openwrt/package/dnsmasq/files/S50dnsmasq

   1 #!/bin/sh
   2
   3 # The following is to automatically configure the DHCP settings
   4 # based on nvram settings. Feel free to replace all this crap
   5 # with a simple "dnsmasq" and manage everything via the
   6 # /etc/dnsmasq.conf config file
   7
   8 # DHCP interface (lan, wan, wifi -- any ifup *)
   9 iface=lan
  10 ifname=$(nvram get ${iface}_ifname)
  11
  12 udhcpc -n -q -R -s /bin/true -i $ifname >&- || {
  13   # no existing DHCP server?
  14
  15   # calculate settings
  16    ipaddr=$(nvram get ${iface}_ipaddr)
  17   netmask=$(nvram get ${iface}_netmask)
  18     start=$(nvram get dhcp_start)
  19       num=$(nvram get dhcp_num)
  20
  21   eval $(ipcalc $ipaddr $netmask ${start:-100} ${num:-150})
  22   lease=$(nvram get dhcp_lease)
  23
  24   # and pass the args via the commandline
  25   # (because trying to edit the config from here is crazy)
  26   args="-K -F $START,$END,$NETMASK,${lease:-12h}"
  27 }
  28
  29 # ignore requests from wan interface
  30 wanproto=$(nvram get wan_proto)
  31 [ -z "$wanproto" -o "$wanproto" = "none" ] || args="${args} -I $(nvram get wan_ifname)"
  32
  33 dnsmasq ${args} && {
  34         # use dnsmasq for local dns requests
  35         rm -f /tmp/resolv.conf
  36         cat > /tmp/resolv.conf <<EOF
  37 nameserver 127.0.0.1
  38 search lan
  39 EOF
  40 }