ubus: Support static builds
[project/ubus.git] / libubus.c
1 /*
2 * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <sys/types.h>
15 #include <sys/socket.h>
16 #include <unistd.h>
17
18 #include <libubox/blob.h>
19 #include <libubox/blobmsg.h>
20
21 #include "libubus.h"
22 #include "libubus-internal.h"
23 #include "ubusmsg.h"
24
25 const char *__ubus_strerror[__UBUS_STATUS_LAST] = {
26 [UBUS_STATUS_OK] = "Success",
27 [UBUS_STATUS_INVALID_COMMAND] = "Invalid command",
28 [UBUS_STATUS_INVALID_ARGUMENT] = "Invalid argument",
29 [UBUS_STATUS_METHOD_NOT_FOUND] = "Method not found",
30 [UBUS_STATUS_NOT_FOUND] = "Not found",
31 [UBUS_STATUS_NO_DATA] = "No response",
32 [UBUS_STATUS_PERMISSION_DENIED] = "Permission denied",
33 [UBUS_STATUS_TIMEOUT] = "Request timed out",
34 [UBUS_STATUS_NOT_SUPPORTED] = "Operation not supported",
35 [UBUS_STATUS_UNKNOWN_ERROR] = "Unknown error",
36 [UBUS_STATUS_CONNECTION_FAILED] = "Connection failed",
37 };
38
39 struct blob_buf b __hidden = {};
40
41 struct ubus_pending_msg {
42 struct list_head list;
43 struct ubus_msghdr_buf hdr;
44 };
45
46 static int ubus_cmp_id(const void *k1, const void *k2, void *ptr)
47 {
48 const uint32_t *id1 = k1, *id2 = k2;
49
50 if (*id1 < *id2)
51 return -1;
52 else
53 return *id1 > *id2;
54 }
55
56 const char *ubus_strerror(int error)
57 {
58 static char err[32];
59
60 if (error < 0 || error >= __UBUS_STATUS_LAST)
61 goto out;
62
63 if (!__ubus_strerror[error])
64 goto out;
65
66 return __ubus_strerror[error];
67
68 out:
69 sprintf(err, "Unknown error: %d", error);
70 return err;
71 }
72
73 static void
74 ubus_queue_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf)
75 {
76 struct ubus_pending_msg *pending;
77 void *data;
78
79 pending = calloc_a(sizeof(*pending), &data, blob_raw_len(buf->data));
80
81 pending->hdr.data = data;
82 memcpy(&pending->hdr.hdr, &buf->hdr, sizeof(buf->hdr));
83 memcpy(data, buf->data, blob_raw_len(buf->data));
84 list_add_tail(&pending->list, &ctx->pending);
85 if (ctx->sock.registered)
86 uloop_timeout_set(&ctx->pending_timer, 1);
87 }
88
89 void __hidden
90 ubus_process_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf, int fd)
91 {
92 switch(buf->hdr.type) {
93 case UBUS_MSG_STATUS:
94 case UBUS_MSG_DATA:
95 ubus_process_req_msg(ctx, buf, fd);
96 break;
97
98 case UBUS_MSG_INVOKE:
99 case UBUS_MSG_UNSUBSCRIBE:
100 case UBUS_MSG_NOTIFY:
101 if (ctx->stack_depth) {
102 ubus_queue_msg(ctx, buf);
103 break;
104 }
105
106 ubus_process_obj_msg(ctx, buf, fd);
107 break;
108 case UBUS_MSG_MONITOR:
109 if (ctx->monitor_cb)
110 ctx->monitor_cb(ctx, buf->hdr.seq, buf->data);
111 break;
112 }
113 }
114
115 static void ubus_process_pending_msg(struct uloop_timeout *timeout)
116 {
117 struct ubus_context *ctx = container_of(timeout, struct ubus_context, pending_timer);
118 struct ubus_pending_msg *pending;
119
120 while (!ctx->stack_depth && !list_empty(&ctx->pending)) {
121 pending = list_first_entry(&ctx->pending, struct ubus_pending_msg, list);
122 list_del(&pending->list);
123 ubus_process_msg(ctx, &pending->hdr, -1);
124 free(pending);
125 }
126 }
127
128 struct ubus_lookup_request {
129 struct ubus_request req;
130 ubus_lookup_handler_t cb;
131 };
132
133 static void ubus_lookup_cb(struct ubus_request *ureq, int type, struct blob_attr *msg)
134 {
135 struct ubus_lookup_request *req;
136 struct ubus_object_data obj = {};
137 struct blob_attr **attr;
138
139 req = container_of(ureq, struct ubus_lookup_request, req);
140 attr = ubus_parse_msg(msg);
141
142 if (!attr[UBUS_ATTR_OBJID] || !attr[UBUS_ATTR_OBJPATH] ||
143 !attr[UBUS_ATTR_OBJTYPE])
144 return;
145
146 obj.id = blob_get_u32(attr[UBUS_ATTR_OBJID]);
147 obj.path = blob_data(attr[UBUS_ATTR_OBJPATH]);
148 obj.type_id = blob_get_u32(attr[UBUS_ATTR_OBJTYPE]);
149 obj.signature = attr[UBUS_ATTR_SIGNATURE];
150 req->cb(ureq->ctx, &obj, ureq->priv);
151 }
152
153 int ubus_lookup(struct ubus_context *ctx, const char *path,
154 ubus_lookup_handler_t cb, void *priv)
155 {
156 struct ubus_lookup_request lookup;
157
158 blob_buf_init(&b, 0);
159 if (path)
160 blob_put_string(&b, UBUS_ATTR_OBJPATH, path);
161
162 if (ubus_start_request(ctx, &lookup.req, b.head, UBUS_MSG_LOOKUP, 0) < 0)
163 return UBUS_STATUS_INVALID_ARGUMENT;
164
165 lookup.req.raw_data_cb = ubus_lookup_cb;
166 lookup.req.priv = priv;
167 lookup.cb = cb;
168 return ubus_complete_request(ctx, &lookup.req, 0);
169 }
170
171 static void ubus_lookup_id_cb(struct ubus_request *req, int type, struct blob_attr *msg)
172 {
173 struct blob_attr **attr;
174 uint32_t *id = req->priv;
175
176 attr = ubus_parse_msg(msg);
177
178 if (!attr[UBUS_ATTR_OBJID])
179 return;
180
181 *id = blob_get_u32(attr[UBUS_ATTR_OBJID]);
182 }
183
184 int ubus_lookup_id(struct ubus_context *ctx, const char *path, uint32_t *id)
185 {
186 struct ubus_request req;
187
188 blob_buf_init(&b, 0);
189 if (path)
190 blob_put_string(&b, UBUS_ATTR_OBJPATH, path);
191
192 if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_LOOKUP, 0) < 0)
193 return UBUS_STATUS_INVALID_ARGUMENT;
194
195 req.raw_data_cb = ubus_lookup_id_cb;
196 req.priv = id;
197
198 return ubus_complete_request(ctx, &req, 0);
199 }
200
201 static int ubus_event_cb(struct ubus_context *ctx, struct ubus_object *obj,
202 struct ubus_request_data *req,
203 const char *method, struct blob_attr *msg)
204 {
205 struct ubus_event_handler *ev;
206
207 ev = container_of(obj, struct ubus_event_handler, obj);
208 ev->cb(ctx, ev, method, msg);
209 return 0;
210 }
211
212 static const struct ubus_method event_method = {
213 .name = NULL,
214 .handler = ubus_event_cb,
215 };
216
217 int ubus_register_event_handler(struct ubus_context *ctx,
218 struct ubus_event_handler *ev,
219 const char *pattern)
220 {
221 struct ubus_object *obj = &ev->obj;
222 struct blob_buf b2 = {};
223 int ret;
224
225 if (!obj->id) {
226 obj->methods = &event_method;
227 obj->n_methods = 1;
228
229 if (!!obj->name ^ !!obj->type)
230 return UBUS_STATUS_INVALID_ARGUMENT;
231
232 ret = ubus_add_object(ctx, obj);
233 if (ret)
234 return ret;
235 }
236
237 /* use a second buffer, ubus_invoke() overwrites the primary one */
238 blob_buf_init(&b2, 0);
239 blobmsg_add_u32(&b2, "object", obj->id);
240 if (pattern)
241 blobmsg_add_string(&b2, "pattern", pattern);
242
243 ret = ubus_invoke(ctx, UBUS_SYSTEM_OBJECT_EVENT, "register", b2.head,
244 NULL, NULL, 0);
245 blob_buf_free(&b2);
246
247 return ret;
248 }
249
250 int ubus_send_event(struct ubus_context *ctx, const char *id,
251 struct blob_attr *data)
252 {
253 struct ubus_request req;
254 void *s;
255
256 blob_buf_init(&b, 0);
257 blob_put_int32(&b, UBUS_ATTR_OBJID, UBUS_SYSTEM_OBJECT_EVENT);
258 blob_put_string(&b, UBUS_ATTR_METHOD, "send");
259 s = blob_nest_start(&b, UBUS_ATTR_DATA);
260 blobmsg_add_string(&b, "id", id);
261 blobmsg_add_field(&b, BLOBMSG_TYPE_TABLE, "data", blob_data(data), blob_len(data));
262 blob_nest_end(&b, s);
263
264 if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_INVOKE, UBUS_SYSTEM_OBJECT_EVENT) < 0)
265 return UBUS_STATUS_INVALID_ARGUMENT;
266
267 return ubus_complete_request(ctx, &req, 0);
268 }
269
270 static void ubus_default_connection_lost(struct ubus_context *ctx)
271 {
272 if (ctx->sock.registered)
273 uloop_end();
274 }
275
276 int ubus_connect_ctx(struct ubus_context *ctx, const char *path)
277 {
278 uloop_init();
279 memset(ctx, 0, sizeof(*ctx));
280
281 ctx->sock.fd = -1;
282 ctx->sock.cb = ubus_handle_data;
283 ctx->connection_lost = ubus_default_connection_lost;
284 ctx->pending_timer.cb = ubus_process_pending_msg;
285
286 ctx->msgbuf.data = calloc(UBUS_MSG_CHUNK_SIZE, sizeof(char));
287 if (!ctx->msgbuf.data)
288 return -1;
289 ctx->msgbuf_data_len = UBUS_MSG_CHUNK_SIZE;
290
291 INIT_LIST_HEAD(&ctx->requests);
292 INIT_LIST_HEAD(&ctx->pending);
293 avl_init(&ctx->objects, ubus_cmp_id, false, NULL);
294 if (ubus_reconnect(ctx, path)) {
295 free(ctx->msgbuf.data);
296 ctx->msgbuf.data = NULL;
297 return -1;
298 }
299
300 return 0;
301 }
302
303 static void ubus_auto_reconnect_cb(struct uloop_timeout *timeout)
304 {
305 struct ubus_auto_conn *conn = container_of(timeout, struct ubus_auto_conn, timer);
306
307 if (!ubus_reconnect(&conn->ctx, conn->path))
308 ubus_add_uloop(&conn->ctx);
309 else
310 uloop_timeout_set(timeout, 1000);
311 }
312
313 static void ubus_auto_disconnect_cb(struct ubus_context *ctx)
314 {
315 struct ubus_auto_conn *conn = container_of(ctx, struct ubus_auto_conn, ctx);
316
317 conn->timer.cb = ubus_auto_reconnect_cb;
318 uloop_timeout_set(&conn->timer, 1000);
319 }
320
321 static void ubus_auto_connect_cb(struct uloop_timeout *timeout)
322 {
323 struct ubus_auto_conn *conn = container_of(timeout, struct ubus_auto_conn, timer);
324
325 if (ubus_connect_ctx(&conn->ctx, conn->path)) {
326 uloop_timeout_set(timeout, 1000);
327 fprintf(stderr, "failed to connect to ubus\n");
328 return;
329 }
330 conn->ctx.connection_lost = ubus_auto_disconnect_cb;
331 if (conn->cb)
332 conn->cb(&conn->ctx);
333 ubus_add_uloop(&conn->ctx);
334 }
335
336 void ubus_auto_connect(struct ubus_auto_conn *conn)
337 {
338 conn->timer.cb = ubus_auto_connect_cb;
339 ubus_auto_connect_cb(&conn->timer);
340 }
341
342 struct ubus_context *ubus_connect(const char *path)
343 {
344 struct ubus_context *ctx;
345
346 ctx = calloc(1, sizeof(*ctx));
347 if (!ctx)
348 return NULL;
349
350 if (ubus_connect_ctx(ctx, path)) {
351 free(ctx);
352 ctx = NULL;
353 }
354
355 return ctx;
356 }
357
358 void ubus_shutdown(struct ubus_context *ctx)
359 {
360 blob_buf_free(&b);
361 if (!ctx)
362 return;
363 close(ctx->sock.fd);
364 uloop_timeout_cancel(&ctx->pending_timer);
365 free(ctx->msgbuf.data);
366 }
367
368 void ubus_free(struct ubus_context *ctx)
369 {
370 ubus_shutdown(ctx);
371 free(ctx);
372 }