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                 blobmsg_add_string(&b, "iface", s->iface->name);
 108                 cache_dump_records(&b, s->entry, array, &hostname);
 109                 if (address)
 110                         cache_dump_records(&b, hostname, array, NULL);
 111                 blobmsg_close_table(&b, c2);
 112                 q = avl_next_element(s, avl);
 113                 if (!q || avl_is_last(&services, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
 114                         blobmsg_close_table(&b, c1);
 115                         c1 = NULL;
 116                 }
 117         }
 118         ubus_send_reply(ctx, req, b.head);
 119
 120         return UBUS_STATUS_OK;
 121 }
 122
 123 enum {
 124         HOSTS_ARRAY,
 125         __HOSTS_MAX
 126 };
 127 static const struct blobmsg_policy hosts_policy[] = {
 128         [HOSTS_ARRAY] = { "array", BLOBMSG_TYPE_BOOL }
 129 };
 130
 131 static int
 132 umdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
 133                 struct ubus_request_data *req, const char *method,
 134                 struct blob_attr *msg)
 135 {
 136         struct cache_record *prev = NULL;
 137         struct blob_attr *tb[__HOSTS_MAX];
 138         struct cache_record *r;
 139         bool array = false;
 140         void *c;
 141
 142         blobmsg_parse(hosts_policy, __HOSTS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
 143         if (tb[HOSTS_ARRAY])
 144                 array = blobmsg_get_bool(tb[HOSTS_ARRAY]);
 145
 146         blob_buf_init(&b, 0);
 147         avl_for_each_element(&records, r, avl) {
 148                 if (r->type != TYPE_A && r->type != TYPE_AAAA)
 149                         continue;
 150                 /* Query each domain just once */
 151                 if (!prev || strcmp(r->record, prev->record)) {
 152                         c = blobmsg_open_table(&b, r->record);
 153                         cache_dump_records(&b, r->record, array, NULL);
 154                         blobmsg_close_table(&b, c);
 155                 }
 156                 prev = r;
 157         }
 158         ubus_send_reply(ctx, req, b.head);
 159
 160         return UBUS_STATUS_OK;
 161 }
 162
 163 enum {
 164         CFG_INTERFACES,
 165         CFG_KEEP,
 166         CFG_MAX
 167 };
 168
 169 static const struct blobmsg_policy config_policy[] = {
 170         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 171         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 172 };
 173
 174 static int
 175 umdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 176                     struct ubus_request_data *req, const char *method,
 177                     struct blob_attr *msg)
 178 {
 179         struct blob_attr *data[CFG_MAX], *cur;
 180         int rem, keep = false;
 181
 182         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 183         if (!data[CFG_INTERFACES])
 184                 return UBUS_STATUS_INVALID_ARGUMENT;
 185
 186         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 187                 return UBUS_STATUS_INVALID_ARGUMENT;
 188
 189         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 190         if (!keep) {
 191                 vlist_update(&interfaces);
 192                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 193         }
 194
 195         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 196                 interface_add(blobmsg_data(cur));
 197
 198         if (!keep)
 199                 vlist_flush(&interfaces);
 200
 201         return 0;
 202 }
 203
 204 enum query_attr {
 205         QUERY_QUESTION,
 206         QUERY_IFACE,
 207         QUERY_TYPE,
 208         QUERY_MAX
 209 };
 210
 211 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 212         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 213         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 214         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 215 };
 216
 217 static int
 218 umdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 219                     struct ubus_request_data *req, const char *method,
 220                     struct blob_attr *msg)
 221 {
 222         struct blob_attr *tb[QUERY_MAX], *c;
 223         const char *question = C_DNS_SD;
 224         const char *ifname;
 225         int type = TYPE_ANY;
 226
 227         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 228
 229         if (!(c = tb[QUERY_IFACE]))
 230                 return UBUS_STATUS_INVALID_ARGUMENT;
 231
 232         ifname = blobmsg_get_string(c);
 233
 234         if ((c = tb[QUERY_QUESTION]))
 235                 question = blobmsg_get_string(c);
 236
 237         if ((c = tb[QUERY_TYPE]))
 238                 type = blobmsg_get_u32(c);
 239
 240         struct interface *iface_v4 = interface_get(ifname, SOCK_MC_IPV4);
 241         struct interface *iface_v6 = interface_get(ifname, SOCK_MC_IPV6);
 242
 243         if (!iface_v4 && !iface_v6)
 244                 return UBUS_STATUS_NOT_FOUND;
 245
 246         if (!strcmp(method, "query")) {
 247                 if (iface_v4)
 248                         dns_send_question(iface_v4, NULL, question, type, 1);
 249
 250                 if (iface_v6)
 251                         dns_send_question(iface_v6, NULL, question, type, 1);
 252
 253                 return UBUS_STATUS_OK;
 254         } else if (!strcmp(method, "fetch")) {
 255                 blob_buf_init(&b, 0);
 256                 void *k = blobmsg_open_array(&b, "records");
 257                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 258                 blobmsg_close_array(&b, k);
 259                 ubus_send_reply(ctx, req, b.head);
 260                 return UBUS_STATUS_OK;
 261         } else {
 262                 return UBUS_STATUS_INVALID_ARGUMENT;
 263         }
 264 }
 265
 266
 267 static const struct ubus_method umdns_methods[] = {
 268         UBUS_METHOD("set_config", umdns_set_config, config_policy),
 269         UBUS_METHOD("query", umdns_query, query_policy),
 270         UBUS_METHOD("fetch", umdns_query, query_policy),
 271         UBUS_METHOD("browse", umdns_browse, browse_policy),
 272         UBUS_METHOD_NOARG("update", umdns_update),
 273         UBUS_METHOD("hosts", umdns_hosts, hosts_policy),
 274         UBUS_METHOD_NOARG("reload", umdns_reload),
 275 };
 276
 277 static struct ubus_object_type umdns_object_type =
 278         UBUS_OBJECT_TYPE("umdns", umdns_methods);
 279
 280 static struct ubus_object umdns_object = {
 281         .name = "umdns",
 282         .type = &umdns_object_type,
 283         .methods = umdns_methods,
 284         .n_methods = ARRAY_SIZE(umdns_methods),
 285 };
 286
 287 static struct blob_attr *
 288 find_attr(struct blob_attr *attr, const char *name, enum blobmsg_type type)
 289 {
 290         struct blobmsg_policy policy = { name, type };
 291         struct blob_attr *ret;
 292
 293         if (!attr)
 294                 return NULL;
 295
 296         blobmsg_parse_attr(&policy, 1, &ret, attr);
 297
 298         return ret;
 299 }
 300
 301 static void
 302 umdns_udebug_config_cb(struct blob_attr *data)
 303 {
 304         enum {
 305                 CFG_ATTR_ENABLED,
 306                 __CFG_ATTR_MAX
 307         };
 308         static const struct blobmsg_policy policy[__CFG_ATTR_MAX] = {
 309                 [CFG_ATTR_ENABLED] = { "enabled", BLOBMSG_TYPE_STRING },
 310         };
 311         struct blob_attr *tb[__CFG_ATTR_MAX];
 312         bool en;
 313
 314         data = find_attr(data, "service", BLOBMSG_TYPE_TABLE);
 315         data = find_attr(data, "umdns", BLOBMSG_TYPE_TABLE);
 316         if (!data)
 317                 return;
 318
 319         blobmsg_parse_attr(policy, __CFG_ATTR_MAX, tb, data);
 320         if (!tb[CFG_ATTR_ENABLED])
 321                 return;
 322
 323         en = !!atoi(blobmsg_get_string(tb[CFG_ATTR_ENABLED]));
 324         umdns_udebug_set_enabled(en);
 325 }
 326
 327 static int
 328 umdns_udebug_notify_cb(struct ubus_context *ctx, struct ubus_object *obj,
 329                         struct ubus_request_data *req, const char *method,
 330                         struct blob_attr *msg)
 331 {
 332         umdns_udebug_config_cb(msg);
 333
 334         return 0;
 335 }
 336
 337 static void
 338 umdns_udebug_req_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 339 {
 340         umdns_udebug_config_cb(msg);
 341 }
 342
 343 static bool
 344 umdns_udebug_sub_cb(struct ubus_context *ctx, struct ubus_subscriber *sub,
 345                      const char *path)
 346 {
 347         return !strcmp(path, "udebug");
 348 }
 349
 350
 351 static void
 352 ubus_connect_handler(struct ubus_context *ctx)
 353 {
 354         uint32_t id;
 355         int ret;
 356
 357         ret = ubus_add_object(ctx, &umdns_object);
 358         if (ret)
 359                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 360
 361         udebug_sub.cb = umdns_udebug_notify_cb;
 362         udebug_sub.new_obj_cb = umdns_udebug_sub_cb;
 363         ubus_register_subscriber(&conn.ctx, &udebug_sub);
 364         if (ubus_lookup_id(&conn.ctx, "udebug", &id) == 0) {
 365                 ubus_subscribe(&conn.ctx, &udebug_sub, id);
 366                 ubus_invoke(&conn.ctx, id, "get_config", NULL, umdns_udebug_req_cb, NULL, 1000);
 367         }
 368 }
 369
 370 void
 371 ubus_startup(void)
 372 {
 373         conn.cb = ubus_connect_handler;
 374         ubus_auto_connect(&conn);
 375 }
 376
 377 int ubus_service_list(ubus_data_handler_t cb)
 378 {
 379         uint32_t id;
 380         int ret;
 381
 382         blob_buf_init(&b, 0);
 383         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 384         if (ret)
 385                 return ret;
 386
 387         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 388 }