Make resolv_is_address() function public and create some basic tests Resolves: https://fedorahosted.org/sssd/ticket/2789 Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

resolv: Use the same default timeout for SRV queries as previously When we changed the resolver code to use the TTL values from the DNS queries instead of harcoded ones, we changed the default value by accident. Add a separate SRV TTL that is backwards-compatible with the old harcoded value. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

RESOLV: Remove obsolete in-tree implementation of SRV and TXT parsing SSSD contained several backwards-compatible definitions of SRV and TXT APIs as well as structures that carry TTL data. These were intended for RHEL-5 and older releases. Since we don't support those upstream, it's better to remove the code -- it has drifted apart from upstream anyway. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

RESOLV: Add an internal function to read TTL from a DNS packet Related: https://fedorahosted.org/sssd/ticket/1884 Adds an internal resolver function that reads the TTL for SRV records as specified by RFC-2181. Several internal c-ares definitions are used until c-ares contains a function that exposes all this information via a parsing function. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

resolv_sort_srv_reply: remove unnecessary mem_ctx

Remove unused constant.

Actually use the index parameter in resolv_get_sockaddr_address_index

dyndns: New option dyndns_update_ptr https://fedorahosted.org/sssd/ticket/1832 While some servers, such as FreeIPA allow the PTR record to be synchronized when the forward record is updated, other servers, including Active Directory, require that the PTR record is synchronized manually. This patch adds a new option, dyndns_update_ptr that automatically generates appropriate DNS update message for updating the reverse zone. This option is off by default in the IPA provider. Also renames be_nsupdate_create_msg to be_nsupdate_create_fwd_msg

resolver: Return PTR record as string This is a requirement to update the PTR records. Includes a unit test.

resolv: add resolv_discover_srv request to resolv utils

resolv: add resolv_get_domain request to resolv utils

Centralize resolv_init, remove resolv context list

Init failover with be_res options

Allow returning arbitrary address from resolv_hostent as string

Split reading resolver family order into a separate function

Do not hardcode default resolver timeout

Add sockaddr_storage to sdap_service

Switch resolver to using resolv_hostent and honor TTL

Add new resolv_hostent data structure and utility functions

Add utility function to return IP address as string

Sort SRV replies according to RFC 2782 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.

Restrict family lookups Adds a new option that tells resolver which address family to prefer or use exclusively. Fixes: #404

Rename server/ directory to src/ Also update BUILD.txt