ubus.c

   1 /*
   2  * Copyright (C) 2014 John Crispin <blogic@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 <arpa/inet.h>
  16
  17 #include <stdio.h>
  18
  19 #include <libubus.h>
  20 #include <libubox/vlist.h>
  21 #include <libubox/uloop.h>
  22
  23 #include "util.h"
  24 #include "ubus.h"
  25 #include "cache.h"
  26 #include "service.h"
  27 #include "interface.h"
  28
  29 static struct ubus_auto_conn conn;
  30 static struct blob_buf b;
  31 static struct ubus_subscriber udebug_sub;
  32
  33 static int
  34 umdns_reload(struct ubus_context *ctx, struct ubus_object *obj,
  35                 struct ubus_request_data *req, const char *method,
  36                 struct blob_attr *msg)
  37 {
  38         service_init(1);
  39         return 0;
  40 }
  41
  42 static int
  43 umdns_update(struct ubus_context *ctx, struct ubus_object *obj,
  44                 struct ubus_request_data *req, const char *method,
  45                 struct blob_attr *msg)
  46 {
  47         cache_update();
  48         return 0;
  49 }
  50
  51 enum {
  52         BROWSE_SERVICE,
  53         BROWSE_ARRAY,
  54         BROWSE_ADDRESS,
  55         BROWSE_MAX
  56 };
  57
  58 static const struct blobmsg_policy browse_policy[] = {
  59         [BROWSE_SERVICE]        = { "service", BLOBMSG_TYPE_STRING },
  60         [BROWSE_ARRAY]          = { "array", BLOBMSG_TYPE_BOOL },
  61         [BROWSE_ADDRESS]        = { "address", BLOBMSG_TYPE_BOOL },
  62 };
  63
  64 static int
  65 umdns_browse(struct ubus_context *ctx, struct ubus_object *obj,
  66                 struct ubus_request_data *req, const char *method,
  67                 struct blob_attr *msg)
  68 {
  69         struct cache_service *s, *q;
  70         char *buffer = (char *) mdns_buf;
  71         struct blob_attr *data[BROWSE_MAX];
  72         void *c1 = NULL, *c2;
  73         char *service = NULL;
  74         int array = 0;
  75         bool address = true;
  76
  77         blobmsg_parse(browse_policy, BROWSE_MAX, data, blob_data(msg), blob_len(msg));
  78         if (data[BROWSE_SERVICE])
  79                 service = blobmsg_get_string(data[BROWSE_SERVICE]);
  80         if (data[BROWSE_ARRAY])
  81                 array = blobmsg_get_u8(data[BROWSE_ARRAY]);
  82         if (data[BROWSE_ADDRESS])
  83                 address = blobmsg_get_bool(data[BROWSE_ADDRESS]);
  84
  85         blob_buf_init(&b, 0);
  86         avl_for_each_element(&services, s, avl) {
  87                 const char *hostname = buffer;
  88                 char *local;
  89
  90                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->avl.key);
  91                 local = strstr(buffer, ".local");
  92                 if (local)
  93                         *local = '\0';
  94                 if (!strcmp(buffer, "_tcp") || !strcmp(buffer, "_udp"))
  95                         continue;
  96                 if (service && strcmp(buffer, service))
  97                         continue;
  98                 if (!c1) {
  99                         c1 = blobmsg_open_table(&b, buffer);
 100                 }
 101                 snprintf(buffer, MAX_NAME_LEN, "%s", s->entry);
 102                 local = strstr(buffer, "._");
 103                 if (local)
 104                         *local = '\0';
 105                 c2 = blobmsg_open_table(&b, buffer);
 106                 strncat(buffer, ".local", MAX_NAME_LEN);
 107                 if (s->iface)
 108                         blobmsg_add_string(&b, "iface", s->iface->name);
 109                 cache_dump_records(&b, s->entry, array, &hostname);
 110                 if (address)
 111                         cache_dump_records(&b, hostname, array, NULL);
 112                 blobmsg_close_table(&b, c2);
 113                 q = avl_next_element(s, avl);
 114                 if (!q || avl_is_last(&services, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
 115                         blobmsg_close_table(&b, c1);
 116                         c1 = NULL;
 117                 }
 118         }
 119         ubus_send_reply(ctx, req, b.head);
 120
 121         return UBUS_STATUS_OK;
 122 }
 123
 124 enum {
 125         HOSTS_ARRAY,
 126         __HOSTS_MAX
 127 };
 128 static const struct blobmsg_policy hosts_policy[] = {
 129         [HOSTS_ARRAY] = { "array", BLOBMSG_TYPE_BOOL }
 130 };
 131
 132 static int
 133 umdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
 134                 struct ubus_request_data *req, const char *method,
 135                 struct blob_attr *msg)
 136 {
 137         struct cache_record *prev = NULL;
 138         struct blob_attr *tb[__HOSTS_MAX];
 139         struct cache_record *r;
 140         bool array = false;
 141         void *c;
 142
 143         blobmsg_parse(hosts_policy, __HOSTS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
 144         if (tb[HOSTS_ARRAY])
 145                 array = blobmsg_get_bool(tb[HOSTS_ARRAY]);
 146
 147         blob_buf_init(&b, 0);
 148         avl_for_each_element(&records, r, avl) {
 149                 if (r->type != TYPE_A && r->type != TYPE_AAAA)
 150                         continue;
 151                 /* Query each domain just once */
 152                 if (!prev || strcmp(r->record, prev->record)) {
 153                         c = blobmsg_open_table(&b, r->record);
 154                         cache_dump_records(&b, r->record, array, NULL);
 155                         blobmsg_close_table(&b, c);
 156                 }
 157                 prev = r;
 158         }
 159         ubus_send_reply(ctx, req, b.head);
 160
 161         return UBUS_STATUS_OK;
 162 }
 163
 164 enum {
 165         CFG_INTERFACES,
 166         CFG_KEEP,
 167         CFG_MAX
 168 };
 169
 170 static const struct blobmsg_policy config_policy[] = {
 171         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 172         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 173 };
 174
 175 static int
 176 umdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 177                     struct ubus_request_data *req, const char *method,
 178                     struct blob_attr *msg)
 179 {
 180         struct blob_attr *data[CFG_MAX], *cur;
 181         int rem, keep = false;
 182
 183         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 184         if (!data[CFG_INTERFACES])
 185                 return UBUS_STATUS_INVALID_ARGUMENT;
 186
 187         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 188                 return UBUS_STATUS_INVALID_ARGUMENT;
 189
 190         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 191         if (!keep) {
 192                 vlist_update(&interfaces);
 193                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 194         }
 195
 196         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 197                 interface_add(blobmsg_data(cur));
 198
 199         if (!keep)
 200                 vlist_flush(&interfaces);
 201
 202         return 0;
 203 }
 204
 205 enum query_attr {
 206         QUERY_QUESTION,
 207         QUERY_IFACE,
 208         QUERY_TYPE,
 209         QUERY_MAX
 210 };
 211
 212 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 213         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 214         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 215         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 216 };
 217
 218 static int
 219 umdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 220                     struct ubus_request_data *req, const char *method,
 221                     struct blob_attr *msg)
 222 {
 223         struct blob_attr *tb[QUERY_MAX], *c;
 224         const char *question = C_DNS_SD;
 225         const char *ifname;
 226         int type = TYPE_ANY;
 227
 228         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 229
 230         if (!(c = tb[QUERY_IFACE]))
 231                 return UBUS_STATUS_INVALID_ARGUMENT;
 232
 233         ifname = blobmsg_get_string(c);
 234
 235         if ((c = tb[QUERY_QUESTION]))
 236                 question = blobmsg_get_string(c);
 237
 238         if ((c = tb[QUERY_TYPE]))
 239                 type = blobmsg_get_u32(c);
 240
 241         struct interface *iface_v4 = interface_get(ifname, SOCK_MC_IPV4);
 242         struct interface *iface_v6 = interface_get(ifname, SOCK_MC_IPV6);
 243
 244         if (!iface_v4 && !iface_v6)
 245                 return UBUS_STATUS_NOT_FOUND;
 246
 247         if (!strcmp(method, "query")) {
 248                 if (iface_v4)
 249                         dns_send_question(iface_v4, NULL, question, type, 1);
 250
 251                 if (iface_v6)
 252                         dns_send_question(iface_v6, NULL, question, type, 1);
 253
 254                 return UBUS_STATUS_OK;
 255         } else if (!strcmp(method, "fetch")) {
 256                 blob_buf_init(&b, 0);
 257                 void *k = blobmsg_open_array(&b, "records");
 258                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 259                 blobmsg_close_array(&b, k);
 260                 ubus_send_reply(ctx, req, b.head);
 261                 return UBUS_STATUS_OK;
 262         } else {
 263                 return UBUS_STATUS_INVALID_ARGUMENT;
 264         }
 265 }
 266
 267
 268 static const struct ubus_method umdns_methods[] = {
 269         UBUS_METHOD("set_config", umdns_set_config, config_policy),
 270         UBUS_METHOD("query", umdns_query, query_policy),
 271         UBUS_METHOD("fetch", umdns_query, query_policy),
 272         UBUS_METHOD("browse", umdns_browse, browse_policy),
 273         UBUS_METHOD_NOARG("update", umdns_update),
 274         UBUS_METHOD("hosts", umdns_hosts, hosts_policy),
 275         UBUS_METHOD_NOARG("reload", umdns_reload),
 276 };
 277
 278 static struct ubus_object_type umdns_object_type =
 279         UBUS_OBJECT_TYPE("umdns", umdns_methods);
 280
 281 static struct ubus_object umdns_object = {
 282         .name = "umdns",
 283         .type = &umdns_object_type,
 284         .methods = umdns_methods,
 285         .n_methods = ARRAY_SIZE(umdns_methods),
 286 };
 287
 288 static struct blob_attr *
 289 find_attr(struct blob_attr *attr, const char *name, enum blobmsg_type type)
 290 {
 291         struct blobmsg_policy policy = { name, type };
 292         struct blob_attr *ret;
 293
 294         if (!attr)
 295                 return NULL;
 296
 297         blobmsg_parse_attr(&policy, 1, &ret, attr);
 298
 299         return ret;
 300 }
 301
 302 static void
 303 umdns_udebug_config_cb(struct blob_attr *data)
 304 {
 305         enum {
 306                 CFG_ATTR_ENABLED,
 307                 __CFG_ATTR_MAX
 308         };
 309         static const struct blobmsg_policy policy[__CFG_ATTR_MAX] = {
 310                 [CFG_ATTR_ENABLED] = { "enabled", BLOBMSG_TYPE_STRING },
 311         };
 312         struct blob_attr *tb[__CFG_ATTR_MAX];
 313         bool en;
 314
 315         data = find_attr(data, "service", BLOBMSG_TYPE_TABLE);
 316         data = find_attr(data, "umdns", BLOBMSG_TYPE_TABLE);
 317         if (!data)
 318                 return;
 319
 320         blobmsg_parse_attr(policy, __CFG_ATTR_MAX, tb, data);
 321         if (!tb[CFG_ATTR_ENABLED])
 322                 return;
 323
 324         en = !!atoi(blobmsg_get_string(tb[CFG_ATTR_ENABLED]));
 325         umdns_udebug_set_enabled(en);
 326 }
 327
 328 static int
 329 umdns_udebug_notify_cb(struct ubus_context *ctx, struct ubus_object *obj,
 330                         struct ubus_request_data *req, const char *method,
 331                         struct blob_attr *msg)
 332 {
 333         umdns_udebug_config_cb(msg);
 334
 335         return 0;
 336 }
 337
 338 static void
 339 umdns_udebug_req_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 340 {
 341         umdns_udebug_config_cb(msg);
 342 }
 343
 344 static bool
 345 umdns_udebug_sub_cb(struct ubus_context *ctx, struct ubus_subscriber *sub,
 346                      const char *path)
 347 {
 348         return !strcmp(path, "udebug");
 349 }
 350
 351
 352 static void
 353 ubus_connect_handler(struct ubus_context *ctx)
 354 {
 355         uint32_t id;
 356         int ret;
 357
 358         ret = ubus_add_object(ctx, &umdns_object);
 359         if (ret)
 360                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 361
 362         udebug_sub.cb = umdns_udebug_notify_cb;
 363         udebug_sub.new_obj_cb = umdns_udebug_sub_cb;
 364         ubus_register_subscriber(&conn.ctx, &udebug_sub);
 365         if (ubus_lookup_id(&conn.ctx, "udebug", &id) == 0) {
 366                 ubus_subscribe(&conn.ctx, &udebug_sub, id);
 367                 ubus_invoke(&conn.ctx, id, "get_config", NULL, umdns_udebug_req_cb, NULL, 1000);
 368         }
 369 }
 370
 371 void
 372 ubus_startup(void)
 373 {
 374         conn.cb = ubus_connect_handler;
 375         ubus_auto_connect(&conn);
 376 }
 377
 378 int ubus_service_list(ubus_data_handler_t cb)
 379 {
 380         uint32_t id;
 381         int ret;
 382
 383         blob_buf_init(&b, 0);
 384         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 385         if (ret)
 386                 return ret;
 387
 388         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 389 }