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