dns: Add core DNS API + unit tests and res_resolver_unbound module + unit tests.

This change adds an abstracted core DNS API which resembles the API described
here[1]. The API provides a pluggable mechanism for resolvers and also a
consistent view for records. Both synchronous and asynchronous queries are
supported.

This change also adds a res_resolver_unbound module which uses the libunbound
library to provide resolution.

Unit tests have also been written for all of the above to confirm the API and
functionality.

ASTERISK-24834 #close
Reported by: Matt Jordan

ASTERISK-24836 #close
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/4474/
Review: https://reviewboard.asterisk.org/r/4512/

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+DNS+API


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433370 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 144 insertions, 1 deletions

diff --git a/configure b/configure
index be5062007..9a2630dc1 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 432282 .
+# From configure.ac Revision: 432815 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.69 for asterisk trunk.
 #
@@ -731,6 +731,10 @@ PBX_UNIXODBC
 UNIXODBC_DIR
 UNIXODBC_INCLUDE
 UNIXODBC_LIB
+PBX_UNBOUND
+UNBOUND_DIR
+UNBOUND_INCLUDE
+UNBOUND_LIB
 PBX_TONEZONE
 TONEZONE_DIR
 TONEZONE_INCLUDE
@@ -1357,6 +1361,7 @@ with_termcap
 with_timerfd
 with_tinfo
 with_tonezone
+with_unbound
 with_unixodbc
 with_vorbis
 with_vpb
@@ -2097,6 +2102,7 @@ Optional Packages:
   --with-timerfd=PATH     use timerfd files in PATH
   --with-tinfo=PATH       use Term Info files in PATH
   --with-tonezone=PATH    use tonezone files in PATH
+  --with-unbound=PATH     use unbound files in PATH
   --with-unixodbc=PATH    use unixODBC files in PATH
   --with-vorbis=PATH      use Vorbis files in PATH
   --with-vpb=PATH         use Voicetronix API files in PATH
@@ -11299,6 +11305,38 @@ fi
 
 
 
+    UNBOUND_DESCRIP="unbound"
+    UNBOUND_OPTION="unbound"
+    PBX_UNBOUND=0
+
+# Check whether --with-unbound was given.
+if test "${with_unbound+set}" = set; then :
+  withval=$with_unbound;
+	case ${withval} in
+	n|no)
+	USE_UNBOUND=no
+	# -1 is a magic value used by menuselect to know that the package
+	# was disabled, other than 'not found'
+	PBX_UNBOUND=-1
+	;;
+	y|ye|yes)
+	ac_mandatory_list="${ac_mandatory_list} UNBOUND"
+	;;
+	*)
+	UNBOUND_DIR="${withval}"
+	ac_mandatory_list="${ac_mandatory_list} UNBOUND"
+	;;
+	esac
+
+fi
+
+
+
+
+
+
+
+
     UNIXODBC_DESCRIP="unixODBC"
     UNIXODBC_OPTION="unixodbc"
     PBX_UNIXODBC=0
@@ -22704,6 +22742,111 @@ fi
 
 
 
+if test "x${PBX_UNBOUND}" != "x1" -a "${USE_UNBOUND}" != "no"; then
+   pbxlibdir=""
+   # if --with-UNBOUND=DIR has been specified, use it.
+   if test "x${UNBOUND_DIR}" != "x"; then
+      if test -d ${UNBOUND_DIR}/lib; then
+         pbxlibdir="-L${UNBOUND_DIR}/lib"
+      else
+         pbxlibdir="-L${UNBOUND_DIR}"
+      fi
+   fi
+   pbxfuncname="ub_ctx_create"
+   if test "x${pbxfuncname}" = "x" ; then   # empty lib, assume only headers
+      AST_UNBOUND_FOUND=yes
+   else
+      ast_ext_lib_check_save_CFLAGS="${CFLAGS}"
+      CFLAGS="${CFLAGS} "
+      as_ac_Lib=`$as_echo "ac_cv_lib_unbound_${pbxfuncname}" | $as_tr_sh`
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ${pbxfuncname} in -lunbound" >&5
+$as_echo_n "checking for ${pbxfuncname} in -lunbound... " >&6; }
+if eval \${$as_ac_Lib+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lunbound ${pbxlibdir}  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char ${pbxfuncname} ();
+int
+main ()
+{
+return ${pbxfuncname} ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  eval "$as_ac_Lib=yes"
+else
+  eval "$as_ac_Lib=no"
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+eval ac_res=\$$as_ac_Lib
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+if eval test \"x\$"$as_ac_Lib"\" = x"yes"; then :
+  AST_UNBOUND_FOUND=yes
+else
+  AST_UNBOUND_FOUND=no
+fi
+
+      CFLAGS="${ast_ext_lib_check_save_CFLAGS}"
+   fi
+
+   # now check for the header.
+   if test "${AST_UNBOUND_FOUND}" = "yes"; then
+      UNBOUND_LIB="${pbxlibdir} -lunbound "
+      # if --with-UNBOUND=DIR has been specified, use it.
+      if test "x${UNBOUND_DIR}" != "x"; then
+         UNBOUND_INCLUDE="-I${UNBOUND_DIR}/include"
+      fi
+      UNBOUND_INCLUDE="${UNBOUND_INCLUDE} "
+      if test "xunbound.h" = "x" ; then	# no header, assume found
+         UNBOUND_HEADER_FOUND="1"
+      else				# check for the header
+         ast_ext_lib_check_saved_CPPFLAGS="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${UNBOUND_INCLUDE}"
+         ac_fn_c_check_header_mongrel "$LINENO" "unbound.h" "ac_cv_header_unbound_h" "$ac_includes_default"
+if test "x$ac_cv_header_unbound_h" = xyes; then :
+  UNBOUND_HEADER_FOUND=1
+else
+  UNBOUND_HEADER_FOUND=0
+fi
+
+
+         CPPFLAGS="${ast_ext_lib_check_saved_CPPFLAGS}"
+      fi
+      if test "x${UNBOUND_HEADER_FOUND}" = "x0" ; then
+         UNBOUND_LIB=""
+         UNBOUND_INCLUDE=""
+      else
+         if test "x${pbxfuncname}" = "x" ; then		# only checking headers -> no library
+            UNBOUND_LIB=""
+         fi
+         PBX_UNBOUND=1
+         cat >>confdefs.h <<_ACEOF
+#define HAVE_UNBOUND 1
+_ACEOF
+
+      fi
+   fi
+fi
+
+
+
+
 if test "x${PBX_UNIXODBC}" != "x1" -a "${USE_UNIXODBC}" != "no"; then
    pbxlibdir=""
    # if --with-UNIXODBC=DIR has been specified, use it.