src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <string.h>
   8 #include <sys/stat.h>
   9
  10 #include <uci.h>
  11 #include <uci_blob.h>
  12
  13 #include "odhcpd.h"
  14
  15 static struct blob_buf b;
  16 static int reload_pipe[2];
  17 struct list_head leases = LIST_HEAD_INIT(leases);
  18 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  19 struct config config = {false, NULL, NULL};
  20
  21 enum {
  22         IFACE_ATTR_INTERFACE,
  23         IFACE_ATTR_IFNAME,
  24         IFACE_ATTR_NETWORKID,
  25         IFACE_ATTR_DYNAMICDHCP,
  26         IFACE_ATTR_IGNORE,
  27         IFACE_ATTR_LEASETIME,
  28         IFACE_ATTR_LIMIT,
  29         IFACE_ATTR_START,
  30         IFACE_ATTR_MASTER,
  31         IFACE_ATTR_UPSTREAM,
  32         IFACE_ATTR_RA,
  33         IFACE_ATTR_DHCPV4,
  34         IFACE_ATTR_DHCPV6,
  35         IFACE_ATTR_NDP,
  36         IFACE_ATTR_ROUTER,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DOMAIN,
  39         IFACE_ATTR_FILTER_CLASS,
  40         IFACE_ATTR_DHCPV6_RAW,
  41         IFACE_ATTR_RA_DEFAULT,
  42         IFACE_ATTR_RA_MANAGEMENT,
  43         IFACE_ATTR_RA_OFFLINK,
  44         IFACE_ATTR_RA_PREFERENCE,
  45         IFACE_ATTR_RA_ADVROUTER,
  46         IFACE_ATTR_RA_MAXINTERVAL,
  47         IFACE_ATTR_PD_MANAGER,
  48         IFACE_ATTR_PD_CER,
  49         IFACE_ATTR_NDPROXY_ROUTING,
  50         IFACE_ATTR_NDPROXY_SLAVE,
  51         IFACE_ATTR_MAX
  52 };
  53
  54 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  55         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  57         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  60         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  62         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  63         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  70         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  71         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  72         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  77         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  78         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  79         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  81         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  82         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  83         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  84 };
  85
  86 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  87         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  90 };
  91
  92 const struct uci_blob_param_list interface_attr_list = {
  93         .n_params = IFACE_ATTR_MAX,
  94         .params = iface_attrs,
  95         .info = iface_attr_info,
  96 };
  97
  98
  99 enum {
 100         LEASE_ATTR_IP,
 101         LEASE_ATTR_MAC,
 102         LEASE_ATTR_DUID,
 103         LEASE_ATTR_HOSTID,
 104         LEASE_ATTR_LEASETIME,
 105         LEASE_ATTR_NAME,
 106         LEASE_ATTR_MAX
 107 };
 108
 109
 110 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 111         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 112         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 113         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 114         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 115         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 116         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 117 };
 118
 119
 120 const struct uci_blob_param_list lease_attr_list = {
 121         .n_params = LEASE_ATTR_MAX,
 122         .params = lease_attrs,
 123 };
 124
 125
 126 enum {
 127         ODHCPD_ATTR_MAINDHCP,
 128         ODHCPD_ATTR_LEASEFILE,
 129         ODHCPD_ATTR_LEASETRIGGER,
 130         ODHCPD_ATTR_MAX
 131 };
 132
 133
 134 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 135         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 136         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 137         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 138 };
 139
 140
 141 const struct uci_blob_param_list odhcpd_attr_list = {
 142         .n_params = ODHCPD_ATTR_MAX,
 143         .params = odhcpd_attrs,
 144 };
 145
 146 static int mkdir_p(char *dir, mode_t mask)
 147 {
 148         char *l = strrchr(dir, '/');
 149         int ret;
 150
 151         if (!l)
 152                 return 0;
 153
 154         *l = '\0';
 155
 156         if (mkdir_p(dir, mask))
 157                 return -1;
 158
 159         *l = '/';
 160
 161         ret = mkdir(dir, mask);
 162         if (ret && errno == EEXIST)
 163                 return 0;
 164
 165         if (ret)
 166                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 167
 168         return ret;
 169 }
 170
 171 static struct interface* get_interface(const char *name)
 172 {
 173         struct interface *c;
 174         list_for_each_entry(c, &interfaces, head)
 175                 if (!strcmp(c->name, name))
 176                         return c;
 177         return NULL;
 178 }
 179
 180
 181 static void clean_interface(struct interface *iface)
 182 {
 183         free(iface->dns);
 184         free(iface->search);
 185         free(iface->upstream);
 186         free(iface->dhcpv4_router);
 187         free(iface->dhcpv4_dns);
 188         free(iface->dhcpv6_raw);
 189         free(iface->filter_class);
 190         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 191 }
 192
 193
 194 static void close_interface(struct interface *iface)
 195 {
 196         if (iface->head.next)
 197                 list_del(&iface->head);
 198
 199         setup_router_interface(iface, false);
 200         setup_dhcpv6_interface(iface, false);
 201         setup_ndp_interface(iface, false);
 202         setup_dhcpv4_interface(iface, false);
 203
 204         clean_interface(iface);
 205         free(iface);
 206 }
 207
 208
 209 static int parse_mode(const char *mode)
 210 {
 211         if (!strcmp(mode, "disabled")) {
 212                 return RELAYD_DISABLED;
 213         } else if (!strcmp(mode, "server")) {
 214                 return RELAYD_SERVER;
 215         } else if (!strcmp(mode, "relay")) {
 216                 return RELAYD_RELAY;
 217         } else if (!strcmp(mode, "hybrid")) {
 218                 return RELAYD_HYBRID;
 219         } else {
 220                 return -1;
 221         }
 222 }
 223
 224
 225 static void set_config(struct uci_section *s)
 226 {
 227         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 228
 229         blob_buf_init(&b, 0);
 230         uci_to_blob(&b, s, &odhcpd_attr_list);
 231         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 232
 233         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 234                 config.legacy = blobmsg_get_bool(c);
 235
 236         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 237                 free(config.dhcp_statefile);
 238                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 239         }
 240
 241         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 242                 free(config.dhcp_cb);
 243                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 244         }
 245 }
 246
 247 static double parse_leasetime(struct blob_attr *c) {
 248         char *val = blobmsg_get_string(c), *endptr = NULL;
 249         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 250
 251         if (time && endptr && endptr[0]) {
 252                 if (endptr[0] == 's')
 253                         time *= 1;
 254                 else if (endptr[0] == 'm')
 255                         time *= 60;
 256                 else if (endptr[0] == 'h')
 257                         time *= 3600;
 258                 else if (endptr[0] == 'd')
 259                         time *= 24 * 3600;
 260                 else if (endptr[0] == 'w')
 261                         time *= 7 * 24 * 3600;
 262                 else
 263                         goto err;
 264         }
 265
 266         if (time >= 60)
 267                 return time;
 268
 269         return 0;
 270
 271 err:
 272         return -1;
 273 }
 274
 275 static int set_lease(struct uci_section *s)
 276 {
 277         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 278
 279         blob_buf_init(&b, 0);
 280         uci_to_blob(&b, s, &lease_attr_list);
 281         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 282
 283         size_t hostlen = 1;
 284         if ((c = tb[LEASE_ATTR_NAME]))
 285                 hostlen = blobmsg_data_len(c);
 286
 287         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 288         if (!lease)
 289                 goto err;
 290
 291         if (hostlen > 1)
 292                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 293
 294         if ((c = tb[LEASE_ATTR_IP]))
 295                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 296                         goto err;
 297
 298         if ((c = tb[LEASE_ATTR_MAC]))
 299                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 300                         goto err;
 301
 302         if ((c = tb[LEASE_ATTR_DUID])) {
 303                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 304                 lease->duid = malloc(duidlen);
 305                 if (!lease->duid)
 306                         goto err;
 307
 308                 ssize_t len = odhcpd_unhexlify(lease->duid,
 309                                 duidlen, blobmsg_get_string(c));
 310
 311                 if (len < 0)
 312                         goto err;
 313
 314                 lease->duid_len = len;
 315         }
 316
 317         if ((c = tb[LEASE_ATTR_HOSTID])) {
 318                 errno = 0;
 319                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 320                 if (errno)
 321                         goto err;
 322         }
 323
 324         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 325                 double time = parse_leasetime(c);
 326                 if (time < 0)
 327                         goto err;
 328
 329                 if (time >= 60)
 330                         lease->dhcpv4_leasetime = time;
 331         }
 332
 333         list_add(&lease->head, &leases);
 334         return 0;
 335
 336 err:
 337         if (lease) {
 338                 free(lease->duid);
 339                 free(lease);
 340         }
 341         return -1;
 342 }
 343
 344
 345 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 346 {
 347         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 348         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 349
 350         if (tb[IFACE_ATTR_INTERFACE])
 351                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 352
 353         if (!name)
 354                 return -1;
 355
 356         struct interface *iface = get_interface(name);
 357         if (!iface) {
 358                 iface = calloc(1, sizeof(*iface));
 359                 if (!iface)
 360                         return -1;
 361
 362                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 363
 364                 /* Default settings */
 365                 iface->managed = 1;
 366                 iface->learn_routes = true;
 367
 368                 list_add(&iface->head, &interfaces);
 369                 overwrite = true;
 370         }
 371
 372         const char *ifname = NULL;
 373         if (overwrite) {
 374                 if ((c = tb[IFACE_ATTR_IFNAME]))
 375                         ifname = blobmsg_get_string(c);
 376                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 377                         ifname = blobmsg_get_string(c);
 378         }
 379
 380 #ifdef WITH_UBUS
 381         if (overwrite || !iface->ifname[0])
 382                 ifname = ubus_get_ifname(name);
 383 #endif
 384
 385         if (!iface->ifname[0] && !ifname)
 386                 goto err;
 387
 388         if (ifname)
 389                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 390
 391         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 392                 goto err;
 393
 394         iface->inuse = true;
 395
 396         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 397                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 398
 399         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 400                 iface->ignore = blobmsg_get_bool(c);
 401
 402         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 403                 double time = parse_leasetime(c);
 404                 if (time < 0)
 405                         goto err;
 406
 407                 if (time >= 60)
 408                         iface->dhcpv4_leasetime = time;
 409         }
 410
 411         if ((c = tb[IFACE_ATTR_START])) {
 412                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 413
 414                 if (config.legacy)
 415                         iface->dhcpv4 = RELAYD_SERVER;
 416         }
 417
 418         if ((c = tb[IFACE_ATTR_LIMIT]))
 419                 iface->dhcpv4_end.s_addr = htonl(
 420                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 421
 422         if ((c = tb[IFACE_ATTR_MASTER]))
 423                 iface->master = blobmsg_get_bool(c);
 424
 425         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 426                 struct blob_attr *cur;
 427                 unsigned rem;
 428
 429                 blobmsg_for_each_attr(cur, c, rem) {
 430                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 431                                 continue;
 432
 433                         iface->upstream = realloc(iface->upstream,
 434                                         iface->upstream_len + blobmsg_data_len(cur));
 435                         if (!iface->upstream)
 436                                 goto err;
 437
 438                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 439                         iface->upstream_len += blobmsg_data_len(cur);
 440                 }
 441         }
 442
 443         int mode;
 444         if ((c = tb[IFACE_ATTR_RA])) {
 445                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 446                         iface->ra = mode;
 447                 else
 448                         goto err;
 449         }
 450
 451         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 452                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 453                         iface->dhcpv4 = mode;
 454                 else
 455                         goto err;
 456         }
 457
 458         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 459                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 460                         iface->dhcpv6 = mode;
 461                 else
 462                         goto err;
 463         }
 464
 465         if ((c = tb[IFACE_ATTR_NDP])) {
 466                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 467                         iface->ndp = mode;
 468                 else
 469                         goto err;
 470         }
 471
 472         if ((c = tb[IFACE_ATTR_ROUTER])) {
 473                 struct blob_attr *cur;
 474                 unsigned rem;
 475
 476                 blobmsg_for_each_attr(cur, c, rem) {
 477                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 478                                 continue;
 479
 480                         struct in_addr addr4;
 481                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 482                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 483                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 484                                 if (!iface->dhcpv4_router)
 485                                         goto err;
 486
 487                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 488                         } else {
 489                                 goto err;
 490                         }
 491                 }
 492         }
 493
 494         if ((c = tb[IFACE_ATTR_DNS])) {
 495                 struct blob_attr *cur;
 496                 unsigned rem;
 497
 498                 iface->always_rewrite_dns = true;
 499                 blobmsg_for_each_attr(cur, c, rem) {
 500                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 501                                 continue;
 502
 503                         struct in_addr addr4;
 504                         struct in6_addr addr6;
 505                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 506                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 507                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 508                                 if (!iface->dhcpv4_dns)
 509                                         goto err;
 510
 511                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 512                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 513                                 iface->dns = realloc(iface->dns,
 514                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 515                                 if (!iface->dns)
 516                                         goto err;
 517
 518                                 iface->dns[iface->dns_cnt - 1] = addr6;
 519                         } else {
 520                                 goto err;
 521                         }
 522                 }
 523         }
 524
 525         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 526                 struct blob_attr *cur;
 527                 unsigned rem;
 528
 529                 blobmsg_for_each_attr(cur, c, rem) {
 530                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 531                                 continue;
 532
 533                         uint8_t buf[256];
 534                         char *domain = blobmsg_get_string(cur);
 535                         size_t domainlen = strlen(domain);
 536                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 537                                 domain[domainlen - 1] = 0;
 538
 539                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 540                         if (len <= 0)
 541                                 goto err;
 542
 543                         iface->search = realloc(iface->search, iface->search_len + len);
 544                         if (!iface->search)
 545                                 goto err;
 546
 547                         memcpy(&iface->search[iface->search_len], buf, len);
 548                         iface->search_len += len;
 549                 }
 550         }
 551
 552         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 553                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 554                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 555         }
 556
 557         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 558                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 559                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 560                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 561         }
 562
 563         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 564                 iface->default_router = blobmsg_get_u32(c);
 565
 566         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 567                 iface->managed = blobmsg_get_u32(c);
 568
 569         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 570                 iface->ra_not_onlink = blobmsg_get_bool(c);
 571
 572         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 573                 iface->ra_advrouter = blobmsg_get_bool(c);
 574
 575         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 576                 iface->ra_maxinterval = blobmsg_get_u32(c);
 577
 578         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 579                 const char *prio = blobmsg_get_string(c);
 580
 581                 if (!strcmp(prio, "high"))
 582                         iface->route_preference = 1;
 583                 else if (!strcmp(prio, "low"))
 584                         iface->route_preference = -1;
 585                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 586                         iface->route_preference = 0;
 587                 else
 588                         goto err;
 589         }
 590
 591         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 592                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 593                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 594
 595         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 596                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 597                 goto err;
 598
 599         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 600                 iface->learn_routes = blobmsg_get_bool(c);
 601
 602         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 603                 iface->external = blobmsg_get_bool(c);
 604
 605         return 0;
 606
 607 err:
 608         close_interface(iface);
 609         return -1;
 610 }
 611
 612 static int set_interface(struct uci_section *s)
 613 {
 614         blob_buf_init(&b, 0);
 615         uci_to_blob(&b, s, &interface_attr_list);
 616         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 617 }
 618
 619
 620 void odhcpd_reload(void)
 621 {
 622         struct uci_context *uci = uci_alloc_context();
 623         while (!list_empty(&leases)) {
 624                 struct lease *l = list_first_entry(&leases, struct lease, head);
 625                 list_del(&l->head);
 626                 free(l->duid);
 627                 free(l);
 628         }
 629
 630         struct interface *master = NULL, *i, *n;
 631
 632         if (!uci)
 633                 return;
 634
 635         list_for_each_entry(i, &interfaces, head)
 636                 clean_interface(i);
 637
 638         struct uci_package *dhcp = NULL;
 639         if (!uci_load(uci, "dhcp", &dhcp)) {
 640                 struct uci_element *e;
 641                 uci_foreach_element(&dhcp->sections, e) {
 642                         struct uci_section *s = uci_to_section(e);
 643                         if (!strcmp(s->type, "host"))
 644                                 set_lease(s);
 645                         else if (!strcmp(s->type, "odhcpd"))
 646                                 set_config(s);
 647                 }
 648
 649                 uci_foreach_element(&dhcp->sections, e) {
 650                         struct uci_section *s = uci_to_section(e);
 651                         if (!strcmp(s->type, "dhcp"))
 652                                 set_interface(s);
 653                 }
 654         }
 655
 656         if (config.dhcp_statefile) {
 657                 char *path = strdup(config.dhcp_statefile);
 658
 659                 mkdir_p(dirname(path), 0755);
 660                 free(path);
 661         }
 662
 663 #ifdef WITH_UBUS
 664         ubus_apply_network();
 665 #endif
 666
 667         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 668
 669         // Test for
 670         list_for_each_entry(i, &interfaces, head) {
 671                 if (i->master)
 672                         continue;
 673
 674                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 675                         any_dhcpv6_slave = true;
 676
 677                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 678                         any_ra_slave = true;
 679
 680                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 681                         any_ndp_slave = true;
 682         }
 683
 684         // Evaluate hybrid mode for master
 685         list_for_each_entry(i, &interfaces, head) {
 686                 if (!i->master)
 687                         continue;
 688
 689                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 690 #ifdef WITH_UBUS
 691                 if (!ubus_has_prefix(i->name, i->ifname))
 692                         hybrid_mode = RELAYD_RELAY;
 693 #endif
 694
 695                 if (i->dhcpv6 == RELAYD_HYBRID)
 696                         i->dhcpv6 = hybrid_mode;
 697
 698                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 699                         i->dhcpv6 = RELAYD_DISABLED;
 700
 701                 if (i->ra == RELAYD_HYBRID)
 702                         i->ra = hybrid_mode;
 703
 704                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 705                         i->ra = RELAYD_DISABLED;
 706
 707                 if (i->ndp == RELAYD_HYBRID)
 708                         i->ndp = hybrid_mode;
 709
 710                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 711                         i->ndp = RELAYD_DISABLED;
 712
 713                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 714                         master = i;
 715         }
 716
 717
 718         list_for_each_entry_safe(i, n, &interfaces, head) {
 719                 if (i->inuse) {
 720                         // Resolve hybrid mode
 721                         if (i->dhcpv6 == RELAYD_HYBRID)
 722                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 723                                                 RELAYD_RELAY : RELAYD_SERVER;
 724
 725                         if (i->ra == RELAYD_HYBRID)
 726                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 727                                                 RELAYD_RELAY : RELAYD_SERVER;
 728
 729                         if (i->ndp == RELAYD_HYBRID)
 730                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 731                                                 RELAYD_RELAY : RELAYD_DISABLED;
 732
 733                         setup_router_interface(i, true);
 734                         setup_dhcpv6_interface(i, true);
 735                         setup_ndp_interface(i, true);
 736                         setup_dhcpv4_interface(i, true);
 737                 } else {
 738                         close_interface(i);
 739                 }
 740         }
 741
 742         uci_unload(uci, dhcp);
 743         uci_free_context(uci);
 744 }
 745
 746
 747 static void handle_signal(int signal)
 748 {
 749         char b[1] = {0};
 750
 751         if (signal == SIGHUP) {
 752                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 753         } else
 754                 uloop_end();
 755 }
 756
 757
 758
 759 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 760 {
 761         char b[512];
 762         if (read(u->fd, b, sizeof(b)) < 0) {}
 763         odhcpd_reload();
 764 }
 765
 766 static struct uloop_fd reload_fd = { .cb = reload_cb };
 767
 768 void odhcpd_run(void)
 769 {
 770         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 771         reload_fd.fd = reload_pipe[0];
 772         uloop_fd_add(&reload_fd, ULOOP_READ);
 773
 774         signal(SIGTERM, handle_signal);
 775         signal(SIGINT, handle_signal);
 776         signal(SIGHUP, handle_signal);
 777
 778 #ifdef WITH_UBUS
 779         while (init_ubus())
 780                 sleep(1);
 781 #endif
 782
 783         odhcpd_reload();
 784         uloop_run();
 785
 786         while (!list_empty(&interfaces))
 787                 close_interface(list_first_entry(&interfaces, struct interface, head));
 788 }
 789