Get static ipv6 info from /etc/config/dhcp

get_uci_static_ipv6.sh

#!/bin/sh

. /lib/functions.sh
. /lib/functions/network.sh

log() {
	logger -s -t "ddns[nas]" "$@"
}

join_ipv6() {
	local _prefix="$1"
	local _suffix="$2"
	owipcalc "$_prefix" add "$_suffix"
}

# 1. interface
get_ipv6_prefix() {
	local _interface="$1"

	local _ip6prefix="$(ifstatus $_interface | jq -Mr '."ipv6-prefix-assignment"[0].address')"
	if [ "$_ip6prefix" = "null" ]; then
		log "failed to get ipv6 prefix on $_interface"
		exit 0
	fi
	echo "$_ip6prefix"
}

dhcp_host_cb() {
	local _cfg="$1"
	local _hostname="$2"
	local _val="$3"

	local _name _hostid
	config_get _name "$_cfg" name
	config_get _hostid "$_cfg" hostid
	if [ "$_name" = "$_hostname" ]; then
		export ${NO_EXPORT:+-n} "${_val}=${_hostid}"
	fi
}

# 1. hostname
match_ipv6_suffix() {
	local _hostname="$1"

	config_load dhcp

	local _suffix
	config_foreach dhcp_host_cb host $_hostname _suffix

	if [ -z "$_suffix" ]; then
		log "failed to match ipv6 suffix for $_hostname"
		exit 0
	fi

	echo "$_suffix"
}

# 1. interface
# 2. hostname
get_ipv6_address() {
	local _if="$1"
	local _hn="$2"

	join_ipv6 "$(get_ipv6_prefix $_if)" "::$(match_ipv6_suffix $_hn)"
}

_HOSTNAME="$1"
_IFACE="${2:-lan}"

get_ipv6_address "$_IFACE" "$_HOSTNAME"