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 #include <syslog.h>
  10
  11 #include <uci.h>
  12 #include <uci_blob.h>
  13
  14 #include "odhcpd.h"
  15
  16 static struct blob_buf b;
  17 static int reload_pipe[2];
  18 struct list_head leases = LIST_HEAD_INIT(leases);
  19 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  20 struct config config = {.legacy = false, .dhcp_cb = NULL,
  21                         .dhcp_statefile = NULL, .log_level = LOG_INFO};
  22
  23 enum {
  24         IFACE_ATTR_INTERFACE,
  25         IFACE_ATTR_IFNAME,
  26         IFACE_ATTR_NETWORKID,
  27         IFACE_ATTR_DYNAMICDHCP,
  28         IFACE_ATTR_IGNORE,
  29         IFACE_ATTR_LEASETIME,
  30         IFACE_ATTR_LIMIT,
  31         IFACE_ATTR_START,
  32         IFACE_ATTR_MASTER,
  33         IFACE_ATTR_UPSTREAM,
  34         IFACE_ATTR_RA,
  35         IFACE_ATTR_DHCPV4,
  36         IFACE_ATTR_DHCPV6,
  37         IFACE_ATTR_NDP,
  38         IFACE_ATTR_ROUTER,
  39         IFACE_ATTR_DNS,
  40         IFACE_ATTR_DOMAIN,
  41         IFACE_ATTR_FILTER_CLASS,
  42         IFACE_ATTR_DHCPV6_RAW,
  43         IFACE_ATTR_RA_DEFAULT,
  44         IFACE_ATTR_RA_MANAGEMENT,
  45         IFACE_ATTR_RA_OFFLINK,
  46         IFACE_ATTR_RA_PREFERENCE,
  47         IFACE_ATTR_RA_ADVROUTER,
  48         IFACE_ATTR_RA_MININTERVAL,
  49         IFACE_ATTR_RA_MAXINTERVAL,
  50         IFACE_ATTR_RA_LIFETIME,
  51         IFACE_ATTR_PD_MANAGER,
  52         IFACE_ATTR_PD_CER,
  53         IFACE_ATTR_NDPROXY_ROUTING,
  54         IFACE_ATTR_NDPROXY_SLAVE,
  55         IFACE_ATTR_MAX
  56 };
  57
  58 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  59         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  63         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  66         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  67         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  68         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  69         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  74         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  75         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  76         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  81         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  82         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  83         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  85         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  86         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  87         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  88         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  90 };
  91
  92 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  93         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  96 };
  97
  98 const struct uci_blob_param_list interface_attr_list = {
  99         .n_params = IFACE_ATTR_MAX,
 100         .params = iface_attrs,
 101         .info = iface_attr_info,
 102 };
 103
 104 enum {
 105         LEASE_ATTR_IP,
 106         LEASE_ATTR_MAC,
 107         LEASE_ATTR_DUID,
 108         LEASE_ATTR_HOSTID,
 109         LEASE_ATTR_LEASETIME,
 110         LEASE_ATTR_NAME,
 111         LEASE_ATTR_MAX
 112 };
 113
 114 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 115         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 116         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 117         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 118         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 119         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 120         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 121 };
 122
 123 const struct uci_blob_param_list lease_attr_list = {
 124         .n_params = LEASE_ATTR_MAX,
 125         .params = lease_attrs,
 126 };
 127
 128 enum {
 129         ODHCPD_ATTR_MAINDHCP,
 130         ODHCPD_ATTR_LEASEFILE,
 131         ODHCPD_ATTR_LEASETRIGGER,
 132         ODHCPD_ATTR_LOGLEVEL,
 133         ODHCPD_ATTR_MAX
 134 };
 135
 136 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 137         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 138         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 139         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 140         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 141 };
 142
 143 const struct uci_blob_param_list odhcpd_attr_list = {
 144         .n_params = ODHCPD_ATTR_MAX,
 145         .params = odhcpd_attrs,
 146 };
 147
 148 static int mkdir_p(char *dir, mode_t mask)
 149 {
 150         char *l = strrchr(dir, '/');
 151         int ret;
 152
 153         if (!l)
 154                 return 0;
 155
 156         *l = '\0';
 157
 158         if (mkdir_p(dir, mask))
 159                 return -1;
 160
 161         *l = '/';
 162
 163         ret = mkdir(dir, mask);
 164         if (ret && errno == EEXIST)
 165                 return 0;
 166
 167         if (ret)
 168                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 169
 170         return ret;
 171 }
 172
 173 static void free_lease(struct lease *l)
 174 {
 175         if (l->head.next)
 176                 list_del(&l->head);
 177
 178         free(l->duid);
 179         free(l);
 180 }
 181
 182 static struct interface* get_interface(const char *name)
 183 {
 184         struct interface *c;
 185         list_for_each_entry(c, &interfaces, head)
 186                 if (!strcmp(c->name, name))
 187                         return c;
 188         return NULL;
 189 }
 190
 191 static void set_interface_defaults(struct interface *iface)
 192 {
 193         iface->managed = 1;
 194         iface->learn_routes = 1;
 195         iface->ra_maxinterval = 600;
 196         iface->ra_mininterval = iface->ra_maxinterval/3;
 197         iface->ra_lifetime = -1;
 198 }
 199
 200 static void clean_interface(struct interface *iface)
 201 {
 202         free(iface->dns);
 203         free(iface->search);
 204         free(iface->upstream);
 205         free(iface->dhcpv4_router);
 206         free(iface->dhcpv4_dns);
 207         free(iface->dhcpv6_raw);
 208         free(iface->filter_class);
 209         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 210         set_interface_defaults(iface);
 211 }
 212
 213 static void close_interface(struct interface *iface)
 214 {
 215         if (iface->head.next)
 216                 list_del(&iface->head);
 217
 218         setup_router_interface(iface, false);
 219         setup_dhcpv6_interface(iface, false);
 220         setup_ndp_interface(iface, false);
 221         setup_dhcpv4_interface(iface, false);
 222
 223         clean_interface(iface);
 224         free(iface);
 225 }
 226
 227 static int parse_mode(const char *mode)
 228 {
 229         if (!strcmp(mode, "disabled"))
 230                 return RELAYD_DISABLED;
 231         else if (!strcmp(mode, "server"))
 232                 return RELAYD_SERVER;
 233         else if (!strcmp(mode, "relay"))
 234                 return RELAYD_RELAY;
 235         else if (!strcmp(mode, "hybrid"))
 236                 return RELAYD_HYBRID;
 237         else
 238                 return -1;
 239 }
 240
 241 static void set_config(struct uci_section *s)
 242 {
 243         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 244
 245         blob_buf_init(&b, 0);
 246         uci_to_blob(&b, s, &odhcpd_attr_list);
 247         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 248
 249         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 250                 config.legacy = blobmsg_get_bool(c);
 251
 252         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 253                 free(config.dhcp_statefile);
 254                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 255         }
 256
 257         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 258                 free(config.dhcp_cb);
 259                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 260         }
 261
 262         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 263                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 264
 265                 if (config.log_level != log_level) {
 266                         config.log_level = log_level;
 267                         setlogmask(LOG_UPTO(config.log_level));
 268                 }
 269         }
 270 }
 271
 272 static double parse_leasetime(struct blob_attr *c) {
 273         char *val = blobmsg_get_string(c), *endptr = NULL;
 274         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 275
 276         if (time && endptr && endptr[0]) {
 277                 if (endptr[0] == 's')
 278                         time *= 1;
 279                 else if (endptr[0] == 'm')
 280                         time *= 60;
 281                 else if (endptr[0] == 'h')
 282                         time *= 3600;
 283                 else if (endptr[0] == 'd')
 284                         time *= 24 * 3600;
 285                 else if (endptr[0] == 'w')
 286                         time *= 7 * 24 * 3600;
 287                 else
 288                         goto err;
 289         }
 290
 291         if (time >= 60)
 292                 return time;
 293
 294         return 0;
 295
 296 err:
 297         return -1;
 298 }
 299
 300 static int set_lease(struct uci_section *s)
 301 {
 302         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 303
 304         blob_buf_init(&b, 0);
 305         uci_to_blob(&b, s, &lease_attr_list);
 306         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 307
 308         size_t hostlen = 1;
 309         if ((c = tb[LEASE_ATTR_NAME]))
 310                 hostlen = blobmsg_data_len(c);
 311
 312         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 313         if (!lease)
 314                 goto err;
 315
 316         if (hostlen > 1)
 317                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 318
 319         if ((c = tb[LEASE_ATTR_IP]))
 320                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 321                         goto err;
 322
 323         if ((c = tb[LEASE_ATTR_MAC]))
 324                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 325                         goto err;
 326
 327         if ((c = tb[LEASE_ATTR_DUID])) {
 328                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 329                 lease->duid = malloc(duidlen);
 330                 if (!lease->duid)
 331                         goto err;
 332
 333                 ssize_t len = odhcpd_unhexlify(lease->duid,
 334                                 duidlen, blobmsg_get_string(c));
 335
 336                 if (len < 0)
 337                         goto err;
 338
 339                 lease->duid_len = len;
 340         }
 341
 342         if ((c = tb[LEASE_ATTR_HOSTID])) {
 343                 errno = 0;
 344                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 345                 if (errno)
 346                         goto err;
 347         }
 348
 349         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 350                 double time = parse_leasetime(c);
 351                 if (time < 0)
 352                         goto err;
 353
 354                 if (time >= 60)
 355                         lease->dhcpv4_leasetime = time;
 356         }
 357
 358         list_add(&lease->head, &leases);
 359         return 0;
 360
 361 err:
 362         if (lease)
 363                 free_lease(lease);
 364
 365         return -1;
 366 }
 367
 368 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 369 {
 370         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 371         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 372
 373         if (tb[IFACE_ATTR_INTERFACE])
 374                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 375
 376         if (!name)
 377                 return -1;
 378
 379         struct interface *iface = get_interface(name);
 380         if (!iface) {
 381                 iface = calloc(1, sizeof(*iface));
 382                 if (!iface)
 383                         return -1;
 384
 385                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 386
 387                 set_interface_defaults(iface);
 388
 389                 list_add(&iface->head, &interfaces);
 390                 overwrite = true;
 391         }
 392
 393         const char *ifname = NULL;
 394         if (overwrite) {
 395                 if ((c = tb[IFACE_ATTR_IFNAME]))
 396                         ifname = blobmsg_get_string(c);
 397                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 398                         ifname = blobmsg_get_string(c);
 399         }
 400
 401 #ifdef WITH_UBUS
 402         if (overwrite || !iface->ifname[0])
 403                 ifname = ubus_get_ifname(name);
 404 #endif
 405
 406         if (!iface->ifname[0] && !ifname)
 407                 goto err;
 408
 409         if (ifname)
 410                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 411
 412         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 413                 goto err;
 414
 415         iface->inuse = true;
 416
 417         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 418                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 419
 420         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 421                 iface->ignore = blobmsg_get_bool(c);
 422
 423         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 424                 double time = parse_leasetime(c);
 425                 if (time < 0)
 426                         goto err;
 427
 428                 if (time >= 60)
 429                         iface->dhcpv4_leasetime = time;
 430         }
 431
 432         if ((c = tb[IFACE_ATTR_START])) {
 433                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 434
 435                 if (config.legacy)
 436                         iface->dhcpv4 = RELAYD_SERVER;
 437         }
 438
 439         if ((c = tb[IFACE_ATTR_LIMIT]))
 440                 iface->dhcpv4_end.s_addr = htonl(
 441                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 442
 443         if ((c = tb[IFACE_ATTR_MASTER]))
 444                 iface->master = blobmsg_get_bool(c);
 445
 446         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 447                 struct blob_attr *cur;
 448                 unsigned rem;
 449
 450                 blobmsg_for_each_attr(cur, c, rem) {
 451                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 452                                 continue;
 453
 454                         iface->upstream = realloc(iface->upstream,
 455                                         iface->upstream_len + blobmsg_data_len(cur));
 456                         if (!iface->upstream)
 457                                 goto err;
 458
 459                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 460                         iface->upstream_len += blobmsg_data_len(cur);
 461                 }
 462         }
 463
 464         int mode;
 465         if ((c = tb[IFACE_ATTR_RA])) {
 466                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 467                         iface->ra = mode;
 468                 else
 469                         goto err;
 470         }
 471
 472         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 473                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 474                         iface->dhcpv4 = mode;
 475                 else
 476                         goto err;
 477         }
 478
 479         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 480                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 481                         iface->dhcpv6 = mode;
 482                 else
 483                         goto err;
 484         }
 485
 486         if ((c = tb[IFACE_ATTR_NDP])) {
 487                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 488                         iface->ndp = mode;
 489                 else
 490                         goto err;
 491         }
 492
 493         if ((c = tb[IFACE_ATTR_ROUTER])) {
 494                 struct blob_attr *cur;
 495                 unsigned rem;
 496
 497                 blobmsg_for_each_attr(cur, c, rem) {
 498                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 499                                 continue;
 500
 501                         struct in_addr addr4;
 502                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 503                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 504                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 505                                 if (!iface->dhcpv4_router)
 506                                         goto err;
 507
 508                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 509                         } else
 510                                 goto err;
 511                 }
 512         }
 513
 514         if ((c = tb[IFACE_ATTR_DNS])) {
 515                 struct blob_attr *cur;
 516                 unsigned rem;
 517
 518                 iface->always_rewrite_dns = true;
 519                 blobmsg_for_each_attr(cur, c, rem) {
 520                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 521                                 continue;
 522
 523                         struct in_addr addr4;
 524                         struct in6_addr addr6;
 525                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 526                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 527                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 528                                 if (!iface->dhcpv4_dns)
 529                                         goto err;
 530
 531                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 532                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 533                                 iface->dns = realloc(iface->dns,
 534                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 535                                 if (!iface->dns)
 536                                         goto err;
 537
 538                                 iface->dns[iface->dns_cnt - 1] = addr6;
 539                         } else
 540                                 goto err;
 541                 }
 542         }
 543
 544         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 545                 struct blob_attr *cur;
 546                 unsigned rem;
 547
 548                 blobmsg_for_each_attr(cur, c, rem) {
 549                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 550                                 continue;
 551
 552                         uint8_t buf[256];
 553                         char *domain = blobmsg_get_string(cur);
 554                         size_t domainlen = strlen(domain);
 555                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 556                                 domain[domainlen - 1] = 0;
 557
 558                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 559                         if (len <= 0)
 560                                 goto err;
 561
 562                         iface->search = realloc(iface->search, iface->search_len + len);
 563                         if (!iface->search)
 564                                 goto err;
 565
 566                         memcpy(&iface->search[iface->search_len], buf, len);
 567                         iface->search_len += len;
 568                 }
 569         }
 570
 571         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 572                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 573                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 574         }
 575
 576         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 577                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 578                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 579                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 580         }
 581
 582         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 583                 iface->default_router = blobmsg_get_u32(c);
 584
 585         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 586                 iface->managed = blobmsg_get_u32(c);
 587
 588         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 589                 iface->ra_not_onlink = blobmsg_get_bool(c);
 590
 591         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 592                 iface->ra_advrouter = blobmsg_get_bool(c);
 593
 594         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 595                 iface->ra_mininterval =  blobmsg_get_u32(c);
 596
 597         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 598                 iface->ra_maxinterval = blobmsg_get_u32(c);
 599
 600         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 601                 iface->ra_lifetime = blobmsg_get_u32(c);
 602
 603         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 604                 const char *prio = blobmsg_get_string(c);
 605
 606                 if (!strcmp(prio, "high"))
 607                         iface->route_preference = 1;
 608                 else if (!strcmp(prio, "low"))
 609                         iface->route_preference = -1;
 610                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 611                         iface->route_preference = 0;
 612                 else
 613                         goto err;
 614         }
 615
 616         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 617                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 618                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 619
 620         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 621                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 622                 goto err;
 623
 624         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 625                 iface->learn_routes = blobmsg_get_bool(c);
 626
 627         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 628                 iface->external = blobmsg_get_bool(c);
 629
 630         return 0;
 631
 632 err:
 633         close_interface(iface);
 634         return -1;
 635 }
 636
 637 static int set_interface(struct uci_section *s)
 638 {
 639         blob_buf_init(&b, 0);
 640         uci_to_blob(&b, s, &interface_attr_list);
 641
 642         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 643 }
 644
 645 void odhcpd_reload(void)
 646 {
 647         struct uci_context *uci = uci_alloc_context();
 648
 649         while (!list_empty(&leases))
 650                 free_lease(list_first_entry(&leases, struct lease, head));
 651
 652         struct interface *master = NULL, *i, *n;
 653
 654         if (!uci)
 655                 return;
 656
 657         list_for_each_entry(i, &interfaces, head)
 658                 clean_interface(i);
 659
 660         struct uci_package *dhcp = NULL;
 661         if (!uci_load(uci, "dhcp", &dhcp)) {
 662                 struct uci_element *e;
 663                 uci_foreach_element(&dhcp->sections, e) {
 664                         struct uci_section *s = uci_to_section(e);
 665                         if (!strcmp(s->type, "host"))
 666                                 set_lease(s);
 667                         else if (!strcmp(s->type, "odhcpd"))
 668                                 set_config(s);
 669                 }
 670
 671                 uci_foreach_element(&dhcp->sections, e) {
 672                         struct uci_section *s = uci_to_section(e);
 673                         if (!strcmp(s->type, "dhcp"))
 674                                 set_interface(s);
 675                 }
 676         }
 677
 678         if (config.dhcp_statefile) {
 679                 char *path = strdup(config.dhcp_statefile);
 680
 681                 mkdir_p(dirname(path), 0755);
 682                 free(path);
 683         }
 684
 685 #ifdef WITH_UBUS
 686         ubus_apply_network();
 687 #endif
 688
 689         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 690
 691         /* Test for */
 692         list_for_each_entry(i, &interfaces, head) {
 693                 if (i->master)
 694                         continue;
 695
 696                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 697                         any_dhcpv6_slave = true;
 698
 699                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 700                         any_ra_slave = true;
 701
 702                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 703                         any_ndp_slave = true;
 704         }
 705
 706         /* Evaluate hybrid mode for master */
 707         list_for_each_entry(i, &interfaces, head) {
 708                 if (!i->master)
 709                         continue;
 710
 711                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 712 #ifdef WITH_UBUS
 713                 if (!ubus_has_prefix(i->name, i->ifname))
 714                         hybrid_mode = RELAYD_RELAY;
 715 #endif
 716
 717                 if (i->dhcpv6 == RELAYD_HYBRID)
 718                         i->dhcpv6 = hybrid_mode;
 719
 720                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 721                         i->dhcpv6 = RELAYD_DISABLED;
 722
 723                 if (i->ra == RELAYD_HYBRID)
 724                         i->ra = hybrid_mode;
 725
 726                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 727                         i->ra = RELAYD_DISABLED;
 728
 729                 if (i->ndp == RELAYD_HYBRID)
 730                         i->ndp = hybrid_mode;
 731
 732                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 733                         i->ndp = RELAYD_DISABLED;
 734
 735                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 736                         master = i;
 737         }
 738
 739
 740         list_for_each_entry_safe(i, n, &interfaces, head) {
 741                 if (i->inuse) {
 742                         /* Resolve hybrid mode */
 743                         if (i->dhcpv6 == RELAYD_HYBRID)
 744                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 745                                                 RELAYD_RELAY : RELAYD_SERVER;
 746
 747                         if (i->ra == RELAYD_HYBRID)
 748                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 749                                                 RELAYD_RELAY : RELAYD_SERVER;
 750
 751                         if (i->ndp == RELAYD_HYBRID)
 752                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 753                                                 RELAYD_RELAY : RELAYD_DISABLED;
 754
 755                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 756                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 757                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 758                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 759                 } else {
 760                         close_interface(i);
 761                 }
 762         }
 763
 764         uci_unload(uci, dhcp);
 765         uci_free_context(uci);
 766 }
 767
 768 static void handle_signal(int signal)
 769 {
 770         char b[1] = {0};
 771
 772         if (signal == SIGHUP) {
 773                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 774         } else
 775                 uloop_end();
 776 }
 777
 778 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 779 {
 780         char b[512];
 781         if (read(u->fd, b, sizeof(b)) < 0) {}
 782
 783         odhcpd_reload();
 784 }
 785
 786 static struct uloop_fd reload_fd = { .cb = reload_cb };
 787
 788 void odhcpd_run(void)
 789 {
 790         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 791
 792         reload_fd.fd = reload_pipe[0];
 793         uloop_fd_add(&reload_fd, ULOOP_READ);
 794
 795         signal(SIGTERM, handle_signal);
 796         signal(SIGINT, handle_signal);
 797         signal(SIGHUP, handle_signal);
 798
 799 #ifdef WITH_UBUS
 800         while (init_ubus())
 801                 sleep(1);
 802 #endif
 803
 804         odhcpd_reload();
 805         uloop_run();
 806
 807         while (!list_empty(&interfaces))
 808                 close_interface(list_first_entry(&interfaces, struct interface, head));
 809 }
 810