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 #include <syslog.h>
  10
  11 #include <uci.h>
  12 #include <uci_blob.h>
  13
  14 #include "odhcpd.h"
  15
  16 static struct blob_buf b;
  17 static int reload_pipe[2];
  18 struct list_head leases = LIST_HEAD_INIT(leases);
  19 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  20 struct config config = {.legacy = false, .dhcp_cb = NULL,
  21                         .dhcp_statefile = NULL, .log_level = LOG_INFO};
  22
  23 enum {
  24         IFACE_ATTR_INTERFACE,
  25         IFACE_ATTR_IFNAME,
  26         IFACE_ATTR_NETWORKID,
  27         IFACE_ATTR_DYNAMICDHCP,
  28         IFACE_ATTR_IGNORE,
  29         IFACE_ATTR_LEASETIME,
  30         IFACE_ATTR_LIMIT,
  31         IFACE_ATTR_START,
  32         IFACE_ATTR_MASTER,
  33         IFACE_ATTR_UPSTREAM,
  34         IFACE_ATTR_RA,
  35         IFACE_ATTR_DHCPV4,
  36         IFACE_ATTR_DHCPV6,
  37         IFACE_ATTR_NDP,
  38         IFACE_ATTR_ROUTER,
  39         IFACE_ATTR_DNS,
  40         IFACE_ATTR_DOMAIN,
  41         IFACE_ATTR_FILTER_CLASS,
  42         IFACE_ATTR_DHCPV6_RAW,
  43         IFACE_ATTR_RA_DEFAULT,
  44         IFACE_ATTR_RA_MANAGEMENT,
  45         IFACE_ATTR_RA_OFFLINK,
  46         IFACE_ATTR_RA_PREFERENCE,
  47         IFACE_ATTR_RA_ADVROUTER,
  48         IFACE_ATTR_RA_MAXINTERVAL,
  49         IFACE_ATTR_PD_MANAGER,
  50         IFACE_ATTR_PD_CER,
  51         IFACE_ATTR_NDPROXY_ROUTING,
  52         IFACE_ATTR_NDPROXY_SLAVE,
  53         IFACE_ATTR_MAX
  54 };
  55
  56 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  57         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  61         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  62         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  64         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  65         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  67         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  72         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  73         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  74         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  79         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  80         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  81         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  83         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  84         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  85         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  86 };
  87
  88 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  89         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  91         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  92 };
  93
  94 const struct uci_blob_param_list interface_attr_list = {
  95         .n_params = IFACE_ATTR_MAX,
  96         .params = iface_attrs,
  97         .info = iface_attr_info,
  98 };
  99
 100 enum {
 101         LEASE_ATTR_IP,
 102         LEASE_ATTR_MAC,
 103         LEASE_ATTR_DUID,
 104         LEASE_ATTR_HOSTID,
 105         LEASE_ATTR_LEASETIME,
 106         LEASE_ATTR_NAME,
 107         LEASE_ATTR_MAX
 108 };
 109
 110 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 111         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 112         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 113         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 114         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 115         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 116         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 117 };
 118
 119 const struct uci_blob_param_list lease_attr_list = {
 120         .n_params = LEASE_ATTR_MAX,
 121         .params = lease_attrs,
 122 };
 123
 124 enum {
 125         ODHCPD_ATTR_MAINDHCP,
 126         ODHCPD_ATTR_LEASEFILE,
 127         ODHCPD_ATTR_LEASETRIGGER,
 128         ODHCPD_ATTR_LOGLEVEL,
 129         ODHCPD_ATTR_MAX
 130 };
 131
 132 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 133         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 134         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 135         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 136         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 137 };
 138
 139 const struct uci_blob_param_list odhcpd_attr_list = {
 140         .n_params = ODHCPD_ATTR_MAX,
 141         .params = odhcpd_attrs,
 142 };
 143
 144 static int mkdir_p(char *dir, mode_t mask)
 145 {
 146         char *l = strrchr(dir, '/');
 147         int ret;
 148
 149         if (!l)
 150                 return 0;
 151
 152         *l = '\0';
 153
 154         if (mkdir_p(dir, mask))
 155                 return -1;
 156
 157         *l = '/';
 158
 159         ret = mkdir(dir, mask);
 160         if (ret && errno == EEXIST)
 161                 return 0;
 162
 163         if (ret)
 164                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 165
 166         return ret;
 167 }
 168
 169 static void free_lease(struct lease *l)
 170 {
 171         if (l->head.next)
 172                 list_del(&l->head);
 173
 174         free(l->duid);
 175         free(l);
 176 }
 177
 178 static struct interface* get_interface(const char *name)
 179 {
 180         struct interface *c;
 181         list_for_each_entry(c, &interfaces, head)
 182                 if (!strcmp(c->name, name))
 183                         return c;
 184         return NULL;
 185 }
 186
 187 static void set_interface_defaults(struct interface *iface)
 188 {
 189         iface->managed = 1;
 190         iface->learn_routes = 1;
 191 }
 192
 193 static void clean_interface(struct interface *iface)
 194 {
 195         free(iface->dns);
 196         free(iface->search);
 197         free(iface->upstream);
 198         free(iface->dhcpv4_router);
 199         free(iface->dhcpv4_dns);
 200         free(iface->dhcpv6_raw);
 201         free(iface->filter_class);
 202         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 203         set_interface_defaults(iface);
 204 }
 205
 206 static void close_interface(struct interface *iface)
 207 {
 208         if (iface->head.next)
 209                 list_del(&iface->head);
 210
 211         setup_router_interface(iface, false);
 212         setup_dhcpv6_interface(iface, false);
 213         setup_ndp_interface(iface, false);
 214         setup_dhcpv4_interface(iface, false);
 215
 216         clean_interface(iface);
 217         free(iface);
 218 }
 219
 220 static int parse_mode(const char *mode)
 221 {
 222         if (!strcmp(mode, "disabled"))
 223                 return RELAYD_DISABLED;
 224         else if (!strcmp(mode, "server"))
 225                 return RELAYD_SERVER;
 226         else if (!strcmp(mode, "relay"))
 227                 return RELAYD_RELAY;
 228         else if (!strcmp(mode, "hybrid"))
 229                 return RELAYD_HYBRID;
 230         else
 231                 return -1;
 232 }
 233
 234 static void set_config(struct uci_section *s)
 235 {
 236         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 237
 238         blob_buf_init(&b, 0);
 239         uci_to_blob(&b, s, &odhcpd_attr_list);
 240         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 241
 242         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 243                 config.legacy = blobmsg_get_bool(c);
 244
 245         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 246                 free(config.dhcp_statefile);
 247                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 248         }
 249
 250         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 251                 free(config.dhcp_cb);
 252                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 253         }
 254
 255         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 256                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 257
 258                 if (config.log_level != log_level) {
 259                         config.log_level = log_level;
 260                         setlogmask(LOG_UPTO(config.log_level));
 261                 }
 262         }
 263 }
 264
 265 static double parse_leasetime(struct blob_attr *c) {
 266         char *val = blobmsg_get_string(c), *endptr = NULL;
 267         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 268
 269         if (time && endptr && endptr[0]) {
 270                 if (endptr[0] == 's')
 271                         time *= 1;
 272                 else if (endptr[0] == 'm')
 273                         time *= 60;
 274                 else if (endptr[0] == 'h')
 275                         time *= 3600;
 276                 else if (endptr[0] == 'd')
 277                         time *= 24 * 3600;
 278                 else if (endptr[0] == 'w')
 279                         time *= 7 * 24 * 3600;
 280                 else
 281                         goto err;
 282         }
 283
 284         if (time >= 60)
 285                 return time;
 286
 287         return 0;
 288
 289 err:
 290         return -1;
 291 }
 292
 293 static int set_lease(struct uci_section *s)
 294 {
 295         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 296
 297         blob_buf_init(&b, 0);
 298         uci_to_blob(&b, s, &lease_attr_list);
 299         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 300
 301         size_t hostlen = 1;
 302         if ((c = tb[LEASE_ATTR_NAME]))
 303                 hostlen = blobmsg_data_len(c);
 304
 305         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 306         if (!lease)
 307                 goto err;
 308
 309         if (hostlen > 1)
 310                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 311
 312         if ((c = tb[LEASE_ATTR_IP]))
 313                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 314                         goto err;
 315
 316         if ((c = tb[LEASE_ATTR_MAC]))
 317                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 318                         goto err;
 319
 320         if ((c = tb[LEASE_ATTR_DUID])) {
 321                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 322                 lease->duid = malloc(duidlen);
 323                 if (!lease->duid)
 324                         goto err;
 325
 326                 ssize_t len = odhcpd_unhexlify(lease->duid,
 327                                 duidlen, blobmsg_get_string(c));
 328
 329                 if (len < 0)
 330                         goto err;
 331
 332                 lease->duid_len = len;
 333         }
 334
 335         if ((c = tb[LEASE_ATTR_HOSTID])) {
 336                 errno = 0;
 337                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 338                 if (errno)
 339                         goto err;
 340         }
 341
 342         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 343                 double time = parse_leasetime(c);
 344                 if (time < 0)
 345                         goto err;
 346
 347                 if (time >= 60)
 348                         lease->dhcpv4_leasetime = time;
 349         }
 350
 351         list_add(&lease->head, &leases);
 352         return 0;
 353
 354 err:
 355         if (lease)
 356                 free_lease(lease);
 357
 358         return -1;
 359 }
 360
 361 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 362 {
 363         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 364         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 365
 366         if (tb[IFACE_ATTR_INTERFACE])
 367                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 368
 369         if (!name)
 370                 return -1;
 371
 372         struct interface *iface = get_interface(name);
 373         if (!iface) {
 374                 iface = calloc(1, sizeof(*iface));
 375                 if (!iface)
 376                         return -1;
 377
 378                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 379
 380                 set_interface_defaults(iface);
 381
 382                 list_add(&iface->head, &interfaces);
 383                 overwrite = true;
 384         }
 385
 386         const char *ifname = NULL;
 387         if (overwrite) {
 388                 if ((c = tb[IFACE_ATTR_IFNAME]))
 389                         ifname = blobmsg_get_string(c);
 390                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 391                         ifname = blobmsg_get_string(c);
 392         }
 393
 394 #ifdef WITH_UBUS
 395         if (overwrite || !iface->ifname[0])
 396                 ifname = ubus_get_ifname(name);
 397 #endif
 398
 399         if (!iface->ifname[0] && !ifname)
 400                 goto err;
 401
 402         if (ifname)
 403                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 404
 405         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 406                 goto err;
 407
 408         iface->inuse = true;
 409
 410         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 411                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 412
 413         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 414                 iface->ignore = blobmsg_get_bool(c);
 415
 416         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 417                 double time = parse_leasetime(c);
 418                 if (time < 0)
 419                         goto err;
 420
 421                 if (time >= 60)
 422                         iface->dhcpv4_leasetime = time;
 423         }
 424
 425         if ((c = tb[IFACE_ATTR_START])) {
 426                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 427
 428                 if (config.legacy)
 429                         iface->dhcpv4 = RELAYD_SERVER;
 430         }
 431
 432         if ((c = tb[IFACE_ATTR_LIMIT]))
 433                 iface->dhcpv4_end.s_addr = htonl(
 434                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 435
 436         if ((c = tb[IFACE_ATTR_MASTER]))
 437                 iface->master = blobmsg_get_bool(c);
 438
 439         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 440                 struct blob_attr *cur;
 441                 unsigned rem;
 442
 443                 blobmsg_for_each_attr(cur, c, rem) {
 444                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 445                                 continue;
 446
 447                         iface->upstream = realloc(iface->upstream,
 448                                         iface->upstream_len + blobmsg_data_len(cur));
 449                         if (!iface->upstream)
 450                                 goto err;
 451
 452                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 453                         iface->upstream_len += blobmsg_data_len(cur);
 454                 }
 455         }
 456
 457         int mode;
 458         if ((c = tb[IFACE_ATTR_RA])) {
 459                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 460                         iface->ra = mode;
 461                 else
 462                         goto err;
 463         }
 464
 465         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 466                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 467                         iface->dhcpv4 = mode;
 468                 else
 469                         goto err;
 470         }
 471
 472         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 473                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 474                         iface->dhcpv6 = mode;
 475                 else
 476                         goto err;
 477         }
 478
 479         if ((c = tb[IFACE_ATTR_NDP])) {
 480                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 481                         iface->ndp = mode;
 482                 else
 483                         goto err;
 484         }
 485
 486         if ((c = tb[IFACE_ATTR_ROUTER])) {
 487                 struct blob_attr *cur;
 488                 unsigned rem;
 489
 490                 blobmsg_for_each_attr(cur, c, rem) {
 491                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 492                                 continue;
 493
 494                         struct in_addr addr4;
 495                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 496                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 497                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 498                                 if (!iface->dhcpv4_router)
 499                                         goto err;
 500
 501                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 502                         } else
 503                                 goto err;
 504                 }
 505         }
 506
 507         if ((c = tb[IFACE_ATTR_DNS])) {
 508                 struct blob_attr *cur;
 509                 unsigned rem;
 510
 511                 iface->always_rewrite_dns = true;
 512                 blobmsg_for_each_attr(cur, c, rem) {
 513                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 514                                 continue;
 515
 516                         struct in_addr addr4;
 517                         struct in6_addr addr6;
 518                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 519                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 520                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 521                                 if (!iface->dhcpv4_dns)
 522                                         goto err;
 523
 524                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 525                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 526                                 iface->dns = realloc(iface->dns,
 527                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 528                                 if (!iface->dns)
 529                                         goto err;
 530
 531                                 iface->dns[iface->dns_cnt - 1] = addr6;
 532                         } else
 533                                 goto err;
 534                 }
 535         }
 536
 537         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 538                 struct blob_attr *cur;
 539                 unsigned rem;
 540
 541                 blobmsg_for_each_attr(cur, c, rem) {
 542                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 543                                 continue;
 544
 545                         uint8_t buf[256];
 546                         char *domain = blobmsg_get_string(cur);
 547                         size_t domainlen = strlen(domain);
 548                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 549                                 domain[domainlen - 1] = 0;
 550
 551                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 552                         if (len <= 0)
 553                                 goto err;
 554
 555                         iface->search = realloc(iface->search, iface->search_len + len);
 556                         if (!iface->search)
 557                                 goto err;
 558
 559                         memcpy(&iface->search[iface->search_len], buf, len);
 560                         iface->search_len += len;
 561                 }
 562         }
 563
 564         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 565                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 566                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 567         }
 568
 569         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 570                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 571                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 572                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 573         }
 574
 575         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 576                 iface->default_router = blobmsg_get_u32(c);
 577
 578         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 579                 iface->managed = blobmsg_get_u32(c);
 580
 581         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 582                 iface->ra_not_onlink = blobmsg_get_bool(c);
 583
 584         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 585                 iface->ra_advrouter = blobmsg_get_bool(c);
 586
 587         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 588                 iface->ra_maxinterval = blobmsg_get_u32(c);
 589
 590         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 591                 const char *prio = blobmsg_get_string(c);
 592
 593                 if (!strcmp(prio, "high"))
 594                         iface->route_preference = 1;
 595                 else if (!strcmp(prio, "low"))
 596                         iface->route_preference = -1;
 597                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 598                         iface->route_preference = 0;
 599                 else
 600                         goto err;
 601         }
 602
 603         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 604                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 605                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 606
 607         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 608                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 609                 goto err;
 610
 611         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 612                 iface->learn_routes = blobmsg_get_bool(c);
 613
 614         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 615                 iface->external = blobmsg_get_bool(c);
 616
 617         return 0;
 618
 619 err:
 620         close_interface(iface);
 621         return -1;
 622 }
 623
 624 static int set_interface(struct uci_section *s)
 625 {
 626         blob_buf_init(&b, 0);
 627         uci_to_blob(&b, s, &interface_attr_list);
 628
 629         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 630 }
 631
 632 void odhcpd_reload(void)
 633 {
 634         struct uci_context *uci = uci_alloc_context();
 635
 636         while (!list_empty(&leases))
 637                 free_lease(list_first_entry(&leases, struct lease, head));
 638
 639         struct interface *master = NULL, *i, *n;
 640
 641         if (!uci)
 642                 return;
 643
 644         list_for_each_entry(i, &interfaces, head)
 645                 clean_interface(i);
 646
 647         struct uci_package *dhcp = NULL;
 648         if (!uci_load(uci, "dhcp", &dhcp)) {
 649                 struct uci_element *e;
 650                 uci_foreach_element(&dhcp->sections, e) {
 651                         struct uci_section *s = uci_to_section(e);
 652                         if (!strcmp(s->type, "host"))
 653                                 set_lease(s);
 654                         else if (!strcmp(s->type, "odhcpd"))
 655                                 set_config(s);
 656                 }
 657
 658                 uci_foreach_element(&dhcp->sections, e) {
 659                         struct uci_section *s = uci_to_section(e);
 660                         if (!strcmp(s->type, "dhcp"))
 661                                 set_interface(s);
 662                 }
 663         }
 664
 665         if (config.dhcp_statefile) {
 666                 char *path = strdup(config.dhcp_statefile);
 667
 668                 mkdir_p(dirname(path), 0755);
 669                 free(path);
 670         }
 671
 672 #ifdef WITH_UBUS
 673         ubus_apply_network();
 674 #endif
 675
 676         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 677
 678         /* Test for */
 679         list_for_each_entry(i, &interfaces, head) {
 680                 if (i->master)
 681                         continue;
 682
 683                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 684                         any_dhcpv6_slave = true;
 685
 686                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 687                         any_ra_slave = true;
 688
 689                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 690                         any_ndp_slave = true;
 691         }
 692
 693         /* Evaluate hybrid mode for master */
 694         list_for_each_entry(i, &interfaces, head) {
 695                 if (!i->master)
 696                         continue;
 697
 698                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 699 #ifdef WITH_UBUS
 700                 if (!ubus_has_prefix(i->name, i->ifname))
 701                         hybrid_mode = RELAYD_RELAY;
 702 #endif
 703
 704                 if (i->dhcpv6 == RELAYD_HYBRID)
 705                         i->dhcpv6 = hybrid_mode;
 706
 707                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 708                         i->dhcpv6 = RELAYD_DISABLED;
 709
 710                 if (i->ra == RELAYD_HYBRID)
 711                         i->ra = hybrid_mode;
 712
 713                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 714                         i->ra = RELAYD_DISABLED;
 715
 716                 if (i->ndp == RELAYD_HYBRID)
 717                         i->ndp = hybrid_mode;
 718
 719                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 720                         i->ndp = RELAYD_DISABLED;
 721
 722                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 723                         master = i;
 724         }
 725
 726
 727         list_for_each_entry_safe(i, n, &interfaces, head) {
 728                 if (i->inuse) {
 729                         /* Resolve hybrid mode */
 730                         if (i->dhcpv6 == RELAYD_HYBRID)
 731                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 732                                                 RELAYD_RELAY : RELAYD_SERVER;
 733
 734                         if (i->ra == RELAYD_HYBRID)
 735                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 736                                                 RELAYD_RELAY : RELAYD_SERVER;
 737
 738                         if (i->ndp == RELAYD_HYBRID)
 739                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 740                                                 RELAYD_RELAY : RELAYD_DISABLED;
 741
 742                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 743                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 744                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 745                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 746                 } else {
 747                         close_interface(i);
 748                 }
 749         }
 750
 751         uci_unload(uci, dhcp);
 752         uci_free_context(uci);
 753 }
 754
 755 static void handle_signal(int signal)
 756 {
 757         char b[1] = {0};
 758
 759         if (signal == SIGHUP) {
 760                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 761         } else
 762                 uloop_end();
 763 }
 764
 765 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 766 {
 767         char b[512];
 768         if (read(u->fd, b, sizeof(b)) < 0) {}
 769
 770         odhcpd_reload();
 771 }
 772
 773 static struct uloop_fd reload_fd = { .cb = reload_cb };
 774
 775 void odhcpd_run(void)
 776 {
 777         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 778
 779         reload_fd.fd = reload_pipe[0];
 780         uloop_fd_add(&reload_fd, ULOOP_READ);
 781
 782         signal(SIGTERM, handle_signal);
 783         signal(SIGINT, handle_signal);
 784         signal(SIGHUP, handle_signal);
 785
 786 #ifdef WITH_UBUS
 787         while (init_ubus())
 788                 sleep(1);
 789 #endif
 790
 791         odhcpd_reload();
 792         uloop_run();
 793
 794         while (!list_empty(&interfaces))
 795                 close_interface(list_first_entry(&interfaces, struct interface, head));
 796 }
 797