isc-dhcpd: Redux of convenience functions avoiding sed/cut
Also minimize messing with $IFS. Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This commit is contained in:
Philip Prindeville
parent
96e720bb6b
commit
7b998865ad
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@ -4,6 +4,7 @@ START=25
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USE_PROCD=1
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PROG=/usr/sbin/dhcpd
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WS=$'[\t ]'
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TTL=3600
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PREFIX="update add"
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@ -46,23 +47,35 @@ time2seconds() {
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echo $(( number * multiplier ))
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}
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trim() {
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local arg="$1"
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explode() {
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echo "${1//\./ }"
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}
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echo "$arg" | sed -e 's/^ *//' -e 's/ *$//'
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trim() {
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local str="$1" prev
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while true; do
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prev="$str"
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str="${str%%$WS}"
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[ "$str" = "$prev" ] && break
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done
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while true; do
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prev="$str"
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str="${str##$WS}"
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[ "$str" = "$prev" ] && break
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done
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echo "$str"
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}
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rfc1918_prefix() {
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local octets="$(echo "${1%%/*}" | cut -d. -f1)"
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local subnet="${1%/*}"
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set -- $(explode "$subnet")
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[ "$octets" = "10" ] && { echo "$octets"; return; }
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octets="$(echo "${1%%/*}" | cut -d. -f1-2)"
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case "$octets" in
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case "$1.$2" in
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10.*)
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echo "$1" ;;
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172.1[6789]|172.2[0-9]|172.3[01]|192.168)
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echo "$octets"
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;;
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echo "$1.$2" ;;
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esac
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}
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@ -110,12 +123,6 @@ update() {
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echo -e "$PREFIX" "$lhs $family $type $@\nsend" >> $dyn_file
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}
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explode() {
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local arg="$1"
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echo "$arg" | sed -e 's/\./, /g'
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}
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rev_str() {
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local str="$1" delim="$2"
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local frag result="" IFS="$delim"
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@ -138,20 +145,35 @@ create_empty_zone() {
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}
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append_routes() {
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local tuple tuple="$(trim "$1")"
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local network prefix router save octets compacted
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local tuple="$(trim "$1")"
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local network prefix router subnet compacted octet
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save="${tuple% *}"
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router="$(trim "${tuple#${save} }")"
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subnet="${tuple%%$WS*}"
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network="$(trim "${save%/[0-9]*}")"
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network="${subnet%/[0-9]*}"
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prefix="$(trim "${save##${network}/}")"
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prefix="${subnet#*/}"
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octets=$((($prefix + 7) / 8))
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compacted="$(echo "$network" | cut -d. -f1-$octets)"
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set -- $(explode "$network")
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append routes "$(explode "$prefix${compacted:+.$compacted}.$router")" ", "
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case $((($prefix + 7) / 8)) in
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0)
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compacted= ;;
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1)
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compacted="$1" ;;
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2)
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compacted="$1 $2" ;;
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3)
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compacted="$1 $2 $3" ;;
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4)
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compacted="$1 $2 $3 $4" ;;
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esac
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router="${tuple#${subnet}$WS}"
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for octet in $prefix $compacted $(explode "$router"); do
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append routes "$octet" ", "
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done
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}
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append_dhcp_options() {
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@ -280,7 +302,7 @@ static_host_add() {
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config_get leasetime "$cfg" "leasetime"
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if [ -n "$leasetime" ] ; then
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leasetime="$(time2seconds "$leasetime")"
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[ "$?" -ne 0 ] && return 1
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[ $? -ne 0 ] && return 1
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fi
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config_get hostid "$cfg" "hostid"
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@ -290,8 +312,7 @@ static_host_add() {
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config_get force_send "$cfg" "force_send"
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extra_options=
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local _IFS="$IFS" IFS=','
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for option in $force_send; do
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for option in ${force_send//,/ }; do
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case "$option" in
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hostname)
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append extra_options "0c" "," ;;
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@ -309,7 +330,6 @@ static_host_add() {
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echo "unknown option: $option" >&2 ;;
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esac
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done
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IFS="$_IFS"
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macn=0
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for mac in $macs; do
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@ -325,7 +345,7 @@ static_host_add() {
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echo " hardware ethernet $mac;"
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echo " fixed-address $ip;"
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echo " option host-name \"$name\";"
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if [ "$broadcast" -eq 1 ] ; then
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if [ $broadcast -eq 1 ] ; then
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echo " always-broadcast true;"
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fi
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if [ -n "$leasetime" ] ; then
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@ -379,8 +399,8 @@ gen_dhcp_subnet() {
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if [ -n "$BROADCAST" ] && [ "$BROADCAST" != "0.0.0.0" ] ; then
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echo " option broadcast-address $BROADCAST;"
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fi
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if [ "$dynamicdhcp" -eq 0 ] ; then
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if [ "$authoritative" -eq 1 ] ; then
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if [ $dynamicdhcp -eq 0 ] ; then
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if [ $authoritative -eq 1 ] ; then
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echo " deny unknown-clients;"
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else
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echo " ignore unknown-clients;"
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@ -390,7 +410,7 @@ gen_dhcp_subnet() {
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echo " default-lease-time $leasetime;"
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echo " max-lease-time $leasetime;"
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fi
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if [ "$defaultroute" -eq 1 ] ; then
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if [ $defaultroute -eq 1 ] ; then
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echo " option routers $gateway;"
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fi
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echo " option domain-name-servers $DNS;"
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@ -413,7 +433,7 @@ dhcpd_add() {
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local IP NETMASK BROADCAST NETWORK PREFIX DNS START END
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config_get_bool ignore "$cfg" "ignore" 0
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[ "$ignore" = "0" ] || return 0
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[ $ignore -eq 1 ] && return 0
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config_get net "$cfg" "interface"
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[ -n "$net" ] || return 0
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@ -431,19 +451,19 @@ dhcpd_add() {
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network_get_device ifname "$net" || return 0
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network_get_protocol proto "$net" || return 0
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[ static = "$proto" ] || return 0
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[ "$proto" != "static" ] && return 0
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local octets="$(rfc1918_prefix "$subnet")"
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[ -n "$octets" ] && append rfc1918_nets "$octets"
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[ $synthesize -eq 0 ] && return
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[ $synthesize -eq 0 ] && return 0
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config_get_bool dynamicdhcp "$cfg" "dynamicdhcp" 1
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config_get_bool defaultroute "$cfg" "default_route" 1
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dhcp_ifs="$dhcp_ifs $ifname"
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append dhcp_ifs "$ifname"
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if ! ipcalc "$subnet" "$start" "$limit"; then
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echo "invalid range params: $subnet start: $start limit $limit" >&2
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@ -454,7 +474,7 @@ dhcpd_add() {
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config_get leasetime "$cfg" "leasetime"
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if [ -n "$leasetime" ] ; then
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leasetime="$(time2seconds "$leasetime")"
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[ "$?" -ne 0 ] && return 1
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[ $? -ne 0 ] && return 1
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fi
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if network_get_dnsserver dnsserver "$net" ; then
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@ -493,9 +513,9 @@ general_config() {
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[ $boot_unknown_clients -eq 0 ] && echo "boot-unknown-clients false;"
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default_lease_time="$(time2seconds "$default_lease_time")"
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[ "$?" -ne 0 ] && return 1
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[ $? -ne 0 ] && return 1
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max_lease_time="$(time2seconds "$max_lease_time")"
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[ "$?" -ne 0 ] && return 1
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[ $? -ne 0 ] && return 1
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if [ $dynamicdns -eq 1 ]; then
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create_empty_zone "$domain"
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@ -620,6 +640,7 @@ start_service() {
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local rfc1918_nets=""
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# alas we have to make 2 passes...
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dhcp_ifs=
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config_foreach dhcpd_add dhcp 0
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rfc1918_nets="$(echo "$rfc1918_nets" | tr ' ' $'\n' | sort | uniq | tr $'\n' ' ')"
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@ -637,6 +658,7 @@ EOF
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rfc1918_nets=
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dhcp_ifs=
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config_foreach dhcpd_add dhcp 1 >> $config_file
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static_hosts >> $config_file
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