Tobias Brunner
292d8f41c3
getaddrinfo(3) may block a long time so proper termination of the daemon may block if DNS servers are not reachable. getaddrinfo(3) is an optional cancellation point in posix threads so it might still block a shutdown but at least on Android (with the signal based pthread_cancel implementation) it works, on Linux starter will kill charon anyway after a while.
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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* Copyright (C) 2012 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup host_resolver host_resolver
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* @{ @ingroup libstrongswan
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*/
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#ifndef HOST_RESOLVER_H_
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#define HOST_RESOLVER_H_
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#include "utils/host.h"
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typedef struct host_resolver_t host_resolver_t;
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/**
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* Resolve hosts by DNS name but do so in a separate thread (calling
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* getaddrinfo(3) directly might block indefinitely, or at least a very long
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* time if no DNS servers are reachable).
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*/
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struct host_resolver_t {
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/**
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* Resolve host from the given DNS name.
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*
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* @param name name to lookup
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* @param family requested address family
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* @return resolved host or NULL if failed or canceled
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*/
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host_t *(*resolve)(host_resolver_t *this, char *name, int family);
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/**
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* Flush the queue of queries. No new queries will be accepted afterwards.
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*/
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void (*flush)(host_resolver_t *this);
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/**
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* Destroy a host_resolver_t.
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*/
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void (*destroy)(host_resolver_t *this);
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};
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/**
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* Create a host_resolver_t instance.
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*
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* @param max_threads maximum number of resolver threads to use
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*/
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host_resolver_t *host_resolver_create(u_int max_threads);
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#endif /** HOST_RESOLVER_H_ @}*/
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