openwrt/package/dnsmasq/files/dnsmasq.init

   1 #!/bin/sh
   2 . /etc/config/network
   3
   4 # The following is to automatically configure the DHCP settings
   5 # based on config settings. Feel free to replace all this crap
   6 # with a simple "dnsmasq" and manage everything via the
   7 # /etc/dnsmasq.conf config file
   8
   9 [ -f /etc/dnsmasq.conf ] || exit
  10
  11 args=""
  12 iface=lan
  13 eval "ifname=\${${iface}_ifname}"
  14
  15 dhcp_enable="${dhcp_enable:-1}"
  16 dhcp_start="${dhcp_start:-100}"
  17 dhcp_num="${dhcp_num:-50}"
  18 dhcp_lease="${dhcp_lease:-12h}"
  19
  20 # if dhcp_enable is unset and there is a dhcp server on the network already, default to dhcp_enable=0
  21 [ -z "$dhcp_enable" ] && udhcpc -n -q -R -s /bin/true -i $ifname >&- && dhcp_enable="${dhcp_enable:-0}"
  22
  23 # dhcp_enable=0 disables the dhcp server
  24 (
  25         [ -z "$dhcp_enable" -o "$dhcp_enable" -eq 1 ] && {
  26                 # no existing DHCP server?
  27
  28                 # calculate settings
  29                 eval "ipaddr=\${${iface}_ipaddr}"
  30                 eval "netmask=\${${iface}_netmask}"
  31                 eval $(ipcalc $ipaddr $netmask ${dhcp_start:-100} ${dhcp_num:-150})
  32
  33                 # and pass the args via config parser defines
  34                 echo "@define dhcp_enable 1"
  35                 echo "@define netmask $NETMASK"
  36                 echo "@define start $START"
  37                 echo "@define end $END"
  38                 echo "@define lease ${dhcp_lease:-12h}"
  39         }
  40
  41         # ignore requests from wan interface
  42         [ -z "$wan_proto" -o "$wan_proto" = "none" ] || echo "@define wan_ifname $wan_ifname"
  43
  44         cat /etc/dnsmasq.conf
  45 ) | awk -f /usr/lib/parse-config.awk | dnsmasq -C /proc/self/fd/0