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base-files: ipcalc.sh: Add support for decimal output

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This is useful if you later need to perform numeric range-checking
on addresses, i.e. to see if an address falls inside a CIDR range,
etc. and what interface it corresponds to.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This commit is contained in:
Philip Prindeville 2023-10-22 13:32:06 -06:00
parent 854739b32c
commit 5ee3a78242
1 changed files with 31 additions and 7 deletions
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38
package/base-files/files/bin/ipcalc.sh
View File

@ -4,11 +4,35 @@
PROG="$(basename "$0")"
# hook for library function
_ip2str() {
local var="$1" n="$2"
assert_uint32 "$n" || exit 1
if [ "$decimal" -ne 0 ]; then
export -- "$var=$n"
elif [ "$hexadecimal" -ne 0 ]; then
export -- "$var=$(printf "%x" "$n")"
else
ip2str "$@"
fi
}
usage() {
echo "Usage: $PROG address/prefix [ start limit ]" >&2
echo "Usage: $PROG [ -d | -x ] address/prefix [ start limit ]" >&2
exit 1
}
decimal=0
hexadecimal=0
if [ "$1" = "-d" ]; then
decimal=1
shift
elif [ "$1" = "-x" ]; then
hexadecimal=1
shift
fi
if [ $# -eq 0 ]; then
usage
fi
@ -51,14 +75,14 @@ hostmask=$((netmask ^ 0xffffffff))
network=$((ipaddr & netmask))
broadcast=$((network | hostmask))
ip2str IP "$ipaddr"
ip2str NETMASK "$netmask"
ip2str NETWORK "$network"
_ip2str IP "$ipaddr"
_ip2str NETMASK "$netmask"
_ip2str NETWORK "$network"
echo "IP=$IP"
echo "NETMASK=$NETMASK"
if [ "$prefix" -le 30 ]; then
ip2str BROADCAST "$broadcast"
_ip2str BROADCAST "$broadcast"
echo "BROADCAST=$BROADCAST"
fi
echo "NETWORK=$NETWORK"
@ -95,8 +119,8 @@ if [ "$start" -gt "$end" ]; then
exit 1
fi
ip2str START "$start"
ip2str END "$end"
_ip2str START "$start"
_ip2str END "$end"
if [ "$start" -le "$ipaddr" ] && [ "$ipaddr" -le "$end" ]; then
echo "error: address $IP inside range $START..$END" >&2