Index: head/lib/libutil/Makefile =================================================================== --- head/lib/libutil/Makefile +++ head/lib/libutil/Makefile @@ -12,7 +12,8 @@ LIB= util SHLIB_MAJOR= 9 -SRCS= _secure_path.c auth.c expand_number.c flopen.c fparseln.c gr_util.c \ +SRCS= _secure_path.c auth.c expand_number.c flopen.c fparseln.c \ + getlocalbase.c gr_util.c \ hexdump.c humanize_number.c kinfo_getfile.c \ kinfo_getallproc.c kinfo_getproc.c kinfo_getvmmap.c \ kinfo_getvmobject.c kld.c \ @@ -30,7 +31,7 @@ CFLAGS+= -I${.CURDIR} -I${SRCTOP}/lib/libc/gen/ -MAN+= expand_number.3 flopen.3 fparseln.3 hexdump.3 \ +MAN+= expand_number.3 flopen.3 fparseln.3 getlocalbase.3 hexdump.3 \ humanize_number.3 kinfo_getallproc.3 kinfo_getfile.3 \ kinfo_getproc.3 kinfo_getvmmap.3 kinfo_getvmobject.3 kld.3 \ login_auth.3 login_cap.3 \ Index: head/lib/libutil/getlocalbase.3 =================================================================== --- head/lib/libutil/getlocalbase.3 +++ head/lib/libutil/getlocalbase.3 @@ -0,0 +1,110 @@ +.\" +.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD +.\" +.\" Copyright 2020 Scott Long +.\" +.\" 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 AUTHOR 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 AUTHOR 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. +.\" +.\" $FreeBSD$ +.\" +.Dd Oct 28, 2020 +.Dt GETLOCALBASE 3 +.Os +.Sh NAME +.Nm getlocalbase +.Nd "return the path to the local software directory" +.Sh LIBRARY +.Lb libutil +.Sh SYNOPSIS +.In libutil.h +.Ft ssize_t +.Fn getlocalbase "char *path" "size_t len" +.Sh DESCRIPTION +The +.Fn getlocalbase +function returns the path to the local software base directory. +Normally this is the +.Pa /usr/local +directory. +First the +.Ev LOCALBASE +environment variable is checked. +If that doesn't exist then the +.Va user.localbase +sysctl is checked. +If that also doesn't exist then the value of the +.Dv _PATH_LOCALBASE +compile-time variable is used. +If that is undefined then the default of +.Pa /usr/local +is used. +.Pp +The +.Fa path +argument points to a caller-supplied buffer to hold the resulting pathname. +The +.Fa len +argument is the length of the caller-supplied buffer. +.Sh IMPLEMENTATION NOTES +Calls to +.Fn getlocalpath +will perform a setugid check on the running binary before checking the +environment. +.Sh RETURN VALUES +If the request completes without error, the size of the string copied into the +buffer, including the terminating NUL, is returned. +If an error occurred or the buffer was too small to hold the string, +.Fn getlocalbase +returns -1 and sets +.Em errno +to indicate the error condition. +.Sh ENVIRONMENT +The +.Fn getlocalbase +library function retrieves the +.Ev LOCALBASE +environment variable. +.Sh ERRORS +The +.Fn getlocalbase +function will fail and set +.Va errno +for the following conditions: +.Bl -tag -width Er +.It Bq Er EINVAL +One of the passed in parameters is NULL or zero. +.It Bq Er ENOMEM +There isn't enough space in the passed in buffer to hold the pathname string. +.El +.Sh SEE ALSO +.Xr env 1 , +.Xr src.conf 5 , +.Xr sysctl 8 +.Sh HISTORY +The +.Nm +library function first appeared in +.Fx 13.0 . +.Sh AUTHORS +This +manual page was written by +.An Scott Long Aq Mt scottl@FreeBSD.org . Index: head/lib/libutil/getlocalbase.c =================================================================== --- head/lib/libutil/getlocalbase.c +++ head/lib/libutil/getlocalbase.c @@ -0,0 +1,75 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2020 Scott Long + * + * 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 +__FBSDID("$FreeBSD$"); + +#include +#include +#include +#include +#include +#include +#include +#include + +ssize_t +getlocalbase(char *path, size_t pathlen) +{ + size_t tmplen; + const char *tmppath; + + if ((pathlen == 0) || (path == NULL)) { + errno = EINVAL; + return (-1); + } + + tmppath = NULL; + tmplen = pathlen; + if (issetugid() == 0) + tmppath = getenv("LOCALBASE"); + + if ((tmppath == NULL) && + (sysctlbyname("user.localbase", path, &tmplen, NULL, 0) == 0)) { + return (tmplen); + } + + if (tmppath == NULL) +#ifdef _PATH_LOCALBASE + tmppath = _PATH_LOCALBASE; +#else + tmppath = "/usr/local"; +#endif + + tmplen = strlcpy(path, tmppath, pathlen); + if ((tmplen < 0) || (tmplen >= (ssize_t)pathlen)) { + errno = ENOMEM; + tmplen = -1; + } + + return (tmplen); +} Index: head/lib/libutil/libutil.h =================================================================== --- head/lib/libutil/libutil.h +++ head/lib/libutil/libutil.h @@ -98,6 +98,7 @@ int flopenat(int _dirfd, const char *_path, int _flags, ...); int forkpty(int *_amaster, char *_name, struct termios *_termp, struct winsize *_winp); +ssize_t getlocalbase(char *path, size_t pathlen); void hexdump(const void *_ptr, int _length, const char *_hdr, int _flags); int humanize_number(char *_buf, size_t _len, int64_t _number, const char *_suffix, int _scale, int _flags);