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_FILTER_CLASS,
  36         IFACE_ATTR_DHCPV6_RAW,
  37         IFACE_ATTR_RA_DEFAULT,
  38         IFACE_ATTR_RA_MANAGEMENT,
  39         IFACE_ATTR_RA_OFFLINK,
  40         IFACE_ATTR_RA_PREFERENCE,
  41         IFACE_ATTR_PD_MANAGER,
  42         IFACE_ATTR_PD_CER,
  43         IFACE_ATTR_NDPROXY_ROUTING,
  44         IFACE_ATTR_NDPROXY_SLAVE,
  45         IFACE_ATTR_NDPROXY_STATIC,
  46         IFACE_ATTR_MAX
  47 };
  48
  49 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  50         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  57         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  58         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  60         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  66         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  71         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  72         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  73         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  75         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  76         [IFACE_ATTR_NDPROXY_STATIC] = { .name = "ndproxy_static", .type = BLOBMSG_TYPE_ARRAY },
  77 };
  78
  79 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  80         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_NDPROXY_STATIC] = { .type = BLOBMSG_TYPE_STRING },
  84 };
  85
  86 const struct uci_blob_param_list interface_attr_list = {
  87         .n_params = IFACE_ATTR_MAX,
  88         .params = iface_attrs,
  89         .info = iface_attr_info,
  90 };
  91
  92
  93 enum {
  94         LEASE_ATTR_IP,
  95         LEASE_ATTR_MAC,
  96         LEASE_ATTR_DUID,
  97         LEASE_ATTR_HOSTID,
  98         LEASE_ATTR_NAME,
  99         LEASE_ATTR_MAX
 100 };
 101
 102
 103 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 104         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 105         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 106         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 107         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 108         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 109 };
 110
 111
 112 const struct uci_blob_param_list lease_attr_list = {
 113         .n_params = LEASE_ATTR_MAX,
 114         .params = lease_attrs,
 115 };
 116
 117
 118 enum {
 119         ODHCPD_ATTR_MAINDHCP,
 120         ODHCPD_ATTR_LEASEFILE,
 121         ODHCPD_ATTR_LEASETRIGGER,
 122         ODHCPD_ATTR_MAX
 123 };
 124
 125
 126 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 127         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 128         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 129         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 130 };
 131
 132
 133 const struct uci_blob_param_list odhcpd_attr_list = {
 134         .n_params = ODHCPD_ATTR_MAX,
 135         .params = odhcpd_attrs,
 136 };
 137
 138
 139 static struct interface* get_interface(const char *name)
 140 {
 141         struct interface *c;
 142         list_for_each_entry(c, &interfaces, head)
 143                 if (!strcmp(c->name, name))
 144                         return c;
 145         return NULL;
 146 }
 147
 148
 149 static void clean_interface(struct interface *iface)
 150 {
 151         free(iface->dns);
 152         free(iface->search);
 153         free(iface->upstream);
 154         free(iface->static_ndp);
 155         free(iface->dhcpv4_dns);
 156         free(iface->dhcpv6_raw);
 157         free(iface->filter_class);
 158         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 159 }
 160
 161
 162 static void close_interface(struct interface *iface)
 163 {
 164         if (iface->head.next)
 165                 list_del(&iface->head);
 166
 167         setup_router_interface(iface, false);
 168         setup_dhcpv6_interface(iface, false);
 169         setup_ndp_interface(iface, false);
 170         setup_dhcpv4_interface(iface, false);
 171
 172         clean_interface(iface);
 173         free(iface);
 174 }
 175
 176
 177 static int parse_mode(const char *mode)
 178 {
 179         if (!strcmp(mode, "disabled")) {
 180                 return RELAYD_DISABLED;
 181         } else if (!strcmp(mode, "server")) {
 182                 return RELAYD_SERVER;
 183         } else if (!strcmp(mode, "relay")) {
 184                 return RELAYD_RELAY;
 185         } else if (!strcmp(mode, "hybrid")) {
 186                 return RELAYD_HYBRID;
 187         } else {
 188                 return -1;
 189         }
 190 }
 191
 192
 193 static void set_config(struct uci_section *s)
 194 {
 195         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 196
 197         blob_buf_init(&b, 0);
 198         uci_to_blob(&b, s, &odhcpd_attr_list);
 199         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 200
 201         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 202                 config.legacy = blobmsg_get_bool(c);
 203
 204         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 205                 free(config.dhcp_statefile);
 206                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 207         }
 208
 209         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 210                 free(config.dhcp_cb);
 211                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 212         }
 213 }
 214
 215
 216 static int set_lease(struct uci_section *s)
 217 {
 218         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 219
 220         blob_buf_init(&b, 0);
 221         uci_to_blob(&b, s, &lease_attr_list);
 222         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 223
 224         size_t hostlen = 1;
 225         if ((c = tb[LEASE_ATTR_NAME]))
 226                 hostlen = blobmsg_data_len(c);
 227
 228         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 229         if (!lease)
 230                 goto err;
 231
 232         if (hostlen > 1)
 233                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 234
 235         if ((c = tb[LEASE_ATTR_IP]))
 236                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 237                         goto err;
 238
 239         if ((c = tb[LEASE_ATTR_MAC]))
 240                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 241                         goto err;
 242
 243         if ((c = tb[LEASE_ATTR_DUID])) {
 244                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 245                 lease->duid = malloc(duidlen);
 246                 if (!lease->duid)
 247                         goto err;
 248
 249                 ssize_t len = odhcpd_unhexlify(lease->duid,
 250                                 duidlen, blobmsg_get_string(c));
 251
 252                 if (len < 0)
 253                         goto err;
 254
 255                 lease->duid_len = len;
 256         }
 257
 258         if ((c = tb[LEASE_ATTR_HOSTID])) {
 259                 errno = 0;
 260                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 261                 if (errno)
 262                         goto err;
 263         }
 264
 265         list_add(&lease->head, &leases);
 266         return 0;
 267
 268 err:
 269         if (lease) {
 270                 free(lease->duid);
 271                 free(lease);
 272         }
 273         return -1;
 274 }
 275
 276
 277 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 278 {
 279         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 280         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 281
 282         if (tb[IFACE_ATTR_INTERFACE])
 283                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 284
 285         if (!name)
 286                 return -1;
 287
 288         struct interface *iface = get_interface(name);
 289         if (!iface) {
 290                 iface = calloc(1, sizeof(*iface));
 291                 if (!iface)
 292                         return -1;
 293
 294                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 295                 list_add(&iface->head, &interfaces);
 296                 overwrite = true;
 297         }
 298
 299         const char *ifname = NULL;
 300 #ifdef WITH_UBUS
 301         if (overwrite || !iface->ifname[0])
 302                 ifname = ubus_get_ifname(name);
 303 #endif
 304
 305         if (overwrite) {
 306                 if ((c = tb[IFACE_ATTR_IFNAME]))
 307                         ifname = blobmsg_get_string(c);
 308                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 309                         ifname = blobmsg_get_string(c);
 310         }
 311
 312         if (!iface->ifname[0] && !ifname)
 313                 return -1;
 314
 315         if (ifname)
 316                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 317
 318         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 319                 return -1;
 320
 321         iface->inuse = true;
 322
 323         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 324                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 325
 326         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 327                 iface->ignore = blobmsg_get_bool(c);
 328
 329         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 330                 char *val = blobmsg_get_string(c), *endptr;
 331                 double time = strtod(val, &endptr);
 332                 if (time && endptr[0]) {
 333                         if (endptr[0] == 's')
 334                                 time *= 1;
 335                         else if (endptr[0] == 'm')
 336                                 time *= 60;
 337                         else if (endptr[0] == 'h')
 338                                 time *= 3600;
 339                         else if (endptr[0] == 'd')
 340                                 time *= 24 * 3600;
 341                         else if (endptr[0] == 'w')
 342                                 time *= 7 * 24 * 3600;
 343                         else
 344                                 goto err;
 345                 }
 346
 347                 if (time >= 60)
 348                         iface->dhcpv4_leasetime = time;
 349         }
 350
 351         if ((c = tb[IFACE_ATTR_START])) {
 352                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 353
 354                 if (config.legacy)
 355                         iface->dhcpv4 = RELAYD_SERVER;
 356         }
 357
 358         if ((c = tb[IFACE_ATTR_LIMIT]))
 359                 iface->dhcpv4_end.s_addr = htonl(
 360                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 361
 362         if ((c = tb[IFACE_ATTR_MASTER]))
 363                 iface->master = blobmsg_get_bool(c);
 364
 365         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 366                 struct blob_attr *cur;
 367                 unsigned rem;
 368
 369                 blobmsg_for_each_attr(cur, c, rem) {
 370                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 371                                 continue;
 372
 373                         iface->upstream = realloc(iface->upstream,
 374                                         iface->upstream_len + blobmsg_data_len(cur));
 375                         if (!iface->upstream)
 376                                 goto err;
 377
 378                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 379                         iface->upstream_len += blobmsg_data_len(cur);
 380                 }
 381         }
 382
 383         int mode;
 384         if ((c = tb[IFACE_ATTR_RA])) {
 385                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 386                         iface->ra = mode;
 387                 else
 388                         goto err;
 389         }
 390
 391         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 392                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 393                         iface->dhcpv4 = mode;
 394                 else
 395                         goto err;
 396         }
 397
 398         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 399                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 400                         iface->dhcpv6 = mode;
 401                 else
 402                         goto err;
 403         }
 404
 405         if ((c = tb[IFACE_ATTR_NDP])) {
 406                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 407                         iface->ndp = mode;
 408                 else
 409                         goto err;
 410         }
 411
 412         if ((c = tb[IFACE_ATTR_DNS])) {
 413                 struct blob_attr *cur;
 414                 unsigned rem;
 415
 416                 iface->always_rewrite_dns = true;
 417                 blobmsg_for_each_attr(cur, c, rem) {
 418                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 419                                 continue;
 420
 421                         struct in_addr addr4;
 422                         struct in6_addr addr6;
 423                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 424                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 425                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 426                                 if (!iface->dhcpv4_dns)
 427                                         goto err;
 428
 429                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 430                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 431                                 iface->dns = realloc(iface->dns,
 432                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 433                                 if (!iface->dns)
 434                                         goto err;
 435
 436                                 iface->dns[iface->dns_cnt - 1] = addr6;
 437                         } else {
 438                                 goto err;
 439                         }
 440                 }
 441         }
 442
 443         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 444                 struct blob_attr *cur;
 445                 unsigned rem;
 446
 447                 blobmsg_for_each_attr(cur, c, rem) {
 448                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 449                                 continue;
 450
 451                         uint8_t buf[256];
 452                         char *domain = blobmsg_get_string(cur);
 453                         size_t domainlen = strlen(domain);
 454                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 455                                 domain[domainlen - 1] = 0;
 456
 457                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 458                         free(domain);
 459                         if (len <= 0)
 460                                 goto err;
 461
 462                         iface->search = realloc(iface->search, iface->search_len + len);
 463                         if (!iface->search)
 464                                 goto err;
 465
 466                         memcpy(&iface->search[iface->search_len], buf, len);
 467                         iface->search_len += len;
 468                 }
 469         }
 470
 471         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 472                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 473                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 474         }
 475
 476         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 477                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 478                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 479                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 480         }
 481
 482         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 483                 iface->default_router = blobmsg_get_u32(c);
 484
 485         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 486                 iface->managed = blobmsg_get_u32(c);
 487         else if (overwrite)
 488                 iface->managed = 1;
 489
 490         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 491                 iface->ra_not_onlink = blobmsg_get_bool(c);
 492
 493         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 494                 const char *prio = blobmsg_get_string(c);
 495
 496                 if (!strcmp(prio, "high"))
 497                         iface->route_preference = 1;
 498                 else if (!strcmp(prio, "low"))
 499                         iface->route_preference = -1;
 500                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 501                         iface->route_preference = 0;
 502                 else
 503                         goto err;
 504         }
 505
 506         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 507                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 508                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 509
 510         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 511                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 512                 goto err;
 513
 514         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 515                 iface->learn_routes = blobmsg_get_bool(c);
 516         else if (overwrite)
 517                 iface->learn_routes = true;
 518
 519         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 520                 iface->external = blobmsg_get_bool(c);
 521
 522         if ((c = tb[IFACE_ATTR_NDPROXY_STATIC])) {
 523                 struct blob_attr *cur;
 524                 unsigned rem;
 525
 526                 blobmsg_for_each_attr(cur, c, rem) {
 527                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 528                                 continue;
 529
 530                         int len = blobmsg_data_len(cur);
 531                         iface->static_ndp = realloc(iface->static_ndp, iface->static_ndp_len + len);
 532                         if (!iface->static_ndp)
 533                                 goto err;
 534
 535                         if (iface->static_ndp_len)
 536                                 iface->static_ndp[iface->static_ndp_len - 1] = ' ';
 537
 538                         memcpy(&iface->static_ndp[iface->static_ndp_len], blobmsg_get_string(cur), len);
 539                         iface->static_ndp_len += len;
 540                 }
 541         }
 542
 543         return 0;
 544
 545 err:
 546         close_interface(iface);
 547         return -1;
 548 }
 549
 550 static int set_interface(struct uci_section *s)
 551 {
 552         blob_buf_init(&b, 0);
 553         uci_to_blob(&b, s, &interface_attr_list);
 554         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 555 }
 556
 557
 558 void odhcpd_reload(void)
 559 {
 560         struct uci_context *uci = uci_alloc_context();
 561         while (!list_empty(&leases)) {
 562                 struct lease *l = list_first_entry(&leases, struct lease, head);
 563                 list_del(&l->head);
 564                 free(l->duid);
 565                 free(l);
 566         }
 567
 568         struct interface *master = NULL, *i, *n;
 569
 570         if (!uci)
 571                 return;
 572
 573         list_for_each_entry(i, &interfaces, head)
 574                 clean_interface(i);
 575
 576         struct uci_package *dhcp = NULL;
 577         if (!uci_load(uci, "dhcp", &dhcp)) {
 578                 struct uci_element *e;
 579                 uci_foreach_element(&dhcp->sections, e) {
 580                         struct uci_section *s = uci_to_section(e);
 581                         if (!strcmp(s->type, "host"))
 582                                 set_lease(s);
 583                         else if (!strcmp(s->type, "odhcpd"))
 584                                 set_config(s);
 585                 }
 586
 587                 uci_foreach_element(&dhcp->sections, e) {
 588                         struct uci_section *s = uci_to_section(e);
 589                         if (!strcmp(s->type, "dhcp"))
 590                                 set_interface(s);
 591                 }
 592         }
 593
 594
 595 #ifdef WITH_UBUS
 596         ubus_apply_network();
 597 #endif
 598
 599         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 600
 601         // Test for
 602         list_for_each_entry(i, &interfaces, head) {
 603                 if (i->master)
 604                         continue;
 605
 606                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 607                         any_dhcpv6_slave = true;
 608
 609                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 610                         any_ra_slave = true;
 611
 612                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 613                         any_ndp_slave = true;
 614         }
 615
 616         // Evaluate hybrid mode for master
 617         list_for_each_entry(i, &interfaces, head) {
 618                 if (!i->master)
 619                         continue;
 620
 621                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 622 #ifdef WITH_UBUS
 623                 if (!ubus_has_prefix(i->name, i->ifname))
 624                         hybrid_mode = RELAYD_RELAY;
 625 #endif
 626
 627                 if (i->dhcpv6 == RELAYD_HYBRID)
 628                         i->dhcpv6 = hybrid_mode;
 629
 630                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 631                         i->dhcpv6 = RELAYD_DISABLED;
 632
 633                 if (i->ra == RELAYD_HYBRID)
 634                         i->ra = hybrid_mode;
 635
 636                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 637                         i->ra = RELAYD_DISABLED;
 638
 639                 if (i->ndp == RELAYD_HYBRID)
 640                         i->ndp = hybrid_mode;
 641
 642                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 643                         i->ndp = RELAYD_DISABLED;
 644
 645                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 646                         master = i;
 647         }
 648
 649
 650         list_for_each_entry_safe(i, n, &interfaces, head) {
 651                 if (i->inuse) {
 652                         // Resolve hybrid mode
 653                         if (i->dhcpv6 == RELAYD_HYBRID)
 654                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 655                                                 RELAYD_RELAY : RELAYD_SERVER;
 656
 657                         if (i->ra == RELAYD_HYBRID)
 658                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 659                                                 RELAYD_RELAY : RELAYD_SERVER;
 660
 661                         if (i->ndp == RELAYD_HYBRID)
 662                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 663                                                 RELAYD_RELAY : RELAYD_DISABLED;
 664
 665                         setup_router_interface(i, true);
 666                         setup_dhcpv6_interface(i, true);
 667                         setup_ndp_interface(i, true);
 668                         setup_dhcpv4_interface(i, true);
 669                 } else {
 670                         close_interface(i);
 671                 }
 672         }
 673
 674         uci_unload(uci, dhcp);
 675         uci_free_context(uci);
 676 }
 677
 678
 679 static void handle_signal(int signal)
 680 {
 681         char b[1] = {0};
 682         if (signal == SIGHUP)
 683                 write(reload_pipe[1], b, sizeof(b));
 684         else
 685                 uloop_end();
 686 }
 687
 688
 689
 690 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 691 {
 692         char b[512];
 693         read(u->fd, b, sizeof(b));
 694         odhcpd_reload();
 695 }
 696
 697 static struct uloop_fd reload_fd = { .cb = reload_cb };
 698
 699 void odhcpd_run(void)
 700 {
 701         pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC);
 702         reload_fd.fd = reload_pipe[0];
 703         uloop_fd_add(&reload_fd, ULOOP_READ);
 704
 705         signal(SIGTERM, handle_signal);
 706         signal(SIGINT, handle_signal);
 707         signal(SIGHUP, handle_signal);
 708
 709 #ifdef WITH_UBUS
 710         while (init_ubus())
 711                 sleep(1);
 712 #endif
 713
 714         odhcpd_reload();
 715         uloop_run();
 716 }
 717