blob: e2883ba0450801a6c74d30ec4226c406fa6a318c [file] [log] [blame]
/*
* 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.
*/
#define DEBUG false
#include "Log.h"
#include "report_directory.h"
#include <private/android_filesystem_config.h>
#include <utils/String8.h>
#include <dirent.h>
#include <libgen.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
namespace android {
namespace os {
namespace incidentd {
status_t create_directory(const char* directory) {
struct stat st;
status_t err = NO_ERROR;
char* dir = strdup(directory);
// Skip first slash
char* d = dir + 1;
// Create directories, assigning them to the system user
bool last = false;
while (!last) {
d = strchr(d, '/');
if (d != NULL) {
*d = '\0';
} else {
last = true;
}
if (stat(dir, &st) == 0) {
if (!S_ISDIR(st.st_mode)) {
err = ALREADY_EXISTS;
goto done;
}
} else {
ALOGE("No such directory %s, something wrong.", dir);
err = -1;
goto done;
}
if (!last) {
*d++ = '/';
}
}
// Ensure that the final directory is owned by the system with 0770. If it isn't
// we won't write into it.
if (stat(directory, &st) != 0) {
ALOGE("No incident reports today. Can't stat: %s", directory);
err = -errno;
goto done;
}
if ((st.st_mode & 0777) != 0770) {
ALOGE("No incident reports today. Mode is %0o on report directory %s", st.st_mode,
directory);
err = BAD_VALUE;
goto done;
}
if (st.st_uid != AID_INCIDENTD || st.st_gid != AID_INCIDENTD) {
ALOGE("No incident reports today. Owner is %d and group is %d on report directory %s",
st.st_uid, st.st_gid, directory);
err = BAD_VALUE;
goto done;
}
done:
free(dir);
return err;
}
static bool stat_mtime_cmp(const std::pair<String8, struct stat>& a,
const std::pair<String8, struct stat>& b) {
return a.second.st_mtime < b.second.st_mtime;
}
void clean_directory(const char* directory, off_t maxSize, size_t maxCount) {
DIR* dir;
struct dirent* entry;
struct stat st;
std::vector<std::pair<String8, struct stat>> files;
if ((dir = opendir(directory)) == NULL) {
ALOGE("Couldn't open incident directory: %s", directory);
return;
}
String8 dirbase(directory);
if (directory[dirbase.size() - 1] != '/') dirbase += "/";
off_t totalSize = 0;
size_t totalCount = 0;
// Enumerate, count and add up size
while ((entry = readdir(dir)) != NULL) {
if (entry->d_name[0] == '.') {
continue;
}
String8 filename = dirbase + entry->d_name;
if (stat(filename.string(), &st) != 0) {
ALOGE("Unable to stat file %s", filename.string());
continue;
}
if (!S_ISREG(st.st_mode)) {
continue;
}
files.push_back(std::pair<String8, struct stat>(filename, st));
totalSize += st.st_size;
totalCount++;
}
closedir(dir);
// Count or size is less than max, then we're done.
if (totalSize < maxSize && totalCount < maxCount) {
return;
}
// Oldest files first.
sort(files.begin(), files.end(), stat_mtime_cmp);
// Remove files until we're under our limits.
for (std::vector<std::pair<String8, struct stat>>::iterator it = files.begin();
it != files.end() && totalSize >= maxSize && totalCount >= maxCount; it++) {
remove(it->first.string());
totalSize -= it->second.st_size;
totalCount--;
}
}
} // namespace incidentd
} // namespace os
} // namespace android