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=$1
   8 awk="command awk"
   9
  10 # Helper function for converting a hex (or decimal) netmask into CIDR format
  11 awk_mask2cdr='
  12 function mask2cdr(mask) {
  13     if(mask ~ /[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/) {
  14         split(mask,d,".");
  15         mask = sprintf("0x%x%x%x%x",d[1],d[2],d[3],d[4]);
  16     };
  17     sub("^0x","",mask);
  18     cidr=0;
  19     while(mask != "") {
  20         digit=substr(mask,1,1);
  21         mask=substr(mask,2);
  22         if(digit ~ /f|F/) cidr += 4;
  23         if(digit ~ /e|E/) cidr += 3;
  24         if(digit ~ /c|C/) cidr += 2;
  25         if(digit ~ /8/) cidr += 1;
  26     };
  27     return cidr
  28 };'
  29 # Display the final results
  30 awk_print_ifdata='
  31 iflen=0;
  32 for ( ifnam in ifdata ) { if(length(ifnam)>iflen) iflen=length(ifnam) };
  33 for ( ifnam in ifdata ) { split(ifdata[ifnam], data, "^"); for (v in data) { if (length(data[v])>1) printf("%-" int(iflen+1) "s %s\n", ifnam, data[v]) }}
  34 '
  35
  36 case "$UNAME" in
  37     Darwin|FreeBSD|AIX)
  38         test -n "$IFACE" && if_args="$IFACE"
  39         test -z "$if_args" && if_args="-a"
  40         ifconfig $if_args | $awk "$awk_mask2cdr"'
  41             /^[a-z0-9:]+/ { ifnam=$1 };
  42             $1 == "inet" { ifdata[ifnam]=ifdata[ifnam] "^" $2 "/" mask2cdr($4) };
  43             $1 == "inet6" && !/scopeid|inet6 ::1|temporary/ { ifdata[ifnam]=ifdata[ifnam] "^" $2 "/" $4 };
  44             END { '"$awk_print_ifdata"'}'
  45         ;;
  46     Linux)
  47         test -n "$IFACE" && if_args="$IFACE"
  48         test -z "$if_args" && if_args="-a"
  49         ifconfig $if_args | $awk "$awk_mask2cdr"'
  50             /^[^ ]+/ { ifnam=$1 ":" };
  51             $1 == "inet" { ifdata[ifnam]=ifdata[ifnam] "^" substr($2,6) "/" mask2cdr(substr($0,index($0,"Mask:")+5)) };
  52             $1 == "inet6" && /Scope:Global/ { ifdata[ifnam]=ifdata[ifnam] "^" $3 }
  53             END { '"$awk_print_ifdata"'}'
  54         ;;
  55     SunOS)
  56         test -x "/usr/gnu/bin/awk" && awk=/usr/gnu/bin/awk
  57         test -n "$IFACE" && if_args="$IFACE"
  58         test -z "$if_args" && if_args="-a"
  59         ifconfig $if_args | $awk "$awk_mask2cdr"'
  60             /^[a-z0-9:]+/ { ifnam=$1 };
  61             $1 == "inet" { ifdata[ifnam]=ifdata[ifnam] "^" $2 "/" mask2cdr($4) };
  62             $1 == "inet6" && !/inet6 ::|inet6 fe80:/ { ifdata[ifnam]=ifdata[ifnam] "^" $2 }
  63             END { '"$awk_print_ifdata"'}'
  64         ;;
  65     *)
  66         echo "Unhandled host-type: $UNAME"
  67 esac