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