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 static int
  51 umdns_browse(struct ubus_context *ctx, struct ubus_object *obj,
  52                 struct ubus_request_data *req, const char *method,
  53                 struct blob_attr *msg)
  54 {
  55         struct cache_service *s, *q;
  56         char *buffer = (char *) mdns_buf;
  57         void *c1 = NULL, *c2;
  58
  59         blob_buf_init(&b, 0);
  60         avl_for_each_element(&services, s, avl) {
  61                 char *local;
  62                 if (cache_service_is_host(s))
  63                         continue;
  64                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->avl.key);
  65                 local = strstr(buffer, ".local");
  66                 if (local)
  67                         *local = '\0';
  68                 if (!strcmp(buffer, "_tcp") || !strcmp(buffer, "_udp"))
  69                         continue;
  70
  71                 if (!c1) {
  72                         c1 = blobmsg_open_table(&b, buffer);
  73                 }
  74                 snprintf(buffer, MAX_NAME_LEN, "%s", s->entry);
  75                 local = strstr(buffer, "._");
  76                 if (local)
  77                         *local = '\0';
  78                 c2 = blobmsg_open_table(&b, buffer);
  79                 strncat(buffer, ".local", MAX_NAME_LEN);
  80                 cache_dump_records(&b, buffer);
  81                 cache_dump_records(&b, s->entry);
  82                 blobmsg_close_table(&b, c2);
  83                 q = avl_next_element(s, avl);
  84                 if (!q || avl_is_last(&services, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
  85                         blobmsg_close_table(&b, c1);
  86                         c1 = NULL;
  87                 }
  88         }
  89         ubus_send_reply(ctx, req, b.head);
  90
  91         return UBUS_STATUS_OK;
  92 }
  93
  94 static int
  95 umdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
  96                 struct ubus_request_data *req, const char *method,
  97                 struct blob_attr *msg)
  98 {
  99         struct cache_service *s;
 100         void *c;
 101
 102         blob_buf_init(&b, 0);
 103         avl_for_each_element(&services, s, avl) {
 104                 if (!cache_service_is_host(s))
 105                         continue;
 106                 c = blobmsg_open_table(&b, s->entry);
 107                 cache_dump_records(&b, s->entry);
 108                 blobmsg_close_table(&b, c);
 109         }
 110         ubus_send_reply(ctx, req, b.head);
 111
 112         return UBUS_STATUS_OK;
 113 }
 114
 115 enum {
 116         CFG_INTERFACES,
 117         CFG_KEEP,
 118         CFG_MAX
 119 };
 120
 121 static const struct blobmsg_policy config_policy[] = {
 122         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 123         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 124 };
 125
 126 static int
 127 umdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 128                     struct ubus_request_data *req, const char *method,
 129                     struct blob_attr *msg)
 130 {
 131         struct blob_attr *data[CFG_MAX], *cur;
 132         int rem, keep = false;
 133
 134         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 135         if (!data[CFG_INTERFACES])
 136                 return UBUS_STATUS_INVALID_ARGUMENT;
 137
 138         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 139                 return UBUS_STATUS_INVALID_ARGUMENT;
 140
 141         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 142         if (!keep) {
 143                 vlist_update(&interfaces);
 144                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 145         }
 146
 147         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 148                 interface_add(blobmsg_data(cur));
 149
 150         if (!keep)
 151                 vlist_flush(&interfaces);
 152
 153         return 0;
 154 }
 155
 156 enum query_attr {
 157         QUERY_QUESTION,
 158         QUERY_IFACE,
 159         QUERY_TYPE,
 160         QUERY_MAX
 161 };
 162
 163 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 164         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 165         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 166         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 167 };
 168
 169 static int
 170 umdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 171                     struct ubus_request_data *req, const char *method,
 172                     struct blob_attr *msg)
 173 {
 174         struct blob_attr *tb[QUERY_MAX], *c;
 175         const char *question = "_services._dns-sd._udp.local";
 176         const char *ifname;
 177         int type = TYPE_ANY;
 178
 179         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 180
 181         if (!(c = tb[QUERY_IFACE]))
 182                 return UBUS_STATUS_INVALID_ARGUMENT;
 183
 184         ifname = blobmsg_get_string(c);
 185
 186         if ((c = tb[QUERY_QUESTION]))
 187                 question = blobmsg_get_string(c);
 188
 189         if ((c = tb[QUERY_TYPE]))
 190                 type = blobmsg_get_u32(c);
 191
 192         struct interface *iface_v4 = interface_get(ifname, 0, 1);
 193         struct interface *iface_v6 = interface_get(ifname, 1, 1);
 194
 195         if (!iface_v4 && !iface_v6)
 196                 return UBUS_STATUS_NOT_FOUND;
 197
 198         if (!strcmp(method, "query")) {
 199                 if (iface_v4)
 200                         dns_send_question(iface_v4, question, type, 1);
 201
 202                 if (iface_v6)
 203                         dns_send_question(iface_v6, question, type, 1);
 204
 205                 return UBUS_STATUS_OK;
 206         } else if (!strcmp(method, "fetch")) {
 207                 blob_buf_init(&b, 0);
 208                 void *k = blobmsg_open_array(&b, "records");
 209                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 210                 blobmsg_close_array(&b, k);
 211                 ubus_send_reply(ctx, req, b.head);
 212                 return UBUS_STATUS_OK;
 213         } else {
 214                 return UBUS_STATUS_INVALID_ARGUMENT;
 215         }
 216 }
 217
 218
 219 static const struct ubus_method umdns_methods[] = {
 220         UBUS_METHOD("set_config", umdns_set_config, config_policy),
 221         UBUS_METHOD("query", umdns_query, query_policy),
 222         UBUS_METHOD("fetch", umdns_query, query_policy),
 223         UBUS_METHOD_NOARG("update", umdns_update),
 224         UBUS_METHOD_NOARG("browse", umdns_browse),
 225         UBUS_METHOD_NOARG("hosts", umdns_hosts),
 226         UBUS_METHOD_NOARG("reload", umdns_reload),
 227 };
 228
 229 static struct ubus_object_type umdns_object_type =
 230         UBUS_OBJECT_TYPE("umdns", umdns_methods);
 231
 232 static struct ubus_object umdns_object = {
 233         .name = "umdns",
 234         .type = &umdns_object_type,
 235         .methods = umdns_methods,
 236         .n_methods = ARRAY_SIZE(umdns_methods),
 237 };
 238
 239 static void
 240 ubus_connect_handler(struct ubus_context *ctx)
 241 {
 242         int ret;
 243
 244         ret = ubus_add_object(ctx, &umdns_object);
 245         if (ret)
 246                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 247 }
 248
 249 void
 250 ubus_startup(void)
 251 {
 252         conn.cb = ubus_connect_handler;
 253         ubus_auto_connect(&conn);
 254 }
 255
 256 int ubus_service_list(ubus_data_handler_t cb)
 257 {
 258         uint32_t id;
 259         int ret;
 260
 261         blob_buf_init(&b, 0);
 262         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 263         if (ret)
 264                 return ret;
 265
 266         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 267 }