bin/ipaddr

   1 #!/bin/sh
   2 # Usage: ipaddr [<iface>]
   3 # Show the IP address (IPv4 and/or IPv6) for interface <iface> or all interfaces
   4 # when no <iface> given.
   5
   6 UNAME=$(uname)
   7 IFACE=$1
   8 awk="command awk"
   9
  10 # Helper function for converting a hex (or decimal) netmask into CIDR format
  11 awk_mask2cdr='
  12 function mask2cdr(mask) {
  13     if(mask ~ /[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/) {
  14         split(mask,d,".");
  15         mask = sprintf("0x%x%x%x%x",d[1],d[2],d[3],d[4]);
  16     };
  17     sub("^0x","",mask);
  18     cidr=0;
  19     while(mask != "") {
  20         digit=substr(mask,1,1);
  21         mask=substr(mask,2);
  22         if(digit ~ /f|F/) cidr += 4;
  23         if(digit ~ /e|E/) cidr += 3;
  24         if(digit ~ /c|C/) cidr += 2;
  25         if(digit ~ /8/) cidr += 1;
  26     };
  27     return cidr
  28 };'
  29
  30 case "$UNAME" in
  31     Darwin|FreeBSD)
  32         test -n "$IFACE" && if_args="$IFACE"
  33         test -z "$if_args" && if_args="-a"
  34         ifconfig $if_args | $awk "$awk_mask2cdr"'
  35             /^[a-z-0-9]/ {iface=$1};
  36             $1 == "inet" {printf("%-10s %s/%s\n",iface,$2,mask2cdr($4))};
  37             $1 == "inet6" && !/scopeid|inet6 ::1|temporary/ {printf("%-10s %s/%s\n",iface,$2,$4)}'
  38         ;;
  39     Linux)
  40         test -n "$IFACE" && if_args="$IFACE"
  41         test -z "$if_args" && if_args="-a"
  42         ifconfig $if_args | $awk "$awk_mask2cdr"'
  43             /^[^ ]+/ {iface=$1};
  44             $1 == "inet" { printf("%-10s %s/%s\n", iface ":", substr($2,6), mask2cdr(substr($0,index($0,"Mask:")+5))) };
  45             $1 == "inet6" && /Scope:Global/ { printf("%-10s %s\n", iface ":", $3) }'
  46         ;;
  47     SunOS)
  48         test -x "/usr/gnu/bin/awk" && awk=/usr/gnu/bin/awk
  49         test -n "$IFACE" && if_args="$IFACE"
  50         test -z "$if_args" && if_args="-a"
  51         ifconfig $if_args | $awk "$awk_mask2cdr"'
  52             /^[a-z0-9]+/ {iface=$1};
  53             $1 == "inet" { printf("%-10s %s/%s\n", iface, $2, mask2cdr($4)) };
  54             $1 == "inet6" && !/inet6 ::|inet6 fe80:/ { printf("%-10s %s\n", iface, $2) }'
  55         ;;
  56     *)
  57         echo "Unhandled host-type: $UNAME"
  58 esac