error);
#endif
if (!kd) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: kvm_open2() failed with error: %s\n", error);
#endif
return;
}
int n_procs;
struct kinfo_proc *procs_info = kvm_getprocs(kd, KERN_PROC_PROC, 0, &n_procs);
if (!procs_info) {
#ifndef QT_NO_DEBUG
qCritical("ProcessResolver: kvm_getprocs() failed\n");
#endif
kvm_cleanup(kd);
return;
}
for (int i = 0; i < n_procs; ++i) {
// Add name
addName(procs_info[i].ki_comm, m_processNames);
// Add corresponding PIDs
m_processPIDs.append(procs_info[i].ki_pid);
}
kvm_cleanup(kd);
}
#else
#error "No implementation of ProcessResolver::resolve() available for this operating system"
#endif
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