src/ubus.c

   1 #include <syslog.h>
   2 #include <libubus.h>
   3 #include <libubox/uloop.h>
   4 #include <netinet/in.h>
   5 #include <arpa/inet.h>
   6
   7 #include <libubox/utils.h>
   8
   9 #include "odhcpd.h"
  10 #include "dhcpv6.h"
  11 #include "dhcpv4.h"
  12
  13 static struct ubus_context *ubus = NULL;
  14 static struct ubus_subscriber netifd;
  15 static struct blob_buf b;
  16 static struct blob_attr *dump = NULL;
  17 static uint32_t objid = 0;
  18 static struct ubus_request req_dump = { .list = LIST_HEAD_INIT(req_dump.list) };
  19
  20 static int handle_dhcpv4_leases(struct ubus_context *ctx, _unused struct ubus_object *obj,
  21                 struct ubus_request_data *req, _unused const char *method,
  22                 _unused struct blob_attr *msg)
  23 {
  24         struct interface *iface;
  25         time_t now = odhcpd_time();
  26         void *a;
  27
  28         blob_buf_init(&b, 0);
  29         a = blobmsg_open_table(&b, "device");
  30
  31         avl_for_each_element(&interfaces, iface, avl) {
  32                 if (iface->dhcpv4 != MODE_SERVER)
  33                         continue;
  34
  35                 void *i = blobmsg_open_table(&b, iface->ifname);
  36                 void *j = blobmsg_open_array(&b, "leases");
  37
  38                 struct dhcp_assignment *c;
  39                 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
  40                         if (!INFINITE_VALID(c->valid_until) && c->valid_until < now)
  41                                 continue;
  42
  43                         void *m, *l = blobmsg_open_table(&b, NULL);
  44                         char *buf = blobmsg_alloc_string_buffer(&b, "mac", 13);
  45
  46                         odhcpd_hexlify(buf, c->hwaddr, sizeof(c->hwaddr));
  47                         blobmsg_add_string_buffer(&b);
  48
  49                         blobmsg_add_string(&b, "hostname", (c->hostname) ? c->hostname : "");
  50                         blobmsg_add_u8(&b, "accept-reconf-nonce", c->accept_fr_nonce);
  51
  52                         if (c->reqopts) {
  53                                 int opt = 0;
  54                                 int chars = 0;
  55                                 buf = blobmsg_alloc_string_buffer(&b, "reqopts", strlen(c->reqopts) * 4 + 1);
  56                                 for(; c->reqopts[opt]; opt++)
  57                                         chars += snprintf(buf + chars, 6, "%u,", (uint8_t)c->reqopts[opt]);
  58                                 buf[chars - 1] = '\0';
  59                                 blobmsg_add_string_buffer(&b);
  60                         }
  61
  62                         m = blobmsg_open_array(&b, "flags");
  63                         if (c->flags & OAF_BOUND)
  64                                 blobmsg_add_string(&b, NULL, "bound");
  65
  66                         if (c->flags & OAF_STATIC)
  67                                 blobmsg_add_string(&b, NULL, "static");
  68
  69                         if (c->flags & OAF_BROKEN_HOSTNAME)
  70                                 blobmsg_add_string(&b, NULL, "broken-hostname");
  71                         blobmsg_close_array(&b, m);
  72
  73                         buf = blobmsg_alloc_string_buffer(&b, "address", INET_ADDRSTRLEN);
  74                         struct in_addr addr = {.s_addr = c->addr};
  75                         inet_ntop(AF_INET, &addr, buf, INET_ADDRSTRLEN);
  76                         blobmsg_add_string_buffer(&b);
  77
  78                         blobmsg_add_u32(&b, "valid", INFINITE_VALID(c->valid_until) ?
  79                                                 (uint32_t)-1 : (uint32_t)(c->valid_until - now));
  80
  81                         blobmsg_close_table(&b, l);
  82                 }
  83
  84                 blobmsg_close_array(&b, j);
  85                 blobmsg_close_table(&b, i);
  86         }
  87
  88         blobmsg_close_table(&b, a);
  89         ubus_send_reply(ctx, req, b.head);
  90
  91         return 0;
  92 }
  93
  94 static void dhcpv6_blobmsg_ia_addr(struct in6_addr *addr, int prefix, uint32_t pref,
  95                                         uint32_t valid, _unused void *arg)
  96 {
  97         void *a = blobmsg_open_table(&b, NULL);
  98         char *buf = blobmsg_alloc_string_buffer(&b, "address", INET6_ADDRSTRLEN);
  99
 100         inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);
 101         blobmsg_add_string_buffer(&b);
 102         blobmsg_add_u32(&b, "preferred-lifetime",
 103                         pref == UINT32_MAX ? (uint32_t)-1 : pref);
 104         blobmsg_add_u32(&b, "valid-lifetime",
 105                         valid == UINT32_MAX ? (uint32_t)-1 : valid);
 106
 107         if (prefix != 128)
 108                 blobmsg_add_u32(&b, "prefix-length", prefix);
 109
 110         blobmsg_close_table(&b, a);
 111 }
 112
 113 static int handle_dhcpv6_leases(_unused struct ubus_context *ctx, _unused struct ubus_object *obj,
 114                 _unused struct ubus_request_data *req, _unused const char *method,
 115                 _unused struct blob_attr *msg)
 116 {
 117         struct interface *iface;
 118         time_t now = odhcpd_time();
 119         void *a;
 120
 121         blob_buf_init(&b, 0);
 122         a = blobmsg_open_table(&b, "device");
 123
 124         avl_for_each_element(&interfaces, iface, avl) {
 125                 if (iface->dhcpv6 != MODE_SERVER)
 126                         continue;
 127
 128                 void *i = blobmsg_open_table(&b, iface->ifname);
 129                 void *j = blobmsg_open_array(&b, "leases");
 130
 131                 struct dhcp_assignment *a, *border = list_last_entry(
 132                                 &iface->ia_assignments, struct dhcp_assignment, head);
 133
 134                 list_for_each_entry(a, &iface->ia_assignments, head) {
 135                         if (a == border || (!INFINITE_VALID(a->valid_until) &&
 136                                                 a->valid_until < now))
 137                                 continue;
 138
 139                         void *m, *l = blobmsg_open_table(&b, NULL);
 140                         char *buf = blobmsg_alloc_string_buffer(&b, "duid", 264);
 141
 142                         odhcpd_hexlify(buf, a->clid_data, a->clid_len);
 143                         blobmsg_add_string_buffer(&b);
 144
 145                         blobmsg_add_u32(&b, "iaid", ntohl(a->iaid));
 146                         blobmsg_add_string(&b, "hostname", (a->hostname) ? a->hostname : "");
 147                         blobmsg_add_u8(&b, "accept-reconf", a->accept_reconf);
 148                         blobmsg_add_u32(&b, "assigned", a->assigned);
 149
 150                         m = blobmsg_open_array(&b, "flags");
 151                         if (a->flags & OAF_BOUND)
 152                                 blobmsg_add_string(&b, NULL, "bound");
 153
 154                         if (a->flags & OAF_STATIC)
 155                                 blobmsg_add_string(&b, NULL, "static");
 156                         blobmsg_close_array(&b, m);
 157
 158                         m = blobmsg_open_array(&b, a->length == 128 ? "ipv6-addr": "ipv6-prefix");
 159                         dhcpv6_ia_enum_addrs(iface, a, now, dhcpv6_blobmsg_ia_addr, NULL);
 160                         blobmsg_close_table(&b, m);
 161
 162                         blobmsg_add_u32(&b, "valid", INFINITE_VALID(a->valid_until) ?
 163                                                 (uint32_t)-1 : (uint32_t)(a->valid_until - now));
 164
 165                         blobmsg_close_table(&b, l);
 166                 }
 167
 168                 blobmsg_close_array(&b, j);
 169                 blobmsg_close_table(&b, i);
 170         }
 171
 172         blobmsg_close_table(&b, a);
 173         ubus_send_reply(ctx, req, b.head);
 174         return 0;
 175 }
 176
 177
 178 static struct ubus_method main_object_methods[] = {
 179         {.name = "ipv4leases", .handler = handle_dhcpv4_leases},
 180         {.name = "ipv6leases", .handler = handle_dhcpv6_leases},
 181 };
 182
 183 static struct ubus_object_type main_object_type =
 184                 UBUS_OBJECT_TYPE("dhcp", main_object_methods);
 185
 186 static struct ubus_object main_object = {
 187         .name = "dhcp",
 188         .type = &main_object_type,
 189         .methods = main_object_methods,
 190         .n_methods = ARRAY_SIZE(main_object_methods),
 191 };
 192
 193
 194 enum {
 195         DUMP_ATTR_INTERFACE,
 196         DUMP_ATTR_MAX
 197 };
 198
 199 static const struct blobmsg_policy dump_attrs[DUMP_ATTR_MAX] = {
 200         [DUMP_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_ARRAY },
 201 };
 202
 203
 204 enum {
 205         IFACE_ATTR_INTERFACE,
 206         IFACE_ATTR_IFNAME,
 207         IFACE_ATTR_UP,
 208         IFACE_ATTR_DATA,
 209         IFACE_ATTR_PREFIX,
 210         IFACE_ATTR_ADDRESS,
 211         IFACE_ATTR_MAX,
 212 };
 213
 214 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
 215         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
 216         [IFACE_ATTR_IFNAME] = { .name = "l3_device", .type = BLOBMSG_TYPE_STRING },
 217         [IFACE_ATTR_UP] = { .name = "up", .type = BLOBMSG_TYPE_BOOL },
 218         [IFACE_ATTR_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 219         [IFACE_ATTR_PREFIX] = { .name = "ipv6-prefix", .type = BLOBMSG_TYPE_ARRAY },
 220         [IFACE_ATTR_ADDRESS] = { .name = "ipv6-address", .type = BLOBMSG_TYPE_ARRAY },
 221 };
 222
 223 static void handle_dump(_unused struct ubus_request *req, _unused int type, struct blob_attr *msg)
 224 {
 225         struct blob_attr *tb[DUMP_ATTR_MAX];
 226         blobmsg_parse(dump_attrs, DUMP_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 227
 228         if (!tb[DUMP_ATTR_INTERFACE])
 229                 return;
 230
 231         free(dump);
 232         dump = blob_memdup(tb[DUMP_ATTR_INTERFACE]);
 233         odhcpd_reload();
 234 }
 235
 236
 237 static void update_netifd(bool subscribe)
 238 {
 239         if (subscribe)
 240                 ubus_subscribe(ubus, &netifd, objid);
 241
 242         ubus_abort_request(ubus, &req_dump);
 243         blob_buf_init(&b, 0);
 244
 245         if (!ubus_invoke_async(ubus, objid, "dump", b.head, &req_dump)) {
 246                 req_dump.data_cb = handle_dump;
 247                 ubus_complete_request_async(ubus, &req_dump);
 248         }
 249 }
 250
 251
 252 static int handle_update(_unused struct ubus_context *ctx, _unused struct ubus_object *obj,
 253                 _unused struct ubus_request_data *req, _unused const char *method,
 254                 struct blob_attr *msg)
 255 {
 256         struct blob_attr *tb[IFACE_ATTR_MAX];
 257         struct interface *c;
 258         bool update = true;
 259
 260         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 261         const char *interface = (tb[IFACE_ATTR_INTERFACE]) ?
 262                         blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]) : "";
 263
 264         avl_for_each_element(&interfaces, c, avl) {
 265                 if (!strcmp(interface, c->name) && c->ignore) {
 266                         update = false;
 267                         break;
 268                 }
 269         }
 270
 271         if (update)
 272                 update_netifd(false);
 273
 274         return 0;
 275 }
 276
 277
 278 void ubus_apply_network(void)
 279 {
 280         struct blob_attr *a;
 281         unsigned rem;
 282
 283         if (!dump)
 284                 return;
 285
 286         blobmsg_for_each_attr(a, dump, rem) {
 287                 struct blob_attr *tb[IFACE_ATTR_MAX];
 288                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(a), blobmsg_data_len(a));
 289
 290                 if (!tb[IFACE_ATTR_INTERFACE] || !tb[IFACE_ATTR_DATA])
 291                         continue;
 292
 293                 const char *interface = (tb[IFACE_ATTR_INTERFACE]) ?
 294                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]) : "";
 295
 296                 bool matched = false;
 297                 struct interface *c, *tmp;
 298                 avl_for_each_element_safe(&interfaces, c, avl, tmp) {
 299                         char *f = memmem(c->upstream, c->upstream_len,
 300                                         interface, strlen(interface) + 1);
 301                         bool cmatched = !strcmp(interface, c->name);
 302                         matched |= cmatched;
 303
 304                         if (!cmatched && (!c->upstream_len || !f || (f != c->upstream && f[-1] != 0)))
 305                                 continue;
 306
 307                         if (!c->ignore)
 308                                 config_parse_interface(blobmsg_data(tb[IFACE_ATTR_DATA]),
 309                                                 blobmsg_data_len(tb[IFACE_ATTR_DATA]), c->name, false);
 310                 }
 311
 312                 if (!matched)
 313                         config_parse_interface(blobmsg_data(tb[IFACE_ATTR_DATA]),
 314                                         blobmsg_data_len(tb[IFACE_ATTR_DATA]), interface, false);
 315         }
 316 }
 317
 318
 319 enum {
 320         OBJ_ATTR_ID,
 321         OBJ_ATTR_PATH,
 322         OBJ_ATTR_MAX
 323 };
 324
 325 static const struct blobmsg_policy obj_attrs[OBJ_ATTR_MAX] = {
 326         [OBJ_ATTR_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 327         [OBJ_ATTR_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 328 };
 329
 330 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac,
 331                 const size_t mlen, const struct in_addr *addr, const char *name,
 332                 const char *interface)
 333 {
 334         if (!ubus || !main_object.has_subscribers)
 335                 return;
 336
 337         blob_buf_init(&b, 0);
 338         if (mac)
 339                 blobmsg_add_string(&b, "mac", odhcpd_print_mac(mac, mlen));
 340         if (addr)
 341                 blobmsg_add_string(&b, "ip", inet_ntoa(*addr));
 342         if (name)
 343                 blobmsg_add_string(&b, "name", name);
 344         if (interface)
 345                 blobmsg_add_string(&b, "interface", interface);
 346
 347         ubus_notify(ubus, &main_object, type, b.head, -1);
 348 }
 349
 350 static void handle_event(_unused struct ubus_context *ctx, _unused struct ubus_event_handler *ev,
 351                 _unused const char *type, struct blob_attr *msg)
 352 {
 353         struct blob_attr *tb[OBJ_ATTR_MAX];
 354         blobmsg_parse(obj_attrs, OBJ_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 355
 356         if (!tb[OBJ_ATTR_ID] || !tb[OBJ_ATTR_PATH])
 357                 return;
 358
 359         if (strcmp(blobmsg_get_string(tb[OBJ_ATTR_PATH]), "network.interface"))
 360                 return;
 361
 362         objid = blobmsg_get_u32(tb[OBJ_ATTR_ID]);
 363         update_netifd(true);
 364 }
 365
 366 static struct ubus_event_handler event_handler = { .cb = handle_event };
 367
 368
 369 const char* ubus_get_ifname(const char *name)
 370 {
 371         struct blob_attr *c;
 372         unsigned rem;
 373
 374         if (!dump)
 375                 return NULL;
 376
 377         blobmsg_for_each_attr(c, dump, rem) {
 378                 struct blob_attr *tb[IFACE_ATTR_MAX];
 379                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 380
 381                 if (!tb[IFACE_ATTR_INTERFACE] || strcmp(name,
 382                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])))
 383                         continue;
 384
 385                 if (tb[IFACE_ATTR_IFNAME])
 386                         return blobmsg_get_string(tb[IFACE_ATTR_IFNAME]);
 387         }
 388
 389         return NULL;
 390 }
 391
 392
 393 bool ubus_has_prefix(const char *name, const char *ifname)
 394 {
 395         struct blob_attr *c, *cur;
 396         unsigned rem;
 397
 398         if (!dump)
 399                 return NULL;
 400
 401         blobmsg_for_each_attr(c, dump, rem) {
 402                 struct blob_attr *tb[IFACE_ATTR_MAX];
 403                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 404
 405                 if (!tb[IFACE_ATTR_INTERFACE] || !tb[IFACE_ATTR_IFNAME])
 406                         continue;
 407
 408                 if (strcmp(name, blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])) ||
 409                                 strcmp(ifname, blobmsg_get_string(tb[IFACE_ATTR_IFNAME])))
 410                         continue;
 411
 412                 if ((cur = tb[IFACE_ATTR_PREFIX])) {
 413                         if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY || !blobmsg_check_attr(cur, false))
 414                                 continue;
 415
 416                         struct blob_attr *d;
 417                         unsigned drem;
 418                         blobmsg_for_each_attr(d, cur, drem) {
 419                                 return true;
 420                         }
 421                 }
 422         }
 423
 424         return false;
 425 }
 426
 427
 428 int ubus_init(void)
 429 {
 430         if (!(ubus = ubus_connect(NULL))) {
 431                 syslog(LOG_ERR, "Unable to connect to ubus: %m");
 432                 return -1;
 433         }
 434
 435         netifd.cb = handle_update;
 436         ubus_register_subscriber(ubus, &netifd);
 437
 438         ubus_add_uloop(ubus);
 439         ubus_add_object(ubus, &main_object);
 440         ubus_register_event_handler(ubus, &event_handler, "ubus.object.add");
 441         if (!ubus_lookup_id(ubus, "network.interface", &objid))
 442                 update_netifd(true);
 443
 444         return 0;
 445 }
 446