[Bug 1894172] Re: isc-dhcp-server using wrong env variable for INTERFACES

[Utkarsh Gupta]

** Changed in: isc-dhcp (Ubuntu)
       Status: Triaged => Fix Released

** Also affects: isc-dhcp (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Changed in: isc-dhcp (Ubuntu Groovy)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1894172

Title:
  isc-dhcp-server using wrong env variable for INTERFACES

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Bionic:
  Triaged
Status in isc-dhcp source package in Focal:
  Confirmed
Status in isc-dhcp source package in Groovy:
  Fix Released

Bug description:
  When checking isc-dhcp-server unit file I saw isc-dhcp-server is being
  started by:

  ConditionPathExists=/etc/default/isc-dhcp-server
  ConditionPathExists=|/etc/ltsp/dhcpd.conf
  ConditionPathExists=|/etc/dhcp/dhcpd.conf

  [Service]
  EnvironmentFile=/etc/default/isc-dhcp-server
  RuntimeDirectory=dhcp-server
  # The leases files need to be root:dhcpd even when dropping privileges
  ExecStart=/bin/sh -ec '\
      CONFIG_FILE=/etc/dhcp/dhcpd.conf; \
      if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf; fi; \
      [ -e /var/lib/dhcp/dhcpd.leases ] || touch /var/lib/dhcp/dhcpd.leases; \
      chown root:dhcpd /var/lib/dhcp /var/lib/dhcp/dhcpd.leases; \
      chmod 775 /var/lib/dhcp ; chmod 664 /var/lib/dhcp/dhcpd.leases; \
      exec dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf $CONFIG_FILE $INTERFACES'

  But the /etc/default/isc-dhcp-server file sets $INTERFACESv4 and
  $INTERFACESv6.

  This has only been working because cmdline sets -4 and subnet
  declaration in dhcpd.conf file makes dhcp-server to bind to the
  correct interfaces, as it looks like.

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