group.of.nepali.translators team mailing list archive

[Dan Streetman <ddstreet@xxxxxxxxxxxxx>]

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

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress

Bug description:
  [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.

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