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Abtin Keshavarzian
b212a0a748
This commit adds a generic SRP Advertising Proxy implementation to OpenThread core, which uses a set of newly defined `otPlatDnssd` platform APIs for DNS-SD (mDNS) support on infrastructure network on a Border Router. `Srp::Server` provides `ServiceUpdateHandler` callback mechanism that allows platforms to implement their own advertising proxy function. While this is still supported, the new generic advertising proxy implementation makes it easier to port and support the proxy function on new platforms. The platform needs to provide the DNS-SD platform APIs, which are designed to be simple and easy to implement. The `AdvertisingProxy` directly interacts with `Srp::Server` and its registered `Host` and `Service` entries, tracking whether an entry has been successfully advertised, is currently being advertised, or has been replaced by a new registration. The `AdvertisingProxy` ensures that consecutive SRP updates for the same host or service are committed on the server in the order they are received, even if their advertisements are finished in a different order. This is important for SRP Replication support, as the server may receive a large number of SRP updates back-to-back for the same host. The `AdvertisingProxy` will also register key records for SRP host and service instance names. This will keep the claim on the name of a removed entry while its key lease is not expired. It is also used when an SRP host registration has no off-mesh routable address. This commit adds a detailed unit test `test_srp_adv_proxy` that validates the `AdvertisingProxy` under many scenarios. The test covers a range of cases, including delayed registration callbacks and timeouts, new registrations replacing outstanding advertisements, platform DNS-SD state changes and failures, host address changes adding/removing OMR addresses.