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_DHCPV6_RAW,
  36         IFACE_ATTR_RA_DEFAULT,
  37         IFACE_ATTR_RA_MANAGEMENT,
  38         IFACE_ATTR_RA_OFFLINK,
  39         IFACE_ATTR_RA_PREFERENCE,
  40         IFACE_ATTR_PD_MANAGER,
  41         IFACE_ATTR_PD_CER,
  42         IFACE_ATTR_NDPROXY_ROUTING,
  43         IFACE_ATTR_NDPROXY_SLAVE,
  44         IFACE_ATTR_NDPROXY_STATIC,
  45         IFACE_ATTR_MAX
  46 };
  47
  48 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  49         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  50         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  53         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  55         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  56         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  57         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  58         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  64         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  70         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  71         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  73         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  74         [IFACE_ATTR_NDPROXY_STATIC] = { .name = "ndproxy_static", .type = BLOBMSG_TYPE_ARRAY },
  75 };
  76
  77 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  78         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_NDPROXY_STATIC] = { .type = BLOBMSG_TYPE_STRING },
  82 };
  83
  84 const struct uci_blob_param_list interface_attr_list = {
  85         .n_params = IFACE_ATTR_MAX,
  86         .params = iface_attrs,
  87         .info = iface_attr_info,
  88 };
  89
  90
  91 enum {
  92         LEASE_ATTR_IP,
  93         LEASE_ATTR_MAC,
  94         LEASE_ATTR_DUID,
  95         LEASE_ATTR_HOSTID,
  96         LEASE_ATTR_NAME,
  97         LEASE_ATTR_MAX
  98 };
  99
 100
 101 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 102         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 103         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 104         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 105         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 106         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 107 };
 108
 109
 110 const struct uci_blob_param_list lease_attr_list = {
 111         .n_params = LEASE_ATTR_MAX,
 112         .params = lease_attrs,
 113 };
 114
 115
 116 enum {
 117         ODHCPD_ATTR_MAINDHCP,
 118         ODHCPD_ATTR_LEASEFILE,
 119         ODHCPD_ATTR_LEASETRIGGER,
 120         ODHCPD_ATTR_MAX
 121 };
 122
 123
 124 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 125         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 126         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 127         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 128 };
 129
 130
 131 const struct uci_blob_param_list odhcpd_attr_list = {
 132         .n_params = ODHCPD_ATTR_MAX,
 133         .params = odhcpd_attrs,
 134 };
 135
 136
 137 static struct interface* get_interface(const char *name)
 138 {
 139         struct interface *c;
 140         list_for_each_entry(c, &interfaces, head)
 141                 if (!strcmp(c->name, name))
 142                         return c;
 143         return NULL;
 144 }
 145
 146
 147 static void clean_interface(struct interface *iface)
 148 {
 149         free(iface->dns);
 150         free(iface->search);
 151         free(iface->upstream);
 152         free(iface->static_ndp);
 153         free(iface->dhcpv4_dns);
 154         free(iface->dhcpv6_raw);
 155         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 156 }
 157
 158
 159 static void close_interface(struct interface *iface)
 160 {
 161         if (iface->head.next)
 162                 list_del(&iface->head);
 163
 164         setup_router_interface(iface, false);
 165         setup_dhcpv6_interface(iface, false);
 166         setup_ndp_interface(iface, false);
 167         setup_dhcpv4_interface(iface, false);
 168
 169         clean_interface(iface);
 170         free(iface);
 171 }
 172
 173
 174 static int parse_mode(const char *mode)
 175 {
 176         if (!strcmp(mode, "disabled")) {
 177                 return RELAYD_DISABLED;
 178         } else if (!strcmp(mode, "server")) {
 179                 return RELAYD_SERVER;
 180         } else if (!strcmp(mode, "relay")) {
 181                 return RELAYD_RELAY;
 182         } else if (!strcmp(mode, "hybrid")) {
 183                 return RELAYD_HYBRID;
 184         } else {
 185                 return -1;
 186         }
 187 }
 188
 189
 190 static void set_config(struct uci_section *s)
 191 {
 192         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 193
 194         blob_buf_init(&b, 0);
 195         uci_to_blob(&b, s, &odhcpd_attr_list);
 196         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 197
 198         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 199                 config.legacy = blobmsg_get_bool(c);
 200
 201         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 202                 free(config.dhcp_statefile);
 203                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 204         }
 205
 206         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 207                 free(config.dhcp_cb);
 208                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 209         }
 210 }
 211
 212
 213 static int set_lease(struct uci_section *s)
 214 {
 215         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 216
 217         blob_buf_init(&b, 0);
 218         uci_to_blob(&b, s, &lease_attr_list);
 219         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 220
 221         size_t hostlen = 1;
 222         if ((c = tb[LEASE_ATTR_NAME]))
 223                 hostlen = blobmsg_data_len(c);
 224
 225         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 226         if (!lease)
 227                 goto err;
 228
 229         if (hostlen > 1)
 230                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 231
 232         if ((c = tb[LEASE_ATTR_IP]))
 233                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 234                         goto err;
 235
 236         if ((c = tb[LEASE_ATTR_MAC]))
 237                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 238                         goto err;
 239
 240         if ((c = tb[LEASE_ATTR_DUID])) {
 241                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 242                 lease->duid = malloc(duidlen);
 243                 if (!lease->duid)
 244                         goto err;
 245
 246                 ssize_t len = odhcpd_unhexlify(lease->duid,
 247                                 duidlen, blobmsg_get_string(c));
 248
 249                 if (len < 0)
 250                         goto err;
 251
 252                 lease->duid_len = len;
 253         }
 254
 255         if ((c = tb[LEASE_ATTR_HOSTID]))
 256                 if (odhcpd_unhexlify((uint8_t*)&lease->hostid, sizeof(lease->hostid),
 257                                 blobmsg_get_string(c)) < 0)
 258                         goto err;
 259
 260         list_add(&lease->head, &leases);
 261         return 0;
 262
 263 err:
 264         if (lease) {
 265                 free(lease->duid);
 266                 free(lease);
 267         }
 268         return -1;
 269 }
 270
 271
 272 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 273 {
 274         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 275         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 276
 277         if (tb[IFACE_ATTR_INTERFACE])
 278                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 279
 280         if (!name)
 281                 return -1;
 282
 283         struct interface *iface = get_interface(name);
 284         if (!iface) {
 285                 iface = calloc(1, sizeof(*iface));
 286                 if (!iface)
 287                         return -1;
 288
 289                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 290                 list_add(&iface->head, &interfaces);
 291                 overwrite = true;
 292         }
 293
 294         const char *ifname = NULL;
 295 #ifdef WITH_UBUS
 296         if (overwrite || !iface->ifname[0])
 297                 ifname = ubus_get_ifname(name);
 298 #endif
 299
 300         if (overwrite) {
 301                 if ((c = tb[IFACE_ATTR_IFNAME]))
 302                         ifname = blobmsg_get_string(c);
 303                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 304                         ifname = blobmsg_get_string(c);
 305         }
 306
 307         if (!iface->ifname[0] && !ifname)
 308                 return -1;
 309
 310         if (ifname)
 311                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 312
 313         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 314                 return -1;
 315
 316         iface->inuse = true;
 317
 318         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 319                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 320
 321         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 322                 iface->ignore = blobmsg_get_bool(c);
 323
 324         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 325                 char *val = blobmsg_get_string(c), *endptr;
 326                 double time = strtod(val, &endptr);
 327                 if (time && endptr[0]) {
 328                         if (endptr[0] == 's')
 329                                 time *= 1;
 330                         else if (endptr[0] == 'm')
 331                                 time *= 60;
 332                         else if (endptr[0] == 'h')
 333                                 time *= 3600;
 334                         else if (endptr[0] == 'd')
 335                                 time *= 24 * 3600;
 336                         else if (endptr[0] == 'w')
 337                                 time *= 7 * 24 * 3600;
 338                         else
 339                                 goto err;
 340                 }
 341
 342                 if (time >= 60)
 343                         iface->dhcpv4_leasetime = time;
 344         }
 345
 346         if ((c = tb[IFACE_ATTR_START])) {
 347                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 348
 349                 if (config.legacy)
 350                         iface->dhcpv4 = RELAYD_SERVER;
 351         }
 352
 353         if ((c = tb[IFACE_ATTR_LIMIT]))
 354                 iface->dhcpv4_end.s_addr = htonl(
 355                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 356
 357         if ((c = tb[IFACE_ATTR_MASTER]))
 358                 iface->master = blobmsg_get_bool(c);
 359
 360         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 361                 struct blob_attr *cur;
 362                 unsigned rem;
 363
 364                 blobmsg_for_each_attr(cur, c, rem) {
 365                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 366                                 continue;
 367
 368                         iface->upstream = realloc(iface->upstream,
 369                                         iface->upstream_len + blobmsg_data_len(cur));
 370                         if (!iface->upstream)
 371                                 goto err;
 372
 373                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 374                         iface->upstream_len += blobmsg_data_len(cur);
 375                 }
 376         }
 377
 378         int mode;
 379         if ((c = tb[IFACE_ATTR_RA])) {
 380                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 381                         iface->ra = mode;
 382                 else
 383                         goto err;
 384         }
 385
 386         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 387                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 388                         iface->dhcpv4 = mode;
 389                 else
 390                         goto err;
 391         }
 392
 393         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 394                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 395                         iface->dhcpv6 = mode;
 396                 else
 397                         goto err;
 398         }
 399
 400         if ((c = tb[IFACE_ATTR_NDP])) {
 401                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 402                         iface->ndp = mode;
 403                 else
 404                         goto err;
 405         }
 406
 407         if ((c = tb[IFACE_ATTR_DNS])) {
 408                 struct blob_attr *cur;
 409                 unsigned rem;
 410
 411                 iface->always_rewrite_dns = true;
 412                 blobmsg_for_each_attr(cur, c, rem) {
 413                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 414                                 continue;
 415
 416                         struct in_addr addr4;
 417                         struct in6_addr addr6;
 418                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 419                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 420                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 421                                 if (!iface->dhcpv4_dns)
 422                                         goto err;
 423
 424                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 425                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 426                                 iface->dns = realloc(iface->dns,
 427                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 428                                 if (!iface->dns)
 429                                         goto err;
 430
 431                                 iface->dns[iface->dns_cnt - 1] = addr6;
 432                         } else {
 433                                 goto err;
 434                         }
 435                 }
 436         }
 437
 438         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 439                 struct blob_attr *cur;
 440                 unsigned rem;
 441
 442                 blobmsg_for_each_attr(cur, c, rem) {
 443                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 444                                 continue;
 445
 446                         uint8_t buf[256];
 447                         int len = dn_comp(blobmsg_get_string(cur), buf, sizeof(buf), NULL, NULL);
 448                         if (len <= 0)
 449                                 goto err;
 450
 451                         iface->search = realloc(iface->search, iface->search_len + len);
 452                         if (!iface->search)
 453                                 goto err;
 454
 455                         memcpy(&iface->search[iface->search_len], buf, len);
 456                         iface->search_len += len;
 457                 }
 458         }
 459
 460         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 461                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 462                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 463                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 464         }
 465
 466         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 467                 iface->default_router = blobmsg_get_u32(c);
 468
 469         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 470                 iface->managed = blobmsg_get_u32(c);
 471         else if (overwrite)
 472                 iface->managed = 1;
 473
 474         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 475                 iface->ra_not_onlink = blobmsg_get_bool(c);
 476
 477         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 478                 const char *prio = blobmsg_get_string(c);
 479
 480                 if (!strcmp(prio, "high"))
 481                         iface->route_preference = 1;
 482                 else if (!strcmp(prio, "low"))
 483                         iface->route_preference = -1;
 484                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 485                         iface->route_preference = 0;
 486                 else
 487                         goto err;
 488         }
 489
 490         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 491                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 492                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 493
 494         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 495                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 496                 goto err;
 497
 498         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 499                 iface->learn_routes = blobmsg_get_bool(c);
 500         else if (overwrite)
 501                 iface->learn_routes = true;
 502
 503         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 504                 iface->external = blobmsg_get_bool(c);
 505
 506         if ((c = tb[IFACE_ATTR_NDPROXY_STATIC])) {
 507                 struct blob_attr *cur;
 508                 unsigned rem;
 509
 510                 blobmsg_for_each_attr(cur, c, rem) {
 511                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 512                                 continue;
 513
 514                         int len = blobmsg_data_len(cur);
 515                         iface->static_ndp = realloc(iface->static_ndp, iface->static_ndp_len + len);
 516                         if (!iface->static_ndp)
 517                                 goto err;
 518
 519                         if (iface->static_ndp_len)
 520                                 iface->static_ndp[iface->static_ndp_len - 1] = ' ';
 521
 522                         memcpy(&iface->static_ndp[iface->static_ndp_len], blobmsg_get_string(cur), len);
 523                         iface->static_ndp_len += len;
 524                 }
 525         }
 526
 527         return 0;
 528
 529 err:
 530         close_interface(iface);
 531         return -1;
 532 }
 533
 534 static int set_interface(struct uci_section *s)
 535 {
 536         blob_buf_init(&b, 0);
 537         uci_to_blob(&b, s, &interface_attr_list);
 538         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 539 }
 540
 541
 542 void odhcpd_reload(void)
 543 {
 544         struct uci_context *uci = uci_alloc_context();
 545         while (!list_empty(&leases)) {
 546                 struct lease *l = list_first_entry(&leases, struct lease, head);
 547                 list_del(&l->head);
 548                 free(l->duid);
 549                 free(l);
 550         }
 551
 552         struct interface *master = NULL, *i, *n;
 553
 554         if (!uci)
 555                 return;
 556
 557         list_for_each_entry(i, &interfaces, head)
 558                 clean_interface(i);
 559
 560         struct uci_package *dhcp = NULL;
 561         if (!uci_load(uci, "dhcp", &dhcp)) {
 562                 struct uci_element *e;
 563                 uci_foreach_element(&dhcp->sections, e) {
 564                         struct uci_section *s = uci_to_section(e);
 565                         if (!strcmp(s->type, "host"))
 566                                 set_lease(s);
 567                         else if (!strcmp(s->type, "odhcpd"))
 568                                 set_config(s);
 569                 }
 570
 571                 uci_foreach_element(&dhcp->sections, e) {
 572                         struct uci_section *s = uci_to_section(e);
 573                         if (!strcmp(s->type, "dhcp"))
 574                                 set_interface(s);
 575                 }
 576         }
 577
 578
 579 #ifdef WITH_UBUS
 580         ubus_apply_network();
 581 #endif
 582
 583         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 584
 585         // Test for
 586         list_for_each_entry(i, &interfaces, head) {
 587                 if (i->master)
 588                         continue;
 589
 590                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 591                         any_dhcpv6_slave = true;
 592
 593                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 594                         any_ra_slave = true;
 595
 596                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 597                         any_ndp_slave = true;
 598         }
 599
 600         // Evaluate hybrid mode for master
 601         list_for_each_entry(i, &interfaces, head) {
 602                 if (!i->master)
 603                         continue;
 604
 605                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 606 #ifdef WITH_UBUS
 607                 if (!ubus_has_prefix(i->name, i->ifname))
 608                         hybrid_mode = RELAYD_RELAY;
 609 #endif
 610
 611                 if (i->dhcpv6 == RELAYD_HYBRID)
 612                         i->dhcpv6 = hybrid_mode;
 613
 614                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 615                         i->dhcpv6 = RELAYD_DISABLED;
 616
 617                 if (i->ra == RELAYD_HYBRID)
 618                         i->ra = hybrid_mode;
 619
 620                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 621                         i->ra = RELAYD_DISABLED;
 622
 623                 if (i->ndp == RELAYD_HYBRID)
 624                         i->ndp = hybrid_mode;
 625
 626                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 627                         i->ndp = RELAYD_DISABLED;
 628
 629                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 630                         master = i;
 631         }
 632
 633
 634         list_for_each_entry_safe(i, n, &interfaces, head) {
 635                 if (i->inuse) {
 636                         // Resolve hybrid mode
 637                         if (i->dhcpv6 == RELAYD_HYBRID)
 638                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 639                                                 RELAYD_RELAY : RELAYD_SERVER;
 640
 641                         if (i->ra == RELAYD_HYBRID)
 642                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 643                                                 RELAYD_RELAY : RELAYD_SERVER;
 644
 645                         if (i->ndp == RELAYD_HYBRID)
 646                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 647                                                 RELAYD_RELAY : RELAYD_DISABLED;
 648
 649                         setup_router_interface(i, true);
 650                         setup_dhcpv6_interface(i, true);
 651                         setup_ndp_interface(i, true);
 652                         setup_dhcpv4_interface(i, true);
 653                 } else {
 654                         close_interface(i);
 655                 }
 656         }
 657
 658         uci_unload(uci, dhcp);
 659         uci_free_context(uci);
 660 }
 661
 662
 663 static void handle_signal(int signal)
 664 {
 665         char b[1] = {0};
 666         if (signal == SIGHUP)
 667                 write(reload_pipe[1], b, sizeof(b));
 668         else
 669                 uloop_end();
 670 }
 671
 672
 673
 674 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 675 {
 676         char b[512];
 677         read(u->fd, b, sizeof(b));
 678         odhcpd_reload();
 679 }
 680
 681 static struct uloop_fd reload_fd = { .cb = reload_cb };
 682
 683 void odhcpd_run(void)
 684 {
 685         pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC);
 686         reload_fd.fd = reload_pipe[0];
 687         uloop_fd_add(&reload_fd, ULOOP_READ);
 688
 689         signal(SIGTERM, handle_signal);
 690         signal(SIGINT, handle_signal);
 691         signal(SIGHUP, handle_signal);
 692
 693 #ifdef WITH_UBUS
 694         while (init_ubus())
 695                 sleep(1);
 696 #endif
 697
 698         odhcpd_reload();
 699         uloop_run();
 700 }
 701