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/*
* Copyright (C) 2014 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 <ftw.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "TemporaryFile.h"
#include <android-base/stringprintf.h>
#include <gtest/gtest.h>
static void MakeTree(const char* root) {
char path[PATH_MAX];
snprintf(path, sizeof(path), "%s/dir", root);
ASSERT_EQ(0, mkdir(path, 0755)) << path;
snprintf(path, sizeof(path), "%s/dir/sub", root);
ASSERT_EQ(0, mkdir(path, 0555)) << path;
snprintf(path, sizeof(path), "%s/unreadable-dir", root);
ASSERT_EQ(0, mkdir(path, 0000)) << path;
snprintf(path, sizeof(path), "%s/dangler", root);
ASSERT_EQ(0, symlink("/does-not-exist", path));
snprintf(path, sizeof(path), "%s/symlink", root);
ASSERT_EQ(0, symlink("dir/sub", path));
int fd;
snprintf(path, sizeof(path), "%s/regular", root);
ASSERT_NE(-1, fd = open(path, O_CREAT|O_TRUNC, 0666));
ASSERT_EQ(0, close(fd));
}
void sanity_check_ftw(const char* fpath, const struct stat* sb, int tflag) {
ASSERT_TRUE(fpath != NULL);
ASSERT_TRUE(sb != NULL);
// Was it a case where the struct stat we're given is meaningless?
if (tflag == FTW_NS || tflag == FTW_SLN) {
// If so, double-check that we really can't stat.
struct stat sb;
EXPECT_EQ(-1, stat(fpath, &sb));
return;
}
// Otherwise check that the struct stat matches the type flag.
if (S_ISDIR(sb->st_mode)) {
if (access(fpath, R_OK) == 0) {
EXPECT_TRUE(tflag == FTW_D || tflag == FTW_DP) << fpath << ' ' << tflag;
} else {
EXPECT_EQ(FTW_DNR, tflag) << fpath;
}
} else if (S_ISLNK(sb->st_mode)) {
EXPECT_EQ(FTW_SL, tflag) << fpath;
} else {
EXPECT_EQ(FTW_F, tflag) << fpath;
}
}
void sanity_check_nftw(const char* fpath, const struct stat* sb, int tflag, FTW* ftwbuf) {
sanity_check_ftw(fpath, sb, tflag);
ASSERT_EQ('/', fpath[ftwbuf->base - 1]) << fpath;
}
int check_ftw(const char* fpath, const struct stat* sb, int tflag) {
sanity_check_ftw(fpath, sb, tflag);
return 0;
}
int check_ftw64(const char* fpath, const struct stat64* sb, int tflag) {
sanity_check_ftw(fpath, reinterpret_cast<const struct stat*>(sb), tflag);
return 0;
}
int check_nftw(const char* fpath, const struct stat* sb, int tflag, FTW* ftwbuf) {
sanity_check_nftw(fpath, sb, tflag, ftwbuf);
return 0;
}
int check_nftw64(const char* fpath, const struct stat64* sb, int tflag, FTW* ftwbuf) {
sanity_check_nftw(fpath, reinterpret_cast<const struct stat*>(sb), tflag, ftwbuf);
return 0;
}
TEST(ftw, ftw) {
TemporaryDir root;
MakeTree(root.dirname);
ASSERT_EQ(0, ftw(root.dirname, check_ftw, 128));
}
TEST(ftw, ftw64) {
TemporaryDir root;
MakeTree(root.dirname);
ASSERT_EQ(0, ftw64(root.dirname, check_ftw64, 128));
}
TEST(ftw, nftw) {
TemporaryDir root;
MakeTree(root.dirname);
ASSERT_EQ(0, nftw(root.dirname, check_nftw, 128, 0));
}
TEST(ftw, nftw64) {
TemporaryDir root;
MakeTree(root.dirname);
ASSERT_EQ(0, nftw64(root.dirname, check_nftw64, 128, 0));
}
template <typename StatT>
static int bug_28197840_ftw(const char* path, const StatT*, int flag) {
EXPECT_EQ(strstr(path, "unreadable") != nullptr ? FTW_DNR : FTW_D, flag) << path;
return 0;
}
template <typename StatT>
static int bug_28197840_nftw(const char* path, const StatT* sb, int flag, FTW*) {
return bug_28197840_ftw(path, sb, flag);
}
TEST(ftw, bug_28197840) {
// Drop root for this test, because root can still read directories even if
// permissions would imply otherwise.
if (getuid() == 0) {
passwd* pwd = getpwnam("shell");
ASSERT_EQ(0, setuid(pwd->pw_uid));
}
TemporaryDir root;
std::string path = android::base::StringPrintf("%s/unreadable-directory", root.dirname);
ASSERT_EQ(0, mkdir(path.c_str(), 0000)) << path;
ASSERT_EQ(0, ftw(root.dirname, bug_28197840_ftw<struct stat>, 128));
ASSERT_EQ(0, ftw64(root.dirname, bug_28197840_ftw<struct stat64>, 128));
ASSERT_EQ(0, nftw(root.dirname, bug_28197840_nftw<struct stat>, 128, FTW_PHYS));
ASSERT_EQ(0, nftw64(root.dirname, bug_28197840_nftw<struct stat64>, 128, FTW_PHYS));
}
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