statd: ignore interfaces with group = internal

Don't add any info about interfaces which has "group" = "internal" to
the operational datastore.

Signed-off-by: Richard Alpe <richard@bit42.se>

src/statd/iface-ip-link.c

@@ -393,3 +393,38 @@ int ly_add_ip_link(const struct ly_ctx *ctx, struct lyd_node **parent, char *ifn
 	return SR_ERR_OK;
 }
 
+/* Returns 1 if the group is "group", 0 if it's not and -1 on error */
+int ip_link_check_group(char *ifname, const char *group)
+{
+	json_t *j_iface;
+	json_t *j_root;
+	json_t *j_val;
+
+	j_root = json_get_ip_link(ifname);
+	if (!j_root) {
+		ERROR("Error, parsing ip-link JSON");
+		return -1;
+	}
+	if (json_array_size(j_root) != 1) {
+		ERROR("Error, expected JSON array of single iface");
+		json_decref(j_root);
+		return -1;
+	}
+
+	j_iface = json_array_get(j_root, 0);
+
+	j_val = json_object_get(j_iface, "group");
+	if (!json_is_string(j_val)) {
+		ERROR("Error, expected a JSON string for 'group'");
+		json_decref(j_root);
+		return -1;
+	}
+	if (strcmp(json_string_value(j_val), group) == 0) {
+		json_decref(j_root);
+		return 1;
+	}
+
+	json_decref(j_root);
+
+	return 0;
+}

src/statd/iface-ip-link.h

@@ -3,6 +3,7 @@
 
 #include <srx/lyx.h>
 
+int ip_link_check_group(char *ifname, const char *group);
 int ly_add_ip_link(const struct ly_ctx *ctx, struct lyd_node **parent, char *ifname);
 
 #endif

src/statd/statd.c

@@ -140,6 +140,12 @@ static int sr_ifaces_cb(sr_session_ctx_t *session, uint32_t, const char *path,
 		return SR_ERR_INTERNAL;
 	}
 
+	/* Skip internal interfaces (such as dsa0) */
+	if (ip_link_check_group(sub->ifname, "internal") == 1) {
+		err = SR_ERR_OK;
+		goto out;
+	}
+
 	err = ly_add_ip_link(ctx, parent, sub->ifname);
 	if (err) {
 		ERROR("Error, adding ip link info");