185 lines
2.3 KiB
Bash
185 lines
2.3 KiB
Bash
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#!/bin/ksh
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# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
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#egan@us.ibm.com
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#(C)IBM Corp
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#
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#RH ipcalc "cleanroom" clone in ksh
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#no --silent option, just 2>/dev/null
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#
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MYNAME=$0
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function validateip
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{
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set -A ipa $(echo $* | tr '.' ' ')
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integer nipa=${#ipa[*]}
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if ((nipa != 4))
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then
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return 1
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fi
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integer a=${ipa[0]}
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for j in 0 1 2 3
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do
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integer a=${ipa[$j]}
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if ((a > 255))
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then
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return 4
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fi
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done
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}
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function usage {
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echo "\nUsage: ${MYNAME} [--hostname] [--broadcast] [--network] [--netmask] ip [netmask]\n"
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}
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if [ "$#" = "0" ]
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then
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usage >&2
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exit 1
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fi
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HOSTNAME=0
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BROADCAST=0
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NETWORK=0
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NETMASK=0
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for i in $*
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do
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case "$i" in
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-*)
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case "$i" in
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"--hostname")
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HOSTNAME=1
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shift
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;;
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"--broadcast")
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BROADCAST=1
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shift
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;;
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"--network")
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NETWORK=1
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shift
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;;
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"--netmask")
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NETMASK=1
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shift
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;;
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*)
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usage >&2
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exit 1
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;;
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esac
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;;
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esac
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done
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if [ -z "$1" ]
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then
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usage >&2
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exit 1
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fi
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IP=$1
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shift
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NM=""
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if [ ! -z "$1" ]
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then
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NM=$1
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shift
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fi
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if [ "$#" -gt "0" ]
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then
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usage >&2
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exit 1
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fi
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if validateip $IP
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then
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:
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else
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echo "$0: bad ip $IP" >&2
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exit 1
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fi
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if [ ! -z "$NM" ]
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then
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if validateip $NM
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then
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:
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else
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echo "$0: bad netmask $NM" >&2
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exit 1
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fi
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fi
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if [ "$BROADCAST" = "1" -o "$NETWORK" = "1" ]
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then
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if [ -z "$NM" ]
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then
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echo "$0: netmask expected" >&2
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exit 1
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fi
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fi
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if [ "$HOSTNAME" = "1" ]
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then
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if host $IP >/dev/null 2>&1
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then
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HOSTNAME=$(host $IP 2>/dev/null | awk '{print $5}' | awk -F. '{print $1}')
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echo "HOSTNAME=$HOSTNAME"
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else
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echo "$0: cannot find hostname for $IP: Unknown host" >&2
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fi
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fi
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if [ "$BROADCAST" = "1" -o "$NETWORK" = "1" ]
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then
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set -A ipa $(echo $IP | tr '.' ' ')
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set -A nma $(echo $NM | tr '.' ' ')
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NW=""
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BC=""
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for j in 0 1 2 3
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do
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integer a=${ipa[$j]}
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integer b=${nma[$j]}
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integer c=a\&b
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NW="$NW$c."
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integer d=b\^255
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integer e=c\|d
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BC="$BC$e."
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done
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NW=$(echo $NW | sed 's/.$//')
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BC=$(echo $BC | sed 's/.$//')
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if [ "$BROADCAST" = "1" ]
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then
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echo "BROADCAST=$BC"
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fi
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if [ "$NETWORK" = "1" ]
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then
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echo "NETWORK=$NW"
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fi
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fi
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if [ "$NETMASK" = "1" ]
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then
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if [ -z "$NM" ]
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then
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integer ipa=$(echo $IP | awk -F. '{print $1}')
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NM=255.255.0.0
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if((ipa < 128))
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then
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NM=255.0.0.0
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fi
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if((ipa > 191))
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then
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NM=255.255.255.0
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fi
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fi
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echo "NETMASK=$NM"
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fi
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exit 0
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