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# -*- Autoconf -*-
# SYNOPSIS
#
# AX_CHECK_CAPSICUM([action-if-found[, action-if-not-found]])
#
# DESCRIPTION
#
# This macro searches for an installed Capsicum library, and if found:
# - calls one of AC_DEFINE([HAVE_CAPSICUM_SYS_CAPSICUM_H]) or
# AC_DEFINE([HAVE_CAPSICUM_SYS_CAPABILITY_H])
# - sets CAPSICUM_LIB to the -l option needed to link Capsicum support.
#
# If either the header file or the library is not found,
# shell commands 'action-if-not-found' is run.
#
# If both header file and library are found, shell commands
# 'action-if-found' is run. If 'action-if-found' is not specified, the
# default action:
# - calls AC_DEFINE(HAVE_CAPSICUM)
# - prepends ${CAPSICUM_LIB} to LIBS.
#
# You should use autoheader to include a definition for the symbols above
# in a config.h file.
#
# Sample usage in a C/C++ source is as follows:
#
# #ifdef HAVE_CAPSICUM
# # ifdef HAVE_CAPSICUM_SYS_CAPSICUM_H
# # include <sys/capsicum.h>
# # else
# # ifdef HAVE_CAPSICUM_SYS_CAPABILITY_H
# # include <sys/capability.h>
# # endif
# # endif
# #endif /* HAVE_CAPSICUM */
#
# LICENSE
#
# Copyright (c) 2014 Google Inc.
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
AU_ALIAS([CHECK_CAPSICUM], [AX_CHECK_CAPSICUM])
AC_DEFUN([AX_CHECK_CAPSICUM],
[AC_CHECK_HEADERS([sys/capability.h sys/capsicum.h])
capsicum_hdrfound=false
# If <sys/capsicum.h> exists (Linux, FreeBSD>=11.x), assume it is the correct header.
if test "x$ac_cv_header_sys_capsicum_h" = "xyes" ; then
AC_DEFINE([HAVE_CAPSICUM_SYS_CAPSICUM_H],[],[Capsicum functions declared in <sys/capsicum.h>])
capsicum_hdrfound=true
elif test "x$ac_cv_header_sys_capability_h" = "xyes" ; then
# Just <sys/capability.h>; on FreeBSD 10.x this covers Capsicum, but on Linux it
# describes POSIX.1e capabilities. So check it declares cap_rights_limit.
AC_CHECK_DECL([cap_rights_limit],
[AC_DEFINE([HAVE_CAPSICUM_SYS_CAPABILITY_H],[],[Capsicum functions declared in <sys/capability.h>])
capsicum_hdrfound=true],[],
[#include <sys/capability.h>])
fi
AC_LANG_PUSH([C])
# FreeBSD >= 10.x has Capsicum functions in libc
capsicum_libfound=false
AC_LINK_IFELSE([AC_LANG_CALL([], [cap_rights_limit])],
[capsicum_libfound=true],[])
# Linux has Capsicum functions in libcaprights
AC_CHECK_LIB([caprights],[cap_rights_limit],
[AC_SUBST([CAPSICUM_LIB],[-lcaprights])
capsicum_libfound=true],[])
AC_LANG_POP([C])
if test "$capsicum_hdrfound" = "true" && test "$capsicum_libfound" = "true"
then
# If both library and header were found, action-if-found
m4_ifblank([$1],[
LIBS="${CAPSICUM_LIB} $LIBS"
AC_DEFINE([HAVE_CAPSICUM],[],[Capsicum library available])])
else
# If either header or library was not found, action-if-not-found
m4_default([$2],[AC_MSG_WARN([Capsicum support not found])])
fi])
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