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 "odhcpd.h"
   8 #include "dhcpv6.h"
   9 #include "dhcpv4.h"
  10
  11 static struct ubus_context *ubus = NULL;
  12 static struct ubus_subscriber netifd;
  13 static struct blob_buf b;
  14 static struct blob_attr *dump = NULL;
  15 static uint32_t objid = 0;
  16 static struct ubus_request req_dump = { .list = LIST_HEAD_INIT(req_dump.list) };
  17
  18 static int handle_dhcpv4_leases(struct ubus_context *ctx, _unused struct ubus_object *obj,
  19                 struct ubus_request_data *req, _unused const char *method,
  20                 _unused struct blob_attr *msg)
  21 {
  22         struct interface *iface;
  23         time_t now = odhcpd_time();
  24         void *a;
  25
  26         blob_buf_init(&b, 0);
  27         a = blobmsg_open_table(&b, "device");
  28
  29         list_for_each_entry(iface, &interfaces, head) {
  30                 if (iface->dhcpv4 != MODE_SERVER || iface->dhcpv4_assignments.next == NULL)
  31                         continue;
  32
  33                 void *i = blobmsg_open_table(&b, iface->ifname);
  34                 void *j = blobmsg_open_array(&b, "leases");
  35
  36                 struct dhcpv4_assignment *c;
  37                 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
  38                         if (!INFINITE_VALID(c->valid_until) && c->valid_until < now)
  39                                 continue;
  40
  41                         void *m, *l = blobmsg_open_table(&b, NULL);
  42                         char *buf = blobmsg_alloc_string_buffer(&b, "mac", 13);
  43
  44                         odhcpd_hexlify(buf, c->hwaddr, sizeof(c->hwaddr));
  45                         blobmsg_add_string_buffer(&b);
  46
  47                         blobmsg_add_string(&b, "hostname", (c->hostname) ? c->hostname : "");
  48                         blobmsg_add_u8(&b, "accept-reconf-nonce", c->accept_fr_nonce);
  49
  50                         m = blobmsg_open_array(&b, "flags");
  51                         if (c->flags & OAF_BOUND)
  52                                 blobmsg_add_string(&b, NULL, "bound");
  53
  54                         if (c->flags & OAF_STATIC)
  55                                 blobmsg_add_string(&b, NULL, "static");
  56                         blobmsg_close_array(&b, m);
  57
  58                         buf = blobmsg_alloc_string_buffer(&b, "address", INET_ADDRSTRLEN);
  59                         struct in_addr addr = {.s_addr = c->addr};
  60                         inet_ntop(AF_INET, &addr, buf, INET_ADDRSTRLEN);
  61                         blobmsg_add_string_buffer(&b);
  62
  63                         blobmsg_add_u32(&b, "valid", INFINITE_VALID(c->valid_until) ?
  64                                                 (uint32_t)-1 : (uint32_t)(c->valid_until - now));
  65
  66                         blobmsg_close_table(&b, l);
  67                 }
  68
  69                 blobmsg_close_array(&b, j);
  70                 blobmsg_close_table(&b, i);
  71         }
  72
  73         blobmsg_close_table(&b, a);
  74         ubus_send_reply(ctx, req, b.head);
  75
  76         return 0;
  77 }
  78
  79 static void dhcpv6_blobmsg_ia_addr(struct in6_addr *addr, int prefix, uint32_t pref,
  80                                         uint32_t valid, _unused void *arg)
  81 {
  82         void *a = blobmsg_open_table(&b, NULL);
  83         char *buf = blobmsg_alloc_string_buffer(&b, "address", INET6_ADDRSTRLEN);
  84
  85         inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);
  86         blobmsg_add_string_buffer(&b);
  87         blobmsg_add_u32(&b, "preferred-lifetime",
  88                         pref == UINT32_MAX ? (uint32_t)-1 : pref);
  89         blobmsg_add_u32(&b, "valid-lifetime",
  90                         valid == UINT32_MAX ? (uint32_t)-1 : valid);
  91
  92         if (prefix != 128)
  93                 blobmsg_add_u32(&b, "prefix-length", prefix);
  94
  95         blobmsg_close_table(&b, a);
  96 }
  97
  98 static int handle_dhcpv6_leases(_unused struct ubus_context *ctx, _unused struct ubus_object *obj,
  99                 _unused struct ubus_request_data *req, _unused const char *method,
 100                 _unused struct blob_attr *msg)
 101 {
 102         struct interface *iface;
 103         time_t now = odhcpd_time();
 104         void *a;
 105
 106         blob_buf_init(&b, 0);
 107         a = blobmsg_open_table(&b, "device");
 108
 109         list_for_each_entry(iface, &interfaces, head) {
 110                 if (iface->dhcpv6 != MODE_SERVER || iface->ia_assignments.next == NULL)
 111                         continue;
 112
 113                 void *i = blobmsg_open_table(&b, iface->ifname);
 114                 void *j = blobmsg_open_array(&b, "leases");
 115
 116                 struct dhcpv6_assignment *a, *border = list_last_entry(
 117                                 &iface->ia_assignments, struct dhcpv6_assignment, head);
 118
 119                 list_for_each_entry(a, &iface->ia_assignments, head) {
 120                         if (a == border || (!INFINITE_VALID(a->valid_until) &&
 121                                                 a->valid_until < now))
 122                                 continue;
 123
 124                         void *m, *l = blobmsg_open_table(&b, NULL);
 125                         char *buf = blobmsg_alloc_string_buffer(&b, "duid", 264);
 126
 127                         odhcpd_hexlify(buf, a->clid_data, a->clid_len);
 128                         blobmsg_add_string_buffer(&b);
 129
 130                         blobmsg_add_u32(&b, "iaid", ntohl(a->iaid));
 131                         blobmsg_add_string(&b, "hostname", (a->hostname) ? a->hostname : "");
 132                         blobmsg_add_u8(&b, "accept-reconf", a->accept_reconf);
 133                         blobmsg_add_u32(&b, "assigned", a->assigned);
 134
 135                         m = blobmsg_open_array(&b, "flags");
 136                         if (a->flags & OAF_BOUND)
 137                                 blobmsg_add_string(&b, NULL, "bound");
 138
 139                         if (a->flags & OAF_STATIC)
 140                                 blobmsg_add_string(&b, NULL, "static");
 141                         blobmsg_close_array(&b, m);
 142
 143                         m = blobmsg_open_array(&b, a->length == 128 ? "ipv6-addr": "ipv6-prefix");
 144                         dhcpv6_enum_ia_addrs(iface, a, now, dhcpv6_blobmsg_ia_addr, NULL);
 145                         blobmsg_close_table(&b, m);
 146
 147                         blobmsg_add_u32(&b, "valid", INFINITE_VALID(a->valid_until) ?
 148                                                 (uint32_t)-1 : (uint32_t)(a->valid_until - now));
 149
 150                         blobmsg_close_table(&b, l);
 151                 }
 152
 153                 blobmsg_close_array(&b, j);
 154                 blobmsg_close_table(&b, i);
 155         }
 156
 157         blobmsg_close_table(&b, a);
 158         ubus_send_reply(ctx, req, b.head);
 159         return 0;
 160 }
 161
 162
 163 static struct ubus_method main_object_methods[] = {
 164         {.name = "ipv4leases", .handler = handle_dhcpv4_leases},
 165         {.name = "ipv6leases", .handler = handle_dhcpv6_leases},
 166 };
 167
 168 static struct ubus_object_type main_object_type =
 169                 UBUS_OBJECT_TYPE("dhcp", main_object_methods);
 170
 171 static struct ubus_object main_object = {
 172         .name = "dhcp",
 173         .type = &main_object_type,
 174         .methods = main_object_methods,
 175         .n_methods = ARRAY_SIZE(main_object_methods),
 176 };
 177
 178
 179 enum {
 180         DUMP_ATTR_INTERFACE,
 181         DUMP_ATTR_MAX
 182 };
 183
 184 static const struct blobmsg_policy dump_attrs[DUMP_ATTR_MAX] = {
 185         [DUMP_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_ARRAY },
 186 };
 187
 188
 189 enum {
 190         IFACE_ATTR_INTERFACE,
 191         IFACE_ATTR_IFNAME,
 192         IFACE_ATTR_UP,
 193         IFACE_ATTR_DATA,
 194         IFACE_ATTR_PREFIX,
 195         IFACE_ATTR_ADDRESS,
 196         IFACE_ATTR_MAX,
 197 };
 198
 199 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
 200         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
 201         [IFACE_ATTR_IFNAME] = { .name = "l3_device", .type = BLOBMSG_TYPE_STRING },
 202         [IFACE_ATTR_UP] = { .name = "up", .type = BLOBMSG_TYPE_BOOL },
 203         [IFACE_ATTR_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 204         [IFACE_ATTR_PREFIX] = { .name = "ipv6-prefix", .type = BLOBMSG_TYPE_ARRAY },
 205         [IFACE_ATTR_ADDRESS] = { .name = "ipv6-address", .type = BLOBMSG_TYPE_ARRAY },
 206 };
 207
 208 static void handle_dump(_unused struct ubus_request *req, _unused int type, struct blob_attr *msg)
 209 {
 210         struct blob_attr *tb[DUMP_ATTR_MAX];
 211         blobmsg_parse(dump_attrs, DUMP_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 212
 213         if (!tb[DUMP_ATTR_INTERFACE])
 214                 return;
 215
 216         free(dump);
 217         dump = blob_memdup(tb[DUMP_ATTR_INTERFACE]);
 218         odhcpd_reload();
 219 }
 220
 221
 222 static void update_netifd(bool subscribe)
 223 {
 224         if (subscribe)
 225                 ubus_subscribe(ubus, &netifd, objid);
 226
 227         ubus_abort_request(ubus, &req_dump);
 228         blob_buf_init(&b, 0);
 229
 230         if (!ubus_invoke_async(ubus, objid, "dump", b.head, &req_dump)) {
 231                 req_dump.data_cb = handle_dump;
 232                 ubus_complete_request_async(ubus, &req_dump);
 233         }
 234 }
 235
 236
 237 static int handle_update(_unused struct ubus_context *ctx, _unused struct ubus_object *obj,
 238                 _unused struct ubus_request_data *req, _unused const char *method,
 239                 struct blob_attr *msg)
 240 {
 241         struct blob_attr *tb[IFACE_ATTR_MAX];
 242         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 243
 244         const char *interface = (tb[IFACE_ATTR_INTERFACE]) ?
 245                         blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]) : "";
 246         const char *ifname = (tb[IFACE_ATTR_IFNAME]) ?
 247                         blobmsg_get_string(tb[IFACE_ATTR_IFNAME]) : "";
 248
 249         struct interface *c, *iface = NULL;
 250         list_for_each_entry(c, &interfaces, head)
 251                 if (!strcmp(interface, c->name) || !strcmp(ifname, c->ifname))
 252                         iface = c;
 253
 254         if (iface && iface->ignore)
 255                 return 0;
 256
 257         update_netifd(false);
 258         return 0;
 259 }
 260
 261
 262 void ubus_apply_network(void)
 263 {
 264         struct blob_attr *a;
 265         unsigned rem;
 266
 267         if (!dump)
 268                 return;
 269
 270         blobmsg_for_each_attr(a, dump, rem) {
 271                 struct blob_attr *tb[IFACE_ATTR_MAX];
 272                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(a), blobmsg_data_len(a));
 273
 274                 if (!tb[IFACE_ATTR_INTERFACE] || !tb[IFACE_ATTR_DATA])
 275                         continue;
 276
 277                 const char *interface = (tb[IFACE_ATTR_INTERFACE]) ?
 278                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]) : "";
 279                 const char *ifname = (tb[IFACE_ATTR_IFNAME]) ?
 280                                 blobmsg_get_string(tb[IFACE_ATTR_IFNAME]) : "";
 281
 282                 bool matched = false;
 283                 struct interface *c, *n;
 284                 list_for_each_entry_safe(c, n, &interfaces, head) {
 285                         char *f = memmem(c->upstream, c->upstream_len,
 286                                         interface, strlen(interface) + 1);
 287                         bool cmatched = !strcmp(interface, c->name) || !strcmp(ifname, c->ifname);
 288                         matched |= cmatched;
 289
 290                         if (!cmatched && (!c->upstream_len || !f || (f != c->upstream && f[-1] != 0)))
 291                                 continue;
 292
 293                         if (!c->ignore)
 294                                 config_parse_interface(blobmsg_data(tb[IFACE_ATTR_DATA]),
 295                                                 blobmsg_data_len(tb[IFACE_ATTR_DATA]), c->name, false);
 296                 }
 297
 298                 if (!matched)
 299                         config_parse_interface(blobmsg_data(tb[IFACE_ATTR_DATA]),
 300                                         blobmsg_data_len(tb[IFACE_ATTR_DATA]), interface, false);
 301         }
 302 }
 303
 304
 305 enum {
 306         OBJ_ATTR_ID,
 307         OBJ_ATTR_PATH,
 308         OBJ_ATTR_MAX
 309 };
 310
 311 static const struct blobmsg_policy obj_attrs[OBJ_ATTR_MAX] = {
 312         [OBJ_ATTR_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 313         [OBJ_ATTR_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 314 };
 315
 316 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac,
 317                 const size_t mlen, const struct in_addr *addr, const char *name,
 318                 const char *interface)
 319 {
 320         if (!ubus || !main_object.has_subscribers)
 321                 return;
 322
 323         blob_buf_init(&b, 0);
 324         if (mac)
 325                 blobmsg_add_string(&b, "mac", odhcpd_print_mac(mac, mlen));
 326         if (addr)
 327                 blobmsg_add_string(&b, "ip", inet_ntoa(*addr));
 328         if (name)
 329                 blobmsg_add_string(&b, "name", name);
 330         if (interface)
 331                 blobmsg_add_string(&b, "interface", interface);
 332
 333         ubus_notify(ubus, &main_object, type, b.head, -1);
 334 }
 335
 336 static void handle_event(_unused struct ubus_context *ctx, _unused struct ubus_event_handler *ev,
 337                 _unused const char *type, struct blob_attr *msg)
 338 {
 339         struct blob_attr *tb[OBJ_ATTR_MAX];
 340         blobmsg_parse(obj_attrs, OBJ_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 341
 342         if (!tb[OBJ_ATTR_ID] || !tb[OBJ_ATTR_PATH])
 343                 return;
 344
 345         if (strcmp(blobmsg_get_string(tb[OBJ_ATTR_PATH]), "network.interface"))
 346                 return;
 347
 348         objid = blobmsg_get_u32(tb[OBJ_ATTR_ID]);
 349         update_netifd(true);
 350 }
 351
 352 static struct ubus_event_handler event_handler = { .cb = handle_event };
 353
 354
 355 const char* ubus_get_ifname(const char *name)
 356 {
 357         struct blob_attr *c;
 358         unsigned rem;
 359
 360         if (!dump)
 361                 return NULL;
 362
 363         blobmsg_for_each_attr(c, dump, rem) {
 364                 struct blob_attr *tb[IFACE_ATTR_MAX];
 365                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 366
 367                 if (!tb[IFACE_ATTR_INTERFACE] || strcmp(name,
 368                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])))
 369                         continue;
 370
 371                 if (tb[IFACE_ATTR_IFNAME])
 372                         return blobmsg_get_string(tb[IFACE_ATTR_IFNAME]);
 373         }
 374
 375         return NULL;
 376 }
 377
 378
 379 bool ubus_has_prefix(const char *name, const char *ifname)
 380 {
 381         struct blob_attr *c, *cur;
 382         unsigned rem;
 383
 384         if (!dump)
 385                 return NULL;
 386
 387         blobmsg_for_each_attr(c, dump, rem) {
 388                 struct blob_attr *tb[IFACE_ATTR_MAX];
 389                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 390
 391                 if (!tb[IFACE_ATTR_INTERFACE] || !tb[IFACE_ATTR_IFNAME])
 392                         continue;
 393
 394                 if (strcmp(name, blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])) ||
 395                                 strcmp(ifname, blobmsg_get_string(tb[IFACE_ATTR_IFNAME])))
 396                         continue;
 397
 398                 if ((cur = tb[IFACE_ATTR_PREFIX])) {
 399                         if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY || !blobmsg_check_attr(cur, false))
 400                                 continue;
 401
 402                         struct blob_attr *d;
 403                         unsigned drem;
 404                         blobmsg_for_each_attr(d, cur, drem) {
 405                                 return true;
 406                         }
 407                 }
 408         }
 409
 410         return false;
 411 }
 412
 413
 414 int ubus_init(void)
 415 {
 416         if (!(ubus = ubus_connect(NULL))) {
 417                 syslog(LOG_ERR, "Unable to connect to ubus: %m");
 418                 return -1;
 419         }
 420
 421         netifd.cb = handle_update;
 422         ubus_register_subscriber(ubus, &netifd);
 423
 424         ubus_add_uloop(ubus);
 425         ubus_add_object(ubus, &main_object);
 426         ubus_register_event_handler(ubus, &event_handler, "ubus.object.add");
 427         if (!ubus_lookup_id(ubus, "network.interface", &objid))
 428                 update_netifd(true);
 429
 430         return 0;
 431 }
 432