116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "otautil/DirUtil.h"
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#include <dirent.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string>
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#include <selinux/label.h>
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#include <selinux/selinux.h>
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enum class DirStatus { DMISSING, DDIR, DILLEGAL };
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static DirStatus dir_status(const std::string& path) {
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struct stat sb;
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if (stat(path.c_str(), &sb) == 0) {
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// Something's there; make sure it's a directory.
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if (S_ISDIR(sb.st_mode)) {
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return DirStatus::DDIR;
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}
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errno = ENOTDIR;
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return DirStatus::DILLEGAL;
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} else if (errno != ENOENT) {
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// Something went wrong, or something in the path is bad. Can't do anything in this situation.
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return DirStatus::DILLEGAL;
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}
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return DirStatus::DMISSING;
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}
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int mkdir_recursively(const std::string& input_path, mode_t mode, bool strip_filename,
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const selabel_handle* sehnd) {
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// Check for an empty string before we bother making any syscalls.
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if (input_path.empty()) {
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errno = ENOENT;
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return -1;
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}
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// Allocate a path that we can modify; stick a slash on the end to make things easier.
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std::string path = input_path;
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if (strip_filename) {
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// Strip everything after the last slash.
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size_t pos = path.rfind('/');
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if (pos == std::string::npos) {
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errno = ENOENT;
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return -1;
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}
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path.resize(pos + 1);
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} else {
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// Make sure that the path ends in a slash.
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path.push_back('/');
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}
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// See if it already exists.
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DirStatus ds = dir_status(path);
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if (ds == DirStatus::DDIR) {
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return 0;
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} else if (ds == DirStatus::DILLEGAL) {
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return -1;
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}
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// Walk up the path from the root and make each level.
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size_t prev_end = 0;
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while (prev_end < path.size()) {
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size_t next_end = path.find('/', prev_end + 1);
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if (next_end == std::string::npos) {
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break;
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}
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std::string dir_path = path.substr(0, next_end);
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// Check this part of the path and make a new directory if necessary.
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switch (dir_status(dir_path)) {
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case DirStatus::DILLEGAL:
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// Could happen if some other process/thread is messing with the filesystem.
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return -1;
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case DirStatus::DMISSING: {
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char* secontext = nullptr;
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if (sehnd) {
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selabel_lookup(const_cast<selabel_handle*>(sehnd), &secontext, dir_path.c_str(), mode);
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setfscreatecon(secontext);
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}
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int err = mkdir(dir_path.c_str(), mode);
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if (secontext) {
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freecon(secontext);
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setfscreatecon(nullptr);
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}
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if (err != 0) {
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return -1;
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}
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break;
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}
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default:
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// Already exists.
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break;
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}
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prev_end = next_end;
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}
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return 0;
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}
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