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