30d21d2795
This function returns the path to the local software base directory, by default "/usr/local" (or the value of _PATH_LOCALBASE in include/paths.h when building the world). The value returned can be overridden by 2 methods: - the LOCALBASE environment variable (ignored by SUID programs) - else a non-default user.localbase sysctl value Reviewed by: hps (earlier version) Relnotes: yes Differential Revision: https://reviews.freebsd.org/D27236
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright 2020 Stefan Eßer <se@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/limits.h>
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#include <stdlib.h>
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#include <paths.h>
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#include <libutil.h>
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#include <unistd.h>
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#ifndef _PATH_LOCALBASE
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#define _PATH_LOCALBASE "/usr/local"
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#endif
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const char *
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getlocalbase(void)
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{
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static const int localbase_oid[2] = {CTL_USER, USER_LOCALBASE};
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char *tmppath;
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size_t tmplen;
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static const char *localbase = NULL;
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if (issetugid() == 0) {
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tmppath = getenv("LOCALBASE");
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if (tmppath != NULL && tmppath[0] != '\0')
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return (tmppath);
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}
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if (sysctl(localbase_oid, 2, NULL, &tmplen, NULL, 0) == 0 &&
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(tmppath = malloc(tmplen)) != NULL &&
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sysctl(localbase_oid, 2, tmppath, &tmplen, NULL, 0) == 0) {
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/*
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* Check for some other thread already having
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* set localbase - this should use atomic ops.
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* The amount of memory allocated above may leak,
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* if a parallel update in another thread is not
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* detected and the non-NULL pointer is overwritten.
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*/
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if (tmppath[0] != '\0' &&
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(volatile const char*)localbase == NULL)
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localbase = tmppath;
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else
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free((void*)tmppath);
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return (localbase);
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}
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return (_PATH_LOCALBASE);
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}
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