Class: Yast::SuSEFirewallProposalClass

Inherits:
Module
  • Object
show all
Includes:
Logger
Defined in:
library/network/src/modules/SuSEFirewallProposal.rb

Instance Method Summary collapse

Instance Method Details

#AddWarning(warning) ⇒ Object

Local function adds another warning string into warnings for user

Parameters:



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 76

def AddWarning(warning)
  @warnings_now = Builtins.add(@warnings_now, warning)

  nil
end

#ClearWarningsObject

Local function clears all warnings for user from memory



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 83

def ClearWarnings
  @warnings_now = []

  nil
end

#EnableFallbackPorts(fallback_ports, zones) ⇒ Object

Enables ports in zones.

Parameters:

  • fallback_ports (Array<String>)

    fallback TCP ports

  • zones (Array<String>)


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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 232

def EnableFallbackPorts(fallback_ports, zones)
  known_zones = SuSEFirewall.GetKnownFirewallZones()
  unknown_zones = zones - known_zones
  raise "Unknown firewall zones #{unknown_zones}" unless unknown_zones.empty?

  log.info "Enabling fallback ports: #{fallback_ports} in zones: #{zones}"
  zones.each do |one_zone|
    fallback_ports.each do |one_port|
      SuSEFirewall.AddService(one_port, "TCP", one_zone)
    end
  end

  nil
end

#GetChangedByUserBoolean

Local function returns if proposal was changed by user

Returns:

  • (Boolean)

    if proposal was changed by user



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 471

def GetChangedByUser
  @proposal_changed_by_user
end

#GetKnownInterfacesArray<String>

Local function returns list [string] of known interfaces. They must have been set using SetKnownInterfaces(list [string] interfaces) function.

Returns:

  • (Array<String>)

    of known interfaces



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 111

def GetKnownInterfaces
  deep_copy(@known_interfaces)
end

#GetProposalInitializedBoolean

Local function returns if proposal was initialized already

Returns:

  • (Boolean)

    if proposal was initialized



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 487

def GetProposalInitialized
  @proposal_initialized
end

#GetWarningsArray<String>

Function returns list of warnings for user

Returns:

  • (Array<String>)

    of warnings



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 92

def GetWarnings
  deep_copy(@warnings_now)
end

#IsDialUpInterface(interface) ⇒ Boolean

Function returns if interface is a dial-up type.

Returns:

  • (Boolean)

    if is dial-up interface



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 118

def IsDialUpInterface(interface)
  all_interfaces = SuSEFirewall.GetAllKnownInterfaces

  interface_type = nil
  Builtins.foreach(all_interfaces) do |one|
    next if Ops.get(one, "id") != interface
    # this is THE interface
    interface_type = Ops.get(one, "type")
  end

  interface_type == "dialup"
end

#IsServiceOrPortsOpen(service, fallback_ports) ⇒ Object

Checks whether the given service or (TCP) ports are open at least in one FW zone.

Parameters:

  • service (String)

    e.g., “service:http-server”

  • fallback_ports (Array<String>)

    e.g., [“80”]



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 280

def IsServiceOrPortsOpen(service, fallback_ports)
  fallback_ports = deep_copy(fallback_ports)
  ret = false

  Builtins.foreach(SuSEFirewall.GetKnownFirewallZones) do |zone|
    # either service is supported
    if SuSEFirewall.IsServiceSupportedInZone(service, zone)
      ret = true
      # or check for ports
    else
      all_ports = true

      # all ports have to be open
      Builtins.foreach(fallback_ports) do |port|
        if !SuSEFirewall.HaveService(port, "TCP", zone)
          all_ports = false
          raise Break
        end
      end

      ret = true if all_ports
    end
    raise Break if ret == true
  end

  ret
end

#IsXenInstalledBoolean

Local function returns whether the Xen kernel is installed

Returns:

  • (Boolean)

    whether xen-capable kernel is installed.



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 347

def IsXenInstalled
  # bug #154133
  return true if Package.Installed("kernel-xen")
  return true if Package.Installed("kernel-xenpae")

  false
end

#mainObject



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 38

def main
  textdomain "base"

  Yast.import "SuSEFirewall"
  Yast.import "ProductFeatures"
  Yast.import "Linuxrc"
  Yast.import "Package"
  Yast.import "SuSEFirewallServices"

  # <!-- SuSEFirewall LOCAL VARIABLES //-->

  # proposal was changed by user
  @proposal_changed_by_user = false

  # proposal was initialized yet
  @proposal_initialized = false

  # known interfaces
  @known_interfaces = []

  # warnings for this "turn"
  @warnings_now = []

  @vnc_fallback_ports = ["5801", "5901"]

  # bnc #427708, yet another name of service
  @vnc_service = "service:xorg-x11-server"

  @ssh_service = "service:sshd"
end

#OpenServiceInInterfaces(service, fallback_ports, interfaces) ⇒ Object

Function opens service for network interfaces given as the third parameter. Fallback ports are used if the given service is uknown. If interfaces are not assigned to any firewall zone, all zones will be used.

Parameters:

  • service (String)

    e.g., “service:http-server”

  • fallback_ports (Array<String>)

    e.g., [“80”]

  • interfaces (Array<String>)

    e.g., [“eth3”]

See Also:



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 256

def OpenServiceInInterfaces(service, fallback_ports, interfaces)
  fallback_ports = deep_copy(fallback_ports)
  interfaces = deep_copy(interfaces)
  zones = SuSEFirewall.GetZonesOfInterfaces(interfaces)

  # Interfaces might not be assigned to any zone yet, use all zones
  zones = SuSEFirewall.GetKnownFirewallZones() if zones.empty?

  if SuSEFirewallServices.IsKnownService(service)
    log.info "Opening service #{service} on interfaces #{interfaces} (zones #{zones})"
    SuSEFirewall.SetServicesForZones([service], zones, true)
  else
    log.warn "Unknown service #{service}, enabling fallback ports"
    EnableFallbackPorts(fallback_ports, zones)
  end

  nil
end

#OpenServiceOnNonDialUpInterfaces(service, fallback_ports) ⇒ Object

Function opens up the service on all non-dial-up network interfaces. If there are no network interfaces known and the 'any' feature is supported, function opens the service for the zone supporting that feature. If there are only dial-up interfaces, function opens the service for them.

Parameters:

  • service (String)

    such as “service:koo” or “serice:boo”

  • fallback_ports (Array<String>)

    list of ports used as a fallback if the given service doesn't exist



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 315

def OpenServiceOnNonDialUpInterfaces(service, fallback_ports)
  fallback_ports = deep_copy(fallback_ports)
  non_dial_up_interfaces = SuSEFirewall.GetAllNonDialUpInterfaces
  dial_up_interfaces = SuSEFirewall.GetAllDialUpInterfaces

  # Opening the service for non-dial-up interfaces
  if Ops.greater_than(Builtins.size(non_dial_up_interfaces), 0)
    OpenServiceInInterfaces(service, fallback_ports, non_dial_up_interfaces)
    # Only dial-up network interfaces, there mustn't be any non-dial-up one
  elsif Ops.greater_than(Builtins.size(dial_up_interfaces), 0)
    OpenServiceInInterfaces(service, fallback_ports, dial_up_interfaces)
    # No network interfaces are known
  elsif Builtins.size(@known_interfaces) == 0
    if SuSEFirewall.IsAnyNetworkInterfaceSupported == true
      Builtins.y2warning(
        "WARNING: Opening %1 for the External zone without any known interface!",
        Builtins.toupper(service)
      )
      OpenServiceInInterfaces(
        service,
        fallback_ports,
        [SuSEFirewall.special_all_interface_string]
      )
    end
  end

  nil
end

#ProposalSummaryHash{String => String}

Function returns the proposal summary

*Structure:*

map $[
	"output" : "HTML Proposal Summary",
	"warning" : "HTML Warning Summary",
 ]

Returns:



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 536

def ProposalSummary
  # output: $[ "output" : "HTML Proposal", "warning" : "HTML Warning" ];
  output = ""
  warning = ""

  # SuSEfirewall2 package needn't be installed
  if !SuSEFirewall.SuSEFirewallIsInstalled
    # TRANSLATORS: Proposal informative text
    output = "<ul>" +
      _(
        "SuSEfirewall2 package is not installed, firewall will be disabled."
      ) + "</ul>"

    return { "output" => output, "warning" => warning }
  end

  # SuSEfirewall2 is installed...

  firewall_is_enabled = SuSEFirewall.GetEnableService == true

  output = Ops.add(output, "<ul>\n")
  output = Ops.add(
    Ops.add(
      Ops.add(output, "<li>"),
      if firewall_is_enabled
        # TRANSLATORS: Proposal informative text "Firewall is enabled (disable)" with link around
        # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
        _(
          "Firewall is enabled (<a href=\"firewall--disable_firewall_in_proposal\">disable</a>)"
        )
      else
        # TRANSLATORS: Proposal informative text "Firewall is disabled (enable)" with link around
        # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
        _(
          "Firewall is disabled (<a href=\"firewall--enable_firewall_in_proposal\">enable</a>)"
        )
      end
    ),
    "</li>\n"
  )

  if firewall_is_enabled
    # Any enabled SSH means SSH-is-enabled
    is_ssh_enabled = false

    # Any known interfaces
    if Ops.greater_than(Builtins.size(@known_interfaces), 0)
      Builtins.y2milestone("Interfaces: %1", @known_interfaces)

      # all known interfaces for testing
      used_zones = SuSEFirewall.GetZonesOfInterfacesWithAnyFeatureSupported(
        @known_interfaces
      )
      Builtins.y2milestone("Zones used by firewall: %1", used_zones)

      Builtins.foreach(used_zones) do |zone|
        if SuSEFirewall.IsServiceSupportedInZone(@ssh_service, zone) ||
            SuSEFirewall.HaveService("ssh", "TCP", zone)
          is_ssh_enabled = true
        end
      end

      output = Ops.add(
        Ops.add(
          Ops.add(output, "<li>"),
          if is_ssh_enabled
            # TRANSLATORS: Network proposal informative text with link around
            # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
            _(
              "SSH port is open (<a href=\"firewall--disable_ssh_in_proposal\">close</a>)"
            )
          else
            # TRANSLATORS: Network proposal informative text with link around
            # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
            _(
              "SSH port is blocked (<a href=\"firewall--enable_ssh_in_proposal\">open</a>)"
            )
          end
        ),
        "</li>\n"
      )

      # No known interfaces, but 'any' is supported
      # and ssh is enabled there
    elsif SuSEFirewall.IsAnyNetworkInterfaceSupported &&
        SuSEFirewall.IsServiceSupportedInZone(
          @ssh_service,
          SuSEFirewall.special_all_interface_zone
        )
      is_ssh_enabled = true
      # TRANSLATORS: Network proposal informative text with link around
      # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
      output = Ops.add(
        Ops.add(
          Ops.add(output, "<li>"),
          _(
            "SSH port is open (<a href=\"firewall--disable_ssh_in_proposal\">close</a>), but\nthere are no network interfaces configured"
          )
        ),
        "</li>"
      )
    end
    Builtins.y2milestone(
      "SSH is " + (is_ssh_enabled ? "" : "not ") + "enabled"
    )

    if Linuxrc.usessh
      if !is_ssh_enabled
        # TRANSLATORS: This is a warning message. Installation over SSH without SSH allowed on firewall
        AddWarning(
          _(
            "You are installing a system over SSH, but you have not opened the SSH port on the firewall."
          )
        )
      end
    end

    # when the firewall is enabled and we are installing the system over VNC
    if Linuxrc.vnc
      # Any enabled VNC means VNC-is-enabled
      is_vnc_enabled = false
      if Ops.greater_than(Builtins.size(@known_interfaces), 0)
        Builtins.foreach(
          SuSEFirewall.GetZonesOfInterfacesWithAnyFeatureSupported(
            @known_interfaces
          )
        ) do |zone|
          if SuSEFirewall.IsServiceSupportedInZone(@vnc_service, zone) == true
            is_vnc_enabled = true
            # checking also fallback ports
          else
            set_vnc_enabled_to = true
            Builtins.foreach(@vnc_fallback_ports) do |one_port|
              if SuSEFirewall.HaveService(one_port, "TCP", zone) != true
                set_vnc_enabled_to = false
                raise Break
              end
              is_vnc_enabled = true if set_vnc_enabled_to == true
            end
          end
        end
      end
      Builtins.y2milestone(
        "VNC port is " + (is_vnc_enabled ? "open" : "blocked") + " in the firewall"
      )

      output = Ops.add(
        Ops.add(
          Ops.add(output, "<li>"),
          if is_vnc_enabled
            # TRANSLATORS: Network proposal informative text "Remote Administration (VNC) is enabled" with link around
            # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
            _(
              "Remote Administration (VNC) ports are open (<a href=\"firewall--disable_vnc_in_proposal\">close</a>)"
            )
          else
            # TRANSLATORS: Network proposal informative text "Remote Administration (VNC) is disabled" with link around
            # IMPORTANT: Please, do not change the HTML link <a href="...">...</a>, only visible text
            _(
              "Remote Administration (VNC) ports are blocked (<a href=\"firewall--enable_vnc_in_proposal\">open</a>)"
            )
          end
        ),
        "</li>\n"
      )

      if !is_vnc_enabled
        # TRANSLATORS: This is a warning message. Installation over VNC without VNC allowed on firewall
        AddWarning(
          _(
            "You are installing a system using remote administration (VNC), but you have not opened the VNC ports on the firewall."
          )
        )
      end
    end

    if Linuxrc.useiscsi
      is_iscsi_enabled = IsServiceOrPortsOpen(
        @iscsi_target_service,
        @iscsi_target_fallback_ports
      )

      output = Ops.add(
        Ops.add(
          Ops.add(output, "<li>"),
          if is_iscsi_enabled
            # TRANSLATORS: Network proposal informative text
            _("iSCSI Target ports are open")
          else
            # TRANSLATORS: Network proposal informative text
            _("iSCSI Target ports are blocked")
          end
        ),
        "</li>\n"
      )

      if !is_iscsi_enabled
        # TRANSLATORS: This is a warning message. Installation to iSCSI without iSCSI allowed on firewall
        AddWarning(
          _(
            "You are installing a system using iSCSI Target, but you have not opened the needed ports on the firewall."
          )
        )
      end
    end

    warnings_strings = GetWarnings()
    if Ops.greater_than(Builtins.size(warnings_strings), 0)
      ClearWarnings()
      Builtins.foreach(warnings_strings) do |single_warning|
        warning = Ops.add(
          Ops.add(Ops.add(warning, "<li>"), single_warning),
          "</li>\n"
        )
      end
      warning = Ops.add(Ops.add("<ul>\n", warning), "</ul>\n")
    end
  end

  output = Ops.add(output, "</ul>\n")

  { "output" => output, "warning" => warning }
end

#Proposevoid

This method returns an undefined value.

Function proposes the SuSEfirewall2 configuration



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 504

def Propose
  # No proposal when SuSEfirewall2 is not installed
  if !SuSEFirewall.SuSEFirewallIsInstalled
    SuSEFirewall.SetEnableService(false)
    SuSEFirewall.SetStartService(false)
    return nil
  end

  # Not changed by user - Propose from scratch
  if !GetChangedByUser()
    Builtins.y2milestone("Calling firewall configuration proposal")
    Reset()
    ProposeFunctions()
    # Changed - don't break user's configuration
  else
    Builtins.y2milestone("Calling firewall configuration update proposal")
    UpdateProposal()
  end

  nil
end

#ProposeFunctionsObject

Local function for proposing firewall configuration.



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 356

def ProposeFunctions
  known_interfaces = SuSEFirewall.GetAllKnownInterfaces

  dial_up_interfaces = []
  non_dup_interfaces = []
  Builtins.foreach(known_interfaces) do |interface|
    if Ops.get(interface, "type") == "dial_up"
      dial_up_interfaces = Builtins.add(
        dial_up_interfaces,
        Ops.get(interface, "id", "")
      )
    else
      non_dup_interfaces = Builtins.add(
        non_dup_interfaces,
        Ops.get(interface, "id", "")
      )
    end
  end

  Builtins.y2milestone(
    "Proposal based on configuration: Dial-up interfaces: %1, Other: %2",
    dial_up_interfaces,
    non_dup_interfaces
  )

  # has any network interface
  if Builtins.size(non_dup_interfaces) == 0 ||
      Builtins.size(dial_up_interfaces) == 0
    SuSEFirewall.SetEnableService(
      ProductFeatures.GetBooleanFeature("globals", "enable_firewall")
    )
    SuSEFirewall.SetStartService(
      ProductFeatures.GetBooleanFeature("globals", "enable_firewall")
    )
  end

  # has non-dial-up and also dial-up interfaces
  if Ops.greater_than(Builtins.size(non_dup_interfaces), 0) &&
      Ops.greater_than(Builtins.size(dial_up_interfaces), 0)
    SetInterfacesToZone(non_dup_interfaces, "INT")
    SetInterfacesToZone(dial_up_interfaces, "EXT")
    if ProductFeatures.GetBooleanFeature("globals", "firewall_enable_ssh")
      SuSEFirewall.SetServicesForZones([@ssh_service], ["INT", "EXT"], true)
    end

    # has non-dial-up and doesn't have dial-up interfaces
  elsif Ops.greater_than(Builtins.size(non_dup_interfaces), 0) &&
      Builtins.size(dial_up_interfaces) == 0
    SetInterfacesToZone(non_dup_interfaces, "EXT")
    if ProductFeatures.GetBooleanFeature("globals", "firewall_enable_ssh")
      SuSEFirewall.SetServicesForZones([@ssh_service], ["EXT"], true)
    end

    # doesn't have non-dial-up and has dial-up interfaces
  elsif Builtins.size(non_dup_interfaces) == 0 &&
      Ops.greater_than(Builtins.size(dial_up_interfaces), 0)
    SetInterfacesToZone(dial_up_interfaces, "EXT")
    if ProductFeatures.GetBooleanFeature("globals", "firewall_enable_ssh")
      SuSEFirewall.SetServicesForZones([@ssh_service], ["EXT"], true)
    end
  end

  # Dial-up interfaces are considered to be internal,
  # Non-dial-up are considered to be external.
  # If there are only Non-dial-up interfaces, they are all considered as external.
  #
  # VNC Installation proposes to open VNC Access up on the Non-dial-up interfaces only.
  # SSH Installation is the same case...
  if Linuxrc.vnc
    Builtins.y2milestone(
      "This is an installation over VNC, opening VNC on all non-dial-up interfaces..."
    )
    # Try the service first, then ports
    # bnc #398855
    OpenServiceOnNonDialUpInterfaces(@vnc_service, @vnc_fallback_ports)
  end
  if Linuxrc.usessh
    Builtins.y2milestone(
      "This is an installation over SSH, opening SSH on all non-dial-up interfaces..."
    )
    # Try the service first, then ports
    # bnc #398855
    OpenServiceOnNonDialUpInterfaces(@ssh_service, ["ssh"])
  end

  # Firewall support for XEN domain0
  if IsXenInstalled()
    Builtins.y2milestone(
      "Adding Xen support into the firewall configuration"
    )
    SuSEFirewall.AddXenSupport
  end

  SetKnownInterfaces(SuSEFirewall.GetListOfKnownInterfaces)

  nil
end

#Resetvoid

This method returns an undefined value.

Function fills up default configuration into internal values



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 494

def Reset
  SuSEFirewall.ResetReadFlag
  SuSEFirewall.Read

  nil
end

#ServiceEnabled(service, zones) ⇒ Boolean

Returns whether service is enabled in zones.

Parameters:

Returns:

  • (Boolean)

    if enabled



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 198

def ServiceEnabled(service, zones)
  zones = deep_copy(zones)
  if service.nil? || service == ""
    Builtins.y2error("Ups, service: %1?", service)
    return false
  end

  if zones.nil? || zones == []
    Builtins.y2error("Ups, zones: %1?", zones)
    return false
  end

  serenabled = true

  serstat = SuSEFirewall.GetServices([service])
  Builtins.foreach(zones) do |one_zone|
    if Ops.get(serstat, [service, one_zone]) == false
      Builtins.y2milestone(
        "Service %1 is not enabled in %2",
        service,
        one_zone
      )
      serenabled = false
      raise Break
    end
  end

  serenabled
end

#SetChangedByUser(changed) ⇒ Object

Function sets that proposal was changed by user

Parameters:

  • changed (true, false)

    if changed by user



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 461

def SetChangedByUser(changed)
  Builtins.y2milestone("Proposal was changed by user")
  @proposal_changed_by_user = changed

  nil
end

#SetInterfacesToZone(interfaces, zone) ⇒ Object

Local function adds list of interfaces into zone.

Parameters:



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 135

def SetInterfacesToZone(interfaces, zone)
  interfaces = deep_copy(interfaces)
  Builtins.foreach(interfaces) do |interface|
    SuSEFirewall.AddInterfaceIntoZone(interface, zone)
  end

  nil
end

#SetKnownInterfaces(interfaces) ⇒ Object

Local function sets currently known interfaces.

Parameters:

  • interfaces (Array<String>)

    list of known interfaces



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 99

def SetKnownInterfaces(interfaces)
  interfaces = deep_copy(interfaces)
  @known_interfaces = deep_copy(interfaces)

  nil
end

#SetProposalInitialized(initialized) ⇒ Object

Function sets that proposal was initialized

Parameters:

  • initialized (true, false)

    if initialized



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 478

def SetProposalInitialized(initialized)
  @proposal_initialized = initialized

  nil
end

#UpdateProposalObject

Local function for updating user-changed proposal.



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# File 'library/network/src/modules/SuSEFirewallProposal.rb', line 145

def UpdateProposal
  last_known_interfaces = GetKnownInterfaces()
  currently_known_interfaces = SuSEFirewall.GetListOfKnownInterfaces

  had_dialup_interfaces = false
  Builtins.foreach(last_known_interfaces) do |this_interface|
    if IsDialUpInterface(this_interface)
      had_dialup_interfaces = true
      raise Break
    end
  end

  Builtins.foreach(currently_known_interfaces) do |interface|
    # already known but not assigned
    next if Builtins.contains(last_known_interfaces, interface)
    # already configured in some zone
    next if !SuSEFirewall.GetZoneOfInterface(interface).nil?
    # any dial-up interfaces presented and the new one isn't dial-up
    if had_dialup_interfaces && !IsDialUpInterface(interface)
      AddWarning(
        Builtins.sformat(
          # TRANSLATORS: Warning in installation proposal, %1 is a device name (eth0, sl0, ...)
          _(
            "New network device '%1' found; added as an internal firewall interface"
          ),
          interface
        )
      )
      SetInterfacesToZone([interface], "INT")
    else
      AddWarning(
        Builtins.sformat(
          # TRANSLATORS: Warning in installation proposal, %1 is a device name (eth0, sl0, ...)
          _(
            "New network device '%1' found; added as an external firewall interface"
          ),
          interface
        )
      )
      SetInterfacesToZone([interface], "EXT")
    end
  end

  SetKnownInterfaces(currently_known_interfaces)

  nil
end