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 <net/if.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <syslog.h>
  11
  12 #include <uci.h>
  13 #include <uci_blob.h>
  14 #include <libubox/utils.h>
  15 #include <libubox/avl.h>
  16 #include <libubox/avl-cmp.h>
  17 #include <libubox/list.h>
  18 #include <libubox/vlist.h>
  19
  20 #include "odhcpd.h"
  21
  22 static struct blob_buf b;
  23 static int reload_pipe[2] = { -1, -1 };
  24
  25 static int lease_cmp(const void *k1, const void *k2, void *ptr);
  26 static void lease_update(struct vlist_tree *tree, struct vlist_node *node_new,
  27                          struct vlist_node *node_old);
  28
  29 struct vlist_tree leases = VLIST_TREE_INIT(leases, lease_cmp, lease_update, true, false);
  30 AVL_TREE(interfaces, avl_strcmp, false, NULL);
  31 struct config config = {.legacy = false, .main_dhcpv4 = false,
  32                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  33                         .log_level = LOG_WARNING};
  34
  35 #define START_DEFAULT   100
  36 #define LIMIT_DEFAULT   150
  37
  38 enum {
  39         IFACE_ATTR_INTERFACE,
  40         IFACE_ATTR_IFNAME,
  41         IFACE_ATTR_NETWORKID,
  42         IFACE_ATTR_DYNAMICDHCP,
  43         IFACE_ATTR_LEASETIME,
  44         IFACE_ATTR_LIMIT,
  45         IFACE_ATTR_START,
  46         IFACE_ATTR_MASTER,
  47         IFACE_ATTR_UPSTREAM,
  48         IFACE_ATTR_RA,
  49         IFACE_ATTR_DHCPV4,
  50         IFACE_ATTR_DHCPV6,
  51         IFACE_ATTR_NDP,
  52         IFACE_ATTR_ROUTER,
  53         IFACE_ATTR_DNS,
  54         IFACE_ATTR_DOMAIN,
  55         IFACE_ATTR_FILTER_CLASS,
  56         IFACE_ATTR_DHCPV4_FORCERECONF,
  57         IFACE_ATTR_DHCPV6_RAW,
  58         IFACE_ATTR_DHCPV6_ASSIGNALL,
  59         IFACE_ATTR_DHCPV6_PD,
  60         IFACE_ATTR_DHCPV6_NA,
  61         IFACE_ATTR_RA_DEFAULT,
  62         IFACE_ATTR_RA_FLAGS,
  63         IFACE_ATTR_RA_SLAAC,
  64         IFACE_ATTR_RA_OFFLINK,
  65         IFACE_ATTR_RA_PREFERENCE,
  66         IFACE_ATTR_RA_ADVROUTER,
  67         IFACE_ATTR_RA_MININTERVAL,
  68         IFACE_ATTR_RA_MAXINTERVAL,
  69         IFACE_ATTR_RA_LIFETIME,
  70         IFACE_ATTR_RA_USELEASETIME,
  71         IFACE_ATTR_RA_REACHABLETIME,
  72         IFACE_ATTR_RA_RETRANSTIME,
  73         IFACE_ATTR_RA_HOPLIMIT,
  74         IFACE_ATTR_RA_MTU,
  75         IFACE_ATTR_RA_DNS,
  76         IFACE_ATTR_PD_MANAGER,
  77         IFACE_ATTR_PD_CER,
  78         IFACE_ATTR_NDPROXY_ROUTING,
  79         IFACE_ATTR_NDPROXY_SLAVE,
  80         IFACE_ATTR_PREFIX_FILTER,
  81         IFACE_ATTR_MAX
  82 };
  83
  84 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  85         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  94         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  96         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  99         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 100         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
 101         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 102         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 103         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 104         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 105         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 106         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 107         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 108         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 109         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 110         [IFACE_ATTR_RA_FLAGS] = { .name = "ra_flags", . type = BLOBMSG_TYPE_ARRAY },
 111         [IFACE_ATTR_RA_SLAAC] = { .name = "ra_slaac", .type = BLOBMSG_TYPE_BOOL },
 112         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 113         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 114         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 115         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 116         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 117         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 118         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 119         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 121         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 122         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 123         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 124         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 125         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 126         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 127 };
 128
 129 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 130         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 131         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 132         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 133 };
 134
 135 const struct uci_blob_param_list interface_attr_list = {
 136         .n_params = IFACE_ATTR_MAX,
 137         .params = iface_attrs,
 138         .info = iface_attr_info,
 139 };
 140
 141 enum {
 142         LEASE_ATTR_IP,
 143         LEASE_ATTR_MAC,
 144         LEASE_ATTR_DUID,
 145         LEASE_ATTR_HOSTID,
 146         LEASE_ATTR_LEASETIME,
 147         LEASE_ATTR_NAME,
 148         LEASE_ATTR_MAX
 149 };
 150
 151 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 152         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 153         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 154         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 155         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 156         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 157         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 158 };
 159
 160 const struct uci_blob_param_list lease_attr_list = {
 161         .n_params = LEASE_ATTR_MAX,
 162         .params = lease_attrs,
 163 };
 164
 165 enum {
 166         ODHCPD_ATTR_LEGACY,
 167         ODHCPD_ATTR_MAINDHCP,
 168         ODHCPD_ATTR_LEASEFILE,
 169         ODHCPD_ATTR_LEASETRIGGER,
 170         ODHCPD_ATTR_LOGLEVEL,
 171         ODHCPD_ATTR_MAX
 172 };
 173
 174 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 175         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 176         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 177         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 178         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 179         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 180 };
 181
 182 const struct uci_blob_param_list odhcpd_attr_list = {
 183         .n_params = ODHCPD_ATTR_MAX,
 184         .params = odhcpd_attrs,
 185 };
 186
 187 static const struct { const char *name; uint8_t flag; } ra_flags[] = {
 188         { .name = "managed-config", .flag = ND_RA_FLAG_MANAGED },
 189         { .name = "other-config", .flag = ND_RA_FLAG_OTHER },
 190         { .name = "home-agent", .flag = ND_RA_FLAG_HOME_AGENT },
 191         { .name = "none", . flag = 0 },
 192         { .name = NULL, },
 193 };
 194
 195 static int mkdir_p(char *dir, mode_t mask)
 196 {
 197         char *l = strrchr(dir, '/');
 198         int ret;
 199
 200         if (!l)
 201                 return 0;
 202
 203         *l = '\0';
 204
 205         if (mkdir_p(dir, mask))
 206                 return -1;
 207
 208         *l = '/';
 209
 210         ret = mkdir(dir, mask);
 211         if (ret && errno == EEXIST)
 212                 return 0;
 213
 214         if (ret)
 215                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 216
 217         return ret;
 218 }
 219
 220 static void set_interface_defaults(struct interface *iface)
 221 {
 222         iface->ignore = true;
 223         iface->dhcpv4 = MODE_DISABLED;
 224         iface->dhcpv6 = MODE_DISABLED;
 225         iface->ra = MODE_DISABLED;
 226         iface->ndp = MODE_DISABLED;
 227         iface->learn_routes = 1;
 228         iface->dhcpv4_leasetime = 43200;
 229         iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
 230         iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
 231         iface->dhcpv6_assignall = true;
 232         iface->dhcpv6_pd = true;
 233         iface->dhcpv6_na = true;
 234         iface->ra_flags = ND_RA_FLAG_OTHER;
 235         iface->ra_slaac = true;
 236         iface->ra_maxinterval = 600;
 237         iface->ra_mininterval = iface->ra_maxinterval/3;
 238         iface->ra_lifetime = -1;
 239         iface->ra_dns = true;
 240 }
 241
 242 static void clean_interface(struct interface *iface)
 243 {
 244         free(iface->dns);
 245         free(iface->search);
 246         free(iface->upstream);
 247         free(iface->dhcpv4_router);
 248         free(iface->dhcpv4_dns);
 249         free(iface->dhcpv6_raw);
 250         free(iface->filter_class);
 251         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 252         set_interface_defaults(iface);
 253 }
 254
 255 static void close_interface(struct interface *iface)
 256 {
 257         avl_delete(&interfaces, &iface->avl);
 258
 259         router_setup_interface(iface, false);
 260         dhcpv6_setup_interface(iface, false);
 261         ndp_setup_interface(iface, false);
 262 #ifdef DHCPV4_SUPPORT
 263         dhcpv4_setup_interface(iface, false);
 264 #endif
 265
 266         clean_interface(iface);
 267         free(iface->addr4);
 268         free(iface->addr6);
 269         free(iface->ifname);
 270         free(iface);
 271 }
 272
 273 static int parse_mode(const char *mode)
 274 {
 275         if (!strcmp(mode, "disabled"))
 276                 return MODE_DISABLED;
 277         else if (!strcmp(mode, "server"))
 278                 return MODE_SERVER;
 279         else if (!strcmp(mode, "relay"))
 280                 return MODE_RELAY;
 281         else if (!strcmp(mode, "hybrid"))
 282                 return MODE_HYBRID;
 283         else
 284                 return -1;
 285 }
 286
 287 static int parse_ra_flags(uint8_t *flags, struct blob_attr *attr)
 288 {
 289         struct blob_attr *cur;
 290         unsigned rem;
 291
 292         blobmsg_for_each_attr(cur, attr, rem) {
 293                 int i;
 294
 295                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 296                         continue;
 297
 298                 if (!blobmsg_check_attr(cur, false))
 299                         continue;
 300
 301                 for (i = 0; ra_flags[i].name; i++) {
 302                         if (!strcmp(ra_flags[i].name, blobmsg_get_string(cur))) {
 303                                 *flags |= ra_flags[i].flag;
 304                                 break;
 305                         }
 306                 }
 307
 308                 if (!ra_flags[i].name)
 309                         return -1;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static void set_config(struct uci_section *s)
 316 {
 317         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 318
 319         blob_buf_init(&b, 0);
 320         uci_to_blob(&b, s, &odhcpd_attr_list);
 321         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 322
 323         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 324                 config.legacy = blobmsg_get_bool(c);
 325
 326         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 327                 config.main_dhcpv4 = blobmsg_get_bool(c);
 328
 329         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 330                 free(config.dhcp_statefile);
 331                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 332         }
 333
 334         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 335                 free(config.dhcp_cb);
 336                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 337         }
 338
 339         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 340                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 341
 342                 if (config.log_level != log_level) {
 343                         config.log_level = log_level;
 344                         setlogmask(LOG_UPTO(config.log_level));
 345                 }
 346         }
 347 }
 348
 349 static double parse_leasetime(struct blob_attr *c) {
 350         char *val = blobmsg_get_string(c), *endptr = NULL;
 351         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 352
 353         if (time && endptr && endptr[0]) {
 354                 if (endptr[0] == 's')
 355                         time *= 1;
 356                 else if (endptr[0] == 'm')
 357                         time *= 60;
 358                 else if (endptr[0] == 'h')
 359                         time *= 3600;
 360                 else if (endptr[0] == 'd')
 361                         time *= 24 * 3600;
 362                 else if (endptr[0] == 'w')
 363                         time *= 7 * 24 * 3600;
 364                 else
 365                         goto err;
 366         }
 367
 368         if (time < 60)
 369                 time = 60;
 370
 371         return time;
 372
 373 err:
 374         return -1;
 375 }
 376
 377 static void free_lease(struct lease *l)
 378 {
 379         free(l->hostname);
 380         free(l);
 381 }
 382
 383 static int set_lease(struct uci_section *s)
 384 {
 385         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 386         struct lease *l;
 387         size_t duidlen = 0;
 388         uint8_t *duid;
 389
 390         blob_buf_init(&b, 0);
 391         uci_to_blob(&b, s, &lease_attr_list);
 392         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 393
 394         if ((c = tb[LEASE_ATTR_DUID]))
 395                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 396
 397         l = calloc_a(sizeof(*l), &duid, duidlen);
 398         if (!l)
 399                 goto err;
 400
 401         if ((c = tb[LEASE_ATTR_MAC]))
 402                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 403                         goto err;
 404
 405         if ((c = tb[LEASE_ATTR_DUID])) {
 406                 ssize_t len;
 407
 408                 l->duid = duid;
 409                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 410
 411                 if (len < 0)
 412                         goto err;
 413
 414                 l->duid_len = len;
 415         }
 416
 417         if ((c = tb[LEASE_ATTR_NAME])) {
 418                 l->hostname = strdup(blobmsg_get_string(c));
 419                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 420                         goto err;
 421         }
 422
 423         if ((c = tb[LEASE_ATTR_IP]))
 424                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 425                         goto err;
 426
 427         if ((c = tb[LEASE_ATTR_HOSTID])) {
 428                 errno = 0;
 429                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 430                 if (errno)
 431                         goto err;
 432         } else {
 433                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 434                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 435         }
 436
 437         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 438                 double time = parse_leasetime(c);
 439                 if (time < 0)
 440                         goto err;
 441
 442                 l->leasetime = time;
 443         }
 444
 445         INIT_LIST_HEAD(&l->assignments);
 446         vlist_add(&leases, &l->node, l);
 447         return 0;
 448
 449 err:
 450         if (l)
 451                 free_lease(l);
 452
 453         return -1;
 454 }
 455
 456 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 457 {
 458         struct interface *iface;
 459         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 460         bool get_addrs = false;
 461
 462         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 463
 464         if (tb[IFACE_ATTR_INTERFACE])
 465                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 466
 467         if (!name)
 468                 return -1;
 469
 470         iface = avl_find_element(&interfaces, name, iface, avl);
 471         if (!iface) {
 472                 char *new_name;
 473
 474                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 475                 if (!iface)
 476                         return -1;
 477
 478                 iface->name = strcpy(new_name, name);
 479                 iface->avl.key = iface->name;
 480                 iface->router_event.uloop.fd = -1;
 481                 iface->dhcpv6_event.uloop.fd = -1;
 482                 iface->ndp_event.uloop.fd = -1;
 483                 iface->ndp_ping_fd = -1;
 484                 iface->dhcpv4_event.uloop.fd = -1;
 485                 INIT_LIST_HEAD(&iface->ia_assignments);
 486                 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
 487                 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
 488
 489                 set_interface_defaults(iface);
 490
 491                 avl_insert(&interfaces, &iface->avl);
 492                 get_addrs = overwrite = true;
 493         }
 494
 495         const char *ifname = NULL;
 496         if (overwrite) {
 497                 if ((c = tb[IFACE_ATTR_IFNAME]))
 498                         ifname = blobmsg_get_string(c);
 499                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 500                         ifname = blobmsg_get_string(c);
 501         }
 502
 503 #ifdef WITH_UBUS
 504         if (overwrite || !iface->ifname)
 505                 ifname = ubus_get_ifname(name);
 506 #endif
 507
 508         if (!iface->ifname && !ifname)
 509                 goto err;
 510
 511         if (ifname) {
 512                 free(iface->ifname);
 513                 iface->ifname = strdup(ifname);
 514
 515                 if (!iface->ifname)
 516                         goto err;
 517
 518                 if (!iface->ifindex &&
 519                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 520                         goto err;
 521         }
 522
 523         if (get_addrs) {
 524                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 525                                                 true, &iface->addr6);
 526
 527                 if (len > 0)
 528                         iface->addr6_len = len;
 529
 530                 len = netlink_get_interface_addrs(iface->ifindex,
 531                                                 false, &iface->addr4);
 532                 if (len > 0)
 533                         iface->addr4_len = len;
 534         }
 535
 536         iface->inuse = true;
 537
 538         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 539                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 540
 541         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 542                 double time = parse_leasetime(c);
 543                 if (time < 0)
 544                         goto err;
 545
 546                 iface->dhcpv4_leasetime = time;
 547         }
 548
 549         if ((c = tb[IFACE_ATTR_START])) {
 550                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 551                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 552                                                         LIMIT_DEFAULT - 1);
 553
 554                 if (config.main_dhcpv4 && config.legacy)
 555                         iface->dhcpv4 = MODE_SERVER;
 556         }
 557
 558         if ((c = tb[IFACE_ATTR_LIMIT]))
 559                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 560                                                         blobmsg_get_u32(c) - 1);
 561
 562         if ((c = tb[IFACE_ATTR_MASTER]))
 563                 iface->master = blobmsg_get_bool(c);
 564
 565         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 566                 struct blob_attr *cur;
 567                 unsigned rem;
 568
 569                 blobmsg_for_each_attr(cur, c, rem) {
 570                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 571                                 continue;
 572
 573                         iface->upstream = realloc(iface->upstream,
 574                                         iface->upstream_len + blobmsg_data_len(cur));
 575                         if (!iface->upstream)
 576                                 goto err;
 577
 578                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 579                         iface->upstream_len += blobmsg_data_len(cur);
 580                 }
 581         }
 582
 583         int mode;
 584         if ((c = tb[IFACE_ATTR_RA])) {
 585                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 586                         iface->ra = mode;
 587
 588                         if (iface->ra != MODE_DISABLED)
 589                                 iface->ignore = false;
 590                 } else
 591                         goto err;
 592         }
 593
 594         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 595                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 596                         if (config.main_dhcpv4) {
 597                                 iface->dhcpv4 = mode;
 598
 599                                 if (iface->dhcpv4 != MODE_DISABLED)
 600                                         iface->ignore = false;
 601                         }
 602                 }
 603                 else
 604                         goto err;
 605         }
 606
 607         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 608                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 609                         iface->dhcpv6 = mode;
 610
 611                         if (iface->dhcpv6 != MODE_DISABLED)
 612                                 iface->ignore = false;
 613                 } else
 614                         goto err;
 615         }
 616
 617         if ((c = tb[IFACE_ATTR_NDP])) {
 618                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 619                         iface->ndp = mode;
 620
 621                         if (iface->ndp != MODE_DISABLED)
 622                                 iface->ignore = false;
 623                 } else
 624                         goto err;
 625         }
 626
 627         if ((c = tb[IFACE_ATTR_ROUTER])) {
 628                 struct blob_attr *cur;
 629                 unsigned rem;
 630
 631                 blobmsg_for_each_attr(cur, c, rem) {
 632                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 633                                 continue;
 634
 635                         struct in_addr addr4;
 636                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 637                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 638                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 639                                 if (!iface->dhcpv4_router)
 640                                         goto err;
 641
 642                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 643                         } else
 644                                 goto err;
 645                 }
 646         }
 647
 648         if ((c = tb[IFACE_ATTR_DNS])) {
 649                 struct blob_attr *cur;
 650                 unsigned rem;
 651
 652                 iface->always_rewrite_dns = true;
 653                 blobmsg_for_each_attr(cur, c, rem) {
 654                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 655                                 continue;
 656
 657                         struct in_addr addr4;
 658                         struct in6_addr addr6;
 659                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 660                                 if (addr4.s_addr == INADDR_ANY)
 661                                         goto err;
 662
 663                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 664                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 665                                 if (!iface->dhcpv4_dns)
 666                                         goto err;
 667
 668                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 669                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 670                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 671                                         goto err;
 672
 673                                 iface->dns = realloc(iface->dns,
 674                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 675                                 if (!iface->dns)
 676                                         goto err;
 677
 678                                 iface->dns[iface->dns_cnt - 1] = addr6;
 679                         } else
 680                                 goto err;
 681                 }
 682         }
 683
 684         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 685                 struct blob_attr *cur;
 686                 unsigned rem;
 687
 688                 blobmsg_for_each_attr(cur, c, rem) {
 689                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 690                                 continue;
 691
 692                         uint8_t buf[256];
 693                         char *domain = blobmsg_get_string(cur);
 694                         size_t domainlen = strlen(domain);
 695                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 696                                 domain[domainlen - 1] = 0;
 697
 698                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 699                         if (len <= 0)
 700                                 goto err;
 701
 702                         iface->search = realloc(iface->search, iface->search_len + len);
 703                         if (!iface->search)
 704                                 goto err;
 705
 706                         memcpy(&iface->search[iface->search_len], buf, len);
 707                         iface->search_len += len;
 708                 }
 709         }
 710
 711         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 712                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 713                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 714         }
 715
 716         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 717                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 718
 719         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 720                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 721                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 722                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 723         }
 724
 725         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 726                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 727
 728         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 729                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 730
 731         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 732                 iface->dhcpv6_na = blobmsg_get_bool(c);
 733
 734         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 735                 iface->default_router = blobmsg_get_u32(c);
 736
 737         if ((c = tb[IFACE_ATTR_RA_FLAGS])) {
 738                 iface->ra_flags = 0;
 739                 if (parse_ra_flags(&iface->ra_flags, c) < 0)
 740                         goto err;
 741         }
 742
 743         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 744                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 745                 if (ra_reachabletime > 3600000)
 746                         goto err;
 747
 748                 iface->ra_reachabletime = ra_reachabletime;
 749         }
 750
 751         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 752                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 753                 if (ra_retranstime > 60000)
 754                         goto err;
 755
 756                 iface->ra_retranstime = ra_retranstime;
 757         }
 758
 759         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 760                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 761                 if (ra_hoplimit > 255)
 762                         goto err;
 763
 764                 iface->ra_hoplimit = ra_hoplimit;
 765         }
 766
 767         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 768                 uint32_t ra_mtu = blobmsg_get_u32(c);
 769                 if (ra_mtu < 1280 || ra_mtu > 65535)
 770                         goto err;
 771
 772                 iface->ra_mtu = ra_mtu;
 773         }
 774
 775         if ((c = tb[IFACE_ATTR_RA_SLAAC]))
 776                 iface->ra_slaac = blobmsg_get_bool(c);
 777
 778         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 779                 iface->ra_not_onlink = blobmsg_get_bool(c);
 780
 781         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 782                 iface->ra_advrouter = blobmsg_get_bool(c);
 783
 784         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 785                 iface->ra_mininterval =  blobmsg_get_u32(c);
 786
 787         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 788                 iface->ra_maxinterval = blobmsg_get_u32(c);
 789
 790         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 791                 iface->ra_lifetime = blobmsg_get_u32(c);
 792
 793         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 794                 iface->ra_useleasetime = blobmsg_get_bool(c);
 795
 796         if ((c = tb[IFACE_ATTR_RA_DNS]))
 797                 iface->ra_dns = blobmsg_get_bool(c);
 798
 799         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 800                 const char *prio = blobmsg_get_string(c);
 801
 802                 if (!strcmp(prio, "high"))
 803                         iface->route_preference = 1;
 804                 else if (!strcmp(prio, "low"))
 805                         iface->route_preference = -1;
 806                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 807                         iface->route_preference = 0;
 808                 else
 809                         goto err;
 810         }
 811
 812         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 813                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 814                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 815
 816         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 817                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 818                 goto err;
 819
 820         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 821                 iface->learn_routes = blobmsg_get_bool(c);
 822
 823         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 824                 iface->external = blobmsg_get_bool(c);
 825
 826         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 827                 const char *str = blobmsg_get_string(c);
 828                 char *astr = malloc(strlen(str) + 1);
 829                 char *delim;
 830                 int l;
 831
 832                 if (!astr || !strcpy(astr, str) ||
 833                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 834                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 835                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 836                         iface->pio_filter_length = 0;
 837                 else
 838                         iface->pio_filter_length = l;
 839
 840                 if (astr)
 841                         free(astr);
 842         }
 843
 844         return 0;
 845
 846 err:
 847         close_interface(iface);
 848         return -1;
 849 }
 850
 851 static int set_interface(struct uci_section *s)
 852 {
 853         blob_buf_init(&b, 0);
 854         uci_to_blob(&b, s, &interface_attr_list);
 855
 856         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 857 }
 858
 859 static void lease_delete_assignments(struct lease *l, bool v6)
 860 {
 861         struct dhcp_assignment *a, *tmp;
 862         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 863
 864         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 865                 if (a->flags & flag)
 866                         free_assignment(a);
 867         }
 868 }
 869
 870 static void lease_update_assignments(struct lease *l)
 871 {
 872         struct dhcp_assignment *a;
 873
 874         list_for_each_entry(a, &l->assignments, lease_list) {
 875                 if (a->hostname)
 876                         free(a->hostname);
 877                 a->hostname = NULL;
 878
 879                 if (l->hostname)
 880                         a->hostname = strdup(l->hostname);
 881
 882                 a->leasetime = l->leasetime;
 883         }
 884 }
 885
 886 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 887 {
 888         const struct lease *l1 = k1, *l2 = k2;
 889         int cmp = 0;
 890
 891         if (l1->duid_len != l2->duid_len)
 892                 return l1->duid_len - l2->duid_len;
 893
 894         if (l1->duid_len && l2->duid_len)
 895                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 896
 897         if (cmp)
 898                 return cmp;
 899
 900         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 901                       sizeof(l1->mac.ether_addr_octet));
 902 }
 903
 904 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 905 {
 906         bool update = false;
 907
 908         if ((!!l_new->hostname != !!l_old->hostname) ||
 909             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 910                 free(l_old->hostname);
 911                 l_old->hostname = NULL;
 912
 913                 if (l_new->hostname)
 914                         l_old->hostname = strdup(l_new->hostname);
 915
 916                 update = true;
 917         }
 918
 919         if (l_old->leasetime != l_new->leasetime) {
 920                 l_old->leasetime = l_new->leasetime;
 921                 update = true;
 922         }
 923
 924         if (l_old->ipaddr != l_new->ipaddr) {
 925                 l_old->ipaddr = l_new->ipaddr;
 926                 lease_delete_assignments(l_old, false);
 927         }
 928
 929         if (l_old->hostid != l_new->hostid) {
 930                 l_old->hostid = l_new->hostid;
 931                 lease_delete_assignments(l_old, true);
 932         }
 933
 934         if (update)
 935                 lease_update_assignments(l_old);
 936
 937         free_lease(l_new);
 938 }
 939
 940 static void lease_delete(struct lease *l)
 941 {
 942         struct dhcp_assignment *a, *tmp;
 943
 944         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
 945                 free_assignment(a);
 946
 947         free_lease(l);
 948 }
 949
 950 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 951                          struct vlist_node *node_old)
 952 {
 953         struct lease *lease_new = container_of(node_new, struct lease, node);
 954         struct lease *lease_old = container_of(node_old, struct lease, node);
 955
 956         if (node_old && node_new)
 957                 lease_change_config(lease_old, lease_new);
 958         else if (node_old)
 959                 lease_delete(lease_old);
 960 }
 961
 962 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 963 {
 964         struct lease *l;
 965
 966         vlist_for_each_element(&leases, l, node) {
 967                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 968                         return l;
 969         }
 970
 971         return NULL;
 972 }
 973
 974 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 975 {
 976         struct lease *l;
 977
 978         vlist_for_each_element(&leases, l, node) {
 979                 if (!memcmp(l->mac.ether_addr_octet, mac,
 980                             sizeof(l->mac.ether_addr_octet)))
 981                         return l;
 982         }
 983
 984         return NULL;
 985 }
 986
 987 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
 988 {
 989         struct lease *l;
 990
 991         vlist_for_each_element(&leases, l, node) {
 992                 if (l->hostid == hostid)
 993                         return l;
 994         }
 995
 996         return NULL;
 997 }
 998
 999 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
1000 {
1001         struct lease *l;
1002
1003         vlist_for_each_element(&leases, l, node) {
1004                 if (l->ipaddr == ipaddr)
1005                         return l;
1006         }
1007
1008         return NULL;
1009 }
1010
1011 void odhcpd_reload(void)
1012 {
1013         struct uci_context *uci = uci_alloc_context();
1014         struct interface *master = NULL, *i, *tmp;
1015
1016         if (!uci)
1017                 return;
1018
1019         vlist_update(&leases);
1020         avl_for_each_element(&interfaces, i, avl)
1021                 clean_interface(i);
1022
1023         struct uci_package *dhcp = NULL;
1024         if (!uci_load(uci, "dhcp", &dhcp)) {
1025                 struct uci_element *e;
1026
1027                 /* 1. Global settings */
1028                 uci_foreach_element(&dhcp->sections, e) {
1029                         struct uci_section *s = uci_to_section(e);
1030                         if (!strcmp(s->type, "odhcpd"))
1031                                 set_config(s);
1032                 }
1033
1034                 /* 2. DHCP pools */
1035                 uci_foreach_element(&dhcp->sections, e) {
1036                         struct uci_section *s = uci_to_section(e);
1037                         if (!strcmp(s->type, "dhcp"))
1038                                 set_interface(s);
1039                 }
1040
1041                 /* 3. Static leases */
1042                 uci_foreach_element(&dhcp->sections, e) {
1043                         struct uci_section* s = uci_to_section(e);
1044                         if (!strcmp(s->type, "host"))
1045                                 set_lease(s);
1046                 }
1047         }
1048
1049         if (config.dhcp_statefile) {
1050                 char *path = strdup(config.dhcp_statefile);
1051
1052                 mkdir_p(dirname(path), 0755);
1053                 free(path);
1054         }
1055
1056         vlist_flush(&leases);
1057
1058 #ifdef WITH_UBUS
1059         ubus_apply_network();
1060 #endif
1061
1062         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1063
1064         /* Test for */
1065         avl_for_each_element(&interfaces, i, avl) {
1066                 if (i->master)
1067                         continue;
1068
1069                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1070                         any_dhcpv6_slave = true;
1071
1072                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1073                         any_ra_slave = true;
1074
1075                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1076                         any_ndp_slave = true;
1077         }
1078
1079         /* Evaluate hybrid mode for master */
1080         avl_for_each_element(&interfaces, i, avl) {
1081                 if (!i->master)
1082                         continue;
1083
1084                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1085 #ifdef WITH_UBUS
1086                 if (!ubus_has_prefix(i->name, i->ifname))
1087                         hybrid_mode = MODE_RELAY;
1088 #endif
1089
1090                 if (i->dhcpv6 == MODE_HYBRID)
1091                         i->dhcpv6 = hybrid_mode;
1092
1093                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1094                         i->dhcpv6 = MODE_DISABLED;
1095
1096                 if (i->ra == MODE_HYBRID)
1097                         i->ra = hybrid_mode;
1098
1099                 if (i->ra == MODE_RELAY && !any_ra_slave)
1100                         i->ra = MODE_DISABLED;
1101
1102                 if (i->ndp == MODE_HYBRID)
1103                         i->ndp = hybrid_mode;
1104
1105                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1106                         i->ndp = MODE_DISABLED;
1107
1108                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1109                         master = i;
1110         }
1111
1112
1113         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1114                 if (i->inuse) {
1115                         /* Resolve hybrid mode */
1116                         if (i->dhcpv6 == MODE_HYBRID)
1117                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1118                                                 MODE_RELAY : MODE_SERVER;
1119
1120                         if (i->ra == MODE_HYBRID)
1121                                 i->ra = (master && master->ra == MODE_RELAY) ?
1122                                                 MODE_RELAY : MODE_SERVER;
1123
1124                         if (i->ndp == MODE_HYBRID)
1125                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1126                                                 MODE_RELAY : MODE_DISABLED;
1127
1128                         router_setup_interface(i, i->ra != MODE_DISABLED);
1129                         dhcpv6_setup_interface(i, i->dhcpv6 != MODE_DISABLED);
1130                         ndp_setup_interface(i, i->ndp != MODE_DISABLED);
1131 #ifdef DHCPV4_SUPPORT
1132                         dhcpv4_setup_interface(i, i->dhcpv4 != MODE_DISABLED);
1133 #endif
1134                 } else
1135                         close_interface(i);
1136         }
1137
1138         uci_unload(uci, dhcp);
1139         uci_free_context(uci);
1140 }
1141
1142 static void handle_signal(int signal)
1143 {
1144         char b[1] = {0};
1145
1146         if (signal == SIGHUP) {
1147                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1148         } else
1149                 uloop_end();
1150 }
1151
1152 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1153 {
1154         char b[512];
1155         if (read(u->fd, b, sizeof(b)) < 0) {}
1156
1157         odhcpd_reload();
1158 }
1159
1160 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1161
1162 void odhcpd_run(void)
1163 {
1164         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1165
1166         reload_fd.fd = reload_pipe[0];
1167         uloop_fd_add(&reload_fd, ULOOP_READ);
1168
1169         signal(SIGTERM, handle_signal);
1170         signal(SIGINT, handle_signal);
1171         signal(SIGHUP, handle_signal);
1172
1173 #ifdef WITH_UBUS
1174         while (ubus_init())
1175                 sleep(1);
1176 #endif
1177
1178         odhcpd_reload();
1179         uloop_run();
1180 }