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