[RTEMS Project] #3574: DHCP request includes host name option even if hostname is zero length

[RTEMS trac]

#3574: DHCP request includes host name option even if hostname is zero length
-----------------------------+---------------------------
  Reporter:  Sal             |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  normal          |  Milestone:
 Component:  network/legacy  |    Version:  5
  Severity:  normal          |   Keywords:  DHCP hostname
Blocked By:                  |   Blocking:
-----------------------------+---------------------------
 DHCP requests add the hostname option in dhcp_request_req() without
 checking its length, so the hostname can be of any length. This is a
 defect because the DHCP spec (​https://tools.ietf.org/html/rfc2132)
 requires the hostname to have a minimum length of 1 char.
 This appears to trigger a bug in a specific Netgear router that causes
 it's DHCP process to lock up and could affect other things as well.

 This bug can be solved applying the patch made by Aun-Ali Zaidi in the
 original ticket reporting this defect
 (​https://devel.rtems.org/ticket/1405) that was never applied.
 I've been able to compile the code with the patch applied and it didn't
 raise any warnings.

 Original ticket: ​https://devel.rtems.org/ticket/1405

--
Ticket URL: <http://devel.rtems.org/ticket/3574>
RTEMS Project <http://www.rtems.org/>
RTEMS Project