1if [ ! "$_NETWORKING_NETMASK_SUBR" ]; then _NETWORKING_NETMASK_SUBR=1 2# 3# Copyright (c) 2006-2012 Devin Teske 4# All Rights Reserved. 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, THE 17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20# DAMAGES (INLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25# SUCH DAMAGE. 26# 27# $FreeBSD$ 28# 29############################################################ INCLUDES 30 31BSDCFG_SHARE="/usr/share/bsdconfig" 32. $BSDCFG_SHARE/common.subr || exit 1 33f_dprintf "%s: loading includes..." networking/netmask.subr 34f_include $BSDCFG_SHARE/dialog.subr 35f_include $BSDCFG_SHARE/strings.subr 36f_include $BSDCFG_SHARE/networking/common.subr 37 38BSDCFG_LIBE="/usr/libexec/bsdconfig" APP_DIR="120.networking" 39f_include_lang $BSDCFG_LIBE/$APP_DIR/include/messages.subr 40 41############################################################ FUNCTIONS 42 43# f_ifconfig_netmask $interface 44# 45# Returns the IPv4 subnet mask associated with $interface. 46# 47f_ifconfig_netmask() 48{ 49 local interface="$1" octets 50 octets=$( ifconfig "$interface" 2> /dev/null | awk \ 51 ' 52 BEGIN { found = 0 } 53 ( $1 == "inet" ) \ 54 { 55 printf "%s %s %s %s\n", 56 substr($4,3,2), 57 substr($4,5,2), 58 substr($4,7,2), 59 substr($4,9,2) 60 found = 1 61 exit 62 } 63 END { exit ! found } 64 ' ) || return $FAILURE 65 66 local octet netmask= 67 for octet in $octets; do 68 netmask="$netmask${netmask:+.}$( printf "%u" "0x$octet" )" 69 done 70 echo $netmask 71} 72 73# f_validate_netmask $netmask 74# 75# Returns zero if the given argument (a subnet mask) is of the proper format. 76# 77# The return status for invalid IP address is one of: 78# 1 One or more individual fields within the subnet mask (separated 79# by dots) contains one or more invalid characters. 80# 2 One or more individual fields within the subnet mask are null 81# and/or missing. 82# 3 One or more individual fields within the subnet mask exceeds 83# the maximum of 255 (a full 8-bit register). 84# 4 The subnet mask has either too few or too many fields. 85# 5 One or more individual fields within the subnet mask is an 86# invalid integer (only 0,128,192,224,240,248,252,254,255 are 87# valid integers). 88# 89f_validate_netmask() 90{ 91 local mask="$1" 92 93 ( # Operate within a sub-shell to protect the parent environment 94 95 # Track number of fields for error checking 96 nfields=0 97 98 IFS="." # Split on `dot' 99 for field in $mask; do 100 101 # Return error if the field is null 102 [ "$field" ] || exit 2 103 104 # Return error if not a whole positive integer 105 f_isinteger "$field" || exit 1 106 107 # Return error if the field exceeds 255 108 [ $field -gt 255 ] && exit 3 109 110 # Return error if the field is an invalid integer 111 case "$field" in 112 0|128|192|224|240|248|252|254|255) :;; 113 *) exit 5;; 114 esac 115 116 nfields=$(( $nfields + 1 )) 117 118 done 119 120 [ $nfields -eq 4 ] || exit 4 121 ) 122} 123 124# f_dialog_maskerror $error $netmask 125# 126# Display a msgbox with the appropriate error message for an error returned by 127# the f_validate_netmask function. 128# 129f_dialog_maskerror() 130{ 131 local error="$1" netmask="$2" 132 133 [ ${error:-0} -ne 0 ] || return $SUCCESS 134 135 case "$error" in 136 1) f_show_msg "$msg_ipv4_mask_field_contains_invalid_chars" "$mask";; 137 2) f_show_msg "$msg_ipv4_mask_field_is_null" "$mask";; 138 3) f_show_msg "$msg_ipv4_mask_field_exceeds_max_value" "$mask";; 139 4) f_show_msg "$msg_ipv4_mask_field_missing_or_extra" "$mask";; 140 5) f_show_msg "$msg_ipv4_mask_field_invalid_value" "$mask";; 141 esac 142} 143 144# f_dialog_validate_netmask $netmask 145# 146# Returns zero if the given argument (a subnet mask) is of the proper format. 147# 148# If the subnet mask is determined to be invalid, the appropriate error will be 149# displayed using the f_dialog_maskerror function above. 150# 151f_dialog_validate_netmask() 152{ 153 local netmask="$1" 154 155 f_validate_netmask "$netmask" 156 local retval=$? 157 158 # Produce an appropriate error message if necessary. 159 [ $retval -eq $SUCCESS ] || f_dialog_maskerror $retval "$netmask" 160 161 return $retval 162} 163 164# f_dialog_input_netmask $interface $netmask 165# 166# Edits the IP netmask of the given interface. 167# 168f_dialog_input_netmask() 169{ 170 local interface="$1" _netmask="$2" _input 171 172 # 173 # Return with-error when there are NFS-mounts currently active. If the 174 # subnet mask is changed while NFS-exported directories are mounted, 175 # the system may hang (if any NFS mounts are using that interface). 176 # 177 if f_nfs_mounted && ! f_jailed; then 178 local setting="$( printf "$msg_current_subnet" \ 179 "$interface" "$_netmask" )" 180 f_show_msg "$msg_nfs_mounts_may_cause_hang" "$setting" 181 return $FAILURE 182 fi 183 184 # 185 # Loop until the user provides taint-free input. 186 # 187 local msg="$( printf "$msg_please_enter_subnet_mask" "$interface" )" 188 while :; do 189 # 190 # Return error status if: 191 # - User has either pressed ESC or chosen Cancel/No 192 # - User has not made any changes to the given value 193 # 194 _input=$( f_dialog_input "$msg" "$_netmask" \ 195 "$hline_num_punc_tab_enter" 196 ) || return 197 [ "$_netmask" = "$_input" ] && return $FAILURE 198 199 # Return success if NULL value was entered 200 [ "$_input" ] || return $SUCCESS 201 202 # Take only the first "word" of the user's input 203 _netmask="$_input" 204 _netmask="${_netmask%%[$IFS]*}" 205 206 # Taint-check the user's input 207 f_dialog_validate_netmask "$_netmask" && break 208 done 209 210 netmask="$_netmask" 211} 212 213############################################################ MAIN 214 215f_dprintf "%s: Successfully loaded." networking/netmask.subr 216 217fi # ! $_NETWORKING_NETMASK_SUBR 218