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
   7 #include <uci.h>
   8 #include <uci_blob.h>
   9
  10 #include "odhcpd.h"
  11
  12 static struct blob_buf b;
  13 static int reload_pipe[2];
  14 struct list_head leases = LIST_HEAD_INIT(leases);
  15 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  16 struct config config = {false, NULL, NULL};
  17
  18 enum {
  19         IFACE_ATTR_INTERFACE,
  20         IFACE_ATTR_IFNAME,
  21         IFACE_ATTR_NETWORKID,
  22         IFACE_ATTR_DYNAMICDHCP,
  23         IFACE_ATTR_IGNORE,
  24         IFACE_ATTR_LEASETIME,
  25         IFACE_ATTR_LIMIT,
  26         IFACE_ATTR_START,
  27         IFACE_ATTR_MASTER,
  28         IFACE_ATTR_UPSTREAM,
  29         IFACE_ATTR_RA,
  30         IFACE_ATTR_DHCPV4,
  31         IFACE_ATTR_DHCPV6,
  32         IFACE_ATTR_NDP,
  33         IFACE_ATTR_DNS,
  34         IFACE_ATTR_DOMAIN,
  35         IFACE_ATTR_ULA_COMPAT,
  36         IFACE_ATTR_RA_DEFAULT,
  37         IFACE_ATTR_RA_MANAGEMENT,
  38         IFACE_ATTR_RA_OFFLINK,
  39         IFACE_ATTR_RA_PREFERENCE,
  40         IFACE_ATTR_NDPROXY_ROUTING,
  41         IFACE_ATTR_NDPROXY_SLAVE,
  42         IFACE_ATTR_NDPROXY_STATIC,
  43         IFACE_ATTR_MAX
  44 };
  45
  46 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  47         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  48         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  49         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  50         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  51         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  52         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  54         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  55         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  57         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  62         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  63         [IFACE_ATTR_ULA_COMPAT] = { .name = "ula_compat", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  65         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  66         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  69         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_NDPROXY_STATIC] = { .name = "ndproxy_static", .type = BLOBMSG_TYPE_ARRAY },
  71 };
  72
  73 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  74         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_NDPROXY_STATIC] = { .type = BLOBMSG_TYPE_STRING },
  78 };
  79
  80 const struct uci_blob_param_list interface_attr_list = {
  81         .n_params = IFACE_ATTR_MAX,
  82         .params = iface_attrs,
  83         .info = iface_attr_info,
  84 };
  85
  86
  87 enum {
  88         LEASE_ATTR_IP,
  89         LEASE_ATTR_MAC,
  90         LEASE_ATTR_DUID,
  91         LEASE_ATTR_HOSTID,
  92         LEASE_ATTR_HOSTNAME,
  93         LEASE_ATTR_MAX
  94 };
  95
  96
  97 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
  98         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
  99         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 100         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 101         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 102         [LEASE_ATTR_HOSTNAME] = { .name = "hostname", .type = BLOBMSG_TYPE_STRING },
 103 };
 104
 105
 106 const struct uci_blob_param_list lease_attr_list = {
 107         .n_params = LEASE_ATTR_MAX,
 108         .params = lease_attrs,
 109 };
 110
 111
 112 enum {
 113         ODHCPD_ATTR_LEGACY,
 114         ODHCPD_ATTR_LEASEFILE,
 115         ODHCPD_ATTR_LEASETRIGGER,
 116         ODHCPD_ATTR_MAX
 117 };
 118
 119
 120 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 121         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 122         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 123         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 124 };
 125
 126
 127 const struct uci_blob_param_list odhcpd_attr_list = {
 128         .n_params = ODHCPD_ATTR_MAX,
 129         .params = odhcpd_attrs,
 130 };
 131
 132
 133 static struct interface* get_interface(const char *name)
 134 {
 135         struct interface *c;
 136         list_for_each_entry(c, &interfaces, head)
 137                 if (!strcmp(c->name, name))
 138                         return c;
 139         return NULL;
 140 }
 141
 142
 143 static void clean_interface(struct interface *iface)
 144 {
 145         free(iface->dns);
 146         free(iface->search);
 147         free(iface->upstream);
 148         free(iface->static_ndp);
 149         free(iface->dhcpv4_dns);
 150         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 151 }
 152
 153
 154 static void close_interface(struct interface *iface)
 155 {
 156         if (iface->head.next)
 157                 list_del(&iface->head);
 158
 159         setup_router_interface(iface, false);
 160         setup_dhcpv6_interface(iface, false);
 161         setup_ndp_interface(iface, false);
 162         setup_dhcpv4_interface(iface, false);
 163
 164         clean_interface(iface);
 165         free(iface);
 166 }
 167
 168
 169 static int parse_mode(const char *mode)
 170 {
 171         if (!strcmp(mode, "disabled")) {
 172                 return RELAYD_DISABLED;
 173         } else if (!strcmp(mode, "server")) {
 174                 return RELAYD_SERVER;
 175         } else if (!strcmp(mode, "relay")) {
 176                 return RELAYD_RELAY;
 177         } else if (!strcmp(mode, "hybrid")) {
 178                 return RELAYD_HYBRID;
 179         } else {
 180                 return -1;
 181         }
 182 }
 183
 184
 185 static void set_config(struct uci_section *s)
 186 {
 187         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 188
 189         blob_buf_init(&b, 0);
 190         uci_to_blob(&b, s, &lease_attr_list);
 191         blobmsg_parse(lease_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 192
 193         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 194                 config.legacy = blobmsg_get_bool(c);
 195
 196         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 197                 free(config.dhcp_statefile);
 198                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 199         }
 200
 201         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 202                 free(config.dhcp_cb);
 203                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 204         }
 205 }
 206
 207
 208 static int set_lease(struct uci_section *s)
 209 {
 210         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 211
 212         blob_buf_init(&b, 0);
 213         uci_to_blob(&b, s, &lease_attr_list);
 214         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 215
 216         size_t hostlen = 1;
 217         if ((c = tb[LEASE_ATTR_HOSTNAME]))
 218                 hostlen = blobmsg_data_len(c);
 219
 220         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 221
 222         if (hostlen > 1)
 223                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 224
 225         if ((c = tb[LEASE_ATTR_IP]))
 226                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 227                         goto err;
 228
 229         if ((c = tb[LEASE_ATTR_MAC]))
 230                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 231                         goto err;
 232
 233         if ((c = tb[LEASE_ATTR_DUID])) {
 234                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 235                 lease->duid = malloc(duidlen);
 236                 ssize_t len = odhcpd_unhexlify(lease->duid,
 237                                 duidlen, blobmsg_get_string(c));
 238
 239                 if (len < 0)
 240                         goto err;
 241
 242                 lease->duid_len = len;
 243         }
 244
 245         if ((c = tb[LEASE_ATTR_HOSTID]))
 246                 if (odhcpd_unhexlify((uint8_t*)&lease->hostid, sizeof(lease->hostid),
 247                                 blobmsg_get_string(c)) < 0)
 248                         goto err;
 249
 250         list_add(&lease->head, &leases);
 251         return 0;
 252
 253 err:
 254         free(lease->duid);
 255         free(lease);
 256         return -1;
 257 }
 258
 259
 260 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 261 {
 262         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 263         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 264
 265         if (tb[IFACE_ATTR_INTERFACE])
 266                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 267
 268         if (!name)
 269                 return -1;
 270
 271         struct interface *iface = get_interface(name);
 272         if (!iface) {
 273                 iface = calloc(1, sizeof(*iface));
 274                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 275                 list_add(&iface->head, &interfaces);
 276         } else if (overwrite) {
 277                 clean_interface(iface);
 278         }
 279
 280         const char *ifname = NULL;
 281 #ifdef WITH_UBUS
 282         if (overwrite || !iface->ifname[0])
 283                 ifname = ubus_get_ifname(name);
 284 #endif
 285
 286         if (overwrite) {
 287                 if ((c = tb[IFACE_ATTR_IFNAME]))
 288                         ifname = blobmsg_get_string(c);
 289                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 290                         ifname = blobmsg_get_string(c);
 291         }
 292
 293         if (!iface->ifname[0] && !ifname)
 294                 return -1;
 295
 296         if (ifname)
 297                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 298
 299         iface->inuse = true;
 300
 301         if (overwrite)
 302                 clean_interface(iface);
 303
 304         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 305                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 306
 307         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 308                 iface->ignore = blobmsg_get_bool(c);
 309
 310         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 311                 char *val = blobmsg_get_string(c), *endptr;
 312                 double time = strtod(val, &endptr);
 313                 if (time && endptr[0]) {
 314                         if (endptr[0] == 's')
 315                                 time *= 1;
 316                         else if (endptr[0] == 'm')
 317                                 time *= 60;
 318                         else if (endptr[0] == 'h')
 319                                 time *= 3600;
 320                         else if (endptr[0] == 'd')
 321                                 time *= 24 * 3600;
 322                         else if (endptr[0] == 'w')
 323                                 time *= 7 * 24 * 3600;
 324                         else
 325                                 goto err;
 326                 }
 327
 328                 if (time >= 60)
 329                         iface->dhcpv4_leasetime = time;
 330         }
 331
 332         if ((c = tb[IFACE_ATTR_START])) {
 333                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 334
 335                 if (config.legacy)
 336                         iface->dhcpv4 = RELAYD_SERVER;
 337         }
 338
 339         if ((c = tb[IFACE_ATTR_LIMIT]))
 340                 iface->dhcpv4_end.s_addr = htonl(
 341                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 342
 343         if ((c = tb[IFACE_ATTR_MASTER]))
 344                 iface->master = blobmsg_get_bool(c);
 345
 346         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 347                 struct blob_attr *cur;
 348                 unsigned rem;
 349
 350                 blobmsg_for_each_attr(cur, c, rem) {
 351                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 352                                 continue;
 353
 354                         iface->upstream = realloc(iface->upstream,
 355                                         iface->upstream_len + blobmsg_data_len(cur));
 356                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 357                         iface->upstream_len += blobmsg_data_len(cur);
 358                 }
 359         }
 360
 361         int mode;
 362         if ((c = tb[IFACE_ATTR_RA])) {
 363                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 364                         iface->ra = mode;
 365                 else
 366                         goto err;
 367         }
 368
 369         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 370                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 371                         iface->dhcpv4 = mode;
 372                 else
 373                         goto err;
 374         }
 375
 376         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 377                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 378                         iface->dhcpv6 = mode;
 379                 else
 380                         goto err;
 381         }
 382
 383         if ((c = tb[IFACE_ATTR_NDP])) {
 384                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 385                         iface->ndp = mode;
 386                 else
 387                         goto err;
 388         }
 389
 390         if ((c = tb[IFACE_ATTR_DNS])) {
 391                 struct blob_attr *cur;
 392                 unsigned rem;
 393
 394                 iface->always_rewrite_dns = true;
 395                 blobmsg_for_each_attr(cur, c, rem) {
 396                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 397                                 continue;
 398
 399                         struct in_addr addr4;
 400                         struct in6_addr addr6;
 401                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 402                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 403                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 404                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 405                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 406                                 iface->dns = realloc(iface->dns,
 407                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 408                                 iface->dns[iface->dns_cnt - 1] = addr6;
 409                         } else {
 410                                 goto err;
 411                         }
 412                 }
 413         }
 414
 415         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 416                 struct blob_attr *cur;
 417                 unsigned rem;
 418
 419                 blobmsg_for_each_attr(cur, c, rem) {
 420                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 421                                 continue;
 422
 423                         uint8_t buf[256];
 424                         int len = dn_comp(blobmsg_get_string(cur), buf, sizeof(buf), NULL, NULL);
 425                         if (len <= 0)
 426                                 goto err;
 427
 428                         iface->search = realloc(iface->search, iface->search_len + len);
 429                         memcpy(&iface->search[iface->search_len], buf, len);
 430                         iface->search_len += len;
 431                 }
 432         }
 433
 434         if ((c = tb[IFACE_ATTR_ULA_COMPAT]))
 435                 iface->deprecate_ula_if_public_avail = blobmsg_get_bool(c);
 436
 437         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 438                 iface->default_router = blobmsg_get_u32(c);
 439
 440         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 441                 iface->managed = blobmsg_get_u32(c);
 442
 443         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 444                 iface->ra_not_onlink = blobmsg_get_bool(c);
 445
 446         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 447                 const char *prio = blobmsg_get_string(c);
 448
 449                 if (!strcmp(prio, "high"))
 450                         iface->route_preference = 1;
 451                 else if (!strcmp(prio, "low"))
 452                         iface->route_preference = -1;
 453                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 454                         iface->route_preference = 0;
 455                 else
 456                         goto err;
 457         }
 458
 459         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 460                 iface->learn_routes = blobmsg_get_bool(c);
 461
 462         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 463                 iface->external = blobmsg_get_bool(c);
 464
 465         if ((c = tb[IFACE_ATTR_NDPROXY_STATIC])) {
 466                 struct blob_attr *cur;
 467                 unsigned rem;
 468
 469                 blobmsg_for_each_attr(cur, c, rem) {
 470                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 471                                 continue;
 472
 473                         int len = blobmsg_data_len(cur);
 474                         iface->static_ndp = realloc(iface->static_ndp, iface->static_ndp_len + len);
 475                         memcpy(&iface->static_ndp[iface->static_ndp_len], blobmsg_get_string(cur), len);
 476                         iface->static_ndp_len += len;
 477                 }
 478         }
 479
 480         iface->ignore = (iface->ifindex = if_nametoindex(iface->ifname)) < 0;
 481         return 0;
 482
 483 err:
 484         close_interface(iface);
 485         return -1;
 486 }
 487
 488 static int set_interface(struct uci_section *s)
 489 {
 490         blob_buf_init(&b, 0);
 491         uci_to_blob(&b, s, &interface_attr_list);
 492         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 493 }
 494
 495
 496 void odhcpd_reload(void)
 497 {
 498         struct uci_context *uci = uci_alloc_context();
 499         struct lease *l;
 500         list_for_each_entry(l, &leases, head) {
 501                 list_del(&l->head);
 502                 free(l->duid);
 503                 free(l);
 504         }
 505
 506         struct uci_package *dhcp = NULL;
 507         if (!uci_load(uci, "dhcp", &dhcp)) {
 508                 struct uci_element *e;
 509                 uci_foreach_element(&dhcp->sections, e) {
 510                         struct uci_section *s = uci_to_section(e);
 511                         if (!strcmp(s->type, "lease"))
 512                                 set_lease(s);
 513                         else if (!strcmp(s->type, "odhcpd"))
 514                                 set_config(s);
 515                 }
 516
 517                 uci_foreach_element(&dhcp->sections, e) {
 518                         struct uci_section *s = uci_to_section(e);
 519                         if (!strcmp(s->type, "dhcp"))
 520                                 set_interface(s);
 521                 }
 522         }
 523
 524 #ifdef WITH_UBUS
 525         ubus_apply_network();
 526 #endif
 527
 528         // Evaluate hybrid mode for master
 529         struct interface *master = NULL, *i, *n;
 530         list_for_each_entry(i, &interfaces, head) {
 531                 if (!i->master)
 532                         continue;
 533
 534                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 535 #ifdef WITH_UBUS
 536                 if (ubus_has_prefix(i->name, i->ifname))
 537                         hybrid_mode = RELAYD_RELAY;
 538 #endif
 539
 540                 if (i->dhcpv6 == RELAYD_HYBRID)
 541                         i->dhcpv6 = hybrid_mode;
 542
 543                 if (i->ra == RELAYD_HYBRID)
 544                         i->ra = hybrid_mode;
 545
 546                 if (i->ndp == RELAYD_HYBRID)
 547                         i->ndp = hybrid_mode;
 548
 549                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 550                         master = i;
 551         }
 552
 553
 554         list_for_each_entry_safe(i, n, &interfaces, head) {
 555                 if (i->inuse) {
 556                         // Resolve hybrid mode
 557                         if (i->dhcpv6 == RELAYD_HYBRID)
 558                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 559                                                 RELAYD_RELAY : RELAYD_SERVER;
 560
 561                         if (i->ra == RELAYD_HYBRID)
 562                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 563                                                 RELAYD_RELAY : RELAYD_SERVER;
 564
 565                         if (i->ndp == RELAYD_HYBRID)
 566                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 567                                                 RELAYD_RELAY : RELAYD_SERVER;
 568
 569                         setup_router_interface(i, true);
 570                         setup_dhcpv6_interface(i, true);
 571                         setup_ndp_interface(i, true);
 572                         setup_dhcpv4_interface(i, true);
 573                         i->inuse = false;
 574                 } else {
 575                         close_interface(i);
 576                 }
 577         }
 578
 579         uci_unload(uci, dhcp);
 580         uci_free_context(uci);
 581 }
 582
 583
 584 static void handle_signal(int signal)
 585 {
 586         char b[1] = {0};
 587         if (signal == SIGHUP)
 588                 write(reload_pipe[1], b, sizeof(b));
 589         else
 590                 uloop_end();
 591 }
 592
 593
 594
 595 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 596 {
 597         char b[512];
 598         read(u->fd, b, sizeof(b));
 599         odhcpd_reload();
 600 }
 601
 602 static struct uloop_fd reload_fd = { .cb = reload_cb };
 603
 604 void odhcpd_run(void)
 605 {
 606         pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC);
 607         reload_fd.fd = reload_pipe[0];
 608         uloop_fd_add(&reload_fd, ULOOP_READ);
 609
 610         signal(SIGTERM, handle_signal);
 611         signal(SIGINT, handle_signal);
 612         signal(SIGHUP, handle_signal);
 613
 614 #ifdef WITH_UBUS
 615         init_ubus();
 616 #endif
 617
 618         odhcpd_reload();
 619         uloop_run();
 620 }
 621