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/*
* Copyright (C) 2016 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 "ZipUtil.h"
#include <errno.h>
#include <fcntl.h>
#include <utime.h>
#include <string>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
#include <ziparchive/zip_archive.h>
#include "DirUtil.h"
static constexpr mode_t UNZIP_DIRMODE = 0755;
static constexpr mode_t UNZIP_FILEMODE = 0644;
bool ExtractPackageRecursive(ZipArchiveHandle zip, const std::string& zip_path,
const std::string& dest_path, const struct utimbuf* timestamp,
struct selabel_handle* sehnd) {
if (!zip_path.empty() && zip_path[0] == '/') {
LOG(ERROR) << "ExtractPackageRecursive(): zip_path must be a relative path " << zip_path;
return false;
}
if (dest_path.empty() || dest_path[0] != '/') {
LOG(ERROR) << "ExtractPackageRecursive(): dest_path must be an absolute path " << dest_path;
return false;
}
void* cookie;
std::string target_dir(dest_path);
if (dest_path.back() != '/') {
target_dir += '/';
}
std::string prefix_path(zip_path);
if (!zip_path.empty() && zip_path.back() != '/') {
prefix_path += '/';
}
const ZipString zip_prefix(prefix_path.c_str());
int ret = StartIteration(zip, &cookie, &zip_prefix, nullptr);
if (ret != 0) {
LOG(ERROR) << "failed to start iterating zip entries.";
return false;
}
std::unique_ptr<void, decltype(&EndIteration)> guard(cookie, EndIteration);
ZipEntry entry;
ZipString name;
int extractCount = 0;
while (Next(cookie, &entry, &name) == 0) {
std::string entry_name(name.name, name.name + name.name_length);
CHECK_LE(prefix_path.size(), entry_name.size());
std::string path = target_dir + entry_name.substr(prefix_path.size());
// Skip dir.
if (path.back() == '/') {
continue;
}
//TODO(b/31917448) handle the symlink.
if (dirCreateHierarchy(path.c_str(), UNZIP_DIRMODE, timestamp, true, sehnd) != 0) {
LOG(ERROR) << "failed to create dir for " << path;
return false;
}
char *secontext = NULL;
if (sehnd) {
selabel_lookup(sehnd, &secontext, path.c_str(), UNZIP_FILEMODE);
setfscreatecon(secontext);
}
android::base::unique_fd fd(open(path.c_str(), O_CREAT|O_WRONLY|O_TRUNC, UNZIP_FILEMODE));
if (fd == -1) {
PLOG(ERROR) << "Can't create target file \"" << path << "\"";
return false;
}
if (secontext) {
freecon(secontext);
setfscreatecon(NULL);
}
int err = ExtractEntryToFile(zip, &entry, fd);
if (err != 0) {
LOG(ERROR) << "Error extracting \"" << path << "\" : " << ErrorCodeString(err);
return false;
}
if (fsync(fd) != 0) {
PLOG(ERROR) << "Error syncing file descriptor when extracting \"" << path << "\"";
return false;
}
if (timestamp != nullptr && utime(path.c_str(), timestamp)) {
PLOG(ERROR) << "Error touching \"" << path << "\"";
return false;
}
LOG(INFO) << "Extracted file \"" << path << "\"";
++extractCount;
}
LOG(INFO) << "Extracted " << extractCount << " file(s)";
return true;
}
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