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Code Editor : get_primary_ip4

#!/bin/sh

# Get the IP address of the primary network interface

error_exit()
{
    echo $1
    exit 1
}

unwrap()
{
    $awk -v cols=$1 -v n=0 \
    ' {
        for (i=1; i<=NF; ++i) {
          if (n != 0) printf " ";
          printf "%s", $i;
          if (++n == cols) {
            printf "\n";
            n = 0;
          }
        }
      }' $2
}

find_column()
{
     $awk -v target="$1" \
     ' {
         for (i=1; i<=NF; ++i) {
           if ($i ~ target) {
             print i; exit
           }
         }
       }'
}

primary_ip_linux()
{
    # On Linux, we can get the network interface corresponding to the
    # default route from /proc/net/route, and feed it into "ifconfig"
    # to get the IP address.
    interf=`$awk '$2=="00000000" && int($4/2)%2==1 {print $1; exit}' /proc/net/route`
    [ -n "$interf" ] || error_exit "No default network interface"
    ip=`$ifconfig $interf 2>/dev/null | \
        $tr ':' ' ' | \
        $awk '$1=="inet" && $2=="addr" {print $3; exit}
              $1=="inet" {print $2; exit}'`
    [ -n "$ip" ] || error_exit "No IP address found"
    echo $ip
    exit 0
}

primary_ip_hpux()
{
    # On HP-UX, "netstat -rnv" tells us the network interface corresponding
    # to the default route, and "ifconfig" tells us its IP address. However,
    # the netstat output needs some pre-processing.

# Get column headers from second line of netstat output
    headers=`$netstat -rnv 2>/dev/null | $awk 'FNR == 2'`

# Find the relevant columns, and the total number of columns
    netmask_col=`echo $headers | find_column '/Netmask$'`
    flags_col=`echo $headers | find_column '^Flags$'`
    iface_col=`echo $headers | find_column '^Interface$'`
    columns=`echo $headers | $awk '{ print NF }'`

# In case we didn't find some of the columns, hard-code them
    # based on the total number of columns found.

if [ "$columns" = "6" ]; then
        [ -z "$netmask_col" ] && netmask_col=1
        [ -z "$flags_col" ] && flags_col=3
        [ -z "$iface_col" ] && iface_col=5
    elif [ "$columns" = "7" ]; then
        [ -z "$netmask_col" ] && netmask_col=1
        [ -z "$flags_col" ] && flags_col=3
        [ -z "$iface_col" ] && iface_col=6
    fi

[ -z "$netmask_col" ] && error_exit "Could not find Netmask column"
    [ -z "$flags_col" ] && error_exit "Could not find Flags column"
    [ -z "$iface_col" ] && error_exit "Could not find Interface column"

interf=`$netstat -rnv 2>/dev/null | \
            $awk 'FNR > 1' | \
            unwrap $columns | \
            $awk -v flags_col=$flags_col \
                 -v netmask_col=$netmask_col \
                 -v iface_col=$iface_col \
                '$netmask_col ~ "/0\.0\.0\.0$" && $flags_col ~ "G" {
                   print $iface_col; exit
                 }'`
    [ -n "$interf" ] || error_exit "No default network interface"
    ip=`$ifconfig $interf 2>/dev/null | \
        $awk '$1 == "inet" { print $2; exit }'`
    [ -n "$ip" ] || error_exit "No IP address found"
    echo $ip
    exit 0
}

primary_ip_solaris()
{
    # On Solaris, "netstat -rnv" tells us the default gateway. We check this
    # against the IP address and netmask of each interface obtained from
    # ifconfig to find a match
    defrouter=`$netstat -rnv 2>/dev/null | \
               $awk '$2=="0.0.0.0" {print $3; exit}'`
    [ -n "$defrouter" ] || error_exit "No default router found"
    prog='function mask_byte(mask, byte)
          {
            if (mask == "00") return 0;
            else if (mask == "80") div = 128;
            else if (mask == "c0") div = 64;
            else if (mask == "e0") div = 32;
            else if (mask == "f0") div = 16;
            else if (mask == "f8") div = 8;
            else if (mask == "fc") div = 4;
            else if (mask == "fe") div = 2;
            else return byte;
            return int(byte / div) * div;
          }
          BEGIN {
            if (split(def, defrouter, "\\.") != 4)
              exit(1);
          }
          $1=="inet" && $3="netmask" {
            n = split($2, nums, "\\.")
            if (n != 4) next;
            for (i=0; i<4; ++i)
              if (mask_byte(substr($4, 2*i+1, 2), int(nums[i+1])) != mask_byte(substr($4, 2*i+1, 2), int(defrouter[i+1])))
                next;
            print $2;
            exit(0);
          }'
    ip=`$ifconfig -au | \
        $awk -v def=$defrouter "$prog"`
    [ -n "$ip" ] || error_exit "No IP address found"
    echo $ip
    exit 0
}

primary_ip_aix_darwin_bsd()
{
    # On AIX and Darwin, "netstat -rn" tells us the network interface
    # corresponding to the default route, and "ifconfig" tells us its IP
    # address. We look for entry where the fist field is not an IP address
    # (on English systems it will be "default"), the second is an IP address
    # and the third contains an upper-case G.
    interf=`$netstat -rn 2>/dev/null | \
            $awk '($1 !~ /^[0-9:.\/]+$/ || $1 == "0.0.0.0") \
               && $2  ~ /^[0-9:.\/]+$/ \
               && $3  ~ /G/ \
               {print $6; exit}'`
    [ -n "$interf" ] || error_exit "No default network interface"
    ip=`$ifconfig $interf 2>/dev/null | \
        $awk '$1 == "inet" { print $2; exit }'`
    [ -n "$ip" ] || error_exit "No IP address found"
    echo $ip
    exit 0
}

# Default program locations
awk=/usr/bin/awk
ifconfig=/sbin/ifconfig
netstat=/bin/netstat
tr=/usr/bin/tr

# Override any locale settings that might affect the output of commands
if test "${LANG+set}" = set; then LANG=C; export LANG; fi
if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi
if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi
if test "${LC_CTYPE+set}" = set; then LC_CTYPE=C; export LC_CTYPE; fi

# Platform-specific overrides
SYSNAME=`uname -s`
case "$SYSNAME" in
    Linux)
        primary_ip_linux
        ;;
    SunOS)
        awk=/usr/bin/nawk
        netstat=/usr/bin/netstat
        primary_ip_solaris
        ;;
    HP-UX)
        ifconfig=/usr/sbin/ifconfig
        netstat=/usr/bin/netstat
        primary_ip_hpux
        ;;
    AIX)
        ifconfig=/usr/sbin/ifconfig
        netstat=/usr/bin/netstat
        primary_ip_aix_darwin_bsd
        ;;
    Darwin)
        netstat=/usr/sbin/netstat
        primary_ip_aix_darwin_bsd
        ;;
    FreeBSD)
        netstat=/usr/bin/netstat
        primary_ip_aix_darwin_bsd
        ;;
    *)
        error_exit "Unsupported platform"
        ;;
esac

${this.title}

Code Editor : get_primary_ip4