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 mdns_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 mdns_scan(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_scan();
  47         return 0;
  48 }
  49
  50 static int
  51 mdns_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 (*((char *) s->avl.key) != '_')
  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", (const char *) 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 mdns_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         char *buffer = (char *) mdns_buf;
 101         void *c;
 102
 103         blob_buf_init(&b, 0);
 104         avl_for_each_element(&services, s, avl) {
 105                 char *local;
 106                 if (*((char *) s->avl.key) == '_')
 107                         continue;
 108                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->entry);
 109                 local = strstr(buffer, "._");
 110                 if (local)
 111                         *local = '\0';
 112                 c = blobmsg_open_table(&b, buffer);
 113                 strncat(buffer, ".local", MAX_NAME_LEN);
 114                 cache_dump_records(&b, buffer);
 115                 cache_dump_records(&b, s->entry);
 116                 blobmsg_close_table(&b, c);
 117         }
 118         ubus_send_reply(ctx, req, b.head);
 119
 120         return UBUS_STATUS_OK;
 121 }
 122
 123 enum {
 124         CFG_INTERFACES,
 125         CFG_KEEP,
 126         CFG_MAX
 127 };
 128
 129 static const struct blobmsg_policy config_policy[] = {
 130         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 131         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 132 };
 133
 134 static int
 135 mdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 136                     struct ubus_request_data *req, const char *method,
 137                     struct blob_attr *msg)
 138 {
 139         struct blob_attr *data[CFG_MAX], *cur;
 140         int rem, keep = false;
 141
 142         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 143         if (!data[CFG_INTERFACES])
 144                 return UBUS_STATUS_INVALID_ARGUMENT;
 145
 146         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 147                 return UBUS_STATUS_INVALID_ARGUMENT;
 148
 149         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 150         if (!keep) {
 151                 vlist_update(&interfaces);
 152                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 153         }
 154
 155         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 156                 interface_add(blobmsg_data(cur));
 157
 158         if (!keep)
 159                 vlist_flush(&interfaces);
 160
 161         return 0;
 162 }
 163
 164 enum query_attr {
 165         QUERY_QUESTION,
 166         QUERY_IFACE,
 167         QUERY_TYPE,
 168         QUERY_MAX
 169 };
 170
 171 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 172         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 173         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 174         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 175 };
 176
 177 static int
 178 mdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 179                     struct ubus_request_data *req, const char *method,
 180                     struct blob_attr *msg)
 181 {
 182         struct blob_attr *tb[QUERY_MAX], *c;
 183         const char *question = "_services._dns-sd._udp.local";
 184         const char *ifname;
 185         int type = TYPE_ANY;
 186
 187         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 188
 189         if (!(c = tb[QUERY_IFACE]))
 190                 return UBUS_STATUS_INVALID_ARGUMENT;
 191
 192         ifname = blobmsg_get_string(c);
 193
 194         if ((c = tb[QUERY_QUESTION]))
 195                 question = blobmsg_get_string(c);
 196
 197         if ((c = tb[QUERY_TYPE]))
 198                 type = blobmsg_get_u32(c);
 199
 200         struct interface *iface_v4 = interface_get(ifname, 0, 1);
 201         struct interface *iface_v6 = interface_get(ifname, 1, 1);
 202
 203         if (!iface_v4 && !iface_v6)
 204                 return UBUS_STATUS_NOT_FOUND;
 205
 206         if (!strcmp(method, "query")) {
 207                 if (iface_v4)
 208                         dns_send_question(iface_v4, question, type, 1);
 209
 210                 if (iface_v6)
 211                         dns_send_question(iface_v6, question, type, 1);
 212
 213                 return UBUS_STATUS_OK;
 214         } else if (!strcmp(method, "fetch")) {
 215                 blob_buf_init(&b, 0);
 216                 void *k = blobmsg_open_array(&b, "records");
 217                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 218                 blobmsg_close_array(&b, k);
 219                 ubus_send_reply(ctx, req, b.head);
 220                 return UBUS_STATUS_OK;
 221         } else {
 222                 return UBUS_STATUS_INVALID_ARGUMENT;
 223         }
 224 }
 225
 226
 227 static const struct ubus_method mdns_methods[] = {
 228         UBUS_METHOD("set_config", mdns_set_config, config_policy),
 229         UBUS_METHOD("query", mdns_query, query_policy),
 230         UBUS_METHOD("fetch", mdns_query, query_policy),
 231         UBUS_METHOD_NOARG("scan", mdns_scan),
 232         UBUS_METHOD_NOARG("browse", mdns_browse),
 233         UBUS_METHOD_NOARG("hosts", mdns_hosts),
 234         UBUS_METHOD_NOARG("reload", mdns_reload),
 235 };
 236
 237 static struct ubus_object_type mdns_object_type =
 238         UBUS_OBJECT_TYPE("mdns", mdns_methods);
 239
 240 static struct ubus_object mdns_object = {
 241         .name = "mdns",
 242         .type = &mdns_object_type,
 243         .methods = mdns_methods,
 244         .n_methods = ARRAY_SIZE(mdns_methods),
 245 };
 246
 247 static void
 248 ubus_connect_handler(struct ubus_context *ctx)
 249 {
 250         int ret;
 251
 252         ret = ubus_add_object(ctx, &mdns_object);
 253         if (ret)
 254                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 255 }
 256
 257 void
 258 ubus_startup(void)
 259 {
 260         conn.cb = ubus_connect_handler;
 261         ubus_auto_connect(&conn);
 262 }
 263
 264 int ubus_service_list(ubus_data_handler_t cb)
 265 {
 266         uint32_t id;
 267         int ret;
 268
 269         blob_buf_init(&b, 0);
 270         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 271         if (ret)
 272                 return ret;
 273
 274         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 275 }