[package] base-files: introduce /lib/functions/network.sh

This file will contain common procedures to deal with network interfaces.
Initially provides network_get_ipaddr(), network_get_ipaddr6(),
network_get_subnet() and network_get_subnet6() to determine the
primary IP addresses or subnets of a given logical interface.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31935 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 41 insertions, 0 deletions

diff --git a/package/base-files/files/lib/functions/network.sh b/package/base-files/files/lib/functions/network.sh
new file mode 100644
index 000000000..1b42133ba
--- /dev/null
+++ b/package/base-files/files/lib/functions/network.sh
@@ -0,0 +1,41 @@
+. /usr/share/libubox/jshn.sh
+
+__network_ipaddr()
+{
+	local __var="$1"
+	local __iface="$2"
+	local __family="$3"
+	local __prefix="${4:-0}"
+
+	local __tmp="$(ubus call network.interface."$__iface" status 2>/dev/null)"
+
+	json_load "${__tmp:-{}}"
+	json_get_type __tmp "ipv${__family}_address"
+
+	if [ "$__tmp" = array ]; then
+
+		json_select "ipv${__family}_address"
+		json_get_type __tmp 1
+
+		if [ "$__tmp" = object ]; then
+
+			json_select 1
+			json_get_var $__var address
+
+			[ $__prefix -gt 0 ] && {
+				json_get_var __tmp mask
+				eval "export -- \"$__var=\${$__var}/$__tmp\""
+			}
+
+			return 0
+		fi
+	fi
+
+	return 1
+}
+
+network_get_ipaddr()  { __network_ipaddr "$1" "$2" 4 0; }
+network_get_ipaddr6() { __network_ipaddr "$1" "$2" 6 0; }
+
+network_get_subnet()  { __network_ipaddr "$1" "$2" 4 1; }
+network_get_subnet6() { __network_ipaddr "$1" "$2" 6 1; }