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_ROUTER,
  34         IFACE_ATTR_DNS,
  35         IFACE_ATTR_DOMAIN,
  36         IFACE_ATTR_FILTER_CLASS,
  37         IFACE_ATTR_DHCPV6_RAW,
  38         IFACE_ATTR_RA_DEFAULT,
  39         IFACE_ATTR_RA_MANAGEMENT,
  40         IFACE_ATTR_RA_OFFLINK,
  41         IFACE_ATTR_RA_PREFERENCE,
  42         IFACE_ATTR_RA_ADVROUTER,
  43         IFACE_ATTR_PD_MANAGER,
  44         IFACE_ATTR_PD_CER,
  45         IFACE_ATTR_NDPROXY_ROUTING,
  46         IFACE_ATTR_NDPROXY_SLAVE,
  47         IFACE_ATTR_MAX
  48 };
  49
  50 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  51         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  54         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  57         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  58         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  59         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  60         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  61         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  66         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  67         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  68         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  73         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  74         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  75         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  77         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  78         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  79 };
  80
  81 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  82         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  85 };
  86
  87 const struct uci_blob_param_list interface_attr_list = {
  88         .n_params = IFACE_ATTR_MAX,
  89         .params = iface_attrs,
  90         .info = iface_attr_info,
  91 };
  92
  93
  94 enum {
  95         LEASE_ATTR_IP,
  96         LEASE_ATTR_MAC,
  97         LEASE_ATTR_DUID,
  98         LEASE_ATTR_HOSTID,
  99         LEASE_ATTR_NAME,
 100         LEASE_ATTR_MAX
 101 };
 102
 103
 104 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 105         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 106         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 107         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 108         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 109         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 110 };
 111
 112
 113 const struct uci_blob_param_list lease_attr_list = {
 114         .n_params = LEASE_ATTR_MAX,
 115         .params = lease_attrs,
 116 };
 117
 118
 119 enum {
 120         ODHCPD_ATTR_MAINDHCP,
 121         ODHCPD_ATTR_LEASEFILE,
 122         ODHCPD_ATTR_LEASETRIGGER,
 123         ODHCPD_ATTR_MAX
 124 };
 125
 126
 127 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 128         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 129         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 130         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 131 };
 132
 133
 134 const struct uci_blob_param_list odhcpd_attr_list = {
 135         .n_params = ODHCPD_ATTR_MAX,
 136         .params = odhcpd_attrs,
 137 };
 138
 139
 140 static struct interface* get_interface(const char *name)
 141 {
 142         struct interface *c;
 143         list_for_each_entry(c, &interfaces, head)
 144                 if (!strcmp(c->name, name))
 145                         return c;
 146         return NULL;
 147 }
 148
 149
 150 static void clean_interface(struct interface *iface)
 151 {
 152         free(iface->dns);
 153         free(iface->search);
 154         free(iface->upstream);
 155         free(iface->dhcpv4_router);
 156         free(iface->dhcpv4_dns);
 157         free(iface->dhcpv6_raw);
 158         free(iface->filter_class);
 159         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 160 }
 161
 162
 163 static void close_interface(struct interface *iface)
 164 {
 165         if (iface->head.next)
 166                 list_del(&iface->head);
 167
 168         setup_router_interface(iface, false);
 169         setup_dhcpv6_interface(iface, false);
 170         setup_ndp_interface(iface, false);
 171         setup_dhcpv4_interface(iface, false);
 172
 173         clean_interface(iface);
 174         free(iface);
 175 }
 176
 177
 178 static int parse_mode(const char *mode)
 179 {
 180         if (!strcmp(mode, "disabled")) {
 181                 return RELAYD_DISABLED;
 182         } else if (!strcmp(mode, "server")) {
 183                 return RELAYD_SERVER;
 184         } else if (!strcmp(mode, "relay")) {
 185                 return RELAYD_RELAY;
 186         } else if (!strcmp(mode, "hybrid")) {
 187                 return RELAYD_HYBRID;
 188         } else {
 189                 return -1;
 190         }
 191 }
 192
 193
 194 static void set_config(struct uci_section *s)
 195 {
 196         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 197
 198         blob_buf_init(&b, 0);
 199         uci_to_blob(&b, s, &odhcpd_attr_list);
 200         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 201
 202         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 203                 config.legacy = blobmsg_get_bool(c);
 204
 205         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 206                 free(config.dhcp_statefile);
 207                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 208         }
 209
 210         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 211                 free(config.dhcp_cb);
 212                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 213         }
 214 }
 215
 216
 217 static int set_lease(struct uci_section *s)
 218 {
 219         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 220
 221         blob_buf_init(&b, 0);
 222         uci_to_blob(&b, s, &lease_attr_list);
 223         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 224
 225         size_t hostlen = 1;
 226         if ((c = tb[LEASE_ATTR_NAME]))
 227                 hostlen = blobmsg_data_len(c);
 228
 229         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 230         if (!lease)
 231                 goto err;
 232
 233         if (hostlen > 1)
 234                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 235
 236         if ((c = tb[LEASE_ATTR_IP]))
 237                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 238                         goto err;
 239
 240         if ((c = tb[LEASE_ATTR_MAC]))
 241                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 242                         goto err;
 243
 244         if ((c = tb[LEASE_ATTR_DUID])) {
 245                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 246                 lease->duid = malloc(duidlen);
 247                 if (!lease->duid)
 248                         goto err;
 249
 250                 ssize_t len = odhcpd_unhexlify(lease->duid,
 251                                 duidlen, blobmsg_get_string(c));
 252
 253                 if (len < 0)
 254                         goto err;
 255
 256                 lease->duid_len = len;
 257         }
 258
 259         if ((c = tb[LEASE_ATTR_HOSTID])) {
 260                 errno = 0;
 261                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 262                 if (errno)
 263                         goto err;
 264         }
 265
 266         list_add(&lease->head, &leases);
 267         return 0;
 268
 269 err:
 270         if (lease) {
 271                 free(lease->duid);
 272                 free(lease);
 273         }
 274         return -1;
 275 }
 276
 277
 278 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 279 {
 280         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 281         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 282
 283         if (tb[IFACE_ATTR_INTERFACE])
 284                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 285
 286         if (!name)
 287                 return -1;
 288
 289         struct interface *iface = get_interface(name);
 290         if (!iface) {
 291                 iface = calloc(1, sizeof(*iface));
 292                 if (!iface)
 293                         return -1;
 294
 295                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 296                 list_add(&iface->head, &interfaces);
 297                 overwrite = true;
 298         }
 299
 300         const char *ifname = NULL;
 301 #ifdef WITH_UBUS
 302         if (overwrite || !iface->ifname[0])
 303                 ifname = ubus_get_ifname(name);
 304 #endif
 305
 306         if (overwrite) {
 307                 if ((c = tb[IFACE_ATTR_IFNAME]))
 308                         ifname = blobmsg_get_string(c);
 309                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 310                         ifname = blobmsg_get_string(c);
 311         }
 312
 313         if (!iface->ifname[0] && !ifname)
 314                 return -1;
 315
 316         if (ifname)
 317                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 318
 319         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 320                 return -1;
 321
 322         iface->inuse = true;
 323
 324         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 325                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 326
 327         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 328                 iface->ignore = blobmsg_get_bool(c);
 329
 330         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 331                 char *val = blobmsg_get_string(c), *endptr;
 332                 double time = strtod(val, &endptr);
 333                 if (time && endptr[0]) {
 334                         if (endptr[0] == 's')
 335                                 time *= 1;
 336                         else if (endptr[0] == 'm')
 337                                 time *= 60;
 338                         else if (endptr[0] == 'h')
 339                                 time *= 3600;
 340                         else if (endptr[0] == 'd')
 341                                 time *= 24 * 3600;
 342                         else if (endptr[0] == 'w')
 343                                 time *= 7 * 24 * 3600;
 344                         else
 345                                 goto err;
 346                 }
 347
 348                 if (time >= 60)
 349                         iface->dhcpv4_leasetime = time;
 350         }
 351
 352         if ((c = tb[IFACE_ATTR_START])) {
 353                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 354
 355                 if (config.legacy)
 356                         iface->dhcpv4 = RELAYD_SERVER;
 357         }
 358
 359         if ((c = tb[IFACE_ATTR_LIMIT]))
 360                 iface->dhcpv4_end.s_addr = htonl(
 361                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 362
 363         if ((c = tb[IFACE_ATTR_MASTER]))
 364                 iface->master = blobmsg_get_bool(c);
 365
 366         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 367                 struct blob_attr *cur;
 368                 unsigned rem;
 369
 370                 blobmsg_for_each_attr(cur, c, rem) {
 371                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 372                                 continue;
 373
 374                         iface->upstream = realloc(iface->upstream,
 375                                         iface->upstream_len + blobmsg_data_len(cur));
 376                         if (!iface->upstream)
 377                                 goto err;
 378
 379                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 380                         iface->upstream_len += blobmsg_data_len(cur);
 381                 }
 382         }
 383
 384         int mode;
 385         if ((c = tb[IFACE_ATTR_RA])) {
 386                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 387                         iface->ra = mode;
 388                 else
 389                         goto err;
 390         }
 391
 392         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 393                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 394                         iface->dhcpv4 = mode;
 395                 else
 396                         goto err;
 397         }
 398
 399         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 400                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 401                         iface->dhcpv6 = mode;
 402                 else
 403                         goto err;
 404         }
 405
 406         if ((c = tb[IFACE_ATTR_NDP])) {
 407                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 408                         iface->ndp = mode;
 409                 else
 410                         goto err;
 411         }
 412
 413         if ((c = tb[IFACE_ATTR_ROUTER])) {
 414                 struct blob_attr *cur;
 415                 unsigned rem;
 416
 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                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 423                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 424                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 425                                 if (!iface->dhcpv4_router)
 426                                         goto err;
 427
 428                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 429                         } else {
 430                                 goto err;
 431                         }
 432                 }
 433         }
 434
 435         if ((c = tb[IFACE_ATTR_DNS])) {
 436                 struct blob_attr *cur;
 437                 unsigned rem;
 438
 439                 iface->always_rewrite_dns = true;
 440                 blobmsg_for_each_attr(cur, c, rem) {
 441                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 442                                 continue;
 443
 444                         struct in_addr addr4;
 445                         struct in6_addr addr6;
 446                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 447                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 448                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 449                                 if (!iface->dhcpv4_dns)
 450                                         goto err;
 451
 452                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 453                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 454                                 iface->dns = realloc(iface->dns,
 455                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 456                                 if (!iface->dns)
 457                                         goto err;
 458
 459                                 iface->dns[iface->dns_cnt - 1] = addr6;
 460                         } else {
 461                                 goto err;
 462                         }
 463                 }
 464         }
 465
 466         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 467                 struct blob_attr *cur;
 468                 unsigned rem;
 469
 470                 blobmsg_for_each_attr(cur, c, rem) {
 471                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, NULL))
 472                                 continue;
 473
 474                         uint8_t buf[256];
 475                         char *domain = blobmsg_get_string(cur);
 476                         size_t domainlen = strlen(domain);
 477                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 478                                 domain[domainlen - 1] = 0;
 479
 480                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 481                         if (len <= 0)
 482                                 goto err;
 483
 484                         iface->search = realloc(iface->search, iface->search_len + len);
 485                         if (!iface->search)
 486                                 goto err;
 487
 488                         memcpy(&iface->search[iface->search_len], buf, len);
 489                         iface->search_len += len;
 490                 }
 491         }
 492
 493         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 494                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 495                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 496         }
 497
 498         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 499                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 500                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 501                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 502         }
 503
 504         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 505                 iface->default_router = blobmsg_get_u32(c);
 506
 507         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 508                 iface->managed = blobmsg_get_u32(c);
 509         else if (overwrite)
 510                 iface->managed = 1;
 511
 512         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 513                 iface->ra_not_onlink = blobmsg_get_bool(c);
 514
 515         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 516                 iface->ra_advrouter = blobmsg_get_bool(c);
 517
 518         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 519                 const char *prio = blobmsg_get_string(c);
 520
 521                 if (!strcmp(prio, "high"))
 522                         iface->route_preference = 1;
 523                 else if (!strcmp(prio, "low"))
 524                         iface->route_preference = -1;
 525                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 526                         iface->route_preference = 0;
 527                 else
 528                         goto err;
 529         }
 530
 531         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 532                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 533                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 534
 535         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 536                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 537                 goto err;
 538
 539         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 540                 iface->learn_routes = blobmsg_get_bool(c);
 541         else if (overwrite)
 542                 iface->learn_routes = true;
 543
 544         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 545                 iface->external = blobmsg_get_bool(c);
 546
 547         return 0;
 548
 549 err:
 550         close_interface(iface);
 551         return -1;
 552 }
 553
 554 static int set_interface(struct uci_section *s)
 555 {
 556         blob_buf_init(&b, 0);
 557         uci_to_blob(&b, s, &interface_attr_list);
 558         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 559 }
 560
 561
 562 void odhcpd_reload(void)
 563 {
 564         struct uci_context *uci = uci_alloc_context();
 565         while (!list_empty(&leases)) {
 566                 struct lease *l = list_first_entry(&leases, struct lease, head);
 567                 list_del(&l->head);
 568                 free(l->duid);
 569                 free(l);
 570         }
 571
 572         struct interface *master = NULL, *i, *n;
 573
 574         if (!uci)
 575                 return;
 576
 577         list_for_each_entry(i, &interfaces, head)
 578                 clean_interface(i);
 579
 580         struct uci_package *dhcp = NULL;
 581         if (!uci_load(uci, "dhcp", &dhcp)) {
 582                 struct uci_element *e;
 583                 uci_foreach_element(&dhcp->sections, e) {
 584                         struct uci_section *s = uci_to_section(e);
 585                         if (!strcmp(s->type, "host"))
 586                                 set_lease(s);
 587                         else if (!strcmp(s->type, "odhcpd"))
 588                                 set_config(s);
 589                 }
 590
 591                 uci_foreach_element(&dhcp->sections, e) {
 592                         struct uci_section *s = uci_to_section(e);
 593                         if (!strcmp(s->type, "dhcp"))
 594                                 set_interface(s);
 595                 }
 596         }
 597
 598
 599 #ifdef WITH_UBUS
 600         ubus_apply_network();
 601 #endif
 602
 603         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 604
 605         // Test for
 606         list_for_each_entry(i, &interfaces, head) {
 607                 if (i->master)
 608                         continue;
 609
 610                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 611                         any_dhcpv6_slave = true;
 612
 613                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 614                         any_ra_slave = true;
 615
 616                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 617                         any_ndp_slave = true;
 618         }
 619
 620         // Evaluate hybrid mode for master
 621         list_for_each_entry(i, &interfaces, head) {
 622                 if (!i->master)
 623                         continue;
 624
 625                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 626 #ifdef WITH_UBUS
 627                 if (!ubus_has_prefix(i->name, i->ifname))
 628                         hybrid_mode = RELAYD_RELAY;
 629 #endif
 630
 631                 if (i->dhcpv6 == RELAYD_HYBRID)
 632                         i->dhcpv6 = hybrid_mode;
 633
 634                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 635                         i->dhcpv6 = RELAYD_DISABLED;
 636
 637                 if (i->ra == RELAYD_HYBRID)
 638                         i->ra = hybrid_mode;
 639
 640                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 641                         i->ra = RELAYD_DISABLED;
 642
 643                 if (i->ndp == RELAYD_HYBRID)
 644                         i->ndp = hybrid_mode;
 645
 646                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 647                         i->ndp = RELAYD_DISABLED;
 648
 649                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 650                         master = i;
 651         }
 652
 653
 654         list_for_each_entry_safe(i, n, &interfaces, head) {
 655                 if (i->inuse) {
 656                         // Resolve hybrid mode
 657                         if (i->dhcpv6 == RELAYD_HYBRID)
 658                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 659                                                 RELAYD_RELAY : RELAYD_SERVER;
 660
 661                         if (i->ra == RELAYD_HYBRID)
 662                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 663                                                 RELAYD_RELAY : RELAYD_SERVER;
 664
 665                         if (i->ndp == RELAYD_HYBRID)
 666                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 667                                                 RELAYD_RELAY : RELAYD_DISABLED;
 668
 669                         setup_router_interface(i, true);
 670                         setup_dhcpv6_interface(i, true);
 671                         setup_ndp_interface(i, true);
 672                         setup_dhcpv4_interface(i, true);
 673                 } else {
 674                         close_interface(i);
 675                 }
 676         }
 677
 678         uci_unload(uci, dhcp);
 679         uci_free_context(uci);
 680 }
 681
 682
 683 static void handle_signal(int signal)
 684 {
 685         char b[1] = {0};
 686
 687         if (signal == SIGHUP) {
 688                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 689         } else
 690                 uloop_end();
 691 }
 692
 693
 694
 695 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 696 {
 697         char b[512];
 698         if (read(u->fd, b, sizeof(b) < 0)) {}
 699         odhcpd_reload();
 700 }
 701
 702 static struct uloop_fd reload_fd = { .cb = reload_cb };
 703
 704 void odhcpd_run(void)
 705 {
 706         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 707         reload_fd.fd = reload_pipe[0];
 708         uloop_fd_add(&reload_fd, ULOOP_READ);
 709
 710         signal(SIGTERM, handle_signal);
 711         signal(SIGINT, handle_signal);
 712         signal(SIGHUP, handle_signal);
 713
 714 #ifdef WITH_UBUS
 715         while (init_ubus())
 716                 sleep(1);
 717 #endif
 718
 719         odhcpd_reload();
 720         uloop_run();
 721
 722         while (!list_empty(&interfaces))
 723                 close_interface(list_first_entry(&interfaces, struct interface, head));
 724 }
 725