# dnscrypt.m4

# dnsc_DNSCRYPT([action-if-true], [action-if-false])
# --------------------------------------------------------------------------
# Check for required dnscrypt libraries and add dnscrypt configure args.
AC_DEFUN([dnsc_DNSCRYPT],
[
 AC_ARG_ENABLE([dnscrypt],
   AS_HELP_STRING([--enable-dnscrypt],
                  [Enable dnscrypt support (requires libsodium)]),
   [opt_dnscrypt=$enableval], [opt_dnscrypt=no])

 if test "x$opt_dnscrypt" != "xno"; then
   AC_ARG_WITH([libsodium], AS_HELP_STRING([--with-libsodium=path],
       [Path where libsodium is installed, for dnscrypt]), [
       CFLAGS="$CFLAGS -I$withval/include"
       LDFLAGS="$LDFLAGS -L$withval/lib"
   ])
   AC_SEARCH_LIBS([sodium_init], [sodium], [],
     AC_MSG_ERROR([The sodium library was not found. Please install sodium!]))
   AC_SEARCH_LIBS([crypto_box_curve25519xchacha20poly1305_beforenm], [sodium],
       [
           AC_SUBST([ENABLE_DNSCRYPT_XCHACHA20], [1])
           AC_DEFINE(
               [USE_DNSCRYPT_XCHACHA20], [1],
               [Define to 1 to enable dnscrypt with xchacha20 support])
       ],
       [
           AC_SUBST([ENABLE_DNSCRYPT_XCHACHA20], [0])
       ])
   AC_SEARCH_LIBS([sodium_set_misuse_handler], [sodium],
       [
           AC_DEFINE(
               [SODIUM_MISUSE_HANDLER], [1],
               [Define to 1 if libsodium supports sodium_set_misuse_handler])
       ],
       [
       ])
   $1
 else
   AC_SUBST([ENABLE_DNSCRYPT_XCHACHA20], [0])
   $2
 fi
])

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