mirror of
https://github.com/tonusoo/koduinternet-cpe
synced 2024-12-05 01:00:59 +02:00
76 lines
1.7 KiB
Plaintext
76 lines
1.7 KiB
Plaintext
|
#!/usr/bin/env bash
|
||
|
|
|
||
|
|
# Title : mcast_converter
|
||
|
|
# Last modified date : 12.04.2023
|
||
|
|
# Author : Martin Tonusoo
|
||
|
|
# Description : Script converts IPv4 multicast address to
|
||
|
|
# multicast MAC address or multicast MAC
|
||
|
|
# address to IPv4 multicast addresses depending
|
||
|
|
# on the input.
|
||
|
|
# Options : IPv4 multicast address or multicast MAC address.
|
||
|
|
# Notes :
|
||
|
|
|
||
|
|
|
||
|
|
# 224.0.0.0 - 239.255.255.255
|
||
|
|
read -r mip_regex << EOF
|
||
|
|
^2(2[4-9]|3[0-9])\.\
|
||
|
|
(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.\
|
||
|
|
(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.\
|
||
|
|
(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)$
|
||
|
|
EOF
|
||
|
|
|
||
|
|
|
||
|
|
# 01:00:5e:00:00:00 - 01:00:5e:7f:ff:ff
|
||
|
|
read -r mac_regex << EOF
|
||
|
|
^01:00:5e:\
|
||
|
|
([0-7][0-9a-f]):\
|
||
|
|
([0-9a-f]{2}):\
|
||
|
|
([0-9a-f]{2})$
|
||
|
|
EOF
|
||
|
|
|
||
|
|
|
||
|
|
if [[ "$1" =~ $mip_regex ]]; then
|
||
|
|
|
||
|
|
for (( n="${BASH_REMATCH[2]}"; n>0; n >>= 1 )); do
|
||
|
|
o2_bits="$(( n & 1 ))$o2_bits"
|
||
|
|
done
|
||
|
|
|
||
|
|
printf -v o2_bits "%08d" "$o2_bits"
|
||
|
|
o2_bits="0${o2_bits:1}"
|
||
|
|
|
||
|
|
printf "%s:%02x:%02x:%02x\n" \
|
||
|
|
"01:00:5e" \
|
||
|
|
"$(( 2#$o2_bits ))" \
|
||
|
|
"${BASH_REMATCH[3]}" \
|
||
|
|
"${BASH_REMATCH[4]}"
|
||
|
|
|
||
|
|
elif [[ "$1" =~ $mac_regex ]]; then
|
||
|
|
|
||
|
|
o4_dec=$(( 16#"${BASH_REMATCH[1]}" ))
|
||
|
|
|
||
|
|
for (( n="$o4_dec"; n>0; n >>= 1 )); do
|
||
|
|
o4_bits="$(( n & 1 ))$o4_bits"
|
||
|
|
done
|
||
|
|
|
||
|
|
printf -v o4_bits "%08d" "$o4_bits"
|
||
|
|
o4_bits="${o4_bits:1}"
|
||
|
|
|
||
|
|
for bits in {0..1}{0..1}{0..1}{0..1}{0..1}; do
|
||
|
|
|
||
|
|
printf "%d.%d.%d.%d\n" \
|
||
|
|
$(( 2#"1110${bits:0:4}" )) \
|
||
|
|
$(( 2#"${bits:4:1}$o4_bits" )) \
|
||
|
|
$(( 16#"${BASH_REMATCH[2]}" )) \
|
||
|
|
$(( 16#"${BASH_REMATCH[3]}" ))
|
||
|
|
|
||
|
|
done
|
||
|
|
|
||
|
|
else
|
||
|
|
|
||
|
|
printf "%s\n%s\n" \
|
||
|
|
"Invalid multicast MAC or IPv4 address" \
|
||
|
|
"Examples: '${0##*/} 01:00:5e:00:99:0a' or '${0##*/} 239.1.2.100'" >&2
|
||
|
|
exit 1
|
||
|
|
|
||
|
|
fi
|