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_DHCPV6_RAW,
  46         IFACE_ATTR_DHCPV6_ASSIGNALL,
  47         IFACE_ATTR_RA_DEFAULT,
  48         IFACE_ATTR_RA_MANAGEMENT,
  49         IFACE_ATTR_RA_OFFLINK,
  50         IFACE_ATTR_RA_PREFERENCE,
  51         IFACE_ATTR_RA_ADVROUTER,
  52         IFACE_ATTR_RA_MININTERVAL,
  53         IFACE_ATTR_RA_MAXINTERVAL,
  54         IFACE_ATTR_RA_LIFETIME,
  55         IFACE_ATTR_RA_USELEASETIME,
  56         IFACE_ATTR_RA_REACHABLETIME,
  57         IFACE_ATTR_RA_RETRANSTIME,
  58         IFACE_ATTR_RA_HOPLIMIT,
  59         IFACE_ATTR_RA_MTU,
  60         IFACE_ATTR_PD_MANAGER,
  61         IFACE_ATTR_PD_CER,
  62         IFACE_ATTR_NDPROXY_ROUTING,
  63         IFACE_ATTR_NDPROXY_SLAVE,
  64         IFACE_ATTR_MAX
  65 };
  66
  67 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  68         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  73         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  75         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  76         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  77         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  83         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  84         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  85         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  88         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  95         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  97         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  98         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  99         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 102         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 103         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 105 };
 106
 107 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 108         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 109         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 110         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 111 };
 112
 113 const struct uci_blob_param_list interface_attr_list = {
 114         .n_params = IFACE_ATTR_MAX,
 115         .params = iface_attrs,
 116         .info = iface_attr_info,
 117 };
 118
 119 enum {
 120         LEASE_ATTR_IP,
 121         LEASE_ATTR_MAC,
 122         LEASE_ATTR_DUID,
 123         LEASE_ATTR_HOSTID,
 124         LEASE_ATTR_LEASETIME,
 125         LEASE_ATTR_NAME,
 126         LEASE_ATTR_MAX
 127 };
 128
 129 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 130         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 131         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 132         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 133         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 134         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 135         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 136 };
 137
 138 const struct uci_blob_param_list lease_attr_list = {
 139         .n_params = LEASE_ATTR_MAX,
 140         .params = lease_attrs,
 141 };
 142
 143 enum {
 144         ODHCPD_ATTR_LEGACY,
 145         ODHCPD_ATTR_MAINDHCP,
 146         ODHCPD_ATTR_LEASEFILE,
 147         ODHCPD_ATTR_LEASETRIGGER,
 148         ODHCPD_ATTR_LOGLEVEL,
 149         ODHCPD_ATTR_MAX
 150 };
 151
 152 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 153         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 154         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 155         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 156         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 157         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 158 };
 159
 160 const struct uci_blob_param_list odhcpd_attr_list = {
 161         .n_params = ODHCPD_ATTR_MAX,
 162         .params = odhcpd_attrs,
 163 };
 164
 165 static int mkdir_p(char *dir, mode_t mask)
 166 {
 167         char *l = strrchr(dir, '/');
 168         int ret;
 169
 170         if (!l)
 171                 return 0;
 172
 173         *l = '\0';
 174
 175         if (mkdir_p(dir, mask))
 176                 return -1;
 177
 178         *l = '/';
 179
 180         ret = mkdir(dir, mask);
 181         if (ret && errno == EEXIST)
 182                 return 0;
 183
 184         if (ret)
 185                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 186
 187         return ret;
 188 }
 189
 190 static void free_lease(struct lease *l)
 191 {
 192         if (l->head.next)
 193                 list_del(&l->head);
 194
 195         free(l->duid);
 196         free(l);
 197 }
 198
 199 static struct interface* get_interface(const char *name)
 200 {
 201         struct interface *c;
 202         list_for_each_entry(c, &interfaces, head)
 203                 if (!strcmp(c->name, name))
 204                         return c;
 205         return NULL;
 206 }
 207
 208 static void set_interface_defaults(struct interface *iface)
 209 {
 210         iface->learn_routes = 1;
 211         iface->dhcpv4_leasetime = 43200;
 212         iface->dhcpv6_assignall = true;
 213         iface->ra_managed = RA_MANAGED_MFLAG;
 214         iface->ra_maxinterval = 600;
 215         iface->ra_mininterval = iface->ra_maxinterval/3;
 216         iface->ra_lifetime = -1;
 217 }
 218
 219 static void clean_interface(struct interface *iface)
 220 {
 221         free(iface->dns);
 222         free(iface->search);
 223         free(iface->upstream);
 224         free(iface->dhcpv4_router);
 225         free(iface->dhcpv4_dns);
 226         free(iface->dhcpv6_raw);
 227         free(iface->filter_class);
 228         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 229         set_interface_defaults(iface);
 230 }
 231
 232 static void close_interface(struct interface *iface)
 233 {
 234         if (iface->head.next)
 235                 list_del(&iface->head);
 236
 237         setup_router_interface(iface, false);
 238         setup_dhcpv6_interface(iface, false);
 239         setup_ndp_interface(iface, false);
 240         setup_dhcpv4_interface(iface, false);
 241
 242         clean_interface(iface);
 243         free(iface->addr4);
 244         free(iface->ia_addr);
 245         free(iface->ifname);
 246         free(iface);
 247 }
 248
 249 static int parse_mode(const char *mode)
 250 {
 251         if (!strcmp(mode, "disabled"))
 252                 return MODE_DISABLED;
 253         else if (!strcmp(mode, "server"))
 254                 return MODE_SERVER;
 255         else if (!strcmp(mode, "relay"))
 256                 return MODE_RELAY;
 257         else if (!strcmp(mode, "hybrid"))
 258                 return MODE_HYBRID;
 259         else
 260                 return -1;
 261 }
 262
 263 static void set_config(struct uci_section *s)
 264 {
 265         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 266
 267         blob_buf_init(&b, 0);
 268         uci_to_blob(&b, s, &odhcpd_attr_list);
 269         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 270
 271         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 272                 config.legacy = blobmsg_get_bool(c);
 273
 274         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 275                 config.main_dhcpv4 = blobmsg_get_bool(c);
 276
 277         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 278                 free(config.dhcp_statefile);
 279                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 280         }
 281
 282         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 283                 free(config.dhcp_cb);
 284                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 285         }
 286
 287         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 288                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 289
 290                 if (config.log_level != log_level) {
 291                         config.log_level = log_level;
 292                         setlogmask(LOG_UPTO(config.log_level));
 293                 }
 294         }
 295 }
 296
 297 static double parse_leasetime(struct blob_attr *c) {
 298         char *val = blobmsg_get_string(c), *endptr = NULL;
 299         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 300
 301         if (time && endptr && endptr[0]) {
 302                 if (endptr[0] == 's')
 303                         time *= 1;
 304                 else if (endptr[0] == 'm')
 305                         time *= 60;
 306                 else if (endptr[0] == 'h')
 307                         time *= 3600;
 308                 else if (endptr[0] == 'd')
 309                         time *= 24 * 3600;
 310                 else if (endptr[0] == 'w')
 311                         time *= 7 * 24 * 3600;
 312                 else
 313                         goto err;
 314         }
 315
 316         if (time < 60)
 317                 time = 60;
 318
 319         return time;
 320
 321 err:
 322         return -1;
 323 }
 324
 325 static int set_lease(struct uci_section *s)
 326 {
 327         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 328
 329         blob_buf_init(&b, 0);
 330         uci_to_blob(&b, s, &lease_attr_list);
 331         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 332
 333         size_t hostlen = 1;
 334         if ((c = tb[LEASE_ATTR_NAME]))
 335                 hostlen = blobmsg_data_len(c);
 336
 337         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 338         if (!lease)
 339                 goto err;
 340
 341         if (hostlen > 1)
 342                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 343
 344         if ((c = tb[LEASE_ATTR_IP]))
 345                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 346                         goto err;
 347
 348         if ((c = tb[LEASE_ATTR_MAC]))
 349                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 350                         goto err;
 351
 352         if ((c = tb[LEASE_ATTR_DUID])) {
 353                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 354                 lease->duid = malloc(duidlen);
 355                 if (!lease->duid)
 356                         goto err;
 357
 358                 ssize_t len = odhcpd_unhexlify(lease->duid,
 359                                 duidlen, blobmsg_get_string(c));
 360
 361                 if (len < 0)
 362                         goto err;
 363
 364                 lease->duid_len = len;
 365         }
 366
 367         if ((c = tb[LEASE_ATTR_HOSTID])) {
 368                 errno = 0;
 369                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 370                 if (errno)
 371                         goto err;
 372         }
 373
 374         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 375                 double time = parse_leasetime(c);
 376                 if (time < 0)
 377                         goto err;
 378
 379                 lease->dhcpv4_leasetime = time;
 380         }
 381
 382         list_add(&lease->head, &leases);
 383         return 0;
 384
 385 err:
 386         if (lease)
 387                 free_lease(lease);
 388
 389         return -1;
 390 }
 391
 392 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 393 {
 394         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 395         bool get_addrs = false;
 396
 397         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 398
 399         if (tb[IFACE_ATTR_INTERFACE])
 400                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 401
 402         if (!name)
 403                 return -1;
 404
 405         struct interface *iface = get_interface(name);
 406         if (!iface) {
 407                 char *iface_name;
 408
 409                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 410                 if (!iface)
 411                         return -1;
 412
 413                 iface->name = strcpy(iface_name, name);
 414
 415                 set_interface_defaults(iface);
 416
 417                 list_add(&iface->head, &interfaces);
 418                 get_addrs = overwrite = true;
 419         }
 420
 421         const char *ifname = NULL;
 422         if (overwrite) {
 423                 if ((c = tb[IFACE_ATTR_IFNAME]))
 424                         ifname = blobmsg_get_string(c);
 425                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 426                         ifname = blobmsg_get_string(c);
 427         }
 428
 429 #ifdef WITH_UBUS
 430         if (overwrite || !iface->ifname)
 431                 ifname = ubus_get_ifname(name);
 432 #endif
 433
 434         if (!iface->ifname && !ifname)
 435                 goto err;
 436
 437         if (ifname) {
 438                 free(iface->ifname);
 439                 iface->ifname = strdup(ifname);
 440
 441                 if (!iface->ifname)
 442                         goto err;
 443         }
 444
 445         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 446                 goto err;
 447
 448         if (get_addrs) {
 449                 ssize_t len = odhcpd_get_interface_addresses(iface->ifindex,
 450                                                 true, &iface->ia_addr);
 451
 452                 if (len > 0)
 453                         iface->ia_addr_len = len;
 454
 455                 len = odhcpd_get_interface_addresses(iface->ifindex,
 456                                                 false, &iface->addr4);
 457                 if (len > 0)
 458                         iface->addr4_len = len;
 459         }
 460
 461         iface->inuse = true;
 462
 463         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 464                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 465
 466         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 467                 iface->ignore = blobmsg_get_bool(c);
 468
 469         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 470                 double time = parse_leasetime(c);
 471                 if (time < 0)
 472                         goto err;
 473
 474                 iface->dhcpv4_leasetime = time;
 475         }
 476
 477         if ((c = tb[IFACE_ATTR_START])) {
 478                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 479
 480                 if (config.main_dhcpv4 && config.legacy)
 481                         iface->dhcpv4 = MODE_SERVER;
 482         }
 483
 484         if ((c = tb[IFACE_ATTR_LIMIT]))
 485                 iface->dhcpv4_end.s_addr = htonl(
 486                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 487
 488         if ((c = tb[IFACE_ATTR_MASTER]))
 489                 iface->master = blobmsg_get_bool(c);
 490
 491         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 492                 struct blob_attr *cur;
 493                 unsigned rem;
 494
 495                 blobmsg_for_each_attr(cur, c, rem) {
 496                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 497                                 continue;
 498
 499                         iface->upstream = realloc(iface->upstream,
 500                                         iface->upstream_len + blobmsg_data_len(cur));
 501                         if (!iface->upstream)
 502                                 goto err;
 503
 504                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 505                         iface->upstream_len += blobmsg_data_len(cur);
 506                 }
 507         }
 508
 509         int mode;
 510         if ((c = tb[IFACE_ATTR_RA])) {
 511                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 512                         iface->ra = mode;
 513                 else
 514                         goto err;
 515         }
 516
 517         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 518                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 519                         if (config.main_dhcpv4)
 520                                 iface->dhcpv4 = mode;
 521                 }
 522                 else
 523                         goto err;
 524         }
 525
 526         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 527                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 528                         iface->dhcpv6 = mode;
 529                 else
 530                         goto err;
 531         }
 532
 533         if ((c = tb[IFACE_ATTR_NDP])) {
 534                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 535                         iface->ndp = mode;
 536                 else
 537                         goto err;
 538         }
 539
 540         if ((c = tb[IFACE_ATTR_ROUTER])) {
 541                 struct blob_attr *cur;
 542                 unsigned rem;
 543
 544                 blobmsg_for_each_attr(cur, c, rem) {
 545                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 546                                 continue;
 547
 548                         struct in_addr addr4;
 549                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 550                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 551                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 552                                 if (!iface->dhcpv4_router)
 553                                         goto err;
 554
 555                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 556                         } else
 557                                 goto err;
 558                 }
 559         }
 560
 561         if ((c = tb[IFACE_ATTR_DNS])) {
 562                 struct blob_attr *cur;
 563                 unsigned rem;
 564
 565                 iface->always_rewrite_dns = true;
 566                 blobmsg_for_each_attr(cur, c, rem) {
 567                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 568                                 continue;
 569
 570                         struct in_addr addr4;
 571                         struct in6_addr addr6;
 572                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 573                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 574                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 575                                 if (!iface->dhcpv4_dns)
 576                                         goto err;
 577
 578                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 579                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 580                                 iface->dns = realloc(iface->dns,
 581                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 582                                 if (!iface->dns)
 583                                         goto err;
 584
 585                                 iface->dns[iface->dns_cnt - 1] = addr6;
 586                         } else
 587                                 goto err;
 588                 }
 589         }
 590
 591         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 592                 struct blob_attr *cur;
 593                 unsigned rem;
 594
 595                 blobmsg_for_each_attr(cur, c, rem) {
 596                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 597                                 continue;
 598
 599                         uint8_t buf[256];
 600                         char *domain = blobmsg_get_string(cur);
 601                         size_t domainlen = strlen(domain);
 602                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 603                                 domain[domainlen - 1] = 0;
 604
 605                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 606                         if (len <= 0)
 607                                 goto err;
 608
 609                         iface->search = realloc(iface->search, iface->search_len + len);
 610                         if (!iface->search)
 611                                 goto err;
 612
 613                         memcpy(&iface->search[iface->search_len], buf, len);
 614                         iface->search_len += len;
 615                 }
 616         }
 617
 618         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 619                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 620                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 621         }
 622
 623         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 624                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 625                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 626                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 627         }
 628
 629         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 630                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 631
 632         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 633                 iface->default_router = blobmsg_get_u32(c);
 634
 635         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 636                 iface->ra_managed = blobmsg_get_u32(c);
 637
 638         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 639                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 640                 if (ra_reachabletime > 3600000)
 641                         goto err;
 642
 643                 iface->ra_reachabletime = ra_reachabletime;
 644         }
 645
 646         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 647                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 648                 if (ra_retranstime > 60000)
 649                         goto err;
 650
 651                 iface->ra_retranstime = ra_retranstime;
 652         }
 653
 654         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 655                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 656                 if (ra_hoplimit > 255)
 657                         goto err;
 658
 659                 iface->ra_hoplimit = ra_hoplimit;
 660         }
 661
 662         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 663                 uint32_t ra_mtu = blobmsg_get_u32(c);
 664                 if (ra_mtu < 1280 || ra_mtu > 65535)
 665                         goto err;
 666
 667                 iface->ra_mtu = ra_mtu;
 668         }
 669
 670         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 671                 iface->ra_not_onlink = blobmsg_get_bool(c);
 672
 673         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 674                 iface->ra_advrouter = blobmsg_get_bool(c);
 675
 676         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 677                 iface->ra_mininterval =  blobmsg_get_u32(c);
 678
 679         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 680                 iface->ra_maxinterval = blobmsg_get_u32(c);
 681
 682         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 683                 iface->ra_lifetime = blobmsg_get_u32(c);
 684
 685         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 686                 iface->ra_useleasetime = blobmsg_get_bool(c);
 687
 688         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 689                 const char *prio = blobmsg_get_string(c);
 690
 691                 if (!strcmp(prio, "high"))
 692                         iface->route_preference = 1;
 693                 else if (!strcmp(prio, "low"))
 694                         iface->route_preference = -1;
 695                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 696                         iface->route_preference = 0;
 697                 else
 698                         goto err;
 699         }
 700
 701         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 702                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 703                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 704
 705         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 706                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 707                 goto err;
 708
 709         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 710                 iface->learn_routes = blobmsg_get_bool(c);
 711
 712         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 713                 iface->external = blobmsg_get_bool(c);
 714
 715         return 0;
 716
 717 err:
 718         close_interface(iface);
 719         return -1;
 720 }
 721
 722 static int set_interface(struct uci_section *s)
 723 {
 724         blob_buf_init(&b, 0);
 725         uci_to_blob(&b, s, &interface_attr_list);
 726
 727         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 728 }
 729
 730 void odhcpd_reload(void)
 731 {
 732         struct uci_context *uci = uci_alloc_context();
 733
 734         while (!list_empty(&leases))
 735                 free_lease(list_first_entry(&leases, struct lease, head));
 736
 737         struct interface *master = NULL, *i, *n;
 738
 739         if (!uci)
 740                 return;
 741
 742         list_for_each_entry(i, &interfaces, head)
 743                 clean_interface(i);
 744
 745         struct uci_package *dhcp = NULL;
 746         if (!uci_load(uci, "dhcp", &dhcp)) {
 747                 struct uci_element *e;
 748                 uci_foreach_element(&dhcp->sections, e) {
 749                         struct uci_section *s = uci_to_section(e);
 750                         if (!strcmp(s->type, "host"))
 751                                 set_lease(s);
 752                         else if (!strcmp(s->type, "odhcpd"))
 753                                 set_config(s);
 754                 }
 755
 756                 uci_foreach_element(&dhcp->sections, e) {
 757                         struct uci_section *s = uci_to_section(e);
 758                         if (!strcmp(s->type, "dhcp"))
 759                                 set_interface(s);
 760                 }
 761         }
 762
 763         if (config.dhcp_statefile) {
 764                 char *path = strdup(config.dhcp_statefile);
 765
 766                 mkdir_p(dirname(path), 0755);
 767                 free(path);
 768         }
 769
 770 #ifdef WITH_UBUS
 771         ubus_apply_network();
 772 #endif
 773
 774         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 775
 776         /* Test for */
 777         list_for_each_entry(i, &interfaces, head) {
 778                 if (i->master)
 779                         continue;
 780
 781                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 782                         any_dhcpv6_slave = true;
 783
 784                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 785                         any_ra_slave = true;
 786
 787                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 788                         any_ndp_slave = true;
 789         }
 790
 791         /* Evaluate hybrid mode for master */
 792         list_for_each_entry(i, &interfaces, head) {
 793                 if (!i->master)
 794                         continue;
 795
 796                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 797 #ifdef WITH_UBUS
 798                 if (!ubus_has_prefix(i->name, i->ifname))
 799                         hybrid_mode = MODE_RELAY;
 800 #endif
 801
 802                 if (i->dhcpv6 == MODE_HYBRID)
 803                         i->dhcpv6 = hybrid_mode;
 804
 805                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 806                         i->dhcpv6 = MODE_DISABLED;
 807
 808                 if (i->ra == MODE_HYBRID)
 809                         i->ra = hybrid_mode;
 810
 811                 if (i->ra == MODE_RELAY && !any_ra_slave)
 812                         i->ra = MODE_DISABLED;
 813
 814                 if (i->ndp == MODE_HYBRID)
 815                         i->ndp = hybrid_mode;
 816
 817                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 818                         i->ndp = MODE_DISABLED;
 819
 820                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 821                         master = i;
 822         }
 823
 824
 825         list_for_each_entry_safe(i, n, &interfaces, head) {
 826                 if (i->inuse) {
 827                         /* Resolve hybrid mode */
 828                         if (i->dhcpv6 == MODE_HYBRID)
 829                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 830                                                 MODE_RELAY : MODE_SERVER;
 831
 832                         if (i->ra == MODE_HYBRID)
 833                                 i->ra = (master && master->ra == MODE_RELAY) ?
 834                                                 MODE_RELAY : MODE_SERVER;
 835
 836                         if (i->ndp == MODE_HYBRID)
 837                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 838                                                 MODE_RELAY : MODE_DISABLED;
 839
 840                         setup_router_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 841                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 842                         setup_ndp_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 843                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 844                 } else
 845                         close_interface(i);
 846         }
 847
 848         uci_unload(uci, dhcp);
 849         uci_free_context(uci);
 850 }
 851
 852 static void handle_signal(int signal)
 853 {
 854         char b[1] = {0};
 855
 856         if (signal == SIGHUP) {
 857                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 858         } else
 859                 uloop_end();
 860 }
 861
 862 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 863 {
 864         char b[512];
 865         if (read(u->fd, b, sizeof(b)) < 0) {}
 866
 867         odhcpd_reload();
 868 }
 869
 870 static struct uloop_fd reload_fd = { .cb = reload_cb };
 871
 872 void odhcpd_run(void)
 873 {
 874         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 875
 876         reload_fd.fd = reload_pipe[0];
 877         uloop_fd_add(&reload_fd, ULOOP_READ);
 878
 879         signal(SIGTERM, handle_signal);
 880         signal(SIGINT, handle_signal);
 881         signal(SIGHUP, handle_signal);
 882
 883 #ifdef WITH_UBUS
 884         while (init_ubus())
 885                 sleep(1);
 886 #endif
 887
 888         odhcpd_reload();
 889         uloop_run();
 890
 891         while (!list_empty(&interfaces))
 892                 close_interface(list_first_entry(&interfaces, struct interface, head));
 893 }
 894