[PATCH 2/6] alfred: update stored interface list on interface change

[Sven Eckelmann <sven@narfation.org>]

The interface list received via ALFRED_CHANGE_INTERFACE was passed to
netsock_set_interfaces() but globals->net_iface kept the value from the
daemon start. But the stale string is used by unix_sock_add_data() to
decide whether interface operations are disabled ('none'). And for the none
interface, it is required to be in primary mode and to prefill the
data->source address.

Store a copy of the new interface list in globals->net_iface to dynamically
switch between the disabled/not disabled mode.

Fixes: 94b3c4b5744f ("alfred: receive data with valid source on unix sock without active interface")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 unix_sock.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/unix_sock.c b/unix_sock.c
index e6b44da..64fde70 100644
--- a/unix_sock.c
+++ b/unix_sock.c
@@ -365,6 +365,7 @@ unix_sock_change_iface(struct globals *globals,
 		       struct alfred_change_interface_v0 *change_iface,
 		       int client_sock)
 {
+	char *net_iface;
 	int ret = -1;
 	int len;
 
@@ -383,6 +384,13 @@ unix_sock_change_iface(struct globals *globals,
 		}
 	}
 
+	net_iface = strdup(change_iface->ifaces);
+	if (!net_iface)
+		goto err;
+
+	free(globals->net_iface);
+	globals->net_iface = net_iface;
+
 	netsock_set_interfaces(globals, change_iface->ifaces);
 
 	ret = 0;

-- 
2.47.3