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 static int
 123 umdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
 124                 struct ubus_request_data *req, const char *method,
 125                 struct blob_attr *msg)
 126 {
 127         struct cache_record *prev = NULL;
 128         struct cache_record *r;
 129         void *c;
 130
 131         blob_buf_init(&b, 0);
 132         avl_for_each_element(&records, r, avl) {
 133                 if (r->type != TYPE_A && r->type != TYPE_AAAA)
 134                         continue;
 135                 /* Query each domain just once */
 136                 if (!prev || strcmp(r->record, prev->record)) {
 137                         c = blobmsg_open_table(&b, r->record);
 138                         cache_dump_records(&b, r->record, false, NULL);
 139                         blobmsg_close_table(&b, c);
 140                 }
 141                 prev = r;
 142         }
 143         ubus_send_reply(ctx, req, b.head);
 144
 145         return UBUS_STATUS_OK;
 146 }
 147
 148 enum {
 149         CFG_INTERFACES,
 150         CFG_KEEP,
 151         CFG_MAX
 152 };
 153
 154 static const struct blobmsg_policy config_policy[] = {
 155         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 156         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 157 };
 158
 159 static int
 160 umdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 161                     struct ubus_request_data *req, const char *method,
 162                     struct blob_attr *msg)
 163 {
 164         struct blob_attr *data[CFG_MAX], *cur;
 165         int rem, keep = false;
 166
 167         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 168         if (!data[CFG_INTERFACES])
 169                 return UBUS_STATUS_INVALID_ARGUMENT;
 170
 171         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 172                 return UBUS_STATUS_INVALID_ARGUMENT;
 173
 174         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 175         if (!keep) {
 176                 vlist_update(&interfaces);
 177                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 178         }
 179
 180         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 181                 interface_add(blobmsg_data(cur));
 182
 183         if (!keep)
 184                 vlist_flush(&interfaces);
 185
 186         return 0;
 187 }
 188
 189 enum query_attr {
 190         QUERY_QUESTION,
 191         QUERY_IFACE,
 192         QUERY_TYPE,
 193         QUERY_MAX
 194 };
 195
 196 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 197         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 198         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 199         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 200 };
 201
 202 static int
 203 umdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 204                     struct ubus_request_data *req, const char *method,
 205                     struct blob_attr *msg)
 206 {
 207         struct blob_attr *tb[QUERY_MAX], *c;
 208         const char *question = C_DNS_SD;
 209         const char *ifname;
 210         int type = TYPE_ANY;
 211
 212         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 213
 214         if (!(c = tb[QUERY_IFACE]))
 215                 return UBUS_STATUS_INVALID_ARGUMENT;
 216
 217         ifname = blobmsg_get_string(c);
 218
 219         if ((c = tb[QUERY_QUESTION]))
 220                 question = blobmsg_get_string(c);
 221
 222         if ((c = tb[QUERY_TYPE]))
 223                 type = blobmsg_get_u32(c);
 224
 225         struct interface *iface_v4 = interface_get(ifname, SOCK_MC_IPV4);
 226         struct interface *iface_v6 = interface_get(ifname, SOCK_MC_IPV6);
 227
 228         if (!iface_v4 && !iface_v6)
 229                 return UBUS_STATUS_NOT_FOUND;
 230
 231         if (!strcmp(method, "query")) {
 232                 if (iface_v4)
 233                         dns_send_question(iface_v4, NULL, question, type, 1);
 234
 235                 if (iface_v6)
 236                         dns_send_question(iface_v6, NULL, question, type, 1);
 237
 238                 return UBUS_STATUS_OK;
 239         } else if (!strcmp(method, "fetch")) {
 240                 blob_buf_init(&b, 0);
 241                 void *k = blobmsg_open_array(&b, "records");
 242                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 243                 blobmsg_close_array(&b, k);
 244                 ubus_send_reply(ctx, req, b.head);
 245                 return UBUS_STATUS_OK;
 246         } else {
 247                 return UBUS_STATUS_INVALID_ARGUMENT;
 248         }
 249 }
 250
 251
 252 static const struct ubus_method umdns_methods[] = {
 253         UBUS_METHOD("set_config", umdns_set_config, config_policy),
 254         UBUS_METHOD("query", umdns_query, query_policy),
 255         UBUS_METHOD("fetch", umdns_query, query_policy),
 256         UBUS_METHOD("browse", umdns_browse, browse_policy),
 257         UBUS_METHOD_NOARG("update", umdns_update),
 258         UBUS_METHOD_NOARG("hosts", umdns_hosts),
 259         UBUS_METHOD_NOARG("reload", umdns_reload),
 260 };
 261
 262 static struct ubus_object_type umdns_object_type =
 263         UBUS_OBJECT_TYPE("umdns", umdns_methods);
 264
 265 static struct ubus_object umdns_object = {
 266         .name = "umdns",
 267         .type = &umdns_object_type,
 268         .methods = umdns_methods,
 269         .n_methods = ARRAY_SIZE(umdns_methods),
 270 };
 271
 272 static void
 273 ubus_connect_handler(struct ubus_context *ctx)
 274 {
 275         int ret;
 276
 277         ret = ubus_add_object(ctx, &umdns_object);
 278         if (ret)
 279                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 280 }
 281
 282 void
 283 ubus_startup(void)
 284 {
 285         conn.cb = ubus_connect_handler;
 286         ubus_auto_connect(&conn);
 287 }
 288
 289 int ubus_service_list(ubus_data_handler_t cb)
 290 {
 291         uint32_t id;
 292         int ret;
 293
 294         blob_buf_init(&b, 0);
 295         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 296         if (ret)
 297                 return ret;
 298
 299         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 300 }