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

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