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/** @file
This file contains code for class to allow management of configuration files
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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 "tscore/ink_platform.h"
#include "tscore/ink_memory.h"
#include "tscore/ink_time.h"
#include "Alarms.h"
#include "LocalManager.h"
#include "ConfigManager.h"
#include "WebMgmtUtils.h"
#include "ExpandingArray.h"
#include "MgmtSocket.h"
#include "tscore/I_Layout.h"
#include "FileManager.h"
#include "ProxyConfig.h"
#if HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC
#define TS_ARCHIVE_STAT_MTIME(t) ((t).st_mtime * 1000000000 + (t).st_mtimespec.tv_nsec)
#elif HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
#define TS_ARCHIVE_STAT_MTIME(t) ((t).st_mtime * 1000000000 + (t).st_mtim.tv_nsec)
#else
#define TS_ARCHIVE_STAT_MTIME(t) ((t).st_mtime * 1000000000)
#endif
ConfigManager::ConfigManager(const char *fileName_, const char *configName_, bool root_access_needed_, bool isRequired_,
ConfigManager *parentConfig_)
: root_access_needed(root_access_needed_), isRequired(isRequired_), parentConfig(parentConfig_)
{
ExpandingArray existVer(25, true); // Existing versions
struct stat fileInfo;
ink_assert(fileName_ != nullptr);
// parent must not also have a parent
if (parentConfig) {
ink_assert(parentConfig->parentConfig == nullptr);
}
// Copy the file name.
fileName = std::string{fileName_};
configName = std::string{configName_};
ink_mutex_init(&fileAccessLock);
// Check to make sure that our configuration file exists
//
if (statFile(&fileInfo) < 0) {
mgmt_log("[ConfigManager::ConfigManager] %s Unable to load: %s", fileName.c_str(), strerror(errno));
if (isRequired) {
mgmt_fatal(0, "[ConfigManager::ConfigManager] Unable to open required configuration file %s.\n\tStat failed : %s\n",
fileName.c_str(), strerror(errno));
}
} else {
fileLastModified = TS_ARCHIVE_STAT_MTIME(fileInfo);
}
}
//
//
// int ConfigManager::statFile()
//
// A wrapper for stat()
//
int
ConfigManager::statFile(struct stat *buf)
{
int statResult;
std::string sysconfdir(RecConfigReadConfigDir());
std::string filePath = Layout::get()->relative_to(sysconfdir, fileName);
statResult = root_access_needed ? elevating_stat(filePath.c_str(), buf) : stat(filePath.c_str(), buf);
return statResult;
}
// bool ConfigManager::checkForUserUpdate(RollBackCheckType how)
//
// Called to check if the file has been changed by the user.
// Timestamps are compared to see if a change occurred
bool
ConfigManager::checkForUserUpdate(RollBackCheckType how)
{
struct stat fileInfo;
bool result;
ink_mutex_acquire(&fileAccessLock);
if (this->statFile(&fileInfo) < 0) {
ink_mutex_release(&fileAccessLock);
return false;
}
if (fileLastModified < TS_ARCHIVE_STAT_MTIME(fileInfo)) {
if (how == ROLLBACK_CHECK_AND_UPDATE) {
fileLastModified = TS_ARCHIVE_STAT_MTIME(fileInfo);
if (!this->isChildManaged()) {
configFiles->fileChanged(fileName.c_str(), configName.c_str());
}
mgmt_log("User has changed config file %s\n", fileName.c_str());
}
result = true;
} else {
result = false;
}
ink_mutex_release(&fileAccessLock);
return result;
}
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