Public bug reported:
[impact]
a systemd with a 64-character hostname (the maximum hostname length for
Linux) will cause a dhcp server to reject its dhcp lease due to passing
the invalid hostname in the dhcp lease request.
[test case]
$ cat /etc/systemd/network/10-ens3.network
[Match]
Name=ens3
[Network]
DHCP=yes
set hostname to 64-char name, e.g.:
$ sudo hostnamectl set-hostname
a123456789b123456789c123456789d123456789e123456789f123456789g123
restart networkd:
$ sudo systemctl restart systemd-networkd
check logs:
root@a123456789b123456789c123456789d123456789e123456789f123456789g123:~#
journalctl -b -u systemd-networkd --no-pager | grep 'DHCP error'
May 06 19:01:30
a123456789b123456789c123456789d123456789e123456789f123456789g123
systemd-networkd[737]: ens3: DHCP error: Client failed: Invalid argument
[scope]
this is fixed by commit 9740eae694e93b06658ff3b3045b22b591561e7c which
is included in Bionic and later. This is needed only for Xenial.
[other info]
this is a follow on to bug 1862232, which corrected sd-dhcp-client.c to
continue networkd dhcp even if the hostname is invalid, however the
older code in Xenial doesn't correctly detect the invalid hostname, so
this additional patch is needed.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: systemd (Ubuntu Xenial)
Importance: Medium
Assignee: Dan Streetman (ddstreet)
Status: In Progress
** Also affects: systemd (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu)
Status: New => Fix Released
** Changed in: systemd (Ubuntu Xenial)
Assignee: (unassigned) => Dan Streetman (ddstreet)
** Changed in: systemd (Ubuntu Xenial)
Importance: Undecided => Medium
** Changed in: systemd (Ubuntu Xenial)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1877176
Title:
64-char hostname causes dhcp server to reject lease
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