[PATCH 2/3] Add new function ip_get__assigned_addresses_from_net()

[Jonatan Schlag <jonatan.schlag@ipfire.org>]

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This function is neede by IPsec to set the routes correctly.
We can now now find a source IP for a given net.
This way is ugly because the source IP
is unpredictable if we get multiple IPs.

Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
 src/functions/functions.ip | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/functions/functions.ip b/src/functions/functions.ip
index 3b43da7..ef40bcc 100644
--- a/src/functions/functions.ip
+++ b/src/functions/functions.ip
@@ -205,3 +205,28 @@ ip_address_del() {
 
 	return ${EXIT_OK}
 }
+
+# Get all currently assigned addresse for a given network
+ip_get_assigned_addresses_from_net() {
+	local net=${1}
+	shift
+	local args="$@"
+
+	assert ip_net_is_valid ${net}
+
+	local line
+	local ips
+
+	# We read the output of $(ip addr show to ${net} ${args})
+	while read -r line; do
+		# We are only interested in lines which start with inet or inet6
+		[[ "${line}" =~ ^(inet6 |inet ) ]] || continue
+
+		# We need the second word the line
+		line=(${line})
+		list_append "ips" "$(ip_split_prefix "${line[1]}")"
+	done <<< "$(ip addr show to "${net}" ${args})"
+
+	# We sort the list to get the lowest IP as first item
+	print "$(list_sort ${ips})"
+}
-- 
2.6.3