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 ] && return
  53
  54                 debug "# --- creating /etc/resolv.conf ---"
  55                 for dns in $(nvram get ${2}_dns); do
  56                         echo "nameserver $dns" >> /etc/resolv.conf
  57                 done
  58         ;;
  59         dhcp)
  60                 DHCP_IP=$(nvram get ${2}_ipaddr)
  61                 DHCP_NETMASK=$(nvram get ${2}_netmask)
  62                 $DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} broadcast + up
  63
  64                 DHCP_ARGS="-i $if ${DHCP_IP:+-r $DHCP_IP} -b -p $pidfile"
  65                 DHCP_HOSTNAME=$(nvram get ${2}_hostname)
  66                 DHCP_HOSTNAME=${DHCP_HOSTNAME%%.*}
  67                 [ -z $DHCP_HOSTNAME ] || DHCP_ARGS="$DHCP_ARGS -H $DHCP_HOSTNAME"
  68                 [ "$if_proto" = "pptp" ] && DHCP_ARGS="$DHCP_ARGS -n -q" || DHCP_ARGS="$DHCP_ARGS -R &"
  69                 ${DEBUG:-eval} "udhcpc $DHCP_ARGS"
  70         ;;
  71         none|"")
  72         ;;
  73         *)
  74                 [ -x "/sbin/ifup.$1" ] && { $DEBUG /sbin/ifup.$1 ${2}; exit; }
  75                 echo "### ifup ${2}: ignored ${2}_proto=\"$1\" (not supported)"
  76         ;;
  77         esac
  78 }
  79
  80 bitcount () {
  81   local c=$1
  82   echo $((
  83   c=((c>> 1)&0x55555555)+(c&0x55555555),
  84   c=((c>> 2)&0x33333333)+(c&0x33333333),
  85   c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
  86   c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
  87   c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
  88   ))
  89 }
  90
  91 valid_netmask () {
  92   return $((-($1)&~$1))
  93 }
  94
  95 ip2int () (
  96   set $(echo $1 | tr '\.' ' ')
  97   echo $(($1<<24|$2<<16|$3<<8|$4))
  98 )
  99
 100 int2ip () {
 101   echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
 102 }