85a5fe290b
internally. Do that, and make sure that conversations between signed and unsigned don't overflow
90 lines
2.5 KiB
C
90 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 Scott Long <scottl@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/types.h>
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#include <sys/errno.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 <string.h>
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#include <unistd.h>
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ssize_t
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getlocalbase(char *path, size_t pathlen)
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{
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ssize_t tmplen;
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const char *tmppath;
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if ((pathlen == 0) || (path == NULL)) {
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errno = EINVAL;
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return (-1);
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}
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/* It's unlikely that the buffer would be this big */
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if (pathlen > SSIZE_MAX) {
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errno = ENOMEM;
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return (-1);
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}
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tmppath = NULL;
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tmplen = (size_t)pathlen;
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if (issetugid() == 0)
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tmppath = getenv("LOCALBASE");
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if ((tmppath == NULL) &&
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(sysctlbyname("user.localbase", path, (size_t *)&tmplen, NULL,
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0) == 0)) {
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return (tmplen);
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}
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if (tmppath == NULL)
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#ifdef _PATH_LOCALBASE
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tmppath = _PATH_LOCALBASE;
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#else
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tmppath = "/usr/local";
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#endif
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tmplen = strlcpy(path, tmppath, pathlen);
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if ((tmplen < 0) || (tmplen >= (ssize_t)pathlen)) {
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errno = ENOMEM;
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return (-1);
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}
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/* It's unlikely that the buffer would be this big */
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if (tmplen > SSIZE_MAX) {
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errno = ENOMEM;
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return (-1);
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}
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return ((ssize_t)tmplen);
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}
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