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_REACHABLETIME,
  54         IFACE_ATTR_RA_RETRANSTIME,
  55         IFACE_ATTR_RA_HOPLIMIT,
  56         IFACE_ATTR_RA_MTU,
  57         IFACE_ATTR_PD_MANAGER,
  58         IFACE_ATTR_PD_CER,
  59         IFACE_ATTR_NDPROXY_ROUTING,
  60         IFACE_ATTR_NDPROXY_SLAVE,
  61         IFACE_ATTR_MAX
  62 };
  63
  64 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  65         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  69         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  72         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  73         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  74         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  75         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  80         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  81         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  82         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  87         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  88         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  93         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  95         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
  97         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
  98         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
  99         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 100         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 101 };
 102
 103 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 104         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 105         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 106         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 107 };
 108
 109 const struct uci_blob_param_list interface_attr_list = {
 110         .n_params = IFACE_ATTR_MAX,
 111         .params = iface_attrs,
 112         .info = iface_attr_info,
 113 };
 114
 115 enum {
 116         LEASE_ATTR_IP,
 117         LEASE_ATTR_MAC,
 118         LEASE_ATTR_DUID,
 119         LEASE_ATTR_HOSTID,
 120         LEASE_ATTR_LEASETIME,
 121         LEASE_ATTR_NAME,
 122         LEASE_ATTR_MAX
 123 };
 124
 125 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 126         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 127         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 128         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 129         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 130         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 131         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 132 };
 133
 134 const struct uci_blob_param_list lease_attr_list = {
 135         .n_params = LEASE_ATTR_MAX,
 136         .params = lease_attrs,
 137 };
 138
 139 enum {
 140         ODHCPD_ATTR_LEGACY,
 141         ODHCPD_ATTR_MAINDHCP,
 142         ODHCPD_ATTR_LEASEFILE,
 143         ODHCPD_ATTR_LEASETRIGGER,
 144         ODHCPD_ATTR_LOGLEVEL,
 145         ODHCPD_ATTR_MAX
 146 };
 147
 148 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 149         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 150         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 151         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 152         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 153         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 154 };
 155
 156 const struct uci_blob_param_list odhcpd_attr_list = {
 157         .n_params = ODHCPD_ATTR_MAX,
 158         .params = odhcpd_attrs,
 159 };
 160
 161 static int mkdir_p(char *dir, mode_t mask)
 162 {
 163         char *l = strrchr(dir, '/');
 164         int ret;
 165
 166         if (!l)
 167                 return 0;
 168
 169         *l = '\0';
 170
 171         if (mkdir_p(dir, mask))
 172                 return -1;
 173
 174         *l = '/';
 175
 176         ret = mkdir(dir, mask);
 177         if (ret && errno == EEXIST)
 178                 return 0;
 179
 180         if (ret)
 181                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 182
 183         return ret;
 184 }
 185
 186 static void free_lease(struct lease *l)
 187 {
 188         if (l->head.next)
 189                 list_del(&l->head);
 190
 191         free(l->duid);
 192         free(l);
 193 }
 194
 195 static struct interface* get_interface(const char *name)
 196 {
 197         struct interface *c;
 198         list_for_each_entry(c, &interfaces, head)
 199                 if (!strcmp(c->name, name))
 200                         return c;
 201         return NULL;
 202 }
 203
 204 static void set_interface_defaults(struct interface *iface)
 205 {
 206         iface->managed = 1;
 207         iface->learn_routes = 1;
 208         iface->dhcpv4_leasetime = 43200;
 209         iface->ra_maxinterval = 600;
 210         iface->ra_mininterval = iface->ra_maxinterval/3;
 211         iface->ra_lifetime = -1;
 212 }
 213
 214 static void clean_interface(struct interface *iface)
 215 {
 216         free(iface->dns);
 217         free(iface->search);
 218         free(iface->upstream);
 219         free(iface->dhcpv4_router);
 220         free(iface->dhcpv4_dns);
 221         free(iface->dhcpv6_raw);
 222         free(iface->filter_class);
 223         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 224         set_interface_defaults(iface);
 225 }
 226
 227 static void close_interface(struct interface *iface)
 228 {
 229         if (iface->head.next)
 230                 list_del(&iface->head);
 231
 232         setup_router_interface(iface, false);
 233         setup_dhcpv6_interface(iface, false);
 234         setup_ndp_interface(iface, false);
 235         setup_dhcpv4_interface(iface, false);
 236
 237         clean_interface(iface);
 238         free(iface);
 239 }
 240
 241 static int parse_mode(const char *mode)
 242 {
 243         if (!strcmp(mode, "disabled"))
 244                 return RELAYD_DISABLED;
 245         else if (!strcmp(mode, "server"))
 246                 return RELAYD_SERVER;
 247         else if (!strcmp(mode, "relay"))
 248                 return RELAYD_RELAY;
 249         else if (!strcmp(mode, "hybrid"))
 250                 return RELAYD_HYBRID;
 251         else
 252                 return -1;
 253 }
 254
 255 static void set_config(struct uci_section *s)
 256 {
 257         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 258
 259         blob_buf_init(&b, 0);
 260         uci_to_blob(&b, s, &odhcpd_attr_list);
 261         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 262
 263         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 264                 config.legacy = blobmsg_get_bool(c);
 265
 266         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 267                 config.main_dhcpv4 = blobmsg_get_bool(c);
 268
 269         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 270                 free(config.dhcp_statefile);
 271                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 272         }
 273
 274         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 275                 free(config.dhcp_cb);
 276                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 277         }
 278
 279         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 280                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 281
 282                 if (config.log_level != log_level) {
 283                         config.log_level = log_level;
 284                         setlogmask(LOG_UPTO(config.log_level));
 285                 }
 286         }
 287 }
 288
 289 static double parse_leasetime(struct blob_attr *c) {
 290         char *val = blobmsg_get_string(c), *endptr = NULL;
 291         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 292
 293         if (time && endptr && endptr[0]) {
 294                 if (endptr[0] == 's')
 295                         time *= 1;
 296                 else if (endptr[0] == 'm')
 297                         time *= 60;
 298                 else if (endptr[0] == 'h')
 299                         time *= 3600;
 300                 else if (endptr[0] == 'd')
 301                         time *= 24 * 3600;
 302                 else if (endptr[0] == 'w')
 303                         time *= 7 * 24 * 3600;
 304                 else
 305                         goto err;
 306         }
 307
 308         if (time < 60)
 309                 time = 60;
 310
 311         return time;
 312
 313 err:
 314         return -1;
 315 }
 316
 317 static int set_lease(struct uci_section *s)
 318 {
 319         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 320
 321         blob_buf_init(&b, 0);
 322         uci_to_blob(&b, s, &lease_attr_list);
 323         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 324
 325         size_t hostlen = 1;
 326         if ((c = tb[LEASE_ATTR_NAME]))
 327                 hostlen = blobmsg_data_len(c);
 328
 329         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 330         if (!lease)
 331                 goto err;
 332
 333         if (hostlen > 1)
 334                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 335
 336         if ((c = tb[LEASE_ATTR_IP]))
 337                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 338                         goto err;
 339
 340         if ((c = tb[LEASE_ATTR_MAC]))
 341                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 342                         goto err;
 343
 344         if ((c = tb[LEASE_ATTR_DUID])) {
 345                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 346                 lease->duid = malloc(duidlen);
 347                 if (!lease->duid)
 348                         goto err;
 349
 350                 ssize_t len = odhcpd_unhexlify(lease->duid,
 351                                 duidlen, blobmsg_get_string(c));
 352
 353                 if (len < 0)
 354                         goto err;
 355
 356                 lease->duid_len = len;
 357         }
 358
 359         if ((c = tb[LEASE_ATTR_HOSTID])) {
 360                 errno = 0;
 361                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 362                 if (errno)
 363                         goto err;
 364         }
 365
 366         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 367                 double time = parse_leasetime(c);
 368                 if (time < 0)
 369                         goto err;
 370
 371                 lease->dhcpv4_leasetime = time;
 372         }
 373
 374         list_add(&lease->head, &leases);
 375         return 0;
 376
 377 err:
 378         if (lease)
 379                 free_lease(lease);
 380
 381         return -1;
 382 }
 383
 384 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 385 {
 386         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 387         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 388
 389         if (tb[IFACE_ATTR_INTERFACE])
 390                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 391
 392         if (!name)
 393                 return -1;
 394
 395         struct interface *iface = get_interface(name);
 396         if (!iface) {
 397                 iface = calloc(1, sizeof(*iface));
 398                 if (!iface)
 399                         return -1;
 400
 401                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 402
 403                 set_interface_defaults(iface);
 404
 405                 list_add(&iface->head, &interfaces);
 406                 overwrite = true;
 407         }
 408
 409         const char *ifname = NULL;
 410         if (overwrite) {
 411                 if ((c = tb[IFACE_ATTR_IFNAME]))
 412                         ifname = blobmsg_get_string(c);
 413                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 414                         ifname = blobmsg_get_string(c);
 415         }
 416
 417 #ifdef WITH_UBUS
 418         if (overwrite || !iface->ifname[0])
 419                 ifname = ubus_get_ifname(name);
 420 #endif
 421
 422         if (!iface->ifname[0] && !ifname)
 423                 goto err;
 424
 425         if (ifname)
 426                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 427
 428         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 429                 goto err;
 430
 431         iface->inuse = true;
 432
 433         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 434                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 435
 436         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 437                 iface->ignore = blobmsg_get_bool(c);
 438
 439         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 440                 double time = parse_leasetime(c);
 441                 if (time < 0)
 442                         goto err;
 443
 444                 iface->dhcpv4_leasetime = time;
 445         }
 446
 447         if ((c = tb[IFACE_ATTR_START])) {
 448                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 449
 450                 if (config.main_dhcpv4 && config.legacy)
 451                         iface->dhcpv4 = RELAYD_SERVER;
 452         }
 453
 454         if ((c = tb[IFACE_ATTR_LIMIT]))
 455                 iface->dhcpv4_end.s_addr = htonl(
 456                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 457
 458         if ((c = tb[IFACE_ATTR_MASTER]))
 459                 iface->master = blobmsg_get_bool(c);
 460
 461         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 462                 struct blob_attr *cur;
 463                 unsigned rem;
 464
 465                 blobmsg_for_each_attr(cur, c, rem) {
 466                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 467                                 continue;
 468
 469                         iface->upstream = realloc(iface->upstream,
 470                                         iface->upstream_len + blobmsg_data_len(cur));
 471                         if (!iface->upstream)
 472                                 goto err;
 473
 474                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 475                         iface->upstream_len += blobmsg_data_len(cur);
 476                 }
 477         }
 478
 479         int mode;
 480         if ((c = tb[IFACE_ATTR_RA])) {
 481                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 482                         iface->ra = mode;
 483                 else
 484                         goto err;
 485         }
 486
 487         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 488                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 489                         if (config.main_dhcpv4)
 490                                 iface->dhcpv4 = mode;
 491                 }
 492                 else
 493                         goto err;
 494         }
 495
 496         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 497                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 498                         iface->dhcpv6 = mode;
 499                 else
 500                         goto err;
 501         }
 502
 503         if ((c = tb[IFACE_ATTR_NDP])) {
 504                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 505                         iface->ndp = mode;
 506                 else
 507                         goto err;
 508         }
 509
 510         if ((c = tb[IFACE_ATTR_ROUTER])) {
 511                 struct blob_attr *cur;
 512                 unsigned rem;
 513
 514                 blobmsg_for_each_attr(cur, c, rem) {
 515                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 516                                 continue;
 517
 518                         struct in_addr addr4;
 519                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 520                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 521                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 522                                 if (!iface->dhcpv4_router)
 523                                         goto err;
 524
 525                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 526                         } else
 527                                 goto err;
 528                 }
 529         }
 530
 531         if ((c = tb[IFACE_ATTR_DNS])) {
 532                 struct blob_attr *cur;
 533                 unsigned rem;
 534
 535                 iface->always_rewrite_dns = true;
 536                 blobmsg_for_each_attr(cur, c, rem) {
 537                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 538                                 continue;
 539
 540                         struct in_addr addr4;
 541                         struct in6_addr addr6;
 542                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 543                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 544                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 545                                 if (!iface->dhcpv4_dns)
 546                                         goto err;
 547
 548                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 549                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 550                                 iface->dns = realloc(iface->dns,
 551                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 552                                 if (!iface->dns)
 553                                         goto err;
 554
 555                                 iface->dns[iface->dns_cnt - 1] = addr6;
 556                         } else
 557                                 goto err;
 558                 }
 559         }
 560
 561         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 562                 struct blob_attr *cur;
 563                 unsigned rem;
 564
 565                 blobmsg_for_each_attr(cur, c, rem) {
 566                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 567                                 continue;
 568
 569                         uint8_t buf[256];
 570                         char *domain = blobmsg_get_string(cur);
 571                         size_t domainlen = strlen(domain);
 572                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 573                                 domain[domainlen - 1] = 0;
 574
 575                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 576                         if (len <= 0)
 577                                 goto err;
 578
 579                         iface->search = realloc(iface->search, iface->search_len + len);
 580                         if (!iface->search)
 581                                 goto err;
 582
 583                         memcpy(&iface->search[iface->search_len], buf, len);
 584                         iface->search_len += len;
 585                 }
 586         }
 587
 588         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 589                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 590                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 591         }
 592
 593         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 594                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 595                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 596                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 597         }
 598
 599         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 600                 iface->default_router = blobmsg_get_u32(c);
 601
 602         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 603                 iface->managed = blobmsg_get_u32(c);
 604
 605         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 606                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 607                 if (ra_reachabletime > 3600000)
 608                         goto err;
 609
 610                 iface->ra_reachabletime = ra_reachabletime;
 611         }
 612
 613         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 614                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 615                 if (ra_retranstime > 60000)
 616                         goto err;
 617
 618                 iface->ra_retranstime = ra_retranstime;
 619         }
 620
 621         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 622                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 623                 if (ra_hoplimit > 255)
 624                         goto err;
 625
 626                 iface->ra_hoplimit = ra_hoplimit;
 627         }
 628
 629         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 630                 uint32_t ra_mtu = blobmsg_get_u32(c);
 631                 if (ra_mtu < 1280 || ra_mtu > 65535)
 632                         goto err;
 633
 634                 iface->ra_mtu = ra_mtu;
 635         }
 636
 637         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 638                 iface->ra_not_onlink = blobmsg_get_bool(c);
 639
 640         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 641                 iface->ra_advrouter = blobmsg_get_bool(c);
 642
 643         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 644                 iface->ra_mininterval =  blobmsg_get_u32(c);
 645
 646         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 647                 iface->ra_maxinterval = blobmsg_get_u32(c);
 648
 649         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 650                 iface->ra_lifetime = blobmsg_get_u32(c);
 651
 652         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 653                 iface->ra_useleasetime = blobmsg_get_bool(c);
 654
 655         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 656                 const char *prio = blobmsg_get_string(c);
 657
 658                 if (!strcmp(prio, "high"))
 659                         iface->route_preference = 1;
 660                 else if (!strcmp(prio, "low"))
 661                         iface->route_preference = -1;
 662                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 663                         iface->route_preference = 0;
 664                 else
 665                         goto err;
 666         }
 667
 668         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 669                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 670                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 671
 672         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 673                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 674                 goto err;
 675
 676         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 677                 iface->learn_routes = blobmsg_get_bool(c);
 678
 679         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 680                 iface->external = blobmsg_get_bool(c);
 681
 682         return 0;
 683
 684 err:
 685         close_interface(iface);
 686         return -1;
 687 }
 688
 689 static int set_interface(struct uci_section *s)
 690 {
 691         blob_buf_init(&b, 0);
 692         uci_to_blob(&b, s, &interface_attr_list);
 693
 694         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 695 }
 696
 697 void odhcpd_reload(void)
 698 {
 699         struct uci_context *uci = uci_alloc_context();
 700
 701         while (!list_empty(&leases))
 702                 free_lease(list_first_entry(&leases, struct lease, head));
 703
 704         struct interface *master = NULL, *i, *n;
 705
 706         if (!uci)
 707                 return;
 708
 709         list_for_each_entry(i, &interfaces, head)
 710                 clean_interface(i);
 711
 712         struct uci_package *dhcp = NULL;
 713         if (!uci_load(uci, "dhcp", &dhcp)) {
 714                 struct uci_element *e;
 715                 uci_foreach_element(&dhcp->sections, e) {
 716                         struct uci_section *s = uci_to_section(e);
 717                         if (!strcmp(s->type, "host"))
 718                                 set_lease(s);
 719                         else if (!strcmp(s->type, "odhcpd"))
 720                                 set_config(s);
 721                 }
 722
 723                 uci_foreach_element(&dhcp->sections, e) {
 724                         struct uci_section *s = uci_to_section(e);
 725                         if (!strcmp(s->type, "dhcp"))
 726                                 set_interface(s);
 727                 }
 728         }
 729
 730         if (config.dhcp_statefile) {
 731                 char *path = strdup(config.dhcp_statefile);
 732
 733                 mkdir_p(dirname(path), 0755);
 734                 free(path);
 735         }
 736
 737 #ifdef WITH_UBUS
 738         ubus_apply_network();
 739 #endif
 740
 741         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 742
 743         /* Test for */
 744         list_for_each_entry(i, &interfaces, head) {
 745                 if (i->master)
 746                         continue;
 747
 748                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 749                         any_dhcpv6_slave = true;
 750
 751                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 752                         any_ra_slave = true;
 753
 754                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 755                         any_ndp_slave = true;
 756         }
 757
 758         /* Evaluate hybrid mode for master */
 759         list_for_each_entry(i, &interfaces, head) {
 760                 if (!i->master)
 761                         continue;
 762
 763                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 764 #ifdef WITH_UBUS
 765                 if (!ubus_has_prefix(i->name, i->ifname))
 766                         hybrid_mode = RELAYD_RELAY;
 767 #endif
 768
 769                 if (i->dhcpv6 == RELAYD_HYBRID)
 770                         i->dhcpv6 = hybrid_mode;
 771
 772                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 773                         i->dhcpv6 = RELAYD_DISABLED;
 774
 775                 if (i->ra == RELAYD_HYBRID)
 776                         i->ra = hybrid_mode;
 777
 778                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 779                         i->ra = RELAYD_DISABLED;
 780
 781                 if (i->ndp == RELAYD_HYBRID)
 782                         i->ndp = hybrid_mode;
 783
 784                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 785                         i->ndp = RELAYD_DISABLED;
 786
 787                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 788                         master = i;
 789         }
 790
 791
 792         list_for_each_entry_safe(i, n, &interfaces, head) {
 793                 if (i->inuse) {
 794                         /* Resolve hybrid mode */
 795                         if (i->dhcpv6 == RELAYD_HYBRID)
 796                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 797                                                 RELAYD_RELAY : RELAYD_SERVER;
 798
 799                         if (i->ra == RELAYD_HYBRID)
 800                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 801                                                 RELAYD_RELAY : RELAYD_SERVER;
 802
 803                         if (i->ndp == RELAYD_HYBRID)
 804                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 805                                                 RELAYD_RELAY : RELAYD_DISABLED;
 806
 807                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 808                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 809                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 810                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 811                 } else
 812                         close_interface(i);
 813         }
 814
 815         ndp_handle_addr6_dump();
 816         uci_unload(uci, dhcp);
 817         uci_free_context(uci);
 818 }
 819
 820 static void handle_signal(int signal)
 821 {
 822         char b[1] = {0};
 823
 824         if (signal == SIGHUP) {
 825                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 826         } else
 827                 uloop_end();
 828 }
 829
 830 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 831 {
 832         char b[512];
 833         if (read(u->fd, b, sizeof(b)) < 0) {}
 834
 835         odhcpd_reload();
 836 }
 837
 838 static struct uloop_fd reload_fd = { .cb = reload_cb };
 839
 840 void odhcpd_run(void)
 841 {
 842         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 843
 844         reload_fd.fd = reload_pipe[0];
 845         uloop_fd_add(&reload_fd, ULOOP_READ);
 846
 847         signal(SIGTERM, handle_signal);
 848         signal(SIGINT, handle_signal);
 849         signal(SIGHUP, handle_signal);
 850
 851 #ifdef WITH_UBUS
 852         while (init_ubus())
 853                 sleep(1);
 854 #endif
 855
 856         odhcpd_reload();
 857         uloop_run();
 858
 859         while (!list_empty(&interfaces))
 860                 close_interface(list_first_entry(&interfaces, struct interface, head));
 861 }
 862