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   if [ -x /usr/sbin/nvram ]; then
   8     case $1 in
   9       get) eval "echo \${$2:-\$(command nvram get $2)}";;
  10       *) command nvram $*;;
  11     esac
  12   else
  13     case $1 in
  14       get) eval "echo \${$2:-\${DEFAULT_$2}}";;
  15       *);;
  16     esac
  17   fi
  18 }
  19
  20 # valid interface?
  21 if_valid () (
  22   ifconfig "$1" >&- 2>&- ||
  23   [ "${1%%[0-9]}" = "br" ] ||
  24   {
  25     [ "${1%%[0-9]}" = "vlan" ] && (
  26       i=${1#vlan}
  27       hwname=$(nvram get vlan${i}hwname)
  28       hwaddr=$(nvram get ${hwname}macaddr)
  29       [ -z "$hwaddr" ] && return 1
  30
  31       vif=$(ifconfig -a | awk '/^eth.*'$hwaddr'/ {print $1; exit}' IGNORECASE=1)
  32       debug "# vlan$i => $vif"
  33
  34       $DEBUG ifconfig $vif up
  35       $DEBUG vconfig add $vif $i 2>&-
  36     )
  37   } ||
  38   { debug "# missing interface '$1' ignored"; false; }
  39 )
  40
  41 bitcount () {
  42   local c=$1
  43   echo $((
  44   c=((c>> 1)&0x55555555)+(c&0x55555555),
  45   c=((c>> 2)&0x33333333)+(c&0x33333333),
  46   c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
  47   c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
  48   c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
  49   ))
  50 }
  51
  52 valid_netmask () {
  53   return $((-($1)&~$1))
  54 }
  55
  56 ip2int () (
  57   set $(echo $1 | tr '\.' ' ')
  58   echo $(($1<<24|$2<<16|$3<<8|$4))
  59 )
  60
  61 int2ip () {
  62   echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
  63 }