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 ctx->stack_depth++; 107 ubus_process_obj_msg(ctx, buf, fd); 108 ctx->stack_depth--; 109 break; 110 case UBUS_MSG_MONITOR: 111 if (ctx->monitor_cb) 112 ctx->monitor_cb(ctx, buf->hdr.seq, buf->data); 113 break; 114 } 115 } 116 117 static void ubus_process_pending_msg(struct uloop_timeout *timeout) 118 { 119 struct ubus_context *ctx = container_of(timeout, struct ubus_context, pending_timer); 120 struct ubus_pending_msg *pending; 121 122 while (!list_empty(&ctx->pending)) { 123 if (ctx->stack_depth) 124 break; 125 126 pending = list_first_entry(&ctx->pending, struct ubus_pending_msg, list); 127 list_del(&pending->list); 128 ubus_process_msg(ctx, &pending->hdr, -1); 129 free(pending); 130 } 131 } 132 133 struct ubus_lookup_request { 134 struct ubus_request req; 135 ubus_lookup_handler_t cb; 136 }; 137 138 static void ubus_lookup_cb(struct ubus_request *ureq, int type, struct blob_attr *msg) 139 { 140 struct ubus_lookup_request *req; 141 struct ubus_object_data obj = {}; 142 struct blob_attr **attr; 143 144 req = container_of(ureq, struct ubus_lookup_request, req); 145 attr = ubus_parse_msg(msg, blob_raw_len(msg)); 146 147 if (!attr[UBUS_ATTR_OBJID] || !attr[UBUS_ATTR_OBJPATH] || 148 !attr[UBUS_ATTR_OBJTYPE]) 149 return; 150 151 obj.id = blob_get_u32(attr[UBUS_ATTR_OBJID]); 152 obj.path = blob_data(attr[UBUS_ATTR_OBJPATH]); 153 obj.type_id = blob_get_u32(attr[UBUS_ATTR_OBJTYPE]); 154 obj.signature = attr[UBUS_ATTR_SIGNATURE]; 155 req->cb(ureq->ctx, &obj, ureq->priv); 156 } 157 158 int ubus_lookup(struct ubus_context *ctx, const char *path, 159 ubus_lookup_handler_t cb, void *priv) 160 { 161 struct ubus_lookup_request lookup; 162 163 blob_buf_init(&b, 0); 164 if (path) 165 blob_put_string(&b, UBUS_ATTR_OBJPATH, path); 166 167 if (ubus_start_request(ctx, &lookup.req, b.head, UBUS_MSG_LOOKUP, 0) < 0) 168 return UBUS_STATUS_INVALID_ARGUMENT; 169 170 lookup.req.raw_data_cb = ubus_lookup_cb; 171 lookup.req.priv = priv; 172 lookup.cb = cb; 173 return ubus_complete_request(ctx, &lookup.req, 0); 174 } 175 176 static void ubus_lookup_id_cb(struct ubus_request *req, int type, struct blob_attr *msg) 177 { 178 struct blob_attr **attr; 179 uint32_t *id = req->priv; 180 181 attr = ubus_parse_msg(msg, blob_raw_len(msg)); 182 183 if (!attr[UBUS_ATTR_OBJID]) 184 return; 185 186 *id = blob_get_u32(attr[UBUS_ATTR_OBJID]); 187 } 188 189 int ubus_lookup_id(struct ubus_context *ctx, const char *path, uint32_t *id) 190 { 191 struct ubus_request req; 192 193 blob_buf_init(&b, 0); 194 if (path) 195 blob_put_string(&b, UBUS_ATTR_OBJPATH, path); 196 197 if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_LOOKUP, 0) < 0) 198 return UBUS_STATUS_INVALID_ARGUMENT; 199 200 req.raw_data_cb = ubus_lookup_id_cb; 201 req.priv = id; 202 203 return ubus_complete_request(ctx, &req, 0); 204 } 205 206 static int ubus_event_cb(struct ubus_context *ctx, struct ubus_object *obj, 207 struct ubus_request_data *req, 208 const char *method, struct blob_attr *msg) 209 { 210 struct ubus_event_handler *ev; 211 212 ev = container_of(obj, struct ubus_event_handler, obj); 213 ev->cb(ctx, ev, method, msg); 214 return 0; 215 } 216 217 static const struct ubus_method event_method = { 218 .name = NULL, 219 .handler = ubus_event_cb, 220 }; 221 222 int ubus_register_event_handler(struct ubus_context *ctx, 223 struct ubus_event_handler *ev, 224 const char *pattern) 225 { 226 struct ubus_object *obj = &ev->obj; 227 struct blob_buf b2 = {}; 228 int ret; 229 230 if (!obj->id) { 231 obj->methods = &event_method; 232 obj->n_methods = 1; 233 234 if (!!obj->name ^ !!obj->type) 235 return UBUS_STATUS_INVALID_ARGUMENT; 236 237 ret = ubus_add_object(ctx, obj); 238 if (ret) 239 return ret; 240 } 241 242 /* use a second buffer, ubus_invoke() overwrites the primary one */ 243 blob_buf_init(&b2, 0); 244 blobmsg_add_u32(&b2, "object", obj->id); 245 if (pattern) 246 blobmsg_add_string(&b2, "pattern", pattern); 247 248 ret = ubus_invoke(ctx, UBUS_SYSTEM_OBJECT_EVENT, "register", b2.head, 249 NULL, NULL, 0); 250 blob_buf_free(&b2); 251 252 return ret; 253 } 254 255 int ubus_send_event(struct ubus_context *ctx, const char *id, 256 struct blob_attr *data) 257 { 258 struct ubus_request req; 259 void *s; 260 261 blob_buf_init(&b, 0); 262 blob_put_int32(&b, UBUS_ATTR_OBJID, UBUS_SYSTEM_OBJECT_EVENT); 263 blob_put_string(&b, UBUS_ATTR_METHOD, "send"); 264 s = blob_nest_start(&b, UBUS_ATTR_DATA); 265 blobmsg_add_string(&b, "id", id); 266 blobmsg_add_field(&b, BLOBMSG_TYPE_TABLE, "data", blob_data(data), blob_len(data)); 267 blob_nest_end(&b, s); 268 269 if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_INVOKE, UBUS_SYSTEM_OBJECT_EVENT) < 0) 270 return UBUS_STATUS_INVALID_ARGUMENT; 271 272 return ubus_complete_request(ctx, &req, 0); 273 } 274 275 static void ubus_default_connection_lost(struct ubus_context *ctx) 276 { 277 if (ctx->sock.registered) 278 uloop_end(); 279 } 280 281 int ubus_connect_ctx(struct ubus_context *ctx, const char *path) 282 { 283 uloop_init(); 284 memset(ctx, 0, sizeof(*ctx)); 285 286 ctx->sock.fd = -1; 287 ctx->sock.cb = ubus_handle_data; 288 ctx->connection_lost = ubus_default_connection_lost; 289 ctx->pending_timer.cb = ubus_process_pending_msg; 290 291 ctx->msgbuf.data = calloc(1, UBUS_MSG_CHUNK_SIZE); 292 if (!ctx->msgbuf.data) 293 return -1; 294 ctx->msgbuf_data_len = UBUS_MSG_CHUNK_SIZE; 295 296 INIT_LIST_HEAD(&ctx->requests); 297 INIT_LIST_HEAD(&ctx->pending); 298 avl_init(&ctx->objects, ubus_cmp_id, false, NULL); 299 if (ubus_reconnect(ctx, path)) { 300 free(ctx->msgbuf.data); 301 ctx->msgbuf.data = NULL; 302 return -1; 303 } 304 305 return 0; 306 } 307 308 static void ubus_auto_reconnect_cb(struct uloop_timeout *timeout) 309 { 310 struct ubus_auto_conn *conn = container_of(timeout, struct ubus_auto_conn, timer); 311 312 if (!ubus_reconnect(&conn->ctx, conn->path)) 313 ubus_add_uloop(&conn->ctx); 314 else 315 uloop_timeout_set(timeout, 1000); 316 } 317 318 static void ubus_auto_disconnect_cb(struct ubus_context *ctx) 319 { 320 struct ubus_auto_conn *conn = container_of(ctx, struct ubus_auto_conn, ctx); 321 322 conn->timer.cb = ubus_auto_reconnect_cb; 323 uloop_timeout_set(&conn->timer, 1000); 324 } 325 326 static void ubus_auto_connect_cb(struct uloop_timeout *timeout) 327 { 328 struct ubus_auto_conn *conn = container_of(timeout, struct ubus_auto_conn, timer); 329 330 if (ubus_connect_ctx(&conn->ctx, conn->path)) { 331 uloop_timeout_set(timeout, 1000); 332 fprintf(stderr, "failed to connect to ubus\n"); 333 return; 334 } 335 conn->ctx.connection_lost = ubus_auto_disconnect_cb; 336 if (conn->cb) 337 conn->cb(&conn->ctx); 338 ubus_add_uloop(&conn->ctx); 339 } 340 341 void ubus_auto_connect(struct ubus_auto_conn *conn) 342 { 343 conn->timer.cb = ubus_auto_connect_cb; 344 ubus_auto_connect_cb(&conn->timer); 345 } 346 347 struct ubus_context *ubus_connect(const char *path) 348 { 349 struct ubus_context *ctx; 350 351 ctx = calloc(1, sizeof(*ctx)); 352 if (!ctx) 353 return NULL; 354 355 if (ubus_connect_ctx(ctx, path)) { 356 free(ctx); 357 ctx = NULL; 358 } 359 360 return ctx; 361 } 362 363 void ubus_shutdown(struct ubus_context *ctx) 364 { 365 blob_buf_free(&b); 366 if (!ctx) 367 return; 368 close(ctx->sock.fd); 369 uloop_timeout_cancel(&ctx->pending_timer); 370 free(ctx->msgbuf.data); 371 } 372 373 void ubus_free(struct ubus_context *ctx) 374 { 375 ubus_shutdown(ctx); 376 free(ctx); 377 } 378
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