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