Current File : //usr/share/bsdconfig/networking/resolv.subr
if [ ! "$_NETWORKING_RESOLV_SUBR" ]; then _NETWORKING_RESOLV_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.
#
# $FreeBSD$
#
############################################################ INCLUDES
BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_dprintf "%s: loading includes..." networking/resolv.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/media/tcpip.subr
f_include $BSDCFG_SHARE/networking/common.subr
f_include $BSDCFG_SHARE/networking/ipaddr.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
############################################################ CONFIGURATION
#
# When updating resolv.conf(5), should we populate the `search' directive with
# all possible sub-domains? In example, if the domain is "sub.domain.com", when
# the below option is set to 1, include both "sub.domain.com" and "domain.com"
# in the `search' directive, otherwise use only "sub.domain.com".
#
# When enabled (set to 1), specify the minimum number of dots required for each
# `search' domain by setting the second option below, `RESOLVER_SEARCH_NDOTS'.
#
: ${RESOLVER_SEARCH_DOMAINS_ALL:=1}
: ${RESOLVER_SEARCH_NDOTS:=1}
############################################################ FUNCTIONS
# f_resolv_conf_domain
#
# Returns the domain configured in resolv.conf(5).
#
f_resolv_conf_domain()
{
tail -r "$RESOLV_CONF" 2> /dev/null | awk \
'
BEGIN { found = 0 }
( tolower($1) == "domain" ) \
{
print $2
found = 1
exit
}
END { exit ! found }
'
}
# f_resolv_conf_search
#
# Returns the search configured in resolv.conf(5).
#
f_resolv_conf_search()
{
tail -r "$RESOLV_CONF" 2> /dev/null | awk \
'
BEGIN { found = 0 }
{
tl0 = tolower($0)
if ( match(tl0, /^[[:space:]]*search[[:space:]]+/) ) {
search = substr($0, RLENGTH + 1)
sub(/[[:space:]]*#.*$/, "", search)
gsub(/[[:space:]]+/, " ", search)
print search
found = 1
exit
}
}
END { exit ! found }
'
}
# f_dialog_resolv_conf_update $hostname
#
# Updates the search/domain directives in resolv.conf(5) given a valid fully-
# qualified hostname.
#
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_dialog_resolv_conf_update_awk='
# Variables that should be defined on the invocation line:
# -v domain="domain"
# -v search_all="0|1"
# -v search_ndots="1+"
#
BEGIN {
domain_found = search_found = 0
if ( search_all ) {
search = ""
subdomain = domain
if ( search_ndots < 1 )
search_ndots = 1
ndots = split(subdomain, labels, ".") - 1
while ( ndots-- >= search_ndots ) {
if ( length(search) ) search = search " "
search = search subdomain
sub(/[^.]*\./, "", subdomain)
}
}
else search = domain
}
{
if ( domain_found && search_found ) { print; next }
tl0 = tolower($0)
if ( ! domain_found && \
match(tl0, /^[[:space:]]*domain[[:space:]]+/) ) \
{
if ( length(domain) ) {
printf "%s%s\n", substr($0, 0, RLENGTH), domain
domain_found = 1
}
}
else if ( ! search_found && \
match(tl0, /^[[:space:]]*search[[:space:]]+/) ) \
{
if ( length(search) ) {
printf "%s%s\n", substr($0, 0, RLENGTH), search
search_found = 1
}
}
else print
}
END {
if ( ! search_found && length(search) )
printf "search\t%s\n", search
if ( ! domain_found && length(domain) )
printf "domain\t%s\n", domain
}
'
f_dialog_resolv_conf_update()
{
local funcname=f_dialog_resolv_conf_update
local hostname="$1"
#
# Extrapolate the desired domain search parameter for resolv.conf(5)
#
local search nfields ndots domain="${hostname#*.}"
if [ "$RESOLVER_SEARCH_DOMAINS_ALL" = "1" ]; then
search=
IFS=. f_count_ifs nfields "$domain"
ndots=$(( $nfields - 1 ))
while [ $ndots -ge ${RESOLVER_SEARCH_NDOTS:-1} ]; do
search="$search $domain"
domain="${domain#*.}"
ndots=$(( $ndots - 1 ))
done
search="${search# }"
domain="${hostname#*.}"
else
search="$domain"
fi
#
# Save domain/search information only if different from resolv.conf(5)
#
if [ "$domain" != "$( f_resolv_conf_domain )" -o \
"$search" != "$( f_resolv_conf_search )" ]
then
f_dialog_info "Saving new domain/search settings" \
"to resolv.conf(5)..."
#
# Create a new temporary file to write our resolv.conf(5)
# update with our new `domain' and `search' directives.
#
local tmpfile
f_eval_catch -dk tmpfile $funcname mktemp \
'mktemp -t "%s"' "$tmpfile" || return $DIALOG_CANCEL
#
# Fixup permissions and ownership (mktemp(1) creates the
# temporary file with 0600 permissions -- change the
# permissions and ownership to match resolv.conf(5) before
# we write it out and mv(1) it into place).
#
local mode owner
f_eval_catch -dk mode $funcname stat \
'stat -f "%%#Lp" "%s"' "$RESOLV_CONF" || mode=0644
f_eval_catch -dk owner $funcname stat \
'stat -f "%%u:%%g" "%s"' "$RESOLV_CONF" ||
owner="root:wheel"
f_eval_catch -d $funcname chmod \
'chmod "%s" "%s"' "$mode" "$tmpfile"
f_eval_catch -d $funcname chown \
'chown "%s" "%s"' "$owner" "$tmpfile"
#
# Operate on resolv.conf(5), replacing only the last
# occurrences of `domain' and `search' directives (or add
# them to the top if not found), in strict-adherence to the
# following entry in resolver(5):
#
# The domain and search keywords are mutually exclusive.
# If more than one instance of these keywords is present,
# the last instance will override.
#
# NOTE: If RESOLVER_SEARCH_DOMAINS_ALL is set to `1' in the
# environment, all sub-domains will be added to the `search'
# directive, not just the FQDN.
#
local domain="${hostname#*.}" new_contents
[ "$domain" = "$hostname" ] && domain=
new_contents=$( tail -r "$RESOLV_CONF" 2> /dev/null )
new_contents=$( echo "$new_contents" | awk \
-v domain="$domain" \
-v search_all="${RESOLVER_SEARCH_DOMAINS_ALL:-1}" \
-v search_ndots="${RESOLVER_SEARCH_NDOTS:-1}" \
"$f_dialog_resolv_conf_update_awk" )
#
# Write the temporary file contents and move the temporary
# file into place.
#
echo "$new_contents" | tail -r > "$tmpfile" ||
return $DIALOG_CANCEL
f_eval_catch -d $funcname mv \
'mv "%s" "%s"' "$tmpfile" "$RESOLV_CONF"
fi
}
# f_dialog_input_nameserver [ $n $nameserver ]
#
# Allows the user to edit a given nameserver. The first argument is the
# resolv.conf(5) nameserver ``instance'' integer. For example, this will be one
# if editing the first nameserver instance, two if editing the second, three if
# the third, ad nauseum. If this argument is zero, null, or missing, the value
# entered by the user (if non-null) will be added to resolv.conf(5) as a new
# `nameserver' entry. The second argument is the IPv4 address of the nameserver
# to be edited -- this will be displayed as the initial value during the edit.
#
# Taint-checking is performed when editing an existing entry (when the second
# argument is one or higher) in that the first argument must match the current
# value of the Nth `nameserver' instance in resolv.conf(5) else an error is
# generated discarding any/all changes.
#
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_dialog_input_nameserver_edit_awk='
# Variables that should be defined on the invocation line:
# -v nsindex="1+"
# -v old_value="..."
# -v new_value="..."
#
BEGIN {
if ( nsindex < 1 ) exit 1
found = n = 0
}
{
if ( found ) { print; next }
if ( match(tolower($0), /^[[:space:]]*nameserver[[:space:]]+/)) {
if ( ++n == nsindex ) {
if ( $2 != old_value ) exit 2
if ( new_value != "" ) printf "%s%s\n", \
substr($0, 0, RLENGTH), new_value
found = 1
}
else print
}
else print
}
END { if ( ! found ) exit 3 }
'
f_dialog_input_nameserver()
{
local funcname=f_dialog_input_nameserver
local index="${1:-0}" old_ns="$2" new_ns
local ns="$old_ns"
#
# Perform sanity checks
#
f_isinteger "$index" || return $DIALOG_CANCEL
[ $index -ge 0 ] || return $DIALOG_CANCEL
local msg
if [ $index -gt 0 ]; then
if [ "$USE_XDIALOG" ]; then
msg="$xmsg_please_enter_nameserver_existing"
else
msg="$msg_please_enter_nameserver_existing"
fi
else
msg="$msg_please_enter_nameserver"
fi
#
# Loop until the user provides taint-free input.
#
while :; do
f_dialog_input new_ns "$msg" "$ns" \
"$hline_num_punc_tab_enter" || return $?
# Take only the first "word" of the user's input
new_ns="${new_ns%%[$IFS]*}"
# Taint-check the user's input
[ "$new_ns" ] || break
f_dialog_validate_ipaddr "$new_ns" && break
# Update prompt to allow user to re-edit previous entry
ns="$new_ns"
done
#
# Save only if the user changed the nameserver.
#
if [ $index -eq "0" -a "$new_ns" ]; then
f_dialog_info "$msg_saving_nameserver"
printf "nameserver\t%s\n" "$new_ns" >> "$RESOLV_CONF"
return $DIALOG_OK
elif [ $index -gt 0 -a "$old_ns" != "$new_ns" ]; then
if [ "$new_ns" ]; then
msg="$msg_saving_nameserver_existing"
else
msg="$msg_removing_nameserver"
fi
f_dialog_info "$msg"
#
# Create a new temporary file to write our new resolv.conf(5)
#
local tmpfile
f_eval_catch -dk tmpfile $funcname mktemp \
'mktemp -t "%s"' "$pgm" || return $DIALOG_CANCEL
#
# Quietly fixup permissions and ownership
#
local mode owner
f_eval_catch -dk mode $funcname stat \
'stat -f "%%#Lp" "%s"' "$RESOLV_CONF" || mode=0644
f_eval_catch -dk owner $funcname stat \
'stat -f "%%u:%%g" "%s"' "$RESOLV_CONF" ||
owner="root:wheel"
f_eval_catch -d $funcname chmod \
'chmod "%s" "%s"' "$mode" "$tmpfile"
f_eval_catch -d $funcname chown \
'chown "%s" "%s"' "$owner" "$tmpfile"
#
# Operate on resolv.conf(5)
#
local new_contents
new_contents=$( awk -v nsindex="$index" \
-v old_value="$old_ns" \
-v new_value="$new_ns" \
"$f_dialog_input_nameserver_edit_awk" \
"$RESOLV_CONF" )
#
# Produce an appropriate error message if necessary.
#
local retval=$?
case $retval in
1) f_die 1 "$msg_internal_error_nsindex_value" "$nsindex" ;;
2) f_show_msg "$msg_resolv_conf_changed_while_editing"
return $retval ;;
3) f_show_msg "$msg_resolv_conf_entry_no_longer_exists"
return $retval ;;
esac
#
# Write the temporary file contents and move the temporary
# file into place.
#
echo "$new_contents" > "$tmpfile" || return $DIALOG_CANCEL
f_eval_catch -d $funcname mv \
'mv "%s" "%s"' "$tmpfile" "$RESOLV_CONF"
fi
}
# f_dialog_menu_nameservers
#
# Edit the nameservers in resolv.conf(5).
#
f_dialog_menu_nameservers()
{
local prompt="$msg_dns_configuration"
local menu_list # Calculated below
local hline="$hline_arrows_tab_enter"
local defaultitem=
local height width rows
local opt_exit="$msg_return_to_previous_menu"
local opt_add="$msg_add_nameserver"
#
# Loop forever until the user has finished configuring nameservers
#
while :; do
#
# Re/Build list of nameservers
#
local nameservers
f_resolv_conf_nameservers nameservers
menu_list=$(
index=1
echo "'X $msg_exit' '$opt_exit'"
index=$(( $index + 1 ))
echo "'A $msg_add' '$opt_add'"
index=$(( $index + 1 ))
for ns in $nameservers; do
[ $index -lt ${#DIALOG_MENU_TAGS} ] || break
f_substr -v tag "$DIALOG_MENU_TAGS" $index 1
echo "'$tag nameserver' '$ns'"
index=$(( $index + 1 ))
done
)
#
# Display configuration-edit menu
#
eval f_dialog_menu_size height width rows \
\"\$DIALOG_TITLE\" \
\"\$DIALOG_BACKTITLE\" \
\"\$prompt\" \
\"\$hline\" \
$menu_list
local tag
tag=$( eval $DIALOG \
--title \"\$DIALOG_TITLE\" \
--backtitle \"\$DIALOG_BACKTITLE\" \
--hline \"\$hline\" \
--ok-label \"\$msg_ok\" \
--cancel-label \"\$msg_cancel\" \
--default-item \"\$defaultitem\" \
--menu \"\$prompt\" \
$height $width $rows \
$menu_list \
2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
)
local retval=$?
f_dialog_data_sanitize tag
# Return if "Cancel" was chosen (-1) or ESC was pressed (255)
if [ $retval -ne $DIALOG_OK ]; then
return $retval
else
# Only update default-item on success
defaultitem="$tag"
fi
case "$tag" in
"X $msg_exit") break ;;
"A $msg_add")
f_dialog_input_nameserver
;;
*)
local n ns
n=$( eval f_dialog_menutag2index \"\$tag\" $menu_list )
ns=$( eval f_dialog_menutag2item \"\$tag\" $menu_list )
f_dialog_input_nameserver $(( $n - 2 )) "$ns"
;;
esac
done
}
############################################################ MAIN
f_dprintf "%s: Successfully loaded." networking/resolv.subr
fi # ! $_NETWORKING_RESOLV_SUBR
Mini Shell