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#!/bin/ash
alias debug=${DEBUG:-:}
# allow env to override nvram
nvram () {
if [ -x /usr/sbin/nvram ]; then
case $1 in
get) eval "echo \${$2:-\$(command nvram get $2)}";;
*) command nvram $*;;
esac
else
case $1 in
get) eval "echo \${$2:-\${DEFAULT_$2}}";;
*);;
esac
fi
}
# valid interface?
if_valid () (
ifconfig "$1" >&- 2>&- ||
[ "${1%%[0-9]}" = "br" ] ||
{
[ "${1%%[0-9]}" = "vlan" ] && (
i=${1#vlan}
hwname=$(nvram get vlan${i}hwname)
hwaddr=$(nvram get ${hwname}macaddr)
[ -z "$hwaddr" ] && return 1
vif=$(ifconfig -a | awk '/^eth.*'$hwaddr'/ {print $1; exit}' IGNORECASE=1)
debug "# vlan$i => $vif"
$DEBUG ifconfig $vif up
$DEBUG vconfig add $vif $i 2>&-
)
} ||
{ debug "# missing interface '$1' ignored"; false; }
)
bitcount () {
local c=$1
echo $((
c=((c>> 1)&0x55555555)+(c&0x55555555),
c=((c>> 2)&0x33333333)+(c&0x33333333),
c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
))
}
valid_netmask () {
return $((-($1)&~$1))
}
ip2int () (
set $(echo $1 | tr '\.' ' ')
echo $(($1<<24|$2<<16|$3<<8|$4))
)
int2ip () {
echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
}
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