add some infrastructure code for proto handlers

1 files changed, 64 insertions, 3 deletions

diff --git a/proto.c b/proto.c
index b16600c..ea6e138 100644
--- a/proto.c
+++ b/proto.c
@@ -6,6 +6,20 @@
 #include "interface.h"
 #include "proto.h"
 
+static struct avl_tree handlers;
+
+void add_proto_handler(struct proto_handler *p)
+{
+	if (!handlers.comp)
+		avl_init(&handlers, avl_strcmp, false, NULL);
+
+	if (p->avl.key)
+		return;
+
+	p->avl.key = p->name;
+	avl_insert(&handlers, &p->avl);
+}
+
 static void
 default_proto_free(struct interface_proto_state *proto)
 {
@@ -13,24 +27,71 @@ default_proto_free(struct interface_proto_state *proto)
 }
 
 static int
-default_proto_handler(struct interface_proto_state *proto,
+invalid_proto_handler(struct interface_proto_state *proto,
+		      enum interface_proto_cmd cmd, bool force)
+{
+	return -1;
+}
+
+static int
+no_proto_handler(struct interface_proto_state *proto,
 		      enum interface_proto_cmd cmd, bool force)
 {
 	return 0;
 }
 
-struct interface_proto_state *get_default_proto(void)
+static struct interface_proto_state *get_default_proto(void)
 {
 	struct interface_proto_state *proto;
 
 	proto = calloc(1, sizeof(*proto));
-	proto->handler = default_proto_handler;
 	proto->free = default_proto_free;
 	proto->flags = PROTO_FLAG_IMMEDIATE;
 
 	return proto;
 }
 
+void proto_attach_interface(struct interface *iface, struct uci_section *s)
+{
+	struct interface_proto_state *state = NULL;
+	struct proto_handler *proto = NULL;
+	const char *proto_name;
+	const char *error = NULL;
+
+	proto_name = uci_lookup_option_string(uci_ctx, s, "proto");
+	if (!proto_name) {
+		error = "NO_PROTO";
+		goto error;
+	}
+
+	if (!strcmp(proto_name, "none")) {
+		state = get_default_proto();
+		state->handler = no_proto_handler;
+		goto out;
+	}
+
+	if (handlers.comp)
+		proto = avl_find_element(&handlers, proto_name, proto, avl);
+
+	if (!proto) {
+		error = "INVALID_PROTO";
+		goto error;
+	}
+
+	state = proto->attach(proto, iface);
+
+error:
+	if (error) {
+		interface_add_error(iface, "proto", error, NULL, 0);
+		state = get_default_proto();
+		state->handler = invalid_proto_handler;
+	}
+
+out:
+	interface_set_proto_state(iface, state);
+}
+
+
 int interface_proto_event(struct interface_proto_state *proto,
 			  enum interface_proto_cmd cmd, bool force)
 {