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validate hostname value lengths

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This commit is contained in:
Jake Buchholz Göktürk 2025-05-29 19:31:34 -07:00
parent daa31db54e
commit 3aabf9f83e
2 changed files with 14 additions and 5 deletions
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3
CHANGELOG.md
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@ -6,6 +6,9 @@
* Alpine autoinstall - allow override disk and reboot and set swap (@ncopa)
* Warn when hostname is too long (per RFC-1035) instead of setting invalid
value.
## 2024-12-03 - Tiny Cloud v3.1.0

16
lib/tiny-cloud/init
View File

@ -226,13 +226,19 @@ init__set_hostname() {
log -i -t "$phase" info "$ACTION: no hostname set"
return
fi
local host="${fqdn%%\.*}"
if [ -z "$host" ]; then
log -i -t "$phase" warning "$ACTION: invalid hostname '$fqdn'"
if [ ${#fqdn} -gt 255 ]; then
log -i -t "$phase" warning "$ACTION: hostname exceeds 255 chars '$fqdn'"
return 1
fi
local host="${fqdn%%\.*}"
if [ -z "$host" ]; then
log -i -t "$phase" warning "$ACTION: unable to extract short hostname from '$fqdn'"
return 1
fi
if [ ${#host} -gt 63 ]; then
log -i -t "$phase" warning "$ACTION: short hostname exceeds 63 chars '$host'"
return 1
fi
mkdir -p "$ETC"
echo "$host" > "$ETC"/hostname
$MOCK hostname -F "$ETC"/hostname