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->dhcpv6_event.uloop.fd = -1;
 434                 iface->ndp_event.uloop.fd = -1;
 435                 iface->dhcpv4_event.uloop.fd = -1;
 436                 set_interface_defaults(iface);
 437
 438                 avl_insert(&interfaces, &iface->avl);
 439                 get_addrs = overwrite = true;
 440         }
 441
 442         const char *ifname = NULL;
 443         if (overwrite) {
 444                 if ((c = tb[IFACE_ATTR_IFNAME]))
 445                         ifname = blobmsg_get_string(c);
 446                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 447                         ifname = blobmsg_get_string(c);
 448         }
 449
 450 #ifdef WITH_UBUS
 451         if (overwrite || !iface->ifname)
 452                 ifname = ubus_get_ifname(name);
 453 #endif
 454
 455         if (!iface->ifname && !ifname)
 456                 goto err;
 457
 458         if (ifname) {
 459                 free(iface->ifname);
 460                 iface->ifname = strdup(ifname);
 461
 462                 if (!iface->ifname)
 463                         goto err;
 464
 465                 if (!iface->ifindex &&
 466                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 467                         goto err;
 468         }
 469
 470         if (get_addrs) {
 471                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 472                                                 true, &iface->addr6);
 473
 474                 if (len > 0)
 475                         iface->addr6_len = len;
 476
 477                 len = netlink_get_interface_addrs(iface->ifindex,
 478                                                 false, &iface->addr4);
 479                 if (len > 0)
 480                         iface->addr4_len = len;
 481         }
 482
 483         iface->inuse = true;
 484
 485         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 486                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 487
 488         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 489                 iface->ignore = blobmsg_get_bool(c);
 490
 491         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 492                 double time = parse_leasetime(c);
 493                 if (time < 0)
 494                         goto err;
 495
 496                 iface->dhcpv4_leasetime = time;
 497         }
 498
 499         if ((c = tb[IFACE_ATTR_START])) {
 500                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 501
 502                 if (config.main_dhcpv4 && config.legacy)
 503                         iface->dhcpv4 = MODE_SERVER;
 504         }
 505
 506         if ((c = tb[IFACE_ATTR_LIMIT]))
 507                 iface->dhcpv4_end.s_addr = htonl(
 508                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 509
 510         if ((c = tb[IFACE_ATTR_MASTER]))
 511                 iface->master = blobmsg_get_bool(c);
 512
 513         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 514                 struct blob_attr *cur;
 515                 unsigned rem;
 516
 517                 blobmsg_for_each_attr(cur, c, rem) {
 518                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 519                                 continue;
 520
 521                         iface->upstream = realloc(iface->upstream,
 522                                         iface->upstream_len + blobmsg_data_len(cur));
 523                         if (!iface->upstream)
 524                                 goto err;
 525
 526                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 527                         iface->upstream_len += blobmsg_data_len(cur);
 528                 }
 529         }
 530
 531         int mode;
 532         if ((c = tb[IFACE_ATTR_RA])) {
 533                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 534                         iface->ra = mode;
 535                 else
 536                         goto err;
 537         }
 538
 539         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 540                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 541                         if (config.main_dhcpv4)
 542                                 iface->dhcpv4 = mode;
 543                 }
 544                 else
 545                         goto err;
 546         }
 547
 548         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 549                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 550                         iface->dhcpv6 = mode;
 551                 else
 552                         goto err;
 553         }
 554
 555         if ((c = tb[IFACE_ATTR_NDP])) {
 556                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 557                         iface->ndp = mode;
 558                 else
 559                         goto err;
 560         }
 561
 562         if ((c = tb[IFACE_ATTR_ROUTER])) {
 563                 struct blob_attr *cur;
 564                 unsigned rem;
 565
 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                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 572                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 573                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 574                                 if (!iface->dhcpv4_router)
 575                                         goto err;
 576
 577                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 578                         } else
 579                                 goto err;
 580                 }
 581         }
 582
 583         if ((c = tb[IFACE_ATTR_DNS])) {
 584                 struct blob_attr *cur;
 585                 unsigned rem;
 586
 587                 iface->always_rewrite_dns = true;
 588                 blobmsg_for_each_attr(cur, c, rem) {
 589                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 590                                 continue;
 591
 592                         struct in_addr addr4;
 593                         struct in6_addr addr6;
 594                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 595                                 if (addr4.s_addr == INADDR_ANY)
 596                                         goto err;
 597
 598                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 599                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 600                                 if (!iface->dhcpv4_dns)
 601                                         goto err;
 602
 603                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 604                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 605                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 606                                         goto err;
 607
 608                                 iface->dns = realloc(iface->dns,
 609                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 610                                 if (!iface->dns)
 611                                         goto err;
 612
 613                                 iface->dns[iface->dns_cnt - 1] = addr6;
 614                         } else
 615                                 goto err;
 616                 }
 617         }
 618
 619         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 620                 struct blob_attr *cur;
 621                 unsigned rem;
 622
 623                 blobmsg_for_each_attr(cur, c, rem) {
 624                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 625                                 continue;
 626
 627                         uint8_t buf[256];
 628                         char *domain = blobmsg_get_string(cur);
 629                         size_t domainlen = strlen(domain);
 630                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 631                                 domain[domainlen - 1] = 0;
 632
 633                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 634                         if (len <= 0)
 635                                 goto err;
 636
 637                         iface->search = realloc(iface->search, iface->search_len + len);
 638                         if (!iface->search)
 639                                 goto err;
 640
 641                         memcpy(&iface->search[iface->search_len], buf, len);
 642                         iface->search_len += len;
 643                 }
 644         }
 645
 646         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 647                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 648                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 649         }
 650
 651         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 652                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 653
 654         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 655                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 656                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 657                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 658         }
 659
 660         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 661                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 662
 663         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 664                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 665
 666         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 667                 iface->dhcpv6_na = blobmsg_get_bool(c);
 668
 669         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 670                 iface->default_router = blobmsg_get_u32(c);
 671
 672         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 673                 iface->ra_managed = blobmsg_get_u32(c);
 674
 675         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 676                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 677                 if (ra_reachabletime > 3600000)
 678                         goto err;
 679
 680                 iface->ra_reachabletime = ra_reachabletime;
 681         }
 682
 683         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 684                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 685                 if (ra_retranstime > 60000)
 686                         goto err;
 687
 688                 iface->ra_retranstime = ra_retranstime;
 689         }
 690
 691         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 692                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 693                 if (ra_hoplimit > 255)
 694                         goto err;
 695
 696                 iface->ra_hoplimit = ra_hoplimit;
 697         }
 698
 699         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 700                 uint32_t ra_mtu = blobmsg_get_u32(c);
 701                 if (ra_mtu < 1280 || ra_mtu > 65535)
 702                         goto err;
 703
 704                 iface->ra_mtu = ra_mtu;
 705         }
 706
 707         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 708                 iface->ra_not_onlink = blobmsg_get_bool(c);
 709
 710         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 711                 iface->ra_advrouter = blobmsg_get_bool(c);
 712
 713         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 714                 iface->ra_mininterval =  blobmsg_get_u32(c);
 715
 716         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 717                 iface->ra_maxinterval = blobmsg_get_u32(c);
 718
 719         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 720                 iface->ra_lifetime = blobmsg_get_u32(c);
 721
 722         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 723                 iface->ra_useleasetime = blobmsg_get_bool(c);
 724
 725         if ((c = tb[IFACE_ATTR_RA_DNS]))
 726                 iface->ra_dns = blobmsg_get_bool(c);
 727
 728         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 729                 const char *prio = blobmsg_get_string(c);
 730
 731                 if (!strcmp(prio, "high"))
 732                         iface->route_preference = 1;
 733                 else if (!strcmp(prio, "low"))
 734                         iface->route_preference = -1;
 735                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 736                         iface->route_preference = 0;
 737                 else
 738                         goto err;
 739         }
 740
 741         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 742                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 743                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 744
 745         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 746                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 747                 goto err;
 748
 749         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 750                 iface->learn_routes = blobmsg_get_bool(c);
 751
 752         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 753                 iface->external = blobmsg_get_bool(c);
 754
 755         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 756                 const char *str = blobmsg_get_string(c);
 757                 char *astr = malloc(strlen(str) + 1);
 758                 char *delim;
 759                 int l;
 760
 761                 if (!astr || !strcpy(astr, str) ||
 762                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 763                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 764                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 765                         iface->pio_filter_length = 0;
 766                 else
 767                         iface->pio_filter_length = l;
 768
 769                 if (astr)
 770                         free(astr);
 771         }
 772
 773         return 0;
 774
 775 err:
 776         close_interface(iface);
 777         return -1;
 778 }
 779
 780 static int set_interface(struct uci_section *s)
 781 {
 782         blob_buf_init(&b, 0);
 783         uci_to_blob(&b, s, &interface_attr_list);
 784
 785         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 786 }
 787
 788 static void lease_delete_assignments(struct lease *l, bool v6)
 789 {
 790         struct dhcp_assignment *a, *tmp;
 791         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 792
 793         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 794                 if (a->flags & flag)
 795                         free_assignment(a);
 796         }
 797 }
 798
 799 static void lease_update_assignments(struct lease *l)
 800 {
 801         struct dhcp_assignment *a;
 802
 803         list_for_each_entry(a, &l->assignments, lease_list) {
 804                 if (a->hostname)
 805                         free(a->hostname);
 806                 a->hostname = NULL;
 807
 808                 if (l->hostname)
 809                         a->hostname = strdup(l->hostname);
 810
 811                 a->leasetime = l->leasetime;
 812         }
 813 }
 814
 815 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 816 {
 817         const struct lease *l1 = k1, *l2 = k2;
 818         int cmp = 0;
 819
 820         if (l1->duid_len != l2->duid_len)
 821                 return l1->duid_len - l2->duid_len;
 822
 823         if (l1->duid_len && l2->duid_len)
 824                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 825
 826         if (cmp)
 827                 return cmp;
 828
 829         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 830                       sizeof(l1->mac.ether_addr_octet));
 831 }
 832
 833 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 834 {
 835         bool update = false;
 836
 837         if ((!!l_new->hostname != !!l_old->hostname) ||
 838             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 839                 free(l_old->hostname);
 840                 l_old->hostname = NULL;
 841
 842                 if (l_new->hostname)
 843                         l_old->hostname = strdup(l_new->hostname);
 844
 845                 update = true;
 846         }
 847
 848         if (l_old->leasetime != l_new->leasetime) {
 849                 l_old->leasetime = l_new->leasetime;
 850                 update = true;
 851         }
 852
 853         if (l_old->ipaddr != l_new->ipaddr) {
 854                 l_old->ipaddr = l_new->ipaddr;
 855                 lease_delete_assignments(l_old, false);
 856         }
 857
 858         if (l_old->hostid != l_new->hostid) {
 859                 l_old->hostid = l_new->hostid;
 860                 lease_delete_assignments(l_old, true);
 861         }
 862
 863         if (update)
 864                 lease_update_assignments(l_old);
 865
 866         free_lease(l_new);
 867 }
 868
 869 static void lease_delete(struct lease *l)
 870 {
 871         struct dhcp_assignment *a;
 872
 873         list_for_each_entry(a, &l->assignments, lease_list)
 874                 free_assignment(a);
 875
 876         free_lease(l);
 877 }
 878
 879 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 880                          struct vlist_node *node_old)
 881 {
 882         struct lease *lease_new = container_of(node_new, struct lease, node);
 883         struct lease *lease_old = container_of(node_old, struct lease, node);
 884
 885         if (node_old && node_new)
 886                 lease_change_config(lease_old, lease_new);
 887         else if (node_old)
 888                 lease_delete(lease_old);
 889 }
 890
 891 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 892 {
 893         struct lease *l;
 894
 895         vlist_for_each_element(&leases, l, node) {
 896                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 897                         return l;
 898         }
 899
 900         return NULL;
 901 }
 902
 903 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 904 {
 905         struct lease *l;
 906
 907         vlist_for_each_element(&leases, l, node) {
 908                 if (!memcmp(l->mac.ether_addr_octet, mac,
 909                             sizeof(l->mac.ether_addr_octet)))
 910                         return l;
 911         }
 912
 913         return NULL;
 914 }
 915
 916 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
 917 {
 918         struct lease *l;
 919
 920         vlist_for_each_element(&leases, l, node) {
 921                 if (l->hostid == hostid)
 922                         return l;
 923         }
 924
 925         return NULL;
 926 }
 927
 928 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
 929 {
 930         struct lease *l;
 931
 932         vlist_for_each_element(&leases, l, node) {
 933                 if (l->ipaddr == ipaddr)
 934                         return l;
 935         }
 936
 937         return NULL;
 938 }
 939
 940 void odhcpd_reload(void)
 941 {
 942         struct uci_context *uci = uci_alloc_context();
 943         struct interface *master = NULL, *i, *tmp;
 944
 945         if (!uci)
 946                 return;
 947
 948         vlist_update(&leases);
 949         avl_for_each_element(&interfaces, i, avl)
 950                 clean_interface(i);
 951
 952         struct uci_package *dhcp = NULL;
 953         if (!uci_load(uci, "dhcp", &dhcp)) {
 954                 struct uci_element *e;
 955                 uci_foreach_element(&dhcp->sections, e) {
 956                         struct uci_section *s = uci_to_section(e);
 957                         if (!strcmp(s->type, "host"))
 958                                 set_lease(s);
 959                         else if (!strcmp(s->type, "odhcpd"))
 960                                 set_config(s);
 961                 }
 962
 963                 uci_foreach_element(&dhcp->sections, e) {
 964                         struct uci_section *s = uci_to_section(e);
 965                         if (!strcmp(s->type, "dhcp"))
 966                                 set_interface(s);
 967                 }
 968         }
 969
 970         if (config.dhcp_statefile) {
 971                 char *path = strdup(config.dhcp_statefile);
 972
 973                 mkdir_p(dirname(path), 0755);
 974                 free(path);
 975         }
 976
 977         vlist_flush(&leases);
 978
 979 #ifdef WITH_UBUS
 980         ubus_apply_network();
 981 #endif
 982
 983         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 984
 985         /* Test for */
 986         avl_for_each_element(&interfaces, i, avl) {
 987                 if (i->master)
 988                         continue;
 989
 990                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 991                         any_dhcpv6_slave = true;
 992
 993                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 994                         any_ra_slave = true;
 995
 996                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 997                         any_ndp_slave = true;
 998         }
 999
1000         /* Evaluate hybrid mode for master */
1001         avl_for_each_element(&interfaces, i, avl) {
1002                 if (!i->master)
1003                         continue;
1004
1005                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1006 #ifdef WITH_UBUS
1007                 if (!ubus_has_prefix(i->name, i->ifname))
1008                         hybrid_mode = MODE_RELAY;
1009 #endif
1010
1011                 if (i->dhcpv6 == MODE_HYBRID)
1012                         i->dhcpv6 = hybrid_mode;
1013
1014                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1015                         i->dhcpv6 = MODE_DISABLED;
1016
1017                 if (i->ra == MODE_HYBRID)
1018                         i->ra = hybrid_mode;
1019
1020                 if (i->ra == MODE_RELAY && !any_ra_slave)
1021                         i->ra = MODE_DISABLED;
1022
1023                 if (i->ndp == MODE_HYBRID)
1024                         i->ndp = hybrid_mode;
1025
1026                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1027                         i->ndp = MODE_DISABLED;
1028
1029                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1030                         master = i;
1031         }
1032
1033
1034         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1035                 if (i->inuse) {
1036                         /* Resolve hybrid mode */
1037                         if (i->dhcpv6 == MODE_HYBRID)
1038                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1039                                                 MODE_RELAY : MODE_SERVER;
1040
1041                         if (i->ra == MODE_HYBRID)
1042                                 i->ra = (master && master->ra == MODE_RELAY) ?
1043                                                 MODE_RELAY : MODE_SERVER;
1044
1045                         if (i->ndp == MODE_HYBRID)
1046                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1047                                                 MODE_RELAY : MODE_DISABLED;
1048
1049                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
1050                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
1051                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
1052 #ifdef DHCPV4_SUPPORT
1053                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
1054 #endif
1055                 } else
1056                         close_interface(i);
1057         }
1058
1059         uci_unload(uci, dhcp);
1060         uci_free_context(uci);
1061 }
1062
1063 static void handle_signal(int signal)
1064 {
1065         char b[1] = {0};
1066
1067         if (signal == SIGHUP) {
1068                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1069         } else
1070                 uloop_end();
1071 }
1072
1073 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1074 {
1075         char b[512];
1076         if (read(u->fd, b, sizeof(b)) < 0) {}
1077
1078         odhcpd_reload();
1079 }
1080
1081 static struct uloop_fd reload_fd = { .cb = reload_cb };
1082
1083 void odhcpd_run(void)
1084 {
1085         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1086
1087         reload_fd.fd = reload_pipe[0];
1088         uloop_fd_add(&reload_fd, ULOOP_READ);
1089
1090         signal(SIGTERM, handle_signal);
1091         signal(SIGINT, handle_signal);
1092         signal(SIGHUP, handle_signal);
1093
1094 #ifdef WITH_UBUS
1095         while (ubus_init())
1096                 sleep(1);
1097 #endif
1098
1099         odhcpd_reload();
1100         uloop_run();
1101 }