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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2026 Dag-Erling Smørgrav
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <libutil.h>
#include <paths.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef _PATH_LOCALBASE
#define _PATH_LOCALBASE "/usr/local"
#endif
/*
* Used in case of error; guaranteed to not be the start of a valid path
* name. Deliberately includes a trailing path separator so that any
* access will fail with ENOTDIR.
*/
#define INVALID_PREFIX "/dev/null/"
/*
* Copies a path from src to dst, which may point to the same buffer,
* while deduplicating path separators. Returns false if the path is not
* absolute or the result (including the terminating NUL) exceeds len
* characters.
*/
static bool
normalize(const char *src, char *dst, size_t len)
{
if (*src != '/' || len == 0)
return (false);
while (*src == '/')
src++;
do {
*dst++ = '/';
if (--len == 0)
return (false);
while (*src != '\0' && *src != '/') {
*dst++ = *src++;
if (--len == 0)
return (false);
}
while (*src == '/')
src++;
} while (*src != '\0');
*dst = '\0';
return (true);
}
const char *
getlocalbase(void)
{
static const int oid[2] = { CTL_USER, USER_LOCALBASE };
static char buf[MAXPATHLEN];
static const char *localbase = NULL;
char *path;
size_t len = sizeof(buf);
if (localbase != NULL)
return (localbase);
/* If not privileged, try the environment first */
if ((path = secure_getenv("LOCALBASE")) != NULL && *path != '\0') {
if (!normalize(path, buf, sizeof(buf)))
return (localbase = INVALID_PREFIX);
return (localbase = buf);
}
/* Next, try the sysctl variable */
if (sysctl(oid, 2, buf, &len, NULL, 0) != 0) {
if (errno == ENOMEM)
return (localbase = INVALID_PREFIX);
} else if (*buf != '\0') {
if (!normalize(buf, buf, sizeof(buf)))
return (localbase = INVALID_PREFIX);
return (localbase = buf);
}
/* Fall back to the hardcoded default */
return (localbase = _PATH_LOCALBASE);
}
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