package/dnsmasq/files/dnsmasq.init

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 START=60
   5
   6 dhcp_calc() {
   7         local ip="$1"
   8         local res=0
   9
  10         while [ -n "$ip" ]; do
  11                 part="${ip%%.*}"
  12                 res="$(($res * 256))"
  13                 res="$(($res + $part))"
  14                 [ "${ip%.*}" != "$ip" ] && ip="${ip#*.}" || ip=
  15         done
  16         echo "$res"
  17 }
  18
  19 dhcp_add() {
  20         local cfg="$1"
  21
  22         config_get net "$cfg" interface
  23         [ -n "$net" ] || return 0
  24
  25         config_get ifname "$net" ifname
  26         [ -n "$ifname" ] || return 0
  27
  28         config_get_bool ignore "$cfg" ignore
  29         [ "$ignore" -gt 0 ] && {
  30                 append args "-I $ifname"
  31                 return 0
  32         }
  33
  34         config_get proto "$net" proto
  35         [ static = "$proto" ] || return 0
  36
  37         config_get ipaddr "$net" ipaddr
  38         config_get netmask "$net" netmask
  39
  40         # check for an already active dhcp server on the interface, unless 'force' is set
  41         config_get_bool force "$cfg" force 0
  42         [ "$force" -gt 0 ] || {
  43                 udhcpc -n -q -R -s /bin/true -t 1 -i $ifname >&- && return 0
  44         }
  45
  46         config_get start "$cfg" start
  47         config_get limit "$cfg" limit
  48         config_get leasetime "$cfg" leasetime
  49         config_get options "$cfg" options
  50
  51         leasetime="${leasetime:-12h}"
  52         start="$(dhcp_calc "${start:-100}")"
  53         limit="$((${limit:-150} + 1))"
  54         eval "$(ipcalc.sh $ipaddr $netmask $start $limit)"
  55         append args "-F $START,$END,$NETMASK,$leasetime${options:+ $options}"
  56 }
  57
  58 start() {
  59         include /lib/network
  60         scan_interfaces
  61         config_load /var/state/network
  62         config_load dhcp
  63
  64         args=""
  65         config_foreach dhcp_add dhcp
  66
  67         dnsmasq $args && {
  68                 rm -f /tmp/resolv.conf
  69                 cat > /tmp/resolv.conf <<EOF
  70 nameserver 127.0.0.1
  71 search lan
  72 EOF
  73         }
  74 }
  75
  76 stop() {
  77         killall dnsmasq
  78 }