src/ubus.c

   1 #include <syslog.h>
   2 #include <libubus.h>
   3 #include <libubox/uloop.h>
   4 #include <arpa/inet.h>
   5
   6 #include "odhcpd.h"
   7 #include "dhcpv6.h"
   8 #include "dhcpv4.h"
   9
  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
  19 static int handle_dhcpv4_leases(struct ubus_context *ctx, _unused struct ubus_object *obj,
  20                 struct ubus_request_data *req, _unused const char *method,
  21                 _unused struct blob_attr *msg)
  22 {
  23         blob_buf_init(&b, 0);
  24         void *a = blobmsg_open_table(&b, "device");
  25         time_t now = odhcpd_time();
  26
  27         struct interface *iface;
  28         list_for_each_entry(iface, &interfaces, head) {
  29                 if (iface->dhcpv4 != RELAYD_SERVER)
  30                         continue;
  31
  32                 void *i = blobmsg_open_table(&b, iface->ifname);
  33                 void *j = blobmsg_open_array(&b, "leases");
  34
  35                 struct dhcpv4_assignment *lease;
  36                 list_for_each_entry(lease, &iface->dhcpv4_assignments, head) {
  37                         if (lease->valid_until < now)
  38                                 continue;
  39
  40                         void *l = blobmsg_open_table(&b, NULL);
  41
  42                         char *buf = blobmsg_alloc_string_buffer(&b, "mac", 13);
  43                         odhcpd_hexlify(buf, lease->hwaddr, sizeof(lease->hwaddr));
  44                         blobmsg_add_string_buffer(&b);
  45
  46                         blobmsg_add_string(&b, "hostname", lease->hostname);
  47
  48                         buf = blobmsg_alloc_string_buffer(&b, "ip", INET_ADDRSTRLEN);
  49                         struct in_addr addr = {htonl(lease->addr)};
  50                         inet_ntop(AF_INET, &addr, buf, INET_ADDRSTRLEN);
  51                         blobmsg_add_string_buffer(&b);
  52
  53                         blobmsg_add_u32(&b, "valid", now - lease->valid_until);
  54
  55                         blobmsg_close_table(&b, l);
  56                 }
  57
  58                 blobmsg_close_array(&b, j);
  59                 blobmsg_close_table(&b, i);
  60         }
  61
  62         blobmsg_close_table(&b, a);
  63         ubus_send_reply(ctx, req, b.head);
  64         return 0;
  65 }
  66
  67
  68 static int handle_dhcpv6_leases(_unused struct ubus_context *ctx, _unused struct ubus_object *obj,
  69                 _unused struct ubus_request_data *req, _unused const char *method,
  70                 _unused struct blob_attr *msg)
  71 {
  72         blob_buf_init(&b, 0);
  73         void *a = blobmsg_open_table(&b, "device");
  74         time_t now = odhcpd_time();
  75
  76         struct interface *iface;
  77         list_for_each_entry(iface, &interfaces, head) {
  78                 if (iface->dhcpv6 != RELAYD_SERVER)
  79                         continue;
  80
  81                 void *i = blobmsg_open_table(&b, iface->ifname);
  82                 void *j = blobmsg_open_array(&b, "leases");
  83
  84                 struct dhcpv6_assignment *lease;
  85                 list_for_each_entry(lease, &iface->ia_assignments, head) {
  86                         if (lease->valid_until < now)
  87                                 continue;
  88
  89                         void *l = blobmsg_open_table(&b, NULL);
  90
  91                         char *buf = blobmsg_alloc_string_buffer(&b, "duid", 264);
  92                         odhcpd_hexlify(buf, lease->clid_data, lease->clid_len);
  93                         blobmsg_add_string_buffer(&b);
  94
  95                         blobmsg_add_u32(&b, "iaid", ntohl(lease->iaid));
  96                         blobmsg_add_string(&b, "hostname", (lease->hostname) ? lease->hostname : "");
  97                         blobmsg_add_u32(&b, "assigned", lease->assigned);
  98                         blobmsg_add_u32(&b, "length", lease->length);
  99
 100                         void *m = blobmsg_open_array(&b, "ipv6");
 101                         struct in6_addr addr;
 102                         for (size_t i = 0; i < iface->ia_addr_len; ++i) {
 103                                 if (iface->ia_addr[i].prefix > 64)
 104                                         continue;
 105
 106                                 addr = iface->ia_addr[i].addr;
 107                                 if (lease->length == 128)
 108                                         addr.s6_addr32[3] = htonl(lease->assigned);
 109                                 else
 110                                         addr.s6_addr32[1] |= htonl(lease->assigned);
 111
 112                                 char *c = blobmsg_alloc_string_buffer(&b, NULL, INET6_ADDRSTRLEN);
 113                                 inet_ntop(AF_INET6, &addr, c, INET6_ADDRSTRLEN);
 114                                 blobmsg_add_string_buffer(&b);
 115                         }
 116                         blobmsg_close_table(&b, m);
 117
 118                         blobmsg_add_u32(&b, "valid", now - lease->valid_until);
 119
 120                         blobmsg_close_table(&b, l);
 121                 }
 122
 123                 blobmsg_close_array(&b, j);
 124                 blobmsg_close_table(&b, i);
 125         }
 126
 127         blobmsg_close_table(&b, a);
 128         ubus_send_reply(ctx, req, b.head);
 129         return 0;
 130 }
 131
 132
 133 static struct ubus_method main_object_methods[] = {
 134         {.name = "ipv4leases", .handler = handle_dhcpv4_leases},
 135         {.name = "ipv6leases", .handler = handle_dhcpv6_leases},
 136 };
 137
 138 static struct ubus_object_type main_object_type =
 139                 UBUS_OBJECT_TYPE("dhcp", main_object_methods);
 140
 141 static struct ubus_object main_object = {
 142         .name = "dhcp",
 143         .type = &main_object_type,
 144         .methods = main_object_methods,
 145         .n_methods = ARRAY_SIZE(main_object_methods),
 146 };
 147
 148
 149 enum {
 150         DUMP_ATTR_INTERFACE,
 151         DUMP_ATTR_MAX
 152 };
 153
 154 static const struct blobmsg_policy dump_attrs[DUMP_ATTR_MAX] = {
 155         [DUMP_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_ARRAY },
 156 };
 157
 158
 159 enum {
 160         IFACE_ATTR_INTERFACE,
 161         IFACE_ATTR_IFNAME,
 162         IFACE_ATTR_UP,
 163         IFACE_ATTR_DATA,
 164         IFACE_ATTR_PREFIX,
 165         IFACE_ATTR_ADDRESS,
 166         IFACE_ATTR_ADDRESS4,
 167         IFACE_ATTR_MAX,
 168 };
 169
 170 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
 171         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
 172         [IFACE_ATTR_IFNAME] = { .name = "l3_device", .type = BLOBMSG_TYPE_STRING },
 173         [IFACE_ATTR_UP] = { .name = "up", .type = BLOBMSG_TYPE_BOOL },
 174         [IFACE_ATTR_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 175         [IFACE_ATTR_PREFIX] = { .name = "ipv6-prefix", .type = BLOBMSG_TYPE_ARRAY },
 176         [IFACE_ATTR_ADDRESS] = { .name = "ipv6-address", .type = BLOBMSG_TYPE_ARRAY },
 177         [IFACE_ATTR_ADDRESS4] = { .name = "ipv4-address", .type = BLOBMSG_TYPE_ARRAY },
 178 };
 179
 180 static void handle_dump(_unused struct ubus_request *req, _unused int type, struct blob_attr *msg)
 181 {
 182         struct blob_attr *tb[DUMP_ATTR_MAX];
 183         blobmsg_parse(dump_attrs, DUMP_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 184
 185         if (!tb[DUMP_ATTR_INTERFACE])
 186                 return;
 187
 188         free(dump);
 189         dump = blob_memdup(tb[DUMP_ATTR_INTERFACE]);
 190         odhcpd_reload();
 191 }
 192
 193
 194 static void update_netifd(bool subscribe)
 195 {
 196         if (subscribe)
 197                 ubus_subscribe(ubus, &netifd, objid);
 198
 199         ubus_abort_request(ubus, &req_dump);
 200         if (!ubus_invoke_async(ubus, objid, "dump", NULL, &req_dump)) {
 201                 req_dump.data_cb = handle_dump;
 202                 ubus_complete_request_async(ubus, &req_dump);
 203         }
 204 }
 205
 206
 207 static int handle_update(_unused struct ubus_context *ctx, _unused struct ubus_object *obj,
 208                 _unused struct ubus_request_data *req, _unused const char *method,
 209                 struct blob_attr *msg)
 210 {
 211         struct blob_attr *tb[IFACE_ATTR_MAX];
 212         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 213
 214         const char *interface = (tb[IFACE_ATTR_INTERFACE]) ?
 215                         blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]) : "";
 216         const char *ifname = (tb[IFACE_ATTR_IFNAME]) ?
 217                         blobmsg_get_string(tb[IFACE_ATTR_IFNAME]) : "";
 218
 219         struct interface *c, *iface = NULL;
 220         list_for_each_entry(c, &interfaces, head)
 221                 if (!strcmp(interface, c->name) || !strcmp(ifname, c->ifname))
 222                         iface = c;
 223
 224         if (iface && iface->ignore)
 225                 return 0;
 226
 227         update_netifd(false);
 228         return 0;
 229 }
 230
 231
 232 void ubus_apply_network(void)
 233 {
 234         struct blob_attr *a;
 235         unsigned rem;
 236
 237         if (!dump)
 238                 return;
 239
 240         blobmsg_for_each_attr(a, dump, rem) {
 241                 struct blob_attr *tb[IFACE_ATTR_MAX];
 242                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(a), blobmsg_data_len(a));
 243
 244                 if (!tb[IFACE_ATTR_INTERFACE] || !tb[IFACE_ATTR_DATA])
 245                         continue;
 246
 247                 const char *interface = (tb[IFACE_ATTR_INTERFACE]) ?
 248                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]) : "";
 249                 const char *ifname = (tb[IFACE_ATTR_IFNAME]) ?
 250                                 blobmsg_get_string(tb[IFACE_ATTR_IFNAME]) : "";
 251
 252                 bool matched = false;
 253                 struct interface *c, *n;
 254                 list_for_each_entry_safe(c, n, &interfaces, head) {
 255                         char *f = memmem(c->upstream, c->upstream_len,
 256                                         interface, strlen(interface) + 1);
 257                         bool cmatched = !strcmp(interface, c->name) || !strcmp(ifname, c->ifname);
 258                         matched |= cmatched;
 259
 260                         if (!cmatched && (!c->upstream_len || !f || (f != c->upstream && f[-1] != 0)))
 261                                 continue;
 262
 263                         if (!c->ignore)
 264                                 config_parse_interface(blobmsg_data(tb[IFACE_ATTR_DATA]),
 265                                                 blobmsg_data_len(tb[IFACE_ATTR_DATA]), c->name, false);
 266                 }
 267
 268                 if (!matched)
 269                         config_parse_interface(blobmsg_data(tb[IFACE_ATTR_DATA]),
 270                                         blobmsg_data_len(tb[IFACE_ATTR_DATA]), interface, false);
 271         }
 272 }
 273
 274
 275 enum {
 276         OBJ_ATTR_ID,
 277         OBJ_ATTR_PATH,
 278         OBJ_ATTR_MAX
 279 };
 280
 281 static const struct blobmsg_policy obj_attrs[OBJ_ATTR_MAX] = {
 282         [OBJ_ATTR_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 283         [OBJ_ATTR_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 284 };
 285
 286
 287 static void handle_event(_unused struct ubus_context *ctx, _unused struct ubus_event_handler *ev,
 288                 _unused const char *type, struct blob_attr *msg)
 289 {
 290         struct blob_attr *tb[OBJ_ATTR_MAX];
 291         blobmsg_parse(obj_attrs, OBJ_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 292
 293         if (!tb[OBJ_ATTR_ID] || !tb[OBJ_ATTR_PATH])
 294                 return;
 295
 296         if (strcmp(blobmsg_get_string(tb[OBJ_ATTR_PATH]), "network.interface"))
 297                 return;
 298
 299         objid = blobmsg_get_u32(tb[OBJ_ATTR_ID]);
 300         update_netifd(true);
 301 }
 302
 303 static struct ubus_event_handler event_handler = { .cb = handle_event };
 304
 305
 306 const char* ubus_get_ifname(const char *name)
 307 {
 308         struct blob_attr *c;
 309         unsigned rem;
 310
 311         if (!dump)
 312                 return NULL;
 313
 314         blobmsg_for_each_attr(c, dump, rem) {
 315                 struct blob_attr *tb[IFACE_ATTR_MAX];
 316                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 317
 318                 if (!tb[IFACE_ATTR_INTERFACE] || strcmp(name,
 319                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])))
 320                         continue;
 321
 322                 if (tb[IFACE_ATTR_IFNAME])
 323                         return blobmsg_get_string(tb[IFACE_ATTR_IFNAME]);
 324         }
 325
 326         return NULL;
 327 }
 328
 329
 330 bool ubus_has_prefix(const char *name, const char *ifname)
 331 {
 332         struct blob_attr *c, *cur;
 333         unsigned rem;
 334
 335         if (!dump)
 336                 return NULL;
 337
 338         blobmsg_for_each_attr(c, dump, rem) {
 339                 struct blob_attr *tb[IFACE_ATTR_MAX];
 340                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 341
 342                 if (!tb[IFACE_ATTR_INTERFACE] || !tb[IFACE_ATTR_IFNAME])
 343                         continue;
 344
 345                 if (strcmp(name, blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])) ||
 346                                 strcmp(ifname, blobmsg_get_string(tb[IFACE_ATTR_IFNAME])))
 347                         continue;
 348
 349                 if ((cur = tb[IFACE_ATTR_PREFIX])) {
 350                         if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY || !blobmsg_check_attr(cur, NULL))
 351                                 continue;
 352
 353                         struct blob_attr *d;
 354                         unsigned drem;
 355                         blobmsg_for_each_attr(d, cur, drem) {
 356                                 return true;
 357                         }
 358                 }
 359         }
 360
 361         return false;
 362 }
 363
 364 struct in_addr ubus_get_address4(const char *name)
 365 {
 366         struct blob_attr *c;
 367         unsigned rem;
 368
 369         if (!dump)
 370                 return NULL;
 371
 372         blobmsg_for_each_attr(c, dump, rem) {
 373                 struct blob_attr *tb[IFACE_ATTR_MAX];
 374                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 375
 376                 if (!tb[IFACE_ATTR_INTERFACE] || strcmp(name,
 377                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])))
 378                         continue;
 379
 380                 if (tb[IFACE_ATTR_IFNAME]) {
 381                         struct in_addr addr4;
 382                         if (inet_pton(AF_INET, blobmsg_get_string(tb[IFACE_ATTR_ADDRESS4]), &addr4) == 1)
 383                                 return addr4;
 384                 }
 385         }
 386
 387         return NULL;
 388 }
 389
 390 struct in_addr ubus_get_mask4(const char *name)
 391 {
 392         struct blob_attr *c;
 393         unsigned rem;
 394
 395         if (!dump)
 396                 return NULL;
 397
 398         blobmsg_for_each_attr(c, dump, rem) {
 399                 struct blob_attr *tb[IFACE_ATTR_MAX];
 400                 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
 401
 402                 if (!tb[IFACE_ATTR_INTERFACE] || strcmp(name,
 403                                 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE])))
 404                         continue;
 405
 406                 if (tb[IFACE_ATTR_IFNAME]) {
 407                         struct in_addr mask4;
 408                         if (inet_pton(AF_INET, blobmsg_get_string(tb[IFACE_ATTR_MASK4]), &mask4) == 1)
 409                                 return mask4;
 410                 }
 411         }
 412
 413         return NULL;
 414 }
 415
 416 int init_ubus(void)
 417 {
 418         if (!(ubus = ubus_connect(NULL))) {
 419                 syslog(LOG_ERR, "Unable to connect to ubus: %s", strerror(errno));
 420                 return -1;
 421         }
 422
 423         netifd.cb = handle_update;
 424         ubus_register_subscriber(ubus, &netifd);
 425
 426         ubus_add_uloop(ubus);
 427         ubus_add_object(ubus, &main_object);
 428         ubus_register_event_handler(ubus, &event_handler, "ubus.object.add");
 429         if (!ubus_lookup_id(ubus, "network.interface", &objid))
 430                 update_netifd(true);
 431
 432         return 0;
 433 }
 434