Send all available hostname sources (ComputerName, LocalHostName,
HostName, os.Hostname) in the metadata map when provisioning.
This allows the API to detect and repair generic hostnames like
'Mac' by picking the best available source server-side.
Belt and suspenders: preferredHostname() picks the right one
client-side, but metadata gives the API a second chance.
macOS Sequoia with Private Wi-Fi Address enabled causes os.Hostname()
to return generic names like "Mac.lan" from DHCP instead of the real
computer name. The /utility provisioning endpoint sends this raw,
resulting in devices named "Mac-lan" in the dashboard.
Fallback chain: ComputerName → LocalHostName → os.Hostname()
LocalHostName can also be affected by DHCP. ComputerName is the
user-set display name from System Settings, fully immune to network state.
So we don't have to depend on network stack probing to decide whether
ipv4 or ipv6 will be used.
While at it, also prevent a race report when doing the same parallel
resolving for os resolver, even though this race is harmless.
The bootstrap process has two issues that can make ctrld stop resolving
after restarting machine host.
ctrld uses bootstrap DNS and os nameservers for resolving upstream. On
unix, /etc/resolv.conf content is used to get available nameservers.
This works well when installing ctrld. However, after being installed,
ctrld may modify the content of /etc/resolv.conf itself, to make other
apps use its listener as DNS resolver. So when ctrld starts after OS
restart, it ends up using [bootstrap DNS + ctrld's listener], for
resolving upstream. At this moment, if ctrld could not contact bootstrap
DNS for any reason, upstream domain will not be resolved.
For above reason, an upstream may not have bootstrap IPs after ctrld
starts. When re-bootstrapping, if there's no bootstrap IPs, ctrld should
call the setup bootstrap process again. Currently, it does not, causing
all queries failed.
This commit fixes above issue by adding mechanism for retrieving OS
nameservers properly, by querying routing table information:
- Parsing /proc/net subsystem on Linux.
- For BSD variants, just fetching routing information base from OS.
- On Windows, just include the gateway information when reading iface.
The fixing for second issue is trivial, just kickoff a bootstrap process
if there's no bootstrap IPs when re-boostrapping.
While at it, also ensure that fetching resolver information from
ControlD API is also used the same approach.
Fixes#34
If ctrld setup the interface correctly, the interface DNS is set to
ctrld listener address. At boot time, the ctrld is not up yet, so it
would break the processing Control D config fetching.
Fixing this by waiting for network up before doing the query.
