openwrt/package/dnsmasq/files/dnsmasq.init

   1 #!/bin/sh
   2 . /etc/functions.sh
   3 include network
   4 scan_interfaces
   5
   6 # The following is to automatically configure the DHCP settings
   7 # based on config settings. Feel free to replace all this crap
   8 # with a simple "dnsmasq" and manage everything via the
   9 # /etc/dnsmasq.conf config file
  10
  11 [ -f /etc/dnsmasq.conf ] || exit
  12
  13 args=""
  14 iface=lan
  15 config_get ifname "$iface" ifname
  16
  17 dhcp_enable="${dhcp_enable:-1}"
  18 dhcp_start="${dhcp_start:-100}"
  19 dhcp_num="${dhcp_num:-50}"
  20 dhcp_lease="${dhcp_lease:-12h}"
  21
  22 # if dhcp_enable is unset and there is a dhcp server on the network already, default to dhcp_enable=0
  23 [ -z "$dhcp_enable" ] && udhcpc -n -q -R -s /bin/true -i $ifname >&- && dhcp_enable="${dhcp_enable:-0}"
  24
  25 # dhcp_enable=0 disables the dhcp server
  26 (
  27         [ -z "$dhcp_enable" -o "$dhcp_enable" -eq 1 ] && {
  28                 # no existing DHCP server?
  29
  30                 # calculate settings
  31                 config_get ipaddr "$iface" ipaddr
  32                 config_get netmask "$iface" netmask
  33                 eval $(ipcalc $ipaddr $netmask ${dhcp_start:-100} ${dhcp_num:-150})
  34
  35                 # and pass the args via config parser defines
  36                 echo "@define dhcp_enable 1"
  37                 echo "@define netmask $NETMASK"
  38                 echo "@define start $START"
  39                 echo "@define end $END"
  40                 echo "@define lease ${dhcp_lease:-12h}"
  41         }
  42
  43         # ignore requests from wan interface
  44         config_get wan_proto wan proto
  45         config_get wan_ifname wan ifname
  46         [ -z "$wan_proto" -o "$wan_proto" = "none" ] || echo "@define wan_ifname $wan_ifname"
  47
  48         cat /etc/dnsmasq.conf
  49 ) | awk -f /usr/lib/parse-config.awk | dnsmasq -C /proc/self/fd/0