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_DHCPV6_ASSIGNALL,
  44         IFACE_ATTR_RA_DEFAULT,
  45         IFACE_ATTR_RA_MANAGEMENT,
  46         IFACE_ATTR_RA_OFFLINK,
  47         IFACE_ATTR_RA_PREFERENCE,
  48         IFACE_ATTR_RA_ADVROUTER,
  49         IFACE_ATTR_RA_MININTERVAL,
  50         IFACE_ATTR_RA_MAXINTERVAL,
  51         IFACE_ATTR_RA_LIFETIME,
  52         IFACE_ATTR_RA_USELEASETIME,
  53         IFACE_ATTR_PD_MANAGER,
  54         IFACE_ATTR_PD_CER,
  55         IFACE_ATTR_NDPROXY_ROUTING,
  56         IFACE_ATTR_NDPROXY_SLAVE,
  57         IFACE_ATTR_MAX
  58 };
  59
  60 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  61         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  65         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  68         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  71         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  76         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  81         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  84         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  85         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  86         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  88         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  89         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  92         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  94 };
  95
  96 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  97         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 100 };
 101
 102 const struct uci_blob_param_list interface_attr_list = {
 103         .n_params = IFACE_ATTR_MAX,
 104         .params = iface_attrs,
 105         .info = iface_attr_info,
 106 };
 107
 108 enum {
 109         LEASE_ATTR_IP,
 110         LEASE_ATTR_MAC,
 111         LEASE_ATTR_DUID,
 112         LEASE_ATTR_HOSTID,
 113         LEASE_ATTR_LEASETIME,
 114         LEASE_ATTR_NAME,
 115         LEASE_ATTR_MAX
 116 };
 117
 118 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 119         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 120         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 121         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 122         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 123         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 124         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 125 };
 126
 127 const struct uci_blob_param_list lease_attr_list = {
 128         .n_params = LEASE_ATTR_MAX,
 129         .params = lease_attrs,
 130 };
 131
 132 enum {
 133         ODHCPD_ATTR_MAINDHCP,
 134         ODHCPD_ATTR_LEASEFILE,
 135         ODHCPD_ATTR_LEASETRIGGER,
 136         ODHCPD_ATTR_LOGLEVEL,
 137         ODHCPD_ATTR_MAX
 138 };
 139
 140 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 141         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 142         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 143         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 144         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 145 };
 146
 147 const struct uci_blob_param_list odhcpd_attr_list = {
 148         .n_params = ODHCPD_ATTR_MAX,
 149         .params = odhcpd_attrs,
 150 };
 151
 152 static int mkdir_p(char *dir, mode_t mask)
 153 {
 154         char *l = strrchr(dir, '/');
 155         int ret;
 156
 157         if (!l)
 158                 return 0;
 159
 160         *l = '\0';
 161
 162         if (mkdir_p(dir, mask))
 163                 return -1;
 164
 165         *l = '/';
 166
 167         ret = mkdir(dir, mask);
 168         if (ret && errno == EEXIST)
 169                 return 0;
 170
 171         if (ret)
 172                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 173
 174         return ret;
 175 }
 176
 177 static void free_lease(struct lease *l)
 178 {
 179         if (l->head.next)
 180                 list_del(&l->head);
 181
 182         free(l->duid);
 183         free(l);
 184 }
 185
 186 static struct interface* get_interface(const char *name)
 187 {
 188         struct interface *c;
 189         list_for_each_entry(c, &interfaces, head)
 190                 if (!strcmp(c->name, name))
 191                         return c;
 192         return NULL;
 193 }
 194
 195 static void set_interface_defaults(struct interface *iface)
 196 {
 197         iface->managed = 1;
 198         iface->learn_routes = 1;
 199         iface->dhcpv4_leasetime = 43200;
 200         iface->dhcpv6_assignall = true;
 201         iface->ra_maxinterval = 600;
 202         iface->ra_mininterval = iface->ra_maxinterval/3;
 203         iface->ra_lifetime = -1;
 204 }
 205
 206 static void clean_interface(struct interface *iface)
 207 {
 208         free(iface->dns);
 209         free(iface->search);
 210         free(iface->upstream);
 211         free(iface->dhcpv4_router);
 212         free(iface->dhcpv4_dns);
 213         free(iface->dhcpv6_raw);
 214         free(iface->filter_class);
 215         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 216         set_interface_defaults(iface);
 217 }
 218
 219 static void close_interface(struct interface *iface)
 220 {
 221         if (iface->head.next)
 222                 list_del(&iface->head);
 223
 224         setup_router_interface(iface, false);
 225         setup_dhcpv6_interface(iface, false);
 226         setup_ndp_interface(iface, false);
 227         setup_dhcpv4_interface(iface, false);
 228
 229         clean_interface(iface);
 230         free(iface);
 231 }
 232
 233 static int parse_mode(const char *mode)
 234 {
 235         if (!strcmp(mode, "disabled"))
 236                 return RELAYD_DISABLED;
 237         else if (!strcmp(mode, "server"))
 238                 return RELAYD_SERVER;
 239         else if (!strcmp(mode, "relay"))
 240                 return RELAYD_RELAY;
 241         else if (!strcmp(mode, "hybrid"))
 242                 return RELAYD_HYBRID;
 243         else
 244                 return -1;
 245 }
 246
 247 static void set_config(struct uci_section *s)
 248 {
 249         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 250
 251         blob_buf_init(&b, 0);
 252         uci_to_blob(&b, s, &odhcpd_attr_list);
 253         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 254
 255         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 256                 config.legacy = blobmsg_get_bool(c);
 257
 258         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 259                 free(config.dhcp_statefile);
 260                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 261         }
 262
 263         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 264                 free(config.dhcp_cb);
 265                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 266         }
 267
 268         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 269                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 270
 271                 if (config.log_level != log_level) {
 272                         config.log_level = log_level;
 273                         setlogmask(LOG_UPTO(config.log_level));
 274                 }
 275         }
 276 }
 277
 278 static double parse_leasetime(struct blob_attr *c) {
 279         char *val = blobmsg_get_string(c), *endptr = NULL;
 280         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 281
 282         if (time && endptr && endptr[0]) {
 283                 if (endptr[0] == 's')
 284                         time *= 1;
 285                 else if (endptr[0] == 'm')
 286                         time *= 60;
 287                 else if (endptr[0] == 'h')
 288                         time *= 3600;
 289                 else if (endptr[0] == 'd')
 290                         time *= 24 * 3600;
 291                 else if (endptr[0] == 'w')
 292                         time *= 7 * 24 * 3600;
 293                 else
 294                         goto err;
 295         }
 296
 297         if (time < 60)
 298                 time = 60;
 299
 300         return time;
 301
 302 err:
 303         return -1;
 304 }
 305
 306 static int set_lease(struct uci_section *s)
 307 {
 308         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 309
 310         blob_buf_init(&b, 0);
 311         uci_to_blob(&b, s, &lease_attr_list);
 312         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 313
 314         size_t hostlen = 1;
 315         if ((c = tb[LEASE_ATTR_NAME]))
 316                 hostlen = blobmsg_data_len(c);
 317
 318         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 319         if (!lease)
 320                 goto err;
 321
 322         if (hostlen > 1)
 323                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 324
 325         if ((c = tb[LEASE_ATTR_IP]))
 326                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 327                         goto err;
 328
 329         if ((c = tb[LEASE_ATTR_MAC]))
 330                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 331                         goto err;
 332
 333         if ((c = tb[LEASE_ATTR_DUID])) {
 334                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 335                 lease->duid = malloc(duidlen);
 336                 if (!lease->duid)
 337                         goto err;
 338
 339                 ssize_t len = odhcpd_unhexlify(lease->duid,
 340                                 duidlen, blobmsg_get_string(c));
 341
 342                 if (len < 0)
 343                         goto err;
 344
 345                 lease->duid_len = len;
 346         }
 347
 348         if ((c = tb[LEASE_ATTR_HOSTID])) {
 349                 errno = 0;
 350                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 351                 if (errno)
 352                         goto err;
 353         }
 354
 355         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 356                 double time = parse_leasetime(c);
 357                 if (time < 0)
 358                         goto err;
 359
 360                 lease->dhcpv4_leasetime = time;
 361         }
 362
 363         list_add(&lease->head, &leases);
 364         return 0;
 365
 366 err:
 367         if (lease)
 368                 free_lease(lease);
 369
 370         return -1;
 371 }
 372
 373 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 374 {
 375         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 376         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 377
 378         if (tb[IFACE_ATTR_INTERFACE])
 379                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 380
 381         if (!name)
 382                 return -1;
 383
 384         struct interface *iface = get_interface(name);
 385         if (!iface) {
 386                 iface = calloc(1, sizeof(*iface));
 387                 if (!iface)
 388                         return -1;
 389
 390                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 391
 392                 set_interface_defaults(iface);
 393
 394                 list_add(&iface->head, &interfaces);
 395                 overwrite = true;
 396         }
 397
 398         const char *ifname = NULL;
 399         if (overwrite) {
 400                 if ((c = tb[IFACE_ATTR_IFNAME]))
 401                         ifname = blobmsg_get_string(c);
 402                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 403                         ifname = blobmsg_get_string(c);
 404         }
 405
 406 #ifdef WITH_UBUS
 407         if (overwrite || !iface->ifname[0])
 408                 ifname = ubus_get_ifname(name);
 409 #endif
 410
 411         if (!iface->ifname[0] && !ifname)
 412                 goto err;
 413
 414         if (ifname)
 415                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 416
 417         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 418                 goto err;
 419
 420         iface->inuse = true;
 421
 422         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 423                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 424
 425         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 426                 iface->ignore = blobmsg_get_bool(c);
 427
 428         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 429                 double time = parse_leasetime(c);
 430                 if (time < 0)
 431                         goto err;
 432
 433                 iface->dhcpv4_leasetime = time;
 434         }
 435
 436         if ((c = tb[IFACE_ATTR_START])) {
 437                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 438
 439                 if (config.legacy)
 440                         iface->dhcpv4 = RELAYD_SERVER;
 441         }
 442
 443         if ((c = tb[IFACE_ATTR_LIMIT]))
 444                 iface->dhcpv4_end.s_addr = htonl(
 445                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 446
 447         if ((c = tb[IFACE_ATTR_MASTER]))
 448                 iface->master = blobmsg_get_bool(c);
 449
 450         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 451                 struct blob_attr *cur;
 452                 unsigned rem;
 453
 454                 blobmsg_for_each_attr(cur, c, rem) {
 455                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 456                                 continue;
 457
 458                         iface->upstream = realloc(iface->upstream,
 459                                         iface->upstream_len + blobmsg_data_len(cur));
 460                         if (!iface->upstream)
 461                                 goto err;
 462
 463                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 464                         iface->upstream_len += blobmsg_data_len(cur);
 465                 }
 466         }
 467
 468         int mode;
 469         if ((c = tb[IFACE_ATTR_RA])) {
 470                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 471                         iface->ra = mode;
 472                 else
 473                         goto err;
 474         }
 475
 476         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 477                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 478                         iface->dhcpv4 = mode;
 479                 else
 480                         goto err;
 481         }
 482
 483         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 484                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 485                         iface->dhcpv6 = mode;
 486                 else
 487                         goto err;
 488         }
 489
 490         if ((c = tb[IFACE_ATTR_NDP])) {
 491                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 492                         iface->ndp = mode;
 493                 else
 494                         goto err;
 495         }
 496
 497         if ((c = tb[IFACE_ATTR_ROUTER])) {
 498                 struct blob_attr *cur;
 499                 unsigned rem;
 500
 501                 blobmsg_for_each_attr(cur, c, rem) {
 502                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 503                                 continue;
 504
 505                         struct in_addr addr4;
 506                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 507                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 508                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 509                                 if (!iface->dhcpv4_router)
 510                                         goto err;
 511
 512                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 513                         } else
 514                                 goto err;
 515                 }
 516         }
 517
 518         if ((c = tb[IFACE_ATTR_DNS])) {
 519                 struct blob_attr *cur;
 520                 unsigned rem;
 521
 522                 iface->always_rewrite_dns = true;
 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                         struct in_addr addr4;
 528                         struct in6_addr addr6;
 529                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 530                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 531                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 532                                 if (!iface->dhcpv4_dns)
 533                                         goto err;
 534
 535                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 536                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 537                                 iface->dns = realloc(iface->dns,
 538                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 539                                 if (!iface->dns)
 540                                         goto err;
 541
 542                                 iface->dns[iface->dns_cnt - 1] = addr6;
 543                         } else
 544                                 goto err;
 545                 }
 546         }
 547
 548         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 549                 struct blob_attr *cur;
 550                 unsigned rem;
 551
 552                 blobmsg_for_each_attr(cur, c, rem) {
 553                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 554                                 continue;
 555
 556                         uint8_t buf[256];
 557                         char *domain = blobmsg_get_string(cur);
 558                         size_t domainlen = strlen(domain);
 559                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 560                                 domain[domainlen - 1] = 0;
 561
 562                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 563                         if (len <= 0)
 564                                 goto err;
 565
 566                         iface->search = realloc(iface->search, iface->search_len + len);
 567                         if (!iface->search)
 568                                 goto err;
 569
 570                         memcpy(&iface->search[iface->search_len], buf, len);
 571                         iface->search_len += len;
 572                 }
 573         }
 574
 575         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 576                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 577                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 578         }
 579
 580         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 581                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 582                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 583                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 584         }
 585
 586         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 587                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 588
 589         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 590                 iface->default_router = blobmsg_get_u32(c);
 591
 592         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 593                 iface->managed = blobmsg_get_u32(c);
 594
 595         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 596                 iface->ra_not_onlink = blobmsg_get_bool(c);
 597
 598         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 599                 iface->ra_advrouter = blobmsg_get_bool(c);
 600
 601         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 602                 iface->ra_mininterval =  blobmsg_get_u32(c);
 603
 604         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 605                 iface->ra_maxinterval = blobmsg_get_u32(c);
 606
 607         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 608                 iface->ra_lifetime = blobmsg_get_u32(c);
 609
 610         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 611                 iface->ra_useleasetime = blobmsg_get_bool(c);
 612
 613         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 614                 const char *prio = blobmsg_get_string(c);
 615
 616                 if (!strcmp(prio, "high"))
 617                         iface->route_preference = 1;
 618                 else if (!strcmp(prio, "low"))
 619                         iface->route_preference = -1;
 620                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 621                         iface->route_preference = 0;
 622                 else
 623                         goto err;
 624         }
 625
 626         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 627                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 628                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 629
 630         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 631                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 632                 goto err;
 633
 634         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 635                 iface->learn_routes = blobmsg_get_bool(c);
 636
 637         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 638                 iface->external = blobmsg_get_bool(c);
 639
 640         return 0;
 641
 642 err:
 643         close_interface(iface);
 644         return -1;
 645 }
 646
 647 static int set_interface(struct uci_section *s)
 648 {
 649         blob_buf_init(&b, 0);
 650         uci_to_blob(&b, s, &interface_attr_list);
 651
 652         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 653 }
 654
 655 void odhcpd_reload(void)
 656 {
 657         struct uci_context *uci = uci_alloc_context();
 658
 659         while (!list_empty(&leases))
 660                 free_lease(list_first_entry(&leases, struct lease, head));
 661
 662         struct interface *master = NULL, *i, *n;
 663
 664         if (!uci)
 665                 return;
 666
 667         list_for_each_entry(i, &interfaces, head)
 668                 clean_interface(i);
 669
 670         struct uci_package *dhcp = NULL;
 671         if (!uci_load(uci, "dhcp", &dhcp)) {
 672                 struct uci_element *e;
 673                 uci_foreach_element(&dhcp->sections, e) {
 674                         struct uci_section *s = uci_to_section(e);
 675                         if (!strcmp(s->type, "host"))
 676                                 set_lease(s);
 677                         else if (!strcmp(s->type, "odhcpd"))
 678                                 set_config(s);
 679                 }
 680
 681                 uci_foreach_element(&dhcp->sections, e) {
 682                         struct uci_section *s = uci_to_section(e);
 683                         if (!strcmp(s->type, "dhcp"))
 684                                 set_interface(s);
 685                 }
 686         }
 687
 688         if (config.dhcp_statefile) {
 689                 char *path = strdup(config.dhcp_statefile);
 690
 691                 mkdir_p(dirname(path), 0755);
 692                 free(path);
 693         }
 694
 695 #ifdef WITH_UBUS
 696         ubus_apply_network();
 697 #endif
 698
 699         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 700
 701         /* Test for */
 702         list_for_each_entry(i, &interfaces, head) {
 703                 if (i->master)
 704                         continue;
 705
 706                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 707                         any_dhcpv6_slave = true;
 708
 709                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 710                         any_ra_slave = true;
 711
 712                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 713                         any_ndp_slave = true;
 714         }
 715
 716         /* Evaluate hybrid mode for master */
 717         list_for_each_entry(i, &interfaces, head) {
 718                 if (!i->master)
 719                         continue;
 720
 721                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 722 #ifdef WITH_UBUS
 723                 if (!ubus_has_prefix(i->name, i->ifname))
 724                         hybrid_mode = RELAYD_RELAY;
 725 #endif
 726
 727                 if (i->dhcpv6 == RELAYD_HYBRID)
 728                         i->dhcpv6 = hybrid_mode;
 729
 730                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 731                         i->dhcpv6 = RELAYD_DISABLED;
 732
 733                 if (i->ra == RELAYD_HYBRID)
 734                         i->ra = hybrid_mode;
 735
 736                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 737                         i->ra = RELAYD_DISABLED;
 738
 739                 if (i->ndp == RELAYD_HYBRID)
 740                         i->ndp = hybrid_mode;
 741
 742                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 743                         i->ndp = RELAYD_DISABLED;
 744
 745                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 746                         master = i;
 747         }
 748
 749
 750         list_for_each_entry_safe(i, n, &interfaces, head) {
 751                 if (i->inuse) {
 752                         /* Resolve hybrid mode */
 753                         if (i->dhcpv6 == RELAYD_HYBRID)
 754                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 755                                                 RELAYD_RELAY : RELAYD_SERVER;
 756
 757                         if (i->ra == RELAYD_HYBRID)
 758                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 759                                                 RELAYD_RELAY : RELAYD_SERVER;
 760
 761                         if (i->ndp == RELAYD_HYBRID)
 762                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 763                                                 RELAYD_RELAY : RELAYD_DISABLED;
 764
 765                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 766                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 767                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 768                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 769                 } else
 770                         close_interface(i);
 771         }
 772
 773         ndp_handle_addr6_dump();
 774         uci_unload(uci, dhcp);
 775         uci_free_context(uci);
 776 }
 777
 778 static void handle_signal(int signal)
 779 {
 780         char b[1] = {0};
 781
 782         if (signal == SIGHUP) {
 783                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 784         } else
 785                 uloop_end();
 786 }
 787
 788 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 789 {
 790         char b[512];
 791         if (read(u->fd, b, sizeof(b)) < 0) {}
 792
 793         odhcpd_reload();
 794 }
 795
 796 static struct uloop_fd reload_fd = { .cb = reload_cb };
 797
 798 void odhcpd_run(void)
 799 {
 800         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 801
 802         reload_fd.fd = reload_pipe[0];
 803         uloop_fd_add(&reload_fd, ULOOP_READ);
 804
 805         signal(SIGTERM, handle_signal);
 806         signal(SIGINT, handle_signal);
 807         signal(SIGHUP, handle_signal);
 808
 809 #ifdef WITH_UBUS
 810         while (init_ubus())
 811                 sleep(1);
 812 #endif
 813
 814         odhcpd_reload();
 815         uloop_run();
 816
 817         while (!list_empty(&interfaces))
 818                 close_interface(list_first_entry(&interfaces, struct interface, head));
 819 }
 820