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107 lines
3.3 KiB
107 lines
3.3 KiB
/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/my_getpwnam.cc
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*/
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#include "my_getpwnam.h"
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#include <atomic>
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#include <vector>
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#include <errno.h>
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#include <unistd.h>
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namespace {
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std::size_t start_bufsz() {
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long scsz = sysconf(_SC_GETPW_R_SIZE_MAX);
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return (scsz == -1L ? 256 : scsz);
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}
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template <class GETPW_CLOS>
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PasswdValue my_getpw_(GETPW_CLOS &&getpwfunc) {
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passwd pwd;
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std::size_t bufsz = start_bufsz();
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std::vector<char> buf(bufsz);
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passwd *resptr = nullptr;
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while (true) {
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errno = getpwfunc(&pwd, &buf, &resptr);
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switch (errno) {
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case ERANGE:
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bufsz *= 2;
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buf.resize(bufsz);
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// fallthrough
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case EINTR:
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continue;
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default:
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break;
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}
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break;
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}
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return resptr ? PasswdValue{pwd} : PasswdValue{};
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}
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} // namespace
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/**
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Wrapper around the getpwnam_r() POSIX function which places the
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contents of the passwd struct into an object with value semantics
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and returns this.
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@param name Symbolic user id
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@retval PasswdValue representing user's passwd entry.
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PasswdValue::IsVoid() returns true if no such user exists or an error
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occured. In the latter case errno is set.
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*/
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PasswdValue my_getpwnam(const char *name) {
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return my_getpw_(
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[&name](passwd *pwd, std::vector<char> *bufp, passwd **resptr) {
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return getpwnam_r(name, pwd, &bufp->front(), bufp->size(), resptr);
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});
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}
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/**
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Wrapper around the getpwuid_r() POSIX function which places the
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contents of the passwd struct into an object with value semantics
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and returns this.
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@param uid Numeric user id
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@retval PasswdValue representing user's passwd entry.
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PasswdValue::IsVoid() returns true if no such user exists or an error
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occured. In the latter case errno is set.
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*/
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PasswdValue my_getpwuid(uid_t uid) {
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return my_getpw_(
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[uid](passwd *pwd, std::vector<char> *bufp, passwd **resptr) {
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return getpwuid_r(uid, pwd, &bufp->front(), bufp->size(), resptr);
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});
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}
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