dnl MC_MCSERVER_CHECKS
dnl    Check how mcserver should check passwords.
dnl    Possible methods are PAM, pwdauth and crypt.
dnl    The later works with both /etc/shadow and /etc/passwd.
dnl    If PAM is found, other methods are not checked.

AC_DEFUN([MC_MCSERVER_CHECKS], [

    dnl Check if PAM can be used for mcserv
    AC_CHECK_LIB(dl, dlopen, [LIB_DL="-ldl"])
    AC_CHECK_LIB(pam, pam_start, [
	AC_DEFINE(HAVE_PAM, 1,
		  [Define if PAM (Pluggable Authentication Modules) is available])
	MCSERVLIBS="-lpam $LIB_DL"
	mcserv_pam=yes], [], [$LIB_DL])

    dnl Check for crypt() - needed for both /etc/shadow and /etc/passwd.
    if test -z "$mcserv_pam"; then

	dnl Check for pwdauth() - used on SunOS.
	AC_CHECK_FUNCS([pwdauth])

	dnl Check for crypt()
	AC_CHECK_HEADERS([crypt.h], [crypt_header=yes])
	if test -n "$crypt_header"; then
	    save_LIBS="$LIBS"
	    LIBS=
	    AC_SEARCH_LIBS(crypt, [crypt crypt_i], [mcserv_auth=crypt])
	    MCSERVLIBS="$LIBS"
	    LIBS="$save_LIBS"
	    if test -n "$mcserv_auth"; then
		AC_DEFINE(HAVE_CRYPT, 1,
			  [Define to use crypt function in mcserv])

		dnl Check for shadow passwords
		AC_CHECK_HEADERS([shadow.h shadow/shadow.h],
				 [shadow_header=yes; break])
		if test -n "$shadow_header"; then
		    save_LIBS="$LIBS"
		    LIBS="$MCSERVLIBS"
		    AC_SEARCH_LIBS(getspnam, [shadow], [mcserv_auth=shadow])
		    MCSERVLIBS="$LIBS"
		    LIBS="$save_LIBS"
		    if test -n "$mcserv_auth"; then
			AC_DEFINE(HAVE_SHADOW, 1,
				  [Define to use shadow passwords for mcserv])
		    fi
		fi
	    fi
	fi
    fi

    AC_SUBST(MCSERVLIBS)
])