diff options
| author | Yifeng Sun <pkusunyifeng@gmail.com> | 2018-06-26 14:06:21 -0700 |
|---|---|---|
| committer | Ben Pfaff <blp@ovn.org> | 2018-07-06 13:50:00 -0700 |
| commit | 771680d96fb6f996987630cb85bb749478512268 (patch) | |
| tree | e3fddb4c770f88e405fd82787933216fc5b1ac58 /m4 | |
| parent | def5b366a3626fddc87a449e8447f79a6957d55f (diff) | |
| download | openvswitch-771680d96fb6f996987630cb85bb749478512268.tar.gz | |
DNS: Add basic support for asynchronous DNS resolving
This patch is a simple implementation for the proposal discussed in
https://mail.openvswitch.org/pipermail/ovs-dev/2017-August/337038.html and
https://mail.openvswitch.org/pipermail/ovs-dev/2017-October/340013.html.
It enables ovs-vswitchd and other utilities to use DNS names when specifying
OpenFlow and OVSDB remotes.
Below are some of the features and limitations of this patch:
- Resolving is asynchornous in daemon context, avoiding blocking main loop;
- Resolving is synchronous in general utility context;
- Both IPv4 and IPv6 are supported;
- The resolving API is thread-safe;
- Depends on the unbound library;
- When multiple ip addresses are returned, only the first one is used;
- /etc/nsswitch.conf isn't respected as unbound library doesn't look at it;
- For async-resolving, caller need to retry later; there is no callback.
Signed-off-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/openvswitch.m4 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4 index 3f301b23b..8c62de763 100644 --- a/m4/openvswitch.m4 +++ b/m4/openvswitch.m4 @@ -669,3 +669,13 @@ AC_DEFUN([OVS_CHECK_CXX], enable_cxx=false fi AM_CONDITIONAL([HAVE_CXX], [$enable_cxx])]) + +dnl Checks for unbound library. +AC_DEFUN([OVS_CHECK_UNBOUND], + [AC_CHECK_LIB(unbound, ub_ctx_create, [HAVE_UNBOUND=yes]) + if test "$HAVE_UNBOUND" = yes; then + AC_DEFINE([HAVE_UNBOUND], [1], [Define to 1 if unbound is detected.]) + LIBS="$LIBS -lunbound" + fi + AM_CONDITIONAL([HAVE_UNBOUND], [test "$HAVE_UNBOUND" = yes]) + AC_SUBST([HAVE_UNBOUND])]) |