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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* 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 _PASSENGER_SYSTEM_TOOLS_USER_DATABASE_H_
#define _PASSENGER_SYSTEM_TOOLS_USER_DATABASE_H_
/*
* Utility functions for looking up OS user and group accounts.
* Wraps the getpwnam/getpwuid/getgrnam/getgrgid family of functions.
* We're wrapping them because that family of functions's associated error
* handling code are hard to get right. The utility functions in this file
* throw exceptions with appropriate error messages.
* Another problem is that the raw OS functions are not necessarily
* thread-safe. The _r variants of those functions (e.g. getpwnam_r) are
* thread-safe, but their API makes calling code riddled with boilerplate
* that is easy to get wrong.
*
* In short, the utility functions in this file are easier to use, are
* thread-safe, and are less error-prone compared to the raw OS functions.
*/
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <string>
#include <boost/core/noncopyable.hpp>
#include <StaticString.h>
#include <StrIntTools/StrIntUtils.h>
namespace Passenger {
using namespace std;
struct OsUserOrGroup: private boost::noncopyable {
DynamicBuffer buffer;
OsUserOrGroup();
virtual ~OsUserOrGroup();
};
struct OsUser: public OsUserOrGroup {
struct passwd pwd;
};
struct OsGroup: public OsUserOrGroup {
struct group grp;
};
/**
* Looks up an OS user account by name, similar to getpwnam(). Puts
* the result in `result`.
*
* @return True if lookup was successful, false if no user exists with the given name.
* @throws SystemException An error occurred while looking up the user, and it's not
* because the user does not exist.
*/
bool lookupSystemUserByName(const StaticString &name, OsUser &result);
/**
* Looks up an OS user account by UID, similar to getpwuid(). Puts
* the result in `result`.
*
* @return True if lookup was successful, false if no user exists with the given UID.
* @throws SystemException An error occurred while looking up the user, and it's not
* because the user does not exist.
*/
bool lookupSystemUserByUid(uid_t uid, OsUser &result);
/**
* Looks up an OS group account by name, similar to getgrnam(). Puts
* the result in `result`.
*
* @return True if lookup was successful, false if no group exists with the given name.
* @throws SystemException An error occurred while looking up the group, and it's not
* because the group does not exist.
*/
bool lookupSystemGroupByName(const StaticString &name, OsGroup &result);
/**
* Looks up an OS group account by GID, similar to getgrgid(). Puts
* the result in `result`.
*
* @return True if lookup was successful, false if no group exists with the given GID.
* @throws SystemException An error occurred while looking up the group, and it's not
* because the group does not exist.
*/
bool lookupSystemGroupByGid(gid_t gid, OsGroup &result);
/**
* Returns the username of the OS user account with the given UID. If no such
* account exists or if that account has no name, then returns a string that
* is printf-style formatted one of two ways, depending on `fallback`.
*
* if `fallback` is true the "%d" format string is used, otherwise "UID %d" is used.
*/
string lookupSystemUsernameByUid(uid_t uid, bool fallback=false);
/**
* Returns the group name of the OS group account with the given GID. If no such
* account exists or if that account has no name, then returns a string that
* is printf-style formatted one of two ways, depending on `fallback`.
*
* if `fallback` is true the "%d" format string is used, otherwise "GID %d" is used.
*/
string lookupSystemGroupnameByGid(gid_t gid, bool fallback=false);
/**
* Returns the home directory of the current user. This queries $HOME,
* or if that's not available, the OS user database.
*
* @throws SystemException
* @throws RuntimeException
*/
string getHomeDir();
} // namespace Passenger
#endif /* _PASSENGER_SYSTEM_TOOLS_USER_DATABASE_H_ */
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