6cc7eb4714
POSIX permits an indefinite required buffer size for querying GECOS fields. This is currently used in three locations. Previously, paludis would assume that it could perform a sysconf call to retrieve the requisite buffer size for ensuring that the subsequent GECOS field query would not receive a -ERANGE error. However, as it turns out, this is actually a problem even with GLIBC where the NSS may end up querying a service which has a larger field value for the `struct pwd` (glibc sets the return value to the NSS buffer length, aka 1k, but may end up querying a service which provides a larger response). Use local wrappers which perform the size adjustment to avoid an undersized buffer. Localise the functions which query the various GECOS fields which comprise the persona into util.
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2016 Saleem Abdulrasool
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_UTIL_PERSONA_H
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#define PALUDIS_GUARD_PALUDIS_UTIL_PERSONA_H
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#include <paludis/util/attributes.hh>
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#include <vector>
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#include <grp.h>
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#include <pwd.h>
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namespace paludis
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{
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int getpwnam_r_s(const char * name, std::vector<char> & buffer,
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struct passwd & pwd,
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struct passwd * & result) PALUDIS_VISIBLE;
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int getgrgid_r_s(gid_t gid, std::vector<char> & buffer, struct group & grp,
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struct group * & result) PALUDIS_VISIBLE;
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int getpwuid_r_s(uid_t uid, std::vector<char> & buffer, struct passwd & pwd,
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struct passwd * & result) PALUDIS_VISIBLE;
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}
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#endif
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