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
This page was automatically generated by LXR 0.3.1. • OpenWrt