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
  32 static int
  33 umdns_reload(struct ubus_context *ctx, struct ubus_object *obj,
  34                 struct ubus_request_data *req, const char *method,
  35                 struct blob_attr *msg)
  36 {
  37         service_init(1);
  38         return 0;
  39 }
  40
  41 static int
  42 umdns_update(struct ubus_context *ctx, struct ubus_object *obj,
  43                 struct ubus_request_data *req, const char *method,
  44                 struct blob_attr *msg)
  45 {
  46         cache_update();
  47         return 0;
  48 }
  49
  50 enum {
  51         BROWSE_SERVICE,
  52         BROWSE_ARRAY,
  53         BROWSE_ADDRESS,
  54         BROWSE_MAX
  55 };
  56
  57 static const struct blobmsg_policy browse_policy[] = {
  58         [BROWSE_SERVICE]        = { "service", BLOBMSG_TYPE_STRING },
  59         [BROWSE_ARRAY]          = { "array", BLOBMSG_TYPE_BOOL },
  60         [BROWSE_ADDRESS]        = { "address", BLOBMSG_TYPE_BOOL },
  61 };
  62
  63 static int
  64 umdns_browse(struct ubus_context *ctx, struct ubus_object *obj,
  65                 struct ubus_request_data *req, const char *method,
  66                 struct blob_attr *msg)
  67 {
  68         struct cache_service *s, *q;
  69         char *buffer = (char *) mdns_buf;
  70         struct blob_attr *data[BROWSE_MAX];
  71         void *c1 = NULL, *c2;
  72         char *service = NULL;
  73         int array = 0;
  74         bool address = true;
  75
  76         blobmsg_parse(browse_policy, BROWSE_MAX, data, blob_data(msg), blob_len(msg));
  77         if (data[BROWSE_SERVICE])
  78                 service = blobmsg_get_string(data[BROWSE_SERVICE]);
  79         if (data[BROWSE_ARRAY])
  80                 array = blobmsg_get_u8(data[BROWSE_ARRAY]);
  81         if (data[BROWSE_ADDRESS])
  82                 address = blobmsg_get_bool(data[BROWSE_ADDRESS]);
  83
  84         blob_buf_init(&b, 0);
  85         avl_for_each_element(&services, s, avl) {
  86                 const char *hostname = buffer;
  87                 char *local;
  88
  89                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->avl.key);
  90                 local = strstr(buffer, ".local");
  91                 if (local)
  92                         *local = '\0';
  93                 if (!strcmp(buffer, "_tcp") || !strcmp(buffer, "_udp"))
  94                         continue;
  95                 if (service && strcmp(buffer, service))
  96                         continue;
  97                 if (!c1) {
  98                         c1 = blobmsg_open_table(&b, buffer);
  99                 }
 100                 snprintf(buffer, MAX_NAME_LEN, "%s", s->entry);
 101                 local = strstr(buffer, "._");
 102                 if (local)
 103                         *local = '\0';
 104                 c2 = blobmsg_open_table(&b, buffer);
 105                 strncat(buffer, ".local", MAX_NAME_LEN);
 106                 blobmsg_add_string(&b, "iface", s->iface->name);
 107                 cache_dump_records(&b, s->entry, array, &hostname);
 108                 if (address)
 109                         cache_dump_records(&b, hostname, array, NULL);
 110                 blobmsg_close_table(&b, c2);
 111                 q = avl_next_element(s, avl);
 112                 if (!q || avl_is_last(&services, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
 113                         blobmsg_close_table(&b, c1);
 114                         c1 = NULL;
 115                 }
 116         }
 117         ubus_send_reply(ctx, req, b.head);
 118
 119         return UBUS_STATUS_OK;
 120 }
 121
 122 enum {
 123         HOSTS_ARRAY,
 124         __HOSTS_MAX
 125 };
 126 static const struct blobmsg_policy hosts_policy[] = {
 127         [HOSTS_ARRAY] = { "array", BLOBMSG_TYPE_BOOL }
 128 };
 129
 130 static int
 131 umdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
 132                 struct ubus_request_data *req, const char *method,
 133                 struct blob_attr *msg)
 134 {
 135         struct cache_record *prev = NULL;
 136         struct blob_attr *tb[__HOSTS_MAX];
 137         struct cache_record *r;
 138         bool array = false;
 139         void *c;
 140
 141         blobmsg_parse(hosts_policy, __HOSTS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
 142         if (tb[HOSTS_ARRAY])
 143                 array = blobmsg_get_bool(tb[HOSTS_ARRAY]);
 144
 145         blob_buf_init(&b, 0);
 146         avl_for_each_element(&records, r, avl) {
 147                 if (r->type != TYPE_A && r->type != TYPE_AAAA)
 148                         continue;
 149                 /* Query each domain just once */
 150                 if (!prev || strcmp(r->record, prev->record)) {
 151                         c = blobmsg_open_table(&b, r->record);
 152                         cache_dump_records(&b, r->record, array, NULL);
 153                         blobmsg_close_table(&b, c);
 154                 }
 155                 prev = r;
 156         }
 157         ubus_send_reply(ctx, req, b.head);
 158
 159         return UBUS_STATUS_OK;
 160 }
 161
 162 enum {
 163         CFG_INTERFACES,
 164         CFG_KEEP,
 165         CFG_MAX
 166 };
 167
 168 static const struct blobmsg_policy config_policy[] = {
 169         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 170         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 171 };
 172
 173 static int
 174 umdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 175                     struct ubus_request_data *req, const char *method,
 176                     struct blob_attr *msg)
 177 {
 178         struct blob_attr *data[CFG_MAX], *cur;
 179         int rem, keep = false;
 180
 181         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 182         if (!data[CFG_INTERFACES])
 183                 return UBUS_STATUS_INVALID_ARGUMENT;
 184
 185         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 186                 return UBUS_STATUS_INVALID_ARGUMENT;
 187
 188         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 189         if (!keep) {
 190                 vlist_update(&interfaces);
 191                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 192         }
 193
 194         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 195                 interface_add(blobmsg_data(cur));
 196
 197         if (!keep)
 198                 vlist_flush(&interfaces);
 199
 200         return 0;
 201 }
 202
 203 enum query_attr {
 204         QUERY_QUESTION,
 205         QUERY_IFACE,
 206         QUERY_TYPE,
 207         QUERY_MAX
 208 };
 209
 210 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 211         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 212         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 213         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 214 };
 215
 216 static int
 217 umdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 218                     struct ubus_request_data *req, const char *method,
 219                     struct blob_attr *msg)
 220 {
 221         struct blob_attr *tb[QUERY_MAX], *c;
 222         const char *question = C_DNS_SD;
 223         const char *ifname;
 224         int type = TYPE_ANY;
 225
 226         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 227
 228         if (!(c = tb[QUERY_IFACE]))
 229                 return UBUS_STATUS_INVALID_ARGUMENT;
 230
 231         ifname = blobmsg_get_string(c);
 232
 233         if ((c = tb[QUERY_QUESTION]))
 234                 question = blobmsg_get_string(c);
 235
 236         if ((c = tb[QUERY_TYPE]))
 237                 type = blobmsg_get_u32(c);
 238
 239         struct interface *iface_v4 = interface_get(ifname, SOCK_MC_IPV4);
 240         struct interface *iface_v6 = interface_get(ifname, SOCK_MC_IPV6);
 241
 242         if (!iface_v4 && !iface_v6)
 243                 return UBUS_STATUS_NOT_FOUND;
 244
 245         if (!strcmp(method, "query")) {
 246                 if (iface_v4)
 247                         dns_send_question(iface_v4, NULL, question, type, 1);
 248
 249                 if (iface_v6)
 250                         dns_send_question(iface_v6, NULL, question, type, 1);
 251
 252                 return UBUS_STATUS_OK;
 253         } else if (!strcmp(method, "fetch")) {
 254                 blob_buf_init(&b, 0);
 255                 void *k = blobmsg_open_array(&b, "records");
 256                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 257                 blobmsg_close_array(&b, k);
 258                 ubus_send_reply(ctx, req, b.head);
 259                 return UBUS_STATUS_OK;
 260         } else {
 261                 return UBUS_STATUS_INVALID_ARGUMENT;
 262         }
 263 }
 264
 265
 266 static const struct ubus_method umdns_methods[] = {
 267         UBUS_METHOD("set_config", umdns_set_config, config_policy),
 268         UBUS_METHOD("query", umdns_query, query_policy),
 269         UBUS_METHOD("fetch", umdns_query, query_policy),
 270         UBUS_METHOD("browse", umdns_browse, browse_policy),
 271         UBUS_METHOD_NOARG("update", umdns_update),
 272         UBUS_METHOD("hosts", umdns_hosts, hosts_policy),
 273         UBUS_METHOD_NOARG("reload", umdns_reload),
 274 };
 275
 276 static struct ubus_object_type umdns_object_type =
 277         UBUS_OBJECT_TYPE("umdns", umdns_methods);
 278
 279 static struct ubus_object umdns_object = {
 280         .name = "umdns",
 281         .type = &umdns_object_type,
 282         .methods = umdns_methods,
 283         .n_methods = ARRAY_SIZE(umdns_methods),
 284 };
 285
 286 static void
 287 ubus_connect_handler(struct ubus_context *ctx)
 288 {
 289         int ret;
 290
 291         ret = ubus_add_object(ctx, &umdns_object);
 292         if (ret)
 293                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 294 }
 295
 296 void
 297 ubus_startup(void)
 298 {
 299         conn.cb = ubus_connect_handler;
 300         ubus_auto_connect(&conn);
 301 }
 302
 303 int ubus_service_list(ubus_data_handler_t cb)
 304 {
 305         uint32_t id;
 306         int ret;
 307
 308         blob_buf_init(&b, 0);
 309         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 310         if (ret)
 311                 return ret;
 312
 313         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 314 }