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We had a hard-coded timeout of five seconds for DNS lookups in the
async resolver. This patch adds an option 'dns_resolver_timeout'
to specify this value (Default: 5)
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Adds a new failover API call fo_add_srv_server that allows the caller
to specify a server that is later resolved into a list of specific
servers using SRV requests.
Also adds a new failover option that specifies how often should the
servers resolved from SRV query considered valid until we need a
refresh.
The "real" servers to connect to are returned to the user as usual,
using the fo_resolve_service_{send,recv} calls.
Make SRV resolution work with c-ares 1.6
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RFC 2782 defines a way to sort replies to a SRV query. In short, the
algorithm sorts all replies by priority and then does a weight-based
selection for every priority level.
For details, please see the sections "Usage rules" for overview of the
algorithm and section "The 'Weight' field" for description on the weight
selection.
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This patch removes some tab-indentations from pamsrv.c, too.
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Adds a new option that tells resolver which address family to prefer or
use exclusively.
Fixes: #404
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Also update BUILD.txt
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