openwrt/package/base-files/default/etc/functions.sh

   1 #!/bin/ash
   2
   3 alias debug=${DEBUG:-:}
   4
   5 # allow env to override nvram
   6 nvram () {
   7   case $1 in
   8     get) eval "echo \${NVRAM_$2:-\$(command nvram get $2)}";;
   9     *) command nvram $*;;
  10   esac
  11 }
  12 . /etc/nvram.overrides
  13
  14 # valid interface?
  15 if_valid () (
  16   ifconfig "$1" >&- 2>&- ||
  17   [ "${1%%[0-9]}" = "br" ] ||
  18   {
  19     [ "${1%%[0-9]}" = "vlan" ] && (
  20       i=${1#vlan}
  21       hwname=$(nvram get vlan${i}hwname)
  22       hwaddr=$(nvram get ${hwname}macaddr)
  23       [ -z "$hwaddr" ] && return 1
  24
  25       vif=$(ifconfig -a | awk '/^eth.*'$hwaddr'/ {print $1; exit}' IGNORECASE=1)
  26       debug "# vlan$i => $vif"
  27
  28       $DEBUG ifconfig $vif up
  29       $DEBUG vconfig add $vif $i 2>&-
  30     )
  31   } ||
  32   { debug "# missing interface '$1' ignored"; false; }
  33 )
  34
  35 bitcount () {
  36   local c=$1
  37   echo $((
  38   c=((c>> 1)&0x55555555)+(c&0x55555555),
  39   c=((c>> 2)&0x33333333)+(c&0x33333333),
  40   c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
  41   c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
  42   c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
  43   ))
  44 }
  45
  46 valid_netmask () {
  47   return $((-($1)&~$1))
  48 }
  49
  50 ip2int () (
  51   set $(echo $1 | tr '\.' ' ')
  52   echo $(($1<<24|$2<<16|$3<<8|$4))
  53 )
  54
  55 int2ip () {
  56   echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
  57 }