3 #include <sys/socket.h>
6 #include <libubox/blob.h>
7 #include <libubox/blobmsg.h>
8 #include <libubox/usock.h>
16 #define DPRINTF(_format, ...) fprintf(stderr, "ubus: " _format, ## __VA_ARGS__)
18 #define DPRINTF(...) do {} while(0)
21 #define STATIC_IOV(_var) { .iov_base = (char *) &(_var), .iov_len = sizeof(_var) }
23 const char *__ubus_strerror[__UBUS_STATUS_LAST] = {
24 [UBUS_STATUS_OK] = "Success",
25 [UBUS_STATUS_INVALID_COMMAND] = "Invalid command",
26 [UBUS_STATUS_INVALID_ARGUMENT] = "Invalid argument",
27 [UBUS_STATUS_NOT_FOUND] = "Not found",
28 [UBUS_STATUS_NO_DATA] = "No response",
31 static struct blob_buf b;
33 static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
34 [UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
35 [UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
36 [UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
38 static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
40 struct ubus_pending_data {
41 struct list_head list;
43 struct blob_attr data[];
46 struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
48 blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
52 const char *ubus_strerror(int error)
56 if (error < 0 || error >= __UBUS_STATUS_LAST)
59 if (!__ubus_strerror[error])
62 return __ubus_strerror[error];
65 sprintf(err, "Unknown error: %d", error);
69 int ubus_start_request(struct ubus_context *ctx, struct ubus_request *req,
70 struct blob_attr *msg, int cmd, uint32_t peer)
72 struct ubus_msghdr hdr;
73 struct iovec iov[2] = {
77 memset(req, 0, sizeof(*req));
80 hdr.seq = ++ctx->request_seq;
91 iov[1].iov_base = (char *) msg;
92 iov[1].iov_len = blob_raw_len(msg);
93 INIT_LIST_HEAD(&req->list);
94 INIT_LIST_HEAD(&req->pending);
96 return writev(ctx->sock.fd, iov, 2);
99 static bool recv_retry(int fd, struct iovec *iov, bool wait)
103 while (iov->iov_len > 0) {
104 bytes = read(fd, iov->iov_base, iov->iov_len);
110 if (errno != EAGAIN) {
119 iov->iov_len -= bytes;
120 iov->iov_base += bytes;
126 static bool ubus_validate_hdr(struct ubus_msghdr *hdr)
128 if (hdr->version != 0)
131 if (blob_raw_len(hdr->data) < sizeof(*hdr->data))
134 if (blob_raw_len(hdr->data) + sizeof(*hdr) > UBUS_MAX_MSGLEN)
140 static bool get_next_msg(struct ubus_context *ctx, bool wait)
142 struct iovec iov = STATIC_IOV(ctx->msgbuf.hdr);
144 /* receive header + start attribute */
145 iov.iov_len += sizeof(struct blob_attr);
146 if (!recv_retry(ctx->sock.fd, &iov, wait))
149 iov.iov_len = blob_len(ctx->msgbuf.hdr.data);
150 if (iov.iov_len > 0 && !recv_retry(ctx->sock.fd, &iov, true))
153 return ubus_validate_hdr(&ctx->msgbuf.hdr);
156 static bool ubus_get_status(struct ubus_msghdr *hdr, int *ret)
158 ubus_parse_msg(hdr->data);
160 if (!attrbuf[UBUS_ATTR_STATUS])
163 *ret = blob_get_int32(attrbuf[UBUS_ATTR_STATUS]);
167 static void ubus_process_req_data(struct ubus_request *req)
169 struct ubus_pending_data *data;
171 while (!list_empty(&req->pending)) {
172 data = list_first_entry(&req->pending,
173 struct ubus_pending_data, list);
174 list_del(&data->list);
175 req->data_cb(req, data->type, data->data);
180 static void ubus_req_complete_cb(struct ubus_request *req)
182 ubus_complete_handler_t cb = req->complete_cb;
187 req->complete_cb = NULL;
188 cb(req, req->status_code);
191 static int ubus_process_req_status(struct ubus_request *req, struct ubus_msghdr *hdr)
193 int ret = UBUS_STATUS_INVALID_ARGUMENT;
195 if (!list_empty(&req->list))
196 list_del(&req->list);
198 ubus_get_status(hdr, &ret);
199 req->peer = hdr->peer;
200 req->status_msg = true;
201 req->status_code = ret;
203 ubus_req_complete_cb(req);
208 static void ubus_req_data(struct ubus_request *req, struct ubus_msghdr *hdr)
210 struct ubus_pending_data *data;
215 req->data_cb(req, hdr->type, hdr->data);
216 ubus_process_req_data(req);
217 req->blocked = false;
220 ubus_req_complete_cb(req);
225 len = blob_raw_len(hdr->data);
226 data = calloc(1, sizeof(*data) + len);
230 data->type = hdr->type;
231 memcpy(data->data, hdr->data, len);
232 list_add(&data->list, &req->pending);
235 static void ubus_process_msg(struct ubus_context *ctx, struct ubus_msghdr *hdr)
237 struct ubus_request *req;
239 list_for_each_entry(req, &ctx->requests, list) {
240 if (hdr->seq != req->seq || hdr->peer != req->peer)
244 case UBUS_MSG_STATUS:
245 ubus_process_req_status(req, hdr);
249 ubus_req_data(req, hdr);
252 DPRINTF("unknown message type: %d\n", hdr->type);
258 void ubus_abort_request(struct ubus_context *ctx, struct ubus_request *req)
260 if (!list_empty(&req->list))
263 list_del(&req->list);
266 void ubus_complete_request_async(struct ubus_context *ctx, struct ubus_request *req)
268 if (!list_empty(&req->list))
271 list_add(&req->list, &ctx->requests);
274 static void ubus_handle_data(struct uloop_fd *u, unsigned int events)
276 struct ubus_context *ctx = container_of(u, struct ubus_context, sock);
277 struct ubus_msghdr *hdr = &ctx->msgbuf.hdr;
279 while (get_next_msg(ctx, false))
280 ubus_process_msg(ctx, hdr);
283 int ubus_complete_request(struct ubus_context *ctx, struct ubus_request *req)
285 struct ubus_msghdr *hdr = &ctx->msgbuf.hdr;
287 if (!list_empty(&req->list))
288 list_del(&req->list);
292 return req->status_code;
294 if (!get_next_msg(ctx, true))
295 return UBUS_STATUS_NO_DATA;
297 if (hdr->seq != req->seq || hdr->peer != req->peer)
301 case UBUS_MSG_STATUS:
302 return ubus_process_req_status(req, hdr);
305 ubus_req_data(req, hdr);
308 DPRINTF("unknown message type: %d\n", hdr->type);
313 ubus_process_msg(ctx, hdr);
317 void ubus_invoke_async(struct ubus_context *ctx, uint32_t obj, const char *method,
318 struct blob_attr *msg, struct ubus_request *req)
320 blob_buf_init(&b, 0);
321 blob_put_int32(&b, UBUS_ATTR_OBJID, obj);
322 blob_put_string(&b, UBUS_ATTR_METHOD, method);
323 blob_put(&b, UBUS_ATTR_DATA, blob_data(msg), blob_len(msg));
325 ubus_start_request(ctx, req, b.head, UBUS_MSG_INVOKE, obj);
328 int ubus_invoke(struct ubus_context *ctx, uint32_t obj, const char *method,
329 struct blob_attr *msg, ubus_data_handler_t cb, void *priv)
331 struct ubus_request req;
333 ubus_invoke_async(ctx, obj, method, msg, &req);
336 return ubus_complete_request(ctx, &req);
339 static void ubus_publish_cb(struct ubus_request *req, int type, struct blob_attr *msg)
341 struct ubus_object *obj = req->priv;
345 if (!attrbuf[UBUS_ATTR_OBJID])
348 obj->id = blob_get_int32(attrbuf[UBUS_ATTR_OBJID]);
350 if (attrbuf[UBUS_ATTR_OBJTYPE])
351 obj->type->id = blob_get_int32(attrbuf[UBUS_ATTR_OBJTYPE]);
354 static bool ubus_push_table_data(const struct ubus_signature **sig, int *rem, bool array)
356 const struct ubus_signature *cur;
364 case UBUS_SIGNATURE_END:
366 case BLOBMSG_TYPE_INT32:
367 case BLOBMSG_TYPE_STRING:
368 blobmsg_add_u32(&b, cur->name, cur->type);
370 case BLOBMSG_TYPE_TABLE:
371 case BLOBMSG_TYPE_ARRAY:
372 nest_type = cur->type == BLOBMSG_TYPE_ARRAY;
373 nest = blobmsg_open_nested(&b, cur->name, nest_type);
374 if (!ubus_push_table_data(sig, rem, nest_type))
376 blobmsg_close_table(&b, nest);
387 static bool ubus_push_object_type(struct ubus_object_type *type)
390 int rem = type->n_signature;
391 const struct ubus_signature *sig = type->signature;
393 s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
395 if (sig->type != UBUS_SIGNATURE_METHOD)
398 m = blobmsg_open_table(&b, sig->name);
402 if (!ubus_push_table_data(&sig, &rem, false))
405 blobmsg_close_table(&b, m);
407 blob_nest_end(&b, s);
412 int ubus_publish(struct ubus_context *ctx, struct ubus_object *obj)
414 struct ubus_request req;
417 if (obj->id || !obj->name || !obj->type)
418 return UBUS_STATUS_INVALID_ARGUMENT;
420 blob_buf_init(&b, 0);
421 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
423 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->parent->id);
426 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
427 else if (!ubus_push_object_type(obj->type))
428 return UBUS_STATUS_INVALID_ARGUMENT;
430 ubus_start_request(ctx, &req, b.head, UBUS_MSG_PUBLISH, 0);
431 req.data_cb = ubus_publish_cb;
433 ret = ubus_complete_request(ctx, &req);
438 return UBUS_STATUS_NO_DATA;
443 struct ubus_context *ubus_connect(const char *path)
445 struct ubus_context *ctx;
447 struct ubus_msghdr hdr;
448 struct blob_attr data;
450 struct blob_attr *buf;
453 path = UBUS_UNIX_SOCKET;
455 ctx = calloc(1, sizeof(*ctx));
459 ctx->sock.fd = usock(USOCK_UNIX, path, NULL);
460 if (ctx->sock.fd < 0) {
461 DPRINTF("Failed to connect to server\n");
464 ctx->sock.cb = ubus_handle_data;
466 if (read(ctx->sock.fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
467 DPRINTF("Failed to read initial message data\n");
471 if (!ubus_validate_hdr(&hdr.hdr)) {
472 DPRINTF("Failed to validate initial message header\n");
476 if (hdr.hdr.type != UBUS_MSG_HELLO) {
477 DPRINTF("Unexpected initial message\n");
481 buf = calloc(1, blob_raw_len(&hdr.data));
485 memcpy(buf, &hdr.data, sizeof(hdr.data));
486 if (read(ctx->sock.fd, blob_data(buf), blob_len(buf)) != blob_len(buf)) {
487 DPRINTF("Failed to retrieve initial message data\n");
491 ctx->local_id = hdr.hdr.peer;
494 if (!ctx->local_id) {
495 DPRINTF("Failed to get local peer id\n");
511 void ubus_free(struct ubus_context *ctx)