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Allows to be more concise in tests and more defensive in resolve
callbacks
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For backwards-compatibility with older versions of the SSSD (such
as 1.2.x), we need to be able to have our DNS SRV record lookup be
capable of falling back to using the SSSD domain name as the DNS
discovery domain.
This patch modifies our DNS lookups so that they behave as
follows:
If dns_discovery_domain is specified, it is considered
authoritative. No other discovery domains will be attempted.
If dns_discovery_domain is not specified, we first attempt to look
up the SRV records using the domain portion of the machine's
hostname. If this returns "NOTFOUND", we will try performing an
SRV record query using the SSSD domain name as the DNS discovery
domain.
https://fedorahosted.org/sssd/ticket/754
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Before setting the backend to online during a reset offline request the
check_online method if the ID provider is called. If the check_online
method returns that the ID provider is still not reachable the backend
stays offline. Otherwise the backend is switched to online and the
related callbacks are run.
Additionally the check online test is called during the res_init request
because a change in /etc/resolve.conf might also make a server reachable
which was assumed offline before.
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server was unexpectedly dropped.
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through SRV records) failover servers.
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Integrate the failover improvements with our back ends. The DNS domain
used in the SRV query is always the SSSD domain name.
Please note that this patch changes the default value of ldap_uri from
"ldap://localhost" to "NULL" in order to use service discovery with no
server set.
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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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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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