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Calculate IP Network Scheme
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| #!/bin/bash | |
| ####################################################### | |
| # | |
| # Calculate IP Network Scheme | |
| # | |
| # Usage: | |
| # | |
| # ipcalc.sh <cidr-notation> | |
| # | |
| # <cidr-notation> - <ip-address>/<bit-mask> | |
| # | |
| # Ex. | |
| # | |
| # $ ipcalc.sh 192.168.1.100/24 | |
| # Network: 192.168.1.0/24 | |
| # First IP: 192.168.1.1 | |
| # Last IP: 192.168.1.254 | |
| # Subnet Mask: 255.255.255.0 | |
| # Broadcast Address: 192.168.1.255 | |
| # Host Count: 254 | |
| # | |
| # | |
| ####################################################### | |
| _build_net_mask() { | |
| ( | |
| for i in $(seq 1 $1); do | |
| printf "1" | |
| done | |
| z="$((32-$1))" | |
| for i in $(seq 1 $z); do | |
| printf "0" | |
| done | |
| echo "" | |
| ) | sed 's/\([01]\{8\}\)/\1\n/g' | grep -v '^$' | while read line; do | |
| echo $((2#$line)) | |
| done | |
| } | |
| _validate_ip() { | |
| if [ $1 -gt 0 ] && [ $1 -lt 256 ] && [ $2 -gt 0 ] && [ $2 -lt 256 ] && [ $3 -gt 0 ] && [ $3 -lt 256 ] && [ $4 -gt 0 ] && [ $4 -lt 256 ]; then | |
| echo "0" | |
| else | |
| echo "1" | |
| fi | |
| } | |
| if [ -n "$1" ]; then | |
| CIDR="$@" | |
| IP="$(sed 's/\/[0-9]\+//g' <<< "$CIDR")" | |
| MASK="$(sed 's/^.*\///g' <<< "$CIDR")" | |
| OCTETS="$(awk -F '.' '{print NF}' <<< "$IP")" | |
| if [ $MASK -gt 0 ] && [ $MASK -lt 33 ] && [ $OCTETS -eq 4 ]; then | |
| IPAR=() | |
| IPAR[0]="$(awk 'BEGIN { FS="." } { print $1 }' <<< "$IP")" | |
| IPAR[1]="$(awk 'BEGIN { FS="." } { print $2 }' <<< "$IP")" | |
| IPAR[2]="$(awk 'BEGIN { FS="." } { print $3 }' <<< "$IP")" | |
| IPAR[3]="$(awk 'BEGIN { FS="." } { print $4 }' <<< "$IP")" | |
| if [ $(_validate_ip ${IPAR[@]}) -eq 1 ]; then | |
| echo "Invalid IP Address" | |
| exit 1 | |
| fi | |
| MASKAR=() | |
| for octet in $(_build_net_mask $MASK); do | |
| MASKAR+=($octet) | |
| done | |
| LOWADDR=() | |
| UPRADDR=() | |
| BRDADDR=() | |
| NETADDR=() | |
| for i in $(seq 0 3); do | |
| ADR=$(( ${MASKAR[$i]} & ${IPAR[$i]} )) | |
| if [ $ADR -eq 0 ]; then | |
| if [ $i -eq 3 ]; then | |
| UPRADDR+=("254") | |
| LOWADDR+=("1") | |
| BRDADDR+=("255") | |
| NETADDR+=("0") | |
| else | |
| UP=$(( ${MASKAR[$i]} ^ 255 )) | |
| UPRADDR+=($(($UP + $ADR))) | |
| LOWADDR+=($ADR) | |
| BRDADDR+=($(($UP + $ADR))) | |
| NETADDR+=($ADR) | |
| fi | |
| elif [ $ADR -eq 255 ]; then | |
| if [ $i -eq 3 ]; then | |
| UPRADDR+=("254") | |
| LOWADDR+=("254") | |
| BRDADDR+=("255") | |
| NETADDR+=($ADR) | |
| else | |
| UP=$(( ${MASKAR[$i]} ^ 255 )) | |
| UPRADDR+=($(($UP + $ADR))) | |
| LOWADDR+=($ADR) | |
| BRDADDR+=($(($UP + $ADR))) | |
| NETADDR+=($ADR) | |
| fi | |
| else | |
| UP=$(( ${MASKAR[$i]} ^ 255 )) | |
| UPRADDR+=($(($UP + $ADR))) | |
| LOWADDR+=($ADR) | |
| BRDADDR+=($(($UP + $ADR))) | |
| NETADDR+=($ADR) | |
| fi | |
| done | |
| printf "Network: " | |
| echo "${NETADDR[@]}/$MASK" | sed 's/[ \t]\+/./g' | |
| printf "First IP: " | |
| echo "${LOWADDR[@]}" | sed 's/[ \t]\+/./g' | |
| printf "Last IP: " | |
| echo "${UPRADDR[@]}" | sed 's/[ \t]\+/./g' | |
| printf "Subnet Mask: " | |
| echo "${MASKAR[@]}" | sed 's/[ \t]\+/./g' | |
| printf "Broadcast Address: " | |
| echo "${BRDADDR[@]}" | sed 's/[ \t]\+/./g' | |
| printf "Host Count: " | |
| bc <<< "(2^(32-$MASK))-2" | rev | sed 's/\([0-9]\{3\}\)/\1,/g;s/,$//g' | rev | |
| else | |
| echo "Invalid CIDR notation" | |
| fi | |
| else | |
| echo "calc <cidr-notation>" | |
| fi |
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