frankcrawford / bash_ipv6

IPv6 utiltiy functions written entirely in bash

bash_ipv6

Calculate IPv6 address segments entirely in bash

Based loosely on wg-ip (https://github.com/chmduquesne/wg-ip)

IPv6 definitions from https://en.wikipedia.org/wiki/IPv6_address

Frank Crawford - [e-mail] - 31-Jul-2021

Functions:

expand_ipv6 $ip

• expand out IPv6 ($ip) address with all digits

compress_ipv6 $ip

• returns compressed IPv6 address ($ip) under the form recommended by RFC5952

ipv6_prefix $ip $subnet

• extract the IPv6 routing prefix from $ip with subnet length $subnet

ipv6_subnetid $ip $subnet $fmt

• extract the local subnet ID from unicast address ($ip) with optional $fmt

ipv6_interface $ip

• IPv6 host or interface part of address ($ip)

ipv6_split_mask $ip/$mask

• returns 2 values $ip and $mask

is_ipv6 $ip

• tests if address ($ip) is a valid IPv6 in either the expanded form or the compressed one

ipv6_type $ip

• return IPv6 address ($ip) category