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#!/bin/sh /etc/rc.common
START=19
USE_PROCD=1
PROG=/usr/sbin/dhcpd
lease_file=/tmp/dhcpd.leases
config_file=/tmp/run/dhcpd.conf
time2seconds() {
local timestring=$1
local multiplier number suffix
suffix="${timestring//[0-9 ]}"
number="${timestring%%$suffix}"
[ "$number$suffix" != "$timestring" ] && return 1
case "$suffix" in
"" | s)
multiplier=1
;;
m)
multiplier=60
;;
h)
multiplier=3600
;;
d)
multiplier=86400
;;
w)
multiplier=604800
;;
*)
return 1
;;
esac
echo $(( number * multiplier ))
}
# duplicated from dnsmasq init script
hex_to_hostid() {
local var="$1"
local hex="${2#0x}" # strip optional "0x" prefix
if [ -n "${hex//[0-9a-fA-F]/}" ]; then
# is invalid hex literal
return 1
fi
# convert into host id
export "$var=$(
printf "%0x:%0x" \
$(((0x$hex >> 16) % 65536)) \
$(( 0x$hex % 65536))
)"
return 0
}
typeof() {
echo "$1" | awk '
/^\d+\.\d+\.\d+\.\d+$/ { print "ip\n"; next; }
/^(true|false)$/ { print "bool\n"; next; }
/^\d+$/ { print "integer\n"; next; }
/^"[^"]*"$/ { print "string\n"; next; }
{ print "other\n"; next; }
'
}
explode() {
local arg="$1"
echo "$arg" | sed -e 's/\./, /g'
}
append_routes() {
local tuple tuples="$1"
local string=
local IFS=','
for tuple in $tuples; do
local network prefix router save octets compacted
save="${tuple% *}"
router="${tuple#${save} }"
network="${save%/[0-9]*}"
prefix="${save##${network}}"
prefix="${prefix:1}"
octets=$((($prefix + 7) / 8))
compacted="$(echo "$network" | cut -d. -f1-$octets)"
string="${string:+, }$(explode "$prefix.$compacted.$router")"
done
echo " option classless-ipv4-route $string;"
}
append_dhcp_options() {
local tuple="$1"
# strip redundant "option:" prefix
tuple="${tuple#option:}"
local tag="${tuple%%,*}"
local values="${tuple#$tag,}"
local formatted value
local IFS=$', \n'
for value in $values; do
# detect type of $value and quote if necessary
case $(typeof "$value") in
ip|bool|integer|string)
;;
other)
value="\"$value\""
;;
esac
formatted="$formatted${formatted:+, }$value"
done
echo " option $tag $formatted;"
}
static_host_add() {
local cfg="$1"
local broadcast hostid macn macs mac name ip leasetime
config_get macs "$cfg" "mac"
[ -n "$macs" ] || return 0
config_get name "$cfg" "name"
[ -n "$name" ] || return 0
config_get ip "$cfg" "ip"
[ -n "$ip" ] || return 0
config_get_bool broadcast "$cfg" "broadcast" 0
config_get dns "$cfg" "dns"
config_get gateway "$cfg" "gateway"
config_get leasetime "$cfg" "leasetime"
if [ -n "$leasetime" ] ; then
leasetime="$(time2seconds "$leasetime")"
[ "$?" -ne 0 ] && return 1
fi
config_get hostid "$cfg" "hostid"
if [ -n "$hostid" ] ; then
hex_to_hostid hostid "$hostid" || return 1
fi
macn=0
for mac in $macs; do
macn=$(( macn + 1 ))
done
for mac in $macs; do
local secname="$name"
if [ $macn -gt 1 ] ; then
secname="${name}-${mac//:}"
fi
echo "host $secname {"
echo " hardware ethernet $mac;"
echo " fixed-address $ip;"
echo " option host-name \"$name\";"
if [ "$broadcast" -eq 1 ] ; then
echo " always-broadcast true;"
fi
if [ -n "$leasetime" ] ; then
echo " default-lease-time $leasetime;"
echo " max-lease-time $leasetime;"
fi
if [ -n "$hostid" ] ; then
echo " option dhcp-client-identifier $hostid;"
fi
if [ -n "$dns" ] ; then
echo " option domain-name-servers $dns;"
fi
if [ -n "$gateway" ] ; then
echo " option routers $gateway;"
fi
config_list_foreach "$cfg" "routes" append_routes
config_list_foreach "$cfg" "dhcp_option" append_dhcp_options
echo "}"
done
}
static_hosts() {
config_foreach static_host_add host "$@"
}
gen_dhcp_subnet() {
local cfg="$1"
echo "subnet $NETWORK netmask $NETMASK {"
echo " range $START $END;"
echo " option subnet-mask $netmask;"
if [ "$BROADCAST" != "0.0.0.0" ] ; then
echo " option broadcast-address $BROADCAST;"
fi
if [ "$dynamicdhcp" -eq 0 ] ; then
if [ "$authoritative" -eq 1 ] ; then
echo " deny unknown-clients;"
else
echo " ignore unknown-clients;"
fi
fi
if [ -n "$leasetime" ] ; then
echo " default-lease-time $leasetime;"
echo " max-lease-time $leasetime;"
fi
echo " option routers $gateway;"
echo " option domain-name-servers $DNS;"
config_list_foreach "$cfg" "routes" append_routes
config_list_foreach "$cfg" "dhcp_option" append_dhcp_options
echo "}"
}
dhcpd_add() {
local cfg="$1"
local dhcp6range="::"
local dynamicdhcp end gateway ifname ignore leasetime limit net netmask
local proto networkid start subnet
local IP NETMASK BROADCAST NETWORK PREFIX DNS START END
config_get_bool ignore "$cfg" "ignore" 0
[ "$ignore" = "0" ] || return 0
config_get net "$cfg" "interface"
[ -n "$net" ] || return 0
config_get start "$cfg" "start"
[ -n "$start" ] || return 0
config_get limit "$cfg" "limit"
[ -n "$limit" ] || return 0
network_get_subnet subnet "$net" || return 0
network_get_device ifname "$net" || return 0
network_get_protocol proto "$net" || return 0
[ static = "$proto" ] || return 0
config_get_bool dynamicdhcp "$cfg" "dynamicdhcp" 1
dhcp_ifs="$dhcp_ifs $ifname"
eval "$(ipcalc.sh $subnet $start $limit)"
config_get netmask "$cfg" "netmask" "$NETMASK"
config_get leasetime "$cfg" "leasetime"
if [ -n "$leasetime" ] ; then
leasetime="$(time2seconds "$leasetime")"
[ "$?" -ne 0 ] && return 1
fi
if network_get_dnsserver dnsserver "$net" ; then
for dnsserv in $dnsserver ; do
DNS="$DNS${DNS:+, }$dnsserv"
done
else
DNS="$IP"
fi
if ! network_get_gateway gateway "$net" ; then
gateway="$IP"
fi
gen_dhcp_subnet "$cfg" >> $config_file
}
general_config() {
local always_broadcast boot_unknown_clients log_facility
local default_lease_time max_lease_time
config_get_bool always_broadcast "isc_dhcpd" "always_broadcast" 0
config_get_bool authoritative "isc_dhcpd" "authoritative" 1
config_get_bool boot_unknown_clients "isc_dhcpd" "boot_unknown_clients" 1
config_get default_lease_time "isc_dhcpd" "default_lease_time" 3600
config_get max_lease_time "isc_dhcpd" "max_lease_time" 86400
config_get log_facility "isc_dhcpd" "log_facility"
config_get domain "isc_dhcpd" "domain"
[ $always_broadcast -eq 1 ] && echo "always-broadcast true;"
[ $authoritative -eq 1 ] && echo "authoritative;"
[ $boot_unknown_clients -eq 0 ] && echo "boot-unknown-clients false;"
default_lease_time="$(time2seconds "$default_lease_time")"
[ "$?" -ne 0 ] && return 1
max_lease_time="$(time2seconds "$max_lease_time")"
[ "$?" -ne 0 ] && return 1
if [ -n "$log_facility" ] ; then
echo "log-facility $log_facility;"
fi
echo "default-lease-time $default_lease_time;"
echo "max-lease-time $max_lease_time;"
[ -n "$domain" ] && echo "option domain-name \"$domain\";"
echo -e "\n# additional codes\noption classless-ipv4-route code 121 = array of { unsigned integer 8 };\n"
rm -f /tmp/resolv.conf
echo "# This file is generated by the DHCPD service" > /tmp/resolv.conf
[ -n "$domain" ] && echo "domain $domain" >> /tmp/resolv.conf
echo "nameserver 127.0.0.1" >> /tmp/resolv.conf
}
# base procd hooks
boot() {
DHCPD_BOOT=1
start "$@"
}
start_service() {
local domain dhcp_ifs authoritative
if [ -n "$DHCPD_BOOT" ] ; then
return 0
fi
if [ ! -e $lease_file ] ; then
touch $lease_file
fi
if [ -e "/etc/dhcpd.conf" ] ; then
config_file="/etc/dhcpd.conf"
else
. /lib/functions/network.sh
config_load dhcp
general_config > $config_file
config_foreach dhcpd_add dhcp
static_hosts >> $config_file
[ -z "$dhcp_ifs" ] && return 0
fi
procd_open_instance
procd_set_param command $PROG -q -f -cf $config_file -lf $lease_file $dhcp_ifs
procd_close_instance
}
reload_service() {
rc_procd start_service "$@"
prodcd_send_signal dhcpd "$@"
}
add_interface_trigger() {
local cfg=$1
local trigger ignore
config_get trigger "$cfg" interface
config_get_bool ignore "$cfg" ignore 0
if [ -n "$trigger" -a $ignore -eq 0 ] ; then
procd_add_reload_interface_trigger "$trigger"
fi
}
service_triggers() {
if [ -n "$DHCPD_BOOT" ] ; then
# Make the first start robust to slow interfaces; wait a while
procd_add_raw_trigger "interface.*.up" 5000 /etc/init.d/dhcpd restart
else
# reload with normal parameters
procd_add_reload_trigger "network" "dhcp"
config_load dhcp
config_foreach add_interface_trigger dhcp
fi
}