dnl Check for LDAP
dnl Copyright (C) 2005 Free Software Foundation, Inc.
dnl
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License.  As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
dnl
dnl Defines HAVE_LIBUSB to 1 if a working libusb setup is found, and sets
dnl @LIBUSB@ to the necessary libraries.  HAVE_USB_GET_BUSSES is set if
dnl usb_get_busses() exists.

AC_DEFUN([GNUPG_CHECK_LDAP],
[
# Try and link a LDAP test program to weed out unusable LDAP
# libraries.  -lldap [-llber [-lresolv]] is for older OpenLDAPs.
# OpenLDAP, circa 1999, was terrible with creating weird dependencies.
# This seems to have all been resolved, so I'm simplifying this code
# significantly.  If all else fails, the user can play
# guess-the-dependency by using something like ./configure
# LDAPLIBS="-Lfoo -lbar"

  AC_ARG_WITH(ldap,
     AC_HELP_STRING([--with-ldap=DIR],[look for the LDAP library in DIR]),
     [
     if test -d "$withval" ; then
        CPPFLAGS="${CPPFLAGS} -I$withval/include"
        LDFLAGS="${LDFLAGS} -L$withval/lib"
     fi
     ])

  for MY_LDAPLIBS in ${LDAPLIBS+"$LDAPLIBS"} "-lldap" "-lldap -llber" "-lldap -llber -lresolv" "-lwldap32"; do
    _ldap_save_libs=$LIBS
    LIBS="$MY_LDAPLIBS $1 $LIBS"

    AC_MSG_CHECKING([whether LDAP via \"$MY_LDAPLIBS\" is present and sane])
    AC_TRY_LINK([
#ifdef _WIN32
#include <winsock2.h>
#include <winldap.h>
#else
#include <ldap.h>
#endif
],[ldap_open("foobar",1234);],
                [gnupg_cv_func_ldap_init=yes],[gnupg_cv_func_ldap_init=no])
    AC_MSG_RESULT([$gnupg_cv_func_ldap_init])

    if test $gnupg_cv_func_ldap_init = no; then
      AC_MSG_CHECKING([whether I can make LDAP be sane with lber.h])
      AC_TRY_LINK([#include <lber.h>
#include <ldap.h>],[ldap_open("foobar",1234);],
         [gnupg_cv_func_ldaplber_init=yes],[gnupg_cv_func_ldaplber_init=no])
      AC_MSG_RESULT([$gnupg_cv_func_ldaplber_init])
    fi

    if test "$gnupg_cv_func_ldaplber_init" = yes ; then
       AC_DEFINE(NEED_LBER_H,1,[Define if the LDAP library requires including lber.h before ldap.h])
    fi

    if test "$gnupg_cv_func_ldap_init" = yes || \
        test "$gnupg_cv_func_ldaplber_init" = yes ; then
       LDAPLIBS=$MY_LDAPLIBS
       GPGKEYS_LDAP="gpgkeys_ldap$EXEEXT"

       AC_CHECK_FUNCS(ldap_get_option ldap_set_option ldap_start_tls_s)

       if test "$ac_cv_func_ldap_get_option" != yes ; then
          AC_MSG_CHECKING([whether LDAP supports ld_errno])
	  AC_TRY_LINK([#include <ldap.h>],[LDAP *ldap; ldap->ld_errno;],
	     [gnupg_cv_func_ldap_ld_errno=yes],
	     [gnupg_cv_func_ldap_ld_errno=no])
          AC_MSG_RESULT([$gnupg_cv_func_ldap_ld_errno])

	  if test "$gnupg_cv_func_ldap_ld_errno" = yes ; then
	     AC_DEFINE(HAVE_LDAP_LD_ERRNO,1,[Define if the LDAP library supports ld_errno])
          fi
       fi
    fi

    LIBS=$_ldap_save_libs

    if test "$GPGKEYS_LDAP" != "" ; then break; fi
  done

  AC_SUBST(GPGKEYS_LDAP)
  AC_SUBST(LDAPLIBS)
])dnl