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Sources/ubus/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, *tmp;
119 
120         list_for_each_entry_safe(pending, tmp, &ctx->pending, list) {
121                 if (ctx->stack_depth)
122                         break;
123 
124                 list_del(&pending->list);
125                 ubus_process_msg(ctx, &pending->hdr, -1);
126                 free(pending);
127         }
128 }
129 
130 struct ubus_lookup_request {
131         struct ubus_request req;
132         ubus_lookup_handler_t cb;
133 };
134 
135 static void ubus_lookup_cb(struct ubus_request *ureq, int type, struct blob_attr *msg)
136 {
137         struct ubus_lookup_request *req;
138         struct ubus_object_data obj = {};
139         struct blob_attr **attr;
140 
141         req = container_of(ureq, struct ubus_lookup_request, req);
142         attr = ubus_parse_msg(msg, blob_raw_len(msg));
143 
144         if (!attr[UBUS_ATTR_OBJID] || !attr[UBUS_ATTR_OBJPATH] ||
145             !attr[UBUS_ATTR_OBJTYPE])
146                 return;
147 
148         obj.id = blob_get_u32(attr[UBUS_ATTR_OBJID]);
149         obj.path = blob_data(attr[UBUS_ATTR_OBJPATH]);
150         obj.type_id = blob_get_u32(attr[UBUS_ATTR_OBJTYPE]);
151         obj.signature = attr[UBUS_ATTR_SIGNATURE];
152         req->cb(ureq->ctx, &obj, ureq->priv);
153 }
154 
155 int ubus_lookup(struct ubus_context *ctx, const char *path,
156                 ubus_lookup_handler_t cb, void *priv)
157 {
158         struct ubus_lookup_request lookup;
159 
160         blob_buf_init(&b, 0);
161         if (path)
162                 blob_put_string(&b, UBUS_ATTR_OBJPATH, path);
163 
164         if (ubus_start_request(ctx, &lookup.req, b.head, UBUS_MSG_LOOKUP, 0) < 0)
165                 return UBUS_STATUS_INVALID_ARGUMENT;
166 
167         lookup.req.raw_data_cb = ubus_lookup_cb;
168         lookup.req.priv = priv;
169         lookup.cb = cb;
170         return ubus_complete_request(ctx, &lookup.req, 0);
171 }
172 
173 static void ubus_lookup_id_cb(struct ubus_request *req, int type, struct blob_attr *msg)
174 {
175         struct blob_attr **attr;
176         uint32_t *id = req->priv;
177 
178         attr = ubus_parse_msg(msg, blob_raw_len(msg));
179 
180         if (!attr[UBUS_ATTR_OBJID])
181                 return;
182 
183         *id = blob_get_u32(attr[UBUS_ATTR_OBJID]);
184 }
185 
186 int ubus_lookup_id(struct ubus_context *ctx, const char *path, uint32_t *id)
187 {
188         struct ubus_request req;
189 
190         blob_buf_init(&b, 0);
191         if (path)
192                 blob_put_string(&b, UBUS_ATTR_OBJPATH, path);
193 
194         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_LOOKUP, 0) < 0)
195                 return UBUS_STATUS_INVALID_ARGUMENT;
196 
197         req.raw_data_cb = ubus_lookup_id_cb;
198         req.priv = id;
199 
200         return ubus_complete_request(ctx, &req, 0);
201 }
202 
203 static int ubus_event_cb(struct ubus_context *ctx, struct ubus_object *obj,
204                          struct ubus_request_data *req,
205                          const char *method, struct blob_attr *msg)
206 {
207         struct ubus_event_handler *ev;
208 
209         ev = container_of(obj, struct ubus_event_handler, obj);
210         ev->cb(ctx, ev, method, msg);
211         return 0;
212 }
213 
214 static const struct ubus_method event_method = {
215         .name = NULL,
216         .handler = ubus_event_cb,
217 };
218 
219 int ubus_register_event_handler(struct ubus_context *ctx,
220                                 struct ubus_event_handler *ev,
221                                 const char *pattern)
222 {
223         struct ubus_object *obj = &ev->obj;
224         struct blob_buf b2 = {};
225         int ret;
226 
227         if (!obj->id) {
228                 obj->methods = &event_method;
229                 obj->n_methods = 1;
230 
231                 if (!!obj->name ^ !!obj->type)
232                         return UBUS_STATUS_INVALID_ARGUMENT;
233 
234                 ret = ubus_add_object(ctx, obj);
235                 if (ret)
236                         return ret;
237         }
238 
239         /* use a second buffer, ubus_invoke() overwrites the primary one */
240         blob_buf_init(&b2, 0);
241         blobmsg_add_u32(&b2, "object", obj->id);
242         if (pattern)
243                 blobmsg_add_string(&b2, "pattern", pattern);
244 
245         ret = ubus_invoke(ctx, UBUS_SYSTEM_OBJECT_EVENT, "register", b2.head,
246                           NULL, NULL, 0);
247         blob_buf_free(&b2);
248 
249         return ret;
250 }
251 
252 int ubus_send_event(struct ubus_context *ctx, const char *id,
253                     struct blob_attr *data)
254 {
255         struct ubus_request req;
256         void *s;
257 
258         blob_buf_init(&b, 0);
259         blob_put_int32(&b, UBUS_ATTR_OBJID, UBUS_SYSTEM_OBJECT_EVENT);
260         blob_put_string(&b, UBUS_ATTR_METHOD, "send");
261         s = blob_nest_start(&b, UBUS_ATTR_DATA);
262         blobmsg_add_string(&b, "id", id);
263         blobmsg_add_field(&b, BLOBMSG_TYPE_TABLE, "data", blob_data(data), blob_len(data));
264         blob_nest_end(&b, s);
265 
266         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_INVOKE, UBUS_SYSTEM_OBJECT_EVENT) < 0)
267                 return UBUS_STATUS_INVALID_ARGUMENT;
268 
269         return ubus_complete_request(ctx, &req, 0);
270 }
271 
272 static void ubus_default_connection_lost(struct ubus_context *ctx)
273 {
274         if (ctx->sock.registered)
275                 uloop_end();
276 }
277 
278 int ubus_connect_ctx(struct ubus_context *ctx, const char *path)
279 {
280         uloop_init();
281         memset(ctx, 0, sizeof(*ctx));
282 
283         ctx->sock.fd = -1;
284         ctx->sock.cb = ubus_handle_data;
285         ctx->connection_lost = ubus_default_connection_lost;
286         ctx->pending_timer.cb = ubus_process_pending_msg;
287 
288         ctx->msgbuf.data = calloc(1, UBUS_MSG_CHUNK_SIZE);
289         if (!ctx->msgbuf.data)
290                 return -1;
291         ctx->msgbuf_data_len = UBUS_MSG_CHUNK_SIZE;
292 
293         INIT_LIST_HEAD(&ctx->requests);
294         INIT_LIST_HEAD(&ctx->pending);
295         avl_init(&ctx->objects, ubus_cmp_id, false, NULL);
296         if (ubus_reconnect(ctx, path)) {
297                 free(ctx->msgbuf.data);
298                 ctx->msgbuf.data = NULL;
299                 return -1;
300         }
301 
302         return 0;
303 }
304 
305 static void ubus_auto_reconnect_cb(struct uloop_timeout *timeout)
306 {
307         struct ubus_auto_conn *conn = container_of(timeout, struct ubus_auto_conn, timer);
308 
309         if (!ubus_reconnect(&conn->ctx, conn->path))
310                 ubus_add_uloop(&conn->ctx);
311         else
312                 uloop_timeout_set(timeout, 1000);
313 }
314 
315 static void ubus_auto_disconnect_cb(struct ubus_context *ctx)
316 {
317         struct ubus_auto_conn *conn = container_of(ctx, struct ubus_auto_conn, ctx);
318 
319         conn->timer.cb = ubus_auto_reconnect_cb;
320         uloop_timeout_set(&conn->timer, 1000);
321 }
322 
323 static void ubus_auto_connect_cb(struct uloop_timeout *timeout)
324 {
325         struct ubus_auto_conn *conn = container_of(timeout, struct ubus_auto_conn, timer);
326 
327         if (ubus_connect_ctx(&conn->ctx, conn->path)) {
328                 uloop_timeout_set(timeout, 1000);
329                 fprintf(stderr, "failed to connect to ubus\n");
330                 return;
331         }
332         conn->ctx.connection_lost = ubus_auto_disconnect_cb;
333         if (conn->cb)
334                 conn->cb(&conn->ctx);
335         ubus_add_uloop(&conn->ctx);
336 }
337 
338 void ubus_auto_connect(struct ubus_auto_conn *conn)
339 {
340         conn->timer.cb = ubus_auto_connect_cb;
341         ubus_auto_connect_cb(&conn->timer);
342 }
343 
344 struct ubus_context *ubus_connect(const char *path)
345 {
346         struct ubus_context *ctx;
347 
348         ctx = calloc(1, sizeof(*ctx));
349         if (!ctx)
350                 return NULL;
351 
352         if (ubus_connect_ctx(ctx, path)) {
353                 free(ctx);
354                 ctx = NULL;
355         }
356 
357         return ctx;
358 }
359 
360 void ubus_shutdown(struct ubus_context *ctx)
361 {
362         blob_buf_free(&b);
363         if (!ctx)
364                 return;
365         close(ctx->sock.fd);
366         uloop_timeout_cancel(&ctx->pending_timer);
367         free(ctx->msgbuf.data);
368 }
369 
370 void ubus_free(struct ubus_context *ctx)
371 {
372         ubus_shutdown(ctx);
373         free(ctx);
374 }
375 

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