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 $*;;
  10   esac
  11 }
  12 [ "$FAILSAFE" = "true" ] && . /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 '$1' ignored"; false; }
  33 )
  34
  35 do_ifup() {
  36         if_proto=$(nvram get ${2}_proto)
  37         if=$(nvram get ${2}_ifname)
  38         [ "${if%%[0-9]}" = "ppp" ] && if=$(nvram get ${if_proto}_ifname)
  39
  40         pidfile=/var/run/${if}.pid
  41         [ -f $pidfile ] && $DEBUG kill $(cat $pidfile)
  42
  43         case "$1" in
  44         static)
  45                 ip=$(nvram get ${2}_ipaddr)
  46                 netmask=$(nvram get ${2}_netmask)
  47                 gateway=$(nvram get ${2}_gateway)
  48
  49                 $DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} broadcast + up
  50                 ${gateway:+$DEBUG route add default gw $gateway}
  51
  52                 [ -f /etc/resolv.conf ] || {
  53                         debug "# --- creating /etc/resolv.conf ---"
  54                         for dns in $(nvram get ${2}_dns); do
  55                                 echo "nameserver $dns" >> /etc/resolv.conf
  56                         done
  57                 }
  58
  59                 env -i ACTION="ifup" INTERFACE="${2}" PROTO=static /sbin/hotplug "iface" &
  60         ;;
  61         dhcp)
  62                 DHCP_IP=$(nvram get ${2}_ipaddr)
  63                 DHCP_NETMASK=$(nvram get ${2}_netmask)
  64                 $DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} broadcast + up
  65
  66                 DHCP_ARGS="-i $if ${DHCP_IP:+-r $DHCP_IP} -b -p $pidfile"
  67                 DHCP_HOSTNAME=$(nvram get ${2}_hostname)
  68                 DHCP_HOSTNAME=${DHCP_HOSTNAME%%.*}
  69                 [ -z $DHCP_HOSTNAME ] || DHCP_ARGS="$DHCP_ARGS -H $DHCP_HOSTNAME"
  70                 [ "$if_proto" = "pptp" ] && DHCP_ARGS="$DHCP_ARGS -n -q" || DHCP_ARGS="$DHCP_ARGS -R &"
  71                 oldpid=$(cat $pidfile)
  72                 ${DEBUG:-eval} "udhcpc $DHCP_ARGS"
  73                 pidof udhcpc | grep "$oldpid" >&- 2>&- && {
  74                         sleep 1
  75                         kill -9 $oldpid
  76                 }
  77                 # hotplug events are handled by /usr/share/udhcpc/default.script
  78         ;;
  79         none|"")
  80         ;;
  81         *)
  82                 [ -x "/sbin/ifup.$1" ] && { $DEBUG /sbin/ifup.$1 ${2}; exit; }
  83                 echo "### ifup ${2}: ignored ${2}_proto=\"$1\" (not supported)"
  84         ;;
  85         esac
  86 }
  87
  88 bitcount () {
  89   local c=$1
  90   echo $((
  91   c=((c>> 1)&0x55555555)+(c&0x55555555),
  92   c=((c>> 2)&0x33333333)+(c&0x33333333),
  93   c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
  94   c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
  95   c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
  96   ))
  97 }
  98
  99 valid_netmask () {
 100   return $((-($1)&~$1))
 101 }
 102
 103 ip2int () (
 104   set $(echo $1 | tr '\.' ' ')
 105   echo $(($1<<24|$2<<16|$3<<8|$4))
 106 )
 107
 108 int2ip () {
 109   echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
 110 }