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- #include <arpa/inet.h>
- #include "ubusd.h"
- static struct blob_buf b;
- static struct ubus_msg_buf *retmsg;
- static int *retmsg_data;
- static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
- typedef int (*ubus_cmd_cb)(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr);
- static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
- [UBUS_ATTR_SIGNATURE] = { .type = BLOB_ATTR_NESTED },
- [UBUS_ATTR_OBJTYPE] = { .type = BLOB_ATTR_INT32 },
- [UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
- [UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
- [UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
- };
- struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
- {
- blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
- return attrbuf;
- }
- static void ubus_msg_init(struct ubus_msg_buf *ub, uint8_t type, uint16_t seq, uint32_t peer)
- {
- ub->hdr.version = 0;
- ub->hdr.type = type;
- ub->hdr.seq = seq;
- ub->hdr.peer = peer;
- }
- static struct ubus_msg_buf *ubus_msg_from_blob(bool shared)
- {
- return ubus_msg_new(b.head, blob_raw_len(b.head), shared);
- }
- static struct ubus_msg_buf *ubus_reply_from_blob(struct ubus_msg_buf *ub, bool shared)
- {
- struct ubus_msg_buf *new;
- new = ubus_msg_new(b.head, blob_raw_len(b.head), shared);
- if (!new)
- return NULL;
- ubus_msg_init(new, UBUS_MSG_DATA, ub->hdr.seq, ub->hdr.peer);
- return new;
- }
- bool ubusd_send_hello(struct ubus_client *cl)
- {
- struct ubus_msg_buf *ub;
- blob_buf_init(&b, 0);
- ub = ubus_msg_from_blob(true);
- if (!ub)
- return false;
- ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
- ubus_msg_send(cl, ub, true);
- return true;
- }
- static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
- {
- ub->hdr.type = UBUS_MSG_DATA;
- ubus_msg_send(cl, ub, false);
- return 0;
- }
- static int ubusd_handle_add_object(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
- {
- struct ubus_object *obj;
- obj = ubusd_create_object(cl, attr);
- if (!obj)
- return UBUS_STATUS_INVALID_ARGUMENT;
- blob_buf_init(&b, 0);
- blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
- if (attr[UBUS_ATTR_SIGNATURE])
- blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
- ub = ubus_reply_from_blob(ub, true);
- if (!ub)
- return UBUS_STATUS_NO_DATA;
- ubus_msg_send(cl, ub, true);
- return 0;
- }
- static void ubusd_send_obj(struct ubus_client *cl, struct ubus_msg_buf *ub, struct ubus_object *obj)
- {
- struct ubus_method *m;
- void *s;
- blob_buf_init(&b, 0);
- if (obj->path.key)
- blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->path.key);
- blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
- blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
- s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
- list_for_each_entry(m, &obj->type->methods, list)
- blob_put(&b, blob_id(m->data), blob_data(m->data), blob_len(m->data));
- blob_nest_end(&b, s);
- ub = ubus_reply_from_blob(ub, true);
- if (!ub)
- return;
- ubus_msg_send(cl, ub, true);
- }
- static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
- {
- struct ubus_object *obj;
- char *objpath;
- bool wildcard = false;
- bool found = false;
- int len;
- if (!attr[UBUS_ATTR_OBJPATH]) {
- avl_for_each_element(&path, obj, path)
- ubusd_send_obj(cl, ub, obj);
- return 0;
- }
- objpath = blob_data(attr[UBUS_ATTR_OBJPATH]);
- len = strlen(objpath);
- if (objpath[len - 1] != '*') {
- obj = avl_find_element(&path, objpath, obj, path);
- if (!obj)
- return UBUS_STATUS_NOT_FOUND;
- ubusd_send_obj(cl, ub, obj);
- return 0;
- }
- objpath[--len] = 0;
- wildcard = true;
- obj = avl_find_ge_element(&path, objpath, obj, path);
- if (!obj)
- return UBUS_STATUS_NOT_FOUND;
- while (!strncmp(objpath, obj->path.key, len)) {
- found = true;
- ubusd_send_obj(cl, ub, obj);
- if (obj == avl_last_element(&path, obj, path))
- break;
- obj = avl_next_element(obj, path);
- }
- if (!found)
- return UBUS_STATUS_NOT_FOUND;
- return 0;
- }
- static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
- {
- struct ubus_object *obj = NULL;
- struct ubus_id *id;
- const char *method;
- if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
- return UBUS_STATUS_INVALID_ARGUMENT;
- id = ubus_find_id(&objects, blob_get_int32(attr[UBUS_ATTR_OBJID]));
- if (!id)
- return UBUS_STATUS_NOT_FOUND;
- obj = container_of(id, struct ubus_object, id);
- method = blob_data(attr[UBUS_ATTR_METHOD]);
- if (!obj->client)
- return obj->recv_msg(cl, method, attr[UBUS_ATTR_DATA]);
- blob_buf_init(&b, 0);
- blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
- blob_put_string(&b, UBUS_ATTR_METHOD, method);
- if (attr[UBUS_ATTR_DATA])
- blob_put(&b, UBUS_ATTR_DATA, blob_data(attr[UBUS_ATTR_DATA]),
- blob_len(attr[UBUS_ATTR_DATA]));
- ubus_msg_free(ub);
- ub = ubus_reply_from_blob(ub, true);
- if (!ub)
- return UBUS_STATUS_NO_DATA;
- ub->hdr.type = UBUS_MSG_INVOKE;
- ub->hdr.peer = cl->id.id;
- ubus_msg_send(obj->client, ub, true);
- return -1;
- }
- static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
- {
- struct ubus_object *obj;
- if (!attr[UBUS_ATTR_OBJID] ||
- (ub->hdr.type == UBUS_MSG_STATUS && !attr[UBUS_ATTR_STATUS]) ||
- (ub->hdr.type == UBUS_MSG_DATA && !attr[UBUS_ATTR_DATA]))
- goto error;
- obj = ubusd_find_object(blob_get_int32(attr[UBUS_ATTR_OBJID]));
- if (!obj)
- goto error;
- if (cl != obj->client)
- goto error;
- cl = ubusd_get_client_by_id(ub->hdr.peer);
- if (!cl)
- goto error;
- ub->hdr.peer = blob_get_int32(attr[UBUS_ATTR_OBJID]);
- ubus_msg_send(cl, ub, true);
- return -1;
- error:
- ubus_msg_free(ub);
- return -1;
- }
- static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
- [UBUS_MSG_PING] = ubusd_send_pong,
- [UBUS_MSG_ADD_OBJECT] = ubusd_handle_add_object,
- [UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
- [UBUS_MSG_INVOKE] = ubusd_handle_invoke,
- [UBUS_MSG_STATUS] = ubusd_handle_response,
- [UBUS_MSG_DATA] = ubusd_handle_response,
- };
- void ubusd_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
- {
- ubus_cmd_cb cb = NULL;
- int ret;
- retmsg->hdr.seq = ub->hdr.seq;
- retmsg->hdr.peer = ub->hdr.peer;
- if (ub->hdr.type < __UBUS_MSG_LAST)
- cb = handlers[ub->hdr.type];
- if (cb)
- ret = cb(cl, ub, ubus_parse_msg(ub->data));
- else
- ret = UBUS_STATUS_INVALID_COMMAND;
- if (ret == -1)
- return;
- ubus_msg_free(ub);
- *retmsg_data = htonl(ret);
- ubus_msg_send(cl, retmsg, false);
- }
- static void __init ubusd_proto_init(void)
- {
- blob_buf_init(&b, 0);
- blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
- retmsg = ubus_msg_from_blob(false);
- if (!retmsg)
- exit(1);
- retmsg->hdr.type = UBUS_MSG_STATUS;
- retmsg_data = blob_data(blob_data(retmsg->data));
- }
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