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 #include <libubox/list.h>
  18 #include <libubox/vlist.h>
  19
  20 #include "odhcpd.h"
  21
  22 static struct blob_buf b;
  23 static int reload_pipe[2];
  24
  25 static int lease_cmp(const void *k1, const void *k2, void *ptr);
  26 static void lease_update(struct vlist_tree *tree, struct vlist_node *node_new,
  27                          struct vlist_node *node_old);
  28
  29 struct vlist_tree leases = VLIST_TREE_INIT(leases, lease_cmp, lease_update, true, false);
  30 AVL_TREE(interfaces, avl_strcmp, false, NULL);
  31 struct config config = {.legacy = false, .main_dhcpv4 = false,
  32                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  33                         .log_level = LOG_INFO};
  34
  35 enum {
  36         IFACE_ATTR_INTERFACE,
  37         IFACE_ATTR_IFNAME,
  38         IFACE_ATTR_NETWORKID,
  39         IFACE_ATTR_DYNAMICDHCP,
  40         IFACE_ATTR_IGNORE,
  41         IFACE_ATTR_LEASETIME,
  42         IFACE_ATTR_LIMIT,
  43         IFACE_ATTR_START,
  44         IFACE_ATTR_MASTER,
  45         IFACE_ATTR_UPSTREAM,
  46         IFACE_ATTR_RA,
  47         IFACE_ATTR_DHCPV4,
  48         IFACE_ATTR_DHCPV6,
  49         IFACE_ATTR_NDP,
  50         IFACE_ATTR_ROUTER,
  51         IFACE_ATTR_DNS,
  52         IFACE_ATTR_DOMAIN,
  53         IFACE_ATTR_FILTER_CLASS,
  54         IFACE_ATTR_DHCPV4_FORCERECONF,
  55         IFACE_ATTR_DHCPV6_RAW,
  56         IFACE_ATTR_DHCPV6_ASSIGNALL,
  57         IFACE_ATTR_DHCPV6_PD,
  58         IFACE_ATTR_DHCPV6_NA,
  59         IFACE_ATTR_RA_DEFAULT,
  60         IFACE_ATTR_RA_MANAGEMENT,
  61         IFACE_ATTR_RA_OFFLINK,
  62         IFACE_ATTR_RA_PREFERENCE,
  63         IFACE_ATTR_RA_ADVROUTER,
  64         IFACE_ATTR_RA_MININTERVAL,
  65         IFACE_ATTR_RA_MAXINTERVAL,
  66         IFACE_ATTR_RA_LIFETIME,
  67         IFACE_ATTR_RA_USELEASETIME,
  68         IFACE_ATTR_RA_REACHABLETIME,
  69         IFACE_ATTR_RA_RETRANSTIME,
  70         IFACE_ATTR_RA_HOPLIMIT,
  71         IFACE_ATTR_RA_MTU,
  72         IFACE_ATTR_RA_DNS,
  73         IFACE_ATTR_PD_MANAGER,
  74         IFACE_ATTR_PD_CER,
  75         IFACE_ATTR_NDPROXY_ROUTING,
  76         IFACE_ATTR_NDPROXY_SLAVE,
  77         IFACE_ATTR_PREFIX_FILTER,
  78         IFACE_ATTR_MAX
  79 };
  80
  81 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  82         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  86         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  87         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  89         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  92         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  96         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  97         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  98         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  99         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 100         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 101         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 102         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 103         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 105         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 106         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 107         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 108         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 109         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 110         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 111         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 112         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 113         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 114         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 115         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 116         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 117         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 118         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 119         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 121         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 122         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 123         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 124 };
 125
 126 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 127         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 128         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 129         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 130 };
 131
 132 const struct uci_blob_param_list interface_attr_list = {
 133         .n_params = IFACE_ATTR_MAX,
 134         .params = iface_attrs,
 135         .info = iface_attr_info,
 136 };
 137
 138 enum {
 139         LEASE_ATTR_IP,
 140         LEASE_ATTR_MAC,
 141         LEASE_ATTR_DUID,
 142         LEASE_ATTR_HOSTID,
 143         LEASE_ATTR_LEASETIME,
 144         LEASE_ATTR_NAME,
 145         LEASE_ATTR_MAX
 146 };
 147
 148 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 149         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 150         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 151         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 152         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 153         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 154         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 155 };
 156
 157 const struct uci_blob_param_list lease_attr_list = {
 158         .n_params = LEASE_ATTR_MAX,
 159         .params = lease_attrs,
 160 };
 161
 162 enum {
 163         ODHCPD_ATTR_LEGACY,
 164         ODHCPD_ATTR_MAINDHCP,
 165         ODHCPD_ATTR_LEASEFILE,
 166         ODHCPD_ATTR_LEASETRIGGER,
 167         ODHCPD_ATTR_LOGLEVEL,
 168         ODHCPD_ATTR_MAX
 169 };
 170
 171 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 172         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 173         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 174         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 175         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 176         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 177 };
 178
 179 const struct uci_blob_param_list odhcpd_attr_list = {
 180         .n_params = ODHCPD_ATTR_MAX,
 181         .params = odhcpd_attrs,
 182 };
 183
 184 static int mkdir_p(char *dir, mode_t mask)
 185 {
 186         char *l = strrchr(dir, '/');
 187         int ret;
 188
 189         if (!l)
 190                 return 0;
 191
 192         *l = '\0';
 193
 194         if (mkdir_p(dir, mask))
 195                 return -1;
 196
 197         *l = '/';
 198
 199         ret = mkdir(dir, mask);
 200         if (ret && errno == EEXIST)
 201                 return 0;
 202
 203         if (ret)
 204                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 205
 206         return ret;
 207 }
 208
 209 static void set_interface_defaults(struct interface *iface)
 210 {
 211         iface->learn_routes = 1;
 212         iface->dhcpv4_leasetime = 43200;
 213         iface->dhcpv6_assignall = true;
 214         iface->dhcpv6_pd = true;
 215         iface->dhcpv6_na = true;
 216         iface->ra_managed = RA_MANAGED_MFLAG;
 217         iface->ra_maxinterval = 600;
 218         iface->ra_mininterval = iface->ra_maxinterval/3;
 219         iface->ra_lifetime = -1;
 220         iface->ra_dns = true;
 221 }
 222
 223 static void clean_interface(struct interface *iface)
 224 {
 225         free(iface->dns);
 226         free(iface->search);
 227         free(iface->upstream);
 228         free(iface->dhcpv4_router);
 229         free(iface->dhcpv4_dns);
 230         free(iface->dhcpv6_raw);
 231         free(iface->filter_class);
 232         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 233         set_interface_defaults(iface);
 234 }
 235
 236 static void close_interface(struct interface *iface)
 237 {
 238         avl_delete(&interfaces, &iface->avl);
 239
 240         router_setup_interface(iface, false);
 241         dhcpv6_setup_interface(iface, false);
 242         ndp_setup_interface(iface, false);
 243 #ifdef DHCPV4_SUPPORT
 244         dhcpv4_setup_interface(iface, false);
 245 #endif
 246
 247         clean_interface(iface);
 248         free(iface->addr4);
 249         free(iface->addr6);
 250         free(iface->ifname);
 251         free(iface);
 252 }
 253
 254 static int parse_mode(const char *mode)
 255 {
 256         if (!strcmp(mode, "disabled"))
 257                 return MODE_DISABLED;
 258         else if (!strcmp(mode, "server"))
 259                 return MODE_SERVER;
 260         else if (!strcmp(mode, "relay"))
 261                 return MODE_RELAY;
 262         else if (!strcmp(mode, "hybrid"))
 263                 return MODE_HYBRID;
 264         else
 265                 return -1;
 266 }
 267
 268 static void set_config(struct uci_section *s)
 269 {
 270         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 271
 272         blob_buf_init(&b, 0);
 273         uci_to_blob(&b, s, &odhcpd_attr_list);
 274         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 275
 276         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 277                 config.legacy = blobmsg_get_bool(c);
 278
 279         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 280                 config.main_dhcpv4 = blobmsg_get_bool(c);
 281
 282         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 283                 free(config.dhcp_statefile);
 284                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 285         }
 286
 287         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 288                 free(config.dhcp_cb);
 289                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 290         }
 291
 292         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 293                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 294
 295                 if (config.log_level != log_level) {
 296                         config.log_level = log_level;
 297                         setlogmask(LOG_UPTO(config.log_level));
 298                 }
 299         }
 300 }
 301
 302 static double parse_leasetime(struct blob_attr *c) {
 303         char *val = blobmsg_get_string(c), *endptr = NULL;
 304         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 305
 306         if (time && endptr && endptr[0]) {
 307                 if (endptr[0] == 's')
 308                         time *= 1;
 309                 else if (endptr[0] == 'm')
 310                         time *= 60;
 311                 else if (endptr[0] == 'h')
 312                         time *= 3600;
 313                 else if (endptr[0] == 'd')
 314                         time *= 24 * 3600;
 315                 else if (endptr[0] == 'w')
 316                         time *= 7 * 24 * 3600;
 317                 else
 318                         goto err;
 319         }
 320
 321         if (time < 60)
 322                 time = 60;
 323
 324         return time;
 325
 326 err:
 327         return -1;
 328 }
 329
 330 static void free_lease(struct lease *l)
 331 {
 332         free(l->hostname);
 333         free(l);
 334 }
 335
 336 static int set_lease(struct uci_section *s)
 337 {
 338         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 339         struct lease *l;
 340         size_t duidlen = 0;
 341         uint8_t *duid;
 342
 343         blob_buf_init(&b, 0);
 344         uci_to_blob(&b, s, &lease_attr_list);
 345         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 346
 347         if ((c = tb[LEASE_ATTR_DUID]))
 348                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 349
 350         l = calloc_a(sizeof(*l), &duid, duidlen);
 351         if (!l)
 352                 goto err;
 353
 354         if ((c = tb[LEASE_ATTR_MAC]))
 355                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 356                         goto err;
 357
 358         if ((c = tb[LEASE_ATTR_DUID])) {
 359                 ssize_t len;
 360
 361                 l->duid = duid;
 362                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 363
 364                 if (len < 0)
 365                         goto err;
 366
 367                 l->duid_len = len;
 368         }
 369
 370         if ((c = tb[LEASE_ATTR_NAME])) {
 371                 l->hostname = strdup(blobmsg_get_string(c));
 372                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 373                         goto err;
 374         }
 375
 376         if ((c = tb[LEASE_ATTR_IP]))
 377                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 378                         goto err;
 379
 380         if ((c = tb[LEASE_ATTR_HOSTID])) {
 381                 errno = 0;
 382                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 383                 if (errno)
 384                         goto err;
 385         } else {
 386                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 387                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 388         }
 389
 390         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 391                 double time = parse_leasetime(c);
 392                 if (time < 0)
 393                         goto err;
 394
 395                 l->leasetime = time;
 396         }
 397
 398         INIT_LIST_HEAD(&l->assignments);
 399         vlist_add(&leases, &l->node, l);
 400         return 0;
 401
 402 err:
 403         if (l)
 404                 free_lease(l);
 405
 406         return -1;
 407 }
 408
 409 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 410 {
 411         struct interface *iface;
 412         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 413         bool get_addrs = false;
 414
 415         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 416
 417         if (tb[IFACE_ATTR_INTERFACE])
 418                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 419
 420         if (!name)
 421                 return -1;
 422
 423         iface = avl_find_element(&interfaces, name, iface, avl);
 424         if (!iface) {
 425                 char *new_name;
 426
 427                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 428                 if (!iface)
 429                         return -1;
 430
 431                 iface->name = strcpy(new_name, name);
 432                 iface->avl.key = iface->name;
 433                 iface->router_event.uloop.fd = -1;
 434                 iface->dhcpv6_event.uloop.fd = -1;
 435                 iface->ndp_event.uloop.fd = -1;
 436                 iface->dhcpv4_event.uloop.fd = -1;
 437                 set_interface_defaults(iface);
 438
 439                 avl_insert(&interfaces, &iface->avl);
 440                 get_addrs = overwrite = true;
 441         }
 442
 443         const char *ifname = NULL;
 444         if (overwrite) {
 445                 if ((c = tb[IFACE_ATTR_IFNAME]))
 446                         ifname = blobmsg_get_string(c);
 447                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 448                         ifname = blobmsg_get_string(c);
 449         }
 450
 451 #ifdef WITH_UBUS
 452         if (overwrite || !iface->ifname)
 453                 ifname = ubus_get_ifname(name);
 454 #endif
 455
 456         if (!iface->ifname && !ifname)
 457                 goto err;
 458
 459         if (ifname) {
 460                 free(iface->ifname);
 461                 iface->ifname = strdup(ifname);
 462
 463                 if (!iface->ifname)
 464                         goto err;
 465
 466                 if (!iface->ifindex &&
 467                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 468                         goto err;
 469         }
 470
 471         if (get_addrs) {
 472                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 473                                                 true, &iface->addr6);
 474
 475                 if (len > 0)
 476                         iface->addr6_len = len;
 477
 478                 len = netlink_get_interface_addrs(iface->ifindex,
 479                                                 false, &iface->addr4);
 480                 if (len > 0)
 481                         iface->addr4_len = len;
 482         }
 483
 484         iface->inuse = true;
 485
 486         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 487                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 488
 489         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 490                 iface->ignore = blobmsg_get_bool(c);
 491
 492         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 493                 double time = parse_leasetime(c);
 494                 if (time < 0)
 495                         goto err;
 496
 497                 iface->dhcpv4_leasetime = time;
 498         }
 499
 500         if ((c = tb[IFACE_ATTR_START])) {
 501                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 502
 503                 if (config.main_dhcpv4 && config.legacy)
 504                         iface->dhcpv4 = MODE_SERVER;
 505         }
 506
 507         if ((c = tb[IFACE_ATTR_LIMIT]))
 508                 iface->dhcpv4_end.s_addr = htonl(
 509                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 510
 511         if ((c = tb[IFACE_ATTR_MASTER]))
 512                 iface->master = blobmsg_get_bool(c);
 513
 514         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 515                 struct blob_attr *cur;
 516                 unsigned rem;
 517
 518                 blobmsg_for_each_attr(cur, c, rem) {
 519                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 520                                 continue;
 521
 522                         iface->upstream = realloc(iface->upstream,
 523                                         iface->upstream_len + blobmsg_data_len(cur));
 524                         if (!iface->upstream)
 525                                 goto err;
 526
 527                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 528                         iface->upstream_len += blobmsg_data_len(cur);
 529                 }
 530         }
 531
 532         int mode;
 533         if ((c = tb[IFACE_ATTR_RA])) {
 534                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 535                         iface->ra = mode;
 536                 else
 537                         goto err;
 538         }
 539
 540         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 541                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 542                         if (config.main_dhcpv4)
 543                                 iface->dhcpv4 = mode;
 544                 }
 545                 else
 546                         goto err;
 547         }
 548
 549         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 550                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 551                         iface->dhcpv6 = mode;
 552                 else
 553                         goto err;
 554         }
 555
 556         if ((c = tb[IFACE_ATTR_NDP])) {
 557                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 558                         iface->ndp = mode;
 559                 else
 560                         goto err;
 561         }
 562
 563         if ((c = tb[IFACE_ATTR_ROUTER])) {
 564                 struct blob_attr *cur;
 565                 unsigned rem;
 566
 567                 blobmsg_for_each_attr(cur, c, rem) {
 568                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 569                                 continue;
 570
 571                         struct in_addr addr4;
 572                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 573                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 574                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 575                                 if (!iface->dhcpv4_router)
 576                                         goto err;
 577
 578                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 579                         } else
 580                                 goto err;
 581                 }
 582         }
 583
 584         if ((c = tb[IFACE_ATTR_DNS])) {
 585                 struct blob_attr *cur;
 586                 unsigned rem;
 587
 588                 iface->always_rewrite_dns = true;
 589                 blobmsg_for_each_attr(cur, c, rem) {
 590                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 591                                 continue;
 592
 593                         struct in_addr addr4;
 594                         struct in6_addr addr6;
 595                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 596                                 if (addr4.s_addr == INADDR_ANY)
 597                                         goto err;
 598
 599                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 600                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 601                                 if (!iface->dhcpv4_dns)
 602                                         goto err;
 603
 604                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 605                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 606                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 607                                         goto err;
 608
 609                                 iface->dns = realloc(iface->dns,
 610                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 611                                 if (!iface->dns)
 612                                         goto err;
 613
 614                                 iface->dns[iface->dns_cnt - 1] = addr6;
 615                         } else
 616                                 goto err;
 617                 }
 618         }
 619
 620         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 621                 struct blob_attr *cur;
 622                 unsigned rem;
 623
 624                 blobmsg_for_each_attr(cur, c, rem) {
 625                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 626                                 continue;
 627
 628                         uint8_t buf[256];
 629                         char *domain = blobmsg_get_string(cur);
 630                         size_t domainlen = strlen(domain);
 631                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 632                                 domain[domainlen - 1] = 0;
 633
 634                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 635                         if (len <= 0)
 636                                 goto err;
 637
 638                         iface->search = realloc(iface->search, iface->search_len + len);
 639                         if (!iface->search)
 640                                 goto err;
 641
 642                         memcpy(&iface->search[iface->search_len], buf, len);
 643                         iface->search_len += len;
 644                 }
 645         }
 646
 647         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 648                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 649                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 650         }
 651
 652         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 653                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 654
 655         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 656                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 657                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 658                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 659         }
 660
 661         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 662                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 663
 664         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 665                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 666
 667         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 668                 iface->dhcpv6_na = blobmsg_get_bool(c);
 669
 670         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 671                 iface->default_router = blobmsg_get_u32(c);
 672
 673         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 674                 iface->ra_managed = blobmsg_get_u32(c);
 675
 676         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 677                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 678                 if (ra_reachabletime > 3600000)
 679                         goto err;
 680
 681                 iface->ra_reachabletime = ra_reachabletime;
 682         }
 683
 684         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 685                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 686                 if (ra_retranstime > 60000)
 687                         goto err;
 688
 689                 iface->ra_retranstime = ra_retranstime;
 690         }
 691
 692         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 693                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 694                 if (ra_hoplimit > 255)
 695                         goto err;
 696
 697                 iface->ra_hoplimit = ra_hoplimit;
 698         }
 699
 700         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 701                 uint32_t ra_mtu = blobmsg_get_u32(c);
 702                 if (ra_mtu < 1280 || ra_mtu > 65535)
 703                         goto err;
 704
 705                 iface->ra_mtu = ra_mtu;
 706         }
 707
 708         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 709                 iface->ra_not_onlink = blobmsg_get_bool(c);
 710
 711         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 712                 iface->ra_advrouter = blobmsg_get_bool(c);
 713
 714         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 715                 iface->ra_mininterval =  blobmsg_get_u32(c);
 716
 717         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 718                 iface->ra_maxinterval = blobmsg_get_u32(c);
 719
 720         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 721                 iface->ra_lifetime = blobmsg_get_u32(c);
 722
 723         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 724                 iface->ra_useleasetime = blobmsg_get_bool(c);
 725
 726         if ((c = tb[IFACE_ATTR_RA_DNS]))
 727                 iface->ra_dns = blobmsg_get_bool(c);
 728
 729         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 730                 const char *prio = blobmsg_get_string(c);
 731
 732                 if (!strcmp(prio, "high"))
 733                         iface->route_preference = 1;
 734                 else if (!strcmp(prio, "low"))
 735                         iface->route_preference = -1;
 736                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 737                         iface->route_preference = 0;
 738                 else
 739                         goto err;
 740         }
 741
 742         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 743                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 744                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 745
 746         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 747                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 748                 goto err;
 749
 750         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 751                 iface->learn_routes = blobmsg_get_bool(c);
 752
 753         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 754                 iface->external = blobmsg_get_bool(c);
 755
 756         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 757                 const char *str = blobmsg_get_string(c);
 758                 char *astr = malloc(strlen(str) + 1);
 759                 char *delim;
 760                 int l;
 761
 762                 if (!astr || !strcpy(astr, str) ||
 763                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 764                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 765                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 766                         iface->pio_filter_length = 0;
 767                 else
 768                         iface->pio_filter_length = l;
 769
 770                 if (astr)
 771                         free(astr);
 772         }
 773
 774         return 0;
 775
 776 err:
 777         close_interface(iface);
 778         return -1;
 779 }
 780
 781 static int set_interface(struct uci_section *s)
 782 {
 783         blob_buf_init(&b, 0);
 784         uci_to_blob(&b, s, &interface_attr_list);
 785
 786         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 787 }
 788
 789 static void lease_delete_assignments(struct lease *l, bool v6)
 790 {
 791         struct dhcp_assignment *a, *tmp;
 792         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 793
 794         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 795                 if (a->flags & flag)
 796                         free_assignment(a);
 797         }
 798 }
 799
 800 static void lease_update_assignments(struct lease *l)
 801 {
 802         struct dhcp_assignment *a;
 803
 804         list_for_each_entry(a, &l->assignments, lease_list) {
 805                 if (a->hostname)
 806                         free(a->hostname);
 807                 a->hostname = NULL;
 808
 809                 if (l->hostname)
 810                         a->hostname = strdup(l->hostname);
 811
 812                 a->leasetime = l->leasetime;
 813         }
 814 }
 815
 816 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 817 {
 818         const struct lease *l1 = k1, *l2 = k2;
 819         int cmp = 0;
 820
 821         if (l1->duid_len != l2->duid_len)
 822                 return l1->duid_len - l2->duid_len;
 823
 824         if (l1->duid_len && l2->duid_len)
 825                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 826
 827         if (cmp)
 828                 return cmp;
 829
 830         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 831                       sizeof(l1->mac.ether_addr_octet));
 832 }
 833
 834 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 835 {
 836         bool update = false;
 837
 838         if ((!!l_new->hostname != !!l_old->hostname) ||
 839             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 840                 free(l_old->hostname);
 841                 l_old->hostname = NULL;
 842
 843                 if (l_new->hostname)
 844                         l_old->hostname = strdup(l_new->hostname);
 845
 846                 update = true;
 847         }
 848
 849         if (l_old->leasetime != l_new->leasetime) {
 850                 l_old->leasetime = l_new->leasetime;
 851                 update = true;
 852         }
 853
 854         if (l_old->ipaddr != l_new->ipaddr) {
 855                 l_old->ipaddr = l_new->ipaddr;
 856                 lease_delete_assignments(l_old, false);
 857         }
 858
 859         if (l_old->hostid != l_new->hostid) {
 860                 l_old->hostid = l_new->hostid;
 861                 lease_delete_assignments(l_old, true);
 862         }
 863
 864         if (update)
 865                 lease_update_assignments(l_old);
 866
 867         free_lease(l_new);
 868 }
 869
 870 static void lease_delete(struct lease *l)
 871 {
 872         struct dhcp_assignment *a;
 873
 874         list_for_each_entry(a, &l->assignments, lease_list)
 875                 free_assignment(a);
 876
 877         free_lease(l);
 878 }
 879
 880 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 881                          struct vlist_node *node_old)
 882 {
 883         struct lease *lease_new = container_of(node_new, struct lease, node);
 884         struct lease *lease_old = container_of(node_old, struct lease, node);
 885
 886         if (node_old && node_new)
 887                 lease_change_config(lease_old, lease_new);
 888         else if (node_old)
 889                 lease_delete(lease_old);
 890 }
 891
 892 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 893 {
 894         struct lease *l;
 895
 896         vlist_for_each_element(&leases, l, node) {
 897                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 898                         return l;
 899         }
 900
 901         return NULL;
 902 }
 903
 904 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 905 {
 906         struct lease *l;
 907
 908         vlist_for_each_element(&leases, l, node) {
 909                 if (!memcmp(l->mac.ether_addr_octet, mac,
 910                             sizeof(l->mac.ether_addr_octet)))
 911                         return l;
 912         }
 913
 914         return NULL;
 915 }
 916
 917 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
 918 {
 919         struct lease *l;
 920
 921         vlist_for_each_element(&leases, l, node) {
 922                 if (l->hostid == hostid)
 923                         return l;
 924         }
 925
 926         return NULL;
 927 }
 928
 929 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
 930 {
 931         struct lease *l;
 932
 933         vlist_for_each_element(&leases, l, node) {
 934                 if (l->ipaddr == ipaddr)
 935                         return l;
 936         }
 937
 938         return NULL;
 939 }
 940
 941 void odhcpd_reload(void)
 942 {
 943         struct uci_context *uci = uci_alloc_context();
 944         struct interface *master = NULL, *i, *tmp;
 945
 946         if (!uci)
 947                 return;
 948
 949         vlist_update(&leases);
 950         avl_for_each_element(&interfaces, i, avl)
 951                 clean_interface(i);
 952
 953         struct uci_package *dhcp = NULL;
 954         if (!uci_load(uci, "dhcp", &dhcp)) {
 955                 struct uci_element *e;
 956                 uci_foreach_element(&dhcp->sections, e) {
 957                         struct uci_section *s = uci_to_section(e);
 958                         if (!strcmp(s->type, "host"))
 959                                 set_lease(s);
 960                         else if (!strcmp(s->type, "odhcpd"))
 961                                 set_config(s);
 962                 }
 963
 964                 uci_foreach_element(&dhcp->sections, e) {
 965                         struct uci_section *s = uci_to_section(e);
 966                         if (!strcmp(s->type, "dhcp"))
 967                                 set_interface(s);
 968                 }
 969         }
 970
 971         if (config.dhcp_statefile) {
 972                 char *path = strdup(config.dhcp_statefile);
 973
 974                 mkdir_p(dirname(path), 0755);
 975                 free(path);
 976         }
 977
 978         vlist_flush(&leases);
 979
 980 #ifdef WITH_UBUS
 981         ubus_apply_network();
 982 #endif
 983
 984         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 985
 986         /* Test for */
 987         avl_for_each_element(&interfaces, i, avl) {
 988                 if (i->master)
 989                         continue;
 990
 991                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 992                         any_dhcpv6_slave = true;
 993
 994                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 995                         any_ra_slave = true;
 996
 997                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 998                         any_ndp_slave = true;
 999         }
1000
1001         /* Evaluate hybrid mode for master */
1002         avl_for_each_element(&interfaces, i, avl) {
1003                 if (!i->master)
1004                         continue;
1005
1006                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1007 #ifdef WITH_UBUS
1008                 if (!ubus_has_prefix(i->name, i->ifname))
1009                         hybrid_mode = MODE_RELAY;
1010 #endif
1011
1012                 if (i->dhcpv6 == MODE_HYBRID)
1013                         i->dhcpv6 = hybrid_mode;
1014
1015                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1016                         i->dhcpv6 = MODE_DISABLED;
1017
1018                 if (i->ra == MODE_HYBRID)
1019                         i->ra = hybrid_mode;
1020
1021                 if (i->ra == MODE_RELAY && !any_ra_slave)
1022                         i->ra = MODE_DISABLED;
1023
1024                 if (i->ndp == MODE_HYBRID)
1025                         i->ndp = hybrid_mode;
1026
1027                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1028                         i->ndp = MODE_DISABLED;
1029
1030                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1031                         master = i;
1032         }
1033
1034
1035         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1036                 if (i->inuse) {
1037                         /* Resolve hybrid mode */
1038                         if (i->dhcpv6 == MODE_HYBRID)
1039                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1040                                                 MODE_RELAY : MODE_SERVER;
1041
1042                         if (i->ra == MODE_HYBRID)
1043                                 i->ra = (master && master->ra == MODE_RELAY) ?
1044                                                 MODE_RELAY : MODE_SERVER;
1045
1046                         if (i->ndp == MODE_HYBRID)
1047                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1048                                                 MODE_RELAY : MODE_DISABLED;
1049
1050                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
1051                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
1052                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
1053 #ifdef DHCPV4_SUPPORT
1054                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
1055 #endif
1056                 } else
1057                         close_interface(i);
1058         }
1059
1060         uci_unload(uci, dhcp);
1061         uci_free_context(uci);
1062 }
1063
1064 static void handle_signal(int signal)
1065 {
1066         char b[1] = {0};
1067
1068         if (signal == SIGHUP) {
1069                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1070         } else
1071                 uloop_end();
1072 }
1073
1074 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1075 {
1076         char b[512];
1077         if (read(u->fd, b, sizeof(b)) < 0) {}
1078
1079         odhcpd_reload();
1080 }
1081
1082 static struct uloop_fd reload_fd = { .cb = reload_cb };
1083
1084 void odhcpd_run(void)
1085 {
1086         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1087
1088         reload_fd.fd = reload_pipe[0];
1089         uloop_fd_add(&reload_fd, ULOOP_READ);
1090
1091         signal(SIGTERM, handle_signal);
1092         signal(SIGINT, handle_signal);
1093         signal(SIGHUP, handle_signal);
1094
1095 #ifdef WITH_UBUS
1096         while (ubus_init())
1097                 sleep(1);
1098 #endif
1099
1100         odhcpd_reload();
1101         uloop_run();
1102 }