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 <net/if.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <syslog.h>
  11
  12 #include <uci.h>
  13 #include <uci_blob.h>
  14 #include <libubox/utils.h>
  15 #include <libubox/avl.h>
  16 #include <libubox/avl-cmp.h>
  17
  18 #include "odhcpd.h"
  19
  20 static struct blob_buf b;
  21 static int reload_pipe[2];
  22 struct list_head leases = LIST_HEAD_INIT(leases);
  23 AVL_TREE(interfaces, avl_strcmp, false, NULL);
  24 struct config config = {.legacy = false, .main_dhcpv4 = false,
  25                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  26                         .log_level = LOG_INFO};
  27
  28 enum {
  29         IFACE_ATTR_INTERFACE,
  30         IFACE_ATTR_IFNAME,
  31         IFACE_ATTR_NETWORKID,
  32         IFACE_ATTR_DYNAMICDHCP,
  33         IFACE_ATTR_IGNORE,
  34         IFACE_ATTR_LEASETIME,
  35         IFACE_ATTR_LIMIT,
  36         IFACE_ATTR_START,
  37         IFACE_ATTR_MASTER,
  38         IFACE_ATTR_UPSTREAM,
  39         IFACE_ATTR_RA,
  40         IFACE_ATTR_DHCPV4,
  41         IFACE_ATTR_DHCPV6,
  42         IFACE_ATTR_NDP,
  43         IFACE_ATTR_ROUTER,
  44         IFACE_ATTR_DNS,
  45         IFACE_ATTR_DOMAIN,
  46         IFACE_ATTR_FILTER_CLASS,
  47         IFACE_ATTR_DHCPV4_FORCERECONF,
  48         IFACE_ATTR_DHCPV6_RAW,
  49         IFACE_ATTR_DHCPV6_ASSIGNALL,
  50         IFACE_ATTR_DHCPV6_PD,
  51         IFACE_ATTR_DHCPV6_NA,
  52         IFACE_ATTR_RA_DEFAULT,
  53         IFACE_ATTR_RA_MANAGEMENT,
  54         IFACE_ATTR_RA_OFFLINK,
  55         IFACE_ATTR_RA_PREFERENCE,
  56         IFACE_ATTR_RA_ADVROUTER,
  57         IFACE_ATTR_RA_MININTERVAL,
  58         IFACE_ATTR_RA_MAXINTERVAL,
  59         IFACE_ATTR_RA_LIFETIME,
  60         IFACE_ATTR_RA_USELEASETIME,
  61         IFACE_ATTR_RA_REACHABLETIME,
  62         IFACE_ATTR_RA_RETRANSTIME,
  63         IFACE_ATTR_RA_HOPLIMIT,
  64         IFACE_ATTR_RA_MTU,
  65         IFACE_ATTR_RA_DNS,
  66         IFACE_ATTR_PD_MANAGER,
  67         IFACE_ATTR_PD_CER,
  68         IFACE_ATTR_NDPROXY_ROUTING,
  69         IFACE_ATTR_NDPROXY_SLAVE,
  70         IFACE_ATTR_PREFIX_FILTER,
  71         IFACE_ATTR_MAX
  72 };
  73
  74 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  75         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  79         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  80         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  82         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  83         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  84         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  85         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  90         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  91         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  92         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  96         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
  97         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
  98         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 100         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 102         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 103         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 104         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 105         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 106         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 107         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 108         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 109         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 110         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 111         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 112         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 113         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 114         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 115         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 116         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 117 };
 118
 119 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 120         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 121         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 122         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 123 };
 124
 125 const struct uci_blob_param_list interface_attr_list = {
 126         .n_params = IFACE_ATTR_MAX,
 127         .params = iface_attrs,
 128         .info = iface_attr_info,
 129 };
 130
 131 enum {
 132         LEASE_ATTR_IP,
 133         LEASE_ATTR_MAC,
 134         LEASE_ATTR_DUID,
 135         LEASE_ATTR_HOSTID,
 136         LEASE_ATTR_LEASETIME,
 137         LEASE_ATTR_NAME,
 138         LEASE_ATTR_MAX
 139 };
 140
 141 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 142         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 143         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 144         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 145         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 146         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 147         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 148 };
 149
 150 const struct uci_blob_param_list lease_attr_list = {
 151         .n_params = LEASE_ATTR_MAX,
 152         .params = lease_attrs,
 153 };
 154
 155 enum {
 156         ODHCPD_ATTR_LEGACY,
 157         ODHCPD_ATTR_MAINDHCP,
 158         ODHCPD_ATTR_LEASEFILE,
 159         ODHCPD_ATTR_LEASETRIGGER,
 160         ODHCPD_ATTR_LOGLEVEL,
 161         ODHCPD_ATTR_MAX
 162 };
 163
 164 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 165         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 166         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 167         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 168         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 169         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 170 };
 171
 172 const struct uci_blob_param_list odhcpd_attr_list = {
 173         .n_params = ODHCPD_ATTR_MAX,
 174         .params = odhcpd_attrs,
 175 };
 176
 177 static int mkdir_p(char *dir, mode_t mask)
 178 {
 179         char *l = strrchr(dir, '/');
 180         int ret;
 181
 182         if (!l)
 183                 return 0;
 184
 185         *l = '\0';
 186
 187         if (mkdir_p(dir, mask))
 188                 return -1;
 189
 190         *l = '/';
 191
 192         ret = mkdir(dir, mask);
 193         if (ret && errno == EEXIST)
 194                 return 0;
 195
 196         if (ret)
 197                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 198
 199         return ret;
 200 }
 201
 202 static void free_lease(struct lease *l)
 203 {
 204         if (l->head.next)
 205                 list_del(&l->head);
 206
 207         free(l->duid);
 208         free(l);
 209 }
 210
 211 static void set_interface_defaults(struct interface *iface)
 212 {
 213         iface->learn_routes = 1;
 214         iface->dhcpv4_leasetime = 43200;
 215         iface->dhcpv6_assignall = true;
 216         iface->dhcpv6_pd = true;
 217         iface->dhcpv6_na = true;
 218         iface->ra_managed = RA_MANAGED_MFLAG;
 219         iface->ra_maxinterval = 600;
 220         iface->ra_mininterval = iface->ra_maxinterval/3;
 221         iface->ra_lifetime = -1;
 222         iface->ra_dns = true;
 223 }
 224
 225 static void clean_interface(struct interface *iface)
 226 {
 227         free(iface->dns);
 228         free(iface->search);
 229         free(iface->upstream);
 230         free(iface->dhcpv4_router);
 231         free(iface->dhcpv4_dns);
 232         free(iface->dhcpv6_raw);
 233         free(iface->filter_class);
 234         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 235         set_interface_defaults(iface);
 236 }
 237
 238 static void close_interface(struct interface *iface)
 239 {
 240         avl_delete(&interfaces, &iface->avl);
 241
 242         router_setup_interface(iface, false);
 243         dhcpv6_setup_interface(iface, false);
 244         ndp_setup_interface(iface, false);
 245 #ifdef DHCPV4_SUPPORT
 246         dhcpv4_setup_interface(iface, false);
 247 #endif
 248
 249         clean_interface(iface);
 250         free(iface->addr4);
 251         free(iface->addr6);
 252         free(iface->ifname);
 253         free(iface);
 254 }
 255
 256 static int parse_mode(const char *mode)
 257 {
 258         if (!strcmp(mode, "disabled"))
 259                 return MODE_DISABLED;
 260         else if (!strcmp(mode, "server"))
 261                 return MODE_SERVER;
 262         else if (!strcmp(mode, "relay"))
 263                 return MODE_RELAY;
 264         else if (!strcmp(mode, "hybrid"))
 265                 return MODE_HYBRID;
 266         else
 267                 return -1;
 268 }
 269
 270 static void set_config(struct uci_section *s)
 271 {
 272         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 273
 274         blob_buf_init(&b, 0);
 275         uci_to_blob(&b, s, &odhcpd_attr_list);
 276         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 277
 278         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 279                 config.legacy = blobmsg_get_bool(c);
 280
 281         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 282                 config.main_dhcpv4 = blobmsg_get_bool(c);
 283
 284         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 285                 free(config.dhcp_statefile);
 286                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 287         }
 288
 289         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 290                 free(config.dhcp_cb);
 291                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 292         }
 293
 294         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 295                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 296
 297                 if (config.log_level != log_level) {
 298                         config.log_level = log_level;
 299                         setlogmask(LOG_UPTO(config.log_level));
 300                 }
 301         }
 302 }
 303
 304 static double parse_leasetime(struct blob_attr *c) {
 305         char *val = blobmsg_get_string(c), *endptr = NULL;
 306         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 307
 308         if (time && endptr && endptr[0]) {
 309                 if (endptr[0] == 's')
 310                         time *= 1;
 311                 else if (endptr[0] == 'm')
 312                         time *= 60;
 313                 else if (endptr[0] == 'h')
 314                         time *= 3600;
 315                 else if (endptr[0] == 'd')
 316                         time *= 24 * 3600;
 317                 else if (endptr[0] == 'w')
 318                         time *= 7 * 24 * 3600;
 319                 else
 320                         goto err;
 321         }
 322
 323         if (time < 60)
 324                 time = 60;
 325
 326         return time;
 327
 328 err:
 329         return -1;
 330 }
 331
 332 static int set_lease(struct uci_section *s)
 333 {
 334         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 335
 336         blob_buf_init(&b, 0);
 337         uci_to_blob(&b, s, &lease_attr_list);
 338         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 339
 340         size_t hostlen = 1;
 341         if ((c = tb[LEASE_ATTR_NAME]))
 342                 hostlen = blobmsg_data_len(c);
 343
 344         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 345         if (!lease)
 346                 goto err;
 347
 348         if (hostlen > 1) {
 349                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 350                 if (!odhcpd_valid_hostname(lease->hostname))
 351                         goto err;
 352         }
 353
 354         if ((c = tb[LEASE_ATTR_IP]))
 355                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 356                         goto err;
 357
 358         if ((c = tb[LEASE_ATTR_MAC]))
 359                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 360                         goto err;
 361
 362         if ((c = tb[LEASE_ATTR_DUID])) {
 363                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 364                 lease->duid = malloc(duidlen);
 365                 if (!lease->duid)
 366                         goto err;
 367
 368                 ssize_t len = odhcpd_unhexlify(lease->duid,
 369                                 duidlen, blobmsg_get_string(c));
 370
 371                 if (len < 0)
 372                         goto err;
 373
 374                 lease->duid_len = len;
 375         }
 376
 377         if ((c = tb[LEASE_ATTR_HOSTID])) {
 378                 errno = 0;
 379                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 380                 if (errno)
 381                         goto err;
 382         }
 383
 384         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 385                 double time = parse_leasetime(c);
 386                 if (time < 0)
 387                         goto err;
 388
 389                 lease->dhcpv4_leasetime = time;
 390         }
 391
 392         list_add(&lease->head, &leases);
 393         return 0;
 394
 395 err:
 396         if (lease)
 397                 free_lease(lease);
 398
 399         return -1;
 400 }
 401
 402 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 403 {
 404         struct interface *iface;
 405         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 406         bool get_addrs = false;
 407
 408         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 409
 410         if (tb[IFACE_ATTR_INTERFACE])
 411                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 412
 413         if (!name)
 414                 return -1;
 415
 416         iface = avl_find_element(&interfaces, name, iface, avl);
 417         if (!iface) {
 418                 char *new_name;
 419
 420                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 421                 if (!iface)
 422                         return -1;
 423
 424                 iface->name = strcpy(new_name, name);
 425                 iface->avl.key = iface->name;
 426                 set_interface_defaults(iface);
 427
 428                 avl_insert(&interfaces, &iface->avl);
 429                 get_addrs = overwrite = true;
 430         }
 431
 432         const char *ifname = NULL;
 433         if (overwrite) {
 434                 if ((c = tb[IFACE_ATTR_IFNAME]))
 435                         ifname = blobmsg_get_string(c);
 436                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 437                         ifname = blobmsg_get_string(c);
 438         }
 439
 440 #ifdef WITH_UBUS
 441         if (overwrite || !iface->ifname)
 442                 ifname = ubus_get_ifname(name);
 443 #endif
 444
 445         if (!iface->ifname && !ifname)
 446                 goto err;
 447
 448         if (ifname) {
 449                 free(iface->ifname);
 450                 iface->ifname = strdup(ifname);
 451
 452                 if (!iface->ifname)
 453                         goto err;
 454
 455                 if (!iface->ifindex &&
 456                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 457                         goto err;
 458         }
 459
 460         if (get_addrs) {
 461                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 462                                                 true, &iface->addr6);
 463
 464                 if (len > 0)
 465                         iface->addr6_len = len;
 466
 467                 len = netlink_get_interface_addrs(iface->ifindex,
 468                                                 false, &iface->addr4);
 469                 if (len > 0)
 470                         iface->addr4_len = len;
 471         }
 472
 473         iface->inuse = true;
 474
 475         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 476                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 477
 478         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 479                 iface->ignore = blobmsg_get_bool(c);
 480
 481         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 482                 double time = parse_leasetime(c);
 483                 if (time < 0)
 484                         goto err;
 485
 486                 iface->dhcpv4_leasetime = time;
 487         }
 488
 489         if ((c = tb[IFACE_ATTR_START])) {
 490                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 491
 492                 if (config.main_dhcpv4 && config.legacy)
 493                         iface->dhcpv4 = MODE_SERVER;
 494         }
 495
 496         if ((c = tb[IFACE_ATTR_LIMIT]))
 497                 iface->dhcpv4_end.s_addr = htonl(
 498                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 499
 500         if ((c = tb[IFACE_ATTR_MASTER]))
 501                 iface->master = blobmsg_get_bool(c);
 502
 503         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 504                 struct blob_attr *cur;
 505                 unsigned rem;
 506
 507                 blobmsg_for_each_attr(cur, c, rem) {
 508                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 509                                 continue;
 510
 511                         iface->upstream = realloc(iface->upstream,
 512                                         iface->upstream_len + blobmsg_data_len(cur));
 513                         if (!iface->upstream)
 514                                 goto err;
 515
 516                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 517                         iface->upstream_len += blobmsg_data_len(cur);
 518                 }
 519         }
 520
 521         int mode;
 522         if ((c = tb[IFACE_ATTR_RA])) {
 523                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 524                         iface->ra = mode;
 525                 else
 526                         goto err;
 527         }
 528
 529         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 530                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 531                         if (config.main_dhcpv4)
 532                                 iface->dhcpv4 = mode;
 533                 }
 534                 else
 535                         goto err;
 536         }
 537
 538         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 539                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 540                         iface->dhcpv6 = mode;
 541                 else
 542                         goto err;
 543         }
 544
 545         if ((c = tb[IFACE_ATTR_NDP])) {
 546                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 547                         iface->ndp = mode;
 548                 else
 549                         goto err;
 550         }
 551
 552         if ((c = tb[IFACE_ATTR_ROUTER])) {
 553                 struct blob_attr *cur;
 554                 unsigned rem;
 555
 556                 blobmsg_for_each_attr(cur, c, rem) {
 557                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 558                                 continue;
 559
 560                         struct in_addr addr4;
 561                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 562                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 563                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 564                                 if (!iface->dhcpv4_router)
 565                                         goto err;
 566
 567                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 568                         } else
 569                                 goto err;
 570                 }
 571         }
 572
 573         if ((c = tb[IFACE_ATTR_DNS])) {
 574                 struct blob_attr *cur;
 575                 unsigned rem;
 576
 577                 iface->always_rewrite_dns = true;
 578                 blobmsg_for_each_attr(cur, c, rem) {
 579                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 580                                 continue;
 581
 582                         struct in_addr addr4;
 583                         struct in6_addr addr6;
 584                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 585                                 if (addr4.s_addr == INADDR_ANY)
 586                                         goto err;
 587
 588                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 589                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 590                                 if (!iface->dhcpv4_dns)
 591                                         goto err;
 592
 593                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 594                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 595                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 596                                         goto err;
 597
 598                                 iface->dns = realloc(iface->dns,
 599                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 600                                 if (!iface->dns)
 601                                         goto err;
 602
 603                                 iface->dns[iface->dns_cnt - 1] = addr6;
 604                         } else
 605                                 goto err;
 606                 }
 607         }
 608
 609         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 610                 struct blob_attr *cur;
 611                 unsigned rem;
 612
 613                 blobmsg_for_each_attr(cur, c, rem) {
 614                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 615                                 continue;
 616
 617                         uint8_t buf[256];
 618                         char *domain = blobmsg_get_string(cur);
 619                         size_t domainlen = strlen(domain);
 620                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 621                                 domain[domainlen - 1] = 0;
 622
 623                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 624                         if (len <= 0)
 625                                 goto err;
 626
 627                         iface->search = realloc(iface->search, iface->search_len + len);
 628                         if (!iface->search)
 629                                 goto err;
 630
 631                         memcpy(&iface->search[iface->search_len], buf, len);
 632                         iface->search_len += len;
 633                 }
 634         }
 635
 636         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 637                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 638                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 639         }
 640
 641         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 642                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 643
 644         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 645                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 646                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 647                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 648         }
 649
 650         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 651                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 652
 653         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 654                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 655
 656         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 657                 iface->dhcpv6_na = blobmsg_get_bool(c);
 658
 659         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 660                 iface->default_router = blobmsg_get_u32(c);
 661
 662         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 663                 iface->ra_managed = blobmsg_get_u32(c);
 664
 665         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 666                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 667                 if (ra_reachabletime > 3600000)
 668                         goto err;
 669
 670                 iface->ra_reachabletime = ra_reachabletime;
 671         }
 672
 673         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 674                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 675                 if (ra_retranstime > 60000)
 676                         goto err;
 677
 678                 iface->ra_retranstime = ra_retranstime;
 679         }
 680
 681         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 682                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 683                 if (ra_hoplimit > 255)
 684                         goto err;
 685
 686                 iface->ra_hoplimit = ra_hoplimit;
 687         }
 688
 689         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 690                 uint32_t ra_mtu = blobmsg_get_u32(c);
 691                 if (ra_mtu < 1280 || ra_mtu > 65535)
 692                         goto err;
 693
 694                 iface->ra_mtu = ra_mtu;
 695         }
 696
 697         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 698                 iface->ra_not_onlink = blobmsg_get_bool(c);
 699
 700         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 701                 iface->ra_advrouter = blobmsg_get_bool(c);
 702
 703         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 704                 iface->ra_mininterval =  blobmsg_get_u32(c);
 705
 706         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 707                 iface->ra_maxinterval = blobmsg_get_u32(c);
 708
 709         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 710                 iface->ra_lifetime = blobmsg_get_u32(c);
 711
 712         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 713                 iface->ra_useleasetime = blobmsg_get_bool(c);
 714
 715         if ((c = tb[IFACE_ATTR_RA_DNS]))
 716                 iface->ra_dns = blobmsg_get_bool(c);
 717
 718         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 719                 const char *prio = blobmsg_get_string(c);
 720
 721                 if (!strcmp(prio, "high"))
 722                         iface->route_preference = 1;
 723                 else if (!strcmp(prio, "low"))
 724                         iface->route_preference = -1;
 725                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 726                         iface->route_preference = 0;
 727                 else
 728                         goto err;
 729         }
 730
 731         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 732                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 733                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 734
 735         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 736                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 737                 goto err;
 738
 739         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 740                 iface->learn_routes = blobmsg_get_bool(c);
 741
 742         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 743                 iface->external = blobmsg_get_bool(c);
 744
 745         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 746                 const char *str = blobmsg_get_string(c);
 747                 char *astr = malloc(strlen(str) + 1);
 748                 char *delim;
 749                 int l;
 750
 751                 if (!astr || !strcpy(astr, str) ||
 752                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 753                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 754                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 755                         iface->pio_filter_length = 0;
 756                 else
 757                         iface->pio_filter_length = l;
 758
 759                 if (astr)
 760                         free(astr);
 761         }
 762
 763         return 0;
 764
 765 err:
 766         close_interface(iface);
 767         return -1;
 768 }
 769
 770 static int set_interface(struct uci_section *s)
 771 {
 772         blob_buf_init(&b, 0);
 773         uci_to_blob(&b, s, &interface_attr_list);
 774
 775         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 776 }
 777
 778 void odhcpd_reload(void)
 779 {
 780         struct uci_context *uci = uci_alloc_context();
 781         struct interface *master = NULL, *i, *tmp;
 782
 783         while (!list_empty(&leases))
 784                 free_lease(list_first_entry(&leases, struct lease, head));
 785
 786         if (!uci)
 787                 return;
 788
 789         avl_for_each_element(&interfaces, i, avl)
 790                 clean_interface(i);
 791
 792         struct uci_package *dhcp = NULL;
 793         if (!uci_load(uci, "dhcp", &dhcp)) {
 794                 struct uci_element *e;
 795                 uci_foreach_element(&dhcp->sections, e) {
 796                         struct uci_section *s = uci_to_section(e);
 797                         if (!strcmp(s->type, "host"))
 798                                 set_lease(s);
 799                         else if (!strcmp(s->type, "odhcpd"))
 800                                 set_config(s);
 801                 }
 802
 803                 uci_foreach_element(&dhcp->sections, e) {
 804                         struct uci_section *s = uci_to_section(e);
 805                         if (!strcmp(s->type, "dhcp"))
 806                                 set_interface(s);
 807                 }
 808         }
 809
 810         if (config.dhcp_statefile) {
 811                 char *path = strdup(config.dhcp_statefile);
 812
 813                 mkdir_p(dirname(path), 0755);
 814                 free(path);
 815         }
 816
 817 #ifdef WITH_UBUS
 818         ubus_apply_network();
 819 #endif
 820
 821         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 822
 823         /* Test for */
 824         avl_for_each_element(&interfaces, i, avl) {
 825                 if (i->master)
 826                         continue;
 827
 828                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 829                         any_dhcpv6_slave = true;
 830
 831                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 832                         any_ra_slave = true;
 833
 834                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 835                         any_ndp_slave = true;
 836         }
 837
 838         /* Evaluate hybrid mode for master */
 839         avl_for_each_element(&interfaces, i, avl) {
 840                 if (!i->master)
 841                         continue;
 842
 843                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 844 #ifdef WITH_UBUS
 845                 if (!ubus_has_prefix(i->name, i->ifname))
 846                         hybrid_mode = MODE_RELAY;
 847 #endif
 848
 849                 if (i->dhcpv6 == MODE_HYBRID)
 850                         i->dhcpv6 = hybrid_mode;
 851
 852                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 853                         i->dhcpv6 = MODE_DISABLED;
 854
 855                 if (i->ra == MODE_HYBRID)
 856                         i->ra = hybrid_mode;
 857
 858                 if (i->ra == MODE_RELAY && !any_ra_slave)
 859                         i->ra = MODE_DISABLED;
 860
 861                 if (i->ndp == MODE_HYBRID)
 862                         i->ndp = hybrid_mode;
 863
 864                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 865                         i->ndp = MODE_DISABLED;
 866
 867                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 868                         master = i;
 869         }
 870
 871
 872         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
 873                 if (i->inuse) {
 874                         /* Resolve hybrid mode */
 875                         if (i->dhcpv6 == MODE_HYBRID)
 876                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 877                                                 MODE_RELAY : MODE_SERVER;
 878
 879                         if (i->ra == MODE_HYBRID)
 880                                 i->ra = (master && master->ra == MODE_RELAY) ?
 881                                                 MODE_RELAY : MODE_SERVER;
 882
 883                         if (i->ndp == MODE_HYBRID)
 884                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 885                                                 MODE_RELAY : MODE_DISABLED;
 886
 887                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 888                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 889                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 890 #ifdef DHCPV4_SUPPORT
 891                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 892 #endif
 893                 } else
 894                         close_interface(i);
 895         }
 896
 897         uci_unload(uci, dhcp);
 898         uci_free_context(uci);
 899 }
 900
 901 static void handle_signal(int signal)
 902 {
 903         char b[1] = {0};
 904
 905         if (signal == SIGHUP) {
 906                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 907         } else
 908                 uloop_end();
 909 }
 910
 911 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 912 {
 913         char b[512];
 914         if (read(u->fd, b, sizeof(b)) < 0) {}
 915
 916         odhcpd_reload();
 917 }
 918
 919 static struct uloop_fd reload_fd = { .cb = reload_cb };
 920
 921 void odhcpd_run(void)
 922 {
 923         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 924
 925         reload_fd.fd = reload_pipe[0];
 926         uloop_fd_add(&reload_fd, ULOOP_READ);
 927
 928         signal(SIGTERM, handle_signal);
 929         signal(SIGINT, handle_signal);
 930         signal(SIGHUP, handle_signal);
 931
 932 #ifdef WITH_UBUS
 933         while (ubus_init())
 934                 sleep(1);
 935 #endif
 936
 937         odhcpd_reload();
 938         uloop_run();
 939 }
 940