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|
if [ ! "$_NETWORKING_NETMASK_SUBR" ]; then _NETWORKING_NETMASK_SUBR=1
#
# Copyright (c) 2006-2012 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 (INLUDING, 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.
#
# $FreeBSD$
#
############################################################ 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/strings.subr
f_include $BSDCFG_SHARE/networking/common.subr
BSDCFG_LIBE="/usr/libexec/bsdconfig" APP_DIR="120.networking"
f_include_lang $BSDCFG_LIBE/$APP_DIR/include/messages.subr
############################################################ FUNCTIONS
# f_ifconfig_netmask $interface
#
# Returns the IPv4 subnet mask associated with $interface.
#
f_ifconfig_netmask()
{
local interface="$1" octets
octets=$( ifconfig "$interface" 2> /dev/null | awk \
'
BEGIN { found = 0 }
( $1 == "inet" ) \
{
printf "%s %s %s %s\n",
substr($4,3,2),
substr($4,5,2),
substr($4,7,2),
substr($4,9,2)
found = 1
exit
}
END { exit ! found }
' ) || return $FAILURE
local octet netmask=
for octet in $octets; do
netmask="$netmask${netmask:+.}$( printf "%u" "0x$octet" )"
done
echo $netmask
}
# f_validate_netmask $netmask
#
# Returns zero if the given argument (a subnet mask) is of the proper format.
#
# The return status for invalid IP address is one of:
# 1 One or more individual fields within the subnet mask (separated
# by dots) contains one or more invalid characters.
# 2 One or more individual fields within the subnet mask are null
# and/or missing.
# 3 One or more individual fields within the subnet mask exceeds
# the maximum of 255 (a full 8-bit register).
# 4 The subnet mask has either too few or too many fields.
# 5 One or more individual fields within the subnet mask is an
# invalid integer (only 0,128,192,224,240,248,252,254,255 are
# valid integers).
#
f_validate_netmask()
{
local mask="$1"
( # Operate within a sub-shell to protect the parent environment
# Track number of fields for error checking
nfields=0
IFS="." # Split on `dot'
for field in $mask; do
# Return error if the field is null
[ "$field" ] || exit 2
# Return error if not a whole positive integer
f_isinteger "$field" || exit 1
# Return error if the field exceeds 255
[ $field -gt 255 ] && exit 3
# Return error if the field is an invalid integer
case "$field" in
0|128|192|224|240|248|252|254|255) :;;
*) exit 5;;
esac
nfields=$(( $nfields + 1 ))
done
[ $nfields -eq 4 ] || exit 4
)
}
# 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="$2" _input
#
# Return with-error when there are NFS-mounts currently active. If the
# subnet mask is changed while NFS-exported directories are mounted,
# the system may hang (if any NFS mounts are using that interface).
#
if f_nfs_mounted && ! f_jailed; then
local setting="$( printf "$msg_current_subnet" \
"$interface" "$_netmask" )"
f_show_msg "$msg_nfs_mounts_may_cause_hang" "$setting"
return $FAILURE
fi
#
# Loop until the user provides taint-free input.
#
local msg="$( printf "$msg_please_enter_subnet_mask" "$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
#
_input=$( f_dialog_input "$msg" "$_netmask" \
"$hline_num_punc_tab_enter"
) || return
[ "$_netmask" = "$_input" ] && return $FAILURE
# Return success if NULL value was entered
[ "$_input" ] || return $SUCCESS
# Take only the first "word" of the user's input
_netmask="$_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
|
