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DNS: Add basic support for asynchronous DNS resolving

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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>
This commit is contained in:
Yifeng Sun
2018-06-26 14:06:21 -07:00
committed by Ben Pfaff
parent def5b366a3
commit 771680d96f
25 changed files with 604 additions and 165 deletions
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4
python/ovs/stream.py
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@@ -702,8 +702,8 @@ def usage(name):
return """
Active %s connection methods:
unix:FILE Unix domain socket named FILE
tcp:IP:PORT TCP socket to IP with port no of PORT
ssl:IP:PORT SSL socket to IP with port no of PORT
tcp:HOST:PORT TCP socket to HOST with port no of PORT
ssl:HOST:PORT SSL socket to HOST with port no of PORT
Passive %s connection methods:
punix:FILE Listen on Unix domain socket FILE""" % (name, name)