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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <pthread.h>
#include <sys/inotify.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <atomic>
#include <map>
#include <mutex>
#include <string>
#include <thread>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <packagelistparser/packagelistparser.h>
#include "LogUtils.h"
using android::base::unique_fd;
#define PACKAGES_LIST_FILE "/data/system/packages.list"
struct PkgIdMap {
bool active = false;
std::mutex lock;
std::atomic<bool> running = false;
std::map<uid_t, std::string> appid_to_package;
std::unique_ptr<std::thread> pklp_thread;
};
static PkgIdMap* gPkgIdMap = new PkgIdMap;
static bool PackageParseCallback(pkg_info* info, void* userdata) {
struct PkgIdMap* global = static_cast<struct PkgIdMap*>(userdata);
if (info->name != NULL && info->name[0] != '\0') {
global->appid_to_package.emplace(info->uid, info->name);
}
packagelist_free(info);
return true;
}
static bool ReadPackageList(struct PkgIdMap* global) {
std::lock_guard<std::mutex> guard(global->lock);
global->appid_to_package.clear();
bool rc = packagelist_parse(PackageParseCallback, global);
LOG(INFO) << "ReadPackageList, total packages: " << global->appid_to_package.size();
return rc;
}
static void WatchPackageList(struct PkgIdMap* global) {
struct inotify_event* event;
char event_buf[512];
unique_fd nfd(inotify_init1(IN_CLOEXEC));
if (nfd == -1) {
LOG(FATAL) << "inotify_init failed";
return;
}
global->active = false;
while (1) {
if (!global->active) {
LOG(INFO) << "start watching " PACKAGES_LIST_FILE " ...";
int ret = inotify_add_watch(nfd, PACKAGES_LIST_FILE, IN_DELETE_SELF);
if (ret == -1) {
if (errno == ENOENT || errno == EACCES) {
LOG(INFO) << "missing " PACKAGES_LIST_FILE "; retrying...";
return;
} else {
PLOG(ERROR) << "inotify_add_watch failed";
return;
}
}
if (ReadPackageList(global) == false) {
LOG(ERROR) << "ReadPackageList failed";
return;
}
global->active = true;
}
int event_pos = 0;
ssize_t res = TEMP_FAILURE_RETRY(read(nfd, event_buf, sizeof(event_buf)));
if (res == -1 || static_cast<size_t>(res) < sizeof(*event)) {
LOG(ERROR) << "failed to read inotify event, res: " << res;
global->active = false;
continue;
}
while (res >= static_cast<ssize_t>(sizeof(*event))) {
int event_size;
event = reinterpret_cast<struct inotify_event*>(event_buf + event_pos);
if ((event->mask & IN_IGNORED) == IN_IGNORED) {
global->active = false;
}
event_size = sizeof(*event) + event->len;
res -= event_size;
event_pos += event_size;
}
}
}
static void StartHandler(struct PkgIdMap* global) {
prctl(PR_SET_NAME, "logd.pkglist");
WatchPackageList(global);
global->running = false;
}
void StartPkgMonitor() {
std::lock_guard<std::mutex> guard(gPkgIdMap->lock);
if (gPkgIdMap->pklp_thread.get() == nullptr) {
gPkgIdMap->running = true;
gPkgIdMap->pklp_thread = std::make_unique<std::thread>(StartHandler, gPkgIdMap);
} else if (!gPkgIdMap->running) {
gPkgIdMap->pklp_thread->join();
gPkgIdMap->running = true;
gPkgIdMap->pklp_thread.reset(new std::thread(StartHandler, gPkgIdMap));
}
}
char* android::uidToName(uid_t u) {
{
std::lock_guard<std::mutex> guard(gPkgIdMap->lock);
if (gPkgIdMap->active) {
const auto& iter = gPkgIdMap->appid_to_package.find(u);
if (iter != gPkgIdMap->appid_to_package.end()) {
return strdup(iter->second.c_str());
}
}
}
struct Userdata {
uid_t uid;
char* name;
} userdata = {
.uid = u,
.name = nullptr,
};
packagelist_parse(
[](pkg_info* info, void* callback_parameter) {
auto userdata = reinterpret_cast<Userdata*>(callback_parameter);
bool result = true;
if (info->uid == userdata->uid) {
userdata->name = strdup(info->name);
// false to stop processing
result = false;
}
packagelist_free(info);
return result;
},
&userdata);
if (userdata.name != nullptr) {
StartPkgMonitor();
}
return userdata.name;
}
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