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771680d96f
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>
27 lines
825 B
C
27 lines
825 B
C
/*
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* Copyright (c) 2017, 2018 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef DNS_RESOLVE_H
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#define DNS_RESOLVE_H 1
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#include <stdbool.h>
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void dns_resolve_init(bool is_daemon);
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bool dns_resolve(const char *name, char **addr);
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void dns_resolve_destroy(void);
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#endif /* dns-resolve.h */
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