Adds a per-instance uint64 hash to DefaultServer to detect identical merged host DNS configs (including extra domains). applyHostConfig computes and compares the hash, skips applying if unchanged, treats hash errors as a fail-safe (proceed to apply), and updates the stored hash only after successful hashing and apply.
* fix: macos privacy warning
Move GetDesktopUIUserAgent to its own package so UI does not have to
import client/system package that reaches out to broadcasts address.
Thus, fixing the network privacy warnings.
Moving code to ensure wgInterface is gone right after context is
cancelled/stop in the off chance that on next retry the backoff
operation is permanently cancelled and interface is abandoned without
destroying.
On macOS use the recommended settings for providing split DNS. As per
the docs an empty string will force the configuration to be the default.
In order to to support split DNS an additional service config is added
for the local server and search domain settings.
see: https://developer.apple.com/documentation/devicemanagement/vpn/dns
Current implementation of removeAllowedIP recreates the wg iface,
killing all open ports and connections. This is due to that "lines" is
the complete output of `get` from wg-usp and not the specific interface
which changes should be applied to.
Carlos Hernandez