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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2022 Gothel Software e.K.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef DBT_UTILS_HPP_
#define DBT_UTILS_HPP_
#include <cstring>
#include <string>
#include <memory>
#include <cstdint>
#include <cstdio>
#include "dbt_constants.hpp"
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
class file_stats {
private:
std::string fname_;
bool access_, exists_, is_link_, is_file_, is_dir_;
int errno_res_;
public:
file_stats(const std::string& fname, const bool use_lstat=true) noexcept
: fname_(fname), access_(true), exists_(true),
is_link_(false), is_file_(false), is_dir_(false),
errno_res_(0)
{
struct stat s;
int stat_res;
if( use_lstat ) {
stat_res = ::lstat(fname.c_str(), &s);
} else {
stat_res = ::stat(fname.c_str(), &s);
}
if( 0 != stat_res ) {
switch( errno ) {
case EACCES:
access_ = false;
break;
case ENOENT:
exists_ = false;
break;
default:
break;
}
if( access_ && exists_ ) {
errno_res_ = errno;
}
} else {
is_link_ = S_ISLNK( s.st_mode );
is_file_ = S_ISREG( s.st_mode );
is_dir_ = S_ISDIR( s.st_mode );
}
}
int errno_res() const noexcept { return errno_res_; }
bool ok() const noexcept { return 0 == errno_res_; }
bool has_access() const noexcept { return access_; }
bool exists() const noexcept { return exists_; }
bool is_link() const noexcept { return is_link_; }
bool is_file() const noexcept { return is_file_; }
bool is_dir() const noexcept { return is_dir_; }
std::string to_string() const noexcept {
const std::string e = 0 != errno_res_ ? ", "+std::string(::strerror(errno_res_)) : "";
return "stat['"+fname_+"', access "+std::to_string(access_)+", exists "+std::to_string(exists_)+
", link "+std::to_string(is_link_)+", file "+std::to_string(is_file_)+
", dir "+std::to_string(is_dir_)+", errno "+std::to_string(errno_res_)+e+"]";
}
};
class file_utils {
public:
static bool mkdir(const std::string& name) {
file_stats fstats(name);
if( !fstats.ok() ) {
jau::fprintf_td(stderr, "mkdir stat failed: %s\n", fstats.to_string().c_str());
return false;
}
if( fstats.is_dir() ) {
jau::fprintf_td(stderr, "mkdir failed: %s, dir already exists\n", fstats.to_string().c_str());
return true;
} else if( !fstats.exists() ) {
const int dir_err = ::mkdir(name.c_str(), S_IRWXU | S_IRWXG ); // excluding others
if ( 0 != dir_err ) {
jau::fprintf_td(stderr, "mkdir failed: %s, errno %d (%s)\n", fstats.to_string().c_str(), errno, strerror(errno));
return false;
} else {
return true;
}
} else {
jau::fprintf_td(stderr, "mkdir failed: %s, exists but is no dir\n", fstats.to_string().c_str());
return false;
}
}
static std::vector<std::string> get_file_list(const std::string& dname) {
std::vector<std::string> res;
DIR *dir;
struct dirent *ent;
if( ( dir = ::opendir( dname.c_str() ) ) != nullptr ) {
while ( ( ent = ::readdir( dir ) ) != NULL ) {
std::string fname( ent->d_name );
if( "." != fname && ".." != fname ) { // avoid '.' and '..'
res.push_back( dname + "/" + fname ); // full path
}
}
::closedir (dir);
} else {
// could not open directory
file_stats fstats(dname);
jau::fprintf_td(stderr, "get_file_list failed: %s, errno %d (%s)\n",
fstats.to_string().c_str(), errno, strerror(errno));
}
return res;
}
/**
*
* @param file
* @param recursive
* @return true only if the file or the directory with content has been deleted, otherwise false
*/
static bool remove(const std::string& file, const bool recursive) {
file_stats fstats_parent(file);
bool rm_parent = true;
if( fstats_parent.is_dir() ) {
std::vector<std::string> contents = get_file_list(file);
if ( contents.size() > 0 ) {
for (const std::string& f : contents) {
file_stats fstats(f);
if( !fstats.ok() ) {
jau::fprintf_td(stderr, "remove: stat failed: %s\n", fstats.to_string().c_str());
return false;
}
if( !fstats.exists() ) {
jau::fprintf_td(stderr, "remove: listed entity not existing: %s\n", fstats.to_string().c_str());
// try to continue ..
} else if( fstats.is_link() ) {
jau::fprintf_td(stderr, "remove: listed entity is link (drop): %s\n", fstats.to_string().c_str());
} else if( fstats.is_dir() ) {
if( recursive ) {
rm_parent = remove(f, true) && rm_parent;
} else {
// can't empty contents -> can't rm 'file'
rm_parent = false;
}
} else if( fstats.is_file() ) {
const int res = ::remove( f.c_str() );
rm_parent = 0 == res && rm_parent;
if( 0 != res ) {
jau::fprintf_td(stderr, "remove.1 failed: %s, res %d, errno %d (%s)\n",
fstats.to_string().c_str(), res, errno, strerror(errno));
}
}
}
}
}
if( rm_parent ) {
const int res = ::remove( file.c_str() );
if( 0 != res ) {
jau::fprintf_td(stderr, "remove.2 failed: %s, res %d, errno %d (%s)\n",
fstats_parent.to_string().c_str(), res, errno, strerror(errno));
}
return 0 == res;
}
return false;
}
};
class DBTUtils {
public:
static bool mkdirKeyFolder() {
if( file_utils::mkdir( DBTConstants::CLIENT_KEY_PATH ) ) {
if( file_utils::mkdir( DBTConstants::SERVER_KEY_PATH ) ) {
return true;
}
}
return false;
}
static bool rmKeyFolder() {
if( file_utils::remove( DBTConstants::CLIENT_KEY_PATH, true ) ) {
if( file_utils::remove( DBTConstants::SERVER_KEY_PATH, true ) ) {
return true;
}
}
return false;
}
};
#endif /* DBT_UTILS_HPP_ */
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