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|
if [ ! "$_NETWORKING_HOSTNAME_SUBR" ]; then _NETWORKING_HOSTNAME_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/hostname.subr
f_include $BSDCFG_SHARE/sysrc.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/networking/common.subr
f_include $BSDCFG_SHARE/networking/resolv.subr
BSDCFG_LIBE="/usr/libexec/bsdconfig" APP_DIR="120.networking"
f_include_lang $BSDCFG_LIBE/$APP_DIR/include/messages.subr
############################################################ FUNCTIONS
# f_validate_hostname $hostname
#
# Returns zero if the given argument (a fully-qualified hostname) is compliant
# with standards set-forth in RFC's 952 and 1123 of the Network Working Group:
#
# RFC 952 - DoD Internet host table specification
# http://tools.ietf.org/html/rfc952
#
# RFC 1123 - Requirements for Internet Hosts - Application and Support
# http://tools.ietf.org/html/rfc1123
#
# See http://en.wikipedia.org/wiki/Hostname for a brief overview.
#
# The return status for invalid hostnames is one of:
# 255 Entire hostname exceeds the maximum length of 255 characters.
# 63 One or more individual labels within the hostname (separated by
# dots) exceeds the maximum of 63 characters.
# 1 One or more individual labels within the hostname contains one
# or more invalid characters.
# 2 One or more individual labels within the hostname starts or
# ends with a hyphen (hyphens are allowed, but a label cannot
# begin or end with a hyphen).
# 3 One or more individual labels within the hostname are null.
#
# If the hostname is determined to be invalid, the appropriate error will be
# displayed using the f_show_msg function.
#
f_validate_hostname()
{
local fqhn="$1"
( # Operate within a sub-shell to protect the parent environment
# Return error if the hostname exceeds 255 characters
[ ${#fqhn} -gt 255 ] && exit 255
IFS="." # Split on `dot'
for label in $fqhn; do
# Return error if the label exceeds 63 characters
[ ${#label} -gt 63 ] && exit 63
# Return error if the label is null
[ "$label" ] || exit 3
# Return error if label begins/ends with dash
case "$label" in
-*|*-) exit 2
esac
# Return error if the label contains any invalid chars
echo "$label" | grep -q '^[[:alnum:]-]*$' || exit 1
done
)
}
# f_dialog_hnerror $error $hostname
#
# Display a msgbox with the appropriate error message for an error returned by
# the f_validate_hostname function.
#
f_dialog_hnerror()
{
local error="$1" fqhn="$2"
[ ${error:-0} -ne 0 ] || return $SUCCESS
case "$error" in
1) f_show_msg "$msg_hostname_label_contains_invalid_chars" "$fqhn";;
2) f_show_msg "$msg_hostname_label_starts_or_ends_with_hyphen" "$fqhn";;
3) f_show_msg "$msg_hostname_label_is_null" "$fqhn";;
63) f_show_msg "$msg_hostname_label_exceeds_max_length" "$fqhn";;
255) f_show_msg "$msg_hostname_exceeds_max_length" "$fqhn";;
esac
}
# f_dialog_validate_hostname $hostname
#
# Returns zero if the given argument (a fully-qualified hostname) is compliant
# with standards set-forth in RFC's 952 and 1123 of the Network Working Group:
#
# RFC 952 - DoD Internet host table specification
# http://tools.ietf.org/html/rfc952
#
# RFC 1123 - Requirements for Internet Hosts - Application and Support
# http://tools.ietf.org/html/rfc1123
#
# If the hostname is determined to be invalid, the appropriate error will be
# displayed using the f_dialog_hnerror function above.
#
f_dialog_validate_hostname()
{
local fqhn="$1"
f_validate_hostname "$fqhn"
local retval=$?
# Produce an appropriate error message if necessary.
[ $retval -eq $SUCCESS ] || f_dialog_hnerror $retval "$fqhn"
return $retval
}
# f_dialog_input_hostname
#
# Edits the current hostname.
#
f_dialog_input_hostname()
{
local hostname="$( f_sysrc_get 'hostname:-$(hostname)' )"
local hostname_orig="$hostname" # for change-tracking
local msg
if [ "$USE_XDIALOG" ]; then
msg="$xmsg_please_enter_fqhn"
else
msg="$msg_please_enter_fqhn"
fi
#
# Loop until the user provides taint-free input.
#
while :; do
hostname=$( f_dialog_input "$msg" "$hostname" \
"$hline_alnum_punc_tab_enter"
) || return
# Taint-check the user's input
f_dialog_validate_hostname "$hostname" && break
done
#
# Save hostname only if the user changed the hostname.
#
if [ "$hostname" != "$hostname_orig" ]; then
f_dialog_info "$msg_saving_hostname"
f_sysrc_set hostname "$hostname"
fi
#
# Update resolv.conf(5) search/domain directives
#
f_dialog_resolv_conf_update "$hostname"
#
# Only ask to apply setting if the current hostname is different than
# the stored configuration (in rc.conf(5)).
#
if [ "$( hostname )" != "$( f_sysrc_get hostname )" ]; then
[ ! "$USE_XDIALOG" ] && f_dialog_clear
#
# If connected via ssh(1) and performing X11-Forwarding, don't
# allow the hostname to be changed to prevent the fatal error
# "X11 connection rejected because of wrong authentication."
#
if [ "$USE_XDIALOG" -a "$SSH_CONNECTION" ]; then
f_show_msg "$msg_activate_hostname_x11warning" \
"$( hostname )" "$hostname"
else
f_yesno "$msg_activate_hostname" \
"$( hostname )" "$hostname" \
&& hostname "$hostname"
fi
fi
return $SUCCESS
}
############################################################ MAIN
f_dprintf "%s: Successfully loaded." networking/hostname.subr
fi # ! $_NETWORKING_HOSTNAME_SUBR
|
