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_MAX
  54 };
  55
  56 static const struct blobmsg_policy browse_policy[] = {
  57         [BROWSE_SERVICE]        = { "service", BLOBMSG_TYPE_STRING },
  58         [BROWSE_ARRAY]          = { "array", BLOBMSG_TYPE_BOOL },
  59 };
  60
  61 static int
  62 umdns_browse(struct ubus_context *ctx, struct ubus_object *obj,
  63                 struct ubus_request_data *req, const char *method,
  64                 struct blob_attr *msg)
  65 {
  66         struct cache_service *s, *q;
  67         char *buffer = (char *) mdns_buf;
  68         struct blob_attr *data[BROWSE_MAX];
  69         void *c1 = NULL, *c2;
  70         char *service = NULL;
  71         int array = 0;
  72
  73         blobmsg_parse(browse_policy, BROWSE_MAX, data, blob_data(msg), blob_len(msg));
  74         if (data[BROWSE_SERVICE])
  75                 service = blobmsg_get_string(data[BROWSE_SERVICE]);
  76         if (data[BROWSE_ARRAY])
  77                 array = blobmsg_get_u8(data[BROWSE_ARRAY]);
  78
  79         blob_buf_init(&b, 0);
  80         avl_for_each_element(&services, s, avl) {
  81                 char *local;
  82
  83                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->avl.key);
  84                 local = strstr(buffer, ".local");
  85                 if (local)
  86                         *local = '\0';
  87                 if (!strcmp(buffer, "_tcp") || !strcmp(buffer, "_udp"))
  88                         continue;
  89                 if (service && strcmp(buffer, service))
  90                         continue;
  91                 if (!c1) {
  92                         c1 = blobmsg_open_table(&b, buffer);
  93                 }
  94                 snprintf(buffer, MAX_NAME_LEN, "%s", s->entry);
  95                 local = strstr(buffer, "._");
  96                 if (local)
  97                         *local = '\0';
  98                 c2 = blobmsg_open_table(&b, buffer);
  99                 strncat(buffer, ".local", MAX_NAME_LEN);
 100                 blobmsg_add_string(&b, "iface", s->iface->name);
 101                 cache_dump_records(&b, buffer, array);
 102                 cache_dump_records(&b, s->entry, array);
 103                 blobmsg_close_table(&b, c2);
 104                 q = avl_next_element(s, avl);
 105                 if (!q || avl_is_last(&services, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
 106                         blobmsg_close_table(&b, c1);
 107                         c1 = NULL;
 108                 }
 109         }
 110         ubus_send_reply(ctx, req, b.head);
 111
 112         return UBUS_STATUS_OK;
 113 }
 114
 115 static int
 116 umdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
 117                 struct ubus_request_data *req, const char *method,
 118                 struct blob_attr *msg)
 119 {
 120         struct cache_record *prev = NULL;
 121         struct cache_record *r;
 122         void *c;
 123
 124         blob_buf_init(&b, 0);
 125         avl_for_each_element(&records, r, avl) {
 126                 if (r->type != TYPE_A && r->type != TYPE_AAAA)
 127                         continue;
 128                 /* Query each domain just once */
 129                 if (!prev || strcmp(r->record, prev->record)) {
 130                         c = blobmsg_open_table(&b, r->record);
 131                         cache_dump_records(&b, r->record, false);
 132                         blobmsg_close_table(&b, c);
 133                 }
 134                 prev = r;
 135         }
 136         ubus_send_reply(ctx, req, b.head);
 137
 138         return UBUS_STATUS_OK;
 139 }
 140
 141 enum {
 142         CFG_INTERFACES,
 143         CFG_KEEP,
 144         CFG_MAX
 145 };
 146
 147 static const struct blobmsg_policy config_policy[] = {
 148         [CFG_INTERFACES]        = { "interfaces", BLOBMSG_TYPE_ARRAY },
 149         [CFG_KEEP]              = { "keep", BLOBMSG_TYPE_BOOL },
 150 };
 151
 152 static int
 153 umdns_set_config(struct ubus_context *ctx, struct ubus_object *obj,
 154                     struct ubus_request_data *req, const char *method,
 155                     struct blob_attr *msg)
 156 {
 157         struct blob_attr *data[CFG_MAX], *cur;
 158         int rem, keep = false;
 159
 160         blobmsg_parse(config_policy, CFG_MAX, data, blob_data(msg), blob_len(msg));
 161         if (!data[CFG_INTERFACES])
 162                 return UBUS_STATUS_INVALID_ARGUMENT;
 163
 164         if (!blobmsg_check_attr_list(data[CFG_INTERFACES], BLOBMSG_TYPE_STRING))
 165                 return UBUS_STATUS_INVALID_ARGUMENT;
 166
 167         keep = data[CFG_KEEP] && blobmsg_get_bool(data[CFG_KEEP]);
 168         if (!keep) {
 169                 vlist_update(&interfaces);
 170                 ubus_notify(ctx, obj, "set_config", NULL, 1000);
 171         }
 172
 173         blobmsg_for_each_attr(cur, data[CFG_INTERFACES], rem)
 174                 interface_add(blobmsg_data(cur));
 175
 176         if (!keep)
 177                 vlist_flush(&interfaces);
 178
 179         return 0;
 180 }
 181
 182 enum query_attr {
 183         QUERY_QUESTION,
 184         QUERY_IFACE,
 185         QUERY_TYPE,
 186         QUERY_MAX
 187 };
 188
 189 static const struct blobmsg_policy query_policy[QUERY_MAX] = {
 190         [QUERY_QUESTION]= { "question", BLOBMSG_TYPE_STRING },
 191         [QUERY_IFACE]   = { "interface", BLOBMSG_TYPE_STRING },
 192         [QUERY_TYPE]    = { "type", BLOBMSG_TYPE_INT32 },
 193 };
 194
 195 static int
 196 umdns_query(struct ubus_context *ctx, struct ubus_object *obj,
 197                     struct ubus_request_data *req, const char *method,
 198                     struct blob_attr *msg)
 199 {
 200         struct blob_attr *tb[QUERY_MAX], *c;
 201         const char *question = C_DNS_SD;
 202         const char *ifname;
 203         int type = TYPE_ANY;
 204
 205         blobmsg_parse(query_policy, QUERY_MAX, tb, blob_data(msg), blob_len(msg));
 206
 207         if (!(c = tb[QUERY_IFACE]))
 208                 return UBUS_STATUS_INVALID_ARGUMENT;
 209
 210         ifname = blobmsg_get_string(c);
 211
 212         if ((c = tb[QUERY_QUESTION]))
 213                 question = blobmsg_get_string(c);
 214
 215         if ((c = tb[QUERY_TYPE]))
 216                 type = blobmsg_get_u32(c);
 217
 218         struct interface *iface_v4 = interface_get(ifname, 0, 1);
 219         struct interface *iface_v6 = interface_get(ifname, 1, 1);
 220
 221         if (!iface_v4 && !iface_v6)
 222                 return UBUS_STATUS_NOT_FOUND;
 223
 224         if (!strcmp(method, "query")) {
 225                 if (iface_v4)
 226                         dns_send_question(iface_v4, NULL, question, type, 1);
 227
 228                 if (iface_v6)
 229                         dns_send_question(iface_v6, NULL, question, type, 1);
 230
 231                 return UBUS_STATUS_OK;
 232         } else if (!strcmp(method, "fetch")) {
 233                 blob_buf_init(&b, 0);
 234                 void *k = blobmsg_open_array(&b, "records");
 235                 cache_dump_recursive(&b, question, type, iface_v4 ? iface_v4 : iface_v6);
 236                 blobmsg_close_array(&b, k);
 237                 ubus_send_reply(ctx, req, b.head);
 238                 return UBUS_STATUS_OK;
 239         } else {
 240                 return UBUS_STATUS_INVALID_ARGUMENT;
 241         }
 242 }
 243
 244
 245 static const struct ubus_method umdns_methods[] = {
 246         UBUS_METHOD("set_config", umdns_set_config, config_policy),
 247         UBUS_METHOD("query", umdns_query, query_policy),
 248         UBUS_METHOD("fetch", umdns_query, query_policy),
 249         UBUS_METHOD("browse", umdns_browse, browse_policy),
 250         UBUS_METHOD_NOARG("update", umdns_update),
 251         UBUS_METHOD_NOARG("hosts", umdns_hosts),
 252         UBUS_METHOD_NOARG("reload", umdns_reload),
 253 };
 254
 255 static struct ubus_object_type umdns_object_type =
 256         UBUS_OBJECT_TYPE("umdns", umdns_methods);
 257
 258 static struct ubus_object umdns_object = {
 259         .name = "umdns",
 260         .type = &umdns_object_type,
 261         .methods = umdns_methods,
 262         .n_methods = ARRAY_SIZE(umdns_methods),
 263 };
 264
 265 static void
 266 ubus_connect_handler(struct ubus_context *ctx)
 267 {
 268         int ret;
 269
 270         ret = ubus_add_object(ctx, &umdns_object);
 271         if (ret)
 272                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 273 }
 274
 275 void
 276 ubus_startup(void)
 277 {
 278         conn.cb = ubus_connect_handler;
 279         ubus_auto_connect(&conn);
 280 }
 281
 282 int ubus_service_list(ubus_data_handler_t cb)
 283 {
 284         uint32_t id;
 285         int ret;
 286
 287         blob_buf_init(&b, 0);
 288         ret = ubus_lookup_id(&conn.ctx, "service", &id);
 289         if (ret)
 290                 return ret;
 291
 292         return ubus_invoke(&conn.ctx, id, "list", b.head, cb, NULL, 5 * 1000);
 293 }