if [ ! "$_NETWORKING_NETMASK_SUBR" ]; then _NETWORKING_NETMASK_SUBR=1
#
# Copyright (c) 2006-2013 Devin Teske
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
############################################################ INCLUDES

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_dprintf "%s: loading includes..." networking/netmask.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/networking/common.subr
f_include $BSDCFG_SHARE/strings.subr

BSDCFG_LIBE="/usr/libexec/bsdconfig" APP_DIR="120.networking"
f_include_lang $BSDCFG_LIBE/$APP_DIR/include/messages.subr

############################################################ FUNCTIONS

# f_dialog_maskerror $error $netmask
#
# Display a msgbox with the appropriate error message for an error returned by
# the f_validate_netmask function.
#
f_dialog_maskerror()
{
	local error="$1" netmask="$2"

	[ ${error:-0} -ne 0 ] || return $SUCCESS

	case "$error" in
	1) f_show_msg "$msg_ipv4_mask_field_contains_invalid_chars" "$mask" ;;
	2) f_show_msg "$msg_ipv4_mask_field_is_null" "$mask" ;;
	3) f_show_msg "$msg_ipv4_mask_field_exceeds_max_value" "$mask" ;;
	4) f_show_msg "$msg_ipv4_mask_field_missing_or_extra" "$mask" ;;
	5) f_show_msg "$msg_ipv4_mask_field_invalid_value" "$mask" ;;
	esac
}

# f_dialog_validate_netmask $netmask
#
# Returns zero if the given argument (a subnet mask) is of the proper format.
#
# If the subnet mask is determined to be invalid, the appropriate error will be
# displayed using the f_dialog_maskerror function above.
#
f_dialog_validate_netmask()
{
	local netmask="$1"

	f_validate_netmask "$netmask"
	local retval=$?

	# Produce an appropriate error message if necessary.
	[ $retval -eq $SUCCESS ] || f_dialog_maskerror $retval "$netmask"

	return $retval
}

# f_dialog_input_netmask $interface $netmask
#
# Edits the IP netmask of the given interface.
#
f_dialog_input_netmask()
{
	local interface="$1" _netmask="$2" _input

	#
	# Return with-error when there are NFS-mounts currently active. If the
	# subnet mask is changed while NFS-exported directories are mounted,
	# the system may hang (if any NFS mounts are using that interface).
	#
	if f_nfs_mounted && ! f_jailed; then
		local setting
		f_sprintf setting "$msg_current_subnet" \
		                  "$interface" "$_netmask"
		f_noyes "$msg_nfs_mounts_may_cause_hang" "$setting" ||
			return $DIALOG_CANCEL
	fi

	#
	# Loop until the user provides taint-free input.
	#
	local msg
	f_sprintf msg "$msg_please_enter_subnet_mask" "$interface"
	while :; do
		#
		# Return error status if:
		# - User has either pressed ESC or chosen Cancel/No
		# - User has not made any changes to the given value
		#
		f_dialog_input _input "$msg" "$_netmask" \
		               "$hline_num_punc_tab_enter" || return $?
		[ "$_netmask" = "$_input" ] && return $DIALOG_CANCEL

		# Return success if NULL value was entered
		[ "$_input" ] || return $DIALOG_OK

		# Take only the first "word" of the user's input
		_netmask="$_input"
		_netmask="${_netmask%%[$IFS]*}"

		# Taint-check the user's input
		f_dialog_validate_netmask "$_netmask" && break
	done

	netmask="$_netmask"
}

############################################################ MAIN

f_dprintf "%s: Successfully loaded." networking/netmask.subr

fi # ! $_NETWORKING_NETMASK_SUBR