src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <string.h>
   8 #include <sys/stat.h>
   9
  10 #include <uci.h>
  11 #include <uci_blob.h>
  12
  13 #include "odhcpd.h"
  14
  15 static struct blob_buf b;
  16 static int reload_pipe[2];
  17 struct list_head leases = LIST_HEAD_INIT(leases);
  18 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  19 struct config config = {false, NULL, NULL};
  20
  21 enum {
  22         IFACE_ATTR_INTERFACE,
  23         IFACE_ATTR_IFNAME,
  24         IFACE_ATTR_NETWORKID,
  25         IFACE_ATTR_DYNAMICDHCP,
  26         IFACE_ATTR_IGNORE,
  27         IFACE_ATTR_LEASETIME,
  28         IFACE_ATTR_LIMIT,
  29         IFACE_ATTR_START,
  30         IFACE_ATTR_MASTER,
  31         IFACE_ATTR_UPSTREAM,
  32         IFACE_ATTR_RA,
  33         IFACE_ATTR_DHCPV4,
  34         IFACE_ATTR_DHCPV6,
  35         IFACE_ATTR_NDP,
  36         IFACE_ATTR_ROUTER,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DOMAIN,
  39         IFACE_ATTR_FILTER_CLASS,
  40         IFACE_ATTR_DHCPV6_RAW,
  41         IFACE_ATTR_RA_DEFAULT,
  42         IFACE_ATTR_RA_MANAGEMENT,
  43         IFACE_ATTR_RA_OFFLINK,
  44         IFACE_ATTR_RA_PREFERENCE,
  45         IFACE_ATTR_RA_ADVROUTER,
  46         IFACE_ATTR_RA_MAXINTERVAL,
  47         IFACE_ATTR_PD_MANAGER,
  48         IFACE_ATTR_PD_CER,
  49         IFACE_ATTR_NDPROXY_ROUTING,
  50         IFACE_ATTR_NDPROXY_SLAVE,
  51         IFACE_ATTR_MAX
  52 };
  53
  54 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  55         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  57         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  60         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  62         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  63         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  70         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  71         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  72         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  77         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  78         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  79         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  81         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  82         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  83         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  84 };
  85
  86 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  87         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  90 };
  91
  92 const struct uci_blob_param_list interface_attr_list = {
  93         .n_params = IFACE_ATTR_MAX,
  94         .params = iface_attrs,
  95         .info = iface_attr_info,
  96 };
  97
  98 enum {
  99         LEASE_ATTR_IP,
 100         LEASE_ATTR_MAC,
 101         LEASE_ATTR_DUID,
 102         LEASE_ATTR_HOSTID,
 103         LEASE_ATTR_LEASETIME,
 104         LEASE_ATTR_NAME,
 105         LEASE_ATTR_MAX
 106 };
 107
 108 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 109         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 110         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 111         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 112         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 113         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 114         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 115 };
 116
 117 const struct uci_blob_param_list lease_attr_list = {
 118         .n_params = LEASE_ATTR_MAX,
 119         .params = lease_attrs,
 120 };
 121
 122 enum {
 123         ODHCPD_ATTR_MAINDHCP,
 124         ODHCPD_ATTR_LEASEFILE,
 125         ODHCPD_ATTR_LEASETRIGGER,
 126         ODHCPD_ATTR_MAX
 127 };
 128
 129 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 130         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 131         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 132         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 133 };
 134
 135 const struct uci_blob_param_list odhcpd_attr_list = {
 136         .n_params = ODHCPD_ATTR_MAX,
 137         .params = odhcpd_attrs,
 138 };
 139
 140 static int mkdir_p(char *dir, mode_t mask)
 141 {
 142         char *l = strrchr(dir, '/');
 143         int ret;
 144
 145         if (!l)
 146                 return 0;
 147
 148         *l = '\0';
 149
 150         if (mkdir_p(dir, mask))
 151                 return -1;
 152
 153         *l = '/';
 154
 155         ret = mkdir(dir, mask);
 156         if (ret && errno == EEXIST)
 157                 return 0;
 158
 159         if (ret)
 160                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 161
 162         return ret;
 163 }
 164
 165 static void free_lease(struct lease *l)
 166 {
 167         if (l->head.next)
 168                 list_del(&l->head);
 169
 170         free(l->duid);
 171         free(l);
 172 }
 173
 174 static struct interface* get_interface(const char *name)
 175 {
 176         struct interface *c;
 177         list_for_each_entry(c, &interfaces, head)
 178                 if (!strcmp(c->name, name))
 179                         return c;
 180         return NULL;
 181 }
 182
 183 static void clean_interface(struct interface *iface)
 184 {
 185         free(iface->dns);
 186         free(iface->search);
 187         free(iface->upstream);
 188         free(iface->dhcpv4_router);
 189         free(iface->dhcpv4_dns);
 190         free(iface->dhcpv6_raw);
 191         free(iface->filter_class);
 192         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 193 }
 194
 195 static void close_interface(struct interface *iface)
 196 {
 197         if (iface->head.next)
 198                 list_del(&iface->head);
 199
 200         setup_router_interface(iface, false);
 201         setup_dhcpv6_interface(iface, false);
 202         setup_ndp_interface(iface, false);
 203         setup_dhcpv4_interface(iface, false);
 204
 205         clean_interface(iface);
 206         free(iface);
 207 }
 208
 209 static int parse_mode(const char *mode)
 210 {
 211         if (!strcmp(mode, "disabled"))
 212                 return RELAYD_DISABLED;
 213         else if (!strcmp(mode, "server"))
 214                 return RELAYD_SERVER;
 215         else if (!strcmp(mode, "relay"))
 216                 return RELAYD_RELAY;
 217         else if (!strcmp(mode, "hybrid"))
 218                 return RELAYD_HYBRID;
 219         else
 220                 return -1;
 221 }
 222
 223 static void set_config(struct uci_section *s)
 224 {
 225         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 226
 227         blob_buf_init(&b, 0);
 228         uci_to_blob(&b, s, &odhcpd_attr_list);
 229         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 230
 231         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 232                 config.legacy = blobmsg_get_bool(c);
 233
 234         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 235                 free(config.dhcp_statefile);
 236                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 237         }
 238
 239         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 240                 free(config.dhcp_cb);
 241                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 242         }
 243 }
 244
 245 static double parse_leasetime(struct blob_attr *c) {
 246         char *val = blobmsg_get_string(c), *endptr = NULL;
 247         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 248
 249         if (time && endptr && endptr[0]) {
 250                 if (endptr[0] == 's')
 251                         time *= 1;
 252                 else if (endptr[0] == 'm')
 253                         time *= 60;
 254                 else if (endptr[0] == 'h')
 255                         time *= 3600;
 256                 else if (endptr[0] == 'd')
 257                         time *= 24 * 3600;
 258                 else if (endptr[0] == 'w')
 259                         time *= 7 * 24 * 3600;
 260                 else
 261                         goto err;
 262         }
 263
 264         if (time >= 60)
 265                 return time;
 266
 267         return 0;
 268
 269 err:
 270         return -1;
 271 }
 272
 273 static int set_lease(struct uci_section *s)
 274 {
 275         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 276
 277         blob_buf_init(&b, 0);
 278         uci_to_blob(&b, s, &lease_attr_list);
 279         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 280
 281         size_t hostlen = 1;
 282         if ((c = tb[LEASE_ATTR_NAME]))
 283                 hostlen = blobmsg_data_len(c);
 284
 285         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 286         if (!lease)
 287                 goto err;
 288
 289         if (hostlen > 1)
 290                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 291
 292         if ((c = tb[LEASE_ATTR_IP]))
 293                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 294                         goto err;
 295
 296         if ((c = tb[LEASE_ATTR_MAC]))
 297                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 298                         goto err;
 299
 300         if ((c = tb[LEASE_ATTR_DUID])) {
 301                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 302                 lease->duid = malloc(duidlen);
 303                 if (!lease->duid)
 304                         goto err;
 305
 306                 ssize_t len = odhcpd_unhexlify(lease->duid,
 307                                 duidlen, blobmsg_get_string(c));
 308
 309                 if (len < 0)
 310                         goto err;
 311
 312                 lease->duid_len = len;
 313         }
 314
 315         if ((c = tb[LEASE_ATTR_HOSTID])) {
 316                 errno = 0;
 317                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 318                 if (errno)
 319                         goto err;
 320         }
 321
 322         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 323                 double time = parse_leasetime(c);
 324                 if (time < 0)
 325                         goto err;
 326
 327                 if (time >= 60)
 328                         lease->dhcpv4_leasetime = time;
 329         }
 330
 331         list_add(&lease->head, &leases);
 332         return 0;
 333
 334 err:
 335         if (lease)
 336                 free_lease(lease);
 337
 338         return -1;
 339 }
 340
 341 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 342 {
 343         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 344         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 345
 346         if (tb[IFACE_ATTR_INTERFACE])
 347                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 348
 349         if (!name)
 350                 return -1;
 351
 352         struct interface *iface = get_interface(name);
 353         if (!iface) {
 354                 iface = calloc(1, sizeof(*iface));
 355                 if (!iface)
 356                         return -1;
 357
 358                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 359
 360                 /* Default settings */
 361                 iface->managed = 1;
 362                 iface->learn_routes = true;
 363
 364                 list_add(&iface->head, &interfaces);
 365                 overwrite = true;
 366         }
 367
 368         const char *ifname = NULL;
 369         if (overwrite) {
 370                 if ((c = tb[IFACE_ATTR_IFNAME]))
 371                         ifname = blobmsg_get_string(c);
 372                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 373                         ifname = blobmsg_get_string(c);
 374         }
 375
 376 #ifdef WITH_UBUS
 377         if (overwrite || !iface->ifname[0])
 378                 ifname = ubus_get_ifname(name);
 379 #endif
 380
 381         if (!iface->ifname[0] && !ifname)
 382                 goto err;
 383
 384         if (ifname)
 385                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 386
 387         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 388                 goto err;
 389
 390         iface->inuse = true;
 391
 392         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 393                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 394
 395         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 396                 iface->ignore = blobmsg_get_bool(c);
 397
 398         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 399                 double time = parse_leasetime(c);
 400                 if (time < 0)
 401                         goto err;
 402
 403                 if (time >= 60)
 404                         iface->dhcpv4_leasetime = time;
 405         }
 406
 407         if ((c = tb[IFACE_ATTR_START])) {
 408                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 409
 410                 if (config.legacy)
 411                         iface->dhcpv4 = RELAYD_SERVER;
 412         }
 413
 414         if ((c = tb[IFACE_ATTR_LIMIT]))
 415                 iface->dhcpv4_end.s_addr = htonl(
 416                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 417
 418         if ((c = tb[IFACE_ATTR_MASTER]))
 419                 iface->master = blobmsg_get_bool(c);
 420
 421         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 422                 struct blob_attr *cur;
 423                 unsigned rem;
 424
 425                 blobmsg_for_each_attr(cur, c, rem) {
 426                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 427                                 continue;
 428
 429                         iface->upstream = realloc(iface->upstream,
 430                                         iface->upstream_len + blobmsg_data_len(cur));
 431                         if (!iface->upstream)
 432                                 goto err;
 433
 434                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 435                         iface->upstream_len += blobmsg_data_len(cur);
 436                 }
 437         }
 438
 439         int mode;
 440         if ((c = tb[IFACE_ATTR_RA])) {
 441                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 442                         iface->ra = mode;
 443                 else
 444                         goto err;
 445         }
 446
 447         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 448                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 449                         iface->dhcpv4 = mode;
 450                 else
 451                         goto err;
 452         }
 453
 454         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 455                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 456                         iface->dhcpv6 = mode;
 457                 else
 458                         goto err;
 459         }
 460
 461         if ((c = tb[IFACE_ATTR_NDP])) {
 462                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 463                         iface->ndp = mode;
 464                 else
 465                         goto err;
 466         }
 467
 468         if ((c = tb[IFACE_ATTR_ROUTER])) {
 469                 struct blob_attr *cur;
 470                 unsigned rem;
 471
 472                 blobmsg_for_each_attr(cur, c, rem) {
 473                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 474                                 continue;
 475
 476                         struct in_addr addr4;
 477                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 478                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 479                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 480                                 if (!iface->dhcpv4_router)
 481                                         goto err;
 482
 483                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 484                         } else
 485                                 goto err;
 486                 }
 487         }
 488
 489         if ((c = tb[IFACE_ATTR_DNS])) {
 490                 struct blob_attr *cur;
 491                 unsigned rem;
 492
 493                 iface->always_rewrite_dns = true;
 494                 blobmsg_for_each_attr(cur, c, rem) {
 495                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 496                                 continue;
 497
 498                         struct in_addr addr4;
 499                         struct in6_addr addr6;
 500                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 501                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 502                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 503                                 if (!iface->dhcpv4_dns)
 504                                         goto err;
 505
 506                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 507                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 508                                 iface->dns = realloc(iface->dns,
 509                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 510                                 if (!iface->dns)
 511                                         goto err;
 512
 513                                 iface->dns[iface->dns_cnt - 1] = addr6;
 514                         } else
 515                                 goto err;
 516                 }
 517         }
 518
 519         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 520                 struct blob_attr *cur;
 521                 unsigned rem;
 522
 523                 blobmsg_for_each_attr(cur, c, rem) {
 524                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 525                                 continue;
 526
 527                         uint8_t buf[256];
 528                         char *domain = blobmsg_get_string(cur);
 529                         size_t domainlen = strlen(domain);
 530                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 531                                 domain[domainlen - 1] = 0;
 532
 533                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 534                         if (len <= 0)
 535                                 goto err;
 536
 537                         iface->search = realloc(iface->search, iface->search_len + len);
 538                         if (!iface->search)
 539                                 goto err;
 540
 541                         memcpy(&iface->search[iface->search_len], buf, len);
 542                         iface->search_len += len;
 543                 }
 544         }
 545
 546         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 547                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 548                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 549         }
 550
 551         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 552                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 553                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 554                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 555         }
 556
 557         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 558                 iface->default_router = blobmsg_get_u32(c);
 559
 560         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 561                 iface->managed = blobmsg_get_u32(c);
 562
 563         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 564                 iface->ra_not_onlink = blobmsg_get_bool(c);
 565
 566         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 567                 iface->ra_advrouter = blobmsg_get_bool(c);
 568
 569         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 570                 iface->ra_maxinterval = blobmsg_get_u32(c);
 571
 572         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 573                 const char *prio = blobmsg_get_string(c);
 574
 575                 if (!strcmp(prio, "high"))
 576                         iface->route_preference = 1;
 577                 else if (!strcmp(prio, "low"))
 578                         iface->route_preference = -1;
 579                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 580                         iface->route_preference = 0;
 581                 else
 582                         goto err;
 583         }
 584
 585         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 586                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 587                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 588
 589         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 590                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 591                 goto err;
 592
 593         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 594                 iface->learn_routes = blobmsg_get_bool(c);
 595
 596         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 597                 iface->external = blobmsg_get_bool(c);
 598
 599         return 0;
 600
 601 err:
 602         close_interface(iface);
 603         return -1;
 604 }
 605
 606 static int set_interface(struct uci_section *s)
 607 {
 608         blob_buf_init(&b, 0);
 609         uci_to_blob(&b, s, &interface_attr_list);
 610
 611         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 612 }
 613
 614 void odhcpd_reload(void)
 615 {
 616         struct uci_context *uci = uci_alloc_context();
 617
 618         while (!list_empty(&leases))
 619                 free_lease(list_first_entry(&leases, struct lease, head));
 620
 621         struct interface *master = NULL, *i, *n;
 622
 623         if (!uci)
 624                 return;
 625
 626         list_for_each_entry(i, &interfaces, head)
 627                 clean_interface(i);
 628
 629         struct uci_package *dhcp = NULL;
 630         if (!uci_load(uci, "dhcp", &dhcp)) {
 631                 struct uci_element *e;
 632                 uci_foreach_element(&dhcp->sections, e) {
 633                         struct uci_section *s = uci_to_section(e);
 634                         if (!strcmp(s->type, "host"))
 635                                 set_lease(s);
 636                         else if (!strcmp(s->type, "odhcpd"))
 637                                 set_config(s);
 638                 }
 639
 640                 uci_foreach_element(&dhcp->sections, e) {
 641                         struct uci_section *s = uci_to_section(e);
 642                         if (!strcmp(s->type, "dhcp"))
 643                                 set_interface(s);
 644                 }
 645         }
 646
 647         if (config.dhcp_statefile) {
 648                 char *path = strdup(config.dhcp_statefile);
 649
 650                 mkdir_p(dirname(path), 0755);
 651                 free(path);
 652         }
 653
 654 #ifdef WITH_UBUS
 655         ubus_apply_network();
 656 #endif
 657
 658         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 659
 660         /* Test for */
 661         list_for_each_entry(i, &interfaces, head) {
 662                 if (i->master)
 663                         continue;
 664
 665                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 666                         any_dhcpv6_slave = true;
 667
 668                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 669                         any_ra_slave = true;
 670
 671                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 672                         any_ndp_slave = true;
 673         }
 674
 675         /* Evaluate hybrid mode for master */
 676         list_for_each_entry(i, &interfaces, head) {
 677                 if (!i->master)
 678                         continue;
 679
 680                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 681 #ifdef WITH_UBUS
 682                 if (!ubus_has_prefix(i->name, i->ifname))
 683                         hybrid_mode = RELAYD_RELAY;
 684 #endif
 685
 686                 if (i->dhcpv6 == RELAYD_HYBRID)
 687                         i->dhcpv6 = hybrid_mode;
 688
 689                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 690                         i->dhcpv6 = RELAYD_DISABLED;
 691
 692                 if (i->ra == RELAYD_HYBRID)
 693                         i->ra = hybrid_mode;
 694
 695                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 696                         i->ra = RELAYD_DISABLED;
 697
 698                 if (i->ndp == RELAYD_HYBRID)
 699                         i->ndp = hybrid_mode;
 700
 701                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 702                         i->ndp = RELAYD_DISABLED;
 703
 704                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 705                         master = i;
 706         }
 707
 708
 709         list_for_each_entry_safe(i, n, &interfaces, head) {
 710                 if (i->inuse) {
 711                         /* Resolve hybrid mode */
 712                         if (i->dhcpv6 == RELAYD_HYBRID)
 713                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 714                                                 RELAYD_RELAY : RELAYD_SERVER;
 715
 716                         if (i->ra == RELAYD_HYBRID)
 717                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 718                                                 RELAYD_RELAY : RELAYD_SERVER;
 719
 720                         if (i->ndp == RELAYD_HYBRID)
 721                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 722                                                 RELAYD_RELAY : RELAYD_DISABLED;
 723
 724                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 725                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 726                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 727                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 728                 } else {
 729                         close_interface(i);
 730                 }
 731         }
 732
 733         uci_unload(uci, dhcp);
 734         uci_free_context(uci);
 735 }
 736
 737 static void handle_signal(int signal)
 738 {
 739         char b[1] = {0};
 740
 741         if (signal == SIGHUP) {
 742                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 743         } else
 744                 uloop_end();
 745 }
 746
 747 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 748 {
 749         char b[512];
 750         if (read(u->fd, b, sizeof(b)) < 0) {}
 751
 752         odhcpd_reload();
 753 }
 754
 755 static struct uloop_fd reload_fd = { .cb = reload_cb };
 756
 757 void odhcpd_run(void)
 758 {
 759         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 760
 761         reload_fd.fd = reload_pipe[0];
 762         uloop_fd_add(&reload_fd, ULOOP_READ);
 763
 764         signal(SIGTERM, handle_signal);
 765         signal(SIGINT, handle_signal);
 766         signal(SIGHUP, handle_signal);
 767
 768 #ifdef WITH_UBUS
 769         while (init_ubus())
 770                 sleep(1);
 771 #endif
 772
 773         odhcpd_reload();
 774         uloop_run();
 775
 776         while (!list_empty(&interfaces))
 777                 close_interface(list_first_entry(&interfaces, struct interface, head));
 778 }
 779