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feat(host): PUNKTFUNK_HOST_NAME names the host in Moonlight and the clients

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A box called `bazzite-htpc` had no way to present itself as "Living Room"
short of renaming the machine. The new knob overrides the name everywhere
a human sees it: the GameStream serverinfo <hostname> element and the
mDNS service instance name both adverts carry. Unset (the default) is the
machine's own hostname, exactly as before.

Free text is the point, so the DNS-level name is now a separate concern
from the display name. The instance label may contain spaces and accents;
an A-record target may not, and mdns-sd rejects the whole ServiceInfo if
the target is not a legal name — which would take discovery down rather
than merely look wrong. dns_label() sanitizes the target and passes an
already-legal name through byte-for-byte, so hosts without the override
advertise precisely what they always did. The display name loses `.` (it
would split the label, and clients derive the name as the first label of
the fullname, so "Ben's PC v1.2" would arrive as "Ben's PC v1") and is
capped at the 63-byte DNS-SD ceiling on a char boundary.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
(cherry picked from commit bbf72261a12e0e67601f549d40db65ae61979268)
This commit is contained in:
enricobuehler
2026-07-28 17:01:59 +02:00
parent 40714317a8
commit b444308592
8 changed files with 134 additions and 4 deletions
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@@ -126,6 +126,7 @@ See your desktop page ([KDE](/docs/kde), [GNOME](/docs/gnome)) for when to set t
| Setting | Values | Meaning |
|---|---|---|
| `PUNKTFUNK_HOST_NAME` | free text, e.g. `Living Room` | The name this host shows up under in Moonlight and in the Punktfunk clients. Default: the machine's own hostname — so a box called `bazzite-htpc` can present itself as `Living Room` without renaming the machine. Takes effect on host restart. Spaces and accents are fine; `.` becomes `-` (a dot would split the name in client lists) and it's capped at 63 characters. The machine's real hostname is still what the host answers to on the network. |
| `PUNKTFUNK_MDNS` | `1` · `0` *(default on)* | mDNS adverts (native + GameStream). `0` skips them (same as `--no-mdns`) — for networks/containers where multicast doesn't work; add the host by address in the client instead. |
| `PUNKTFUNK_DATA_PORT` | port | Pin the per-session video data plane to a fixed UDP port and stream direct (no hole-punch) — open exactly that port in the host firewall. Same as `serve --data-port`; see [Troubleshooting](/docs/troubleshooting). Default: random port + hole-punch. |