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, .main_dhcpv4 = false,
  21                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  22                         .log_level = LOG_INFO};
  23
  24 enum {
  25         IFACE_ATTR_INTERFACE,
  26         IFACE_ATTR_IFNAME,
  27         IFACE_ATTR_NETWORKID,
  28         IFACE_ATTR_DYNAMICDHCP,
  29         IFACE_ATTR_IGNORE,
  30         IFACE_ATTR_LEASETIME,
  31         IFACE_ATTR_LIMIT,
  32         IFACE_ATTR_START,
  33         IFACE_ATTR_MASTER,
  34         IFACE_ATTR_UPSTREAM,
  35         IFACE_ATTR_RA,
  36         IFACE_ATTR_DHCPV4,
  37         IFACE_ATTR_DHCPV6,
  38         IFACE_ATTR_NDP,
  39         IFACE_ATTR_ROUTER,
  40         IFACE_ATTR_DNS,
  41         IFACE_ATTR_DOMAIN,
  42         IFACE_ATTR_FILTER_CLASS,
  43         IFACE_ATTR_DHCPV6_RAW,
  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_RA_MTU,
  54         IFACE_ATTR_PD_MANAGER,
  55         IFACE_ATTR_PD_CER,
  56         IFACE_ATTR_NDPROXY_ROUTING,
  57         IFACE_ATTR_NDPROXY_SLAVE,
  58         IFACE_ATTR_MAX
  59 };
  60
  61 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  62         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  70         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  71         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  72         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  79         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  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_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
  93         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  95 };
  96
  97 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  98         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 100         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 101 };
 102
 103 const struct uci_blob_param_list interface_attr_list = {
 104         .n_params = IFACE_ATTR_MAX,
 105         .params = iface_attrs,
 106         .info = iface_attr_info,
 107 };
 108
 109 enum {
 110         LEASE_ATTR_IP,
 111         LEASE_ATTR_MAC,
 112         LEASE_ATTR_DUID,
 113         LEASE_ATTR_HOSTID,
 114         LEASE_ATTR_LEASETIME,
 115         LEASE_ATTR_NAME,
 116         LEASE_ATTR_MAX
 117 };
 118
 119 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 120         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 121         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 122         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 123         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 124         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 125         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 126 };
 127
 128 const struct uci_blob_param_list lease_attr_list = {
 129         .n_params = LEASE_ATTR_MAX,
 130         .params = lease_attrs,
 131 };
 132
 133 enum {
 134         ODHCPD_ATTR_LEGACY,
 135         ODHCPD_ATTR_MAINDHCP,
 136         ODHCPD_ATTR_LEASEFILE,
 137         ODHCPD_ATTR_LEASETRIGGER,
 138         ODHCPD_ATTR_LOGLEVEL,
 139         ODHCPD_ATTR_MAX
 140 };
 141
 142 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 143         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 144         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 145         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 146         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 147         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 148 };
 149
 150 const struct uci_blob_param_list odhcpd_attr_list = {
 151         .n_params = ODHCPD_ATTR_MAX,
 152         .params = odhcpd_attrs,
 153 };
 154
 155 static int mkdir_p(char *dir, mode_t mask)
 156 {
 157         char *l = strrchr(dir, '/');
 158         int ret;
 159
 160         if (!l)
 161                 return 0;
 162
 163         *l = '\0';
 164
 165         if (mkdir_p(dir, mask))
 166                 return -1;
 167
 168         *l = '/';
 169
 170         ret = mkdir(dir, mask);
 171         if (ret && errno == EEXIST)
 172                 return 0;
 173
 174         if (ret)
 175                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 176
 177         return ret;
 178 }
 179
 180 static void free_lease(struct lease *l)
 181 {
 182         if (l->head.next)
 183                 list_del(&l->head);
 184
 185         free(l->duid);
 186         free(l);
 187 }
 188
 189 static struct interface* get_interface(const char *name)
 190 {
 191         struct interface *c;
 192         list_for_each_entry(c, &interfaces, head)
 193                 if (!strcmp(c->name, name))
 194                         return c;
 195         return NULL;
 196 }
 197
 198 static void set_interface_defaults(struct interface *iface)
 199 {
 200         iface->managed = 1;
 201         iface->learn_routes = 1;
 202         iface->dhcpv4_leasetime = 43200;
 203         iface->ra_maxinterval = 600;
 204         iface->ra_mininterval = iface->ra_maxinterval/3;
 205         iface->ra_lifetime = -1;
 206 }
 207
 208 static void clean_interface(struct interface *iface)
 209 {
 210         free(iface->dns);
 211         free(iface->search);
 212         free(iface->upstream);
 213         free(iface->dhcpv4_router);
 214         free(iface->dhcpv4_dns);
 215         free(iface->dhcpv6_raw);
 216         free(iface->filter_class);
 217         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 218         set_interface_defaults(iface);
 219 }
 220
 221 static void close_interface(struct interface *iface)
 222 {
 223         if (iface->head.next)
 224                 list_del(&iface->head);
 225
 226         setup_router_interface(iface, false);
 227         setup_dhcpv6_interface(iface, false);
 228         setup_ndp_interface(iface, false);
 229         setup_dhcpv4_interface(iface, false);
 230
 231         clean_interface(iface);
 232         free(iface);
 233 }
 234
 235 static int parse_mode(const char *mode)
 236 {
 237         if (!strcmp(mode, "disabled"))
 238                 return RELAYD_DISABLED;
 239         else if (!strcmp(mode, "server"))
 240                 return RELAYD_SERVER;
 241         else if (!strcmp(mode, "relay"))
 242                 return RELAYD_RELAY;
 243         else if (!strcmp(mode, "hybrid"))
 244                 return RELAYD_HYBRID;
 245         else
 246                 return -1;
 247 }
 248
 249 static void set_config(struct uci_section *s)
 250 {
 251         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 252
 253         blob_buf_init(&b, 0);
 254         uci_to_blob(&b, s, &odhcpd_attr_list);
 255         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 256
 257         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 258                 config.legacy = blobmsg_get_bool(c);
 259
 260         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 261                 config.main_dhcpv4 = blobmsg_get_bool(c);
 262
 263         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 264                 free(config.dhcp_statefile);
 265                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 266         }
 267
 268         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 269                 free(config.dhcp_cb);
 270                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 271         }
 272
 273         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 274                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 275
 276                 if (config.log_level != log_level) {
 277                         config.log_level = log_level;
 278                         setlogmask(LOG_UPTO(config.log_level));
 279                 }
 280         }
 281 }
 282
 283 static double parse_leasetime(struct blob_attr *c) {
 284         char *val = blobmsg_get_string(c), *endptr = NULL;
 285         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 286
 287         if (time && endptr && endptr[0]) {
 288                 if (endptr[0] == 's')
 289                         time *= 1;
 290                 else if (endptr[0] == 'm')
 291                         time *= 60;
 292                 else if (endptr[0] == 'h')
 293                         time *= 3600;
 294                 else if (endptr[0] == 'd')
 295                         time *= 24 * 3600;
 296                 else if (endptr[0] == 'w')
 297                         time *= 7 * 24 * 3600;
 298                 else
 299                         goto err;
 300         }
 301
 302         if (time < 60)
 303                 time = 60;
 304
 305         return time;
 306
 307 err:
 308         return -1;
 309 }
 310
 311 static int set_lease(struct uci_section *s)
 312 {
 313         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 314
 315         blob_buf_init(&b, 0);
 316         uci_to_blob(&b, s, &lease_attr_list);
 317         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 318
 319         size_t hostlen = 1;
 320         if ((c = tb[LEASE_ATTR_NAME]))
 321                 hostlen = blobmsg_data_len(c);
 322
 323         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 324         if (!lease)
 325                 goto err;
 326
 327         if (hostlen > 1)
 328                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 329
 330         if ((c = tb[LEASE_ATTR_IP]))
 331                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 332                         goto err;
 333
 334         if ((c = tb[LEASE_ATTR_MAC]))
 335                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 336                         goto err;
 337
 338         if ((c = tb[LEASE_ATTR_DUID])) {
 339                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 340                 lease->duid = malloc(duidlen);
 341                 if (!lease->duid)
 342                         goto err;
 343
 344                 ssize_t len = odhcpd_unhexlify(lease->duid,
 345                                 duidlen, blobmsg_get_string(c));
 346
 347                 if (len < 0)
 348                         goto err;
 349
 350                 lease->duid_len = len;
 351         }
 352
 353         if ((c = tb[LEASE_ATTR_HOSTID])) {
 354                 errno = 0;
 355                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 356                 if (errno)
 357                         goto err;
 358         }
 359
 360         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 361                 double time = parse_leasetime(c);
 362                 if (time < 0)
 363                         goto err;
 364
 365                 lease->dhcpv4_leasetime = time;
 366         }
 367
 368         list_add(&lease->head, &leases);
 369         return 0;
 370
 371 err:
 372         if (lease)
 373                 free_lease(lease);
 374
 375         return -1;
 376 }
 377
 378 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 379 {
 380         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 381         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 382
 383         if (tb[IFACE_ATTR_INTERFACE])
 384                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 385
 386         if (!name)
 387                 return -1;
 388
 389         struct interface *iface = get_interface(name);
 390         if (!iface) {
 391                 iface = calloc(1, sizeof(*iface));
 392                 if (!iface)
 393                         return -1;
 394
 395                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 396
 397                 set_interface_defaults(iface);
 398
 399                 list_add(&iface->head, &interfaces);
 400                 overwrite = true;
 401         }
 402
 403         const char *ifname = NULL;
 404         if (overwrite) {
 405                 if ((c = tb[IFACE_ATTR_IFNAME]))
 406                         ifname = blobmsg_get_string(c);
 407                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 408                         ifname = blobmsg_get_string(c);
 409         }
 410
 411 #ifdef WITH_UBUS
 412         if (overwrite || !iface->ifname[0])
 413                 ifname = ubus_get_ifname(name);
 414 #endif
 415
 416         if (!iface->ifname[0] && !ifname)
 417                 goto err;
 418
 419         if (ifname)
 420                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 421
 422         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 423                 goto err;
 424
 425         iface->inuse = true;
 426
 427         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 428                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 429
 430         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 431                 iface->ignore = blobmsg_get_bool(c);
 432
 433         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 434                 double time = parse_leasetime(c);
 435                 if (time < 0)
 436                         goto err;
 437
 438                 iface->dhcpv4_leasetime = time;
 439         }
 440
 441         if ((c = tb[IFACE_ATTR_START])) {
 442                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 443
 444                 if (config.main_dhcpv4 && config.legacy)
 445                         iface->dhcpv4 = RELAYD_SERVER;
 446         }
 447
 448         if ((c = tb[IFACE_ATTR_LIMIT]))
 449                 iface->dhcpv4_end.s_addr = htonl(
 450                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 451
 452         if ((c = tb[IFACE_ATTR_MASTER]))
 453                 iface->master = blobmsg_get_bool(c);
 454
 455         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 456                 struct blob_attr *cur;
 457                 unsigned rem;
 458
 459                 blobmsg_for_each_attr(cur, c, rem) {
 460                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 461                                 continue;
 462
 463                         iface->upstream = realloc(iface->upstream,
 464                                         iface->upstream_len + blobmsg_data_len(cur));
 465                         if (!iface->upstream)
 466                                 goto err;
 467
 468                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 469                         iface->upstream_len += blobmsg_data_len(cur);
 470                 }
 471         }
 472
 473         int mode;
 474         if ((c = tb[IFACE_ATTR_RA])) {
 475                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 476                         iface->ra = mode;
 477                 else
 478                         goto err;
 479         }
 480
 481         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 482                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 483                         if (config.main_dhcpv4)
 484                                 iface->dhcpv4 = mode;
 485                 }
 486                 else
 487                         goto err;
 488         }
 489
 490         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 491                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 492                         iface->dhcpv6 = mode;
 493                 else
 494                         goto err;
 495         }
 496
 497         if ((c = tb[IFACE_ATTR_NDP])) {
 498                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 499                         iface->ndp = mode;
 500                 else
 501                         goto err;
 502         }
 503
 504         if ((c = tb[IFACE_ATTR_ROUTER])) {
 505                 struct blob_attr *cur;
 506                 unsigned rem;
 507
 508                 blobmsg_for_each_attr(cur, c, rem) {
 509                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 510                                 continue;
 511
 512                         struct in_addr addr4;
 513                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 514                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 515                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 516                                 if (!iface->dhcpv4_router)
 517                                         goto err;
 518
 519                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 520                         } else
 521                                 goto err;
 522                 }
 523         }
 524
 525         if ((c = tb[IFACE_ATTR_DNS])) {
 526                 struct blob_attr *cur;
 527                 unsigned rem;
 528
 529                 iface->always_rewrite_dns = true;
 530                 blobmsg_for_each_attr(cur, c, rem) {
 531                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 532                                 continue;
 533
 534                         struct in_addr addr4;
 535                         struct in6_addr addr6;
 536                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 537                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 538                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 539                                 if (!iface->dhcpv4_dns)
 540                                         goto err;
 541
 542                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 543                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 544                                 iface->dns = realloc(iface->dns,
 545                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 546                                 if (!iface->dns)
 547                                         goto err;
 548
 549                                 iface->dns[iface->dns_cnt - 1] = addr6;
 550                         } else
 551                                 goto err;
 552                 }
 553         }
 554
 555         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 556                 struct blob_attr *cur;
 557                 unsigned rem;
 558
 559                 blobmsg_for_each_attr(cur, c, rem) {
 560                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 561                                 continue;
 562
 563                         uint8_t buf[256];
 564                         char *domain = blobmsg_get_string(cur);
 565                         size_t domainlen = strlen(domain);
 566                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 567                                 domain[domainlen - 1] = 0;
 568
 569                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 570                         if (len <= 0)
 571                                 goto err;
 572
 573                         iface->search = realloc(iface->search, iface->search_len + len);
 574                         if (!iface->search)
 575                                 goto err;
 576
 577                         memcpy(&iface->search[iface->search_len], buf, len);
 578                         iface->search_len += len;
 579                 }
 580         }
 581
 582         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 583                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 584                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 585         }
 586
 587         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 588                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 589                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 590                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 591         }
 592
 593         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 594                 iface->default_router = blobmsg_get_u32(c);
 595
 596         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 597                 iface->managed = blobmsg_get_u32(c);
 598
 599         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 600                 iface->ra_mtu = blobmsg_get_u32(c);
 601                 if (iface->ra_mtu < 1280)
 602                         goto err;
 603         }
 604
 605         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 606                 iface->ra_not_onlink = blobmsg_get_bool(c);
 607
 608         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 609                 iface->ra_advrouter = blobmsg_get_bool(c);
 610
 611         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 612                 iface->ra_mininterval =  blobmsg_get_u32(c);
 613
 614         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 615                 iface->ra_maxinterval = blobmsg_get_u32(c);
 616
 617         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 618                 iface->ra_lifetime = blobmsg_get_u32(c);
 619
 620         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 621                 iface->ra_useleasetime = blobmsg_get_bool(c);
 622
 623         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 624                 const char *prio = blobmsg_get_string(c);
 625
 626                 if (!strcmp(prio, "high"))
 627                         iface->route_preference = 1;
 628                 else if (!strcmp(prio, "low"))
 629                         iface->route_preference = -1;
 630                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 631                         iface->route_preference = 0;
 632                 else
 633                         goto err;
 634         }
 635
 636         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 637                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 638                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 639
 640         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 641                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 642                 goto err;
 643
 644         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 645                 iface->learn_routes = blobmsg_get_bool(c);
 646
 647         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 648                 iface->external = blobmsg_get_bool(c);
 649
 650         return 0;
 651
 652 err:
 653         close_interface(iface);
 654         return -1;
 655 }
 656
 657 static int set_interface(struct uci_section *s)
 658 {
 659         blob_buf_init(&b, 0);
 660         uci_to_blob(&b, s, &interface_attr_list);
 661
 662         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 663 }
 664
 665 void odhcpd_reload(void)
 666 {
 667         struct uci_context *uci = uci_alloc_context();
 668
 669         while (!list_empty(&leases))
 670                 free_lease(list_first_entry(&leases, struct lease, head));
 671
 672         struct interface *master = NULL, *i, *n;
 673
 674         if (!uci)
 675                 return;
 676
 677         list_for_each_entry(i, &interfaces, head)
 678                 clean_interface(i);
 679
 680         struct uci_package *dhcp = NULL;
 681         if (!uci_load(uci, "dhcp", &dhcp)) {
 682                 struct uci_element *e;
 683                 uci_foreach_element(&dhcp->sections, e) {
 684                         struct uci_section *s = uci_to_section(e);
 685                         if (!strcmp(s->type, "host"))
 686                                 set_lease(s);
 687                         else if (!strcmp(s->type, "odhcpd"))
 688                                 set_config(s);
 689                 }
 690
 691                 uci_foreach_element(&dhcp->sections, e) {
 692                         struct uci_section *s = uci_to_section(e);
 693                         if (!strcmp(s->type, "dhcp"))
 694                                 set_interface(s);
 695                 }
 696         }
 697
 698         if (config.dhcp_statefile) {
 699                 char *path = strdup(config.dhcp_statefile);
 700
 701                 mkdir_p(dirname(path), 0755);
 702                 free(path);
 703         }
 704
 705 #ifdef WITH_UBUS
 706         ubus_apply_network();
 707 #endif
 708
 709         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 710
 711         /* Test for */
 712         list_for_each_entry(i, &interfaces, head) {
 713                 if (i->master)
 714                         continue;
 715
 716                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 717                         any_dhcpv6_slave = true;
 718
 719                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 720                         any_ra_slave = true;
 721
 722                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 723                         any_ndp_slave = true;
 724         }
 725
 726         /* Evaluate hybrid mode for master */
 727         list_for_each_entry(i, &interfaces, head) {
 728                 if (!i->master)
 729                         continue;
 730
 731                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 732 #ifdef WITH_UBUS
 733                 if (!ubus_has_prefix(i->name, i->ifname))
 734                         hybrid_mode = RELAYD_RELAY;
 735 #endif
 736
 737                 if (i->dhcpv6 == RELAYD_HYBRID)
 738                         i->dhcpv6 = hybrid_mode;
 739
 740                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 741                         i->dhcpv6 = RELAYD_DISABLED;
 742
 743                 if (i->ra == RELAYD_HYBRID)
 744                         i->ra = hybrid_mode;
 745
 746                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 747                         i->ra = RELAYD_DISABLED;
 748
 749                 if (i->ndp == RELAYD_HYBRID)
 750                         i->ndp = hybrid_mode;
 751
 752                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 753                         i->ndp = RELAYD_DISABLED;
 754
 755                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 756                         master = i;
 757         }
 758
 759
 760         list_for_each_entry_safe(i, n, &interfaces, head) {
 761                 if (i->inuse) {
 762                         /* Resolve hybrid mode */
 763                         if (i->dhcpv6 == RELAYD_HYBRID)
 764                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 765                                                 RELAYD_RELAY : RELAYD_SERVER;
 766
 767                         if (i->ra == RELAYD_HYBRID)
 768                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 769                                                 RELAYD_RELAY : RELAYD_SERVER;
 770
 771                         if (i->ndp == RELAYD_HYBRID)
 772                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 773                                                 RELAYD_RELAY : RELAYD_DISABLED;
 774
 775                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 776                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 777                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 778                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 779                 } else
 780                         close_interface(i);
 781         }
 782
 783         ndp_handle_addr6_dump();
 784         uci_unload(uci, dhcp);
 785         uci_free_context(uci);
 786 }
 787
 788 static void handle_signal(int signal)
 789 {
 790         char b[1] = {0};
 791
 792         if (signal == SIGHUP) {
 793                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 794         } else
 795                 uloop_end();
 796 }
 797
 798 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 799 {
 800         char b[512];
 801         if (read(u->fd, b, sizeof(b)) < 0) {}
 802
 803         odhcpd_reload();
 804 }
 805
 806 static struct uloop_fd reload_fd = { .cb = reload_cb };
 807
 808 void odhcpd_run(void)
 809 {
 810         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 811
 812         reload_fd.fd = reload_pipe[0];
 813         uloop_fd_add(&reload_fd, ULOOP_READ);
 814
 815         signal(SIGTERM, handle_signal);
 816         signal(SIGINT, handle_signal);
 817         signal(SIGHUP, handle_signal);
 818
 819 #ifdef WITH_UBUS
 820         while (init_ubus())
 821                 sleep(1);
 822 #endif
 823
 824         odhcpd_reload();
 825         uloop_run();
 826
 827         while (!list_empty(&interfaces))
 828                 close_interface(list_first_entry(&interfaces, struct interface, head));
 829 }
 830